package/openswan/linux-2.6.20-openswan-2.4.7.kernel-2.6-natt.patch

   1 packaging/utils/nattpatch 2.6
   2 --- /dev/null   Tue Mar 11 13:02:56 2003
   3 +++ nat-t/include/net/xfrmudp.h     Mon Feb  9 13:51:03 2004
   4 @@ -0,0 +1,10 @@
   5 +/*
   6 + * pointer to function for type that xfrm4_input wants, to permit
   7 + * decoupling of XFRM from udp.c
   8 + */
   9 +#define HAVE_XFRM4_UDP_REGISTER
  10 +
  11 +typedef int (*xfrm4_rcv_encap_t)(struct sk_buff *skb, __u16 encap_type);
  12 +extern int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
  13 +                                     , xfrm4_rcv_encap_t *oldfunc);
  14 +extern int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func);
  15 --- /distros/kernel/linux-2.6.11.2/net/ipv4/Kconfig     2005-03-09 03:12:33.000000000 -0500
  16 +++ swan26/net/ipv4/Kconfig     2005-04-04 18:46:13.000000000 -0400
  17 @@ -351,2 +351,8 @@
  18
  19 +config IPSEC_NAT_TRAVERSAL
  20 +       bool "IPSEC NAT-Traversal (KLIPS compatible)"
  21 +       depends on INET
  22 +       ---help---
  23 +          Includes support for RFC3947/RFC3948 NAT-Traversal of ESP over UDP.
  24 +
  25  config IP_TCPDIAG
  26 --- plain26/net/ipv4/udp.c.orig 2006-01-02 22:21:10.000000000 -0500
  27 +++ plain26/net/ipv4/udp.c      2006-01-10 20:07:21.000000000 -0500
  28 @@ -108,11 +108,14 @@
  29  #include <net/checksum.h>
  30  #include <net/xfrm.h>
  31 +#include <net/xfrmudp.h>
  32  #include "udp_impl.h"
  33
  34  /*
  35   *     Snmp MIB for the UDP layer
  36   */
  37
  38 +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func;
  39 +
  40  DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
  41
  42  struct hlist_head udp_hash[UDP_HTABLE_SIZE];
  43 @@ -894,6 +897,42 @@
  44         sk_common_release(sk);
  45  }
  46
  47 +#if defined(CONFIG_XFRM) || defined(CONFIG_IPSEC_NAT_TRAVERSAL)
  48 +
  49 +/* if XFRM isn't a module, then register it directly. */
  50 +#if 0 && !defined(CONFIG_XFRM_MODULE) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
  51 +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = xfrm4_rcv_encap;
  52 +#else
  53 +static xfrm4_rcv_encap_t xfrm4_rcv_encap_func = NULL;
  54 +#endif
  55 +
  56 +int udp4_register_esp_rcvencap(xfrm4_rcv_encap_t func
  57 +                              , xfrm4_rcv_encap_t *oldfunc)
  58 +{
  59 +  if(oldfunc != NULL) {
  60 +    *oldfunc = xfrm4_rcv_encap_func;
  61 +  }
  62 +
  63 +#if 0
  64 +  if(xfrm4_rcv_encap_func != NULL)
  65 +    return -1;
  66 +#endif
  67 +
  68 +  xfrm4_rcv_encap_func = func;
  69 +  return 0;
  70 +}
  71 +
  72 +int udp4_unregister_esp_rcvencap(xfrm4_rcv_encap_t func)
  73 +{
  74 +  if(xfrm4_rcv_encap_func != func)
  75 +    return -1;
  76 +
  77 +  xfrm4_rcv_encap_func = NULL;
  78 +  return 0;
  79 +}
  80 +#endif /* CONFIG_XFRM_MODULE || CONFIG_IPSEC_NAT_TRAVERSAL */
  81 +
  82 +
  83  /* return:
  84   *     1  if the the UDP system should process it
  85   *     0  if we should drop this packet
  86 @@ -901,9 +940,9 @@
  87   */
  88  static int udp_encap_rcv(struct sock * sk, struct sk_buff *skb)
  89  {
  90 -#ifndef CONFIG_XFRM
  91 +#if !defined(CONFIG_XFRM) && !defined(CONFIG_IPSEC_NAT_TRAVERSAL)
  92         return 1;
  93 -#else
  94 +#else /* either CONFIG_XFRM or CONFIG_IPSEC_NAT_TRAVERSAL */
  95         struct udp_sock *up = udp_sk(sk);
  96         struct udphdr *uh = skb->h.uh;
  97         struct iphdr *iph;
  98 @@ -915,11 +954,11 @@
  99         /* if we're overly short, let UDP handle it */
 100         len = skb->len - sizeof(struct udphdr);
 101         if (len <= 0)
 102 -               return 1;
 103 +               return 2;
 104
 105         /* if this is not encapsulated socket, then just return now */
 106         if (!encap_type)
 107 -               return 1;
 108 +               return 3;
 109
 110         /* If this is a paged skb, make sure we pull up
 111          * whatever data we need to look at. */
 112 @@ -934,7 +973,7 @@
 113                         len = sizeof(struct udphdr);
 114                 } else
 115                         /* Must be an IKE packet.. pass it through */
 116 -                       return 1;
 117 +                       return 4;
 118                 break;
 119         case UDP_ENCAP_ESPINUDP_NON_IKE:
 120                 /* Check if this is a keepalive packet.  If so, eat it. */
 121 @@ -947,7 +986,7 @@
 122                         len = sizeof(struct udphdr) + 2 * sizeof(u32);
 123                 } else
 124                         /* Must be an IKE packet.. pass it through */
 125 -                       return 1;
 126 +                       return 5;
 127                 break;
 128         }
 129
 130 @@ -1021,10 +1060,14 @@
 131                         return 0;
 132                 }
 133                 if (ret < 0) {
 134 -                       /* process the ESP packet */
 135 -                       ret = xfrm4_rcv_encap(skb, up->encap_type);
 136 -                       UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
 137 -                       return -ret;
 138 +                       if(xfrm4_rcv_encap_func != NULL) {
 139 +                         ret = (*xfrm4_rcv_encap_func)(skb, up->encap_type);
 140 +                         UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS, up->pcflag);
 141 +                       } else {
 142 +                         UDP_INC_STATS_BH(UDP_MIB_INERRORS, up->pcflag);
 143 +                         ret = 1;
 144 +                       }
 145 +                       return ret;
 146                 }
 147                 /* FALLTHROUGH -- it's a UDP Packet */
 148         }
 149 @@ -1571,3 +1613,9 @@
 150  EXPORT_SYMBOL(udp_proc_register);
 151  EXPORT_SYMBOL(udp_proc_unregister);
 152  #endif
 153 +
 154 +#if defined(CONFIG_IPSEC_NAT_TRAVERSAL)
 155 +EXPORT_SYMBOL(udp4_register_esp_rcvencap);
 156 +EXPORT_SYMBOL(udp4_unregister_esp_rcvencap);
 157 +#endif
 158 +