Add ipvrf_get_table to lookup table id for device name. Returns 0 on any error or if name is not a VRF device.
Signed-off-by: David Ahern <d...@cumulusnetworks.com> --- ip/ip_common.h | 1 + ip/iplink_vrf.c | 63 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 64 insertions(+) diff --git a/ip/ip_common.h b/ip/ip_common.h index b747ea47122d..c8188122ab5d 100644 --- a/ip/ip_common.h +++ b/ip/ip_common.h @@ -90,6 +90,7 @@ struct link_util *get_link_slave_kind(const char *slave_kind); void br_dump_bridge_id(const struct ifla_bridge_id *id, char *buf, size_t len); +__u32 ipvrf_get_table(const char *name); bool name_is_vrf(const char *name); #ifndef INFINITY_LIFE_TIME diff --git a/ip/iplink_vrf.c b/ip/iplink_vrf.c index 166f566e6d77..015b41e1e7b0 100644 --- a/ip/iplink_vrf.c +++ b/ip/iplink_vrf.c @@ -97,6 +97,69 @@ struct link_util vrf_slave_link_util = { .slave = true, }; +/* returns table id if name is a VRF device */ +__u32 ipvrf_get_table(const char *name) +{ + struct { + struct nlmsghdr n; + struct ifinfomsg i; + char buf[1024]; + } req = { + .n = { + .nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)), + .nlmsg_flags = NLM_F_REQUEST, + .nlmsg_type = RTM_GETLINK, + }, + .i = { + .ifi_family = preferred_family, + }, + }; + struct { + struct nlmsghdr n; + char buf[8192]; + } answer; + struct rtattr *tb[IFLA_MAX+1]; + struct rtattr *li[IFLA_INFO_MAX+1]; + struct rtattr *vrf_attr[IFLA_VRF_MAX + 1]; + struct ifinfomsg *ifi; + __u32 tb_id = 0; + int len; + + addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, strlen(name) + 1); + + if (rtnl_talk(&rth, &req.n, &answer.n, sizeof(answer)) < 0) + return 0; + + ifi = NLMSG_DATA(&answer.n); + len = answer.n.nlmsg_len - NLMSG_LENGTH(sizeof(*ifi)); + if (len < 0) { + fprintf(stderr, "BUG: Invalid response to link query.\n"); + return 0; + } + + parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len); + + if (!tb[IFLA_LINKINFO]) + return 0; + + parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]); + + if (!li[IFLA_INFO_KIND] || !li[IFLA_INFO_DATA]) + return 0; + + if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf")) + return 0; + + parse_rtattr_nested(vrf_attr, IFLA_VRF_MAX, li[IFLA_INFO_DATA]); + if (vrf_attr[IFLA_VRF_TABLE]) + tb_id = rta_getattr_u32(vrf_attr[IFLA_VRF_TABLE]); + + if (!tb_id) + fprintf(stderr, "BUG: VRF %s is missing table id\n", name); + + return tb_id; +} + bool name_is_vrf(const char *name) { struct { -- 2.1.4