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Understand IPPROTO_ESP and IPPROTO_AH packets

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Submitted by: Angelos D. Keromytis <angelos@dsl.cis.upenn.edu>
This commit is contained in:
Brian Somers 2000-09-14 18:01:54 +00:00
parent fb90f7b3aa
commit 2231246bb3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=65846
2 changed files with 36 additions and 0 deletions
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2
usr.sbin/ppp/filter.h
View file

@ -32,6 +32,8 @@
#ifdef IPPROTO_GRE
#define P_GRE 6
#endif
#define P_ESP 7
#define P_AH 8
/* Operations - f_srcop, f_dstop */
#define OP_NONE 0

34
usr.sbin/ppp/ip.c
View file

@ -269,6 +269,16 @@ FilterCheck(const struct ip *pip, const struct filter *filter, unsigned *psecs)
sport = ntohs(0);
break;
#endif
case IPPROTO_ESP:
cproto = P_ESP;
estab = syn = finrst = -1;
sport = ntohs(0);
break;
case IPPROTO_AH:
cproto = P_AH;
estab = syn = finrst = -1;
sport = ntohs(0);
break;
case IPPROTO_UDP:
case IPPROTO_IPIP:
cproto = P_UDP;
@ -636,6 +646,30 @@ PacketCheck(struct bundle *bundle, unsigned char *cp, int nb,
}
break;
case IPPROTO_ESP:
if (logit && loglen < sizeof logbuf) {
snprintf(logbuf + loglen, sizeof logbuf - loglen,
"ESP: %s ---> ", inet_ntoa(pip->ip_src));
loglen += strlen(logbuf + loglen);
snprintf(logbuf + loglen, sizeof logbuf - loglen,
"%s, spi %08x", inet_ntoa(pip->ip_dst),
(u_int32_t) ptop);
loglen += strlen(logbuf + loglen);
}
break;
case IPPROTO_AH:
if (logit && loglen < sizeof logbuf) {
snprintf(logbuf + loglen, sizeof logbuf - loglen,
"AH: %s ---> ", inet_ntoa(pip->ip_src));
loglen += strlen(logbuf + loglen);
snprintf(logbuf + loglen, sizeof logbuf - loglen,
"%s, spi %08x", inet_ntoa(pip->ip_dst),
(u_int32_t) (ptop + sizeof(u_int32_t)));
loglen += strlen(logbuf + loglen);
}
break;
case IPPROTO_IGMP:
if (logit && loglen < sizeof logbuf) {
uh = (struct udphdr *) ptop;