diff options
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/ip6_gre.c | 56 |
1 files changed, 33 insertions, 23 deletions
diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c index 1a5ad14..ca5a2c5 100644 --- a/net/ipv6/ip6_gre.c +++ b/net/ipv6/ip6_gre.c @@ -621,7 +621,7 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, struct net *net = tunnel->net; struct net_device *tdev; /* Device to other host */ struct ipv6hdr *ipv6h; /* Our new IP header */ - unsigned int max_headroom = 0; /* The extra header space needed */ + unsigned int min_headroom = 0; /* The extra header space needed */ int gre_hlen; struct ipv6_tel_txoption opt; int mtu; @@ -629,7 +629,6 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, struct net_device_stats *stats = &tunnel->dev->stats; int err = -1; u8 proto; - struct sk_buff *new_skb; __be16 protocol; if (dev->type == ARPHRD_ETHER) @@ -672,14 +671,14 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, mtu = dst_mtu(dst) - sizeof(*ipv6h); if (encap_limit >= 0) { - max_headroom += 8; + min_headroom += 8; mtu -= 8; } if (mtu < IPV6_MIN_MTU) mtu = IPV6_MIN_MTU; if (skb_dst(skb)) skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu); - if (skb->len > mtu) { + if (skb->len > mtu && !skb_is_gso(skb)) { *pmtu = mtu; err = -EMSGSIZE; goto tx_err_dst_release; @@ -697,20 +696,19 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev))); - max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; + min_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len; - if (skb_headroom(skb) < max_headroom || skb_shared(skb) || - (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { - new_skb = skb_realloc_headroom(skb, max_headroom); - if (max_headroom > dev->needed_headroom) - dev->needed_headroom = max_headroom; - if (!new_skb) - goto tx_err_dst_release; + if (skb_headroom(skb) < min_headroom || skb_header_cloned(skb)) { + int head_delta = SKB_DATA_ALIGN(min_headroom - + skb_headroom(skb) + + 16); - if (skb->sk) - skb_set_owner_w(new_skb, skb->sk); - consume_skb(skb); - skb = new_skb; + err = pskb_expand_head(skb, max_t(int, head_delta, 0), + 0, GFP_ATOMIC); + if (min_headroom > dev->needed_headroom) + dev->needed_headroom = min_headroom; + if (unlikely(err)) + goto tx_err_dst_release; } if (!fl6->flowi6_mark && ndst) @@ -723,10 +721,11 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL); } - if (likely(!skb->encapsulation)) { - skb_reset_inner_headers(skb); - skb->encapsulation = 1; - } + err = iptunnel_handle_offloads(skb, + (tunnel->parms.o_flags & GRE_CSUM) ? + SKB_GSO_GRE_CSUM : SKB_GSO_GRE); + if (err) + goto tx_err_dst_release; skb_push(skb, gre_hlen); skb_reset_network_header(skb); @@ -760,7 +759,9 @@ static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb, *ptr = tunnel->parms.o_key; ptr--; } - if (tunnel->parms.o_flags&GRE_CSUM) { + if ((tunnel->parms.o_flags & GRE_CSUM) && + !(skb_shinfo(skb)->gso_type & + (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) { *ptr = 0; *(__sum16 *)ptr = gre6_checksum(skb); } @@ -1559,9 +1560,18 @@ static int ip6gre_newlink(struct net *src_net, struct net_device *dev, dev->features |= GRE6_FEATURES; dev->hw_features |= GRE6_FEATURES; - /* Can use a lockless transmit, unless we generate output sequences */ - if (!(nt->parms.o_flags & GRE_SEQ)) + if (!(nt->parms.o_flags & GRE_SEQ)) { + /* TCP segmentation offload is not supported when we + * generate output sequences. + */ + dev->features |= NETIF_F_GSO_SOFTWARE; + dev->hw_features |= NETIF_F_GSO_SOFTWARE; + + /* Can use a lockless transmit, unless we generate + * output sequences + */ dev->features |= NETIF_F_LLTX; + } err = register_netdevice(dev); if (err) |
