mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-27 01:11:14 +00:00
167 lines
4.6 KiB
Diff
167 lines
4.6 KiB
Diff
--- /dev/null
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+++ b/include/net/xfrmudp.h
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@@ -0,0 +1,10 @@
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+/*
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+ * pointer to function for type that xfrm4_input wants, to permit
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+ * decoupling of XFRM from udp.c
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+ */
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+#define HAVE_XFRM4_UDP_REGISTER
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+
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+typedef int (*xfrm4_rcv_encap_t)(struct sk_buff *skb, __u16 encap_type);
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+extern int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
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+ , xfrm4_rcv_encap_t *oldfunc);
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+extern int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func);
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--- a/net/ipv4/Kconfig
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+++ b/net/ipv4/Kconfig
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@@ -266,6 +266,12 @@ config NET_IPGRE_BROADCAST
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Network), but can be distributed all over the Internet. If you want
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to do that, say Y here and to "IP multicast routing" below.
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+config IPSEC_NAT_TRAVERSAL
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+ bool "IPSEC NAT-Traversal (KLIPS compatible)"
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+ depends on INET
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+ ---help---
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+ Includes support for RFC3947/RFC3948 NAT-Traversal of ESP over UDP.
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+
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config IP_MROUTE
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bool "IP: multicast routing"
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depends on IP_MULTICAST
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--- a/net/ipv4/udp.c
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+++ b/net/ipv4/udp.c
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@@ -101,12 +101,15 @@
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#include <net/route.h>
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#include <net/checksum.h>
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#include <net/xfrm.h>
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+#include <net/xfrmudp.h>
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#include "udp_impl.h"
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/*
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* Snmp MIB for the UDP layer
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*/
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+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func;
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+
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DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
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struct hlist_head udp_hash[UDP_HTABLE_SIZE];
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@@ -915,6 +918,42 @@ int udp_disconnect(struct sock *sk, int
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return 0;
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}
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+#if defined(CONFIG_XFRM) || defined(CONFIG_IPSEC_NAT_TRAVERSAL)
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+
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+/* if XFRM isn't a module, then register it directly. */
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+#if 0 && !defined(CONFIG_XFRM_MODULE) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
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+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = xfrm4_rcv_encap;
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+#else
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+static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL;
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+#endif
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+
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+int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
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+ , xfrm4_rcv_encap_t *oldfunc)
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+{
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+ if(oldfunc != NULL) {
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+ *oldfunc = xfrm4_rcv_encap_func;
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+ }
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+
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+#if 0
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+ if(xfrm4_rcv_encap_func != NULL)
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+ return -1;
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+#endif
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+
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+ xfrm4_rcv_encap_func = func;
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+ return 0;
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+}
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+
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+int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func)
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+{
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+ if(xfrm4_rcv_encap_func != func)
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+ return -1;
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+
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+ xfrm4_rcv_encap_func = NULL;
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+ return 0;
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+}
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+#endif /* CONFIG_XFRM_MODULE || CONFIG_IPSEC_NAT_TRAVERSAL */
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+
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+
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/* return:
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* 1 if the the UDP system should process it
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* 0 if we should drop this packet
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@@ -922,7 +961,7 @@ int udp_disconnect(struct sock *sk, int
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*/
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static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
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{
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-#ifndef CONFIG_XFRM
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+#if !defined(CONFIG_XFRM) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
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return 1;
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#else
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struct udp_sock *up = udp_sk(sk);
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@@ -937,11 +976,11 @@ static int udp_encap_rcv(struct sock * s
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/* if we're overly short, let UDP handle it */
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len = skb->len - sizeof(struct udphdr);
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if (len <= 0)
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- return 1;
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+ return 2;
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/* if this is not encapsulated socket, then just return now */
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if (!encap_type)
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- return 1;
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+ return 3;
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/* If this is a paged skb, make sure we pull up
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* whatever data we need to look at. */
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@@ -964,7 +1003,7 @@ static int udp_encap_rcv(struct sock * s
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len = sizeof(struct udphdr);
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} else
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/* Must be an IKE packet.. pass it through */
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- return 1;
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+ return 4;
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break;
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case UDP_ENCAP_ESPINUDP_NON_IKE:
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/* Check if this is a keepalive packet. If so, eat it. */
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@@ -977,7 +1016,7 @@ static int udp_encap_rcv(struct sock * s
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len = sizeof(struct udphdr) + 2 * sizeof(u32);
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} else
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/* Must be an IKE packet.. pass it through */
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- return 1;
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+ return 5;
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break;
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}
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@@ -988,6 +1027,8 @@ static int udp_encap_rcv(struct sock * s
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*/
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if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
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return 0;
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+ if (skb_cloned(skb) && pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
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+ return 0;
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/* Now we can update and verify the packet length... */
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iph = skb->nh.iph;
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@@ -1051,9 +1092,13 @@ int udp_queue_rcv_skb(struct sock * sk,
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return 0;
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}
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if (ret < 0) {
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- /* process the ESP packet */
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- ret = xfrm4_rcv_encap(skb, up->encap_type);
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- UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
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+ if(xfrm4_rcv_encap_func != NULL) {
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+ ret = (*xfrm4_rcv_encap_func)(skb, up->encap_type);
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+ UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
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+ } else {
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+ UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
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+ ret = 1;
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+ }
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return -ret;
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}
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/* FALLTHROUGH -- it's a UDP Packet */
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@@ -1733,3 +1778,9 @@ EXPORT_SYMBOL(udp_poll);
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EXPORT_SYMBOL(udp_proc_register);
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EXPORT_SYMBOL(udp_proc_unregister);
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#endif
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+
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+#if defined(CONFIG_IPSEC_NAT_TRAVERSAL)
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+EXPORT_SYMBOL(udp4_register_esp_rcvencap);
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+EXPORT_SYMBOL(udp4_unregister_esp_rcvencap);
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+#endif
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+
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