diff options
| author | Eric Dumazet <edumazet@google.com> | 2023-09-12 18:02:01 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2023-09-15 11:33:46 +0200 |
| commit | 2da23eb07c91241d962f3ff05565065484cd8929 (patch) | |
| tree | 921417255db7f2389304c5f21aac9c828b58caa8 /include/net/ipv6.h | |
| parent | ipv6: lockless IPV6_MULTICAST_LOOP implementation (diff) | |
| download | linux-2da23eb07c91241d962f3ff05565065484cd8929.tar.xz linux-2da23eb07c91241d962f3ff05565065484cd8929.zip | |
ipv6: lockless IPV6_MULTICAST_HOPS implementation
This fixes data-races around np->mcast_hops,
and make IPV6_MULTICAST_HOPS lockless.
Note that np->mcast_hops is never negative,
thus can fit an u8 field instead of s16.
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 'include/net/ipv6.h')
| -rw-r--r-- | include/net/ipv6.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/net/ipv6.h b/include/net/ipv6.h index 2e8e7e31e02e..8a04a8985336 100644 --- a/include/net/ipv6.h +++ b/include/net/ipv6.h @@ -914,7 +914,7 @@ static inline int ip6_sk_dst_hoplimit(struct ipv6_pinfo *np, struct flowi6 *fl6, int hlimit; if (ipv6_addr_is_multicast(&fl6->daddr)) - hlimit = np->mcast_hops; + hlimit = READ_ONCE(np->mcast_hops); else hlimit = READ_ONCE(np->hop_limit); if (hlimit < 0) |