korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-09-21 12:11:49 +08:00
Code Issues Packages Projects Releases Wiki Activity

ipv6: fix source address selection with route leak

Browse Source 
commit 252442f2ae upstream.

By default, an address assigned to the output interface is selected when
the source address is not specified. This is problematic when a route,
configured in a vrf, uses an interface from another vrf (aka route leak).
The original vrf does not own the selected source address.

Let's add a check against the output interface and call the appropriate
function to select the source address.

CC: stable@vger.kernel.org
Fixes: 0d240e7811 ("net: vrf: Implement get_saddr for IPv6")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Link: https://patch.msgid.link/20240710081521.3809742-3-nicolas.dichtel@6wind.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Nicolas Dichtel 2024-07-10 10:14:28 +02:00 committed by Greg Kroah-Hartman
parent 6cae8d04d8
commit 0e82587899
3 changed files with 17 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
include/net/ip6_route.h
View File

@ -132,18 +132,26 @@ void rt6_age_exceptions(struct fib6_info *f6i, struct fib6_gc_args *gc_args,
static inline int ip6_route_get_saddr(struct net *net, struct fib6_info *f6i,
const struct in6_addr *daddr,
unsigned int prefs,
unsigned int prefs, int l3mdev_index,
struct in6_addr *saddr)
{
struct net_device *l3mdev;
struct net_device *dev;
bool same_vrf;
int err = 0;
if (f6i && f6i->fib6_prefsrc.plen) {
*saddr = f6i->fib6_prefsrc.addr;
} else {
struct net_device *dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
rcu_read_lock();
err = ipv6_dev_get_saddr(net, dev, daddr, prefs, saddr);
}
l3mdev = dev_get_by_index_rcu(net, l3mdev_index);
if (!f6i || !f6i->fib6_prefsrc.plen || l3mdev)
dev = f6i ? fib6_info_nh_dev(f6i) : NULL;
same_vrf = !l3mdev || l3mdev_master_dev_rcu(dev) == l3mdev;
if (f6i && f6i->fib6_prefsrc.plen && same_vrf)
*saddr = f6i->fib6_prefsrc.addr;
else
err = ipv6_dev_get_saddr(net, same_vrf ? dev : l3mdev, daddr, prefs, saddr);
rcu_read_unlock();
return err;
}

1
net/ipv6/ip6_output.c
View File

@ -1120,6 +1120,7 @@ static int ip6_dst_lookup_tail(struct net *net, const struct sock *sk,
from = rt ? rcu_dereference(rt->from) : NULL;
err = ip6_route_get_saddr(net, from, &fl6->daddr,
sk ? inet6_sk(sk)->srcprefs : 0,
fl6->flowi6_l3mdev,
&fl6->saddr);
rcu_read_unlock();

2
net/ipv6/route.c
View File

@ -5681,7 +5681,7 @@ static int rt6_fill_node(struct net *net, struct sk_buff *skb,
goto nla_put_failure;
} else if (dest) {
struct in6_addr saddr_buf;
if (ip6_route_get_saddr(net, rt, dest, 0, &saddr_buf) == 0 &&
if (ip6_route_get_saddr(net, rt, dest, 0, 0, &saddr_buf) == 0 &&
nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
goto nla_put_failure;
}