static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *hdr)
{
char *name = NULL;
char *type = NULL;
char *link = NULL;
char *dev = NULL;
int err, len;
struct rtattr * data;
if (strcmp(argv[0], "peer") != 0) {
usage();
return -1;
}
data = NLMSG_TAIL(hdr);
addattr_l(hdr, 1024, VETH_INFO_PEER, NULL, 0);
hdr->nlmsg_len += sizeof(struct ifinfomsg);
err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr,
&name, &type, &link, &dev);
if (err < 0)
return err;
if (name) {
len = strlen(name) + 1;
if (len > IFNAMSIZ)
invarg("\"name\" too long\n", *argv);
addattr_l(hdr, 1024, IFLA_IFNAME, name, len);
}
data->rta_len = (void *)NLMSG_TAIL(hdr) - (void *)data;
return argc - 1 - err;
}
static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
struct nlmsghdr *hdr)
{
char *dev = NULL;
char *name = NULL;
char *link = NULL;
char *type = NULL;
int index = 0;
int err, len;
struct rtattr * data;
int group;
struct ifinfomsg *ifm, *peer_ifm;
unsigned int ifi_flags, ifi_change;
if (strcmp(argv[0], "peer") != 0) {
usage();
return -1;
}
ifm = NLMSG_DATA(hdr);
ifi_flags = ifm->ifi_flags;
ifi_change = ifm->ifi_change;
ifm->ifi_flags = 0;
ifm->ifi_change = 0;
data = NLMSG_TAIL(hdr);
addattr_l(hdr, 1024, VETH_INFO_PEER, NULL, 0);
hdr->nlmsg_len += sizeof(struct ifinfomsg);
err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr,
&name, &type, &link, &dev, &group, &index);
if (err < 0)
return err;
if (name) {
len = strlen(name) + 1;
if (len > IFNAMSIZ)
invarg("\"name\" too long\n", *argv);
addattr_l(hdr, 1024, IFLA_IFNAME, name, len);
}
peer_ifm = RTA_DATA(data);
peer_ifm->ifi_index = index;
peer_ifm->ifi_flags = ifm->ifi_flags;
peer_ifm->ifi_change = ifm->ifi_change;
ifm->ifi_flags = ifi_flags;
ifm->ifi_change = ifi_change;
if (group != -1)
addattr32(hdr, 1024, IFLA_GROUP, group);
data->rta_len = (void *)NLMSG_TAIL(hdr) - (void *)data;
return argc - 1 - err;
}
static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
{
int len;
char *dev = NULL;
char *name = NULL;
char *link = NULL;
char *type = NULL;
int index = 0;
int group;
struct link_util *lu = NULL;
struct iplink_req req;
int ret;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.n.nlmsg_flags = NLM_F_REQUEST|flags;
req.n.nlmsg_type = cmd;
req.i.ifi_family = preferred_family;
ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group, &index);
if (ret < 0)
return ret;
argc -= ret;
argv += ret;
if (group != -1) {
if (dev)
addattr_l(&req.n, sizeof(req), IFLA_GROUP,
&group, sizeof(group));
else {
if (argc) {
fprintf(stderr, "Garbage instead of arguments "
"\"%s ...\". Try \"ip link "
"help\".\n", *argv);
return -1;
}
if (flags & NLM_F_CREATE) {
fprintf(stderr, "group cannot be used when "
"creating devices.\n");
return -1;
}
req.i.ifi_index = 0;
addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
exit(2);
return 0;
}
}
if (!(flags & NLM_F_CREATE)) {
if (!dev) {
fprintf(stderr, "Not enough information: \"dev\" "
"argument is required.\n");
exit(-1);
}
req.i.ifi_index = ll_name_to_index(dev);
if (req.i.ifi_index == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n", dev);
return -1;
}
} else {
/* Allow "ip link add dev" and "ip link add name" */
if (!name)
name = dev;
if (link) {
int ifindex;
ifindex = ll_name_to_index(link);
if (ifindex == 0) {
fprintf(stderr, "Cannot find device \"%s\"\n",
link);
return -1;
}
addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
}
req.i.ifi_index = index;
}
if (name) {
len = strlen(name) + 1;
if (len == 1)
invarg("\"\" is not a valid device identifier\n", "name");
if (len > IFNAMSIZ)
invarg("\"name\" too long\n", name);
addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
}
if (type) {
struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
strlen(type));
lu = get_link_kind(type);
if (lu && argc) {
struct rtattr * data = NLMSG_TAIL(&req.n);
addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
if (lu->parse_opt &&
lu->parse_opt(lu, argc, argv, &req.n))
return -1;
data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
} else if (argc) {
if (matches(*argv, "help") == 0)
usage();
fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
"Try \"ip link help\".\n", *argv);
return -1;
}
linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
} else if (flags & NLM_F_CREATE) {
fprintf(stderr, "Not enough information: \"type\" argument "
"is required\n");
return -1;
}
if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
exit(2);
return 0;
}