[NETNS][IPV6] tcp6 - handle several network namespace

We have the right network namespace at the right place now.
So make use of this information to make tcp6 per network namespace

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: Benjamin Thery <benjamin.thery@bull.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 8 insertions, 6 deletions

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 7954b4e99c4f..caf0cc1c00e1 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -988,6 +988,8 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
         struct tcphdr *th = tcp_hdr(skb), *t1;
         struct sk_buff *buff;
         struct flowi fl;
+        struct net *net = skb->dst->dev->nd_net;
+        struct sock *ctl_sk = net->ipv6.tcp_sk;
         unsigned int tot_len = sizeof(*th);
 #ifdef CONFIG_TCP_MD5SIG
         struct tcp_md5sig_key *key;
@@ -1072,11 +1074,10 @@ static void tcp_v6_send_reset(struct sock *sk, struct sk_buff *skb)
          * Underlying function will use this to retrieve the network
          * namespace
          */
-        if (!ip6_dst_lookup(init_net.ipv6.tcp_sk, &buff->dst, &fl)) {
+        if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
 
                 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
-                        ip6_xmit(init_net.ipv6.tcp_sk,
-                                 buff, &fl, NULL, 0);
+                        ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
                         TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
                         TCP_INC_STATS_BH(TCP_MIB_OUTRSTS);
                         return;
@@ -1092,6 +1093,8 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
         struct tcphdr *th = tcp_hdr(skb), *t1;
         struct sk_buff *buff;
         struct flowi fl;
+        struct net *net = skb->dev->nd_net;
+        struct sock *ctl_sk = net->ipv6.tcp_sk;
         unsigned int tot_len = sizeof(struct tcphdr);
         __be32 *topt;
 #ifdef CONFIG_TCP_MD5SIG
@@ -1173,10 +1176,9 @@ static void tcp_v6_send_ack(struct tcp_timewait_sock *tw,
         fl.fl_ip_sport = t1->source;
         security_skb_classify_flow(skb, &fl);
 
-        if (!ip6_dst_lookup(init_net.ipv6.tcp_sk, &buff->dst, &fl)) {
+        if (!ip6_dst_lookup(ctl_sk, &buff->dst, &fl)) {
                 if (xfrm_lookup(&buff->dst, &fl, NULL, 0) >= 0) {
-                        ip6_xmit(init_net.ipv6.tcp_sk,
-                                 buff, &fl, NULL, 0);
+                        ip6_xmit(ctl_sk, buff, &fl, NULL, 0);
                         TCP_INC_STATS_BH(TCP_MIB_OUTSEGS);
                         return;
                 }