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/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 0f6e60a..5c9bada 100644 (file)
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1400,7 +1400,7 @@ int sctp_has_association(const union sctp_addr *laddr,
 int sctp_verify_init(const struct sctp_association *asoc, sctp_cid_t,
                     sctp_init_chunk_t *peer_init, struct sctp_chunk *chunk,
                     struct sctp_chunk **err_chunk);
-int sctp_process_init(struct sctp_association *, sctp_cid_t cid,
+int sctp_process_init(struct sctp_association *, struct sctp_chunk *chunk,
                      const union sctp_addr *peer,
                      sctp_init_chunk_t *init, gfp_t gfp);
 __u32 sctp_generate_tag(const struct sctp_endpoint *);

diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index f87ccb1..a7b65e9 100644 (file)
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -2242,14 +2242,17 @@ int sctp_verify_init(const struct sctp_association *asoc,
  * 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 @@ int sctp_process_init(struct sctp_association *asoc, sctp_cid_t cid,
         * 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 (file)
--- a/net/sctp/sm_sideeffect.c
+++ b/net/sctp/sm_sideeffect.c
@@ -595,8 +595,7 @@ static int sctp_cmd_process_init(sctp_cmd_seq_t *commands,
         * 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 (file)
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -393,8 +393,7 @@ sctp_disposition_t sctp_sf_do_5_1B_init(const struct sctp_endpoint *ep,
                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 @@ sctp_disposition_t sctp_sf_do_5_1D_ce(const struct sctp_endpoint *ep,
         */
        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 @@ static sctp_disposition_t sctp_sf_do_unexpected_init(
         * 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 @@ static sctp_disposition_t sctp_sf_do_dupcook_a(const struct sctp_endpoint *ep,
         */
        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 @@ static sctp_disposition_t sctp_sf_do_dupcook_b(const struct sctp_endpoint *ep,
         * 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;