diff options
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index b297bb28556e..38d29b175ca6 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -886,6 +886,8 @@ static int compat_ip_mcast_join_leave(struct sock *sk, int optname, return ip_mc_leave_group(sk, &mreq); } +DEFINE_STATIC_KEY_FALSE(ip4_min_ttl); + static int do_ip_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, unsigned int optlen) { @@ -1352,7 +1354,14 @@ static int do_ip_setsockopt(struct sock *sk, int level, int optname, goto e_inval; if (val < 0 || val > 255) goto e_inval; - inet->min_ttl = val; + + if (val) + static_branch_enable(&ip4_min_ttl); + + /* tcp_v4_err() and tcp_v4_rcv() might read min_ttl + * while we are changint it. + */ + WRITE_ONCE(inet->min_ttl, val); break; default: |