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Linux/net/caif/chnl_net.c

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  1 /*
  2  * Copyright (C) ST-Ericsson AB 2010
  3  * Authors:     Sjur Brendeland/sjur.brandeland@stericsson.com
  4  *              Daniel Martensson / Daniel.Martensson@stericsson.com
  5  * License terms: GNU General Public License (GPL) version 2
  6  */
  7 
  8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
  9 
 10 #include <linux/version.h>
 11 #include <linux/fs.h>
 12 #include <linux/init.h>
 13 #include <linux/module.h>
 14 #include <linux/netdevice.h>
 15 #include <linux/if_ether.h>
 16 #include <linux/moduleparam.h>
 17 #include <linux/ip.h>
 18 #include <linux/sched.h>
 19 #include <linux/sockios.h>
 20 #include <linux/caif/if_caif.h>
 21 #include <net/rtnetlink.h>
 22 #include <net/caif/caif_layer.h>
 23 #include <net/caif/cfpkt.h>
 24 #include <net/caif/caif_dev.h>
 25 
 26 /* GPRS PDP connection has MTU to 1500 */
 27 #define GPRS_PDP_MTU 1500
 28 /* 5 sec. connect timeout */
 29 #define CONNECT_TIMEOUT (5 * HZ)
 30 #define CAIF_NET_DEFAULT_QUEUE_LEN 500
 31 
 32 /*This list is protected by the rtnl lock. */
 33 static LIST_HEAD(chnl_net_list);
 34 
 35 MODULE_LICENSE("GPL");
 36 MODULE_ALIAS_RTNL_LINK("caif");
 37 
 38 enum caif_states {
 39         CAIF_CONNECTED          = 1,
 40         CAIF_CONNECTING,
 41         CAIF_DISCONNECTED,
 42         CAIF_SHUTDOWN
 43 };
 44 
 45 struct chnl_net {
 46         struct cflayer chnl;
 47         struct net_device_stats stats;
 48         struct caif_connect_request conn_req;
 49         struct list_head list_field;
 50         struct net_device *netdev;
 51         char name[256];
 52         wait_queue_head_t netmgmt_wq;
 53         /* Flow status to remember and control the transmission. */
 54         bool flowenabled;
 55         enum caif_states state;
 56 };
 57 
 58 static void robust_list_del(struct list_head *delete_node)
 59 {
 60         struct list_head *list_node;
 61         struct list_head *n;
 62         ASSERT_RTNL();
 63         list_for_each_safe(list_node, n, &chnl_net_list) {
 64                 if (list_node == delete_node) {
 65                         list_del(list_node);
 66                         return;
 67                 }
 68         }
 69         WARN_ON(1);
 70 }
 71 
 72 static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
 73 {
 74         struct sk_buff *skb;
 75         struct chnl_net *priv  = container_of(layr, struct chnl_net, chnl);
 76         int pktlen;
 77         int err = 0;
 78         const u8 *ip_version;
 79         u8 buf;
 80 
 81         priv = container_of(layr, struct chnl_net, chnl);
 82 
 83         if (!priv)
 84                 return -EINVAL;
 85 
 86         skb = (struct sk_buff *) cfpkt_tonative(pkt);
 87 
 88         /* Get length of CAIF packet. */
 89         pktlen = skb->len;
 90 
 91         /* Pass some minimum information and
 92          * send the packet to the net stack.
 93          */
 94         skb->dev = priv->netdev;
 95 
 96         /* check the version of IP */
 97         ip_version = skb_header_pointer(skb, 0, 1, &buf);
 98         if (!ip_version)
 99                 return -EINVAL;
100         switch (*ip_version >> 4) {
101         case 4:
102                 skb->protocol = htons(ETH_P_IP);
103                 break;
104         case 6:
105                 skb->protocol = htons(ETH_P_IPV6);
106                 break;
107         default:
108                 return -EINVAL;
109         }
110 
111         /* If we change the header in loop mode, the checksum is corrupted. */
112         if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
113                 skb->ip_summed = CHECKSUM_UNNECESSARY;
114         else
115                 skb->ip_summed = CHECKSUM_NONE;
116 
117         if (in_interrupt())
118                 netif_rx(skb);
119         else
120                 netif_rx_ni(skb);
121 
122         /* Update statistics. */
123         priv->netdev->stats.rx_packets++;
124         priv->netdev->stats.rx_bytes += pktlen;
125 
126         return err;
127 }
128 
129 static int delete_device(struct chnl_net *dev)
130 {
131         ASSERT_RTNL();
132         if (dev->netdev)
133                 unregister_netdevice(dev->netdev);
134         return 0;
135 }
136 
137 static void close_work(struct work_struct *work)
138 {
139         struct chnl_net *dev = NULL;
140         struct list_head *list_node;
141         struct list_head *_tmp;
142 
143         rtnl_lock();
144         list_for_each_safe(list_node, _tmp, &chnl_net_list) {
145                 dev = list_entry(list_node, struct chnl_net, list_field);
146                 if (dev->state == CAIF_SHUTDOWN)
147                         dev_close(dev->netdev);
148         }
149         rtnl_unlock();
150 }
151 static DECLARE_WORK(close_worker, close_work);
152 
153 static void chnl_hold(struct cflayer *lyr)
154 {
155         struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
156         dev_hold(priv->netdev);
157 }
158 
159 static void chnl_put(struct cflayer *lyr)
160 {
161         struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
162         dev_put(priv->netdev);
163 }
164 
165 static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
166                                 int phyid)
167 {
168         struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
169         pr_debug("NET flowctrl func called flow: %s\n",
170                 flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
171                 flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
172                 flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
173                 flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
174                 flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
175                 flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
176                  "REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
177 
178 
179 
180         switch (flow) {
181         case CAIF_CTRLCMD_FLOW_OFF_IND:
182                 priv->flowenabled = false;
183                 netif_stop_queue(priv->netdev);
184                 break;
185         case CAIF_CTRLCMD_DEINIT_RSP:
186                 priv->state = CAIF_DISCONNECTED;
187                 break;
188         case CAIF_CTRLCMD_INIT_FAIL_RSP:
189                 priv->state = CAIF_DISCONNECTED;
190                 wake_up_interruptible(&priv->netmgmt_wq);
191                 break;
192         case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
193                 priv->state = CAIF_SHUTDOWN;
194                 netif_tx_disable(priv->netdev);
195                 schedule_work(&close_worker);
196                 break;
197         case CAIF_CTRLCMD_FLOW_ON_IND:
198                 priv->flowenabled = true;
199                 netif_wake_queue(priv->netdev);
200                 break;
201         case CAIF_CTRLCMD_INIT_RSP:
202                 caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
203                 priv->state = CAIF_CONNECTED;
204                 priv->flowenabled = true;
205                 netif_wake_queue(priv->netdev);
206                 wake_up_interruptible(&priv->netmgmt_wq);
207                 break;
208         default:
209                 break;
210         }
211 }
212 
213 static int chnl_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
214 {
215         struct chnl_net *priv;
216         struct cfpkt *pkt = NULL;
217         int len;
218         int result = -1;
219         /* Get our private data. */
220         priv = netdev_priv(dev);
221 
222         if (skb->len > priv->netdev->mtu) {
223                 pr_warn("Size of skb exceeded MTU\n");
224                 return -ENOSPC;
225         }
226 
227         if (!priv->flowenabled) {
228                 pr_debug("dropping packets flow off\n");
229                 return NETDEV_TX_BUSY;
230         }
231 
232         if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
233                 swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
234 
235         /* Store original SKB length. */
236         len = skb->len;
237 
238         pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
239 
240         /* Send the packet down the stack. */
241         result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
242         if (result) {
243                 if (result == -EAGAIN)
244                         result = NETDEV_TX_BUSY;
245                 return result;
246         }
247 
248         /* Update statistics. */
249         dev->stats.tx_packets++;
250         dev->stats.tx_bytes += len;
251 
252         return NETDEV_TX_OK;
253 }
254 
255 static int chnl_net_open(struct net_device *dev)
256 {
257         struct chnl_net *priv = NULL;
258         int result = -1;
259         int llifindex, headroom, tailroom, mtu;
260         struct net_device *lldev;
261         ASSERT_RTNL();
262         priv = netdev_priv(dev);
263         if (!priv) {
264                 pr_debug("chnl_net_open: no priv\n");
265                 return -ENODEV;
266         }
267 
268         if (priv->state != CAIF_CONNECTING) {
269                 priv->state = CAIF_CONNECTING;
270                 result = caif_connect_client(dev_net(dev), &priv->conn_req,
271                                                 &priv->chnl, &llifindex,
272                                                 &headroom, &tailroom);
273                 if (result != 0) {
274                                 pr_debug("err: "
275                                          "Unable to register and open device,"
276                                          " Err:%d\n",
277                                          result);
278                                 goto error;
279                 }
280 
281                 lldev = dev_get_by_index(dev_net(dev), llifindex);
282 
283                 if (lldev == NULL) {
284                         pr_debug("no interface?\n");
285                         result = -ENODEV;
286                         goto error;
287                 }
288 
289                 dev->needed_tailroom = tailroom + lldev->needed_tailroom;
290                 dev->hard_header_len = headroom + lldev->hard_header_len +
291                         lldev->needed_tailroom;
292 
293                 /*
294                  * MTU, head-room etc is not know before we have a
295                  * CAIF link layer device available. MTU calculation may
296                  * override initial RTNL configuration.
297                  * MTU is minimum of current mtu, link layer mtu pluss
298                  * CAIF head and tail, and PDP GPRS contexts max MTU.
299                  */
300                 mtu = min_t(int, dev->mtu, lldev->mtu - (headroom + tailroom));
301                 mtu = min_t(int, GPRS_PDP_MTU, mtu);
302                 dev_set_mtu(dev, mtu);
303                 dev_put(lldev);
304 
305                 if (mtu < 100) {
306                         pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
307                         result = -ENODEV;
308                         goto error;
309                 }
310         }
311 
312         rtnl_unlock();  /* Release RTNL lock during connect wait */
313 
314         result = wait_event_interruptible_timeout(priv->netmgmt_wq,
315                                                 priv->state != CAIF_CONNECTING,
316                                                 CONNECT_TIMEOUT);
317 
318         rtnl_lock();
319 
320         if (result == -ERESTARTSYS) {
321                 pr_debug("wait_event_interruptible woken by a signal\n");
322                 result = -ERESTARTSYS;
323                 goto error;
324         }
325 
326         if (result == 0) {
327                 pr_debug("connect timeout\n");
328                 caif_disconnect_client(dev_net(dev), &priv->chnl);
329                 priv->state = CAIF_DISCONNECTED;
330                 pr_debug("state disconnected\n");
331                 result = -ETIMEDOUT;
332                 goto error;
333         }
334 
335         if (priv->state != CAIF_CONNECTED) {
336                 pr_debug("connect failed\n");
337                 result = -ECONNREFUSED;
338                 goto error;
339         }
340         pr_debug("CAIF Netdevice connected\n");
341         return 0;
342 
343 error:
344         caif_disconnect_client(dev_net(dev), &priv->chnl);
345         priv->state = CAIF_DISCONNECTED;
346         pr_debug("state disconnected\n");
347         return result;
348 
349 }
350 
351 static int chnl_net_stop(struct net_device *dev)
352 {
353         struct chnl_net *priv;
354 
355         ASSERT_RTNL();
356         priv = netdev_priv(dev);
357         priv->state = CAIF_DISCONNECTED;
358         caif_disconnect_client(dev_net(dev), &priv->chnl);
359         return 0;
360 }
361 
362 static int chnl_net_init(struct net_device *dev)
363 {
364         struct chnl_net *priv;
365         ASSERT_RTNL();
366         priv = netdev_priv(dev);
367         strncpy(priv->name, dev->name, sizeof(priv->name));
368         return 0;
369 }
370 
371 static void chnl_net_uninit(struct net_device *dev)
372 {
373         struct chnl_net *priv;
374         ASSERT_RTNL();
375         priv = netdev_priv(dev);
376         robust_list_del(&priv->list_field);
377 }
378 
379 static const struct net_device_ops netdev_ops = {
380         .ndo_open = chnl_net_open,
381         .ndo_stop = chnl_net_stop,
382         .ndo_init = chnl_net_init,
383         .ndo_uninit = chnl_net_uninit,
384         .ndo_start_xmit = chnl_net_start_xmit,
385 };
386 
387 static void chnl_net_destructor(struct net_device *dev)
388 {
389         struct chnl_net *priv = netdev_priv(dev);
390         caif_free_client(&priv->chnl);
391         free_netdev(dev);
392 }
393 
394 static void ipcaif_net_setup(struct net_device *dev)
395 {
396         struct chnl_net *priv;
397         dev->netdev_ops = &netdev_ops;
398         dev->destructor = chnl_net_destructor;
399         dev->flags |= IFF_NOARP;
400         dev->flags |= IFF_POINTOPOINT;
401         dev->mtu = GPRS_PDP_MTU;
402         dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN;
403 
404         priv = netdev_priv(dev);
405         priv->chnl.receive = chnl_recv_cb;
406         priv->chnl.ctrlcmd = chnl_flowctrl_cb;
407         priv->netdev = dev;
408         priv->conn_req.protocol = CAIFPROTO_DATAGRAM;
409         priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW;
410         priv->conn_req.priority = CAIF_PRIO_LOW;
411         /* Insert illegal value */
412         priv->conn_req.sockaddr.u.dgm.connection_id = 0;
413         priv->flowenabled = false;
414 
415         init_waitqueue_head(&priv->netmgmt_wq);
416 }
417 
418 
419 static int ipcaif_fill_info(struct sk_buff *skb, const struct net_device *dev)
420 {
421         struct chnl_net *priv;
422         u8 loop;
423         priv = netdev_priv(dev);
424         NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID,
425                     priv->conn_req.sockaddr.u.dgm.connection_id);
426         NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID,
427                     priv->conn_req.sockaddr.u.dgm.connection_id);
428         loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP;
429         NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop);
430 
431 
432         return 0;
433 nla_put_failure:
434         return -EMSGSIZE;
435 
436 }
437 
438 static void caif_netlink_parms(struct nlattr *data[],
439                                 struct caif_connect_request *conn_req)
440 {
441         if (!data) {
442                 pr_warn("no params data found\n");
443                 return;
444         }
445         if (data[IFLA_CAIF_IPV4_CONNID])
446                 conn_req->sockaddr.u.dgm.connection_id =
447                         nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]);
448         if (data[IFLA_CAIF_IPV6_CONNID])
449                 conn_req->sockaddr.u.dgm.connection_id =
450                         nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]);
451         if (data[IFLA_CAIF_LOOPBACK]) {
452                 if (nla_get_u8(data[IFLA_CAIF_LOOPBACK]))
453                         conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP;
454                 else
455                         conn_req->protocol = CAIFPROTO_DATAGRAM;
456         }
457 }
458 
459 static int ipcaif_newlink(struct net *src_net, struct net_device *dev,
460                           struct nlattr *tb[], struct nlattr *data[])
461 {
462         int ret;
463         struct chnl_net *caifdev;
464         ASSERT_RTNL();
465         caifdev = netdev_priv(dev);
466         caif_netlink_parms(data, &caifdev->conn_req);
467         dev_net_set(caifdev->netdev, src_net);
468 
469         ret = register_netdevice(dev);
470         if (ret)
471                 pr_warn("device rtml registration failed\n");
472         else
473                 list_add(&caifdev->list_field, &chnl_net_list);
474 
475         /* Take ifindex as connection-id if null */
476         if (caifdev->conn_req.sockaddr.u.dgm.connection_id == 0)
477                 caifdev->conn_req.sockaddr.u.dgm.connection_id = dev->ifindex;
478         return ret;
479 }
480 
481 static int ipcaif_changelink(struct net_device *dev, struct nlattr *tb[],
482                                 struct nlattr *data[])
483 {
484         struct chnl_net *caifdev;
485         ASSERT_RTNL();
486         caifdev = netdev_priv(dev);
487         caif_netlink_parms(data, &caifdev->conn_req);
488         netdev_state_change(dev);
489         return 0;
490 }
491 
492 static size_t ipcaif_get_size(const struct net_device *dev)
493 {
494         return
495                 /* IFLA_CAIF_IPV4_CONNID */
496                 nla_total_size(4) +
497                 /* IFLA_CAIF_IPV6_CONNID */
498                 nla_total_size(4) +
499                 /* IFLA_CAIF_LOOPBACK */
500                 nla_total_size(2) +
501                 0;
502 }
503 
504 static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = {
505         [IFLA_CAIF_IPV4_CONNID]       = { .type = NLA_U32 },
506         [IFLA_CAIF_IPV6_CONNID]       = { .type = NLA_U32 },
507         [IFLA_CAIF_LOOPBACK]          = { .type = NLA_U8 }
508 };
509 
510 
511 static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
512         .kind           = "caif",
513         .priv_size      = sizeof(struct chnl_net),
514         .setup          = ipcaif_net_setup,
515         .maxtype        = IFLA_CAIF_MAX,
516         .policy         = ipcaif_policy,
517         .newlink        = ipcaif_newlink,
518         .changelink     = ipcaif_changelink,
519         .get_size       = ipcaif_get_size,
520         .fill_info      = ipcaif_fill_info,
521 
522 };
523 
524 static int __init chnl_init_module(void)
525 {
526         return rtnl_link_register(&ipcaif_link_ops);
527 }
528 
529 static void __exit chnl_exit_module(void)
530 {
531         struct chnl_net *dev = NULL;
532         struct list_head *list_node;
533         struct list_head *_tmp;
534         rtnl_link_unregister(&ipcaif_link_ops);
535         rtnl_lock();
536         list_for_each_safe(list_node, _tmp, &chnl_net_list) {
537                 dev = list_entry(list_node, struct chnl_net, list_field);
538                 list_del(list_node);
539                 delete_device(dev);
540         }
541         rtnl_unlock();
542 }
543 
544 module_init(chnl_init_module);
545 module_exit(chnl_exit_module);
546 

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