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netdev-linux: Factor out obtaining an RTNL socket.

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Another function needs this same functionality in an upcoming commit, so
factor this into a new function get_rtnl_sock().
This commit is contained in:
Ben Pfaff
2010-05-03 14:31:16 -07:00
parent 54825e09b3
commit a5af30fbaa
1 changed files with 28 additions and 9 deletions
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37
lib/netdev-linux.c
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@@ -156,6 +156,7 @@ static int set_etheraddr(const char *netdev_name, int hwaddr_family,
const uint8_t[ETH_ADDR_LEN]);
static int get_stats_via_netlink(int ifindex, struct netdev_stats *stats);
static int get_stats_via_proc(const char *netdev_name, struct netdev_stats *stats);
static int get_rtnl_sock(struct nl_sock **);
static bool
is_netdev_linux_class(const struct netdev_class *netdev_class)
@@ -1850,8 +1851,7 @@ get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
.min_len = sizeof(struct rtnl_link_stats) },
};
static struct nl_sock *rtnl_sock;
struct nl_sock *rtnl_sock;
struct ofpbuf request;
struct ofpbuf *reply;
struct ifinfomsg *ifi;
@@ -1859,13 +1859,9 @@ get_stats_via_netlink(int ifindex, struct netdev_stats *stats)
struct nlattr *attrs[ARRAY_SIZE(rtnlgrp_link_policy)];
int error;
if (!rtnl_sock) {
error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &rtnl_sock);
if (error) {
VLOG_ERR_RL(&rl, "failed to create rtnetlink socket: %s",
strerror(error));
return error;
}
error = get_rtnl_sock(&rtnl_sock);
if (error) {
return error;
}
ofpbuf_init(&request, 0);
@@ -2129,3 +2125,26 @@ netdev_linux_get_ipv4(const struct netdev *netdev, struct in_addr *ip,
}
return error;
}
/* Obtains a Netlink routing socket that is not subscribed to any multicast
* groups. Returns 0 if successful, otherwise a positive errno value. Stores
* the socket in '*rtnl_sockp' if successful, otherwise a null pointer. */
static int
get_rtnl_sock(struct nl_sock **rtnl_sockp)
{
static struct nl_sock *sock;
int error;
if (!sock) {
error = nl_sock_create(NETLINK_ROUTE, 0, 0, 0, &sock);
if (error) {
VLOG_ERR_RL(&rl, "failed to create rtnetlink socket: %s",
strerror(error));
}
} else {
error = 0;
}
*rtnl_sockp = sock;
return error;
}