[openssl/openssl] b93161: Gate use of IPV6_PMTUDISC_PROBE on it being defined

[Neil Horman]

Branch: refs/heads/openssl-3.3
Home: https://github.com/openssl/openssl
Commit: b93161ed20a1b6fa24eb6cdeb8ffb349d79a7c82
https://github.com/openssl/openssl/commit/b93161ed20a1b6fa24eb6cdeb8ffb349d79a7c82
Author: Neil Horman <nho...@openssl.org>
Date: 2026-02-04 (Wed, 04 Feb 2026)

Changed paths:
M crypto/bio/bss_dgram.c

Log Message:
-----------
Gate use of IPV6_PMTUDISC_PROBE on it being defined

We accidentally introduced a use of IPV6_PMTUDISC_PROBE without checking
if it was defined in
https://github.com/openssl/openssl/pull/28809

leading to build failures on systems that don't define it. Fix that.

Fixes #29903

Reviewed-by: Eugene Syromiatnikov <es...@openssl.org>
Reviewed-by: Saša Nedvědický <sas...@openssl.org>
MergeDate: Wed Feb 4 19:23:14 2026
(Merged from https://github.com/openssl/openssl/pull/29927)

(cherry picked from commit b00fae4ef89a4926f9122d1cf18cc26a9e8c213f)



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