Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / ipv4 / xfrm4_tunnel.c

diff --git a/kernel/net/ipv4/xfrm4_tunnel.c b/kernel/net/ipv4/xfrm4_tunnel.c
new file mode 100644 (file)
index 0000000..06347db
--- /dev/null
+++ b/kernel/net/ipv4/xfrm4_tunnel.c
@@ -0,0 +1,117 @@
+/* xfrm4_tunnel.c: Generic IP tunnel transformer.
+ *
+ * Copyright (C) 2003 David S. Miller (davem@redhat.com)
+ */
+
+#define pr_fmt(fmt) "IPsec: " fmt
+
+#include <linux/skbuff.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <net/xfrm.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+
+static int ipip_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+       skb_push(skb, -skb_network_offset(skb));
+       return 0;
+}
+
+static int ipip_xfrm_rcv(struct xfrm_state *x, struct sk_buff *skb)
+{
+       return ip_hdr(skb)->protocol;
+}
+
+static int ipip_init_state(struct xfrm_state *x)
+{
+       if (x->props.mode != XFRM_MODE_TUNNEL)
+               return -EINVAL;
+
+       if (x->encap)
+               return -EINVAL;
+
+       x->props.header_len = sizeof(struct iphdr);
+
+       return 0;
+}
+
+static void ipip_destroy(struct xfrm_state *x)
+{
+}
+
+static const struct xfrm_type ipip_type = {
+       .description    = "IPIP",
+       .owner          = THIS_MODULE,
+       .proto          = IPPROTO_IPIP,
+       .init_state     = ipip_init_state,
+       .destructor     = ipip_destroy,
+       .input          = ipip_xfrm_rcv,
+       .output         = ipip_output
+};
+
+static int xfrm_tunnel_rcv(struct sk_buff *skb)
+{
+       return xfrm4_rcv_spi(skb, IPPROTO_IPIP, ip_hdr(skb)->saddr);
+}
+
+static int xfrm_tunnel_err(struct sk_buff *skb, u32 info)
+{
+       return -ENOENT;
+}
+
+static struct xfrm_tunnel xfrm_tunnel_handler __read_mostly = {
+       .handler        =       xfrm_tunnel_rcv,
+       .err_handler    =       xfrm_tunnel_err,
+       .priority       =       3,
+};
+
+#if IS_ENABLED(CONFIG_IPV6)
+static struct xfrm_tunnel xfrm64_tunnel_handler __read_mostly = {
+       .handler        =       xfrm_tunnel_rcv,
+       .err_handler    =       xfrm_tunnel_err,
+       .priority       =       2,
+};
+#endif
+
+static int __init ipip_init(void)
+{
+       if (xfrm_register_type(&ipip_type, AF_INET) < 0) {
+               pr_info("%s: can't add xfrm type\n", __func__);
+               return -EAGAIN;
+       }
+
+       if (xfrm4_tunnel_register(&xfrm_tunnel_handler, AF_INET)) {
+               pr_info("%s: can't add xfrm handler for AF_INET\n", __func__);
+               xfrm_unregister_type(&ipip_type, AF_INET);
+               return -EAGAIN;
+       }
+#if IS_ENABLED(CONFIG_IPV6)
+       if (xfrm4_tunnel_register(&xfrm64_tunnel_handler, AF_INET6)) {
+               pr_info("%s: can't add xfrm handler for AF_INET6\n", __func__);
+               xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET);
+               xfrm_unregister_type(&ipip_type, AF_INET);
+               return -EAGAIN;
+       }
+#endif
+       return 0;
+}
+
+static void __exit ipip_fini(void)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+       if (xfrm4_tunnel_deregister(&xfrm64_tunnel_handler, AF_INET6))
+               pr_info("%s: can't remove xfrm handler for AF_INET6\n",
+                       __func__);
+#endif
+       if (xfrm4_tunnel_deregister(&xfrm_tunnel_handler, AF_INET))
+               pr_info("%s: can't remove xfrm handler for AF_INET\n",
+                       __func__);
+       if (xfrm_unregister_type(&ipip_type, AF_INET) < 0)
+               pr_info("%s: can't remove xfrm type\n", __func__);
+}
+
+module_init(ipip_init);
+module_exit(ipip_fini);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_IPIP);