diff options
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/gre.c | 32 | ||||
| -rw-r--r-- | net/ipv4/ip_gre.c | 40 |
2 files changed, 33 insertions, 39 deletions
diff --git a/net/ipv4/gre.c b/net/ipv4/gre.c index 8b9a373..1cbc465 100644 --- a/net/ipv4/gre.c +++ b/net/ipv4/gre.c @@ -61,6 +61,38 @@ int gre_del_protocol(const struct gre_protocol *proto, u8 version) } EXPORT_SYMBOL_GPL(gre_del_protocol); +void gre_build_header(struct sk_buff *skb, const struct tnl_ptk_info *tpi, + int hdr_len) +{ + struct gre_base_hdr *greh; + + skb_push(skb, hdr_len); + + greh = (struct gre_base_hdr *)skb->data; + greh->flags = tnl_flags_to_gre_flags(tpi->flags); + greh->protocol = tpi->proto; + + if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) { + __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4); + + if (tpi->flags&TUNNEL_SEQ) { + *ptr = tpi->seq; + ptr--; + } + if (tpi->flags&TUNNEL_KEY) { + *ptr = tpi->key; + ptr--; + } + if (tpi->flags&TUNNEL_CSUM && + !(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) { + *ptr = 0; + *(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0, + skb->len, 0)); + } + } +} +EXPORT_SYMBOL_GPL(gre_build_header); + static __sum16 check_checksum(struct sk_buff *skb) { __sum16 csum = 0; diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 19863a8..362c7c4 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -248,40 +248,6 @@ error: return ERR_PTR(err); } -static struct sk_buff *gre_build_header(struct sk_buff *skb, - const struct tnl_ptk_info *tpi, - int hdr_len) -{ - struct gre_base_hdr *greh; - - skb_push(skb, hdr_len); - - greh = (struct gre_base_hdr *)skb->data; - greh->flags = tnl_flags_to_gre_flags(tpi->flags); - greh->protocol = tpi->proto; - - if (tpi->flags&(TUNNEL_KEY|TUNNEL_CSUM|TUNNEL_SEQ)) { - __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4); - - if (tpi->flags&TUNNEL_SEQ) { - *ptr = tpi->seq; - ptr--; - } - if (tpi->flags&TUNNEL_KEY) { - *ptr = tpi->key; - ptr--; - } - if (tpi->flags&TUNNEL_CSUM && - !(skb_shinfo(skb)->gso_type & SKB_GSO_GRE)) { - *(__sum16 *)ptr = 0; - *(__sum16 *)ptr = csum_fold(skb_checksum(skb, 0, - skb->len, 0)); - } - } - - return skb; -} - static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, const struct iphdr *tnl_params, __be16 proto) @@ -302,11 +268,7 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev, tpi.seq = htonl(tunnel->o_seqno); /* Push GRE header. */ - skb = gre_build_header(skb, &tpi, tunnel->hlen); - if (unlikely(!skb)) { - dev->stats.tx_dropped++; - return; - } + gre_build_header(skb, &tpi, tunnel->hlen); ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol); } |