linux-toradex.git/include/net/ipv6.h, branch v7.0-rc6

ipv6: fix a race in ip6_sock_set_v6only()

2026-02-18T00:45:29+00:00

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

net/ipv6: Remove HBH helpers

2026-02-07T04:50:13+00:00

Now that the HBH jumbo helpers are not used by any driver or GSO, remove
them altogether.

Signed-off-by: Alice Mikityanska 
Acked-by: Paolo Abeni 
Reviewed-by: Eric Dumazet 
Link: https://patch.msgid.link/20260205133925.526371-13-alice.kernel@fastmail.im
Signed-off-by: Jakub Kicinski

net/ipv6: Introduce payload_len helpers

2026-02-07T04:50:03+00:00

The next commits will transition away from using the hop-by-hop
extension header to encode packet length for BIG TCP. Add wrappers
around ip6->payload_len that return the actual value if it's non-zero,
and calculate it from skb->len if payload_len is set to zero (and a
symmetrical setter).

The new helpers are used wherever the surrounding code supports the
hop-by-hop jumbo header for BIG TCP IPv6, or the corresponding IPv4 code
uses skb_ip_totlen (e.g., in include/net/netfilter/nf_tables_ipv6.h).

No behavioral change in this commit.

Signed-off-by: Alice Mikityanska 
Acked-by: Paolo Abeni 
Reviewed-by: Eric Dumazet 
Link: https://patch.msgid.link/20260205133925.526371-2-alice.kernel@fastmail.im
Signed-off-by: Jakub Kicinski

ipv6: colocate inet6_cork in inet_cork_full

2026-02-03T01:49:30+00:00

All inet6_cork users also use one inet_cork_full.

Reduce number of parameters and increase data locality.

This saves ~275 bytes of code on x86_64.

Signed-off-by: Eric Dumazet 
Reviewed-by: Kuniyuki Iwashima 
Link: https://patch.msgid.link/20260130210303.3888261-9-edumazet@google.com
Signed-off-by: Jakub Kicinski

ipv6: pass proto by value to ipv6_push_nfrag_opts() and ipv6_push_frag_opts()

2026-02-03T01:49:28+00:00

With CONFIG_STACKPROTECTOR_STRONG=y, it is better to avoid passing
a pointer to an automatic variable.

Change these exported functions to return 'u8 proto'
instead of void.

- ipv6_push_nfrag_opts()
- ipv6_push_frag_opts()

For instance, replace
	ipv6_push_frag_opts(skb, opt, &proto);
with:
	proto = ipv6_push_frag_opts(skb, opt, proto);

Note that even after this change, ip6_xmit() has to use a stack canary
because of @first_hop variable.

Signed-off-by: Eric Dumazet 
Reviewed-by: Kuniyuki Iwashima 
Link: https://patch.msgid.link/20260130210303.3888261-2-edumazet@google.com
Signed-off-by: Jakub Kicinski

ipv6: optimize fl6_update_dst()

2026-01-30T02:47:21+00:00

fl6_update_dst() is called for every TCP (and others) transmit,
and is a nop for common cases.

Split it in two parts :

1) fl6_update_dst() inline helper, small and fast.

2) __fl6_update_dst() for the exception, out of line.

Small size increase to get better TX performance.

$ scripts/bloat-o-meter -t vmlinux.old vmlinux.new
add/remove: 2/2 grow/shrink: 8/0 up/down: 296/-125 (171)
Function                                     old     new   delta
__fl6_update_dst                               -     104    +104
rawv6_sendmsg                               2244    2284     +40
udpv6_sendmsg                               3013    3043     +30
tcp_v6_connect                              1514    1534     +20
cookie_v6_check                             1501    1519     +18
ip6_datagram_dst_update                      673     690     +17
inet6_sk_rebuild_header                      499     516     +17
inet6_csk_route_socket                       507     524     +17
inet6_csk_route_req                          343     360     +17
__pfx___fl6_update_dst                         -      16     +16
__pfx_fl6_update_dst                          16       -     -16
fl6_update_dst                               109       -    -109
Total: Before=22570304, After=22570475, chg +0.00%

Signed-off-by: Eric Dumazet 
Link: https://patch.msgid.link/20260128185548.3738781-1-edumazet@google.com
Signed-off-by: Jakub Kicinski

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

2026-01-19T17:56:42+00:00

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

ipv6: annotate date-race in ipv6_can_nonlocal_bind()

2026-01-19T17:56:42+00:00

Add a missing READ_ONCE(), and add const qualifiers to the two parameters.

Signed-off-by: Eric Dumazet 
Reviewed-by: Simon Horman 
Link: https://patch.msgid.link/20260115094141.3124990-4-edumazet@google.com
Signed-off-by: Jakub Kicinski

ipv6: annotate data-races from ip6_make_flowlabel()

2026-01-19T17:56:42+00:00

Use READ_ONCE() to read sysctl values in ip6_make_flowlabel()
and ip6_make_flowlabel()

Add a const qualifier to 'struct net' parameters.

Signed-off-by: Eric Dumazet 
Reviewed-by: Simon Horman 
Link: https://patch.msgid.link/20260115094141.3124990-3-edumazet@google.com
Signed-off-by: Jakub Kicinski

net: Convert proto callbacks from sockaddr to sockaddr_unsized

2025-11-05T03:10:33+00:00

Convert struct proto pre_connect(), connect(), bind(), and bind_add()
callback function prototypes from struct sockaddr to struct sockaddr_unsized.
This does not change per-implementation use of sockaddr for passing around
an arbitrarily sized sockaddr struct. Those will be addressed in future
patches.

Additionally removes the no longer referenced struct sockaddr from
include/net/inet_common.h.

No binary changes expected.

Signed-off-by: Kees Cook 
Link: https://patch.msgid.link/20251104002617.2752303-5-kees@kernel.org
Signed-off-by: Jakub Kicinski