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Support GRE packets

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Submitted by: Harry Starr <starr@gccs.com.au>
This commit is contained in:
Brian Somers 1999-09-30 07:23:13 +00:00
parent b89392e703
commit 28149effa7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=51809
3 changed files with 49 additions and 1 deletions
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25
usr.sbin/ppp/filter.c
View File

@ -277,6 +277,24 @@ ParseIgmp(int argc, char const * const *argv, struct filterent *tgt)
return 1;
}
#ifdef P_GRE
static int
ParseGRE(int argc, char const * const *argv, struct filterent *tgt)
{
/*
* Filter currently is a catch-all. Requests are either permitted or
* dropped.
*/
if (argc != 0) {
log_Printf(LogWARN, "ParseGRE: Too many parameters\n");
return 0;
} else
tgt->f_srcop = OP_NONE;
return 1;
}
#endif
#ifdef P_OSPF
static int
ParseOspf(int argc, char const * const *argv, struct filterent *tgt)
@ -457,6 +475,11 @@ Parse(struct ipcp *ipcp, int argc, char const *const *argv,
case P_OSPF:
val = ParseOspf(argc, argv, &filterdata);
break;
#endif
#ifdef P_GRE
case P_GRE:
val = ParseGRE(argc, argv, &filterdata);
break;
#endif
}
@ -596,7 +619,7 @@ filter_Show(struct cmdargs const *arg)
}
static const char *protoname[] = {
"none", "tcp", "udp", "icmp", "ospf", "igmp"
"none", "tcp", "udp", "icmp", "ospf", "igmp", "gre"
};
const char *

3
usr.sbin/ppp/filter.h
View File

@ -29,6 +29,9 @@
#define P_OSPF 4
#endif
#define P_IGMP 5
#ifdef IPPROTO_GRE
#define P_GRE 6
#endif
/* Operations - f_srcop, f_dstop */
#define OP_NONE 0

22
usr.sbin/ppp/ip.c
View File

@ -170,6 +170,15 @@ FilterCheck(const struct ip *pip, const struct filter *filter)
estab = syn = finrst = -1;
sport = ntohs(0);
break;
#ifdef IPPROTO_GRE
case IPPROTO_GRE:
cproto = P_GRE;
if (datalen < 2) /* GRE uses 2-octet+ messages */
return (1);
estab = syn = finrst = -1;
sport = ntohs(0);
break;
#endif
#ifdef IPPROTO_OSPFIGP
case IPPROTO_OSPFIGP:
cproto = P_OSPF;
@ -360,6 +369,19 @@ PacketCheck(struct bundle *bundle, char *cp, int nb, struct filter *filter)
}
break;
#ifdef IPPROTO_GRE
case IPPROTO_GRE:
if (logit && loglen < sizeof logbuf) {
snprintf(logbuf + loglen, sizeof logbuf - loglen,
"GRE: %s ---> ", inet_ntoa(pip->ip_src));
loglen += strlen(logbuf + loglen);
snprintf(logbuf + loglen, sizeof logbuf - loglen,
"%s", inet_ntoa(pip->ip_dst));
loglen += strlen(logbuf + loglen);
}
break;
#endif
#ifdef IPPROTO_OSPFIGP
case IPPROTO_OSPFIGP:
if (logit && loglen < sizeof logbuf) {