[IPV4/6]: Check if packet was actually delivered to a raw socket to decide whether to send an ICMP unreachable

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

4 files changed, 12 insertions, 6 deletions

diff --git a/net/ipv4/ip_input.c b/net/ipv4/ip_input.c
index d603247bdfe9..81e18023dc19 100644
--- a/net/ipv4/ip_input.c
+++ b/net/ipv4/ip_input.c
@@ -225,8 +225,8 @@ static inline int ip_local_deliver_finish(struct sk_buff *skb)
                 /* If there maybe a raw socket we must check - if not we
                  * don't care less
                  */
-                if (raw_sk)
-                        raw_v4_input(skb, skb->nh.iph, hash);
+                if (raw_sk && !raw_v4_input(skb, skb->nh.iph, hash))
+                        raw_sk = NULL;
 
                 if ((ipprot = rcu_dereference(inet_protos[hash])) != NULL) {
                         int ret;
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index d1835b1bc8c4..e222c5c26b32 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -150,10 +150,11 @@ static __inline__ int icmp_filter(struct sock *sk, struct sk_buff *skb)
  * RFC 1122: SHOULD pass TOS value up to the transport layer.
  * -> It does. And not only TOS, but all IP header.
  */
-void raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
+int raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
 {
         struct sock *sk;
         struct hlist_head *head;
+        int delivered = 0;
 
         read_lock(&raw_v4_lock);
         head = &raw_v4_htable[hash];
@@ -164,6 +165,7 @@ void raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
                              skb->dev->ifindex);
 
         while (sk) {
+                delivered = 1;
                 if (iph->protocol != IPPROTO_ICMP || !icmp_filter(sk, skb)) {
                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 
@@ -177,6 +179,7 @@ void raw_v4_input(struct sk_buff *skb, struct iphdr *iph, int hash)
         }
 out:
         read_unlock(&raw_v4_lock);
+        return delivered;
 }
 
 void raw_err (struct sock *sk, struct sk_buff *skb, u32 info)
diff --git a/net/ipv6/ip6_input.c b/net/ipv6/ip6_input.c
index ab51c0369e15..6e3480426939 100644
--- a/net/ipv6/ip6_input.c
+++ b/net/ipv6/ip6_input.c
@@ -166,8 +166,8 @@ resubmit:
         nexthdr = skb->nh.raw[nhoff];
 
         raw_sk = sk_head(&raw_v6_htable[nexthdr & (MAX_INET_PROTOS - 1)]);
-        if (raw_sk)
-                ipv6_raw_deliver(skb, nexthdr);
+        if (raw_sk && !ipv6_raw_deliver(skb, nexthdr))
+                raw_sk = NULL;
 
         hash = nexthdr & (MAX_INET_PROTOS - 1);
         if ((ipprot = rcu_dereference(inet6_protos[hash])) != NULL) {
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 9db0de81f074..a082646e6f16 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -141,11 +141,12 @@ static __inline__ int icmpv6_filter(struct sock *sk, struct sk_buff *skb)
  *
  *      Caller owns SKB so we must make clones.
  */
-void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
+int ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
 {
         struct in6_addr *saddr;
         struct in6_addr *daddr;
         struct sock *sk;
+        int delivered = 0;
         __u8 hash;
 
         saddr = &skb->nh.ipv6h->saddr;
@@ -167,6 +168,7 @@ void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
         sk = __raw_v6_lookup(sk, nexthdr, daddr, saddr, skb->dev->ifindex);
 
         while (sk) {
+                delivered = 1;
                 if (nexthdr != IPPROTO_ICMPV6 || !icmpv6_filter(sk, skb)) {
                         struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
 
@@ -179,6 +181,7 @@ void ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
         }
 out:
         read_unlock(&raw_v6_lock);
+        return delivered;
 }
 
 /* This cleans up af_inet6 a bit. -DaveM */