ipv6: Remove IPV6_ADDRFORM.

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Recently, IPV6_ADDRFORM has received many AI-driven bug reports.
Fixing them properly would needlessly churn the fast paths in TCP
and UDP.

IPV6_ADDRFORM was initially introduced in RFC 2133 in 1997,
but only two years later, it was removed from RFC 2553 in 1999.

In 2026, modern applications natively support dual-stack sockets;
notably, systemd's socket activation does not use IPV6_ADDRFORM.

Also, getsockopt(IPV6_ADDRFORM) can be replaced with SO_DOMAIN.

Let's remove IPV6_ADDRFORM.

Later, we can remove sk->sk_prot_creator and revert commit
c26c192c3d ("udp: properly deal with xfrm encap and ADDRFORM").

Reported-by: Daehyeon Ko <4ncienth@gmail.com>
Closes: https://lore.kernel.org/netdev/20260902010408.1057857-1-4ncienth@gmail.com/
Reported-by: Hyunwoo Kim <imv4bel@gmail.com>
Closes: https://lore.kernel.org/netdev/20260824033331.1084971-1-imv4bel@gmail.com/
Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260904033543.2635540-3-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

...

This commit is contained in:

Kuniyuki Iwashima 2026-09-04 03:35:29 +00:00 • committed by Jakub Kicinski

parent 8cc3aef0cb

commit 31c5ea8a32

5 changed files with 2 additions and 98 deletions

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2

include/linux/net.h

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4

net/core/sock.c

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3

net/ipv4/af_inet.c

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4

net/ipv6/af_inet6.c

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87

net/ipv6/ipv6_sockglue.c

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