| diff -rduNp linux-2.6.21.5.orig/include/net/xfrmudp.h linux-2.6.21.5/include/net/xfrmudp.h |
| --- linux-2.6.21.5.orig/include/net/xfrmudp.h 1970-01-01 01:00:00.000000000 +0100 |
| +++ linux-2.6.21.5/include/net/xfrmudp.h 2007-06-21 10:53:38.000000000 +0200 |
| @@ -0,0 +1,10 @@ |
| +/* |
| + * pointer to function for type that xfrm4_input wants, to permit |
| + * decoupling of XFRM from udp.c |
| + */ |
| +#define HAVE_XFRM4_UDP_REGISTER |
| + |
| +typedef int (*xfrm4_rcv_encap_t)(struct sk_buff *skb, __u16 encap_type); |
| +extern int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func |
| + , xfrm4_rcv_encap_t *oldfunc); |
| +extern int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func); |
| diff -rduNp linux-2.6.21.5.orig/net/ipv4/Kconfig linux-2.6.21.5/net/ipv4/Kconfig |
| --- linux-2.6.21.5.orig/net/ipv4/Kconfig 2007-06-11 20:37:06.000000000 +0200 |
| +++ linux-2.6.21.5/net/ipv4/Kconfig 2007-06-21 10:53:38.000000000 +0200 |
| @@ -349,6 +349,12 @@ config SYN_COOKIES |
| be taken as absolute truth. |
| |
| SYN cookies may prevent correct error reporting on clients when the |
| +config IPSEC_NAT_TRAVERSAL |
| + bool "IPSEC NAT-Traversal (KLIPS compatible)" |
| + depends on INET |
| + ---help--- |
| + Includes support for RFC3947/RFC3948 NAT-Traversal of ESP over UDP. |
| + |
| server is really overloaded. If this happens frequently better turn |
| them off. |
| |
| diff -rduNp linux-2.6.21.5.orig/net/ipv4/udp.c linux-2.6.21.5/net/ipv4/udp.c |
| --- linux-2.6.21.5.orig/net/ipv4/udp.c 2007-06-11 20:37:06.000000000 +0200 |
| +++ linux-2.6.21.5/net/ipv4/udp.c 2007-06-21 10:56:18.000000000 +0200 |
| @@ -108,6 +108,7 @@ |
| */ |
| |
| DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly; |
| +#include <net/xfrmudp.h> |
| |
| struct hlist_head udp_hash[UDP_HTABLE_SIZE]; |
| DEFINE_RWLOCK(udp_hash_lock); |
| @@ -915,6 +916,44 @@ int udp_disconnect(struct sock *sk, int |
| return 0; |
| } |
| |
| +#if defined(CONFIG_XFRM) || defined(CONFIG_IPSEC_NAT_TRAVERSAL) |
| + |
| +/* if XFRM isn't a module, then register it directly. */ |
| +#if !defined(CONFIG_XFRM_MODULE) |
| +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = xfrm4_rcv_encap; |
| +#else |
| +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL; |
| +#endif |
| + |
| +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func; |
| + |
| +int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func |
| + , xfrm4_rcv_encap_t *oldfunc) |
| +{ |
| + if(oldfunc != NULL) { |
| + *oldfunc = xfrm4_rcv_encap_func; |
| + } |
| + |
| +#if 0 |
| + if(xfrm4_rcv_encap_func != NULL) |
| + return -1; |
| +#endif |
| + |
| + xfrm4_rcv_encap_func = func; |
| + return 0; |
| +} |
| + |
| +int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func) |
| +{ |
| + if(xfrm4_rcv_encap_func != func) |
| + return -1; |
| + |
| + xfrm4_rcv_encap_func = NULL; |
| + return 0; |
| +} |
| +#endif /* CONFIG_XFRM || defined(CONFIG_IPSEC_NAT_TRAVERSAL)*/ |
| + |
| + |
| /* return: |
| * 1 if the the UDP system should process it |
| * 0 if we should drop this packet |
| @@ -922,9 +961,9 @@ int udp_disconnect(struct sock *sk, int |
| */ |
| static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb) |
| { |
| -#ifndef CONFIG_XFRM |
| +#if !defined(CONFIG_XFRM) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL) |
| return 1; |
| -#else |
| +#else /* either CONFIG_XFRM or CONFIG_IPSEC_NAT_TRAVERSAL */ |
| struct udp_sock *up = udp_sk(sk); |
| struct udphdr *uh; |
| struct iphdr *iph; |
| @@ -1052,9 +1091,14 @@ int udp_queue_rcv_skb(struct sock * sk, |
| } |
| if (ret < 0) { |
| /* process the ESP packet */ |
| - ret = xfrm4_rcv_encap(skb, up->encap_type); |
| - UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); |
| - return -ret; |
| + if (xfrm4_rcv_encap_func != NULL) { |
| + ret = (*xfrm4_rcv_encap_func)(skb, up->encap_type); |
| + UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag); |
| + } else { |
| + UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag); |
| + ret = 1; |
| + } |
| + return ret; |
| } |
| /* FALLTHROUGH -- it's a UDP Packet */ |
| } |
| @@ -1733,3 +1777,9 @@ EXPORT_SYMBOL(udp_poll); |
| EXPORT_SYMBOL(udp_proc_register); |
| EXPORT_SYMBOL(udp_proc_unregister); |
| #endif |
| + |
| +#if defined(CONFIG_IPSEC_NAT_TRAVERSAL) |
| +EXPORT_SYMBOL(udp4_register_esp_rcvencap); |
| +EXPORT_SYMBOL(udp4_unregister_esp_rcvencap); |
| +#endif |
| + |