| /* iplink_vrf.c VRF device support |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU General Public License |
| * as published by the Free Software Foundation; either version |
| * 2 of the License, or (at your option) any later version. |
| * |
| * Authors: Shrijeet Mukherjee <shm@cumulusnetworks.com> |
| */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <linux/if_link.h> |
| |
| #include "rt_names.h" |
| #include "utils.h" |
| #include "ip_common.h" |
| |
| static void vrf_explain(FILE *f) |
| { |
| fprintf(f, "Usage: ... vrf table TABLEID\n"); |
| } |
| |
| static void explain(void) |
| { |
| vrf_explain(stderr); |
| } |
| |
| static int vrf_parse_opt(struct link_util *lu, int argc, char **argv, |
| struct nlmsghdr *n) |
| { |
| while (argc > 0) { |
| if (matches(*argv, "table") == 0) { |
| __u32 table; |
| |
| NEXT_ARG(); |
| |
| if (rtnl_rttable_a2n(&table, *argv)) |
| invarg("invalid table ID\n", *argv); |
| addattr32(n, 1024, IFLA_VRF_TABLE, table); |
| } else if (matches(*argv, "help") == 0) { |
| explain(); |
| return -1; |
| } else { |
| fprintf(stderr, "vrf: unknown option \"%s\"?\n", |
| *argv); |
| explain(); |
| return -1; |
| } |
| argc--, argv++; |
| } |
| |
| return 0; |
| } |
| |
| static void vrf_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[]) |
| { |
| if (!tb) |
| return; |
| |
| if (tb[IFLA_VRF_TABLE]) |
| fprintf(f, "table %u ", rta_getattr_u32(tb[IFLA_VRF_TABLE])); |
| } |
| |
| static void vrf_slave_print_opt(struct link_util *lu, FILE *f, |
| struct rtattr *tb[]) |
| { |
| if (!tb) |
| return; |
| |
| if (tb[IFLA_VRF_PORT_TABLE]) { |
| fprintf(f, "table %u ", |
| rta_getattr_u32(tb[IFLA_VRF_PORT_TABLE])); |
| } |
| } |
| |
| static void vrf_print_help(struct link_util *lu, int argc, char **argv, |
| FILE *f) |
| { |
| vrf_explain(f); |
| } |
| |
| struct link_util vrf_link_util = { |
| .id = "vrf", |
| .maxattr = IFLA_VRF_MAX, |
| .parse_opt = vrf_parse_opt, |
| .print_opt = vrf_print_opt, |
| .print_help = vrf_print_help, |
| }; |
| |
| struct link_util vrf_slave_link_util = { |
| .id = "vrf_slave", |
| .maxattr = IFLA_VRF_PORT_MAX, |
| .print_opt = vrf_slave_print_opt, |
| }; |
| |
| /* 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; |
| } |
| |
| int 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 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]) |
| return 0; |
| |
| if (strcmp(RTA_DATA(li[IFLA_INFO_KIND]), "vrf")) |
| return 0; |
| |
| return ifi->ifi_index; |
| } |