[SCTP]: Reject sctp packets with broadcast addresses.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 16 insertions, 6 deletions

diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 7f4fea173fb..5f69158c100 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -555,7 +555,8 @@ struct sctp_af {
         int             (*to_addr_param) (const union sctp_addr *,
                                           union sctp_addr_param *); 
         int             (*addr_valid)   (union sctp_addr *,
-                                         struct sctp_sock *);
+                                         struct sctp_sock *,
+                                         const struct sk_buff *);
         sctp_scope_t    (*scope) (union sctp_addr *);
         void            (*inaddr_any)   (union sctp_addr *, unsigned short);
         int             (*is_any)       (const union sctp_addr *);
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 1662f9cc869..70d6606e281 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -170,7 +170,8 @@ int sctp_rcv(struct sk_buff *skb)
          * IP broadcast addresses cannot be used in an SCTP transport
          * address."
          */
-        if (!af->addr_valid(&src, NULL) || !af->addr_valid(&dest, NULL))
+        if (!af->addr_valid(&src, NULL, skb) ||
+            !af->addr_valid(&dest, NULL, skb))
                 goto discard_it;
 
         asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport);
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index c20d282fac0..8ef08070c8b 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -523,7 +523,9 @@ static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
  * Return 0 - If the address is a non-unicast or an illegal address.
  * Return 1 - If the address is a unicast.
  */
-static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
+static int sctp_v6_addr_valid(union sctp_addr *addr,
+                              struct sctp_sock *sp,
+                              const struct sk_buff *skb)
 {
         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
 
@@ -537,7 +539,7 @@ static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
                         return 0;
                 sctp_v6_map_v4(addr);
-                return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
+                return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
         }
 
         /* Is this a non-unicast address */
diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 2088aa992b7..816c033d788 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -365,12 +365,18 @@ static int sctp_v4_is_any(const union sctp_addr *addr)
  * Return 0 - If the address is a non-unicast or an illegal address.
  * Return 1 - If the address is a unicast.
  */
-static int sctp_v4_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
+static int sctp_v4_addr_valid(union sctp_addr *addr,
+                              struct sctp_sock *sp,
+                              const struct sk_buff *skb)
 {
         /* Is this a non-unicast address or a unusable SCTP address? */
         if (IS_IPV4_UNUSABLE_ADDRESS(&addr->v4.sin_addr.s_addr))
                 return 0;
 
+        /* Is this a broadcast address? */
+        if (skb && ((struct rtable *)skb->dst)->rt_flags & RTCF_BROADCAST)
+                return 0;
+
         return 1;
 }
 
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index b41dcbb8968..b811691c35b 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -172,7 +172,7 @@ static inline int sctp_verify_addr(struct sock *sk, union sctp_addr *addr,
                 return -EINVAL;
 
         /* Is this a valid SCTP address?  */
-        if (!af->addr_valid(addr, sctp_sk(sk)))
+        if (!af->addr_valid(addr, sctp_sk(sk), NULL))
                 return -EINVAL;
 
         if (!sctp_sk(sk)->pf->send_verify(sctp_sk(sk), (addr)))