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authorDavid Ahern <dsa@cumulusnetworks.com>2017-01-20 12:58:34 -0800
committerDavid S. Miller <davem@davemloft.net>2017-01-23 12:48:14 -0500
commit9f427a0e474a67b454420c131709600d44850486 (patch)
tree39e22ae8180c3725267fe407b0cf067fddcf4411 /net/ieee802154/sysfs.h
parenta5b9b5a2d3d305598b70ed69dd40754e26516182 (diff)
downloadlinux-9f427a0e474a67b454420c131709600d44850486.tar.bz2
net: mpls: Fix multipath selection for LSR use case
MPLS multipath for LSR is broken -- always selecting the first nexthop in the one label case. For example: $ ip -f mpls ro ls 100 nexthop as to 200 via inet 172.16.2.2 dev virt12 nexthop as to 300 via inet 172.16.3.2 dev virt13 101 nexthop as to 201 via inet6 2000:2::2 dev virt12 nexthop as to 301 via inet6 2000:3::2 dev virt13 In this example incoming packets have a single MPLS labels which means BOS bit is set. The BOS bit is passed from mpls_forward down to mpls_multipath_hash which never processes the hash loop because BOS is 1. Update mpls_multipath_hash to process the entire label stack. mpls_hdr_len tracks the total mpls header length on each pass (on pass N mpls_hdr_len is N * sizeof(mpls_shim_hdr)). When the label is found with the BOS set it verifies the skb has sufficient header for ipv4 or ipv6, and find the IPv4 and IPv6 header by using the last mpls_hdr pointer and adding 1 to advance past it. With these changes I have verified the code correctly sees the label, BOS, IPv4 and IPv6 addresses in the network header and icmp/tcp/udp traffic for ipv4 and ipv6 are distributed across the nexthops. Fixes: 1c78efa8319ca ("mpls: flow-based multipath selection") Acked-by: Robert Shearman <rshearma@brocade.com> Signed-off-by: David Ahern <dsa@cumulusnetworks.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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