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ipv6: udp: Do a route lookup and update during release_cb
This patch adds a release_cb for UDPv6. It does a route lookup
and updates sk->sk_dst_cache if it is needed. It picks up the
left-over job from ip6_sk_update_pmtu() if the sk was owned
by user during the pmtu update.
It takes a rcu_read_lock to protect the __sk_dst_get() operations
because another thread may do ip6_dst_store() without taking the
sk lock (e.g. sendmsg).
Fixes: 45e4fd2668
("ipv6: Only create RTF_CACHE routes after encountering pmtu exception")
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Reported-by: Wei Wang <weiwan@google.com>
Cc: Cong Wang <xiyou.wangcong@gmail.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Wei Wang <weiwan@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
33c162a980
commit
e646b657f6
@ -960,6 +960,7 @@ int ip6_datagram_connect(struct sock *sk, struct sockaddr *addr, int addr_len);
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int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *addr,
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int addr_len);
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int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr);
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void ip6_datagram_release_cb(struct sock *sk);
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int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len,
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int *addr_len);
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@ -119,6 +119,26 @@ out:
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return err;
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}
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void ip6_datagram_release_cb(struct sock *sk)
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{
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struct dst_entry *dst;
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if (ipv6_addr_v4mapped(&sk->sk_v6_daddr))
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return;
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rcu_read_lock();
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dst = __sk_dst_get(sk);
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if (!dst || !dst->obsolete ||
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dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) {
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rcu_read_unlock();
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return;
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}
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rcu_read_unlock();
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ip6_datagram_dst_update(sk, false);
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}
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EXPORT_SYMBOL_GPL(ip6_datagram_release_cb);
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static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
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{
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struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
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@ -1539,6 +1539,7 @@ struct proto udpv6_prot = {
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.sendmsg = udpv6_sendmsg,
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.recvmsg = udpv6_recvmsg,
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.backlog_rcv = __udpv6_queue_rcv_skb,
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.release_cb = ip6_datagram_release_cb,
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.hash = udp_lib_hash,
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.unhash = udp_lib_unhash,
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.rehash = udp_v6_rehash,
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