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datapath: Rename brc_sysfs_* to dp_sysfs_*.
[mirror_ovs.git] / datapath / datapath.c
1 /*
2 * Copyright (c) 2007, 2008, 2009 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
4 *
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
7 */
8
9 /* Functions for managing the dp interface/device. */
10
11 #include <linux/init.h>
12 #include <linux/module.h>
13 #include <linux/fs.h>
14 #include <linux/if_arp.h>
15 #include <linux/if_bridge.h>
16 #include <linux/if_vlan.h>
17 #include <linux/in.h>
18 #include <linux/ip.h>
19 #include <linux/delay.h>
20 #include <linux/time.h>
21 #include <linux/etherdevice.h>
22 #include <linux/kernel.h>
23 #include <linux/kthread.h>
24 #include <linux/llc.h>
25 #include <linux/mutex.h>
26 #include <linux/percpu.h>
27 #include <linux/rcupdate.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/version.h>
31 #include <linux/ethtool.h>
32 #include <linux/random.h>
33 #include <linux/wait.h>
34 #include <asm/system.h>
35 #include <asm/div64.h>
36 #include <asm/bug.h>
37 #include <linux/netfilter_bridge.h>
38 #include <linux/netfilter_ipv4.h>
39 #include <linux/inetdevice.h>
40 #include <linux/list.h>
41 #include <linux/rculist.h>
42 #include <linux/workqueue.h>
43 #include <linux/dmi.h>
44 #include <net/llc.h>
45
46 #include "openvswitch/datapath-protocol.h"
47 #include "datapath.h"
48 #include "actions.h"
49 #include "dp_dev.h"
50 #include "flow.h"
51
52 #include "compat.h"
53
54
55 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
56 EXPORT_SYMBOL(dp_ioctl_hook);
57
58 /* Datapaths. Protected on the read side by rcu_read_lock, on the write side
59 * by dp_mutex. dp_mutex is almost completely redundant with genl_mutex
60 * maintained by the Generic Netlink code, but the timeout path needs mutual
61 * exclusion too.
62 *
63 * dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
64 * lock first.
65 *
66 * It is safe to access the datapath and net_bridge_port structures with just
67 * dp_mutex.
68 */
69 static struct datapath *dps[ODP_MAX];
70 static DEFINE_MUTEX(dp_mutex);
71
72 /* Number of milliseconds between runs of the maintenance thread. */
73 #define MAINT_SLEEP_MSECS 1000
74
75 static int new_nbp(struct datapath *, struct net_device *, int port_no);
76
77 /* Must be called with rcu_read_lock or dp_mutex. */
78 struct datapath *get_dp(int dp_idx)
79 {
80 if (dp_idx < 0 || dp_idx >= ODP_MAX)
81 return NULL;
82 return rcu_dereference(dps[dp_idx]);
83 }
84 EXPORT_SYMBOL_GPL(get_dp);
85
86 struct datapath *get_dp_locked(int dp_idx)
87 {
88 struct datapath *dp;
89
90 mutex_lock(&dp_mutex);
91 dp = get_dp(dp_idx);
92 if (dp)
93 mutex_lock(&dp->mutex);
94 mutex_unlock(&dp_mutex);
95 return dp;
96 }
97
98 static inline size_t br_nlmsg_size(void)
99 {
100 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
101 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
102 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
103 + nla_total_size(4) /* IFLA_MASTER */
104 + nla_total_size(4) /* IFLA_MTU */
105 + nla_total_size(4) /* IFLA_LINK */
106 + nla_total_size(1); /* IFLA_OPERSTATE */
107 }
108
109 static int dp_fill_ifinfo(struct sk_buff *skb,
110 const struct net_bridge_port *port,
111 int event, unsigned int flags)
112 {
113 const struct datapath *dp = port->dp;
114 const struct net_device *dev = port->dev;
115 struct ifinfomsg *hdr;
116 struct nlmsghdr *nlh;
117
118 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
119 if (nlh == NULL)
120 return -EMSGSIZE;
121
122 hdr = nlmsg_data(nlh);
123 hdr->ifi_family = AF_BRIDGE;
124 hdr->__ifi_pad = 0;
125 hdr->ifi_type = dev->type;
126 hdr->ifi_index = dev->ifindex;
127 hdr->ifi_flags = dev_get_flags(dev);
128 hdr->ifi_change = 0;
129
130 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
131 NLA_PUT_U32(skb, IFLA_MASTER, dp->ports[ODPP_LOCAL]->dev->ifindex);
132 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
133 #ifdef IFLA_OPERSTATE
134 NLA_PUT_U8(skb, IFLA_OPERSTATE,
135 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
136 #endif
137
138 if (dev->addr_len)
139 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
140
141 if (dev->ifindex != dev->iflink)
142 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
143
144 return nlmsg_end(skb, nlh);
145
146 nla_put_failure:
147 nlmsg_cancel(skb, nlh);
148 return -EMSGSIZE;
149 }
150
151 static void dp_ifinfo_notify(int event, struct net_bridge_port *port)
152 {
153 struct net *net = dev_net(port->dev);
154 struct sk_buff *skb;
155 int err = -ENOBUFS;
156
157 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
158 if (skb == NULL)
159 goto errout;
160
161 err = dp_fill_ifinfo(skb, port, event, 0);
162 if (err < 0) {
163 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
164 WARN_ON(err == -EMSGSIZE);
165 kfree_skb(skb);
166 goto errout;
167 }
168 err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
169 errout:
170 if (err < 0)
171 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
172 }
173
174 static int create_dp(int dp_idx, const char __user *devnamep)
175 {
176 struct net_device *dp_dev;
177 char devname[IFNAMSIZ];
178 struct datapath *dp;
179 int err;
180 int i;
181
182 if (devnamep) {
183 err = -EFAULT;
184 if (strncpy_from_user(devname, devnamep, IFNAMSIZ - 1) < 0)
185 goto err;
186 devname[IFNAMSIZ - 1] = '\0';
187 } else {
188 snprintf(devname, sizeof devname, "of%d", dp_idx);
189 }
190
191 rtnl_lock();
192 mutex_lock(&dp_mutex);
193 err = -ENODEV;
194 if (!try_module_get(THIS_MODULE))
195 goto err_unlock;
196
197 /* Exit early if a datapath with that number already exists.
198 * (We don't use -EEXIST because that's ambiguous with 'devname'
199 * conflicting with an existing network device name.) */
200 err = -EBUSY;
201 if (get_dp(dp_idx))
202 goto err_put_module;
203
204 err = -ENOMEM;
205 dp = kzalloc(sizeof *dp, GFP_KERNEL);
206 if (dp == NULL)
207 goto err_put_module;
208 INIT_LIST_HEAD(&dp->port_list);
209 mutex_init(&dp->mutex);
210 dp->dp_idx = dp_idx;
211 for (i = 0; i < DP_N_QUEUES; i++)
212 skb_queue_head_init(&dp->queues[i]);
213 init_waitqueue_head(&dp->waitqueue);
214
215 /* Allocate table. */
216 err = -ENOMEM;
217 rcu_assign_pointer(dp->table, dp_table_create(DP_L1_SIZE));
218 if (!dp->table)
219 goto err_free_dp;
220
221 /* Setup our datapath device */
222 dp_dev = dp_dev_create(dp, devname, ODPP_LOCAL);
223 err = PTR_ERR(dp_dev);
224 if (IS_ERR(dp_dev))
225 goto err_destroy_table;
226
227 err = new_nbp(dp, dp_dev, ODPP_LOCAL);
228 if (err) {
229 dp_dev_destroy(dp_dev);
230 goto err_destroy_table;
231 }
232
233 dp->drop_frags = 0;
234 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
235 if (!dp->stats_percpu)
236 goto err_destroy_local_port;
237
238 rcu_assign_pointer(dps[dp_idx], dp);
239 mutex_unlock(&dp_mutex);
240 rtnl_unlock();
241
242 #ifdef SUPPORT_SYSFS
243 dp_sysfs_add_dp(dp);
244 #endif
245
246 return 0;
247
248 err_destroy_local_port:
249 dp_del_port(dp->ports[ODPP_LOCAL]);
250 err_destroy_table:
251 dp_table_destroy(dp->table, 0);
252 err_free_dp:
253 kfree(dp);
254 err_put_module:
255 module_put(THIS_MODULE);
256 err_unlock:
257 mutex_unlock(&dp_mutex);
258 rtnl_unlock();
259 err:
260 return err;
261 }
262
263 static void do_destroy_dp(struct datapath *dp)
264 {
265 struct net_bridge_port *p, *n;
266 int i;
267
268 list_for_each_entry_safe (p, n, &dp->port_list, node)
269 if (p->port_no != ODPP_LOCAL)
270 dp_del_port(p);
271
272 #ifdef SUPPORT_SYSFS
273 dp_sysfs_del_dp(dp);
274 #endif
275
276 rcu_assign_pointer(dps[dp->dp_idx], NULL);
277
278 dp_del_port(dp->ports[ODPP_LOCAL]);
279
280 dp_table_destroy(dp->table, 1);
281
282 for (i = 0; i < DP_N_QUEUES; i++)
283 skb_queue_purge(&dp->queues[i]);
284 for (i = 0; i < DP_MAX_GROUPS; i++)
285 kfree(dp->groups[i]);
286 free_percpu(dp->stats_percpu);
287 kfree(dp);
288 module_put(THIS_MODULE);
289 }
290
291 static int destroy_dp(int dp_idx)
292 {
293 struct datapath *dp;
294 int err;
295
296 rtnl_lock();
297 mutex_lock(&dp_mutex);
298 dp = get_dp(dp_idx);
299 err = -ENODEV;
300 if (!dp)
301 goto err_unlock;
302
303 do_destroy_dp(dp);
304 err = 0;
305
306 err_unlock:
307 mutex_unlock(&dp_mutex);
308 rtnl_unlock();
309 return err;
310 }
311
312 /* Called with RTNL lock and dp_mutex. */
313 static int new_nbp(struct datapath *dp, struct net_device *dev, int port_no)
314 {
315 struct net_bridge_port *p;
316
317 if (dev->br_port != NULL)
318 return -EBUSY;
319
320 p = kzalloc(sizeof(*p), GFP_KERNEL);
321 if (!p)
322 return -ENOMEM;
323
324 dev_set_promiscuity(dev, 1);
325 dev_hold(dev);
326 p->port_no = port_no;
327 p->dp = dp;
328 p->dev = dev;
329 if (!is_dp_dev(dev))
330 rcu_assign_pointer(dev->br_port, p);
331 else {
332 /* It would make sense to assign dev->br_port here too, but
333 * that causes packets received on internal ports to get caught
334 * in dp_frame_hook(). In turn dp_frame_hook() can reject them
335 * back to network stack, but that's a waste of time. */
336 }
337 rcu_assign_pointer(dp->ports[port_no], p);
338 list_add_rcu(&p->node, &dp->port_list);
339 dp->n_ports++;
340
341 dp_ifinfo_notify(RTM_NEWLINK, p);
342
343 return 0;
344 }
345
346 static int add_port(int dp_idx, struct odp_port __user *portp)
347 {
348 struct net_device *dev;
349 struct datapath *dp;
350 struct odp_port port;
351 int port_no;
352 int err;
353
354 err = -EFAULT;
355 if (copy_from_user(&port, portp, sizeof port))
356 goto out;
357 port.devname[IFNAMSIZ - 1] = '\0';
358 port_no = port.port;
359
360 err = -EINVAL;
361 if (port_no < 0 || port_no >= DP_MAX_PORTS)
362 goto out;
363
364 rtnl_lock();
365 dp = get_dp_locked(dp_idx);
366 err = -ENODEV;
367 if (!dp)
368 goto out_unlock_rtnl;
369
370 err = -EEXIST;
371 if (dp->ports[port_no])
372 goto out_unlock_dp;
373
374 if (!(port.flags & ODP_PORT_INTERNAL)) {
375 err = -ENODEV;
376 dev = dev_get_by_name(&init_net, port.devname);
377 if (!dev)
378 goto out_unlock_dp;
379
380 err = -EINVAL;
381 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER ||
382 is_dp_dev(dev))
383 goto out_put;
384 } else {
385 dev = dp_dev_create(dp, port.devname, port_no);
386 err = PTR_ERR(dev);
387 if (IS_ERR(dev))
388 goto out_unlock_dp;
389 dev_hold(dev);
390 }
391
392 err = new_nbp(dp, dev, port_no);
393 if (err)
394 goto out_put;
395
396 #ifdef SUPPORT_SYSFS
397 dp_sysfs_add_if(dp->ports[port_no]);
398 #endif
399
400 out_put:
401 dev_put(dev);
402 out_unlock_dp:
403 mutex_unlock(&dp->mutex);
404 out_unlock_rtnl:
405 rtnl_unlock();
406 out:
407 return err;
408 }
409
410 int dp_del_port(struct net_bridge_port *p)
411 {
412 ASSERT_RTNL();
413
414 #ifdef SUPPORT_SYSFS
415 if (p->port_no != ODPP_LOCAL)
416 sysfs_remove_link(&p->dp->ifobj, p->dev->name);
417 #endif
418 dp_ifinfo_notify(RTM_DELLINK, p);
419
420 p->dp->n_ports--;
421
422 if (is_dp_dev(p->dev)) {
423 /* Make sure that no packets arrive from now on, since
424 * dp_dev_xmit() will try to find itself through
425 * p->dp->ports[], and we're about to set that to null. */
426 netif_tx_disable(p->dev);
427 }
428
429 /* First drop references to device. */
430 dev_set_promiscuity(p->dev, -1);
431 list_del_rcu(&p->node);
432 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
433 rcu_assign_pointer(p->dev->br_port, NULL);
434
435 /* Then wait until no one is still using it, and destroy it. */
436 synchronize_rcu();
437
438 if (is_dp_dev(p->dev)) {
439 dp_dev_destroy(p->dev);
440 }
441 if (p->port_no != ODPP_LOCAL) {
442 dp_sysfs_del_if(p);
443 } else {
444 dev_put(p->dev);
445 kfree(p);
446 }
447
448 return 0;
449 }
450
451 static int del_port(int dp_idx, int port_no)
452 {
453 struct net_bridge_port *p;
454 struct datapath *dp;
455 LIST_HEAD(dp_devs);
456 int err;
457
458 err = -EINVAL;
459 if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
460 goto out;
461
462 rtnl_lock();
463 dp = get_dp_locked(dp_idx);
464 err = -ENODEV;
465 if (!dp)
466 goto out_unlock_rtnl;
467
468 p = dp->ports[port_no];
469 err = -ENOENT;
470 if (!p)
471 goto out_unlock_dp;
472
473 err = dp_del_port(p);
474
475 out_unlock_dp:
476 mutex_unlock(&dp->mutex);
477 out_unlock_rtnl:
478 rtnl_unlock();
479 out:
480 return err;
481 }
482
483 /* Must be called with rcu_read_lock. */
484 static void
485 do_port_input(struct net_bridge_port *p, struct sk_buff *skb)
486 {
487 /* Make our own copy of the packet. Otherwise we will mangle the
488 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
489 * (No one comes after us, since we tell handle_bridge() that we took
490 * the packet.) */
491 skb = skb_share_check(skb, GFP_ATOMIC);
492 if (!skb)
493 return;
494
495 /* Push the Ethernet header back on. */
496 skb_push(skb, ETH_HLEN);
497 skb_reset_mac_header(skb);
498 dp_process_received_packet(skb, p);
499 }
500
501 /* Must be called with rcu_read_lock and with bottom-halves disabled. */
502 void dp_process_received_packet(struct sk_buff *skb, struct net_bridge_port *p)
503 {
504 struct datapath *dp = p->dp;
505 struct dp_stats_percpu *stats;
506 struct odp_flow_key key;
507 struct sw_flow *flow;
508
509 WARN_ON_ONCE(skb_shared(skb));
510
511 /* BHs are off so we don't have to use get_cpu()/put_cpu() here. */
512 stats = percpu_ptr(dp->stats_percpu, smp_processor_id());
513
514 if (flow_extract(skb, p ? p->port_no : ODPP_NONE, &key)) {
515 if (dp->drop_frags) {
516 kfree_skb(skb);
517 stats->n_frags++;
518 return;
519 }
520 }
521
522 flow = dp_table_lookup(rcu_dereference(dp->table), &key);
523 if (flow) {
524 struct sw_flow_actions *acts = rcu_dereference(flow->sf_acts);
525 flow_used(flow, skb);
526 execute_actions(dp, skb, &key, acts->actions, acts->n_actions,
527 GFP_ATOMIC);
528 stats->n_hit++;
529 } else {
530 stats->n_missed++;
531 dp_output_control(dp, skb, _ODPL_MISS_NR, 0);
532 }
533 }
534
535 /*
536 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
537 * different set of devices!)
538 */
539 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
540 /* Called with rcu_read_lock and bottom-halves disabled. */
541 static struct sk_buff *dp_frame_hook(struct net_bridge_port *p,
542 struct sk_buff *skb)
543 {
544 do_port_input(p, skb);
545 return NULL;
546 }
547 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
548 /* Called with rcu_read_lock and bottom-halves disabled. */
549 static int dp_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
550 {
551 do_port_input(p, *pskb);
552 return 1;
553 }
554 #else
555 #error
556 #endif
557
558 #ifdef CONFIG_XEN
559 /* This code is copied verbatim from net/dev/core.c in Xen's
560 * linux-2.6.18-92.1.10.el5.xs5.0.0.394.644. We can't call those functions
561 * directly because they aren't exported. */
562 static int skb_pull_up_to(struct sk_buff *skb, void *ptr)
563 {
564 if (ptr < (void *)skb->tail)
565 return 1;
566 if (__pskb_pull_tail(skb,
567 ptr - (void *)skb->data - skb_headlen(skb))) {
568 return 1;
569 } else {
570 return 0;
571 }
572 }
573
574 int skb_checksum_setup(struct sk_buff *skb)
575 {
576 if (skb->proto_csum_blank) {
577 if (skb->protocol != htons(ETH_P_IP))
578 goto out;
579 if (!skb_pull_up_to(skb, skb->nh.iph + 1))
580 goto out;
581 skb->h.raw = (unsigned char *)skb->nh.iph + 4*skb->nh.iph->ihl;
582 switch (skb->nh.iph->protocol) {
583 case IPPROTO_TCP:
584 skb->csum = offsetof(struct tcphdr, check);
585 break;
586 case IPPROTO_UDP:
587 skb->csum = offsetof(struct udphdr, check);
588 break;
589 default:
590 if (net_ratelimit())
591 printk(KERN_ERR "Attempting to checksum a non-"
592 "TCP/UDP packet, dropping a protocol"
593 " %d packet", skb->nh.iph->protocol);
594 goto out;
595 }
596 if (!skb_pull_up_to(skb, skb->h.raw + skb->csum + 2))
597 goto out;
598 skb->ip_summed = CHECKSUM_HW;
599 skb->proto_csum_blank = 0;
600 }
601 return 0;
602 out:
603 return -EPROTO;
604 }
605 #endif
606
607 int
608 dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
609 u32 arg)
610 {
611 struct dp_stats_percpu *stats;
612 struct sk_buff_head *queue;
613 int port_no;
614 int err;
615
616 WARN_ON_ONCE(skb_shared(skb));
617 BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR);
618
619 queue = &dp->queues[queue_no];
620 err = -ENOBUFS;
621 if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
622 goto err_kfree_skb;
623
624 /* If a checksum-deferred packet is forwarded to the controller,
625 * correct the pointers and checksum. This happens on a regular basis
626 * only on Xen (the CHECKSUM_HW case), on which VMs can pass up packets
627 * that do not have their checksum computed. We also implement it for
628 * the non-Xen case, but it is difficult to trigger or test this case
629 * there, hence the WARN_ON_ONCE().
630 */
631 err = skb_checksum_setup(skb);
632 if (err)
633 goto err_kfree_skb;
634 #ifndef CHECKSUM_HW
635 if (skb->ip_summed == CHECKSUM_PARTIAL) {
636 WARN_ON_ONCE(1);
637 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
638 /* Until 2.6.22, the start of the transport header was also the
639 * start of data to be checksummed. Linux 2.6.22 introduced
640 * the csum_start field for this purpose, but we should point
641 * the transport header to it anyway for backward
642 * compatibility, as dev_queue_xmit() does even in 2.6.28. */
643 skb_set_transport_header(skb, skb->csum_start -
644 skb_headroom(skb));
645 #endif
646 err = skb_checksum_help(skb);
647 if (err)
648 goto err_kfree_skb;
649 }
650 #else
651 if (skb->ip_summed == CHECKSUM_HW) {
652 err = skb_checksum_help(skb, 0);
653 if (err)
654 goto err_kfree_skb;
655 }
656 #endif
657
658 /* Break apart GSO packets into their component pieces. Otherwise
659 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
660 if (skb_is_gso(skb)) {
661 struct sk_buff *nskb = skb_gso_segment(skb, 0);
662 if (nskb) {
663 kfree_skb(skb);
664 skb = nskb;
665 if (unlikely(IS_ERR(skb))) {
666 err = PTR_ERR(skb);
667 goto err;
668 }
669 } else {
670 /* XXX This case might not be possible. It's hard to
671 * tell from the skb_gso_segment() code and comment. */
672 }
673 }
674
675 /* Figure out port number. */
676 port_no = ODPP_LOCAL;
677 if (skb->dev) {
678 if (skb->dev->br_port)
679 port_no = skb->dev->br_port->port_no;
680 else if (is_dp_dev(skb->dev))
681 port_no = dp_dev_priv(skb->dev)->port_no;
682 }
683
684 /* Append each packet to queue. There will be only one packet unless
685 * we broke up a GSO packet above. */
686 do {
687 struct odp_msg *header;
688 struct sk_buff *nskb = skb->next;
689 skb->next = NULL;
690
691 err = skb_cow(skb, sizeof *header);
692 if (err) {
693 while (nskb) {
694 kfree_skb(skb);
695 skb = nskb;
696 nskb = skb->next;
697 }
698 goto err_kfree_skb;
699 }
700
701 header = (struct odp_msg*)__skb_push(skb, sizeof *header);
702 header->type = queue_no;
703 header->length = skb->len;
704 header->port = port_no;
705 header->reserved = 0;
706 header->arg = arg;
707 skb_queue_tail(queue, skb);
708
709 skb = nskb;
710 } while (skb);
711
712 wake_up_interruptible(&dp->waitqueue);
713 return 0;
714
715 err_kfree_skb:
716 kfree_skb(skb);
717 err:
718 stats = percpu_ptr(dp->stats_percpu, get_cpu());
719 stats->n_lost++;
720 put_cpu();
721
722 return err;
723 }
724
725 static int flush_flows(struct datapath *dp)
726 {
727 dp->n_flows = 0;
728 return dp_table_flush(dp);
729 }
730
731 static int validate_actions(const struct sw_flow_actions *actions)
732 {
733 unsigned int i;
734
735 for (i = 0; i < actions->n_actions; i++) {
736 const union odp_action *a = &actions->actions[i];
737 switch (a->type) {
738 case ODPAT_OUTPUT:
739 if (a->output.port >= DP_MAX_PORTS)
740 return -EINVAL;
741 break;
742
743 case ODPAT_OUTPUT_GROUP:
744 if (a->output_group.group >= DP_MAX_GROUPS)
745 return -EINVAL;
746 break;
747
748 case ODPAT_SET_VLAN_VID:
749 if (a->vlan_vid.vlan_vid & htons(~VLAN_VID_MASK))
750 return -EINVAL;
751 break;
752
753 case ODPAT_SET_VLAN_PCP:
754 if (a->vlan_pcp.vlan_pcp & ~VLAN_PCP_MASK)
755 return -EINVAL;
756 break;
757
758 default:
759 if (a->type >= ODPAT_N_ACTIONS)
760 return -EOPNOTSUPP;
761 break;
762 }
763 }
764
765 return 0;
766 }
767
768 static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
769 {
770 struct sw_flow_actions *actions;
771 int error;
772
773 actions = flow_actions_alloc(flow->n_actions);
774 error = PTR_ERR(actions);
775 if (IS_ERR(actions))
776 goto error;
777
778 error = -EFAULT;
779 if (copy_from_user(actions->actions, flow->actions,
780 flow->n_actions * sizeof(union odp_action)))
781 goto error_free_actions;
782 error = validate_actions(actions);
783 if (error)
784 goto error_free_actions;
785
786 return actions;
787
788 error_free_actions:
789 kfree(actions);
790 error:
791 return ERR_PTR(error);
792 }
793
794 static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
795 {
796 if (flow->used.tv_sec) {
797 stats->used_sec = flow->used.tv_sec;
798 stats->used_nsec = flow->used.tv_nsec;
799 } else {
800 stats->used_sec = 0;
801 stats->used_nsec = 0;
802 }
803 stats->n_packets = flow->packet_count;
804 stats->n_bytes = flow->byte_count;
805 stats->ip_tos = flow->ip_tos;
806 stats->tcp_flags = flow->tcp_flags;
807 }
808
809 static void clear_stats(struct sw_flow *flow)
810 {
811 flow->used.tv_sec = flow->used.tv_nsec = 0;
812 flow->tcp_flags = 0;
813 flow->ip_tos = 0;
814 flow->packet_count = 0;
815 flow->byte_count = 0;
816 }
817
818 static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
819 {
820 struct odp_flow_put uf;
821 struct sw_flow *flow, **bucket;
822 struct dp_table *table;
823 struct odp_flow_stats stats;
824 int error;
825
826 error = -EFAULT;
827 if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
828 goto error;
829 uf.flow.key.reserved = 0;
830
831 retry:
832 table = rcu_dereference(dp->table);
833 bucket = dp_table_lookup_for_insert(table, &uf.flow.key);
834 if (!bucket) {
835 /* No such flow, and the slots where it could go are full. */
836 error = uf.flags & ODPPF_CREATE ? -EXFULL : -ENOENT;
837 goto error;
838 } else if (!*bucket) {
839 /* No such flow, but we found an available slot for it. */
840 struct sw_flow_actions *acts;
841
842 error = -ENOENT;
843 if (!(uf.flags & ODPPF_CREATE))
844 goto error;
845
846 /* Expand table, if necessary, to make room. */
847 if (dp->n_flows * 4 >= table->n_buckets &&
848 table->n_buckets < DP_MAX_BUCKETS) {
849 error = dp_table_expand(dp);
850 if (error)
851 goto error;
852
853 /* The bucket's location has changed. Try again. */
854 goto retry;
855 }
856
857 /* Allocate flow. */
858 error = -ENOMEM;
859 flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
860 if (flow == NULL)
861 goto error;
862 flow->key = uf.flow.key;
863 spin_lock_init(&flow->lock);
864 clear_stats(flow);
865
866 /* Obtain actions. */
867 acts = get_actions(&uf.flow);
868 error = PTR_ERR(acts);
869 if (IS_ERR(acts))
870 goto error_free_flow;
871 rcu_assign_pointer(flow->sf_acts, acts);
872
873 /* Put flow in bucket. */
874 rcu_assign_pointer(*bucket, flow);
875 dp->n_flows++;
876 memset(&stats, 0, sizeof(struct odp_flow_stats));
877 } else {
878 /* We found a matching flow. */
879 struct sw_flow *flow = *rcu_dereference(bucket);
880 struct sw_flow_actions *old_acts, *new_acts;
881 unsigned long int flags;
882
883 /* Bail out if we're not allowed to modify an existing flow. */
884 error = -EEXIST;
885 if (!(uf.flags & ODPPF_MODIFY))
886 goto error;
887
888 /* Swap actions. */
889 new_acts = get_actions(&uf.flow);
890 error = PTR_ERR(new_acts);
891 if (IS_ERR(new_acts))
892 goto error;
893 old_acts = rcu_dereference(flow->sf_acts);
894 if (old_acts->n_actions != new_acts->n_actions ||
895 memcmp(old_acts->actions, new_acts->actions,
896 sizeof(union odp_action) * old_acts->n_actions)) {
897 rcu_assign_pointer(flow->sf_acts, new_acts);
898 flow_deferred_free_acts(old_acts);
899 } else {
900 kfree(new_acts);
901 }
902
903 /* Fetch stats, then clear them if necessary. */
904 spin_lock_irqsave(&flow->lock, flags);
905 get_stats(flow, &stats);
906 if (uf.flags & ODPPF_ZERO_STATS)
907 clear_stats(flow);
908 spin_unlock_irqrestore(&flow->lock, flags);
909 }
910
911 /* Copy stats to userspace. */
912 if (__copy_to_user(&ufp->flow.stats, &stats,
913 sizeof(struct odp_flow_stats)))
914 return -EFAULT;
915 return 0;
916
917 error_free_flow:
918 kmem_cache_free(flow_cache, flow);
919 error:
920 return error;
921 }
922
923 static int put_actions(const struct sw_flow *flow, struct odp_flow __user *ufp)
924 {
925 union odp_action __user *actions;
926 struct sw_flow_actions *sf_acts;
927 u32 n_actions;
928
929 if (__get_user(actions, &ufp->actions) ||
930 __get_user(n_actions, &ufp->n_actions))
931 return -EFAULT;
932
933 if (!n_actions)
934 return 0;
935 if (ufp->n_actions > INT_MAX / sizeof(union odp_action))
936 return -EINVAL;
937
938 sf_acts = rcu_dereference(flow->sf_acts);
939 if (__put_user(sf_acts->n_actions, &ufp->n_actions) ||
940 (actions && copy_to_user(actions, sf_acts->actions,
941 sizeof(union odp_action) *
942 min(sf_acts->n_actions, n_actions))))
943 return -EFAULT;
944
945 return 0;
946 }
947
948 static int answer_query(struct sw_flow *flow, struct odp_flow __user *ufp)
949 {
950 struct odp_flow_stats stats;
951 unsigned long int flags;
952
953 spin_lock_irqsave(&flow->lock, flags);
954 get_stats(flow, &stats);
955 spin_unlock_irqrestore(&flow->lock, flags);
956
957 if (__copy_to_user(&ufp->stats, &stats, sizeof(struct odp_flow_stats)))
958 return -EFAULT;
959 return put_actions(flow, ufp);
960 }
961
962 static int del_or_query_flow(struct datapath *dp,
963 struct odp_flow __user *ufp,
964 unsigned int cmd)
965 {
966 struct dp_table *table = rcu_dereference(dp->table);
967 struct odp_flow uf;
968 struct sw_flow *flow;
969 int error;
970
971 error = -EFAULT;
972 if (copy_from_user(&uf, ufp, sizeof uf))
973 goto error;
974 uf.key.reserved = 0;
975
976 flow = dp_table_lookup(table, &uf.key);
977 error = -ENOENT;
978 if (!flow)
979 goto error;
980
981 if (cmd == ODP_FLOW_DEL) {
982 /* XXX redundant lookup */
983 error = dp_table_delete(table, flow);
984 if (error)
985 goto error;
986
987 /* XXX These statistics might lose a few packets, since other
988 * CPUs can be using this flow. We used to synchronize_rcu()
989 * to make sure that we get completely accurate stats, but that
990 * blows our performance, badly. */
991 dp->n_flows--;
992 error = answer_query(flow, ufp);
993 flow_deferred_free(flow);
994 } else {
995 error = answer_query(flow, ufp);
996 }
997
998 error:
999 return error;
1000 }
1001
1002 static int query_multiple_flows(struct datapath *dp,
1003 const struct odp_flowvec *flowvec)
1004 {
1005 struct dp_table *table = rcu_dereference(dp->table);
1006 int i;
1007 for (i = 0; i < flowvec->n_flows; i++) {
1008 struct __user odp_flow *ufp = &flowvec->flows[i];
1009 struct odp_flow uf;
1010 struct sw_flow *flow;
1011 int error;
1012
1013 if (__copy_from_user(&uf, ufp, sizeof uf))
1014 return -EFAULT;
1015 uf.key.reserved = 0;
1016
1017 flow = dp_table_lookup(table, &uf.key);
1018 if (!flow)
1019 error = __clear_user(&ufp->stats, sizeof ufp->stats);
1020 else
1021 error = answer_query(flow, ufp);
1022 if (error)
1023 return -EFAULT;
1024 }
1025 return flowvec->n_flows;
1026 }
1027
1028 struct list_flows_cbdata {
1029 struct odp_flow __user *uflows;
1030 int n_flows;
1031 int listed_flows;
1032 };
1033
1034 static int list_flow(struct sw_flow *flow, void *cbdata_)
1035 {
1036 struct list_flows_cbdata *cbdata = cbdata_;
1037 struct odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1038 int error;
1039
1040 if (__copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1041 return -EFAULT;
1042 error = answer_query(flow, ufp);
1043 if (error)
1044 return error;
1045
1046 if (cbdata->listed_flows >= cbdata->n_flows)
1047 return cbdata->listed_flows;
1048 return 0;
1049 }
1050
1051 static int list_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1052 {
1053 struct list_flows_cbdata cbdata;
1054 int error;
1055
1056 if (!flowvec->n_flows)
1057 return 0;
1058
1059 cbdata.uflows = flowvec->flows;
1060 cbdata.n_flows = flowvec->n_flows;
1061 cbdata.listed_flows = 0;
1062 error = dp_table_foreach(rcu_dereference(dp->table),
1063 list_flow, &cbdata);
1064 return error ? error : cbdata.listed_flows;
1065 }
1066
1067 static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1068 int (*function)(struct datapath *,
1069 const struct odp_flowvec *))
1070 {
1071 struct odp_flowvec __user *uflowvec;
1072 struct odp_flowvec flowvec;
1073 int retval;
1074
1075 uflowvec = (struct odp_flowvec __user *)argp;
1076 if (!access_ok(VERIFY_WRITE, uflowvec, sizeof *uflowvec) ||
1077 copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1078 return -EFAULT;
1079
1080 if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
1081 return -EINVAL;
1082
1083 if (!access_ok(VERIFY_WRITE, flowvec.flows,
1084 flowvec.n_flows * sizeof(struct odp_flow)))
1085 return -EFAULT;
1086
1087 retval = function(dp, &flowvec);
1088 return (retval < 0 ? retval
1089 : retval == flowvec.n_flows ? 0
1090 : __put_user(retval, &uflowvec->n_flows));
1091 }
1092
1093 static int do_execute(struct datapath *dp, const struct odp_execute *executep)
1094 {
1095 struct odp_execute execute;
1096 struct odp_flow_key key;
1097 struct sk_buff *skb;
1098 struct sw_flow_actions *actions;
1099 int err;
1100
1101 err = -EFAULT;
1102 if (copy_from_user(&execute, executep, sizeof execute))
1103 goto error;
1104
1105 err = -EINVAL;
1106 if (execute.length < ETH_HLEN || execute.length > 65535)
1107 goto error;
1108
1109 err = -ENOMEM;
1110 actions = flow_actions_alloc(execute.n_actions);
1111 if (!actions)
1112 goto error;
1113
1114 err = -EFAULT;
1115 if (copy_from_user(actions->actions, execute.actions,
1116 execute.n_actions * sizeof *execute.actions))
1117 goto error_free_actions;
1118
1119 err = validate_actions(actions);
1120 if (err)
1121 goto error_free_actions;
1122
1123 err = -ENOMEM;
1124 skb = alloc_skb(execute.length, GFP_KERNEL);
1125 if (!skb)
1126 goto error_free_actions;
1127 if (execute.in_port < DP_MAX_PORTS) {
1128 struct net_bridge_port *p = dp->ports[execute.in_port];
1129 if (p)
1130 skb->dev = p->dev;
1131 }
1132
1133 err = -EFAULT;
1134 if (copy_from_user(skb_put(skb, execute.length), execute.data,
1135 execute.length))
1136 goto error_free_skb;
1137
1138 flow_extract(skb, execute.in_port, &key);
1139 err = execute_actions(dp, skb, &key, actions->actions,
1140 actions->n_actions, GFP_KERNEL);
1141 kfree(actions);
1142 return err;
1143
1144 error_free_skb:
1145 kfree_skb(skb);
1146 error_free_actions:
1147 kfree(actions);
1148 error:
1149 return err;
1150 }
1151
1152 static int
1153 get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
1154 {
1155 struct odp_stats stats;
1156 int i;
1157
1158 stats.n_flows = dp->n_flows;
1159 stats.cur_capacity = rcu_dereference(dp->table)->n_buckets * 2;
1160 stats.max_capacity = DP_MAX_BUCKETS * 2;
1161 stats.n_ports = dp->n_ports;
1162 stats.max_ports = DP_MAX_PORTS;
1163 stats.max_groups = DP_MAX_GROUPS;
1164 stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
1165 for_each_possible_cpu(i) {
1166 const struct dp_stats_percpu *s;
1167 s = percpu_ptr(dp->stats_percpu, i);
1168 stats.n_frags += s->n_frags;
1169 stats.n_hit += s->n_hit;
1170 stats.n_missed += s->n_missed;
1171 stats.n_lost += s->n_lost;
1172 }
1173 stats.max_miss_queue = DP_MAX_QUEUE_LEN;
1174 stats.max_action_queue = DP_MAX_QUEUE_LEN;
1175 return copy_to_user(statsp, &stats, sizeof stats) ? -EFAULT : 0;
1176 }
1177
1178 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1179 int dp_min_mtu(const struct datapath *dp)
1180 {
1181 struct net_bridge_port *p;
1182 int mtu = 0;
1183
1184 ASSERT_RTNL();
1185
1186 list_for_each_entry_rcu (p, &dp->port_list, node) {
1187 struct net_device *dev = p->dev;
1188
1189 /* Skip any internal ports, since that's what we're trying to
1190 * set. */
1191 if (is_dp_dev(dev))
1192 continue;
1193
1194 if (!mtu || dev->mtu < mtu)
1195 mtu = dev->mtu;
1196 }
1197
1198 return mtu ? mtu : ETH_DATA_LEN;
1199 }
1200
1201 static int
1202 put_port(const struct net_bridge_port *p, struct odp_port __user *uop)
1203 {
1204 struct odp_port op;
1205 memset(&op, 0, sizeof op);
1206 strncpy(op.devname, p->dev->name, sizeof op.devname);
1207 op.port = p->port_no;
1208 op.flags = is_dp_dev(p->dev) ? ODP_PORT_INTERNAL : 0;
1209 return copy_to_user(uop, &op, sizeof op) ? -EFAULT : 0;
1210 }
1211
1212 static int
1213 query_port(struct datapath *dp, struct odp_port __user *uport)
1214 {
1215 struct odp_port port;
1216
1217 if (copy_from_user(&port, uport, sizeof port))
1218 return -EFAULT;
1219 if (port.devname[0]) {
1220 struct net_bridge_port *p;
1221 struct net_device *dev;
1222 int err;
1223
1224 port.devname[IFNAMSIZ - 1] = '\0';
1225
1226 dev = dev_get_by_name(&init_net, port.devname);
1227 if (!dev)
1228 return -ENODEV;
1229
1230 p = dev->br_port;
1231 if (!p && is_dp_dev(dev)) {
1232 struct dp_dev *dp_dev = dp_dev_priv(dev);
1233 if (dp_dev->dp == dp)
1234 p = dp->ports[dp_dev->port_no];
1235 }
1236 err = p && p->dp == dp ? put_port(p, uport) : -ENOENT;
1237 dev_put(dev);
1238
1239 return err;
1240 } else {
1241 if (port.port >= DP_MAX_PORTS)
1242 return -EINVAL;
1243 if (!dp->ports[port.port])
1244 return -ENOENT;
1245 return put_port(dp->ports[port.port], uport);
1246 }
1247 }
1248
1249 static int
1250 list_ports(struct datapath *dp, struct odp_portvec __user *pvp)
1251 {
1252 struct odp_portvec pv;
1253 struct net_bridge_port *p;
1254 int idx;
1255
1256 if (copy_from_user(&pv, pvp, sizeof pv))
1257 return -EFAULT;
1258
1259 idx = 0;
1260 if (pv.n_ports) {
1261 list_for_each_entry_rcu (p, &dp->port_list, node) {
1262 if (put_port(p, &pv.ports[idx]))
1263 return -EFAULT;
1264 if (idx++ >= pv.n_ports)
1265 break;
1266 }
1267 }
1268 return put_user(idx, &pvp->n_ports);
1269 }
1270
1271 /* RCU callback for freeing a dp_port_group */
1272 static void free_port_group(struct rcu_head *rcu)
1273 {
1274 struct dp_port_group *g = container_of(rcu, struct dp_port_group, rcu);
1275 kfree(g);
1276 }
1277
1278 static int
1279 set_port_group(struct datapath *dp, const struct odp_port_group __user *upg)
1280 {
1281 struct odp_port_group pg;
1282 struct dp_port_group *new_group, *old_group;
1283 int error;
1284
1285 error = -EFAULT;
1286 if (copy_from_user(&pg, upg, sizeof pg))
1287 goto error;
1288
1289 error = -EINVAL;
1290 if (pg.n_ports > DP_MAX_PORTS || pg.group >= DP_MAX_GROUPS)
1291 goto error;
1292
1293 error = -ENOMEM;
1294 new_group = kmalloc(sizeof *new_group + sizeof(u16) * pg.n_ports,
1295 GFP_KERNEL);
1296 if (!new_group)
1297 goto error;
1298
1299 new_group->n_ports = pg.n_ports;
1300 error = -EFAULT;
1301 if (copy_from_user(new_group->ports, pg.ports,
1302 sizeof(u16) * pg.n_ports))
1303 goto error_free;
1304
1305 old_group = rcu_dereference(dp->groups[pg.group]);
1306 rcu_assign_pointer(dp->groups[pg.group], new_group);
1307 if (old_group)
1308 call_rcu(&old_group->rcu, free_port_group);
1309 return 0;
1310
1311 error_free:
1312 kfree(new_group);
1313 error:
1314 return error;
1315 }
1316
1317 static int
1318 get_port_group(struct datapath *dp, struct odp_port_group *upg)
1319 {
1320 struct odp_port_group pg;
1321 struct dp_port_group *g;
1322 u16 n_copy;
1323
1324 if (copy_from_user(&pg, upg, sizeof pg))
1325 return -EFAULT;
1326
1327 if (pg.group >= DP_MAX_GROUPS)
1328 return -EINVAL;
1329
1330 g = dp->groups[pg.group];
1331 n_copy = g ? min_t(int, g->n_ports, pg.n_ports) : 0;
1332 if (n_copy && copy_to_user(pg.ports, g->ports, n_copy * sizeof(u16)))
1333 return -EFAULT;
1334
1335 if (put_user(g ? g->n_ports : 0, &upg->n_ports))
1336 return -EFAULT;
1337
1338 return 0;
1339 }
1340
1341 static long openvswitch_ioctl(struct file *f, unsigned int cmd,
1342 unsigned long argp)
1343 {
1344 int dp_idx = iminor(f->f_dentry->d_inode);
1345 struct datapath *dp;
1346 int drop_frags, listeners, port_no;
1347 int err;
1348
1349 /* Handle commands with special locking requirements up front. */
1350 switch (cmd) {
1351 case ODP_DP_CREATE:
1352 return create_dp(dp_idx, (char __user *)argp);
1353
1354 case ODP_DP_DESTROY:
1355 return destroy_dp(dp_idx);
1356
1357 case ODP_PORT_ADD:
1358 return add_port(dp_idx, (struct odp_port __user *)argp);
1359
1360 case ODP_PORT_DEL:
1361 err = get_user(port_no, (int __user *)argp);
1362 if (err)
1363 break;
1364 return del_port(dp_idx, port_no);
1365 }
1366
1367 dp = get_dp_locked(dp_idx);
1368 if (!dp)
1369 return -ENODEV;
1370
1371 switch (cmd) {
1372 case ODP_DP_STATS:
1373 err = get_dp_stats(dp, (struct odp_stats __user *)argp);
1374 break;
1375
1376 case ODP_GET_DROP_FRAGS:
1377 err = put_user(dp->drop_frags, (int __user *)argp);
1378 break;
1379
1380 case ODP_SET_DROP_FRAGS:
1381 err = get_user(drop_frags, (int __user *)argp);
1382 if (err)
1383 break;
1384 err = -EINVAL;
1385 if (drop_frags != 0 && drop_frags != 1)
1386 break;
1387 dp->drop_frags = drop_frags;
1388 err = 0;
1389 break;
1390
1391 case ODP_GET_LISTEN_MASK:
1392 err = put_user((int)f->private_data, (int __user *)argp);
1393 break;
1394
1395 case ODP_SET_LISTEN_MASK:
1396 err = get_user(listeners, (int __user *)argp);
1397 if (err)
1398 break;
1399 err = -EINVAL;
1400 if (listeners & ~ODPL_ALL)
1401 break;
1402 err = 0;
1403 f->private_data = (void*)listeners;
1404 break;
1405
1406 case ODP_PORT_QUERY:
1407 err = query_port(dp, (struct odp_port __user *)argp);
1408 break;
1409
1410 case ODP_PORT_LIST:
1411 err = list_ports(dp, (struct odp_portvec __user *)argp);
1412 break;
1413
1414 case ODP_PORT_GROUP_SET:
1415 err = set_port_group(dp, (struct odp_port_group __user *)argp);
1416 break;
1417
1418 case ODP_PORT_GROUP_GET:
1419 err = get_port_group(dp, (struct odp_port_group __user *)argp);
1420 break;
1421
1422 case ODP_FLOW_FLUSH:
1423 err = flush_flows(dp);
1424 break;
1425
1426 case ODP_FLOW_PUT:
1427 err = put_flow(dp, (struct odp_flow_put __user *)argp);
1428 break;
1429
1430 case ODP_FLOW_DEL:
1431 case ODP_FLOW_GET:
1432 err = del_or_query_flow(dp, (struct odp_flow __user *)argp,
1433 cmd);
1434 break;
1435
1436 case ODP_FLOW_GET_MULTIPLE:
1437 err = do_flowvec_ioctl(dp, argp, query_multiple_flows);
1438 break;
1439
1440 case ODP_FLOW_LIST:
1441 err = do_flowvec_ioctl(dp, argp, list_flows);
1442 break;
1443
1444 case ODP_EXECUTE:
1445 err = do_execute(dp, (struct odp_execute __user *)argp);
1446 break;
1447
1448 default:
1449 err = -ENOIOCTLCMD;
1450 break;
1451 }
1452 mutex_unlock(&dp->mutex);
1453 return err;
1454 }
1455
1456 static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
1457 {
1458 int i;
1459 for (i = 0; i < DP_N_QUEUES; i++) {
1460 if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
1461 return 1;
1462 }
1463 return 0;
1464 }
1465
1466 ssize_t openvswitch_read(struct file *f, char __user *buf, size_t nbytes,
1467 loff_t *ppos)
1468 {
1469 /* XXX is there sufficient synchronization here? */
1470 int listeners = (int) f->private_data;
1471 int dp_idx = iminor(f->f_dentry->d_inode);
1472 struct datapath *dp = get_dp(dp_idx);
1473 struct sk_buff *skb;
1474 struct iovec __user iov;
1475 size_t copy_bytes;
1476 int retval;
1477
1478 if (!dp)
1479 return -ENODEV;
1480
1481 if (nbytes == 0 || !listeners)
1482 return 0;
1483
1484 for (;;) {
1485 int i;
1486
1487 for (i = 0; i < DP_N_QUEUES; i++) {
1488 if (listeners & (1 << i)) {
1489 skb = skb_dequeue(&dp->queues[i]);
1490 if (skb)
1491 goto success;
1492 }
1493 }
1494
1495 if (f->f_flags & O_NONBLOCK) {
1496 retval = -EAGAIN;
1497 goto error;
1498 }
1499
1500 wait_event_interruptible(dp->waitqueue,
1501 dp_has_packet_of_interest(dp,
1502 listeners));
1503
1504 if (signal_pending(current)) {
1505 retval = -ERESTARTSYS;
1506 goto error;
1507 }
1508 }
1509 success:
1510 copy_bytes = min(skb->len, nbytes);
1511 iov.iov_base = buf;
1512 iov.iov_len = copy_bytes;
1513 retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
1514 if (!retval)
1515 retval = copy_bytes;
1516 kfree_skb(skb);
1517
1518 error:
1519 return retval;
1520 }
1521
1522 static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
1523 {
1524 /* XXX is there sufficient synchronization here? */
1525 int dp_idx = iminor(file->f_dentry->d_inode);
1526 struct datapath *dp = get_dp(dp_idx);
1527 unsigned int mask;
1528
1529 if (dp) {
1530 mask = 0;
1531 poll_wait(file, &dp->waitqueue, wait);
1532 if (dp_has_packet_of_interest(dp, (int)file->private_data))
1533 mask |= POLLIN | POLLRDNORM;
1534 } else {
1535 mask = POLLIN | POLLRDNORM | POLLHUP;
1536 }
1537 return mask;
1538 }
1539
1540 struct file_operations openvswitch_fops = {
1541 /* XXX .aio_read = openvswitch_aio_read, */
1542 .read = openvswitch_read,
1543 .poll = openvswitch_poll,
1544 .unlocked_ioctl = openvswitch_ioctl,
1545 /* XXX .fasync = openvswitch_fasync, */
1546 };
1547
1548 static int major;
1549 static struct llc_sap *dp_stp_sap;
1550
1551 static int dp_stp_rcv(struct sk_buff *skb, struct net_device *dev,
1552 struct packet_type *pt, struct net_device *orig_dev)
1553 {
1554 /* We don't really care about STP packets, we just listen for them for
1555 * mutual exclusion with the bridge module, so this just discards
1556 * them. */
1557 kfree_skb(skb);
1558 return 0;
1559 }
1560
1561 static int __init dp_init(void)
1562 {
1563 int err;
1564
1565 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
1566
1567 /* Register to receive STP packets because the bridge module also
1568 * attempts to do so. Since there can only be a single listener for a
1569 * given protocol, this provides mutual exclusion against the bridge
1570 * module, preventing both of them from being loaded at the same
1571 * time. */
1572 dp_stp_sap = llc_sap_open(LLC_SAP_BSPAN, dp_stp_rcv);
1573 if (!dp_stp_sap) {
1574 printk(KERN_ERR "openvswitch: can't register sap for STP (probably the bridge module is loaded)\n");
1575 return -EADDRINUSE;
1576 }
1577
1578 err = flow_init();
1579 if (err)
1580 goto error;
1581
1582 err = register_netdevice_notifier(&dp_device_notifier);
1583 if (err)
1584 goto error_flow_exit;
1585
1586 major = register_chrdev(0, "openvswitch", &openvswitch_fops);
1587 if (err < 0)
1588 goto error_unreg_notifier;
1589
1590 /* Hook into callback used by the bridge to intercept packets.
1591 * Parasites we are. */
1592 br_handle_frame_hook = dp_frame_hook;
1593
1594 return 0;
1595
1596 error_unreg_notifier:
1597 unregister_netdevice_notifier(&dp_device_notifier);
1598 error_flow_exit:
1599 flow_exit();
1600 error:
1601 return err;
1602 }
1603
1604 static void dp_cleanup(void)
1605 {
1606 rcu_barrier();
1607 unregister_chrdev(major, "openvswitch");
1608 unregister_netdevice_notifier(&dp_device_notifier);
1609 flow_exit();
1610 br_handle_frame_hook = NULL;
1611 llc_sap_put(dp_stp_sap);
1612 }
1613
1614 module_init(dp_init);
1615 module_exit(dp_cleanup);
1616
1617 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1618 MODULE_LICENSE("GPL");
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