diff options
| author | Eric Dumazet <edumazet@google.com> | 2013-10-19 11:42:56 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2013-10-19 19:36:18 -0400 |
| commit | 3347c960295583eee3fd58e5c539fb1972fbc005 (patch) | |
| tree | c0763cf5b85c136e72d226a0be56cc66e98bbcb0 /net/ipv4/af_inet.c | |
| parent | 2d26f0a3c0e22f6b3096a2503d086e4b5e99d708 (diff) | |
ipv4: gso: make inet_gso_segment() stackable
In order to support GSO on IPIP, we need to make
inet_gso_segment() stackable.
It should not assume network header starts right after mac
header.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/af_inet.c')
| -rw-r--r-- | net/ipv4/af_inet.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c index 4f8cd4fc451..5783ab5b5ef 100644 --- a/net/ipv4/af_inet.c +++ b/net/ipv4/af_inet.c @@ -1273,16 +1273,17 @@ out: } static struct sk_buff *inet_gso_segment(struct sk_buff *skb, - netdev_features_t features) + netdev_features_t features) { struct sk_buff *segs = ERR_PTR(-EINVAL); const struct net_offload *ops; + unsigned int offset = 0; struct iphdr *iph; + bool tunnel; int proto; + int nhoff; int ihl; int id; - unsigned int offset = 0; - bool tunnel; if (unlikely(skb_shinfo(skb)->gso_type & ~(SKB_GSO_TCPV4 | @@ -1296,6 +1297,8 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, 0))) goto out; + skb_reset_network_header(skb); + nhoff = skb_network_header(skb) - skb_mac_header(skb); if (unlikely(!pskb_may_pull(skb, sizeof(*iph)))) goto out; @@ -1312,7 +1315,10 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, goto out; __skb_pull(skb, ihl); - tunnel = !!skb->encapsulation; + tunnel = SKB_GSO_CB(skb)->encap_level > 0; + if (tunnel) + features = skb->dev->hw_enc_features & netif_skb_features(skb); + SKB_GSO_CB(skb)->encap_level += ihl; skb_reset_transport_header(skb); @@ -1327,18 +1333,23 @@ static struct sk_buff *inet_gso_segment(struct sk_buff *skb, skb = segs; do { - iph = ip_hdr(skb); + iph = (struct iphdr *)(skb_mac_header(skb) + nhoff); if (!tunnel && proto == IPPROTO_UDP) { iph->id = htons(id); iph->frag_off = htons(offset >> 3); if (skb->next != NULL) iph->frag_off |= htons(IP_MF); - offset += (skb->len - skb->mac_len - iph->ihl * 4); + offset += skb->len - nhoff - ihl; } else { iph->id = htons(id++); } - iph->tot_len = htons(skb->len - skb->mac_len); + iph->tot_len = htons(skb->len - nhoff); ip_send_check(iph); + if (tunnel) { + skb_reset_inner_headers(skb); + skb->encapsulation = 1; + } + skb->network_header = (u8 *)iph - skb->head; } while ((skb = skb->next)); out: |