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authorXin Long <lucien.xin@gmail.com>2017-02-17 07:45:41 +0300
committerDavid S. Miller <davem@davemloft.net>2017-02-20 02:17:59 +0300
commitea62504373fa9ff3ced27e07e1eac041888ecc46 (patch)
treeac30c689bd6d88b6356b7f39787fc55623e9cdd0 /net
parent16e1a91965b02fe24d24e8b8d7b2245d29ed6a70 (diff)
downloadlinux-ea62504373fa9ff3ced27e07e1eac041888ecc46.tar.xz
sctp: add a function to verify the sctp reconf chunk
This patch is to add a function sctp_verify_reconf to do some length check and multi-params check for sctp stream reconf according to rfc6525 section 3.1. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/sm_make_chunk.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 60d9fdcef440..969a30c7bb54 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -3801,3 +3801,62 @@ struct sctp_chunk *sctp_make_strreset_tsnresp(
return retval;
}
+
+bool sctp_verify_reconf(const struct sctp_association *asoc,
+ struct sctp_chunk *chunk,
+ struct sctp_paramhdr **errp)
+{
+ struct sctp_reconf_chunk *hdr;
+ union sctp_params param;
+ __u16 last = 0, cnt = 0;
+
+ hdr = (struct sctp_reconf_chunk *)chunk->chunk_hdr;
+ sctp_walk_params(param, hdr, params) {
+ __u16 length = ntohs(param.p->length);
+
+ *errp = param.p;
+ if (cnt++ > 2)
+ return false;
+ switch (param.p->type) {
+ case SCTP_PARAM_RESET_OUT_REQUEST:
+ if (length < sizeof(struct sctp_strreset_outreq) ||
+ (last && last != SCTP_PARAM_RESET_RESPONSE &&
+ last != SCTP_PARAM_RESET_IN_REQUEST))
+ return false;
+ break;
+ case SCTP_PARAM_RESET_IN_REQUEST:
+ if (length < sizeof(struct sctp_strreset_inreq) ||
+ (last && last != SCTP_PARAM_RESET_OUT_REQUEST))
+ return false;
+ break;
+ case SCTP_PARAM_RESET_RESPONSE:
+ if ((length != sizeof(struct sctp_strreset_resp) &&
+ length != sizeof(struct sctp_strreset_resptsn)) ||
+ (last && last != SCTP_PARAM_RESET_RESPONSE &&
+ last != SCTP_PARAM_RESET_OUT_REQUEST))
+ return false;
+ break;
+ case SCTP_PARAM_RESET_TSN_REQUEST:
+ if (length !=
+ sizeof(struct sctp_strreset_tsnreq) || last)
+ return false;
+ break;
+ case SCTP_PARAM_RESET_ADD_IN_STREAMS:
+ if (length != sizeof(struct sctp_strreset_addstrm) ||
+ (last && last != SCTP_PARAM_RESET_ADD_OUT_STREAMS))
+ return false;
+ break;
+ case SCTP_PARAM_RESET_ADD_OUT_STREAMS:
+ if (length != sizeof(struct sctp_strreset_addstrm) ||
+ (last && last != SCTP_PARAM_RESET_ADD_IN_STREAMS))
+ return false;
+ break;
+ default:
+ return false;
+ }
+
+ last = param.p->type;
+ }
+
+ return true;
+}