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ip vrf: Add ipvrf_get_table 

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 <dsa@cumulusnetworks.com>
This commit is contained in:
David Ahern 2016-06-29 11:27:01 -07:00 committed by Stephen Hemminger
parent d84b1878ea
commit 9b76577042
2 changed files with 64 additions and 0 deletions
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1
ip/ip_common.h
View File

@ -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

63
ip/iplink_vrf.c
View File

@ -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 {