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Diffstat (limited to 'net/ipv4/ip_tunnel.c')
-rw-r--r--net/ipv4/ip_tunnel.c115
1 files changed, 53 insertions, 62 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 0bb8e141eacc..63e745aadab6 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -56,7 +56,6 @@
#include <net/netns/generic.h>
#include <net/rtnetlink.h>
#include <net/udp.h>
-#include <net/gue.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
@@ -491,18 +490,51 @@ EXPORT_SYMBOL_GPL(ip_tunnel_rcv);
static int ip_encap_hlen(struct ip_tunnel_encap *e)
{
- switch (e->type) {
- case TUNNEL_ENCAP_NONE:
+ const struct ip_tunnel_encap_ops *ops;
+ int hlen = -EINVAL;
+
+ if (e->type == TUNNEL_ENCAP_NONE)
return 0;
- case TUNNEL_ENCAP_FOU:
- return sizeof(struct udphdr);
- case TUNNEL_ENCAP_GUE:
- return sizeof(struct udphdr) + sizeof(struct guehdr);
- default:
+
+ if (e->type >= MAX_IPTUN_ENCAP_OPS)
return -EINVAL;
- }
+
+ rcu_read_lock();
+ ops = rcu_dereference(iptun_encaps[e->type]);
+ if (likely(ops && ops->encap_hlen))
+ hlen = ops->encap_hlen(e);
+ rcu_read_unlock();
+
+ return hlen;
}
+const struct ip_tunnel_encap_ops __rcu *
+ iptun_encaps[MAX_IPTUN_ENCAP_OPS] __read_mostly;
+
+int ip_tunnel_encap_add_ops(const struct ip_tunnel_encap_ops *ops,
+ unsigned int num)
+{
+ return !cmpxchg((const struct ip_tunnel_encap_ops **)
+ &iptun_encaps[num],
+ NULL, ops) ? 0 : -1;
+}
+EXPORT_SYMBOL(ip_tunnel_encap_add_ops);
+
+int ip_tunnel_encap_del_ops(const struct ip_tunnel_encap_ops *ops,
+ unsigned int num)
+{
+ int ret;
+
+ ret = (cmpxchg((const struct ip_tunnel_encap_ops **)
+ &iptun_encaps[num],
+ ops, NULL) == ops) ? 0 : -1;
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(ip_tunnel_encap_del_ops);
+
int ip_tunnel_encap_setup(struct ip_tunnel *t,
struct ip_tunnel_encap *ipencap)
{
@@ -526,63 +558,22 @@ 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:
+ const struct ip_tunnel_encap_ops *ops;
+ int ret = -EINVAL;
+
+ if (t->encap.type == TUNNEL_ENCAP_NONE)
return 0;
- case TUNNEL_ENCAP_FOU:
- case TUNNEL_ENCAP_GUE:
- return fou_build_header(skb, &t->encap, t->encap_hlen,
- protocol, fl4);
- default:
- return -EINVAL;
- }
+
+ rcu_read_lock();
+ ops = rcu_dereference(iptun_encaps[t->encap.type]);
+ if (likely(ops && ops->build_header))
+ ret = ops->build_header(skb, &t->encap, protocol, fl4);
+ rcu_read_unlock();
+
+ return ret;
}
EXPORT_SYMBOL(ip_tunnel_encap);