linux.git/include/net/ipv6.h, branch v6.12.80

ipv6: annotate data-races in ip6_multipath_hash_{policy,fields}()

2026-03-04T12:21:13+00:00

[ Upstream commit 03e9d91dd64e2f5ea632df5d59568d91757efc4d ]

Add missing READ_ONCE() when reading sysctl values.

Signed-off-by: Eric Dumazet 
Reviewed-by: Simon Horman 
Link: https://patch.msgid.link/20260115094141.3124990-5-edumazet@google.com
Signed-off-by: Jakub Kicinski 
Signed-off-by: Sasha Levin

ipv6: fix a race in ip6_sock_set_v6only()

2026-03-04T12:20:38+00:00

[ Upstream commit 452a3eee22c57a5786ae6db5c97f3b0ec13bb3b7 ]

It is unlikely that this function will be ever called
with isk->inet_num being not zero.

Perform the check on isk->inet_num inside the locked section
for complete safety.

Fixes: 9b115749acb24 ("ipv6: add ip6_sock_set_v6only")
Signed-off-by: Eric Dumazet 
Reviewed-by: Simon Horman 
Reviewed-by: Fernando Fernandez Mancera 
Link: https://patch.msgid.link/20260216102202.3343588-1-edumazet@google.com
Signed-off-by: Jakub Kicinski 
Signed-off-by: Sasha Levin

ipv6: replace ipcm6_init calls with ipcm6_init_sk

2025-06-27T10:11:41+00:00

commit 096208592b09c2f5fc0c1a174694efa41c04209d upstream.

This initializes tclass and dontfrag before cmsg parsing, removing the
need for explicit checks against -1 in each caller.

Leave hlimit set to -1, because its full initialization
(in ip6_sk_dst_hoplimit) requires more state (dst, flowi6, ..).

This also prepares for calling sockcm_init in a follow-on patch.

Signed-off-by: Willem de Bruijn 
Reviewed-by: David Ahern 
Link: https://patch.msgid.link/20250214222720.3205500-7-willemdebruijn.kernel@gmail.com
Signed-off-by: Jakub Kicinski 
Signed-off-by: Greg Kroah-Hartman

ipv6: Correct spelling in ipv6.h

2024-08-26T16:37:22+00:00

Correct spelling in ip_tunnels.h
As reported by codespell.

Cc: David Ahern 
Signed-off-by: Simon Horman 
Link: https://patch.msgid.link/20240822-net-spell-v1-4-3a98971ce2d2@kernel.org
Signed-off-by: Jakub Kicinski

ipv6: Add ipv6_addr_{cpu_to_be32,be32_to_cpu} helpers

2024-08-16T17:27:48+00:00

Add helpers to convert an ipv6 addr, expressed as an array
of words, from CPU to big-endian byte order, and vice versa.

No functional change intended.
Compile tested only.

Suggested-by: Andrew Lunn 
Link: https://lore.kernel.org/netdev/c7684349-535c-45a4-9a74-d47479a50020@lunn.ch/
Reviewed-by: Andrew Lunn 
Signed-off-by: Simon Horman 
Link: https://patch.msgid.link/20240813-ipv6_addr-helpers-v2-1-5c974f8cca3e@kernel.org
Signed-off-by: Jakub Kicinski

ipv6: annotate data-races around cnf.forwarding

2024-03-01T08:42:31+00:00

idev->cnf.forwarding and net->ipv6.devconf_all->forwarding
might be read locklessly, add appropriate READ_ONCE()
and WRITE_ONCE() annotations.

Signed-off-by: Eric Dumazet 
Reviewed-by: Jiri Pirko 
Signed-off-by: David S. Miller

tcp: Save v4 address as v4-mapped-v6 in inet_bind2_bucket.v6_rcv_saddr.

2023-12-22T22:15:34+00:00

In bhash2, IPv4/IPv6 addresses are saved in two union members,
which complicate address checks in inet_bind2_bucket_addr_match()
and inet_bind2_bucket_match_addr_any() considering uninitialised
memory and v4-mapped-v6 conflicts.

Let's simplify that by saving IPv4 address as v4-mapped-v6 address
and defining tb2.rcv_saddr as tb2.v6_rcv_saddr.s6_addr32[3].

Then, we can compare v6 address as is, and after checking v4-mapped-v6,
we can compare v4 address easily.  Also, we can remove tb2->family.

Note these functions will be further refactored in the next patch.

Signed-off-by: Kuniyuki Iwashima 
Reviewed-by: Eric Dumazet 
Signed-off-by: David S. Miller

ipv6: rename and move ip6_dst_lookup_tunnel()

2023-10-23T07:48:57+00:00

At the moment ip6_dst_lookup_tunnel() is used only by bareudp.
Ideally, other UDP tunnel implementations should use it, but to do so
the function needs to accept new parameters that are specific for UDP
tunnels, such as the ports.

Prepare for these changes by renaming the function to
udp_tunnel6_dst_lookup() and move it to file
net/ipv6/ip6_udp_tunnel.c.

This is similar to what already done for IPv4 in commit bf3fcbf7e7a0
("ipv4: rename and move ip_route_output_tunnel()").

Suggested-by: Guillaume Nault 
Signed-off-by: Beniamino Galvani 
Reviewed-by: David Ahern 
Signed-off-by: David S. Miller

ipv6: lockless IPV6_ADDR_PREFERENCES implementation

2023-09-19T16:21:44+00:00

We have data-races while reading np->srcprefs

Switch the field to a plain byte, add READ_ONCE()
and WRITE_ONCE() annotations where needed,
and IPV6_ADDR_PREFERENCES setsockopt() can now be lockless.

Signed-off-by: Eric Dumazet 
Reviewed-by: David Ahern 
Link: https://lore.kernel.org/r/20230918142321.1794107-1-edumazet@google.com
Signed-off-by: Paolo Abeni

ipv6: lockless IPV6_RECVERR implemetation

2023-09-15T09:33:48+00:00

np->recverr is moved to inet->inet_flags to fix data-races.

Signed-off-by: Eric Dumazet 
Reviewed-by: David Ahern 
Signed-off-by: David S. Miller