2 * Copyright (c) 2007, 2008, 2009, 2010, 2011 Nicira Networks.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 /* Functions for managing the dp interface/device. */
11 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13 #include <linux/init.h>
14 #include <linux/module.h>
16 #include <linux/if_arp.h>
17 #include <linux/if_vlan.h>
20 #include <linux/delay.h>
21 #include <linux/time.h>
22 #include <linux/etherdevice.h>
23 #include <linux/kernel.h>
24 #include <linux/kthread.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/wait.h>
33 #include <asm/system.h>
34 #include <asm/div64.h>
36 #include <linux/highmem.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/dmi.h>
43 #include <net/inet_ecn.h>
44 #include <linux/compat.h>
46 #include "openvswitch/datapath-protocol.h"
51 #include "loop_counter.h"
52 #include "odp-compat.h"
54 #include "vport-internal_dev.h"
56 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
57 EXPORT_SYMBOL(dp_ioctl_hook);
59 /* Datapaths. Protected on the read side by rcu_read_lock, on the write side
62 * dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
65 * It is safe to access the datapath and vport structures with just
68 static struct datapath __rcu *dps[ODP_MAX];
69 static DEFINE_MUTEX(dp_mutex);
71 static int new_vport(struct datapath *, struct odp_port *, int port_no);
73 /* Must be called with rcu_read_lock or dp_mutex. */
74 struct datapath *get_dp(int dp_idx)
76 if (dp_idx < 0 || dp_idx >= ODP_MAX)
78 return rcu_dereference_check(dps[dp_idx], rcu_read_lock_held() ||
79 lockdep_is_held(&dp_mutex));
81 EXPORT_SYMBOL_GPL(get_dp);
83 static struct datapath *get_dp_locked(int dp_idx)
87 mutex_lock(&dp_mutex);
90 mutex_lock(&dp->mutex);
91 mutex_unlock(&dp_mutex);
95 static struct tbl *get_table_protected(struct datapath *dp)
97 return rcu_dereference_protected(dp->table,
98 lockdep_is_held(&dp->mutex));
101 static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
103 return rcu_dereference_protected(dp->ports[port_no],
104 lockdep_is_held(&dp->mutex));
107 /* Must be called with rcu_read_lock or RTNL lock. */
108 const char *dp_name(const struct datapath *dp)
110 return vport_get_name(rcu_dereference_rtnl(dp->ports[ODPP_LOCAL]));
113 static inline size_t br_nlmsg_size(void)
115 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
116 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
117 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
118 + nla_total_size(4) /* IFLA_MASTER */
119 + nla_total_size(4) /* IFLA_MTU */
120 + nla_total_size(4) /* IFLA_LINK */
121 + nla_total_size(1); /* IFLA_OPERSTATE */
124 static int dp_fill_ifinfo(struct sk_buff *skb,
125 const struct vport *port,
126 int event, unsigned int flags)
128 struct datapath *dp = port->dp;
129 int ifindex = vport_get_ifindex(port);
130 int iflink = vport_get_iflink(port);
131 struct ifinfomsg *hdr;
132 struct nlmsghdr *nlh;
140 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
144 hdr = nlmsg_data(nlh);
145 hdr->ifi_family = AF_BRIDGE;
147 hdr->ifi_type = ARPHRD_ETHER;
148 hdr->ifi_index = ifindex;
149 hdr->ifi_flags = vport_get_flags(port);
152 NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
153 NLA_PUT_U32(skb, IFLA_MASTER,
154 vport_get_ifindex(get_vport_protected(dp, ODPP_LOCAL)));
155 NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
156 #ifdef IFLA_OPERSTATE
157 NLA_PUT_U8(skb, IFLA_OPERSTATE,
158 vport_is_running(port)
159 ? vport_get_operstate(port)
163 NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
165 if (ifindex != iflink)
166 NLA_PUT_U32(skb, IFLA_LINK,iflink);
168 return nlmsg_end(skb, nlh);
171 nlmsg_cancel(skb, nlh);
175 static void dp_ifinfo_notify(int event, struct vport *port)
180 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
184 err = dp_fill_ifinfo(skb, port, event, 0);
186 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
187 WARN_ON(err == -EMSGSIZE);
191 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
195 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
198 static void release_dp(struct kobject *kobj)
200 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
204 static struct kobj_type dp_ktype = {
205 .release = release_dp
208 static int create_dp(int dp_idx, const char __user *devnamep)
210 struct odp_port internal_dev_port;
211 char devname[IFNAMSIZ];
217 int retval = strncpy_from_user(devname, devnamep, IFNAMSIZ);
221 } else if (retval >= IFNAMSIZ) {
226 snprintf(devname, sizeof(devname), "of%d", dp_idx);
230 mutex_lock(&dp_mutex);
232 if (!try_module_get(THIS_MODULE))
235 /* Exit early if a datapath with that number already exists.
236 * (We don't use -EEXIST because that's ambiguous with 'devname'
237 * conflicting with an existing network device name.) */
243 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
246 INIT_LIST_HEAD(&dp->port_list);
247 mutex_init(&dp->mutex);
248 mutex_lock(&dp->mutex);
250 for (i = 0; i < DP_N_QUEUES; i++)
251 skb_queue_head_init(&dp->queues[i]);
252 init_waitqueue_head(&dp->waitqueue);
254 /* Initialize kobject for bridge. This will be added as
255 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
256 dp->ifobj.kset = NULL;
257 kobject_init(&dp->ifobj, &dp_ktype);
259 /* Allocate table. */
261 rcu_assign_pointer(dp->table, tbl_create(TBL_MIN_BUCKETS));
265 /* Set up our datapath device. */
266 BUILD_BUG_ON(sizeof(internal_dev_port.devname) != sizeof(devname));
267 strcpy(internal_dev_port.devname, devname);
268 strcpy(internal_dev_port.type, "internal");
269 err = new_vport(dp, &internal_dev_port, ODPP_LOCAL);
274 goto err_destroy_table;
278 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
279 if (!dp->stats_percpu) {
281 goto err_destroy_local_port;
284 rcu_assign_pointer(dps[dp_idx], dp);
287 mutex_unlock(&dp->mutex);
288 mutex_unlock(&dp_mutex);
293 err_destroy_local_port:
294 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
296 tbl_destroy(get_table_protected(dp), NULL);
298 mutex_unlock(&dp->mutex);
301 module_put(THIS_MODULE);
303 mutex_unlock(&dp_mutex);
309 static void destroy_dp_rcu(struct rcu_head *rcu)
311 struct datapath *dp = container_of(rcu, struct datapath, rcu);
314 for (i = 0; i < DP_N_QUEUES; i++)
315 skb_queue_purge(&dp->queues[i]);
317 tbl_destroy((struct tbl __force *)dp->table, flow_free_tbl);
318 free_percpu(dp->stats_percpu);
319 kobject_put(&dp->ifobj);
322 static int destroy_dp(int dp_idx)
329 mutex_lock(&dp_mutex);
336 mutex_lock(&dp->mutex);
338 list_for_each_entry_safe (p, n, &dp->port_list, node)
339 if (p->port_no != ODPP_LOCAL)
343 rcu_assign_pointer(dps[dp->dp_idx], NULL);
344 dp_detach_port(get_vport_protected(dp, ODPP_LOCAL));
346 mutex_unlock(&dp->mutex);
347 call_rcu(&dp->rcu, destroy_dp_rcu);
348 module_put(THIS_MODULE);
351 mutex_unlock(&dp_mutex);
356 /* Called with RTNL lock and dp->mutex. */
357 static int new_vport(struct datapath *dp, struct odp_port *odp_port, int port_no)
359 struct vport_parms parms;
362 parms.name = odp_port->devname;
363 parms.type = odp_port->type;
364 parms.config = odp_port->config;
366 parms.port_no = port_no;
369 vport = vport_add(&parms);
373 return PTR_ERR(vport);
375 rcu_assign_pointer(dp->ports[port_no], vport);
376 list_add_rcu(&vport->node, &dp->port_list);
379 dp_ifinfo_notify(RTM_NEWLINK, vport);
384 static int attach_port(int dp_idx, struct odp_port __user *portp)
387 struct odp_port port;
392 if (copy_from_user(&port, portp, sizeof(port)))
394 port.devname[IFNAMSIZ - 1] = '\0';
395 port.type[VPORT_TYPE_SIZE - 1] = '\0';
398 dp = get_dp_locked(dp_idx);
401 goto out_unlock_rtnl;
403 for (port_no = 1; port_no < DP_MAX_PORTS; port_no++)
404 if (!dp->ports[port_no])
410 err = new_vport(dp, &port, port_no);
414 set_internal_devs_mtu(dp);
415 dp_sysfs_add_if(get_vport_protected(dp, port_no));
417 err = put_user(port_no, &portp->port);
420 mutex_unlock(&dp->mutex);
427 int dp_detach_port(struct vport *p)
433 if (p->port_no != ODPP_LOCAL)
435 dp_ifinfo_notify(RTM_DELLINK, p);
437 /* First drop references to device. */
439 list_del_rcu(&p->node);
440 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
442 /* Then destroy it. */
450 static int detach_port(int dp_idx, int port_no)
457 if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
461 dp = get_dp_locked(dp_idx);
464 goto out_unlock_rtnl;
466 p = get_vport_protected(dp, port_no);
471 err = dp_detach_port(p);
474 mutex_unlock(&dp->mutex);
481 /* Must be called with rcu_read_lock. */
482 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
484 struct datapath *dp = p->dp;
485 struct dp_stats_percpu *stats;
486 int stats_counter_off;
487 struct sw_flow_actions *acts;
488 struct loop_counter *loop;
491 OVS_CB(skb)->vport = p;
493 if (!OVS_CB(skb)->flow) {
494 struct odp_flow_key key;
495 struct tbl_node *flow_node;
498 /* Extract flow from 'skb' into 'key'. */
499 error = flow_extract(skb, p ? p->port_no : ODPP_NONE, &key, &is_frag);
500 if (unlikely(error)) {
505 if (is_frag && dp->drop_frags) {
507 stats_counter_off = offsetof(struct dp_stats_percpu, n_frags);
512 flow_node = tbl_lookup(rcu_dereference(dp->table), &key,
513 flow_hash(&key), flow_cmp);
514 if (unlikely(!flow_node)) {
515 dp_output_control(dp, skb, _ODPL_MISS_NR,
516 (__force u64)OVS_CB(skb)->tun_id);
517 stats_counter_off = offsetof(struct dp_stats_percpu, n_missed);
521 OVS_CB(skb)->flow = flow_cast(flow_node);
524 stats_counter_off = offsetof(struct dp_stats_percpu, n_hit);
525 flow_used(OVS_CB(skb)->flow, skb);
527 acts = rcu_dereference(OVS_CB(skb)->flow->sf_acts);
529 /* Check whether we've looped too much. */
530 loop = loop_get_counter();
531 if (unlikely(++loop->count > MAX_LOOPS))
532 loop->looping = true;
533 if (unlikely(loop->looping)) {
534 loop_suppress(dp, acts);
539 /* Execute actions. */
540 execute_actions(dp, skb, &OVS_CB(skb)->flow->key, acts->actions,
543 /* Check whether sub-actions looped too much. */
544 if (unlikely(loop->looping))
545 loop_suppress(dp, acts);
548 /* Decrement loop counter. */
550 loop->looping = false;
554 /* Update datapath statistics. */
556 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
558 write_seqcount_begin(&stats->seqlock);
559 (*(u64 *)((u8 *)stats + stats_counter_off))++;
560 write_seqcount_end(&stats->seqlock);
565 /* Append each packet in 'skb' list to 'queue'. There will be only one packet
566 * unless we broke up a GSO packet. */
567 static int queue_control_packets(struct sk_buff *skb, struct sk_buff_head *queue,
568 int queue_no, u64 arg)
570 struct sk_buff *nskb;
574 if (OVS_CB(skb)->vport)
575 port_no = OVS_CB(skb)->vport->port_no;
577 port_no = ODPP_LOCAL;
580 struct odp_msg *header;
585 err = skb_cow(skb, sizeof(*header));
589 header = (struct odp_msg*)__skb_push(skb, sizeof(*header));
590 header->type = queue_no;
591 header->length = skb->len;
592 header->port = port_no;
594 skb_queue_tail(queue, skb);
602 while ((skb = nskb) != NULL) {
609 int dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
612 struct dp_stats_percpu *stats;
613 struct sk_buff_head *queue;
616 WARN_ON_ONCE(skb_shared(skb));
617 BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR && queue_no != _ODPL_SFLOW_NR);
618 queue = &dp->queues[queue_no];
620 if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
623 forward_ip_summed(skb);
625 err = vswitch_skb_checksum_setup(skb);
629 /* Break apart GSO packets into their component pieces. Otherwise
630 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
631 if (skb_is_gso(skb)) {
632 struct sk_buff *nskb = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
642 err = queue_control_packets(skb, queue, queue_no, arg);
643 wake_up_interruptible(&dp->waitqueue);
650 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
652 write_seqcount_begin(&stats->seqlock);
654 write_seqcount_end(&stats->seqlock);
661 static int flush_flows(struct datapath *dp)
663 struct tbl *old_table = get_table_protected(dp);
664 struct tbl *new_table;
666 new_table = tbl_create(TBL_MIN_BUCKETS);
670 rcu_assign_pointer(dp->table, new_table);
672 tbl_deferred_destroy(old_table, flow_free_tbl);
677 static int validate_actions(const struct nlattr *actions, u32 actions_len)
679 const struct nlattr *a;
682 nla_for_each_attr(a, actions, actions_len, rem) {
683 static const u32 action_lens[ODPAT_MAX + 1] = {
685 [ODPAT_CONTROLLER] = 8,
686 [ODPAT_SET_DL_TCI] = 2,
687 [ODPAT_STRIP_VLAN] = 0,
688 [ODPAT_SET_DL_SRC] = ETH_ALEN,
689 [ODPAT_SET_DL_DST] = ETH_ALEN,
690 [ODPAT_SET_NW_SRC] = 4,
691 [ODPAT_SET_NW_DST] = 4,
692 [ODPAT_SET_NW_TOS] = 1,
693 [ODPAT_SET_TP_SRC] = 2,
694 [ODPAT_SET_TP_DST] = 2,
695 [ODPAT_SET_TUNNEL] = 8,
696 [ODPAT_SET_PRIORITY] = 4,
697 [ODPAT_POP_PRIORITY] = 0,
698 [ODPAT_DROP_SPOOFED_ARP] = 0,
700 int type = nla_type(a);
702 if (type > ODPAT_MAX || nla_len(a) != action_lens[type])
709 case ODPAT_CONTROLLER:
710 case ODPAT_STRIP_VLAN:
711 case ODPAT_SET_DL_SRC:
712 case ODPAT_SET_DL_DST:
713 case ODPAT_SET_NW_SRC:
714 case ODPAT_SET_NW_DST:
715 case ODPAT_SET_TP_SRC:
716 case ODPAT_SET_TP_DST:
717 case ODPAT_SET_TUNNEL:
718 case ODPAT_SET_PRIORITY:
719 case ODPAT_POP_PRIORITY:
720 case ODPAT_DROP_SPOOFED_ARP:
721 /* No validation needed. */
725 if (nla_get_u32(a) >= DP_MAX_PORTS)
729 case ODPAT_SET_DL_TCI:
730 if (nla_get_be16(a) & htons(VLAN_CFI_MASK))
734 case ODPAT_SET_NW_TOS:
735 if (nla_get_u8(a) & INET_ECN_MASK)
750 static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
752 struct sw_flow_actions *actions;
755 actions = flow_actions_alloc(flow->actions_len);
756 error = PTR_ERR(actions);
761 if (copy_from_user(actions->actions,
762 (struct nlattr __user __force *)flow->actions,
764 goto error_free_actions;
765 error = validate_actions(actions->actions, actions->actions_len);
767 goto error_free_actions;
774 return ERR_PTR(error);
777 static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
780 struct timespec offset_ts, used, now_mono;
782 ktime_get_ts(&now_mono);
783 jiffies_to_timespec(jiffies - flow->used, &offset_ts);
784 set_normalized_timespec(&used, now_mono.tv_sec - offset_ts.tv_sec,
785 now_mono.tv_nsec - offset_ts.tv_nsec);
787 stats->used_sec = used.tv_sec;
788 stats->used_nsec = used.tv_nsec;
791 stats->used_nsec = 0;
794 stats->n_packets = flow->packet_count;
795 stats->n_bytes = flow->byte_count;
797 stats->tcp_flags = flow->tcp_flags;
801 static void clear_stats(struct sw_flow *flow)
805 flow->packet_count = 0;
806 flow->byte_count = 0;
809 static int expand_table(struct datapath *dp)
811 struct tbl *old_table = get_table_protected(dp);
812 struct tbl *new_table;
814 new_table = tbl_expand(old_table);
815 if (IS_ERR(new_table))
816 return PTR_ERR(new_table);
818 rcu_assign_pointer(dp->table, new_table);
819 tbl_deferred_destroy(old_table, NULL);
824 static int do_put_flow(struct datapath *dp, struct odp_flow_put *uf,
825 struct odp_flow_stats *stats)
827 struct tbl_node *flow_node;
828 struct sw_flow *flow;
830 struct sw_flow_actions *acts = NULL;
834 hash = flow_hash(&uf->flow.key);
835 table = get_table_protected(dp);
836 flow_node = tbl_lookup(table, &uf->flow.key, hash, flow_cmp);
840 if (!(uf->flags & ODPPF_CREATE))
843 /* Expand table, if necessary, to make room. */
844 if (tbl_count(table) >= tbl_n_buckets(table)) {
845 error = expand_table(dp);
848 table = get_table_protected(dp);
854 error = PTR_ERR(flow);
857 flow->key = uf->flow.key;
860 /* Obtain actions. */
861 acts = get_actions(&uf->flow);
862 error = PTR_ERR(acts);
864 goto error_free_flow;
865 rcu_assign_pointer(flow->sf_acts, acts);
867 /* Put flow in bucket. */
868 error = tbl_insert(table, &flow->tbl_node, hash);
870 goto error_free_flow_acts;
872 memset(stats, 0, sizeof(struct odp_flow_stats));
874 /* We found a matching flow. */
875 struct sw_flow_actions *old_acts, *new_acts;
877 flow = flow_cast(flow_node);
879 /* Bail out if we're not allowed to modify an existing flow. */
881 if (!(uf->flags & ODPPF_MODIFY))
885 new_acts = get_actions(&uf->flow);
886 error = PTR_ERR(new_acts);
887 if (IS_ERR(new_acts))
890 old_acts = rcu_dereference_protected(flow->sf_acts,
891 lockdep_is_held(&dp->mutex));
892 if (old_acts->actions_len != new_acts->actions_len ||
893 memcmp(old_acts->actions, new_acts->actions,
894 old_acts->actions_len)) {
895 rcu_assign_pointer(flow->sf_acts, new_acts);
896 flow_deferred_free_acts(old_acts);
901 /* Fetch stats, then clear them if necessary. */
902 spin_lock_bh(&flow->lock);
903 get_stats(flow, stats);
904 if (uf->flags & ODPPF_ZERO_STATS)
906 spin_unlock_bh(&flow->lock);
911 error_free_flow_acts:
914 flow->sf_acts = NULL;
920 static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
922 struct odp_flow_stats stats;
923 struct odp_flow_put uf;
926 if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
929 error = do_put_flow(dp, &uf, &stats);
933 if (copy_to_user(&ufp->flow.stats, &stats,
934 sizeof(struct odp_flow_stats)))
940 static int do_answer_query(struct datapath *dp, struct sw_flow *flow,
942 struct odp_flow_stats __user *ustats,
943 struct nlattr __user *actions,
944 u32 __user *actions_lenp)
946 struct sw_flow_actions *sf_acts;
947 struct odp_flow_stats stats;
950 spin_lock_bh(&flow->lock);
951 get_stats(flow, &stats);
952 if (query_flags & ODPFF_ZERO_TCP_FLAGS)
955 spin_unlock_bh(&flow->lock);
957 if (copy_to_user(ustats, &stats, sizeof(struct odp_flow_stats)) ||
958 get_user(actions_len, actions_lenp))
964 sf_acts = rcu_dereference_protected(flow->sf_acts,
965 lockdep_is_held(&dp->mutex));
966 if (put_user(sf_acts->actions_len, actions_lenp) ||
967 (actions && copy_to_user(actions, sf_acts->actions,
968 min(sf_acts->actions_len, actions_len))))
974 static int answer_query(struct datapath *dp, struct sw_flow *flow,
975 u32 query_flags, struct odp_flow __user *ufp)
977 struct nlattr __user *actions;
979 if (get_user(actions, (struct nlattr __user * __user *)&ufp->actions))
982 return do_answer_query(dp, flow, query_flags,
983 &ufp->stats, actions, &ufp->actions_len);
986 static struct sw_flow *do_del_flow(struct datapath *dp, struct odp_flow_key *key)
988 struct tbl *table = get_table_protected(dp);
989 struct tbl_node *flow_node;
992 flow_node = tbl_lookup(table, key, flow_hash(key), flow_cmp);
994 return ERR_PTR(-ENOENT);
996 error = tbl_remove(table, flow_node);
998 return ERR_PTR(error);
1000 /* XXX Returned flow_node's statistics might lose a few packets, since
1001 * other CPUs can be using this flow. We used to synchronize_rcu() to
1002 * make sure that we get completely accurate stats, but that blows our
1003 * performance, badly. */
1004 return flow_cast(flow_node);
1007 static int del_flow(struct datapath *dp, struct odp_flow __user *ufp)
1009 struct sw_flow *flow;
1013 if (copy_from_user(&uf, ufp, sizeof(uf)))
1016 flow = do_del_flow(dp, &uf.key);
1018 return PTR_ERR(flow);
1020 error = answer_query(dp, flow, 0, ufp);
1021 flow_deferred_free(flow);
1025 static int do_query_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1027 struct tbl *table = get_table_protected(dp);
1030 for (i = 0; i < flowvec->n_flows; i++) {
1031 struct odp_flow __user *ufp = (struct odp_flow __user __force *)&flowvec->flows[i];
1033 struct tbl_node *flow_node;
1036 if (copy_from_user(&uf, ufp, sizeof(uf)))
1039 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1041 error = put_user(ENOENT, &ufp->stats.error);
1043 error = answer_query(dp, flow_cast(flow_node), uf.flags, ufp);
1047 return flowvec->n_flows;
1050 static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1051 int (*function)(struct datapath *,
1052 const struct odp_flowvec *))
1054 struct odp_flowvec __user *uflowvec;
1055 struct odp_flowvec flowvec;
1058 uflowvec = (struct odp_flowvec __user *)argp;
1059 if (copy_from_user(&flowvec, uflowvec, sizeof(flowvec)))
1062 if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
1065 retval = function(dp, &flowvec);
1066 return (retval < 0 ? retval
1067 : retval == flowvec.n_flows ? 0
1068 : put_user(retval, &uflowvec->n_flows));
1071 static struct sw_flow *do_dump_flow(struct datapath *dp, u32 __user *state)
1073 struct tbl *table = get_table_protected(dp);
1074 struct tbl_node *tbl_node;
1077 if (get_user(bucket, &state[0]) || get_user(obj, &state[1]))
1078 return ERR_PTR(-EFAULT);
1080 tbl_node = tbl_next(table, &bucket, &obj);
1082 if (put_user(bucket, &state[0]) || put_user(obj, &state[1]))
1083 return ERR_PTR(-EFAULT);
1085 return tbl_node ? flow_cast(tbl_node) : NULL;
1088 static int dump_flow(struct datapath *dp, struct odp_flow_dump __user *udumpp)
1090 struct odp_flow __user *uflowp;
1091 struct sw_flow *flow;
1093 flow = do_dump_flow(dp, udumpp->state);
1095 return PTR_ERR(flow);
1097 if (get_user(uflowp, (struct odp_flow __user *__user*)&udumpp->flow))
1101 return put_user(ODPFF_EOF, &uflowp->flags);
1103 if (copy_to_user(&uflowp->key, &flow->key, sizeof(struct odp_flow_key)) ||
1104 put_user(0, &uflowp->flags))
1106 return answer_query(dp, flow, 0, uflowp);
1109 static int do_execute(struct datapath *dp, const struct odp_execute *execute)
1111 struct odp_flow_key key;
1112 struct sk_buff *skb;
1113 struct sw_flow_actions *actions;
1119 if (execute->length < ETH_HLEN || execute->length > 65535)
1122 actions = flow_actions_alloc(execute->actions_len);
1123 if (IS_ERR(actions)) {
1124 err = PTR_ERR(actions);
1129 if (copy_from_user(actions->actions,
1130 (struct nlattr __user __force *)execute->actions, execute->actions_len))
1131 goto error_free_actions;
1133 err = validate_actions(actions->actions, execute->actions_len);
1135 goto error_free_actions;
1138 skb = alloc_skb(execute->length, GFP_KERNEL);
1140 goto error_free_actions;
1143 if (copy_from_user(skb_put(skb, execute->length),
1144 (const void __user __force *)execute->data,
1146 goto error_free_skb;
1148 skb_reset_mac_header(skb);
1151 /* Normally, setting the skb 'protocol' field would be handled by a
1152 * call to eth_type_trans(), but it assumes there's a sending
1153 * device, which we may not have. */
1154 if (ntohs(eth->h_proto) >= 1536)
1155 skb->protocol = eth->h_proto;
1157 skb->protocol = htons(ETH_P_802_2);
1159 err = flow_extract(skb, -1, &key, &is_frag);
1161 goto error_free_skb;
1164 err = execute_actions(dp, skb, &key, actions->actions, actions->actions_len);
1178 static int execute_packet(struct datapath *dp, const struct odp_execute __user *executep)
1180 struct odp_execute execute;
1182 if (copy_from_user(&execute, executep, sizeof(execute)))
1185 return do_execute(dp, &execute);
1188 static int get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
1190 struct tbl *table = get_table_protected(dp);
1191 struct odp_stats stats;
1194 stats.n_flows = tbl_count(table);
1195 stats.cur_capacity = tbl_n_buckets(table);
1196 stats.max_capacity = TBL_MAX_BUCKETS;
1197 stats.n_ports = dp->n_ports;
1198 stats.max_ports = DP_MAX_PORTS;
1199 stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
1200 for_each_possible_cpu(i) {
1201 const struct dp_stats_percpu *percpu_stats;
1202 struct dp_stats_percpu local_stats;
1205 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
1208 seqcount = read_seqcount_begin(&percpu_stats->seqlock);
1209 local_stats = *percpu_stats;
1210 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
1212 stats.n_frags += local_stats.n_frags;
1213 stats.n_hit += local_stats.n_hit;
1214 stats.n_missed += local_stats.n_missed;
1215 stats.n_lost += local_stats.n_lost;
1217 stats.max_miss_queue = DP_MAX_QUEUE_LEN;
1218 stats.max_action_queue = DP_MAX_QUEUE_LEN;
1219 return copy_to_user(statsp, &stats, sizeof(stats)) ? -EFAULT : 0;
1222 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1223 int dp_min_mtu(const struct datapath *dp)
1230 list_for_each_entry_rcu (p, &dp->port_list, node) {
1233 /* Skip any internal ports, since that's what we're trying to
1235 if (is_internal_vport(p))
1238 dev_mtu = vport_get_mtu(p);
1239 if (!mtu || dev_mtu < mtu)
1243 return mtu ? mtu : ETH_DATA_LEN;
1246 /* Sets the MTU of all datapath devices to the minimum of the ports. Must
1247 * be called with RTNL lock. */
1248 void set_internal_devs_mtu(const struct datapath *dp)
1255 mtu = dp_min_mtu(dp);
1257 list_for_each_entry_rcu (p, &dp->port_list, node) {
1258 if (is_internal_vport(p))
1259 vport_set_mtu(p, mtu);
1263 static int put_port(const struct vport *p, struct odp_port __user *uop)
1267 memset(&op, 0, sizeof(op));
1270 strncpy(op.devname, vport_get_name(p), sizeof(op.devname));
1271 strncpy(op.type, vport_get_type(p), sizeof(op.type));
1272 vport_get_config(p, op.config);
1275 op.port = p->port_no;
1277 return copy_to_user(uop, &op, sizeof(op)) ? -EFAULT : 0;
1280 static int query_port(struct datapath *dp, struct odp_port __user *uport)
1282 struct odp_port port;
1283 struct vport *vport;
1285 if (copy_from_user(&port, uport, sizeof(port)))
1288 if (port.devname[0]) {
1289 port.devname[IFNAMSIZ - 1] = '\0';
1292 vport = vport_locate(port.devname);
1297 if (vport->dp != dp)
1300 if (port.port >= DP_MAX_PORTS)
1303 vport = get_vport_protected(dp, port.port);
1308 return put_port(vport, uport);
1311 static int do_list_ports(struct datapath *dp, struct odp_port __user *uports,
1318 list_for_each_entry_rcu (p, &dp->port_list, node) {
1319 if (put_port(p, &uports[idx]))
1321 if (idx++ >= n_ports)
1328 static int list_ports(struct datapath *dp, struct odp_portvec __user *upv)
1330 struct odp_portvec pv;
1333 if (copy_from_user(&pv, upv, sizeof(pv)))
1336 retval = do_list_ports(dp, (struct odp_port __user __force *)pv.ports,
1341 return put_user(retval, &upv->n_ports);
1344 static int get_listen_mask(const struct file *f)
1346 return (long)f->private_data;
1349 static void set_listen_mask(struct file *f, int listen_mask)
1351 f->private_data = (void*)(long)listen_mask;
1354 static long openvswitch_ioctl(struct file *f, unsigned int cmd,
1357 int dp_idx = iminor(f->f_dentry->d_inode);
1358 struct datapath *dp;
1359 int drop_frags, listeners, port_no;
1360 unsigned int sflow_probability;
1363 /* Handle commands with special locking requirements up front. */
1366 err = create_dp(dp_idx, (char __user *)argp);
1369 case ODP_DP_DESTROY:
1370 err = destroy_dp(dp_idx);
1373 case ODP_VPORT_ATTACH:
1374 err = attach_port(dp_idx, (struct odp_port __user *)argp);
1377 case ODP_VPORT_DETACH:
1378 err = get_user(port_no, (int __user *)argp);
1380 err = detach_port(dp_idx, port_no);
1384 err = vport_user_mod((struct odp_port __user *)argp);
1387 case ODP_VPORT_STATS_GET:
1388 err = vport_user_stats_get((struct odp_vport_stats_req __user *)argp);
1391 case ODP_VPORT_STATS_SET:
1392 err = vport_user_stats_set((struct odp_vport_stats_req __user *)argp);
1395 case ODP_VPORT_ETHER_GET:
1396 err = vport_user_ether_get((struct odp_vport_ether __user *)argp);
1399 case ODP_VPORT_ETHER_SET:
1400 err = vport_user_ether_set((struct odp_vport_ether __user *)argp);
1403 case ODP_VPORT_MTU_GET:
1404 err = vport_user_mtu_get((struct odp_vport_mtu __user *)argp);
1407 case ODP_VPORT_MTU_SET:
1408 err = vport_user_mtu_set((struct odp_vport_mtu __user *)argp);
1412 dp = get_dp_locked(dp_idx);
1419 err = get_dp_stats(dp, (struct odp_stats __user *)argp);
1422 case ODP_GET_DROP_FRAGS:
1423 err = put_user(dp->drop_frags, (int __user *)argp);
1426 case ODP_SET_DROP_FRAGS:
1427 err = get_user(drop_frags, (int __user *)argp);
1431 if (drop_frags != 0 && drop_frags != 1)
1433 dp->drop_frags = drop_frags;
1437 case ODP_GET_LISTEN_MASK:
1438 err = put_user(get_listen_mask(f), (int __user *)argp);
1441 case ODP_SET_LISTEN_MASK:
1442 err = get_user(listeners, (int __user *)argp);
1446 if (listeners & ~ODPL_ALL)
1449 set_listen_mask(f, listeners);
1452 case ODP_GET_SFLOW_PROBABILITY:
1453 err = put_user(dp->sflow_probability, (unsigned int __user *)argp);
1456 case ODP_SET_SFLOW_PROBABILITY:
1457 err = get_user(sflow_probability, (unsigned int __user *)argp);
1459 dp->sflow_probability = sflow_probability;
1462 case ODP_VPORT_QUERY:
1463 err = query_port(dp, (struct odp_port __user *)argp);
1466 case ODP_VPORT_LIST:
1467 err = list_ports(dp, (struct odp_portvec __user *)argp);
1470 case ODP_FLOW_FLUSH:
1471 err = flush_flows(dp);
1475 err = put_flow(dp, (struct odp_flow_put __user *)argp);
1479 err = del_flow(dp, (struct odp_flow __user *)argp);
1483 err = do_flowvec_ioctl(dp, argp, do_query_flows);
1487 err = dump_flow(dp, (struct odp_flow_dump __user *)argp);
1491 err = execute_packet(dp, (struct odp_execute __user *)argp);
1498 mutex_unlock(&dp->mutex);
1503 static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
1506 for (i = 0; i < DP_N_QUEUES; i++) {
1507 if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
1513 #ifdef CONFIG_COMPAT
1514 static int compat_list_ports(struct datapath *dp, struct compat_odp_portvec __user *upv)
1516 struct compat_odp_portvec pv;
1519 if (copy_from_user(&pv, upv, sizeof(pv)))
1522 retval = do_list_ports(dp, compat_ptr(pv.ports), pv.n_ports);
1526 return put_user(retval, &upv->n_ports);
1529 static int compat_get_flow(struct odp_flow *flow, const struct compat_odp_flow __user *compat)
1531 compat_uptr_t actions;
1533 if (!access_ok(VERIFY_READ, compat, sizeof(struct compat_odp_flow)) ||
1534 __copy_from_user(&flow->stats, &compat->stats, sizeof(struct odp_flow_stats)) ||
1535 __copy_from_user(&flow->key, &compat->key, sizeof(struct odp_flow_key)) ||
1536 __get_user(actions, &compat->actions) ||
1537 __get_user(flow->actions_len, &compat->actions_len) ||
1538 __get_user(flow->flags, &compat->flags))
1541 flow->actions = (struct nlattr __force *)compat_ptr(actions);
1545 static int compat_put_flow(struct datapath *dp, struct compat_odp_flow_put __user *ufp)
1547 struct odp_flow_stats stats;
1548 struct odp_flow_put fp;
1551 if (compat_get_flow(&fp.flow, &ufp->flow) ||
1552 get_user(fp.flags, &ufp->flags))
1555 error = do_put_flow(dp, &fp, &stats);
1559 if (copy_to_user(&ufp->flow.stats, &stats,
1560 sizeof(struct odp_flow_stats)))
1566 static int compat_answer_query(struct datapath *dp, struct sw_flow *flow,
1568 struct compat_odp_flow __user *ufp)
1570 compat_uptr_t actions;
1572 if (get_user(actions, &ufp->actions))
1575 return do_answer_query(dp, flow, query_flags, &ufp->stats,
1576 compat_ptr(actions), &ufp->actions_len);
1579 static int compat_del_flow(struct datapath *dp, struct compat_odp_flow __user *ufp)
1581 struct sw_flow *flow;
1585 if (compat_get_flow(&uf, ufp))
1588 flow = do_del_flow(dp, &uf.key);
1590 return PTR_ERR(flow);
1592 error = compat_answer_query(dp, flow, 0, ufp);
1593 flow_deferred_free(flow);
1597 static int compat_query_flows(struct datapath *dp,
1598 struct compat_odp_flow __user *flows,
1601 struct tbl *table = get_table_protected(dp);
1604 for (i = 0; i < n_flows; i++) {
1605 struct compat_odp_flow __user *ufp = &flows[i];
1607 struct tbl_node *flow_node;
1610 if (compat_get_flow(&uf, ufp))
1613 flow_node = tbl_lookup(table, &uf.key, flow_hash(&uf.key), flow_cmp);
1615 error = put_user(ENOENT, &ufp->stats.error);
1617 error = compat_answer_query(dp, flow_cast(flow_node),
1625 static int compat_dump_flow(struct datapath *dp, struct compat_odp_flow_dump __user *udumpp)
1627 struct compat_odp_flow __user *uflowp;
1628 compat_uptr_t compat_ufp;
1629 struct sw_flow *flow;
1631 flow = do_dump_flow(dp, udumpp->state);
1633 return PTR_ERR(flow);
1635 if (get_user(compat_ufp, &udumpp->flow))
1637 uflowp = compat_ptr(compat_ufp);
1640 return put_user(ODPFF_EOF, &uflowp->flags);
1642 if (copy_to_user(&uflowp->key, &flow->key, sizeof(struct odp_flow_key)) ||
1643 put_user(0, &uflowp->flags))
1645 return compat_answer_query(dp, flow, 0, uflowp);
1648 static int compat_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1649 int (*function)(struct datapath *,
1650 struct compat_odp_flow __user *,
1653 struct compat_odp_flowvec __user *uflowvec;
1654 struct compat_odp_flow __user *flows;
1655 struct compat_odp_flowvec flowvec;
1658 uflowvec = compat_ptr(argp);
1659 if (!access_ok(VERIFY_WRITE, uflowvec, sizeof(*uflowvec)) ||
1660 copy_from_user(&flowvec, uflowvec, sizeof(flowvec)))
1663 if (flowvec.n_flows > INT_MAX / sizeof(struct compat_odp_flow))
1666 flows = compat_ptr(flowvec.flows);
1667 if (!access_ok(VERIFY_WRITE, flows,
1668 flowvec.n_flows * sizeof(struct compat_odp_flow)))
1671 retval = function(dp, flows, flowvec.n_flows);
1672 return (retval < 0 ? retval
1673 : retval == flowvec.n_flows ? 0
1674 : put_user(retval, &uflowvec->n_flows));
1677 static int compat_execute(struct datapath *dp, const struct compat_odp_execute __user *uexecute)
1679 struct odp_execute execute;
1680 compat_uptr_t actions;
1683 if (!access_ok(VERIFY_READ, uexecute, sizeof(struct compat_odp_execute)) ||
1684 __get_user(actions, &uexecute->actions) ||
1685 __get_user(execute.actions_len, &uexecute->actions_len) ||
1686 __get_user(data, &uexecute->data) ||
1687 __get_user(execute.length, &uexecute->length))
1690 execute.actions = (struct nlattr __force *)compat_ptr(actions);
1691 execute.data = (const void __force *)compat_ptr(data);
1693 return do_execute(dp, &execute);
1696 static long openvswitch_compat_ioctl(struct file *f, unsigned int cmd, unsigned long argp)
1698 int dp_idx = iminor(f->f_dentry->d_inode);
1699 struct datapath *dp;
1703 case ODP_DP_DESTROY:
1704 case ODP_FLOW_FLUSH:
1705 /* Ioctls that don't need any translation at all. */
1706 return openvswitch_ioctl(f, cmd, argp);
1709 case ODP_VPORT_ATTACH:
1710 case ODP_VPORT_DETACH:
1712 case ODP_VPORT_MTU_SET:
1713 case ODP_VPORT_MTU_GET:
1714 case ODP_VPORT_ETHER_SET:
1715 case ODP_VPORT_ETHER_GET:
1716 case ODP_VPORT_STATS_SET:
1717 case ODP_VPORT_STATS_GET:
1719 case ODP_GET_DROP_FRAGS:
1720 case ODP_SET_DROP_FRAGS:
1721 case ODP_SET_LISTEN_MASK:
1722 case ODP_GET_LISTEN_MASK:
1723 case ODP_SET_SFLOW_PROBABILITY:
1724 case ODP_GET_SFLOW_PROBABILITY:
1725 case ODP_VPORT_QUERY:
1726 /* Ioctls that just need their pointer argument extended. */
1727 return openvswitch_ioctl(f, cmd, (unsigned long)compat_ptr(argp));
1730 dp = get_dp_locked(dp_idx);
1736 case ODP_VPORT_LIST32:
1737 err = compat_list_ports(dp, compat_ptr(argp));
1740 case ODP_FLOW_PUT32:
1741 err = compat_put_flow(dp, compat_ptr(argp));
1744 case ODP_FLOW_DEL32:
1745 err = compat_del_flow(dp, compat_ptr(argp));
1748 case ODP_FLOW_GET32:
1749 err = compat_flowvec_ioctl(dp, argp, compat_query_flows);
1752 case ODP_FLOW_DUMP32:
1753 err = compat_dump_flow(dp, compat_ptr(argp));
1757 err = compat_execute(dp, compat_ptr(argp));
1764 mutex_unlock(&dp->mutex);
1770 /* Unfortunately this function is not exported so this is a verbatim copy
1771 * from net/core/datagram.c in 2.6.30. */
1772 static int skb_copy_and_csum_datagram(const struct sk_buff *skb, int offset,
1773 u8 __user *to, int len,
1776 int start = skb_headlen(skb);
1778 int i, copy = start - offset;
1785 *csump = csum_and_copy_to_user(skb->data + offset, to, copy,
1789 if ((len -= copy) == 0)
1796 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
1799 WARN_ON(start > offset + len);
1801 end = start + skb_shinfo(skb)->frags[i].size;
1802 if ((copy = end - offset) > 0) {
1806 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
1807 struct page *page = frag->page;
1812 csum2 = csum_and_copy_to_user(vaddr +
1819 *csump = csum_block_add(*csump, csum2, pos);
1829 if (skb_shinfo(skb)->frag_list) {
1830 struct sk_buff *list = skb_shinfo(skb)->frag_list;
1832 for (; list; list=list->next) {
1835 WARN_ON(start > offset + len);
1837 end = start + list->len;
1838 if ((copy = end - offset) > 0) {
1842 if (skb_copy_and_csum_datagram(list,
1847 *csump = csum_block_add(*csump, csum2, pos);
1848 if ((len -= copy) == 0)
1864 static ssize_t openvswitch_read(struct file *f, char __user *buf,
1865 size_t nbytes, loff_t *ppos)
1867 int listeners = get_listen_mask(f);
1868 int dp_idx = iminor(f->f_dentry->d_inode);
1869 struct datapath *dp = get_dp_locked(dp_idx);
1870 struct sk_buff *skb;
1871 size_t copy_bytes, tot_copy_bytes;
1877 if (nbytes == 0 || !listeners)
1883 for (i = 0; i < DP_N_QUEUES; i++) {
1884 if (listeners & (1 << i)) {
1885 skb = skb_dequeue(&dp->queues[i]);
1891 if (f->f_flags & O_NONBLOCK) {
1896 wait_event_interruptible(dp->waitqueue,
1897 dp_has_packet_of_interest(dp,
1900 if (signal_pending(current)) {
1901 retval = -ERESTARTSYS;
1906 mutex_unlock(&dp->mutex);
1908 copy_bytes = tot_copy_bytes = min_t(size_t, skb->len, nbytes);
1911 if (skb->ip_summed == CHECKSUM_PARTIAL) {
1912 if (copy_bytes == skb->len) {
1914 u16 csum_start, csum_offset;
1916 get_skb_csum_pointers(skb, &csum_start, &csum_offset);
1917 csum_start -= skb_headroom(skb);
1919 BUG_ON(csum_start >= skb_headlen(skb));
1920 retval = skb_copy_and_csum_datagram(skb, csum_start, buf + csum_start,
1921 copy_bytes - csum_start, &csum);
1923 __sum16 __user *csump;
1925 copy_bytes = csum_start;
1926 csump = (__sum16 __user *)(buf + csum_start + csum_offset);
1928 BUG_ON((char __user *)csump + sizeof(__sum16) >
1930 put_user(csum_fold(csum), csump);
1933 retval = skb_checksum_help(skb);
1940 iov.iov_len = copy_bytes;
1941 retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
1945 retval = tot_copy_bytes;
1951 mutex_unlock(&dp->mutex);
1955 static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
1957 int dp_idx = iminor(file->f_dentry->d_inode);
1958 struct datapath *dp = get_dp_locked(dp_idx);
1963 poll_wait(file, &dp->waitqueue, wait);
1964 if (dp_has_packet_of_interest(dp, get_listen_mask(file)))
1965 mask |= POLLIN | POLLRDNORM;
1966 mutex_unlock(&dp->mutex);
1968 mask = POLLIN | POLLRDNORM | POLLHUP;
1973 static struct file_operations openvswitch_fops = {
1974 .owner = THIS_MODULE,
1975 .read = openvswitch_read,
1976 .poll = openvswitch_poll,
1977 .unlocked_ioctl = openvswitch_ioctl,
1978 #ifdef CONFIG_COMPAT
1979 .compat_ioctl = openvswitch_compat_ioctl,
1985 static int __init dp_init(void)
1987 struct sk_buff *dummy_skb;
1990 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
1992 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2000 goto error_flow_exit;
2002 err = register_netdevice_notifier(&dp_device_notifier);
2004 goto error_vport_exit;
2006 major = register_chrdev(0, "openvswitch", &openvswitch_fops);
2008 goto error_unreg_notifier;
2012 error_unreg_notifier:
2013 unregister_netdevice_notifier(&dp_device_notifier);
2022 static void dp_cleanup(void)
2025 unregister_chrdev(major, "openvswitch");
2026 unregister_netdevice_notifier(&dp_device_notifier);
2031 module_init(dp_init);
2032 module_exit(dp_cleanup);
2034 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2035 MODULE_LICENSE("GPL");