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git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - net/ax25/ax25_ip.c
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
9 #include <linux/config.h>
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/socket.h>
14 #include <linux/kernel.h>
15 #include <linux/sched.h>
16 #include <linux/timer.h>
17 #include <linux/string.h>
18 #include <linux/sockios.h>
19 #include <linux/net.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/skbuff.h>
26 #include <asm/uaccess.h>
27 #include <asm/system.h>
28 #include <linux/fcntl.h>
29 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
31 #include <linux/interrupt.h>
32 #include <linux/notifier.h>
33 #include <linux/proc_fs.h>
34 #include <linux/stat.h>
35 #include <linux/netfilter.h>
36 #include <linux/sysctl.h>
41 * IP over AX.25 encapsulation.
45 * Shove an AX.25 UI header on an IP packet and handle ARP
50 int ax25_encapsulate(struct sk_buff
*skb
, struct net_device
*dev
, unsigned short type
, void *daddr
, void *saddr
, unsigned len
)
54 /* they sometimes come back to us... */
55 if (type
== ETH_P_AX25
)
58 /* header is an AX.25 UI frame from us to them */
59 buff
= skb_push(skb
, AX25_HEADER_LEN
);
60 *buff
++ = 0x00; /* KISS DATA */
63 memcpy(buff
, daddr
, dev
->addr_len
); /* Address specified */
65 buff
[6] &= ~AX25_CBIT
;
66 buff
[6] &= ~AX25_EBIT
;
67 buff
[6] |= AX25_SSSID_SPARE
;
68 buff
+= AX25_ADDR_LEN
;
71 memcpy(buff
, saddr
, dev
->addr_len
);
73 memcpy(buff
, dev
->dev_addr
, dev
->addr_len
);
75 buff
[6] &= ~AX25_CBIT
;
77 buff
[6] |= AX25_SSSID_SPARE
;
78 buff
+= AX25_ADDR_LEN
;
80 *buff
++ = AX25_UI
; /* UI */
82 /* Append a suitable AX.25 PID */
91 printk(KERN_ERR
"AX.25: ax25_encapsulate - wrong protocol type 0x%2.2x\n", type
);
97 return AX25_HEADER_LEN
;
99 return -AX25_HEADER_LEN
; /* Unfinished header */
102 int ax25_rebuild_header(struct sk_buff
*skb
)
104 struct sk_buff
*ourskb
;
105 unsigned char *bp
= skb
->data
;
106 struct net_device
*dev
;
107 ax25_address
*src
, *dst
;
109 ax25_route _route
, *route
= &_route
;
112 dst
= (ax25_address
*)(bp
+ 1);
113 src
= (ax25_address
*)(bp
+ 8);
115 if (arp_find(bp
+ 1, skb
))
118 route
= ax25_rt_find_route(route
, dst
, NULL
);
124 if ((ax25_dev
= ax25_dev_ax25dev(dev
)) == NULL
) {
128 if (bp
[16] == AX25_P_IP
) {
129 if (route
->ip_mode
== 'V' || (route
->ip_mode
== ' ' && ax25_dev
->values
[AX25_VALUES_IPDEFMODE
])) {
131 * We copy the buffer and release the original thereby
132 * keeping it straight
134 * Note: we report 1 back so the caller will
135 * not feed the frame direct to the physical device
136 * We don't want that to happen. (It won't be upset
137 * as we have pulled the frame from the queue by
140 * NB: TCP modifies buffers that are still
141 * on a device queue, thus we use skb_copy()
142 * instead of using skb_clone() unless this
149 if ((ourskb
= skb_copy(skb
, GFP_ATOMIC
)) == NULL
) {
155 skb_set_owner_w(ourskb
, skb
->sk
);
159 * after kfree_skb(), dst and src which were pointer
160 * to bp which is part of skb->data would not be valid
161 * anymore hope that after skb_pull(ourskb, ..) our
162 * dsc_c and src_c will not become invalid
165 dst_c
= *(ax25_address
*)(bp
+ 1);
166 src_c
= *(ax25_address
*)(bp
+ 8);
168 skb_pull(ourskb
, AX25_HEADER_LEN
- 1); /* Keep PID */
169 ourskb
->nh
.raw
= ourskb
->data
;
171 ax25
=ax25_send_frame(
173 ax25_dev
->values
[AX25_VALUES_PACLEN
],
175 &dst_c
, route
->digipeat
, dev
);
185 bp
[7] |= AX25_SSSID_SPARE
;
187 bp
[14] &= ~AX25_CBIT
;
189 bp
[14] |= AX25_SSSID_SPARE
;
191 skb_pull(skb
, AX25_KISS_HEADER_LEN
);
193 if (route
->digipeat
!= NULL
) {
194 if ((ourskb
= ax25_rt_build_path(skb
, src
, dst
, route
->digipeat
)) == NULL
) {
202 ax25_queue_xmit(skb
, dev
);
205 ax25_put_route(route
);
212 int ax25_encapsulate(struct sk_buff
*skb
, struct net_device
*dev
, unsigned short type
, void *daddr
, void *saddr
, unsigned len
)
214 return -AX25_HEADER_LEN
;
217 int ax25_rebuild_header(struct sk_buff
*skb
)