diff options
| author | Vasily Averin <vvs@virtuozzo.com> | 2021-08-02 11:52:54 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-08-03 13:21:39 +0300 |
| commit | a1e975e117ad657dedafed2ab64ce4ddccc9883b (patch) | |
| tree | df5e158b6f812e8d1de3d432fa44629f30fe47a2 /net/core/filter.c | |
| parent | 53744a4a72afe11779e0c69bbe0fff7dcd83e3ce (diff) | |
| download | linux-a1e975e117ad657dedafed2ab64ce4ddccc9883b.tar.xz | |
bpf: use skb_expand_head in bpf_out_neigh_v4/6
Unlike skb_realloc_headroom, new helper skb_expand_head
does not allocate a new skb if possible.
Additionally this patch replaces commonly used dereferencing with variables.
Signed-off-by: Vasily Averin <vvs@virtuozzo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/filter.c')
| -rw-r--r-- | net/core/filter.c | 27 |
1 files changed, 5 insertions, 22 deletions
diff --git a/net/core/filter.c b/net/core/filter.c index faf29fd82276..6f493ef5bb14 100644 --- a/net/core/filter.c +++ b/net/core/filter.c @@ -2180,17 +2180,9 @@ static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, skb->tstamp = 0; if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { - struct sk_buff *skb2; - - skb2 = skb_realloc_headroom(skb, hh_len); - if (unlikely(!skb2)) { - kfree_skb(skb); + skb = skb_expand_head(skb, hh_len); + if (!skb) return -ENOMEM; - } - if (skb->sk) - skb_set_owner_w(skb2, skb->sk); - consume_skb(skb); - skb = skb2; } rcu_read_lock_bh(); @@ -2214,8 +2206,7 @@ static int bpf_out_neigh_v6(struct net *net, struct sk_buff *skb, } rcu_read_unlock_bh(); if (dst) - IP6_INC_STATS(dev_net(dst->dev), - ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); + IP6_INC_STATS(net, ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES); out_drop: kfree_skb(skb); return -ENETDOWN; @@ -2287,17 +2278,9 @@ static int bpf_out_neigh_v4(struct net *net, struct sk_buff *skb, skb->tstamp = 0; if (unlikely(skb_headroom(skb) < hh_len && dev->header_ops)) { - struct sk_buff *skb2; - - skb2 = skb_realloc_headroom(skb, hh_len); - if (unlikely(!skb2)) { - kfree_skb(skb); + skb = skb_expand_head(skb, hh_len); + if (!skb) return -ENOMEM; - } - if (skb->sk) - skb_set_owner_w(skb2, skb->sk); - consume_skb(skb); - skb = skb2; } rcu_read_lock_bh(); |