datapath: Simplify send_frags().
[sliver-openvswitch.git] / datapath / datapath.c
1 /*
2  * Copyright (c) 2007, 2008, 2009, 2010, 2011 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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
12
13 #include <linux/init.h>
14 #include <linux/module.h>
15 #include <linux/if_arp.h>
16 #include <linux/if_vlan.h>
17 #include <linux/in.h>
18 #include <linux/ip.h>
19 #include <linux/jhash.h>
20 #include <linux/delay.h>
21 #include <linux/time.h>
22 #include <linux/etherdevice.h>
23 #include <linux/genetlink.h>
24 #include <linux/kernel.h>
25 #include <linux/kthread.h>
26 #include <linux/mutex.h>
27 #include <linux/percpu.h>
28 #include <linux/rcupdate.h>
29 #include <linux/tcp.h>
30 #include <linux/udp.h>
31 #include <linux/version.h>
32 #include <linux/ethtool.h>
33 #include <linux/wait.h>
34 #include <asm/system.h>
35 #include <asm/div64.h>
36 #include <asm/bug.h>
37 #include <linux/highmem.h>
38 #include <linux/netfilter_bridge.h>
39 #include <linux/netfilter_ipv4.h>
40 #include <linux/inetdevice.h>
41 #include <linux/list.h>
42 #include <linux/rculist.h>
43 #include <linux/dmi.h>
44 #include <net/inet_ecn.h>
45 #include <net/genetlink.h>
46
47 #include "openvswitch/datapath-protocol.h"
48 #include "checksum.h"
49 #include "datapath.h"
50 #include "actions.h"
51 #include "flow.h"
52 #include "loop_counter.h"
53 #include "table.h"
54 #include "vlan.h"
55 #include "vport-internal_dev.h"
56
57 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
58 EXPORT_SYMBOL(dp_ioctl_hook);
59
60 /**
61  * DOC: Locking:
62  *
63  * Writes to device state (add/remove datapath, port, set operations on vports,
64  * etc.) are protected by RTNL.
65  *
66  * Writes to other state (flow table modifications, set miscellaneous datapath
67  * parameters such as drop frags, etc.) are protected by genl_mutex.  The RTNL
68  * lock nests inside genl_mutex.
69  *
70  * Reads are protected by RCU.
71  *
72  * There are a few special cases (mostly stats) that have their own
73  * synchronization but they nest under all of above and don't interact with
74  * each other.
75  */
76
77 /* Global list of datapaths to enable dumping them all out.
78  * Protected by genl_mutex.
79  */
80 static LIST_HEAD(dps);
81
82 static struct vport *new_vport(const struct vport_parms *);
83 static int queue_control_packets(struct datapath *, struct sk_buff *,
84                                  const struct dp_upcall_info *);
85
86 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
87 struct datapath *get_dp(int dp_ifindex)
88 {
89         struct datapath *dp = NULL;
90         struct net_device *dev;
91
92         rcu_read_lock();
93         dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
94         if (dev) {
95                 struct vport *vport = internal_dev_get_vport(dev);
96                 if (vport)
97                         dp = vport->dp;
98         }
99         rcu_read_unlock();
100
101         return dp;
102 }
103 EXPORT_SYMBOL_GPL(get_dp);
104
105 /* Must be called with genl_mutex. */
106 static struct tbl *get_table_protected(struct datapath *dp)
107 {
108         return rcu_dereference_protected(dp->table, lockdep_genl_is_held());
109 }
110
111 /* Must be called with rcu_read_lock or RTNL lock. */
112 static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
113 {
114         return rcu_dereference_rtnl(dp->ports[port_no]);
115 }
116
117 /* Must be called with rcu_read_lock or RTNL lock. */
118 const char *dp_name(const struct datapath *dp)
119 {
120         return vport_get_name(rcu_dereference_rtnl(dp->ports[ODPP_LOCAL]));
121 }
122
123 static inline size_t br_nlmsg_size(void)
124 {
125         return NLMSG_ALIGN(sizeof(struct ifinfomsg))
126                + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
127                + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
128                + nla_total_size(4) /* IFLA_MASTER */
129                + nla_total_size(4) /* IFLA_MTU */
130                + nla_total_size(4) /* IFLA_LINK */
131                + nla_total_size(1); /* IFLA_OPERSTATE */
132 }
133
134 /* Caller must hold RTNL lock. */
135 static int dp_fill_ifinfo(struct sk_buff *skb,
136                           const struct vport *port,
137                           int event, unsigned int flags)
138 {
139         struct datapath *dp = port->dp;
140         int ifindex = vport_get_ifindex(port);
141         int iflink = vport_get_iflink(port);
142         struct ifinfomsg *hdr;
143         struct nlmsghdr *nlh;
144
145         if (ifindex < 0)
146                 return ifindex;
147
148         if (iflink < 0)
149                 return iflink;
150
151         nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
152         if (nlh == NULL)
153                 return -EMSGSIZE;
154
155         hdr = nlmsg_data(nlh);
156         hdr->ifi_family = AF_BRIDGE;
157         hdr->__ifi_pad = 0;
158         hdr->ifi_type = ARPHRD_ETHER;
159         hdr->ifi_index = ifindex;
160         hdr->ifi_flags = vport_get_flags(port);
161         hdr->ifi_change = 0;
162
163         NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
164         NLA_PUT_U32(skb, IFLA_MASTER,
165                 vport_get_ifindex(get_vport_protected(dp, ODPP_LOCAL)));
166         NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
167 #ifdef IFLA_OPERSTATE
168         NLA_PUT_U8(skb, IFLA_OPERSTATE,
169                    vport_is_running(port)
170                         ? vport_get_operstate(port)
171                         : IF_OPER_DOWN);
172 #endif
173
174         NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
175
176         if (ifindex != iflink)
177                 NLA_PUT_U32(skb, IFLA_LINK,iflink);
178
179         return nlmsg_end(skb, nlh);
180
181 nla_put_failure:
182         nlmsg_cancel(skb, nlh);
183         return -EMSGSIZE;
184 }
185
186 /* Caller must hold RTNL lock. */
187 static void dp_ifinfo_notify(int event, struct vport *port)
188 {
189         struct sk_buff *skb;
190         int err = -ENOBUFS;
191
192         skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
193         if (skb == NULL)
194                 goto errout;
195
196         err = dp_fill_ifinfo(skb, port, event, 0);
197         if (err < 0) {
198                 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
199                 WARN_ON(err == -EMSGSIZE);
200                 kfree_skb(skb);
201                 goto errout;
202         }
203         rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
204         return;
205 errout:
206         if (err < 0)
207                 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
208 }
209
210 static void release_dp(struct kobject *kobj)
211 {
212         struct datapath *dp = container_of(kobj, struct datapath, ifobj);
213         kfree(dp);
214 }
215
216 static struct kobj_type dp_ktype = {
217         .release = release_dp
218 };
219
220 static void destroy_dp_rcu(struct rcu_head *rcu)
221 {
222         struct datapath *dp = container_of(rcu, struct datapath, rcu);
223
224         tbl_destroy((struct tbl __force *)dp->table, flow_free_tbl);
225         free_percpu(dp->stats_percpu);
226         kobject_put(&dp->ifobj);
227 }
228
229 /* Called with RTNL lock and genl_lock. */
230 static struct vport *new_vport(const struct vport_parms *parms)
231 {
232         struct vport *vport;
233
234         vport = vport_add(parms);
235         if (!IS_ERR(vport)) {
236                 struct datapath *dp = parms->dp;
237
238                 rcu_assign_pointer(dp->ports[parms->port_no], vport);
239                 list_add(&vport->node, &dp->port_list);
240
241                 dp_ifinfo_notify(RTM_NEWLINK, vport);
242         }
243
244         return vport;
245 }
246
247 /* Called with RTNL lock. */
248 int dp_detach_port(struct vport *p)
249 {
250         ASSERT_RTNL();
251
252         if (p->port_no != ODPP_LOCAL)
253                 dp_sysfs_del_if(p);
254         dp_ifinfo_notify(RTM_DELLINK, p);
255
256         /* First drop references to device. */
257         list_del(&p->node);
258         rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
259
260         /* Then destroy it. */
261         return vport_del(p);
262 }
263
264 /* Must be called with rcu_read_lock. */
265 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
266 {
267         struct datapath *dp = p->dp;
268         struct dp_stats_percpu *stats;
269         int stats_counter_off;
270         struct sw_flow_actions *acts;
271         struct loop_counter *loop;
272         int error;
273
274         OVS_CB(skb)->vport = p;
275
276         if (!OVS_CB(skb)->flow) {
277                 struct sw_flow_key key;
278                 struct tbl_node *flow_node;
279                 bool is_frag;
280
281                 /* Extract flow from 'skb' into 'key'. */
282                 error = flow_extract(skb, p->port_no, &key, &is_frag);
283                 if (unlikely(error)) {
284                         kfree_skb(skb);
285                         return;
286                 }
287
288                 if (is_frag && dp->drop_frags) {
289                         kfree_skb(skb);
290                         stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
291                         goto out;
292                 }
293
294                 /* Look up flow. */
295                 flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
296                                         flow_hash(&key), flow_cmp);
297                 if (unlikely(!flow_node)) {
298                         struct dp_upcall_info upcall;
299
300                         upcall.cmd = ODP_PACKET_CMD_MISS;
301                         upcall.key = &key;
302                         upcall.userdata = 0;
303                         upcall.sample_pool = 0;
304                         upcall.actions = NULL;
305                         upcall.actions_len = 0;
306                         dp_upcall(dp, skb, &upcall);
307                         stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
308                         goto out;
309                 }
310
311                 OVS_CB(skb)->flow = flow_cast(flow_node);
312         }
313
314         stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
315         flow_used(OVS_CB(skb)->flow, skb);
316
317         acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
318
319         /* Check whether we've looped too much. */
320         loop = loop_get_counter();
321         if (unlikely(++loop->count > MAX_LOOPS))
322                 loop->looping = true;
323         if (unlikely(loop->looping)) {
324                 loop_suppress(dp, acts);
325                 kfree_skb(skb);
326                 goto out_loop;
327         }
328
329         /* Execute actions. */
330         execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
331                         acts->actions_len);
332
333         /* Check whether sub-actions looped too much. */
334         if (unlikely(loop->looping))
335                 loop_suppress(dp, acts);
336
337 out_loop:
338         /* Decrement loop counter. */
339         if (!--loop->count)
340                 loop->looping = false;
341         loop_put_counter();
342
343 out:
344         /* Update datapath statistics. */
345         local_bh_disable();
346         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
347
348         write_seqcount_begin(&stats->seqlock);
349         (*(u64 *)((u8 *)stats + stats_counter_off))++;
350         write_seqcount_end(&stats->seqlock);
351
352         local_bh_enable();
353 }
354
355 static void copy_and_csum_skb(struct sk_buff *skb, void *to)
356 {
357         u16 csum_start, csum_offset;
358         __wsum csum;
359
360         get_skb_csum_pointers(skb, &csum_start, &csum_offset);
361         csum_start -= skb_headroom(skb);
362         BUG_ON(csum_start >= skb_headlen(skb));
363
364         skb_copy_bits(skb, 0, to, csum_start);
365
366         csum = skb_copy_and_csum_bits(skb, csum_start, to + csum_start,
367                                       skb->len - csum_start, 0);
368         *(__sum16 *)(to + csum_start + csum_offset) = csum_fold(csum);
369 }
370
371 static struct genl_family dp_packet_genl_family = {
372         .id = GENL_ID_GENERATE,
373         .hdrsize = sizeof(struct odp_header),
374         .name = ODP_PACKET_FAMILY,
375         .version = 1,
376         .maxattr = ODP_PACKET_ATTR_MAX
377 };
378
379 /* Generic Netlink multicast groups for upcalls.
380  *
381  * We really want three unique multicast groups per datapath, but we can't even
382  * get one, because genl_register_mc_group() takes genl_lock, which is also
383  * held during Generic Netlink message processing, so trying to acquire
384  * multicast groups during ODP_DP_NEW processing deadlocks.  Instead, we
385  * preallocate a few groups and use them round-robin for datapaths.  Collision
386  * isn't fatal--multicast listeners should check that the family is the one
387  * that they want and discard others--but it wastes time and memory to receive
388  * unwanted messages.
389  */
390 #define PACKET_N_MC_GROUPS 16
391 static struct genl_multicast_group packet_mc_groups[PACKET_N_MC_GROUPS];
392
393 static u32 packet_mc_group(struct datapath *dp, u8 cmd)
394 {
395         u32 idx;
396         BUILD_BUG_ON_NOT_POWER_OF_2(PACKET_N_MC_GROUPS);
397
398         idx = jhash_2words(dp->dp_ifindex, cmd, 0) & (PACKET_N_MC_GROUPS - 1);
399         return packet_mc_groups[idx].id;
400 }
401
402 static int packet_register_mc_groups(void)
403 {
404         int i;
405
406         for (i = 0; i < PACKET_N_MC_GROUPS; i++) {
407                 struct genl_multicast_group *group = &packet_mc_groups[i];
408                 int error;
409
410                 sprintf(group->name, "packet%d", i);
411                 error = genl_register_mc_group(&dp_packet_genl_family, group);
412                 if (error)
413                         return error;
414         }
415         return 0;
416 }
417
418 int dp_upcall(struct datapath *dp, struct sk_buff *skb, const struct dp_upcall_info *upcall_info)
419 {
420         struct dp_stats_percpu *stats;
421         int err;
422
423         WARN_ON_ONCE(skb_shared(skb));
424
425         forward_ip_summed(skb);
426
427         err = vswitch_skb_checksum_setup(skb);
428         if (err)
429                 goto err_kfree_skb;
430
431         /* Break apart GSO packets into their component pieces.  Otherwise
432          * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
433         if (skb_is_gso(skb)) {
434                 struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
435                 
436                 kfree_skb(skb);
437                 skb = nskb;
438                 if (IS_ERR(skb)) {
439                         err = PTR_ERR(skb);
440                         goto err;
441                 }
442         }
443
444         return queue_control_packets(dp, skb, upcall_info);
445
446 err_kfree_skb:
447         kfree_skb(skb);
448 err:
449         local_bh_disable();
450         stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
451
452         write_seqcount_begin(&stats->seqlock);
453         stats->n_lost++;
454         write_seqcount_end(&stats->seqlock);
455
456         local_bh_enable();
457
458         return err;
459 }
460
461 /* Send each packet in the 'skb' list to userspace for 'dp' as directed by
462  * 'upcall_info'.  There will be only one packet unless we broke up a GSO
463  * packet.
464  */
465 static int queue_control_packets(struct datapath *dp, struct sk_buff *skb,
466                                  const struct dp_upcall_info *upcall_info)
467 {
468         u32 group = packet_mc_group(dp, upcall_info->cmd);
469         struct sk_buff *nskb;
470         int port_no;
471         int err;
472
473         if (OVS_CB(skb)->vport)
474                 port_no = OVS_CB(skb)->vport->port_no;
475         else
476                 port_no = ODPP_LOCAL;
477
478         do {
479                 struct odp_header *upcall;
480                 struct sk_buff *user_skb; /* to be queued to userspace */
481                 struct nlattr *nla;
482                 unsigned int len;
483
484                 nskb = skb->next;
485                 skb->next = NULL;
486
487                 err = vlan_deaccel_tag(skb);
488                 if (unlikely(err))
489                         goto err_kfree_skbs;
490
491                 len = sizeof(struct odp_header);
492                 len += nla_total_size(skb->len);
493                 len += nla_total_size(FLOW_BUFSIZE);
494                 if (upcall_info->userdata)
495                         len += nla_total_size(8);
496                 if (upcall_info->sample_pool)
497                         len += nla_total_size(4);
498                 if (upcall_info->actions_len)
499                         len += nla_total_size(upcall_info->actions_len);
500
501                 user_skb = genlmsg_new(len, GFP_ATOMIC);
502                 if (!user_skb) {
503                         netlink_set_err(INIT_NET_GENL_SOCK, 0, group, -ENOBUFS);
504                         goto err_kfree_skbs;
505                 }
506
507                 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, 0, upcall_info->cmd);
508                 upcall->dp_ifindex = dp->dp_ifindex;
509
510                 nla = nla_nest_start(user_skb, ODP_PACKET_ATTR_KEY);
511                 flow_to_nlattrs(upcall_info->key, user_skb);
512                 nla_nest_end(user_skb, nla);
513
514                 if (upcall_info->userdata)
515                         nla_put_u64(user_skb, ODP_PACKET_ATTR_USERDATA, upcall_info->userdata);
516                 if (upcall_info->sample_pool)
517                         nla_put_u32(user_skb, ODP_PACKET_ATTR_SAMPLE_POOL, upcall_info->sample_pool);
518                 if (upcall_info->actions_len) {
519                         const struct nlattr *actions = upcall_info->actions;
520                         u32 actions_len = upcall_info->actions_len;
521
522                         nla = nla_nest_start(user_skb, ODP_PACKET_ATTR_ACTIONS);
523                         memcpy(__skb_put(user_skb, actions_len), actions, actions_len);
524                         nla_nest_end(user_skb, nla);
525                 }
526
527                 nla = __nla_reserve(user_skb, ODP_PACKET_ATTR_PACKET, skb->len);
528                 if (skb->ip_summed == CHECKSUM_PARTIAL)
529                         copy_and_csum_skb(skb, nla_data(nla));
530                 else
531                         skb_copy_bits(skb, 0, nla_data(nla), skb->len);
532
533                 err = genlmsg_multicast(user_skb, 0, group, GFP_ATOMIC);
534                 if (err)
535                         goto err_kfree_skbs;
536
537                 kfree_skb(skb);
538                 skb = nskb;
539         } while (skb);
540         return 0;
541
542 err_kfree_skbs:
543         kfree_skb(skb);
544         while ((skb = nskb) != NULL) {
545                 nskb = skb->next;
546                 kfree_skb(skb);
547         }
548         return err;
549 }
550
551 /* Called with genl_mutex. */
552 static int flush_flows(int dp_ifindex)
553 {
554         struct tbl *old_table;
555         struct tbl *new_table;
556         struct datapath *dp;
557
558         dp = get_dp(dp_ifindex);
559         if (!dp)
560                 return -ENODEV;
561
562         old_table = get_table_protected(dp);
563         new_table = tbl_create(TBL_MIN_BUCKETS);
564         if (!new_table)
565                 return -ENOMEM;
566
567         rcu_assign_pointer(dp->table, new_table);
568
569         tbl_deferred_destroy(old_table, flow_free_tbl);
570
571         return 0;
572 }
573
574 static int validate_actions(const struct nlattr *attr)
575 {
576         const struct nlattr *a;
577         int rem;
578
579         nla_for_each_nested(a, attr, rem) {
580                 static const u32 action_lens[ODP_ACTION_ATTR_MAX + 1] = {
581                         [ODP_ACTION_ATTR_OUTPUT] = 4,
582                         [ODP_ACTION_ATTR_CONTROLLER] = 8,
583                         [ODP_ACTION_ATTR_SET_DL_TCI] = 2,
584                         [ODP_ACTION_ATTR_STRIP_VLAN] = 0,
585                         [ODP_ACTION_ATTR_SET_DL_SRC] = ETH_ALEN,
586                         [ODP_ACTION_ATTR_SET_DL_DST] = ETH_ALEN,
587                         [ODP_ACTION_ATTR_SET_NW_SRC] = 4,
588                         [ODP_ACTION_ATTR_SET_NW_DST] = 4,
589                         [ODP_ACTION_ATTR_SET_NW_TOS] = 1,
590                         [ODP_ACTION_ATTR_SET_TP_SRC] = 2,
591                         [ODP_ACTION_ATTR_SET_TP_DST] = 2,
592                         [ODP_ACTION_ATTR_SET_TUNNEL] = 8,
593                         [ODP_ACTION_ATTR_SET_PRIORITY] = 4,
594                         [ODP_ACTION_ATTR_POP_PRIORITY] = 0,
595                         [ODP_ACTION_ATTR_DROP_SPOOFED_ARP] = 0,
596                 };
597                 int type = nla_type(a);
598
599                 if (type > ODP_ACTION_ATTR_MAX || nla_len(a) != action_lens[type])
600                         return -EINVAL;
601
602                 switch (type) {
603                 case ODP_ACTION_ATTR_UNSPEC:
604                         return -EINVAL;
605
606                 case ODP_ACTION_ATTR_CONTROLLER:
607                 case ODP_ACTION_ATTR_STRIP_VLAN:
608                 case ODP_ACTION_ATTR_SET_DL_SRC:
609                 case ODP_ACTION_ATTR_SET_DL_DST:
610                 case ODP_ACTION_ATTR_SET_NW_SRC:
611                 case ODP_ACTION_ATTR_SET_NW_DST:
612                 case ODP_ACTION_ATTR_SET_TP_SRC:
613                 case ODP_ACTION_ATTR_SET_TP_DST:
614                 case ODP_ACTION_ATTR_SET_TUNNEL:
615                 case ODP_ACTION_ATTR_SET_PRIORITY:
616                 case ODP_ACTION_ATTR_POP_PRIORITY:
617                 case ODP_ACTION_ATTR_DROP_SPOOFED_ARP:
618                         /* No validation needed. */
619                         break;
620
621                 case ODP_ACTION_ATTR_OUTPUT:
622                         if (nla_get_u32(a) >= DP_MAX_PORTS)
623                                 return -EINVAL;
624                         break;
625
626                 case ODP_ACTION_ATTR_SET_DL_TCI:
627                         if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
628                                 return -EINVAL;
629                         break;
630
631                 case ODP_ACTION_ATTR_SET_NW_TOS:
632                         if (nla_get_u8(a) & INET_ECN_MASK)
633                                 return -EINVAL;
634                         break;
635
636                 default:
637                         return -EOPNOTSUPP;
638                 }
639         }
640
641         if (rem > 0)
642                 return -EINVAL;
643
644         return 0;
645 }
646 static void clear_stats(struct sw_flow *flow)
647 {
648         flow->used = 0;
649         flow->tcp_flags = 0;
650         flow->packet_count = 0;
651         flow->byte_count = 0;
652 }
653
654 /* Called with genl_mutex. */
655 static int expand_table(struct datapath *dp)
656 {
657         struct tbl *old_table = get_table_protected(dp);
658         struct tbl *new_table;
659
660         new_table = tbl_expand(old_table);
661         if (IS_ERR(new_table))
662                 return PTR_ERR(new_table);
663
664         rcu_assign_pointer(dp->table, new_table);
665         tbl_deferred_destroy(old_table, NULL);
666
667         return 0;
668 }
669
670 static int odp_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
671 {
672         struct odp_header *odp_header = info->userhdr;
673         struct nlattr **a = info->attrs;
674         struct sk_buff *packet;
675         struct sw_flow_key key;
676         struct datapath *dp;
677         struct ethhdr *eth;
678         bool is_frag;
679         int err;
680
681         err = -EINVAL;
682         if (!a[ODP_PACKET_ATTR_PACKET] || !a[ODP_PACKET_ATTR_ACTIONS] ||
683             nla_len(a[ODP_PACKET_ATTR_PACKET]) < ETH_HLEN)
684                 goto exit;
685
686         err = validate_actions(a[ODP_PACKET_ATTR_ACTIONS]);
687         if (err)
688                 goto exit;
689
690         packet = skb_clone(skb, GFP_KERNEL);
691         err = -ENOMEM;
692         if (!packet)
693                 goto exit;
694         packet->data = nla_data(a[ODP_PACKET_ATTR_PACKET]);
695         packet->len = nla_len(a[ODP_PACKET_ATTR_PACKET]);
696
697         skb_reset_mac_header(packet);
698         eth = eth_hdr(packet);
699
700         /* Normally, setting the skb 'protocol' field would be handled by a
701          * call to eth_type_trans(), but it assumes there's a sending
702          * device, which we may not have. */
703         if (ntohs(eth->h_proto) >= 1536)
704                 packet->protocol = eth->h_proto;
705         else
706                 packet->protocol = htons(ETH_P_802_2);
707
708         err = flow_extract(packet, -1, &key, &is_frag);
709         if (err)
710                 goto exit;
711
712         /* Initialize OVS_CB (it came from Netlink so might not be zeroed). */
713         memset(OVS_CB(packet), 0, sizeof(struct ovs_skb_cb));
714
715         rcu_read_lock();
716         dp = get_dp(odp_header->dp_ifindex);
717         err = -ENODEV;
718         if (dp)
719                 err = execute_actions(dp, packet, &key,
720                                       nla_data(a[ODP_PACKET_ATTR_ACTIONS]),
721                                       nla_len(a[ODP_PACKET_ATTR_ACTIONS]));
722         rcu_read_unlock();
723
724 exit:
725         return err;
726 }
727
728 static const struct nla_policy packet_policy[ODP_PACKET_ATTR_MAX + 1] = {
729         [ODP_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
730         [ODP_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
731 };
732
733 static struct genl_ops dp_packet_genl_ops[] = {
734         { .cmd = ODP_PACKET_CMD_EXECUTE,
735           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
736           .policy = packet_policy,
737           .doit = odp_packet_cmd_execute
738         }
739 };
740
741 static void get_dp_stats(struct datapath *dp, struct odp_stats *stats)
742 {
743         int i;
744
745         stats->n_frags = stats->n_hit = stats->n_missed = stats->n_lost = 0;
746         for_each_possible_cpu(i) {
747                 const struct dp_stats_percpu *percpu_stats;
748                 struct dp_stats_percpu local_stats;
749                 unsigned seqcount;
750
751                 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
752
753                 do {
754                         seqcount = read_seqcount_begin(&percpu_stats->seqlock);
755                         local_stats = *percpu_stats;
756                 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
757
758                 stats->n_frags += local_stats.n_frags;
759                 stats->n_hit += local_stats.n_hit;
760                 stats->n_missed += local_stats.n_missed;
761                 stats->n_lost += local_stats.n_lost;
762         }
763 }
764
765 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports.
766  * Called with RTNL lock.
767  */
768 int dp_min_mtu(const struct datapath *dp)
769 {
770         struct vport *p;
771         int mtu = 0;
772
773         ASSERT_RTNL();
774
775         list_for_each_entry (p, &dp->port_list, node) {
776                 int dev_mtu;
777
778                 /* Skip any internal ports, since that's what we're trying to
779                  * set. */
780                 if (is_internal_vport(p))
781                         continue;
782
783                 dev_mtu = vport_get_mtu(p);
784                 if (!dev_mtu)
785                         continue;
786                 if (!mtu || dev_mtu < mtu)
787                         mtu = dev_mtu;
788         }
789
790         return mtu ? mtu : ETH_DATA_LEN;
791 }
792
793 /* Sets the MTU of all datapath devices to the minimum of the ports
794  * Called with RTNL lock.
795  */
796 void set_internal_devs_mtu(const struct datapath *dp)
797 {
798         struct vport *p;
799         int mtu;
800
801         ASSERT_RTNL();
802
803         mtu = dp_min_mtu(dp);
804
805         list_for_each_entry (p, &dp->port_list, node) {
806                 if (is_internal_vport(p))
807                         vport_set_mtu(p, mtu);
808         }
809 }
810
811 static const struct nla_policy flow_policy[ODP_FLOW_ATTR_MAX + 1] = {
812         [ODP_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
813         [ODP_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
814         [ODP_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
815 };
816
817 static struct genl_family dp_flow_genl_family = {
818         .id = GENL_ID_GENERATE,
819         .hdrsize = sizeof(struct odp_header),
820         .name = ODP_FLOW_FAMILY,
821         .version = 1,
822         .maxattr = ODP_FLOW_ATTR_MAX
823 };
824
825 static struct genl_multicast_group dp_flow_multicast_group = {
826         .name = ODP_FLOW_MCGROUP
827 };
828
829 /* Called with genl_lock. */
830 static int odp_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
831                                   struct sk_buff *skb, u32 pid, u32 seq, u32 flags, u8 cmd)
832 {
833         const int skb_orig_len = skb->len;
834         const struct sw_flow_actions *sf_acts;
835         struct odp_flow_stats stats;
836         struct odp_header *odp_header;
837         struct nlattr *nla;
838         unsigned long used;
839         u8 tcp_flags;
840         int err;
841
842         sf_acts = rcu_dereference_protected(flow->sf_acts,
843                                             lockdep_genl_is_held());
844
845         odp_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
846         if (!odp_header)
847                 return -EMSGSIZE;
848
849         odp_header->dp_ifindex = dp->dp_ifindex;
850
851         nla = nla_nest_start(skb, ODP_FLOW_ATTR_KEY);
852         if (!nla)
853                 goto nla_put_failure;
854         err = flow_to_nlattrs(&flow->key, skb);
855         if (err)
856                 goto error;
857         nla_nest_end(skb, nla);
858
859         spin_lock_bh(&flow->lock);
860         used = flow->used;
861         stats.n_packets = flow->packet_count;
862         stats.n_bytes = flow->byte_count;
863         tcp_flags = flow->tcp_flags;
864         spin_unlock_bh(&flow->lock);
865
866         if (used)
867                 NLA_PUT_U64(skb, ODP_FLOW_ATTR_USED, flow_used_time(used));
868
869         if (stats.n_packets)
870                 NLA_PUT(skb, ODP_FLOW_ATTR_STATS, sizeof(struct odp_flow_stats), &stats);
871
872         if (tcp_flags)
873                 NLA_PUT_U8(skb, ODP_FLOW_ATTR_TCP_FLAGS, tcp_flags);
874
875         /* If ODP_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
876          * this is the first flow to be dumped into 'skb'.  This is unusual for
877          * Netlink but individual action lists can be longer than
878          * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
879          * The userspace caller can always fetch the actions separately if it
880          * really wants them.  (Most userspace callers in fact don't care.)
881          *
882          * This can only fail for dump operations because the skb is always
883          * properly sized for single flows.
884          */
885         err = nla_put(skb, ODP_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
886                       sf_acts->actions);
887         if (err < 0 && skb_orig_len)
888                 goto error;
889
890         return genlmsg_end(skb, odp_header);
891
892 nla_put_failure:
893         err = -EMSGSIZE;
894 error:
895         genlmsg_cancel(skb, odp_header);
896         return err;
897 }
898
899 static struct sk_buff *odp_flow_cmd_alloc_info(struct sw_flow *flow)
900 {
901         const struct sw_flow_actions *sf_acts;
902         int len;
903
904         sf_acts = rcu_dereference_protected(flow->sf_acts,
905                                             lockdep_genl_is_held());
906
907         len = nla_total_size(FLOW_BUFSIZE); /* ODP_FLOW_ATTR_KEY */
908         len += nla_total_size(sf_acts->actions_len); /* ODP_FLOW_ATTR_ACTIONS */
909         len += nla_total_size(sizeof(struct odp_flow_stats)); /* ODP_FLOW_ATTR_STATS */
910         len += nla_total_size(1); /* ODP_FLOW_ATTR_TCP_FLAGS */
911         len += nla_total_size(8); /* ODP_FLOW_ATTR_USED */
912         return genlmsg_new(NLMSG_ALIGN(sizeof(struct odp_header)) + len, GFP_KERNEL);
913 }
914
915 static struct sk_buff *odp_flow_cmd_build_info(struct sw_flow *flow, struct datapath *dp,
916                                                u32 pid, u32 seq, u8 cmd)
917 {
918         struct sk_buff *skb;
919         int retval;
920
921         skb = odp_flow_cmd_alloc_info(flow);
922         if (!skb)
923                 return ERR_PTR(-ENOMEM);
924
925         retval = odp_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
926         BUG_ON(retval < 0);
927         return skb;
928 }
929
930 static int odp_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
931 {
932         struct nlattr **a = info->attrs;
933         struct odp_header *odp_header = info->userhdr;
934         struct tbl_node *flow_node;
935         struct sw_flow_key key;
936         struct sw_flow *flow;
937         struct sk_buff *reply;
938         struct datapath *dp;
939         struct tbl *table;
940         u32 hash;
941         int error;
942
943         /* Extract key. */
944         error = -EINVAL;
945         if (!a[ODP_FLOW_ATTR_KEY])
946                 goto error;
947         error = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
948         if (error)
949                 goto error;
950
951         /* Validate actions. */
952         if (a[ODP_FLOW_ATTR_ACTIONS]) {
953                 error = validate_actions(a[ODP_FLOW_ATTR_ACTIONS]);
954                 if (error)
955                         goto error;
956         } else if (info->genlhdr->cmd == ODP_FLOW_CMD_NEW) {
957                 error = -EINVAL;
958                 goto error;
959         }
960
961         dp = get_dp(odp_header->dp_ifindex);
962         error = -ENODEV;
963         if (!dp)
964                 goto error;
965
966         hash = flow_hash(&key);
967         table = get_table_protected(dp);
968         flow_node = tbl_lookup(table, &key, hash, flow_cmp);
969         if (!flow_node) {
970                 struct sw_flow_actions *acts;
971
972                 /* Bail out if we're not allowed to create a new flow. */
973                 error = -ENOENT;
974                 if (info->genlhdr->cmd == ODP_FLOW_CMD_SET)
975                         goto error;
976
977                 /* Expand table, if necessary, to make room. */
978                 if (tbl_count(table) >= tbl_n_buckets(table)) {
979                         error = expand_table(dp);
980                         if (error)
981                                 goto error;
982                         table = get_table_protected(dp);
983                 }
984
985                 /* Allocate flow. */
986                 flow = flow_alloc();
987                 if (IS_ERR(flow)) {
988                         error = PTR_ERR(flow);
989                         goto error;
990                 }
991                 flow->key = key;
992                 clear_stats(flow);
993
994                 /* Obtain actions. */
995                 acts = flow_actions_alloc(a[ODP_FLOW_ATTR_ACTIONS]);
996                 error = PTR_ERR(acts);
997                 if (IS_ERR(acts))
998                         goto error_free_flow;
999                 rcu_assign_pointer(flow->sf_acts, acts);
1000
1001                 /* Put flow in bucket. */
1002                 error = tbl_insert(table, &flow->tbl_node, hash);
1003                 if (error)
1004                         goto error_free_flow;
1005
1006                 reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid,
1007                                                 info->snd_seq, ODP_FLOW_CMD_NEW);
1008         } else {
1009                 /* We found a matching flow. */
1010                 struct sw_flow_actions *old_acts;
1011
1012                 /* Bail out if we're not allowed to modify an existing flow.
1013                  * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1014                  * because Generic Netlink treats the latter as a dump
1015                  * request.  We also accept NLM_F_EXCL in case that bug ever
1016                  * gets fixed.
1017                  */
1018                 error = -EEXIST;
1019                 if (info->genlhdr->cmd == ODP_FLOW_CMD_NEW &&
1020                     info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1021                         goto error;
1022
1023                 /* Update actions. */
1024                 flow = flow_cast(flow_node);
1025                 old_acts = rcu_dereference_protected(flow->sf_acts,
1026                                                      lockdep_genl_is_held());
1027                 if (a[ODP_FLOW_ATTR_ACTIONS] &&
1028                     (old_acts->actions_len != nla_len(a[ODP_FLOW_ATTR_ACTIONS]) ||
1029                      memcmp(old_acts->actions, nla_data(a[ODP_FLOW_ATTR_ACTIONS]),
1030                             old_acts->actions_len))) {
1031                         struct sw_flow_actions *new_acts;
1032
1033                         new_acts = flow_actions_alloc(a[ODP_FLOW_ATTR_ACTIONS]);
1034                         error = PTR_ERR(new_acts);
1035                         if (IS_ERR(new_acts))
1036                                 goto error;
1037
1038                         rcu_assign_pointer(flow->sf_acts, new_acts);
1039                         flow_deferred_free_acts(old_acts);
1040                 }
1041
1042                 reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid,
1043                                                 info->snd_seq, ODP_FLOW_CMD_NEW);
1044
1045                 /* Clear stats. */
1046                 if (a[ODP_FLOW_ATTR_CLEAR]) {
1047                         spin_lock_bh(&flow->lock);
1048                         clear_stats(flow);
1049                         spin_unlock_bh(&flow->lock);
1050                 }
1051         }
1052
1053         if (!IS_ERR(reply))
1054                 genl_notify(reply, genl_info_net(info), info->snd_pid,
1055                             dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1056         else
1057                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1058                                 dp_flow_multicast_group.id, PTR_ERR(reply));
1059         return 0;
1060
1061 error_free_flow:
1062         flow_put(flow);
1063 error:
1064         return error;
1065 }
1066
1067 static int odp_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1068 {
1069         struct nlattr **a = info->attrs;
1070         struct odp_header *odp_header = info->userhdr;
1071         struct sw_flow_key key;
1072         struct tbl_node *flow_node;
1073         struct sk_buff *reply;
1074         struct sw_flow *flow;
1075         struct datapath *dp;
1076         struct tbl *table;
1077         int err;
1078
1079         if (!a[ODP_FLOW_ATTR_KEY])
1080                 return -EINVAL;
1081         err = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
1082         if (err)
1083                 return err;
1084
1085         dp = get_dp(odp_header->dp_ifindex);
1086         if (!dp)
1087                 return -ENODEV;
1088
1089         table = get_table_protected(dp);
1090         flow_node = tbl_lookup(table, &key, flow_hash(&key), flow_cmp);
1091         if (!flow_node)
1092                 return -ENOENT;
1093
1094         flow = flow_cast(flow_node);
1095         reply = odp_flow_cmd_build_info(flow, dp, info->snd_pid, info->snd_seq, ODP_FLOW_CMD_NEW);
1096         if (IS_ERR(reply))
1097                 return PTR_ERR(reply);
1098
1099         return genlmsg_reply(reply, info);
1100 }
1101
1102 static int odp_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1103 {
1104         struct nlattr **a = info->attrs;
1105         struct odp_header *odp_header = info->userhdr;
1106         struct sw_flow_key key;
1107         struct tbl_node *flow_node;
1108         struct sk_buff *reply;
1109         struct sw_flow *flow;
1110         struct datapath *dp;
1111         struct tbl *table;
1112         int err;
1113
1114         if (!a[ODP_FLOW_ATTR_KEY])
1115                 return flush_flows(odp_header->dp_ifindex);
1116         err = flow_from_nlattrs(&key, a[ODP_FLOW_ATTR_KEY]);
1117         if (err)
1118                 return err;
1119
1120         dp = get_dp(odp_header->dp_ifindex);
1121         if (!dp)
1122                 return -ENODEV;
1123
1124         table = get_table_protected(dp);
1125         flow_node = tbl_lookup(table, &key, flow_hash(&key), flow_cmp);
1126         if (!flow_node)
1127                 return -ENOENT;
1128         flow = flow_cast(flow_node);
1129
1130         reply = odp_flow_cmd_alloc_info(flow);
1131         if (!reply)
1132                 return -ENOMEM;
1133
1134         err = tbl_remove(table, flow_node);
1135         if (err) {
1136                 kfree_skb(reply);
1137                 return err;
1138         }
1139
1140         err = odp_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1141                                      info->snd_seq, 0, ODP_FLOW_CMD_DEL);
1142         BUG_ON(err < 0);
1143
1144         flow_deferred_free(flow);
1145
1146         genl_notify(reply, genl_info_net(info), info->snd_pid,
1147                     dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1148         return 0;
1149 }
1150
1151 static int odp_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1152 {
1153         struct odp_header *odp_header = genlmsg_data(nlmsg_data(cb->nlh));
1154         struct datapath *dp;
1155
1156         dp = get_dp(odp_header->dp_ifindex);
1157         if (!dp)
1158                 return -ENODEV;
1159
1160         for (;;) {
1161                 struct tbl_node *flow_node;
1162                 struct sw_flow *flow;
1163                 u32 bucket, obj;
1164
1165                 bucket = cb->args[0];
1166                 obj = cb->args[1];
1167                 flow_node = tbl_next(get_table_protected(dp), &bucket, &obj);
1168                 if (!flow_node)
1169                         break;
1170
1171                 flow = flow_cast(flow_node);
1172                 if (odp_flow_cmd_fill_info(flow, dp, skb, NETLINK_CB(cb->skb).pid,
1173                                            cb->nlh->nlmsg_seq, NLM_F_MULTI,
1174                                            ODP_FLOW_CMD_NEW) < 0)
1175                         break;
1176
1177                 cb->args[0] = bucket;
1178                 cb->args[1] = obj;
1179         }
1180         return skb->len;
1181 }
1182
1183 static struct genl_ops dp_flow_genl_ops[] = {
1184         { .cmd = ODP_FLOW_CMD_NEW,
1185           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1186           .policy = flow_policy,
1187           .doit = odp_flow_cmd_new_or_set
1188         },
1189         { .cmd = ODP_FLOW_CMD_DEL,
1190           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1191           .policy = flow_policy,
1192           .doit = odp_flow_cmd_del
1193         },
1194         { .cmd = ODP_FLOW_CMD_GET,
1195           .flags = 0,               /* OK for unprivileged users. */
1196           .policy = flow_policy,
1197           .doit = odp_flow_cmd_get,
1198           .dumpit = odp_flow_cmd_dump
1199         },
1200         { .cmd = ODP_FLOW_CMD_SET,
1201           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1202           .policy = flow_policy,
1203           .doit = odp_flow_cmd_new_or_set,
1204         },
1205 };
1206
1207 static const struct nla_policy datapath_policy[ODP_DP_ATTR_MAX + 1] = {
1208 #ifdef HAVE_NLA_NUL_STRING
1209         [ODP_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1210 #endif
1211         [ODP_DP_ATTR_IPV4_FRAGS] = { .type = NLA_U32 },
1212         [ODP_DP_ATTR_SAMPLING] = { .type = NLA_U32 },
1213 };
1214
1215 static struct genl_family dp_datapath_genl_family = {
1216         .id = GENL_ID_GENERATE,
1217         .hdrsize = sizeof(struct odp_header),
1218         .name = ODP_DATAPATH_FAMILY,
1219         .version = 1,
1220         .maxattr = ODP_DP_ATTR_MAX
1221 };
1222
1223 static struct genl_multicast_group dp_datapath_multicast_group = {
1224         .name = ODP_DATAPATH_MCGROUP
1225 };
1226
1227 static int odp_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1228                                 u32 pid, u32 seq, u32 flags, u8 cmd)
1229 {
1230         struct odp_header *odp_header;
1231         struct nlattr *nla;
1232         int err;
1233
1234         odp_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1235                                    flags, cmd);
1236         if (!odp_header)
1237                 goto error;
1238
1239         odp_header->dp_ifindex = dp->dp_ifindex;
1240
1241         rcu_read_lock();
1242         err = nla_put_string(skb, ODP_DP_ATTR_NAME, dp_name(dp));
1243         rcu_read_unlock();
1244         if (err)
1245                 goto nla_put_failure;
1246
1247         nla = nla_reserve(skb, ODP_DP_ATTR_STATS, sizeof(struct odp_stats));
1248         if (!nla)
1249                 goto nla_put_failure;
1250         get_dp_stats(dp, nla_data(nla));
1251
1252         NLA_PUT_U32(skb, ODP_DP_ATTR_IPV4_FRAGS,
1253                     dp->drop_frags ? ODP_DP_FRAG_DROP : ODP_DP_FRAG_ZERO);
1254
1255         if (dp->sflow_probability)
1256                 NLA_PUT_U32(skb, ODP_DP_ATTR_SAMPLING, dp->sflow_probability);
1257
1258         nla = nla_nest_start(skb, ODP_DP_ATTR_MCGROUPS);
1259         if (!nla)
1260                 goto nla_put_failure;
1261         NLA_PUT_U32(skb, ODP_PACKET_CMD_MISS, packet_mc_group(dp, ODP_PACKET_CMD_MISS));
1262         NLA_PUT_U32(skb, ODP_PACKET_CMD_ACTION, packet_mc_group(dp, ODP_PACKET_CMD_ACTION));
1263         NLA_PUT_U32(skb, ODP_PACKET_CMD_SAMPLE, packet_mc_group(dp, ODP_PACKET_CMD_SAMPLE));
1264         nla_nest_end(skb, nla);
1265
1266         return genlmsg_end(skb, odp_header);
1267
1268 nla_put_failure:
1269         genlmsg_cancel(skb, odp_header);
1270 error:
1271         return -EMSGSIZE;
1272 }
1273
1274 static struct sk_buff *odp_dp_cmd_build_info(struct datapath *dp, u32 pid,
1275                                              u32 seq, u8 cmd)
1276 {
1277         struct sk_buff *skb;
1278         int retval;
1279
1280         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1281         if (!skb)
1282                 return ERR_PTR(-ENOMEM);
1283
1284         retval = odp_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1285         if (retval < 0) {
1286                 kfree_skb(skb);
1287                 return ERR_PTR(retval);
1288         }
1289         return skb;
1290 }
1291
1292 static int odp_dp_cmd_validate(struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1293 {
1294         if (a[ODP_DP_ATTR_IPV4_FRAGS]) {
1295                 u32 frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]);
1296
1297                 if (frags != ODP_DP_FRAG_ZERO && frags != ODP_DP_FRAG_DROP)
1298                         return -EINVAL;
1299         }
1300
1301         return VERIFY_NUL_STRING(a[ODP_DP_ATTR_NAME], IFNAMSIZ - 1);
1302 }
1303
1304 /* Called with genl_mutex and optionally with RTNL lock also. */
1305 static struct datapath *lookup_datapath(struct odp_header *odp_header, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1306 {
1307         struct datapath *dp;
1308
1309         if (!a[ODP_DP_ATTR_NAME])
1310                 dp = get_dp(odp_header->dp_ifindex);
1311         else {
1312                 struct vport *vport;
1313
1314                 rcu_read_lock();
1315                 vport = vport_locate(nla_data(a[ODP_DP_ATTR_NAME]));
1316                 dp = vport && vport->port_no == ODPP_LOCAL ? vport->dp : NULL;
1317                 rcu_read_unlock();
1318         }
1319         return dp ? dp : ERR_PTR(-ENODEV);
1320 }
1321
1322 /* Called with genl_mutex. */
1323 static void change_datapath(struct datapath *dp, struct nlattr *a[ODP_DP_ATTR_MAX + 1])
1324 {
1325         if (a[ODP_DP_ATTR_IPV4_FRAGS])
1326                 dp->drop_frags = nla_get_u32(a[ODP_DP_ATTR_IPV4_FRAGS]) == ODP_DP_FRAG_DROP;
1327         if (a[ODP_DP_ATTR_SAMPLING])
1328                 dp->sflow_probability = nla_get_u32(a[ODP_DP_ATTR_SAMPLING]);
1329 }
1330
1331 static int odp_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1332 {
1333         struct nlattr **a = info->attrs;
1334         struct vport_parms parms;
1335         struct sk_buff *reply;
1336         struct datapath *dp;
1337         struct vport *vport;
1338         int err;
1339
1340         err = -EINVAL;
1341         if (!a[ODP_DP_ATTR_NAME])
1342                 goto err;
1343
1344         err = odp_dp_cmd_validate(a);
1345         if (err)
1346                 goto err;
1347
1348         rtnl_lock();
1349         err = -ENODEV;
1350         if (!try_module_get(THIS_MODULE))
1351                 goto err_unlock_rtnl;
1352
1353         err = -ENOMEM;
1354         dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1355         if (dp == NULL)
1356                 goto err_put_module;
1357         INIT_LIST_HEAD(&dp->port_list);
1358
1359         /* Initialize kobject for bridge.  This will be added as
1360          * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1361         dp->ifobj.kset = NULL;
1362         kobject_init(&dp->ifobj, &dp_ktype);
1363
1364         /* Allocate table. */
1365         err = -ENOMEM;
1366         rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
1367         if (!dp->table)
1368                 goto err_free_dp;
1369
1370         /* Set up our datapath device. */
1371         parms.name = nla_data(a[ODP_DP_ATTR_NAME]);
1372         parms.type = ODP_VPORT_TYPE_INTERNAL;
1373         parms.options = NULL;
1374         parms.dp = dp;
1375         parms.port_no = ODPP_LOCAL;
1376         vport = new_vport(&parms);
1377         if (IS_ERR(vport)) {
1378                 err = PTR_ERR(vport);
1379                 if (err == -EBUSY)
1380                         err = -EEXIST;
1381
1382                 goto err_destroy_table;
1383         }
1384         dp->dp_ifindex = vport_get_ifindex(vport);
1385
1386         dp->drop_frags = 0;
1387         dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1388         if (!dp->stats_percpu) {
1389                 err = -ENOMEM;
1390                 goto err_destroy_local_port;
1391         }
1392
1393         change_datapath(dp, a);
1394
1395         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1396         err = PTR_ERR(reply);
1397         if (IS_ERR(reply))
1398                 goto err_destroy_local_port;
1399
1400         list_add_tail(&dp->list_node, &dps);
1401         dp_sysfs_add_dp(dp);
1402
1403         rtnl_unlock();
1404
1405         genl_notify(reply, genl_info_net(info), info->snd_pid,
1406                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1407         return 0;
1408
1409 err_destroy_local_port:
1410         dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
1411 err_destroy_table:
1412         tbl_destroy(get_table_protected(dp), NULL);
1413 err_free_dp:
1414         kfree(dp);
1415 err_put_module:
1416         module_put(THIS_MODULE);
1417 err_unlock_rtnl:
1418         rtnl_unlock();
1419 err:
1420         return err;
1421 }
1422
1423 static int odp_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1424 {
1425         struct vport *vport, *next_vport;
1426         struct sk_buff *reply;
1427         struct datapath *dp;
1428         int err;
1429
1430         err = odp_dp_cmd_validate(info->attrs);
1431         if (err)
1432                 goto exit;
1433
1434         rtnl_lock();
1435         dp = lookup_datapath(info->userhdr, info->attrs);
1436         err = PTR_ERR(dp);
1437         if (IS_ERR(dp))
1438                 goto exit_unlock;
1439
1440         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_DEL);
1441         err = PTR_ERR(reply);
1442         if (IS_ERR(reply))
1443                 goto exit_unlock;
1444
1445         list_for_each_entry_safe (vport, next_vport, &dp->port_list, node)
1446                 if (vport->port_no != ODPP_LOCAL)
1447                         dp_detach_port(vport);
1448
1449         dp_sysfs_del_dp(dp);
1450         list_del(&dp->list_node);
1451         dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
1452
1453         /* rtnl_unlock() will wait until all the references to devices that
1454          * are pending unregistration have been dropped.  We do it here to
1455          * ensure that any internal devices (which contain DP pointers) are
1456          * fully destroyed before freeing the datapath.
1457          */
1458         rtnl_unlock();
1459
1460         call_rcu(&dp->rcu, destroy_dp_rcu);
1461         module_put(THIS_MODULE);
1462
1463         genl_notify(reply, genl_info_net(info), info->snd_pid,
1464                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1465
1466         return 0;
1467
1468 exit_unlock:
1469         rtnl_unlock();
1470 exit:
1471         return err;
1472 }
1473
1474 static int odp_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1475 {
1476         struct sk_buff *reply;
1477         struct datapath *dp;
1478         int err;
1479
1480         err = odp_dp_cmd_validate(info->attrs);
1481         if (err)
1482                 return err;
1483
1484         dp = lookup_datapath(info->userhdr, info->attrs);
1485         if (IS_ERR(dp))
1486                 return PTR_ERR(dp);
1487
1488         change_datapath(dp, info->attrs);
1489
1490         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1491         if (IS_ERR(reply)) {
1492                 err = PTR_ERR(reply);
1493                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1494                                 dp_datapath_multicast_group.id, err);
1495                 return 0;
1496         }
1497
1498         genl_notify(reply, genl_info_net(info), info->snd_pid,
1499                     dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1500         return 0;
1501 }
1502
1503 static int odp_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1504 {
1505         struct sk_buff *reply;
1506         struct datapath *dp;
1507         int err;
1508
1509         err = odp_dp_cmd_validate(info->attrs);
1510         if (err)
1511                 return err;
1512
1513         dp = lookup_datapath(info->userhdr, info->attrs);
1514         if (IS_ERR(dp))
1515                 return PTR_ERR(dp);
1516
1517         reply = odp_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, ODP_DP_CMD_NEW);
1518         if (IS_ERR(reply))
1519                 return PTR_ERR(reply);
1520
1521         return genlmsg_reply(reply, info);
1522 }
1523
1524 static int odp_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1525 {
1526         struct datapath *dp;
1527         int skip = cb->args[0];
1528         int i = 0;
1529
1530         list_for_each_entry (dp, &dps, list_node) {
1531                 if (i < skip)
1532                         continue;
1533                 if (odp_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1534                                          cb->nlh->nlmsg_seq, NLM_F_MULTI,
1535                                          ODP_DP_CMD_NEW) < 0)
1536                         break;
1537                 i++;
1538         }
1539
1540         cb->args[0] = i;
1541
1542         return skb->len;
1543 }
1544
1545 static struct genl_ops dp_datapath_genl_ops[] = {
1546         { .cmd = ODP_DP_CMD_NEW,
1547           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1548           .policy = datapath_policy,
1549           .doit = odp_dp_cmd_new
1550         },
1551         { .cmd = ODP_DP_CMD_DEL,
1552           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1553           .policy = datapath_policy,
1554           .doit = odp_dp_cmd_del
1555         },
1556         { .cmd = ODP_DP_CMD_GET,
1557           .flags = 0,               /* OK for unprivileged users. */
1558           .policy = datapath_policy,
1559           .doit = odp_dp_cmd_get,
1560           .dumpit = odp_dp_cmd_dump
1561         },
1562         { .cmd = ODP_DP_CMD_SET,
1563           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1564           .policy = datapath_policy,
1565           .doit = odp_dp_cmd_set,
1566         },
1567 };
1568
1569 static const struct nla_policy vport_policy[ODP_VPORT_ATTR_MAX + 1] = {
1570 #ifdef HAVE_NLA_NUL_STRING
1571         [ODP_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1572         [ODP_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1573         [ODP_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1574         [ODP_VPORT_ATTR_STATS] = { .len = sizeof(struct rtnl_link_stats64) },
1575         [ODP_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1576 #else
1577         [ODP_VPORT_ATTR_STATS] = { .minlen = sizeof(struct rtnl_link_stats64) },
1578         [ODP_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1579 #endif
1580         [ODP_VPORT_ATTR_MTU] = { .type = NLA_U32 },
1581         [ODP_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1582 };
1583
1584 static struct genl_family dp_vport_genl_family = {
1585         .id = GENL_ID_GENERATE,
1586         .hdrsize = sizeof(struct odp_header),
1587         .name = ODP_VPORT_FAMILY,
1588         .version = 1,
1589         .maxattr = ODP_VPORT_ATTR_MAX
1590 };
1591
1592 static struct genl_multicast_group dp_vport_multicast_group = {
1593         .name = ODP_VPORT_MCGROUP
1594 };
1595
1596 /* Called with RTNL lock or RCU read lock. */
1597 static int odp_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1598                                    u32 pid, u32 seq, u32 flags, u8 cmd)
1599 {
1600         struct odp_header *odp_header;
1601         struct nlattr *nla;
1602         int ifindex, iflink;
1603         int mtu;
1604         int err;
1605
1606         odp_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1607                                  flags, cmd);
1608         if (!odp_header)
1609                 return -EMSGSIZE;
1610
1611         odp_header->dp_ifindex = vport->dp->dp_ifindex;
1612
1613         NLA_PUT_U32(skb, ODP_VPORT_ATTR_PORT_NO, vport->port_no);
1614         NLA_PUT_U32(skb, ODP_VPORT_ATTR_TYPE, vport_get_type(vport));
1615         NLA_PUT_STRING(skb, ODP_VPORT_ATTR_NAME, vport_get_name(vport));
1616
1617         nla = nla_reserve(skb, ODP_VPORT_ATTR_STATS, sizeof(struct rtnl_link_stats64));
1618         if (!nla)
1619                 goto nla_put_failure;
1620         if (vport_get_stats(vport, nla_data(nla)))
1621                 __skb_trim(skb, skb->len - nla->nla_len);
1622
1623         NLA_PUT(skb, ODP_VPORT_ATTR_ADDRESS, ETH_ALEN, vport_get_addr(vport));
1624
1625         mtu = vport_get_mtu(vport);
1626         if (mtu)
1627                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_MTU, mtu);
1628
1629         err = vport_get_options(vport, skb);
1630         if (err == -EMSGSIZE)
1631                 goto error;
1632
1633         ifindex = vport_get_ifindex(vport);
1634         if (ifindex > 0)
1635                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFINDEX, ifindex);
1636
1637         iflink = vport_get_iflink(vport);
1638         if (iflink > 0)
1639                 NLA_PUT_U32(skb, ODP_VPORT_ATTR_IFLINK, iflink);
1640
1641         return genlmsg_end(skb, odp_header);
1642
1643 nla_put_failure:
1644         err = -EMSGSIZE;
1645 error:
1646         genlmsg_cancel(skb, odp_header);
1647         return err;
1648 }
1649
1650 /* Called with RTNL lock or RCU read lock. */
1651 static struct sk_buff *odp_vport_cmd_build_info(struct vport *vport, u32 pid,
1652                                                 u32 seq, u8 cmd)
1653 {
1654         struct sk_buff *skb;
1655         int retval;
1656
1657         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1658         if (!skb)
1659                 return ERR_PTR(-ENOMEM);
1660
1661         retval = odp_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1662         if (retval < 0) {
1663                 kfree_skb(skb);
1664                 return ERR_PTR(retval);
1665         }
1666         return skb;
1667 }
1668
1669 static int odp_vport_cmd_validate(struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1670 {
1671         return VERIFY_NUL_STRING(a[ODP_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1672 }
1673
1674 /* Called with RTNL lock or RCU read lock. */
1675 static struct vport *lookup_vport(struct odp_header *odp_header,
1676                                   struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1677 {
1678         struct datapath *dp;
1679         struct vport *vport;
1680
1681         if (a[ODP_VPORT_ATTR_NAME]) {
1682                 vport = vport_locate(nla_data(a[ODP_VPORT_ATTR_NAME]));
1683                 if (!vport)
1684                         return ERR_PTR(-ENODEV);
1685                 return vport;
1686         } else if (a[ODP_VPORT_ATTR_PORT_NO]) {
1687                 u32 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1688
1689                 if (port_no >= DP_MAX_PORTS)
1690                         return ERR_PTR(-EFBIG);
1691
1692                 dp = get_dp(odp_header->dp_ifindex);
1693                 if (!dp)
1694                         return ERR_PTR(-ENODEV);
1695
1696                 vport = get_vport_protected(dp, port_no);
1697                 if (!vport)
1698                         return ERR_PTR(-ENOENT);
1699                 return vport;
1700         } else
1701                 return ERR_PTR(-EINVAL);
1702 }
1703
1704 /* Called with RTNL lock. */
1705 static int change_vport(struct vport *vport, struct nlattr *a[ODP_VPORT_ATTR_MAX + 1])
1706 {
1707         int err = 0;
1708         if (a[ODP_VPORT_ATTR_STATS])
1709                 err = vport_set_stats(vport, nla_data(a[ODP_VPORT_ATTR_STATS]));
1710         if (!err && a[ODP_VPORT_ATTR_ADDRESS])
1711                 err = vport_set_addr(vport, nla_data(a[ODP_VPORT_ATTR_ADDRESS]));
1712         if (!err && a[ODP_VPORT_ATTR_MTU])
1713                 err = vport_set_mtu(vport, nla_get_u32(a[ODP_VPORT_ATTR_MTU]));
1714         return err;
1715 }
1716
1717 static int odp_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1718 {
1719         struct nlattr **a = info->attrs;
1720         struct odp_header *odp_header = info->userhdr;
1721         struct vport_parms parms;
1722         struct sk_buff *reply;
1723         struct vport *vport;
1724         struct datapath *dp;
1725         u32 port_no;
1726         int err;
1727
1728         err = -EINVAL;
1729         if (!a[ODP_VPORT_ATTR_NAME] || !a[ODP_VPORT_ATTR_TYPE])
1730                 goto exit;
1731
1732         err = odp_vport_cmd_validate(a);
1733         if (err)
1734                 goto exit;
1735
1736         rtnl_lock();
1737         dp = get_dp(odp_header->dp_ifindex);
1738         err = -ENODEV;
1739         if (!dp)
1740                 goto exit_unlock;
1741
1742         if (a[ODP_VPORT_ATTR_PORT_NO]) {
1743                 port_no = nla_get_u32(a[ODP_VPORT_ATTR_PORT_NO]);
1744
1745                 err = -EFBIG;
1746                 if (port_no >= DP_MAX_PORTS)
1747                         goto exit_unlock;
1748
1749                 vport = get_vport_protected(dp, port_no);
1750                 err = -EBUSY;
1751                 if (vport)
1752                         goto exit_unlock;
1753         } else {
1754                 for (port_no = 1; ; port_no++) {
1755                         if (port_no >= DP_MAX_PORTS) {
1756                                 err = -EFBIG;
1757                                 goto exit_unlock;
1758                         }
1759                         vport = get_vport_protected(dp, port_no);
1760                         if (!vport)
1761                                 break;
1762                 }
1763         }
1764
1765         parms.name = nla_data(a[ODP_VPORT_ATTR_NAME]);
1766         parms.type = nla_get_u32(a[ODP_VPORT_ATTR_TYPE]);
1767         parms.options = a[ODP_VPORT_ATTR_OPTIONS];
1768         parms.dp = dp;
1769         parms.port_no = port_no;
1770
1771         vport = new_vport(&parms);
1772         err = PTR_ERR(vport);
1773         if (IS_ERR(vport))
1774                 goto exit_unlock;
1775
1776         set_internal_devs_mtu(dp);
1777         dp_sysfs_add_if(vport);
1778
1779         err = change_vport(vport, a);
1780         if (!err) {
1781                 reply = odp_vport_cmd_build_info(vport, info->snd_pid,
1782                                                  info->snd_seq, ODP_VPORT_CMD_NEW);
1783                 if (IS_ERR(reply))
1784                         err = PTR_ERR(reply);
1785         }
1786         if (err) {
1787                 dp_detach_port(vport);
1788                 goto exit_unlock;
1789         }
1790         genl_notify(reply, genl_info_net(info), info->snd_pid,
1791                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1792
1793
1794 exit_unlock:
1795         rtnl_unlock();
1796 exit:
1797         return err;
1798 }
1799
1800 static int odp_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1801 {
1802         struct nlattr **a = info->attrs;
1803         struct sk_buff *reply;
1804         struct vport *vport;
1805         int err;
1806
1807         err = odp_vport_cmd_validate(a);
1808         if (err)
1809                 goto exit;
1810
1811         rtnl_lock();
1812         vport = lookup_vport(info->userhdr, a);
1813         err = PTR_ERR(vport);
1814         if (IS_ERR(vport))
1815                 goto exit_unlock;
1816
1817         err = 0;
1818         if (a[ODP_VPORT_ATTR_OPTIONS])
1819                 err = vport_set_options(vport, a[ODP_VPORT_ATTR_OPTIONS]);
1820         if (!err)
1821                 err = change_vport(vport, a);
1822
1823         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1824                                          ODP_VPORT_CMD_NEW);
1825         if (IS_ERR(reply)) {
1826                 err = PTR_ERR(reply);
1827                 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1828                                 dp_vport_multicast_group.id, err);
1829                 return 0;
1830         }
1831
1832         genl_notify(reply, genl_info_net(info), info->snd_pid,
1833                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1834
1835 exit_unlock:
1836         rtnl_unlock();
1837 exit:
1838         return err;
1839 }
1840
1841 static int odp_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1842 {
1843         struct nlattr **a = info->attrs;
1844         struct sk_buff *reply;
1845         struct vport *vport;
1846         int err;
1847
1848         err = odp_vport_cmd_validate(a);
1849         if (err)
1850                 goto exit;
1851
1852         rtnl_lock();
1853         vport = lookup_vport(info->userhdr, a);
1854         err = PTR_ERR(vport);
1855         if (IS_ERR(vport))
1856                 goto exit_unlock;
1857
1858         if (vport->port_no == ODPP_LOCAL) {
1859                 err = -EINVAL;
1860                 goto exit_unlock;
1861         }
1862
1863         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1864                                          ODP_VPORT_CMD_DEL);
1865         err = PTR_ERR(reply);
1866         if (IS_ERR(reply))
1867                 goto exit_unlock;
1868
1869         err = dp_detach_port(vport);
1870
1871         genl_notify(reply, genl_info_net(info), info->snd_pid,
1872                     dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1873
1874 exit_unlock:
1875         rtnl_unlock();
1876 exit:
1877         return err;
1878 }
1879
1880 static int odp_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1881 {
1882         struct nlattr **a = info->attrs;
1883         struct odp_header *odp_header = info->userhdr;
1884         struct sk_buff *reply;
1885         struct vport *vport;
1886         int err;
1887
1888         err = odp_vport_cmd_validate(a);
1889         if (err)
1890                 goto exit;
1891
1892         rcu_read_lock();
1893         vport = lookup_vport(odp_header, a);
1894         err = PTR_ERR(vport);
1895         if (IS_ERR(vport))
1896                 goto exit_unlock;
1897
1898         reply = odp_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1899                                          ODP_VPORT_CMD_NEW);
1900         err = PTR_ERR(reply);
1901         if (IS_ERR(reply))
1902                 goto exit_unlock;
1903
1904         err = genlmsg_reply(reply, info);
1905
1906 exit_unlock:
1907         rcu_read_unlock();
1908 exit:
1909         return err;
1910 }
1911
1912 static int odp_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1913 {
1914         struct odp_header *odp_header = genlmsg_data(nlmsg_data(cb->nlh));
1915         struct datapath *dp;
1916         u32 port_no;
1917         int retval;
1918
1919         dp = get_dp(odp_header->dp_ifindex);
1920         if (!dp)
1921                 return -ENODEV;
1922
1923         rcu_read_lock();
1924         for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1925                 struct vport *vport;
1926
1927                 vport = get_vport_protected(dp, port_no);
1928                 if (!vport)
1929                         continue;
1930
1931                 if (odp_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1932                                             cb->nlh->nlmsg_seq, NLM_F_MULTI,
1933                                             ODP_VPORT_CMD_NEW) < 0)
1934                         break;
1935         }
1936         rcu_read_unlock();
1937
1938         cb->args[0] = port_no;
1939         retval = skb->len;
1940
1941         return retval;
1942 }
1943
1944 static struct genl_ops dp_vport_genl_ops[] = {
1945         { .cmd = ODP_VPORT_CMD_NEW,
1946           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1947           .policy = vport_policy,
1948           .doit = odp_vport_cmd_new
1949         },
1950         { .cmd = ODP_VPORT_CMD_DEL,
1951           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1952           .policy = vport_policy,
1953           .doit = odp_vport_cmd_del
1954         },
1955         { .cmd = ODP_VPORT_CMD_GET,
1956           .flags = 0,               /* OK for unprivileged users. */
1957           .policy = vport_policy,
1958           .doit = odp_vport_cmd_get,
1959           .dumpit = odp_vport_cmd_dump
1960         },
1961         { .cmd = ODP_VPORT_CMD_SET,
1962           .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1963           .policy = vport_policy,
1964           .doit = odp_vport_cmd_set,
1965         },
1966 };
1967
1968 struct genl_family_and_ops {
1969         struct genl_family *family;
1970         struct genl_ops *ops;
1971         int n_ops;
1972         struct genl_multicast_group *group;
1973 };
1974
1975 static const struct genl_family_and_ops dp_genl_families[] = {
1976         { &dp_datapath_genl_family,
1977           dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1978           &dp_datapath_multicast_group },
1979         { &dp_vport_genl_family,
1980           dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1981           &dp_vport_multicast_group },
1982         { &dp_flow_genl_family,
1983           dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1984           &dp_flow_multicast_group },
1985         { &dp_packet_genl_family,
1986           dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1987           NULL },
1988 };
1989
1990 static void dp_unregister_genl(int n_families)
1991 {
1992         int i;
1993
1994         for (i = 0; i < n_families; i++) {
1995                 genl_unregister_family(dp_genl_families[i].family);
1996         }
1997 }
1998
1999 static int dp_register_genl(void)
2000 {
2001         int n_registered;
2002         int err;
2003         int i;
2004
2005         n_registered = 0;
2006         for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2007                 const struct genl_family_and_ops *f = &dp_genl_families[i];
2008
2009                 err = genl_register_family_with_ops(f->family, f->ops,
2010                                                     f->n_ops);
2011                 if (err)
2012                         goto error;
2013                 n_registered++;
2014
2015                 if (f->group) {
2016                         err = genl_register_mc_group(f->family, f->group);
2017                         if (err)
2018                                 goto error;
2019                 }
2020         }
2021
2022         err = packet_register_mc_groups();
2023         if (err)
2024                 goto error;
2025         return 0;
2026
2027 error:
2028         dp_unregister_genl(n_registered);
2029         return err;
2030 }
2031
2032 static int __init dp_init(void)
2033 {
2034         struct sk_buff *dummy_skb;
2035         int err;
2036
2037         BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2038
2039         printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2040
2041         err = flow_init();
2042         if (err)
2043                 goto error;
2044
2045         err = vport_init();
2046         if (err)
2047                 goto error_flow_exit;
2048
2049         err = register_netdevice_notifier(&dp_device_notifier);
2050         if (err)
2051                 goto error_vport_exit;
2052
2053         err = dp_register_genl();
2054         if (err < 0)
2055                 goto error_unreg_notifier;
2056
2057         return 0;
2058
2059 error_unreg_notifier:
2060         unregister_netdevice_notifier(&dp_device_notifier);
2061 error_vport_exit:
2062         vport_exit();
2063 error_flow_exit:
2064         flow_exit();
2065 error:
2066         return err;
2067 }
2068
2069 static void dp_cleanup(void)
2070 {
2071         rcu_barrier();
2072         dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2073         unregister_netdevice_notifier(&dp_device_notifier);
2074         vport_exit();
2075         flow_exit();
2076 }
2077
2078 module_init(dp_init);
2079 module_exit(dp_cleanup);
2080
2081 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2082 MODULE_LICENSE("GPL");