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>
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c
index 9ae48b4..d547075 100644
--- a/net/ipv4/tcp_metrics.c
+++ b/net/ipv4/tcp_metrics.c
@@ -274,24 +274,32 @@
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 @@
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);