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vrf: use skb_expand_head in vrf_finish_output 

Unlike skb_realloc_headroom, new helper skb_expand_head
does not allocate a new skb if possible.

Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vasily Averin 2021-08-02 11:52:40 +03:00 committed by David S. Miller
parent 5678a59579
commit 14ee70ca89
1 changed files with 7 additions and 14 deletions
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21
drivers/net/vrf.c
View File

@ -857,30 +857,24 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
unsigned int hh_len = LL_RESERVED_SPACE(dev);
struct neighbour *neigh;
bool is_v6gw = false;
int ret = -EINVAL;
nf_reset_ct(skb);
/* Be paranoid, rather than too clever. */
if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) {
struct sk_buff *skb2;
skb2 = skb_realloc_headroom(skb, LL_RESERVED_SPACE(dev));
if (!skb2) {
ret = -ENOMEM;
goto err;
skb = skb_expand_head(skb, hh_len);
if (!skb) {
skb->dev->stats.tx_errors++;
return -ENOMEM;
}
if (skb->sk)
skb_set_owner_w(skb2, skb->sk);
consume_skb(skb);
skb = skb2;
}
rcu_read_lock_bh();
neigh = ip_neigh_for_gw(rt, skb, &is_v6gw);
if (!IS_ERR(neigh)) {
int ret;
sock_confirm_neigh(skb, neigh);
/* if crossing protocols, can not use the cached header */
ret = neigh_output(neigh, skb, is_v6gw);
@ -889,9 +883,8 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
}
rcu_read_unlock_bh();
err:
vrf_tx_error(skb->dev, skb);
return ret;
return -EINVAL;
}
static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)