diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-09-22 03:42:14 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-10-01 19:39:18 +0100 |
| commit | c9746e6a19c24b2d9a74d6657daee3b39fdc1bec (patch) | |
| tree | 0c4c1653ac642f05004c576ce39640e3cc055011 /net/ipv4/ip_sockglue.c | |
| parent | 2be825ebb9d1b17f1a9e46af78d24b76c4ff7a1f (diff) | |
inet: implement lockless IP_MULTICAST_TTL
inet->mc_ttl can be read locklessly.
Implement proper lockless reads and writes to inet->mc_ttl
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
| -rw-r--r-- | net/ipv4/ip_sockglue.c | 31 |
1 files changed, 16 insertions, 15 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index cce9cb25f3b3..4ad3003378ae 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -1039,6 +1039,17 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname, WRITE_ONCE(inet->min_ttl, val); return 0; + case IP_MULTICAST_TTL: + if (sk->sk_type == SOCK_STREAM) + return -EINVAL; + if (optlen < 1) + return -EINVAL; + if (val == -1) + val = 1; + if (val < 0 || val > 255) + return -EINVAL; + WRITE_ONCE(inet->mc_ttl, val); + return 0; } err = 0; @@ -1101,17 +1112,6 @@ int do_ip_setsockopt(struct sock *sk, int level, int optname, goto e_inval; inet->pmtudisc = val; break; - case IP_MULTICAST_TTL: - if (sk->sk_type == SOCK_STREAM) - goto e_inval; - if (optlen < 1) - goto e_inval; - if (val == -1) - val = 1; - if (val < 0 || val > 255) - goto e_inval; - inet->mc_ttl = val; - break; case IP_UNICAST_IF: { struct net_device *dev = NULL; @@ -1592,6 +1592,9 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, case IP_MINTTL: val = READ_ONCE(inet->min_ttl); goto copyval; + case IP_MULTICAST_TTL: + val = READ_ONCE(inet->mc_ttl); + goto copyval; } if (needs_rtnl) @@ -1649,9 +1652,6 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, } break; } - case IP_MULTICAST_TTL: - val = inet->mc_ttl; - break; case IP_UNICAST_IF: val = (__force int)htonl((__u32) inet->uc_index); break; @@ -1718,7 +1718,8 @@ int do_ip_getsockopt(struct sock *sk, int level, int optname, put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info); } if (inet_test_bit(TTL, sk)) { - int hlim = inet->mc_ttl; + int hlim = READ_ONCE(inet->mc_ttl); + put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim); } if (inet_test_bit(TOS, sk)) { |