diff options
Diffstat (limited to 'target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c')
| -rw-r--r-- | target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c | 1944 |
1 files changed, 0 insertions, 1944 deletions
diff --git a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c b/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c deleted file mode 100644 index f3fc5a60fe..0000000000 --- a/target/linux/etrax-2.6/image/e100boot/src/libpcap-0.4/gencode.c +++ /dev/null @@ -1,1944 +0,0 @@ -/* - * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that: (1) source code distributions - * retain the above copyright notice and this paragraph in its entirety, (2) - * distributions including binary code include the above copyright notice and - * this paragraph in its entirety in the documentation or other materials - * provided with the distribution, and (3) all advertising materials mentioning - * features or use of this software display the following acknowledgement: - * ``This product includes software developed by the University of California, - * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of - * the University nor the names of its contributors may be used to endorse - * or promote products derived from this software without specific prior - * written permission. - * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED - * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. - */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /usr/local/cvs/linux/tools/build/e100boot/libpcap-0.4/gencode.c,v 1.1 1999/08/26 10:05:22 johana Exp $ (LBL)"; -#endif - -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/time.h> - -#if __STDC__ -struct mbuf; -struct rtentry; -#endif - -#include <net/if.h> - -#include <netinet/in.h> -#include <netinet/if_ether.h> - -#include <stdlib.h> -#include <memory.h> -#include <setjmp.h> -#if __STDC__ -#include <stdarg.h> -#else -#include <varargs.h> -#endif - -#include "pcap-int.h" - -#include "ethertype.h" -#include "gencode.h" -#include "ppp.h" -#include <pcap-namedb.h> - -#include "gnuc.h" -#ifdef HAVE_OS_PROTO_H -#include "os-proto.h" -#endif - -#define JMP(c) ((c)|BPF_JMP|BPF_K) - -/* Locals */ -static jmp_buf top_ctx; -static pcap_t *bpf_pcap; - -/* XXX */ -#ifdef PCAP_FDDIPAD -int pcap_fddipad = PCAP_FDDIPAD; -#else -int pcap_fddipad; -#endif - -/* VARARGS */ -__dead void -#if __STDC__ -bpf_error(const char *fmt, ...) -#else -bpf_error(fmt, va_alist) - const char *fmt; - va_dcl -#endif -{ - va_list ap; - -#if __STDC__ - va_start(ap, fmt); -#else - va_start(ap); -#endif - if (bpf_pcap != NULL) - (void)vsprintf(pcap_geterr(bpf_pcap), fmt, ap); - va_end(ap); - longjmp(top_ctx, 1); - /* NOTREACHED */ -} - -static void init_linktype(int); - -static int alloc_reg(void); -static void free_reg(int); - -static struct block *root; - -/* - * We divy out chunks of memory rather than call malloc each time so - * we don't have to worry about leaking memory. It's probably - * not a big deal if all this memory was wasted but it this ever - * goes into a library that would probably not be a good idea. - */ -#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(u_int, u_int, bpf_int32); -static struct block *gen_mcmp(u_int, u_int, bpf_int32, bpf_u_int32); -static struct block *gen_bcmp(u_int, u_int, const u_char *); -static struct block *gen_uncond(int); -static inline struct block *gen_true(void); -static inline struct block *gen_false(void); -static struct block *gen_linktype(int); -static struct block *gen_hostop(bpf_u_int32, bpf_u_int32, int, int, u_int, u_int); -static struct block *gen_ehostop(const u_char *, int); -static struct block *gen_fhostop(const u_char *, int); -static struct block *gen_dnhostop(bpf_u_int32, int, u_int); -static struct block *gen_host(bpf_u_int32, bpf_u_int32, int, int); -static struct block *gen_gateway(const u_char *, bpf_u_int32 **, int, int); -static struct block *gen_ipfrag(void); -static struct block *gen_portatom(int, bpf_int32); -struct block *gen_portop(int, int, int); -static struct block *gen_port(int, int, int); -static int lookup_proto(const char *, 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_len(int, int); - -static void * -newchunk(n) - u_int n; -{ - struct chunk *cp; - int k, size; - - /* XXX Round up to nearest long. */ - n = (n + sizeof(long) - 1) & ~(sizeof(long) - 1); - - 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); - 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; - } -} - -/* - * A strdup whose allocations are freed after code generation is over. - */ -char * -sdup(s) - register const char *s; -{ - int n = strlen(s) + 1; - char *cp = newchunk(n); - - strcpy(cp, s); - 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 -pcap_compile(pcap_t *p, struct bpf_program *program, - char *buf, int optimize, bpf_u_int32 mask) -{ - extern int n_errors; - int len; - - n_errors = 0; - root = NULL; - bpf_pcap = p; - if (setjmp(top_ctx)) { - freechunks(); - return (-1); - } - - netmask = mask; - snaplen = pcap_snapshot(p); - - lex_init(buf ? buf : ""); - init_linktype(pcap_datalink(p)); - (void)pcap_parse(); - - if (n_errors) - syntax(); - - if (root == NULL) - root = gen_retblk(snaplen); - - if (optimize) { - bpf_optimize(&root); - if (root == NULL || - (root->s.code == (BPF_RET|BPF_K) && root->s.k == 0)) - bpf_error("expression rejects all packets"); - } - program->bf_insns = icode_to_fcode(root, &len); - program->bf_len = len; - - freechunks(); - return (0); -} - -/* - * Backpatch the blocks in 'list' to 'target'. The 'sense' field indicates - * which of the jt and jf fields has been resolved and which is a pointer - * back to another unresolved block (or nil). At least one of the fields - * in each block is already resolved. - */ -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; - } -} - -/* - * Merge the lists in b0 and b1, using the 'sense' field to indicate - * which of jt and jf is the link. - */ -static void -merge(b0, b1) - struct block *b0, *b1; -{ - register struct block **p = &b0; - - /* Find end of list. */ - while (*p) - p = !((*p)->sense) ? &JT(*p) : &JF(*p); - - /* Concatenate the lists. */ - *p = b1; -} - -void -finish_parse(p) - struct block *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(offset, size, v) - u_int offset, size; - bpf_int32 v; -{ - struct slist *s; - struct block *b; - - s = new_stmt(BPF_LD|BPF_ABS|size); - s->s.k = offset; - - b = new_block(JMP(BPF_JEQ)); - b->stmts = s; - b->s.k = v; - - return b; -} - -static struct block * -gen_mcmp(offset, size, v, mask) - u_int offset, size; - bpf_int32 v; - bpf_u_int32 mask; -{ - struct block *b = gen_cmp(offset, size, v); - struct slist *s; - - if (mask != 0xffffffff) { - s = new_stmt(BPF_ALU|BPF_AND|BPF_K); - s->s.k = mask; - b->stmts->next = s; - } - return b; -} - -static struct block * -gen_bcmp(offset, size, v) - 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(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(offset + size - 2, BPF_H, w); - if (b != NULL) - gen_and(b, tmp); - b = tmp; - size -= 2; - } - if (size > 0) { - tmp = gen_cmp(offset, BPF_B, (bpf_int32)v[0]); - if (b != NULL) - gen_and(b, tmp); - b = tmp; - } - return b; -} - -/* - * Various code constructs need to know the layout of the data link - * layer. These variables give the necessary offsets. off_linktype - * is set to -1 for no encapsulation, in which case, IP is assumed. - */ -static u_int off_linktype; -static u_int off_nl; -static int linktype; - -static void -init_linktype(type) - int type; -{ - linktype = type; - - switch (type) { - - case DLT_EN10MB: - off_linktype = 12; - off_nl = 14; - return; - - case DLT_SLIP: - /* - * SLIP doesn't have a link level type. The 16 byte - * header is hacked into our SLIP driver. - */ - off_linktype = -1; - off_nl = 16; - return; - - case DLT_SLIP_BSDOS: - /* XXX this may be the same as the DLT_PPP_BSDOS case */ - off_linktype = -1; - /* XXX end */ - off_nl = 24; - return; - - case DLT_NULL: - off_linktype = 0; - off_nl = 4; - return; - - case DLT_PPP: - off_linktype = 2; - off_nl = 4; - return; - - case DLT_PPP_BSDOS: - off_linktype = 5; - off_nl = 24; - return; - - case DLT_FDDI: - /* - * FDDI doesn't really have a link-level type field. - * We assume that SSAP = SNAP is being used and pick - * out the encapsulated Ethernet type. - */ - off_linktype = 19; -#ifdef PCAP_FDDIPAD - off_linktype += pcap_fddipad; -#endif - off_nl = 21; -#ifdef PCAP_FDDIPAD - off_nl += pcap_fddipad; -#endif - return; - - case DLT_IEEE802: - off_linktype = 20; - off_nl = 22; - return; - - case DLT_ATM_RFC1483: - /* - * assume routed, non-ISO PDUs - * (i.e., LLC = 0xAA-AA-03, OUT = 0x00-00-00) - */ - off_linktype = 6; - off_nl = 8; - return; - - case DLT_RAW: - off_linktype = -1; - off_nl = 0; - return; - } - bpf_error("unknown data link type 0x%x", linktype); - /* NOTREACHED */ -} - -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); -} - -static struct block * -gen_linktype(proto) - register int proto; -{ - struct block *b0, *b1; - - /* If we're not using encapsulation and checking for IP, we're done */ - if (off_linktype == -1 && proto == ETHERTYPE_IP) - return gen_true(); - - switch (linktype) { - - case DLT_SLIP: - return gen_false(); - - case DLT_PPP: - if (proto == ETHERTYPE_IP) - proto = PPP_IP; /* XXX was 0x21 */ - break; - - case DLT_PPP_BSDOS: - switch (proto) { - - case ETHERTYPE_IP: - b0 = gen_cmp(off_linktype, BPF_H, PPP_IP); - b1 = gen_cmp(off_linktype, BPF_H, PPP_VJC); - gen_or(b0, b1); - b0 = gen_cmp(off_linktype, BPF_H, PPP_VJNC); - gen_or(b1, b0); - return b0; - - case ETHERTYPE_DN: - proto = PPP_DECNET; - break; - - case ETHERTYPE_ATALK: - proto = PPP_APPLE; - break; - - case ETHERTYPE_NS: - proto = PPP_NS; - break; - } - break; - - case DLT_NULL: - /* XXX */ - if (proto == ETHERTYPE_IP) - return (gen_cmp(0, BPF_W, (bpf_int32)htonl(AF_INET))); - else - return gen_false(); - } - return gen_cmp(off_linktype, BPF_H, (bpf_int32)proto); -} - -static struct block * -gen_hostop(addr, mask, dir, proto, src_off, dst_off) - bpf_u_int32 addr; - bpf_u_int32 mask; - int dir, proto; - u_int src_off, dst_off; -{ - struct block *b0, *b1; - u_int offset; - - switch (dir) { - - case Q_SRC: - offset = src_off; - break; - - case 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(offset, BPF_W, (bpf_int32)addr, mask); - gen_and(b0, b1); - return b1; -} - -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(6, 6, eaddr); - - case Q_DST: - return gen_bcmp(0, 6, eaddr); - - case Q_AND: - b0 = gen_ehostop(eaddr, Q_SRC); - b1 = gen_ehostop(eaddr, Q_DST); - gen_and(b0, b1); - return b1; - - case Q_DEFAULT: - case Q_OR: - b0 = gen_ehostop(eaddr, Q_SRC); - b1 = gen_ehostop(eaddr, Q_DST); - gen_or(b0, b1); - return b1; - } - abort(); - /* NOTREACHED */ -} - -/* - * Like gen_ehostop, but for DLT_FDDI - */ -static struct block * -gen_fhostop(eaddr, dir) - register const u_char *eaddr; - register int dir; -{ - struct block *b0, *b1; - - switch (dir) { - case Q_SRC: -#ifdef PCAP_FDDIPAD - return gen_bcmp(6 + 1 + pcap_fddipad, 6, eaddr); -#else - return gen_bcmp(6 + 1, 6, eaddr); -#endif - - case Q_DST: -#ifdef PCAP_FDDIPAD - return gen_bcmp(0 + 1 + pcap_fddipad, 6, eaddr); -#else - return gen_bcmp(0 + 1, 6, eaddr); -#endif - - case Q_AND: - b0 = gen_fhostop(eaddr, Q_SRC); - b1 = gen_fhostop(eaddr, Q_DST); - gen_and(b0, b1); - return b1; - - case Q_DEFAULT: - case Q_OR: - b0 = gen_fhostop(eaddr, Q_SRC); - b1 = gen_fhostop(eaddr, Q_DST); - gen_or(b0, b1); - return b1; - } - abort(); - /* NOTREACHED */ -} - -/* - * This is quite tricky because there may be pad bytes in front of the - * DECNET header, and then there are two possible data packet formats that - * carry both src and dst addresses, plus 5 packet types in a format that - * carries only the src node, plus 2 types that use a different format and - * also carry just the src node. - * - * Yuck. - * - * Instead of doing those all right, we just look for data packets with - * 0 or 1 bytes of padding. If you want to look at other packets, that - * will require a lot more hacking. - * - * To add support for filtering on DECNET "areas" (network numbers) - * one would want to add a "mask" argument to this routine. That would - * make the filter even more inefficient, although one could be clever - * and not generate masking instructions if the mask is 0xFFFF. - */ -static struct block * -gen_dnhostop(addr, dir, base_off) - bpf_u_int32 addr; - int dir; - u_int base_off; -{ - struct block *b0, *b1, *b2, *tmp; - u_int offset_lh; /* offset if long header is received */ - u_int offset_sh; /* offset if short header is received */ - - switch (dir) { - - case Q_DST: - offset_sh = 1; /* follows flags */ - offset_lh = 7; /* flgs,darea,dsubarea,HIORD */ - break; - - case Q_SRC: - offset_sh = 3; /* follows flags, dstnode */ - offset_lh = 15; /* flgs,darea,dsubarea,did,sarea,ssub,HIORD */ - break; - - case Q_AND: - /* Inefficient because we do our Calvinball dance twice */ - b0 = gen_dnhostop(addr, Q_SRC, base_off); - b1 = gen_dnhostop(addr, Q_DST, base_off); - gen_and(b0, b1); - return b1; - - case Q_OR: - case Q_DEFAULT: - /* Inefficient because we do our Calvinball dance twice */ - b0 = gen_dnhostop(addr, Q_SRC, base_off); - b1 = gen_dnhostop(addr, Q_DST, base_off); - gen_or(b0, b1); - return b1; - - default: - abort(); - } - b0 = gen_linktype(ETHERTYPE_DN); - /* Check for pad = 1, long header case */ - tmp = gen_mcmp(base_off + 2, BPF_H, - (bpf_int32)ntohs(0x0681), (bpf_int32)ntohs(0x07FF)); - b1 = gen_cmp(base_off + 2 + 1 + offset_lh, - BPF_H, (bpf_int32)ntohs(addr)); - gen_and(tmp, b1); - /* Check for pad = 0, long header case */ - tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x06, (bpf_int32)0x7); - b2 = gen_cmp(base_off + 2 + offset_lh, BPF_H, (bpf_int32)ntohs(addr)); - gen_and(tmp, b2); - gen_or(b2, b1); - /* Check for pad = 1, short header case */ - tmp = gen_mcmp(base_off + 2, BPF_H, - (bpf_int32)ntohs(0x0281), (bpf_int32)ntohs(0x07FF)); - b2 = gen_cmp(base_off + 2 + 1 + offset_sh, - BPF_H, (bpf_int32)ntohs(addr)); - gen_and(tmp, b2); - gen_or(b2, b1); - /* Check for pad = 0, short header case */ - tmp = gen_mcmp(base_off + 2, BPF_B, (bpf_int32)0x02, (bpf_int32)0x7); - b2 = gen_cmp(base_off + 2 + offset_sh, BPF_H, (bpf_int32)ntohs(addr)); - gen_and(tmp, b2); - gen_or(b2, b1); - - /* Combine with test for linktype */ - gen_and(b0, b1); - return b1; -} - -static struct block * -gen_host(addr, mask, proto, dir) - bpf_u_int32 addr; - bpf_u_int32 mask; - int proto; - int dir; -{ - struct block *b0, *b1; - - switch (proto) { - - case Q_DEFAULT: - b0 = gen_host(addr, mask, Q_IP, dir); - b1 = gen_host(addr, mask, Q_ARP, dir); - gen_or(b0, b1); - b0 = gen_host(addr, mask, Q_RARP, dir); - gen_or(b1, b0); - return b0; - - case Q_IP: - return gen_hostop(addr, mask, dir, ETHERTYPE_IP, - off_nl + 12, off_nl + 16); - - case Q_RARP: - return gen_hostop(addr, mask, dir, ETHERTYPE_REVARP, - off_nl + 14, off_nl + 24); - - case Q_ARP: - return gen_hostop(addr, mask, dir, ETHERTYPE_ARP, - off_nl + 14, off_nl + 24); - - case Q_TCP: - bpf_error("'tcp' modifier applied to host"); - - case Q_UDP: - bpf_error("'udp' modifier applied to host"); - - case Q_ICMP: - bpf_error("'icmp' modifier applied to host"); - - case Q_IGMP: - bpf_error("'igmp' modifier applied to host"); - - case Q_IGRP: - bpf_error("'igrp' modifier applied to host"); - - case Q_ATALK: - bpf_error("ATALK host filtering not implemented"); - - case Q_DECNET: - return gen_dnhostop(addr, dir, off_nl); - - case Q_SCA: - bpf_error("SCA host filtering not implemented"); - - case Q_LAT: - bpf_error("LAT host filtering not implemented"); - - case Q_MOPDL: - bpf_error("MOPDL host filtering not implemented"); - - case Q_MOPRC: - bpf_error("MOPRC host filtering not implemented"); - - default: - abort(); - } - /* NOTREACHED */ -} - -static struct block * -gen_gateway(eaddr, alist, proto, dir) - const u_char *eaddr; - bpf_u_int32 **alist; - int proto; - int dir; -{ - struct block *b0, *b1, *tmp; - - if (dir != 0) - bpf_error("direction applied to 'gateway'"); - - switch (proto) { - case Q_DEFAULT: - case Q_IP: - case Q_ARP: - case Q_RARP: - if (linktype == DLT_EN10MB) - b0 = gen_ehostop(eaddr, Q_OR); - else if (linktype == DLT_FDDI) - b0 = gen_fhostop(eaddr, Q_OR); - else - bpf_error( - "'gateway' supported only on ethernet or FDDI"); - - b1 = gen_host(**alist++, 0xffffffff, proto, Q_OR); - while (*alist) { - tmp = gen_host(**alist++, 0xffffffff, proto, Q_OR); - gen_or(b1, tmp); - b1 = tmp; - } - gen_not(b1); - gen_and(b0, b1); - return b1; - } - bpf_error("illegal modifier of 'gateway'"); - /* NOTREACHED */ -} - -struct block * -gen_proto_abbrev(proto) - int proto; -{ - struct block *b0, *b1; - - switch (proto) { - - case Q_TCP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)IPPROTO_TCP); - gen_and(b0, b1); - break; - - case Q_UDP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)IPPROTO_UDP); - gen_and(b0, b1); - break; - - case Q_ICMP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)IPPROTO_ICMP); - gen_and(b0, b1); - break; - - case Q_IGMP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)2); - gen_and(b0, b1); - break; - -#ifndef IPPROTO_IGRP -#define IPPROTO_IGRP 9 -#endif - case Q_IGRP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 9, BPF_B, (long)IPPROTO_IGRP); - gen_and(b0, b1); - break; - - case Q_IP: - b1 = gen_linktype(ETHERTYPE_IP); - break; - - case Q_ARP: - b1 = gen_linktype(ETHERTYPE_ARP); - break; - - case Q_RARP: - b1 = gen_linktype(ETHERTYPE_REVARP); - break; - - case Q_LINK: - bpf_error("link layer applied in wrong context"); - - case Q_ATALK: - b1 = gen_linktype(ETHERTYPE_ATALK); - break; - - case Q_DECNET: - b1 = gen_linktype(ETHERTYPE_DN); - break; - - case Q_SCA: - b1 = gen_linktype(ETHERTYPE_SCA); - break; - - 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; - - default: - abort(); - } - return b1; -} - -static struct block * -gen_ipfrag() -{ - struct slist *s; - struct block *b; - - /* not ip frag */ - s = new_stmt(BPF_LD|BPF_H|BPF_ABS); - s->s.k = off_nl + 6; - b = new_block(JMP(BPF_JSET)); - b->s.k = 0x1fff; - b->stmts = s; - gen_not(b); - - return b; -} - -static struct block * -gen_portatom(off, v) - int off; - bpf_int32 v; -{ - struct slist *s; - struct block *b; - - s = new_stmt(BPF_LDX|BPF_MSH|BPF_B); - s->s.k = off_nl; - - s->next = new_stmt(BPF_LD|BPF_IND|BPF_H); - s->next->s.k = off_nl + off; - - b = new_block(JMP(BPF_JEQ)); - b->stmts = s; - b->s.k = v; - - return b; -} - -struct block * -gen_portop(port, proto, dir) - int port, proto, dir; -{ - struct block *b0, *b1, *tmp; - - /* ip proto 'proto' */ - tmp = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)proto); - b0 = gen_ipfrag(); - gen_and(tmp, b0); - - switch (dir) { - case Q_SRC: - b1 = gen_portatom(0, (bpf_int32)port); - break; - - case Q_DST: - b1 = gen_portatom(2, (bpf_int32)port); - break; - - case Q_OR: - case Q_DEFAULT: - tmp = gen_portatom(0, (bpf_int32)port); - b1 = gen_portatom(2, (bpf_int32)port); - gen_or(tmp, b1); - break; - - case Q_AND: - tmp = gen_portatom(0, (bpf_int32)port); - b1 = gen_portatom(2, (bpf_int32)port); - gen_and(tmp, b1); - break; - - default: - abort(); - } - gen_and(b0, b1); - - return b1; -} - -static struct block * -gen_port(port, ip_proto, dir) - int port; - int ip_proto; - int dir; -{ - struct block *b0, *b1, *tmp; - - /* ether proto ip */ - b0 = gen_linktype(ETHERTYPE_IP); - - switch (ip_proto) { - case IPPROTO_UDP: - case IPPROTO_TCP: - 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); - break; - - default: - abort(); - } - gen_and(b0, b1); - return b1; -} - -static int -lookup_proto(name, proto) - register const char *name; - register int proto; -{ - register int v; - - switch (proto) { - - case Q_DEFAULT: - case Q_IP: - v = pcap_nametoproto(name); - if (v == PROTO_UNDEF) - bpf_error("unknown ip proto '%s'", name); - break; - - case Q_LINK: - /* XXX should look up h/w protocol type based on linktype */ - v = pcap_nametoeproto(name); - if (v == PROTO_UNDEF) - bpf_error("unknown ether proto '%s'", name); - break; - - default: - v = PROTO_UNDEF; - break; - } - return v; -} - -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: - case Q_IP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 9, BPF_B, (bpf_int32)v); - gen_and(b0, b1); - return b1; - - case Q_ARP: - bpf_error("arp does not encapsulate another protocol"); - /* NOTREACHED */ - - case Q_RARP: - bpf_error("rarp does not encapsulate another protocol"); - /* NOTREACHED */ - - case Q_ATALK: - bpf_error("atalk encapsulation is not specifiable"); - /* NOTREACHED */ - - case Q_DECNET: - bpf_error("decnet encapsulation is not specifiable"); - /* NOTREACHED */ - - case Q_SCA: - bpf_error("sca does not encapsulate another protocol"); - /* NOTREACHED */ - - case Q_LAT: - bpf_error("lat does not encapsulate another protocol"); - /* NOTREACHED */ - - case Q_MOPRC: - bpf_error("moprc does not encapsulate another protocol"); - /* NOTREACHED */ - - case Q_MOPDL: - bpf_error("mopdl does not encapsulate another protocol"); - /* NOTREACHED */ - - case Q_LINK: - return gen_linktype(v); - - case Q_UDP: - bpf_error("'udp proto' is bogus"); - /* NOTREACHED */ - - case Q_TCP: - bpf_error("'tcp proto' is bogus"); - /* NOTREACHED */ - - case Q_ICMP: - bpf_error("'icmp proto' is bogus"); - /* NOTREACHED */ - - case Q_IGMP: - bpf_error("'igmp proto' is bogus"); - /* NOTREACHED */ - - case Q_IGRP: - bpf_error("'igrp proto' is bogus"); - /* NOTREACHED */ - - default: - abort(); - /* NOTREACHED */ - } - /* NOTREACHED */ -} - -struct block * -gen_scode(name, q) - register const char *name; - struct qual q; -{ - int proto = q.proto; - int dir = q.dir; - int tproto; - u_char *eaddr; - bpf_u_int32 mask, addr, **alist; - struct block *b, *tmp; - int port, real_proto; - - switch (q.addr) { - - case Q_NET: - addr = pcap_nametonetaddr(name); - if (addr == 0) - bpf_error("unknown network '%s'", name); - /* Left justify network addr and calculate its network mask */ - mask = 0xffffffff; - while (addr && (addr & 0xff000000) == 0) { - addr <<= 8; - mask <<= 8; - } - return gen_host(addr, mask, proto, dir); - - case Q_DEFAULT: - case Q_HOST: - if (proto == Q_LINK) { - switch (linktype) { - - case DLT_EN10MB: - eaddr = pcap_ether_hostton(name); - if (eaddr == NULL) - bpf_error( - "unknown ether host '%s'", name); - return gen_ehostop(eaddr, dir); - - case DLT_FDDI: - eaddr = pcap_ether_hostton(name); - if (eaddr == NULL) - bpf_error( - "unknown FDDI host '%s'", name); - return gen_fhostop(eaddr, dir); - - default: - bpf_error( - "only ethernet/FDDI supports link-level host name"); - break; - } - } else if (proto == Q_DECNET) { - unsigned short dn_addr = __pcap_nametodnaddr(name); - /* - * I don't think DECNET hosts can be multihomed, so - * there is no need to build up a list of addresses - */ - return (gen_host(dn_addr, 0, proto, dir)); - } else { - alist = pcap_nametoaddr(name); - if (alist == NULL || *alist == NULL) - bpf_error("unknown host '%s'", name); - tproto = proto; - if (off_linktype == -1 && tproto == Q_DEFAULT) - tproto = Q_IP; - b = gen_host(**alist++, 0xffffffff, tproto, dir); - while (*alist) { - tmp = gen_host(**alist++, 0xffffffff, - tproto, dir); - gen_or(b, tmp); - b = tmp; - } - return b; - } - - case Q_PORT: - if (proto != Q_DEFAULT && proto != Q_UDP && proto != Q_TCP) - bpf_error("illegal qualifier of 'port'"); - if (pcap_nametoport(name, &port, &real_proto) == 0) - bpf_error("unknown port '%s'", name); - if (proto == Q_UDP) { - if (real_proto == IPPROTO_TCP) - bpf_error("port '%s' is tcp", name); - else - /* override PROTO_UNDEF */ - real_proto = IPPROTO_UDP; - } - if (proto == Q_TCP) { - if (real_proto == IPPROTO_UDP) - bpf_error("port '%s' is udp", name); - else - /* override PROTO_UNDEF */ - real_proto = IPPROTO_TCP; - } - return gen_port(port, real_proto, dir); - - case Q_GATEWAY: - 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); - return gen_gateway(eaddr, alist, proto, dir); - - 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_UNDEF: - syntax(); - /* NOTREACHED */ - } - abort(); - /* NOTREACHED */ -} - -struct block * -gen_mcode(s1, s2, masklen, q) - register const char *s1, *s2; - register int masklen; - struct qual q; -{ - register int nlen, mlen; - bpf_u_int32 n, m; - - nlen = __pcap_atoin(s1, &n); - /* Promote short ipaddr */ - n <<= 32 - nlen; - - if (s2 != NULL) { - mlen = __pcap_atoin(s2, &m); - /* Promote short ipaddr */ - m <<= 32 - mlen; - if ((n & ~m) != 0) - bpf_error("non-network bits set in \"%s mask %s\"", - s1, s2); - } else { - /* Convert mask len to mask */ - if (masklen > 32) - bpf_error("mask length must be <= 32"); - m = 0xffffffff << (32 - masklen); - if ((n & ~m) != 0) - bpf_error("non-network bits set in \"%s/%d\"", - s1, masklen); - } - - switch (q.addr) { - - case Q_NET: - return gen_host(n, m, q.proto, q.dir); - - default: - bpf_error("Mask syntax for networks only"); - /* NOTREACHED */ - } -} - -struct block * -gen_ncode(s, v, q) - register const char *s; - bpf_u_int32 v; - struct qual q; -{ - bpf_u_int32 mask; - int proto = q.proto; - int dir = q.dir; - register int vlen; - - if (s == NULL) - vlen = 32; - else if (q.proto == Q_DECNET) - vlen = __pcap_atodn(s, &v); - else - vlen = __pcap_atoin(s, &v); - - switch (q.addr) { - - case Q_DEFAULT: - case Q_HOST: - case Q_NET: - if (proto == Q_DECNET) - return gen_host(v, 0, proto, dir); - else if (proto == Q_LINK) { - bpf_error("illegal link layer address"); - } else { - mask = 0xffffffff; - if (s == NULL && q.addr == Q_NET) { - /* Promote short net number */ - while (v && (v & 0xff000000) == 0) { - v <<= 8; - mask <<= 8; - } - } else { - /* Promote short ipaddr */ - v <<= 32 - vlen; - mask <<= 32 - vlen; - } - return gen_host(v, mask, proto, dir); - } - - case Q_PORT: - if (proto == Q_UDP) - proto = IPPROTO_UDP; - else if (proto == Q_TCP) - proto = IPPROTO_TCP; - else if (proto == Q_DEFAULT) - proto = PROTO_UNDEF; - else - bpf_error("illegal qualifier of 'port'"); - - return gen_port((int)v, proto, dir); - - case Q_GATEWAY: - bpf_error("'gateway' requires a name"); - /* NOTREACHED */ - - case Q_PROTO: - return gen_proto((int)v, proto, dir); - - case Q_UNDEF: - syntax(); - /* NOTREACHED */ - - default: - abort(); - /* NOTREACHED */ - } - /* NOTREACHED */ -} - -struct block * -gen_ecode(eaddr, q) - register const u_char *eaddr; - struct qual q; -{ - if ((q.addr == Q_HOST || q.addr == Q_DEFAULT) && q.proto == Q_LINK) { - if (linktype == DLT_EN10MB) - return gen_ehostop(eaddr, (int)q.dir); - if (linktype == DLT_FDDI) - return gen_fhostop(eaddr, (int)q.dir); - } - bpf_error("ethernet address used in non-ether expression"); - /* NOTREACHED */ -} - -void -sappend(s0, s1) - struct slist *s0, *s1; -{ - /* - * This is definitely not the best way to do this, but the - * lists will rarely get long. - */ - while (s0->next) - s0 = s0->next; - s0->next = s1; -} - -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, index, size) - int proto; - struct arth *index; - int size; -{ - struct slist *s, *tmp; - struct block *b; - int regno = alloc_reg(); - - free_reg(index->regno); - switch (size) { - - default: - bpf_error("data size must be 1, 2, or 4"); - - case 1: - size = BPF_B; - break; - - case 2: - size = BPF_H; - break; - - case 4: - size = BPF_W; - break; - } - switch (proto) { - default: - bpf_error("unsupported index operation"); - - case Q_LINK: - s = xfer_to_x(index); - tmp = new_stmt(BPF_LD|BPF_IND|size); - sappend(s, tmp); - sappend(index->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: - /* XXX Note that we assume a fixed link link header here. */ - s = xfer_to_x(index); - tmp = new_stmt(BPF_LD|BPF_IND|size); - tmp->s.k = off_nl; - sappend(s, tmp); - sappend(index->s, s); - - b = gen_proto_abbrev(proto); - if (index->b) - gen_and(index->b, b); - index->b = b; - break; - - case Q_TCP: - case Q_UDP: - case Q_ICMP: - case Q_IGMP: - case Q_IGRP: - s = new_stmt(BPF_LDX|BPF_MSH|BPF_B); - s->s.k = off_nl; - sappend(s, xfer_to_a(index)); - sappend(s, new_stmt(BPF_ALU|BPF_ADD|BPF_X)); - sappend(s, new_stmt(BPF_MISC|BPF_TAX)); - sappend(s, tmp = new_stmt(BPF_LD|BPF_IND|size)); - tmp->s.k = off_nl; - sappend(index->s, s); - - gen_and(gen_proto_abbrev(proto), b = gen_ipfrag()); - if (index->b) - gen_and(index->b, b); - index->b = b; - break; - } - index->regno = regno; - s = new_stmt(BPF_ST); - s->s.k = regno; - sappend(index->s, s); - - return index; -} - -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); - s2 = new_stmt(BPF_ALU|BPF_SUB|BPF_X); - b = new_block(JMP(code)); - if (code == BPF_JGT || code == BPF_JGE) { - reversed = !reversed; - b->s.k = 0x80000000; - } - if (reversed) - gen_not(b); - - sappend(s1, s2); - sappend(s0, s1); - sappend(a1->s, s0); - sappend(a0->s, a1->s); - - b->stmts = a0->s; - - free_reg(a0->regno); - free_reg(a1->regno); - - /* 'and' together protocol checks */ - if (a0->b) { - if (a1->b) { - gen_and(a0->b, tmp = a1->b); - } - else - 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(a1->regno); - - s0 = new_stmt(BPF_ST); - a0->regno = s0->s.k = alloc_reg(); - sappend(a0->s, s0); - - return a0; -} - -/* - * Here we handle simple allocation of the scratch registers. - * If too many registers are alloc'd, the allocator punts. - */ -static int regused[BPF_MEMWORDS]; -static int curreg; - -/* - * Return the next free register. - */ -static int -alloc_reg() -{ - int n = BPF_MEMWORDS; - - while (--n >= 0) { - if (regused[curreg]) - curreg = (curreg + 1) % BPF_MEMWORDS; - else { - regused[curreg] = 1; - return curreg; - } - } - bpf_error("too many registers needed to evaluate expression"); - /* NOTREACHED */ -} - -/* - * Return a register to the table so it can - * be used later. - */ -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((u_int)idx, BPF_B, (bpf_int32)val); - - case '<': - b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val); - b->s.code = JMP(BPF_JGE); - gen_not(b); - return b; - - case '>': - b = gen_cmp((u_int)idx, BPF_B, (bpf_int32)val); - b->s.code = JMP(BPF_JGT); - 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; -} - -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: - if (linktype == DLT_EN10MB) - return gen_ehostop(ebroadcast, Q_DST); - if (linktype == DLT_FDDI) - return gen_fhostop(ebroadcast, Q_DST); - bpf_error("not a broadcast link"); - break; - - case Q_IP: - b0 = gen_linktype(ETHERTYPE_IP); - hostmask = ~netmask; - b1 = gen_mcmp(off_nl + 16, BPF_W, (bpf_int32)0, hostmask); - b2 = gen_mcmp(off_nl + 16, BPF_W, - (bpf_int32)(~0 & hostmask), hostmask); - gen_or(b1, b2); - gen_and(b0, b2); - return b2; - } - bpf_error("only ether/ip broadcast filters supported"); -} - -struct block * -gen_multicast(proto) - int proto; -{ - register struct block *b0, *b1; - register struct slist *s; - - switch (proto) { - - case Q_DEFAULT: - case Q_LINK: - if (linktype == DLT_EN10MB) { - /* ether[0] & 1 != 0 */ - s = new_stmt(BPF_LD|BPF_B|BPF_ABS); - s->s.k = 0; - b0 = new_block(JMP(BPF_JSET)); - b0->s.k = 1; - b0->stmts = s; - return b0; - } - - if (linktype == DLT_FDDI) { - /* XXX TEST THIS: MIGHT NOT PORT PROPERLY XXX */ - /* fddi[1] & 1 != 0 */ - s = new_stmt(BPF_LD|BPF_B|BPF_ABS); - s->s.k = 1; - b0 = new_block(JMP(BPF_JSET)); - b0->s.k = 1; - b0->stmts = s; - return b0; - } - /* Link not known to support multicasts */ - break; - - case Q_IP: - b0 = gen_linktype(ETHERTYPE_IP); - b1 = gen_cmp(off_nl + 16, BPF_B, (bpf_int32)224); - b1->s.code = JMP(BPF_JGE); - gen_and(b0, b1); - return b1; - } - bpf_error("only IP multicast filters supported on ethernet/FDDI"); -} - -/* - * generate command for inbound/outbound. It's here so we can - * make it link-type specific. 'dir' = 0 implies "inbound", - * = 1 implies "outbound". - */ -struct block * -gen_inbound(dir) - int dir; -{ - register struct block *b0; - - b0 = gen_relation(BPF_JEQ, - gen_load(Q_LINK, gen_loadi(0), 1), - gen_loadi(0), - dir); - return (b0); -} |