target/linux/generic-2.6/patches-2.6.23/120-openswan-2.4.0.kernel-2.6-natt.patch

   1 --- /dev/null
   2 +++ b/include/net/xfrmudp.h
   3 @@ -0,0 +1,10 @@
   4 +/*
   5 + * pointer to function for type that xfrm4_input wants, to permit
   6 + * decoupling of XFRM from udp.c
   7 + */
   8 +#define HAVE_XFRM4_UDP_REGISTER
   9 +
  10 +typedef int (*xfrm4_rcv_encap_t)(struct sk_buff *skb, __u16 encap_type);
  11 +extern int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
  12 +                                     , xfrm4_rcv_encap_t *oldfunc);
  13 +extern int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func);
  14 --- a/net/ipv4/Kconfig
  15 +++ b/net/ipv4/Kconfig
  16 @@ -224,6 +224,12 @@
  17           Network), but can be distributed all over the Internet. If you want
  18           to do that, say Y here and to "IP multicast routing" below.
  19
  20 +config IPSEC_NAT_TRAVERSAL
  21 +       bool "IPSEC NAT-Traversal (KLIPS compatible)"
  22 +       depends on INET
  23 +       ---help---
  24 +          Includes support for RFC3947/RFC3948 NAT-Traversal of ESP over UDP.
  25 +
  26  config IP_MROUTE
  27         bool "IP: multicast routing"
  28         depends on IP_MULTICAST
  29 --- a/net/ipv4/xfrm4_input.c
  30 +++ b/net/ipv4/xfrm4_input.c
  31 @@ -15,6 +15,7 @@
  32  #include <linux/netfilter_ipv4.h>
  33  #include <net/ip.h>
  34  #include <net/xfrm.h>
  35 +#include <net/xfrmudp.h>
  36
  37  static int xfrm4_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq)
  38  {
  39 @@ -161,6 +162,29 @@
  40         return 0;
  41  }
  42
  43 +#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
  44 +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL;
  45 +
  46 +int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func,
  47 +                              xfrm4_rcv_encap_t *oldfunc)
  48 +{
  49 +       if(oldfunc != NULL)
  50 +               *oldfunc = xfrm4_rcv_encap_func;
  51 +
  52 +       xfrm4_rcv_encap_func = func;
  53 +       return 0;
  54 +}
  55 +
  56 +int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func)
  57 +{
  58 +       if(xfrm4_rcv_encap_func != func)
  59 +               return -1;
  60 +
  61 +       xfrm4_rcv_encap_func = NULL;
  62 +       return 0;
  63 +}
  64 +#endif /* CONFIG_IPSEC_NAT_TRAVERSAL */
  65 +
  66  /* If it's a keepalive packet, then just eat it.
  67   * If it's an encapsulated packet, then pass it to the
  68   * IPsec xfrm input.
  69 @@ -251,7 +275,13 @@
  70         iph->protocol = IPPROTO_ESP;
  71
  72         /* process ESP */
  73 +#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
  74 +       if(xfrm4_rcv_encap_func == NULL)
  75 +               goto drop;
  76 +       ret = (*xfrm4_rcv_encap_func)(skb, up->encap_type);
  77 +#else
  78         ret = xfrm4_rcv_encap(skb, encap_type);
  79 +#endif
  80         return ret;
  81
  82  drop:
  83 @@ -265,3 +295,8 @@
  84  }
  85
  86  EXPORT_SYMBOL(xfrm4_rcv);
  87 +
  88 +#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
  89 +EXPORT_SYMBOL(udp4_register_esp_rcvencap);
  90 +EXPORT_SYMBOL(udp4_unregister_esp_rcvencap);
  91 +#endif