sock: reset sk_err for ICMP packets read from error queue

Only when ICMP packets are enqueued onto the error queue,
sk_err is also set. Before f5f99309fa74 (sock: do not set sk_err
in sock_dequeue_err_skb), a subsequent error queue read
would set sk_err to the next error on the queue, or 0 if empty.
As no error types other than ICMP set this field, sk_err should
not be modified upon dequeuing them.

Only for ICMP errors, reset the (racy) sk_err. Some applications,
like traceroute, rely on it and go into a futile busy POLLERR
loop otherwise.

In principle, sk_err has to be set while an ICMP error is queued.
Testing is_icmp_err_skb(skb_next) approximates this without
requiring a full queue walk. Applications that receive both ICMP
and other errors cannot rely on this legacy behavior, as other
errors do not set sk_err in the first place.

Fixes: f5f99309fa74 (sock: do not set sk_err in sock_dequeue_err_skb)
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index ea6fa95..b45cd14 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -3714,20 +3714,29 @@ int sock_queue_err_skb(struct sock *sk, struct sk_buff *skb)
 }
 EXPORT_SYMBOL(sock_queue_err_skb);
 
+static bool is_icmp_err_skb(const struct sk_buff *skb)
+{
+       return skb && (SKB_EXT_ERR(skb)->ee.ee_origin == SO_EE_ORIGIN_ICMP ||
+                      SKB_EXT_ERR(skb)->ee.ee_origin == SO_EE_ORIGIN_ICMP6);
+}
+
 struct sk_buff *sock_dequeue_err_skb(struct sock *sk)
 {
        struct sk_buff_head *q = &sk->sk_error_queue;
-       struct sk_buff *skb, *skb_next;
+       struct sk_buff *skb, *skb_next = NULL;
+       bool icmp_next = false;
        unsigned long flags;
-       int err = 0;
 
        spin_lock_irqsave(&q->lock, flags);
        skb = __skb_dequeue(q);
        if (skb && (skb_next = skb_peek(q)))
-               err = SKB_EXT_ERR(skb_next)->ee.ee_errno;
+               icmp_next = is_icmp_err_skb(skb_next);
        spin_unlock_irqrestore(&q->lock, flags);
 
-       if (err)
+       if (is_icmp_err_skb(skb) && !icmp_next)
+               sk->sk_err = 0;
+
+       if (skb_next)
                sk->sk_error_report(sk);
 
        return skb;