icmp: Limit routing table updates to the FIB of the redirectHEADmain

When we receive an ICMP redirect, rib_add_redirect() is used to apply
the redirect to all FIBs.  This has been the case since support for
multiple FIBs was added.  However, it seems rather dubious: the new
gateway might not be routable from all FIBs, and the validation done for
v4 redirects in icmp_verify_redirect_gateway() is only applied to the
FIB from which the redirect originated.

Modify the handler to apply the redirect only in the originating FIB.

Reported by:	Yuxiang Yang, Yizhou Zhao, Ao Wang, Xuewei Feng, Qi Li,
		and Ke Xu from Tsinghua University using GLM-5.1 from Z.ai
Reviewed by:	pouria, zlei, glebius, melifaro
MFC after:	3 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D59567

0 files changed, 0 insertions, 0 deletions