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
8 #define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__
11 #include <linux/hardirq.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>
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>
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
32 /*This list is protected by the rtnl lock. */
33 static LIST_HEAD(chnl_net_list);
35 MODULE_LICENSE("GPL");
36 MODULE_ALIAS_RTNL_LINK("caif");
47 struct net_device_stats stats;
48 struct caif_connect_request conn_req;
49 struct list_head list_field;
50 struct net_device *netdev;
52 wait_queue_head_t netmgmt_wq;
53 /* Flow status to remember and control the transmission. */
55 enum caif_states state;
58 static void robust_list_del(struct list_head *delete_node)
60 struct list_head *list_node;
63 list_for_each_safe(list_node, n, &chnl_net_list) {
64 if (list_node == delete_node) {
72 static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt)
75 struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
80 priv = container_of(layr, struct chnl_net, chnl);
85 skb = (struct sk_buff *) cfpkt_tonative(pkt);
87 /* Get length of CAIF packet. */
90 /* Pass some minimum information and
91 * send the packet to the net stack.
93 skb->dev = priv->netdev;
95 /* check the version of IP */
96 ip_version = skb_header_pointer(skb, 0, 1, &buf);
98 switch (*ip_version >> 4) {
100 skb->protocol = htons(ETH_P_IP);
103 skb->protocol = htons(ETH_P_IPV6);
106 priv->netdev->stats.rx_errors++;
110 /* If we change the header in loop mode, the checksum is corrupted. */
111 if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
112 skb->ip_summed = CHECKSUM_UNNECESSARY;
114 skb->ip_summed = CHECKSUM_NONE;
121 /* Update statistics. */
122 priv->netdev->stats.rx_packets++;
123 priv->netdev->stats.rx_bytes += pktlen;
128 static int delete_device(struct chnl_net *dev)
132 unregister_netdevice(dev->netdev);
136 static void close_work(struct work_struct *work)
138 struct chnl_net *dev = NULL;
139 struct list_head *list_node;
140 struct list_head *_tmp;
143 list_for_each_safe(list_node, _tmp, &chnl_net_list) {
144 dev = list_entry(list_node, struct chnl_net, list_field);
145 if (dev->state == CAIF_SHUTDOWN)
146 dev_close(dev->netdev);
150 static DECLARE_WORK(close_worker, close_work);
152 static void chnl_hold(struct cflayer *lyr)
154 struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
155 dev_hold(priv->netdev);
158 static void chnl_put(struct cflayer *lyr)
160 struct chnl_net *priv = container_of(lyr, struct chnl_net, chnl);
161 dev_put(priv->netdev);
164 static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow,
167 struct chnl_net *priv = container_of(layr, struct chnl_net, chnl);
168 pr_debug("NET flowctrl func called flow: %s\n",
169 flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" :
170 flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" :
171 flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" :
172 flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" :
173 flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" :
174 flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ?
175 "REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND");
180 case CAIF_CTRLCMD_FLOW_OFF_IND:
181 priv->flowenabled = false;
182 netif_stop_queue(priv->netdev);
184 case CAIF_CTRLCMD_DEINIT_RSP:
185 priv->state = CAIF_DISCONNECTED;
187 case CAIF_CTRLCMD_INIT_FAIL_RSP:
188 priv->state = CAIF_DISCONNECTED;
189 wake_up_interruptible(&priv->netmgmt_wq);
191 case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
192 priv->state = CAIF_SHUTDOWN;
193 netif_tx_disable(priv->netdev);
194 schedule_work(&close_worker);
196 case CAIF_CTRLCMD_FLOW_ON_IND:
197 priv->flowenabled = true;
198 netif_wake_queue(priv->netdev);
200 case CAIF_CTRLCMD_INIT_RSP:
201 caif_client_register_refcnt(&priv->chnl, chnl_hold, chnl_put);
202 priv->state = CAIF_CONNECTED;
203 priv->flowenabled = true;
204 netif_wake_queue(priv->netdev);
205 wake_up_interruptible(&priv->netmgmt_wq);
212 static int chnl_net_start_xmit(struct sk_buff *skb, struct net_device *dev)
214 struct chnl_net *priv;
215 struct cfpkt *pkt = NULL;
218 /* Get our private data. */
219 priv = netdev_priv(dev);
221 if (skb->len > priv->netdev->mtu) {
222 pr_warn("Size of skb exceeded MTU\n");
223 dev->stats.tx_errors++;
227 if (!priv->flowenabled) {
228 pr_debug("dropping packets flow off\n");
229 dev->stats.tx_dropped++;
230 return NETDEV_TX_BUSY;
233 if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP)
234 swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr);
236 /* Store original SKB length. */
239 pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb);
241 /* Send the packet down the stack. */
242 result = priv->chnl.dn->transmit(priv->chnl.dn, pkt);
244 dev->stats.tx_dropped++;
248 /* Update statistics. */
249 dev->stats.tx_packets++;
250 dev->stats.tx_bytes += len;
255 static int chnl_net_open(struct net_device *dev)
257 struct chnl_net *priv = NULL;
259 int llifindex, headroom, tailroom, mtu;
260 struct net_device *lldev;
262 priv = netdev_priv(dev);
264 pr_debug("chnl_net_open: no priv\n");
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);
275 "Unable to register and open device,"
281 lldev = dev_get_by_index(dev_net(dev), llifindex);
284 pr_debug("no interface?\n");
289 dev->needed_tailroom = tailroom + lldev->needed_tailroom;
290 dev->hard_header_len = headroom + lldev->hard_header_len +
291 lldev->needed_tailroom;
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.
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);
306 pr_warn("CAIF Interface MTU too small (%d)\n", mtu);
312 rtnl_unlock(); /* Release RTNL lock during connect wait */
314 result = wait_event_interruptible_timeout(priv->netmgmt_wq,
315 priv->state != CAIF_CONNECTING,
320 if (result == -ERESTARTSYS) {
321 pr_debug("wait_event_interruptible woken by a signal\n");
322 result = -ERESTARTSYS;
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");
335 if (priv->state != CAIF_CONNECTED) {
336 pr_debug("connect failed\n");
337 result = -ECONNREFUSED;
340 pr_debug("CAIF Netdevice connected\n");
344 caif_disconnect_client(dev_net(dev), &priv->chnl);
345 priv->state = CAIF_DISCONNECTED;
346 pr_debug("state disconnected\n");
351 static int chnl_net_stop(struct net_device *dev)
353 struct chnl_net *priv;
356 priv = netdev_priv(dev);
357 priv->state = CAIF_DISCONNECTED;
358 caif_disconnect_client(dev_net(dev), &priv->chnl);
362 static int chnl_net_init(struct net_device *dev)
364 struct chnl_net *priv;
366 priv = netdev_priv(dev);
367 strncpy(priv->name, dev->name, sizeof(priv->name));
371 static void chnl_net_uninit(struct net_device *dev)
373 struct chnl_net *priv;
375 priv = netdev_priv(dev);
376 robust_list_del(&priv->list_field);
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,
387 static void chnl_net_destructor(struct net_device *dev)
389 struct chnl_net *priv = netdev_priv(dev);
390 caif_free_client(&priv->chnl);
394 static void ipcaif_net_setup(struct net_device *dev)
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;
404 priv = netdev_priv(dev);
405 priv->chnl.receive = chnl_recv_cb;
406 priv->chnl.ctrlcmd = chnl_flowctrl_cb;
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;
415 init_waitqueue_head(&priv->netmgmt_wq);
419 static int ipcaif_fill_info(struct sk_buff *skb, const struct net_device *dev)
421 struct chnl_net *priv;
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);
438 static void caif_netlink_parms(struct nlattr *data[],
439 struct caif_connect_request *conn_req)
442 pr_warn("no params data found\n");
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;
455 conn_req->protocol = CAIFPROTO_DATAGRAM;
459 static int ipcaif_newlink(struct net *src_net, struct net_device *dev,
460 struct nlattr *tb[], struct nlattr *data[])
463 struct chnl_net *caifdev;
465 caifdev = netdev_priv(dev);
466 caif_netlink_parms(data, &caifdev->conn_req);
467 dev_net_set(caifdev->netdev, src_net);
469 ret = register_netdevice(dev);
471 pr_warn("device rtml registration failed\n");
473 list_add(&caifdev->list_field, &chnl_net_list);
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;
481 static int ipcaif_changelink(struct net_device *dev, struct nlattr *tb[],
482 struct nlattr *data[])
484 struct chnl_net *caifdev;
486 caifdev = netdev_priv(dev);
487 caif_netlink_parms(data, &caifdev->conn_req);
488 netdev_state_change(dev);
492 static size_t ipcaif_get_size(const struct net_device *dev)
495 /* IFLA_CAIF_IPV4_CONNID */
497 /* IFLA_CAIF_IPV6_CONNID */
499 /* IFLA_CAIF_LOOPBACK */
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 }
511 static struct rtnl_link_ops ipcaif_link_ops __read_mostly = {
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,
524 static int __init chnl_init_module(void)
526 return rtnl_link_register(&ipcaif_link_ops);
529 static void __exit chnl_exit_module(void)
531 struct chnl_net *dev = NULL;
532 struct list_head *list_node;
533 struct list_head *_tmp;
534 rtnl_link_unregister(&ipcaif_link_ops);
536 list_for_each_safe(list_node, _tmp, &chnl_net_list) {
537 dev = list_entry(list_node, struct chnl_net, list_field);
544 module_init(chnl_init_module);
545 module_exit(chnl_exit_module);