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ipv4: Pass original device to ip_rcv_finish_core

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[ Upstream commit a1fd1ad255 ]

ip_route_input_rcu expects the original ingress device (e.g., for
proper multicast handling). The skb->dev can be changed by l3mdev_ip_rcv,
so dev needs to be saved prior to calling it. This was the behavior prior
to the listify changes.

Fixes: 5fa12739a5 ("net: ipv4: listify ip_rcv_finish")
Cc: Edward Cree <ecree@solarflare.com>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
David Ahern 2019-02-25 13:55:48 -08:00 • committed by Greg Kroah-Hartman
commit cc211561d1
1 changed files with 5 additions and 4 deletions
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9
net/ipv4/ip_input.c
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@ -308,11 +308,10 @@ drop:
}
static int ip_rcv_finish_core(struct net *net, struct sock *sk,
struct sk_buff *skb)
struct sk_buff *skb, struct net_device *dev)
{
const struct iphdr *iph = ip_hdr(skb);
int (*edemux)(struct sk_buff *skb);
struct net_device *dev = skb->dev;
struct rtable *rt;
int err;
@ -401,6 +400,7 @@ drop_error:
static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net_device *dev = skb->dev;
int ret;
/* if ingress device is enslaved to an L3 master device pass the
@ -410,7 +410,7 @@ static int ip_rcv_finish(struct net *net, struct sock *sk, struct sk_buff *skb)
if (!skb)
return NET_RX_SUCCESS;
ret = ip_rcv_finish_core(net, sk, skb);
ret = ip_rcv_finish_core(net, sk, skb, dev);
if (ret != NET_RX_DROP)
ret = dst_input(skb);
return ret;
@ -550,6 +550,7 @@ static void ip_list_rcv_finish(struct net *net, struct sock *sk,
INIT_LIST_HEAD(&sublist);
list_for_each_entry_safe(skb, next, head, list) {
struct net_device *dev = skb->dev;
struct dst_entry *dst;
skb_list_del_init(skb);
@ -559,7 +560,7 @@ static void ip_list_rcv_finish(struct net *net, struct sock *sk,
skb = l3mdev_ip_rcv(skb);
if (!skb)
continue;
if (ip_rcv_finish_core(net, sk, skb) == NET_RX_DROP)
if (ip_rcv_finish_core(net, sk, skb, dev) == NET_RX_DROP)
continue;
dst = skb_dst(skb);