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inet: collapse ipv4/v6 rcv_saddr_equal functions into one

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We pass these per-protocol equal functions around in various places, but
we can just have one function that checks the sk->sk_family and then do
the right comparison function.  I've also changed the ipv4 version to
not cast to inet_sock since it is unneeded.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Josef Bacik
2017-01-17 07:51:01 -08:00
committed by David S. Miller
parent ab70e58626
commit fe38d2a1c8
9 changed files with 95 additions and 113 deletions
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46
net/ipv6/inet6_hashtables.c
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@ -268,54 +268,10 @@ int inet6_hash(struct sock *sk)
if (sk->sk_state != TCP_CLOSE) {
local_bh_disable();
err = __inet_hash(sk, NULL, ipv6_rcv_saddr_equal);
err = __inet_hash(sk, NULL);
local_bh_enable();
}
return err;
}
EXPORT_SYMBOL_GPL(inet6_hash);
/* match_wildcard == true: IPV6_ADDR_ANY equals to any IPv6 addresses if IPv6
* only, and any IPv4 addresses if not IPv6 only
* match_wildcard == false: addresses must be exactly the same, i.e.
* IPV6_ADDR_ANY only equals to IPV6_ADDR_ANY,
* and 0.0.0.0 equals to 0.0.0.0 only
*/
int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2,
bool match_wildcard)
{
const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2);
int sk2_ipv6only = inet_v6_ipv6only(sk2);
int addr_type = ipv6_addr_type(&sk->sk_v6_rcv_saddr);
int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED;
/* if both are mapped, treat as IPv4 */
if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) {
if (!sk2_ipv6only) {
if (sk->sk_rcv_saddr == sk2->sk_rcv_saddr)
return 1;
if (!sk->sk_rcv_saddr || !sk2->sk_rcv_saddr)
return match_wildcard;
}
return 0;
}
if (addr_type == IPV6_ADDR_ANY && addr_type2 == IPV6_ADDR_ANY)
return 1;
if (addr_type2 == IPV6_ADDR_ANY && match_wildcard &&
!(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED))
return 1;
if (addr_type == IPV6_ADDR_ANY && match_wildcard &&
!(ipv6_only_sock(sk) && addr_type2 == IPV6_ADDR_MAPPED))
return 1;
if (sk2_rcv_saddr6 &&
ipv6_addr_equal(&sk->sk_v6_rcv_saddr, sk2_rcv_saddr6))
return 1;
return 0;
}
EXPORT_SYMBOL_GPL(ipv6_rcv_saddr_equal);