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| author | Alexander Duyck <aduyck@mirantis.com> | 2016-04-14 21:33:37 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-04-17 01:09:13 +0200 |
| commit | aed069df099cd1a27900acb56bb892ec24c66ac4 (patch) | |
| tree | 8d25251d281421e71d2a30b9c72716885217c5e3 /net/ipv4/ip_gre.c | |
| parent | Merge branch 'w5100-spi-and-w5200-support' (diff) | |
| download | linux-aed069df099cd1a27900acb56bb892ec24c66ac4.tar.xz linux-aed069df099cd1a27900acb56bb892ec24c66ac4.zip | |
ip_tunnel_core: iptunnel_handle_offloads returns int and doesn't free skb
This patch updates the IP tunnel core function iptunnel_handle_offloads so
that we return an int and do not free the skb inside the function. This
actually allows us to clean up several paths in several tunnels so that we
can free the skb at one point in the path without having to have a
secondary path if we are supporting tunnel offloads.
In addition it should resolve some double-free issues I have found in the
tunnels paths as I believe it is possible for us to end up triggering such
an event in the case of fou or gue.
Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_gre.c')
| -rw-r--r-- | net/ipv4/ip_gre.c | 20 |
1 files changed, 6 insertions, 14 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index af5d1f38217f..eedd829a2f87 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -500,8 +500,7 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); } -static struct sk_buff *gre_handle_offloads(struct sk_buff *skb, - bool csum) +static int gre_handle_offloads(struct sk_buff *skb, bool csum) { return iptunnel_handle_offloads(skb, csum ? SKB_GSO_GRE_CSUM : SKB_GSO_GRE); } @@ -568,11 +567,8 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev) } /* Push Tunnel header. */ - skb = gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM)); - if (IS_ERR(skb)) { - skb = NULL; + if (gre_handle_offloads(skb, !!(tun_info->key.tun_flags & TUNNEL_CSUM))) goto err_free_rt; - } flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY); build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB), @@ -640,16 +636,14 @@ static netdev_tx_t ipgre_xmit(struct sk_buff *skb, tnl_params = &tunnel->parms.iph; } - skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); - if (IS_ERR(skb)) - goto out; + if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) + goto free_skb; __gre_xmit(skb, dev, tnl_params, skb->protocol); return NETDEV_TX_OK; free_skb: kfree_skb(skb); -out: dev->stats.tx_dropped++; return NETDEV_TX_OK; } @@ -664,9 +658,8 @@ static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, return NETDEV_TX_OK; } - skb = gre_handle_offloads(skb, !!(tunnel->parms.o_flags&TUNNEL_CSUM)); - if (IS_ERR(skb)) - goto out; + if (gre_handle_offloads(skb, !!(tunnel->parms.o_flags & TUNNEL_CSUM))) + goto free_skb; if (skb_cow_head(skb, dev->needed_headroom)) goto free_skb; @@ -676,7 +669,6 @@ static netdev_tx_t gre_tap_xmit(struct sk_buff *skb, free_skb: kfree_skb(skb); -out: dev->stats.tx_dropped++; return NETDEV_TX_OK; } |