*/
#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.101 2000-01-29 21:01:27 fenner Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.191 2003-05-02 08:37:43 guy Exp $ (LBL)";
#endif
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef WIN32
+#include <pcap-stdinc.h>
+#else /* WIN32 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
-#ifdef __NetBSD__
-#include <sys/param.h>
-#endif
+#endif /* WIN32 */
-#if __STDC__
-struct mbuf;
-struct rtentry;
+/*
+ * XXX - why was this included even on UNIX?
+ */
+#ifdef __MINGW32__
+#include "IP6_misc.h"
#endif
-#include <net/if.h>
+#ifndef WIN32
+
+#ifdef __NetBSD__
+#include <sys/param.h>
+#endif
#include <netinet/in.h>
-#include <netinet/if_ether.h>
+
+#endif /* WIN32 */
#include <stdlib.h>
+#include <string.h>
#include <memory.h>
#include <setjmp.h>
-#if __STDC__
#include <stdarg.h>
-#else
-#include <varargs.h>
-#endif
#include "pcap-int.h"
#include "ethertype.h"
+#include "nlpid.h"
+#include "llc.h"
#include "gencode.h"
+#include "atmuni31.h"
+#include "sunatmpos.h"
#include "ppp.h"
-#include <pcap-namedb.h>
+#include "sll.h"
+#include "arcnet.h"
+#include "pf.h"
#ifdef INET6
-#include <netdb.h>
-#include <sys/socket.h>
+#ifndef WIN32
+#include <netdb.h> /* for "struct addrinfo" */
+#endif /* WIN32 */
#endif /*INET6*/
+#include <pcap-namedb.h>
+
+#define ETHERMTU 1500
+
+#ifndef IPPROTO_SCTP
+#define IPPROTO_SCTP 132
+#endif
-#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
static jmp_buf top_ctx;
static pcap_t *bpf_pcap;
+/* Hack for updating VLAN offsets. */
+static u_int orig_linktype = -1, orig_nl = -1, orig_nl_nosnap = -1;
+
/* XXX */
#ifdef PCAP_FDDIPAD
int pcap_fddipad = PCAP_FDDIPAD;
#endif
/* VARARGS */
-__dead void
-#if __STDC__
+void
bpf_error(const char *fmt, ...)
-#else
-bpf_error(fmt, va_alist)
- const char *fmt;
- va_dcl
-#endif
+
{
va_list ap;
-#if __STDC__
va_start(ap, fmt);
-#else
- va_start(ap);
-#endif
if (bpf_pcap != NULL)
- (void)vsprintf(pcap_geterr(bpf_pcap), fmt, ap);
+ (void)vsnprintf(pcap_geterr(bpf_pcap), PCAP_ERRBUF_SIZE,
+ fmt, ap);
va_end(ap);
longjmp(top_ctx, 1);
/* NOTREACHED */
static void backpatch(struct block *, struct block *);
static void merge(struct block *, struct block *);
static struct block *gen_cmp(u_int, u_int, bpf_int32);
+static struct block *gen_cmp_gt(u_int, u_int, bpf_int32);
static struct block *gen_mcmp(u_int, u_int, bpf_int32, bpf_u_int32);
static struct block *gen_bcmp(u_int, u_int, const u_char *);
+static struct block *gen_ncmp(bpf_u_int32, bpf_u_int32, bpf_u_int32,
+ bpf_u_int32, bpf_u_int32, int);
static struct block *gen_uncond(int);
static inline struct block *gen_true(void);
static inline struct block *gen_false(void);
+static struct block *gen_ether_linktype(int);
static struct block *gen_linktype(int);
+static struct block *gen_snap(bpf_u_int32, bpf_u_int32, u_int);
+static struct block *gen_llc(int);
static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int);
#ifdef INET6
static struct block *gen_hostop6(struct in6_addr *, struct in6_addr *, int, int, u_int, u_int);
#endif
+static struct block *gen_ahostop(const u_char *, int);
static struct block *gen_ehostop(const u_char *, int);
static struct block *gen_fhostop(const u_char *, int);
+static struct block *gen_thostop(const u_char *, int);
+static struct block *gen_wlanhostop(const u_char *, int);
+static struct block *gen_ipfchostop(const u_char *, int);
static struct block *gen_dnhostop(bpf_u_int32, int, u_int);
static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int);
#ifdef INET6
static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, int);
#endif
+#ifndef INET6
static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int);
+#endif
static struct block *gen_ipfrag(void);
static struct block *gen_portatom(int, bpf_int32);
#ifdef INET6
static struct block *gen_port6(int, int, int);
#endif
static int lookup_proto(const char *, int);
+static struct block *gen_protochain(int, int, int);
static struct block *gen_proto(int, int, int);
static struct slist *xfer_to_x(struct arth *);
static struct slist *xfer_to_a(struct arth *);
+static struct block *gen_mac_multicast(int);
static struct block *gen_len(int, int);
+static struct block *gen_msg_abbrev(int type);
+
static void *
newchunk(n)
u_int n;
bpf_error("out of memory");
size = CHUNK0SIZE << k;
cp->m = (void *)malloc(size);
+ if (cp->m == NULL)
+ bpf_error("out of memory");
memset((char *)cp->m, 0, size);
cp->n_left = size;
if (n > size)
int n = strlen(s) + 1;
char *cp = newchunk(n);
- strcpy(cp, s);
+ strlcpy(cp, s, n);
return (cp);
}
root = NULL;
bpf_pcap = p;
if (setjmp(top_ctx)) {
+ lex_cleanup();
freechunks();
return (-1);
}
netmask = mask;
+
snaplen = pcap_snapshot(p);
+ if (snaplen == 0) {
+ snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
+ "snaplen of 0 rejects all packets");
+ return -1;
+ }
lex_init(buf ? buf : "");
init_linktype(pcap_datalink(p));
program->bf_insns = icode_to_fcode(root, &len);
program->bf_len = len;
+ lex_cleanup();
freechunks();
return (0);
}
struct bpf_program *program,
char *buf, int optimize, bpf_u_int32 mask)
{
- extern int n_errors;
- int len;
+ pcap_t *p;
+ int ret;
- n_errors = 0;
- root = NULL;
- bpf_pcap = NULL;
- if (setjmp(top_ctx)) {
- freechunks();
+ p = pcap_open_dead(linktype_arg, snaplen_arg);
+ if (p == NULL)
return (-1);
- }
-
- netmask = mask;
-
- /* XXX needed? I don't grok the use of globals here. */
- snaplen = snaplen_arg;
-
- lex_init(buf ? buf : "");
- init_linktype(linktype_arg);
- (void)pcap_parse();
-
- if (n_errors)
- syntax();
-
- if (root == NULL)
- root = gen_retblk(snaplen_arg);
+ ret = pcap_compile(p, program, buf, optimize, mask);
+ pcap_close(p);
+ return (ret);
+}
- if (optimize) {
- bpf_optimize(&root);
- if (root == NULL ||
- (root->s.code == (BPF_RET|BPF_K) && root->s.k == 0))
- bpf_error("expression rejects all packets");
+/*
+ * Clean up a "struct bpf_program" by freeing all the memory allocated
+ * in it.
+ */
+void
+pcap_freecode(struct bpf_program *program)
+{
+ program->bf_len = 0;
+ if (program->bf_insns != NULL) {
+ free((char *)program->bf_insns);
+ program->bf_insns = NULL;
}
- program->bf_insns = icode_to_fcode(root, &len);
- program->bf_len = len;
-
- freechunks();
- return (0);
}
/*
return b;
}
+static struct block *
+gen_cmp_gt(offset, size, v)
+ u_int offset, size;
+ bpf_int32 v;
+{
+ struct slist *s;
+ struct block *b;
+
+ s = new_stmt(BPF_LD|BPF_ABS|size);
+ s->s.k = offset;
+
+ b = new_block(JMP(BPF_JGT));
+ b->stmts = s;
+ b->s.k = v;
+
+ return b;
+}
+
static struct block *
gen_mcmp(offset, size, v, mask)
u_int offset, size;
return b;
}
+static struct block *
+gen_ncmp(datasize, offset, mask, jtype, jvalue, reverse)
+ bpf_u_int32 datasize, offset, mask, jtype, jvalue;
+ int reverse;
+{
+ struct slist *s;
+ struct block *b;
+
+ s = new_stmt(BPF_LD|datasize|BPF_ABS);
+ s->s.k = offset;
+
+ if (mask != 0xffffffff) {
+ s->next = new_stmt(BPF_ALU|BPF_AND|BPF_K);
+ s->next->s.k = mask;
+ }
+
+ b = new_block(JMP(jtype));
+ b->stmts = s;
+ b->s.k = jvalue;
+ if (reverse && (jtype == BPF_JGT || jtype == BPF_JGE))
+ gen_not(b);
+ return b;
+}
+
/*
* Various code constructs need to know the layout of the data link
- * layer. These variables give the necessary offsets. off_linktype
- * is set to -1 for no encapsulation, in which case, IP is assumed.
+ * layer. These variables give the necessary offsets.
+ */
+
+/*
+ * This is the offset of the beginning of the MAC-layer header.
+ * It's usually 0, except for ATM LANE.
+ */
+static u_int off_mac;
+
+/*
+ * "off_linktype" is the offset to information in the link-layer header
+ * giving the packet type.
+ *
+ * For Ethernet, it's the offset of the Ethernet type field.
+ *
+ * For link-layer types that always use 802.2 headers, it's the
+ * offset of the LLC header.
+ *
+ * For PPP, it's the offset of the PPP type field.
+ *
+ * For Cisco HDLC, it's the offset of the CHDLC type field.
+ *
+ * For BSD loopback, it's the offset of the AF_ value.
+ *
+ * For Linux cooked sockets, it's the offset of the type field.
+ *
+ * It's set to -1 for no encapsulation, in which case, IP is assumed.
*/
static u_int off_linktype;
+
+/*
+ * TRUE if the link layer includes an ATM pseudo-header.
+ */
+static int is_atm = 0;
+
+/*
+ * TRUE if "lane" appeared in the filter; it causes us to generate
+ * code that assumes LANE rather than LLC-encapsulated traffic in SunATM.
+ */
+static int is_lane = 0;
+
+/*
+ * These are offsets for the ATM pseudo-header.
+ */
+static u_int off_vpi;
+static u_int off_vci;
+static u_int off_proto;
+
+/*
+ * This is the offset of the first byte after the ATM pseudo_header,
+ * or -1 if there is no ATM pseudo-header.
+ */
+static u_int off_payload;
+
+/*
+ * These are offsets to the beginning of the network-layer header.
+ *
+ * If the link layer never uses 802.2 LLC:
+ *
+ * "off_nl" and "off_nl_nosnap" are the same.
+ *
+ * If the link layer always uses 802.2 LLC:
+ *
+ * "off_nl" is the offset if there's a SNAP header following
+ * the 802.2 header;
+ *
+ * "off_nl_nosnap" is the offset if there's no SNAP header.
+ *
+ * If the link layer is Ethernet:
+ *
+ * "off_nl" is the offset if the packet is an Ethernet II packet
+ * (we assume no 802.3+802.2+SNAP);
+ *
+ * "off_nl_nosnap" is the offset if the packet is an 802.3 packet
+ * with an 802.2 header following it.
+ */
static u_int off_nl;
+static u_int off_nl_nosnap;
+
static int linktype;
static void
{
linktype = type;
+ /*
+ * Assume it's not raw ATM with a pseudo-header, for now.
+ */
+ off_mac = 0;
+ is_atm = 0;
+ is_lane = 0;
+ off_vpi = -1;
+ off_vci = -1;
+ off_proto = -1;
+ off_payload = -1;
+
+ orig_linktype = -1;
+ orig_nl = -1;
+ orig_nl_nosnap = -1;
+
switch (type) {
+ case DLT_ARCNET:
+ off_linktype = 2;
+ off_nl = 6; /* XXX in reality, variable! */
+ off_nl_nosnap = 6; /* no 802.2 LLC */
+ return;
+
+ case DLT_ARCNET_LINUX:
+ off_linktype = 4;
+ off_nl = 8; /* XXX in reality, variable! */
+ off_nl_nosnap = 8; /* no 802.2 LLC */
+ return;
+
case DLT_EN10MB:
off_linktype = 12;
- off_nl = 14;
+ off_nl = 14; /* Ethernet II */
+ off_nl_nosnap = 17; /* 802.3+802.2 */
return;
case DLT_SLIP:
*/
off_linktype = -1;
off_nl = 16;
+ off_nl_nosnap = 16; /* no 802.2 LLC */
return;
case DLT_SLIP_BSDOS:
off_linktype = -1;
/* XXX end */
off_nl = 24;
+ off_nl_nosnap = 24; /* no 802.2 LLC */
return;
case DLT_NULL:
+ case DLT_LOOP:
off_linktype = 0;
off_nl = 4;
+ off_nl_nosnap = 4; /* no 802.2 LLC */
+ return;
+
+ case DLT_ENC:
+ off_linktype = 0;
+ off_nl = 12;
+ off_nl_nosnap = 12; /* no 802.2 LLC */
+ return;
+
+ case DLT_PFLOG:
+ off_linktype = 0;
+ off_nl = 28;
+ off_nl_nosnap = 28; /* no 802.2 LLC */
return;
case DLT_PPP:
- case DLT_CHDLC:
+ case DLT_C_HDLC: /* BSD/OS Cisco HDLC */
+ case DLT_PPP_SERIAL: /* NetBSD sync/async serial PPP */
off_linktype = 2;
off_nl = 4;
+ off_nl_nosnap = 4; /* no 802.2 LLC */
+ return;
+
+ case DLT_PPP_ETHER:
+ /*
+ * This does no include the Ethernet header, and
+ * only covers session state.
+ */
+ off_linktype = 6;
+ off_nl = 8;
+ off_nl_nosnap = 8; /* no 802.2 LLC */
return;
case DLT_PPP_BSDOS:
off_linktype = 5;
off_nl = 24;
+ off_nl_nosnap = 24; /* no 802.2 LLC */
return;
case DLT_FDDI:
/*
* FDDI doesn't really have a link-level type field.
- * We assume that SSAP = SNAP is being used and pick
- * out the encapsulated Ethernet type.
+ * We set "off_linktype" to the offset of the LLC header.
+ *
+ * To check for Ethernet types, we assume that SSAP = SNAP
+ * is being used and pick out the encapsulated Ethernet type.
+ * XXX - should we generate code to check for SNAP?
*/
- off_linktype = 19;
+ off_linktype = 13;
#ifdef PCAP_FDDIPAD
off_linktype += pcap_fddipad;
#endif
- off_nl = 21;
+ off_nl = 21; /* FDDI+802.2+SNAP */
+ off_nl_nosnap = 16; /* FDDI+802.2 */
#ifdef PCAP_FDDIPAD
off_nl += pcap_fddipad;
+ off_nl_nosnap += pcap_fddipad;
#endif
return;
case DLT_IEEE802:
- off_linktype = 20;
- off_nl = 22;
+ /*
+ * Token Ring doesn't really have a link-level type field.
+ * We set "off_linktype" to the offset of the LLC header.
+ *
+ * To check for Ethernet types, we assume that SSAP = SNAP
+ * is being used and pick out the encapsulated Ethernet type.
+ * XXX - should we generate code to check for SNAP?
+ *
+ * XXX - the header is actually variable-length.
+ * Some various Linux patched versions gave 38
+ * as "off_linktype" and 40 as "off_nl"; however,
+ * if a token ring packet has *no* routing
+ * information, i.e. is not source-routed, the correct
+ * values are 20 and 22, as they are in the vanilla code.
+ *
+ * A packet is source-routed iff the uppermost bit
+ * of the first byte of the source address, at an
+ * offset of 8, has the uppermost bit set. If the
+ * packet is source-routed, the total number of bytes
+ * of routing information is 2 plus bits 0x1F00 of
+ * the 16-bit value at an offset of 14 (shifted right
+ * 8 - figure out which byte that is).
+ */
+ off_linktype = 14;
+ off_nl = 22; /* Token Ring+802.2+SNAP */
+ off_nl_nosnap = 17; /* Token Ring+802.2 */
+ return;
+
+ case DLT_IEEE802_11:
+ /*
+ * 802.11 doesn't really have a link-level type field.
+ * We set "off_linktype" to the offset of the LLC header.
+ *
+ * To check for Ethernet types, we assume that SSAP = SNAP
+ * is being used and pick out the encapsulated Ethernet type.
+ * XXX - should we generate code to check for SNAP?
+ *
+ * XXX - the header is actually variable-length. We
+ * assume a 24-byte link-layer header, as appears in
+ * data frames in networks with no bridges.
+ */
+ off_linktype = 24;
+ off_nl = 32; /* 802.11+802.2+SNAP */
+ off_nl_nosnap = 27; /* 802.11+802.2 */
+ return;
+
+ case DLT_PRISM_HEADER:
+ /*
+ * Same as 802.11, but with an additional header before
+ * the 802.11 header, containing a bunch of additional
+ * information including radio-level information.
+ *
+ * The header is 144 bytes long.
+ *
+ * XXX - same variable-length header problem; at least
+ * the Prism header is fixed-length.
+ */
+ off_linktype = 144+24;
+ off_nl = 144+32; /* Prism+802.11+802.2+SNAP */
+ off_nl_nosnap = 144+27; /* Prism+802.11+802.2 */
+ return;
+
+ case DLT_IEEE802_11_RADIO:
+ /*
+ * Same as 802.11, but with an additional header before
+ * the 802.11 header, containing a bunch of additional
+ * information including radio-level information.
+ *
+ * The header is 64 bytes long.
+ *
+ * XXX - same variable-length header problem, only
+ * more so; this header is also variable-length,
+ * with the length being the 32-bit big-endian
+ * number at an offset of 4 from the beginning
+ * of the radio header.
+ */
+ off_linktype = 64+24;
+ off_nl = 64+32; /* Radio+802.11+802.2+SNAP */
+ off_nl_nosnap = 64+27; /* Radio+802.11+802.2 */
return;
case DLT_ATM_RFC1483:
+ case DLT_ATM_CLIP: /* Linux ATM defines this */
/*
* assume routed, non-ISO PDUs
* (i.e., LLC = 0xAA-AA-03, OUT = 0x00-00-00)
*/
- off_linktype = 6;
- off_nl = 8;
+ off_linktype = 0;
+ off_nl = 8; /* 802.2+SNAP */
+ off_nl_nosnap = 3; /* 802.2 */
+ return;
+
+ case DLT_SUNATM:
+ /*
+ * Full Frontal ATM; you get AALn PDUs with an ATM
+ * pseudo-header.
+ */
+ is_atm = 1;
+ off_vpi = SUNATM_VPI_POS;
+ off_vci = SUNATM_VCI_POS;
+ off_proto = PROTO_POS;
+ off_mac = -1; /* LLC-encapsulated, so no MAC-layer header */
+ off_payload = SUNATM_PKT_BEGIN_POS;
+ off_linktype = off_payload;
+ off_nl = off_payload+8; /* 802.2+SNAP */
+ off_nl_nosnap = off_payload+3; /* 802.2 */
return;
case DLT_RAW:
off_linktype = -1;
off_nl = 0;
+ off_nl_nosnap = 0; /* no 802.2 LLC */
+ return;
+
+ case DLT_LINUX_SLL: /* fake header for Linux cooked socket */
+ off_linktype = 14;
+ off_nl = 16;
+ off_nl_nosnap = 16; /* no 802.2 LLC */
+ return;
+
+ case DLT_LTALK:
+ /*
+ * LocalTalk does have a 1-byte type field in the LLAP header,
+ * but really it just indicates whether there is a "short" or
+ * "long" DDP packet following.
+ */
+ off_linktype = -1;
+ off_nl = 0;
+ off_nl_nosnap = 0; /* no 802.2 LLC */
+ return;
+
+ case DLT_IP_OVER_FC:
+ /*
+ * RFC 2625 IP-over-Fibre-Channel doesn't really have a
+ * link-level type field. We set "off_linktype" to the
+ * offset of the LLC header.
+ *
+ * To check for Ethernet types, we assume that SSAP = SNAP
+ * is being used and pick out the encapsulated Ethernet type.
+ * XXX - should we generate code to check for SNAP? RFC
+ * 2625 says SNAP should be used.
+ */
+ off_linktype = 16;
+ off_nl = 24; /* IPFC+802.2+SNAP */
+ off_nl_nosnap = 19; /* IPFC+802.2 */
+ return;
+
+ case DLT_FRELAY:
+ /*
+ * XXX - we should set this to handle SNAP-encapsulated
+ * frames (NLPID of 0x80).
+ */
+ off_linktype = -1;
+ off_nl = 0;
+ off_nl_nosnap = 0; /* no 802.2 LLC */
return;
}
- bpf_error("unknown data link type 0x%x", linktype);
+ bpf_error("unknown data link type %d", linktype);
/* NOTREACHED */
}
return gen_uncond(0);
}
+/*
+ * Byte-swap a 32-bit number.
+ * ("htonl()" or "ntohl()" won't work - we want to byte-swap even on
+ * big-endian platforms.)
+ */
+#define SWAPLONG(y) \
+((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
+
static struct block *
-gen_linktype(proto)
+gen_ether_linktype(proto)
register int proto;
{
struct block *b0, *b1;
- /* If we're not using encapsulation and checking for IP, we're done */
- if (off_linktype == -1 && proto == ETHERTYPE_IP)
- return gen_true();
+ switch (proto) {
- switch (linktype) {
+ case LLCSAP_ISONS:
+ /*
+ * OSI protocols always use 802.2 encapsulation.
+ * XXX - should we check both the DSAP and the
+ * SSAP, like this, or should we check just the
+ * DSAP?
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
+ gen_and(b0, b1);
+ return b1;
- case DLT_SLIP:
- return gen_false();
+ case LLCSAP_IP:
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_IP << 8) | LLCSAP_IP));
+ gen_and(b0, b1);
+ return b1;
- case DLT_PPP:
- if (proto == ETHERTYPE_IP)
- proto = PPP_IP; /* XXX was 0x21 */
-#ifdef INET6
- else if (proto == ETHERTYPE_IPV6)
- proto = PPP_IPV6;
-#endif
- break;
+ case LLCSAP_NETBEUI:
+ /*
+ * NetBEUI always uses 802.2 encapsulation.
+ * XXX - should we check both the DSAP and the
+ * SSAP, like this, or should we check just the
+ * DSAP?
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+ gen_and(b0, b1);
+ return b1;
- case DLT_PPP_BSDOS:
- switch (proto) {
+ case LLCSAP_IPX:
+ /*
+ * Check for;
+ *
+ * Ethernet_II frames, which are Ethernet
+ * frames with a frame type of ETHERTYPE_IPX;
+ *
+ * Ethernet_802.3 frames, which are 802.3
+ * frames (i.e., the type/length field is
+ * a length field, <= ETHERMTU, rather than
+ * a type field) with the first two bytes
+ * after the Ethernet/802.3 header being
+ * 0xFFFF;
+ *
+ * Ethernet_802.2 frames, which are 802.3
+ * frames with an 802.2 LLC header and
+ * with the IPX LSAP as the DSAP in the LLC
+ * header;
+ *
+ * Ethernet_SNAP frames, which are 802.3
+ * frames with an LLC header and a SNAP
+ * header and with an OUI of 0x000000
+ * (encapsulated Ethernet) and a protocol
+ * ID of ETHERTYPE_IPX in the SNAP header.
+ *
+ * XXX - should we generate the same code both
+ * for tests for LLCSAP_IPX and for ETHERTYPE_IPX?
+ */
- case ETHERTYPE_IP:
- b0 = gen_cmp(off_linktype, BPF_H, PPP_IP);
- b1 = gen_cmp(off_linktype, BPF_H, PPP_VJC);
- gen_or(b0, b1);
- b0 = gen_cmp(off_linktype, BPF_H, PPP_VJNC);
- gen_or(b1, b0);
- return b0;
+ /*
+ * This generates code to check both for the
+ * IPX LSAP (Ethernet_802.2) and for Ethernet_802.3.
+ */
+ b0 = gen_cmp(off_linktype + 2, BPF_B, (bpf_int32)LLCSAP_IPX);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)0xFFFF);
+ gen_or(b0, b1);
-#ifdef INET6
- case ETHERTYPE_IPV6:
- proto = PPP_IPV6;
- /* more to go? */
- break;
-#endif
+ /*
+ * Now we add code to check for SNAP frames with
+ * ETHERTYPE_IPX, i.e. Ethernet_SNAP.
+ */
+ b0 = gen_snap(0x000000, ETHERTYPE_IPX, 14);
+ gen_or(b0, b1);
- case ETHERTYPE_DN:
- proto = PPP_DECNET;
- break;
+ /*
+ * Now we generate code to check for 802.3
+ * frames in general.
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
- case ETHERTYPE_ATALK:
- proto = PPP_APPLE;
- break;
+ /*
+ * Now add the check for 802.3 frames before the
+ * check for Ethernet_802.2 and Ethernet_802.3,
+ * as those checks should only be done on 802.3
+ * frames, not on Ethernet frames.
+ */
+ gen_and(b0, b1);
- case ETHERTYPE_NS:
- proto = PPP_NS;
- break;
- }
- break;
+ /*
+ * Now add the check for Ethernet_II frames, and
+ * do that before checking for the other frame
+ * types.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)ETHERTYPE_IPX);
+ gen_or(b0, b1);
+ return b1;
- case DLT_NULL:
- /* XXX */
- if (proto == ETHERTYPE_IP)
- return (gen_cmp(0, BPF_W, (bpf_int32)htonl(AF_INET)));
-#ifdef INET6
- else if (proto == ETHERTYPE_IPV6)
- return (gen_cmp(0, BPF_W, (bpf_int32)htonl(AF_INET6)));
-#endif
- else
- return gen_false();
- }
- return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
-}
-
-static struct block *
-gen_hostop(addr, mask, dir, proto, src_off, dst_off)
- bpf_u_int32 addr;
- bpf_u_int32 mask;
- int dir, proto;
- u_int src_off, dst_off;
-{
- struct block *b0, *b1;
- u_int offset;
-
- switch (dir) {
-
- case Q_SRC:
- offset = src_off;
- break;
+ case ETHERTYPE_ATALK:
+ case ETHERTYPE_AARP:
+ /*
+ * EtherTalk (AppleTalk protocols on Ethernet link
+ * layer) may use 802.2 encapsulation.
+ */
- case Q_DST:
- offset = dst_off;
- break;
+ /*
+ * Check for 802.2 encapsulation (EtherTalk phase 2?);
+ * we check for an Ethernet type field less than
+ * 1500, which means it's an 802.3 length field.
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
- case Q_AND:
- b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
- b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
+ /*
+ * 802.2-encapsulated ETHERTYPE_ATALK packets are
+ * SNAP packets with an organization code of
+ * 0x080007 (Apple, for Appletalk) and a protocol
+ * type of ETHERTYPE_ATALK (Appletalk).
+ *
+ * 802.2-encapsulated ETHERTYPE_AARP packets are
+ * SNAP packets with an organization code of
+ * 0x000000 (encapsulated Ethernet) and a protocol
+ * type of ETHERTYPE_AARP (Appletalk ARP).
+ */
+ if (proto == ETHERTYPE_ATALK)
+ b1 = gen_snap(0x080007, ETHERTYPE_ATALK, 14);
+ else /* proto == ETHERTYPE_AARP */
+ b1 = gen_snap(0x000000, ETHERTYPE_AARP, 14);
gen_and(b0, b1);
- return b1;
- case Q_OR:
- case Q_DEFAULT:
- b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
- b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
+ /*
+ * Check for Ethernet encapsulation (Ethertalk
+ * phase 1?); we just check for the Ethernet
+ * protocol type.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+
gen_or(b0, b1);
return b1;
default:
- abort();
+ if (proto <= ETHERMTU) {
+ /*
+ * This is an LLC SAP value, so the frames
+ * that match would be 802.2 frames.
+ * Check that the frame is an 802.2 frame
+ * (i.e., that the length/type field is
+ * a length field, <= ETHERMTU) and
+ * then check the DSAP.
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_B, (bpf_int32)proto);
+ gen_and(b0, b1);
+ return b1;
+ } else {
+ /*
+ * This is an Ethernet type, so compare
+ * the length/type field with it (if
+ * the frame is an 802.2 frame, the length
+ * field will be <= ETHERMTU, and, as
+ * "proto" is > ETHERMTU, this test
+ * will fail and the frame won't match,
+ * which is what we want).
+ */
+ return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ }
}
- b0 = gen_linktype(proto);
- b1 = gen_mcmp(offset, BPF_W, (bpf_int32)addr, mask);
- gen_and(b0, b1);
- return b1;
}
-#ifdef INET6
static struct block *
-gen_hostop6(addr, mask, dir, proto, src_off, dst_off)
- struct in6_addr *addr;
- struct in6_addr *mask;
- int dir, proto;
- u_int src_off, dst_off;
+gen_linktype(proto)
+ register int proto;
{
- struct block *b0, *b1;
- u_int offset;
- u_int32_t *a, *m;
+ struct block *b0, *b1, *b2;
- switch (dir) {
+ switch (linktype) {
- case Q_SRC:
- offset = src_off;
+ case DLT_EN10MB:
+ return gen_ether_linktype(proto);
break;
- case Q_DST:
- offset = dst_off;
- break;
+ case DLT_C_HDLC:
+ switch (proto) {
- case Q_AND:
- b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
- b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
- gen_and(b0, b1);
- return b1;
+ case LLCSAP_ISONS:
+ proto = (proto << 8 | LLCSAP_ISONS);
+ /* fall through */
- case Q_OR:
- case Q_DEFAULT:
- b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
- b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
- gen_or(b0, b1);
- return b1;
+ default:
+ return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ break;
+ }
+ break;
- default:
- abort();
- }
- /* this order is important */
- a = (u_int32_t *)addr;
- m = (u_int32_t *)mask;
- b1 = gen_mcmp(offset + 12, BPF_W, ntohl(a[3]), ntohl(m[3]));
- b0 = gen_mcmp(offset + 8, BPF_W, ntohl(a[2]), ntohl(m[2]));
- gen_and(b0, b1);
- b0 = gen_mcmp(offset + 4, BPF_W, ntohl(a[1]), ntohl(m[1]));
- gen_and(b0, b1);
- b0 = gen_mcmp(offset + 0, BPF_W, ntohl(a[0]), ntohl(m[0]));
- gen_and(b0, b1);
- b0 = gen_linktype(proto);
- gen_and(b0, b1);
- return b1;
-}
-#endif /*INET6*/
+ case DLT_IEEE802_11:
+ case DLT_PRISM_HEADER:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_FDDI:
+ case DLT_IEEE802:
+ case DLT_ATM_RFC1483:
+ case DLT_ATM_CLIP:
+ case DLT_IP_OVER_FC:
+ return gen_llc(proto);
+ break;
-static struct block *
-gen_ehostop(eaddr, dir)
- register const u_char *eaddr;
- register int dir;
-{
- register struct block *b0, *b1;
+ case DLT_SUNATM:
+ /*
+ * If "is_lane" is set, check for a LANE-encapsulated
+ * version of this protocol, otherwise check for an
+ * LLC-encapsulated version of this protocol.
+ *
+ * We assume LANE means Ethernet, not Token Ring.
+ */
+ if (is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b0 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b0);
- switch (dir) {
- case Q_SRC:
- return gen_bcmp(6, 6, eaddr);
+ /*
+ * Now generate an Ethernet test.
+ */
+ b1 = gen_ether_linktype(proto);
+ gen_and(b0, b1);
+ return b1;
+ } else {
+ /*
+ * Check for LLC encapsulation and then check the
+ * protocol.
+ */
+ b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
+ b1 = gen_llc(proto);
+ gen_and(b0, b1);
+ return b1;
+ }
- case Q_DST:
- return gen_bcmp(0, 6, eaddr);
+ case DLT_LINUX_SLL:
+ switch (proto) {
- case Q_AND:
- b0 = gen_ehostop(eaddr, Q_SRC);
- b1 = gen_ehostop(eaddr, Q_DST);
- gen_and(b0, b1);
- return b1;
+ case LLCSAP_IP:
+ b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_IP << 8) | LLCSAP_IP));
+ gen_and(b0, b1);
+ return b1;
- case Q_DEFAULT:
- case Q_OR:
- b0 = gen_ehostop(eaddr, Q_SRC);
- b1 = gen_ehostop(eaddr, Q_DST);
- gen_or(b0, b1);
- return b1;
- }
- abort();
- /* NOTREACHED */
-}
+ case LLCSAP_ISONS:
+ /*
+ * OSI protocols always use 802.2 encapsulation.
+ * XXX - should we check both the DSAP and the
+ * LSAP, like this, or should we check just the
+ * DSAP?
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
+ gen_and(b0, b1);
+ return b1;
-/*
- * Like gen_ehostop, but for DLT_FDDI
- */
-static struct block *
-gen_fhostop(eaddr, dir)
- register const u_char *eaddr;
- register int dir;
-{
- struct block *b0, *b1;
+ case LLCSAP_NETBEUI:
+ /*
+ * NetBEUI always uses 802.2 encapsulation.
+ * XXX - should we check both the DSAP and the
+ * LSAP, like this, or should we check just the
+ * DSAP?
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+ gen_and(b0, b1);
+ return b1;
- switch (dir) {
- case Q_SRC:
-#ifdef PCAP_FDDIPAD
- return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr);
-#else
- return gen_bcmp(6 + 1, 6, eaddr);
-#endif
+ case LLCSAP_IPX:
+ /*
+ * Ethernet_II frames, which are Ethernet
+ * frames with a frame type of ETHERTYPE_IPX;
+ *
+ * Ethernet_802.3 frames, which have a frame
+ * type of LINUX_SLL_P_802_3;
+ *
+ * Ethernet_802.2 frames, which are 802.3
+ * frames with an 802.2 LLC header (i.e, have
+ * a frame type of LINUX_SLL_P_802_2) and
+ * with the IPX LSAP as the DSAP in the LLC
+ * header;
+ *
+ * Ethernet_SNAP frames, which are 802.3
+ * frames with an LLC header and a SNAP
+ * header and with an OUI of 0x000000
+ * (encapsulated Ethernet) and a protocol
+ * ID of ETHERTYPE_IPX in the SNAP header.
+ *
+ * First, do the checks on LINUX_SLL_P_802_2
+ * frames; generate the check for either
+ * Ethernet_802.2 or Ethernet_SNAP frames, and
+ * then put a check for LINUX_SLL_P_802_2 frames
+ * before it.
+ */
+ b0 = gen_cmp(off_linktype + 2, BPF_B,
+ (bpf_int32)LLCSAP_IPX);
+ b1 = gen_snap(0x000000, ETHERTYPE_IPX,
+ off_linktype + 2);
+ gen_or(b0, b1);
+ b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ gen_and(b0, b1);
- case Q_DST:
-#ifdef PCAP_FDDIPAD
- return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr);
-#else
- return gen_bcmp(0 + 1, 6, eaddr);
-#endif
+ /*
+ * Now check for 802.3 frames and OR that with
+ * the previous test.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_3);
+ gen_or(b0, b1);
- case Q_AND:
- b0 = gen_fhostop(eaddr, Q_SRC);
- b1 = gen_fhostop(eaddr, Q_DST);
- gen_and(b0, b1);
- return b1;
+ /*
+ * Now add the check for Ethernet_II frames, and
+ * do that before checking for the other frame
+ * types.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H,
+ (bpf_int32)ETHERTYPE_IPX);
+ gen_or(b0, b1);
+ return b1;
- case Q_DEFAULT:
- case Q_OR:
- b0 = gen_fhostop(eaddr, Q_SRC);
- b1 = gen_fhostop(eaddr, Q_DST);
- gen_or(b0, b1);
- return b1;
- }
- abort();
- /* NOTREACHED */
-}
+ case ETHERTYPE_ATALK:
+ case ETHERTYPE_AARP:
+ /*
+ * EtherTalk (AppleTalk protocols on Ethernet link
+ * layer) may use 802.2 encapsulation.
+ */
-/*
- * This is quite tricky because there may be pad bytes in front of the
- * DECNET header, and then there are two possible data packet formats that
- * carry both src and dst addresses, plus 5 packet types in a format that
- * carries only the src node, plus 2 types that use a different format and
- * also carry just the src node.
- *
- * Yuck.
- *
- * Instead of doing those all right, we just look for data packets with
- * 0 or 1 bytes of padding. If you want to look at other packets, that
- * will require a lot more hacking.
- *
- * To add support for filtering on DECNET "areas" (network numbers)
- * one would want to add a "mask" argument to this routine. That would
- * make the filter even more inefficient, although one could be clever
- * and not generate masking instructions if the mask is 0xFFFF.
- */
-static struct block *
-gen_dnhostop(addr, dir, base_off)
- bpf_u_int32 addr;
- int dir;
- u_int base_off;
-{
- struct block *b0, *b1, *b2, *tmp;
- u_int offset_lh; /* offset if long header is received */
- u_int offset_sh; /* offset if short header is received */
+ /*
+ * Check for 802.2 encapsulation (EtherTalk phase 2?);
+ * we check for the 802.2 protocol type in the
+ * "Ethernet type" field.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
- switch (dir) {
+ /*
+ * 802.2-encapsulated ETHERTYPE_ATALK packets are
+ * SNAP packets with an organization code of
+ * 0x080007 (Apple, for Appletalk) and a protocol
+ * type of ETHERTYPE_ATALK (Appletalk).
+ *
+ * 802.2-encapsulated ETHERTYPE_AARP packets are
+ * SNAP packets with an organization code of
+ * 0x000000 (encapsulated Ethernet) and a protocol
+ * type of ETHERTYPE_AARP (Appletalk ARP).
+ */
+ if (proto == ETHERTYPE_ATALK)
+ b1 = gen_snap(0x080007, ETHERTYPE_ATALK,
+ off_linktype + 2);
+ else /* proto == ETHERTYPE_AARP */
+ b1 = gen_snap(0x000000, ETHERTYPE_AARP,
+ off_linktype + 2);
+ gen_and(b0, b1);
- case Q_DST:
- offset_sh = 1; /* follows flags */
- offset_lh = 7; /* flgs,darea,dsubarea,HIORD */
- break;
+ /*
+ * Check for Ethernet encapsulation (Ethertalk
+ * phase 1?); we just check for the Ethernet
+ * protocol type.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
- case Q_SRC:
- offset_sh = 3; /* follows flags, dstnode */
- offset_lh = 15; /* flgs,darea,dsubarea,did,sarea,ssub,HIORD */
+ gen_or(b0, b1);
+ return b1;
+
+ default:
+ if (proto <= ETHERMTU) {
+ /*
+ * This is an LLC SAP value, so the frames
+ * that match would be 802.2 frames.
+ * Check for the 802.2 protocol type
+ * in the "Ethernet type" field, and
+ * then check the DSAP.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H,
+ LINUX_SLL_P_802_2);
+ b1 = gen_cmp(off_linktype + 2, BPF_B,
+ (bpf_int32)proto);
+ gen_and(b0, b1);
+ return b1;
+ } else {
+ /*
+ * This is an Ethernet type, so compare
+ * the length/type field with it (if
+ * the frame is an 802.2 frame, the length
+ * field will be <= ETHERMTU, and, as
+ * "proto" is > ETHERMTU, this test
+ * will fail and the frame won't match,
+ * which is what we want).
+ */
+ return gen_cmp(off_linktype, BPF_H,
+ (bpf_int32)proto);
+ }
+ }
break;
- case Q_AND:
- /* Inefficient because we do our Calvinball dance twice */
- b0 = gen_dnhostop(addr, Q_SRC, base_off);
- b1 = gen_dnhostop(addr, Q_DST, base_off);
- gen_and(b0, b1);
- return b1;
+ case DLT_SLIP:
+ case DLT_SLIP_BSDOS:
+ case DLT_RAW:
+ /*
+ * These types don't provide any type field; packets
+ * are always IP.
+ *
+ * XXX - for IPv4, check for a version number of 4, and,
+ * for IPv6, check for a version number of 6?
+ */
+ switch (proto) {
- case Q_OR:
- case Q_DEFAULT:
- /* Inefficient because we do our Calvinball dance twice */
- b0 = gen_dnhostop(addr, Q_SRC, base_off);
- b1 = gen_dnhostop(addr, Q_DST, base_off);
- gen_or(b0, b1);
- return b1;
+ case ETHERTYPE_IP:
+#ifdef INET6
+ case ETHERTYPE_IPV6:
+#endif
+ return gen_true(); /* always true */
- default:
- abort();
- }
- b0 = gen_linktype(ETHERTYPE_DN);
- /* Check for pad = 1, long header case */
- tmp = gen_mcmp(base_off + 2, BPF_H,
- (bpf_int32)ntohs(0x0681), (bpf_int32)ntohs(0x07FF));
- b1 = gen_cmp(base_off + 2 + 1 + offset_lh,
- BPF_H, (bpf_int32)ntohs(addr));
- gen_and(tmp, b1);
- /* Check for pad = 0, long header case */
- tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7);
- b2 = gen_cmp(base_off + 2 + offset_lh, BPF_H, (bpf_int32)ntohs(addr));
- gen_and(tmp, b2);
- gen_or(b2, b1);
- /* Check for pad = 1, short header case */
- tmp = gen_mcmp(base_off + 2, BPF_H,
- (bpf_int32)ntohs(0x0281), (bpf_int32)ntohs(0x07FF));
- b2 = gen_cmp(base_off + 2 + 1 + offset_sh,
- BPF_H, (bpf_int32)ntohs(addr));
- gen_and(tmp, b2);
- gen_or(b2, b1);
- /* Check for pad = 0, short header case */
- tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7);
- b2 = gen_cmp(base_off + 2 + offset_sh, BPF_H, (bpf_int32)ntohs(addr));
- gen_and(tmp, b2);
- gen_or(b2, b1);
+ default:
+ return gen_false(); /* always false */
+ }
+ break;
- /* Combine with test for linktype */
- gen_and(b0, b1);
- return b1;
-}
+ case DLT_PPP:
+ case DLT_PPP_SERIAL:
+ case DLT_PPP_ETHER:
+ /*
+ * We use Ethernet protocol types inside libpcap;
+ * map them to the corresponding PPP protocol types.
+ */
+ switch (proto) {
-static struct block *
-gen_host(addr, mask, proto, dir)
- bpf_u_int32 addr;
- bpf_u_int32 mask;
- int proto;
- int dir;
-{
- struct block *b0, *b1;
+ case ETHERTYPE_IP:
+ proto = PPP_IP;
+ break;
- switch (proto) {
+#ifdef INET6
+ case ETHERTYPE_IPV6:
+ proto = PPP_IPV6;
+ break;
+#endif
- case Q_DEFAULT:
- b0 = gen_host(addr, mask, Q_IP, dir);
- b1 = gen_host(addr, mask, Q_ARP, dir);
- gen_or(b0, b1);
- b0 = gen_host(addr, mask, Q_RARP, dir);
- gen_or(b1, b0);
- return b0;
+ case ETHERTYPE_DN:
+ proto = PPP_DECNET;
+ break;
- case Q_IP:
- return gen_hostop(addr, mask, dir, ETHERTYPE_IP,
- off_nl + 12, off_nl + 16);
+ case ETHERTYPE_ATALK:
+ proto = PPP_APPLE;
+ break;
- case Q_RARP:
- return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP,
- off_nl + 14, off_nl + 24);
+ case ETHERTYPE_NS:
+ proto = PPP_NS;
+ break;
- case Q_ARP:
- return gen_hostop(addr, mask, dir, ETHERTYPE_ARP,
- off_nl + 14, off_nl + 24);
+ case LLCSAP_ISONS:
+ proto = PPP_OSI;
+ break;
- case Q_TCP:
- bpf_error("'tcp' modifier applied to host");
+ case LLCSAP_8021D:
+ /*
+ * I'm assuming the "Bridging PDU"s that go
+ * over PPP are Spanning Tree Protocol
+ * Bridging PDUs.
+ */
+ proto = PPP_BRPDU;
+ break;
- case Q_UDP:
- bpf_error("'udp' modifier applied to host");
+ case LLCSAP_IPX:
+ proto = PPP_IPX;
+ break;
+ }
+ break;
- case Q_ICMP:
- bpf_error("'icmp' modifier applied to host");
+ case DLT_PPP_BSDOS:
+ /*
+ * We use Ethernet protocol types inside libpcap;
+ * map them to the corresponding PPP protocol types.
+ */
+ switch (proto) {
- case Q_IGMP:
- bpf_error("'igmp' modifier applied to host");
+ case ETHERTYPE_IP:
+ b0 = gen_cmp(off_linktype, BPF_H, PPP_IP);
+ b1 = gen_cmp(off_linktype, BPF_H, PPP_VJC);
+ gen_or(b0, b1);
+ b0 = gen_cmp(off_linktype, BPF_H, PPP_VJNC);
+ gen_or(b1, b0);
+ return b0;
- case Q_IGRP:
- bpf_error("'igrp' modifier applied to host");
+#ifdef INET6
+ case ETHERTYPE_IPV6:
+ proto = PPP_IPV6;
+ /* more to go? */
+ break;
+#endif
- case Q_PIM:
- bpf_error("'pim' modifier applied to host");
+ case ETHERTYPE_DN:
+ proto = PPP_DECNET;
+ break;
- case Q_ATALK:
- bpf_error("ATALK host filtering not implemented");
+ case ETHERTYPE_ATALK:
+ proto = PPP_APPLE;
+ break;
- case Q_DECNET:
- return gen_dnhostop(addr, dir, off_nl);
+ case ETHERTYPE_NS:
+ proto = PPP_NS;
+ break;
- case Q_SCA:
- bpf_error("SCA host filtering not implemented");
+ case LLCSAP_ISONS:
+ proto = PPP_OSI;
+ break;
- case Q_LAT:
- bpf_error("LAT host filtering not implemented");
+ case LLCSAP_8021D:
+ /*
+ * I'm assuming the "Bridging PDU"s that go
+ * over PPP are Spanning Tree Protocol
+ * Bridging PDUs.
+ */
+ proto = PPP_BRPDU;
+ break;
- case Q_MOPDL:
- bpf_error("MOPDL host filtering not implemented");
+ case LLCSAP_IPX:
+ proto = PPP_IPX;
+ break;
+ }
+ break;
- case Q_MOPRC:
- bpf_error("MOPRC host filtering not implemented");
+ case DLT_NULL:
+ case DLT_LOOP:
+ case DLT_ENC:
+ case DLT_PFLOG:
+ /*
+ * For DLT_NULL, the link-layer header is a 32-bit
+ * word containing an AF_ value in *host* byte order,
+ * and for DLT_ENC, the link-layer header begins
+ * with a 32-bit work containing an AF_ value in
+ * host byte order.
+ *
+ * In addition, if we're reading a saved capture file,
+ * the host byte order in the capture may not be the
+ * same as the host byte order on this machine.
+ *
+ * For DLT_LOOP, the link-layer header is a 32-bit
+ * word containing an AF_ value in *network* byte order.
+ *
+ * XXX - AF_ values may, unfortunately, be platform-
+ * dependent; for example, FreeBSD's AF_INET6 is 24
+ * whilst NetBSD's and OpenBSD's is 26.
+ *
+ * This means that, when reading a capture file, just
+ * checking for our AF_INET6 value won't work if the
+ * capture file came from another OS.
+ *
+ * XXX - what's the byte order for DLT_PFLOG?
+ */
+ switch (proto) {
+
+ case ETHERTYPE_IP:
+ proto = AF_INET;
+ break;
#ifdef INET6
- case Q_IPV6:
- bpf_error("'ip6' modifier applied to ip host");
+ case ETHERTYPE_IPV6:
+ proto = AF_INET6;
+ break;
+#endif
- case Q_ICMPV6:
- bpf_error("'icmp6' modifier applied to host");
-#endif /* INET6 */
+ default:
+ /*
+ * Not a type on which we support filtering.
+ * XXX - support those that have AF_ values
+ * #defined on this platform, at least?
+ */
+ return gen_false();
+ }
- case Q_AH:
- bpf_error("'ah' modifier applied to host");
+ if (linktype == DLT_NULL || linktype == DLT_ENC) {
+ /*
+ * The AF_ value is in host byte order, but
+ * the BPF interpreter will convert it to
+ * network byte order.
+ *
+ * If this is a save file, and it's from a
+ * machine with the opposite byte order to
+ * ours, we byte-swap the AF_ value.
+ *
+ * Then we run it through "htonl()", and
+ * generate code to compare against the result.
+ */
+ if (bpf_pcap->sf.rfile != NULL &&
+ bpf_pcap->sf.swapped)
+ proto = SWAPLONG(proto);
+ proto = htonl(proto);
+ }
+ return (gen_cmp(0, BPF_W, (bpf_int32)proto));
- case Q_ESP:
- bpf_error("'esp' modifier applied to host");
+ case DLT_ARCNET:
+ case DLT_ARCNET_LINUX:
+ /*
+ * XXX should we check for first fragment if the protocol
+ * uses PHDS?
+ */
+ switch (proto) {
- default:
- abort();
- }
- /* NOTREACHED */
-}
+ default:
+ return gen_false();
#ifdef INET6
-static struct block *
-gen_host6(addr, mask, proto, dir)
- struct in6_addr *addr;
- struct in6_addr *mask;
- int proto;
- int dir;
-{
- struct block *b0, *b1;
-
- switch (proto) {
+ case ETHERTYPE_IPV6:
+ return (gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_INET6));
+#endif /* INET6 */
- case Q_DEFAULT:
- return gen_host6(addr, mask, Q_IPV6, dir);
+ case ETHERTYPE_IP:
+ b0 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_IP);
+ b1 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_IP_OLD);
+ gen_or(b0, b1);
+ return (b1);
- case Q_IP:
- bpf_error("'ip' modifier applied to ip6 host");
+ case ETHERTYPE_ARP:
+ b0 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_ARP);
+ b1 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_ARP_OLD);
+ gen_or(b0, b1);
+ return (b1);
- case Q_RARP:
- bpf_error("'rarp' modifier applied to ip6 host");
+ case ETHERTYPE_REVARP:
+ return (gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_REVARP));
- case Q_ARP:
- bpf_error("'arp' modifier applied to ip6 host");
+ case ETHERTYPE_ATALK:
+ return (gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_ATALK));
+ }
+ break;
- case Q_TCP:
- bpf_error("'tcp' modifier applied to host");
+ case DLT_LTALK:
+ switch (proto) {
+ case ETHERTYPE_ATALK:
+ return gen_true();
+ default:
+ return gen_false();
+ }
+ break;
- case Q_UDP:
- bpf_error("'udp' modifier applied to host");
+ case DLT_FRELAY:
+ /*
+ * XXX - assumes a 2-byte Frame Relay header with
+ * DLCI and flags. What if the address is longer?
+ */
+ switch (proto) {
- case Q_ICMP:
- bpf_error("'icmp' modifier applied to host");
+ case ETHERTYPE_IP:
+ /*
+ * Check for the special NLPID for IP.
+ */
+ return gen_cmp(2, BPF_H, (0x03<<8) | 0xcc);
- case Q_IGMP:
- bpf_error("'igmp' modifier applied to host");
+#ifdef INET6
+ case ETHERTYPE_IPV6:
+ /*
+ * Check for the special NLPID for IPv6.
+ */
+ return gen_cmp(2, BPF_H, (0x03<<8) | 0x8e);
+#endif
- case Q_IGRP:
- bpf_error("'igrp' modifier applied to host");
+ case LLCSAP_ISONS:
+ /*
+ * Check for several OSI protocols.
+ *
+ * Frame Relay packets typically have an OSI
+ * NLPID at the beginning; we check for each
+ * of them.
+ *
+ * What we check for is the NLPID and a frame
+ * control field of UI, i.e. 0x03 followed
+ * by the NLPID.
+ */
+ b0 = gen_cmp(2, BPF_H, (0x03<<8) | ISO8473_CLNP);
+ b1 = gen_cmp(2, BPF_H, (0x03<<8) | ISO9542_ESIS);
+ b2 = gen_cmp(2, BPF_H, (0x03<<8) | ISO10589_ISIS);
+ gen_or(b1, b2);
+ gen_or(b0, b2);
+ return b2;
+
+ default:
+ return gen_false();
+ }
+ break;
+ }
- case Q_PIM:
- bpf_error("'pim' modifier applied to host");
+ /*
+ * All the types that have no encapsulation should either be
+ * handled as DLT_SLIP, DLT_SLIP_BSDOS, and DLT_RAW are, if
+ * all packets are IP packets, or should be handled in some
+ * special case, if none of them are (if some are and some
+ * aren't, the lack of encapsulation is a problem, as we'd
+ * have to find some other way of determining the packet type).
+ *
+ * Therefore, if "off_linktype" is -1, there's an error.
+ */
+ if (off_linktype == -1)
+ abort();
- case Q_ATALK:
- bpf_error("ATALK host filtering not implemented");
+ /*
+ * Any type not handled above should always have an Ethernet
+ * type at an offset of "off_linktype". (PPP is partially
+ * handled above - the protocol type is mapped from the
+ * Ethernet and LLC types we use internally to the corresponding
+ * PPP type - but the PPP type is always specified by a value
+ * at "off_linktype", so we don't have to do the code generation
+ * above.)
+ */
+ return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+}
- case Q_DECNET:
- bpf_error("'decnet' modifier applied to ip6 host");
-
- case Q_SCA:
- bpf_error("SCA host filtering not implemented");
-
- case Q_LAT:
- bpf_error("LAT host filtering not implemented");
-
- case Q_MOPDL:
- bpf_error("MOPDL host filtering not implemented");
-
- case Q_MOPRC:
- bpf_error("MOPRC host filtering not implemented");
-
- case Q_IPV6:
- return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6,
- off_nl + 8, off_nl + 24);
-
- case Q_ICMPV6:
- bpf_error("'icmp6' modifier applied to host");
-
- case Q_AH:
- bpf_error("'ah' modifier applied to host");
-
- case Q_ESP:
- bpf_error("'esp' modifier applied to host");
-
- default:
- abort();
- }
- /* NOTREACHED */
+/*
+ * Check for an LLC SNAP packet with a given organization code and
+ * protocol type; we check the entire contents of the 802.2 LLC and
+ * snap headers, checking for DSAP and SSAP of SNAP and a control
+ * field of 0x03 in the LLC header, and for the specified organization
+ * code and protocol type in the SNAP header.
+ */
+static struct block *
+gen_snap(orgcode, ptype, offset)
+ bpf_u_int32 orgcode;
+ bpf_u_int32 ptype;
+ u_int offset;
+{
+ u_char snapblock[8];
+
+ snapblock[0] = LLCSAP_SNAP; /* DSAP = SNAP */
+ snapblock[1] = LLCSAP_SNAP; /* SSAP = SNAP */
+ snapblock[2] = 0x03; /* control = UI */
+ snapblock[3] = (orgcode >> 16); /* upper 8 bits of organization code */
+ snapblock[4] = (orgcode >> 8); /* middle 8 bits of organization code */
+ snapblock[5] = (orgcode >> 0); /* lower 8 bits of organization code */
+ snapblock[6] = (ptype >> 8); /* upper 8 bits of protocol type */
+ snapblock[7] = (ptype >> 0); /* lower 8 bits of protocol type */
+ return gen_bcmp(offset, 8, snapblock);
}
-#endif /*INET6*/
+/*
+ * Check for a given protocol value assuming an 802.2 LLC header.
+ */
static struct block *
-gen_gateway(eaddr, alist, proto, dir)
- const u_char *eaddr;
- bpf_u_int32 **alist;
+gen_llc(proto)
int proto;
- int dir;
{
- struct block *b0, *b1, *tmp;
+ /*
+ * XXX - handle token-ring variable-length header.
+ */
+ switch (proto) {
- if (dir != 0)
- bpf_error("direction applied to 'gateway'");
+ case LLCSAP_IP:
+ return gen_cmp(off_linktype, BPF_H, (long)
+ ((LLCSAP_IP << 8) | LLCSAP_IP));
- switch (proto) {
- case Q_DEFAULT:
- case Q_IP:
- case Q_ARP:
- case Q_RARP:
- if (linktype == DLT_EN10MB)
- b0 = gen_ehostop(eaddr, Q_OR);
- else if (linktype == DLT_FDDI)
- b0 = gen_fhostop(eaddr, Q_OR);
- else
- bpf_error(
- "'gateway' supported only on ethernet or FDDI");
+ case LLCSAP_ISONS:
+ return gen_cmp(off_linktype, BPF_H, (long)
+ ((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
- b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR);
- while (*alist) {
- tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR);
- gen_or(b1, tmp);
- b1 = tmp;
+ case LLCSAP_NETBEUI:
+ return gen_cmp(off_linktype, BPF_H, (long)
+ ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+
+ case LLCSAP_IPX:
+ /*
+ * XXX - are there ever SNAP frames for IPX on
+ * non-Ethernet 802.x networks?
+ */
+ return gen_cmp(off_linktype, BPF_B, (bpf_int32)LLCSAP_IPX);
+
+ case ETHERTYPE_ATALK:
+ /*
+ * 802.2-encapsulated ETHERTYPE_ATALK packets are
+ * SNAP packets with an organization code of
+ * 0x080007 (Apple, for Appletalk) and a protocol
+ * type of ETHERTYPE_ATALK (Appletalk).
+ *
+ * XXX - check for an organization code of
+ * encapsulated Ethernet as well?
+ */
+ return gen_snap(0x080007, ETHERTYPE_ATALK, off_linktype);
+
+ default:
+ /*
+ * XXX - we don't have to check for IPX 802.3
+ * here, but should we check for the IPX Ethertype?
+ */
+ if (proto <= ETHERMTU) {
+ /*
+ * This is an LLC SAP value, so check
+ * the DSAP.
+ */
+ return gen_cmp(off_linktype, BPF_B, (bpf_int32)proto);
+ } else {
+ /*
+ * This is an Ethernet type; we assume that it's
+ * unlikely that it'll appear in the right place
+ * at random, and therefore check only the
+ * location that would hold the Ethernet type
+ * in a SNAP frame with an organization code of
+ * 0x000000 (encapsulated Ethernet).
+ *
+ * XXX - if we were to check for the SNAP DSAP and
+ * LSAP, as per XXX, and were also to check for an
+ * organization code of 0x000000 (encapsulated
+ * Ethernet), we'd do
+ *
+ * return gen_snap(0x000000, proto,
+ * off_linktype);
+ *
+ * here; for now, we don't, as per the above.
+ * I don't know whether it's worth the extra CPU
+ * time to do the right check or not.
+ */
+ return gen_cmp(off_linktype+6, BPF_H, (bpf_int32)proto);
}
- gen_not(b1);
- gen_and(b0, b1);
- return b1;
}
- bpf_error("illegal modifier of 'gateway'");
- /* NOTREACHED */
}
-struct block *
-gen_proto_abbrev(proto)
- int proto;
+static struct block *
+gen_hostop(addr, mask, dir, proto, src_off, dst_off)
+ bpf_u_int32 addr;
+ bpf_u_int32 mask;
+ int dir, proto;
+ u_int src_off, dst_off;
{
struct block *b0, *b1;
+ u_int offset;
- switch (proto) {
-
- case Q_TCP:
- b1 = gen_proto(IPPROTO_TCP, Q_IP, Q_DEFAULT);
-#ifdef INET6
- b0 = gen_proto(IPPROTO_TCP, Q_IPV6, Q_DEFAULT);
- gen_or(b0, b1);
-#endif
- break;
-
- case Q_UDP:
- b1 = gen_proto(IPPROTO_UDP, Q_IP, Q_DEFAULT);
-#ifdef INET6
- b0 = gen_proto(IPPROTO_UDP, Q_IPV6, Q_DEFAULT);
- gen_or(b0, b1);
-#endif
- break;
+ switch (dir) {
- case Q_ICMP:
- b1 = gen_proto(IPPROTO_ICMP, Q_IP, Q_DEFAULT);
+ case Q_SRC:
+ offset = src_off;
break;
- case Q_IGMP:
- b1 = gen_proto(2, Q_IP, Q_DEFAULT);
+ case Q_DST:
+ offset = dst_off;
break;
-#ifndef IPPROTO_IGRP
-#define IPPROTO_IGRP 9
-#endif
- case Q_IGRP:
- b1 = gen_proto(IPPROTO_IGRP, Q_IP, Q_DEFAULT);
+ case Q_AND:
+ b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
+ b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
gen_and(b0, b1);
- break;
-
-#ifndef IPPROTO_PIM
-#define IPPROTO_PIM 103
-#endif
+ return b1;
- case Q_PIM:
- b1 = gen_proto(IPPROTO_PIM, Q_IP, Q_DEFAULT);
-#ifdef INET6
- b0 = gen_proto(IPPROTO_PIM, Q_IPV6, Q_DEFAULT);
+ case Q_OR:
+ case Q_DEFAULT:
+ b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
+ b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
gen_or(b0, b1);
-#endif
- break;
-
- case Q_IP:
- b1 = gen_linktype(ETHERTYPE_IP);
- break;
-
- case Q_ARP:
- b1 = gen_linktype(ETHERTYPE_ARP);
- break;
-
- case Q_RARP:
- b1 = gen_linktype(ETHERTYPE_REVARP);
- break;
-
- case Q_LINK:
- bpf_error("link layer applied in wrong context");
-
- case Q_ATALK:
- b1 = gen_linktype(ETHERTYPE_ATALK);
- break;
-
- case Q_DECNET:
- b1 = gen_linktype(ETHERTYPE_DN);
- break;
-
- case Q_SCA:
- b1 = gen_linktype(ETHERTYPE_SCA);
- break;
+ return b1;
- case Q_LAT:
- b1 = gen_linktype(ETHERTYPE_LAT);
- break;
+ default:
+ abort();
+ }
+ b0 = gen_linktype(proto);
+ b1 = gen_mcmp(offset, BPF_W, (bpf_int32)addr, mask);
+ gen_and(b0, b1);
+ return b1;
+}
- case Q_MOPDL:
- b1 = gen_linktype(ETHERTYPE_MOPDL);
- break;
+#ifdef INET6
+static struct block *
+gen_hostop6(addr, mask, dir, proto, src_off, dst_off)
+ struct in6_addr *addr;
+ struct in6_addr *mask;
+ int dir, proto;
+ u_int src_off, dst_off;
+{
+ struct block *b0, *b1;
+ u_int offset;
+ u_int32_t *a, *m;
- case Q_MOPRC:
- b1 = gen_linktype(ETHERTYPE_MOPRC);
- break;
+ switch (dir) {
-#ifdef INET6
- case Q_IPV6:
- b1 = gen_linktype(ETHERTYPE_IPV6);
+ case Q_SRC:
+ offset = src_off;
break;
-#ifndef IPPROTO_ICMPV6
-#define IPPROTO_ICMPV6 58
-#endif
- case Q_ICMPV6:
- b1 = gen_proto(IPPROTO_ICMPV6, Q_IPV6, Q_DEFAULT);
+ case Q_DST:
+ offset = dst_off;
break;
-#endif /* INET6 */
-#ifndef IPPROTO_AH
-#define IPPROTO_AH 51
-#endif
- case Q_AH:
- b1 = gen_proto(IPPROTO_AH, Q_IP, Q_DEFAULT);
-#ifdef INET6
- b0 = gen_proto(IPPROTO_AH, Q_IPV6, Q_DEFAULT);
- gen_or(b0, b1);
-#endif
- break;
+ case Q_AND:
+ b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
+ b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
+ gen_and(b0, b1);
+ return b1;
-#ifndef IPPROTO_ESP
-#define IPPROTO_ESP 50
-#endif
- case Q_ESP:
- b1 = gen_proto(IPPROTO_ESP, Q_IP, Q_DEFAULT);
-#ifdef INET6
- b0 = gen_proto(IPPROTO_ESP, Q_IPV6, Q_DEFAULT);
+ case Q_OR:
+ case Q_DEFAULT:
+ b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
+ b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
gen_or(b0, b1);
-#endif
- break;
+ return b1;
default:
abort();
}
+ /* this order is important */
+ a = (u_int32_t *)addr;
+ m = (u_int32_t *)mask;
+ b1 = gen_mcmp(offset + 12, BPF_W, ntohl(a[3]), ntohl(m[3]));
+ b0 = gen_mcmp(offset + 8, BPF_W, ntohl(a[2]), ntohl(m[2]));
+ gen_and(b0, b1);
+ b0 = gen_mcmp(offset + 4, BPF_W, ntohl(a[1]), ntohl(m[1]));
+ gen_and(b0, b1);
+ b0 = gen_mcmp(offset + 0, BPF_W, ntohl(a[0]), ntohl(m[0]));
+ gen_and(b0, b1);
+ b0 = gen_linktype(proto);
+ gen_and(b0, b1);
return b1;
}
+#endif /*INET6*/
static struct block *
-gen_ipfrag()
-{
- struct slist *s;
- struct block *b;
-
- /* not ip frag */
- s = new_stmt(BPF_LD|BPF_H|BPF_ABS);
- s->s.k = off_nl + 6;
- b = new_block(JMP(BPF_JSET));
- b->s.k = 0x1fff;
- b->stmts = s;
- gen_not(b);
-
- return b;
-}
-
-static struct block *
-gen_portatom(off, v)
- int off;
- bpf_int32 v;
+gen_ehostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
{
- struct slist *s;
- struct block *b;
+ register struct block *b0, *b1;
- s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
- s->s.k = off_nl;
+ switch (dir) {
+ case Q_SRC:
+ return gen_bcmp(off_mac + 6, 6, eaddr);
- s->next = new_stmt(BPF_LD|BPF_IND|BPF_H);
- s->next->s.k = off_nl + off;
+ case Q_DST:
+ return gen_bcmp(off_mac + 0, 6, eaddr);
- b = new_block(JMP(BPF_JEQ));
- b->stmts = s;
- b->s.k = v;
+ case Q_AND:
+ b0 = gen_ehostop(eaddr, Q_SRC);
+ b1 = gen_ehostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
- return b;
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_ehostop(eaddr, Q_SRC);
+ b1 = gen_ehostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
}
-#ifdef INET6
+/*
+ * Like gen_ehostop, but for DLT_FDDI
+ */
static struct block *
-gen_portatom6(off, v)
- int off;
- bpf_int32 v;
-{
- return gen_cmp(off_nl + 40 + off, BPF_H, v);
-}
-#endif/*INET6*/
-
-struct block *
-gen_portop(port, proto, dir)
- int port, proto, dir;
+gen_fhostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
{
- struct block *b0, *b1, *tmp;
-
- /* ip proto 'proto' */
- tmp = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)proto);
- b0 = gen_ipfrag();
- gen_and(tmp, b0);
+ struct block *b0, *b1;
switch (dir) {
case Q_SRC:
- b1 = gen_portatom(0, (bpf_int32)port);
- break;
+#ifdef PCAP_FDDIPAD
+ return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr);
+#else
+ return gen_bcmp(6 + 1, 6, eaddr);
+#endif
case Q_DST:
- b1 = gen_portatom(2, (bpf_int32)port);
- break;
-
- case Q_OR:
- case Q_DEFAULT:
- tmp = gen_portatom(0, (bpf_int32)port);
- b1 = gen_portatom(2, (bpf_int32)port);
- gen_or(tmp, b1);
- break;
+#ifdef PCAP_FDDIPAD
+ return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr);
+#else
+ return gen_bcmp(0 + 1, 6, eaddr);
+#endif
case Q_AND:
- tmp = gen_portatom(0, (bpf_int32)port);
- b1 = gen_portatom(2, (bpf_int32)port);
- gen_and(tmp, b1);
- break;
+ b0 = gen_fhostop(eaddr, Q_SRC);
+ b1 = gen_fhostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
- default:
- abort();
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_fhostop(eaddr, Q_SRC);
+ b1 = gen_fhostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
}
- gen_and(b0, b1);
-
- return b1;
+ abort();
+ /* NOTREACHED */
}
+/*
+ * Like gen_ehostop, but for DLT_IEEE802 (Token Ring)
+ */
static struct block *
-gen_port(port, ip_proto, dir)
- int port;
- int ip_proto;
- int dir;
+gen_thostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
{
- struct block *b0, *b1, *tmp;
+ register struct block *b0, *b1;
- /* ether proto ip */
- b0 = gen_linktype(ETHERTYPE_IP);
+ switch (dir) {
+ case Q_SRC:
+ return gen_bcmp(8, 6, eaddr);
- switch (ip_proto) {
- case IPPROTO_UDP:
- case IPPROTO_TCP:
- b1 = gen_portop(port, ip_proto, dir);
- break;
+ case Q_DST:
+ return gen_bcmp(2, 6, eaddr);
- case PROTO_UNDEF:
- tmp = gen_portop(port, IPPROTO_TCP, dir);
- b1 = gen_portop(port, IPPROTO_UDP, dir);
- gen_or(tmp, b1);
- break;
+ case Q_AND:
+ b0 = gen_thostop(eaddr, Q_SRC);
+ b1 = gen_thostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
- default:
- abort();
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_thostop(eaddr, Q_SRC);
+ b1 = gen_thostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
}
- gen_and(b0, b1);
- return b1;
+ abort();
+ /* NOTREACHED */
}
-#ifdef INET6
-struct block *
-gen_portop6(port, proto, dir)
- int port, proto, dir;
+/*
+ * Like gen_ehostop, but for DLT_IEEE802_11 (802.11 wireless LAN)
+ */
+static struct block *
+gen_wlanhostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
{
- struct block *b0, *b1, *tmp;
-
- /* ip proto 'proto' */
- b0 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)proto);
+ register struct block *b0, *b1, *b2;
+ register struct slist *s;
switch (dir) {
case Q_SRC:
- b1 = gen_portatom6(0, (bpf_int32)port);
- break;
+ /*
+ * Oh, yuk.
+ *
+ * For control frames, there is no SA.
+ *
+ * For management frames, SA is at an
+ * offset of 10 from the beginning of
+ * the packet.
+ *
+ * For data frames, SA is at an offset
+ * of 10 from the beginning of the packet
+ * if From DS is clear, at an offset of
+ * 16 from the beginning of the packet
+ * if From DS is set and To DS is clear,
+ * and an offset of 24 from the beginning
+ * of the packet if From DS is set and To DS
+ * is set.
+ */
- case Q_DST:
- b1 = gen_portatom6(2, (bpf_int32)port);
- break;
+ /*
+ * Generate the tests to be done for data frames
+ * with From DS set.
+ *
+ * First, check for To DS set, i.e. check "link[1] & 0x01".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x01; /* To DS */
+ b1->stmts = s;
- case Q_OR:
- case Q_DEFAULT:
- tmp = gen_portatom6(0, (bpf_int32)port);
- b1 = gen_portatom6(2, (bpf_int32)port);
- gen_or(tmp, b1);
- break;
+ /*
+ * If To DS is set, the SA is at 24.
+ */
+ b0 = gen_bcmp(24, 6, eaddr);
+ gen_and(b1, b0);
- case Q_AND:
- tmp = gen_portatom6(0, (bpf_int32)port);
- b1 = gen_portatom6(2, (bpf_int32)port);
- gen_and(tmp, b1);
- break;
+ /*
+ * Now, check for To DS not set, i.e. check
+ * "!(link[1] & 0x01)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x01; /* To DS */
+ b2->stmts = s;
+ gen_not(b2);
- default:
- abort();
- }
- gen_and(b0, b1);
+ /*
+ * If To DS is not set, the SA is at 16.
+ */
+ b1 = gen_bcmp(16, 6, eaddr);
+ gen_and(b2, b1);
- return b1;
-}
+ /*
+ * Now OR together the last two checks. That gives
+ * the complete set of checks for data frames with
+ * From DS set.
+ */
+ gen_or(b1, b0);
-static struct block *
-gen_port6(port, ip_proto, dir)
- int port;
- int ip_proto;
- int dir;
-{
- struct block *b0, *b1, *tmp;
+ /*
+ * Now check for From DS being set, and AND that with
+ * the ORed-together checks.
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x02; /* From DS */
+ b1->stmts = s;
+ gen_and(b1, b0);
- /* ether proto ip */
- b0 = gen_linktype(ETHERTYPE_IPV6);
+ /*
+ * Now check for data frames with From DS not set.
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x02; /* From DS */
+ b2->stmts = s;
+ gen_not(b2);
- switch (ip_proto) {
- case IPPROTO_UDP:
- case IPPROTO_TCP:
- b1 = gen_portop6(port, ip_proto, dir);
- break;
+ /*
+ * If From DS isn't set, the SA is at 10.
+ */
+ b1 = gen_bcmp(10, 6, eaddr);
+ gen_and(b2, b1);
- case PROTO_UNDEF:
- tmp = gen_portop6(port, IPPROTO_TCP, dir);
- b1 = gen_portop6(port, IPPROTO_UDP, dir);
- gen_or(tmp, b1);
- break;
+ /*
+ * Now OR together the checks for data frames with
+ * From DS not set and for data frames with From DS
+ * set; that gives the checks done for data frames.
+ */
+ gen_or(b1, b0);
- default:
- abort();
- }
- gen_and(b0, b1);
- return b1;
-}
-#endif /* INET6 */
+ /*
+ * Now check for a data frame.
+ * I.e, check "link[0] & 0x08".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x08;
+ b1->stmts = s;
-static int
-lookup_proto(name, proto)
- register const char *name;
- register int proto;
-{
- register int v;
+ /*
+ * AND that with the checks done for data frames.
+ */
+ gen_and(b1, b0);
- switch (proto) {
+ /*
+ * If the high-order bit of the type value is 0, this
+ * is a management frame.
+ * I.e, check "!(link[0] & 0x08)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x08;
+ b2->stmts = s;
+ gen_not(b2);
- case Q_DEFAULT:
- case Q_IP:
- v = pcap_nametoproto(name);
- if (v == PROTO_UNDEF)
- bpf_error("unknown ip proto '%s'", name);
- break;
+ /*
+ * For management frames, the SA is at 10.
+ */
+ b1 = gen_bcmp(10, 6, eaddr);
+ gen_and(b2, b1);
- case Q_LINK:
- /* XXX should look up h/w protocol type based on linktype */
- v = pcap_nametoeproto(name);
- if (v == PROTO_UNDEF)
- bpf_error("unknown ether proto '%s'", name);
- break;
+ /*
+ * OR that with the checks done for data frames.
+ * That gives the checks done for management and
+ * data frames.
+ */
+ gen_or(b1, b0);
- default:
- v = PROTO_UNDEF;
- break;
+ /*
+ * If the low-order bit of the type value is 1,
+ * this is either a control frame or a frame
+ * with a reserved type, and thus not a
+ * frame with an SA.
+ *
+ * I.e., check "!(link[0] & 0x04)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x04;
+ b1->stmts = s;
+ gen_not(b1);
+
+ /*
+ * AND that with the checks for data and management
+ * frames.
+ */
+ gen_and(b1, b0);
+ return b0;
+
+ case Q_DST:
+ /*
+ * Oh, yuk.
+ *
+ * For control frames, there is no DA.
+ *
+ * For management frames, DA is at an
+ * offset of 4 from the beginning of
+ * the packet.
+ *
+ * For data frames, DA is at an offset
+ * of 4 from the beginning of the packet
+ * if To DS is clear and at an offset of
+ * 16 from the beginning of the packet
+ * if To DS is set.
+ */
+
+ /*
+ * Generate the tests to be done for data frames.
+ *
+ * First, check for To DS set, i.e. "link[1] & 0x01".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x01; /* To DS */
+ b1->stmts = s;
+
+ /*
+ * If To DS is set, the DA is at 16.
+ */
+ b0 = gen_bcmp(16, 6, eaddr);
+ gen_and(b1, b0);
+
+ /*
+ * Now, check for To DS not set, i.e. check
+ * "!(link[1] & 0x01)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x01; /* To DS */
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * If To DS is not set, the DA is at 4.
+ */
+ b1 = gen_bcmp(4, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * Now OR together the last two checks. That gives
+ * the complete set of checks for data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * Now check for a data frame.
+ * I.e, check "link[0] & 0x08".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x08;
+ b1->stmts = s;
+
+ /*
+ * AND that with the checks done for data frames.
+ */
+ gen_and(b1, b0);
+
+ /*
+ * If the high-order bit of the type value is 0, this
+ * is a management frame.
+ * I.e, check "!(link[0] & 0x08)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x08;
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * For management frames, the DA is at 4.
+ */
+ b1 = gen_bcmp(4, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * OR that with the checks done for data frames.
+ * That gives the checks done for management and
+ * data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * If the low-order bit of the type value is 1,
+ * this is either a control frame or a frame
+ * with a reserved type, and thus not a
+ * frame with an SA.
+ *
+ * I.e., check "!(link[0] & 0x04)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x04;
+ b1->stmts = s;
+ gen_not(b1);
+
+ /*
+ * AND that with the checks for data and management
+ * frames.
+ */
+ gen_and(b1, b0);
+ return b0;
+
+ case Q_AND:
+ b0 = gen_wlanhostop(eaddr, Q_SRC);
+ b1 = gen_wlanhostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_wlanhostop(eaddr, Q_SRC);
+ b1 = gen_wlanhostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
}
- return v;
+ abort();
+ /* NOTREACHED */
}
-struct stmt *
-gen_joinsp(s, n)
- struct stmt **s;
- int n;
+/*
+ * Like gen_ehostop, but for RFC 2625 IP-over-Fibre-Channel.
+ * (We assume that the addresses are IEEE 48-bit MAC addresses,
+ * as the RFC states.)
+ */
+static struct block *
+gen_ipfchostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
{
+ register struct block *b0, *b1;
+
+ switch (dir) {
+ case Q_SRC:
+ return gen_bcmp(10, 6, eaddr);
+
+ case Q_DST:
+ return gen_bcmp(2, 6, eaddr);
+
+ case Q_AND:
+ b0 = gen_ipfchostop(eaddr, Q_SRC);
+ b1 = gen_ipfchostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_ipfchostop(eaddr, Q_SRC);
+ b1 = gen_ipfchostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
}
-struct block *
-gen_protochain(v, proto, dir)
- int v;
- int proto;
+/*
+ * This is quite tricky because there may be pad bytes in front of the
+ * DECNET header, and then there are two possible data packet formats that
+ * carry both src and dst addresses, plus 5 packet types in a format that
+ * carries only the src node, plus 2 types that use a different format and
+ * also carry just the src node.
+ *
+ * Yuck.
+ *
+ * Instead of doing those all right, we just look for data packets with
+ * 0 or 1 bytes of padding. If you want to look at other packets, that
+ * will require a lot more hacking.
+ *
+ * To add support for filtering on DECNET "areas" (network numbers)
+ * one would want to add a "mask" argument to this routine. That would
+ * make the filter even more inefficient, although one could be clever
+ * and not generate masking instructions if the mask is 0xFFFF.
+ */
+static struct block *
+gen_dnhostop(addr, dir, base_off)
+ bpf_u_int32 addr;
int dir;
+ u_int base_off;
{
-#ifdef NO_PROTOCHAIN
- return gen_proto(v, proto, dir);
-#else
- struct block *b0, *b;
- struct slist *s[100], *sp;
- int fix2, fix3, fix4, fix5;
- int ahcheck, again, end;
- int i, max;
- int reg1 = alloc_reg();
- int reg2 = alloc_reg();
+ struct block *b0, *b1, *b2, *tmp;
+ u_int offset_lh; /* offset if long header is received */
+ u_int offset_sh; /* offset if short header is received */
- memset(s, 0, sizeof(s));
- fix2 = fix3 = fix4 = fix5 = 0;
+ switch (dir) {
- switch (proto) {
- case Q_IP:
- case Q_IPV6:
+ case Q_DST:
+ offset_sh = 1; /* follows flags */
+ offset_lh = 7; /* flgs,darea,dsubarea,HIORD */
+ break;
+
+ case Q_SRC:
+ offset_sh = 3; /* follows flags, dstnode */
+ offset_lh = 15; /* flgs,darea,dsubarea,did,sarea,ssub,HIORD */
break;
+
+ case Q_AND:
+ /* Inefficient because we do our Calvinball dance twice */
+ b0 = gen_dnhostop(addr, Q_SRC, base_off);
+ b1 = gen_dnhostop(addr, Q_DST, base_off);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_OR:
case Q_DEFAULT:
- b0 = gen_protochain(v, Q_IP, dir);
- b = gen_protochain(v, Q_IPV6, dir);
- gen_or(b0, b);
- return b;
+ /* Inefficient because we do our Calvinball dance twice */
+ b0 = gen_dnhostop(addr, Q_SRC, base_off);
+ b1 = gen_dnhostop(addr, Q_DST, base_off);
+ gen_or(b0, b1);
+ return b1;
+
+ case Q_ISO:
+ bpf_error("ISO host filtering not implemented");
+
default:
- bpf_error("bad protocol applied for 'protochain'");
- /*NOTREACHED*/
+ abort();
}
+ b0 = gen_linktype(ETHERTYPE_DN);
+ /* Check for pad = 1, long header case */
+ tmp = gen_mcmp(base_off + 2, BPF_H,
+ (bpf_int32)ntohs(0x0681), (bpf_int32)ntohs(0x07FF));
+ b1 = gen_cmp(base_off + 2 + 1 + offset_lh,
+ BPF_H, (bpf_int32)ntohs(addr));
+ gen_and(tmp, b1);
+ /* Check for pad = 0, long header case */
+ tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7);
+ b2 = gen_cmp(base_off + 2 + offset_lh, BPF_H, (bpf_int32)ntohs(addr));
+ gen_and(tmp, b2);
+ gen_or(b2, b1);
+ /* Check for pad = 1, short header case */
+ tmp = gen_mcmp(base_off + 2, BPF_H,
+ (bpf_int32)ntohs(0x0281), (bpf_int32)ntohs(0x07FF));
+ b2 = gen_cmp(base_off + 2 + 1 + offset_sh,
+ BPF_H, (bpf_int32)ntohs(addr));
+ gen_and(tmp, b2);
+ gen_or(b2, b1);
+ /* Check for pad = 0, short header case */
+ tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7);
+ b2 = gen_cmp(base_off + 2 + offset_sh, BPF_H, (bpf_int32)ntohs(addr));
+ gen_and(tmp, b2);
+ gen_or(b2, b1);
- no_optimize = 1; /*this code is not compatible with optimzer yet */
+ /* Combine with test for linktype */
+ gen_and(b0, b1);
+ return b1;
+}
- /*
- * s[0] is a dummy entry to protect other BPF insn from damaged
- * by s[fix] = foo with uninitialized variable "fix". It is somewhat
- * hard to find interdependency made by jump table fixup.
- */
- i = 0;
- s[i] = new_stmt(0); /*dummy*/
- i++;
+static struct block *
+gen_host(addr, mask, proto, dir)
+ bpf_u_int32 addr;
+ bpf_u_int32 mask;
+ int proto;
+ int dir;
+{
+ struct block *b0, *b1;
switch (proto) {
+
+ case Q_DEFAULT:
+ b0 = gen_host(addr, mask, Q_IP, dir);
+ if (off_linktype != -1) {
+ b1 = gen_host(addr, mask, Q_ARP, dir);
+ gen_or(b0, b1);
+ b0 = gen_host(addr, mask, Q_RARP, dir);
+ gen_or(b1, b0);
+ }
+ return b0;
+
case Q_IP:
- b0 = gen_linktype(ETHERTYPE_IP);
+ return gen_hostop(addr, mask, dir, ETHERTYPE_IP,
+ off_nl + 12, off_nl + 16);
- /* A = ip->ip_p */
- s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
- s[i]->s.k = off_nl + 9;
- i++;
- /* X = ip->ip_hl << 2 */
- s[i] = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
- s[i]->s.k = off_nl;
- i++;
- break;
-#ifdef INET6
- case Q_IPV6:
- b0 = gen_linktype(ETHERTYPE_IPV6);
+ case Q_RARP:
+ return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP,
+ off_nl + 14, off_nl + 24);
+
+ case Q_ARP:
+ return gen_hostop(addr, mask, dir, ETHERTYPE_ARP,
+ off_nl + 14, off_nl + 24);
+
+ case Q_TCP:
+ bpf_error("'tcp' modifier applied to host");
+
+ case Q_SCTP:
+ bpf_error("'sctp' modifier applied to host");
+
+ case Q_UDP:
+ bpf_error("'udp' modifier applied to host");
+
+ case Q_ICMP:
+ bpf_error("'icmp' modifier applied to host");
+
+ case Q_IGMP:
+ bpf_error("'igmp' modifier applied to host");
+
+ case Q_IGRP:
+ bpf_error("'igrp' modifier applied to host");
+
+ case Q_PIM:
+ bpf_error("'pim' modifier applied to host");
+
+ case Q_VRRP:
+ bpf_error("'vrrp' modifier applied to host");
+
+ case Q_ATALK:
+ bpf_error("ATALK host filtering not implemented");
+
+ case Q_AARP:
+ bpf_error("AARP host filtering not implemented");
+
+ case Q_DECNET:
+ return gen_dnhostop(addr, dir, off_nl);
+
+ case Q_SCA:
+ bpf_error("SCA host filtering not implemented");
+
+ case Q_LAT:
+ bpf_error("LAT host filtering not implemented");
+
+ case Q_MOPDL:
+ bpf_error("MOPDL host filtering not implemented");
+
+ case Q_MOPRC:
+ bpf_error("MOPRC host filtering not implemented");
+
+#ifdef INET6
+ case Q_IPV6:
+ bpf_error("'ip6' modifier applied to ip host");
+
+ case Q_ICMPV6:
+ bpf_error("'icmp6' modifier applied to host");
+#endif /* INET6 */
+
+ case Q_AH:
+ bpf_error("'ah' modifier applied to host");
+
+ case Q_ESP:
+ bpf_error("'esp' modifier applied to host");
+
+ case Q_ISO:
+ bpf_error("ISO host filtering not implemented");
+
+ case Q_ESIS:
+ bpf_error("'esis' modifier applied to host");
+
+ case Q_ISIS:
+ bpf_error("'isis' modifier applied to host");
+
+ case Q_CLNP:
+ bpf_error("'clnp' modifier applied to host");
+
+ case Q_STP:
+ bpf_error("'stp' modifier applied to host");
+
+ case Q_IPX:
+ bpf_error("IPX host filtering not implemented");
+
+ case Q_NETBEUI:
+ bpf_error("'netbeui' modifier applied to host");
- /* A = ip6->ip_nxt */
- s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
- s[i]->s.k = off_nl + 6;
- i++;
- /* X = sizeof(struct ip6_hdr) */
- s[i] = new_stmt(BPF_LDX|BPF_IMM);
- s[i]->s.k = 40;
- i++;
- break;
-#endif
default:
- bpf_error("unsupported proto to gen_protochain");
- /*NOTREACHED*/
+ abort();
}
+ /* NOTREACHED */
+}
- /* again: if (A == v) goto end; else fall through; */
- again = i;
- s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
- s[i]->s.k = v;
- s[i]->s.jt = NULL; /*later*/
- s[i]->s.jf = NULL; /*update in next stmt*/
- fix5 = i;
- i++;
+#ifdef INET6
+static struct block *
+gen_host6(addr, mask, proto, dir)
+ struct in6_addr *addr;
+ struct in6_addr *mask;
+ int proto;
+ int dir;
+{
+ switch (proto) {
-#ifndef IPPROTO_NONE
-#define IPPROTO_NONE 59
+ case Q_DEFAULT:
+ return gen_host6(addr, mask, Q_IPV6, dir);
+
+ case Q_IP:
+ bpf_error("'ip' modifier applied to ip6 host");
+
+ case Q_RARP:
+ bpf_error("'rarp' modifier applied to ip6 host");
+
+ case Q_ARP:
+ bpf_error("'arp' modifier applied to ip6 host");
+
+ case Q_SCTP:
+ bpf_error("'sctp' modifier applied to host");
+
+ case Q_TCP:
+ bpf_error("'tcp' modifier applied to host");
+
+ case Q_UDP:
+ bpf_error("'udp' modifier applied to host");
+
+ case Q_ICMP:
+ bpf_error("'icmp' modifier applied to host");
+
+ case Q_IGMP:
+ bpf_error("'igmp' modifier applied to host");
+
+ case Q_IGRP:
+ bpf_error("'igrp' modifier applied to host");
+
+ case Q_PIM:
+ bpf_error("'pim' modifier applied to host");
+
+ case Q_VRRP:
+ bpf_error("'vrrp' modifier applied to host");
+
+ case Q_ATALK:
+ bpf_error("ATALK host filtering not implemented");
+
+ case Q_AARP:
+ bpf_error("AARP host filtering not implemented");
+
+ case Q_DECNET:
+ bpf_error("'decnet' modifier applied to ip6 host");
+
+ case Q_SCA:
+ bpf_error("SCA host filtering not implemented");
+
+ case Q_LAT:
+ bpf_error("LAT host filtering not implemented");
+
+ case Q_MOPDL:
+ bpf_error("MOPDL host filtering not implemented");
+
+ case Q_MOPRC:
+ bpf_error("MOPRC host filtering not implemented");
+
+ case Q_IPV6:
+ return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6,
+ off_nl + 8, off_nl + 24);
+
+ case Q_ICMPV6:
+ bpf_error("'icmp6' modifier applied to host");
+
+ case Q_AH:
+ bpf_error("'ah' modifier applied to host");
+
+ case Q_ESP:
+ bpf_error("'esp' modifier applied to host");
+
+ case Q_ISO:
+ bpf_error("ISO host filtering not implemented");
+
+ case Q_ESIS:
+ bpf_error("'esis' modifier applied to host");
+
+ case Q_ISIS:
+ bpf_error("'isis' modifier applied to host");
+
+ case Q_CLNP:
+ bpf_error("'clnp' modifier applied to host");
+
+ case Q_STP:
+ bpf_error("'stp' modifier applied to host");
+
+ case Q_IPX:
+ bpf_error("IPX host filtering not implemented");
+
+ case Q_NETBEUI:
+ bpf_error("'netbeui' modifier applied to host");
+
+ default:
+ abort();
+ }
+ /* NOTREACHED */
+}
+#endif /*INET6*/
+
+#ifndef INET6
+static struct block *
+gen_gateway(eaddr, alist, proto, dir)
+ const u_char *eaddr;
+ bpf_u_int32 **alist;
+ int proto;
+ int dir;
+{
+ struct block *b0, *b1, *tmp;
+
+ if (dir != 0)
+ bpf_error("direction applied to 'gateway'");
+
+ switch (proto) {
+ case Q_DEFAULT:
+ case Q_IP:
+ case Q_ARP:
+ case Q_RARP:
+ if (linktype == DLT_EN10MB)
+ b0 = gen_ehostop(eaddr, Q_OR);
+ else if (linktype == DLT_FDDI)
+ b0 = gen_fhostop(eaddr, Q_OR);
+ else if (linktype == DLT_IEEE802)
+ b0 = gen_thostop(eaddr, Q_OR);
+ else if (linktype == DLT_IEEE802_11)
+ b0 = gen_wlanhostop(eaddr, Q_OR);
+ else if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b1 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b1);
+
+ /*
+ * Now check the MAC address.
+ */
+ b0 = gen_ehostop(eaddr, Q_OR);
+ gen_and(b1, b0);
+ } else if (linktype == DLT_IP_OVER_FC)
+ b0 = gen_ipfchostop(eaddr, Q_OR);
+ else
+ bpf_error(
+ "'gateway' supported only on ethernet/FDDI/token ring/802.11/Fibre Channel");
+
+ b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR);
+ while (*alist) {
+ tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR);
+ gen_or(b1, tmp);
+ b1 = tmp;
+ }
+ gen_not(b1);
+ gen_and(b0, b1);
+ return b1;
+ }
+ bpf_error("illegal modifier of 'gateway'");
+ /* NOTREACHED */
+}
#endif
- /* if (A == IPPROTO_NONE) goto end */
- s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
- s[i]->s.jt = NULL; /*later*/
- s[i]->s.jf = NULL; /*update in next stmt*/
- s[i]->s.k = IPPROTO_NONE;
- s[fix5]->s.jf = s[i];
- fix2 = i;
- i++;
+struct block *
+gen_proto_abbrev(proto)
+ int proto;
+{
+ struct block *b0;
+ struct block *b1;
+
+ switch (proto) {
+
+ case Q_SCTP:
+ b1 = gen_proto(IPPROTO_SCTP, Q_IP, Q_DEFAULT);
#ifdef INET6
- if (proto == Q_IPV6) {
- int v6start, v6end, v6advance, j;
+ b0 = gen_proto(IPPROTO_SCTP, Q_IPV6, Q_DEFAULT);
+ gen_or(b0, b1);
+#endif
+ break;
- v6start = i;
- /* if (A == IPPROTO_HOPOPTS) goto v6advance */
- s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
- s[i]->s.jt = NULL; /*later*/
- s[i]->s.jf = NULL; /*update in next stmt*/
- s[i]->s.k = IPPROTO_HOPOPTS;
- s[fix2]->s.jf = s[i];
- i++;
- /* if (A == IPPROTO_DSTOPTS) goto v6advance */
- s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
- s[i]->s.jt = NULL; /*later*/
- s[i]->s.jf = NULL; /*update in next stmt*/
- s[i]->s.k = IPPROTO_DSTOPTS;
- i++;
- /* if (A == IPPROTO_ROUTING) goto v6advance */
- s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
- s[i]->s.jt = NULL; /*later*/
- s[i]->s.jf = NULL; /*update in next stmt*/
- s[i]->s.k = IPPROTO_ROUTING;
- i++;
- /* if (A == IPPROTO_FRAGMENT) goto v6advance; else goto ahcheck; */
- s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ case Q_TCP:
+ b1 = gen_proto(IPPROTO_TCP, Q_IP, Q_DEFAULT);
+#ifdef INET6
+ b0 = gen_proto(IPPROTO_TCP, Q_IPV6, Q_DEFAULT);
+ gen_or(b0, b1);
+#endif
+ break;
+
+ case Q_UDP:
+ b1 = gen_proto(IPPROTO_UDP, Q_IP, Q_DEFAULT);
+#ifdef INET6
+ b0 = gen_proto(IPPROTO_UDP, Q_IPV6, Q_DEFAULT);
+ gen_or(b0, b1);
+#endif
+ break;
+
+ case Q_ICMP:
+ b1 = gen_proto(IPPROTO_ICMP, Q_IP, Q_DEFAULT);
+ break;
+
+#ifndef IPPROTO_IGMP
+#define IPPROTO_IGMP 2
+#endif
+
+ case Q_IGMP:
+ b1 = gen_proto(IPPROTO_IGMP, Q_IP, Q_DEFAULT);
+ break;
+
+#ifndef IPPROTO_IGRP
+#define IPPROTO_IGRP 9
+#endif
+ case Q_IGRP:
+ b1 = gen_proto(IPPROTO_IGRP, Q_IP, Q_DEFAULT);
+ break;
+
+#ifndef IPPROTO_PIM
+#define IPPROTO_PIM 103
+#endif
+
+ case Q_PIM:
+ b1 = gen_proto(IPPROTO_PIM, Q_IP, Q_DEFAULT);
+#ifdef INET6
+ b0 = gen_proto(IPPROTO_PIM, Q_IPV6, Q_DEFAULT);
+ gen_or(b0, b1);
+#endif
+ break;
+
+#ifndef IPPROTO_VRRP
+#define IPPROTO_VRRP 112
+#endif
+
+ case Q_VRRP:
+ b1 = gen_proto(IPPROTO_VRRP, Q_IP, Q_DEFAULT);
+ break;
+
+ case Q_IP:
+ b1 = gen_linktype(ETHERTYPE_IP);
+ break;
+
+ case Q_ARP:
+ b1 = gen_linktype(ETHERTYPE_ARP);
+ break;
+
+ case Q_RARP:
+ b1 = gen_linktype(ETHERTYPE_REVARP);
+ break;
+
+ case Q_LINK:
+ bpf_error("link layer applied in wrong context");
+
+ case Q_ATALK:
+ b1 = gen_linktype(ETHERTYPE_ATALK);
+ break;
+
+ case Q_AARP:
+ b1 = gen_linktype(ETHERTYPE_AARP);
+ break;
+
+ case Q_DECNET:
+ b1 = gen_linktype(ETHERTYPE_DN);
+ break;
+
+ case Q_SCA:
+ b1 = gen_linktype(ETHERTYPE_SCA);
+ break;
+
+ case Q_LAT:
+ b1 = gen_linktype(ETHERTYPE_LAT);
+ break;
+
+ case Q_MOPDL:
+ b1 = gen_linktype(ETHERTYPE_MOPDL);
+ break;
+
+ case Q_MOPRC:
+ b1 = gen_linktype(ETHERTYPE_MOPRC);
+ break;
+
+#ifdef INET6
+ case Q_IPV6:
+ b1 = gen_linktype(ETHERTYPE_IPV6);
+ break;
+
+#ifndef IPPROTO_ICMPV6
+#define IPPROTO_ICMPV6 58
+#endif
+ case Q_ICMPV6:
+ b1 = gen_proto(IPPROTO_ICMPV6, Q_IPV6, Q_DEFAULT);
+ break;
+#endif /* INET6 */
+
+#ifndef IPPROTO_AH
+#define IPPROTO_AH 51
+#endif
+ case Q_AH:
+ b1 = gen_proto(IPPROTO_AH, Q_IP, Q_DEFAULT);
+#ifdef INET6
+ b0 = gen_proto(IPPROTO_AH, Q_IPV6, Q_DEFAULT);
+ gen_or(b0, b1);
+#endif
+ break;
+
+#ifndef IPPROTO_ESP
+#define IPPROTO_ESP 50
+#endif
+ case Q_ESP:
+ b1 = gen_proto(IPPROTO_ESP, Q_IP, Q_DEFAULT);
+#ifdef INET6
+ b0 = gen_proto(IPPROTO_ESP, Q_IPV6, Q_DEFAULT);
+ gen_or(b0, b1);
+#endif
+ break;
+
+ case Q_ISO:
+ b1 = gen_linktype(LLCSAP_ISONS);
+ break;
+
+ case Q_ESIS:
+ b1 = gen_proto(ISO9542_ESIS, Q_ISO, Q_DEFAULT);
+ break;
+
+ case Q_ISIS:
+ b1 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
+ break;
+
+ case Q_ISIS_L1: /* all IS-IS Level1 PDU-Types */
+ b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); /* FIXME extract the circuit-type bits */
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_L2: /* all IS-IS Level2 PDU-Types */
+ b0 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); /* FIXME extract the circuit-type bits */
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_IIH: /* all IS-IS Hello PDU-Types */
+ b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_LSP:
+ b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_SNP:
+ b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_CSNP:
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_PSNP:
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_CLNP:
+ b1 = gen_proto(ISO8473_CLNP, Q_ISO, Q_DEFAULT);
+ break;
+
+ case Q_STP:
+ b1 = gen_linktype(LLCSAP_8021D);
+ break;
+
+ case Q_IPX:
+ b1 = gen_linktype(LLCSAP_IPX);
+ break;
+
+ case Q_NETBEUI:
+ b1 = gen_linktype(LLCSAP_NETBEUI);
+ break;
+
+ default:
+ abort();
+ }
+ return b1;
+}
+
+static struct block *
+gen_ipfrag()
+{
+ struct slist *s;
+ struct block *b;
+
+ /* not ip frag */
+ s = new_stmt(BPF_LD|BPF_H|BPF_ABS);
+ s->s.k = off_nl + 6;
+ b = new_block(JMP(BPF_JSET));
+ b->s.k = 0x1fff;
+ b->stmts = s;
+ gen_not(b);
+
+ return b;
+}
+
+static struct block *
+gen_portatom(off, v)
+ int off;
+ bpf_int32 v;
+{
+ struct slist *s;
+ struct block *b;
+
+ s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
+ s->s.k = off_nl;
+
+ s->next = new_stmt(BPF_LD|BPF_IND|BPF_H);
+ s->next->s.k = off_nl + off;
+
+ b = new_block(JMP(BPF_JEQ));
+ b->stmts = s;
+ b->s.k = v;
+
+ return b;
+}
+
+#ifdef INET6
+static struct block *
+gen_portatom6(off, v)
+ int off;
+ bpf_int32 v;
+{
+ return gen_cmp(off_nl + 40 + off, BPF_H, v);
+}
+#endif/*INET6*/
+
+struct block *
+gen_portop(port, proto, dir)
+ int port, proto, dir;
+{
+ struct block *b0, *b1, *tmp;
+
+ /* ip proto 'proto' */
+ tmp = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)proto);
+ b0 = gen_ipfrag();
+ gen_and(tmp, b0);
+
+ switch (dir) {
+ case Q_SRC:
+ b1 = gen_portatom(0, (bpf_int32)port);
+ break;
+
+ case Q_DST:
+ b1 = gen_portatom(2, (bpf_int32)port);
+ break;
+
+ case Q_OR:
+ case Q_DEFAULT:
+ tmp = gen_portatom(0, (bpf_int32)port);
+ b1 = gen_portatom(2, (bpf_int32)port);
+ gen_or(tmp, b1);
+ break;
+
+ case Q_AND:
+ tmp = gen_portatom(0, (bpf_int32)port);
+ b1 = gen_portatom(2, (bpf_int32)port);
+ gen_and(tmp, b1);
+ break;
+
+ default:
+ abort();
+ }
+ gen_and(b0, b1);
+
+ return b1;
+}
+
+static struct block *
+gen_port(port, ip_proto, dir)
+ int port;
+ int ip_proto;
+ int dir;
+{
+ struct block *b0, *b1, *tmp;
+
+ /*
+ * ether proto ip
+ *
+ * For FDDI, RFC 1188 says that SNAP encapsulation is used,
+ * not LLC encapsulation with LLCSAP_IP.
+ *
+ * For IEEE 802 networks - which includes 802.5 token ring
+ * (which is what DLT_IEEE802 means) and 802.11 - RFC 1042
+ * says that SNAP encapsulation is used, not LLC encapsulation
+ * with LLCSAP_IP.
+ *
+ * For LLC-encapsulated ATM/"Classical IP", RFC 1483 and
+ * RFC 2225 say that SNAP encapsulation is used, not LLC
+ * encapsulation with LLCSAP_IP.
+ *
+ * So we always check for ETHERTYPE_IP.
+ */
+ b0 = gen_linktype(ETHERTYPE_IP);
+
+ switch (ip_proto) {
+ case IPPROTO_UDP:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
+ b1 = gen_portop(port, ip_proto, dir);
+ break;
+
+ case PROTO_UNDEF:
+ tmp = gen_portop(port, IPPROTO_TCP, dir);
+ b1 = gen_portop(port, IPPROTO_UDP, dir);
+ gen_or(tmp, b1);
+ tmp = gen_portop(port, IPPROTO_SCTP, dir);
+ gen_or(tmp, b1);
+ break;
+
+ default:
+ abort();
+ }
+ gen_and(b0, b1);
+ return b1;
+}
+
+#ifdef INET6
+struct block *
+gen_portop6(port, proto, dir)
+ int port, proto, dir;
+{
+ struct block *b0, *b1, *tmp;
+
+ /* ip proto 'proto' */
+ b0 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)proto);
+
+ switch (dir) {
+ case Q_SRC:
+ b1 = gen_portatom6(0, (bpf_int32)port);
+ break;
+
+ case Q_DST:
+ b1 = gen_portatom6(2, (bpf_int32)port);
+ break;
+
+ case Q_OR:
+ case Q_DEFAULT:
+ tmp = gen_portatom6(0, (bpf_int32)port);
+ b1 = gen_portatom6(2, (bpf_int32)port);
+ gen_or(tmp, b1);
+ break;
+
+ case Q_AND:
+ tmp = gen_portatom6(0, (bpf_int32)port);
+ b1 = gen_portatom6(2, (bpf_int32)port);
+ gen_and(tmp, b1);
+ break;
+
+ default:
+ abort();
+ }
+ gen_and(b0, b1);
+
+ return b1;
+}
+
+static struct block *
+gen_port6(port, ip_proto, dir)
+ int port;
+ int ip_proto;
+ int dir;
+{
+ struct block *b0, *b1, *tmp;
+
+ /* ether proto ip */
+ b0 = gen_linktype(ETHERTYPE_IPV6);
+
+ switch (ip_proto) {
+ case IPPROTO_UDP:
+ case IPPROTO_TCP:
+ case IPPROTO_SCTP:
+ b1 = gen_portop6(port, ip_proto, dir);
+ break;
+
+ case PROTO_UNDEF:
+ tmp = gen_portop6(port, IPPROTO_TCP, dir);
+ b1 = gen_portop6(port, IPPROTO_UDP, dir);
+ gen_or(tmp, b1);
+ tmp = gen_portop6(port, IPPROTO_SCTP, dir);
+ gen_or(tmp, b1);
+ break;
+
+ default:
+ abort();
+ }
+ gen_and(b0, b1);
+ return b1;
+}
+#endif /* INET6 */
+
+static int
+lookup_proto(name, proto)
+ register const char *name;
+ register int proto;
+{
+ register int v;
+
+ switch (proto) {
+
+ case Q_DEFAULT:
+ case Q_IP:
+ case Q_IPV6:
+ v = pcap_nametoproto(name);
+ if (v == PROTO_UNDEF)
+ bpf_error("unknown ip proto '%s'", name);
+ break;
+
+ case Q_LINK:
+ /* XXX should look up h/w protocol type based on linktype */
+ v = pcap_nametoeproto(name);
+ if (v == PROTO_UNDEF)
+ bpf_error("unknown ether proto '%s'", name);
+ break;
+
+ case Q_ISO:
+ if (strcmp(name, "esis") == 0)
+ v = ISO9542_ESIS;
+ else if (strcmp(name, "isis") == 0)
+ v = ISO10589_ISIS;
+ else if (strcmp(name, "clnp") == 0)
+ v = ISO8473_CLNP;
+ else
+ bpf_error("unknown osi proto '%s'", name);
+ break;
+
+ default:
+ v = PROTO_UNDEF;
+ break;
+ }
+ return v;
+}
+
+#if 0
+struct stmt *
+gen_joinsp(s, n)
+ struct stmt **s;
+ int n;
+{
+ return NULL;
+}
+#endif
+
+static struct block *
+gen_protochain(v, proto, dir)
+ int v;
+ int proto;
+ int dir;
+{
+#ifdef NO_PROTOCHAIN
+ return gen_proto(v, proto, dir);
+#else
+ struct block *b0, *b;
+ struct slist *s[100];
+ int fix2, fix3, fix4, fix5;
+ int ahcheck, again, end;
+ int i, max;
+ int reg2 = alloc_reg();
+
+ memset(s, 0, sizeof(s));
+ fix2 = fix3 = fix4 = fix5 = 0;
+
+ switch (proto) {
+ case Q_IP:
+ case Q_IPV6:
+ break;
+ case Q_DEFAULT:
+ b0 = gen_protochain(v, Q_IP, dir);
+ b = gen_protochain(v, Q_IPV6, dir);
+ gen_or(b0, b);
+ return b;
+ default:
+ bpf_error("bad protocol applied for 'protochain'");
+ /*NOTREACHED*/
+ }
+
+ no_optimize = 1; /*this code is not compatible with optimzer yet */
+
+ /*
+ * s[0] is a dummy entry to protect other BPF insn from damaged
+ * by s[fix] = foo with uninitialized variable "fix". It is somewhat
+ * hard to find interdependency made by jump table fixup.
+ */
+ i = 0;
+ s[i] = new_stmt(0); /*dummy*/
+ i++;
+
+ switch (proto) {
+ case Q_IP:
+ b0 = gen_linktype(ETHERTYPE_IP);
+
+ /* A = ip->ip_p */
+ s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
+ s[i]->s.k = off_nl + 9;
+ i++;
+ /* X = ip->ip_hl << 2 */
+ s[i] = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
+ s[i]->s.k = off_nl;
+ i++;
+ break;
+#ifdef INET6
+ case Q_IPV6:
+ b0 = gen_linktype(ETHERTYPE_IPV6);
+
+ /* A = ip6->ip_nxt */
+ s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
+ s[i]->s.k = off_nl + 6;
+ i++;
+ /* X = sizeof(struct ip6_hdr) */
+ s[i] = new_stmt(BPF_LDX|BPF_IMM);
+ s[i]->s.k = 40;
+ i++;
+ break;
+#endif
+ default:
+ bpf_error("unsupported proto to gen_protochain");
+ /*NOTREACHED*/
+ }
+
+ /* again: if (A == v) goto end; else fall through; */
+ again = i;
+ s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ s[i]->s.k = v;
+ s[i]->s.jt = NULL; /*later*/
+ s[i]->s.jf = NULL; /*update in next stmt*/
+ fix5 = i;
+ i++;
+
+#ifndef IPPROTO_NONE
+#define IPPROTO_NONE 59
+#endif
+ /* if (A == IPPROTO_NONE) goto end */
+ s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ s[i]->s.jt = NULL; /*later*/
+ s[i]->s.jf = NULL; /*update in next stmt*/
+ s[i]->s.k = IPPROTO_NONE;
+ s[fix5]->s.jf = s[i];
+ fix2 = i;
+ i++;
+
+#ifdef INET6
+ if (proto == Q_IPV6) {
+ int v6start, v6end, v6advance, j;
+
+ v6start = i;
+ /* if (A == IPPROTO_HOPOPTS) goto v6advance */
+ s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ s[i]->s.jt = NULL; /*later*/
+ s[i]->s.jf = NULL; /*update in next stmt*/
+ s[i]->s.k = IPPROTO_HOPOPTS;
+ s[fix2]->s.jf = s[i];
+ i++;
+ /* if (A == IPPROTO_DSTOPTS) goto v6advance */
+ s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ s[i]->s.jt = NULL; /*later*/
+ s[i]->s.jf = NULL; /*update in next stmt*/
+ s[i]->s.k = IPPROTO_DSTOPTS;
+ i++;
+ /* if (A == IPPROTO_ROUTING) goto v6advance */
+ s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ s[i]->s.jt = NULL; /*later*/
+ s[i]->s.jf = NULL; /*update in next stmt*/
+ s[i]->s.k = IPPROTO_ROUTING;
+ i++;
+ /* if (A == IPPROTO_FRAGMENT) goto v6advance; else goto ahcheck; */
+ s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL; /*later*/
s[i]->s.jf = NULL; /*later*/
s[i]->s.k = IPPROTO_FRAGMENT;
v6end = i;
i++;
- /* v6advance: */
- v6advance = i;
+ /* v6advance: */
+ v6advance = i;
+
+ /*
+ * in short,
+ * A = P[X];
+ * X = X + (P[X + 1] + 1) * 8;
+ */
+ /* A = X */
+ s[i] = new_stmt(BPF_MISC|BPF_TXA);
+ i++;
+ /* A = P[X + packet head] */
+ s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
+ s[i]->s.k = off_nl;
+ i++;
+ /* MEM[reg2] = A */
+ s[i] = new_stmt(BPF_ST);
+ s[i]->s.k = reg2;
+ i++;
+ /* A = X */
+ s[i] = new_stmt(BPF_MISC|BPF_TXA);
+ i++;
+ /* A += 1 */
+ s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
+ s[i]->s.k = 1;
+ i++;
+ /* X = A */
+ s[i] = new_stmt(BPF_MISC|BPF_TAX);
+ i++;
+ /* A = P[X + packet head]; */
+ s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
+ s[i]->s.k = off_nl;
+ i++;
+ /* A += 1 */
+ s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
+ s[i]->s.k = 1;
+ i++;
+ /* A *= 8 */
+ s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
+ s[i]->s.k = 8;
+ i++;
+ /* X = A; */
+ s[i] = new_stmt(BPF_MISC|BPF_TAX);
+ i++;
+ /* A = MEM[reg2] */
+ s[i] = new_stmt(BPF_LD|BPF_MEM);
+ s[i]->s.k = reg2;
+ i++;
+
+ /* goto again; (must use BPF_JA for backward jump) */
+ s[i] = new_stmt(BPF_JMP|BPF_JA);
+ s[i]->s.k = again - i - 1;
+ s[i - 1]->s.jf = s[i];
+ i++;
+
+ /* fixup */
+ for (j = v6start; j <= v6end; j++)
+ s[j]->s.jt = s[v6advance];
+ } else
+#endif
+ {
+ /* nop */
+ s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
+ s[i]->s.k = 0;
+ s[fix2]->s.jf = s[i];
+ i++;
+ }
+
+ /* ahcheck: */
+ ahcheck = i;
+ /* if (A == IPPROTO_AH) then fall through; else goto end; */
+ s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
+ s[i]->s.jt = NULL; /*later*/
+ s[i]->s.jf = NULL; /*later*/
+ s[i]->s.k = IPPROTO_AH;
+ if (fix3)
+ s[fix3]->s.jf = s[ahcheck];
+ fix4 = i;
+ i++;
+
+ /*
+ * in short,
+ * A = P[X];
+ * X = X + (P[X + 1] + 2) * 4;
+ */
+ /* A = X */
+ s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
+ i++;
+ /* A = P[X + packet head]; */
+ s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
+ s[i]->s.k = off_nl;
+ i++;
+ /* MEM[reg2] = A */
+ s[i] = new_stmt(BPF_ST);
+ s[i]->s.k = reg2;
+ i++;
+ /* A = X */
+ s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
+ i++;
+ /* A += 1 */
+ s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
+ s[i]->s.k = 1;
+ i++;
+ /* X = A */
+ s[i] = new_stmt(BPF_MISC|BPF_TAX);
+ i++;
+ /* A = P[X + packet head] */
+ s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
+ s[i]->s.k = off_nl;
+ i++;
+ /* A += 2 */
+ s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
+ s[i]->s.k = 2;
+ i++;
+ /* A *= 4 */
+ s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
+ s[i]->s.k = 4;
+ i++;
+ /* X = A; */
+ s[i] = new_stmt(BPF_MISC|BPF_TAX);
+ i++;
+ /* A = MEM[reg2] */
+ s[i] = new_stmt(BPF_LD|BPF_MEM);
+ s[i]->s.k = reg2;
+ i++;
+
+ /* goto again; (must use BPF_JA for backward jump) */
+ s[i] = new_stmt(BPF_JMP|BPF_JA);
+ s[i]->s.k = again - i - 1;
+ i++;
+
+ /* end: nop */
+ end = i;
+ s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
+ s[i]->s.k = 0;
+ s[fix2]->s.jt = s[end];
+ s[fix4]->s.jf = s[end];
+ s[fix5]->s.jt = s[end];
+ i++;
+
+ /*
+ * make slist chain
+ */
+ max = i;
+ for (i = 0; i < max - 1; i++)
+ s[i]->next = s[i + 1];
+ s[max - 1]->next = NULL;
+
+ /*
+ * emit final check
+ */
+ b = new_block(JMP(BPF_JEQ));
+ b->stmts = s[1]; /*remember, s[0] is dummy*/
+ b->s.k = v;
+
+ free_reg(reg2);
+
+ gen_and(b0, b);
+ return b;
+#endif
+}
+
+static struct block *
+gen_proto(v, proto, dir)
+ int v;
+ int proto;
+ int dir;
+{
+ struct block *b0, *b1;
+
+ if (dir != Q_DEFAULT)
+ bpf_error("direction applied to 'proto'");
+
+ switch (proto) {
+ case Q_DEFAULT:
+#ifdef INET6
+ b0 = gen_proto(v, Q_IP, dir);
+ b1 = gen_proto(v, Q_IPV6, dir);
+ gen_or(b0, b1);
+ return b1;
+#else
+ /*FALLTHROUGH*/
+#endif
+ case Q_IP:
+ /*
+ * For FDDI, RFC 1188 says that SNAP encapsulation is used,
+ * not LLC encapsulation with LLCSAP_IP.
+ *
+ * For IEEE 802 networks - which includes 802.5 token ring
+ * (which is what DLT_IEEE802 means) and 802.11 - RFC 1042
+ * says that SNAP encapsulation is used, not LLC encapsulation
+ * with LLCSAP_IP.
+ *
+ * For LLC-encapsulated ATM/"Classical IP", RFC 1483 and
+ * RFC 2225 say that SNAP encapsulation is used, not LLC
+ * encapsulation with LLCSAP_IP.
+ *
+ * So we always check for ETHERTYPE_IP.
+ */
+ b0 = gen_linktype(ETHERTYPE_IP);
+#ifndef CHASE_CHAIN
+ b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
+#else
+ b1 = gen_protochain(v, Q_IP);
+#endif
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_ISO:
+ switch (linktype) {
+
+ case DLT_FRELAY:
+ /*
+ * Frame Relay packets typically have an OSI
+ * NLPID at the beginning; "gen_linktype(LLCSAP_ISONS)"
+ * generates code to check for all the OSI
+ * NLPIDs, so calling it and then adding a check
+ * for the particular NLPID for which we're
+ * looking is bogus, as we can just check for
+ * the NLPID.
+ *
+ * What we check for is the NLPID and a frame
+ * control field value of UI, i.e. 0x03 followed
+ * by the NLPID.
+ *
+ * XXX - assumes a 2-byte Frame Relay header with
+ * DLCI and flags. What if the address is longer?
+ *
+ * XXX - what about SNAP-encapsulated frames?
+ */
+ return gen_cmp(2, BPF_H, (0x03<<8) | v);
+ break;
+
+ case DLT_C_HDLC:
+ /*
+ * Cisco uses an Ethertype lookalike - for OSI,
+ * it's 0xfefe.
+ */
+ b0 = gen_linktype(LLCSAP_ISONS<<8 | LLCSAP_ISONS);
+ /* OSI in C-HDLC is stuffed with a fudge byte */
+ b1 = gen_cmp(off_nl_nosnap+1, BPF_B, (long)v);
+ gen_and(b0, b1);
+ return b1;
+
+ default:
+ b0 = gen_linktype(LLCSAP_ISONS);
+ b1 = gen_cmp(off_nl_nosnap, BPF_B, (long)v);
+ gen_and(b0, b1);
+ return b1;
+ }
+
+ case Q_ISIS:
+ b0 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
+ /*
+ * 4 is the offset of the PDU type relative to the IS-IS
+ * header.
+ */
+ b1 = gen_cmp(off_nl_nosnap+4, BPF_B, (long)v);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_ARP:
+ bpf_error("arp does not encapsulate another protocol");
+ /* NOTREACHED */
+
+ case Q_RARP:
+ bpf_error("rarp does not encapsulate another protocol");
+ /* NOTREACHED */
+
+ case Q_ATALK:
+ bpf_error("atalk encapsulation is not specifiable");
+ /* NOTREACHED */
+
+ case Q_DECNET:
+ bpf_error("decnet encapsulation is not specifiable");
+ /* NOTREACHED */
+
+ case Q_SCA:
+ bpf_error("sca does not encapsulate another protocol");
+ /* NOTREACHED */
+
+ case Q_LAT:
+ bpf_error("lat does not encapsulate another protocol");
+ /* NOTREACHED */
+
+ case Q_MOPRC:
+ bpf_error("moprc does not encapsulate another protocol");
+ /* NOTREACHED */
+
+ case Q_MOPDL:
+ bpf_error("mopdl does not encapsulate another protocol");
+ /* NOTREACHED */
+
+ case Q_LINK:
+ return gen_linktype(v);
+
+ case Q_UDP:
+ bpf_error("'udp proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_TCP:
+ bpf_error("'tcp proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_SCTP:
+ bpf_error("'sctp proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_ICMP:
+ bpf_error("'icmp proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_IGMP:
+ bpf_error("'igmp proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_IGRP:
+ bpf_error("'igrp proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_PIM:
+ bpf_error("'pim proto' is bogus");
+ /* NOTREACHED */
+
+ case Q_VRRP:
+ bpf_error("'vrrp proto' is bogus");
+ /* NOTREACHED */
+
+#ifdef INET6
+ case Q_IPV6:
+ b0 = gen_linktype(ETHERTYPE_IPV6);
+#ifndef CHASE_CHAIN
+ b1 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)v);
+#else
+ b1 = gen_protochain(v, Q_IPV6);
+#endif
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_ICMPV6:
+ bpf_error("'icmp6 proto' is bogus");
+#endif /* INET6 */
+
+ case Q_AH:
+ bpf_error("'ah proto' is bogus");
+
+ case Q_ESP:
+ bpf_error("'ah proto' is bogus");
+
+ case Q_STP:
+ bpf_error("'stp proto' is bogus");
+
+ case Q_IPX:
+ bpf_error("'ipx proto' is bogus");
+
+ case Q_NETBEUI:
+ bpf_error("'netbeui proto' is bogus");
+
+ default:
+ abort();
+ /* NOTREACHED */
+ }
+ /* NOTREACHED */
+}
+
+struct block *
+gen_scode(name, q)
+ register const char *name;
+ struct qual q;
+{
+ int proto = q.proto;
+ int dir = q.dir;
+ int tproto;
+ u_char *eaddr;
+ bpf_u_int32 mask, addr;
+#ifndef INET6
+ bpf_u_int32 **alist;
+#else
+ int tproto6;
+ struct sockaddr_in *sin;
+ struct sockaddr_in6 *sin6;
+ struct addrinfo *res, *res0;
+ struct in6_addr mask128;
+#endif /*INET6*/
+ struct block *b, *tmp;
+ int port, real_proto;
+
+ switch (q.addr) {
+
+ case Q_NET:
+ addr = pcap_nametonetaddr(name);
+ if (addr == 0)
+ bpf_error("unknown network '%s'", name);
+ /* Left justify network addr and calculate its network mask */
+ mask = 0xffffffff;
+ while (addr && (addr & 0xff000000) == 0) {
+ addr <<= 8;
+ mask <<= 8;
+ }
+ return gen_host(addr, mask, proto, dir);
+
+ case Q_DEFAULT:
+ case Q_HOST:
+ if (proto == Q_LINK) {
+ switch (linktype) {
+
+ case DLT_EN10MB:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown ether host '%s'", name);
+ b = gen_ehostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_FDDI:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown FDDI host '%s'", name);
+ b = gen_fhostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_IEEE802:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown token ring host '%s'", name);
+ b = gen_thostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_IEEE802_11:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown 802.11 host '%s'", name);
+ b = gen_wlanhostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_IP_OVER_FC:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown Fibre Channel host '%s'", name);
+ b = gen_ipfchostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_SUNATM:
+ if (!is_lane)
+ break;
+
+ /*
+ * Check that the packet doesn't begin
+ * with an LE Control marker. (We've
+ * already generated a test for LANE.)
+ */
+ tmp = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
+ gen_not(tmp);
+
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown ether host '%s'", name);
+ b = gen_ehostop(eaddr, dir);
+ gen_and(tmp, b);
+ free(eaddr);
+ return b;
+ }
+
+ bpf_error("only ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel supports link-level host name");
+ } else if (proto == Q_DECNET) {
+ unsigned short dn_addr = __pcap_nametodnaddr(name);
+ /*
+ * I don't think DECNET hosts can be multihomed, so
+ * there is no need to build up a list of addresses
+ */
+ return (gen_host(dn_addr, 0, proto, dir));
+ } else {
+#ifndef INET6
+ alist = pcap_nametoaddr(name);
+ if (alist == NULL || *alist == NULL)
+ bpf_error("unknown host '%s'", name);
+ tproto = proto;
+ if (off_linktype == -1 && tproto == Q_DEFAULT)
+ tproto = Q_IP;
+ b = gen_host(**alist++, 0xffffffff, tproto, dir);
+ while (*alist) {
+ tmp = gen_host(**alist++, 0xffffffff,
+ tproto, dir);
+ gen_or(b, tmp);
+ b = tmp;
+ }
+ return b;
+#else
+ memset(&mask128, 0xff, sizeof(mask128));
+ res0 = res = pcap_nametoaddrinfo(name);
+ if (res == NULL)
+ bpf_error("unknown host '%s'", name);
+ b = tmp = NULL;
+ tproto = tproto6 = proto;
+ if (off_linktype == -1 && tproto == Q_DEFAULT) {
+ tproto = Q_IP;
+ tproto6 = Q_IPV6;
+ }
+ for (res = res0; res; res = res->ai_next) {
+ switch (res->ai_family) {
+ case AF_INET:
+ if (tproto == Q_IPV6)
+ continue;
+
+ sin = (struct sockaddr_in *)
+ res->ai_addr;
+ tmp = gen_host(ntohl(sin->sin_addr.s_addr),
+ 0xffffffff, tproto, dir);
+ break;
+ case AF_INET6:
+ if (tproto6 == Q_IP)
+ continue;
+
+ sin6 = (struct sockaddr_in6 *)
+ res->ai_addr;
+ tmp = gen_host6(&sin6->sin6_addr,
+ &mask128, tproto6, dir);
+ break;
+ default:
+ continue;
+ }
+ if (b)
+ gen_or(b, tmp);
+ b = tmp;
+ }
+ freeaddrinfo(res0);
+ if (b == NULL) {
+ bpf_error("unknown host '%s'%s", name,
+ (proto == Q_DEFAULT)
+ ? ""
+ : " for specified address family");
+ }
+ return b;
+#endif /*INET6*/
+ }
+
+ case Q_PORT:
+ if (proto != Q_DEFAULT &&
+ proto != Q_UDP && proto != Q_TCP && proto != Q_SCTP)
+ bpf_error("illegal qualifier of 'port'");
+ if (pcap_nametoport(name, &port, &real_proto) == 0)
+ bpf_error("unknown port '%s'", name);
+ if (proto == Q_UDP) {
+ if (real_proto == IPPROTO_TCP)
+ bpf_error("port '%s' is tcp", name);
+ else if (real_proto == IPPROTO_SCTP)
+ bpf_error("port '%s' is sctp", name);
+ else
+ /* override PROTO_UNDEF */
+ real_proto = IPPROTO_UDP;
+ }
+ if (proto == Q_TCP) {
+ if (real_proto == IPPROTO_UDP)
+ bpf_error("port '%s' is udp", name);
+
+ else if (real_proto == IPPROTO_SCTP)
+ bpf_error("port '%s' is sctp", name);
+ else
+ /* override PROTO_UNDEF */
+ real_proto = IPPROTO_TCP;
+ }
+ if (proto == Q_SCTP) {
+ if (real_proto == IPPROTO_UDP)
+ bpf_error("port '%s' is udp", name);
+
+ else if (real_proto == IPPROTO_TCP)
+ bpf_error("port '%s' is tcp", name);
+ else
+ /* override PROTO_UNDEF */
+ real_proto = IPPROTO_SCTP;
+ }
+#ifndef INET6
+ return gen_port(port, real_proto, dir);
+#else
+ {
+ struct block *b;
+ b = gen_port(port, real_proto, dir);
+ gen_or(gen_port6(port, real_proto, dir), b);
+ return b;
+ }
+#endif /* INET6 */
+
+ case Q_GATEWAY:
+#ifndef INET6
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error("unknown ether host: %s", name);
+
+ alist = pcap_nametoaddr(name);
+ if (alist == NULL || *alist == NULL)
+ bpf_error("unknown host '%s'", name);
+ b = gen_gateway(eaddr, alist, proto, dir);
+ free(eaddr);
+ return b;
+#else
+ bpf_error("'gateway' not supported in this configuration");
+#endif /*INET6*/
+
+ case Q_PROTO:
+ real_proto = lookup_proto(name, proto);
+ if (real_proto >= 0)
+ return gen_proto(real_proto, proto, dir);
+ else
+ bpf_error("unknown protocol: %s", name);
+
+ case Q_PROTOCHAIN:
+ real_proto = lookup_proto(name, proto);
+ if (real_proto >= 0)
+ return gen_protochain(real_proto, proto, dir);
+ else
+ bpf_error("unknown protocol: %s", name);
+
+
+ case Q_UNDEF:
+ syntax();
+ /* NOTREACHED */
+ }
+ abort();
+ /* NOTREACHED */
+}
+
+struct block *
+gen_mcode(s1, s2, masklen, q)
+ register const char *s1, *s2;
+ register int masklen;
+ struct qual q;
+{
+ register int nlen, mlen;
+ bpf_u_int32 n, m;
+
+ nlen = __pcap_atoin(s1, &n);
+ /* Promote short ipaddr */
+ n <<= 32 - nlen;
+
+ if (s2 != NULL) {
+ mlen = __pcap_atoin(s2, &m);
+ /* Promote short ipaddr */
+ m <<= 32 - mlen;
+ if ((n & ~m) != 0)
+ bpf_error("non-network bits set in \"%s mask %s\"",
+ s1, s2);
+ } else {
+ /* Convert mask len to mask */
+ if (masklen > 32)
+ bpf_error("mask length must be <= 32");
+ m = 0xffffffff << (32 - masklen);
+ if ((n & ~m) != 0)
+ bpf_error("non-network bits set in \"%s/%d\"",
+ s1, masklen);
+ }
+
+ switch (q.addr) {
+
+ case Q_NET:
+ return gen_host(n, m, q.proto, q.dir);
+
+ default:
+ bpf_error("Mask syntax for networks only");
+ /* NOTREACHED */
+ }
+}
+
+struct block *
+gen_ncode(s, v, q)
+ register const char *s;
+ bpf_u_int32 v;
+ struct qual q;
+{
+ bpf_u_int32 mask;
+ int proto = q.proto;
+ int dir = q.dir;
+ register int vlen;
+
+ if (s == NULL)
+ vlen = 32;
+ else if (q.proto == Q_DECNET)
+ vlen = __pcap_atodn(s, &v);
+ else
+ vlen = __pcap_atoin(s, &v);
+
+ switch (q.addr) {
+
+ case Q_DEFAULT:
+ case Q_HOST:
+ case Q_NET:
+ if (proto == Q_DECNET)
+ return gen_host(v, 0, proto, dir);
+ else if (proto == Q_LINK) {
+ bpf_error("illegal link layer address");
+ } else {
+ mask = 0xffffffff;
+ if (s == NULL && q.addr == Q_NET) {
+ /* Promote short net number */
+ while (v && (v & 0xff000000) == 0) {
+ v <<= 8;
+ mask <<= 8;
+ }
+ } else {
+ /* Promote short ipaddr */
+ v <<= 32 - vlen;
+ mask <<= 32 - vlen;
+ }
+ return gen_host(v, mask, proto, dir);
+ }
+
+ case Q_PORT:
+ if (proto == Q_UDP)
+ proto = IPPROTO_UDP;
+ else if (proto == Q_TCP)
+ proto = IPPROTO_TCP;
+ else if (proto == Q_SCTP)
+ proto = IPPROTO_SCTP;
+ else if (proto == Q_DEFAULT)
+ proto = PROTO_UNDEF;
+ else
+ bpf_error("illegal qualifier of 'port'");
+
+#ifndef INET6
+ return gen_port((int)v, proto, dir);
+#else
+ {
+ struct block *b;
+ b = gen_port((int)v, proto, dir);
+ gen_or(gen_port6((int)v, proto, dir), b);
+ return b;
+ }
+#endif /* INET6 */
+
+ case Q_GATEWAY:
+ bpf_error("'gateway' requires a name");
+ /* NOTREACHED */
+
+ case Q_PROTO:
+ return gen_proto((int)v, proto, dir);
+
+ case Q_PROTOCHAIN:
+ return gen_protochain((int)v, proto, dir);
+
+ case Q_UNDEF:
+ syntax();
+ /* NOTREACHED */
+
+ default:
+ abort();
+ /* NOTREACHED */
+ }
+ /* NOTREACHED */
+}
+
+#ifdef INET6
+struct block *
+gen_mcode6(s1, s2, masklen, q)
+ register const char *s1, *s2;
+ register int masklen;
+ struct qual q;
+{
+ struct addrinfo *res;
+ struct in6_addr *addr;
+ struct in6_addr mask;
+ struct block *b;
+ u_int32_t *a, *m;
+
+ if (s2)
+ bpf_error("no mask %s supported", s2);
+
+ res = pcap_nametoaddrinfo(s1);
+ if (!res)
+ bpf_error("invalid ip6 address %s", s1);
+ if (res->ai_next)
+ bpf_error("%s resolved to multiple address", s1);
+ addr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
+
+ if (sizeof(mask) * 8 < masklen)
+ bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8));
+ memset(&mask, 0, sizeof(mask));
+ memset(&mask, 0xff, masklen / 8);
+ if (masklen % 8) {
+ mask.s6_addr[masklen / 8] =
+ (0xff << (8 - masklen % 8)) & 0xff;
+ }
+
+ a = (u_int32_t *)addr;
+ m = (u_int32_t *)&mask;
+ if ((a[0] & ~m[0]) || (a[1] & ~m[1])
+ || (a[2] & ~m[2]) || (a[3] & ~m[3])) {
+ bpf_error("non-network bits set in \"%s/%d\"", s1, masklen);
+ }
- /*
- * in short,
- * A = P[X + 1];
- * X = X + (P[X] + 1) * 8;
- */
- /* A = X */
- s[i] = new_stmt(BPF_MISC|BPF_TXA);
- i++;
- /* MEM[reg1] = A */
- s[i] = new_stmt(BPF_ST);
- s[i]->s.k = reg1;
- i++;
- /* A += 1 */
- s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
- s[i]->s.k = 1;
- i++;
- /* X = A */
- s[i] = new_stmt(BPF_MISC|BPF_TAX);
- i++;
- /* A = P[X + packet head]; */
- s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
- i++;
- /* MEM[reg2] = A */
- s[i] = new_stmt(BPF_ST);
- s[i]->s.k = reg2;
- i++;
- /* X = MEM[reg1] */
- s[i] = new_stmt(BPF_LDX|BPF_MEM);
- s[i]->s.k = reg1;
- i++;
- /* A = P[X + packet head] */
- s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
- i++;
- /* A += 1 */
- s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
- s[i]->s.k = 1;
- i++;
- /* A *= 8 */
- s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
- s[i]->s.k = 8;
- i++;
- /* X = A; */
- s[i] = new_stmt(BPF_MISC|BPF_TAX);
- i++;
- /* A = MEM[reg2] */
- s[i] = new_stmt(BPF_LD|BPF_MEM);
- s[i]->s.k = reg2;
- i++;
+ switch (q.addr) {
- /* goto again; (must use BPF_JA for backward jump) */
- s[i] = new_stmt(BPF_JMP|BPF_JA);
- s[i]->s.k = again - i - 1;
- s[i - 1]->s.jf = s[i];
- i++;
+ case Q_DEFAULT:
+ case Q_HOST:
+ if (masklen != 128)
+ bpf_error("Mask syntax for networks only");
+ /* FALLTHROUGH */
- /* fixup */
- for (j = v6start; j <= v6end; j++)
- s[j]->s.jt = s[v6advance];
- } else
-#endif
- {
- /* nop */
- s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
- s[i]->s.k = 0;
- s[fix2]->s.jf = s[i];
- i++;
- }
+ case Q_NET:
+ b = gen_host6(addr, &mask, q.proto, q.dir);
+ freeaddrinfo(res);
+ return b;
- /* ahcheck: */
- ahcheck = i;
- /* if (A == IPPROTO_AH) then fall through; else goto end; */
- s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
- s[i]->s.jt = NULL; /*later*/
- s[i]->s.jf = NULL; /*later*/
- s[i]->s.k = IPPROTO_AH;
- if (fix3)
- s[fix3]->s.jf = s[ahcheck];
- fix4 = i;
- i++;
+ default:
+ bpf_error("invalid qualifier against IPv6 address");
+ /* NOTREACHED */
+ }
+}
+#endif /*INET6*/
- /*
- * in short,
- * A = P[X + 1];
- * X = X + (P[X] + 2) * 4;
- */
- /* A = X */
- s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
- i++;
- /* MEM[reg1] = A */
- s[i] = new_stmt(BPF_ST);
- s[i]->s.k = reg1;
- i++;
- /* A += 1 */
- s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
- s[i]->s.k = 1;
- i++;
- /* X = A */
- s[i] = new_stmt(BPF_MISC|BPF_TAX);
- i++;
- /* A = P[X + packet head]; */
- s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
- i++;
- /* MEM[reg2] = A */
- s[i] = new_stmt(BPF_ST);
- s[i]->s.k = reg2;
- i++;
- /* X = MEM[reg1] */
- s[i] = new_stmt(BPF_LDX|BPF_MEM);
- s[i]->s.k = reg1;
- i++;
- /* A = P[X + packet head] */
- s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
- i++;
- /* A += 2 */
- s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
- s[i]->s.k = 2;
- i++;
- /* A *= 4 */
- s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
- s[i]->s.k = 4;
- i++;
- /* X = A; */
- s[i] = new_stmt(BPF_MISC|BPF_TAX);
- i++;
- /* A = MEM[reg2] */
- s[i] = new_stmt(BPF_LD|BPF_MEM);
- s[i]->s.k = reg2;
- i++;
+struct block *
+gen_ecode(eaddr, q)
+ register const u_char *eaddr;
+ struct qual q;
+{
+ struct block *b, *tmp;
- /* goto again; (must use BPF_JA for backward jump) */
- s[i] = new_stmt(BPF_JMP|BPF_JA);
- s[i]->s.k = again - i - 1;
- i++;
+ if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) {
+ if (linktype == DLT_EN10MB)
+ return gen_ehostop(eaddr, (int)q.dir);
+ if (linktype == DLT_FDDI)
+ return gen_fhostop(eaddr, (int)q.dir);
+ if (linktype == DLT_IEEE802)
+ return gen_thostop(eaddr, (int)q.dir);
+ if (linktype == DLT_IEEE802_11)
+ return gen_wlanhostop(eaddr, (int)q.dir);
+ if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ tmp = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(tmp);
- /* end: nop */
- end = i;
- s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
- s[i]->s.k = 0;
- s[fix2]->s.jt = s[end];
- s[fix4]->s.jf = s[end];
- s[fix5]->s.jt = s[end];
- i++;
+ /*
+ * Now check the MAC address.
+ */
+ b = gen_ehostop(eaddr, (int)q.dir);
+ gen_and(tmp, b);
+ return b;
+ }
+ if (linktype == DLT_IP_OVER_FC)
+ return gen_ipfchostop(eaddr, (int)q.dir);
+ bpf_error("ethernet addresses supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel");
+ }
+ bpf_error("ethernet address used in non-ether expression");
+ /* NOTREACHED */
+}
+void
+sappend(s0, s1)
+ struct slist *s0, *s1;
+{
/*
- * make slist chain
+ * This is definitely not the best way to do this, but the
+ * lists will rarely get long.
*/
- max = i;
- for (i = 0; i < max - 1; i++)
- s[i]->next = s[i + 1];
- s[max - 1]->next = NULL;
+ while (s0->next)
+ s0 = s0->next;
+ s0->next = s1;
+}
- /*
- * emit final check
- */
- b = new_block(JMP(BPF_JEQ));
- b->stmts = s[1]; /*remember, s[0] is dummy*/
- b->s.k = v;
+static struct slist *
+xfer_to_x(a)
+ struct arth *a;
+{
+ struct slist *s;
- free_reg(reg1);
- free_reg(reg2);
+ s = new_stmt(BPF_LDX|BPF_MEM);
+ s->s.k = a->regno;
+ return s;
+}
- gen_and(b0, b);
- return b;
-#endif
+static struct slist *
+xfer_to_a(a)
+ struct arth *a;
+{
+ struct slist *s;
+
+ s = new_stmt(BPF_LD|BPF_MEM);
+ s->s.k = a->regno;
+ return s;
}
-static struct block *
-gen_proto(v, proto, dir)
- int v;
+struct arth *
+gen_load(proto, index, size)
int proto;
- int dir;
+ struct arth *index;
+ int size;
{
- struct block *b0, *b1;
+ struct slist *s, *tmp;
+ struct block *b;
+ int regno = alloc_reg();
- if (dir != Q_DEFAULT)
- bpf_error("direction applied to 'proto'");
+ free_reg(index->regno);
+ switch (size) {
+
+ default:
+ bpf_error("data size must be 1, 2, or 4");
+
+ case 1:
+ size = BPF_B;
+ break;
+
+ case 2:
+ size = BPF_H;
+ break;
+
+ case 4:
+ size = BPF_W;
+ break;
+ }
+ switch (proto) {
+ default:
+ bpf_error("unsupported index operation");
+
+ case Q_LINK:
+ /*
+ * XXX - what about ATM LANE? Should the index be
+ * relative to the beginning of the AAL5 frame, so
+ * that 0 refers to the beginning of the LE Control
+ * field, or relative to the beginning of the LAN
+ * frame, so that 0 refers, for Ethernet LANE, to
+ * the beginning of the destination address?
+ */
+ s = xfer_to_x(index);
+ tmp = new_stmt(BPF_LD|BPF_IND|size);
+ sappend(s, tmp);
+ sappend(index->s, s);
+ break;
- switch (proto) {
- case Q_DEFAULT:
-#ifdef INET6
- b0 = gen_proto(v, Q_IP, dir);
- b1 = gen_proto(v, Q_IPV6, dir);
- gen_or(b0, b1);
- return b1;
-#else
- /*FALLTHROUGH*/
-#endif
case Q_IP:
- b0 = gen_linktype(ETHERTYPE_IP);
-#ifndef CHASE_CHAIN
- b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
-#else
- b1 = gen_protochain(v, Q_IP);
-#endif
- gen_and(b0, b1);
- return b1;
-
case Q_ARP:
- bpf_error("arp does not encapsulate another protocol");
- /* NOTREACHED */
-
case Q_RARP:
- bpf_error("rarp does not encapsulate another protocol");
- /* NOTREACHED */
-
case Q_ATALK:
- bpf_error("atalk encapsulation is not specifiable");
- /* NOTREACHED */
-
case Q_DECNET:
- bpf_error("decnet encapsulation is not specifiable");
- /* NOTREACHED */
-
case Q_SCA:
- bpf_error("sca does not encapsulate another protocol");
- /* NOTREACHED */
-
case Q_LAT:
- bpf_error("lat does not encapsulate another protocol");
- /* NOTREACHED */
-
case Q_MOPRC:
- bpf_error("moprc does not encapsulate another protocol");
- /* NOTREACHED */
-
case Q_MOPDL:
- bpf_error("mopdl does not encapsulate another protocol");
- /* NOTREACHED */
-
- case Q_LINK:
- return gen_linktype(v);
+#ifdef INET6
+ case Q_IPV6:
+#endif
+ /* XXX Note that we assume a fixed link header here. */
+ s = xfer_to_x(index);
+ tmp = new_stmt(BPF_LD|BPF_IND|size);
+ tmp->s.k = off_nl;
+ sappend(s, tmp);
+ sappend(index->s, s);
- case Q_UDP:
- bpf_error("'udp proto' is bogus");
- /* NOTREACHED */
+ b = gen_proto_abbrev(proto);
+ if (index->b)
+ gen_and(index->b, b);
+ index->b = b;
+ break;
+ case Q_SCTP:
case Q_TCP:
- bpf_error("'tcp proto' is bogus");
- /* NOTREACHED */
-
+ case Q_UDP:
case Q_ICMP:
- bpf_error("'icmp proto' is bogus");
- /* NOTREACHED */
-
case Q_IGMP:
- bpf_error("'igmp proto' is bogus");
- /* NOTREACHED */
-
case Q_IGRP:
- bpf_error("'igrp proto' is bogus");
- /* NOTREACHED */
-
case Q_PIM:
- bpf_error("'pim proto' is bogus");
- /* NOTREACHED */
+ case Q_VRRP:
+ s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
+ s->s.k = off_nl;
+ sappend(s, xfer_to_a(index));
+ sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
+ sappend(s, new_stmt(BPF_MISC|BPF_TAX));
+ sappend(s, tmp = new_stmt(BPF_LD|BPF_IND|size));
+ tmp->s.k = off_nl;
+ sappend(index->s, s);
+ gen_and(gen_proto_abbrev(proto), b = gen_ipfrag());
+ if (index->b)
+ gen_and(index->b, b);
#ifdef INET6
- case Q_IPV6:
- b0 = gen_linktype(ETHERTYPE_IPV6);
-#ifndef CHASE_CHAIN
- b1 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)v);
-#else
- b1 = gen_protochain(v, Q_IPV6);
+ gen_and(gen_proto_abbrev(Q_IP), b);
#endif
- gen_and(b0, b1);
- return b1;
-
- case Q_ICMPV6:
- bpf_error("'icmp6 proto' is bogus");
-#endif /* INET6 */
-
- case Q_AH:
- bpf_error("'ah proto' is bogus");
-
- case Q_ESP:
- bpf_error("'ah proto' is bogus");
-
- default:
- abort();
- /* NOTREACHED */
- }
- /* NOTREACHED */
-}
-
-struct block *
-gen_scode(name, q)
- register const char *name;
- struct qual q;
-{
- int proto = q.proto;
- int dir = q.dir;
- int tproto;
- u_char *eaddr;
- bpf_u_int32 mask, addr, **alist;
+ index->b = b;
+ break;
#ifdef INET6
- int tproto6;
- struct sockaddr_in *sin;
- struct sockaddr_in6 *sin6;
- struct addrinfo *res, *res0;
- struct in6_addr mask128;
-#endif /*INET6*/
- struct block *b, *tmp;
- int port, real_proto;
-
- switch (q.addr) {
-
- case Q_NET:
- addr = pcap_nametonetaddr(name);
- if (addr == 0)
- bpf_error("unknown network '%s'", name);
- /* Left justify network addr and calculate its network mask */
- mask = 0xffffffff;
- while (addr && (addr & 0xff000000) == 0) {
- addr <<= 8;
- mask <<= 8;
- }
- return gen_host(addr, mask, proto, dir);
-
- case Q_DEFAULT:
- case Q_HOST:
- if (proto == Q_LINK) {
- switch (linktype) {
-
- case DLT_EN10MB:
- eaddr = pcap_ether_hostton(name);
- if (eaddr == NULL)
- bpf_error(
- "unknown ether host '%s'", name);
- return gen_ehostop(eaddr, dir);
-
- case DLT_FDDI:
- eaddr = pcap_ether_hostton(name);
- if (eaddr == NULL)
- bpf_error(
- "unknown FDDI host '%s'", name);
- return gen_fhostop(eaddr, dir);
-
- default:
- bpf_error(
- "only ethernet/FDDI supports link-level host name");
- break;
- }
- } else if (proto == Q_DECNET) {
- unsigned short dn_addr = __pcap_nametodnaddr(name);
- /*
- * I don't think DECNET hosts can be multihomed, so
- * there is no need to build up a list of addresses
- */
- return (gen_host(dn_addr, 0, proto, dir));
- } else {
-#ifndef INET6
- alist = pcap_nametoaddr(name);
- if (alist == NULL || *alist == NULL)
- bpf_error("unknown host '%s'", name);
- tproto = proto;
- if (off_linktype == -1 && tproto == Q_DEFAULT)
- tproto = Q_IP;
- b = gen_host(**alist++, 0xffffffff, tproto, dir);
- while (*alist) {
- tmp = gen_host(**alist++, 0xffffffff,
- tproto, dir);
- gen_or(b, tmp);
- b = tmp;
- }
- return b;
-#else
- memset(&mask128, 0xff, sizeof(mask128));
- res0 = res = pcap_nametoaddr(name);
- if (res == NULL)
- bpf_error("unknown host '%s'", name);
- b = tmp = NULL;
- tproto = tproto6 = proto;
- if (off_linktype == -1 && tproto == Q_DEFAULT) {
- tproto = Q_IP;
- tproto6 = Q_IPV6;
- }
- while (res) {
- switch (res->ai_family) {
- case AF_INET:
- sin = (struct sockaddr_in *)
- res->ai_addr;
- tmp = gen_host(ntohl(sin->sin_addr.s_addr),
- 0xffffffff, tproto, dir);
- break;
- case AF_INET6:
- sin6 = (struct sockaddr_in6 *)
- res->ai_addr;
- tmp = gen_host6(&sin6->sin6_addr,
- &mask128, tproto6, dir);
- break;
- }
- if (b)
- gen_or(b, tmp);
- b = tmp;
-
- res = res->ai_next;
- }
- freeaddrinfo(res0);
- return b;
-#endif /*INET6*/
- }
-
- case Q_PORT:
- if (proto != Q_DEFAULT && proto != Q_UDP && proto != Q_TCP)
- bpf_error("illegal qualifier of 'port'");
- if (pcap_nametoport(name, &port, &real_proto) == 0)
- bpf_error("unknown port '%s'", name);
- if (proto == Q_UDP) {
- if (real_proto == IPPROTO_TCP)
- bpf_error("port '%s' is tcp", name);
- else
- /* override PROTO_UNDEF */
- real_proto = IPPROTO_UDP;
- }
- if (proto == Q_TCP) {
- if (real_proto == IPPROTO_UDP)
- bpf_error("port '%s' is udp", name);
- else
- /* override PROTO_UNDEF */
- real_proto = IPPROTO_TCP;
- }
-#ifndef INET6
- return gen_port(port, real_proto, dir);
-#else
- {
- struct block *b;
- b = gen_port(port, real_proto, dir);
- gen_or(gen_port6(port, real_proto, dir), b);
- return b;
- }
-#endif /* INET6 */
+ case Q_ICMPV6:
+ bpf_error("IPv6 upper-layer protocol is not supported by proto[x]");
+ /*NOTREACHED*/
+#endif
+ }
+ index->regno = regno;
+ s = new_stmt(BPF_ST);
+ s->s.k = regno;
+ sappend(index->s, s);
- case Q_GATEWAY:
-#ifndef INET6
- eaddr = pcap_ether_hostton(name);
- if (eaddr == NULL)
- bpf_error("unknown ether host: %s", name);
+ return index;
+}
- alist = pcap_nametoaddr(name);
- if (alist == NULL || *alist == NULL)
- bpf_error("unknown host '%s'", name);
- return gen_gateway(eaddr, alist, proto, dir);
-#else
- bpf_error("'gateway' not supported in this configuration");
-#endif /*INET6*/
+struct block *
+gen_relation(code, a0, a1, reversed)
+ int code;
+ struct arth *a0, *a1;
+ int reversed;
+{
+ struct slist *s0, *s1, *s2;
+ struct block *b, *tmp;
- case Q_PROTO:
- real_proto = lookup_proto(name, proto);
- if (real_proto >= 0)
- return gen_proto(real_proto, proto, dir);
- else
- bpf_error("unknown protocol: %s", name);
+ s0 = xfer_to_x(a1);
+ s1 = xfer_to_a(a0);
+ if (code == BPF_JEQ) {
+ s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X);
+ b = new_block(JMP(code));
+ sappend(s1, s2);
+ }
+ else
+ b = new_block(BPF_JMP|code|BPF_X);
+ if (reversed)
+ gen_not(b);
- case Q_PROTOCHAIN:
- real_proto = lookup_proto(name, proto);
- if (real_proto >= 0)
- return gen_protochain(real_proto, proto, dir);
+ sappend(s0, s1);
+ sappend(a1->s, s0);
+ sappend(a0->s, a1->s);
+
+ b->stmts = a0->s;
+
+ free_reg(a0->regno);
+ free_reg(a1->regno);
+
+ /* 'and' together protocol checks */
+ if (a0->b) {
+ if (a1->b) {
+ gen_and(a0->b, tmp = a1->b);
+ }
else
- bpf_error("unknown protocol: %s", name);
+ tmp = a0->b;
+ } else
+ tmp = a1->b;
+ if (tmp)
+ gen_and(tmp, b);
- case Q_UNDEF:
- syntax();
- /* NOTREACHED */
- }
- abort();
- /* NOTREACHED */
+ return b;
}
-struct block *
-gen_mcode(s1, s2, masklen, q)
- register const char *s1, *s2;
- register int masklen;
- struct qual q;
+struct arth *
+gen_loadlen()
{
- register int nlen, mlen;
- bpf_u_int32 n, m;
+ int regno = alloc_reg();
+ struct arth *a = (struct arth *)newchunk(sizeof(*a));
+ struct slist *s;
- nlen = __pcap_atoin(s1, &n);
- /* Promote short ipaddr */
- n <<= 32 - nlen;
+ s = new_stmt(BPF_LD|BPF_LEN);
+ s->next = new_stmt(BPF_ST);
+ s->next->s.k = regno;
+ a->s = s;
+ a->regno = regno;
- if (s2 != NULL) {
- mlen = __pcap_atoin(s2, &m);
- /* Promote short ipaddr */
- m <<= 32 - mlen;
- if ((n & ~m) != 0)
- bpf_error("non-network bits set in \"%s mask %s\"",
- s1, s2);
- } else {
- /* Convert mask len to mask */
- if (masklen > 32)
- bpf_error("mask length must be <= 32");
- m = 0xffffffff << (32 - masklen);
- if ((n & ~m) != 0)
- bpf_error("non-network bits set in \"%s/%d\"",
- s1, masklen);
- }
+ return a;
+}
- switch (q.addr) {
+struct arth *
+gen_loadi(val)
+ int val;
+{
+ struct arth *a;
+ struct slist *s;
+ int reg;
- case Q_NET:
- return gen_host(n, m, q.proto, q.dir);
+ a = (struct arth *)newchunk(sizeof(*a));
- default:
- bpf_error("Mask syntax for networks only");
- /* NOTREACHED */
- }
+ reg = alloc_reg();
+
+ s = new_stmt(BPF_LD|BPF_IMM);
+ s->s.k = val;
+ s->next = new_stmt(BPF_ST);
+ s->next->s.k = reg;
+ a->s = s;
+ a->regno = reg;
+
+ return a;
}
-struct block *
-gen_ncode(s, v, q)
- register const char *s;
- bpf_u_int32 v;
- struct qual q;
+struct arth *
+gen_neg(a)
+ struct arth *a;
{
- bpf_u_int32 mask;
- int proto = q.proto;
- int dir = q.dir;
- register int vlen;
+ struct slist *s;
- if (s == NULL)
- vlen = 32;
- else if (q.proto == Q_DECNET)
- vlen = __pcap_atodn(s, &v);
- else
- vlen = __pcap_atoin(s, &v);
+ s = xfer_to_a(a);
+ sappend(a->s, s);
+ s = new_stmt(BPF_ALU|BPF_NEG);
+ s->s.k = 0;
+ sappend(a->s, s);
+ s = new_stmt(BPF_ST);
+ s->s.k = a->regno;
+ sappend(a->s, s);
- switch (q.addr) {
+ return a;
+}
- case Q_DEFAULT:
- case Q_HOST:
- case Q_NET:
- if (proto == Q_DECNET)
- return gen_host(v, 0, proto, dir);
- else if (proto == Q_LINK) {
- bpf_error("illegal link layer address");
- } else {
- mask = 0xffffffff;
- if (s == NULL && q.addr == Q_NET) {
- /* Promote short net number */
- while (v && (v & 0xff000000) == 0) {
- v <<= 8;
- mask <<= 8;
- }
- } else {
- /* Promote short ipaddr */
- v <<= 32 - vlen;
- mask <<= 32 - vlen;
- }
- return gen_host(v, mask, proto, dir);
- }
+struct arth *
+gen_arth(code, a0, a1)
+ int code;
+ struct arth *a0, *a1;
+{
+ struct slist *s0, *s1, *s2;
- case Q_PORT:
- if (proto == Q_UDP)
- proto = IPPROTO_UDP;
- else if (proto == Q_TCP)
- proto = IPPROTO_TCP;
- else if (proto == Q_DEFAULT)
- proto = PROTO_UNDEF;
- else
- bpf_error("illegal qualifier of 'port'");
+ s0 = xfer_to_x(a1);
+ s1 = xfer_to_a(a0);
+ s2 = new_stmt(BPF_ALU|BPF_X|code);
-#ifndef INET6
- return gen_port((int)v, proto, dir);
-#else
- {
- struct block *b;
- b = gen_port((int)v, proto, dir);
- gen_or(gen_port6((int)v, proto, dir), b);
- return b;
- }
-#endif /* INET6 */
+ sappend(s1, s2);
+ sappend(s0, s1);
+ sappend(a1->s, s0);
+ sappend(a0->s, a1->s);
- case Q_GATEWAY:
- bpf_error("'gateway' requires a name");
- /* NOTREACHED */
+ free_reg(a0->regno);
+ free_reg(a1->regno);
+
+ s0 = new_stmt(BPF_ST);
+ a0->regno = s0->s.k = alloc_reg();
+ sappend(a0->s, s0);
+
+ return a0;
+}
+
+/*
+ * Here we handle simple allocation of the scratch registers.
+ * If too many registers are alloc'd, the allocator punts.
+ */
+static int regused[BPF_MEMWORDS];
+static int curreg;
+
+/*
+ * Return the next free register.
+ */
+static int
+alloc_reg()
+{
+ int n = BPF_MEMWORDS;
+
+ while (--n >= 0) {
+ if (regused[curreg])
+ curreg = (curreg + 1) % BPF_MEMWORDS;
+ else {
+ regused[curreg] = 1;
+ return curreg;
+ }
+ }
+ bpf_error("too many registers needed to evaluate expression");
+ /* NOTREACHED */
+}
- case Q_PROTO:
- return gen_proto((int)v, proto, dir);
+/*
+ * Return a register to the table so it can
+ * be used later.
+ */
+static void
+free_reg(n)
+ int n;
+{
+ regused[n] = 0;
+}
- case Q_PROTOCHAIN:
- return gen_protochain((int)v, proto, dir);
+static struct block *
+gen_len(jmp, n)
+ int jmp, n;
+{
+ struct slist *s;
+ struct block *b;
- case Q_UNDEF:
- syntax();
- /* NOTREACHED */
+ s = new_stmt(BPF_LD|BPF_LEN);
+ b = new_block(JMP(jmp));
+ b->stmts = s;
+ b->s.k = n;
- default:
- abort();
- /* NOTREACHED */
- }
- /* NOTREACHED */
+ return b;
}
-#ifdef INET6
struct block *
-gen_mcode6(s1, s2, masklen, q)
- register const char *s1, *s2;
- register int masklen;
- struct qual q;
+gen_greater(n)
+ int n;
+{
+ return gen_len(BPF_JGE, n);
+}
+
+/*
+ * Actually, this is less than or equal.
+ */
+struct block *
+gen_less(n)
+ int n;
{
- struct addrinfo *res;
- struct in6_addr *addr;
- struct in6_addr mask;
struct block *b;
- u_int32_t *a, *m;
- if (s2)
- bpf_error("no mask %s supported", s2);
+ b = gen_len(BPF_JGT, n);
+ gen_not(b);
- res = pcap_nametoaddr(s1);
- if (!res)
- bpf_error("invalid ip6 address %s", s1);
- if (res->ai_next)
- bpf_error("%s resolved to multiple address", s1);
- addr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
+ return b;
+}
- if (sizeof(mask) * 8 < masklen)
- bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8));
- memset(&mask, 0xff, masklen / 8);
- if (masklen % 8) {
- mask.s6_addr[masklen / 8] =
- (0xff << (8 - masklen % 8)) & 0xff;
- }
+struct block *
+gen_byteop(op, idx, val)
+ int op, idx, val;
+{
+ struct block *b;
+ struct slist *s;
- a = (u_int32_t *)addr;
- m = (u_int32_t *)&mask;
- if ((a[0] & ~m[0]) || (a[1] & ~m[1])
- || (a[2] & ~m[2]) || (a[3] & ~m[3])) {
- bpf_error("non-network bits set in \"%s/%d\"", s1, masklen);
- }
+ switch (op) {
+ default:
+ abort();
- switch (q.addr) {
+ case '=':
+ return gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
- case Q_DEFAULT:
- case Q_HOST:
- if (masklen != 128)
- bpf_error("Mask syntax for networks only");
- /* FALLTHROUGH */
+ case '<':
+ b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
+ b->s.code = JMP(BPF_JGE);
+ gen_not(b);
+ return b;
- case Q_NET:
- b = gen_host6(addr, &mask, q.proto, q.dir);
- freeaddrinfo(res);
+ case '>':
+ b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
+ b->s.code = JMP(BPF_JGT);
return b;
- default:
- bpf_error("invalid qualifier against IPv6 address");
- /* NOTREACHED */
+ case '|':
+ s = new_stmt(BPF_ALU|BPF_OR|BPF_K);
+ break;
+
+ case '&':
+ s = new_stmt(BPF_ALU|BPF_AND|BPF_K);
+ break;
}
+ s->s.k = val;
+ b = new_block(JMP(BPF_JEQ));
+ b->stmts = s;
+ gen_not(b);
+
+ return b;
}
-#endif /*INET6*/
+
+static u_char abroadcast[] = { 0x0 };
struct block *
-gen_ecode(eaddr, q)
- register const u_char *eaddr;
- struct qual q;
+gen_broadcast(proto)
+ int proto;
{
- if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) {
+ bpf_u_int32 hostmask;
+ struct block *b0, *b1, *b2;
+ static u_char ebroadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+
+ switch (proto) {
+
+ case Q_DEFAULT:
+ case Q_LINK:
+ if (linktype == DLT_ARCNET || linktype == DLT_ARCNET_LINUX)
+ return gen_ahostop(abroadcast, Q_DST);
if (linktype == DLT_EN10MB)
- return gen_ehostop(eaddr, (int)q.dir);
+ return gen_ehostop(ebroadcast, Q_DST);
if (linktype == DLT_FDDI)
- return gen_fhostop(eaddr, (int)q.dir);
+ return gen_fhostop(ebroadcast, Q_DST);
+ if (linktype == DLT_IEEE802)
+ return gen_thostop(ebroadcast, Q_DST);
+ if (linktype == DLT_IEEE802_11)
+ return gen_wlanhostop(ebroadcast, Q_DST);
+ if (linktype == DLT_IP_OVER_FC)
+ return gen_ipfchostop(ebroadcast, Q_DST);
+ if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b1 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b1);
+
+ /*
+ * Now check the MAC address.
+ */
+ b0 = gen_ehostop(ebroadcast, Q_DST);
+ gen_and(b1, b0);
+ return b0;
+ }
+ bpf_error("not a broadcast link");
+ break;
+
+ case Q_IP:
+ b0 = gen_linktype(ETHERTYPE_IP);
+ hostmask = ~netmask;
+ b1 = gen_mcmp(off_nl + 16, BPF_W, (bpf_int32)0, hostmask);
+ b2 = gen_mcmp(off_nl + 16, BPF_W,
+ (bpf_int32)(~0 & hostmask), hostmask);
+ gen_or(b1, b2);
+ gen_and(b0, b2);
+ return b2;
}
- bpf_error("ethernet address used in non-ether expression");
- /* NOTREACHED */
+ bpf_error("only link-layer/IP broadcast filters supported");
}
-void
-sappend(s0, s1)
- struct slist *s0, *s1;
+/*
+ * Generate code to test the low-order bit of a MAC address (that's
+ * the bottom bit of the *first* byte).
+ */
+static struct block *
+gen_mac_multicast(offset)
+ int offset;
{
- /*
- * This is definitely not the best way to do this, but the
- * lists will rarely get long.
- */
- while (s0->next)
- s0 = s0->next;
- s0->next = s1;
+ register struct block *b0;
+ register struct slist *s;
+
+ /* link[offset] & 1 != 0 */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = offset;
+ b0 = new_block(JMP(BPF_JSET));
+ b0->s.k = 1;
+ b0->stmts = s;
+ return b0;
}
-static struct slist *
-xfer_to_x(a)
- struct arth *a;
+struct block *
+gen_multicast(proto)
+ int proto;
{
- struct slist *s;
+ register struct block *b0, *b1, *b2;
+ register struct slist *s;
- s = new_stmt(BPF_LDX|BPF_MEM);
- s->s.k = a->regno;
- return s;
-}
+ switch (proto) {
-static struct slist *
-xfer_to_a(a)
- struct arth *a;
-{
- struct slist *s;
+ case Q_DEFAULT:
+ case Q_LINK:
+ if (linktype == DLT_ARCNET || linktype == DLT_ARCNET_LINUX)
+ /* all ARCnet multicasts use the same address */
+ return gen_ahostop(abroadcast, Q_DST);
- s = new_stmt(BPF_LD|BPF_MEM);
- s->s.k = a->regno;
- return s;
-}
+ if (linktype == DLT_EN10MB) {
+ /* ether[0] & 1 != 0 */
+ return gen_mac_multicast(0);
+ }
-struct arth *
-gen_load(proto, index, size)
- int proto;
- struct arth *index;
- int size;
-{
- struct slist *s, *tmp;
- struct block *b;
- int regno = alloc_reg();
+ if (linktype == DLT_FDDI) {
+ /*
+ * XXX TEST THIS: MIGHT NOT PORT PROPERLY XXX
+ *
+ * XXX - was that referring to bit-order issues?
+ */
+ /* fddi[1] & 1 != 0 */
+ return gen_mac_multicast(1);
+ }
+
+ if (linktype == DLT_IEEE802) {
+ /* tr[2] & 1 != 0 */
+ return gen_mac_multicast(2);
+ }
+
+ if (linktype == DLT_IEEE802_11) {
+ /*
+ * Oh, yuk.
+ *
+ * For control frames, there is no DA.
+ *
+ * For management frames, DA is at an
+ * offset of 4 from the beginning of
+ * the packet.
+ *
+ * For data frames, DA is at an offset
+ * of 4 from the beginning of the packet
+ * if To DS is clear and at an offset of
+ * 16 from the beginning of the packet
+ * if To DS is set.
+ */
+
+ /*
+ * Generate the tests to be done for data frames.
+ *
+ * First, check for To DS set, i.e. "link[1] & 0x01".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x01; /* To DS */
+ b1->stmts = s;
+
+ /*
+ * If To DS is set, the DA is at 16.
+ */
+ b0 = gen_mac_multicast(16);
+ gen_and(b1, b0);
+
+ /*
+ * Now, check for To DS not set, i.e. check
+ * "!(link[1] & 0x01)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x01; /* To DS */
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * If To DS is not set, the DA is at 4.
+ */
+ b1 = gen_mac_multicast(4);
+ gen_and(b2, b1);
+
+ /*
+ * Now OR together the last two checks. That gives
+ * the complete set of checks for data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * Now check for a data frame.
+ * I.e, check "link[0] & 0x08".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x08;
+ b1->stmts = s;
+
+ /*
+ * AND that with the checks done for data frames.
+ */
+ gen_and(b1, b0);
+
+ /*
+ * If the high-order bit of the type value is 0, this
+ * is a management frame.
+ * I.e, check "!(link[0] & 0x08)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x08;
+ b2->stmts = s;
+ gen_not(b2);
- free_reg(index->regno);
- switch (size) {
+ /*
+ * For management frames, the DA is at 4.
+ */
+ b1 = gen_mac_multicast(4);
+ gen_and(b2, b1);
- default:
- bpf_error("data size must be 1, 2, or 4");
+ /*
+ * OR that with the checks done for data frames.
+ * That gives the checks done for management and
+ * data frames.
+ */
+ gen_or(b1, b0);
- case 1:
- size = BPF_B;
- break;
+ /*
+ * If the low-order bit of the type value is 1,
+ * this is either a control frame or a frame
+ * with a reserved type, and thus not a
+ * frame with an SA.
+ *
+ * I.e., check "!(link[0] & 0x04)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x04;
+ b1->stmts = s;
+ gen_not(b1);
- case 2:
- size = BPF_H;
- break;
+ /*
+ * AND that with the checks for data and management
+ * frames.
+ */
+ gen_and(b1, b0);
+ return b0;
+ }
- case 4:
- size = BPF_W;
- break;
- }
- switch (proto) {
- default:
- bpf_error("unsupported index operation");
+ if (linktype == DLT_IP_OVER_FC) {
+ b0 = gen_mac_multicast(2);
+ return b0;
+ }
- case Q_LINK:
- s = xfer_to_x(index);
- tmp = new_stmt(BPF_LD|BPF_IND|size);
- sappend(s, tmp);
- sappend(index->s, s);
- break;
+ if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b1 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b1);
- case Q_IP:
- case Q_ARP:
- case Q_RARP:
- case Q_ATALK:
- case Q_DECNET:
- case Q_SCA:
- case Q_LAT:
- case Q_MOPRC:
- case Q_MOPDL:
-#ifdef INET6
- case Q_IPV6:
-#endif
- /* XXX Note that we assume a fixed link header here. */
- s = xfer_to_x(index);
- tmp = new_stmt(BPF_LD|BPF_IND|size);
- tmp->s.k = off_nl;
- sappend(s, tmp);
- sappend(index->s, s);
+ /* ether[off_mac] & 1 != 0 */
+ b0 = gen_mac_multicast(off_mac);
+ gen_and(b1, b0);
+ return b0;
+ }
- b = gen_proto_abbrev(proto);
- if (index->b)
- gen_and(index->b, b);
- index->b = b;
+ /* Link not known to support multicasts */
break;
- case Q_TCP:
- case Q_UDP:
- case Q_ICMP:
- case Q_IGMP:
- case Q_IGRP:
- case Q_PIM:
- s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
- s->s.k = off_nl;
- sappend(s, xfer_to_a(index));
- sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
- sappend(s, new_stmt(BPF_MISC|BPF_TAX));
- sappend(s, tmp = new_stmt(BPF_LD|BPF_IND|size));
- tmp->s.k = off_nl;
- sappend(index->s, s);
+ case Q_IP:
+ b0 = gen_linktype(ETHERTYPE_IP);
+ b1 = gen_cmp(off_nl + 16, BPF_B, (bpf_int32)224);
+ b1->s.code = JMP(BPF_JGE);
+ gen_and(b0, b1);
+ return b1;
- gen_and(gen_proto_abbrev(proto), b = gen_ipfrag());
- if (index->b)
- gen_and(index->b, b);
-#ifdef INET6
- gen_and(gen_proto_abbrev(Q_IP), b);
-#endif
- index->b = b;
- break;
#ifdef INET6
- case Q_ICMPV6:
- bpf_error("IPv6 upper-layer protocol is not supported by proto[x]");
- /*NOTREACHED*/
-#endif
+ case Q_IPV6:
+ b0 = gen_linktype(ETHERTYPE_IPV6);
+ b1 = gen_cmp(off_nl + 24, BPF_B, (bpf_int32)255);
+ gen_and(b0, b1);
+ return b1;
+#endif /* INET6 */
}
- index->regno = regno;
- s = new_stmt(BPF_ST);
- s->s.k = regno;
- sappend(index->s, s);
-
- return index;
+ bpf_error("link-layer multicast filters supported only on ethernet/FDDI/token ring/ARCNET/802.11/ATM LANE/Fibre Channel");
}
+/*
+ * generate command for inbound/outbound. It's here so we can
+ * make it link-type specific. 'dir' = 0 implies "inbound",
+ * = 1 implies "outbound".
+ */
struct block *
-gen_relation(code, a0, a1, reversed)
- int code;
- struct arth *a0, *a1;
- int reversed;
+gen_inbound(dir)
+ int dir;
{
- struct slist *s0, *s1, *s2;
- struct block *b, *tmp;
-
- s0 = xfer_to_x(a1);
- s1 = xfer_to_a(a0);
- s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X);
- b = new_block(JMP(code));
- if (code == BPF_JGT || code == BPF_JGE) {
- reversed = !reversed;
- b->s.k = 0x80000000;
- }
- if (reversed)
- gen_not(b);
-
- sappend(s1, s2);
- sappend(s0, s1);
- sappend(a1->s, s0);
- sappend(a0->s, a1->s);
-
- b->stmts = a0->s;
+ register struct block *b0;
- free_reg(a0->regno);
- free_reg(a1->regno);
+ /*
+ * Only some data link types support inbound/outbound qualifiers.
+ */
+ switch (linktype) {
+ case DLT_SLIP:
+ b0 = gen_relation(BPF_JEQ,
+ gen_load(Q_LINK, gen_loadi(0), 1),
+ gen_loadi(0),
+ dir);
+ break;
- /* 'and' together protocol checks */
- if (a0->b) {
- if (a1->b) {
- gen_and(a0->b, tmp = a1->b);
+ case DLT_LINUX_SLL:
+ if (dir) {
+ /*
+ * Match packets sent by this machine.
+ */
+ b0 = gen_cmp(0, BPF_H, LINUX_SLL_OUTGOING);
+ } else {
+ /*
+ * Match packets sent to this machine.
+ * (No broadcast or multicast packets, or
+ * packets sent to some other machine and
+ * received promiscuously.)
+ *
+ * XXX - packets sent to other machines probably
+ * shouldn't be matched, but what about broadcast
+ * or multicast packets we received?
+ */
+ b0 = gen_cmp(0, BPF_H, LINUX_SLL_HOST);
}
- else
- tmp = a0->b;
- } else
- tmp = a1->b;
+ break;
- if (tmp)
- gen_and(tmp, b);
+ case DLT_PFLOG:
+ b0 = gen_cmp(26, BPF_H,
+ (bpf_int32)((dir == 0) ? PF_IN : PF_OUT));
+ break;
- return b;
+ default:
+ bpf_error("inbound/outbound not supported on linktype %d",
+ linktype);
+ b0 = NULL;
+ /* NOTREACHED */
+ }
+ return (b0);
}
-struct arth *
-gen_loadlen()
+/* PF firewall log matched interface */
+struct block *
+gen_pf_ifname(const char *ifname)
{
- int regno = alloc_reg();
- struct arth *a = (struct arth *)newchunk(sizeof(*a));
- struct slist *s;
-
- s = new_stmt(BPF_LD|BPF_LEN);
- s->next = new_stmt(BPF_ST);
- s->next->s.k = regno;
- a->s = s;
- a->regno = regno;
-
- return a;
+ if (linktype != DLT_PFLOG) {
+ bpf_error("ifname supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
+ if (strlen(ifname) >= 16) {
+ bpf_error("ifname interface names can't be larger than 16 characters");
+ /* NOTREACHED */
+ }
+ return (gen_bcmp(4, strlen(ifname), (const u_char *)ifname));
}
-struct arth *
-gen_loadi(val)
- int val;
-{
- struct arth *a;
- struct slist *s;
- int reg;
- a = (struct arth *)newchunk(sizeof(*a));
+/* PF firewall log rule number */
+struct block *
+gen_pf_rnr(int rnr)
+{
+ if (linktype != DLT_PFLOG) {
+ bpf_error("rnr supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
- reg = alloc_reg();
+ return (gen_cmp(20, BPF_H, (bpf_int32)rnr));
+}
- s = new_stmt(BPF_LD|BPF_IMM);
- s->s.k = val;
- s->next = new_stmt(BPF_ST);
- s->next->s.k = reg;
- a->s = s;
- a->regno = reg;
+/* PF firewall log reason code */
+struct block *
+gen_pf_reason(int reason)
+{
+ if (linktype != DLT_PFLOG) {
+ bpf_error("reason supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
- return a;
+ return (gen_cmp(22, BPF_H, (bpf_int32)reason));
}
-struct arth *
-gen_neg(a)
- struct arth *a;
+/* PF firewall log action */
+struct block *
+gen_pf_action(int action)
{
- struct slist *s;
-
- s = xfer_to_a(a);
- sappend(a->s, s);
- s = new_stmt(BPF_ALU|BPF_NEG);
- s->s.k = 0;
- sappend(a->s, s);
- s = new_stmt(BPF_ST);
- s->s.k = a->regno;
- sappend(a->s, s);
+ if (linktype != DLT_PFLOG) {
+ bpf_error("action supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
- return a;
+ return (gen_cmp(24, BPF_H, (bpf_int32)action));
}
-struct arth *
-gen_arth(code, a0, a1)
- int code;
- struct arth *a0, *a1;
+struct block *
+gen_acode(eaddr, q)
+ register const u_char *eaddr;
+ struct qual q;
{
- struct slist *s0, *s1, *s2;
+ if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) {
+ if (linktype == DLT_ARCNET || linktype == DLT_ARCNET_LINUX)
+ return gen_ahostop(eaddr, (int)q.dir);
+ }
+ bpf_error("ARCnet address used in non-arc expression");
+ /* NOTREACHED */
+}
- s0 = xfer_to_x(a1);
- s1 = xfer_to_a(a0);
- s2 = new_stmt(BPF_ALU|BPF_X|code);
+static struct block *
+gen_ahostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
+{
+ register struct block *b0, *b1;
- sappend(s1, s2);
- sappend(s0, s1);
- sappend(a1->s, s0);
- sappend(a0->s, a1->s);
+ switch (dir) {
+ /* src comes first, different from Ethernet */
+ case Q_SRC:
+ return gen_bcmp(0, 1, eaddr);
- free_reg(a1->regno);
+ case Q_DST:
+ return gen_bcmp(1, 1, eaddr);
- s0 = new_stmt(BPF_ST);
- a0->regno = s0->s.k = alloc_reg();
- sappend(a0->s, s0);
+ case Q_AND:
+ b0 = gen_ahostop(eaddr, Q_SRC);
+ b1 = gen_ahostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
- return a0;
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_ahostop(eaddr, Q_SRC);
+ b1 = gen_ahostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
}
/*
- * Here we handle simple allocation of the scratch registers.
- * If too many registers are alloc'd, the allocator punts.
- */
-static int regused[BPF_MEMWORDS];
-static int curreg;
-
-/*
- * Return the next free register.
+ * support IEEE 802.1Q VLAN trunk over ethernet
*/
-static int
-alloc_reg()
+struct block *
+gen_vlan(vlan_num)
+ int vlan_num;
{
- int n = BPF_MEMWORDS;
+ struct block *b0;
- while (--n >= 0) {
- if (regused[curreg])
- curreg = (curreg + 1) % BPF_MEMWORDS;
- else {
- regused[curreg] = 1;
- return curreg;
+ /*
+ * Change the offsets to point to the type and data fields within
+ * the VLAN packet. This is somewhat of a kludge.
+ */
+ if (orig_nl == (u_int)-1) {
+ orig_linktype = off_linktype; /* save original values */
+ orig_nl = off_nl;
+ orig_nl_nosnap = off_nl_nosnap;
+
+ switch (linktype) {
+
+ case DLT_EN10MB:
+ off_linktype = 16;
+ off_nl_nosnap = 18;
+ off_nl = 18;
+ break;
+
+ default:
+ bpf_error("no VLAN support for data link type %d",
+ linktype);
+ /*NOTREACHED*/
}
}
- bpf_error("too many registers needed to evaluate expression");
- /* NOTREACHED */
-}
-/*
- * Return a register to the table so it can
- * be used later.
- */
-static void
-free_reg(n)
- int n;
-{
- regused[n] = 0;
-}
+ /* check for VLAN */
+ b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_8021Q);
-static struct block *
-gen_len(jmp, n)
- int jmp, n;
-{
- struct slist *s;
- struct block *b;
+ /* If a specific VLAN is requested, check VLAN id */
+ if (vlan_num >= 0) {
+ struct block *b1;
- s = new_stmt(BPF_LD|BPF_LEN);
- b = new_block(JMP(jmp));
- b->stmts = s;
- b->s.k = n;
+ b1 = gen_cmp(orig_nl, BPF_H, (bpf_int32)vlan_num);
+ gen_and(b0, b1);
+ b0 = b1;
+ }
- return b;
+ return (b0);
}
struct block *
-gen_greater(n)
- int n;
+gen_atmfield_code(atmfield, jvalue, jtype, reverse)
+ int atmfield;
+ bpf_u_int32 jvalue;
+ bpf_u_int32 jtype;
+ int reverse;
{
- return gen_len(BPF_JGE, n);
-}
+ struct block *b0;
-struct block *
-gen_less(n)
- int n;
-{
- struct block *b;
+ switch (atmfield) {
- b = gen_len(BPF_JGT, n);
- gen_not(b);
+ case A_VPI:
+ if (!is_atm)
+ bpf_error("'vpi' supported only on raw ATM");
+ if (off_vpi == -1)
+ abort();
+ b0 = gen_ncmp(BPF_B, off_vpi, 0xffffffff, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
- return b;
+ case A_VCI:
+ if (!is_atm)
+ bpf_error("'vci' supported only on raw ATM");
+ if (off_vci == -1)
+ abort();
+ b0 = gen_ncmp(BPF_H, off_vci, 0xffffffff, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ case A_PROTOTYPE:
+ if (off_proto == -1)
+ abort(); /* XXX - this isn't on FreeBSD */
+ b0 = gen_ncmp(BPF_B, off_proto, 0x0f, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ case A_MSGTYPE:
+ if (off_payload == -1)
+ abort();
+ b0 = gen_ncmp(BPF_B, off_payload + MSG_TYPE_POS, 0xffffffff,
+ (u_int)jtype, (u_int)jvalue, reverse);
+ break;
+
+ case A_CALLREFTYPE:
+ if (!is_atm)
+ bpf_error("'callref' supported only on raw ATM");
+ if (off_proto == -1)
+ abort();
+ b0 = gen_ncmp(BPF_B, off_proto, 0xffffffff, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ default:
+ abort();
+ }
+ return b0;
}
struct block *
-gen_byteop(op, idx, val)
- int op, idx, val;
+gen_atmtype_abbrev(type)
+ int type;
{
- struct block *b;
- struct slist *s;
+ struct block *b0, *b1;
- switch (op) {
- default:
- abort();
+ switch (type) {
- case '=':
- return gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
+ case A_METAC:
+ /* Get all packets in Meta signalling Circuit */
+ if (!is_atm)
+ bpf_error("'metac' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 1, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
- case '<':
- b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
- b->s.code = JMP(BPF_JGE);
- gen_not(b);
- return b;
+ case A_BCC:
+ /* Get all packets in Broadcast Circuit*/
+ if (!is_atm)
+ bpf_error("'bcc' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 2, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
- case '>':
- b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
- b->s.code = JMP(BPF_JGT);
- return b;
+ case A_OAMF4SC:
+ /* Get all cells in Segment OAM F4 circuit*/
+ if (!is_atm)
+ bpf_error("'oam4sc' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
- case '|':
- s = new_stmt(BPF_ALU|BPF_OR|BPF_K);
+ case A_OAMF4EC:
+ /* Get all cells in End-to-End OAM F4 Circuit*/
+ if (!is_atm)
+ bpf_error("'oam4ec' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0);
+ gen_and(b0, b1);
break;
- case '&':
- s = new_stmt(BPF_ALU|BPF_AND|BPF_K);
+ case A_SC:
+ /* Get all packets in connection Signalling Circuit */
+ if (!is_atm)
+ bpf_error("'sc' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 5, BPF_JEQ, 0);
+ gen_and(b0, b1);
break;
- }
- s->s.k = val;
- b = new_block(JMP(BPF_JEQ));
- b->stmts = s;
- gen_not(b);
- return b;
-}
+ case A_ILMIC:
+ /* Get all packets in ILMI Circuit */
+ if (!is_atm)
+ bpf_error("'ilmic' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 16, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
-struct block *
-gen_broadcast(proto)
- int proto;
-{
- bpf_u_int32 hostmask;
- struct block *b0, *b1, *b2;
- static u_char ebroadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
+ case A_LANE:
+ /* Get all LANE packets */
+ if (!is_atm)
+ bpf_error("'lane' supported only on raw ATM");
+ b1 = gen_atmfield_code(A_PROTOTYPE, PT_LANE, BPF_JEQ, 0);
- switch (proto) {
+ /*
+ * Arrange that all subsequent tests assume LANE
+ * rather than LLC-encapsulated packets, and set
+ * the offsets appropriately for LANE-encapsulated
+ * Ethernet.
+ *
+ * "off_mac" is the offset of the Ethernet header,
+ * which is 2 bytes past the ATM pseudo-header
+ * (skipping the pseudo-header and 2-byte LE Client
+ * field). The other offsets are Ethernet offsets
+ * relative to "off_mac".
+ */
+ is_lane = 1;
+ off_mac = off_payload + 2; /* MAC header */
+ off_linktype = off_mac + 12;
+ off_nl = off_mac + 14; /* Ethernet II */
+ off_nl_nosnap = off_mac + 17; /* 802.3+802.2 */
+ break;
- case Q_DEFAULT:
- case Q_LINK:
- if (linktype == DLT_EN10MB)
- return gen_ehostop(ebroadcast, Q_DST);
- if (linktype == DLT_FDDI)
- return gen_fhostop(ebroadcast, Q_DST);
- bpf_error("not a broadcast link");
+ case A_LLC:
+ /* Get all LLC-encapsulated packets */
+ if (!is_atm)
+ bpf_error("'llc' supported only on raw ATM");
+ b1 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
+ is_lane = 0;
break;
- case Q_IP:
- b0 = gen_linktype(ETHERTYPE_IP);
- hostmask = ~netmask;
- b1 = gen_mcmp(off_nl + 16, BPF_W, (bpf_int32)0, hostmask);
- b2 = gen_mcmp(off_nl + 16, BPF_W,
- (bpf_int32)(~0 & hostmask), hostmask);
- gen_or(b1, b2);
- gen_and(b0, b2);
- return b2;
+ default:
+ abort();
}
- bpf_error("only ether/ip broadcast filters supported");
+ return b1;
}
-struct block *
-gen_multicast(proto)
- int proto;
+
+static struct block *
+gen_msg_abbrev(type)
+ int type;
{
- register struct block *b0, *b1;
- register struct slist *s;
+ struct block *b1;
- switch (proto) {
+ /*
+ * Q.2931 signalling protocol messages for handling virtual circuits
+ * establishment and teardown
+ */
+ switch (type) {
- case Q_DEFAULT:
- case Q_LINK:
- if (linktype == DLT_EN10MB) {
- /* ether[0] & 1 != 0 */
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 0;
- b0 = new_block(JMP(BPF_JSET));
- b0->s.k = 1;
- b0->stmts = s;
- return b0;
- }
+ case A_SETUP:
+ b1 = gen_atmfield_code(A_MSGTYPE, SETUP, BPF_JEQ, 0);
+ break;
- if (linktype == DLT_FDDI) {
- /* XXX TEST THIS: MIGHT NOT PORT PROPERLY XXX */
- /* fddi[1] & 1 != 0 */
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 1;
- b0 = new_block(JMP(BPF_JSET));
- b0->s.k = 1;
- b0->stmts = s;
- return b0;
- }
- /* Link not known to support multicasts */
+ case A_CALLPROCEED:
+ b1 = gen_atmfield_code(A_MSGTYPE, CALL_PROCEED, BPF_JEQ, 0);
break;
- case Q_IP:
- b0 = gen_linktype(ETHERTYPE_IP);
- b1 = gen_cmp(off_nl + 16, BPF_B, (bpf_int32)224);
- b1->s.code = JMP(BPF_JGE);
- gen_and(b0, b1);
- return b1;
+ case A_CONNECT:
+ b1 = gen_atmfield_code(A_MSGTYPE, CONNECT, BPF_JEQ, 0);
+ break;
-#ifdef INET6
- case Q_IPV6:
- b0 = gen_linktype(ETHERTYPE_IPV6);
- b1 = gen_cmp(off_nl + 24, BPF_B, (bpf_int32)255);
- gen_and(b0, b1);
- return b1;
-#endif /* INET6 */
+ case A_CONNECTACK:
+ b1 = gen_atmfield_code(A_MSGTYPE, CONNECT_ACK, BPF_JEQ, 0);
+ break;
+
+ case A_RELEASE:
+ b1 = gen_atmfield_code(A_MSGTYPE, RELEASE, BPF_JEQ, 0);
+ break;
+
+ case A_RELEASE_DONE:
+ b1 = gen_atmfield_code(A_MSGTYPE, RELEASE_DONE, BPF_JEQ, 0);
+ break;
+
+ default:
+ abort();
}
- bpf_error("only IP multicast filters supported on ethernet/FDDI");
+ return b1;
}
-/*
- * generate command for inbound/outbound. It's here so we can
- * make it link-type specific. 'dir' = 0 implies "inbound",
- * = 1 implies "outbound".
- */
struct block *
-gen_inbound(dir)
- int dir;
+gen_atmmulti_abbrev(type)
+ int type;
{
- register struct block *b0;
+ struct block *b0, *b1;
- b0 = gen_relation(BPF_JEQ,
- gen_load(Q_LINK, gen_loadi(0), 1),
- gen_loadi(0),
- dir);
- return (b0);
+ switch (type) {
+
+ case A_OAM:
+ if (!is_atm)
+ bpf_error("'oam' supported only on raw ATM");
+ b1 = gen_atmmulti_abbrev(A_OAMF4);
+ break;
+
+ case A_OAMF4:
+ if (!is_atm)
+ bpf_error("'oamf4' supported only on raw ATM");
+ /* OAM F4 type */
+ b0 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0);
+ gen_or(b0, b1);
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_CONNECTMSG:
+ /*
+ * Get Q.2931 signalling messages for switched
+ * virtual connection
+ */
+ if (!is_atm)
+ bpf_error("'connectmsg' supported only on raw ATM");
+ b0 = gen_msg_abbrev(A_SETUP);
+ b1 = gen_msg_abbrev(A_CALLPROCEED);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_CONNECT);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_CONNECTACK);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE_DONE);
+ gen_or(b0, b1);
+ b0 = gen_atmtype_abbrev(A_SC);
+ gen_and(b0, b1);
+ break;
+
+ case A_METACONNECT:
+ if (!is_atm)
+ bpf_error("'metaconnect' supported only on raw ATM");
+ b0 = gen_msg_abbrev(A_SETUP);
+ b1 = gen_msg_abbrev(A_CALLPROCEED);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_CONNECT);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE_DONE);
+ gen_or(b0, b1);
+ b0 = gen_atmtype_abbrev(A_METAC);
+ gen_and(b0, b1);
+ break;
+
+ default:
+ abort();
+ }
+ return b1;
}
projects / libpcap / blobdiff