ip6mr: Use MAXMIFS in mr6_msgsize().

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mr6_msgsize() calculates skb size needed for ip6mr_fill_mroute().

The size differs based on mrt->maxvif.

We will drop RTNL for ip6mr_rtm_getroute() and mrt->maxvif may
change under RCU.

To avoid -EMSGSIZE, let's calculate the size with the maximum
value of mrt->maxvif, MAXMIFS.

struct rtnexthop is 8 bytes and MAXMIFS is 32, so the maximum delta
is 256 bytes, which is small enough.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260604224712.3209821-4-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Kuniyuki Iwashima 2026-06-04 22:46:21 +00:00 • committed by Jakub Kicinski

parent 364568de4e

commit 36be7d7c5d

1 changed files with 4 additions and 5 deletions

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net/ipv6/ip6mr.c

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