1 /* 2 * link_veth.c veth driver module 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation; either version 7 * 2 of the License, or (at your option) any later version. 8 * 9 * Authors: Pavel Emelianov <xemul (at) openvz.org> 10 * 11 */ 12 13 #include <string.h> 14 #include <net/if.h> 15 #include <linux/veth.h> 16 17 #include "utils.h" 18 #include "ip_common.h" 19 20 static void print_usage(FILE *f) 21 { 22 printf("Usage: ip link <options> type veth [peer <options>]\n" 23 "To get <options> type 'ip link add help'\n"); 24 } 25 26 static void usage(void) 27 { 28 print_usage(stderr); 29 } 30 31 static int veth_parse_opt(struct link_util *lu, int argc, char **argv, 32 struct nlmsghdr *hdr) 33 { 34 char *dev = NULL; 35 char *name = NULL; 36 char *link = NULL; 37 char *type = NULL; 38 int index = 0; 39 int err, len; 40 struct rtattr * data; 41 int group; 42 struct ifinfomsg *ifm, *peer_ifm; 43 unsigned int ifi_flags, ifi_change; 44 45 if (strcmp(argv[0], "peer") != 0) { 46 usage(); 47 return -1; 48 } 49 50 ifm = NLMSG_DATA(hdr); 51 ifi_flags = ifm->ifi_flags; 52 ifi_change = ifm->ifi_change; 53 ifm->ifi_flags = 0; 54 ifm->ifi_change = 0; 55 56 data = NLMSG_TAIL(hdr); 57 addattr_l(hdr, 1024, VETH_INFO_PEER, NULL, 0); 58 59 hdr->nlmsg_len += sizeof(struct ifinfomsg); 60 61 err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr, 62 &name, &type, &link, &dev, &group, &index); 63 if (err < 0) 64 return err; 65 66 if (name) { 67 len = strlen(name) + 1; 68 if (len > IFNAMSIZ) 69 invarg("\"name\" too long\n", *argv); 70 addattr_l(hdr, 1024, IFLA_IFNAME, name, len); 71 } 72 73 peer_ifm = RTA_DATA(data); 74 peer_ifm->ifi_index = index; 75 peer_ifm->ifi_flags = ifm->ifi_flags; 76 peer_ifm->ifi_change = ifm->ifi_change; 77 ifm->ifi_flags = ifi_flags; 78 ifm->ifi_change = ifi_change; 79 80 if (group != -1) 81 addattr32(hdr, 1024, IFLA_GROUP, group); 82 83 data->rta_len = (void *)NLMSG_TAIL(hdr) - (void *)data; 84 return argc - 1 - err; 85 } 86 87 static void veth_print_help(struct link_util *lu, int argc, char **argv, 88 FILE *f) 89 { 90 print_usage(f); 91 } 92 93 struct link_util veth_link_util = { 94 .id = "veth", 95 .parse_opt = veth_parse_opt, 96 .print_help = veth_print_help, 97 }; 98
