Sjur Braendeland | cc36a07 | 2010-03-30 13:56:27 +0000 | [diff] [blame^] | 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 | #include <linux/version.h> |
| 9 | #include <linux/fs.h> |
| 10 | #include <linux/init.h> |
| 11 | #include <linux/module.h> |
| 12 | #include <linux/netdevice.h> |
| 13 | #include <linux/if_ether.h> |
| 14 | #include <linux/moduleparam.h> |
| 15 | #include <linux/ip.h> |
| 16 | #include <linux/sched.h> |
| 17 | #include <linux/sockios.h> |
| 18 | #include <linux/caif/if_caif.h> |
| 19 | #include <net/rtnetlink.h> |
| 20 | #include <net/caif/caif_layer.h> |
| 21 | #include <net/caif/cfcnfg.h> |
| 22 | #include <net/caif/cfpkt.h> |
| 23 | #include <net/caif/caif_dev.h> |
| 24 | |
| 25 | #define CAIF_CONNECT_TIMEOUT 30 |
| 26 | #define SIZE_MTU 1500 |
| 27 | #define SIZE_MTU_MAX 4080 |
| 28 | #define SIZE_MTU_MIN 68 |
| 29 | #define CAIF_NET_DEFAULT_QUEUE_LEN 500 |
| 30 | |
| 31 | #undef pr_debug |
| 32 | #define pr_debug pr_warning |
| 33 | |
| 34 | /*This list is protected by the rtnl lock. */ |
| 35 | static LIST_HEAD(chnl_net_list); |
| 36 | |
| 37 | MODULE_LICENSE("GPL"); |
| 38 | MODULE_ALIAS_RTNL_LINK("caif"); |
| 39 | |
| 40 | struct chnl_net { |
| 41 | struct cflayer chnl; |
| 42 | struct net_device_stats stats; |
| 43 | struct caif_connect_request conn_req; |
| 44 | struct list_head list_field; |
| 45 | struct net_device *netdev; |
| 46 | char name[256]; |
| 47 | wait_queue_head_t netmgmt_wq; |
| 48 | /* Flow status to remember and control the transmission. */ |
| 49 | bool flowenabled; |
| 50 | bool pending_close; |
| 51 | }; |
| 52 | |
| 53 | static void robust_list_del(struct list_head *delete_node) |
| 54 | { |
| 55 | struct list_head *list_node; |
| 56 | struct list_head *n; |
| 57 | ASSERT_RTNL(); |
| 58 | list_for_each_safe(list_node, n, &chnl_net_list) { |
| 59 | if (list_node == delete_node) { |
| 60 | list_del(list_node); |
| 61 | break; |
| 62 | } |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | static int chnl_recv_cb(struct cflayer *layr, struct cfpkt *pkt) |
| 67 | { |
| 68 | struct sk_buff *skb; |
| 69 | struct chnl_net *priv = NULL; |
| 70 | int pktlen; |
| 71 | int err = 0; |
| 72 | |
| 73 | priv = container_of(layr, struct chnl_net, chnl); |
| 74 | |
| 75 | if (!priv) |
| 76 | return -EINVAL; |
| 77 | |
| 78 | /* Get length of CAIF packet. */ |
| 79 | pktlen = cfpkt_getlen(pkt); |
| 80 | |
| 81 | skb = (struct sk_buff *) cfpkt_tonative(pkt); |
| 82 | /* Pass some minimum information and |
| 83 | * send the packet to the net stack. |
| 84 | */ |
| 85 | skb->dev = priv->netdev; |
| 86 | skb->protocol = htons(ETH_P_IP); |
| 87 | |
| 88 | /* If we change the header in loop mode, the checksum is corrupted. */ |
| 89 | if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP) |
| 90 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 91 | else |
| 92 | skb->ip_summed = CHECKSUM_NONE; |
| 93 | |
| 94 | /* FIXME: Drivers should call this in tasklet context. */ |
| 95 | if (in_interrupt()) |
| 96 | netif_rx(skb); |
| 97 | else |
| 98 | netif_rx_ni(skb); |
| 99 | |
| 100 | /* Update statistics. */ |
| 101 | priv->netdev->stats.rx_packets++; |
| 102 | priv->netdev->stats.rx_bytes += pktlen; |
| 103 | |
| 104 | return err; |
| 105 | } |
| 106 | |
| 107 | static int delete_device(struct chnl_net *dev) |
| 108 | { |
| 109 | ASSERT_RTNL(); |
| 110 | if (dev->netdev) |
| 111 | unregister_netdevice(dev->netdev); |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static void close_work(struct work_struct *work) |
| 116 | { |
| 117 | struct chnl_net *dev = NULL; |
| 118 | struct list_head *list_node; |
| 119 | struct list_head *_tmp; |
| 120 | rtnl_lock(); |
| 121 | list_for_each_safe(list_node, _tmp, &chnl_net_list) { |
| 122 | dev = list_entry(list_node, struct chnl_net, list_field); |
| 123 | if (!dev->pending_close) |
| 124 | continue; |
| 125 | list_del(list_node); |
| 126 | delete_device(dev); |
| 127 | } |
| 128 | rtnl_unlock(); |
| 129 | } |
| 130 | static DECLARE_WORK(close_worker, close_work); |
| 131 | |
| 132 | static void chnl_flowctrl_cb(struct cflayer *layr, enum caif_ctrlcmd flow, |
| 133 | int phyid) |
| 134 | { |
| 135 | struct chnl_net *priv; |
| 136 | pr_debug("CAIF: %s(): NET flowctrl func called flow: %s.\n", |
| 137 | __func__, |
| 138 | flow == CAIF_CTRLCMD_FLOW_ON_IND ? "ON" : |
| 139 | flow == CAIF_CTRLCMD_INIT_RSP ? "INIT" : |
| 140 | flow == CAIF_CTRLCMD_FLOW_OFF_IND ? "OFF" : |
| 141 | flow == CAIF_CTRLCMD_DEINIT_RSP ? "CLOSE/DEINIT" : |
| 142 | flow == CAIF_CTRLCMD_INIT_FAIL_RSP ? "OPEN_FAIL" : |
| 143 | flow == CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND ? |
| 144 | "REMOTE_SHUTDOWN" : "UKNOWN CTRL COMMAND"); |
| 145 | |
| 146 | priv = container_of(layr, struct chnl_net, chnl); |
| 147 | |
| 148 | switch (flow) { |
| 149 | case CAIF_CTRLCMD_FLOW_OFF_IND: |
| 150 | case CAIF_CTRLCMD_DEINIT_RSP: |
| 151 | case CAIF_CTRLCMD_INIT_FAIL_RSP: |
| 152 | case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND: |
| 153 | priv->flowenabled = false; |
| 154 | netif_tx_disable(priv->netdev); |
| 155 | pr_warning("CAIF: %s(): done\n", __func__); |
| 156 | priv->pending_close = 1; |
| 157 | schedule_work(&close_worker); |
| 158 | break; |
| 159 | case CAIF_CTRLCMD_FLOW_ON_IND: |
| 160 | case CAIF_CTRLCMD_INIT_RSP: |
| 161 | priv->flowenabled = true; |
| 162 | netif_wake_queue(priv->netdev); |
| 163 | wake_up_interruptible(&priv->netmgmt_wq); |
| 164 | break; |
| 165 | default: |
| 166 | break; |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | static int chnl_net_start_xmit(struct sk_buff *skb, struct net_device *dev) |
| 171 | { |
| 172 | struct chnl_net *priv; |
| 173 | struct cfpkt *pkt = NULL; |
| 174 | int len; |
| 175 | int result = -1; |
| 176 | /* Get our private data. */ |
| 177 | priv = netdev_priv(dev); |
| 178 | |
| 179 | if (skb->len > priv->netdev->mtu) { |
| 180 | pr_warning("CAIF: %s(): Size of skb exceeded MTU\n", __func__); |
| 181 | return -ENOSPC; |
| 182 | } |
| 183 | |
| 184 | if (!priv->flowenabled) { |
| 185 | pr_debug("CAIF: %s(): dropping packets flow off\n", __func__); |
| 186 | return NETDEV_TX_BUSY; |
| 187 | } |
| 188 | |
| 189 | if (priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP) |
| 190 | swap(ip_hdr(skb)->saddr, ip_hdr(skb)->daddr); |
| 191 | |
| 192 | /* Store original SKB length. */ |
| 193 | len = skb->len; |
| 194 | |
| 195 | pkt = cfpkt_fromnative(CAIF_DIR_OUT, (void *) skb); |
| 196 | |
| 197 | pr_debug("CAIF: %s(): transmit inst %s %d,%p\n", |
| 198 | __func__, dev->name, priv->chnl.dn->id, &priv->chnl.dn); |
| 199 | |
| 200 | /* Send the packet down the stack. */ |
| 201 | result = priv->chnl.dn->transmit(priv->chnl.dn, pkt); |
| 202 | if (result) { |
| 203 | if (result == -EAGAIN) |
| 204 | result = NETDEV_TX_BUSY; |
| 205 | return result; |
| 206 | } |
| 207 | |
| 208 | /* Update statistics. */ |
| 209 | dev->stats.tx_packets++; |
| 210 | dev->stats.tx_bytes += len; |
| 211 | |
| 212 | return NETDEV_TX_OK; |
| 213 | } |
| 214 | |
| 215 | static int chnl_net_open(struct net_device *dev) |
| 216 | { |
| 217 | struct chnl_net *priv = NULL; |
| 218 | int result = -1; |
| 219 | ASSERT_RTNL(); |
| 220 | |
| 221 | priv = netdev_priv(dev); |
| 222 | pr_debug("CAIF: %s(): dev name: %s\n", __func__, priv->name); |
| 223 | |
| 224 | if (!priv) { |
| 225 | pr_debug("CAIF: %s(): chnl_net_open: no priv\n", __func__); |
| 226 | return -ENODEV; |
| 227 | } |
| 228 | result = caif_connect_client(&priv->conn_req, &priv->chnl); |
| 229 | if (result != 0) { |
| 230 | pr_debug("CAIF: %s(): err: " |
| 231 | "Unable to register and open device, Err:%d\n", |
| 232 | __func__, |
| 233 | result); |
| 234 | return -ENODEV; |
| 235 | } |
| 236 | result = wait_event_interruptible(priv->netmgmt_wq, priv->flowenabled); |
| 237 | |
| 238 | if (result == -ERESTARTSYS) { |
| 239 | pr_debug("CAIF: %s(): wait_event_interruptible" |
| 240 | " woken by a signal\n", __func__); |
| 241 | return -ERESTARTSYS; |
| 242 | } else |
| 243 | pr_debug("CAIF: %s(): Flow on recieved\n", __func__); |
| 244 | |
| 245 | return 0; |
| 246 | } |
| 247 | |
| 248 | static int chnl_net_stop(struct net_device *dev) |
| 249 | { |
| 250 | struct chnl_net *priv; |
| 251 | int result = -1; |
| 252 | ASSERT_RTNL(); |
| 253 | priv = netdev_priv(dev); |
| 254 | |
| 255 | result = caif_disconnect_client(&priv->chnl); |
| 256 | if (result != 0) { |
| 257 | pr_debug("CAIF: %s(): chnl_net_stop: err: " |
| 258 | "Unable to STOP device, Err:%d\n", |
| 259 | __func__, result); |
| 260 | return -EBUSY; |
| 261 | } |
| 262 | result = wait_event_interruptible(priv->netmgmt_wq, |
| 263 | !priv->flowenabled); |
| 264 | |
| 265 | if (result == -ERESTARTSYS) { |
| 266 | pr_debug("CAIF: %s(): wait_event_interruptible woken by" |
| 267 | " signal, signal_pending(current) = %d\n", |
| 268 | __func__, |
| 269 | signal_pending(current)); |
| 270 | } else { |
| 271 | pr_debug("CAIF: %s(): disconnect received\n", __func__); |
| 272 | |
| 273 | } |
| 274 | |
| 275 | return 0; |
| 276 | } |
| 277 | |
| 278 | static int chnl_net_init(struct net_device *dev) |
| 279 | { |
| 280 | struct chnl_net *priv; |
| 281 | ASSERT_RTNL(); |
| 282 | priv = netdev_priv(dev); |
| 283 | strncpy(priv->name, dev->name, sizeof(priv->name)); |
| 284 | return 0; |
| 285 | } |
| 286 | |
| 287 | static void chnl_net_uninit(struct net_device *dev) |
| 288 | { |
| 289 | struct chnl_net *priv; |
| 290 | ASSERT_RTNL(); |
| 291 | priv = netdev_priv(dev); |
| 292 | robust_list_del(&priv->list_field); |
| 293 | } |
| 294 | |
| 295 | static const struct net_device_ops netdev_ops = { |
| 296 | .ndo_open = chnl_net_open, |
| 297 | .ndo_stop = chnl_net_stop, |
| 298 | .ndo_init = chnl_net_init, |
| 299 | .ndo_uninit = chnl_net_uninit, |
| 300 | .ndo_start_xmit = chnl_net_start_xmit, |
| 301 | }; |
| 302 | |
| 303 | static void ipcaif_net_setup(struct net_device *dev) |
| 304 | { |
| 305 | struct chnl_net *priv; |
| 306 | dev->netdev_ops = &netdev_ops; |
| 307 | dev->destructor = free_netdev; |
| 308 | dev->flags |= IFF_NOARP; |
| 309 | dev->flags |= IFF_POINTOPOINT; |
| 310 | dev->needed_headroom = CAIF_NEEDED_HEADROOM; |
| 311 | dev->needed_tailroom = CAIF_NEEDED_TAILROOM; |
| 312 | dev->mtu = SIZE_MTU; |
| 313 | dev->tx_queue_len = CAIF_NET_DEFAULT_QUEUE_LEN; |
| 314 | |
| 315 | priv = netdev_priv(dev); |
| 316 | priv->chnl.receive = chnl_recv_cb; |
| 317 | priv->chnl.ctrlcmd = chnl_flowctrl_cb; |
| 318 | priv->netdev = dev; |
| 319 | priv->conn_req.protocol = CAIFPROTO_DATAGRAM; |
| 320 | priv->conn_req.link_selector = CAIF_LINK_HIGH_BANDW; |
| 321 | priv->conn_req.priority = CAIF_PRIO_LOW; |
| 322 | /* Insert illegal value */ |
| 323 | priv->conn_req.sockaddr.u.dgm.connection_id = -1; |
| 324 | priv->flowenabled = false; |
| 325 | |
| 326 | ASSERT_RTNL(); |
| 327 | init_waitqueue_head(&priv->netmgmt_wq); |
| 328 | list_add(&priv->list_field, &chnl_net_list); |
| 329 | } |
| 330 | |
| 331 | |
| 332 | static int ipcaif_fill_info(struct sk_buff *skb, const struct net_device *dev) |
| 333 | { |
| 334 | struct chnl_net *priv; |
| 335 | u8 loop; |
| 336 | priv = netdev_priv(dev); |
| 337 | NLA_PUT_U32(skb, IFLA_CAIF_IPV4_CONNID, |
| 338 | priv->conn_req.sockaddr.u.dgm.connection_id); |
| 339 | NLA_PUT_U32(skb, IFLA_CAIF_IPV6_CONNID, |
| 340 | priv->conn_req.sockaddr.u.dgm.connection_id); |
| 341 | loop = priv->conn_req.protocol == CAIFPROTO_DATAGRAM_LOOP; |
| 342 | NLA_PUT_U8(skb, IFLA_CAIF_LOOPBACK, loop); |
| 343 | |
| 344 | |
| 345 | return 0; |
| 346 | nla_put_failure: |
| 347 | return -EMSGSIZE; |
| 348 | |
| 349 | } |
| 350 | |
| 351 | static void caif_netlink_parms(struct nlattr *data[], |
| 352 | struct caif_connect_request *conn_req) |
| 353 | { |
| 354 | if (!data) { |
| 355 | pr_warning("CAIF: %s: no params data found\n", __func__); |
| 356 | return; |
| 357 | } |
| 358 | if (data[IFLA_CAIF_IPV4_CONNID]) |
| 359 | conn_req->sockaddr.u.dgm.connection_id = |
| 360 | nla_get_u32(data[IFLA_CAIF_IPV4_CONNID]); |
| 361 | if (data[IFLA_CAIF_IPV6_CONNID]) |
| 362 | conn_req->sockaddr.u.dgm.connection_id = |
| 363 | nla_get_u32(data[IFLA_CAIF_IPV6_CONNID]); |
| 364 | if (data[IFLA_CAIF_LOOPBACK]) { |
| 365 | if (nla_get_u8(data[IFLA_CAIF_LOOPBACK])) |
| 366 | conn_req->protocol = CAIFPROTO_DATAGRAM_LOOP; |
| 367 | else |
| 368 | conn_req->protocol = CAIFPROTO_DATAGRAM; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | static int ipcaif_newlink(struct net *src_net, struct net_device *dev, |
| 373 | struct nlattr *tb[], struct nlattr *data[]) |
| 374 | { |
| 375 | int ret; |
| 376 | struct chnl_net *caifdev; |
| 377 | ASSERT_RTNL(); |
| 378 | caifdev = netdev_priv(dev); |
| 379 | caif_netlink_parms(data, &caifdev->conn_req); |
| 380 | ret = register_netdevice(dev); |
| 381 | if (ret) |
| 382 | pr_warning("CAIF: %s(): device rtml registration failed\n", |
| 383 | __func__); |
| 384 | return ret; |
| 385 | } |
| 386 | |
| 387 | static int ipcaif_changelink(struct net_device *dev, struct nlattr *tb[], |
| 388 | struct nlattr *data[]) |
| 389 | { |
| 390 | struct chnl_net *caifdev; |
| 391 | ASSERT_RTNL(); |
| 392 | caifdev = netdev_priv(dev); |
| 393 | caif_netlink_parms(data, &caifdev->conn_req); |
| 394 | netdev_state_change(dev); |
| 395 | return 0; |
| 396 | } |
| 397 | |
| 398 | static size_t ipcaif_get_size(const struct net_device *dev) |
| 399 | { |
| 400 | return |
| 401 | /* IFLA_CAIF_IPV4_CONNID */ |
| 402 | nla_total_size(4) + |
| 403 | /* IFLA_CAIF_IPV6_CONNID */ |
| 404 | nla_total_size(4) + |
| 405 | /* IFLA_CAIF_LOOPBACK */ |
| 406 | nla_total_size(2) + |
| 407 | 0; |
| 408 | } |
| 409 | |
| 410 | static const struct nla_policy ipcaif_policy[IFLA_CAIF_MAX + 1] = { |
| 411 | [IFLA_CAIF_IPV4_CONNID] = { .type = NLA_U32 }, |
| 412 | [IFLA_CAIF_IPV6_CONNID] = { .type = NLA_U32 }, |
| 413 | [IFLA_CAIF_LOOPBACK] = { .type = NLA_U8 } |
| 414 | }; |
| 415 | |
| 416 | |
| 417 | static struct rtnl_link_ops ipcaif_link_ops __read_mostly = { |
| 418 | .kind = "caif", |
| 419 | .priv_size = sizeof(struct chnl_net), |
| 420 | .setup = ipcaif_net_setup, |
| 421 | .maxtype = IFLA_CAIF_MAX, |
| 422 | .policy = ipcaif_policy, |
| 423 | .newlink = ipcaif_newlink, |
| 424 | .changelink = ipcaif_changelink, |
| 425 | .get_size = ipcaif_get_size, |
| 426 | .fill_info = ipcaif_fill_info, |
| 427 | |
| 428 | }; |
| 429 | |
| 430 | static int __init chnl_init_module(void) |
| 431 | { |
| 432 | return rtnl_link_register(&ipcaif_link_ops); |
| 433 | } |
| 434 | |
| 435 | static void __exit chnl_exit_module(void) |
| 436 | { |
| 437 | struct chnl_net *dev = NULL; |
| 438 | struct list_head *list_node; |
| 439 | struct list_head *_tmp; |
| 440 | rtnl_link_unregister(&ipcaif_link_ops); |
| 441 | rtnl_lock(); |
| 442 | list_for_each_safe(list_node, _tmp, &chnl_net_list) { |
| 443 | dev = list_entry(list_node, struct chnl_net, list_field); |
| 444 | list_del(list_node); |
| 445 | delete_device(dev); |
| 446 | } |
| 447 | rtnl_unlock(); |
| 448 | } |
| 449 | |
| 450 | module_init(chnl_init_module); |
| 451 | module_exit(chnl_exit_module); |