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authorTom Herbert <therbert@google.com>2014-11-04 09:06:51 -0800
committerDavid S. Miller <davem@davemloft.net>2014-11-05 16:30:02 -0500
commit63487babf08d6d67483c67ed21d8cea6674a44ec (patch)
treef0e11d54e33a689a25bed43f7bd3c720b49a6bcd /net/ipv4/ip_tunnel.c
parent890b7916d0965829ad1c457aa61f049a210c19f8 (diff)
net: Move fou_build_header into fou.c and refactor
Move fou_build_header out of ip_tunnel.c and into fou.c splitting it up into fou_build_header, gue_build_header, and fou_build_udp. This allows for other users for TX of FOU or GUE. Change ip_tunnel_encap to call fou_build_header or gue_build_header based on the tunnel encapsulation type. Similarly, added fou_encap_hlen and gue_encap_hlen functions which are called by ip_encap_hlen. New net/fou.h has prototypes and defines for this. Added NET_FOU_IP_TUNNELS configuration. When this is set, IP tunnels can use FOU/GUE and fou module is also selected. Signed-off-by: Tom Herbert <therbert@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_tunnel.c')
-rw-r--r--net/ipv4/ip_tunnel.c61
1 files changed, 12 insertions, 49 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 0bb8e141eacc..c3587e1c8b82 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -56,7 +56,10 @@
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/udp.h>
-#include <net/gue.h>
+
+#if IS_ENABLED(CONFIG_NET_FOU)
+#include <net/fou.h>
+#endif
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
@@ -494,10 +497,12 @@ static int ip_encap_hlen(struct ip_tunnel_encap *e)
switch (e->type) {
case TUNNEL_ENCAP_NONE:
return 0;
+#if IS_ENABLED(CONFIG_NET_FOU)
case TUNNEL_ENCAP_FOU:
- return sizeof(struct udphdr);
+ return fou_encap_hlen(e);
case TUNNEL_ENCAP_GUE:
- return sizeof(struct udphdr) + sizeof(struct guehdr);
+ return gue_encap_hlen(e);
+#endif
default:
return -EINVAL;
}
@@ -526,60 +531,18 @@ int ip_tunnel_encap_setup(struct ip_tunnel *t,
}
EXPORT_SYMBOL_GPL(ip_tunnel_encap_setup);
-static int fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e,
- size_t hdr_len, u8 *protocol, struct flowi4 *fl4)
-{
- struct udphdr *uh;
- __be16 sport;
- bool csum = !!(e->flags & TUNNEL_ENCAP_FLAG_CSUM);
- int type = csum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
-
- skb = iptunnel_handle_offloads(skb, csum, type);
-
- if (IS_ERR(skb))
- return PTR_ERR(skb);
-
- /* Get length and hash before making space in skb */
-
- sport = e->sport ? : udp_flow_src_port(dev_net(skb->dev),
- skb, 0, 0, false);
-
- skb_push(skb, hdr_len);
-
- skb_reset_transport_header(skb);
- uh = udp_hdr(skb);
-
- if (e->type == TUNNEL_ENCAP_GUE) {
- struct guehdr *guehdr = (struct guehdr *)&uh[1];
-
- guehdr->version = 0;
- guehdr->hlen = 0;
- guehdr->flags = 0;
- guehdr->next_hdr = *protocol;
- }
-
- uh->dest = e->dport;
- uh->source = sport;
- uh->len = htons(skb->len);
- uh->check = 0;
- udp_set_csum(!(e->flags & TUNNEL_ENCAP_FLAG_CSUM), skb,
- fl4->saddr, fl4->daddr, skb->len);
-
- *protocol = IPPROTO_UDP;
-
- return 0;
-}
-
int ip_tunnel_encap(struct sk_buff *skb, struct ip_tunnel *t,
u8 *protocol, struct flowi4 *fl4)
{
switch (t->encap.type) {
case TUNNEL_ENCAP_NONE:
return 0;
+#if IS_ENABLED(CONFIG_NET_FOU)
case TUNNEL_ENCAP_FOU:
+ return fou_build_header(skb, &t->encap, protocol, fl4);
case TUNNEL_ENCAP_GUE:
- return fou_build_header(skb, &t->encap, t->encap_hlen,
- protocol, fl4);
+ return gue_build_header(skb, &t->encap, protocol, fl4);
+#endif
default:
return -EINVAL;
}