#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.290.2.16 2008-09-22 20:16:01 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef WIN32
#include <pcap-stdinc.h>
#else
#include <sys/types.h>
#include <sys/socket.h>
#endif
#ifdef __MINGW32__
#include "IP6_misc.h"
#endif
#ifndef WIN32
#ifdef __NetBSD__
#include <sys/param.h>
#endif
#include <netinet/in.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <memory.h>
#include <setjmp.h>
#include <stdarg.h>
#ifdef MSDOS
#include "pcap-dos.h"
#endif
#include "pcap-int.h"
#include "ethertype.h"
#include "nlpid.h"
#include "llc.h"
#include "gencode.h"
#include "ieee80211.h"
#include "atmuni31.h"
#include "sunatmpos.h"
#include "ppp.h"
#include "pcap/sll.h"
#include "arcnet.h"
#ifdef HAVE_NET_PFVAR_H
#include <sys/socket.h>
#include <net/if.h>
#include <net/pfvar.h>
#include <net/if_pflog.h>
#endif
#ifndef offsetof
#define offsetof(s, e) ((size_t)&((s *)0)->e)
#endif
#ifdef INET6
#ifndef WIN32
#include <netdb.h>
#endif
#endif
#include <pcap/namedb.h>
#define ETHERMTU 1500
#ifndef IPPROTO_SCTP
#define IPPROTO_SCTP 132
#endif
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
#define JMP(c) ((c)|BPF_JMP|BPF_K)
static jmp_buf top_ctx;
static pcap_t *bpf_pcap;
#ifdef WIN32
static u_int orig_linktype = (u_int)-1, orig_nl = (u_int)-1, label_stack_depth = (u_int)-1;
#else
static u_int orig_linktype = -1U, orig_nl = -1U, label_stack_depth = -1U;
#endif
#ifdef PCAP_FDDIPAD
static int pcap_fddipad;
#endif
void
bpf_error(const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
if (bpf_pcap != NULL)
(void)vsnprintf(pcap_geterr(bpf_pcap), PCAP_ERRBUF_SIZE,
fmt, ap);
va_end(ap);
longjmp(top_ctx, 1);
}
static void init_linktype(pcap_t *);
static void init_regs(void);
static int alloc_reg(void);
static void free_reg(int);
static struct block *root;
enum e_offrel {
OR_PACKET,
OR_LINK,
OR_MACPL,
OR_NET,
OR_NET_NOSNAP,
OR_TRAN_IPV4,
OR_TRAN_IPV6
};
#define NCHUNKS 16
#define CHUNK0SIZE 1024
struct chunk {
u_int n_left;
void *m;
};
static struct chunk chunks[NCHUNKS];
static int cur_chunk;
static void *newchunk(u_int);
static void freechunks(void);
static inline struct block *new_block(int);
static inline struct slist *new_stmt(int);
static struct block *gen_retblk(int);
static inline void syntax(void);
static void backpatch(struct block *, struct block *);
static void merge(struct block *, struct block *);
static struct block *gen_cmp(enum e_offrel, u_int, u_int, bpf_int32);
static struct block *gen_cmp_gt(enum e_offrel, u_int, u_int, bpf_int32);
static struct block *gen_cmp_ge(enum e_offrel, u_int, u_int, bpf_int32);
static struct block *gen_cmp_lt(enum e_offrel, u_int, u_int, bpf_int32);
static struct block *gen_cmp_le(enum e_offrel, u_int, u_int, bpf_int32);
static struct block *gen_mcmp(enum e_offrel, u_int, u_int, bpf_int32,
bpf_u_int32);
static struct block *gen_bcmp(enum e_offrel, u_int, u_int, const u_char *);
static struct block *gen_ncmp(enum e_offrel, bpf_u_int32, bpf_u_int32,
bpf_u_int32, bpf_u_int32, int, bpf_int32);
static struct slist *gen_load_llrel(u_int, u_int);
static struct slist *gen_load_macplrel(u_int, u_int);
static struct slist *gen_load_a(enum e_offrel, u_int, u_int);
static struct slist *gen_loadx_iphdrlen(void);
static struct block *gen_uncond(int);
static inline struct block *gen_true(void);
static inline struct block *gen_false(void);
static struct block *gen_ether_linktype(int);
static struct block *gen_linux_sll_linktype(int);
static struct slist *gen_load_prism_llprefixlen(void);
static struct slist *gen_load_avs_llprefixlen(void);
static struct slist *gen_load_radiotap_llprefixlen(void);
static struct slist *gen_load_ppi_llprefixlen(void);
static void insert_compute_vloffsets(struct block *);
static struct slist *gen_llprefixlen(void);
static struct slist *gen_off_macpl(void);
static int ethertype_to_ppptype(int);
static struct block *gen_linktype(int);
static struct block *gen_snap(bpf_u_int32, bpf_u_int32);
static struct block *gen_llc_linktype(int);
static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int);
#ifdef INET6
static struct block *gen_hostop6(struct in6_addr *, struct in6_addr *, int, int, u_int, u_int);
#endif
static struct block *gen_ahostop(const u_char *, int);
static struct block *gen_ehostop(const u_char *, int);
static struct block *gen_fhostop(const u_char *, int);
static struct block *gen_thostop(const u_char *, int);
static struct block *gen_wlanhostop(const u_char *, int);
static struct block *gen_ipfchostop(const u_char *, int);
static struct block *gen_dnhostop(bpf_u_int32, int);
static struct block *gen_mpls_linktype(int);
static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int, int);
#ifdef INET6
static struct block *gen_host6(struct in6_addr *, struct in6_addr *, int, int, int);
#endif
#ifndef INET6
static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int);
#endif
static struct block *gen_ipfrag(void);
static struct block *gen_portatom(int, bpf_int32);
static struct block *gen_portrangeatom(int, bpf_int32, bpf_int32);
#ifdef INET6
static struct block *gen_portatom6(int, bpf_int32);
static struct block *gen_portrangeatom6(int, bpf_int32, bpf_int32);
#endif
struct block *gen_portop(int, int, int);
static struct block *gen_port(int, int, int);
struct block *gen_portrangeop(int, int, int, int);
static struct block *gen_portrange(int, int, int, int);
#ifdef INET6
struct block *gen_portop6(int, int, int);
static struct block *gen_port6(int, int, int);
struct block *gen_portrangeop6(int, int, int, int);
static struct block *gen_portrange6(int, int, int, int);
#endif
static int lookup_proto(const char *, int);
static struct block *gen_protochain(int, int, int);
static struct block *gen_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_check_802_11_data_frame(void);
static struct block *gen_ppi_dlt_check(void);
static struct block *gen_msg_abbrev(int type);
static void *
newchunk(n)
u_int n;
{
struct chunk *cp;
int k;
size_t size;
#ifndef __NetBSD__
n = (n + sizeof(long) - 1) & ~(sizeof(long) - 1);
#else
n = ALIGN(n);
#endif
cp = &chunks[cur_chunk];
if (n > cp->n_left) {
++cp, k = ++cur_chunk;
if (k >= NCHUNKS)
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)
bpf_error("out of memory");
}
cp->n_left -= n;
return (void *)((char *)cp->m + cp->n_left);
}
static void
freechunks()
{
int i;
cur_chunk = 0;
for (i = 0; i < NCHUNKS; ++i)
if (chunks[i].m != NULL) {
free(chunks[i].m);
chunks[i].m = NULL;
}
}
char *
sdup(s)
register const char *s;
{
int n = strlen(s) + 1;
char *cp = newchunk(n);
strlcpy(cp, s, n);
return (cp);
}
static inline struct block *
new_block(code)
int code;
{
struct block *p;
p = (struct block *)newchunk(sizeof(*p));
p->s.code = code;
p->head = p;
return p;
}
static inline struct slist *
new_stmt(code)
int code;
{
struct slist *p;
p = (struct slist *)newchunk(sizeof(*p));
p->s.code = code;
return p;
}
static struct block *
gen_retblk(v)
int v;
{
struct block *b = new_block(BPF_RET|BPF_K);
b->s.k = v;
return b;
}
static inline void
syntax()
{
bpf_error("syntax error in filter expression");
}
static bpf_u_int32 netmask;
static int snaplen;
int no_optimize;
int
pcap_compile(pcap_t *p, struct bpf_program *program,
const char *buf, int optimize, bpf_u_int32 mask)
{
extern int n_errors;
const char * volatile xbuf = buf;
int len;
no_optimize = 0;
n_errors = 0;
root = NULL;
bpf_pcap = p;
init_regs();
if (setjmp(top_ctx)) {
lex_cleanup();
freechunks();
return (-1);
}
netmask = mask;
snaplen = pcap_snapshot(p);
if (snaplen == 0) {
snprintf(p->errbuf, PCAP_ERRBUF_SIZE,
"snaplen of 0 rejects all packets");
return -1;
}
lex_init(xbuf ? xbuf : "");
init_linktype(p);
(void)pcap_parse();
if (n_errors)
syntax();
if (root == NULL)
root = gen_retblk(snaplen);
if (optimize && !no_optimize) {
bpf_optimize(&root);
if (root == NULL ||
(root->s.code == (BPF_RET|BPF_K) && root->s.k == 0))
bpf_error("expression rejects all packets");
}
program->bf_insns = icode_to_fcode(root, &len);
program->bf_len = len;
lex_cleanup();
freechunks();
return (0);
}
int
pcap_compile_nopcap(int snaplen_arg, int linktype_arg,
struct bpf_program *program,
const char *buf, int optimize, bpf_u_int32 mask)
{
pcap_t *p;
int ret;
p = pcap_open_dead(linktype_arg, snaplen_arg);
if (p == NULL)
return (-1);
ret = pcap_compile(p, program, buf, optimize, mask);
pcap_close(p);
return (ret);
}
void
pcap_freecode(struct bpf_program *program)
{
program->bf_len = 0;
if (program->bf_insns != NULL) {
free((char *)program->bf_insns);
program->bf_insns = NULL;
}
}
static void
backpatch(list, target)
struct block *list, *target;
{
struct block *next;
while (list) {
if (!list->sense) {
next = JT(list);
JT(list) = target;
} else {
next = JF(list);
JF(list) = target;
}
list = next;
}
}
static void
merge(b0, b1)
struct block *b0, *b1;
{
register struct block **p = &b0;
while (*p)
p = !((*p)->sense) ? &JT(*p) : &JF(*p);
*p = b1;
}
void
finish_parse(p)
struct block *p;
{
struct block *ppi_dlt_check;
insert_compute_vloffsets(p->head);
ppi_dlt_check = gen_ppi_dlt_check();
if (ppi_dlt_check != NULL)
gen_and(ppi_dlt_check, p);
backpatch(p, gen_retblk(snaplen));
p->sense = !p->sense;
backpatch(p, gen_retblk(0));
root = p->head;
}
void
gen_and(b0, b1)
struct block *b0, *b1;
{
backpatch(b0, b1->head);
b0->sense = !b0->sense;
b1->sense = !b1->sense;
merge(b1, b0);
b1->sense = !b1->sense;
b1->head = b0->head;
}
void
gen_or(b0, b1)
struct block *b0, *b1;
{
b0->sense = !b0->sense;
backpatch(b0, b1->head);
b0->sense = !b0->sense;
merge(b1, b0);
b1->head = b0->head;
}
void
gen_not(b)
struct block *b;
{
b->sense = !b->sense;
}
static struct block *
gen_cmp(offrel, offset, size, v)
enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
{
return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JEQ, 0, v);
}
static struct block *
gen_cmp_gt(offrel, offset, size, v)
enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
{
return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGT, 0, v);
}
static struct block *
gen_cmp_ge(offrel, offset, size, v)
enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
{
return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGE, 0, v);
}
static struct block *
gen_cmp_lt(offrel, offset, size, v)
enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
{
return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGE, 1, v);
}
static struct block *
gen_cmp_le(offrel, offset, size, v)
enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
{
return gen_ncmp(offrel, offset, size, 0xffffffff, BPF_JGT, 1, v);
}
static struct block *
gen_mcmp(offrel, offset, size, v, mask)
enum e_offrel offrel;
u_int offset, size;
bpf_int32 v;
bpf_u_int32 mask;
{
return gen_ncmp(offrel, offset, size, mask, BPF_JEQ, 0, v);
}
static struct block *
gen_bcmp(offrel, offset, size, v)
enum e_offrel offrel;
register u_int offset, size;
register const u_char *v;
{
register struct block *b, *tmp;
b = NULL;
while (size >= 4) {
register const u_char *p = &v[size - 4];
bpf_int32 w = ((bpf_int32)p[0] << 24) |
((bpf_int32)p[1] << 16) | ((bpf_int32)p[2] << 8) | p[3];
tmp = gen_cmp(offrel, offset + size - 4, BPF_W, w);
if (b != NULL)
gen_and(b, tmp);
b = tmp;
size -= 4;
}
while (size >= 2) {
register const u_char *p = &v[size - 2];
bpf_int32 w = ((bpf_int32)p[0] << 8) | p[1];
tmp = gen_cmp(offrel, offset + size - 2, BPF_H, w);
if (b != NULL)
gen_and(b, tmp);
b = tmp;
size -= 2;
}
if (size > 0) {
tmp = gen_cmp(offrel, offset, BPF_B, (bpf_int32)v[0]);
if (b != NULL)
gen_and(b, tmp);
b = tmp;
}
return b;
}
static struct block *
gen_ncmp(offrel, offset, size, mask, jtype, reverse, v)
enum e_offrel offrel;
bpf_int32 v;
bpf_u_int32 offset, size, mask, jtype;
int reverse;
{
struct slist *s, *s2;
struct block *b;
s = gen_load_a(offrel, offset, size);
if (mask != 0xffffffff) {
s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K);
s2->s.k = mask;
sappend(s, s2);
}
b = new_block(JMP(jtype));
b->stmts = s;
b->s.k = v;
if (reverse && (jtype == BPF_JGT || jtype == BPF_JGE))
gen_not(b);
return b;
}
static u_int off_ll;
static int reg_off_ll;
static u_int off_mac;
static u_int off_macpl;
static int off_macpl_is_variable;
static int reg_off_macpl;
static u_int off_linktype;
static int is_pppoes = 0;
static int is_atm = 0;
static int is_lane = 0;
static u_int off_vpi;
static u_int off_vci;
static u_int off_proto;
static u_int off_li;
static u_int off_sio;
static u_int off_opc;
static u_int off_dpc;
static u_int off_sls;
static u_int off_payload;
static u_int off_nl;
static u_int off_nl_nosnap;
static int linktype;
static void
init_linktype(p)
pcap_t *p;
{
linktype = pcap_datalink(p);
#ifdef PCAP_FDDIPAD
pcap_fddipad = p->fddipad;
#endif
off_mac = 0;
is_atm = 0;
is_lane = 0;
off_vpi = -1;
off_vci = -1;
off_proto = -1;
off_payload = -1;
is_pppoes = 0;
off_li = -1;
off_sio = -1;
off_opc = -1;
off_dpc = -1;
off_sls = -1;
off_ll = 0;
off_macpl = 0;
off_macpl_is_variable = 0;
orig_linktype = -1;
orig_nl = -1;
label_stack_depth = 0;
reg_off_ll = -1;
reg_off_macpl = -1;
switch (linktype) {
case DLT_ARCNET:
off_linktype = 2;
off_macpl = 6;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_ARCNET_LINUX:
off_linktype = 4;
off_macpl = 8;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_EN10MB:
off_linktype = 12;
off_macpl = 14;
off_nl = 0;
off_nl_nosnap = 3;
return;
case DLT_SLIP:
off_linktype = -1;
off_macpl = 16;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_SLIP_BSDOS:
off_linktype = -1;
off_macpl = 24;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_NULL:
case DLT_LOOP:
off_linktype = 0;
off_macpl = 4;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_ENC:
off_linktype = 0;
off_macpl = 12;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_PPP:
case DLT_PPP_PPPD:
case DLT_C_HDLC:
case DLT_PPP_SERIAL:
off_linktype = 2;
off_macpl = 4;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_PPP_ETHER:
off_linktype = 6;
off_macpl = 8;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_PPP_BSDOS:
off_linktype = 5;
off_macpl = 24;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_FDDI:
off_linktype = 13;
#ifdef PCAP_FDDIPAD
off_linktype += pcap_fddipad;
#endif
off_macpl = 13;
#ifdef PCAP_FDDIPAD
off_macpl += pcap_fddipad;
#endif
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_IEEE802:
off_linktype = 14;
off_macpl = 14;
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
off_linktype = 24;
off_macpl = 0;
off_macpl_is_variable = 1;
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_PPI:
off_linktype = 24;
off_macpl = 0;
off_macpl_is_variable = 1;
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP:
off_linktype = 0;
off_macpl = 0;
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_SUNATM:
is_atm = 1;
off_vpi = SUNATM_VPI_POS;
off_vci = SUNATM_VCI_POS;
off_proto = PROTO_POS;
off_mac = -1;
off_payload = SUNATM_PKT_BEGIN_POS;
off_linktype = off_payload;
off_macpl = off_payload;
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_RAW:
off_linktype = -1;
off_macpl = 0;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_LINUX_SLL:
off_linktype = 14;
off_macpl = 16;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_LTALK:
off_linktype = -1;
off_macpl = 0;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_IP_OVER_FC:
off_linktype = 16;
off_macpl = 16;
off_nl = 8;
off_nl_nosnap = 3;
return;
case DLT_FRELAY:
off_linktype = -1;
off_macpl = 0;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_MFR:
off_linktype = -1;
off_macpl = 0;
off_nl = 4;
off_nl_nosnap = 0;
return;
case DLT_APPLE_IP_OVER_IEEE1394:
off_linktype = 16;
off_macpl = 18;
off_nl = 0;
off_nl_nosnap = 0;
return;
case DLT_LINUX_IRDA:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_DOCSIS:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_SYMANTEC_FIREWALL:
off_linktype = 6;
off_macpl = 44;
off_nl = 0;
off_nl_nosnap = 0;
return;
#ifdef HAVE_NET_PFVAR_H
case DLT_PFLOG:
off_linktype = 0;
off_macpl = PFLOG_HDRLEN;
off_nl = 0;
off_nl_nosnap = 0;
return;
#endif
case DLT_JUNIPER_MFR:
case DLT_JUNIPER_MLFR:
case DLT_JUNIPER_MLPPP:
case DLT_JUNIPER_PPP:
case DLT_JUNIPER_CHDLC:
case DLT_JUNIPER_FRELAY:
off_linktype = 4;
off_macpl = 4;
off_nl = 0;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_ATM1:
off_linktype = 4;
off_macpl = 4;
off_nl = 0;
off_nl_nosnap = 10;
return;
case DLT_JUNIPER_ATM2:
off_linktype = 8;
off_macpl = 8;
off_nl = 0;
off_nl_nosnap = 10;
return;
case DLT_JUNIPER_PPPOE:
case DLT_JUNIPER_ETHER:
off_macpl = 14;
off_linktype = 16;
off_nl = 18;
off_nl_nosnap = 21;
return;
case DLT_JUNIPER_PPPOE_ATM:
off_linktype = 4;
off_macpl = 6;
off_nl = 0;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_GGSN:
off_linktype = 6;
off_macpl = 12;
off_nl = 0;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_ES:
off_linktype = 6;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_MONITOR:
off_linktype = 12;
off_macpl = 12;
off_nl = 0;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_SERVICES:
off_linktype = 12;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_VP:
off_linktype = 18;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_ST:
off_linktype = 18;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_JUNIPER_ISM:
off_linktype = 8;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_MTP2:
off_li = 2;
off_sio = 3;
off_opc = 4;
off_dpc = 4;
off_sls = 7;
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_MTP2_WITH_PHDR:
off_li = 6;
off_sio = 7;
off_opc = 8;
off_dpc = 8;
off_sls = 11;
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_ERF:
off_li = 22;
off_sio = 23;
off_opc = 24;
off_dpc = 24;
off_sls = 27;
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
#ifdef DLT_PFSYNC
case DLT_PFSYNC:
off_linktype = -1;
off_macpl = 4;
off_nl = 0;
off_nl_nosnap = 0;
return;
#endif
case DLT_LINUX_LAPD:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_USB:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_BLUETOOTH_HCI_H4:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_USB_LINUX:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_CAN20B:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_IEEE802_15_4_LINUX:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_IEEE802_16_MAC_CPS_RADIO:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_IEEE802_15_4:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_SITA:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_RAIF1:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_IPMB:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_BLUETOOTH_HCI_H4_WITH_PHDR:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
case DLT_AX25_KISS:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
off_mac = 1;
return;
case DLT_IEEE802_15_4_NONASK_PHY:
off_linktype = -1;
off_macpl = -1;
off_nl = -1;
off_nl_nosnap = -1;
return;
}
bpf_error("unknown data link type %d", linktype);
}
static struct slist *
gen_load_llrel(offset, size)
u_int offset, size;
{
struct slist *s, *s2;
s = gen_llprefixlen();
if (s != NULL) {
s2 = new_stmt(BPF_LD|BPF_IND|size);
s2->s.k = offset;
sappend(s, s2);
} else {
s = new_stmt(BPF_LD|BPF_ABS|size);
s->s.k = offset + off_ll;
}
return s;
}
static struct slist *
gen_load_macplrel(offset, size)
u_int offset, size;
{
struct slist *s, *s2;
s = gen_off_macpl();
if (s != NULL) {
s2 = new_stmt(BPF_LD|BPF_IND|size);
s2->s.k = offset;
sappend(s, s2);
} else {
s = new_stmt(BPF_LD|BPF_ABS|size);
s->s.k = off_macpl + offset;
}
return s;
}
static struct slist *
gen_load_a(offrel, offset, size)
enum e_offrel offrel;
u_int offset, size;
{
struct slist *s, *s2;
switch (offrel) {
case OR_PACKET:
s = new_stmt(BPF_LD|BPF_ABS|size);
s->s.k = offset;
break;
case OR_LINK:
s = gen_load_llrel(offset, size);
break;
case OR_MACPL:
s = gen_load_macplrel(offset, size);
break;
case OR_NET:
s = gen_load_macplrel(off_nl + offset, size);
break;
case OR_NET_NOSNAP:
s = gen_load_macplrel(off_nl_nosnap + offset, size);
break;
case OR_TRAN_IPV4:
s = gen_loadx_iphdrlen();
s2 = new_stmt(BPF_LD|BPF_IND|size);
s2->s.k = off_macpl + off_nl + offset;
sappend(s, s2);
break;
case OR_TRAN_IPV6:
s = gen_load_macplrel(off_nl + 40 + offset, size);
break;
default:
abort();
return NULL;
}
return s;
}
static struct slist *
gen_loadx_iphdrlen()
{
struct slist *s, *s2;
s = gen_off_macpl();
if (s != NULL) {
s2 = new_stmt(BPF_LD|BPF_IND|BPF_B);
s2->s.k = off_nl;
sappend(s, s2);
s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K);
s2->s.k = 0xf;
sappend(s, s2);
s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K);
s2->s.k = 2;
sappend(s, s2);
sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
sappend(s, new_stmt(BPF_MISC|BPF_TAX));
} else {
s = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
s->s.k = off_macpl + off_nl;
}
return s;
}
static struct block *
gen_uncond(rsense)
int rsense;
{
struct block *b;
struct slist *s;
s = new_stmt(BPF_LD|BPF_IMM);
s->s.k = !rsense;
b = new_block(JMP(BPF_JEQ));
b->stmts = s;
return b;
}
static inline struct block *
gen_true()
{
return gen_uncond(1);
}
static inline struct block *
gen_false()
{
return gen_uncond(0);
}
#define SWAPLONG(y) \
((((y)&0xff)<<24) | (((y)&0xff00)<<8) | (((y)&0xff0000)>>8) | (((y)>>24)&0xff))
static struct block *
gen_ether_linktype(proto)
register int proto;
{
struct block *b0, *b1;
switch (proto) {
case LLCSAP_ISONS:
case LLCSAP_IP:
case LLCSAP_NETBEUI:
b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
b1 = gen_cmp(OR_MACPL, 0, BPF_H, (bpf_int32)
((proto << 8) | proto));
gen_and(b0, b1);
return b1;
case LLCSAP_IPX:
b0 = gen_cmp(OR_MACPL, 0, BPF_B, (bpf_int32)LLCSAP_IPX);
b1 = gen_cmp(OR_MACPL, 0, BPF_H, (bpf_int32)0xFFFF);
gen_or(b0, b1);
b0 = gen_snap(0x000000, ETHERTYPE_IPX);
gen_or(b0, b1);
b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
gen_and(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)ETHERTYPE_IPX);
gen_or(b0, b1);
return b1;
case ETHERTYPE_ATALK:
case ETHERTYPE_AARP:
b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
if (proto == ETHERTYPE_ATALK)
b1 = gen_snap(0x080007, ETHERTYPE_ATALK);
else
b1 = gen_snap(0x000000, ETHERTYPE_AARP);
gen_and(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
gen_or(b0, b1);
return b1;
default:
if (proto <= ETHERMTU) {
b0 = gen_cmp_gt(OR_LINK, off_linktype, BPF_H, ETHERMTU);
gen_not(b0);
b1 = gen_cmp(OR_LINK, off_linktype + 2, BPF_B,
(bpf_int32)proto);
gen_and(b0, b1);
return b1;
} else {
return gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)proto);
}
}
}
static struct block *
gen_linux_sll_linktype(proto)
register int proto;
{
struct block *b0, *b1;
switch (proto) {
case LLCSAP_ISONS:
case LLCSAP_IP:
case LLCSAP_NETBEUI:
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2);
b1 = gen_cmp(OR_MACPL, 0, BPF_H, (bpf_int32)
((proto << 8) | proto));
gen_and(b0, b1);
return b1;
case LLCSAP_IPX:
b0 = gen_cmp(OR_MACPL, 0, BPF_B, (bpf_int32)LLCSAP_IPX);
b1 = gen_snap(0x000000, ETHERTYPE_IPX);
gen_or(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2);
gen_and(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_3);
gen_or(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)ETHERTYPE_IPX);
gen_or(b0, b1);
return b1;
case ETHERTYPE_ATALK:
case ETHERTYPE_AARP:
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, LINUX_SLL_P_802_2);
if (proto == ETHERTYPE_ATALK)
b1 = gen_snap(0x080007, ETHERTYPE_ATALK);
else
b1 = gen_snap(0x000000, ETHERTYPE_AARP);
gen_and(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
gen_or(b0, b1);
return b1;
default:
if (proto <= ETHERMTU) {
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
LINUX_SLL_P_802_2);
b1 = gen_cmp(OR_LINK, off_macpl, BPF_B,
(bpf_int32)proto);
gen_and(b0, b1);
return b1;
} else {
return gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)proto);
}
}
}
static struct slist *
gen_load_prism_llprefixlen()
{
struct slist *s1, *s2;
struct slist *sjeq_avs_cookie;
struct slist *sjcommon;
no_optimize = 1;
if (reg_off_ll != -1) {
s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
s1->s.k = 0;
s2 = new_stmt(BPF_ALU|BPF_AND|BPF_K);
s2->s.k = 0xFFFFF000;
sappend(s1, s2);
sjeq_avs_cookie = new_stmt(JMP(BPF_JEQ));
sjeq_avs_cookie->s.k = 0x80211000;
sappend(s1, sjeq_avs_cookie);
s2 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
s2->s.k = 4;
sappend(s1, s2);
sjeq_avs_cookie->s.jt = s2;
sjcommon = new_stmt(JMP(BPF_JA));
sjcommon->s.k = 1;
sappend(s1, sjcommon);
s2 = new_stmt(BPF_LD|BPF_W|BPF_IMM);
s2->s.k = 144;
sappend(s1, s2);
sjeq_avs_cookie->s.jf = s2;
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_ll;
sappend(s1, s2);
sjcommon->s.jf = s2;
s2 = new_stmt(BPF_MISC|BPF_TAX);
sappend(s1, s2);
return (s1);
} else
return (NULL);
}
static struct slist *
gen_load_avs_llprefixlen()
{
struct slist *s1, *s2;
if (reg_off_ll != -1) {
s1 = new_stmt(BPF_LD|BPF_W|BPF_ABS);
s1->s.k = 4;
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_ll;
sappend(s1, s2);
s2 = new_stmt(BPF_MISC|BPF_TAX);
sappend(s1, s2);
return (s1);
} else
return (NULL);
}
static struct slist *
gen_load_radiotap_llprefixlen()
{
struct slist *s1, *s2;
if (reg_off_ll != -1) {
s1 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
s1->s.k = 3;
s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K);
sappend(s1, s2);
s2->s.k = 8;
s2 = new_stmt(BPF_MISC|BPF_TAX);
sappend(s1, s2);
s2 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
sappend(s1, s2);
s2->s.k = 2;
s2 = new_stmt(BPF_ALU|BPF_OR|BPF_X);
sappend(s1, s2);
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_ll;
sappend(s1, s2);
s2 = new_stmt(BPF_MISC|BPF_TAX);
sappend(s1, s2);
return (s1);
} else
return (NULL);
}
static struct slist *
gen_load_ppi_llprefixlen()
{
struct slist *s1, *s2;
if (reg_off_ll != -1) {
s1 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
s1->s.k = 3;
s2 = new_stmt(BPF_ALU|BPF_LSH|BPF_K);
sappend(s1, s2);
s2->s.k = 8;
s2 = new_stmt(BPF_MISC|BPF_TAX);
sappend(s1, s2);
s2 = new_stmt(BPF_LD|BPF_B|BPF_ABS);
sappend(s1, s2);
s2->s.k = 2;
s2 = new_stmt(BPF_ALU|BPF_OR|BPF_X);
sappend(s1, s2);
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_ll;
sappend(s1, s2);
s2 = new_stmt(BPF_MISC|BPF_TAX);
sappend(s1, s2);
return (s1);
} else
return (NULL);
}
static struct slist *
gen_load_802_11_header_len(struct slist *s, struct slist *snext)
{
struct slist *s2;
struct slist *sjset_data_frame_1;
struct slist *sjset_data_frame_2;
struct slist *sjset_qos;
struct slist *sjset_radiotap_flags;
struct slist *sjset_radiotap_tsft;
struct slist *sjset_tsft_datapad, *sjset_notsft_datapad;
struct slist *s_roundup;
if (reg_off_macpl == -1) {
return (s);
}
no_optimize = 1;
if (s == NULL) {
s = new_stmt(BPF_LDX|BPF_IMM);
s->s.k = off_ll;
}
s2 = new_stmt(BPF_MISC|BPF_TXA);
sappend(s, s2);
s2 = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s2->s.k = 24;
sappend(s, s2);
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_macpl;
sappend(s, s2);
s2 = new_stmt(BPF_LD|BPF_IND|BPF_B);
s2->s.k = 0;
sappend(s, s2);
sjset_data_frame_1 = new_stmt(JMP(BPF_JSET));
sjset_data_frame_1->s.k = 0x08;
sappend(s, sjset_data_frame_1);
sjset_data_frame_1->s.jt = sjset_data_frame_2 = new_stmt(JMP(BPF_JSET));
sjset_data_frame_2->s.k = 0x04;
sappend(s, sjset_data_frame_2);
sjset_data_frame_1->s.jf = snext;
sjset_data_frame_2->s.jt = snext;
sjset_data_frame_2->s.jf = sjset_qos = new_stmt(JMP(BPF_JSET));
sjset_qos->s.k = 0x80;
sappend(s, sjset_qos);
sjset_qos->s.jt = s2 = new_stmt(BPF_LD|BPF_MEM);
s2->s.k = reg_off_macpl;
sappend(s, s2);
s2 = new_stmt(BPF_ALU|BPF_ADD|BPF_IMM);
s2->s.k = 2;
sappend(s, s2);
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_macpl;
sappend(s, s2);
if (linktype == DLT_IEEE802_11_RADIO) {
sjset_qos->s.jf = s2 = new_stmt(BPF_LD|BPF_ABS|BPF_W);
s2->s.k = 4;
sappend(s, s2);
sjset_radiotap_flags = new_stmt(JMP(BPF_JSET));
sjset_radiotap_flags->s.k = SWAPLONG(0x00000002);
sappend(s, sjset_radiotap_flags);
sjset_radiotap_flags->s.jf = snext;
sjset_radiotap_tsft = sjset_radiotap_flags->s.jt =
new_stmt(JMP(BPF_JSET));
sjset_radiotap_tsft->s.k = SWAPLONG(0x00000001);
sappend(s, sjset_radiotap_tsft);
sjset_radiotap_tsft->s.jt = s2 = new_stmt(BPF_LD|BPF_ABS|BPF_B);
s2->s.k = 16;
sappend(s, s2);
sjset_tsft_datapad = new_stmt(JMP(BPF_JSET));
sjset_tsft_datapad->s.k = 0x20;
sappend(s, sjset_tsft_datapad);
sjset_radiotap_tsft->s.jf = s2 = new_stmt(BPF_LD|BPF_ABS|BPF_B);
s2->s.k = 8;
sappend(s, s2);
sjset_notsft_datapad = new_stmt(JMP(BPF_JSET));
sjset_notsft_datapad->s.k = 0x20;
sappend(s, sjset_notsft_datapad);
s_roundup = new_stmt(BPF_LD|BPF_MEM);
s_roundup->s.k = reg_off_macpl;
sappend(s, s_roundup);
s2 = new_stmt(BPF_ALU|BPF_ADD|BPF_IMM);
s2->s.k = 3;
sappend(s, s2);
s2 = new_stmt(BPF_ALU|BPF_AND|BPF_IMM);
s2->s.k = ~3;
sappend(s, s2);
s2 = new_stmt(BPF_ST);
s2->s.k = reg_off_macpl;
sappend(s, s2);
sjset_tsft_datapad->s.jt = s_roundup;
sjset_tsft_datapad->s.jf = snext;
sjset_notsft_datapad->s.jt = s_roundup;
sjset_notsft_datapad->s.jf = snext;
} else
sjset_qos->s.jf = snext;
return s;
}
static void
insert_compute_vloffsets(b)
struct block *b;
{
struct slist *s;
switch (linktype) {
case DLT_PRISM_HEADER:
s = gen_load_prism_llprefixlen();
break;
case DLT_IEEE802_11_RADIO_AVS:
s = gen_load_avs_llprefixlen();
break;
case DLT_IEEE802_11_RADIO:
s = gen_load_radiotap_llprefixlen();
break;
case DLT_PPI:
s = gen_load_ppi_llprefixlen();
break;
default:
s = NULL;
break;
}
switch (linktype) {
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
s = gen_load_802_11_header_len(s, b->stmts);
break;
}
if (s != NULL) {
sappend(s, b->stmts);
b->stmts = s;
}
}
static struct block *
gen_ppi_dlt_check(void)
{
struct slist *s_load_dlt;
struct block *b;
if (linktype == DLT_PPI)
{
s_load_dlt = new_stmt(BPF_LD|BPF_W|BPF_ABS);
s_load_dlt->s.k = 4;
b = new_block(JMP(BPF_JEQ));
b->stmts = s_load_dlt;
b->s.k = SWAPLONG(DLT_IEEE802_11);
}
else
{
b = NULL;
}
return b;
}
static struct slist *
gen_prism_llprefixlen(void)
{
struct slist *s;
if (reg_off_ll == -1) {
reg_off_ll = alloc_reg();
}
s = new_stmt(BPF_LDX|BPF_MEM);
s->s.k = reg_off_ll;
return s;
}
static struct slist *
gen_avs_llprefixlen(void)
{
struct slist *s;
if (reg_off_ll == -1) {
reg_off_ll = alloc_reg();
}
s = new_stmt(BPF_LDX|BPF_MEM);
s->s.k = reg_off_ll;
return s;
}
static struct slist *
gen_radiotap_llprefixlen(void)
{
struct slist *s;
if (reg_off_ll == -1) {
reg_off_ll = alloc_reg();
}
s = new_stmt(BPF_LDX|BPF_MEM);
s->s.k = reg_off_ll;
return s;
}
static struct slist *
gen_ppi_llprefixlen(void)
{
struct slist *s;
if (reg_off_ll == -1) {
reg_off_ll = alloc_reg();
}
s = new_stmt(BPF_LDX|BPF_MEM);
s->s.k = reg_off_ll;
return s;
}
static struct slist *
gen_llprefixlen(void)
{
switch (linktype) {
case DLT_PRISM_HEADER:
return gen_prism_llprefixlen();
case DLT_IEEE802_11_RADIO_AVS:
return gen_avs_llprefixlen();
case DLT_IEEE802_11_RADIO:
return gen_radiotap_llprefixlen();
case DLT_PPI:
return gen_ppi_llprefixlen();
default:
return NULL;
}
}
static struct slist *
gen_off_macpl(void)
{
struct slist *s;
if (off_macpl_is_variable) {
if (reg_off_macpl == -1) {
reg_off_macpl = alloc_reg();
}
s = new_stmt(BPF_LDX|BPF_MEM);
s->s.k = reg_off_macpl;
return s;
} else {
return NULL;
}
}
static int
ethertype_to_ppptype(proto)
int proto;
{
switch (proto) {
case ETHERTYPE_IP:
proto = PPP_IP;
break;
#ifdef INET6
case ETHERTYPE_IPV6:
proto = PPP_IPV6;
break;
#endif
case ETHERTYPE_DN:
proto = PPP_DECNET;
break;
case ETHERTYPE_ATALK:
proto = PPP_APPLE;
break;
case ETHERTYPE_NS:
proto = PPP_NS;
break;
case LLCSAP_ISONS:
proto = PPP_OSI;
break;
case LLCSAP_8021D:
proto = PPP_BRPDU;
break;
case LLCSAP_IPX:
proto = PPP_IPX;
break;
}
return (proto);
}
static struct block *
gen_linktype(proto)
register int proto;
{
struct block *b0, *b1, *b2;
if (label_stack_depth > 0) {
switch (proto) {
case ETHERTYPE_IP:
case PPP_IP:
return gen_mpls_linktype(Q_IP);
case ETHERTYPE_IPV6:
case PPP_IPV6:
return gen_mpls_linktype(Q_IPV6);
default:
bpf_error("unsupported protocol over mpls");
}
}
if (is_pppoes) {
proto = ethertype_to_ppptype(proto);
return gen_cmp(OR_MACPL, off_linktype, BPF_H, (bpf_int32)proto);
}
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);
default:
return gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)proto);
break;
}
break;
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
b0 = gen_check_802_11_data_frame();
b1 = gen_llc_linktype(proto);
gen_and(b0, b1);
return b1;
break;
case DLT_FDDI:
return gen_llc_linktype(proto);
break;
case DLT_IEEE802:
return gen_llc_linktype(proto);
break;
case DLT_ATM_RFC1483:
case DLT_ATM_CLIP:
case DLT_IP_OVER_FC:
return gen_llc_linktype(proto);
break;
case DLT_SUNATM:
if (is_lane) {
b0 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
0xFF00);
gen_not(b0);
b1 = gen_ether_linktype(proto);
gen_and(b0, b1);
return b1;
} else {
b0 = gen_atmfield_code(A_PROTOTYPE, PT_LLC, BPF_JEQ, 0);
b1 = gen_llc_linktype(proto);
gen_and(b0, b1);
return b1;
}
break;
case DLT_LINUX_SLL:
return gen_linux_sll_linktype(proto);
break;
case DLT_SLIP:
case DLT_SLIP_BSDOS:
case DLT_RAW:
switch (proto) {
case ETHERTYPE_IP:
return gen_mcmp(OR_LINK, 0, BPF_B, 0x40, 0xF0);
#ifdef INET6
case ETHERTYPE_IPV6:
return gen_mcmp(OR_LINK, 0, BPF_B, 0x60, 0xF0);
#endif
default:
return gen_false();
}
break;
case DLT_PPP:
case DLT_PPP_PPPD:
case DLT_PPP_SERIAL:
case DLT_PPP_ETHER:
proto = ethertype_to_ppptype(proto);
return gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
break;
case DLT_PPP_BSDOS:
switch (proto) {
case ETHERTYPE_IP:
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_IP);
b1 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_VJC);
gen_or(b0, b1);
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H, PPP_VJNC);
gen_or(b1, b0);
return b0;
default:
proto = ethertype_to_ppptype(proto);
return gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)proto);
}
break;
case DLT_NULL:
case DLT_LOOP:
case DLT_ENC:
switch (proto) {
case ETHERTYPE_IP:
proto = AF_INET;
break;
#ifdef INET6
case ETHERTYPE_IPV6:
proto = AF_INET6;
break;
#endif
default:
return gen_false();
}
if (linktype == DLT_NULL || linktype == DLT_ENC) {
if (bpf_pcap->sf.rfile != NULL &&
bpf_pcap->sf.swapped)
proto = SWAPLONG(proto);
proto = htonl(proto);
}
return (gen_cmp(OR_LINK, 0, BPF_W, (bpf_int32)proto));
#ifdef HAVE_NET_PFVAR_H
case DLT_PFLOG:
if (proto == ETHERTYPE_IP)
return (gen_cmp(OR_LINK, offsetof(struct pfloghdr, af),
BPF_B, (bpf_int32)AF_INET));
#ifdef INET6
else if (proto == ETHERTYPE_IPV6)
return (gen_cmp(OR_LINK, offsetof(struct pfloghdr, af),
BPF_B, (bpf_int32)AF_INET6));
#endif
else
return gen_false();
break;
#endif
case DLT_ARCNET:
case DLT_ARCNET_LINUX:
switch (proto) {
default:
return gen_false();
#ifdef INET6
case ETHERTYPE_IPV6:
return (gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_INET6));
#endif
case ETHERTYPE_IP:
b0 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_IP);
b1 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_IP_OLD);
gen_or(b0, b1);
return (b1);
case ETHERTYPE_ARP:
b0 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_ARP);
b1 = gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_ARP_OLD);
gen_or(b0, b1);
return (b1);
case ETHERTYPE_REVARP:
return (gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_REVARP));
case ETHERTYPE_ATALK:
return (gen_cmp(OR_LINK, off_linktype, BPF_B,
(bpf_int32)ARCTYPE_ATALK));
}
break;
case DLT_LTALK:
switch (proto) {
case ETHERTYPE_ATALK:
return gen_true();
default:
return gen_false();
}
break;
case DLT_FRELAY:
switch (proto) {
case ETHERTYPE_IP:
return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | 0xcc);
#ifdef INET6
case ETHERTYPE_IPV6:
return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | 0x8e);
#endif
case LLCSAP_ISONS:
b0 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO8473_CLNP);
b1 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO9542_ESIS);
b2 = gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | ISO10589_ISIS);
gen_or(b1, b2);
gen_or(b0, b2);
return b2;
default:
return gen_false();
}
break;
case DLT_MFR:
bpf_error("Multi-link Frame Relay link-layer type filtering not implemented");
case DLT_JUNIPER_MFR:
case DLT_JUNIPER_MLFR:
case DLT_JUNIPER_MLPPP:
case DLT_JUNIPER_ATM1:
case DLT_JUNIPER_ATM2:
case DLT_JUNIPER_PPPOE:
case DLT_JUNIPER_PPPOE_ATM:
case DLT_JUNIPER_GGSN:
case DLT_JUNIPER_ES:
case DLT_JUNIPER_MONITOR:
case DLT_JUNIPER_SERVICES:
case DLT_JUNIPER_ETHER:
case DLT_JUNIPER_PPP:
case DLT_JUNIPER_FRELAY:
case DLT_JUNIPER_CHDLC:
case DLT_JUNIPER_VP:
case DLT_JUNIPER_ST:
case DLT_JUNIPER_ISM:
return gen_mcmp(OR_LINK, 0, BPF_W, 0x4d474300, 0xffffff00);
case DLT_LINUX_IRDA:
bpf_error("IrDA link-layer type filtering not implemented");
case DLT_DOCSIS:
bpf_error("DOCSIS link-layer type filtering not implemented");
case DLT_MTP2:
case DLT_MTP2_WITH_PHDR:
bpf_error("MTP2 link-layer type filtering not implemented");
case DLT_ERF:
bpf_error("ERF link-layer type filtering not implemented");
#ifdef DLT_PFSYNC
case DLT_PFSYNC:
bpf_error("PFSYNC link-layer type filtering not implemented");
#endif
case DLT_LINUX_LAPD:
bpf_error("LAPD link-layer type filtering not implemented");
case DLT_USB:
case DLT_USB_LINUX:
bpf_error("USB link-layer type filtering not implemented");
case DLT_BLUETOOTH_HCI_H4:
case DLT_BLUETOOTH_HCI_H4_WITH_PHDR:
bpf_error("Bluetooth link-layer type filtering not implemented");
case DLT_CAN20B:
bpf_error("CAN20B link-layer type filtering not implemented");
case DLT_IEEE802_15_4:
case DLT_IEEE802_15_4_LINUX:
case DLT_IEEE802_15_4_NONASK_PHY:
bpf_error("IEEE 802.15.4 link-layer type filtering not implemented");
case DLT_IEEE802_16_MAC_CPS_RADIO:
bpf_error("IEEE 802.16 link-layer type filtering not implemented");
case DLT_SITA:
bpf_error("SITA link-layer type filtering not implemented");
case DLT_RAIF1:
bpf_error("RAIF1 link-layer type filtering not implemented");
case DLT_IPMB:
bpf_error("IPMB link-layer type filtering not implemented");
case DLT_AX25_KISS:
bpf_error("AX.25 link-layer type filtering not implemented");
}
if (off_linktype == (u_int)-1)
abort();
return gen_cmp(OR_LINK, off_linktype, BPF_H, (bpf_int32)proto);
}
static struct block *
gen_snap(orgcode, ptype)
bpf_u_int32 orgcode;
bpf_u_int32 ptype;
{
u_char snapblock[8];
snapblock[0] = LLCSAP_SNAP;
snapblock[1] = LLCSAP_SNAP;
snapblock[2] = 0x03;
snapblock[3] = (orgcode >> 16);
snapblock[4] = (orgcode >> 8);
snapblock[5] = (orgcode >> 0);
snapblock[6] = (ptype >> 8);
snapblock[7] = (ptype >> 0);
return gen_bcmp(OR_MACPL, 0, 8, snapblock);
}
static struct block *
gen_llc_linktype(proto)
int proto;
{
switch (proto) {
case LLCSAP_IP:
case LLCSAP_ISONS:
case LLCSAP_NETBEUI:
return gen_cmp(OR_MACPL, 0, BPF_H, (bpf_u_int32)
((proto << 8) | proto));
case LLCSAP_IPX:
return gen_cmp(OR_MACPL, 0, BPF_B,
(bpf_int32)LLCSAP_IPX);
case ETHERTYPE_ATALK:
return gen_snap(0x080007, ETHERTYPE_ATALK);
default:
if (proto <= ETHERMTU) {
return gen_cmp(OR_MACPL, 0, BPF_B, (bpf_int32)proto);
} else {
return gen_cmp(OR_MACPL, 6, BPF_H, (bpf_int32)proto);
}
}
}
static struct block *
gen_hostop(addr, mask, dir, proto, src_off, dst_off)
bpf_u_int32 addr;
bpf_u_int32 mask;
int dir, proto;
u_int src_off, dst_off;
{
struct block *b0, *b1;
u_int offset;
switch (dir) {
case Q_SRC:
offset = src_off;
break;
case Q_DST:
offset = dst_off;
break;
case Q_AND:
b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
gen_and(b0, b1);
return b1;
case Q_OR:
case Q_DEFAULT:
b0 = gen_hostop(addr, mask, Q_SRC, proto, src_off, dst_off);
b1 = gen_hostop(addr, mask, Q_DST, proto, src_off, dst_off);
gen_or(b0, b1);
return b1;
default:
abort();
}
b0 = gen_linktype(proto);
b1 = gen_mcmp(OR_NET, offset, BPF_W, (bpf_int32)addr, mask);
gen_and(b0, b1);
return b1;
}
#ifdef INET6
static struct block *
gen_hostop6(addr, mask, dir, proto, src_off, dst_off)
struct in6_addr *addr;
struct in6_addr *mask;
int dir, proto;
u_int src_off, dst_off;
{
struct block *b0, *b1;
u_int offset;
u_int32_t *a, *m;
switch (dir) {
case Q_SRC:
offset = src_off;
break;
case Q_DST:
offset = dst_off;
break;
case Q_AND:
b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
gen_and(b0, b1);
return b1;
case Q_OR:
case Q_DEFAULT:
b0 = gen_hostop6(addr, mask, Q_SRC, proto, src_off, dst_off);
b1 = gen_hostop6(addr, mask, Q_DST, proto, src_off, dst_off);
gen_or(b0, b1);
return b1;
default:
abort();
}
a = (u_int32_t *)addr;
m = (u_int32_t *)mask;
b1 = gen_mcmp(OR_NET, offset + 12, BPF_W, ntohl(a[3]), ntohl(m[3]));
b0 = gen_mcmp(OR_NET, offset + 8, BPF_W, ntohl(a[2]), ntohl(m[2]));
gen_and(b0, b1);
b0 = gen_mcmp(OR_NET, offset + 4, BPF_W, ntohl(a[1]), ntohl(m[1]));
gen_and(b0, b1);
b0 = gen_mcmp(OR_NET, offset + 0, BPF_W, ntohl(a[0]), ntohl(m[0]));
gen_and(b0, b1);
b0 = gen_linktype(proto);
gen_and(b0, b1);
return b1;
}
#endif
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(OR_LINK, off_mac + 6, 6, eaddr);
case Q_DST:
return gen_bcmp(OR_LINK, 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();
}
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(OR_LINK, 6 + 1 + pcap_fddipad, 6, eaddr);
#else
return gen_bcmp(OR_LINK, 6 + 1, 6, eaddr);
#endif
case Q_DST:
#ifdef PCAP_FDDIPAD
return gen_bcmp(OR_LINK, 0 + 1 + pcap_fddipad, 6, eaddr);
#else
return gen_bcmp(OR_LINK, 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();
}
static struct block *
gen_thostop(eaddr, dir)
register const u_char *eaddr;
register int dir;
{
register struct block *b0, *b1;
switch (dir) {
case Q_SRC:
return gen_bcmp(OR_LINK, 8, 6, eaddr);
case Q_DST:
return gen_bcmp(OR_LINK, 2, 6, eaddr);
case Q_AND:
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_thostop(eaddr, Q_SRC);
b1 = gen_thostop(eaddr, Q_DST);
gen_or(b0, b1);
return b1;
}
abort();
}
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;
#ifdef ENABLE_WLAN_FILTERING_PATCH
no_optimize = 1;
#endif
switch (dir) {
case Q_SRC:
s = gen_load_a(OR_LINK, 1, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x01;
b1->stmts = s;
b0 = gen_bcmp(OR_LINK, 24, 6, eaddr);
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x01;
b2->stmts = s;
gen_not(b2);
b1 = gen_bcmp(OR_LINK, 16, 6, eaddr);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 1, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x02;
b1->stmts = s;
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x02;
b2->stmts = s;
gen_not(b2);
b1 = gen_bcmp(OR_LINK, 10, 6, eaddr);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x08;
b1->stmts = s;
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x08;
b2->stmts = s;
gen_not(b2);
b1 = gen_bcmp(OR_LINK, 10, 6, eaddr);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x04;
b1->stmts = s;
gen_not(b1);
gen_and(b1, b0);
return b0;
case Q_DST:
s = gen_load_a(OR_LINK, 1, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x01;
b1->stmts = s;
b0 = gen_bcmp(OR_LINK, 16, 6, eaddr);
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x01;
b2->stmts = s;
gen_not(b2);
b1 = gen_bcmp(OR_LINK, 4, 6, eaddr);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x08;
b1->stmts = s;
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x08;
b2->stmts = s;
gen_not(b2);
b1 = gen_bcmp(OR_LINK, 4, 6, eaddr);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x04;
b1->stmts = s;
gen_not(b1);
gen_and(b1, b0);
return b0;
case Q_ADDR1:
return (gen_bcmp(OR_LINK, 4, 6, eaddr));
case Q_ADDR2:
b0 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_TYPE_CTL,
IEEE80211_FC0_TYPE_MASK);
gen_not(b0);
b1 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_SUBTYPE_CTS,
IEEE80211_FC0_SUBTYPE_MASK);
gen_not(b1);
b2 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_SUBTYPE_ACK,
IEEE80211_FC0_SUBTYPE_MASK);
gen_not(b2);
gen_and(b1, b2);
gen_or(b0, b2);
b1 = gen_bcmp(OR_LINK, 10, 6, eaddr);
gen_and(b2, b1);
return b1;
case Q_ADDR3:
b0 = gen_mcmp(OR_LINK, 0, BPF_B, IEEE80211_FC0_TYPE_CTL,
IEEE80211_FC0_TYPE_MASK);
gen_not(b0);
b1 = gen_bcmp(OR_LINK, 16, 6, eaddr);
gen_and(b0, b1);
return b1;
case Q_ADDR4:
b0 = gen_mcmp(OR_LINK, 1, BPF_B,
IEEE80211_FC1_DIR_DSTODS, IEEE80211_FC1_DIR_MASK);
b1 = gen_bcmp(OR_LINK, 24, 6, eaddr);
gen_and(b0, b1);
return b1;
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();
}
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(OR_LINK, 10, 6, eaddr);
case Q_DST:
return gen_bcmp(OR_LINK, 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();
}
static struct block *
gen_dnhostop(addr, dir)
bpf_u_int32 addr;
int dir;
{
struct block *b0, *b1, *b2, *tmp;
u_int offset_lh;
u_int offset_sh;
switch (dir) {
case Q_DST:
offset_sh = 1;
offset_lh = 7;
break;
case Q_SRC:
offset_sh = 3;
offset_lh = 15;
break;
case Q_AND:
b0 = gen_dnhostop(addr, Q_SRC);
b1 = gen_dnhostop(addr, Q_DST);
gen_and(b0, b1);
return b1;
case Q_OR:
case Q_DEFAULT:
b0 = gen_dnhostop(addr, Q_SRC);
b1 = gen_dnhostop(addr, Q_DST);
gen_or(b0, b1);
return b1;
case Q_ISO:
bpf_error("ISO host filtering not implemented");
default:
abort();
}
b0 = gen_linktype(ETHERTYPE_DN);
tmp = gen_mcmp(OR_NET, 2, BPF_H,
(bpf_int32)ntohs(0x0681), (bpf_int32)ntohs(0x07FF));
b1 = gen_cmp(OR_NET, 2 + 1 + offset_lh,
BPF_H, (bpf_int32)ntohs((u_short)addr));
gen_and(tmp, b1);
tmp = gen_mcmp(OR_NET, 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7);
b2 = gen_cmp(OR_NET, 2 + offset_lh, BPF_H, (bpf_int32)ntohs((u_short)addr));
gen_and(tmp, b2);
gen_or(b2, b1);
tmp = gen_mcmp(OR_NET, 2, BPF_H,
(bpf_int32)ntohs(0x0281), (bpf_int32)ntohs(0x07FF));
b2 = gen_cmp(OR_NET, 2 + 1 + offset_sh, BPF_H, (bpf_int32)ntohs((u_short)addr));
gen_and(tmp, b2);
gen_or(b2, b1);
tmp = gen_mcmp(OR_NET, 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7);
b2 = gen_cmp(OR_NET, 2 + offset_sh, BPF_H, (bpf_int32)ntohs((u_short)addr));
gen_and(tmp, b2);
gen_or(b2, b1);
gen_and(b0, b1);
return b1;
}
static struct block *
gen_mpls_linktype(proto)
int proto;
{
struct block *b0, *b1;
switch (proto) {
case Q_IP:
b0 = gen_mcmp(OR_NET, -2, BPF_B, 0x01, 0x01);
b1 = gen_mcmp(OR_NET, 0, BPF_B, 0x40, 0xf0);
gen_and(b0, b1);
return b1;
case Q_IPV6:
b0 = gen_mcmp(OR_NET, -2, BPF_B, 0x01, 0x01);
b1 = gen_mcmp(OR_NET, 0, BPF_B, 0x60, 0xf0);
gen_and(b0, b1);
return b1;
default:
abort();
}
}
static struct block *
gen_host(addr, mask, proto, dir, type)
bpf_u_int32 addr;
bpf_u_int32 mask;
int proto;
int dir;
int type;
{
struct block *b0, *b1;
const char *typestr;
if (type == Q_NET)
typestr = "net";
else
typestr = "host";
switch (proto) {
case Q_DEFAULT:
b0 = gen_host(addr, mask, Q_IP, dir, type);
if (label_stack_depth == 0) {
b1 = gen_host(addr, mask, Q_ARP, dir, type);
gen_or(b0, b1);
b0 = gen_host(addr, mask, Q_RARP, dir, type);
gen_or(b1, b0);
}
return b0;
case Q_IP:
return gen_hostop(addr, mask, dir, ETHERTYPE_IP, 12, 16);
case Q_RARP:
return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP, 14, 24);
case Q_ARP:
return gen_hostop(addr, mask, dir, ETHERTYPE_ARP, 14, 24);
case Q_TCP:
bpf_error("'tcp' modifier applied to %s", typestr);
case Q_SCTP:
bpf_error("'sctp' modifier applied to %s", typestr);
case Q_UDP:
bpf_error("'udp' modifier applied to %s", typestr);
case Q_ICMP:
bpf_error("'icmp' modifier applied to %s", typestr);
case Q_IGMP:
bpf_error("'igmp' modifier applied to %s", typestr);
case Q_IGRP:
bpf_error("'igrp' modifier applied to %s", typestr);
case Q_PIM:
bpf_error("'pim' modifier applied to %s", typestr);
case Q_VRRP:
bpf_error("'vrrp' modifier applied to %s", typestr);
case Q_ATALK:
bpf_error("ATALK host filtering not implemented");
case Q_AARP:
bpf_error("AARP host filtering not implemented");
case Q_DECNET:
return gen_dnhostop(addr, dir);
case Q_SCA:
bpf_error("SCA host filtering not implemented");
case Q_LAT:
bpf_error("LAT host filtering not implemented");
case Q_MOPDL:
bpf_error("MOPDL host filtering not implemented");
case Q_MOPRC:
bpf_error("MOPRC host filtering not implemented");
#ifdef INET6
case Q_IPV6:
bpf_error("'ip6' modifier applied to ip host");
case Q_ICMPV6:
bpf_error("'icmp6' modifier applied to %s", typestr);
#endif
case Q_AH:
bpf_error("'ah' modifier applied to %s", typestr);
case Q_ESP:
bpf_error("'esp' modifier applied to %s", typestr);
case Q_ISO:
bpf_error("ISO host filtering not implemented");
case Q_ESIS:
bpf_error("'esis' modifier applied to %s", typestr);
case Q_ISIS:
bpf_error("'isis' modifier applied to %s", typestr);
case Q_CLNP:
bpf_error("'clnp' modifier applied to %s", typestr);
case Q_STP:
bpf_error("'stp' modifier applied to %s", typestr);
case Q_IPX:
bpf_error("IPX host filtering not implemented");
case Q_NETBEUI:
bpf_error("'netbeui' modifier applied to %s", typestr);
case Q_RADIO:
bpf_error("'radio' modifier applied to %s", typestr);
default:
abort();
}
}
#ifdef INET6
static struct block *
gen_host6(addr, mask, proto, dir, type)
struct in6_addr *addr;
struct in6_addr *mask;
int proto;
int dir;
int type;
{
const char *typestr;
if (type == Q_NET)
typestr = "net";
else
typestr = "host";
switch (proto) {
case Q_DEFAULT:
return gen_host6(addr, mask, Q_IPV6, dir, type);
case Q_IP:
bpf_error("'ip' modifier applied to ip6 %s", typestr);
case Q_RARP:
bpf_error("'rarp' modifier applied to ip6 %s", typestr);
case Q_ARP:
bpf_error("'arp' modifier applied to ip6 %s", typestr);
case Q_SCTP:
bpf_error("'sctp' modifier applied to %s", typestr);
case Q_TCP:
bpf_error("'tcp' modifier applied to %s", typestr);
case Q_UDP:
bpf_error("'udp' modifier applied to %s", typestr);
case Q_ICMP:
bpf_error("'icmp' modifier applied to %s", typestr);
case Q_IGMP:
bpf_error("'igmp' modifier applied to %s", typestr);
case Q_IGRP:
bpf_error("'igrp' modifier applied to %s", typestr);
case Q_PIM:
bpf_error("'pim' modifier applied to %s", typestr);
case Q_VRRP:
bpf_error("'vrrp' modifier applied to %s", typestr);
case Q_ATALK:
bpf_error("ATALK host filtering not implemented");
case Q_AARP:
bpf_error("AARP host filtering not implemented");
case Q_DECNET:
bpf_error("'decnet' modifier applied to ip6 %s", typestr);
case Q_SCA:
bpf_error("SCA host filtering not implemented");
case Q_LAT:
bpf_error("LAT host filtering not implemented");
case Q_MOPDL:
bpf_error("MOPDL host filtering not implemented");
case Q_MOPRC:
bpf_error("MOPRC host filtering not implemented");
case Q_IPV6:
return gen_hostop6(addr, mask, dir, ETHERTYPE_IPV6, 8, 24);
case Q_ICMPV6:
bpf_error("'icmp6' modifier applied to %s", typestr);
case Q_AH:
bpf_error("'ah' modifier applied to %s", typestr);
case Q_ESP:
bpf_error("'esp' modifier applied to %s", typestr);
case Q_ISO:
bpf_error("ISO host filtering not implemented");
case Q_ESIS:
bpf_error("'esis' modifier applied to %s", typestr);
case Q_ISIS:
bpf_error("'isis' modifier applied to %s", typestr);
case Q_CLNP:
bpf_error("'clnp' modifier applied to %s", typestr);
case Q_STP:
bpf_error("'stp' modifier applied to %s", typestr);
case Q_IPX:
bpf_error("IPX host filtering not implemented");
case Q_NETBEUI:
bpf_error("'netbeui' modifier applied to %s", typestr);
case Q_RADIO:
bpf_error("'radio' modifier applied to %s", typestr);
default:
abort();
}
}
#endif
#ifndef INET6
static struct block *
gen_gateway(eaddr, alist, proto, dir)
const u_char *eaddr;
bpf_u_int32 **alist;
int proto;
int dir;
{
struct block *b0, *b1, *tmp;
if (dir != 0)
bpf_error("direction applied to 'gateway'");
switch (proto) {
case Q_DEFAULT:
case Q_IP:
case Q_ARP:
case Q_RARP:
switch (linktype) {
case DLT_EN10MB:
b0 = gen_ehostop(eaddr, Q_OR);
break;
case DLT_FDDI:
b0 = gen_fhostop(eaddr, Q_OR);
break;
case DLT_IEEE802:
b0 = gen_thostop(eaddr, Q_OR);
break;
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
b0 = gen_wlanhostop(eaddr, Q_OR);
break;
case DLT_SUNATM:
if (is_lane) {
b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS,
BPF_H, 0xFF00);
gen_not(b1);
b0 = gen_ehostop(eaddr, Q_OR);
gen_and(b1, b0);
}
break;
case DLT_IP_OVER_FC:
b0 = gen_ipfchostop(eaddr, Q_OR);
break;
default:
bpf_error(
"'gateway' supported only on ethernet/FDDI/token ring/802.11/Fibre Channel");
}
b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR, Q_HOST);
while (*alist) {
tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR,
Q_HOST);
gen_or(b1, tmp);
b1 = tmp;
}
gen_not(b1);
gen_and(b0, b1);
return b1;
}
bpf_error("illegal modifier of 'gateway'");
}
#endif
struct block *
gen_proto_abbrev(proto)
int proto;
{
struct block *b0;
struct block *b1;
switch (proto) {
case Q_SCTP:
b1 = gen_proto(IPPROTO_SCTP, Q_IP, Q_DEFAULT);
#ifdef INET6
b0 = gen_proto(IPPROTO_SCTP, Q_IPV6, Q_DEFAULT);
gen_or(b0, b1);
#endif
break;
case Q_TCP:
b1 = gen_proto(IPPROTO_TCP, Q_IP, Q_DEFAULT);
#ifdef INET6
b0 = gen_proto(IPPROTO_TCP, Q_IPV6, Q_DEFAULT);
gen_or(b0, b1);
#endif
break;
case Q_UDP:
b1 = gen_proto(IPPROTO_UDP, Q_IP, Q_DEFAULT);
#ifdef INET6
b0 = gen_proto(IPPROTO_UDP, Q_IPV6, Q_DEFAULT);
gen_or(b0, b1);
#endif
break;
case Q_ICMP:
b1 = gen_proto(IPPROTO_ICMP, Q_IP, Q_DEFAULT);
break;
#ifndef IPPROTO_IGMP
#define IPPROTO_IGMP 2
#endif
case Q_IGMP:
b1 = gen_proto(IPPROTO_IGMP, Q_IP, Q_DEFAULT);
break;
#ifndef IPPROTO_IGRP
#define IPPROTO_IGRP 9
#endif
case Q_IGRP:
b1 = gen_proto(IPPROTO_IGRP, Q_IP, Q_DEFAULT);
break;
#ifndef IPPROTO_PIM
#define IPPROTO_PIM 103
#endif
case Q_PIM:
b1 = gen_proto(IPPROTO_PIM, Q_IP, Q_DEFAULT);
#ifdef INET6
b0 = gen_proto(IPPROTO_PIM, Q_IPV6, Q_DEFAULT);
gen_or(b0, b1);
#endif
break;
#ifndef IPPROTO_VRRP
#define IPPROTO_VRRP 112
#endif
case Q_VRRP:
b1 = gen_proto(IPPROTO_VRRP, Q_IP, Q_DEFAULT);
break;
case Q_IP:
b1 = gen_linktype(ETHERTYPE_IP);
break;
case Q_ARP:
b1 = gen_linktype(ETHERTYPE_ARP);
break;
case Q_RARP:
b1 = gen_linktype(ETHERTYPE_REVARP);
break;
case Q_LINK:
bpf_error("link layer applied in wrong context");
case Q_ATALK:
b1 = gen_linktype(ETHERTYPE_ATALK);
break;
case Q_AARP:
b1 = gen_linktype(ETHERTYPE_AARP);
break;
case Q_DECNET:
b1 = gen_linktype(ETHERTYPE_DN);
break;
case Q_SCA:
b1 = gen_linktype(ETHERTYPE_SCA);
break;
case Q_LAT:
b1 = gen_linktype(ETHERTYPE_LAT);
break;
case Q_MOPDL:
b1 = gen_linktype(ETHERTYPE_MOPDL);
break;
case Q_MOPRC:
b1 = gen_linktype(ETHERTYPE_MOPRC);
break;
#ifdef INET6
case Q_IPV6:
b1 = gen_linktype(ETHERTYPE_IPV6);
break;
#ifndef IPPROTO_ICMPV6
#define IPPROTO_ICMPV6 58
#endif
case Q_ICMPV6:
b1 = gen_proto(IPPROTO_ICMPV6, Q_IPV6, Q_DEFAULT);
break;
#endif
#ifndef IPPROTO_AH
#define IPPROTO_AH 51
#endif
case Q_AH:
b1 = gen_proto(IPPROTO_AH, Q_IP, Q_DEFAULT);
#ifdef INET6
b0 = gen_proto(IPPROTO_AH, Q_IPV6, Q_DEFAULT);
gen_or(b0, b1);
#endif
break;
#ifndef IPPROTO_ESP
#define IPPROTO_ESP 50
#endif
case Q_ESP:
b1 = gen_proto(IPPROTO_ESP, Q_IP, Q_DEFAULT);
#ifdef INET6
b0 = gen_proto(IPPROTO_ESP, Q_IPV6, Q_DEFAULT);
gen_or(b0, b1);
#endif
break;
case Q_ISO:
b1 = gen_linktype(LLCSAP_ISONS);
break;
case Q_ESIS:
b1 = gen_proto(ISO9542_ESIS, Q_ISO, Q_DEFAULT);
break;
case Q_ISIS:
b1 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
break;
case Q_ISIS_L1:
b0 = gen_proto(ISIS_L1_LAN_IIH, Q_ISIS, Q_DEFAULT);
b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT);
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:
b0 = gen_proto(ISIS_L2_LAN_IIH, Q_ISIS, Q_DEFAULT);
b1 = gen_proto(ISIS_PTP_IIH, Q_ISIS, Q_DEFAULT);
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:
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);
break;
case Q_STP:
b1 = gen_linktype(LLCSAP_8021D);
break;
case Q_IPX:
b1 = gen_linktype(LLCSAP_IPX);
break;
case Q_NETBEUI:
b1 = gen_linktype(LLCSAP_NETBEUI);
break;
case Q_RADIO:
bpf_error("'radio' is not a valid protocol type");
default:
abort();
}
return b1;
}
static struct block *
gen_ipfrag()
{
struct slist *s;
struct block *b;
s = gen_load_a(OR_NET, 6, BPF_H);
b = new_block(JMP(BPF_JSET));
b->s.k = 0x1fff;
b->stmts = s;
gen_not(b);
return b;
}
static struct block *
gen_portatom(off, v)
int off;
bpf_int32 v;
{
return gen_cmp(OR_TRAN_IPV4, off, BPF_H, v);
}
#ifdef INET6
static struct block *
gen_portatom6(off, v)
int off;
bpf_int32 v;
{
return gen_cmp(OR_TRAN_IPV6, off, BPF_H, v);
}
#endif/*INET6*/
struct block *
gen_portop(port, proto, dir)
int port, proto, dir;
{
struct block *b0, *b1, *tmp;
tmp = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)proto);
b0 = gen_ipfrag();
gen_and(tmp, b0);
switch (dir) {
case Q_SRC:
b1 = gen_portatom(0, (bpf_int32)port);
break;
case Q_DST:
b1 = gen_portatom(2, (bpf_int32)port);
break;
case Q_OR:
case Q_DEFAULT:
tmp = gen_portatom(0, (bpf_int32)port);
b1 = gen_portatom(2, (bpf_int32)port);
gen_or(tmp, b1);
break;
case Q_AND:
tmp = gen_portatom(0, (bpf_int32)port);
b1 = gen_portatom(2, (bpf_int32)port);
gen_and(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
static struct block *
gen_port(port, ip_proto, dir)
int port;
int ip_proto;
int dir;
{
struct block *b0, *b1, *tmp;
b0 = gen_linktype(ETHERTYPE_IP);
switch (ip_proto) {
case IPPROTO_UDP:
case IPPROTO_TCP:
case IPPROTO_SCTP:
b1 = gen_portop(port, ip_proto, dir);
break;
case PROTO_UNDEF:
tmp = gen_portop(port, IPPROTO_TCP, dir);
b1 = gen_portop(port, IPPROTO_UDP, dir);
gen_or(tmp, b1);
tmp = gen_portop(port, IPPROTO_SCTP, dir);
gen_or(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
#ifdef INET6
struct block *
gen_portop6(port, proto, dir)
int port, proto, dir;
{
struct block *b0, *b1, *tmp;
b0 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)proto);
switch (dir) {
case Q_SRC:
b1 = gen_portatom6(0, (bpf_int32)port);
break;
case Q_DST:
b1 = gen_portatom6(2, (bpf_int32)port);
break;
case Q_OR:
case Q_DEFAULT:
tmp = gen_portatom6(0, (bpf_int32)port);
b1 = gen_portatom6(2, (bpf_int32)port);
gen_or(tmp, b1);
break;
case Q_AND:
tmp = gen_portatom6(0, (bpf_int32)port);
b1 = gen_portatom6(2, (bpf_int32)port);
gen_and(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
static struct block *
gen_port6(port, ip_proto, dir)
int port;
int ip_proto;
int dir;
{
struct block *b0, *b1, *tmp;
b0 = gen_linktype(ETHERTYPE_IPV6);
switch (ip_proto) {
case IPPROTO_UDP:
case IPPROTO_TCP:
case IPPROTO_SCTP:
b1 = gen_portop6(port, ip_proto, dir);
break;
case PROTO_UNDEF:
tmp = gen_portop6(port, IPPROTO_TCP, dir);
b1 = gen_portop6(port, IPPROTO_UDP, dir);
gen_or(tmp, b1);
tmp = gen_portop6(port, IPPROTO_SCTP, dir);
gen_or(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
#endif
static struct block *
gen_portrangeatom(off, v1, v2)
int off;
bpf_int32 v1, v2;
{
struct block *b1, *b2;
if (v1 > v2) {
bpf_int32 vtemp;
vtemp = v1;
v1 = v2;
v2 = vtemp;
}
b1 = gen_cmp_ge(OR_TRAN_IPV4, off, BPF_H, v1);
b2 = gen_cmp_le(OR_TRAN_IPV4, off, BPF_H, v2);
gen_and(b1, b2);
return b2;
}
struct block *
gen_portrangeop(port1, port2, proto, dir)
int port1, port2;
int proto;
int dir;
{
struct block *b0, *b1, *tmp;
tmp = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)proto);
b0 = gen_ipfrag();
gen_and(tmp, b0);
switch (dir) {
case Q_SRC:
b1 = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_DST:
b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_OR:
case Q_DEFAULT:
tmp = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2);
b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2);
gen_or(tmp, b1);
break;
case Q_AND:
tmp = gen_portrangeatom(0, (bpf_int32)port1, (bpf_int32)port2);
b1 = gen_portrangeatom(2, (bpf_int32)port1, (bpf_int32)port2);
gen_and(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
static struct block *
gen_portrange(port1, port2, ip_proto, dir)
int port1, port2;
int ip_proto;
int dir;
{
struct block *b0, *b1, *tmp;
b0 = gen_linktype(ETHERTYPE_IP);
switch (ip_proto) {
case IPPROTO_UDP:
case IPPROTO_TCP:
case IPPROTO_SCTP:
b1 = gen_portrangeop(port1, port2, ip_proto, dir);
break;
case PROTO_UNDEF:
tmp = gen_portrangeop(port1, port2, IPPROTO_TCP, dir);
b1 = gen_portrangeop(port1, port2, IPPROTO_UDP, dir);
gen_or(tmp, b1);
tmp = gen_portrangeop(port1, port2, IPPROTO_SCTP, dir);
gen_or(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
#ifdef INET6
static struct block *
gen_portrangeatom6(off, v1, v2)
int off;
bpf_int32 v1, v2;
{
struct block *b1, *b2;
if (v1 > v2) {
bpf_int32 vtemp;
vtemp = v1;
v1 = v2;
v2 = vtemp;
}
b1 = gen_cmp_ge(OR_TRAN_IPV6, off, BPF_H, v1);
b2 = gen_cmp_le(OR_TRAN_IPV6, off, BPF_H, v2);
gen_and(b1, b2);
return b2;
}
struct block *
gen_portrangeop6(port1, port2, proto, dir)
int port1, port2;
int proto;
int dir;
{
struct block *b0, *b1, *tmp;
b0 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)proto);
switch (dir) {
case Q_SRC:
b1 = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_DST:
b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2);
break;
case Q_OR:
case Q_DEFAULT:
tmp = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2);
b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2);
gen_or(tmp, b1);
break;
case Q_AND:
tmp = gen_portrangeatom6(0, (bpf_int32)port1, (bpf_int32)port2);
b1 = gen_portrangeatom6(2, (bpf_int32)port1, (bpf_int32)port2);
gen_and(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
static struct block *
gen_portrange6(port1, port2, ip_proto, dir)
int port1, port2;
int ip_proto;
int dir;
{
struct block *b0, *b1, *tmp;
b0 = gen_linktype(ETHERTYPE_IPV6);
switch (ip_proto) {
case IPPROTO_UDP:
case IPPROTO_TCP:
case IPPROTO_SCTP:
b1 = gen_portrangeop6(port1, port2, ip_proto, dir);
break;
case PROTO_UNDEF:
tmp = gen_portrangeop6(port1, port2, IPPROTO_TCP, dir);
b1 = gen_portrangeop6(port1, port2, IPPROTO_UDP, dir);
gen_or(tmp, b1);
tmp = gen_portrangeop6(port1, port2, IPPROTO_SCTP, dir);
gen_or(tmp, b1);
break;
default:
abort();
}
gen_and(b0, b1);
return b1;
}
#endif
static int
lookup_proto(name, proto)
register const char *name;
register int proto;
{
register int v;
switch (proto) {
case Q_DEFAULT:
case Q_IP:
case Q_IPV6:
v = pcap_nametoproto(name);
if (v == PROTO_UNDEF)
bpf_error("unknown ip proto '%s'", name);
break;
case Q_LINK:
v = pcap_nametoeproto(name);
if (v == PROTO_UNDEF) {
v = pcap_nametollc(name);
if (v == PROTO_UNDEF)
bpf_error("unknown ether proto '%s'", name);
}
break;
case Q_ISO:
if (strcmp(name, "esis") == 0)
v = ISO9542_ESIS;
else if (strcmp(name, "isis") == 0)
v = ISO10589_ISIS;
else if (strcmp(name, "clnp") == 0)
v = ISO8473_CLNP;
else
bpf_error("unknown osi proto '%s'", name);
break;
default:
v = PROTO_UNDEF;
break;
}
return v;
}
#if 0
struct stmt *
gen_joinsp(s, n)
struct stmt **s;
int n;
{
return NULL;
}
#endif
static struct block *
gen_protochain(v, proto, dir)
int v;
int proto;
int dir;
{
#ifdef NO_PROTOCHAIN
return gen_proto(v, proto, dir);
#else
struct block *b0, *b;
struct slist *s[100];
int fix2, fix3, fix4, fix5;
int ahcheck, again, end;
int i, max;
int reg2 = alloc_reg();
memset(s, 0, sizeof(s));
fix2 = fix3 = fix4 = fix5 = 0;
switch (proto) {
case Q_IP:
case Q_IPV6:
break;
case Q_DEFAULT:
b0 = gen_protochain(v, Q_IP, dir);
b = gen_protochain(v, Q_IPV6, dir);
gen_or(b0, b);
return b;
default:
bpf_error("bad protocol applied for 'protochain'");
}
switch (linktype) {
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
bpf_error("'protochain' not supported with 802.11");
}
no_optimize = 1;
i = 0;
s[i] = new_stmt(0);
i++;
switch (proto) {
case Q_IP:
b0 = gen_linktype(ETHERTYPE_IP);
s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
s[i]->s.k = off_macpl + off_nl + 9;
i++;
s[i] = new_stmt(BPF_LDX|BPF_MSH|BPF_B);
s[i]->s.k = off_macpl + off_nl;
i++;
break;
#ifdef INET6
case Q_IPV6:
b0 = gen_linktype(ETHERTYPE_IPV6);
s[i] = new_stmt(BPF_LD|BPF_ABS|BPF_B);
s[i]->s.k = off_macpl + off_nl + 6;
i++;
s[i] = new_stmt(BPF_LDX|BPF_IMM);
s[i]->s.k = 40;
i++;
break;
#endif
default:
bpf_error("unsupported proto to gen_protochain");
}
again = i;
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.k = v;
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
fix5 = i;
i++;
#ifndef IPPROTO_NONE
#define IPPROTO_NONE 59
#endif
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
s[i]->s.k = IPPROTO_NONE;
s[fix5]->s.jf = s[i];
fix2 = i;
i++;
#ifdef INET6
if (proto == Q_IPV6) {
int v6start, v6end, v6advance, j;
v6start = i;
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
s[i]->s.k = IPPROTO_HOPOPTS;
s[fix2]->s.jf = s[i];
i++;
s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
s[i]->s.k = IPPROTO_DSTOPTS;
i++;
s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
s[i]->s.k = IPPROTO_ROUTING;
i++;
s[i - 1]->s.jf = s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
s[i]->s.k = IPPROTO_FRAGMENT;
fix3 = i;
v6end = i;
i++;
v6advance = i;
s[i] = new_stmt(BPF_MISC|BPF_TXA);
i++;
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
s[i]->s.k = off_macpl + off_nl;
i++;
s[i] = new_stmt(BPF_ST);
s[i]->s.k = reg2;
i++;
s[i] = new_stmt(BPF_MISC|BPF_TXA);
i++;
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s[i]->s.k = 1;
i++;
s[i] = new_stmt(BPF_MISC|BPF_TAX);
i++;
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
s[i]->s.k = off_macpl + off_nl;
i++;
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s[i]->s.k = 1;
i++;
s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
s[i]->s.k = 8;
i++;
s[i] = new_stmt(BPF_MISC|BPF_TAX);
i++;
s[i] = new_stmt(BPF_LD|BPF_MEM);
s[i]->s.k = reg2;
i++;
s[i] = new_stmt(BPF_JMP|BPF_JA);
s[i]->s.k = again - i - 1;
s[i - 1]->s.jf = s[i];
i++;
for (j = v6start; j <= v6end; j++)
s[j]->s.jt = s[v6advance];
} else
#endif
{
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s[i]->s.k = 0;
s[fix2]->s.jf = s[i];
i++;
}
ahcheck = i;
s[i] = new_stmt(BPF_JMP|BPF_JEQ|BPF_K);
s[i]->s.jt = NULL;
s[i]->s.jf = NULL;
s[i]->s.k = IPPROTO_AH;
if (fix3)
s[fix3]->s.jf = s[ahcheck];
fix4 = i;
i++;
s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
i++;
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
s[i]->s.k = off_macpl + off_nl;
i++;
s[i] = new_stmt(BPF_ST);
s[i]->s.k = reg2;
i++;
s[i - 1]->s.jt = s[i] = new_stmt(BPF_MISC|BPF_TXA);
i++;
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s[i]->s.k = 1;
i++;
s[i] = new_stmt(BPF_MISC|BPF_TAX);
i++;
s[i] = new_stmt(BPF_LD|BPF_IND|BPF_B);
s[i]->s.k = off_macpl + off_nl;
i++;
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s[i]->s.k = 2;
i++;
s[i] = new_stmt(BPF_ALU|BPF_MUL|BPF_K);
s[i]->s.k = 4;
i++;
s[i] = new_stmt(BPF_MISC|BPF_TAX);
i++;
s[i] = new_stmt(BPF_LD|BPF_MEM);
s[i]->s.k = reg2;
i++;
s[i] = new_stmt(BPF_JMP|BPF_JA);
s[i]->s.k = again - i - 1;
i++;
end = i;
s[i] = new_stmt(BPF_ALU|BPF_ADD|BPF_K);
s[i]->s.k = 0;
s[fix2]->s.jt = s[end];
s[fix4]->s.jf = s[end];
s[fix5]->s.jt = s[end];
i++;
max = i;
for (i = 0; i < max - 1; i++)
s[i]->next = s[i + 1];
s[max - 1]->next = NULL;
b = new_block(JMP(BPF_JEQ));
b->stmts = s[1];
b->s.k = v;
free_reg(reg2);
gen_and(b0, b);
return b;
#endif
}
static struct block *
gen_check_802_11_data_frame()
{
struct slist *s;
struct block *b0, *b1;
s = gen_load_a(OR_LINK, 0, BPF_B);
b0 = new_block(JMP(BPF_JSET));
b0->s.k = 0x08;
b0->stmts = s;
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x04;
b1->stmts = s;
gen_not(b1);
gen_and(b1, b0);
return b0;
}
static struct block *
gen_proto(v, proto, dir)
int v;
int proto;
int dir;
{
struct block *b0, *b1;
if (dir != Q_DEFAULT)
bpf_error("direction applied to 'proto'");
switch (proto) {
case Q_DEFAULT:
#ifdef INET6
b0 = gen_proto(v, Q_IP, dir);
b1 = gen_proto(v, Q_IPV6, dir);
gen_or(b0, b1);
return b1;
#else
#endif
case Q_IP:
b0 = gen_linktype(ETHERTYPE_IP);
#ifndef CHASE_CHAIN
b1 = gen_cmp(OR_NET, 9, BPF_B, (bpf_int32)v);
#else
b1 = gen_protochain(v, Q_IP);
#endif
gen_and(b0, b1);
return b1;
case Q_ISO:
switch (linktype) {
case DLT_FRELAY:
return gen_cmp(OR_LINK, 2, BPF_H, (0x03<<8) | v);
break;
case DLT_C_HDLC:
b0 = gen_linktype(LLCSAP_ISONS<<8 | LLCSAP_ISONS);
b1 = gen_cmp(OR_NET_NOSNAP, 1, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
default:
b0 = gen_linktype(LLCSAP_ISONS);
b1 = gen_cmp(OR_NET_NOSNAP, 0, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
}
case Q_ISIS:
b0 = gen_proto(ISO10589_ISIS, Q_ISO, Q_DEFAULT);
b1 = gen_cmp(OR_NET_NOSNAP, 4, BPF_B, (long)v);
gen_and(b0, b1);
return b1;
case Q_ARP:
bpf_error("arp does not encapsulate another protocol");
case Q_RARP:
bpf_error("rarp does not encapsulate another protocol");
case Q_ATALK:
bpf_error("atalk encapsulation is not specifiable");
case Q_DECNET:
bpf_error("decnet encapsulation is not specifiable");
case Q_SCA:
bpf_error("sca does not encapsulate another protocol");
case Q_LAT:
bpf_error("lat does not encapsulate another protocol");
case Q_MOPRC:
bpf_error("moprc does not encapsulate another protocol");
case Q_MOPDL:
bpf_error("mopdl does not encapsulate another protocol");
case Q_LINK:
return gen_linktype(v);
case Q_UDP:
bpf_error("'udp proto' is bogus");
case Q_TCP:
bpf_error("'tcp proto' is bogus");
case Q_SCTP:
bpf_error("'sctp proto' is bogus");
case Q_ICMP:
bpf_error("'icmp proto' is bogus");
case Q_IGMP:
bpf_error("'igmp proto' is bogus");
case Q_IGRP:
bpf_error("'igrp proto' is bogus");
case Q_PIM:
bpf_error("'pim proto' is bogus");
case Q_VRRP:
bpf_error("'vrrp proto' is bogus");
#ifdef INET6
case Q_IPV6:
b0 = gen_linktype(ETHERTYPE_IPV6);
#ifndef CHASE_CHAIN
b1 = gen_cmp(OR_NET, 6, BPF_B, (bpf_int32)v);
#else
b1 = gen_protochain(v, Q_IPV6);
#endif
gen_and(b0, b1);
return b1;
case Q_ICMPV6:
bpf_error("'icmp6 proto' is bogus");
#endif
case Q_AH:
bpf_error("'ah proto' is bogus");
case Q_ESP:
bpf_error("'ah proto' is bogus");
case Q_STP:
bpf_error("'stp proto' is bogus");
case Q_IPX:
bpf_error("'ipx proto' is bogus");
case Q_NETBEUI:
bpf_error("'netbeui proto' is bogus");
case Q_RADIO:
bpf_error("'radio proto' is bogus");
default:
abort();
}
}
struct block *
gen_scode(name, q)
register const char *name;
struct qual q;
{
int proto = q.proto;
int dir = q.dir;
int tproto;
u_char *eaddr;
bpf_u_int32 mask, addr;
#ifndef INET6
bpf_u_int32 **alist;
#else
int tproto6;
struct sockaddr_in *sin4;
struct sockaddr_in6 *sin6;
struct addrinfo *res, *res0;
struct in6_addr mask128;
#endif
struct block *b, *tmp;
int port, real_proto;
int port1, port2;
switch (q.addr) {
case Q_NET:
addr = pcap_nametonetaddr(name);
if (addr == 0)
bpf_error("unknown network '%s'", name);
mask = 0xffffffff;
while (addr && (addr & 0xff000000) == 0) {
addr <<= 8;
mask <<= 8;
}
return gen_host(addr, mask, proto, dir, q.addr);
case Q_DEFAULT:
case Q_HOST:
if (proto == Q_LINK) {
switch (linktype) {
case DLT_EN10MB:
eaddr = pcap_ether_hostton(name);
if (eaddr == NULL)
bpf_error(
"unknown ether host '%s'", name);
b = gen_ehostop(eaddr, dir);
free(eaddr);
return b;
case DLT_FDDI:
eaddr = pcap_ether_hostton(name);
if (eaddr == NULL)
bpf_error(
"unknown FDDI host '%s'", name);
b = gen_fhostop(eaddr, dir);
free(eaddr);
return b;
case DLT_IEEE802:
eaddr = pcap_ether_hostton(name);
if (eaddr == NULL)
bpf_error(
"unknown token ring host '%s'", name);
b = gen_thostop(eaddr, dir);
free(eaddr);
return b;
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
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;
tmp = gen_cmp(OR_LINK, 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);
return (gen_host(dn_addr, 0, proto, dir, q.addr));
} else {
#ifndef INET6
alist = pcap_nametoaddr(name);
if (alist == NULL || *alist == NULL)
bpf_error("unknown host '%s'", name);
tproto = proto;
if (off_linktype == (u_int)-1 && tproto == Q_DEFAULT)
tproto = Q_IP;
b = gen_host(**alist++, 0xffffffff, tproto, dir, q.addr);
while (*alist) {
tmp = gen_host(**alist++, 0xffffffff,
tproto, dir, q.addr);
gen_or(b, tmp);
b = tmp;
}
return b;
#else
memset(&mask128, 0xff, sizeof(mask128));
res0 = res = pcap_nametoaddrinfo(name);
if (res == NULL)
bpf_error("unknown host '%s'", name);
b = tmp = NULL;
tproto = tproto6 = proto;
if (off_linktype == -1 && tproto == Q_DEFAULT) {
tproto = Q_IP;
tproto6 = Q_IPV6;
}
for (res = res0; res; res = res->ai_next) {
switch (res->ai_family) {
case AF_INET:
if (tproto == Q_IPV6)
continue;
sin4 = (struct sockaddr_in *)
res->ai_addr;
tmp = gen_host(ntohl(sin4->sin_addr.s_addr),
0xffffffff, tproto, dir, q.addr);
break;
case AF_INET6:
if (tproto6 == Q_IP)
continue;
sin6 = (struct sockaddr_in6 *)
res->ai_addr;
tmp = gen_host6(&sin6->sin6_addr,
&mask128, tproto6, dir, q.addr);
break;
default:
continue;
}
if (b)
gen_or(b, tmp);
b = tmp;
}
freeaddrinfo(res0);
if (b == NULL) {
bpf_error("unknown host '%s'%s", name,
(proto == Q_DEFAULT)
? ""
: " for specified address family");
}
return b;
#endif
}
case Q_PORT:
if (proto != Q_DEFAULT &&
proto != Q_UDP && proto != Q_TCP && proto != Q_SCTP)
bpf_error("illegal qualifier of 'port'");
if (pcap_nametoport(name, &port, &real_proto) == 0)
bpf_error("unknown port '%s'", name);
if (proto == Q_UDP) {
if (real_proto == IPPROTO_TCP)
bpf_error("port '%s' is tcp", name);
else if (real_proto == IPPROTO_SCTP)
bpf_error("port '%s' is sctp", name);
else
real_proto = IPPROTO_UDP;
}
if (proto == Q_TCP) {
if (real_proto == IPPROTO_UDP)
bpf_error("port '%s' is udp", name);
else if (real_proto == IPPROTO_SCTP)
bpf_error("port '%s' is sctp", name);
else
real_proto = IPPROTO_TCP;
}
if (proto == Q_SCTP) {
if (real_proto == IPPROTO_UDP)
bpf_error("port '%s' is udp", name);
else if (real_proto == IPPROTO_TCP)
bpf_error("port '%s' is tcp", name);
else
real_proto = IPPROTO_SCTP;
}
#ifndef INET6
return gen_port(port, real_proto, dir);
#else
b = gen_port(port, real_proto, dir);
gen_or(gen_port6(port, real_proto, dir), b);
return b;
#endif
case Q_PORTRANGE:
if (proto != Q_DEFAULT &&
proto != Q_UDP && proto != Q_TCP && proto != Q_SCTP)
bpf_error("illegal qualifier of 'portrange'");
if (pcap_nametoportrange(name, &port1, &port2, &real_proto) == 0)
bpf_error("unknown port in range '%s'", name);
if (proto == Q_UDP) {
if (real_proto == IPPROTO_TCP)
bpf_error("port in range '%s' is tcp", name);
else if (real_proto == IPPROTO_SCTP)
bpf_error("port in range '%s' is sctp", name);
else
real_proto = IPPROTO_UDP;
}
if (proto == Q_TCP) {
if (real_proto == IPPROTO_UDP)
bpf_error("port in range '%s' is udp", name);
else if (real_proto == IPPROTO_SCTP)
bpf_error("port in range '%s' is sctp", name);
else
real_proto = IPPROTO_TCP;
}
if (proto == Q_SCTP) {
if (real_proto == IPPROTO_UDP)
bpf_error("port in range '%s' is udp", name);
else if (real_proto == IPPROTO_TCP)
bpf_error("port in range '%s' is tcp", name);
else
real_proto = IPPROTO_SCTP;
}
#ifndef INET6
return gen_portrange(port1, port2, real_proto, dir);
#else
b = gen_portrange(port1, port2, real_proto, dir);
gen_or(gen_portrange6(port1, port2, real_proto, dir), b);
return b;
#endif
case Q_GATEWAY:
#ifndef INET6
eaddr = pcap_ether_hostton(name);
if (eaddr == NULL)
bpf_error("unknown ether host: %s", name);
alist = pcap_nametoaddr(name);
if (alist == NULL || *alist == NULL)
bpf_error("unknown host '%s'", name);
b = gen_gateway(eaddr, alist, proto, dir);
free(eaddr);
return b;
#else
bpf_error("'gateway' not supported in this configuration");
#endif
case Q_PROTO:
real_proto = lookup_proto(name, proto);
if (real_proto >= 0)
return gen_proto(real_proto, proto, dir);
else
bpf_error("unknown protocol: %s", name);
case Q_PROTOCHAIN:
real_proto = lookup_proto(name, proto);
if (real_proto >= 0)
return gen_protochain(real_proto, proto, dir);
else
bpf_error("unknown protocol: %s", name);
case Q_UNDEF:
syntax();
}
abort();
}
struct block *
gen_mcode(s1, s2, masklen, q)
register const char *s1, *s2;
register int masklen;
struct qual q;
{
register int nlen, mlen;
bpf_u_int32 n, m;
nlen = __pcap_atoin(s1, &n);
n <<= 32 - nlen;
if (s2 != NULL) {
mlen = __pcap_atoin(s2, &m);
m <<= 32 - mlen;
if ((n & ~m) != 0)
bpf_error("non-network bits set in \"%s mask %s\"",
s1, s2);
} else {
if (masklen > 32)
bpf_error("mask length must be <= 32");
if (masklen == 0) {
m = 0;
} else
m = 0xffffffff << (32 - masklen);
if ((n & ~m) != 0)
bpf_error("non-network bits set in \"%s/%d\"",
s1, masklen);
}
switch (q.addr) {
case Q_NET:
return gen_host(n, m, q.proto, q.dir, q.addr);
default:
bpf_error("Mask syntax for networks only");
}
return NULL;
}
struct block *
gen_ncode(s, v, q)
register const char *s;
bpf_u_int32 v;
struct qual q;
{
bpf_u_int32 mask;
int proto = q.proto;
int dir = q.dir;
register int vlen;
if (s == NULL)
vlen = 32;
else if (q.proto == Q_DECNET)
vlen = __pcap_atodn(s, &v);
else
vlen = __pcap_atoin(s, &v);
switch (q.addr) {
case Q_DEFAULT:
case Q_HOST:
case Q_NET:
if (proto == Q_DECNET)
return gen_host(v, 0, proto, dir, q.addr);
else if (proto == Q_LINK) {
bpf_error("illegal link layer address");
} else {
mask = 0xffffffff;
if (s == NULL && q.addr == Q_NET) {
while (v && (v & 0xff000000) == 0) {
v <<= 8;
mask <<= 8;
}
} else {
v <<= 32 - vlen;
mask <<= 32 - vlen;
}
return gen_host(v, mask, proto, dir, q.addr);
}
case Q_PORT:
if (proto == Q_UDP)
proto = IPPROTO_UDP;
else if (proto == Q_TCP)
proto = IPPROTO_TCP;
else if (proto == Q_SCTP)
proto = IPPROTO_SCTP;
else if (proto == Q_DEFAULT)
proto = PROTO_UNDEF;
else
bpf_error("illegal qualifier of 'port'");
#ifndef INET6
return gen_port((int)v, proto, dir);
#else
{
struct block *b;
b = gen_port((int)v, proto, dir);
gen_or(gen_port6((int)v, proto, dir), b);
return b;
}
#endif
case Q_PORTRANGE:
if (proto == Q_UDP)
proto = IPPROTO_UDP;
else if (proto == Q_TCP)
proto = IPPROTO_TCP;
else if (proto == Q_SCTP)
proto = IPPROTO_SCTP;
else if (proto == Q_DEFAULT)
proto = PROTO_UNDEF;
else
bpf_error("illegal qualifier of 'portrange'");
#ifndef INET6
return gen_portrange((int)v, (int)v, proto, dir);
#else
{
struct block *b;
b = gen_portrange((int)v, (int)v, proto, dir);
gen_or(gen_portrange6((int)v, (int)v, proto, dir), b);
return b;
}
#endif
case Q_GATEWAY:
bpf_error("'gateway' requires a name");
case Q_PROTO:
return gen_proto((int)v, proto, dir);
case Q_PROTOCHAIN:
return gen_protochain((int)v, proto, dir);
case Q_UNDEF:
syntax();
default:
abort();
}
}
#ifdef INET6
struct block *
gen_mcode6(s1, s2, masklen, q)
register const char *s1, *s2;
register int masklen;
struct qual q;
{
struct addrinfo *res;
struct in6_addr *addr;
struct in6_addr mask;
struct block *b;
u_int32_t *a, *m;
if (s2)
bpf_error("no mask %s supported", s2);
res = pcap_nametoaddrinfo(s1);
if (!res)
bpf_error("invalid ip6 address %s", s1);
if (res->ai_next)
bpf_error("%s resolved to multiple address", s1);
addr = &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr;
if (sizeof(mask) * 8 < masklen)
bpf_error("mask length must be <= %u", (unsigned int)(sizeof(mask) * 8));
memset(&mask, 0, sizeof(mask));
memset(&mask, 0xff, masklen / 8);
if (masklen % 8) {
mask.s6_addr[masklen / 8] =
(0xff << (8 - masklen % 8)) & 0xff;
}
a = (u_int32_t *)addr;
m = (u_int32_t *)&mask;
if ((a[0] & ~m[0]) || (a[1] & ~m[1])
|| (a[2] & ~m[2]) || (a[3] & ~m[3])) {
bpf_error("non-network bits set in \"%s/%d\"", s1, masklen);
}
switch (q.addr) {
case Q_DEFAULT:
case Q_HOST:
if (masklen != 128)
bpf_error("Mask syntax for networks only");
case Q_NET:
b = gen_host6(addr, &mask, q.proto, q.dir, q.addr);
freeaddrinfo(res);
return b;
default:
bpf_error("invalid qualifier against IPv6 address");
}
return NULL;
}
#endif
struct block *
gen_ecode(eaddr, q)
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) {
switch (linktype) {
case DLT_EN10MB:
return gen_ehostop(eaddr, (int)q.dir);
case DLT_FDDI:
return gen_fhostop(eaddr, (int)q.dir);
case DLT_IEEE802:
return gen_thostop(eaddr, (int)q.dir);
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
return gen_wlanhostop(eaddr, (int)q.dir);
case DLT_SUNATM:
if (is_lane) {
tmp = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS, BPF_H,
0xFF00);
gen_not(tmp);
b = gen_ehostop(eaddr, (int)q.dir);
gen_and(tmp, b);
return b;
}
break;
case DLT_IP_OVER_FC:
return gen_ipfchostop(eaddr, (int)q.dir);
default:
bpf_error("ethernet addresses supported only on ethernet/FDDI/token ring/802.11/ATM LANE/Fibre Channel");
break;
}
}
bpf_error("ethernet address used in non-ether expression");
return NULL;
}
void
sappend(s0, s1)
struct slist *s0, *s1;
{
while (s0->next)
s0 = s0->next;
s0->next = s1;
}
static struct slist *
xfer_to_x(a)
struct arth *a;
{
struct slist *s;
s = new_stmt(BPF_LDX|BPF_MEM);
s->s.k = a->regno;
return s;
}
static struct slist *
xfer_to_a(a)
struct arth *a;
{
struct slist *s;
s = new_stmt(BPF_LD|BPF_MEM);
s->s.k = a->regno;
return s;
}
struct arth *
gen_load(proto, inst, size)
int proto;
struct arth *inst;
int size;
{
struct slist *s, *tmp;
struct block *b;
int regno = alloc_reg();
free_reg(inst->regno);
switch (size) {
default:
bpf_error("data size must be 1, 2, or 4");
case 1:
size = BPF_B;
break;
case 2:
size = BPF_H;
break;
case 4:
size = BPF_W;
break;
}
switch (proto) {
default:
bpf_error("unsupported index operation");
case Q_RADIO:
if (linktype != DLT_IEEE802_11_RADIO_AVS &&
linktype != DLT_IEEE802_11_RADIO &&
linktype != DLT_PRISM_HEADER)
bpf_error("radio information not present in capture");
s = xfer_to_x(inst);
tmp = new_stmt(BPF_LD|BPF_IND|size);
sappend(s, tmp);
sappend(inst->s, s);
break;
case Q_LINK:
s = gen_llprefixlen();
if (s != NULL) {
sappend(s, xfer_to_a(inst));
sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
sappend(s, new_stmt(BPF_MISC|BPF_TAX));
} else
s = xfer_to_x(inst);
tmp = new_stmt(BPF_LD|BPF_IND|size);
tmp->s.k = off_ll;
sappend(s, tmp);
sappend(inst->s, s);
break;
case Q_IP:
case Q_ARP:
case Q_RARP:
case Q_ATALK:
case Q_DECNET:
case Q_SCA:
case Q_LAT:
case Q_MOPRC:
case Q_MOPDL:
#ifdef INET6
case Q_IPV6:
#endif
s = gen_off_macpl();
if (s != NULL) {
sappend(s, xfer_to_a(inst));
sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
sappend(s, new_stmt(BPF_MISC|BPF_TAX));
} else
s = xfer_to_x(inst);
tmp = new_stmt(BPF_LD|BPF_IND|size);
tmp->s.k = off_macpl + off_nl;
sappend(s, tmp);
sappend(inst->s, s);
b = gen_proto_abbrev(proto);
if (inst->b)
gen_and(inst->b, b);
inst->b = b;
break;
case Q_SCTP:
case Q_TCP:
case Q_UDP:
case Q_ICMP:
case Q_IGMP:
case Q_IGRP:
case Q_PIM:
case Q_VRRP:
s = gen_loadx_iphdrlen();
sappend(s, xfer_to_a(inst));
sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X));
sappend(s, new_stmt(BPF_MISC|BPF_TAX));
sappend(s, tmp = new_stmt(BPF_LD|BPF_IND|size));
tmp->s.k = off_macpl + off_nl;
sappend(inst->s, s);
gen_and(gen_proto_abbrev(proto), b = gen_ipfrag());
if (inst->b)
gen_and(inst->b, b);
#ifdef INET6
gen_and(gen_proto_abbrev(Q_IP), b);
#endif
inst->b = b;
break;
#ifdef INET6
case Q_ICMPV6:
bpf_error("IPv6 upper-layer protocol is not supported by proto[x]");
#endif
}
inst->regno = regno;
s = new_stmt(BPF_ST);
s->s.k = regno;
sappend(inst->s, s);
return inst;
}
struct block *
gen_relation(code, a0, a1, reversed)
int code;
struct arth *a0, *a1;
int reversed;
{
struct slist *s0, *s1, *s2;
struct block *b, *tmp;
s0 = xfer_to_x(a1);
s1 = xfer_to_a(a0);
if (code == BPF_JEQ) {
s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X);
b = new_block(JMP(code));
sappend(s1, s2);
}
else
b = new_block(BPF_JMP|code|BPF_X);
if (reversed)
gen_not(b);
sappend(s0, s1);
sappend(a1->s, s0);
sappend(a0->s, a1->s);
b->stmts = a0->s;
free_reg(a0->regno);
free_reg(a1->regno);
if (a0->b) {
if (a1->b) {
gen_and(a0->b, tmp = a1->b);
}
else
tmp = a0->b;
} else
tmp = a1->b;
if (tmp)
gen_and(tmp, b);
return b;
}
struct arth *
gen_loadlen()
{
int regno = alloc_reg();
struct arth *a = (struct arth *)newchunk(sizeof(*a));
struct slist *s;
s = new_stmt(BPF_LD|BPF_LEN);
s->next = new_stmt(BPF_ST);
s->next->s.k = regno;
a->s = s;
a->regno = regno;
return a;
}
struct arth *
gen_loadi(val)
int val;
{
struct arth *a;
struct slist *s;
int reg;
a = (struct arth *)newchunk(sizeof(*a));
reg = alloc_reg();
s = new_stmt(BPF_LD|BPF_IMM);
s->s.k = val;
s->next = new_stmt(BPF_ST);
s->next->s.k = reg;
a->s = s;
a->regno = reg;
return a;
}
struct arth *
gen_neg(a)
struct arth *a;
{
struct slist *s;
s = xfer_to_a(a);
sappend(a->s, s);
s = new_stmt(BPF_ALU|BPF_NEG);
s->s.k = 0;
sappend(a->s, s);
s = new_stmt(BPF_ST);
s->s.k = a->regno;
sappend(a->s, s);
return a;
}
struct arth *
gen_arth(code, a0, a1)
int code;
struct arth *a0, *a1;
{
struct slist *s0, *s1, *s2;
s0 = xfer_to_x(a1);
s1 = xfer_to_a(a0);
s2 = new_stmt(BPF_ALU|BPF_X|code);
sappend(s1, s2);
sappend(s0, s1);
sappend(a1->s, s0);
sappend(a0->s, a1->s);
free_reg(a0->regno);
free_reg(a1->regno);
s0 = new_stmt(BPF_ST);
a0->regno = s0->s.k = alloc_reg();
sappend(a0->s, s0);
return a0;
}
static int regused[BPF_MEMWORDS];
static int curreg;
static void
init_regs()
{
curreg = 0;
memset(regused, 0, sizeof regused);
}
static int
alloc_reg()
{
int n = BPF_MEMWORDS;
while (--n >= 0) {
if (regused[curreg])
curreg = (curreg + 1) % BPF_MEMWORDS;
else {
regused[curreg] = 1;
return curreg;
}
}
bpf_error("too many registers needed to evaluate expression");
return 0;
}
static void
free_reg(n)
int n;
{
regused[n] = 0;
}
static struct block *
gen_len(jmp, n)
int jmp, n;
{
struct slist *s;
struct block *b;
s = new_stmt(BPF_LD|BPF_LEN);
b = new_block(JMP(jmp));
b->stmts = s;
b->s.k = n;
return b;
}
struct block *
gen_greater(n)
int n;
{
return gen_len(BPF_JGE, n);
}
struct block *
gen_less(n)
int n;
{
struct block *b;
b = gen_len(BPF_JGT, n);
gen_not(b);
return b;
}
struct block *
gen_byteop(op, idx, val)
int op, idx, val;
{
struct block *b;
struct slist *s;
switch (op) {
default:
abort();
case '=':
return gen_cmp(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val);
case '<':
b = gen_cmp_lt(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val);
return b;
case '>':
b = gen_cmp_gt(OR_LINK, (u_int)idx, BPF_B, (bpf_int32)val);
return b;
case '|':
s = new_stmt(BPF_ALU|BPF_OR|BPF_K);
break;
case '&':
s = new_stmt(BPF_ALU|BPF_AND|BPF_K);
break;
}
s->s.k = val;
b = new_block(JMP(BPF_JEQ));
b->stmts = s;
gen_not(b);
return b;
}
static u_char abroadcast[] = { 0x0 };
struct block *
gen_broadcast(proto)
int proto;
{
bpf_u_int32 hostmask;
struct block *b0, *b1, *b2;
static u_char ebroadcast[] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
switch (proto) {
case Q_DEFAULT:
case Q_LINK:
switch (linktype) {
case DLT_ARCNET:
case DLT_ARCNET_LINUX:
return gen_ahostop(abroadcast, Q_DST);
case DLT_EN10MB:
return gen_ehostop(ebroadcast, Q_DST);
case DLT_FDDI:
return gen_fhostop(ebroadcast, Q_DST);
case DLT_IEEE802:
return gen_thostop(ebroadcast, Q_DST);
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
return gen_wlanhostop(ebroadcast, Q_DST);
case DLT_IP_OVER_FC:
return gen_ipfchostop(ebroadcast, Q_DST);
case DLT_SUNATM:
if (is_lane) {
b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS,
BPF_H, 0xFF00);
gen_not(b1);
b0 = gen_ehostop(ebroadcast, Q_DST);
gen_and(b1, b0);
return b0;
}
break;
default:
bpf_error("not a broadcast link");
}
break;
case Q_IP:
b0 = gen_linktype(ETHERTYPE_IP);
hostmask = ~netmask;
b1 = gen_mcmp(OR_NET, 16, BPF_W, (bpf_int32)0, hostmask);
b2 = gen_mcmp(OR_NET, 16, BPF_W,
(bpf_int32)(~0 & hostmask), hostmask);
gen_or(b1, b2);
gen_and(b0, b2);
return b2;
}
bpf_error("only link-layer/IP broadcast filters supported");
return NULL;
}
static struct block *
gen_mac_multicast(offset)
int offset;
{
register struct block *b0;
register struct slist *s;
s = gen_load_a(OR_LINK, offset, BPF_B);
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, *b2;
register struct slist *s;
switch (proto) {
case Q_DEFAULT:
case Q_LINK:
switch (linktype) {
case DLT_ARCNET:
case DLT_ARCNET_LINUX:
return gen_ahostop(abroadcast, Q_DST);
case DLT_EN10MB:
return gen_mac_multicast(0);
case DLT_FDDI:
return gen_mac_multicast(1);
case DLT_IEEE802:
return gen_mac_multicast(2);
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
case DLT_PPI:
s = gen_load_a(OR_LINK, 1, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x01;
b1->stmts = s;
b0 = gen_mac_multicast(16);
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 1, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x01;
b2->stmts = s;
gen_not(b2);
b1 = gen_mac_multicast(4);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x08;
b1->stmts = s;
gen_and(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b2 = new_block(JMP(BPF_JSET));
b2->s.k = 0x08;
b2->stmts = s;
gen_not(b2);
b1 = gen_mac_multicast(4);
gen_and(b2, b1);
gen_or(b1, b0);
s = gen_load_a(OR_LINK, 0, BPF_B);
b1 = new_block(JMP(BPF_JSET));
b1->s.k = 0x04;
b1->stmts = s;
gen_not(b1);
gen_and(b1, b0);
return b0;
case DLT_IP_OVER_FC:
b0 = gen_mac_multicast(2);
return b0;
case DLT_SUNATM:
if (is_lane) {
b1 = gen_cmp(OR_LINK, SUNATM_PKT_BEGIN_POS,
BPF_H, 0xFF00);
gen_not(b1);
b0 = gen_mac_multicast(off_mac);
gen_and(b1, b0);
return b0;
}
break;
default:
break;
}
break;
case Q_IP:
b0 = gen_linktype(ETHERTYPE_IP);
b1 = gen_cmp_ge(OR_NET, 16, BPF_B, (bpf_int32)224);
gen_and(b0, b1);
return b1;
#ifdef INET6
case Q_IPV6:
b0 = gen_linktype(ETHERTYPE_IPV6);
b1 = gen_cmp(OR_NET, 24, BPF_B, (bpf_int32)255);
gen_and(b0, b1);
return b1;
#endif
}
bpf_error("link-layer multicast filters supported only on ethernet/FDDI/token ring/ARCNET/802.11/ATM LANE/Fibre Channel");
return NULL;
}
struct block *
gen_inbound(dir)
int dir;
{
register struct block *b0;
switch (linktype) {
case DLT_SLIP:
b0 = gen_relation(BPF_JEQ,
gen_load(Q_LINK, gen_loadi(0), 1),
gen_loadi(0),
dir);
break;
case DLT_LINUX_SLL:
if (dir) {
b0 = gen_cmp(OR_LINK, 0, BPF_H, LINUX_SLL_OUTGOING);
} else {
b0 = gen_cmp(OR_LINK, 0, BPF_H, LINUX_SLL_HOST);
}
break;
#ifdef HAVE_NET_PFVAR_H
case DLT_PFLOG:
b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, dir), BPF_B,
(bpf_int32)((dir == 0) ? PF_IN : PF_OUT));
break;
#endif
case DLT_PPP_PPPD:
if (dir) {
b0 = gen_cmp(OR_LINK, 0, BPF_B, PPP_PPPD_OUT);
} else {
b0 = gen_cmp(OR_LINK, 0, BPF_B, PPP_PPPD_IN);
}
break;
case DLT_JUNIPER_MFR:
case DLT_JUNIPER_MLFR:
case DLT_JUNIPER_MLPPP:
case DLT_JUNIPER_ATM1:
case DLT_JUNIPER_ATM2:
case DLT_JUNIPER_PPPOE:
case DLT_JUNIPER_PPPOE_ATM:
case DLT_JUNIPER_GGSN:
case DLT_JUNIPER_ES:
case DLT_JUNIPER_MONITOR:
case DLT_JUNIPER_SERVICES:
case DLT_JUNIPER_ETHER:
case DLT_JUNIPER_PPP:
case DLT_JUNIPER_FRELAY:
case DLT_JUNIPER_CHDLC:
case DLT_JUNIPER_VP:
case DLT_JUNIPER_ST:
case DLT_JUNIPER_ISM:
if (dir) {
b0 = gen_mcmp(OR_LINK, 3, BPF_B, 0, 0x01);
} else {
b0 = gen_mcmp(OR_LINK, 3, BPF_B, 1, 0x01);
}
break;
default:
bpf_error("inbound/outbound not supported on linktype %d",
linktype);
b0 = NULL;
}
return (b0);
}
#ifdef HAVE_NET_PFVAR_H
struct block *
gen_pf_ifname(const char *ifname)
{
struct block *b0;
u_int len, off;
if (linktype != DLT_PFLOG) {
bpf_error("ifname supported only on PF linktype");
}
len = sizeof(((struct pfloghdr *)0)->ifname);
off = offsetof(struct pfloghdr, ifname);
if (strlen(ifname) >= len) {
bpf_error("ifname interface names can only be %d characters",
len-1);
}
b0 = gen_bcmp(OR_LINK, off, strlen(ifname), (const u_char *)ifname);
return (b0);
}
struct block *
gen_pf_ruleset(char *ruleset)
{
struct block *b0;
if (linktype != DLT_PFLOG) {
bpf_error("ruleset supported only on PF linktype");
}
if (strlen(ruleset) >= sizeof(((struct pfloghdr *)0)->ruleset)) {
bpf_error("ruleset names can only be %ld characters",
(long)(sizeof(((struct pfloghdr *)0)->ruleset) - 1));
}
b0 = gen_bcmp(OR_LINK, offsetof(struct pfloghdr, ruleset),
strlen(ruleset), (const u_char *)ruleset);
return (b0);
}
struct block *
gen_pf_rnr(int rnr)
{
struct block *b0;
if (linktype != DLT_PFLOG) {
bpf_error("rnr supported only on PF linktype");
}
b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, rulenr), BPF_W,
(bpf_int32)rnr);
return (b0);
}
struct block *
gen_pf_srnr(int srnr)
{
struct block *b0;
if (linktype != DLT_PFLOG) {
bpf_error("srnr supported only on PF linktype");
}
b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, subrulenr), BPF_W,
(bpf_int32)srnr);
return (b0);
}
struct block *
gen_pf_reason(int reason)
{
struct block *b0;
if (linktype != DLT_PFLOG) {
bpf_error("reason supported only on PF linktype");
}
b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, reason), BPF_B,
(bpf_int32)reason);
return (b0);
}
struct block *
gen_pf_action(int action)
{
struct block *b0;
if (linktype != DLT_PFLOG) {
bpf_error("action supported only on PF linktype");
}
b0 = gen_cmp(OR_LINK, offsetof(struct pfloghdr, action), BPF_B,
(bpf_int32)action);
return (b0);
}
#else
struct block *
gen_pf_ifname(const char *ifname)
{
bpf_error("libpcap was compiled without pf support");
return (NULL);
}
struct block *
gen_pf_ruleset(char *ruleset)
{
bpf_error("libpcap was compiled on a machine without pf support");
return (NULL);
}
struct block *
gen_pf_rnr(int rnr)
{
bpf_error("libpcap was compiled on a machine without pf support");
return (NULL);
}
struct block *
gen_pf_srnr(int srnr)
{
bpf_error("libpcap was compiled on a machine without pf support");
return (NULL);
}
struct block *
gen_pf_reason(int reason)
{
bpf_error("libpcap was compiled on a machine without pf support");
return (NULL);
}
struct block *
gen_pf_action(int action)
{
bpf_error("libpcap was compiled on a machine without pf support");
return (NULL);
}
#endif
struct block *
gen_p80211_type(int type, int mask)
{
struct block *b0;
switch (linktype) {
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
b0 = gen_mcmp(OR_LINK, 0, BPF_B, (bpf_int32)type,
(bpf_int32)mask);
break;
default:
bpf_error("802.11 link-layer types supported only on 802.11");
}
return (b0);
}
struct block *
gen_p80211_fcdir(int fcdir)
{
struct block *b0;
switch (linktype) {
case DLT_IEEE802_11:
case DLT_PRISM_HEADER:
case DLT_IEEE802_11_RADIO_AVS:
case DLT_IEEE802_11_RADIO:
break;
default:
bpf_error("frame direction supported only with 802.11 headers");
}
b0 = gen_mcmp(OR_LINK, 1, BPF_B, (bpf_int32)fcdir,
(bpf_u_int32)IEEE80211_FC1_DIR_MASK);
return (b0);
}
struct block *
gen_acode(eaddr, q)
register const u_char *eaddr;
struct qual q;
{
switch (linktype) {
case DLT_ARCNET:
case DLT_ARCNET_LINUX:
if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) &&
q.proto == Q_LINK)
return (gen_ahostop(eaddr, (int)q.dir));
else {
bpf_error("ARCnet address used in non-arc expression");
}
break;
default:
bpf_error("aid supported only on ARCnet");
}
bpf_error("ARCnet address used in non-arc expression");
return NULL;
}
static struct block *
gen_ahostop(eaddr, dir)
register const u_char *eaddr;
register int dir;
{
register struct block *b0, *b1;
switch (dir) {
case Q_SRC:
return gen_bcmp(OR_LINK, 0, 1, eaddr);
case Q_DST:
return gen_bcmp(OR_LINK, 1, 1, eaddr);
case Q_AND:
b0 = gen_ahostop(eaddr, Q_SRC);
b1 = gen_ahostop(eaddr, Q_DST);
gen_and(b0, b1);
return b1;
case Q_DEFAULT:
case Q_OR:
b0 = gen_ahostop(eaddr, Q_SRC);
b1 = gen_ahostop(eaddr, Q_DST);
gen_or(b0, b1);
return b1;
}
abort();
}
struct block *
gen_vlan(vlan_num)
int vlan_num;
{
struct block *b0, *b1;
if (label_stack_depth > 0)
bpf_error("no VLAN match after MPLS");
orig_nl = off_nl;
switch (linktype) {
case DLT_EN10MB:
b0 = gen_cmp(OR_LINK, off_linktype, BPF_H,
(bpf_int32)ETHERTYPE_8021Q);
if (vlan_num >= 0) {
b1 = gen_mcmp(OR_MACPL, 0, BPF_H,
(bpf_int32)vlan_num, 0x0fff);
gen_and(b0, b1);
b0 = b1;
}
off_macpl += 4;
off_linktype += 4;
#if 0
off_nl_nosnap += 4;
off_nl += 4;
#endif
break;
default:
bpf_error("no VLAN support for data link type %d",
linktype);
}
return (b0);
}
struct block *
gen_mpls(label_num)
int label_num;
{
struct block *b0,*b1;
orig_nl = off_nl;
if (label_stack_depth > 0) {
b0 = gen_mcmp(OR_MACPL, orig_nl-2, BPF_B, 0, 0x01);
} else {
switch (linktype) {
case DLT_C_HDLC:
case DLT_EN10MB:
b0 = gen_linktype(ETHERTYPE_MPLS);
break;
case DLT_PPP:
b0 = gen_linktype(PPP_MPLS_UCAST);
break;
default:
bpf_error("no MPLS support for data link type %d",
linktype);
b0 = NULL;
break;
}
}
if (label_num >= 0) {
label_num = label_num << 12;
b1 = gen_mcmp(OR_MACPL, orig_nl, BPF_W, (bpf_int32)label_num,
0xfffff000);
gen_and(b0, b1);
b0 = b1;
}
off_nl_nosnap += 4;
off_nl += 4;
label_stack_depth++;
return (b0);
}
struct block *
gen_pppoed()
{
return gen_linktype((bpf_int32)ETHERTYPE_PPPOED);
}
struct block *
gen_pppoes()
{
struct block *b0;
b0 = gen_linktype((bpf_int32)ETHERTYPE_PPPOES);
orig_linktype = off_linktype;
orig_nl = off_nl;
is_pppoes = 1;
off_linktype = off_nl + 6;
off_nl = 6+2;
off_nl_nosnap = 6+2;
return b0;
}
struct block *
gen_atmfield_code(atmfield, jvalue, jtype, reverse)
int atmfield;
bpf_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 == (u_int)-1)
abort();
b0 = gen_ncmp(OR_LINK, off_vpi, BPF_B, 0xffffffff, jtype,
reverse, jvalue);
break;
case A_VCI:
if (!is_atm)
bpf_error("'vci' supported only on raw ATM");
if (off_vci == (u_int)-1)
abort();
b0 = gen_ncmp(OR_LINK, off_vci, BPF_H, 0xffffffff, jtype,
reverse, jvalue);
break;
case A_PROTOTYPE:
if (off_proto == (u_int)-1)
abort();
b0 = gen_ncmp(OR_LINK, off_proto, BPF_B, 0x0f, jtype,
reverse, jvalue);
break;
case A_MSGTYPE:
if (off_payload == (u_int)-1)
abort();
b0 = gen_ncmp(OR_LINK, off_payload + MSG_TYPE_POS, BPF_B,
0xffffffff, jtype, reverse, jvalue);
break;
case A_CALLREFTYPE:
if (!is_atm)
bpf_error("'callref' supported only on raw ATM");
if (off_proto == (u_int)-1)
abort();
b0 = gen_ncmp(OR_LINK, off_proto, BPF_B, 0xffffffff,
jtype, reverse, jvalue);
break;
default:
abort();
}
return b0;
}
struct block *
gen_atmtype_abbrev(type)
int type;
{
struct block *b0, *b1;
switch (type) {
case A_METAC:
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:
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:
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:
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:
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:
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:
if (!is_atm)
bpf_error("'lane' supported only on raw ATM");
b1 = gen_atmfield_code(A_PROTOTYPE, PT_LANE, BPF_JEQ, 0);
is_lane = 1;
off_mac = off_payload + 2;
off_linktype = off_mac + 12;
off_macpl = off_mac + 14;
off_nl = 0;
off_nl_nosnap = 3;
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:
abort();
}
return b1;
}
struct block *
gen_mtp2type_abbrev(type)
int type;
{
struct block *b0, *b1;
switch (type) {
case M_FISU:
if ( (linktype != DLT_MTP2) &&
(linktype != DLT_ERF) &&
(linktype != DLT_MTP2_WITH_PHDR) )
bpf_error("'fisu' supported only on MTP2");
b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JEQ, 0, 0);
break;
case M_LSSU:
if ( (linktype != DLT_MTP2) &&
(linktype != DLT_ERF) &&
(linktype != DLT_MTP2_WITH_PHDR) )
bpf_error("'lssu' supported only on MTP2");
b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 1, 2);
b1 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 0, 0);
gen_and(b1, b0);
break;
case M_MSU:
if ( (linktype != DLT_MTP2) &&
(linktype != DLT_ERF) &&
(linktype != DLT_MTP2_WITH_PHDR) )
bpf_error("'msu' supported only on MTP2");
b0 = gen_ncmp(OR_PACKET, off_li, BPF_B, 0x3f, BPF_JGT, 0, 2);
break;
default:
abort();
}
return b0;
}
struct block *
gen_mtp3field_code(mtp3field, jvalue, jtype, reverse)
int mtp3field;
bpf_u_int32 jvalue;
bpf_u_int32 jtype;
int reverse;
{
struct block *b0;
bpf_u_int32 val1 , val2 , val3;
switch (mtp3field) {
case M_SIO:
if (off_sio == (u_int)-1)
bpf_error("'sio' supported only on SS7");
if(jvalue > 255)
bpf_error("sio value %u too big; max value = 255",
jvalue);
b0 = gen_ncmp(OR_PACKET, off_sio, BPF_B, 0xffffffff,
(u_int)jtype, reverse, (u_int)jvalue);
break;
case M_OPC:
if (off_opc == (u_int)-1)
bpf_error("'opc' supported only on SS7");
if (jvalue > 16383)
bpf_error("opc value %u too big; max value = 16383",
jvalue);
val1 = jvalue & 0x00003c00;
val1 = val1 >>10;
val2 = jvalue & 0x000003fc;
val2 = val2 <<6;
val3 = jvalue & 0x00000003;
val3 = val3 <<22;
jvalue = val1 + val2 + val3;
b0 = gen_ncmp(OR_PACKET, off_opc, BPF_W, 0x00c0ff0f,
(u_int)jtype, reverse, (u_int)jvalue);
break;
case M_DPC:
if (off_dpc == (u_int)-1)
bpf_error("'dpc' supported only on SS7");
if (jvalue > 16383)
bpf_error("dpc value %u too big; max value = 16383",
jvalue);
val1 = jvalue & 0x000000ff;
val1 = val1 << 24;
val2 = jvalue & 0x00003f00;
val2 = val2 << 8;
jvalue = val1 + val2;
b0 = gen_ncmp(OR_PACKET, off_dpc, BPF_W, 0xff3f0000,
(u_int)jtype, reverse, (u_int)jvalue);
break;
case M_SLS:
if (off_sls == (u_int)-1)
bpf_error("'sls' supported only on SS7");
if (jvalue > 15)
bpf_error("sls value %u too big; max value = 15",
jvalue);
jvalue = jvalue << 4;
b0 = gen_ncmp(OR_PACKET, off_sls, BPF_B, 0xf0,
(u_int)jtype,reverse, (u_int)jvalue);
break;
default:
abort();
}
return b0;
}
static struct block *
gen_msg_abbrev(type)
int type;
{
struct block *b1;
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");
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:
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;
}