diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/ipv6_sockglue.c | 6 | ||||
| -rw-r--r-- | net/ipv6/tcp_ipv6.c | 21 |
2 files changed, 19 insertions, 8 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 9c3d28764b5c..41efca817db4 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -55,6 +55,8 @@ struct ip6_ra_chain *ip6_ra_chain; DEFINE_RWLOCK(ip6_ra_lock); +DEFINE_STATIC_KEY_FALSE(ip6_min_hopcount); + int ip6_ra_control(struct sock *sk, int sel) { struct ip6_ra_chain *ra, *new_ra, **rap; @@ -950,6 +952,10 @@ done: goto e_inval; if (val < 0 || val > 255) goto e_inval; + + if (val) + static_branch_enable(&ip6_min_hopcount); + /* tcp_v6_err() and tcp_v6_rcv() might read min_hopcount * while we are changing it. */ diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c index c93b2d48bb89..6945583c0fa4 100644 --- a/net/ipv6/tcp_ipv6.c +++ b/net/ipv6/tcp_ipv6.c @@ -414,10 +414,12 @@ static int tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, if (sk->sk_state == TCP_CLOSE) goto out; - /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ - if (ipv6_hdr(skb)->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { - __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); - goto out; + if (static_branch_unlikely(&ip6_min_hopcount)) { + /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ + if (ipv6_hdr(skb)->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { + __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); + goto out; + } } tp = tcp_sk(sk); @@ -1727,10 +1729,13 @@ process: return 0; } } - /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ - if (hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { - __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); - goto discard_and_relse; + + if (static_branch_unlikely(&ip6_min_hopcount)) { + /* min_hopcount can be changed concurrently from do_ipv6_setsockopt() */ + if (hdr->hop_limit < READ_ONCE(tcp_inet6_sk(sk)->min_hopcount)) { + __NET_INC_STATS(net, LINUX_MIB_TCPMINTTLDROP); + goto discard_and_relse; + } } if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |