net/ipv6/udp: UDP encapsulation: move socket locking into udpv6_queue_rcv_skb()
In order to make sure that when the encap_rcv() hook is introduced it is not called with the socket lock held, move socket locking from callers into udpv6_queue_rcv_skb(), matching what happens in IPv4. Signed-off-by: Benjamin LaHaise <bcrl@kvack.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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f7ad74fef3
Коммит
cb80ef463d
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@ -558,14 +558,25 @@ int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
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goto drop;
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}
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if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf))
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goto drop;
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skb_dst_drop(skb);
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rc = __udpv6_queue_rcv_skb(sk, skb);
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bh_lock_sock(sk);
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rc = 0;
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if (!sock_owned_by_user(sk))
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rc = __udpv6_queue_rcv_skb(sk, skb);
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else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
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bh_unlock_sock(sk);
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goto drop;
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}
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bh_unlock_sock(sk);
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return rc;
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drop:
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atomic_inc(&sk->sk_drops);
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UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
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atomic_inc(&sk->sk_drops);
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kfree_skb(skb);
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return -1;
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}
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@ -614,37 +625,27 @@ static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk,
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static void flush_stack(struct sock **stack, unsigned int count,
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struct sk_buff *skb, unsigned int final)
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{
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unsigned int i;
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struct sk_buff *skb1 = NULL;
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struct sock *sk;
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struct sk_buff *skb1;
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unsigned int i;
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for (i = 0; i < count; i++) {
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skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
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sk = stack[i];
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if (skb1) {
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if (sk_rcvqueues_full(sk, skb1, sk->sk_rcvbuf)) {
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kfree_skb(skb1);
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goto drop;
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}
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bh_lock_sock(sk);
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if (!sock_owned_by_user(sk))
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udpv6_queue_rcv_skb(sk, skb1);
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else if (sk_add_backlog(sk, skb1, sk->sk_rcvbuf)) {
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kfree_skb(skb1);
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bh_unlock_sock(sk);
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goto drop;
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}
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bh_unlock_sock(sk);
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continue;
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if (likely(skb1 == NULL))
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skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
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if (!skb1) {
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atomic_inc(&sk->sk_drops);
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UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
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IS_UDPLITE(sk));
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UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
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IS_UDPLITE(sk));
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}
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drop:
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atomic_inc(&sk->sk_drops);
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UDP6_INC_STATS_BH(sock_net(sk),
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UDP_MIB_RCVBUFERRORS, IS_UDPLITE(sk));
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UDP6_INC_STATS_BH(sock_net(sk),
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UDP_MIB_INERRORS, IS_UDPLITE(sk));
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if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
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skb1 = NULL;
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}
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if (unlikely(skb1))
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kfree_skb(skb1);
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}
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/*
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* Note: called only from the BH handler context,
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@ -784,39 +785,29 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
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* for sock caches... i'll skip this for now.
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*/
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sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
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if (sk != NULL) {
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int ret = udpv6_queue_rcv_skb(sk, skb);
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sock_put(sk);
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if (sk == NULL) {
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if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
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goto discard;
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/* a return value > 0 means to resubmit the input, but
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* it wants the return to be -protocol, or 0
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*/
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if (ret > 0)
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return -ret;
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if (udp_lib_checksum_complete(skb))
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goto discard;
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UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS,
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proto == IPPROTO_UDPLITE);
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
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kfree_skb(skb);
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return 0;
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}
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/* deliver */
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if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
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goto discard;
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if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
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sock_put(sk);
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if (udp_lib_checksum_complete(skb))
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goto discard;
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}
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bh_lock_sock(sk);
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if (!sock_owned_by_user(sk))
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udpv6_queue_rcv_skb(sk, skb);
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else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
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atomic_inc(&sk->sk_drops);
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bh_unlock_sock(sk);
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sock_put(sk);
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goto discard;
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}
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bh_unlock_sock(sk);
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sock_put(sk);
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UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
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icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
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kfree_skb(skb);
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return 0;
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short_packet:
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