[SOCK]: Add some notes about per-bind-bucket sock lookup.
I was asked about "why don't we perform a sk_net filtering in bind_conflict calls, like we do in other sock lookup places" for a couple of times. Can we please add a comment about why we do not need one? Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -55,6 +55,13 @@ int inet_csk_bind_conflict(const struct sock *sk,
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struct hlist_node *node;
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int reuse = sk->sk_reuse;
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/*
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* Unlike other sk lookup places we do not check
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* for sk_net here, since _all_ the socks listed
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* in tb->owners list belong to the same net - the
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* one this bucket belongs to.
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*/
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sk_for_each_bound(sk2, node, &tb->owners) {
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if (sk != sk2 &&
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!inet_v6_ipv6only(sk2) &&
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@ -33,6 +33,10 @@ int inet6_csk_bind_conflict(const struct sock *sk,
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const struct hlist_node *node;
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/* We must walk the whole port owner list in this case. -DaveM */
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/*
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* See comment in inet_csk_bind_conflict about sock lookup
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* vs net namespaces issues.
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*/
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sk_for_each_bound(sk2, node, &tb->owners) {
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if (sk != sk2 &&
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(!sk->sk_bound_dev_if ||
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