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b11ddf8 Initial revision
mcr authored
1 /*
2 * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 *
54b2ab1 @yuguy Patch from Monroe Williams <monroe@pobox.com>, submitted with NetBSD PR
yuguy authored
21 * @(#) $Header: /tcpdump/master/libpcap/gencode.h,v 1.44 2000-10-28 08:19:29 guy Exp $ (LBL)
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22 */
23
24 /* Address qualifiers. */
25
26 #define Q_HOST 1
27 #define Q_NET 2
28 #define Q_PORT 3
29 #define Q_GATEWAY 4
30 #define Q_PROTO 5
7fe3c11 IPv6 packet filtering code.
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31 #define Q_PROTOCHAIN 6
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32
33 /* Protocol qualifiers. */
34
35 #define Q_LINK 1
36 #define Q_IP 2
37 #define Q_ARP 3
38 #define Q_RARP 4
39 #define Q_TCP 5
40 #define Q_UDP 6
41 #define Q_ICMP 7
42 #define Q_IGMP 8
43 #define Q_IGRP 9
44
45
46 #define Q_ATALK 10
47 #define Q_DECNET 11
48 #define Q_LAT 12
49 #define Q_SCA 13
50 #define Q_MOPRC 14
51 #define Q_MOPDL 15
52
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53
54 #define Q_IPV6 16
55 #define Q_ICMPV6 17
56 #define Q_AH 18
57 #define Q_ESP 19
58
59 #define Q_PIM 20
60
54b2ab1 @yuguy Patch from Monroe Williams <monroe@pobox.com>, submitted with NetBSD PR
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61 #define Q_AARP 21
62
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63 /* Directional qualifiers. */
64
65 #define Q_SRC 1
66 #define Q_DST 2
67 #define Q_OR 3
68 #define Q_AND 4
69
70 #define Q_DEFAULT 0
71 #define Q_UNDEF 255
72
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73 struct slist;
74
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75 struct stmt {
76 int code;
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77 struct slist *jt; /*only for relative jump in block*/
78 struct slist *jf; /*only for relative jump in block*/
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79 bpf_int32 k;
80 };
81
82 struct slist {
83 struct stmt s;
84 struct slist *next;
85 };
86
87 /*
88 * A bit vector to represent definition sets. We assume TOT_REGISTERS
89 * is smaller than 8*sizeof(atomset).
90 */
91 typedef bpf_u_int32 atomset;
92 #define ATOMMASK(n) (1 << (n))
93 #define ATOMELEM(d, n) (d & ATOMMASK(n))
94
95 /*
96 * An unbounded set.
97 */
98 typedef bpf_u_int32 *uset;
99
100 /*
101 * Total number of atomic entities, including accumulator (A) and index (X).
102 * We treat all these guys similarly during flow analysis.
103 */
104 #define N_ATOMS (BPF_MEMWORDS+2)
105
106 struct edge {
107 int id;
108 int code;
109 uset edom;
110 struct block *succ;
111 struct block *pred;
112 struct edge *next; /* link list of incoming edges for a node */
113 };
114
115 struct block {
116 int id;
117 struct slist *stmts; /* side effect stmts */
118 struct stmt s; /* branch stmt */
119 int mark;
120 int longjt; /* jt branch requires long jump */
121 int longjf; /* jf branch requires long jump */
122 int level;
123 int offset;
124 int sense;
125 struct edge et;
126 struct edge ef;
127 struct block *head;
128 struct block *link; /* link field used by optimizer */
129 uset dom;
130 uset closure;
131 struct edge *in_edges;
132 atomset def, kill;
133 atomset in_use;
134 atomset out_use;
135 int oval;
136 int val[N_ATOMS];
137 };
138
139 struct arth {
140 struct block *b; /* protocol checks */
141 struct slist *s; /* stmt list */
142 int regno; /* virtual register number of result */
143 };
144
145 struct qual {
146 unsigned char addr;
147 unsigned char proto;
148 unsigned char dir;
149 unsigned char pad;
150 };
151
152 struct arth *gen_loadi(int);
153 struct arth *gen_load(int, struct arth *, int);
154 struct arth *gen_loadlen(void);
155 struct arth *gen_neg(struct arth *);
156 struct arth *gen_arth(int, struct arth *, struct arth *);
157
158 void gen_and(struct block *, struct block *);
159 void gen_or(struct block *, struct block *);
160 void gen_not(struct block *);
161
162 struct block *gen_scode(const char *, struct qual);
163 struct block *gen_ecode(const u_char *, struct qual);
164 struct block *gen_mcode(const char *, const char *, int, struct qual);
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165 #ifdef INET6
166 struct block *gen_mcode6(const char *, const char *, int, struct qual);
167 #endif
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168 struct block *gen_ncode(const char *, bpf_u_int32, struct qual);
169 struct block *gen_proto_abbrev(int);
170 struct block *gen_relation(int, struct arth *, struct arth *, int);
171 struct block *gen_less(int);
172 struct block *gen_greater(int);
173 struct block *gen_byteop(int, int, int);
174 struct block *gen_broadcast(int);
175 struct block *gen_multicast(int);
176 struct block *gen_inbound(int);
177
98a503e @yuguy Improved VLAN support, from Peter Jeremy - "vlan" filtering keyword,
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178 struct block *gen_vlan(int);
179
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180 void bpf_optimize(struct block **);
0e2f8c8 add config.h, remove gnuc.h. remove __dead
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181 void bpf_error(const char *, ...)
417d093 (bpf_error): conditionalize __attribute__
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182 #if HAVE___ATTRIBUTE__
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183 __attribute__((noreturn, format (printf, 1, 2)))
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184 #endif
185 ;
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186
187 void finish_parse(struct block *);
188 char *sdup(const char *);
189
190 struct bpf_insn *icode_to_fcode(struct block *, int *);
8254747 @yuguy When attaching a "bpf_program" to a "pcap_t" to use as a userland
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191 int install_bpf_program(pcap_t *, struct bpf_program *);
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192 int pcap_parse(void);
193 void lex_init(char *);
0d0297b @yuguy Older versions of Flex (e.g., 2.5.2, which at least one user had) dump
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194 void lex_cleanup(void);
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195 void sappend(struct slist *, struct slist *);
196
197 /* XXX */
198 #define JT(b) ((b)->et.succ)
199 #define JF(b) ((b)->ef.succ)
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200
201 extern int no_optimize;
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