* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.173 2002-08-05 07:59:43 guy Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.216 2005-01-12 09:02:55 hannes 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"
+#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;
+/* Hack for updating VLAN, MPLS offsets. */
+static u_int orig_linktype = -1U, orig_nl = -1U, orig_nl_nosnap = -1U;
/* XXX */
#ifdef PCAP_FDDIPAD
-int pcap_fddipad = PCAP_FDDIPAD;
-#else
-int pcap_fddipad;
+static int pcap_fddipad;
#endif
/* VARARGS */
/* NOTREACHED */
}
-static void init_linktype(int);
+static void init_linktype(pcap_t *);
static int alloc_reg(void);
static void free_reg(int);
/*
* 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 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 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_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);
u_int n;
{
struct chunk *cp;
- int k, size;
+ int k;
+ size_t size;
#ifndef __NetBSD__
/* XXX Round up to nearest long. */
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)
}
lex_init(buf ? buf : "");
- init_linktype(pcap_datalink(p));
+ init_linktype(p);
(void)pcap_parse();
if (n_errors)
{
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;
* 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.
*/
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_proto;
/*
- * This is the offset to the message type for Q.2931 messages.
+ * 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_msg_type;
+static u_int off_payload;
/*
* These are offsets to the beginning of the network-layer header.
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_mac = 0;
is_atm = 0;
+ is_lane = 0;
off_vpi = -1;
off_vci = -1;
off_proto = -1;
- off_msg_type = -1;
+ off_payload = -1;
orig_linktype = -1;
orig_nl = -1;
orig_nl_nosnap = -1;
- switch (type) {
+ switch (linktype) {
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; /* Ethernet II */
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_PPP:
+ case DLT_PPP_WITHDIRECTION:
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 */
- off_nl_nosnap = 27; /* 802.22+802.2 */
+ off_nl_nosnap = 27; /* 802.11+802.2 */
return;
case DLT_PRISM_HEADER:
off_nl_nosnap = 144+27; /* Prism+802.11+802.2 */
return;
+ 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, 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.
+ */
+ 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_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.
+ *
+ * XXX - same variable-length header problem, only
+ * even *more* so; this header is also variable-length,
+ * with the length being the 16-bit number at an offset
+ * of 2 from the beginning of the radio header, and it's
+ * device-dependent (different devices might supply
+ * different amounts of information), so we can't even
+ * assume a fixed length for the current version of the
+ * header.
+ *
+ * Therefore, currently, only raw "link[N:M]" filtering is
+ * supported.
+ */
+ off_linktype = -1;
+ off_nl = -1;
+ off_nl_nosnap = -1;
+ return;
+
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP: /* Linux ATM defines this */
/*
* pseudo-header.
*/
is_atm = 1;
- off_linktype = SUNATM_PKT_BEGIN_POS;
off_vpi = SUNATM_VPI_POS;
off_vci = SUNATM_VCI_POS;
off_proto = PROTO_POS;
- off_msg_type = SUNATM_PKT_BEGIN_POS+MSG_TYPE_POS;
- off_nl = SUNATM_PKT_BEGIN_POS+8; /* 802.2+SNAP */
- off_nl_nosnap = SUNATM_PKT_BEGIN_POS+3; /* 802.2 */
+ 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_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
off_nl = 0;
off_nl_nosnap = 0; /* no 802.2 LLC */
return;
+
+ case DLT_APPLE_IP_OVER_IEEE1394:
+ off_linktype = 16;
+ off_nl = 18;
+ off_nl_nosnap = 0; /* 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;
+
+ case DLT_PFLOG:
+ off_linktype = 0;
+ /* XXX read from header? */
+ off_nl = PFLOG_HDRLEN;
+ off_nl_nosnap = PFLOG_HDRLEN;
+ return;
+
+ case DLT_JUNIPER_MLPPP:
+ off_linktype = 4;
+ off_nl = 4;
+ off_nl_nosnap = -1;
+ break;
+
+ 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;
+
+#ifdef DLT_PFSYNC
+ case DLT_PFSYNC:
+ off_linktype = -1;
+ off_nl = 4;
+ off_nl_nosnap = 4;
+ return;
+#endif
}
bpf_error("unknown data link type %d", linktype);
/* NOTREACHED */
((((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, *b2;
+ struct block *b0, *b1;
- switch (linktype) {
+ switch (proto) {
- case DLT_EN10MB:
- 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_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);
- case LLCSAP_NETBEUI:
+ /*
+ * 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) {
/*
- * 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?
+ * 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_H, (bpf_int32)
- ((LLCSAP_NETBEUI << 8) | LLCSAP_NETBEUI));
+ b1 = gen_cmp(off_linktype + 2, BPF_B, (bpf_int32)proto);
gen_and(b0, b1);
return b1;
-
- case LLCSAP_IPX:
+ } else {
/*
- * 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 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);
+ }
+ }
+}
- /*
- * 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);
+static struct block *
+gen_linux_sll_linktype(proto)
+ register int proto;
+{
+ struct block *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);
+ switch (proto) {
- /*
- * Now we generate code to check for 802.3
- * frames in general.
- */
- b0 = gen_cmp_gt(off_linktype, BPF_H, ETHERMTU);
- gen_not(b0);
+ case 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;
- /*
- * Now add the check for 802.3 frames before the
- * check for Ethernet_802.2 and Ethernet_802.3,
- * as those checks should only be done on 802.3
- * frames, not on Ethernet frames.
- */
- gen_and(b0, b1);
+ case 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(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.
+ */
+ 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);
+
+ /*
+ * 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);
+
+ /*
+ * 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 the 802.2 protocol type in the
+ * "Ethernet type" field.
+ */
+ b0 = gen_cmp(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).
+ *
+ * 802.2-encapsulated ETHERTYPE_AARP packets are
+ * SNAP packets with an organization code of
+ * 0x000000 (encapsulated Ethernet) and a protocol
+ * type of ETHERTYPE_AARP (Appletalk ARP).
+ */
+ if (proto == ETHERTYPE_ATALK)
+ b1 = gen_snap(0x080007, ETHERTYPE_ATALK,
+ off_linktype + 2);
+ else /* proto == ETHERTYPE_AARP */
+ b1 = gen_snap(0x000000, ETHERTYPE_AARP,
+ off_linktype + 2);
+ gen_and(b0, b1);
+
+ /*
+ * 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) {
/*
- * Now add the check for Ethernet_II frames, and
- * do that before checking for the other frame
- * types.
+ * 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,
- (bpf_int32)ETHERTYPE_IPX);
- gen_or(b0, b1);
+ LINUX_SLL_P_802_2);
+ b1 = gen_cmp(off_linktype + 2, BPF_B,
+ (bpf_int32)proto);
+ gen_and(b0, b1);
return b1;
-
- case ETHERTYPE_ATALK:
- case ETHERTYPE_AARP:
+ } else {
/*
- * EtherTalk (AppleTalk protocols on Ethernet link
- * layer) may use 802.2 encapsulation.
+ * 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);
+ }
+ }
+}
- /*
- * 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);
+static struct block *
+gen_linktype(proto)
+ register int proto;
+{
+ struct block *b0, *b1, *b2;
- /*
- * 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);
+ switch (linktype) {
- /*
- * Check for Ethernet encapsulation (Ethertalk
- * phase 1?); we just check for the Ethernet
- * protocol type.
- */
- b0 = gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ case DLT_EN10MB:
+ return gen_ether_linktype(proto);
+ /*NOTREACHED*/
+ break;
- gen_or(b0, b1);
- return b1;
+ case DLT_C_HDLC:
+ switch (proto) {
+
+ case LLCSAP_ISONS:
+ proto = (proto << 8 | LLCSAP_ISONS);
+ /* fall through */
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);
- }
+ return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto);
+ /*NOTREACHED*/
+ 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);
+ /*NOTREACHED*/
break;
case DLT_SUNATM:
/*
- * Check for LLC encapsulation and then check the protocol.
- * XXX - also check for LANE and then check for an Ethernet
- * type?
+ * 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.
*/
- 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_ISONS:
+ if (is_lane) {
/*
- * 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?
+ * 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);
- b1 = gen_cmp(off_linktype + 2, BPF_H, (bpf_int32)
- ((LLCSAP_ISONS << 8) | LLCSAP_ISONS));
- gen_and(b0, b1);
- return b1;
+ b0 = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H, 0xFF00);
+ gen_not(b0);
- 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?
+ * Now generate an Ethernet test.
*/
- 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));
+ b1 = gen_ether_linktype(proto);
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.
- */
- 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);
-
- /*
- * 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);
-
- /*
- * 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 the 802.2 protocol type in the
- * "Ethernet type" field.
- */
- b0 = gen_cmp(off_linktype, BPF_H, LINUX_SLL_P_802_2);
-
+ } else {
/*
- * 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).
+ * Check for LLC encapsulation and then check the
+ * protocol.
*/
- 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);
+ b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
+ b1 = gen_llc(proto);
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 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);
- }
}
+
+ case DLT_LINUX_SLL:
+ return gen_linux_sll_linktype(proto);
+ /*NOTREACHED*/
break;
case DLT_SLIP:
default:
return gen_false(); /* always false */
}
+ /*NOTREACHED*/
break;
case DLT_PPP:
+ case DLT_PPP_WITHDIRECTION:
case DLT_PPP_SERIAL:
case DLT_PPP_ETHER:
/*
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:
/*
* 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
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_PFLOG:
+ /*
+ * af field is host byte order in contrast to the rest of
+ * the packet.
+ */
+ if (proto == ETHERTYPE_IP)
+ return (gen_cmp(offsetof(struct pfloghdr, af), BPF_B,
+ (bpf_int32)AF_INET));
+#ifdef INET6
+ else if (proto == ETHERTYPE_IPV6)
+ return (gen_cmp(offsetof(struct pfloghdr, af), BPF_B,
+ (bpf_int32)AF_INET6));
+#endif /* INET6 */
+ else
+ return gen_false();
+ /*NOTREACHED*/
+ break;
+
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));
}
+ /*NOTREACHED*/
break;
case DLT_LTALK:
default:
return gen_false();
}
+ /*NOTREACHED*/
break;
case DLT_FRELAY:
default:
return gen_false();
}
+ /*NOTREACHED*/
break;
+
+ case DLT_JUNIPER_MLPPP:
+ case DLT_JUNIPER_ATM1:
+ case DLT_JUNIPER_ATM2:
+ /* just lets verify the magic number for now -
+ * 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(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");
}
/*
*
* Therefore, if "off_linktype" is -1, there's an error.
*/
- if (off_linktype == -1)
+ if (off_linktype == (u_int)-1)
abort();
/*
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 */
*/
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));
switch (dir) {
case Q_SRC:
- return gen_bcmp(6, 6, eaddr);
+ return gen_bcmp(off_mac + 6, 6, eaddr);
case Q_DST:
- return gen_bcmp(0, 6, eaddr);
+ return gen_bcmp(off_mac + 0, 6, eaddr);
case Q_AND:
b0 = gen_ehostop(eaddr, Q_SRC);
/* NOTREACHED */
}
+/*
+ * Like gen_ehostop, but for DLT_IEEE802_11 (802.11 wireless LAN)
+ */
+static struct block *
+gen_wlanhostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
+{
+ register struct block *b0, *b1, *b2;
+ register struct slist *s;
+
+ switch (dir) {
+ case Q_SRC:
+ /*
+ * 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:
+ /*
+ * Oh, yuk.
+ *
+ * For control frames, there is no DA.
+ *
+ * For management frames, DA is at an
+ * offset of 4 from the beginning of
+ * the packet.
+ *
+ * For data frames, DA is at an offset
+ * of 4 from the beginning of the packet
+ * if To DS is clear and at an offset of
+ * 16 from the beginning of the packet
+ * if To DS is set.
+ */
+
+ /*
+ * Generate the tests to be done for data frames.
+ *
+ * First, check for To DS set, i.e. "link[1] & 0x01".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x01; /* To DS */
+ b1->stmts = s;
+
+ /*
+ * If To DS is set, the DA is at 16.
+ */
+ b0 = gen_bcmp(16, 6, eaddr);
+ gen_and(b1, b0);
+
+ /*
+ * Now, check for To DS not set, i.e. check
+ * "!(link[1] & 0x01)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 1;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x01; /* To DS */
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * If To DS is not set, the DA is at 4.
+ */
+ b1 = gen_bcmp(4, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * Now OR together the last two checks. That gives
+ * the complete set of checks for data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * Now check for a data frame.
+ * I.e, check "link[0] & 0x08".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x08;
+ b1->stmts = s;
+
+ /*
+ * AND that with the checks done for data frames.
+ */
+ gen_and(b1, b0);
+
+ /*
+ * If the high-order bit of the type value is 0, this
+ * is a management frame.
+ * I.e, check "!(link[0] & 0x08)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b2 = new_block(JMP(BPF_JSET));
+ b2->s.k = 0x08;
+ b2->stmts = s;
+ gen_not(b2);
+
+ /*
+ * For management frames, the DA is at 4.
+ */
+ b1 = gen_bcmp(4, 6, eaddr);
+ gen_and(b2, b1);
+
+ /*
+ * OR that with the checks done for data frames.
+ * That gives the checks done for management and
+ * data frames.
+ */
+ gen_or(b1, b0);
+
+ /*
+ * If the low-order bit of the type value is 1,
+ * this is either a control frame or a frame
+ * with a reserved type, and thus not a
+ * frame with an SA.
+ *
+ * I.e., check "!(link[0] & 0x04)".
+ */
+ s = new_stmt(BPF_LD|BPF_B|BPF_ABS);
+ s->s.k = 0;
+ b1 = new_block(JMP(BPF_JSET));
+ b1->s.k = 0x04;
+ b1->stmts = s;
+ gen_not(b1);
+
+ /*
+ * AND that with the checks for data and management
+ * frames.
+ */
+ gen_and(b1, b0);
+ return b0;
+
+ case Q_AND:
+ b0 = gen_wlanhostop(eaddr, Q_SRC);
+ b1 = gen_wlanhostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_wlanhostop(eaddr, Q_SRC);
+ b1 = gen_wlanhostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
+}
+
+/*
+ * Like gen_ehostop, but for RFC 2625 IP-over-Fibre-Channel.
+ * (We assume that the addresses are IEEE 48-bit MAC addresses,
+ * as the RFC states.)
+ */
+static struct block *
+gen_ipfchostop(eaddr, dir)
+ register const u_char *eaddr;
+ register int dir;
+{
+ register struct block *b0, *b1;
+
+ switch (dir) {
+ case Q_SRC:
+ return gen_bcmp(10, 6, eaddr);
+
+ case Q_DST:
+ return gen_bcmp(2, 6, eaddr);
+
+ case Q_AND:
+ b0 = gen_ipfchostop(eaddr, Q_SRC);
+ b1 = gen_ipfchostop(eaddr, Q_DST);
+ gen_and(b0, b1);
+ return b1;
+
+ case Q_DEFAULT:
+ case Q_OR:
+ b0 = gen_ipfchostop(eaddr, Q_SRC);
+ b1 = gen_ipfchostop(eaddr, Q_DST);
+ gen_or(b0, b1);
+ return b1;
+ }
+ abort();
+ /* NOTREACHED */
+}
+
/*
* This is quite tricky because there may be pad bytes in front of the
* DECNET header, and then there are two possible data packet formats that
return b1;
case Q_ISO:
- bpf_error("ISO host filtering not implemented");
+ bpf_error("ISO host filtering not implemented");
default:
abort();
case Q_DEFAULT:
b0 = gen_host(addr, mask, Q_IP, dir);
- if (off_linktype != -1) {
+ 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);
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) {
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 */
+ 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_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);
+ 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;
default:
{
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);
* XXX - what about SNAP-encapsulated frames?
*/
return gen_cmp(2, BPF_H, (0x03<<8) | v);
+ /*NOTREACHED*/
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);
return b1;
}
+ case Q_ISIS:
+ b0 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
+ /*
+ * 4 is the offset of the PDU type relative to the IS-IS
+ * header.
+ */
+ b1 = gen_cmp(off_nl_nosnap+4, BPF_B, (long)v);
+ gen_and(b0, b1);
+ return b1;
+
case Q_ARP:
bpf_error("arp does not encapsulate another protocol");
/* NOTREACHED */
free(eaddr);
return b;
- case DLT_IEEE802:
+ case DLT_IEEE802:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown token ring host '%s'", name);
+ b = gen_thostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_IEEE802_11:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown 802.11 host '%s'", name);
+ b = gen_wlanhostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_IP_OVER_FC:
+ eaddr = pcap_ether_hostton(name);
+ if (eaddr == NULL)
+ bpf_error(
+ "unknown Fibre Channel host '%s'", name);
+ b = gen_ipfchostop(eaddr, dir);
+ free(eaddr);
+ return b;
+
+ case DLT_SUNATM:
+ if (!is_lane)
+ break;
+
+ /*
+ * Check that the packet doesn't begin
+ * with an LE Control marker. (We've
+ * already generated a test for LANE.)
+ */
+ tmp = gen_cmp(SUNATM_PKT_BEGIN_POS, BPF_H,
+ 0xFF00);
+ gen_not(tmp);
+
eaddr = pcap_ether_hostton(name);
if (eaddr == NULL)
bpf_error(
- "unknown token ring host '%s'", name);
- b = gen_thostop(eaddr, dir);
+ "unknown ether host '%s'", name);
+ b = gen_ehostop(eaddr, dir);
+ gen_and(tmp, b);
free(eaddr);
return b;
-
- default:
- bpf_error(
- "only ethernet/FDDI/token ring supports link-level host name");
- break;
}
+
+ 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 (alist == NULL || *alist == NULL)
bpf_error("unknown host '%s'", name);
tproto = proto;
- if (off_linktype == -1 && tproto == Q_DEFAULT)
+ if (off_linktype == (u_int)-1 && tproto == Q_DEFAULT)
tproto = Q_IP;
b = gen_host(**alist++, 0xffffffff, tproto, dir);
while (*alist) {
bpf_error("Mask syntax for networks only");
/* NOTREACHED */
}
+ /* NOTREACHED */
}
struct block *
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);
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");
+ /* NOTREACHED */
+}
+
+/*
+ * 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;
- b0 = new_block(JMP(BPF_JSET));
- b0->s.k = 1;
- b0->stmts = s;
+ 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;
}
- /* 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");
+ /* NOTREACHED */
}
/*
*/
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(offsetof(struct pfloghdr, dir), BPF_B,
+ (bpf_int32)((dir == 0) ? PF_IN : PF_OUT));
+ break;
+
+ case DLT_PPP_WITHDIRECTION:
+ if (dir) {
+ /* match outgoing packets */
+ b0 = gen_cmp(0, BPF_B, PPP_WITHDIRECTION_OUT);
+ } else {
+ /* match incoming packets */
+ b0 = gen_cmp(0, BPF_B, PPP_WITHDIRECTION_IN);
+ }
+ break;
+
+ case DLT_JUNIPER_MLPPP:
+ case DLT_JUNIPER_ATM1:
+ case DLT_JUNIPER_ATM2:
+ /* juniper flags (including direction) are stored
+ * the byte after the 3-byte magic number */
+ if (dir) {
+ /* match outgoing packets */
+ b0 = gen_mcmp(3, BPF_B, 0, 0x01);
+ } else {
+ /* match incoming packets */
+ b0 = gen_mcmp(3, BPF_B, 1, 0x01);
+ }
+ 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)
+{
+ 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) >= len) {
+ bpf_error("ifname interface names can only be %d characters",
+ len-1);
+ /* NOTREACHED */
+ }
+ b0 = gen_bcmp(off, strlen(ifname), (const u_char *)ifname);
+ return (b0);
+}
+
+/* PF firewall log matched interface */
+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(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(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("srnr not supported on linktype 0x%x", linktype);
+ /* NOTREACHED */
+ }
+
+ b0 = gen_cmp(offsetof(struct pfloghdr, subrulenr), BPF_W,
+ (bpf_int32)srnr);
+ return (b0);
+}
+
+/* PF firewall log reason code */
+struct block *
+gen_pf_reason(int reason)
+{
+ struct block *b0;
+
+ if (linktype == DLT_PFLOG) {
+ b0 = gen_cmp(offsetof(struct pfloghdr, reason), BPF_B,
+ (bpf_int32)reason);
+ } else {
+ bpf_error("reason not supported on linktype 0x%x", linktype);
+ /* NOTREACHED */
+ }
+
+ return (b0);
+}
+
+/* PF firewall log action */
+struct block *
+gen_pf_action(int action)
+{
+ struct block *b0;
+
+ if (linktype == DLT_PFLOG) {
+ b0 = gen_cmp(offsetof(struct pfloghdr, action), BPF_B,
+ (bpf_int32)action);
+ } else {
+ bpf_error("action not supported on linktype 0x%x", linktype);
+ /* NOTREACHED */
+ }
+
+ return (b0);
+}
+
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 (vlan_num >= 0) {
struct block *b1;
- b1 = gen_cmp(orig_nl, BPF_H, (bpf_int32)vlan_num);
+ b1 = gen_mcmp(orig_nl, BPF_H, (bpf_int32)vlan_num, 0x0fff);
+ gen_and(b0, b1);
+ b0 = b1;
+ }
+
+ return (b0);
+}
+
+/*
+ * support for MPLS
+ */
+struct block *
+gen_mpls(label_num)
+ int label_num;
+{
+ struct block *b0;
+
+ /*
+ * Change the offsets to point to the type and data fields within
+ * the MPLS packet. This is somewhat of a kludge.
+ */
+ if (orig_nl == (u_int)-1) {
+ orig_linktype = off_linktype; /* save original values */
+ orig_nl = off_nl;
+ orig_nl_nosnap = off_nl_nosnap;
+
+ switch (linktype) {
+
+ case DLT_EN10MB:
+ off_linktype = 16;
+ off_nl_nosnap = 18;
+ off_nl = 18;
+
+ b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_MPLS);
+ break;
+
+ case DLT_PPP:
+ off_linktype = 6;
+ off_nl_nosnap = 8;
+ off_nl = 8;
+
+ b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)PPP_MPLS_UCAST);
+ break;
+
+ case DLT_C_HDLC:
+ off_linktype = 6;
+ off_nl_nosnap = 8;
+ off_nl = 8;
+
+ b0 = gen_cmp(orig_linktype, BPF_H, (bpf_int32)ETHERTYPE_MPLS);
+ 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);
+ /*NOTREACHED*/
+ }
+ } else {
+ bpf_error("'mpls' can't be combined with 'vlan' or another 'mpls'");
+ /*NOTREACHED*/
+ }
+
+ /* If a specific MPLS label is requested, check it */
+ if (label_num >= 0) {
+ struct block *b1;
+
+ label_num = label_num << 12; /* label is shifted 12 bits on the wire */
+ b1 = gen_mcmp(orig_nl, BPF_W, (bpf_int32)label_num, 0xfffff000); /* only compare the first 20 bits */
gen_and(b0, b1);
b0 = b1;
}
case A_VPI:
if (!is_atm)
bpf_error("'vpi' supported only on raw ATM");
- if (off_vpi == -1)
+ if (off_vpi == (u_int)-1)
abort();
b0 = gen_ncmp(BPF_B, off_vpi, 0xffffffff, (u_int)jtype,
(u_int)jvalue, reverse);
case A_VCI:
if (!is_atm)
bpf_error("'vci' supported only on raw ATM");
- if (off_vci == -1)
+ if (off_vci == (u_int)-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)
+ 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);
break;
case A_MSGTYPE:
- if (off_msg_type == -1)
+ if (off_payload == (u_int)-1)
abort();
- b0 = gen_ncmp(BPF_B, off_msg_type, 0xffffffff,
+ 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)
+ if (off_proto == (u_int)-1)
abort();
b0 = gen_ncmp(BPF_B, off_proto, 0xffffffff, (u_int)jtype,
(u_int)jvalue, reverse);
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:
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:
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