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mpls: make RTA_OIF optional 

If user did not specify an oif, try and get it from the via address.
If failed to get device, return with -ENODEV.

Signed-off-by: Roopa Prabhu <roopa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Roopa Prabhu 2015-07-21 09:16:24 -07:00 committed by David S. Miller
parent fd36ef606c
commit 01faef2ceb
1 changed files with 66 additions and 1 deletions
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67
net/mpls/af_mpls.c
View File

@ -15,6 +15,7 @@
#include <net/ip_fib.h>
#include <net/netevent.h>
#include <net/netns/generic.h>
#include <net/ip6_route.h>
#include "internal.h"
#define LABEL_NOT_SPECIFIED (1<<20)
@ -330,6 +331,70 @@ static unsigned find_free_label(struct net *net)
return LABEL_NOT_SPECIFIED;
}
static struct net_device *inet_fib_lookup_dev(struct net *net, void *addr)
{
struct net_device *dev = NULL;
struct rtable *rt;
struct in_addr daddr;
memcpy(&daddr, addr, sizeof(struct in_addr));
rt = ip_route_output(net, daddr.s_addr, 0, 0, 0);
if (IS_ERR(rt))
goto errout;
dev = rt->dst.dev;
dev_hold(dev);
ip_rt_put(rt);
errout:
return dev;
}
static struct net_device *inet6_fib_lookup_dev(struct net *net, void *addr)
{
struct net_device *dev = NULL;
struct dst_entry *dst;
struct flowi6 fl6;
memset(&fl6, 0, sizeof(fl6));
memcpy(&fl6.daddr, addr, sizeof(struct in6_addr));
dst = ip6_route_output(net, NULL, &fl6);
if (dst->error)
goto errout;
dev = dst->dev;
dev_hold(dev);
errout:
dst_release(dst);
return dev;
}
static struct net_device *find_outdev(struct net *net,
struct mpls_route_config *cfg)
{
struct net_device *dev = NULL;
if (!cfg->rc_ifindex) {
switch (cfg->rc_via_table) {
case NEIGH_ARP_TABLE:
dev = inet_fib_lookup_dev(net, cfg->rc_via);
break;
case NEIGH_ND_TABLE:
dev = inet6_fib_lookup_dev(net, cfg->rc_via);
break;
case NEIGH_LINK_TABLE:
break;
}
} else {
dev = dev_get_by_index(net, cfg->rc_ifindex);
}
return dev;
}
static int mpls_route_add(struct mpls_route_config *cfg)
{
struct mpls_route __rcu **platform_label;
@ -361,7 +426,7 @@ static int mpls_route_add(struct mpls_route_config *cfg)
goto errout;
err = -ENODEV;
dev = dev_get_by_index(net, cfg->rc_ifindex);
dev = find_outdev(net, cfg);
if (!dev)
goto errout;