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authorDavid Gwynne <dlg@cvs.openbsd.org>2011-04-19 03:47:30 +0000
committerDavid Gwynne <dlg@cvs.openbsd.org>2011-04-19 03:47:30 +0000
commitce66a6feadb58e1c9ca87d6c2ab35f9c3fcf7b47 (patch)
treed180490bc1c223d08b0337570e68068f9af58b05 /sys/lib/libkern/adddi3.c
parent47007d8bc8fd6b1e274d680e4a82815912162e2b (diff)
reintroduce using the RB tree for local address lookups. this is
confusing because both addresses and broadcast addresses are put into the tree. there are two types of local address lookup. the first is when the socket layer wants a local address, the second is in ip_input when the kernel is figuring out the packet is for it to process or forward. ip_input considers local addresses and broadcast addresses as local, however, the handling of broadcast addresses is different depending on whether ip_directedbcast is set. if if ip_directbcast is unset then a packet coming in on any interface to any of the systems broadcast addresses is considered local, otherwise the broadcast packet must exist on the interface it was received on. the code also needs to consider classful broadcast addresses so we can continue some legacy applications (eg, netbooting old sparcs that use rarp and bootparam requests to classful broadcast addresses as per PR6382). this diff maintains that support, but restricts it to packets that are broadcast on the link layer (eg, ethernet broadcasted packets), and it only looks up addresses on the local interface. we now only support classful broadcast addresses on local interfaces to avoid weird side effects with packets routed to us. the ip4 socket layer does lookups for local addresses with a wrapper around the global address tree that rejects matches against broadcast addresses. we now no longer support bind sockets to broadcast addresses, no matter what the value of ip_directedbcast is. ok henning@ testing (and possibly ok) claudio@
Diffstat (limited to 'sys/lib/libkern/adddi3.c')
0 files changed, 0 insertions, 0 deletions