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authorTom Herbert <tom@herbertland.com>2016-04-30 03:12:19 +0300
committerDavid S. Miller <davem@davemloft.net>2016-05-03 02:23:31 +0300
commit182a352d2d5e0b435f7856c0cc23d467dcec55ef (patch)
treee523a1f200325dd0ec9d0b25b769f06920c65808 /net/ipv4/ip_gre.c
parent8eb30be0352d09165e94a41fef1c7b994dca0714 (diff)
downloadlinux-182a352d2d5e0b435f7856c0cc23d467dcec55ef.tar.xz
gre: Create common functions for transmit
Create common functions for both IPv4 and IPv6 GRE in transmit. These are put into gre.h. Common functions are for: - GRE checksum calculation. Move gre_checksum to gre.h. - Building a GRE header. Move GRE build_header and rename gre_build_header. Signed-off-by: Tom Herbert <tom@herbertland.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.c52
1 files changed, 5 insertions, 47 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index f6db3d6a4d4d..2480d79b0e37 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -329,49 +329,6 @@ drop:
return 0;
}
-static __sum16 gre_checksum(struct sk_buff *skb)
-{
- __wsum csum;
-
- if (skb->ip_summed == CHECKSUM_PARTIAL)
- csum = lco_csum(skb);
- else
- csum = skb_checksum(skb, 0, skb->len, 0);
- return csum_fold(csum);
-}
-
-static void build_header(struct sk_buff *skb, int hdr_len, __be16 flags,
- __be16 proto, __be32 key, __be32 seq)
-{
- struct gre_base_hdr *greh;
-
- skb_push(skb, hdr_len);
-
- skb_reset_transport_header(skb);
- greh = (struct gre_base_hdr *)skb->data;
- greh->flags = gre_tnl_flags_to_gre_flags(flags);
- greh->protocol = proto;
-
- if (flags & (TUNNEL_KEY | TUNNEL_CSUM | TUNNEL_SEQ)) {
- __be32 *ptr = (__be32 *)(((u8 *)greh) + hdr_len - 4);
-
- if (flags & TUNNEL_SEQ) {
- *ptr = seq;
- ptr--;
- }
- if (flags & TUNNEL_KEY) {
- *ptr = key;
- ptr--;
- }
- if (flags & TUNNEL_CSUM &&
- !(skb_shinfo(skb)->gso_type &
- (SKB_GSO_GRE | SKB_GSO_GRE_CSUM))) {
- *ptr = 0;
- *(__sum16 *)ptr = gre_checksum(skb);
- }
- }
-}
-
static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
const struct iphdr *tnl_params,
__be16 proto)
@@ -382,8 +339,9 @@ static void __gre_xmit(struct sk_buff *skb, struct net_device *dev,
tunnel->o_seqno++;
/* Push GRE header. */
- build_header(skb, tunnel->tun_hlen, tunnel->parms.o_flags,
- proto, tunnel->parms.o_key, htonl(tunnel->o_seqno));
+ gre_build_header(skb, tunnel->tun_hlen,
+ tunnel->parms.o_flags, proto, tunnel->parms.o_key,
+ htonl(tunnel->o_seqno));
skb_set_inner_protocol(skb, proto);
ip_tunnel_xmit(skb, dev, tnl_params, tnl_params->protocol);
@@ -460,8 +418,8 @@ static void gre_fb_xmit(struct sk_buff *skb, struct net_device *dev)
goto err_free_rt;
flags = tun_info->key.tun_flags & (TUNNEL_CSUM | TUNNEL_KEY);
- build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB),
- tunnel_id_to_key(tun_info->key.tun_id), 0);
+ gre_build_header(skb, tunnel_hlen, flags, htons(ETH_P_TEB),
+ tunnel_id_to_key(tun_info->key.tun_id), 0);
df = key->tun_flags & TUNNEL_DONT_FRAGMENT ? htons(IP_DF) : 0;