sctp: fix to check the source address of COOKIE-ECHO chunk
SCTP does not check whether the source address of COOKIE-ECHO
chunk is the original address of INIT chunk or part of the any
address parameters saved in COOKIE in CLOSED state. So even if
the COOKIE-ECHO chunk is from any address but with correct COOKIE,
the COOKIE-ECHO chunk still be accepted. If the COOKIE is not from
a valid address, the assoc should not be established.
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index f87ccb1..a7b65e9 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2242,14 +2242,17 @@
* Returns 0 on failure, else success.
* FIXME: This is an association method.
*/
-int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
+int sctp_process_init(struct sctp_association *asoc, struct sctp_chunk *chunk,
const union sctp_addr *peer_addr,
sctp_init_chunk_t *peer_init, gfp_t gfp)
{
union sctp_params param;
struct sctp_transport *transport;
struct list_head *pos, *temp;
+ struct sctp_af *af;
+ union sctp_addr addr;
char *cookie;
+ int src_match = 0;
/* We must include the address that the INIT packet came from.
* This is the only address that matters for an INIT packet.
@@ -2261,18 +2264,31 @@
* added as the primary transport. The source address seems to
* be a a better choice than any of the embedded addresses.
*/
- if (peer_addr) {
- if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
- goto nomem;
- }
+ if(!sctp_assoc_add_peer(asoc, peer_addr, gfp, SCTP_ACTIVE))
+ goto nomem;
+
+ if (sctp_cmp_addr_exact(sctp_source(chunk), peer_addr))
+ src_match = 1;
/* Process the initialization parameters. */
sctp_walk_params(param, peer_init, init_hdr.params) {
+ if (!src_match && (param.p->type == SCTP_PARAM_IPV4_ADDRESS ||
+ param.p->type == SCTP_PARAM_IPV6_ADDRESS)) {
+ af = sctp_get_af_specific(param_type2af(param.p->type));
+ af->from_addr_param(&addr, param.addr,
+ chunk->sctp_hdr->source, 0);
+ if (sctp_cmp_addr_exact(sctp_source(chunk), &addr))
+ src_match = 1;
+ }
if (!sctp_process_param(asoc, param, peer_addr, gfp))
goto clean_up;
}
+ /* source address of chunk may not match any valid address */
+ if (!src_match)
+ goto clean_up;
+
/* AUTH: After processing the parameters, make sure that we
* have all the required info to potentially do authentications.
*/
diff --git a/net/sctp/sm_sideeffect.c b/net/sctp/sm_sideeffect.c
index 3b80fe2..d612ca1 100644
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -595,8 +595,7 @@
* fail during INIT processing (due to malloc problems),
* just return the error and stop processing the stack.
*/
- if (!sctp_process_init(asoc, chunk->chunk_hdr->type,
- sctp_source(chunk), peer_init, gfp))
+ if (!sctp_process_init(asoc, chunk, sctp_source(chunk), peer_init, gfp))
error = -ENOMEM;
else
error = 0;
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index ad3b43b..ab94932 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -393,8 +393,7 @@
goto nomem_init;
/* The call, sctp_process_init(), can fail on memory allocation. */
- if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
- sctp_source(chunk),
+ if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk),
(sctp_init_chunk_t *)chunk->chunk_hdr,
GFP_ATOMIC))
goto nomem_init;
@@ -725,7 +724,7 @@
*/
peer_init = &chunk->subh.cookie_hdr->c.peer_init[0];
- if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
+ if (!sctp_process_init(new_asoc, chunk,
&chunk->subh.cookie_hdr->c.peer_addr,
peer_init, GFP_ATOMIC))
goto nomem_init;
@@ -1464,8 +1463,7 @@
* Verification Tag and Peers Verification tag into a reserved
* place (local tie-tag and per tie-tag) within the state cookie.
*/
- if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
- sctp_source(chunk),
+ if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk),
(sctp_init_chunk_t *)chunk->chunk_hdr,
GFP_ATOMIC))
goto nomem;
@@ -1694,8 +1692,7 @@
*/
peer_init = &chunk->subh.cookie_hdr->c.peer_init[0];
- if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
- sctp_source(chunk), peer_init,
+ if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init,
GFP_ATOMIC))
goto nomem;
@@ -1780,8 +1777,7 @@
* side effects--it is safe to run them here.
*/
peer_init = &chunk->subh.cookie_hdr->c.peer_init[0];
- if (!sctp_process_init(new_asoc, chunk->chunk_hdr->type,
- sctp_source(chunk), peer_init,
+ if (!sctp_process_init(new_asoc, chunk, sctp_source(chunk), peer_init,
GFP_ATOMIC))
goto nomem;