ia64/linux-2.6.18-xen.hg

view net/ax25/ax25_ip.c @ 673:3161879fdf22

[IA64] xencomm: support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap

support XENMEM_add_to_physmap and XENMEM_remove_from_phsymap.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
author Isaku Yamahata <yamahata@valinux.co.jp>
date Tue Sep 16 21:26:15 2008 +0900 (2008-09-16)
parents 831230e53067
children
line source
1 /*
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.
6 *
7 * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
8 */
9 #include <linux/errno.h>
10 #include <linux/types.h>
11 #include <linux/socket.h>
12 #include <linux/in.h>
13 #include <linux/kernel.h>
14 #include <linux/module.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>
20 #include <net/ax25.h>
21 #include <linux/inet.h>
22 #include <linux/netdevice.h>
23 #include <linux/if_arp.h>
24 #include <linux/skbuff.h>
25 #include <net/sock.h>
26 #include <asm/uaccess.h>
27 #include <asm/system.h>
28 #include <linux/fcntl.h>
29 #include <linux/termios.h> /* For TIOCINQ/OUTQ */
30 #include <linux/mm.h>
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>
37 #include <net/ip.h>
38 #include <net/arp.h>
40 /*
41 * IP over AX.25 encapsulation.
42 */
44 /*
45 * Shove an AX.25 UI header on an IP packet and handle ARP
46 */
48 #ifdef CONFIG_INET
50 int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
51 {
52 unsigned char *buff;
54 /* they sometimes come back to us... */
55 if (type == ETH_P_AX25)
56 return 0;
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 */
62 if (daddr != NULL)
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;
70 if (saddr != NULL)
71 memcpy(buff, saddr, dev->addr_len);
72 else
73 memcpy(buff, dev->dev_addr, dev->addr_len);
75 buff[6] &= ~AX25_CBIT;
76 buff[6] |= AX25_EBIT;
77 buff[6] |= AX25_SSSID_SPARE;
78 buff += AX25_ADDR_LEN;
80 *buff++ = AX25_UI; /* UI */
82 /* Append a suitable AX.25 PID */
83 switch (type) {
84 case ETH_P_IP:
85 *buff++ = AX25_P_IP;
86 break;
87 case ETH_P_ARP:
88 *buff++ = AX25_P_ARP;
89 break;
90 default:
91 printk(KERN_ERR "AX.25: ax25_hard_header - wrong protocol type 0x%2.2x\n", type);
92 *buff++ = 0;
93 break;
94 }
96 if (daddr != NULL)
97 return AX25_HEADER_LEN;
99 return -AX25_HEADER_LEN; /* Unfinished header */
100 }
102 int ax25_rebuild_header(struct sk_buff *skb)
103 {
104 struct sk_buff *ourskb;
105 unsigned char *bp = skb->data;
106 ax25_route *route;
107 struct net_device *dev = NULL;
108 ax25_address *src, *dst;
109 ax25_digi *digipeat = NULL;
110 ax25_dev *ax25_dev;
111 ax25_cb *ax25;
112 char ip_mode = ' ';
114 dst = (ax25_address *)(bp + 1);
115 src = (ax25_address *)(bp + 8);
117 if (arp_find(bp + 1, skb))
118 return 1;
120 route = ax25_get_route(dst, NULL);
121 if (route) {
122 digipeat = route->digipeat;
123 dev = route->dev;
124 ip_mode = route->ip_mode;
125 };
127 if (dev == NULL)
128 dev = skb->dev;
130 if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL) {
131 goto put;
132 }
134 if (bp[16] == AX25_P_IP) {
135 if (ip_mode == 'V' || (ip_mode == ' ' && ax25_dev->values[AX25_VALUES_IPDEFMODE])) {
136 /*
137 * We copy the buffer and release the original thereby
138 * keeping it straight
139 *
140 * Note: we report 1 back so the caller will
141 * not feed the frame direct to the physical device
142 * We don't want that to happen. (It won't be upset
143 * as we have pulled the frame from the queue by
144 * freeing it).
145 *
146 * NB: TCP modifies buffers that are still
147 * on a device queue, thus we use skb_copy()
148 * instead of using skb_clone() unless this
149 * gets fixed.
150 */
152 ax25_address src_c;
153 ax25_address dst_c;
155 if ((ourskb = skb_copy(skb, GFP_ATOMIC)) == NULL) {
156 kfree_skb(skb);
157 goto put;
158 }
160 if (skb->sk != NULL)
161 skb_set_owner_w(ourskb, skb->sk);
163 kfree_skb(skb);
164 /* dl9sau: bugfix
165 * after kfree_skb(), dst and src which were pointer
166 * to bp which is part of skb->data would not be valid
167 * anymore hope that after skb_pull(ourskb, ..) our
168 * dsc_c and src_c will not become invalid
169 */
170 bp = ourskb->data;
171 dst_c = *(ax25_address *)(bp + 1);
172 src_c = *(ax25_address *)(bp + 8);
174 skb_pull(ourskb, AX25_HEADER_LEN - 1); /* Keep PID */
175 ourskb->nh.raw = ourskb->data;
177 ax25=ax25_send_frame(
178 ourskb,
179 ax25_dev->values[AX25_VALUES_PACLEN],
180 &src_c,
181 &dst_c, digipeat, dev);
182 if (ax25) {
183 ax25_cb_put(ax25);
184 }
185 goto put;
186 }
187 }
189 bp[7] &= ~AX25_CBIT;
190 bp[7] &= ~AX25_EBIT;
191 bp[7] |= AX25_SSSID_SPARE;
193 bp[14] &= ~AX25_CBIT;
194 bp[14] |= AX25_EBIT;
195 bp[14] |= AX25_SSSID_SPARE;
197 skb_pull(skb, AX25_KISS_HEADER_LEN);
199 if (digipeat != NULL) {
200 if ((ourskb = ax25_rt_build_path(skb, src, dst, route->digipeat)) == NULL) {
201 kfree_skb(skb);
202 goto put;
203 }
205 skb = ourskb;
206 }
208 ax25_queue_xmit(skb, dev);
210 put:
211 if (route)
212 ax25_put_route(route);
214 return 1;
215 }
217 #else /* INET */
219 int ax25_hard_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, void *daddr, void *saddr, unsigned len)
220 {
221 return -AX25_HEADER_LEN;
222 }
224 int ax25_rebuild_header(struct sk_buff *skb)
225 {
226 return 1;
227 }
229 #endif
231 EXPORT_SYMBOL(ax25_hard_header);
232 EXPORT_SYMBOL(ax25_rebuild_header);