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iproute: Make it possible to specify index on link creation

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The RTM_NEWLINK message accepts ifi_index non-zero value and lets
creation of links with given index (if it's free, or course). This
functionality is available since linux-v3.5.

This patch makes this API available via ip tool.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Emelyanov 2013-12-26 23:15:20 +04:00 committed by Stephen Hemminger
parent f24a7e7205
commit 5e25cf77b9
3 changed files with 17 additions and 5 deletions
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2
include/utils.h
View File

@ -156,5 +156,5 @@ extern int inet_get_addr(const char *src, __u32 *dst, struct in6_addr *dst6);
struct iplink_req;
int iplink_parse(int argc, char **argv, struct iplink_req *req,
char **name, char **type, char **link, char **dev,
int *group);
int *group, int *index);
#endif /* __UTILS_H__ */

12
ip/iplink.c
View File

@ -47,7 +47,7 @@ void iplink_usage(void)
fprintf(stderr, " [ txqueuelen PACKETS ]\n");
fprintf(stderr, " [ address LLADDR ]\n");
fprintf(stderr, " [ broadcast LLADDR ]\n");
fprintf(stderr, " [ mtu MTU ]\n");
fprintf(stderr, " [ mtu MTU ] [index IDX ]\n");
fprintf(stderr, " [ numtxqueues QUEUE_COUNT ]\n");
fprintf(stderr, " [ numrxqueues QUEUE_COUNT ]\n");
fprintf(stderr, " type TYPE [ ARGS ]\n");
@ -291,7 +291,7 @@ static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
}
int iplink_parse(int argc, char **argv, struct iplink_req *req,
char **name, char **type, char **link, char **dev, int *group)
char **name, char **type, char **link, char **dev, int *group, int *index)
{
int ret, len;
char abuf[32];
@ -315,6 +315,9 @@ int iplink_parse(int argc, char **argv, struct iplink_req *req,
} else if (strcmp(*argv, "name") == 0) {
NEXT_ARG();
*name = *argv;
} else if (strcmp(*argv, "index") == 0) {
NEXT_ARG();
*index = atoi(*argv);
} else if (matches(*argv, "link") == 0) {
NEXT_ARG();
*link = *argv;
@ -506,6 +509,7 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
char *name = NULL;
char *link = NULL;
char *type = NULL;
int index = 0;
int group;
struct link_util *lu = NULL;
struct iplink_req req;
@ -518,7 +522,7 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
req.n.nlmsg_type = cmd;
req.i.ifi_family = preferred_family;
ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group);
ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group, &index);
if (ret < 0)
return ret;
@ -578,6 +582,8 @@ static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
}
addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
}
req.i.ifi_index = index;
}
if (name) {

8
ip/link_veth.c
View File

@ -30,6 +30,7 @@ static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
char *name = NULL;
char *link = NULL;
char *type = NULL;
int index = 0;
int err, len;
struct rtattr * data;
int group;
@ -45,7 +46,7 @@ static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
hdr->nlmsg_len += sizeof(struct ifinfomsg);
err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)hdr,
&name, &type, &link, &dev, &group);
&name, &type, &link, &dev, &group, &index);
if (err < 0)
return err;
@ -56,6 +57,11 @@ static int veth_parse_opt(struct link_util *lu, int argc, char **argv,
addattr_l(hdr, 1024, IFLA_IFNAME, name, len);
}
if (index) {
struct ifinfomsg *ifi = (struct ifinfomsg *)(data + 1);
ifi->ifi_index = index;
}
if (group != -1)
addattr32(hdr, 1024, IFLA_GROUP, group);