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s-private-remove&id=b08d46b01e995dd7b653b22d35bd1d958d6ee9b4'>b08d46b01e995dd7b653b22d35bd1d958d6ee9b4 (diff)parent51ce8bd4d17a761e1a90a34a1b5c9b762cce7553 (diff)
Merge branch 'replace-dst_confirm'
Julian Anastasov says: ==================== net: dst_confirm replacement This patchset addresses the problem of neighbour confirmation where received replies from one nexthop can cause confirmation of different nexthop when using the same dst. Thanks to YueHaibing <yuehaibing@huawei.com> for tracking the dst->pending_confirm problem. Sockets can obtain cached output route. Such routes can be to known nexthop (rt_gateway=IP) or to be used simultaneously for different nexthop IPs by different subnet prefixes (nh->nh_scope = RT_SCOPE_HOST, rt_gateway=0). At first look, there are more problems: - dst_confirm() sets flag on dst and not on dst->path, as result, indication is lost when XFRM is used - DNAT can change the nexthop, so the really used nexthop is not confirmed So, the following solution is to avoid using dst->pending_confirm. The current dst_confirm() usage is as follows: Protocols confirming dst on received packets: - TCP (1 dst per socket) - SCTP (1 dst per transport) - CXGB* Protocols supporting sendmsg with MSG_CONFIRM [ | MSG_PROBE ] to confirm neighbour: - UDP IPv4/IPv6 - ICMPv4 PING - RAW IPv4/IPv6 - L2TP/IPv6 MSG_CONFIRM for other purposes (fix not needed): - CAN Sending without locking the socket: - UDP (when no cork) - RAW (when hdrincl=1) Redirects from old to new GW: - rt6_do_redirect The patchset includes the following changes: 1. sock: add sk_dst_pending_confirm flag - used only by TCP with patch 4 to remember the received indication in sk->sk_dst_pending_confirm 2. net: add dst_pending_confirm flag to skbuff - skb->dst_pending_confirm will be used by all protocols in following patches, via skb_{set,get}_dst_pending_confirm 3. sctp: add dst_pending_confirm flag - SCTP uses per-transport dsts and can not use sk->sk_dst_pending_confirm like TCP 4. tcp: replace dst_confirm with sk_dst_confirm 5. net: add confirm_neigh method to dst_ops - IPv4 and IPv6 provision for slow neigh lookups for MSG_PROBE users. I decided to use neigh lookup only for this case because on MSG_PROBE the skb may pass MTU checks but it does not reach the neigh confirmation code. This patch will be used from patch 6. - xfrm_confirm_neigh: we use the last tunnel address, if present. When there are only transports, the original dest address is used. 6. net: use dst_confirm_neigh for UDP, RAW, ICMP, L2TP - dst_confirm conversion for UDP, RAW, ICMP and L2TP/IPv6 - these protocols use MSG_CONFIRM propagated by ip*_append_data to skb->dst_pending_confirm. sk->sk_dst_pending_confirm is not used because some sending paths do not lock the socket. For MSG_PROBE we use the slow lookup (dst_confirm_neigh). - there are also 2 cases that need the slow lookup: __ip6_rt_update_pmtu and rt6_do_redirect. I hope &ipv6_hdr(skb)->saddr is the correct nexthop address to use here. 7. net: pending_confirm is not used anymore - I failed to understand the CXGB* code, I see dst_confirm() calls but I'm not sure dst_neigh_output() was called. For now I just removed the dst->pending_confirm flag and left all dst_confirm() calls there. Any better idea? - Now may be old function neigh_output() should be restored instead of dst_neigh_output? ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
-rw-r--r--include/linux/skbuff.h12
-rw-r--r--include/net/arp.h16
-rw-r--r--include/net/dst.h21
-rw-r--r--include/net/dst_ops.h2
-rw-r--r--include/net/ndisc.h17
-rw-r--r--include/net/sctp/sctp.h6
-rw-r--r--include/net/sctp/structs.h4
-rw-r--r--include/net/sock.h26
8 files changed, 88 insertions, 16 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h