*/
#ifndef lint
static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.158 2001-09-20 00:24:24 fenner Exp $ (LBL)";
+ "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.191 2003-05-02 08:37:43 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
+#ifdef WIN32
+#include <pcap-stdinc.h>
+#else /* WIN32 */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>
+#endif /* WIN32 */
+
+/*
+ * XXX - why was this included even on UNIX?
+ */
+#ifdef __MINGW32__
+#include "IP6_misc.h"
+#endif
+
+#ifndef WIN32
+
#ifdef __NetBSD__
#include <sys/param.h>
#endif
-struct mbuf;
-struct rtentry;
-#include <net/if.h>
-
#include <netinet/in.h>
+#endif /* WIN32 */
+
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include "nlpid.h"
#include "llc.h"
#include "gencode.h"
+#include "atmuni31.h"
+#include "sunatmpos.h"
#include "ppp.h"
#include "sll.h"
#include "arcnet.h"
-#include <pcap-namedb.h>
+#include "pf.h"
#ifdef INET6
-#include <netdb.h>
-#include <sys/socket.h>
+#ifndef WIN32
+#include <netdb.h> /* for "struct addrinfo" */
+#endif /* WIN32 */
#endif /*INET6*/
+#include <pcap-namedb.h>
#define ETHERMTU 1500
static pcap_t *bpf_pcap;
/* Hack for updating VLAN offsets. */
-static u_int orig_linktype = -1, orig_nl = -1;
+static u_int orig_linktype = -1, orig_nl = -1, orig_nl_nosnap = -1;
/* XXX */
#ifdef PCAP_FDDIPAD
static struct block *gen_cmp_gt(u_int, u_int, bpf_int32);
static struct block *gen_mcmp(u_int, u_int, bpf_int32, bpf_u_int32);
static struct block *gen_bcmp(u_int, u_int, const u_char *);
+static struct block *gen_ncmp(bpf_u_int32, bpf_u_int32, bpf_u_int32,
+ bpf_u_int32, bpf_u_int32, int);
static struct block *gen_uncond(int);
static inline struct block *gen_true(void);
static inline struct block *gen_false(void);
+static struct block *gen_ether_linktype(int);
static struct block *gen_linktype(int);
static struct block *gen_snap(bpf_u_int32, bpf_u_int32, u_int);
+static struct block *gen_llc(int);
static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int);
#ifdef INET6
static struct block *gen_hostop6(struct in6_addr *, struct in6_addr *, int, int, u_int, u_int);
static struct block *gen_ehostop(const u_char *, int);
static struct block *gen_fhostop(const u_char *, int);
static struct block *gen_thostop(const u_char *, int);
+static struct block *gen_wlanhostop(const u_char *, int);
+static struct block *gen_ipfchostop(const u_char *, int);
static struct block *gen_dnhostop(bpf_u_int32, int, u_int);
static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int);
#ifdef INET6
static struct block *gen_proto(int, int, int);
static struct slist *xfer_to_x(struct arth *);
static struct slist *xfer_to_a(struct arth *);
+static struct block *gen_mac_multicast(int);
static struct block *gen_len(int, int);
+static struct block *gen_msg_abbrev(int type);
+
static void *
newchunk(n)
u_int n;
bpf_error("out of memory");
size = CHUNK0SIZE << k;
cp->m = (void *)malloc(size);
+ if (cp->m == NULL)
+ bpf_error("out of memory");
memset((char *)cp->m, 0, size);
cp->n_left = size;
if (n > size)
}
netmask = mask;
-
+
snaplen = pcap_snapshot(p);
if (snaplen == 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
return b;
}
+static struct block *
+gen_ncmp(datasize, offset, mask, jtype, jvalue, reverse)
+ bpf_u_int32 datasize, offset, mask, jtype, jvalue;
+ int reverse;
+{
+ struct slist *s;
+ struct block *b;
+
+ s = new_stmt(BPF_LD|datasize|BPF_ABS);
+ s->s.k = offset;
+
+ if (mask != 0xffffffff) {
+ s->next = new_stmt(BPF_ALU|BPF_AND|BPF_K);
+ s->next->s.k = mask;
+ }
+
+ b = new_block(JMP(jtype));
+ b->stmts = s;
+ b->s.k = jvalue;
+ if (reverse && (jtype == BPF_JGT || jtype == BPF_JGE))
+ gen_not(b);
+ return b;
+}
+
/*
* Various code constructs need to know the layout of the data link
- * layer. These variables give the necessary offsets. off_linktype
- * is set to -1 for no encapsulation, in which case, IP is assumed.
+ * layer. These variables give the necessary offsets.
+ */
+
+/*
+ * This is the offset of the beginning of the MAC-layer header.
+ * It's usually 0, except for ATM LANE.
+ */
+static u_int off_mac;
+
+/*
+ * "off_linktype" is the offset to information in the link-layer header
+ * giving the packet type.
+ *
+ * For Ethernet, it's the offset of the Ethernet type field.
+ *
+ * For link-layer types that always use 802.2 headers, it's the
+ * offset of the LLC header.
+ *
+ * For PPP, it's the offset of the PPP type field.
+ *
+ * For Cisco HDLC, it's the offset of the CHDLC type field.
+ *
+ * For BSD loopback, it's the offset of the AF_ value.
+ *
+ * For Linux cooked sockets, it's the offset of the type field.
+ *
+ * It's set to -1 for no encapsulation, in which case, IP is assumed.
*/
static u_int off_linktype;
+
+/*
+ * TRUE if the link layer includes an ATM pseudo-header.
+ */
+static int is_atm = 0;
+
+/*
+ * TRUE if "lane" appeared in the filter; it causes us to generate
+ * code that assumes LANE rather than LLC-encapsulated traffic in SunATM.
+ */
+static int is_lane = 0;
+
+/*
+ * These are offsets for the ATM pseudo-header.
+ */
+static u_int off_vpi;
+static u_int off_vci;
+static u_int off_proto;
+
+/*
+ * This is the offset of the first byte after the ATM pseudo_header,
+ * or -1 if there is no ATM pseudo-header.
+ */
+static u_int off_payload;
+
+/*
+ * These are offsets to the beginning of the network-layer header.
+ *
+ * If the link layer never uses 802.2 LLC:
+ *
+ * "off_nl" and "off_nl_nosnap" are the same.
+ *
+ * If the link layer always uses 802.2 LLC:
+ *
+ * "off_nl" is the offset if there's a SNAP header following
+ * the 802.2 header;
+ *
+ * "off_nl_nosnap" is the offset if there's no SNAP header.
+ *
+ * If the link layer is Ethernet:
+ *
+ * "off_nl" is the offset if the packet is an Ethernet II packet
+ * (we assume no 802.3+802.2+SNAP);
+ *
+ * "off_nl_nosnap" is the offset if the packet is an 802.3 packet
+ * with an 802.2 header following it.
+ */
static u_int off_nl;
+static u_int off_nl_nosnap;
+
static int linktype;
static void
{
linktype = type;
+ /*
+ * Assume it's not raw ATM with a pseudo-header, for now.
+ */
+ off_mac = 0;
+ is_atm = 0;
+ is_lane = 0;
+ off_vpi = -1;
+ off_vci = -1;
+ off_proto = -1;
+ off_payload = -1;
+
orig_linktype = -1;
orig_nl = -1;
+ orig_nl_nosnap = -1;
switch (type) {
case DLT_ARCNET:
off_linktype = 2;
- off_nl = 6; /* XXX in reality, variable! */
+ off_nl = 6; /* XXX in reality, variable! */
+ off_nl_nosnap = 6; /* no 802.2 LLC */
+ return;
+
+ case DLT_ARCNET_LINUX:
+ off_linktype = 4;
+ off_nl = 8; /* XXX in reality, variable! */
+ off_nl_nosnap = 8; /* no 802.2 LLC */
return;
case DLT_EN10MB:
off_linktype = 12;
- off_nl = 14;
+ off_nl = 14; /* Ethernet II */
+ off_nl_nosnap = 17; /* 802.3+802.2 */
return;
case DLT_SLIP:
*/
off_linktype = -1;
off_nl = 16;
+ off_nl_nosnap = 16; /* no 802.2 LLC */
return;
case DLT_SLIP_BSDOS:
off_linktype = -1;
/* XXX end */
off_nl = 24;
+ off_nl_nosnap = 24; /* no 802.2 LLC */
return;
case DLT_NULL:
case DLT_LOOP:
off_linktype = 0;
off_nl = 4;
+ off_nl_nosnap = 4; /* no 802.2 LLC */
+ return;
+
+ case DLT_ENC:
+ off_linktype = 0;
+ off_nl = 12;
+ off_nl_nosnap = 12; /* no 802.2 LLC */
+ return;
+
+ case DLT_PFLOG:
+ off_linktype = 0;
+ off_nl = 28;
+ off_nl_nosnap = 28; /* no 802.2 LLC */
return;
case DLT_PPP:
case DLT_PPP_SERIAL: /* NetBSD sync/async serial PPP */
off_linktype = 2;
off_nl = 4;
+ off_nl_nosnap = 4; /* no 802.2 LLC */
return;
case DLT_PPP_ETHER:
*/
off_linktype = 6;
off_nl = 8;
+ off_nl_nosnap = 8; /* no 802.2 LLC */
return;
case DLT_PPP_BSDOS:
off_linktype = 5;
off_nl = 24;
+ off_nl_nosnap = 24; /* no 802.2 LLC */
return;
case DLT_FDDI:
#ifdef PCAP_FDDIPAD
off_linktype += pcap_fddipad;
#endif
- off_nl = 21;
+ off_nl = 21; /* FDDI+802.2+SNAP */
+ off_nl_nosnap = 16; /* FDDI+802.2 */
#ifdef PCAP_FDDIPAD
off_nl += pcap_fddipad;
+ off_nl_nosnap += pcap_fddipad;
#endif
return;
* 8 - figure out which byte that is).
*/
off_linktype = 14;
- off_nl = 22;
+ off_nl = 22; /* Token Ring+802.2+SNAP */
+ off_nl_nosnap = 17; /* Token Ring+802.2 */
return;
case DLT_IEEE802_11:
* data frames in networks with no bridges.
*/
off_linktype = 24;
- off_nl = 30;
+ off_nl = 32; /* 802.11+802.2+SNAP */
+ off_nl_nosnap = 27; /* 802.11+802.2 */
+ return;
+
+ case DLT_PRISM_HEADER:
+ /*
+ * Same as 802.11, but with an additional header before
+ * the 802.11 header, containing a bunch of additional
+ * information including radio-level information.
+ *
+ * The header is 144 bytes long.
+ *
+ * XXX - same variable-length header problem; at least
+ * the Prism header is fixed-length.
+ */
+ off_linktype = 144+24;
+ off_nl = 144+32; /* Prism+802.11+802.2+SNAP */
+ off_nl_nosnap = 144+27; /* Prism+802.11+802.2 */
+ return;
+
+ case DLT_IEEE802_11_RADIO:
+ /*
+ * Same as 802.11, but with an additional header before
+ * the 802.11 header, containing a bunch of additional
+ * information including radio-level information.
+ *
+ * The header is 64 bytes long.
+ *
+ * XXX - same variable-length header problem, only
+ * more so; this header is also variable-length,
+ * with the length being the 32-bit big-endian
+ * number at an offset of 4 from the beginning
+ * of the radio header.
+ */
+ off_linktype = 64+24;
+ off_nl = 64+32; /* Radio+802.11+802.2+SNAP */
+ off_nl_nosnap = 64+27; /* Radio+802.11+802.2 */
return;
case DLT_ATM_RFC1483:
+ case DLT_ATM_CLIP: /* Linux ATM defines this */
/*
* assume routed, non-ISO PDUs
* (i.e., LLC = 0xAA-AA-03, OUT = 0x00-00-00)
*/
- off_linktype = 6;
- off_nl = 8;
+ off_linktype = 0;
+ off_nl = 8; /* 802.2+SNAP */
+ off_nl_nosnap = 3; /* 802.2 */
+ return;
+
+ case DLT_SUNATM:
+ /*
+ * Full Frontal ATM; you get AALn PDUs with an ATM
+ * pseudo-header.
+ */
+ is_atm = 1;
+ off_vpi = SUNATM_VPI_POS;
+ off_vci = SUNATM_VCI_POS;
+ off_proto = PROTO_POS;
+ off_mac = -1; /* LLC-encapsulated, so no MAC-layer header */
+ off_payload = SUNATM_PKT_BEGIN_POS;
+ off_linktype = off_payload;
+ off_nl = off_payload+8; /* 802.2+SNAP */
+ off_nl_nosnap = off_payload+3; /* 802.2 */
return;
case DLT_RAW:
off_linktype = -1;
off_nl = 0;
- return;
-
- case DLT_ATM_CLIP: /* Linux ATM defines this */
- off_linktype = 6;
- off_nl = 8;
+ off_nl_nosnap = 0; /* no 802.2 LLC */
return;
case DLT_LINUX_SLL: /* fake header for Linux cooked socket */
off_linktype = 14;
off_nl = 16;
+ off_nl_nosnap = 16; /* no 802.2 LLC */
return;
case DLT_LTALK:
*/
off_linktype = -1;
off_nl = 0;
+ off_nl_nosnap = 0; /* no 802.2 LLC */
+ return;
+
+ case DLT_IP_OVER_FC:
+ /*
+ * RFC 2625 IP-over-Fibre-Channel doesn't really have a
+ * link-level type field. We set "off_linktype" to the
+ * offset of the LLC header.
+ *
+ * To check for Ethernet types, we assume that SSAP = SNAP
+ * is being used and pick out the encapsulated Ethernet type.
+ * XXX - should we generate code to check for SNAP? RFC
+ * 2625 says SNAP should be used.
+ */
+ off_linktype = 16;
+ off_nl = 24; /* IPFC+802.2+SNAP */
+ off_nl_nosnap = 19; /* IPFC+802.2 */
+ return;
+
+ case DLT_FRELAY:
+ /*
+ * XXX - we should set this to handle SNAP-encapsulated
+ * frames (NLPID of 0x80).
+ */
+ off_linktype = -1;
+ off_nl = 0;
+ off_nl_nosnap = 0; /* no 802.2 LLC */
return;
}
bpf_error("unknown data link type %d", linktype);
((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
static struct block *
-gen_linktype(proto)
+gen_ether_linktype(proto)
register int proto;
{
struct block *b0, *b1;
+ switch (proto) {
+
+ case LLCSAP_ISONS:
+ /*
+ * OSI protocols always use 802.2 encapsulation.
+ * XXX - should we check both the DSAP and the
+ * SSAP, like this, or should we check just the
+ * DSAP?
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
+ gen_and(b0, b1);
+ return b1;
+
+ case LLCSAP_IP:
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_IP << 8) | LLCSAP_IP));
+ gen_and(b0, b1);
+ return b1;
+
+ case LLCSAP_NETBEUI:
+ /*
+ * NetBEUI always uses 802.2 encapsulation.
+ * XXX - should we check both the DSAP and the
+ * SSAP, like this, or should we check just the
+ * DSAP?
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
+ ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+ gen_and(b0, b1);
+ return b1;
+
+ case LLCSAP_IPX:
+ /*
+ * Check for;
+ *
+ * Ethernet_II frames, which are Ethernet
+ * frames with a frame type of ETHERTYPE_IPX;
+ *
+ * Ethernet_802.3 frames, which are 802.3
+ * frames (i.e., the type/length field is
+ * a length field, <= ETHERMTU, rather than
+ * a type field) with the first two bytes
+ * after the Ethernet/802.3 header being
+ * 0xFFFF;
+ *
+ * Ethernet_802.2 frames, which are 802.3
+ * frames with an 802.2 LLC header and
+ * with the IPX LSAP as the DSAP in the LLC
+ * header;
+ *
+ * Ethernet_SNAP frames, which are 802.3
+ * frames with an LLC header and a SNAP
+ * header and with an OUI of 0x000000
+ * (encapsulated Ethernet) and a protocol
+ * ID of ETHERTYPE_IPX in the SNAP header.
+ *
+ * XXX - should we generate the same code both
+ * for tests for LLCSAP_IPX and for ETHERTYPE_IPX?
+ */
+
+ /*
+ * This generates code to check both for the
+ * IPX LSAP (Ethernet_802.2) and for Ethernet_802.3.
+ */
+ b0 = gen_cmp(off_linktype + 2, BPF_B, (bpf_int32)LLCSAP_IPX);
+ b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)0xFFFF);
+ gen_or(b0, b1);
+
+ /*
+ * Now we add code to check for SNAP frames with
+ * ETHERTYPE_IPX, i.e. Ethernet_SNAP.
+ */
+ b0 = gen_snap(0x000000, ETHERTYPE_IPX, 14);
+ gen_or(b0, b1);
+
+ /*
+ * Now we generate code to check for 802.3
+ * frames in general.
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+
+ /*
+ * Now add the check for 802.3 frames before the
+ * check for Ethernet_802.2 and Ethernet_802.3,
+ * as those checks should only be done on 802.3
+ * frames, not on Ethernet frames.
+ */
+ gen_and(b0, b1);
+
+ /*
+ * 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 ETHERTYPE_ATALK:
+ case ETHERTYPE_AARP:
+ /*
+ * EtherTalk (AppleTalk protocols on Ethernet link
+ * layer) may use 802.2 encapsulation.
+ */
+
+ /*
+ * Check for 802.2 encapsulation (EtherTalk phase 2?);
+ * we check for an Ethernet type field less than
+ * 1500, which means it's an 802.3 length field.
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+
+ /*
+ * 802.2-encapsulated ETHERTYPE_ATALK packets are
+ * SNAP packets with an organization code of
+ * 0x080007 (Apple, for Appletalk) and a protocol
+ * type of ETHERTYPE_ATALK (Appletalk).
+ *
+ * 802.2-encapsulated ETHERTYPE_AARP packets are
+ * SNAP packets with an organization code of
+ * 0x000000 (encapsulated Ethernet) and a protocol
+ * type of ETHERTYPE_AARP (Appletalk ARP).
+ */
+ if (proto == ETHERTYPE_ATALK)
+ b1 = gen_snap(0x080007, ETHERTYPE_ATALK, 14);
+ else /* proto == ETHERTYPE_AARP */
+ b1 = gen_snap(0x000000, ETHERTYPE_AARP, 14);
+ gen_and(b0, b1);
+
+ /*
+ * Check for Ethernet encapsulation (Ethertalk
+ * phase 1?); we just check for the Ethernet
+ * protocol type.
+ */
+ b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+
+ gen_or(b0, b1);
+ return b1;
+
+ default:
+ if (proto <= ETHERMTU) {
+ /*
+ * This is an LLC SAP value, so the frames
+ * that match would be 802.2 frames.
+ * Check that the frame is an 802.2 frame
+ * (i.e., that the length/type field is
+ * a length field, <= ETHERMTU) and
+ * then check the DSAP.
+ */
+ b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
+ gen_not(b0);
+ b1 = gen_cmp(off_linktype + 2, BPF_B, (bpf_int32)proto);
+ gen_and(b0, b1);
+ return b1;
+ } else {
+ /*
+ * This is an Ethernet type, so compare
+ * the length/type field with it (if
+ * the frame is an 802.2 frame, the length
+ * field will be <= ETHERMTU, and, as
+ * "proto" is > ETHERMTU, this test
+ * will fail and the frame won't match,
+ * which is what we want).
+ */
+ return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ }
+ }
+}
+
+static struct block *
+gen_linktype(proto)
+ register int proto;
+{
+ struct block *b0, *b1, *b2;
+
switch (linktype) {
case DLT_EN10MB:
+ return gen_ether_linktype(proto);
+ break;
+
+ case DLT_C_HDLC:
+ switch (proto) {
+
+ case LLCSAP_ISONS:
+ proto = (proto << 8 | LLCSAP_ISONS);
+ /* fall through */
+
+ default:
+ return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ break;
+ }
+ break;
+
+ 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 DLT_SUNATM:
+ /*
+ * If "is_lane" is set, check for a LANE-encapsulated
+ * version of this protocol, otherwise check for an
+ * LLC-encapsulated version of this protocol.
+ *
+ * We assume LANE means Ethernet, not Token Ring.
+ */
+ if (is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b0 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b0);
+
+ /*
+ * Now generate an Ethernet test.
+ */
+ b1 = gen_ether_linktype(proto);
+ gen_and(b0, b1);
+ return b1;
+ } else {
+ /*
+ * Check for LLC encapsulation and then check the
+ * protocol.
+ */
+ b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
+ b1 = gen_llc(proto);
+ gen_and(b0, b1);
+ return b1;
+ }
+
+ case DLT_LINUX_SLL:
switch (proto) {
+ 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 LLCSAP_ISONS:
/*
* OSI protocols always use 802.2 encapsulation.
* XXX - should we check both the DSAP and the
- * SSAP, like this, or should we check just the
+ * LSAP, like this, or should we check just the
* DSAP?
*/
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
- gen_not(b0);
+ 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);
/*
* NetBEUI always uses 802.2 encapsulation.
* XXX - should we check both the DSAP and the
- * SSAP, like this, or should we check just the
+ * LSAP, like this, or should we check just the
* DSAP?
*/
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
- gen_not(b0);
+ 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);
case LLCSAP_IPX:
/*
- * Check for;
- *
* Ethernet_II frames, which are Ethernet
* frames with a frame type of ETHERTYPE_IPX;
*
- * Ethernet_802.3 frames, which are 802.3
- * frames (i.e., the type/length field is
- * a length field, <= ETHERMTU, rather than
- * a type field) with the first two bytes
- * after the Ethernet/802.3 header being
- * 0xFFFF;
+ * Ethernet_802.3 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 and
+ * 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;
*
* (encapsulated Ethernet) and a protocol
* ID of ETHERTYPE_IPX in the SNAP header.
*
- * XXX - should we generate the same code both
- * for tests for LLCSAP_IPX and for ETHERTYPE_IPX?
- */
-
- /*
- * This generates code to check both for the
- * IPX LSAP (Ethernet_802.2) and for Ethernet_802.3.
- */
- b0 = gen_cmp(off_linktype + 2, BPF_B,
- (bpf_int32)LLCSAP_IPX);
- b1 = gen_cmp(off_linktype + 2, BPF_H,
- (bpf_int32)0xFFFF);
- gen_or(b0, b1);
-
- /*
- * Now we add code to check for SNAP frames with
- * ETHERTYPE_IPX, i.e. Ethernet_SNAP.
- */
- b0 = gen_snap(0x000000, ETHERTYPE_IPX, 14);
- gen_or(b0, b1);
-
- /*
- * Now we generate code to check for 802.3
- * frames in general.
- */
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
- gen_not(b0);
-
- /*
- * Now add the check for 802.3 frames before the
- * check for Ethernet_802.2 and Ethernet_802.3,
- * as those checks should only be done on 802.3
- * frames, not on Ethernet frames.
- */
- gen_and(b0, b1);
-
- /*
- * 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 ETHERTYPE_ATALK:
- case ETHERTYPE_AARP:
- /*
- * EtherTalk (AppleTalk protocols on Ethernet link
- * layer) may use 802.2 encapsulation.
- */
-
- /*
- * Check for 802.2 encapsulation (EtherTalk phase 2?);
- * we check for an Ethernet type field less than
- * 1500, which means it's an 802.3 length field.
- */
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
- gen_not(b0);
-
- /*
- * 802.2-encapsulated ETHERTYPE_ATALK packets are
- * SNAP packets with an organization code of
- * 0x080007 (Apple, for Appletalk) and a protocol
- * type of ETHERTYPE_ATALK (Appletalk).
- *
- * 802.2-encapsulated ETHERTYPE_AARP packets are
- * SNAP packets with an organization code of
- * 0x000000 (encapsulated Ethernet) and a protocol
- * type of ETHERTYPE_AARP (Appletalk ARP).
- */
- if (proto == ETHERTYPE_ATALK)
- b1 = gen_snap(0x080007, ETHERTYPE_ATALK, 14);
- else /* proto == ETHERTYPE_AARP */
- b1 = gen_snap(0x000000, ETHERTYPE_AARP, 14);
- gen_and(b0, b1);
-
- /*
- * Check for Ethernet encapsulation (Ethertalk
- * phase 1?); we just check for the Ethernet
- * protocol type.
- */
- b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
-
- gen_or(b0, b1);
- return b1;
-
- default:
- if (proto <= ETHERMTU) {
- /*
- * This is an LLC SAP value, so the frames
- * that match would be 802.2 frames.
- * Check that the frame is an 802.2 frame
- * (i.e., that the length/type field is
- * a length field, <= ETHERMTU) and
- * then check the DSAP.
- */
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
- gen_not(b0);
- b1 = gen_cmp(off_linktype + 2, BPF_B,
- (bpf_int32)proto);
- gen_and(b0, b1);
- return b1;
- } else {
- /*
- * This is an Ethernet type, so compare
- * the length/type field with it (if
- * the frame is an 802.2 frame, the length
- * field will be <= ETHERMTU, and, as
- * "proto" is > ETHERMTU, this test
- * will fail and the frame won't match,
- * which is what we want).
- */
- return gen_cmp(off_linktype, BPF_H,
- (bpf_int32)proto);
- }
- }
- break;
-
- case DLT_IEEE802_11:
- case DLT_FDDI:
- case DLT_IEEE802:
- case DLT_ATM_RFC1483:
- case DLT_ATM_CLIP:
- /*
- * XXX - handle token-ring variable-length header.
- */
- switch (proto) {
-
- 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));
-
- case LLCSAP_IPX:
- /*
- * XXX - are there ever SNAP frames for IPX on
- * non-Ethernet 802.x networks?
- */
- return gen_cmp(off_linktype, BPF_B,
- (bpf_int32)LLCSAP_IPX);
-
- case ETHERTYPE_ATALK:
- /*
- * 802.2-encapsulated ETHERTYPE_ATALK packets are
- * SNAP packets with an organization code of
- * 0x080007 (Apple, for Appletalk) and a protocol
- * type of ETHERTYPE_ATALK (Appletalk).
- *
- * XXX - check for an organization code of
- * encapsulated Ethernet as well?
- */
- return gen_snap(0x080007, ETHERTYPE_ATALK,
- off_linktype);
- break;
-
- default:
- /*
- * XXX - we don't have to check for IPX 802.3
- * here, but should we check for the IPX Ethertype?
- */
- if (proto <= ETHERMTU) {
- /*
- * This is an LLC SAP value, so check
- * the DSAP.
- */
- return gen_cmp(off_linktype, BPF_B,
- (bpf_int32)proto);
- } else {
- /*
- * This is an Ethernet type; we assume
- * that it's unlikely that it'll
- * appear in the right place at random,
- * and therefore check only the
- * location that would hold the Ethernet
- * type in a SNAP frame with an organization
- * code of 0x000000 (encapsulated Ethernet).
- *
- * XXX - if we were to check for the SNAP DSAP
- * and LSAP, as per XXX, and were also to check
- * for an organization code of 0x000000
- * (encapsulated Ethernet), we'd do
- *
- * return gen_snap(0x000000, proto,
- * off_linktype);
- *
- * here; for now, we don't, as per the above.
- * I don't know whether it's worth the
- * extra CPU time to do the right check
- * or not.
- */
- return gen_cmp(off_linktype+6, BPF_H,
- (bpf_int32)proto);
- }
- }
- break;
-
- case DLT_LINUX_SLL:
- switch (proto) {
-
- 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;
-
- 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;
-
- 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.
+ * 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);
switch (proto) {
case ETHERTYPE_IP:
- proto = PPP_IP; /* XXX was 0x21 */
+ proto = PPP_IP;
break;
#ifdef INET6
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.
+ * word containing an AF_ value in *host* byte order,
+ * and for DLT_ENC, the link-layer header begins
+ * with a 32-bit work containing an AF_ value in
+ * host byte order.
*
* In addition, if we're reading a saved capture file,
* the host byte order in the capture may not be the
* 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) {
return gen_false();
}
- if (linktype == DLT_NULL) {
+ if (linktype == DLT_NULL || linktype == DLT_ENC) {
/*
* The AF_ value is in host byte order, but
* the BPF interpreter will convert it to
return (gen_cmp(0, BPF_W, (bpf_int32)proto));
case DLT_ARCNET:
+ case DLT_ARCNET_LINUX:
/*
* XXX should we check for first fragment if the protocol
* uses PHDS?
*/
- switch(proto) {
+ switch (proto) {
+
default:
return gen_false();
+
#ifdef INET6
case ETHERTYPE_IPV6:
- return(gen_cmp(2, BPF_B,
- (bpf_int32)htonl(ARCTYPE_INET6)));
+ return (gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_INET6));
#endif /* INET6 */
+
case ETHERTYPE_IP:
- b0 = gen_cmp(2, BPF_B, (bpf_int32)htonl(ARCTYPE_IP));
- b1 = gen_cmp(2, BPF_B,
- (bpf_int32)htonl(ARCTYPE_IP_OLD));
+ b0 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_IP);
+ b1 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_IP_OLD);
gen_or(b0, b1);
- return(b1);
+ return (b1);
+
case ETHERTYPE_ARP:
- b0 = gen_cmp(2, BPF_B, (bpf_int32)htonl(ARCTYPE_ARP));
- b1 = gen_cmp(2, BPF_B,
- (bpf_int32)htonl(ARCTYPE_ARP_OLD));
+ b0 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_ARP);
+ b1 = gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_ARP_OLD);
gen_or(b0, b1);
- return(b1);
+ return (b1);
+
case ETHERTYPE_REVARP:
- return(gen_cmp(2, BPF_B,
- (bpf_int32)htonl(ARCTYPE_REVARP)));
+ return (gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_REVARP));
+
case ETHERTYPE_ATALK:
- return(gen_cmp(2, BPF_B,
- (bpf_int32)htonl(ARCTYPE_ATALK)));
+ return (gen_cmp(off_linktype, BPF_B,
+ (bpf_int32)ARCTYPE_ATALK));
}
break;
return gen_false();
}
break;
+
+ case DLT_FRELAY:
+ /*
+ * XXX - assumes a 2-byte Frame Relay header with
+ * DLCI and flags. What if the address is longer?
+ */
+ switch (proto) {
+
+ case ETHERTYPE_IP:
+ /*
+ * Check for the special NLPID for IP.
+ */
+ return gen_cmp(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);
+#endif
+
+ case LLCSAP_ISONS:
+ /*
+ * Check for several OSI protocols.
+ *
+ * Frame Relay packets typically have an OSI
+ * NLPID at the beginning; we check for each
+ * of them.
+ *
+ * What we check for is the NLPID and a frame
+ * control field of UI, i.e. 0x03 followed
+ * by the NLPID.
+ */
+ b0 = gen_cmp(2, BPF_H, (0x03<<8) | ISO8473_CLNP);
+ b1 = gen_cmp(2, BPF_H, (0x03<<8) | ISO9542_ESIS);
+ b2 = gen_cmp(2, BPF_H, (0x03<<8) | ISO10589_ISIS);
+ gen_or(b1, b2);
+ gen_or(b0, b2);
+ return b2;
+
+ default:
+ return gen_false();
+ }
+ break;
}
/*
snapblock[0] = LLCSAP_SNAP; /* DSAP = SNAP */
snapblock[1] = LLCSAP_SNAP; /* SSAP = SNAP */
- snapblock[2] = 0x03; /* control = UI */
+ snapblock[2] = 0x03; /* control = UI */
snapblock[3] = (orgcode >> 16); /* upper 8 bits of organization code */
snapblock[4] = (orgcode >> 8); /* middle 8 bits of organization code */
snapblock[5] = (orgcode >> 0); /* lower 8 bits of organization code */
return gen_bcmp(offset, 8, snapblock);
}
+/*
+ * Check for a given protocol value assuming an 802.2 LLC header.
+ */
+static struct block *
+gen_llc(proto)
+ int proto;
+{
+ /*
+ * XXX - handle token-ring variable-length header.
+ */
+ 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));
+
+ case LLCSAP_IPX:
+ /*
+ * XXX - are there ever SNAP frames for IPX on
+ * non-Ethernet 802.x networks?
+ */
+ return gen_cmp(off_linktype, BPF_B, (bpf_int32)LLCSAP_IPX);
+
+ case ETHERTYPE_ATALK:
+ /*
+ * 802.2-encapsulated ETHERTYPE_ATALK packets are
+ * SNAP packets with an organization code of
+ * 0x080007 (Apple, for Appletalk) and a protocol
+ * type of ETHERTYPE_ATALK (Appletalk).
+ *
+ * XXX - check for an organization code of
+ * encapsulated Ethernet as well?
+ */
+ return gen_snap(0x080007, ETHERTYPE_ATALK, off_linktype);
+
+ default:
+ /*
+ * XXX - we don't have to check for IPX 802.3
+ * here, but should we check for the IPX Ethertype?
+ */
+ if (proto <= ETHERMTU) {
+ /*
+ * This is an LLC SAP value, so check
+ * the DSAP.
+ */
+ return gen_cmp(off_linktype, BPF_B, (bpf_int32)proto);
+ } else {
+ /*
+ * This is an Ethernet type; we assume that it's
+ * unlikely that it'll appear in the right place
+ * at random, and therefore check only the
+ * location that would hold the Ethernet type
+ * in a SNAP frame with an organization code of
+ * 0x000000 (encapsulated Ethernet).
+ *
+ * XXX - if we were to check for the SNAP DSAP and
+ * LSAP, as per XXX, and were also to check for an
+ * organization code of 0x000000 (encapsulated
+ * Ethernet), we'd do
+ *
+ * return gen_snap(0x000000, proto,
+ * off_linktype);
+ *
+ * here; for now, we don't, as per the above.
+ * I don't know whether it's worth the extra CPU
+ * time to do the right check or not.
+ */
+ return gen_cmp(off_linktype+6, BPF_H, (bpf_int32)proto);
+ }
+ }
+}
+
static struct block *
gen_hostop(addr, mask, dir, proto, src_off, dst_off)
bpf_u_int32 addr;
gen_and(b0, b1);
return b1;
}
-#endif /*INET6*/
+#endif /*INET6*/
+
+static struct block *
+gen_ehostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
+{
+ register struct block *b0, *b1;
+
+ switch (dir) {
+ case Q_SRC:
+ return gen_bcmp(off_mac + 6, 6, eaddr);
+
+ case Q_DST:
+ return gen_bcmp(off_mac + 0, 6, eaddr);
+
+ case Q_AND:
+ b0 = gen_ehostop(eaddr, Q_SRC);
+ b1 = gen_ehostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_ehostop(eaddr, Q_SRC);
+ b1 = gen_ehostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
+}
+
+/*
+ * Like gen_ehostop, but for DLT_FDDI
+ */
+static struct block *
+gen_fhostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
+{
+ struct block *b0, *b1;
+
+ switch (dir) {
+ case Q_SRC:
+#ifdef PCAP_FDDIPAD
+ return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr);
+#else
+ return gen_bcmp(6 + 1, 6, eaddr);
+#endif
+
+ case Q_DST:
+#ifdef PCAP_FDDIPAD
+ return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr);
+#else
+ return gen_bcmp(0 + 1, 6, eaddr);
+#endif
+
+ case Q_AND:
+ b0 = gen_fhostop(eaddr, Q_SRC);
+ b1 = gen_fhostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_fhostop(eaddr, Q_SRC);
+ b1 = gen_fhostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
+}
+/*
+ * Like gen_ehostop, but for DLT_IEEE802 (Token Ring)
+ */
static struct block *
-gen_ehostop(eaddr, dir)
+gen_thostop(eaddr, dir)
register const u_char *eaddr;
register int dir;
{
switch (dir) {
case Q_SRC:
- return gen_bcmp(6, 6, eaddr);
+ return gen_bcmp(8, 6, eaddr);
case Q_DST:
- return gen_bcmp(0, 6, eaddr);
+ return gen_bcmp(2, 6, eaddr);
case Q_AND:
- b0 = gen_ehostop(eaddr, Q_SRC);
- b1 = gen_ehostop(eaddr, Q_DST);
+ b0 = gen_thostop(eaddr, Q_SRC);
+ b1 = gen_thostop(eaddr, Q_DST);
gen_and(b0, b1);
return b1;
case Q_DEFAULT:
case Q_OR:
- b0 = gen_ehostop(eaddr, Q_SRC);
- b1 = gen_ehostop(eaddr, Q_DST);
+ b0 = gen_thostop(eaddr, Q_SRC);
+ b1 = gen_thostop(eaddr, Q_DST);
gen_or(b0, b1);
return b1;
}
}
/*
- * Like gen_ehostop, but for DLT_FDDI
+ * Like gen_ehostop, but for DLT_IEEE802_11 (802.11 wireless LAN)
*/
static struct block *
-gen_fhostop(eaddr, dir)
+gen_wlanhostop(eaddr, dir)
register const u_char *eaddr;
register int dir;
{
- struct block *b0, *b1;
+ register struct block *b0, *b1, *b2;
+ register struct slist *s;
switch (dir) {
case Q_SRC:
-#ifdef PCAP_FDDIPAD
- return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr);
-#else
- return gen_bcmp(6 + 1, 6, eaddr);
-#endif
+ /*
+ * Oh, yuk.
+ *
+ * For control frames, there is no SA.
+ *
+ * For management frames, SA is at an
+ * offset of 10 from the beginning of
+ * the packet.
+ *
+ * For data frames, SA is at an offset
+ * of 10 from the beginning of the packet
+ * if From DS is clear, at an offset of
+ * 16 from the beginning of the packet
+ * if From DS is set and To DS is clear,
+ * and an offset of 24 from the beginning
+ * of the packet if From DS is set and To DS
+ * is set.
+ */
+
+ /*
+ * Generate the tests to be done for data frames
+ * with From DS set.
+ *
+ * First, check for To DS set, i.e. check "link[1] & 0x01".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x01; /* To DS */
+ b1->stmts = s;
+
+ /*
+ * If To DS is set, the SA is at 24.
+ */
+ b0 = gen_bcmp(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;
+ 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 SA is at 16.
+ */
+ b1 = gen_bcmp(16, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * Now OR together the last two checks. That gives
+ * the complete set of checks for data frames with
+ * From DS set.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * Now check for From DS being set, and AND that with
+ * the ORed-together checks.
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x02; /* From DS */
+ b1->stmts = s;
+ gen_and(b1, b0);
+
+ /*
+ * Now check for data frames with From DS not set.
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x02; /* From DS */
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * If From DS isn't set, the SA is at 10.
+ */
+ b1 = gen_bcmp(10, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * Now OR together the checks for data frames with
+ * From DS not set and for data frames with From DS
+ * set; that gives the checks done for data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * 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 SA is at 10.
+ */
+ b1 = gen_bcmp(10, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * OR that with the checks done for data frames.
+ * That gives the checks done for management and
+ * data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * If the low-order bit of the type value is 1,
+ * this is either a control frame or a frame
+ * with a reserved type, and thus not a
+ * frame with an SA.
+ *
+ * I.e., check "!(link[0] & 0x04)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x04;
+ b1->stmts = s;
+ gen_not(b1);
+
+ /*
+ * AND that with the checks for data and management
+ * frames.
+ */
+ gen_and(b1, b0);
+ return b0;
case Q_DST:
-#ifdef PCAP_FDDIPAD
- return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr);
-#else
- return gen_bcmp(0 + 1, 6, eaddr);
-#endif
+ /*
+ * Oh, yuk.
+ *
+ * For control frames, there is no DA.
+ *
+ * For management frames, DA is at an
+ * offset of 4 from the beginning of
+ * the packet.
+ *
+ * For data frames, DA is at an offset
+ * of 4 from the beginning of the packet
+ * if To DS is clear and at an offset of
+ * 16 from the beginning of the packet
+ * if To DS is set.
+ */
+
+ /*
+ * Generate the tests to be done for data frames.
+ *
+ * First, check for To DS set, i.e. "link[1] & 0x01".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x01; /* To DS */
+ b1->stmts = s;
+
+ /*
+ * If To DS is set, the DA is at 16.
+ */
+ b0 = gen_bcmp(16, 6, eaddr);
+ gen_and(b1, b0);
+
+ /*
+ * Now, check for To DS not set, i.e. check
+ * "!(link[1] & 0x01)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x01; /* To DS */
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * If To DS is not set, the DA is at 4.
+ */
+ b1 = gen_bcmp(4, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * Now OR together the last two checks. That gives
+ * the complete set of checks for data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * Now check for a data frame.
+ * I.e, check "link[0] & 0x08".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x08;
+ b1->stmts = s;
+
+ /*
+ * AND that with the checks done for data frames.
+ */
+ gen_and(b1, b0);
+
+ /*
+ * If the high-order bit of the type value is 0, this
+ * is a management frame.
+ * I.e, check "!(link[0] & 0x08)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x08;
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * For management frames, the DA is at 4.
+ */
+ b1 = gen_bcmp(4, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * OR that with the checks done for data frames.
+ * That gives the checks done for management and
+ * data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * If the low-order bit of the type value is 1,
+ * this is either a control frame or a frame
+ * with a reserved type, and thus not a
+ * frame with an SA.
+ *
+ * I.e., check "!(link[0] & 0x04)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x04;
+ b1->stmts = s;
+ gen_not(b1);
+
+ /*
+ * AND that with the checks for data and management
+ * frames.
+ */
+ gen_and(b1, b0);
+ return b0;
case Q_AND:
- b0 = gen_fhostop(eaddr, Q_SRC);
- b1 = gen_fhostop(eaddr, Q_DST);
+ b0 = gen_wlanhostop(eaddr, Q_SRC);
+ b1 = gen_wlanhostop(eaddr, Q_DST);
gen_and(b0, b1);
return b1;
case Q_DEFAULT:
case Q_OR:
- b0 = gen_fhostop(eaddr, Q_SRC);
- b1 = gen_fhostop(eaddr, Q_DST);
+ b0 = gen_wlanhostop(eaddr, Q_SRC);
+ b1 = gen_wlanhostop(eaddr, Q_DST);
gen_or(b0, b1);
return b1;
}
}
/*
- * Like gen_ehostop, but for DLT_IEEE802 (Token Ring)
+ * Like gen_ehostop, but for RFC 2625 IP-over-Fibre-Channel.
+ * (We assume that the addresses are IEEE 48-bit MAC addresses,
+ * as the RFC states.)
*/
static struct block *
-gen_thostop(eaddr, dir)
+gen_ipfchostop(eaddr, dir)
register const u_char *eaddr;
register int dir;
{
switch (dir) {
case Q_SRC:
- return gen_bcmp(8, 6, eaddr);
+ return gen_bcmp(10, 6, eaddr);
case Q_DST:
return gen_bcmp(2, 6, eaddr);
case Q_AND:
- b0 = gen_thostop(eaddr, Q_SRC);
- b1 = gen_thostop(eaddr, Q_DST);
+ b0 = gen_ipfchostop(eaddr, Q_SRC);
+ b1 = gen_ipfchostop(eaddr, Q_DST);
gen_and(b0, b1);
return b1;
case Q_DEFAULT:
case Q_OR:
- b0 = gen_thostop(eaddr, Q_SRC);
- b1 = gen_thostop(eaddr, Q_DST);
+ b0 = gen_ipfchostop(eaddr, Q_SRC);
+ b1 = gen_ipfchostop(eaddr, Q_DST);
gen_or(b0, b1);
return b1;
}
case Q_ISO:
bpf_error("ISO host filtering not implemented");
-
+
default:
abort();
}
b0 = gen_fhostop(eaddr, Q_OR);
else if (linktype == DLT_IEEE802)
b0 = gen_thostop(eaddr, Q_OR);
+ else if (linktype == DLT_IEEE802_11)
+ b0 = gen_wlanhostop(eaddr, Q_OR);
+ else if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b1 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b1);
+
+ /*
+ * Now check the MAC address.
+ */
+ b0 = gen_ehostop(eaddr, Q_OR);
+ gen_and(b1, b0);
+ } else if (linktype == DLT_IP_OVER_FC)
+ b0 = gen_ipfchostop(eaddr, Q_OR);
else
bpf_error(
- "'gateway' supported only on ethernet, FDDI or token ring");
+ "'gateway' supported only on ethernet/FDDI/token ring/802.11/Fibre Channel");
b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR);
while (*alist) {
gen_proto_abbrev(proto)
int proto;
{
-#ifdef INET6
struct block *b0;
-#endif
struct block *b1;
switch (proto) {
b1 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
break;
+ case Q_ISIS_L1: /* all IS-IS Level1 PDU-Types */
+ b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); /* FIXME extract the circuit-type bits */
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_L2: /* all IS-IS Level2 PDU-Types */
+ b0 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT); /* FIXME extract the circuit-type bits */
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_IIH: /* all IS-IS Hello PDU-Types */
+ b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_LSP:
+ b0 = gen_proto(ISIS_L1_LSP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_LSP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_SNP:
+ b0 = gen_proto(ISIS_L1_CSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_CSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ b0 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_CSNP:
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
+ case Q_ISIS_PSNP:
+ b0 = gen_proto(ISIS_L1_PSNP, Q_ISIS, Q_DEFAULT);
+ b1 = gen_proto(ISIS_L2_PSNP, Q_ISIS, Q_DEFAULT);
+ gen_or(b0, b1);
+ break;
+
case Q_CLNP:
b1 = gen_proto(ISO8473_CLNP, Q_ISO, Q_DEFAULT);
break;
{
struct block *b0, *b1, *tmp;
- /* ether proto ip */
+ /*
+ * 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) {
/*FALLTHROUGH*/
#endif
case Q_IP:
+ /*
+ * For FDDI, RFC 1188 says that SNAP encapsulation is used,
+ * not LLC encapsulation with LLCSAP_IP.
+ *
+ * For IEEE 802 networks - which includes 802.5 token ring
+ * (which is what DLT_IEEE802 means) and 802.11 - RFC 1042
+ * says that SNAP encapsulation is used, not LLC encapsulation
+ * with LLCSAP_IP.
+ *
+ * For LLC-encapsulated ATM/"Classical IP", RFC 1483 and
+ * RFC 2225 say that SNAP encapsulation is used, not LLC
+ * encapsulation with LLCSAP_IP.
+ *
+ * So we always check for ETHERTYPE_IP.
+ */
b0 = gen_linktype(ETHERTYPE_IP);
#ifndef CHASE_CHAIN
b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v);
return b1;
case Q_ISO:
- b0 = gen_linktype(LLCSAP_ISONS);
- b1 = gen_cmp(off_nl + 3, BPF_B, (long)v);
+ switch (linktype) {
+
+ case DLT_FRELAY:
+ /*
+ * Frame Relay packets typically have an OSI
+ * NLPID at the beginning; "gen_linktype(LLCSAP_ISONS)"
+ * generates code to check for all the OSI
+ * NLPIDs, so calling it and then adding a check
+ * for the particular NLPID for which we're
+ * looking is bogus, as we can just check for
+ * the NLPID.
+ *
+ * What we check for is the NLPID and a frame
+ * control field value of UI, i.e. 0x03 followed
+ * by the NLPID.
+ *
+ * XXX - assumes a 2-byte Frame Relay header with
+ * DLCI and flags. What if the address is longer?
+ *
+ * XXX - what about SNAP-encapsulated frames?
+ */
+ return gen_cmp(2, BPF_H, (0x03<<8) | v);
+ break;
+
+ case DLT_C_HDLC:
+ /*
+ * Cisco uses an Ethertype lookalike - for OSI,
+ * it's 0xfefe.
+ */
+ b0 = gen_linktype(LLCSAP_ISONS<<8 | LLCSAP_ISONS);
+ /* OSI in C-HDLC is stuffed with a fudge byte */
+ b1 = gen_cmp(off_nl_nosnap+1, BPF_B, (long)v);
+ gen_and(b0, b1);
+ return b1;
+
+ default:
+ b0 = gen_linktype(LLCSAP_ISONS);
+ b1 = gen_cmp(off_nl_nosnap, BPF_B, (long)v);
+ gen_and(b0, b1);
+ return b1;
+ }
+
+ case Q_ISIS:
+ b0 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
+ /*
+ * 4 is the offset of the PDU type relative to the IS-IS
+ * header.
+ */
+ b1 = gen_cmp(off_nl_nosnap+4, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
free(eaddr);
return b;
- default:
- bpf_error(
- "only ethernet/FDDI/token ring supports link-level host name");
- break;
+ case DLT_IEEE802_11:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown 802.11 host '%s'", name);
+ b = gen_wlanhostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_IP_OVER_FC:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown Fibre Channel host '%s'", name);
+ b = gen_ipfchostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_SUNATM:
+ if (!is_lane)
+ break;
+
+ /*
+ * Check that the packet doesn't begin
+ * with an LE Control marker. (We've
+ * already generated a test for LANE.)
+ */
+ tmp = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
+ gen_not(tmp);
+
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown ether host '%s'", name);
+ b = gen_ehostop(eaddr, dir);
+ gen_and(tmp, b);
+ free(eaddr);
+ return b;
}
+
+ bpf_error("only ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel supports link-level host name");
} else if (proto == Q_DECNET) {
unsigned short dn_addr = __pcap_nametodnaddr(name);
/*
if (sizeof(mask) * 8 < masklen)
bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8));
+ memset(&mask, 0, sizeof(mask));
memset(&mask, 0xff, masklen / 8);
if (masklen % 8) {
mask.s6_addr[masklen / 8] =
register const u_char *eaddr;
struct qual q;
{
+ 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);
return gen_fhostop(eaddr, (int)q.dir);
if (linktype == DLT_IEEE802)
return gen_thostop(eaddr, (int)q.dir);
- bpf_error("ethernet addresses supported only on ethernet, FDDI or token ring");
+ 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");
}
bpf_error("ethernet address used in non-ether expression");
/* NOTREACHED */
bpf_error("unsupported index operation");
case Q_LINK:
+ /*
+ * XXX - what about ATM LANE? Should the index be
+ * relative to the beginning of the AAL5 frame, so
+ * that 0 refers to the beginning of the LE Control
+ * field, or relative to the beginning of the LAN
+ * frame, so that 0 refers, for Ethernet LANE, to
+ * the beginning of the destination address?
+ */
s = xfer_to_x(index);
tmp = new_stmt(BPF_LD|BPF_IND|size);
sappend(s, tmp);
s0 = xfer_to_x(a1);
s1 = xfer_to_a(a0);
- s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X);
- b = new_block(JMP(code));
- if (code == BPF_JGT || code == BPF_JGE) {
- reversed = !reversed;
- b->s.k = 0x80000000;
+ if (code == BPF_JEQ) {
+ s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X);
+ b = new_block(JMP(code));
+ sappend(s1, s2);
}
+ else
+ b = new_block(BPF_JMP|code|BPF_X);
if (reversed)
gen_not(b);
- sappend(s1, s2);
sappend(s0, s1);
sappend(a1->s, s0);
sappend(a0->s, a1->s);
sappend(a1->s, s0);
sappend(a0->s, a1->s);
+ free_reg(a0->regno);
free_reg(a1->regno);
s0 = new_stmt(BPF_ST);
case Q_DEFAULT:
case Q_LINK:
- if (linktype == DLT_ARCNET)
+ if (linktype == DLT_ARCNET || linktype == DLT_ARCNET_LINUX)
return gen_ahostop(abroadcast, Q_DST);
if (linktype == DLT_EN10MB)
return gen_ehostop(ebroadcast, Q_DST);
return gen_fhostop(ebroadcast, Q_DST);
if (linktype == DLT_IEEE802)
return gen_thostop(ebroadcast, Q_DST);
+ if (linktype == DLT_IEEE802_11)
+ return gen_wlanhostop(ebroadcast, Q_DST);
+ if (linktype == DLT_IP_OVER_FC)
+ return gen_ipfchostop(ebroadcast, Q_DST);
+ if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b1 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b1);
+
+ /*
+ * Now check the MAC address.
+ */
+ b0 = gen_ehostop(ebroadcast, Q_DST);
+ gen_and(b1, b0);
+ return b0;
+ }
bpf_error("not a broadcast link");
break;
gen_and(b0, b2);
return b2;
}
- bpf_error("only ether/ip broadcast filters supported");
+ bpf_error("only link-layer/IP broadcast filters supported");
+}
+
+/*
+ * Generate code to test the low-order bit of a MAC address (that's
+ * the bottom bit of the *first* byte).
+ */
+static struct block *
+gen_mac_multicast(offset)
+ int offset;
+{
+ register struct block *b0;
+ register struct slist *s;
+
+ /* link[offset] & 1 != 0 */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = offset;
+ b0 = new_block(JMP(BPF_JSET));
+ b0->s.k = 1;
+ b0->stmts = s;
+ return b0;
}
struct block *
gen_multicast(proto)
int proto;
{
- register struct block *b0, *b1;
+ register struct block *b0, *b1, *b2;
register struct slist *s;
switch (proto) {
case Q_DEFAULT:
case Q_LINK:
- if (linktype == DLT_ARCNET)
+ 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 */
- s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
- s->s.k = 0;
- b0 = new_block(JMP(BPF_JSET));
- b0->s.k = 1;
- b0->stmts = s;
- return b0;
+ return gen_mac_multicast(0);
}
if (linktype == DLT_FDDI) {
- /* XXX TEST THIS: MIGHT NOT PORT PROPERLY XXX */
+ /*
+ * 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;
- b0 = new_block(JMP(BPF_JSET));
- b0->s.k = 1;
- b0->stmts = s;
+ 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;
}
- /* TODO - check how token ring handles multicast */
- /* if (linktype == DLT_IEEE802) ... */
+ if (linktype == DLT_IP_OVER_FC) {
+ b0 = gen_mac_multicast(2);
+ return b0;
+ }
+
+ if (linktype == DLT_SUNATM && is_lane) {
+ /*
+ * Check that the packet doesn't begin with an
+ * LE Control marker. (We've already generated
+ * a test for LANE.)
+ */
+ b1 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b1);
+
+ /* ether[off_mac] & 1 != 0 */
+ b0 = gen_mac_multicast(off_mac);
+ gen_and(b1, b0);
+ return b0;
+ }
/* Link not known to support multicasts */
break;
return b1;
#endif /* INET6 */
}
- bpf_error("only IP multicast filters supported on ethernet/FDDI");
+ bpf_error("link-layer multicast filters supported only on ethernet/FDDI/token ring/ARCNET/802.11/ATM LANE/Fibre Channel");
}
/*
*/
switch (linktype) {
case DLT_SLIP:
- case DLT_PPP:
b0 = gen_relation(BPF_JEQ,
gen_load(Q_LINK, gen_loadi(0), 1),
gen_loadi(0),
dir);
break;
+ case DLT_LINUX_SLL:
+ if (dir) {
+ /*
+ * Match packets sent by this machine.
+ */
+ b0 = gen_cmp(0, BPF_H, LINUX_SLL_OUTGOING);
+ } else {
+ /*
+ * Match packets sent to this machine.
+ * (No broadcast or multicast packets, or
+ * packets sent to some other machine and
+ * received promiscuously.)
+ *
+ * XXX - packets sent to other machines probably
+ * shouldn't be matched, but what about broadcast
+ * or multicast packets we received?
+ */
+ b0 = gen_cmp(0, BPF_H, LINUX_SLL_HOST);
+ }
+ break;
+
+ case DLT_PFLOG:
+ b0 = gen_cmp(26, BPF_H,
+ (bpf_int32)((dir == 0) ? PF_IN : PF_OUT));
+ break;
+
default:
- bpf_error("inbound/outbound not supported on linktype %d\n",
+ bpf_error("inbound/outbound not supported on linktype %d",
linktype);
b0 = NULL;
/* NOTREACHED */
return (b0);
}
+/* 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");
+ /* NOTREACHED */
+ }
+ if (strlen(ifname) >= 16) {
+ bpf_error("ifname interface names can't be larger than 16 characters");
+ /* NOTREACHED */
+ }
+ return (gen_bcmp(4, strlen(ifname), (const u_char *)ifname));
+}
+
+
+/* PF firewall log rule number */
+struct block *
+gen_pf_rnr(int rnr)
+{
+ if (linktype != DLT_PFLOG) {
+ bpf_error("rnr supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
+
+ return (gen_cmp(20, BPF_H, (bpf_int32)rnr));
+}
+
+/* PF firewall log reason code */
+struct block *
+gen_pf_reason(int reason)
+{
+ if (linktype != DLT_PFLOG) {
+ bpf_error("reason supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
+
+ return (gen_cmp(22, BPF_H, (bpf_int32)reason));
+}
+
+/* PF firewall log action */
+struct block *
+gen_pf_action(int action)
+{
+ if (linktype != DLT_PFLOG) {
+ bpf_error("action supported only for DLT_PFLOG");
+ /* NOTREACHED */
+ }
+
+ return (gen_cmp(24, BPF_H, (bpf_int32)action));
+}
+
struct block *
gen_acode(eaddr, q)
register const u_char *eaddr;
struct qual q;
{
if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) {
- if (linktype == DLT_ARCNET)
+ if (linktype == DLT_ARCNET || linktype == DLT_ARCNET_LINUX)
return gen_ahostop(eaddr, (int)q.dir);
}
bpf_error("ARCnet address used in non-arc expression");
if (orig_nl == (u_int)-1) {
orig_linktype = off_linktype; /* save original values */
orig_nl = off_nl;
+ orig_nl_nosnap = off_nl_nosnap;
switch (linktype) {
case DLT_EN10MB:
off_linktype = 16;
+ off_nl_nosnap = 18;
off_nl = 18;
break;
return (b0);
}
+
+struct block *
+gen_atmfield_code(atmfield, jvalue, jtype, reverse)
+ int atmfield;
+ bpf_u_int32 jvalue;
+ bpf_u_int32 jtype;
+ int reverse;
+{
+ struct block *b0;
+
+ switch (atmfield) {
+
+ case A_VPI:
+ if (!is_atm)
+ bpf_error("'vpi' supported only on raw ATM");
+ if (off_vpi == -1)
+ abort();
+ b0 = gen_ncmp(BPF_B, off_vpi, 0xffffffff, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ case A_VCI:
+ if (!is_atm)
+ bpf_error("'vci' supported only on raw ATM");
+ if (off_vci == -1)
+ abort();
+ b0 = gen_ncmp(BPF_H, off_vci, 0xffffffff, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ case A_PROTOTYPE:
+ if (off_proto == -1)
+ abort(); /* XXX - this isn't on FreeBSD */
+ b0 = gen_ncmp(BPF_B, off_proto, 0x0f, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ case A_MSGTYPE:
+ if (off_payload == -1)
+ abort();
+ b0 = gen_ncmp(BPF_B, off_payload + MSG_TYPE_POS, 0xffffffff,
+ (u_int)jtype, (u_int)jvalue, reverse);
+ break;
+
+ case A_CALLREFTYPE:
+ if (!is_atm)
+ bpf_error("'callref' supported only on raw ATM");
+ if (off_proto == -1)
+ abort();
+ b0 = gen_ncmp(BPF_B, off_proto, 0xffffffff, (u_int)jtype,
+ (u_int)jvalue, reverse);
+ break;
+
+ default:
+ abort();
+ }
+ return b0;
+}
+
+struct block *
+gen_atmtype_abbrev(type)
+ int type;
+{
+ struct block *b0, *b1;
+
+ switch (type) {
+
+ case A_METAC:
+ /* Get all packets in Meta signalling Circuit */
+ if (!is_atm)
+ bpf_error("'metac' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 1, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_BCC:
+ /* Get all packets in Broadcast Circuit*/
+ if (!is_atm)
+ bpf_error("'bcc' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 2, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_OAMF4SC:
+ /* Get all cells in Segment OAM F4 circuit*/
+ if (!is_atm)
+ bpf_error("'oam4sc' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_OAMF4EC:
+ /* Get all cells in End-to-End OAM F4 Circuit*/
+ if (!is_atm)
+ bpf_error("'oam4ec' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_SC:
+ /* Get all packets in connection Signalling Circuit */
+ if (!is_atm)
+ bpf_error("'sc' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 5, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_ILMIC:
+ /* Get all packets in ILMI Circuit */
+ if (!is_atm)
+ bpf_error("'ilmic' supported only on raw ATM");
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 16, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_LANE:
+ /* Get all LANE packets */
+ if (!is_atm)
+ bpf_error("'lane' supported only on raw ATM");
+ b1 = gen_atmfield_code(A_PROTOTYPE, PT_LANE, BPF_JEQ, 0);
+
+ /*
+ * Arrange that all subsequent tests assume LANE
+ * rather than LLC-encapsulated packets, and set
+ * the offsets appropriately for LANE-encapsulated
+ * Ethernet.
+ *
+ * "off_mac" is the offset of the Ethernet header,
+ * which is 2 bytes past the ATM pseudo-header
+ * (skipping the pseudo-header and 2-byte LE Client
+ * field). The other offsets are Ethernet offsets
+ * relative to "off_mac".
+ */
+ is_lane = 1;
+ off_mac = off_payload + 2; /* MAC header */
+ off_linktype = off_mac + 12;
+ off_nl = off_mac + 14; /* Ethernet II */
+ off_nl_nosnap = off_mac + 17; /* 802.3+802.2 */
+ break;
+
+ case A_LLC:
+ /* Get all LLC-encapsulated packets */
+ if (!is_atm)
+ bpf_error("'llc' supported only on raw ATM");
+ b1 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
+ is_lane = 0;
+ break;
+
+ default:
+ abort();
+ }
+ return b1;
+}
+
+
+static struct block *
+gen_msg_abbrev(type)
+ int type;
+{
+ struct block *b1;
+
+ /*
+ * Q.2931 signalling protocol messages for handling virtual circuits
+ * establishment and teardown
+ */
+ switch (type) {
+
+ case A_SETUP:
+ b1 = gen_atmfield_code(A_MSGTYPE, SETUP, BPF_JEQ, 0);
+ break;
+
+ case A_CALLPROCEED:
+ 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;
+
+ case A_CONNECTACK:
+ b1 = gen_atmfield_code(A_MSGTYPE, CONNECT_ACK, BPF_JEQ, 0);
+ break;
+
+ case A_RELEASE:
+ b1 = gen_atmfield_code(A_MSGTYPE, RELEASE, BPF_JEQ, 0);
+ break;
+
+ case A_RELEASE_DONE:
+ b1 = gen_atmfield_code(A_MSGTYPE, RELEASE_DONE, BPF_JEQ, 0);
+ break;
+
+ default:
+ abort();
+ }
+ return b1;
+}
+
+struct block *
+gen_atmmulti_abbrev(type)
+ int type;
+{
+ struct block *b0, *b1;
+
+ switch (type) {
+
+ case A_OAM:
+ if (!is_atm)
+ bpf_error("'oam' supported only on raw ATM");
+ b1 = gen_atmmulti_abbrev(A_OAMF4);
+ break;
+
+ case A_OAMF4:
+ if (!is_atm)
+ bpf_error("'oamf4' supported only on raw ATM");
+ /* OAM F4 type */
+ b0 = gen_atmfield_code(A_VCI, 3, BPF_JEQ, 0);
+ b1 = gen_atmfield_code(A_VCI, 4, BPF_JEQ, 0);
+ gen_or(b0, b1);
+ b0 = gen_atmfield_code(A_VPI, 0, BPF_JEQ, 0);
+ gen_and(b0, b1);
+ break;
+
+ case A_CONNECTMSG:
+ /*
+ * Get Q.2931 signalling messages for switched
+ * virtual connection
+ */
+ if (!is_atm)
+ bpf_error("'connectmsg' supported only on raw ATM");
+ b0 = gen_msg_abbrev(A_SETUP);
+ b1 = gen_msg_abbrev(A_CALLPROCEED);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_CONNECT);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_CONNECTACK);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE_DONE);
+ gen_or(b0, b1);
+ b0 = gen_atmtype_abbrev(A_SC);
+ gen_and(b0, b1);
+ break;
+
+ case A_METACONNECT:
+ if (!is_atm)
+ bpf_error("'metaconnect' supported only on raw ATM");
+ b0 = gen_msg_abbrev(A_SETUP);
+ b1 = gen_msg_abbrev(A_CALLPROCEED);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_CONNECT);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE);
+ gen_or(b0, b1);
+ b0 = gen_msg_abbrev(A_RELEASE_DONE);
+ gen_or(b0, b1);
+ b0 = gen_atmtype_abbrev(A_METAC);
+ gen_and(b0, b1);
+ break;
+
+ default:
+ abort();
+ }
+ return b1;
+}
projects / libpcap / blobdiff