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[UDP]: Do not allow specific bind when wildcard bind exists. 

When allocating local ports, do not allow a bind to a port
with a specific local address when a bind to that port with
a wildcard local address already exists.

Noticed by Linus.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2007-04-30 14:51:58 -07:00
parent b7b5f487ab
commit de34ed91c4
1 changed files with 33 additions and 8 deletions
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41
net/ipv4/udp.c
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@ -203,6 +203,13 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
result = sysctl_local_port_range[0]
+ ((result - sysctl_local_port_range[0]) &
(UDP_HTABLE_SIZE - 1));
hash = hash_port_and_addr(result, 0);
if (__udp_lib_port_inuse(hash, result,
0, udptable))
continue;
if (!inet_sk(sk)->rcv_saddr)
break;
hash = hash_port_and_addr(result,
inet_sk(sk)->rcv_saddr);
if (! __udp_lib_port_inuse(hash, result,
@ -214,18 +221,36 @@ int __udp_lib_get_port(struct sock *sk, unsigned short snum,
gotit:
*port_rover = snum = result;
} else {
hash = hash_port_and_addr(snum, inet_sk(sk)->rcv_saddr);
hash = hash_port_and_addr(snum, 0);
head = &udptable[hash & (UDP_HTABLE_SIZE - 1)];
sk_for_each(sk2, node, head)
if (sk2->sk_hash == hash &&
sk2 != sk &&
inet_sk(sk2)->num == snum &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
|| sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(*saddr_comp)(sk, sk2) )
if (sk2->sk_hash == hash &&
sk2 != sk &&
inet_sk(sk2)->num == snum &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(*saddr_comp)(sk, sk2))
goto fail;
if (inet_sk(sk)->rcv_saddr) {
hash = hash_port_and_addr(snum,
inet_sk(sk)->rcv_saddr);
head = &udptable[hash & (UDP_HTABLE_SIZE - 1)];
sk_for_each(sk2, node, head)
if (sk2->sk_hash == hash &&
sk2 != sk &&
inet_sk(sk2)->num == snum &&
(!sk2->sk_reuse || !sk->sk_reuse) &&
(!sk2->sk_bound_dev_if ||
!sk->sk_bound_dev_if ||
sk2->sk_bound_dev_if ==
sk->sk_bound_dev_if) &&
(*saddr_comp)(sk, sk2))
goto fail;
}
}
inet_sk(sk)->num = snum;
sk->sk_hash = hash;