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Default branch: MAIN
Current tag: fvdl-softdep
Revision 184.108.40.206 / (download) - annotate - [select for diffs], Mon Nov 15 00:42:13 1999 UTC (16 years, 11 months ago) by fvdl
Changes since 1.93: +6 -1 lines
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Revision 1.93 / (download) - annotate - [select for diffs], Sun Oct 17 16:00:00 1999 UTC (17 years ago) by sommerfeld
Branch point for: thorpej_scsipi, fvdl-softdep
Changes since 1.92: +2 -2 lines
Diff to previous 1.92 (colored)
In ip_forward(): Avoid forwarding ip unicast packets which were contained inside link-level multicast packets; having M_MCAST still set in the packet header flags will mean that the packet will get multicast to a bogus group instead of unicast to the next hop. Malformed packets like this have occasionally been spotted "in the wild" on a mediaone cable modem segment which also had multiple netbsd machines running as router/NAT boxes. Without this, any subnet with multiple netbsd routers receiving all multicasts will generate a packet storm on receipt of such a multicast. Note that we already do the same check here for link-level broadcasts; ip6_forward already does this as well. Note that multicast forwarding does not go through ip_forward(). Adding some code to if_ethersubr to sanity check link-level vs. ip-level multicast addresses might also be worthwhile.
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