From 2da23eb07c91241d962f3ff05565065484cd8929 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Tue, 12 Sep 2023 16:02:01 +0000 Subject: 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 Reviewed-by: David Ahern Signed-off-by: David S. Miller --- include/net/ipv6.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'include/net/ipv6.h') 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) -- cgit v1.2.3