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Return netmask along with IP address when querying through netdev

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The call netdev_get_in4() now allows the caller to also retrieve the
associated netmask.
This commit is contained in:
Justin Pettit
2009-07-10 17:21:43 -07:00
parent a5f37a2deb
commit f10725fea5
3 changed files with 27 additions and 11 deletions
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28
lib/netdev.c
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@@ -781,10 +781,12 @@ netdev_set_advertisements(struct netdev *netdev, uint32_t advertise)
return do_ethtool(netdev, &ecmd, ETHTOOL_SSET, "ETHTOOL_SSET");
}
/* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address (if
* 'in4' is non-null) and returns true. Otherwise, returns false. */
/* If 'netdev' has an assigned IPv4 address, sets '*in4' to that address
* and '*mask' to the netmask (if they are non-null) and returns true.
* Otherwise, returns false. */
bool
netdev_nodev_get_in4(const char *netdev_name, struct in_addr *in4)
netdev_nodev_get_in4(const char *netdev_name, struct in_addr *in4,
struct in_addr *mask)
{
struct ifreq ifr;
struct in_addr ip = { INADDR_ANY };
@@ -804,13 +806,25 @@ netdev_nodev_get_in4(const char *netdev_name, struct in_addr *in4)
if (in4) {
*in4 = ip;
}
if (mask) {
if (ioctl(af_inet_sock, SIOCGIFNETMASK, &ifr) == 0) {
struct sockaddr_in *sin = (struct sockaddr_in *) &ifr.ifr_addr;
*mask = sin->sin_addr;
} else {
VLOG_DBG_RL(&rl, "%s: ioctl(SIOCGIFNETMASK) failed: %s",
netdev_name, strerror(errno));
}
}
return ip.s_addr != INADDR_ANY;
}
bool
netdev_get_in4(const struct netdev *netdev, struct in_addr *in4)
netdev_get_in4(const struct netdev *netdev, struct in_addr *in4, struct
in_addr *mask)
{
return netdev_nodev_get_in4(netdev->name, in4);
return netdev_nodev_get_in4(netdev->name, in4, mask);
}
static void
@@ -1309,7 +1323,7 @@ netdev_find_dev_by_in4(const struct in_addr *in4, char **netdev_name)
struct svec dev_list;
/* Check the hint first. */
if (*netdev_name && (netdev_nodev_get_in4(*netdev_name, &dev_in4))
if (*netdev_name && (netdev_nodev_get_in4(*netdev_name, &dev_in4, NULL))
&& (dev_in4.s_addr == in4->s_addr)) {
return true;
}
@@ -1319,7 +1333,7 @@ netdev_find_dev_by_in4(const struct in_addr *in4, char **netdev_name)
netdev_enumerate(&dev_list);
for (i=0; i<dev_list.n; i++) {
if ((netdev_nodev_get_in4(dev_list.names[i], &dev_in4))
if ((netdev_nodev_get_in4(dev_list.names[i], &dev_in4, NULL))
&& (dev_in4.s_addr == in4->s_addr)) {
*netdev_name = xstrdup(dev_list.names[i]);
svec_destroy(&dev_list);