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libalias: improve handling of invalid SCTP packets

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In case of a paritial chunk only pretend the result is OK if
the packet is not the last fragment and there is a valid association.

PR:		267476
MFC after:	3 days
This commit is contained in:
Michael Tuexen 2022-11-15 21:05:02 +01:00
parent e471259313
commit 9a71437621
1 changed files with 7 additions and 4 deletions
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11
sys/netinet/libalias/alias_sctp.c
View file

@ -754,8 +754,11 @@ SctpAlias(struct libalias *la, struct ip *pip, int direction)
case SN_PARSE_OK:
break;
case SN_PARSE_ERROR_CHHL:
/* Not an error if there is a chunk length parsing error and this is a fragmented packet */
if (ntohs(pip->ip_off) & IP_MF) {
/*
* Not an error, if there is a chunk length parsing error,
* this is a fragmented packet, and we have a valid assoc.
*/
if ((assoc != NULL) && (ntohs(pip->ip_off) & IP_MF)) {
rtnval = SN_PARSE_OK;
break;
}
@ -1067,6 +1070,8 @@ sctp_PktParser(struct libalias *la, int direction, struct ip *pip,
* Also, I am only interested in the content of INIT and ADDIP chunks
*/
sm->msg = SN_SCTP_OTHER;/* Initialise to largest value*/
sm->chunk_length = 0; /* only care about length for key chunks */
// no mbuf stuff from Paolo yet so ...
sm->ip_hdr = pip;
/* remove ip header length from the bytes_left */
@ -1114,8 +1119,6 @@ sctp_PktParser(struct libalias *la, int direction, struct ip *pip,
chunk_count = 1;
/* Real packet parsing occurs below */
sm->msg = SN_SCTP_OTHER;/* Initialise to largest value*/
sm->chunk_length = 0; /* only care about length for key chunks */
while (IS_SCTP_CONTROL(chunk_hdr)) {
switch (chunk_hdr->chunk_type) {
case SCTP_INITIATION: