CODEWITHSUNDEEP
linuxlinux-kernelkernelnetlink
user2798118
user2798118

Reputation: 405

Add MPLS attributes in NETLINK Messages

Latest Linux Kernel 4.1.4 have MPLS data path support, We can program MPLS Routing table in kernel through NETLINK Socket. A new address family is defined AF_MPLS in socket.h.

I tried some code to write -

req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_CREATE;
req.n.nlmsg_type = RTM_NEWROUTE;
req.r.rtm_family = AF_MPLS;
req.r.rtm_table = RT_TABLE_MAIN;
req.r.rtm_protocol = RTPROT_BOOT;
req.r.rtm_scope = RT_SCOPE_UNIVERSE;
req.r.rtm_type = RTN_UNICAST;

However I am not able to figure out how to add MPLS Label in Netlink attribute.

Please help me out.

Upvotes: 2

Views: 828

Answers (1)

svinota
svinota

Reputation: 849

According to net/mpls/af_mpls.c:rtm_to_route_config(), the label should be provided with RTA_DST NLA.

Pls notice also assertions in the function, they're quite strict.

Upvotes: 4

Related Questions