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authorEric Dumazet <edumazet@google.com>2023-09-12 16:02:11 +0000
committerDavid S. Miller <davem@davemloft.net>2023-09-15 10:33:48 +0100
commit6b724bc4300b431443f3b99520994a5aece347cd (patch)
tree02730c15dc86341705749df48ed87b7ca84688c1 /include/linux/ipv6.h
parent83cd5eb654b320c1972254f243531f3f3cebcccf (diff)
ipv6: lockless IPV6_MTU_DISCOVER implementation
Most np->pmtudisc reads are racy. Move this 3bit field on a full byte, add annotations and make IPV6_MTU_DISCOVER setsockopt() lockless. 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/linux/ipv6.h')
-rw-r--r--include/linux/ipv6.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h
index f288a35f157f..10f521a6a9c8 100644
--- a/include/linux/ipv6.h
+++ b/include/linux/ipv6.h
@@ -243,13 +243,12 @@ struct ipv6_pinfo {
} rxopt;
/* sockopt flags */
- __u16 sndflow:1,
- pmtudisc:3,
- padding:1, /* 1 bit hole */
+ __u8 sndflow:1,
srcprefs:3; /* 001: prefer temporary address
* 010: prefer public address
* 100: prefer care-of address
*/
+ __u8 pmtudisc;
__u8 min_hopcount;
__u8 tclass;
__be32 rcv_flowinfo;