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authorEric Dumazet <edumazet@google.com>2013-10-20 20:47:29 -0700
committerDavid S. Miller <davem@davemloft.net>2013-10-21 18:49:39 -0400
commitd3e5e0062de5f2c6444455b5708a62a50c93a50c (patch)
treeb384b9a84a28d34ae68afbd3902a4237e0eb9e0a
parentatm: firestream: remove duplicate define (diff)
downloadlinux-dev-d3e5e0062de5f2c6444455b5708a62a50c93a50c.tar.xz
linux-dev-d3e5e0062de5f2c6444455b5708a62a50c93a50c.zip
ipv6: gso: make ipv6_gso_segment() stackable
In order to support GSO on SIT tunnels, 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 '')
-rw-r--r--net/ipv6/ip6_offload.c23
1 files changed, 17 insertions, 6 deletions
diff --git a/net/ipv6/ip6_offload.c b/net/ipv6/ip6_offload.c
index 5c2fc1d04196..f9b33d82bb9d 100644
--- a/net/ipv6/ip6_offload.c
+++ b/net/ipv6/ip6_offload.c
@@ -90,6 +90,7 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
u8 *prevhdr;
int offset = 0;
bool tunnel;
+ int nhoff;
if (unlikely(skb_shinfo(skb)->gso_type &
~(SKB_GSO_UDP |
@@ -103,10 +104,16 @@ static struct sk_buff *ipv6_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(*ipv6h))))
goto out;
- 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 += sizeof(*ipv6h);
+
ipv6h = ipv6_hdr(skb);
__skb_pull(skb, sizeof(*ipv6h));
segs = ERR_PTR(-EPROTONOSUPPORT);
@@ -123,13 +130,17 @@ static struct sk_buff *ipv6_gso_segment(struct sk_buff *skb,
goto out;
for (skb = segs; skb; skb = skb->next) {
- ipv6h = ipv6_hdr(skb);
- ipv6h->payload_len = htons(skb->len - skb->mac_len -
- sizeof(*ipv6h));
+ ipv6h = (struct ipv6hdr *)(skb_mac_header(skb) + nhoff);
+ ipv6h->payload_len = htons(skb->len - nhoff - sizeof(*ipv6h));
+ if (tunnel) {
+ skb_reset_inner_headers(skb);
+ skb->encapsulation = 1;
+ }
+ skb->network_header = (u8 *)ipv6h - skb->head;
+
if (!tunnel && proto == IPPROTO_UDP) {
unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr);
- fptr = (struct frag_hdr *)(skb_network_header(skb) +
- unfrag_ip6hlen);
+ fptr = (struct frag_hdr *)((u8 *)ipv6h + unfrag_ip6hlen);
fptr->frag_off = htons(offset);
if (skb->next != NULL)
fptr->frag_off |= htons(IP6_MF);