finally move buildroot-ng to trunk
[openwrt.git] / target / linux / generic-2.4 / patches / 109-ipsec_nat_traversal.patch
1 packaging/utils/nattpatch 2.4
2 --- linux/include/net/sock.h    2002/02/06 15:25:10     1.1
3 +++ linux/include/net/sock.h    2002/05/22 12:14:56
4 @@ -488,7 +488,13 @@
5         } bictcp;
6  };
7  
8 -       
9 +#if 1
10 +#define UDP_OPT_IN_SOCK 1
11 +struct udp_opt {
12 +       __u32 esp_in_udp;
13 +};
14 +#endif
15 +
16  /*
17   * This structure really needs to be cleaned up.
18   * Most of it is for TCP, and not used by any of
19 @@ -655,6 +661,9 @@
20  #if defined(CONFIG_SPX) || defined (CONFIG_SPX_MODULE)
21                 struct spx_opt          af_spx;
22  #endif /* CONFIG_SPX */
23 +#if 1
24 +               struct udp_opt          af_udp;
25 +#endif
26  
27         } tp_pinfo;
28  
29 --- linux/net/Config.in.orig    Fri Feb  9 14:34:13 2001
30 +++ linux/net/Config.in Thu Feb 22 19:40:08 2001
31 @@ -88,3 +88,5 @@
32  endmenu
33  
34 +bool 'IPSEC NAT-Traversal' CONFIG_IPSEC_NAT_TRAVERSAL
35 +
36  endmenu
37 --- linux/net/ipv4/udp.c.1      Wed Jan 28 15:57:05 2004
38 +++ linux/net/ipv4/udp.c        Wed Jan 28 15:58:56 2004
39 @@ -787,6 +787,9 @@
40  
41  static int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
42  {
43 +#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
44 +       struct udp_opt *tp =  &(sk->tp_pinfo.af_udp);
45 +#endif
46         /*
47          *      Charge it to the socket, dropping if the queue is full.
48          */
49 @@ -804,6 +807,40 @@
50         }
51  #endif
52  
53 +#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
54 +       if (tp->esp_in_udp) {
55 +               /*
56 +                * Set skb->sk and xmit packet to ipsec_rcv.
57 +                *
58 +                * If ret != 0, ipsec_rcv refused the packet (not ESPinUDP),
59 +                * restore skb->sk and fall back to sock_queue_rcv_skb
60 +                */
61 +               struct inet_protocol *esp = NULL;
62 +
63 +#if defined(CONFIG_KLIPS) && !defined(CONFIG_KLIPS_MODULE)
64 +               /* optomize only when we know it is statically linked */
65 +               extern struct inet_protocol esp_protocol;
66 +               esp = &esp_protocol;
67 +#else
68 +               for (esp = (struct inet_protocol *)inet_protos[IPPROTO_ESP & (MAX_INET_PROTOS - 1)];
69 +                       (esp) && (esp->protocol != IPPROTO_ESP);
70 +                       esp = esp->next);
71 +#endif
72 +
73 +               if (esp && esp->handler) {
74 +                       struct sock *sav_sk = skb->sk;
75 +                       skb->sk = sk;
76 +                       if (esp->handler(skb) == 0) {
77 +                               skb->sk = sav_sk;
78 +                               /*not sure we might count ESPinUDP as UDP...*/
79 +                               UDP_INC_STATS_BH(UdpInDatagrams);
80 +                               return 0;
81 +                       }
82 +                       skb->sk = sav_sk;
83 +               }
84 +       }
85 +#endif
86 +
87         if (sock_queue_rcv_skb(sk,skb)<0) {
88                 UDP_INC_STATS_BH(UdpInErrors);
89                 IP_INC_STATS_BH(IpInDiscards);
90 @@ -1027,13 +1064,49 @@
91         return len;
92  }
93  
94 +static int udp_setsockopt(struct sock *sk, int level, int optname,
95 +       char *optval, int optlen)
96 +{
97 +       struct udp_opt *tp = &(sk->tp_pinfo.af_udp);
98 +       int val;
99 +       int err = 0;
100 +
101 +       if (level != SOL_UDP)
102 +               return ip_setsockopt(sk, level, optname, optval, optlen);
103 +
104 +       if(optlen<sizeof(int))
105 +               return -EINVAL;
106 +
107 +       if (get_user(val, (int *)optval))
108 +               return -EFAULT;
109 +       
110 +       lock_sock(sk);
111 +
112 +       switch(optname) {
113 +#ifdef CONFIG_IPSEC_NAT_TRAVERSAL
114 +#ifndef UDP_ESPINUDP
115 +#define UDP_ESPINUDP 100
116 +#endif
117 +               case UDP_ESPINUDP:
118 +                       tp->esp_in_udp = val;
119 +                       break;
120 +#endif
121 +               default:
122 +                       err = -ENOPROTOOPT;
123 +                       break;
124 +       }
125 +
126 +       release_sock(sk);
127 +       return err;
128 +}
129 +
130  struct proto udp_prot = {
131         name:           "UDP",
132         close:          udp_close,
133         connect:        udp_connect,
134         disconnect:     udp_disconnect,
135         ioctl:          udp_ioctl,
136 -       setsockopt:     ip_setsockopt,
137 +       setsockopt:     udp_setsockopt,
138         getsockopt:     ip_getsockopt,
139         sendmsg:        udp_sendmsg,
140         recvmsg:        udp_recvmsg,