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Add a routine to generate code to load a value relative to the beginning 

of the transport-layer header, where the network layer is an IPv6
header, and use that.
This commit is contained in:
guy 2005-05-01 00:56:07 +00:00
parent 52cbb102dc
commit 800ef10d8c
1 changed files with 23 additions and 3 deletions
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26
gencode.c
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@ -21,7 +21,7 @@
*/
#ifndef lint
static const char rcsid[] _U_ =
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.221.2.9 2005-05-01 00:38:34 guy Exp $ (LBL)";
"@(#) $Header: /tcpdump/master/libpcap/gencode.c,v 1.221.2.10 2005-05-01 00:56:07 guy Exp $ (LBL)";
#endif
#ifdef HAVE_CONFIG_H
@ -166,6 +166,9 @@ static struct block *gen_ncmp(bpf_u_int32, bpf_u_int32, bpf_u_int32,
static struct slist *gen_load_llrel(u_int, u_int);
static struct slist *gen_load_nlrel(u_int, u_int);
static struct slist *gen_load_ipv4tlrel(u_int, u_int);
#ifdef INET6
static struct slist *gen_load_ipv6tlrel(u_int, u_int);
#endif
static struct block *gen_uncond(int);
static inline struct block *gen_true(void);
static inline struct block *gen_false(void);
@ -1120,6 +1123,23 @@ gen_load_ipv4tlrel(offset, size)
return s;
}
#ifdef INET6
/*
* Load a value relative to the beginning of the transport-layer header,
* where the network-layer header is an IPv6 header. (This doesn't handle
* extension headers.)
*/
static struct slist *
gen_load_ipv6tlrel(offset, size)
u_int offset, size;
{
struct slist *s;
s = gen_load_nlrel(40 + offset, size);
return s;
}
#endif
static struct block *
gen_uncond(rsense)
int rsense;
@ -3555,13 +3575,13 @@ gen_portrangeatom6(off, v1, v2)
v2 = vtemp;
}
s1 = gen_load_nlrel(40 + off, BPF_H);
s1 = gen_load_ipv6tlrel(off, BPF_H);
b1 = new_block(JMP(BPF_JGE));
b1->stmts = s1;
b1->s.k = v1;
s2 = gen_load_nlrel(40 + off, BPF_H);
s2 = gen_load_ipv6tlrel(off, BPF_H);
b2 = new_block(JMP(BPF_JGT));
gen_not(b2);