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ip vrf: Add name_is_vrf 

Add name_is_vrf function to determine if given name corresponds to a
VRF device.

Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
This commit is contained in:
David Ahern 2016-06-29 11:26:57 -07:00 committed by Stephen Hemminger
parent cfcabf18d8
commit 7dc0e974f1
2 changed files with 52 additions and 0 deletions
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2
ip/ip_common.h
View File

@ -90,6 +90,8 @@ 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);
bool name_is_vrf(const char *name);
#ifndef INFINITY_LIFE_TIME
#define INFINITY_LIFE_TIME 0xFFFFFFFFU
#endif

50
ip/iplink_vrf.c
View File

@ -96,3 +96,53 @@ struct link_util vrf_slave_link_util = {
.print_opt = vrf_slave_print_opt,
.slave = true,
};
bool name_is_vrf(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 ifinfomsg *ifi;
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 false;
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 false;
}
parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
if (!tb[IFLA_LINKINFO])
return false;
parse_rtattr_nested(li, IFLA_INFO_MAX, tb[IFLA_LINKINFO]);
if (!li[IFLA_INFO_KIND])
return false;
return strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf") == 0;
}