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netdev: New function netdev_get_ip_by_name().

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This is like netdev_get_in4_by_name() but accepts any IP address instead
of just an IPv4 address.

It will acquire its first user in an upcoming commit.

Signed-off-by: Ben Pfaff <blp@ovn.org>
Acked-by: Mark Michelson <mmichels@redhat.com>
This commit is contained in:
Ben Pfaff
2018-04-13 10:03:12 -07:00
parent 93b7faf1c7
commit ee4776b8bc
2 changed files with 62 additions and 26 deletions
Download Patch File Download Diff File Expand all files Collapse all files

87
lib/netdev.c
View File

@@ -1142,39 +1142,74 @@ netdev_set_in4(struct netdev *netdev, struct in_addr addr, struct in_addr mask)
: EOPNOTSUPP);
}
/* Obtains ad IPv4 address from device name and save the address in
* in4. Returns 0 if successful, otherwise a positive errno value.
*/
static int
netdev_get_addresses_by_name(const char *device_name,
struct in6_addr **addrsp, int *n_addrsp)
{
struct netdev *netdev;
int error = netdev_open(device_name, NULL, &netdev);
if (error) {
*addrsp = NULL;
*n_addrsp = 0;
return error;
}
struct in6_addr *masks;
error = netdev_get_addr_list(netdev, addrsp, &masks, n_addrsp);
netdev_close(netdev);
free(masks);
return error;
}
/* Obtains an IPv4 address from 'device_name' and save the address in '*in4'.
* Returns 0 if successful, otherwise a positive errno value. */
int
netdev_get_in4_by_name(const char *device_name, struct in_addr *in4)
{
struct in6_addr *mask, *addr6;
int err, n_in6, i;
struct netdev *dev;
struct in6_addr *addrs;
int n;
int error = netdev_get_addresses_by_name(device_name, &addrs, &n);
err = netdev_open(device_name, NULL, &dev);
if (err) {
return err;
}
err = netdev_get_addr_list(dev, &addr6, &mask, &n_in6);
if (err) {
goto out;
}
for (i = 0; i < n_in6; i++) {
if (IN6_IS_ADDR_V4MAPPED(&addr6[i])) {
in4->s_addr = in6_addr_get_mapped_ipv4(&addr6[i]);
goto out;
in4->s_addr = 0;
if (!error) {
error = ENOENT;
for (int i = 0; i < n; i++) {
if (IN6_IS_ADDR_V4MAPPED(&addrs[i])) {
in4->s_addr = in6_addr_get_mapped_ipv4(&addrs[i]);
error = 0;
break;
}
}
}
err = -ENOENT;
out:
free(addr6);
free(mask);
netdev_close(dev);
return err;
free(addrs);
return error;
}
/* Obtains an IPv4 or IPv6 address from 'device_name' and save the address in
* '*ss', representing IPv4 addressse as v6-mapped. Returns 0 if successful,
* otherwise a positive errno value. */
int
netdev_get_ip_by_name(const char *device_name, struct in6_addr *in6)
{
struct in6_addr *addrs;
int n;
int error = netdev_get_addresses_by_name(device_name, &addrs, &n);
*in6 = in6addr_any;
if (!error) {
error = ENOENT;
for (int i = 0; i < n; i++) {
if (!in6_is_lla(&addrs[i])) {
*in6 = addrs[i];
error = 0;
break;
}
}
}
free(addrs);
return error;
}
/* Adds 'router' as a default IP gateway for the TCP/IP stack that corresponds

1
lib/netdev.h
View File

@@ -282,6 +282,7 @@ void netdev_restore_flags(struct netdev_saved_flags *);
/* TCP/IP stack interface. */
int netdev_set_in4(struct netdev *, struct in_addr addr, struct in_addr mask);
int netdev_get_in4_by_name(const char *device_name, struct in_addr *in4);
int netdev_get_ip_by_name(const char *device_name, struct in6_addr *);
int netdev_get_addr_list(const struct netdev *netdev, struct in6_addr **addr,
struct in6_addr **mask, int *n_in6);