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Import another fix from the OpenBSD-Stable branch:

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Fix by dhartmei@ and mcbride@
 1.433
 Properly m_copyback() modified TCP sequence number after demodulation
 1.432
 Fix icmp checksum when sequence number modlation is being used.
 Also fix a daddr vs saddr cut-n-paste error in ICMP error handling.

 Fixes PR 3724
This commit is contained in:
Max Laier 2004-04-11 17:28:22 +00:00
parent b855d39384
commit f43690eb9e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor-sys/pf/dist/; revision=128127
1 changed files with 11 additions and 6 deletions
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17
sys/contrib/pf/net/pf.c
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@ -1,4 +1,4 @@
/* $OpenBSD: pf.c,v 1.389.2.2 2004/03/14 00:13:42 brad Exp $ */
/* $OpenBSD: pf.c,v 1.389.2.3 2004/04/10 09:38:19 brad Exp $ */
/*
* Copyright (c) 2001 Daniel Hartmeier
@ -4004,6 +4004,7 @@ pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp,
struct pf_tree_node key;
struct pf_state_peer *src, *dst;
u_int8_t dws;
int copyback = 0;
/*
* Only the first 8 bytes of the TCP header can be
@ -4041,9 +4042,11 @@ pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp,
/* Demodulate sequence number */
seq = ntohl(th.th_seq) - src->seqdiff;
if (src->seqdiff)
pf_change_a(&th.th_seq, &th.th_sum,
if (src->seqdiff) {
pf_change_a(&th.th_seq, icmpsum,
htonl(seq), 0);
copyback = 1;
}
if (!SEQ_GEQ(src->seqhi, seq) ||
!SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
@ -4063,7 +4066,7 @@ pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp,
if (STATE_TRANSLATE(*state)) {
if (direction == PF_IN) {
pf_change_icmp(pd2.src, &th.th_sport,
saddr, &(*state)->lan.addr,
daddr, &(*state)->lan.addr,
(*state)->lan.port, NULL,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
@ -4074,6 +4077,10 @@ pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp,
pd2.ip_sum, icmpsum,
pd->ip_sum, 0, pd2.af);
}
copyback = 1;
}
if (copyback) {
switch (pd2.af) {
#ifdef INET
case AF_INET:
@ -4094,8 +4101,6 @@ pf_test_state_icmp(struct pf_state **state, int direction, struct ifnet *ifp,
#endif /* INET6 */
}
m_copyback(m, off2, 8, &th);
} else if (src->seqdiff) {
m_copyback(m, off2, 8, &th);
}
return (PF_PASS);