* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.193 2003-08-18 22:09:30 guy Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.221.2.54 2007-10-26 00:47:36 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#else /* WIN32 */
#include <sys/types.h>
#include <sys/socket.h>
-#include <sys/time.h>
#endif /* WIN32 */
/*
#include <setjmp.h>
#include <stdarg.h>
+#ifdef MSDOS
+#include "pcap-dos.h"
+#endif
+
#include "pcap-int.h"
#include "ethertype.h"
#include "ppp.h"
#include "sll.h"
#include "arcnet.h"
-#include "pf.h"
+#ifdef HAVE_NET_PFVAR_H
+#include <sys/socket.h>
+#include <net/if.h>
+#include <net/pfvar.h>
+#include <net/if_pflog.h>
+#endif
+#ifndef offsetof
+#define offsetof(s, e) ((size_t)&((s *)0)->e)
+#endif
#ifdef INET6
#ifndef WIN32
#include <netdb.h> /* for "struct addrinfo" */
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;
+#ifdef WIN32
+/* Hack for updating VLAN, MPLS, and PPPoE offsets. */
+static u_int orig_linktype = (u_int)-1, orig_nl = (u_int)-1, label_stack_depth = (u_int)-1;
+#else
+static u_int orig_linktype = -1U, orig_nl = -1U, label_stack_depth = -1U;
+#endif
/* XXX */
#ifdef PCAP_FDDIPAD
-int pcap_fddipad = PCAP_FDDIPAD;
-#else
-int pcap_fddipad;
+static int pcap_fddipad;
#endif
/* VARARGS */
void
bpf_error(const char *fmt, ...)
-
{
va_list ap;
/* NOTREACHED */
}
-static void init_linktype(int);
+static void init_linktype(pcap_t *);
+static void init_regs(void);
static int alloc_reg(void);
static void free_reg(int);
static struct block *root;
+/*
+ * Value passed to gen_load_a() to indicate what the offset argument
+ * is relative to.
+ */
+enum e_offrel {
+ OR_PACKET, /* relative to the beginning of the packet */
+ OR_LINK, /* relative to the link-layer header */
+ OR_NET, /* relative to the network-layer header */
+ OR_NET_NOSNAP, /* relative to the network-layer header, with no SNAP header at the link layer */
+ OR_TRAN_IPV4, /* relative to the transport-layer header, with IPv4 network layer */
+ OR_TRAN_IPV6 /* relative to the transport-layer header, with IPv6 network layer */
+};
+
/*
* We divy out chunks of memory rather than call malloc each time so
* we don't have to worry about leaking memory. It's probably
- * not a big deal if all this memory was wasted but it this ever
+ * not a big deal if all this memory was wasted but if this ever
* goes into a library that would probably not be a good idea.
+ *
+ * XXX - this *is* in a library....
*/
#define NCHUNKS 16
#define CHUNK0SIZE 1024
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_cmp(enum e_offrel, u_int, u_int, bpf_int32);
+static struct block *gen_cmp_gt(enum e_offrel, u_int, u_int, bpf_int32);
+static struct block *gen_cmp_ge(enum e_offrel, u_int, u_int, bpf_int32);
+static struct block *gen_cmp_lt(enum e_offrel, u_int, u_int, bpf_int32);
+static struct block *gen_cmp_le(enum e_offrel, u_int, u_int, bpf_int32);
+static struct block *gen_mcmp(enum e_offrel, u_int, u_int, bpf_int32,
+ bpf_u_int32);
+static struct block *gen_bcmp(enum e_offrel, u_int, u_int, const u_char *);
+static struct block *gen_ncmp(enum e_offrel, bpf_u_int32, bpf_u_int32,
+ bpf_u_int32, bpf_u_int32, int, bpf_int32);
+static struct slist *gen_load_llrel(u_int, u_int);
+static struct slist *gen_load_a(enum e_offrel, u_int, u_int);
+static struct slist *gen_loadx_iphdrlen(void);
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_linux_sll_linktype(int);
+static void insert_radiotap_load_llprefixlen(struct block *);
+static void insert_ppi_load_llprefixlen(struct block *);
+static void insert_load_llprefixlen(struct block *);
+static struct slist *gen_llprefixlen(void);
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_llc_linktype(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);
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);
+static struct block *gen_dnhostop(bpf_u_int32, int);
+static struct block *gen_mpls_linktype(int);
+static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int, int);
#ifdef INET6
-static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, int);
+static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, 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);
+static struct block *gen_portrangeatom(int, bpf_int32, bpf_int32);
#ifdef INET6
static struct block *gen_portatom6(int, bpf_int32);
+static struct block *gen_portrangeatom6(int, bpf_int32, bpf_int32);
#endif
struct block *gen_portop(int, int, int);
static struct block *gen_port(int, int, int);
+struct block *gen_portrangeop(int, int, int, int);
+static struct block *gen_portrange(int, int, int, int);
#ifdef INET6
struct block *gen_portop6(int, int, int);
static struct block *gen_port6(int, int, int);
+struct block *gen_portrangeop6(int, int, int, int);
+static struct block *gen_portrange6(int, int, int, int);
#endif
static int lookup_proto(const char *, int);
static struct block *gen_protochain(int, int, int);
static struct block *gen_mac_multicast(int);
static struct block *gen_len(int, int);
+static struct block *gen_ppi_dlt_check(void);
static struct block *gen_msg_abbrev(int type);
static void *
int
pcap_compile(pcap_t *p, struct bpf_program *program,
- char *buf, int optimize, bpf_u_int32 mask)
+ const char *buf, int optimize, bpf_u_int32 mask)
{
extern int n_errors;
+ const char * volatile xbuf = buf;
int len;
no_optimize = 0;
n_errors = 0;
root = NULL;
bpf_pcap = p;
+ init_regs();
if (setjmp(top_ctx)) {
lex_cleanup();
freechunks();
return -1;
}
- lex_init(buf ? buf : "");
- init_linktype(pcap_datalink(p));
+ lex_init(xbuf ? xbuf : "");
+ init_linktype(p);
(void)pcap_parse();
if (n_errors)
int
pcap_compile_nopcap(int snaplen_arg, int linktype_arg,
struct bpf_program *program,
- char *buf, int optimize, bpf_u_int32 mask)
+ const char *buf, int optimize, bpf_u_int32 mask)
{
pcap_t *p;
int ret;
*p = b1;
}
+
void
finish_parse(p)
struct block *p;
{
+ struct block *ppi_dlt_check;
+
+ ppi_dlt_check = gen_ppi_dlt_check();
+
+ if (ppi_dlt_check != NULL)
+ {
+ gen_and(ppi_dlt_check, p);
+ }
+
backpatch(p, gen_retblk(snaplen));
p->sense = !p->sense;
backpatch(p, gen_retblk(0));
root = p->head;
+
+ /*
+ * Insert before the statements of the first (root) block any
+ * statements needed to load the lengths of any variable-length
+ * headers into registers.
+ *
+ * XXX - a fancier strategy would be to insert those before the
+ * statements of all blocks that use those lengths and that
+ * have no predecessors that use them, so that we only compute
+ * the lengths if we need them. There might be even better
+ * approaches than that. However, as we're currently only
+ * handling variable-length radiotap headers, and as all
+ * filtering expressions other than raw link[M:N] tests
+ * require the length of that header, doing more for that
+ * header length isn't really worth the effort.
+ */
+
+ insert_load_llprefixlen(root);
}
void
}
static struct block *
-gen_cmp(offset, size, v)
+gen_cmp(offrel, offset, size, v)
+ enum e_offrel offrel;
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_JEQ));
- b->stmts = s;
- b->s.k = v;
-
- return b;
+ return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JEQ, 0, v);
}
static struct block *
-gen_cmp_gt(offset, size, v)
+gen_cmp_gt(offrel, offset, size, v)
+ enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
{
- struct slist *s;
- struct block *b;
+ return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGT, 0, v);
+}
- s = new_stmt(BPF_LD|BPF_ABS|size);
- s->s.k = offset;
+static struct block *
+gen_cmp_ge(offrel, offset, size, v)
+ enum e_offrel offrel;
+ u_int offset, size;
+ bpf_int32 v;
+{
+ return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGE, 0, v);
+}
- b = new_block(JMP(BPF_JGT));
- b->stmts = s;
- b->s.k = v;
+static struct block *
+gen_cmp_lt(offrel, offset, size, v)
+ enum e_offrel offrel;
+ u_int offset, size;
+ bpf_int32 v;
+{
+ return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGE, 1, v);
+}
- return b;
+static struct block *
+gen_cmp_le(offrel, offset, size, v)
+ enum e_offrel offrel;
+ u_int offset, size;
+ bpf_int32 v;
+{
+ return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGT, 1, v);
}
static struct block *
-gen_mcmp(offset, size, v, mask)
+gen_mcmp(offrel, offset, size, v, mask)
+ enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
bpf_u_int32 mask;
{
- struct block *b = gen_cmp(offset, size, v);
- struct slist *s;
-
- if (mask != 0xffffffff) {
- s = new_stmt(BPF_ALU|BPF_AND|BPF_K);
- s->s.k = mask;
- b->stmts->next = s;
- }
- return b;
+ return gen_ncmp(offrel, offset, size, mask, BPF_JEQ, 0, v);
}
static struct block *
-gen_bcmp(offset, size, v)
+gen_bcmp(offrel, offset, size, v)
+ enum e_offrel offrel;
register u_int offset, size;
register const u_char *v;
{
bpf_int32 w = ((bpf_int32)p[0] << 24) |
((bpf_int32)p[1] << 16) | ((bpf_int32)p[2] << 8) | p[3];
- tmp = gen_cmp(offset + size - 4, BPF_W, w);
+ tmp = gen_cmp(offrel, offset + size - 4, BPF_W, w);
if (b != NULL)
gen_and(b, tmp);
b = tmp;
register const u_char *p = &v[size - 2];
bpf_int32 w = ((bpf_int32)p[0] << 8) | p[1];
- tmp = gen_cmp(offset + size - 2, BPF_H, w);
+ tmp = gen_cmp(offrel, offset + size - 2, BPF_H, w);
if (b != NULL)
gen_and(b, tmp);
b = tmp;
size -= 2;
}
if (size > 0) {
- tmp = gen_cmp(offset, BPF_B, (bpf_int32)v[0]);
+ tmp = gen_cmp(offrel, offset, BPF_B, (bpf_int32)v[0]);
if (b != NULL)
gen_and(b, tmp);
b = tmp;
return b;
}
+/*
+ * AND the field of size "size" at offset "offset" relative to the header
+ * specified by "offrel" with "mask", and compare it with the value "v"
+ * with the test specified by "jtype"; if "reverse" is true, the test
+ * should test the opposite of "jtype".
+ */
static struct block *
-gen_ncmp(datasize, offset, mask, jtype, jvalue, reverse)
- bpf_u_int32 datasize, offset, mask, jtype, jvalue;
+gen_ncmp(offrel, offset, size, mask, jtype, reverse, v)
+ enum e_offrel offrel;
+ bpf_int32 v;
+ bpf_u_int32 offset, size, mask, jtype;
int reverse;
{
- struct slist *s;
+ struct slist *s, *s2;
struct block *b;
-
- s = new_stmt(BPF_LD|datasize|BPF_ABS);
- s->s.k = offset;
-
+
+ s = gen_load_a(offrel, offset, size);
+
if (mask != 0xffffffff) {
- s->next = new_stmt(BPF_ALU|BPF_AND|BPF_K);
- s->next->s.k = mask;
+ s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K);
+ s2->s.k = mask;
+ sappend(s, s2);
}
-
+
b = new_block(JMP(jtype));
b->stmts = s;
- b->s.k = jvalue;
+ b->s.k = v;
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.
+ * layer. These variables give the necessary offsets from the beginning
+ * of the packet data.
+ *
+ * If the link layer has variable_length headers, the offsets are offsets
+ * from the end of the link-link-layer header, and "reg_ll_size" is
+ * the register number for a register containing the length of the
+ * link-layer header. Otherwise, "reg_ll_size" is -1.
*/
+static int reg_ll_size;
+
+/*
+ * This is the offset of the beginning of the link-layer header from
+ * the beginning of the raw packet data.
+ *
+ * It's usually 0, except for 802.11 with a fixed-length radio header.
+ * (For 802.11 with a variable-length radio header, we have to generate
+ * code to compute that offset; off_ll is 0 in that case.)
+ */
+static u_int off_ll;
/*
* This is the offset of the beginning of the MAC-layer header.
- * It's usually 0, except for ATM LANE.
+ * It's usually 0, except for ATM LANE, where it's the offset, relative
+ * to the beginning of the raw packet data, of the Ethernet header.
*/
static u_int off_mac;
/*
* "off_linktype" is the offset to information in the link-layer header
- * giving the packet type.
+ * giving the packet type. This offset is relative to the beginning
+ * of the link-layer header (i.e., it doesn't include off_ll).
*
* For Ethernet, it's the offset of the Ethernet type field.
*
static u_int off_vci;
static u_int off_proto;
+/*
+ * These are offsets for the MTP2 fields.
+ */
+static u_int off_li;
+
+/*
+ * These are offsets for the MTP3 fields.
+ */
+static u_int off_sio;
+static u_int off_opc;
+static u_int off_dpc;
+static u_int off_sls;
+
/*
* This is the offset of the first byte after the ATM pseudo_header,
* or -1 if there is no ATM pseudo-header.
/*
* These are offsets to the beginning of the network-layer header.
+ * They are relative to the beginning of the link-layer header (i.e.,
+ * they don't include off_ll).
*
* If the link layer never uses 802.2 LLC:
*
static int linktype;
static void
-init_linktype(type)
- int type;
+init_linktype(p)
+ pcap_t *p;
{
- linktype = type;
+ linktype = pcap_datalink(p);
+#ifdef PCAP_FDDIPAD
+ pcap_fddipad = p->fddipad;
+#endif
/*
* Assume it's not raw ATM with a pseudo-header, for now.
off_proto = -1;
off_payload = -1;
+ /*
+ * And assume we're not doing SS7.
+ */
+ off_li = -1;
+ off_sio = -1;
+ off_opc = -1;
+ off_dpc = -1;
+ off_sls = -1;
+
+ /*
+ * Also assume it's not 802.11 with a fixed-length radio header.
+ */
+ off_ll = 0;
+
orig_linktype = -1;
orig_nl = -1;
- orig_nl_nosnap = -1;
+ label_stack_depth = 0;
- switch (type) {
+ reg_ll_size = -1;
+
+ switch (linktype) {
case DLT_ARCNET:
off_linktype = 2;
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_PPP_PPPD:
case DLT_C_HDLC: /* BSD/OS Cisco HDLC */
case DLT_PPP_SERIAL: /* NetBSD sync/async serial PPP */
off_linktype = 2;
*
* 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.
+ * data frames in networks with no bridges. If the
+ * fromds and tods 802.11 header bits are both set,
+ * it's actually supposed to be 30 bytes.
*/
off_linktype = 24;
off_nl = 32; /* 802.11+802.2+SNAP */
* 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 */
+ off_ll = 144;
+ off_linktype = 24;
+ off_nl = 32; /* Prism+802.11+802.2+SNAP */
+ off_nl_nosnap = 27; /* Prism+802.11+802.2 */
return;
- case DLT_IEEE802_11_RADIO:
+ case DLT_IEEE802_11_RADIO_AVS:
/*
* 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.
+ * The header is 64 bytes long, at least in its
+ * current incarnation.
*
* 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.
+ * of the radio header. We should handle that the
+ * same way we handle the length at the beginning
+ * of the radiotap header.
+ *
+ * XXX - in Linux, do any drivers that supply an AVS
+ * header supply a link-layer type other than
+ * ARPHRD_IEEE80211_PRISM? If so, we should map that
+ * to DLT_IEEE802_11_RADIO_AVS; if not, or if there are
+ * any drivers that supply an AVS header but supply
+ * an ARPHRD value of ARPHRD_IEEE80211_PRISM, we'll
+ * have to check the header in the generated code to
+ * determine whether it's Prism or AVS.
+ */
+ off_ll = 64;
+ off_linktype = 24;
+ off_nl = 32; /* Radio+802.11+802.2+SNAP */
+ off_nl_nosnap = 27; /* Radio+802.11+802.2 */
+ return;
+
+
+ /*
+ * At the moment we treat PPI as normal Radiotap encoded
+ * packets. The difference is in the function that generates
+ * the code at the beginning to compute the header length.
+ * Since this code generator of PPI supports bare 802.11
+ * encapsulation only (i.e. the encapsulated DLT should be
+ * DLT_IEEE802_11) we generate code to check for this too.
+ */
+ case DLT_PPI:
+ 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 radiotap header is variable length, and we
+ * generate code to compute its length and store it
+ * in a register. These offsets are relative to the
+ * beginning of the 802.11 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 */
+ off_linktype = 24;
+ off_nl = 32; /* 802.11+802.2+SNAP */
+ off_nl_nosnap = 27; /* 802.11+802.2 */
return;
case DLT_ATM_RFC1483:
/*
* assume routed, non-ISO PDUs
* (i.e., LLC = 0xAA-AA-03, OUT = 0x00-00-00)
+ *
+ * XXX - what about ISO PDUs, e.g. CLNP, ISIS, ESIS,
+ * or PPP with the PPP NLPID (e.g., PPPoA)? The
+ * latter would presumably be treated the way PPPoE
+ * should be, so you can do "pppoe and udp port 2049"
+ * or "pppoa and tcp port 80" and have it check for
+ * PPPo{A,E} and a PPP protocol of IP and....
*/
off_linktype = 0;
off_nl = 8; /* 802.2+SNAP */
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_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 = 0;
off_nl_nosnap = 0; /* no 802.2 LLC */
return;
+
+ /*
+ * the only BPF-interesting FRF.16 frames are non-control frames;
+ * Frame Relay has a variable length link-layer
+ * so lets start with offset 4 for now and increments later on (FIXME);
+ */
+ case DLT_MFR:
+ off_linktype = -1;
+ off_nl = 4;
+ off_nl_nosnap = 0; /* XXX - for now -> no 802.2 LLC */
+ return;
+
+ case DLT_APPLE_IP_OVER_IEEE1394:
+ off_linktype = 16;
+ off_nl = 18;
+ off_nl_nosnap = 18; /* no 802.2 LLC */
+ return;
+
+ case DLT_LINUX_IRDA:
+ /*
+ * Currently, only raw "link[N:M]" filtering is supported.
+ */
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+ case DLT_DOCSIS:
+ /*
+ * Currently, only raw "link[N:M]" filtering is supported.
+ */
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+ case DLT_SYMANTEC_FIREWALL:
+ off_linktype = 6;
+ off_nl = 44; /* Ethernet II */
+ off_nl_nosnap = 44; /* XXX - what does it do with 802.3 packets? */
+ return;
+
+#ifdef HAVE_NET_PFVAR_H
+ case DLT_PFLOG:
+ off_linktype = 0;
+ off_nl = PFLOG_HDRLEN;
+ off_nl_nosnap = PFLOG_HDRLEN; /* no 802.2 LLC */
+ return;
+#endif
+
+ case DLT_JUNIPER_MFR:
+ case DLT_JUNIPER_MLFR:
+ case DLT_JUNIPER_MLPPP:
+ case DLT_JUNIPER_PPP:
+ case DLT_JUNIPER_CHDLC:
+ case DLT_JUNIPER_FRELAY:
+ off_linktype = 4;
+ off_nl = 4;
+ off_nl_nosnap = -1; /* no 802.2 LLC */
+ return;
+
+ case DLT_JUNIPER_ATM1:
+ off_linktype = 4; /* in reality variable between 4-8 */
+ off_nl = 4;
+ off_nl_nosnap = 14;
+ return;
+
+ case DLT_JUNIPER_ATM2:
+ off_linktype = 8; /* in reality variable between 8-12 */
+ off_nl = 8;
+ off_nl_nosnap = 18;
+ return;
+
+ /* frames captured on a Juniper PPPoE service PIC
+ * contain raw ethernet frames */
+ case DLT_JUNIPER_PPPOE:
+ case DLT_JUNIPER_ETHER:
+ off_linktype = 16;
+ off_nl = 18; /* Ethernet II */
+ off_nl_nosnap = 21; /* 802.3+802.2 */
+ return;
+
+ case DLT_JUNIPER_PPPOE_ATM:
+ off_linktype = 4;
+ off_nl = 6;
+ off_nl_nosnap = -1; /* no 802.2 LLC */
+ return;
+
+ case DLT_JUNIPER_GGSN:
+ off_linktype = 6;
+ off_nl = 12;
+ off_nl_nosnap = -1; /* no 802.2 LLC */
+ return;
+
+ case DLT_JUNIPER_ES:
+ off_linktype = 6;
+ off_nl = -1; /* not really a network layer but raw IP adresses */
+ off_nl_nosnap = -1; /* no 802.2 LLC */
+ return;
+
+ case DLT_JUNIPER_MONITOR:
+ off_linktype = 12;
+ off_nl = 12; /* raw IP/IP6 header */
+ off_nl_nosnap = -1; /* no 802.2 LLC */
+ return;
+
+ case DLT_JUNIPER_SERVICES:
+ off_linktype = 12;
+ off_nl = -1; /* L3 proto location dep. on cookie type */
+ off_nl_nosnap = -1; /* no 802.2 LLC */
+ return;
+
+ case DLT_JUNIPER_VP:
+ off_linktype = 18;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+ case DLT_MTP2:
+ off_li = 2;
+ off_sio = 3;
+ off_opc = 4;
+ off_dpc = 4;
+ off_sls = 7;
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+ case DLT_MTP2_WITH_PHDR:
+ off_li = 6;
+ off_sio = 7;
+ off_opc = 8;
+ off_dpc = 8;
+ off_sls = 11;
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+#ifdef DLT_PFSYNC
+ case DLT_PFSYNC:
+ off_linktype = -1;
+ off_nl = 4;
+ off_nl_nosnap = 4;
+ return;
+#endif
+
+ case DLT_LINUX_LAPD:
+ /*
+ * Currently, only raw "link[N:M]" filtering is supported.
+ */
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+ case DLT_USB:
+ /*
+ * Currently, only raw "link[N:M]" filtering is supported.
+ */
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
+ case DLT_BLUETOOTH_HCI_H4:
+ /*
+ * Currently, only raw "link[N:M]" filtering is supported.
+ */
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
}
bpf_error("unknown data link type %d", linktype);
/* NOTREACHED */
}
-static struct block *
-gen_uncond(rsense)
- int rsense;
+/*
+ * Load a value relative to the beginning of the link-layer header.
+ * The link-layer header doesn't necessarily begin at the beginning
+ * of the packet data; there might be a variable-length prefix containing
+ * radio information.
+ */
+static struct slist *
+gen_load_llrel(offset, size)
+ u_int offset, size;
{
- struct block *b;
- struct slist *s;
-
- s = new_stmt(BPF_LD|BPF_IMM);
- s->s.k = !rsense;
- b = new_block(JMP(BPF_JEQ));
- b->stmts = s;
+ struct slist *s, *s2;
- return b;
-}
+ s = gen_llprefixlen();
-static inline struct block *
-gen_true()
-{
- return gen_uncond(1);
+ /*
+ * If "s" is non-null, it has code to arrange that the X register
+ * contains the length of the prefix preceding the link-layer
+ * header.
+ *
+ * Otherwise, the length of the prefix preceding the link-layer
+ * header is "off_ll".
+ */
+ if (s != NULL) {
+ /*
+ * There's a variable-length prefix preceding the
+ * link-layer header. "s" points to a list of statements
+ * that put the length of that prefix into the X register.
+ * do an indirect load, to use the X register as an offset.
+ */
+ s2 = new_stmt(BPF_LD|BPF_IND|size);
+ s2->s.k = offset;
+ sappend(s, s2);
+ } else {
+ /*
+ * There is no variable-length header preceding the
+ * link-layer header; add in off_ll, which, if there's
+ * a fixed-length header preceding the link-layer header,
+ * is the length of that header.
+ */
+ s = new_stmt(BPF_LD|BPF_ABS|size);
+ s->s.k = offset + off_ll;
+ }
+ return s;
}
-static inline struct block *
-gen_false()
-{
- 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.)
+ * Load a value relative to the beginning of the specified header.
*/
-#define SWAPLONG(y) \
-((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
-
-static struct block *
-gen_ether_linktype(proto)
- register int proto;
+static struct slist *
+gen_load_a(offrel, offset, size)
+ enum e_offrel offrel;
+ u_int offset, size;
{
- struct block *b0, *b1;
+ struct slist *s, *s2;
- switch (proto) {
+ switch (offrel) {
- case LLCSAP_ISONS:
+ case OR_PACKET:
+ s = new_stmt(BPF_LD|BPF_ABS|size);
+ s->s.k = offset;
+ break;
+
+ case OR_LINK:
+ s = gen_load_llrel(offset, size);
+ break;
+
+ case OR_NET:
+ s = gen_load_llrel(off_nl + offset, size);
+ break;
+
+ case OR_NET_NOSNAP:
+ s = gen_load_llrel(off_nl_nosnap + offset, size);
+ break;
+
+ case OR_TRAN_IPV4:
/*
- * 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?
+ * Load the X register with the length of the IPv4 header
+ * (plus the offset of the link-layer header, if it's
+ * preceded by a variable-length header such as a radio
+ * header), in bytes.
*/
- 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;
+ s = gen_loadx_iphdrlen();
- 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;
+ /*
+ * Load the item at {offset of the link-layer header} +
+ * {offset, relative to the start of the link-layer
+ * header, of the IPv4 header} + {length of the IPv4 header} +
+ * {specified offset}.
+ *
+ * (If the link-layer is variable-length, it's included
+ * in the value in the X register, and off_ll is 0.)
+ */
+ s2 = new_stmt(BPF_LD|BPF_IND|size);
+ s2->s.k = off_ll + off_nl + offset;
+ sappend(s, s2);
+ break;
+
+ case OR_TRAN_IPV6:
+ s = gen_load_llrel(off_nl + 40 + offset, size);
+ break;
+
+ default:
+ abort();
+ return NULL;
+ }
+ return s;
+}
+
+/*
+ * Generate code to load into the X register the sum of the length of
+ * the IPv4 header and any variable-length header preceding the link-layer
+ * header.
+ */
+static struct slist *
+gen_loadx_iphdrlen()
+{
+ struct slist *s, *s2;
+
+ s = gen_llprefixlen();
+ if (s != NULL) {
+ /*
+ * There's a variable-length prefix preceding the
+ * link-layer header. "s" points to a list of statements
+ * that put the length of that prefix into the X register.
+ * The 4*([k]&0xf) addressing mode can't be used, as we
+ * don't have a constant offset, so we have to load the
+ * value in question into the A register and add to it
+ * the value from the X register.
+ */
+ s2 = new_stmt(BPF_LD|BPF_IND|BPF_B);
+ s2->s.k = off_nl;
+ sappend(s, s2);
+ s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K);
+ s2->s.k = 0xf;
+ sappend(s, s2);
+ s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K);
+ s2->s.k = 2;
+ sappend(s, s2);
+
+ /*
+ * The A register now contains the length of the
+ * IP header. We need to add to it the length
+ * of the prefix preceding the link-layer
+ * header, which is still in the X register, and
+ * move the result into the X register.
+ */
+ sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
+ sappend(s, new_stmt(BPF_MISC|BPF_TAX));
+ } else {
+ /*
+ * There is no variable-length header preceding the
+ * link-layer header; add in off_ll, which, if there's
+ * a fixed-length header preceding the link-layer header,
+ * is the length of that header.
+ */
+ s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
+ s->s.k = off_ll + off_nl;
+ }
+ return s;
+}
+
+static struct block *
+gen_uncond(rsense)
+ int rsense;
+{
+ struct block *b;
+ struct slist *s;
+
+ s = new_stmt(BPF_LD|BPF_IMM);
+ s->s.k = !rsense;
+ b = new_block(JMP(BPF_JEQ));
+ b->stmts = s;
+
+ return b;
+}
+static inline struct block *
+gen_true()
+{
+ return gen_uncond(1);
+}
+
+static inline struct block *
+gen_false()
+{
+ 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))
+
+/*
+ * Generate code to match a particular packet type.
+ *
+ * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP
+ * value, if <= ETHERMTU. We use that to determine whether to
+ * match the type/length field or to check the type/length field for
+ * a value <= ETHERMTU to see whether it's a type field and then do
+ * the appropriate test.
+ */
+static struct block *
+gen_ether_linktype(proto)
+ register int proto;
+{
+ struct block *b0, *b1;
+
+ switch (proto) {
+
+ case LLCSAP_ISONS:
+ case LLCSAP_IP:
case LLCSAP_NETBEUI:
/*
- * NetBEUI always uses 802.2 encapsulation.
+ * OSI protocols and NetBEUI always use 802.2 encapsulation,
+ * so we check the DSAP and SSAP.
+ *
+ * LLCSAP_IP checks for IP-over-802.2, rather
+ * than IP-over-Ethernet or IP-over-SNAP.
+ *
* XXX - should we check both the DSAP and the
* SSAP, like this, or should we check just the
- * DSAP?
+ * DSAP, as we do for other types <= ETHERMTU
+ * (i.e., other SAP values)?
*/
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
- b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
- ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+ b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_H, (bpf_int32)
+ ((proto << 8) | proto));
gen_and(b0, b1);
return b1;
* 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);
+ b0 = gen_cmp(OR_LINK, off_linktype + 2, BPF_B,
+ (bpf_int32)LLCSAP_IPX);
+ b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_H,
+ (bpf_int32)0xFFFF);
gen_or(b0, b1);
/*
* Now we generate code to check for 802.3
* frames in general.
*/
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
/*
* do that before checking for the other frame
* types.
*/
- b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)ETHERTYPE_IPX);
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
+ (bpf_int32)ETHERTYPE_IPX);
gen_or(b0, b1);
return b1;
* 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);
+ b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
/*
* phase 1?); we just check for the Ethernet
* protocol type.
*/
- b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
gen_or(b0, b1);
return b1;
* a length field, <= ETHERMTU) and
* then check the DSAP.
*/
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
- b1 = gen_cmp(off_linktype + 2, BPF_B, (bpf_int32)proto);
+ b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_B,
+ (bpf_int32)proto);
gen_and(b0, b1);
return b1;
} else {
* will fail and the frame won't match,
* which is what we want).
*/
- return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ return gen_cmp(OR_LINK, off_linktype, BPF_H,
+ (bpf_int32)proto);
}
}
}
+/*
+ * Generate code to match a particular packet type.
+ *
+ * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP
+ * value, if <= ETHERMTU. We use that to determine whether to
+ * match the type field or to check the type field for the special
+ * LINUX_SLL_P_802_2 value and then do the appropriate test.
+ */
static struct block *
-gen_linktype(proto)
+gen_linux_sll_linktype(proto)
register int proto;
{
- struct block *b0, *b1, *b2;
+ struct block *b0, *b1;
- switch (linktype) {
+ switch (proto) {
- case DLT_EN10MB:
- return gen_ether_linktype(proto);
- break;
+ case LLCSAP_ISONS:
+ case LLCSAP_IP:
+ case LLCSAP_NETBEUI:
+ /*
+ * OSI protocols and NetBEUI always use 802.2 encapsulation,
+ * so we check the DSAP and SSAP.
+ *
+ * LLCSAP_IP checks for IP-over-802.2, rather
+ * than IP-over-Ethernet or IP-over-SNAP.
+ *
+ * XXX - should we check both the DSAP and the
+ * SSAP, like this, or should we check just the
+ * DSAP, as we do for other types <= ETHERMTU
+ * (i.e., other SAP values)?
+ */
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_H, (bpf_int32)
+ ((proto << 8) | proto));
+ gen_and(b0, b1);
+ return b1;
- case DLT_C_HDLC:
- switch (proto) {
+ 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(OR_LINK, 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(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ gen_and(b0, b1);
- case LLCSAP_ISONS:
- proto = (proto << 8 | LLCSAP_ISONS);
- /* fall through */
+ /*
+ * Now check for 802.3 frames and OR that with
+ * the previous test.
+ */
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_3);
+ gen_or(b0, b1);
- default:
- return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
- break;
- }
- break;
+ /*
+ * Now add the check for Ethernet_II frames, and
+ * do that before checking for the other frame
+ * types.
+ */
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
+ (bpf_int32)ETHERTYPE_IPX);
+ gen_or(b0, b1);
+ return b1;
- 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;
+ case ETHERTYPE_ATALK:
+ case ETHERTYPE_AARP:
+ /*
+ * EtherTalk (AppleTalk protocols on Ethernet link
+ * layer) may use 802.2 encapsulation.
+ */
- 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.
+ * Check for 802.2 encapsulation (EtherTalk phase 2?);
+ * we check for the 802.2 protocol type in the
+ * "Ethernet type" field.
+ */
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2);
+
+ /*
+ * 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).
*
- * We assume LANE means Ethernet, not Token Ring.
+ * 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 (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);
+ 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);
+
+ /*
+ * Check for Ethernet encapsulation (Ethertalk
+ * phase 1?); we just check for the Ethernet
+ * protocol type.
+ */
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
+ gen_or(b0, b1);
+ return b1;
+
+ default:
+ if (proto <= ETHERMTU) {
/*
- * Now generate an Ethernet test.
+ * 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.
*/
- b1 = gen_ether_linktype(proto);
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
+ LINUX_SLL_P_802_2);
+ b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_B,
+ (bpf_int32)proto);
gen_and(b0, b1);
return b1;
} else {
/*
- * Check for LLC encapsulation and then check the
- * protocol.
+ * 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).
*/
- b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
- b1 = gen_llc(proto);
- gen_and(b0, b1);
- return b1;
+ return gen_cmp(OR_LINK, off_linktype, BPF_H,
+ (bpf_int32)proto);
}
+ }
+}
- case DLT_LINUX_SLL:
+static void
+insert_radiotap_load_llprefixlen(b)
+ struct block *b;
+{
+ struct slist *s1, *s2;
+
+ /*
+ * Prepend to the statements in this block code to load the
+ * length of the radiotap header into the register assigned
+ * to hold that length, if one has been assigned.
+ */
+ if (reg_ll_size != -1) {
+ /*
+ * The 2 bytes at offsets of 2 and 3 from the beginning
+ * of the radiotap header are the length of the radiotap
+ * header; unfortunately, it's little-endian, so we have
+ * to load it a byte at a time and construct the value.
+ */
+
+ /*
+ * Load the high-order byte, at an offset of 3, shift it
+ * left a byte, and put the result in the X register.
+ */
+ s1 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s1->s.k = 3;
+ s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K);
+ sappend(s1, s2);
+ s2->s.k = 8;
+ s2 = new_stmt(BPF_MISC|BPF_TAX);
+ sappend(s1, s2);
+
+ /*
+ * Load the next byte, at an offset of 2, and OR the
+ * value from the X register into it.
+ */
+ s2 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ sappend(s1, s2);
+ s2->s.k = 2;
+ s2 = new_stmt(BPF_ALU|BPF_OR|BPF_X);
+ sappend(s1, s2);
+
+ /*
+ * Now allocate a register to hold that value and store
+ * it.
+ */
+ s2 = new_stmt(BPF_ST);
+ s2->s.k = reg_ll_size;
+ sappend(s1, s2);
+
+ /*
+ * Now move it into the X register.
+ */
+ s2 = new_stmt(BPF_MISC|BPF_TAX);
+ sappend(s1, s2);
+
+ /*
+ * Now append all the existing statements in this
+ * block to these statements.
+ */
+ sappend(s1, b->stmts);
+ b->stmts = s1;
+ }
+}
+
+/*
+ * At the moment we treat PPI as normal Radiotap encoded
+ * packets. The difference is in the function that generates
+ * the code at the beginning to compute the header length.
+ * Since this code generator of PPI supports bare 802.11
+ * encapsulation only (i.e. the encapsulated DLT should be
+ * DLT_IEEE802_11) we generate code to check for this too.
+ */
+static void
+insert_ppi_load_llprefixlen(b)
+ struct block *b;
+{
+ struct slist *s1, *s2;
+
+ /*
+ * Prepend to the statements in this block code to load the
+ * length of the radiotap header into the register assigned
+ * to hold that length, if one has been assigned.
+ */
+ if (reg_ll_size != -1) {
+ /*
+ * The 2 bytes at offsets of 2 and 3 from the beginning
+ * of the radiotap header are the length of the radiotap
+ * header; unfortunately, it's little-endian, so we have
+ * to load it a byte at a time and construct the value.
+ */
+
+ /*
+ * Load the high-order byte, at an offset of 3, shift it
+ * left a byte, and put the result in the X register.
+ */
+ s1 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s1->s.k = 3;
+ s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K);
+ sappend(s1, s2);
+ s2->s.k = 8;
+ s2 = new_stmt(BPF_MISC|BPF_TAX);
+ sappend(s1, s2);
+
+ /*
+ * Load the next byte, at an offset of 2, and OR the
+ * value from the X register into it.
+ */
+ s2 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ sappend(s1, s2);
+ s2->s.k = 2;
+ s2 = new_stmt(BPF_ALU|BPF_OR|BPF_X);
+ sappend(s1, s2);
+
+ /*
+ * Now allocate a register to hold that value and store
+ * it.
+ */
+ s2 = new_stmt(BPF_ST);
+ s2->s.k = reg_ll_size;
+ sappend(s1, s2);
+
+ /*
+ * Now move it into the X register.
+ */
+ s2 = new_stmt(BPF_MISC|BPF_TAX);
+ sappend(s1, s2);
+
+ /*
+ * Now append all the existing statements in this
+ * block to these statements.
+ */
+ sappend(s1, b->stmts);
+ b->stmts = s1;
+
+ }
+}
+
+static struct block *
+gen_ppi_dlt_check(void)
+{
+ struct slist *s_load_dlt;
+ struct block *b;
+
+ if (linktype == DLT_PPI)
+ {
+ /* Create the statements that check for the DLT
+ */
+ s_load_dlt = new_stmt(BPF_LD|BPF_W|BPF_ABS);
+ s_load_dlt->s.k = 4;
+
+ b = new_block(JMP(BPF_JEQ));
+
+ b->stmts = s_load_dlt;
+ b->s.k = SWAPLONG(DLT_IEEE802_11);
+ }
+ else
+ {
+ b = NULL;
+ }
+
+ return b;
+}
+
+static void
+insert_load_llprefixlen(b)
+ struct block *b;
+{
+ switch (linktype) {
+
+ /*
+ * At the moment we treat PPI as normal Radiotap encoded
+ * packets. The difference is in the function that generates
+ * the code at the beginning to compute the header length.
+ * Since this code generator of PPI supports bare 802.11
+ * encapsulation only (i.e. the encapsulated DLT should be
+ * DLT_IEEE802_11) we generate code to check for this too.
+ */
+ case DLT_PPI:
+ insert_ppi_load_llprefixlen(b);
+ break;
+
+ case DLT_IEEE802_11_RADIO:
+ insert_radiotap_load_llprefixlen(b);
+ break;
+ }
+}
+
+
+static struct slist *
+gen_radiotap_llprefixlen(void)
+{
+ struct slist *s;
+
+ if (reg_ll_size == -1) {
+ /*
+ * We haven't yet assigned a register for the length
+ * of the radiotap header; allocate one.
+ */
+ reg_ll_size = alloc_reg();
+ }
+
+ /*
+ * Load the register containing the radiotap length
+ * into the X register.
+ */
+ s = new_stmt(BPF_LDX|BPF_MEM);
+ s->s.k = reg_ll_size;
+ return s;
+}
+
+/*
+ * At the moment we treat PPI as normal Radiotap encoded
+ * packets. The difference is in the function that generates
+ * the code at the beginning to compute the header length.
+ * Since this code generator of PPI supports bare 802.11
+ * encapsulation only (i.e. the encapsulated DLT should be
+ * DLT_IEEE802_11) we generate code to check for this too.
+ */
+static struct slist *
+gen_ppi_llprefixlen(void)
+{
+ struct slist *s;
+
+ if (reg_ll_size == -1) {
+ /*
+ * We haven't yet assigned a register for the length
+ * of the radiotap header; allocate one.
+ */
+ reg_ll_size = alloc_reg();
+ }
+
+ /*
+ * Load the register containing the radiotap length
+ * into the X register.
+ */
+ s = new_stmt(BPF_LDX|BPF_MEM);
+ s->s.k = reg_ll_size;
+ return s;
+}
+
+
+
+/*
+ * Generate code to compute the link-layer header length, if necessary,
+ * putting it into the X register, and to return either a pointer to a
+ * "struct slist" for the list of statements in that code, or NULL if
+ * no code is necessary.
+ */
+static struct slist *
+gen_llprefixlen(void)
+{
+ switch (linktype) {
+
+ case DLT_PPI:
+ return gen_ppi_llprefixlen();
+
+
+ case DLT_IEEE802_11_RADIO:
+ return gen_radiotap_llprefixlen();
+
+ default:
+ return NULL;
+ }
+}
+
+/*
+ * Generate code to match a particular packet type by matching the
+ * link-layer type field or fields in the 802.2 LLC header.
+ *
+ * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP
+ * value, if <= ETHERMTU.
+ */
+static struct block *
+gen_linktype(proto)
+ register int proto;
+{
+ struct block *b0, *b1, *b2;
+
+ /* are we checking MPLS-encapsulated packets? */
+ if (label_stack_depth > 0) {
switch (proto) {
+ case ETHERTYPE_IP:
+ case PPP_IP:
+ /* FIXME add other L3 proto IDs */
+ return gen_mpls_linktype(Q_IP);
- 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 ETHERTYPE_IPV6:
+ case PPP_IPV6:
+ /* FIXME add other L3 proto IDs */
+ return gen_mpls_linktype(Q_IPV6);
- 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;
+ default:
+ bpf_error("unsupported protocol over mpls");
+ /* NOTREACHED */
+ }
+ }
- 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 (linktype) {
- 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 DLT_EN10MB:
+ return gen_ether_linktype(proto);
+ /*NOTREACHED*/
+ break;
- /*
- * 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 DLT_C_HDLC:
+ switch (proto) {
- /*
- * 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 LLCSAP_ISONS:
+ proto = (proto << 8 | LLCSAP_ISONS);
+ /* fall through */
- case ETHERTYPE_ATALK:
- case ETHERTYPE_AARP:
- /*
- * EtherTalk (AppleTalk protocols on Ethernet link
- * layer) may use 802.2 encapsulation.
- */
+ default:
+ return gen_cmp(OR_LINK, off_linktype, BPF_H,
+ (bpf_int32)proto);
+ /*NOTREACHED*/
+ break;
+ }
+ break;
+
+ case DLT_PPI:
+ case DLT_FDDI:
+ case DLT_IEEE802:
+ case DLT_IEEE802_11:
+ case DLT_IEEE802_11_RADIO_AVS:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_PRISM_HEADER:
+ case DLT_ATM_RFC1483:
+ case DLT_ATM_CLIP:
+ case DLT_IP_OVER_FC:
+ return gen_llc_linktype(proto);
+ /*NOTREACHED*/
+ break;
+ 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 for 802.2 encapsulation (EtherTalk phase 2?);
- * we check for the 802.2 protocol type in the
- * "Ethernet type" field.
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
*/
- b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
+ b0 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
+ gen_not(b0);
/*
- * 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).
+ * Now generate an Ethernet test.
*/
- 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);
+ b1 = gen_ether_linktype(proto);
gen_and(b0, b1);
-
+ return b1;
+ } else {
/*
- * Check for Ethernet encapsulation (Ethertalk
- * phase 1?); we just check for the Ethernet
- * protocol type.
+ * Check for LLC encapsulation and then check the
+ * protocol.
*/
- b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
-
- gen_or(b0, b1);
+ b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
+ b1 = gen_llc_linktype(proto);
+ gen_and(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);
- }
}
+ /*NOTREACHED*/
+ break;
+
+ case DLT_LINUX_SLL:
+ return gen_linux_sll_linktype(proto);
+ /*NOTREACHED*/
break;
case DLT_SLIP:
case DLT_RAW:
/*
* These types don't provide any type field; packets
- * are always IP.
+ * are always IPv4 or IPv6.
*
* XXX - for IPv4, check for a version number of 4, and,
* for IPv6, check for a version number of 6?
switch (proto) {
case ETHERTYPE_IP:
+ /* Check for a version number of 4. */
+ return gen_mcmp(OR_LINK, 0, BPF_B, 0x40, 0xF0);
#ifdef INET6
case ETHERTYPE_IPV6:
+ /* Check for a version number of 6. */
+ return gen_mcmp(OR_LINK, 0, BPF_B, 0x60, 0xF0);
#endif
- return gen_true(); /* always true */
default:
return gen_false(); /* always false */
}
+ /*NOTREACHED*/
break;
case DLT_PPP:
+ case DLT_PPP_PPPD:
case DLT_PPP_SERIAL:
case DLT_PPP_ETHER:
/*
switch (proto) {
case ETHERTYPE_IP:
- b0 = gen_cmp(off_linktype, BPF_H, PPP_IP);
- b1 = gen_cmp(off_linktype, BPF_H, PPP_VJC);
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_IP);
+ b1 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_VJC);
gen_or(b0, b1);
- b0 = gen_cmp(off_linktype, BPF_H, PPP_VJNC);
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_VJNC);
gen_or(b1, b0);
return b0;
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,
* 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) {
proto = SWAPLONG(proto);
proto = htonl(proto);
}
- return (gen_cmp(0, BPF_W, (bpf_int32)proto));
+ return (gen_cmp(OR_LINK, 0, BPF_W, (bpf_int32)proto));
+
+#ifdef HAVE_NET_PFVAR_H
+ case DLT_PFLOG:
+ /*
+ * af field is host byte order in contrast to the rest of
+ * the packet.
+ */
+ if (proto == ETHERTYPE_IP)
+ return (gen_cmp(OR_LINK, offsetof(struct pfloghdr, af),
+ BPF_B, (bpf_int32)AF_INET));
+#ifdef INET6
+ else if (proto == ETHERTYPE_IPV6)
+ return (gen_cmp(OR_LINK, offsetof(struct pfloghdr, af),
+ BPF_B, (bpf_int32)AF_INET6));
+#endif /* INET6 */
+ else
+ return gen_false();
+ /*NOTREACHED*/
+ break;
+#endif /* HAVE_NET_PFVAR_H */
case DLT_ARCNET:
case DLT_ARCNET_LINUX:
#ifdef INET6
case ETHERTYPE_IPV6:
- return (gen_cmp(off_linktype, BPF_B,
+ return (gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_INET6));
#endif /* INET6 */
case ETHERTYPE_IP:
- b0 = gen_cmp(off_linktype, BPF_B,
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_IP);
- b1 = gen_cmp(off_linktype, BPF_B,
+ b1 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_IP_OLD);
gen_or(b0, b1);
return (b1);
case ETHERTYPE_ARP:
- b0 = gen_cmp(off_linktype, BPF_B,
+ b0 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_ARP);
- b1 = gen_cmp(off_linktype, BPF_B,
+ b1 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_ARP_OLD);
gen_or(b0, b1);
return (b1);
case ETHERTYPE_REVARP:
- return (gen_cmp(off_linktype, BPF_B,
+ return (gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_REVARP));
case ETHERTYPE_ATALK:
- return (gen_cmp(off_linktype, BPF_B,
+ return (gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_ATALK));
}
+ /*NOTREACHED*/
break;
case DLT_LTALK:
default:
return gen_false();
}
+ /*NOTREACHED*/
break;
case DLT_FRELAY:
/*
* Check for the special NLPID for IP.
*/
- return gen_cmp(2, BPF_H, (0x03<<8) | 0xcc);
+ return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | 0xcc);
#ifdef INET6
case ETHERTYPE_IPV6:
/*
* Check for the special NLPID for IPv6.
*/
- return gen_cmp(2, BPF_H, (0x03<<8) | 0x8e);
+ return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | 0x8e);
#endif
case LLCSAP_ISONS:
* 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);
+ b0 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO8473_CLNP);
+ b1 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO9542_ESIS);
+ b2 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO10589_ISIS);
gen_or(b1, b2);
gen_or(b0, b2);
return b2;
default:
return gen_false();
}
+ /*NOTREACHED*/
break;
+
+ case DLT_JUNIPER_MFR:
+ case DLT_JUNIPER_MLFR:
+ case DLT_JUNIPER_MLPPP:
+ case DLT_JUNIPER_ATM1:
+ case DLT_JUNIPER_ATM2:
+ case DLT_JUNIPER_PPPOE:
+ case DLT_JUNIPER_PPPOE_ATM:
+ case DLT_JUNIPER_GGSN:
+ case DLT_JUNIPER_ES:
+ case DLT_JUNIPER_MONITOR:
+ case DLT_JUNIPER_SERVICES:
+ case DLT_JUNIPER_ETHER:
+ case DLT_JUNIPER_PPP:
+ case DLT_JUNIPER_FRELAY:
+ case DLT_JUNIPER_CHDLC:
+ case DLT_JUNIPER_VP:
+ /* just lets verify the magic number for now -
+ * on ATM we may have up to 6 different encapsulations on the wire
+ * and need a lot of heuristics to figure out that the payload
+ * might be;
+ *
+ * FIXME encapsulation specific BPF_ filters
+ */
+ return gen_mcmp(OR_LINK, 0, BPF_W, 0x4d474300, 0xffffff00); /* compare the magic number */
+
+ case DLT_LINUX_IRDA:
+ bpf_error("IrDA link-layer type filtering not implemented");
+
+ case DLT_DOCSIS:
+ bpf_error("DOCSIS link-layer type filtering not implemented");
+
+ case DLT_LINUX_LAPD:
+ bpf_error("LAPD link-layer type filtering not implemented");
}
/*
* at "off_linktype", so we don't have to do the code generation
* above.)
*/
- return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ return gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
}
/*
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);
+ return gen_bcmp(OR_LINK, offset, 8, snapblock);
}
/*
- * Check for a given protocol value assuming an 802.2 LLC header.
+ * Generate code to match a particular packet type, for link-layer types
+ * using 802.2 LLC headers.
+ *
+ * This is *NOT* used for Ethernet; "gen_ether_linktype()" is used
+ * for that - it handles the D/I/X Ethernet vs. 802.3+802.2 issues.
+ *
+ * "proto" is an Ethernet type value, if > ETHERMTU, or an LLC SAP
+ * value, if <= ETHERMTU. We use that to determine whether to
+ * match the DSAP or both DSAP and LSAP or to check the OUI and
+ * protocol ID in a SNAP header.
*/
static struct block *
-gen_llc(proto)
+gen_llc_linktype(proto)
int proto;
{
/*
switch (proto) {
case LLCSAP_IP:
- return gen_cmp(off_linktype, BPF_H, (long)
- ((LLCSAP_IP << 8) | LLCSAP_IP));
-
case LLCSAP_ISONS:
- return gen_cmp(off_linktype, BPF_H, (long)
- ((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
-
case LLCSAP_NETBEUI:
- return gen_cmp(off_linktype, BPF_H, (long)
- ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+ /*
+ * XXX - should we check both the DSAP and the
+ * SSAP, like this, or should we check just the
+ * DSAP, as we do for other types <= ETHERMTU
+ * (i.e., other SAP values)?
+ */
+ return gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_u_int32)
+ ((proto << 8) | proto));
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);
+ return gen_cmp(OR_LINK, off_linktype, BPF_B,
+ (bpf_int32)LLCSAP_IPX);
case ETHERTYPE_ATALK:
/*
* This is an LLC SAP value, so check
* the DSAP.
*/
- return gen_cmp(off_linktype, BPF_B, (bpf_int32)proto);
+ return gen_cmp(OR_LINK, off_linktype, BPF_B,
+ (bpf_int32)proto);
} else {
/*
* This is an Ethernet type; we assume that it's
* 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);
+ return gen_cmp(OR_LINK, off_linktype+6, BPF_H,
+ (bpf_int32)proto);
}
}
}
abort();
}
b0 = gen_linktype(proto);
- b1 = gen_mcmp(offset, BPF_W, (bpf_int32)addr, mask);
+ b1 = gen_mcmp(OR_NET, offset, BPF_W, (bpf_int32)addr, mask);
gen_and(b0, b1);
return b1;
}
/* 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]));
+ b1 = gen_mcmp(OR_NET, offset + 12, BPF_W, ntohl(a[3]), ntohl(m[3]));
+ b0 = gen_mcmp(OR_NET, 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]));
+ b0 = gen_mcmp(OR_NET, 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]));
+ b0 = gen_mcmp(OR_NET, offset + 0, BPF_W, ntohl(a[0]), ntohl(m[0]));
gen_and(b0, b1);
b0 = gen_linktype(proto);
gen_and(b0, b1);
switch (dir) {
case Q_SRC:
- return gen_bcmp(off_mac + 6, 6, eaddr);
+ return gen_bcmp(OR_LINK, off_mac + 6, 6, eaddr);
case Q_DST:
- return gen_bcmp(off_mac + 0, 6, eaddr);
+ return gen_bcmp(OR_LINK, off_mac + 0, 6, eaddr);
case Q_AND:
b0 = gen_ehostop(eaddr, Q_SRC);
switch (dir) {
case Q_SRC:
#ifdef PCAP_FDDIPAD
- return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr);
+ return gen_bcmp(OR_LINK, 6 + 1 + pcap_fddipad, 6, eaddr);
#else
- return gen_bcmp(6 + 1, 6, eaddr);
+ return gen_bcmp(OR_LINK, 6 + 1, 6, eaddr);
#endif
case Q_DST:
#ifdef PCAP_FDDIPAD
- return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr);
+ return gen_bcmp(OR_LINK, 0 + 1 + pcap_fddipad, 6, eaddr);
#else
- return gen_bcmp(0 + 1, 6, eaddr);
+ return gen_bcmp(OR_LINK, 0 + 1, 6, eaddr);
#endif
case Q_AND:
switch (dir) {
case Q_SRC:
- return gen_bcmp(8, 6, eaddr);
+ return gen_bcmp(OR_LINK, 8, 6, eaddr);
case Q_DST:
- return gen_bcmp(2, 6, eaddr);
+ return gen_bcmp(OR_LINK, 2, 6, eaddr);
case Q_AND:
b0 = gen_thostop(eaddr, Q_SRC);
*
* 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;
+ s = gen_load_a(OR_LINK, 1, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x01; /* To DS */
b1->stmts = s;
/*
* If To DS is set, the SA is at 24.
*/
- b0 = gen_bcmp(24, 6, eaddr);
+ b0 = gen_bcmp(OR_LINK, 24, 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;
+ s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x01; /* To DS */
b2->stmts = s;
/*
* If To DS is not set, the SA is at 16.
*/
- b1 = gen_bcmp(16, 6, eaddr);
+ b1 = gen_bcmp(OR_LINK, 16, 6, eaddr);
gen_and(b2, b1);
/*
* 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;
+ s = gen_load_a(OR_LINK, 1, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x02; /* From DS */
b1->stmts = s;
/*
* Now check for data frames with From DS not set.
*/
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 1;
+ s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x02; /* From DS */
b2->stmts = s;
/*
* If From DS isn't set, the SA is at 10.
*/
- b1 = gen_bcmp(10, 6, eaddr);
+ b1 = gen_bcmp(OR_LINK, 10, 6, eaddr);
gen_and(b2, b1);
/*
* 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;
+ gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x08;
b1->stmts = s;
* is a management frame.
* I.e, check "!(link[0] & 0x08)".
*/
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 0;
+ s = gen_load_a(OR_LINK, 0, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x08;
b2->stmts = s;
/*
* For management frames, the SA is at 10.
*/
- b1 = gen_bcmp(10, 6, eaddr);
+ b1 = gen_bcmp(OR_LINK, 10, 6, eaddr);
gen_and(b2, b1);
/*
*
* I.e., check "!(link[0] & 0x04)".
*/
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 0;
+ s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x04;
b1->stmts = s;
*
* First, check for To DS set, i.e. "link[1] & 0x01".
*/
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 1;
+ s = gen_load_a(OR_LINK, 1, BPF_B);
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);
+ b0 = gen_bcmp(OR_LINK, 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;
+ s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x01; /* To DS */
b2->stmts = s;
/*
* If To DS is not set, the DA is at 4.
*/
- b1 = gen_bcmp(4, 6, eaddr);
+ b1 = gen_bcmp(OR_LINK, 4, 6, eaddr);
gen_and(b2, b1);
/*
* 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;
+ s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x08;
b1->stmts = s;
* is a management frame.
* I.e, check "!(link[0] & 0x08)".
*/
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 0;
+ s = gen_load_a(OR_LINK, 0, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x08;
b2->stmts = s;
/*
* For management frames, the DA is at 4.
*/
- b1 = gen_bcmp(4, 6, eaddr);
+ b1 = gen_bcmp(OR_LINK, 4, 6, eaddr);
gen_and(b2, b1);
/*
*
* I.e., check "!(link[0] & 0x04)".
*/
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 0;
+ s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x04;
b1->stmts = s;
switch (dir) {
case Q_SRC:
- return gen_bcmp(10, 6, eaddr);
+ return gen_bcmp(OR_LINK, 10, 6, eaddr);
case Q_DST:
- return gen_bcmp(2, 6, eaddr);
+ return gen_bcmp(OR_LINK, 2, 6, eaddr);
case Q_AND:
b0 = gen_ipfchostop(eaddr, Q_SRC);
* and not generate masking instructions if the mask is 0xFFFF.
*/
static struct block *
-gen_dnhostop(addr, dir, base_off)
+gen_dnhostop(addr, dir)
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 */
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);
+ b0 = gen_dnhostop(addr, Q_SRC);
+ b1 = gen_dnhostop(addr, Q_DST);
gen_and(b0, b1);
return b1;
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);
+ b0 = gen_dnhostop(addr, Q_SRC);
+ b1 = gen_dnhostop(addr, Q_DST);
gen_or(b0, b1);
return b1;
case Q_ISO:
- bpf_error("ISO host filtering not implemented");
+ bpf_error("ISO host filtering not implemented");
default:
abort();
}
b0 = gen_linktype(ETHERTYPE_DN);
/* Check for pad = 1, long header case */
- tmp = gen_mcmp(base_off + 2, BPF_H,
+ tmp = gen_mcmp(OR_NET, 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));
+ b1 = gen_cmp(OR_NET, 2 + 1 + offset_lh,
+ BPF_H, (bpf_int32)ntohs((u_short)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));
+ tmp = gen_mcmp(OR_NET, 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7);
+ b2 = gen_cmp(OR_NET, 2 + offset_lh, BPF_H, (bpf_int32)ntohs((u_short)addr));
gen_and(tmp, b2);
gen_or(b2, b1);
/* Check for pad = 1, short header case */
- tmp = gen_mcmp(base_off + 2, BPF_H,
+ tmp = gen_mcmp(OR_NET, 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));
+ b2 = gen_cmp(OR_NET, 2 + 1 + offset_sh, BPF_H, (bpf_int32)ntohs((u_short)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));
+ tmp = gen_mcmp(OR_NET, 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7);
+ b2 = gen_cmp(OR_NET, 2 + offset_sh, BPF_H, (bpf_int32)ntohs((u_short)addr));
gen_and(tmp, b2);
gen_or(b2, b1);
return b1;
}
+/*
+ * Generate a check for IPv4 or IPv6 for MPLS-encapsulated packets;
+ * test the bottom-of-stack bit, and then check the version number
+ * field in the IP header.
+ */
+static struct block *
+gen_mpls_linktype(proto)
+ int proto;
+{
+ struct block *b0, *b1;
+
+ switch (proto) {
+
+ case Q_IP:
+ /* match the bottom-of-stack bit */
+ b0 = gen_mcmp(OR_NET, -2, BPF_B, 0x01, 0x01);
+ /* match the IPv4 version number */
+ b1 = gen_mcmp(OR_NET, 0, BPF_B, 0x40, 0xf0);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_IPV6:
+ /* match the bottom-of-stack bit */
+ b0 = gen_mcmp(OR_NET, -2, BPF_B, 0x01, 0x01);
+ /* match the IPv4 version number */
+ b1 = gen_mcmp(OR_NET, 0, BPF_B, 0x60, 0xf0);
+ gen_and(b0, b1);
+ return b1;
+
+ default:
+ abort();
+ }
+}
+
static struct block *
-gen_host(addr, mask, proto, dir)
+gen_host(addr, mask, proto, dir, type)
bpf_u_int32 addr;
bpf_u_int32 mask;
int proto;
int dir;
+ int type;
{
struct block *b0, *b1;
+ const char *typestr;
+
+ if (type == Q_NET)
+ typestr = "net";
+ else
+ typestr = "host";
switch (proto) {
case Q_DEFAULT:
- b0 = gen_host(addr, mask, Q_IP, dir);
- if (off_linktype != (u_int)-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);
+ b0 = gen_host(addr, mask, Q_IP, dir, type);
+ /*
+ * Only check for non-IPv4 addresses if we're not
+ * checking MPLS-encapsulated packets.
+ */
+ if (label_stack_depth == 0) {
+ b1 = gen_host(addr, mask, Q_ARP, dir, type);
+ gen_or(b0, b1);
+ b0 = gen_host(addr, mask, Q_RARP, dir, type);
+ gen_or(b1, b0);
}
return b0;
case Q_IP:
- return gen_hostop(addr, mask, dir, ETHERTYPE_IP,
- off_nl + 12, off_nl + 16);
+ return gen_hostop(addr, mask, dir, ETHERTYPE_IP, 12, 16);
case Q_RARP:
- return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP,
- off_nl + 14, off_nl + 24);
+ return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP, 14, 24);
case Q_ARP:
- return gen_hostop(addr, mask, dir, ETHERTYPE_ARP,
- off_nl + 14, off_nl + 24);
+ return gen_hostop(addr, mask, dir, ETHERTYPE_ARP, 14, 24);
case Q_TCP:
- bpf_error("'tcp' modifier applied to host");
+ bpf_error("'tcp' modifier applied to %s", typestr);
case Q_SCTP:
- bpf_error("'sctp' modifier applied to host");
+ bpf_error("'sctp' modifier applied to %s", typestr);
case Q_UDP:
- bpf_error("'udp' modifier applied to host");
+ bpf_error("'udp' modifier applied to %s", typestr);
case Q_ICMP:
- bpf_error("'icmp' modifier applied to host");
+ bpf_error("'icmp' modifier applied to %s", typestr);
case Q_IGMP:
- bpf_error("'igmp' modifier applied to host");
+ bpf_error("'igmp' modifier applied to %s", typestr);
case Q_IGRP:
- bpf_error("'igrp' modifier applied to host");
+ bpf_error("'igrp' modifier applied to %s", typestr);
case Q_PIM:
- bpf_error("'pim' modifier applied to host");
+ bpf_error("'pim' modifier applied to %s", typestr);
case Q_VRRP:
- bpf_error("'vrrp' modifier applied to host");
+ bpf_error("'vrrp' modifier applied to %s", typestr);
case Q_ATALK:
bpf_error("ATALK host filtering not implemented");
bpf_error("AARP host filtering not implemented");
case Q_DECNET:
- return gen_dnhostop(addr, dir, off_nl);
+ return gen_dnhostop(addr, dir);
case Q_SCA:
bpf_error("SCA host filtering not implemented");
bpf_error("'ip6' modifier applied to ip host");
case Q_ICMPV6:
- bpf_error("'icmp6' modifier applied to host");
+ bpf_error("'icmp6' modifier applied to %s", typestr);
#endif /* INET6 */
case Q_AH:
- bpf_error("'ah' modifier applied to host");
+ bpf_error("'ah' modifier applied to %s", typestr);
case Q_ESP:
- bpf_error("'esp' modifier applied to host");
+ bpf_error("'esp' modifier applied to %s", typestr);
case Q_ISO:
bpf_error("ISO host filtering not implemented");
case Q_ESIS:
- bpf_error("'esis' modifier applied to host");
+ bpf_error("'esis' modifier applied to %s", typestr);
case Q_ISIS:
- bpf_error("'isis' modifier applied to host");
+ bpf_error("'isis' modifier applied to %s", typestr);
case Q_CLNP:
- bpf_error("'clnp' modifier applied to host");
+ bpf_error("'clnp' modifier applied to %s", typestr);
case Q_STP:
- bpf_error("'stp' modifier applied to host");
+ bpf_error("'stp' modifier applied to %s", typestr);
case Q_IPX:
bpf_error("IPX host filtering not implemented");
case Q_NETBEUI:
- bpf_error("'netbeui' modifier applied to host");
+ bpf_error("'netbeui' modifier applied to %s", typestr);
+
+ case Q_RADIO:
+ bpf_error("'radio' modifier applied to %s", typestr);
default:
abort();
#ifdef INET6
static struct block *
-gen_host6(addr, mask, proto, dir)
+gen_host6(addr, mask, proto, dir, type)
struct in6_addr *addr;
struct in6_addr *mask;
int proto;
int dir;
+ int type;
{
+ const char *typestr;
+
+ if (type == Q_NET)
+ typestr = "net";
+ else
+ typestr = "host";
+
switch (proto) {
case Q_DEFAULT:
- return gen_host6(addr, mask, Q_IPV6, dir);
+ return gen_host6(addr, mask, Q_IPV6, dir, type);
case Q_IP:
- bpf_error("'ip' modifier applied to ip6 host");
+ bpf_error("'ip' modifier applied to ip6 %s", typestr);
case Q_RARP:
- bpf_error("'rarp' modifier applied to ip6 host");
+ bpf_error("'rarp' modifier applied to ip6 %s", typestr);
case Q_ARP:
- bpf_error("'arp' modifier applied to ip6 host");
+ bpf_error("'arp' modifier applied to ip6 %s", typestr);
case Q_SCTP:
- bpf_error("'sctp' modifier applied to host");
+ bpf_error("'sctp' modifier applied to %s", typestr);
case Q_TCP:
- bpf_error("'tcp' modifier applied to host");
+ bpf_error("'tcp' modifier applied to %s", typestr);
case Q_UDP:
- bpf_error("'udp' modifier applied to host");
+ bpf_error("'udp' modifier applied to %s", typestr);
case Q_ICMP:
- bpf_error("'icmp' modifier applied to host");
+ bpf_error("'icmp' modifier applied to %s", typestr);
case Q_IGMP:
- bpf_error("'igmp' modifier applied to host");
+ bpf_error("'igmp' modifier applied to %s", typestr);
case Q_IGRP:
- bpf_error("'igrp' modifier applied to host");
+ bpf_error("'igrp' modifier applied to %s", typestr);
case Q_PIM:
- bpf_error("'pim' modifier applied to host");
+ bpf_error("'pim' modifier applied to %s", typestr);
case Q_VRRP:
- bpf_error("'vrrp' modifier applied to host");
+ bpf_error("'vrrp' modifier applied to %s", typestr);
case Q_ATALK:
bpf_error("ATALK host filtering not implemented");
bpf_error("AARP host filtering not implemented");
case Q_DECNET:
- bpf_error("'decnet' modifier applied to ip6 host");
+ bpf_error("'decnet' modifier applied to ip6 %s", typestr);
case Q_SCA:
bpf_error("SCA host filtering not implemented");
bpf_error("MOPRC host filtering not implemented");
case Q_IPV6:
- return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6,
- off_nl + 8, off_nl + 24);
+ return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6, 8, 24);
case Q_ICMPV6:
- bpf_error("'icmp6' modifier applied to host");
+ bpf_error("'icmp6' modifier applied to %s", typestr);
case Q_AH:
- bpf_error("'ah' modifier applied to host");
+ bpf_error("'ah' modifier applied to %s", typestr);
case Q_ESP:
- bpf_error("'esp' modifier applied to host");
+ bpf_error("'esp' modifier applied to %s", typestr);
case Q_ISO:
bpf_error("ISO host filtering not implemented");
case Q_ESIS:
- bpf_error("'esis' modifier applied to host");
+ bpf_error("'esis' modifier applied to %s", typestr);
case Q_ISIS:
- bpf_error("'isis' modifier applied to host");
+ bpf_error("'isis' modifier applied to %s", typestr);
case Q_CLNP:
- bpf_error("'clnp' modifier applied to host");
+ bpf_error("'clnp' modifier applied to %s", typestr);
case Q_STP:
- bpf_error("'stp' modifier applied to host");
+ bpf_error("'stp' modifier applied to %s", typestr);
case Q_IPX:
bpf_error("IPX host filtering not implemented");
case Q_NETBEUI:
- bpf_error("'netbeui' modifier applied to host");
+ bpf_error("'netbeui' modifier applied to %s", typestr);
+
+ case Q_RADIO:
+ bpf_error("'radio' modifier applied to %s", typestr);
default:
abort();
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) {
+ switch (linktype) {
+ case DLT_EN10MB:
+ b0 = gen_ehostop(eaddr, Q_OR);
+ break;
+ case DLT_FDDI:
+ b0 = gen_fhostop(eaddr, Q_OR);
+ break;
+ case DLT_IEEE802:
+ b0 = gen_thostop(eaddr, Q_OR);
+ break;
+ case DLT_IEEE802_11:
+ case DLT_IEEE802_11_RADIO_AVS:
+ case DLT_PPI:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_PRISM_HEADER:
+ b0 = gen_wlanhostop(eaddr, Q_OR);
+ break;
+ case DLT_SUNATM:
+ if (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);
+ b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
gen_not(b1);
/*
*/
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(
+ }
+ break;
+ case DLT_IP_OVER_FC:
+ b0 = gen_ipfchostop(eaddr, Q_OR);
+ break;
+ default:
+ bpf_error(
"'gateway' supported only on ethernet/FDDI/token ring/802.11/Fibre Channel");
-
- b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR);
+ }
+ b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR, Q_HOST);
while (*alist) {
- tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR);
+ tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR,
+ Q_HOST);
gen_or(b1, tmp);
b1 = tmp;
}
break;
case Q_ISO:
- b1 = gen_linktype(LLCSAP_ISONS);
+ b1 = gen_linktype(LLCSAP_ISONS);
break;
case Q_ESIS:
- b1 = gen_proto(ISO9542_ESIS, Q_ISO, Q_DEFAULT);
+ b1 = gen_proto(ISO9542_ESIS, Q_ISO, Q_DEFAULT);
break;
case Q_ISIS:
- b1 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
+ 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 */
+ 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);
+ b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT);
gen_or(b0, b1);
- b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
+ b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
gen_or(b0, b1);
- b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ 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 */
+ 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);
+ b0 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT);
gen_or(b0, b1);
- b0 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
+ b0 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
gen_or(b0, b1);
- b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ 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);
+ 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);
+ 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);
+ 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);
+ 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);
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
gen_or(b0, b1);
- b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
gen_or(b0, b1);
break;
case Q_ISIS_CSNP:
- b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
- b1 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
+ b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_CSNP, 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);
+ 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);
+ b1 = gen_proto(ISO8473_CLNP, Q_ISO, Q_DEFAULT);
break;
case Q_STP:
- b1 = gen_linktype(LLCSAP_8021D);
+ b1 = gen_linktype(LLCSAP_8021D);
break;
case Q_IPX:
- b1 = gen_linktype(LLCSAP_IPX);
+ b1 = gen_linktype(LLCSAP_IPX);
break;
case Q_NETBEUI:
- b1 = gen_linktype(LLCSAP_NETBEUI);
+ b1 = gen_linktype(LLCSAP_NETBEUI);
+ break;
+
+ case Q_RADIO:
+ bpf_error("'radio' is not a valid protocol type");
+
+ default:
+ abort();
+ }
+ return b1;
+}
+
+static struct block *
+gen_ipfrag()
+{
+ struct slist *s;
+ struct block *b;
+
+ /* not ip frag */
+ s = gen_load_a(OR_NET, 6, BPF_H);
+ b = new_block(JMP(BPF_JSET));
+ b->s.k = 0x1fff;
+ b->stmts = s;
+ gen_not(b);
+
+ return b;
+}
+
+/*
+ * Generate a comparison to a port value in the transport-layer header
+ * at the specified offset from the beginning of that header.
+ *
+ * XXX - this handles a variable-length prefix preceding the link-layer
+ * header, such as the radiotap or AVS radio prefix, but doesn't handle
+ * variable-length link-layer headers (such as Token Ring or 802.11
+ * headers).
+ */
+static struct block *
+gen_portatom(off, v)
+ int off;
+ bpf_int32 v;
+{
+ return gen_cmp(OR_TRAN_IPV4, off, BPF_H, v);
+}
+
+#ifdef INET6
+static struct block *
+gen_portatom6(off, v)
+ int off;
+ bpf_int32 v;
+{
+ return gen_cmp(OR_TRAN_IPV6, 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(OR_NET, 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;
+
+ /* ip6 proto 'proto' */
+ b0 = gen_cmp(OR_NET, 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_ipfrag()
+gen_port6(port, ip_proto, dir)
+ int port;
+ int ip_proto;
+ int dir;
{
- struct slist *s;
- struct block *b;
+ struct block *b0, *b1, *tmp;
- /* 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);
+ /* link proto ip6 */
+ b0 = gen_linktype(ETHERTYPE_IPV6);
- return b;
+ 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 */
+/* gen_portrange code */
static struct block *
-gen_portatom(off, v)
+gen_portrangeatom(off, v1, v2)
int off;
- bpf_int32 v;
+ bpf_int32 v1, v2;
{
- struct slist *s;
- struct block *b;
+ struct block *b1, *b2;
- s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
- s->s.k = off_nl;
+ if (v1 > v2) {
+ /*
+ * Reverse the order of the ports, so v1 is the lower one.
+ */
+ bpf_int32 vtemp;
- s->next = new_stmt(BPF_LD|BPF_IND|BPF_H);
- s->next->s.k = off_nl + off;
+ vtemp = v1;
+ v1 = v2;
+ v2 = vtemp;
+ }
- b = new_block(JMP(BPF_JEQ));
- b->stmts = s;
- b->s.k = v;
+ b1 = gen_cmp_ge(OR_TRAN_IPV4, off, BPF_H, v1);
+ b2 = gen_cmp_le(OR_TRAN_IPV4, off, BPF_H, v2);
- return b;
-}
+ gen_and(b1, b2);
-#ifdef INET6
-static struct block *
-gen_portatom6(off, v)
- int off;
- bpf_int32 v;
-{
- return gen_cmp(off_nl + 40 + off, BPF_H, v);
+ return b2;
}
-#endif/*INET6*/
struct block *
-gen_portop(port, proto, dir)
- int port, proto, dir;
+gen_portrangeop(port1, port2, proto, dir)
+ int port1, port2;
+ int proto;
+ int dir;
{
struct block *b0, *b1, *tmp;
/* ip proto 'proto' */
- tmp = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)proto);
+ tmp = gen_cmp(OR_NET, 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);
+ b1 = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_DST:
- b1 = gen_portatom(2, (bpf_int32)port);
+ b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_OR:
case Q_DEFAULT:
- tmp = gen_portatom(0, (bpf_int32)port);
- b1 = gen_portatom(2, (bpf_int32)port);
+ tmp = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2);
+ b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2);
gen_or(tmp, b1);
break;
case Q_AND:
- tmp = gen_portatom(0, (bpf_int32)port);
- b1 = gen_portatom(2, (bpf_int32)port);
+ tmp = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2);
+ b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2);
gen_and(tmp, b1);
break;
}
static struct block *
-gen_port(port, ip_proto, dir)
- int port;
+gen_portrange(port1, port2, ip_proto, dir)
+ int port1, port2;
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.
- */
+ /* link proto 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);
+ b1 = gen_portrangeop(port1, port2, ip_proto, dir);
break;
case PROTO_UNDEF:
- tmp = gen_portop(port, IPPROTO_TCP, dir);
- b1 = gen_portop(port, IPPROTO_UDP, dir);
+ tmp = gen_portrangeop(port1, port2, IPPROTO_TCP, dir);
+ b1 = gen_portrangeop(port1, port2, IPPROTO_UDP, dir);
gen_or(tmp, b1);
- tmp = gen_portop(port, IPPROTO_SCTP, dir);
+ tmp = gen_portrangeop(port1, port2, IPPROTO_SCTP, dir);
gen_or(tmp, b1);
break;
}
#ifdef INET6
+static struct block *
+gen_portrangeatom6(off, v1, v2)
+ int off;
+ bpf_int32 v1, v2;
+{
+ struct block *b1, *b2;
+
+ if (v1 > v2) {
+ /*
+ * Reverse the order of the ports, so v1 is the lower one.
+ */
+ bpf_int32 vtemp;
+
+ vtemp = v1;
+ v1 = v2;
+ v2 = vtemp;
+ }
+
+ b1 = gen_cmp_ge(OR_TRAN_IPV6, off, BPF_H, v1);
+ b2 = gen_cmp_le(OR_TRAN_IPV6, off, BPF_H, v2);
+
+ gen_and(b1, b2);
+
+ return b2;
+}
+
struct block *
-gen_portop6(port, proto, dir)
- int port, proto, dir;
+gen_portrangeop6(port1, port2, proto, dir)
+ int port1, port2;
+ int proto;
+ int dir;
{
struct block *b0, *b1, *tmp;
- /* ip proto 'proto' */
- b0 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)proto);
+ /* ip6 proto 'proto' */
+ b0 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)proto);
switch (dir) {
case Q_SRC:
- b1 = gen_portatom6(0, (bpf_int32)port);
+ b1 = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_DST:
- b1 = gen_portatom6(2, (bpf_int32)port);
+ b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_OR:
case Q_DEFAULT:
- tmp = gen_portatom6(0, (bpf_int32)port);
- b1 = gen_portatom6(2, (bpf_int32)port);
+ tmp = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2);
+ b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2);
gen_or(tmp, b1);
break;
case Q_AND:
- tmp = gen_portatom6(0, (bpf_int32)port);
- b1 = gen_portatom6(2, (bpf_int32)port);
+ tmp = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2);
+ b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2);
gen_and(tmp, b1);
break;
}
static struct block *
-gen_port6(port, ip_proto, dir)
- int port;
+gen_portrange6(port1, port2, ip_proto, dir)
+ int port1, port2;
int ip_proto;
int dir;
{
struct block *b0, *b1, *tmp;
- /* ether proto ip */
+ /* link proto ip6 */
b0 = gen_linktype(ETHERTYPE_IPV6);
switch (ip_proto) {
case IPPROTO_UDP:
case IPPROTO_TCP:
case IPPROTO_SCTP:
- b1 = gen_portop6(port, ip_proto, dir);
+ b1 = gen_portrangeop6(port1, port2, ip_proto, dir);
break;
case PROTO_UNDEF:
- tmp = gen_portop6(port, IPPROTO_TCP, dir);
- b1 = gen_portop6(port, IPPROTO_UDP, dir);
+ tmp = gen_portrangeop6(port1, port2, IPPROTO_TCP, dir);
+ b1 = gen_portrangeop6(port1, port2, IPPROTO_UDP, dir);
gen_or(tmp, b1);
- tmp = gen_portop6(port, IPPROTO_SCTP, dir);
+ tmp = gen_portrangeop6(port1, port2, IPPROTO_SCTP, dir);
gen_or(tmp, b1);
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);
+ if (v == PROTO_UNDEF) {
+ v = pcap_nametollc(name);
+ if (v == PROTO_UNDEF)
+ bpf_error("unknown ether proto '%s'", name);
+ }
break;
case Q_ISO:
/*NOTREACHED*/
}
+ /*
+ * We don't handle variable-length radiotap here headers yet.
+ * We might want to add BPF instructions to do the protochain
+ * work, to simplify that and, on platforms that have a BPF
+ * interpreter with the new instructions, let the filtering
+ * be done in the kernel. (We already require a modified BPF
+ * engine to do the protochain stuff, to support backward
+ * branches, and backward branch support is unlikely to appear
+ * in kernel BPF engines.)
+ */
+ if (linktype == DLT_IEEE802_11_RADIO)
+ bpf_error("'protochain' not supported with radiotap headers");
+
+ if (linktype == DLT_PPI)
+ bpf_error("'protochain' not supported with PPI headers");
+
no_optimize = 1; /*this code is not compatible with optimzer yet */
/*
- * s[0] is a dummy entry to protect other BPF insn from damaged
+ * s[0] is a dummy entry to protect other BPF insn from damage
* by s[fix] = foo with uninitialized variable "fix". It is somewhat
* hard to find interdependency made by jump table fixup.
*/
/* A = ip->ip_p */
s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
- s[i]->s.k = off_nl + 9;
+ s[i]->s.k = off_ll + 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;
+ s[i]->s.k = off_ll + off_nl;
i++;
break;
#ifdef INET6
/* A = ip6->ip_nxt */
s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
- s[i]->s.k = off_nl + 6;
+ s[i]->s.k = off_ll + off_nl + 6;
i++;
/* X = sizeof(struct ip6_hdr) */
s[i] = new_stmt(BPF_LDX|BPF_IMM);
i++;
/* A = P[X + packet head] */
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
+ s[i]->s.k = off_ll + off_nl;
i++;
/* MEM[reg2] = A */
s[i] = new_stmt(BPF_ST);
i++;
/* A = P[X + packet head]; */
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
+ s[i]->s.k = off_ll + off_nl;
i++;
/* A += 1 */
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
i++;
/* A = P[X + packet head]; */
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
+ s[i]->s.k = off_ll + off_nl;
i++;
/* MEM[reg2] = A */
s[i] = new_stmt(BPF_ST);
i++;
/* A = P[X + packet head] */
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
- s[i]->s.k = off_nl;
+ s[i]->s.k = off_ll + off_nl;
i++;
/* A += 2 */
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
#endif
}
+
+/*
+ * Generate code that checks whether the packet is a packet for protocol
+ * <proto> and whether the type field in that protocol's header has
+ * the value <v>, e.g. if <proto> is Q_IP, it checks whether it's an
+ * IP packet and checks the protocol number in the IP header against <v>.
+ *
+ * If <proto> is Q_DEFAULT, i.e. just "proto" was specified, it checks
+ * against Q_IP and Q_IPV6.
+ */
static struct block *
gen_proto(v, proto, dir)
int v;
*/
b0 = gen_linktype(ETHERTYPE_IP);
#ifndef CHASE_CHAIN
- b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
+ b1 = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)v);
#else
b1 = gen_protochain(v, Q_IP);
#endif
*
* XXX - what about SNAP-encapsulated frames?
*/
- return gen_cmp(2, BPF_H, (0x03<<8) | v);
+ return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | v);
+ /*NOTREACHED*/
break;
case DLT_C_HDLC:
*/
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);
+ b1 = gen_cmp(OR_NET_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);
+ b1 = gen_cmp(OR_NET_NOSNAP, 0, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
}
* 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);
+ b1 = gen_cmp(OR_NET_NOSNAP, 4, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
case Q_IPV6:
b0 = gen_linktype(ETHERTYPE_IPV6);
#ifndef CHASE_CHAIN
- b1 = gen_cmp(off_nl + 6, BPF_B, (bpf_int32)v);
+ b1 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)v);
#else
b1 = gen_protochain(v, Q_IPV6);
#endif
case Q_NETBEUI:
bpf_error("'netbeui proto' is bogus");
+ case Q_RADIO:
+ bpf_error("'radio proto' is bogus");
+
default:
abort();
/* NOTREACHED */
bpf_u_int32 **alist;
#else
int tproto6;
- struct sockaddr_in *sin;
+ struct sockaddr_in *sin4;
struct sockaddr_in6 *sin6;
struct addrinfo *res, *res0;
struct in6_addr mask128;
#endif /*INET6*/
struct block *b, *tmp;
int port, real_proto;
+ int port1, port2;
switch (q.addr) {
addr <<= 8;
mask <<= 8;
}
- return gen_host(addr, mask, proto, dir);
+ return gen_host(addr, mask, proto, dir, q.addr);
case Q_DEFAULT:
case Q_HOST:
return b;
case DLT_IEEE802_11:
+ case DLT_IEEE802_11_RADIO_AVS:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_PRISM_HEADER:
+ case DLT_PPI:
eaddr = pcap_ether_hostton(name);
if (eaddr == NULL)
bpf_error(
* with an LE Control marker. (We've
* already generated a test for LANE.)
*/
- tmp = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H,
- 0xFF00);
+ tmp = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS,
+ BPF_H, 0xFF00);
gen_not(tmp);
eaddr = pcap_ether_hostton(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));
+ return (gen_host(dn_addr, 0, proto, dir, q.addr));
} else {
#ifndef INET6
alist = pcap_nametoaddr(name);
tproto = proto;
if (off_linktype == (u_int)-1 && tproto == Q_DEFAULT)
tproto = Q_IP;
- b = gen_host(**alist++, 0xffffffff, tproto, dir);
+ b = gen_host(**alist++, 0xffffffff, tproto, dir, q.addr);
while (*alist) {
tmp = gen_host(**alist++, 0xffffffff,
- tproto, dir);
+ tproto, dir, q.addr);
gen_or(b, tmp);
b = tmp;
}
if (tproto == Q_IPV6)
continue;
- sin = (struct sockaddr_in *)
+ sin4 = (struct sockaddr_in *)
res->ai_addr;
- tmp = gen_host(ntohl(sin->sin_addr.s_addr),
- 0xffffffff, tproto, dir);
+ tmp = gen_host(ntohl(sin4->sin_addr.s_addr),
+ 0xffffffff, tproto, dir, q.addr);
break;
case AF_INET6:
if (tproto6 == Q_IP)
sin6 = (struct sockaddr_in6 *)
res->ai_addr;
tmp = gen_host6(&sin6->sin6_addr,
- &mask128, tproto6, dir);
+ &mask128, tproto6, dir, q.addr);
break;
default:
continue;
#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_PORTRANGE:
+ if (proto != Q_DEFAULT &&
+ proto != Q_UDP && proto != Q_TCP && proto != Q_SCTP)
+ bpf_error("illegal qualifier of 'portrange'");
+ if (pcap_nametoportrange(name, &port1, &port2, &real_proto) == 0)
+ bpf_error("unknown port in range '%s'", name);
+ if (proto == Q_UDP) {
+ if (real_proto == IPPROTO_TCP)
+ bpf_error("port in range '%s' is tcp", name);
+ else if (real_proto == IPPROTO_SCTP)
+ bpf_error("port in range '%s' is sctp", name);
+ else
+ /* override PROTO_UNDEF */
+ real_proto = IPPROTO_UDP;
+ }
+ if (proto == Q_TCP) {
+ if (real_proto == IPPROTO_UDP)
+ bpf_error("port in range '%s' is udp", name);
+ else if (real_proto == IPPROTO_SCTP)
+ bpf_error("port in range '%s' is sctp", name);
+ else
+ /* override PROTO_UNDEF */
+ real_proto = IPPROTO_TCP;
+ }
+ if (proto == Q_SCTP) {
+ if (real_proto == IPPROTO_UDP)
+ bpf_error("port in range '%s' is udp", name);
+ else if (real_proto == IPPROTO_TCP)
+ bpf_error("port in range '%s' is tcp", name);
+ else
+ /* override PROTO_UNDEF */
+ real_proto = IPPROTO_SCTP;
+ }
+#ifndef INET6
+ return gen_portrange(port1, port2, real_proto, dir);
+#else
+ b = gen_portrange(port1, port2, real_proto, dir);
+ gen_or(gen_portrange6(port1, port2, real_proto, dir), b);
+ return b;
#endif /* INET6 */
case Q_GATEWAY:
/* Convert mask len to mask */
if (masklen > 32)
bpf_error("mask length must be <= 32");
- m = 0xffffffff << (32 - masklen);
+ if (masklen == 0) {
+ /*
+ * X << 32 is not guaranteed by C to be 0; it's
+ * undefined.
+ */
+ m = 0;
+ } else
+ 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);
+ return gen_host(n, m, q.proto, q.dir, q.addr);
default:
bpf_error("Mask syntax for networks only");
/* NOTREACHED */
}
+ /* NOTREACHED */
+ return NULL;
}
struct block *
case Q_HOST:
case Q_NET:
if (proto == Q_DECNET)
- return gen_host(v, 0, proto, dir);
+ return gen_host(v, 0, proto, dir, q.addr);
else if (proto == Q_LINK) {
bpf_error("illegal link layer address");
} else {
v <<= 32 - vlen;
mask <<= 32 - vlen;
}
- return gen_host(v, mask, proto, dir);
+ return gen_host(v, mask, proto, dir, q.addr);
}
case Q_PORT:
}
#endif /* INET6 */
+ case Q_PORTRANGE:
+ 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 'portrange'");
+
+#ifndef INET6
+ return gen_portrange((int)v, (int)v, proto, dir);
+#else
+ {
+ struct block *b;
+ b = gen_portrange((int)v, (int)v, proto, dir);
+ gen_or(gen_portrange6((int)v, (int)v, proto, dir), b);
+ return b;
+ }
+#endif /* INET6 */
+
case Q_GATEWAY:
bpf_error("'gateway' requires a name");
/* NOTREACHED */
/* FALLTHROUGH */
case Q_NET:
- b = gen_host6(addr, &mask, q.proto, q.dir);
+ b = gen_host6(addr, &mask, q.proto, q.dir, q.addr);
freeaddrinfo(res);
return b;
bpf_error("invalid qualifier against IPv6 address");
/* NOTREACHED */
}
+ return NULL;
}
#endif /*INET6*/
struct block *b, *tmp;
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);
-
- /*
- * 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");
+ switch (linktype) {
+ case DLT_EN10MB:
+ return gen_ehostop(eaddr, (int)q.dir);
+ case DLT_FDDI:
+ return gen_fhostop(eaddr, (int)q.dir);
+ case DLT_IEEE802:
+ return gen_thostop(eaddr, (int)q.dir);
+ case DLT_IEEE802_11:
+ case DLT_IEEE802_11_RADIO_AVS:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_PRISM_HEADER:
+ case DLT_PPI:
+ return gen_wlanhostop(eaddr, (int)q.dir);
+ case DLT_SUNATM:
+ if (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(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
+ gen_not(tmp);
+
+ /*
+ * Now check the MAC address.
+ */
+ b = gen_ehostop(eaddr, (int)q.dir);
+ gen_and(tmp, b);
+ return b;
+ }
+ break;
+ case DLT_IP_OVER_FC:
+ return gen_ipfchostop(eaddr, (int)q.dir);
+ default:
+ bpf_error("ethernet addresses supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel");
+ break;
+ }
}
bpf_error("ethernet address used in non-ether expression");
/* NOTREACHED */
+ return NULL;
}
void
return s;
}
+/*
+ * Modify "index" to use the value stored into its register as an
+ * offset relative to the beginning of the header for the protocol
+ * "proto", and allocate a register and put an item "size" bytes long
+ * (1, 2, or 4) at that offset into that register, making it the register
+ * for "index".
+ */
struct arth *
-gen_load(proto, index, size)
+gen_load(proto, inst, size)
int proto;
- struct arth *index;
+ struct arth *inst;
int size;
{
struct slist *s, *tmp;
struct block *b;
int regno = alloc_reg();
- free_reg(index->regno);
+ free_reg(inst->regno);
switch (size) {
default:
default:
bpf_error("unsupported index operation");
+ case Q_RADIO:
+ /*
+ * The offset is relative to the beginning of the packet
+ * data, if we have a radio header. (If we don't, this
+ * is an error.)
+ */
+ if (linktype != DLT_IEEE802_11_RADIO_AVS &&
+ linktype != DLT_IEEE802_11_RADIO &&
+ linktype != DLT_PRISM_HEADER)
+ bpf_error("radio information not present in capture");
+
+ /*
+ * Load into the X register the offset computed into the
+ * register specifed by "index".
+ */
+ s = xfer_to_x(inst);
+
+ /*
+ * Load the item at that offset.
+ */
+ tmp = new_stmt(BPF_LD|BPF_IND|size);
+ sappend(s, tmp);
+ sappend(inst->s, s);
+ break;
+
case Q_LINK:
/*
+ * The offset is relative to the beginning of
+ * the link-layer header.
+ *
* 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
* frame, so that 0 refers, for Ethernet LANE, to
* the beginning of the destination address?
*/
- s = xfer_to_x(index);
+ s = gen_llprefixlen();
+
+ /*
+ * If "s" is non-null, it has code to arrange that the
+ * X register contains the length of the prefix preceding
+ * the link-layer header. Add to it the offset computed
+ * into the register specified by "index", and move that
+ * into the X register. Otherwise, just load into the X
+ * register the offset computed into the register specifed
+ * by "index".
+ */
+ if (s != NULL) {
+ sappend(s, xfer_to_a(inst));
+ sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
+ sappend(s, new_stmt(BPF_MISC|BPF_TAX));
+ } else
+ s = xfer_to_x(inst);
+
+ /*
+ * Load the item at the sum of the offset we've put in the
+ * X register and the offset of the start of the link
+ * layer header (which is 0 if the radio header is
+ * variable-length; that header length is what we put
+ * into the X register and then added to the index).
+ */
tmp = new_stmt(BPF_LD|BPF_IND|size);
+ tmp->s.k = off_ll;
sappend(s, tmp);
- sappend(index->s, s);
+ sappend(inst->s, s);
break;
case Q_IP:
#ifdef INET6
case Q_IPV6:
#endif
- /* XXX Note that we assume a fixed link header here. */
- s = xfer_to_x(index);
+ /*
+ * The offset is relative to the beginning of
+ * the network-layer header.
+ * XXX - are there any cases where we want
+ * off_nl_nosnap?
+ */
+ s = gen_llprefixlen();
+
+ /*
+ * If "s" is non-null, it has code to arrange that the
+ * X register contains the length of the prefix preceding
+ * the link-layer header. Add to it the offset computed
+ * into the register specified by "index", and move that
+ * into the X register. Otherwise, just load into the X
+ * register the offset computed into the register specifed
+ * by "index".
+ */
+ if (s != NULL) {
+ sappend(s, xfer_to_a(inst));
+ sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
+ sappend(s, new_stmt(BPF_MISC|BPF_TAX));
+ } else
+ s = xfer_to_x(inst);
+
+ /*
+ * Load the item at the sum of the offset we've put in the
+ * X register, the offset of the start of the network
+ * layer header, and the offset of the start of the link
+ * layer header (which is 0 if the radio header is
+ * variable-length; that header length is what we put
+ * into the X register and then added to the index).
+ */
tmp = new_stmt(BPF_LD|BPF_IND|size);
- tmp->s.k = off_nl;
+ tmp->s.k = off_ll + off_nl;
sappend(s, tmp);
- sappend(index->s, s);
+ sappend(inst->s, s);
+ /*
+ * Do the computation only if the packet contains
+ * the protocol in question.
+ */
b = gen_proto_abbrev(proto);
- if (index->b)
- gen_and(index->b, b);
- index->b = b;
+ if (inst->b)
+ gen_and(inst->b, b);
+ inst->b = b;
break;
case Q_SCTP:
case Q_IGRP:
case Q_PIM:
case Q_VRRP:
- s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
- s->s.k = off_nl;
- sappend(s, xfer_to_a(index));
+ /*
+ * The offset is relative to the beginning of
+ * the transport-layer header.
+ *
+ * Load the X register with the length of the IPv4 header
+ * (plus the offset of the link-layer header, if it's
+ * a variable-length header), in bytes.
+ *
+ * XXX - are there any cases where we want
+ * off_nl_nosnap?
+ * XXX - we should, if we're built with
+ * IPv6 support, generate code to load either
+ * IPv4, IPv6, or both, as appropriate.
+ */
+ s = gen_loadx_iphdrlen();
+
+ /*
+ * The X register now contains the sum of the length
+ * of any variable-length header preceding the link-layer
+ * header and the length of the network-layer header.
+ * Load into the A register the offset relative to
+ * the beginning of the transport layer header,
+ * add the X register to that, move that to the
+ * X register, and load with an offset from the
+ * X register equal to the offset of the network
+ * layer header relative to the beginning of
+ * the link-layer header plus the length of any
+ * fixed-length header preceding the link-layer
+ * header.
+ */
+ sappend(s, xfer_to_a(inst));
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);
+ tmp->s.k = off_ll + off_nl;
+ sappend(inst->s, s);
+ /*
+ * Do the computation only if the packet contains
+ * the protocol in question - which is true only
+ * if this is an IP datagram and is the first or
+ * only fragment of that datagram.
+ */
gen_and(gen_proto_abbrev(proto), b = gen_ipfrag());
- if (index->b)
- gen_and(index->b, b);
+ if (inst->b)
+ gen_and(inst->b, b);
#ifdef INET6
gen_and(gen_proto_abbrev(Q_IP), b);
#endif
- index->b = b;
+ inst->b = b;
break;
#ifdef INET6
case Q_ICMPV6:
/*NOTREACHED*/
#endif
}
- index->regno = regno;
+ inst->regno = regno;
s = new_stmt(BPF_ST);
s->s.k = regno;
- sappend(index->s, s);
+ sappend(inst->s, s);
- return index;
+ return inst;
}
struct block *
static int regused[BPF_MEMWORDS];
static int curreg;
+/*
+ * Initialize the table of used registers and the current register.
+ */
+static void
+init_regs()
+{
+ curreg = 0;
+ memset(regused, 0, sizeof regused);
+}
+
/*
* Return the next free register.
*/
}
bpf_error("too many registers needed to evaluate expression");
/* NOTREACHED */
+ return 0;
}
/*
return b;
}
+/*
+ * This is for "byte {idx} {op} {val}"; "idx" is treated as relative to
+ * the beginning of the link-layer header.
+ * XXX - that means you can't test values in the radiotap header, but
+ * as that header is difficult if not impossible to parse generally
+ * without a loop, that might not be a severe problem. A new keyword
+ * "radio" could be added for that, although what you'd really want
+ * would be a way of testing particular radio header values, which
+ * would generate code appropriate to the radio header in question.
+ */
struct block *
gen_byteop(op, idx, val)
int op, idx, val;
abort();
case '=':
- return gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
+ return gen_cmp(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val);
case '<':
- b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
- b->s.code = JMP(BPF_JGE);
- gen_not(b);
+ b = gen_cmp_lt(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val);
return b;
case '>':
- b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val);
- b->s.code = JMP(BPF_JGT);
+ b = gen_cmp_gt(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val);
return b;
case '|':
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(ebroadcast, Q_DST);
- if (linktype == DLT_FDDI)
- 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) {
+ switch (linktype) {
+ case DLT_ARCNET:
+ case DLT_ARCNET_LINUX:
+ return gen_ahostop(abroadcast, Q_DST);
+ case DLT_EN10MB:
+ return gen_ehostop(ebroadcast, Q_DST);
+ case DLT_FDDI:
+ return gen_fhostop(ebroadcast, Q_DST);
+ case DLT_IEEE802:
+ return gen_thostop(ebroadcast, Q_DST);
+ case DLT_IEEE802_11:
+ case DLT_IEEE802_11_RADIO_AVS:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_PPI:
+ case DLT_PRISM_HEADER:
+ return gen_wlanhostop(ebroadcast, Q_DST);
+ case DLT_IP_OVER_FC:
+ return gen_ipfchostop(ebroadcast, Q_DST);
+ case DLT_SUNATM:
+ if (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);
+ b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
gen_not(b1);
/*
b0 = gen_ehostop(ebroadcast, Q_DST);
gen_and(b1, b0);
return b0;
- }
- bpf_error("not a broadcast link");
+ }
+ break;
+ default:
+ 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,
+ b1 = gen_mcmp(OR_NET, 16, BPF_W, (bpf_int32)0, hostmask);
+ b2 = gen_mcmp(OR_NET, 16, BPF_W,
(bpf_int32)(~0 & hostmask), hostmask);
gen_or(b1, b2);
gen_and(b0, b2);
return b2;
}
bpf_error("only link-layer/IP broadcast filters supported");
+ /* NOTREACHED */
+ return NULL;
}
/*
register struct slist *s;
/* link[offset] & 1 != 0 */
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = offset;
+ s = gen_load_a(OR_LINK, offset, BPF_B);
b0 = new_block(JMP(BPF_JSET));
b0->s.k = 1;
b0->stmts = 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);
-
- if (linktype == DLT_EN10MB) {
- /* ether[0] & 1 != 0 */
- return gen_mac_multicast(0);
- }
-
- 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);
-
- /*
- * For management frames, the DA is at 4.
- */
- b1 = gen_mac_multicast(4);
- 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;
- }
-
- if (linktype == DLT_IP_OVER_FC) {
- b0 = gen_mac_multicast(2);
- return b0;
- }
-
- if (linktype == DLT_SUNATM && is_lane) {
+ switch (linktype) {
+ case DLT_ARCNET:
+ case DLT_ARCNET_LINUX:
+ /* all ARCnet multicasts use the same address */
+ return gen_ahostop(abroadcast, Q_DST);
+ case DLT_EN10MB:
+ /* ether[0] & 1 != 0 */
+ return gen_mac_multicast(0);
+ case 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);
+ case DLT_IEEE802:
+ /* tr[2] & 1 != 0 */
+ return gen_mac_multicast(2);
+ case DLT_IEEE802_11:
+ case DLT_IEEE802_11_RADIO_AVS:
+ case DLT_PPI:
+ case DLT_IEEE802_11_RADIO:
+ case DLT_PRISM_HEADER:
+ /*
+ * 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 = gen_load_a(OR_LINK, 1, BPF_B);
+ 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 = gen_load_a(OR_LINK, 1, BPF_B);
+ 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 = gen_load_a(OR_LINK, 0, BPF_B);
+ 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 = gen_load_a(OR_LINK, 0, BPF_B);
+ 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_mac_multicast(4);
+ 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 = gen_load_a(OR_LINK, 0, BPF_B);
+ 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 DLT_IP_OVER_FC:
+ b0 = gen_mac_multicast(2);
+ return b0;
+ case DLT_SUNATM:
+ if (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);
+ b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
gen_not(b1);
/* ether[off_mac] & 1 != 0 */
b0 = gen_mac_multicast(off_mac);
gen_and(b1, b0);
return b0;
- }
-
- /* Link not known to support multicasts */
- break;
+ }
+ break;
+ default:
+ break;
+ }
+ /* Link not known to support multicasts */
+ 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);
+ b1 = gen_cmp_ge(OR_NET, 16, BPF_B, (bpf_int32)224);
gen_and(b0, b1);
return b1;
#ifdef INET6
case Q_IPV6:
b0 = gen_linktype(ETHERTYPE_IPV6);
- b1 = gen_cmp(off_nl + 24, BPF_B, (bpf_int32)255);
+ b1 = gen_cmp(OR_NET, 24, BPF_B, (bpf_int32)255);
gen_and(b0, b1);
return b1;
#endif /* INET6 */
}
bpf_error("link-layer multicast filters supported only on ethernet/FDDI/token ring/ARCNET/802.11/ATM LANE/Fibre Channel");
+ /* NOTREACHED */
+ return NULL;
}
/*
/*
* Match packets sent by this machine.
*/
- b0 = gen_cmp(0, BPF_H, LINUX_SLL_OUTGOING);
+ b0 = gen_cmp(OR_LINK, 0, BPF_H, LINUX_SLL_OUTGOING);
} else {
/*
* Match packets sent to this machine.
* shouldn't be matched, but what about broadcast
* or multicast packets we received?
*/
- b0 = gen_cmp(0, BPF_H, LINUX_SLL_HOST);
+ b0 = gen_cmp(OR_LINK, 0, BPF_H, LINUX_SLL_HOST);
}
break;
+#ifdef HAVE_NET_PFVAR_H
case DLT_PFLOG:
- b0 = gen_cmp(26, BPF_H,
+ b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, dir), BPF_B,
(bpf_int32)((dir == 0) ? PF_IN : PF_OUT));
break;
+#endif
+
+ case DLT_PPP_PPPD:
+ if (dir) {
+ /* match outgoing packets */
+ b0 = gen_cmp(OR_LINK, 0, BPF_B, PPP_PPPD_OUT);
+ } else {
+ /* match incoming packets */
+ b0 = gen_cmp(OR_LINK, 0, BPF_B, PPP_PPPD_IN);
+ }
+ break;
+
+ case DLT_JUNIPER_MFR:
+ case DLT_JUNIPER_MLFR:
+ case DLT_JUNIPER_MLPPP:
+ case DLT_JUNIPER_ATM1:
+ case DLT_JUNIPER_ATM2:
+ case DLT_JUNIPER_PPPOE:
+ case DLT_JUNIPER_PPPOE_ATM:
+ case DLT_JUNIPER_GGSN:
+ case DLT_JUNIPER_ES:
+ case DLT_JUNIPER_MONITOR:
+ case DLT_JUNIPER_SERVICES:
+ case DLT_JUNIPER_ETHER:
+ case DLT_JUNIPER_PPP:
+ case DLT_JUNIPER_FRELAY:
+ case DLT_JUNIPER_CHDLC:
+ case DLT_JUNIPER_VP:
+ /* juniper flags (including direction) are stored
+ * the byte after the 3-byte magic number */
+ if (dir) {
+ /* match outgoing packets */
+ b0 = gen_mcmp(OR_LINK, 3, BPF_B, 0, 0x01);
+ } else {
+ /* match incoming packets */
+ b0 = gen_mcmp(OR_LINK, 3, BPF_B, 1, 0x01);
+ }
+ break;
default:
bpf_error("inbound/outbound not supported on linktype %d",
return (b0);
}
+#ifdef HAVE_NET_PFVAR_H
/* PF firewall log matched interface */
struct block *
gen_pf_ifname(const char *ifname)
{
- if (linktype != DLT_PFLOG) {
- bpf_error("ifname supported only for DLT_PFLOG");
+ struct block *b0;
+ u_int len, off;
+
+ if (linktype == DLT_PFLOG) {
+ len = sizeof(((struct pfloghdr *)0)->ifname);
+ off = offsetof(struct pfloghdr, ifname);
+ } else {
+ bpf_error("ifname not supported on linktype 0x%x", linktype);
/* NOTREACHED */
}
- if (strlen(ifname) >= 16) {
- bpf_error("ifname interface names can't be larger than 16 characters");
+ if (strlen(ifname) >= len) {
+ bpf_error("ifname interface names can only be %d characters",
+ len-1);
/* NOTREACHED */
}
- return (gen_bcmp(4, strlen(ifname), (const u_char *)ifname));
+ b0 = gen_bcmp(OR_LINK, off, strlen(ifname), (const u_char *)ifname);
+ return (b0);
}
+/* PF firewall log ruleset name */
+struct block *
+gen_pf_ruleset(char *ruleset)
+{
+ struct block *b0;
+
+ if (linktype != DLT_PFLOG) {
+ bpf_error("ruleset not supported on linktype 0x%x", linktype);
+ /* NOTREACHED */
+ }
+ if (strlen(ruleset) >= sizeof(((struct pfloghdr *)0)->ruleset)) {
+ bpf_error("ruleset names can only be %ld characters",
+ (long)(sizeof(((struct pfloghdr *)0)->ruleset) - 1));
+ /* NOTREACHED */
+ }
+ b0 = gen_bcmp(OR_LINK, offsetof(struct pfloghdr, ruleset),
+ strlen(ruleset), (const u_char *)ruleset);
+ return (b0);
+}
/* PF firewall log rule number */
struct block *
gen_pf_rnr(int rnr)
{
+ struct block *b0;
+
+ if (linktype == DLT_PFLOG) {
+ b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, rulenr), BPF_W,
+ (bpf_int32)rnr);
+ } else {
+ bpf_error("rnr not supported on linktype 0x%x", linktype);
+ /* NOTREACHED */
+ }
+
+ return (b0);
+}
+
+/* PF firewall log sub-rule number */
+struct block *
+gen_pf_srnr(int srnr)
+{
+ struct block *b0;
+
if (linktype != DLT_PFLOG) {
- bpf_error("rnr supported only for DLT_PFLOG");
+ bpf_error("srnr not supported on linktype 0x%x", linktype);
/* NOTREACHED */
}
- return (gen_cmp(20, BPF_H, (bpf_int32)rnr));
+ b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, subrulenr), BPF_W,
+ (bpf_int32)srnr);
+ return (b0);
}
/* PF firewall log reason code */
struct block *
gen_pf_reason(int reason)
{
- if (linktype != DLT_PFLOG) {
- bpf_error("reason supported only for DLT_PFLOG");
+ struct block *b0;
+
+ if (linktype == DLT_PFLOG) {
+ b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, reason), BPF_B,
+ (bpf_int32)reason);
+ } else {
+ bpf_error("reason not supported on linktype 0x%x", linktype);
/* NOTREACHED */
}
- return (gen_cmp(22, BPF_H, (bpf_int32)reason));
+ return (b0);
}
/* PF firewall log action */
struct block *
gen_pf_action(int action)
{
- if (linktype != DLT_PFLOG) {
- bpf_error("action supported only for DLT_PFLOG");
+ struct block *b0;
+
+ if (linktype == DLT_PFLOG) {
+ b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, action), BPF_B,
+ (bpf_int32)action);
+ } else {
+ bpf_error("action not supported on linktype 0x%x", linktype);
/* NOTREACHED */
}
- return (gen_cmp(24, BPF_H, (bpf_int32)action));
+ return (b0);
+}
+#else /* !HAVE_NET_PFVAR_H */
+struct block *
+gen_pf_ifname(const char *ifname)
+{
+ bpf_error("libpcap was compiled without pf support");
+ /* NOTREACHED */
+ return (NULL);
+}
+
+struct block *
+gen_pf_ruleset(char *ruleset)
+{
+ bpf_error("libpcap was compiled on a machine without pf support");
+ /* NOTREACHED */
+ return (NULL);
+}
+
+struct block *
+gen_pf_rnr(int rnr)
+{
+ bpf_error("libpcap was compiled on a machine without pf support");
+ /* NOTREACHED */
+ return (NULL);
+}
+
+struct block *
+gen_pf_srnr(int srnr)
+{
+ bpf_error("libpcap was compiled on a machine without pf support");
+ /* NOTREACHED */
+ return (NULL);
+}
+
+struct block *
+gen_pf_reason(int reason)
+{
+ bpf_error("libpcap was compiled on a machine without pf support");
+ /* NOTREACHED */
+ return (NULL);
+}
+
+struct block *
+gen_pf_action(int action)
+{
+ bpf_error("libpcap was compiled on a machine without pf support");
+ /* NOTREACHED */
+ return (NULL);
}
+#endif /* HAVE_NET_PFVAR_H */
struct block *
gen_acode(eaddr, q)
}
bpf_error("ARCnet address used in non-arc expression");
/* NOTREACHED */
+ return NULL;
}
static struct block *
switch (dir) {
/* src comes first, different from Ethernet */
case Q_SRC:
- return gen_bcmp(0, 1, eaddr);
+ return gen_bcmp(OR_LINK, 0, 1, eaddr);
case Q_DST:
- return gen_bcmp(1, 1, eaddr);
+ return gen_bcmp(OR_LINK, 1, 1, eaddr);
case Q_AND:
b0 = gen_ahostop(eaddr, Q_SRC);
gen_vlan(vlan_num)
int vlan_num;
{
- struct block *b0;
+ struct block *b0, *b1;
+
+ /* can't check for VLAN-encapsulated packets inside MPLS */
+ if (label_stack_depth > 0)
+ bpf_error("no VLAN match after MPLS");
/*
* Change the offsets to point to the type and data fields within
- * the VLAN packet. This is somewhat of a kludge.
+ * the VLAN packet. Just increment the offsets, so that we
+ * can support a hierarchy, e.g. "vlan 300 && vlan 200" to
+ * capture VLAN 200 encapsulated within VLAN 100.
+ *
+ * XXX - this is a bit of a kludge. If we were to split the
+ * compiler into a parser that parses an expression and
+ * generates an expression tree, and a code generator that
+ * takes an expression tree (which could come from our
+ * parser or from some other parser) and generates BPF code,
+ * we could perhaps make the offsets parameters of routines
+ * and, in the handler for an "AND" node, pass to subnodes
+ * other than the VLAN node the adjusted offsets.
+ *
+ * This would mean that "vlan" would, instead of changing the
+ * behavior of *all* tests after it, change only the behavior
+ * of tests ANDed with it. That would change the documented
+ * semantics of "vlan", which might break some expressions.
+ * However, it would mean that "(vlan and ip) or ip" would check
+ * both for VLAN-encapsulated IP and IP-over-Ethernet, rather than
+ * checking only for VLAN-encapsulated IP, so that could still
+ * be considered worth doing; it wouldn't break expressions
+ * that are of the form "vlan and ..." or "vlan N and ...",
+ * which I suspect are the most common expressions involving
+ * "vlan". "vlan or ..." doesn't necessarily do what the user
+ * would really want, now, as all the "or ..." tests would
+ * be done assuming a VLAN, even though the "or" could be viewed
+ * as meaning "or, if this isn't a VLAN packet...".
*/
- if (orig_nl == (u_int)-1) {
- orig_linktype = off_linktype; /* save original values */
- orig_nl = off_nl;
- orig_nl_nosnap = off_nl_nosnap;
+ orig_linktype = off_linktype; /* save original values */
+ orig_nl = off_nl;
- switch (linktype) {
+ switch (linktype) {
- case DLT_EN10MB:
- off_linktype = 16;
- off_nl_nosnap = 18;
- off_nl = 18;
- break;
+ case DLT_EN10MB:
+ off_linktype += 4;
+ off_nl_nosnap += 4;
+ off_nl += 4;
+ break;
- default:
- bpf_error("no VLAN support for data link type %d",
- linktype);
- /*NOTREACHED*/
- }
+ default:
+ bpf_error("no VLAN support for data link type %d",
+ linktype);
+ /*NOTREACHED*/
}
/* check for VLAN */
- b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_8021Q);
+ b0 = gen_cmp(OR_LINK, orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_8021Q);
/* If a specific VLAN is requested, check VLAN id */
if (vlan_num >= 0) {
- struct block *b1;
+ b1 = gen_mcmp(OR_LINK, orig_nl, BPF_H, (bpf_int32)vlan_num,
+ 0x0fff);
+ gen_and(b0, b1);
+ b0 = b1;
+ }
+
+ return (b0);
+}
- b1 = gen_cmp(orig_nl, BPF_H, (bpf_int32)vlan_num);
+/*
+ * support for MPLS
+ */
+struct block *
+gen_mpls(label_num)
+ int label_num;
+{
+ struct block *b0,*b1;
+
+ /*
+ * Change the offsets to point to the type and data fields within
+ * the MPLS packet. Just increment the offsets, so that we
+ * can support a hierarchy, e.g. "mpls 100000 && mpls 1024" to
+ * capture packets with an outer label of 100000 and an inner
+ * label of 1024.
+ *
+ * XXX - this is a bit of a kludge. See comments in gen_vlan().
+ */
+ orig_nl = off_nl;
+
+ if (label_stack_depth > 0) {
+ /* just match the bottom-of-stack bit clear */
+ b0 = gen_mcmp(OR_LINK, orig_nl-2, BPF_B, 0, 0x01);
+ } else {
+ /*
+ * Indicate that we're checking MPLS-encapsulated headers,
+ * to make sure higher level code generators don't try to
+ * match against IP-related protocols such as Q_ARP, Q_RARP
+ * etc.
+ */
+ switch (linktype) {
+
+ case DLT_C_HDLC: /* fall through */
+ case DLT_EN10MB:
+ b0 = gen_linktype(ETHERTYPE_MPLS);
+ break;
+
+ case DLT_PPP:
+ b0 = gen_linktype(PPP_MPLS_UCAST);
+ break;
+
+ /* FIXME add other DLT_s ...
+ * for Frame-Relay/and ATM this may get messy due to SNAP headers
+ * leave it for now */
+
+ default:
+ bpf_error("no MPLS support for data link type %d",
+ linktype);
+ b0 = NULL;
+ /*NOTREACHED*/
+ break;
+ }
+ }
+
+ /* If a specific MPLS label is requested, check it */
+ if (label_num >= 0) {
+ label_num = label_num << 12; /* label is shifted 12 bits on the wire */
+ b1 = gen_mcmp(OR_LINK, orig_nl, BPF_W, (bpf_int32)label_num,
+ 0xfffff000); /* only compare the first 20 bits */
gen_and(b0, b1);
b0 = b1;
}
+ off_nl_nosnap += 4;
+ off_nl += 4;
+ label_stack_depth++;
return (b0);
}
+/*
+ * Support PPPOE discovery and session.
+ */
+struct block *
+gen_pppoed()
+{
+ /* check for PPPoE discovery */
+ return gen_linktype((bpf_int32)ETHERTYPE_PPPOED);
+}
+
+struct block *
+gen_pppoes()
+{
+ struct block *b0;
+
+ /*
+ * Test against the PPPoE session link-layer type.
+ */
+ b0 = gen_linktype((bpf_int32)ETHERTYPE_PPPOES);
+
+ /*
+ * Change the offsets to point to the type and data fields within
+ * the PPP packet.
+ *
+ * XXX - this is a bit of a kludge. If we were to split the
+ * compiler into a parser that parses an expression and
+ * generates an expression tree, and a code generator that
+ * takes an expression tree (which could come from our
+ * parser or from some other parser) and generates BPF code,
+ * we could perhaps make the offsets parameters of routines
+ * and, in the handler for an "AND" node, pass to subnodes
+ * other than the PPPoE node the adjusted offsets.
+ *
+ * This would mean that "pppoes" would, instead of changing the
+ * behavior of *all* tests after it, change only the behavior
+ * of tests ANDed with it. That would change the documented
+ * semantics of "pppoes", which might break some expressions.
+ * However, it would mean that "(pppoes and ip) or ip" would check
+ * both for VLAN-encapsulated IP and IP-over-Ethernet, rather than
+ * checking only for VLAN-encapsulated IP, so that could still
+ * be considered worth doing; it wouldn't break expressions
+ * that are of the form "pppoes and ..." which I suspect are the
+ * most common expressions involving "pppoes". "pppoes or ..."
+ * doesn't necessarily do what the user would really want, now,
+ * as all the "or ..." tests would be done assuming PPPoE, even
+ * though the "or" could be viewed as meaning "or, if this isn't
+ * a PPPoE packet...".
+ */
+ orig_linktype = off_linktype; /* save original values */
+ orig_nl = off_nl;
+
+ /*
+ * The "network-layer" protocol is PPPoE, which has a 6-byte
+ * PPPoE header, followed by PPP payload, so we set the
+ * offsets to the network layer offset plus 6 bytes for
+ * the PPPoE header plus the values appropriate for PPP when
+ * encapsulated in Ethernet (which means there's no HDLC
+ * encapsulation).
+ */
+ off_linktype = orig_nl + 6;
+ off_nl = orig_nl + 6 + 2;
+ off_nl_nosnap = orig_nl + 6 + 2;
+
+ /*
+ * Set the link-layer type to PPP, as all subsequent tests will
+ * be on the encapsulated PPP header.
+ */
+ linktype = DLT_PPP;
+
+ return b0;
+}
+
struct block *
gen_atmfield_code(atmfield, jvalue, jtype, reverse)
int atmfield;
- bpf_u_int32 jvalue;
+ bpf_int32 jvalue;
bpf_u_int32 jtype;
int reverse;
{
bpf_error("'vpi' supported only on raw ATM");
if (off_vpi == (u_int)-1)
abort();
- b0 = gen_ncmp(BPF_B, off_vpi, 0xffffffff, (u_int)jtype,
- (u_int)jvalue, reverse);
+ b0 = gen_ncmp(OR_LINK, off_vpi, BPF_B, 0xffffffff, jtype,
+ reverse, jvalue);
break;
case A_VCI:
bpf_error("'vci' supported only on raw ATM");
if (off_vci == (u_int)-1)
abort();
- b0 = gen_ncmp(BPF_H, off_vci, 0xffffffff, (u_int)jtype,
- (u_int)jvalue, reverse);
+ b0 = gen_ncmp(OR_LINK, off_vci, BPF_H, 0xffffffff, jtype,
+ reverse, jvalue);
break;
case A_PROTOTYPE:
if (off_proto == (u_int)-1)
abort(); /* XXX - this isn't on FreeBSD */
- b0 = gen_ncmp(BPF_B, off_proto, 0x0f, (u_int)jtype,
- (u_int)jvalue, reverse);
+ b0 = gen_ncmp(OR_LINK, off_proto, BPF_B, 0x0f, jtype,
+ reverse, jvalue);
break;
case A_MSGTYPE:
if (off_payload == (u_int)-1)
abort();
- b0 = gen_ncmp(BPF_B, off_payload + MSG_TYPE_POS, 0xffffffff,
- (u_int)jtype, (u_int)jvalue, reverse);
+ b0 = gen_ncmp(OR_LINK, off_payload + MSG_TYPE_POS, BPF_B,
+ 0xffffffff, jtype, reverse, jvalue);
break;
case A_CALLREFTYPE:
bpf_error("'callref' supported only on raw ATM");
if (off_proto == (u_int)-1)
abort();
- b0 = gen_ncmp(BPF_B, off_proto, 0xffffffff, (u_int)jtype,
- (u_int)jvalue, reverse);
+ b0 = gen_ncmp(OR_LINK, off_proto, BPF_B, 0xffffffff,
+ jtype, reverse, jvalue);
break;
default:
return b1;
}
+/*
+ * Filtering for MTP2 messages based on li value
+ * FISU, length is null
+ * LSSU, length is 1 or 2
+ * MSU, length is 3 or more
+ */
+struct block *
+gen_mtp2type_abbrev(type)
+ int type;
+{
+ struct block *b0, *b1;
+
+ switch (type) {
+
+ case M_FISU:
+ if ( (linktype != DLT_MTP2) &&
+ (linktype != DLT_MTP2_WITH_PHDR) )
+ bpf_error("'fisu' supported only on MTP2");
+ /* gen_ncmp(offrel, offset, size, mask, jtype, reverse, value) */
+ b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JEQ, 0, 0);
+ break;
+
+ case M_LSSU:
+ if ( (linktype != DLT_MTP2) &&
+ (linktype != DLT_MTP2_WITH_PHDR) )
+ bpf_error("'lssu' supported only on MTP2");
+ b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 1, 2);
+ b1 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 0, 0);
+ gen_and(b1, b0);
+ break;
+
+ case M_MSU:
+ if ( (linktype != DLT_MTP2) &&
+ (linktype != DLT_MTP2_WITH_PHDR) )
+ bpf_error("'msu' supported only on MTP2");
+ b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 0, 2);
+ break;
+
+ default:
+ abort();
+ }
+ return b0;
+}
+
+struct block *
+gen_mtp3field_code(mtp3field, jvalue, jtype, reverse)
+ int mtp3field;
+ bpf_u_int32 jvalue;
+ bpf_u_int32 jtype;
+ int reverse;
+{
+ struct block *b0;
+ bpf_u_int32 val1 , val2 , val3;
+
+ switch (mtp3field) {
+
+ case M_SIO:
+ if (off_sio == (u_int)-1)
+ bpf_error("'sio' supported only on SS7");
+ /* sio coded on 1 byte so max value 255 */
+ if(jvalue > 255)
+ bpf_error("sio value %u too big; max value = 255",
+ jvalue);
+ b0 = gen_ncmp(OR_PACKET, off_sio, BPF_B, 0xffffffff,
+ (u_int)jtype, reverse, (u_int)jvalue);
+ break;
+
+ case M_OPC:
+ if (off_opc == (u_int)-1)
+ bpf_error("'opc' supported only on SS7");
+ /* opc coded on 14 bits so max value 16383 */
+ if (jvalue > 16383)
+ bpf_error("opc value %u too big; max value = 16383",
+ jvalue);
+ /* the following instructions are made to convert jvalue
+ * to the form used to write opc in an ss7 message*/
+ val1 = jvalue & 0x00003c00;
+ val1 = val1 >>10;
+ val2 = jvalue & 0x000003fc;
+ val2 = val2 <<6;
+ val3 = jvalue & 0x00000003;
+ val3 = val3 <<22;
+ jvalue = val1 + val2 + val3;
+ b0 = gen_ncmp(OR_PACKET, off_opc, BPF_W, 0x00c0ff0f,
+ (u_int)jtype, reverse, (u_int)jvalue);
+ break;
+
+ case M_DPC:
+ if (off_dpc == (u_int)-1)
+ bpf_error("'dpc' supported only on SS7");
+ /* dpc coded on 14 bits so max value 16383 */
+ if (jvalue > 16383)
+ bpf_error("dpc value %u too big; max value = 16383",
+ jvalue);
+ /* the following instructions are made to convert jvalue
+ * to the forme used to write dpc in an ss7 message*/
+ val1 = jvalue & 0x000000ff;
+ val1 = val1 << 24;
+ val2 = jvalue & 0x00003f00;
+ val2 = val2 << 8;
+ jvalue = val1 + val2;
+ b0 = gen_ncmp(OR_PACKET, off_dpc, BPF_W, 0xff3f0000,
+ (u_int)jtype, reverse, (u_int)jvalue);
+ break;
+
+ case M_SLS:
+ if (off_sls == (u_int)-1)
+ bpf_error("'sls' supported only on SS7");
+ /* sls coded on 4 bits so max value 15 */
+ if (jvalue > 15)
+ bpf_error("sls value %u too big; max value = 15",
+ jvalue);
+ /* the following instruction is made to convert jvalue
+ * to the forme used to write sls in an ss7 message*/
+ jvalue = jvalue << 4;
+ b0 = gen_ncmp(OR_PACKET, off_sls, BPF_B, 0xf0,
+ (u_int)jtype,reverse, (u_int)jvalue);
+ break;
+
+ default:
+ abort();
+ }
+ return b0;
+}
static struct block *
gen_msg_abbrev(type)
break;
case A_CALLPROCEED:
- b1 = gen_atmfield_code(A_MSGTYPE, CALL_PROCEED, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_MSGTYPE, CALL_PROCEED, BPF_JEQ, 0);
break;
case A_CONNECT:
b1 = gen_atmfield_code(A_MSGTYPE, CONNECT, BPF_JEQ, 0);
- break;
+ break;
case A_CONNECTACK:
- b1 = gen_atmfield_code(A_MSGTYPE, CONNECT_ACK, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_MSGTYPE, CONNECT_ACK, BPF_JEQ, 0);
break;
case A_RELEASE:
break;
case A_RELEASE_DONE:
- b1 = gen_atmfield_code(A_MSGTYPE, RELEASE_DONE, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_MSGTYPE, RELEASE_DONE, BPF_JEQ, 0);
break;
default:
if (!is_atm)
bpf_error("'oamf4' supported only on raw ATM");
/* OAM F4 type */
- b0 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0);
+ b0 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0);
b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0);
- gen_or(b0, b1);
+ gen_or(b0, b1);
b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
gen_and(b0, b1);
break;
projects / libpcap / blobdiff