[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/os/linux/linux-3.4.x/net/ipv4/tunnel4.c b/ap/os/linux/linux-3.4.x/net/ipv4/tunnel4.c
new file mode 100644
index 0000000..0d01718
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/net/ipv4/tunnel4.c
@@ -0,0 +1,192 @@
+/* tunnel4.c: Generic IP tunnel transformer.
+ *
+ * Copyright (C) 2003 David S. Miller (davem@redhat.com)
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/slab.h>
+#include <net/icmp.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <net/xfrm.h>
+
+static struct xfrm_tunnel __rcu *tunnel4_handlers __read_mostly;
+static struct xfrm_tunnel __rcu *tunnel64_handlers __read_mostly;
+static DEFINE_MUTEX(tunnel4_mutex);
+
+static inline struct xfrm_tunnel __rcu **fam_handlers(unsigned short family)
+{
+ return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
+}
+
+int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
+{
+ struct xfrm_tunnel __rcu **pprev;
+ struct xfrm_tunnel *t;
+
+ int ret = -EEXIST;
+ int priority = handler->priority;
+
+ mutex_lock(&tunnel4_mutex);
+
+ for (pprev = fam_handlers(family);
+ (t = rcu_dereference_protected(*pprev,
+ lockdep_is_held(&tunnel4_mutex))) != NULL;
+ pprev = &t->next) {
+ if (t->priority > priority)
+ break;
+ if (t->priority == priority)
+ goto err;
+ }
+
+ handler->next = *pprev;
+ rcu_assign_pointer(*pprev, handler);
+
+ ret = 0;
+
+err:
+ mutex_unlock(&tunnel4_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL(xfrm4_tunnel_register);
+
+int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family)
+{
+ struct xfrm_tunnel __rcu **pprev;
+ struct xfrm_tunnel *t;
+ int ret = -ENOENT;
+
+ mutex_lock(&tunnel4_mutex);
+
+ for (pprev = fam_handlers(family);
+ (t = rcu_dereference_protected(*pprev,
+ lockdep_is_held(&tunnel4_mutex))) != NULL;
+ pprev = &t->next) {
+ if (t == handler) {
+ *pprev = handler->next;
+ ret = 0;
+ break;
+ }
+ }
+
+ mutex_unlock(&tunnel4_mutex);
+
+ synchronize_net();
+
+ return ret;
+}
+EXPORT_SYMBOL(xfrm4_tunnel_deregister);
+
+#define for_each_tunnel_rcu(head, handler) \
+ for (handler = rcu_dereference(head); \
+ handler != NULL; \
+ handler = rcu_dereference(handler->next)) \
+
+static int tunnel4_rcv(struct sk_buff *skb)
+{
+ struct xfrm_tunnel *handler;
+
+ if (!pskb_may_pull(skb, sizeof(struct iphdr)))
+ goto drop;
+
+ for_each_tunnel_rcu(tunnel4_handlers, handler)
+ if (!handler->handler(skb))
+ return 0;
+
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static int tunnel64_rcv(struct sk_buff *skb)
+{
+ struct xfrm_tunnel *handler;
+
+ if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
+ goto drop;
+
+ for_each_tunnel_rcu(tunnel64_handlers, handler)
+ if (!handler->handler(skb))
+ return 0;
+
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+drop:
+ kfree_skb(skb);
+ return 0;
+}
+#endif
+
+static void tunnel4_err(struct sk_buff *skb, u32 info)
+{
+ struct xfrm_tunnel *handler;
+
+ for_each_tunnel_rcu(tunnel4_handlers, handler)
+ if (!handler->err_handler(skb, info))
+ break;
+}
+
+#if IS_ENABLED(CONFIG_IPV6)
+static void tunnel64_err(struct sk_buff *skb, u32 info)
+{
+ struct xfrm_tunnel *handler;
+
+ for_each_tunnel_rcu(tunnel64_handlers, handler)
+ if (!handler->err_handler(skb, info))
+ break;
+}
+#endif
+
+static const struct net_protocol tunnel4_protocol = {
+ .handler = tunnel4_rcv,
+ .err_handler = tunnel4_err,
+ .no_policy = 1,
+ .netns_ok = 1,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static const struct net_protocol tunnel64_protocol = {
+ .handler = tunnel64_rcv,
+ .err_handler = tunnel64_err,
+ .no_policy = 1,
+ .netns_ok = 1,
+};
+#endif
+
+static int __init tunnel4_init(void)
+{
+ if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) {
+ pr_err("%s: can't add protocol\n", __func__);
+ return -EAGAIN;
+ }
+#if IS_ENABLED(CONFIG_IPV6)
+ if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
+ pr_err("tunnel64 init: can't add protocol\n");
+ inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
+ return -EAGAIN;
+ }
+#endif
+ return 0;
+}
+
+static void __exit tunnel4_fini(void)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
+ pr_err("tunnel64 close: can't remove protocol\n");
+#endif
+ if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP))
+ pr_err("tunnel4 close: can't remove protocol\n");
+}
+
+module_init(tunnel4_init);
+module_exit(tunnel4_fini);
+MODULE_LICENSE("GPL");