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tcp: metrics: Handle v6/v4-mapped sockets in tcp-metrics 

A socket may be v6/v4-mapped. In that case sk->sk_family is AF_INET6,
but the IP being used is actually an IPv4-address.
Current's tcp-metrics will thus represent it as an IPv6-address:

root@server:~# ip tcp_metrics
::ffff:10.1.1.2 age 22.920sec rtt 18750us rttvar 15000us cwnd 10
10.1.1.2 age 47.970sec rtt 16250us rttvar 10000us cwnd 10

This patch modifies the tcp-metrics so that they are able to handle the
v6/v4-mapped sockets correctly.

Signed-off-by: Christoph Paasch <christoph.paasch@uclouvain.be>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Paasch 2014-01-22 13:58:44 +01:00 committed by David S. Miller
parent 5ae5e991ee
commit 3ad88cf70a
1 changed files with 44 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

72
net/ipv4/tcp_metrics.c
View File

@ -274,24 +274,32 @@ static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock
unsigned int hash;
struct net *net;
saddr.family = tw->tw_family;
daddr.family = tw->tw_family;
switch (daddr.family) {
case AF_INET:
if (tw->tw_family == AF_INET) {
saddr.family = AF_INET;
saddr.addr.a4 = tw->tw_rcv_saddr;
daddr.family = AF_INET;
daddr.addr.a4 = tw->tw_daddr;
hash = (__force unsigned int) daddr.addr.a4;
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
*(struct in6_addr *)saddr.addr.a6 = tw->tw_v6_rcv_saddr;
*(struct in6_addr *)daddr.addr.a6 = tw->tw_v6_daddr;
hash = ipv6_addr_hash(&tw->tw_v6_daddr);
break;
#endif
default:
return NULL;
}
#if IS_ENABLED(CONFIG_IPV6)
else if (tw->tw_family == AF_INET6) {
if (ipv6_addr_v4mapped(&tw->tw_v6_daddr)) {
saddr.family = AF_INET;
saddr.addr.a4 = tw->tw_rcv_saddr;
daddr.family = AF_INET;
daddr.addr.a4 = tw->tw_daddr;
hash = (__force unsigned int) daddr.addr.a4;
} else {
saddr.family = AF_INET6;
*(struct in6_addr *)saddr.addr.a6 = tw->tw_v6_rcv_saddr;
daddr.family = AF_INET6;
*(struct in6_addr *)daddr.addr.a6 = tw->tw_v6_daddr;
hash = ipv6_addr_hash(&tw->tw_v6_daddr);
}
}
#endif
else
return NULL;
net = twsk_net(tw);
hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);
@ -314,24 +322,32 @@ static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk,
unsigned int hash;
struct net *net;
saddr.family = sk->sk_family;
daddr.family = sk->sk_family;
switch (daddr.family) {
case AF_INET:
if (sk->sk_family == AF_INET) {
saddr.family = AF_INET;
saddr.addr.a4 = inet_sk(sk)->inet_saddr;
daddr.family = AF_INET;
daddr.addr.a4 = inet_sk(sk)->inet_daddr;
hash = (__force unsigned int) daddr.addr.a4;
break;
#if IS_ENABLED(CONFIG_IPV6)
case AF_INET6:
*(struct in6_addr *)saddr.addr.a6 = sk->sk_v6_rcv_saddr;
*(struct in6_addr *)daddr.addr.a6 = sk->sk_v6_daddr;
hash = ipv6_addr_hash(&sk->sk_v6_daddr);
break;
#endif
default:
return NULL;
}
#if IS_ENABLED(CONFIG_IPV6)
else if (sk->sk_family == AF_INET6) {
if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) {
saddr.family = AF_INET;
saddr.addr.a4 = inet_sk(sk)->inet_saddr;
daddr.family = AF_INET;
daddr.addr.a4 = inet_sk(sk)->inet_daddr;
hash = (__force unsigned int) daddr.addr.a4;
} else {
saddr.family = AF_INET6;
*(struct in6_addr *)saddr.addr.a6 = sk->sk_v6_rcv_saddr;
daddr.family = AF_INET6;
*(struct in6_addr *)daddr.addr.a6 = sk->sk_v6_daddr;
hash = ipv6_addr_hash(&sk->sk_v6_daddr);
}
}
#endif
else
return NULL;
net = dev_net(dst->dev);
hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);