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1 | /* |
2 | * File: pep-gprs.c |
3 | * |
4 | * GPRS over Phonet pipe end point socket |
5 | * |
6 | * Copyright (C) 2008 Nokia Corporation. |
7 | * |
8 | * Author: RĂ©mi Denis-Courmont <remi.denis-courmont@nokia.com> |
9 | * |
10 | * This program is free software; you can redistribute it and/or |
11 | * modify it under the terms of the GNU General Public License |
12 | * version 2 as published by the Free Software Foundation. |
13 | * |
14 | * This program is distributed in the hope that it will be useful, but |
15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
17 | * General Public License for more details. |
18 | * |
19 | * You should have received a copy of the GNU General Public License |
20 | * along with this program; if not, write to the Free Software |
21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
22 | * 02110-1301 USA |
23 | */ |
24 | |
25 | #include <linux/kernel.h> |
26 | #include <linux/netdevice.h> |
27 | #include <linux/if_ether.h> |
28 | #include <linux/if_arp.h> |
29 | #include <net/sock.h> |
30 | |
31 | #include <linux/if_phonet.h> |
32 | #include <net/tcp_states.h> |
33 | #include <net/phonet/gprs.h> |
34 | |
35 | #define GPRS_DEFAULT_MTU 1400 |
36 | |
37 | struct gprs_dev { |
38 | struct sock *sk; |
39 | void (*old_state_change)(struct sock *); |
40 | void (*old_data_ready)(struct sock *, int); |
41 | void (*old_write_space)(struct sock *); |
42 | |
43 | struct net_device *dev; |
44 | }; |
45 | |
46 | static __be16 gprs_type_trans(struct sk_buff *skb) |
47 | { |
48 | const u8 *pvfc; |
49 | u8 buf; |
50 | |
51 | pvfc = skb_header_pointer(skb, 0, 1, &buf); |
52 | if (!pvfc) |
53 | return htons(0); |
54 | /* Look at IP version field */ |
55 | switch (*pvfc >> 4) { |
56 | case 4: |
57 | return htons(ETH_P_IP); |
58 | case 6: |
59 | return htons(ETH_P_IPV6); |
60 | } |
61 | return htons(0); |
62 | } |
63 | |
64 | static void gprs_writeable(struct gprs_dev *gp) |
65 | { |
66 | struct net_device *dev = gp->dev; |
67 | |
68 | if (pep_writeable(gp->sk)) |
69 | netif_wake_queue(dev); |
70 | } |
71 | |
72 | /* |
73 | * Socket callbacks |
74 | */ |
75 | |
76 | static void gprs_state_change(struct sock *sk) |
77 | { |
78 | struct gprs_dev *gp = sk->sk_user_data; |
79 | |
80 | if (sk->sk_state == TCP_CLOSE_WAIT) { |
81 | struct net_device *dev = gp->dev; |
82 | |
83 | netif_stop_queue(dev); |
84 | netif_carrier_off(dev); |
85 | } |
86 | } |
87 | |
88 | static int gprs_recv(struct gprs_dev *gp, struct sk_buff *skb) |
89 | { |
90 | struct net_device *dev = gp->dev; |
91 | int err = 0; |
92 | __be16 protocol = gprs_type_trans(skb); |
93 | |
94 | if (!protocol) { |
95 | err = -EINVAL; |
96 | goto drop; |
97 | } |
98 | |
99 | if (skb_headroom(skb) & 3) { |
100 | struct sk_buff *rskb, *fs; |
101 | int flen = 0; |
102 | |
103 | /* Phonet Pipe data header may be misaligned (3 bytes), |
104 | * so wrap the IP packet as a single fragment of an head-less |
105 | * socket buffer. The network stack will pull what it needs, |
106 | * but at least, the whole IP payload is not memcpy'd. */ |
107 | rskb = netdev_alloc_skb(dev, 0); |
108 | if (!rskb) { |
109 | err = -ENOBUFS; |
110 | goto drop; |
111 | } |
112 | skb_shinfo(rskb)->frag_list = skb; |
113 | rskb->len += skb->len; |
114 | rskb->data_len += rskb->len; |
115 | rskb->truesize += rskb->len; |
116 | |
117 | /* Avoid nested fragments */ |
118 | skb_walk_frags(skb, fs) |
119 | flen += fs->len; |
120 | skb->next = skb_shinfo(skb)->frag_list; |
121 | skb_frag_list_init(skb); |
122 | skb->len -= flen; |
123 | skb->data_len -= flen; |
124 | skb->truesize -= flen; |
125 | |
126 | skb = rskb; |
127 | } |
128 | |
129 | skb->protocol = protocol; |
130 | skb_reset_mac_header(skb); |
131 | skb->dev = dev; |
132 | |
133 | if (likely(dev->flags & IFF_UP)) { |
134 | dev->stats.rx_packets++; |
135 | dev->stats.rx_bytes += skb->len; |
136 | netif_rx(skb); |
137 | skb = NULL; |
138 | } else |
139 | err = -ENODEV; |
140 | |
141 | drop: |
142 | if (skb) { |
143 | dev_kfree_skb(skb); |
144 | dev->stats.rx_dropped++; |
145 | } |
146 | return err; |
147 | } |
148 | |
149 | static void gprs_data_ready(struct sock *sk, int len) |
150 | { |
151 | struct gprs_dev *gp = sk->sk_user_data; |
152 | struct sk_buff *skb; |
153 | |
154 | while ((skb = pep_read(sk)) != NULL) { |
155 | skb_orphan(skb); |
156 | gprs_recv(gp, skb); |
157 | } |
158 | } |
159 | |
160 | static void gprs_write_space(struct sock *sk) |
161 | { |
162 | struct gprs_dev *gp = sk->sk_user_data; |
163 | |
164 | if (netif_running(gp->dev)) |
165 | gprs_writeable(gp); |
166 | } |
167 | |
168 | /* |
169 | * Network device callbacks |
170 | */ |
171 | |
172 | static int gprs_open(struct net_device *dev) |
173 | { |
174 | struct gprs_dev *gp = netdev_priv(dev); |
175 | |
176 | gprs_writeable(gp); |
177 | return 0; |
178 | } |
179 | |
180 | static int gprs_close(struct net_device *dev) |
181 | { |
182 | netif_stop_queue(dev); |
183 | return 0; |
184 | } |
185 | |
186 | static netdev_tx_t gprs_xmit(struct sk_buff *skb, struct net_device *dev) |
187 | { |
188 | struct gprs_dev *gp = netdev_priv(dev); |
189 | struct sock *sk = gp->sk; |
190 | int len, err; |
191 | |
192 | switch (skb->protocol) { |
193 | case htons(ETH_P_IP): |
194 | case htons(ETH_P_IPV6): |
195 | break; |
196 | default: |
197 | dev_kfree_skb(skb); |
198 | return NETDEV_TX_OK; |
199 | } |
200 | |
201 | skb_orphan(skb); |
202 | skb_set_owner_w(skb, sk); |
203 | len = skb->len; |
204 | err = pep_write(sk, skb); |
205 | if (err) { |
206 | LIMIT_NETDEBUG(KERN_WARNING"%s: TX error (%d)\n", |
207 | dev->name, err); |
208 | dev->stats.tx_aborted_errors++; |
209 | dev->stats.tx_errors++; |
210 | } else { |
211 | dev->stats.tx_packets++; |
212 | dev->stats.tx_bytes += len; |
213 | } |
214 | |
215 | netif_stop_queue(dev); |
216 | if (pep_writeable(sk)) |
217 | netif_wake_queue(dev); |
218 | return NETDEV_TX_OK; |
219 | } |
220 | |
221 | static int gprs_set_mtu(struct net_device *dev, int new_mtu) |
222 | { |
223 | if ((new_mtu < 576) || (new_mtu > (PHONET_MAX_MTU - 11))) |
224 | return -EINVAL; |
225 | |
226 | dev->mtu = new_mtu; |
227 | return 0; |
228 | } |
229 | |
230 | static const struct net_device_ops gprs_netdev_ops = { |
231 | .ndo_open = gprs_open, |
232 | .ndo_stop = gprs_close, |
233 | .ndo_start_xmit = gprs_xmit, |
234 | .ndo_change_mtu = gprs_set_mtu, |
235 | }; |
236 | |
237 | static void gprs_setup(struct net_device *dev) |
238 | { |
239 | dev->features = NETIF_F_FRAGLIST; |
240 | dev->type = ARPHRD_PHONET_PIPE; |
241 | dev->flags = IFF_POINTOPOINT | IFF_NOARP; |
242 | dev->mtu = GPRS_DEFAULT_MTU; |
243 | dev->hard_header_len = 0; |
244 | dev->addr_len = 0; |
245 | dev->tx_queue_len = 10; |
246 | |
247 | dev->netdev_ops = &gprs_netdev_ops; |
248 | dev->destructor = free_netdev; |
249 | } |
250 | |
251 | /* |
252 | * External interface |
253 | */ |
254 | |
255 | /* |
256 | * Attach a GPRS interface to a datagram socket. |
257 | * Returns the interface index on success, negative error code on error. |
258 | */ |
259 | int gprs_attach(struct sock *sk) |
260 | { |
261 | static const char ifname[] = "gprs%d"; |
262 | struct gprs_dev *gp; |
263 | struct net_device *dev; |
264 | int err; |
265 | |
266 | if (unlikely(sk->sk_type == SOCK_STREAM)) |
267 | return -EINVAL; /* need packet boundaries */ |
268 | |
269 | /* Create net device */ |
270 | dev = alloc_netdev(sizeof(*gp), ifname, gprs_setup); |
271 | if (!dev) |
272 | return -ENOMEM; |
273 | gp = netdev_priv(dev); |
274 | gp->sk = sk; |
275 | gp->dev = dev; |
276 | |
277 | netif_stop_queue(dev); |
278 | err = register_netdev(dev); |
279 | if (err) { |
280 | free_netdev(dev); |
281 | return err; |
282 | } |
283 | |
284 | lock_sock(sk); |
285 | if (unlikely(sk->sk_user_data)) { |
286 | err = -EBUSY; |
287 | goto out_rel; |
288 | } |
289 | if (unlikely((1 << sk->sk_state & (TCPF_CLOSE|TCPF_LISTEN)) || |
290 | sock_flag(sk, SOCK_DEAD))) { |
291 | err = -EINVAL; |
292 | goto out_rel; |
293 | } |
294 | sk->sk_user_data = gp; |
295 | gp->old_state_change = sk->sk_state_change; |
296 | gp->old_data_ready = sk->sk_data_ready; |
297 | gp->old_write_space = sk->sk_write_space; |
298 | sk->sk_state_change = gprs_state_change; |
299 | sk->sk_data_ready = gprs_data_ready; |
300 | sk->sk_write_space = gprs_write_space; |
301 | release_sock(sk); |
302 | sock_hold(sk); |
303 | |
304 | printk(KERN_DEBUG"%s: attached\n", dev->name); |
305 | return dev->ifindex; |
306 | |
307 | out_rel: |
308 | release_sock(sk); |
309 | unregister_netdev(dev); |
310 | return err; |
311 | } |
312 | |
313 | void gprs_detach(struct sock *sk) |
314 | { |
315 | struct gprs_dev *gp = sk->sk_user_data; |
316 | struct net_device *dev = gp->dev; |
317 | |
318 | lock_sock(sk); |
319 | sk->sk_user_data = NULL; |
320 | sk->sk_state_change = gp->old_state_change; |
321 | sk->sk_data_ready = gp->old_data_ready; |
322 | sk->sk_write_space = gp->old_write_space; |
323 | release_sock(sk); |
324 | |
325 | printk(KERN_DEBUG"%s: detached\n", dev->name); |
326 | unregister_netdev(dev); |
327 | sock_put(sk); |
328 | } |
329 |
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