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>
15 #include <linux/if_arp.h>
16 #include <linux/if_vlan.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>
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/openvswitch.h>
43 #include <linux/rculist.h>
44 #include <linux/dmi.h>
45 #include <net/inet_ecn.h>
46 #include <net/genetlink.h>
54 #include "vport-internal_dev.h"
56 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,18) || \
57 LINUX_VERSION_CODE >= KERNEL_VERSION(3,2,0)
58 #error Kernels before 2.6.18 or after 3.1 are not supported by this version of Open vSwitch.
61 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
62 EXPORT_SYMBOL(dp_ioctl_hook);
67 * Writes to device state (add/remove datapath, port, set operations on vports,
68 * etc.) are protected by RTNL.
70 * Writes to other state (flow table modifications, set miscellaneous datapath
71 * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside
74 * Reads are protected by RCU.
76 * There are a few special cases (mostly stats) that have their own
77 * synchronization but they nest under all of above and don't interact with
81 /* Global list of datapaths to enable dumping them all out.
82 * Protected by genl_mutex.
84 static LIST_HEAD(dps);
86 static struct vport *new_vport(const struct vport_parms *);
87 static int queue_gso_packets(int dp_ifindex, struct sk_buff *,
88 const struct dp_upcall_info *);
89 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *,
90 const struct dp_upcall_info *);
92 /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */
93 struct datapath *get_dp(int dp_ifindex)
95 struct datapath *dp = NULL;
96 struct net_device *dev;
99 dev = dev_get_by_index_rcu(&init_net, dp_ifindex);
101 struct vport *vport = internal_dev_get_vport(dev);
109 EXPORT_SYMBOL_GPL(get_dp);
111 /* Must be called with genl_mutex. */
112 static struct flow_table *get_table_protected(struct datapath *dp)
114 return rcu_dereference_protected(dp->table, lockdep_genl_is_held());
117 /* Must be called with rcu_read_lock or RTNL lock. */
118 static struct vport *get_vport_protected(struct datapath *dp, u16 port_no)
120 return rcu_dereference_rtnl(dp->ports[port_no]);
123 /* Must be called with rcu_read_lock or RTNL lock. */
124 const char *dp_name(const struct datapath *dp)
126 return vport_get_name(rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]));
129 static int get_dpifindex(struct datapath *dp)
136 local = get_vport_protected(dp, OVSP_LOCAL);
138 ifindex = vport_get_ifindex(local);
147 static inline size_t br_nlmsg_size(void)
149 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
150 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
151 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
152 + nla_total_size(4) /* IFLA_MASTER */
153 + nla_total_size(4) /* IFLA_MTU */
154 + nla_total_size(1); /* IFLA_OPERSTATE */
157 /* Caller must hold RTNL lock. */
158 static int dp_fill_ifinfo(struct sk_buff *skb,
159 const struct vport *port,
160 int event, unsigned int flags)
162 struct datapath *dp = port->dp;
163 int ifindex = vport_get_ifindex(port);
164 struct ifinfomsg *hdr;
165 struct nlmsghdr *nlh;
170 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
174 hdr = nlmsg_data(nlh);
175 hdr->ifi_family = AF_BRIDGE;
177 hdr->ifi_type = ARPHRD_ETHER;
178 hdr->ifi_index = ifindex;
179 hdr->ifi_flags = vport_get_flags(port);
182 NLA_PUT_STRING(skb, IFLA_IFNAME, vport_get_name(port));
183 NLA_PUT_U32(skb, IFLA_MASTER, get_dpifindex(dp));
184 NLA_PUT_U32(skb, IFLA_MTU, vport_get_mtu(port));
185 #ifdef IFLA_OPERSTATE
186 NLA_PUT_U8(skb, IFLA_OPERSTATE,
187 vport_is_running(port)
188 ? vport_get_operstate(port)
192 NLA_PUT(skb, IFLA_ADDRESS, ETH_ALEN, vport_get_addr(port));
194 return nlmsg_end(skb, nlh);
197 nlmsg_cancel(skb, nlh);
201 /* Caller must hold RTNL lock. */
202 static void dp_ifinfo_notify(int event, struct vport *port)
207 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
211 err = dp_fill_ifinfo(skb, port, event, 0);
213 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
214 WARN_ON(err == -EMSGSIZE);
218 rtnl_notify(skb, &init_net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
222 rtnl_set_sk_err(&init_net, RTNLGRP_LINK, err);
225 static void release_dp(struct kobject *kobj)
227 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
231 static struct kobj_type dp_ktype = {
232 .release = release_dp
235 static void destroy_dp_rcu(struct rcu_head *rcu)
237 struct datapath *dp = container_of(rcu, struct datapath, rcu);
239 flow_tbl_destroy(dp->table);
240 free_percpu(dp->stats_percpu);
241 kobject_put(&dp->ifobj);
244 /* Called with RTNL lock and genl_lock. */
245 static struct vport *new_vport(const struct vport_parms *parms)
249 vport = vport_add(parms);
250 if (!IS_ERR(vport)) {
251 struct datapath *dp = parms->dp;
253 rcu_assign_pointer(dp->ports[parms->port_no], vport);
254 list_add(&vport->node, &dp->port_list);
256 dp_ifinfo_notify(RTM_NEWLINK, vport);
262 /* Called with RTNL lock. */
263 void dp_detach_port(struct vport *p)
267 if (p->port_no != OVSP_LOCAL)
269 dp_ifinfo_notify(RTM_DELLINK, p);
271 /* First drop references to device. */
273 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
275 /* Then destroy it. */
279 /* Must be called with rcu_read_lock. */
280 void dp_process_received_packet(struct vport *p, struct sk_buff *skb)
282 struct datapath *dp = p->dp;
283 struct sw_flow *flow;
284 struct dp_stats_percpu *stats;
288 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
289 OVS_CB(skb)->vport = p;
291 if (!OVS_CB(skb)->flow) {
292 struct sw_flow_key key;
295 /* Extract flow from 'skb' into 'key'. */
296 error = flow_extract(skb, p->port_no, &key, &key_len);
297 if (unlikely(error)) {
303 flow = flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len);
304 if (unlikely(!flow)) {
305 struct dp_upcall_info upcall;
307 upcall.cmd = OVS_PACKET_CMD_MISS;
309 upcall.userdata = NULL;
310 upcall.pid = p->upcall_pid;
311 dp_upcall(dp, skb, &upcall);
313 stats_counter = &stats->n_missed;
317 OVS_CB(skb)->flow = flow;
320 stats_counter = &stats->n_hit;
321 flow_used(OVS_CB(skb)->flow, skb);
322 execute_actions(dp, skb);
325 /* Update datapath statistics. */
327 write_seqcount_begin(&stats->seqlock);
329 write_seqcount_end(&stats->seqlock);
332 static void copy_and_csum_skb(struct sk_buff *skb, void *to)
334 u16 csum_start, csum_offset;
337 get_skb_csum_pointers(skb, &csum_start, &csum_offset);
338 csum_start -= skb_headroom(skb);
340 skb_copy_bits(skb, 0, to, csum_start);
342 csum = skb_copy_and_csum_bits(skb, csum_start, to + csum_start,
343 skb->len - csum_start, 0);
344 *(__sum16 *)(to + csum_start + csum_offset) = csum_fold(csum);
347 static struct genl_family dp_packet_genl_family = {
348 .id = GENL_ID_GENERATE,
349 .hdrsize = sizeof(struct ovs_header),
350 .name = OVS_PACKET_FAMILY,
351 .version = OVS_PACKET_VERSION,
352 .maxattr = OVS_PACKET_ATTR_MAX
355 int dp_upcall(struct datapath *dp, struct sk_buff *skb,
356 const struct dp_upcall_info *upcall_info)
358 struct dp_stats_percpu *stats;
362 if (upcall_info->pid == 0) {
367 dp_ifindex = get_dpifindex(dp);
373 forward_ip_summed(skb, true);
375 if (!skb_is_gso(skb))
376 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
378 err = queue_gso_packets(dp_ifindex, skb, upcall_info);
385 stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id());
387 write_seqcount_begin(&stats->seqlock);
389 write_seqcount_end(&stats->seqlock);
394 static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb,
395 const struct dp_upcall_info *upcall_info)
397 struct dp_upcall_info later_info;
398 struct sw_flow_key later_key;
399 struct sk_buff *segs, *nskb;
402 segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM);
406 /* Queue all of the segments. */
409 err = queue_userspace_packet(dp_ifindex, skb, upcall_info);
413 if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) {
414 /* The initial flow key extracted by flow_extract() in
415 * this case is for a first fragment, so we need to
416 * properly mark later fragments.
418 later_key = *upcall_info->key;
419 later_key.ip.tos_frag &= ~OVS_FRAG_TYPE_MASK;
420 later_key.ip.tos_frag |= OVS_FRAG_TYPE_LATER;
422 later_info = *upcall_info;
423 later_info.key = &later_key;
424 upcall_info = &later_info;
426 } while ((skb = skb->next));
428 /* Free all of the segments. */
436 } while ((skb = nskb));
440 static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb,
441 const struct dp_upcall_info *upcall_info)
443 struct ovs_header *upcall;
444 struct sk_buff *user_skb; /* to be queued to userspace */
449 err = vlan_deaccel_tag(skb);
453 if (nla_attr_size(skb->len) > USHRT_MAX)
456 len = sizeof(struct ovs_header);
457 len += nla_total_size(skb->len);
458 len += nla_total_size(FLOW_BUFSIZE);
459 if (upcall_info->cmd == OVS_PACKET_CMD_ACTION)
460 len += nla_total_size(8);
462 user_skb = genlmsg_new(len, GFP_ATOMIC);
466 upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family,
467 0, upcall_info->cmd);
468 upcall->dp_ifindex = dp_ifindex;
470 nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY);
471 flow_to_nlattrs(upcall_info->key, user_skb);
472 nla_nest_end(user_skb, nla);
474 if (upcall_info->userdata)
475 nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA,
476 nla_get_u64(upcall_info->userdata));
478 nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len);
479 if (skb->ip_summed == CHECKSUM_PARTIAL)
480 copy_and_csum_skb(skb, nla_data(nla));
482 skb_copy_bits(skb, 0, nla_data(nla), skb->len);
484 return genlmsg_unicast(&init_net, user_skb, upcall_info->pid);
487 /* Called with genl_mutex. */
488 static int flush_flows(int dp_ifindex)
490 struct flow_table *old_table;
491 struct flow_table *new_table;
494 dp = get_dp(dp_ifindex);
498 old_table = get_table_protected(dp);
499 new_table = flow_tbl_alloc(TBL_MIN_BUCKETS);
503 rcu_assign_pointer(dp->table, new_table);
505 flow_tbl_deferred_destroy(old_table);
509 static int validate_actions(const struct nlattr *attr,
510 const struct sw_flow_key *key, int depth);
512 static int validate_sample(const struct nlattr *attr,
513 const struct sw_flow_key *key, int depth)
515 const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1];
516 const struct nlattr *probability, *actions;
517 const struct nlattr *a;
520 memset(attrs, 0, sizeof(attrs));
521 nla_for_each_nested (a, attr, rem) {
522 int type = nla_type(a);
523 if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type])
530 probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY];
531 if (!probability || nla_len(probability) != sizeof(u32))
534 actions = attrs[OVS_SAMPLE_ATTR_ACTIONS];
535 if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN))
537 return validate_actions(actions, key, depth + 1);
540 static int validate_action_key(const struct nlattr *a,
541 const struct sw_flow_key *flow_key)
543 int act_type = nla_type(a);
544 const struct nlattr *ovs_key = nla_data(a);
545 int key_type = nla_type(ovs_key);
547 /* There can be only one key in a action */
548 if (nla_total_size(nla_len(ovs_key)) != nla_len(a))
551 if (key_type > OVS_KEY_ATTR_MAX ||
552 nla_len(ovs_key) != ovs_key_lens[key_type])
555 #define ACTION(act, key) (((act) << 8) | (key))
557 switch(ACTION(act_type, key_type)) {
558 const struct ovs_key_ipv4 *ipv4_key;
559 const struct ovs_key_8021q *q_key;
561 case ACTION(OVS_ACTION_ATTR_SET, OVS_KEY_ATTR_TUN_ID):
562 case ACTION(OVS_ACTION_ATTR_SET, OVS_KEY_ATTR_ETHERNET):
565 case ACTION(OVS_ACTION_ATTR_PUSH, OVS_KEY_ATTR_8021Q):
566 q_key = nla_data(ovs_key);
567 if (q_key->q_tpid != htons(ETH_P_8021Q))
570 if (q_key->q_tci & htons(VLAN_TAG_PRESENT))
574 case ACTION(OVS_ACTION_ATTR_SET, OVS_KEY_ATTR_IPV4):
575 if (flow_key->eth.type != htons(ETH_P_IP))
578 if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst)
581 ipv4_key = nla_data(ovs_key);
582 if (ipv4_key->ipv4_proto != flow_key->ip.proto)
585 if (ipv4_key->ipv4_tos & INET_ECN_MASK)
588 if (ipv4_key->ipv4_frag !=
589 (flow_key->ip.tos_frag & OVS_FRAG_TYPE_MASK))
594 case ACTION(OVS_ACTION_ATTR_SET, OVS_KEY_ATTR_TCP):
595 if (flow_key->ip.proto != IPPROTO_TCP)
598 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
603 case ACTION(OVS_ACTION_ATTR_SET, OVS_KEY_ATTR_UDP):
604 if (flow_key->ip.proto != IPPROTO_UDP)
607 if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst)
618 static int validate_userspace(const struct nlattr *attr)
620 static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] =
622 [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 },
623 [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 },
625 struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1];
628 error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, attr, userspace_policy);
632 if (!a[OVS_USERSPACE_ATTR_PID] || !nla_get_u32(a[OVS_USERSPACE_ATTR_PID]))
638 static int validate_actions(const struct nlattr *attr,
639 const struct sw_flow_key *key, int depth)
641 const struct nlattr *a;
644 if (depth >= SAMPLE_ACTION_DEPTH)
647 nla_for_each_nested(a, attr, rem) {
648 /* Expected argument lengths, (u32)-1 for variable length. */
649 static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = {
650 [OVS_ACTION_ATTR_OUTPUT] = 4,
651 [OVS_ACTION_ATTR_USERSPACE] = (u32)-1,
652 [OVS_ACTION_ATTR_PUSH] = (u32)-1,
653 [OVS_ACTION_ATTR_POP] = 2,
654 [OVS_ACTION_ATTR_SET] = (u32)-1,
655 [OVS_ACTION_ATTR_SET_PRIORITY] = 4,
656 [OVS_ACTION_ATTR_POP_PRIORITY] = 0,
657 [OVS_ACTION_ATTR_SAMPLE] = (u32)-1
659 int type = nla_type(a);
661 if (type > OVS_ACTION_ATTR_MAX ||
662 (action_lens[type] != nla_len(a) &&
663 action_lens[type] != (u32)-1))
667 case OVS_ACTION_ATTR_UNSPEC:
670 case OVS_ACTION_ATTR_SET_PRIORITY:
671 case OVS_ACTION_ATTR_POP_PRIORITY:
672 /* No validation needed. */
675 case OVS_ACTION_ATTR_USERSPACE:
676 err = validate_userspace(a);
681 case OVS_ACTION_ATTR_OUTPUT:
682 if (nla_get_u32(a) >= DP_MAX_PORTS)
687 case OVS_ACTION_ATTR_POP:
688 if (nla_get_u16(a) != OVS_KEY_ATTR_8021Q)
692 case OVS_ACTION_ATTR_SET:
693 case OVS_ACTION_ATTR_PUSH:
694 err = validate_action_key(a, key);
699 case OVS_ACTION_ATTR_SAMPLE:
700 err = validate_sample(a, key, depth);
716 static void clear_stats(struct sw_flow *flow)
720 flow->packet_count = 0;
721 flow->byte_count = 0;
724 static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
726 struct ovs_header *ovs_header = info->userhdr;
727 struct nlattr **a = info->attrs;
728 struct sw_flow_actions *acts;
729 struct sk_buff *packet;
730 struct sw_flow *flow;
738 if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
739 !a[OVS_PACKET_ATTR_ACTIONS] ||
740 nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN)
743 len = nla_len(a[OVS_PACKET_ATTR_PACKET]);
744 packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
748 skb_reserve(packet, NET_IP_ALIGN);
750 memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len);
752 skb_reset_mac_header(packet);
753 eth = eth_hdr(packet);
755 /* Normally, setting the skb 'protocol' field would be handled by a
756 * call to eth_type_trans(), but it assumes there's a sending
757 * device, which we may not have. */
758 if (ntohs(eth->h_proto) >= 1536)
759 packet->protocol = eth->h_proto;
761 packet->protocol = htons(ETH_P_802_2);
763 /* Build an sw_flow for sending this packet. */
769 err = flow_extract(packet, -1, &flow->key, &key_len);
773 err = flow_metadata_from_nlattrs(&flow->key.eth.in_port,
774 &flow->key.eth.tun_id,
775 a[OVS_PACKET_ATTR_KEY]);
779 err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0);
783 flow->hash = flow_hash(&flow->key, key_len);
785 acts = flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]);
789 rcu_assign_pointer(flow->sf_acts, acts);
791 OVS_CB(packet)->flow = flow;
794 dp = get_dp(ovs_header->dp_ifindex);
799 if (flow->key.eth.in_port < DP_MAX_PORTS)
800 OVS_CB(packet)->vport = get_vport_protected(dp,
801 flow->key.eth.in_port);
804 err = execute_actions(dp, packet);
821 static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
822 [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC },
823 [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
824 [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
827 static struct genl_ops dp_packet_genl_ops[] = {
828 { .cmd = OVS_PACKET_CMD_EXECUTE,
829 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
830 .policy = packet_policy,
831 .doit = ovs_packet_cmd_execute
835 static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats)
838 struct flow_table *table = get_table_protected(dp);
840 stats->n_flows = flow_tbl_count(table);
842 stats->n_hit = stats->n_missed = stats->n_lost = 0;
843 for_each_possible_cpu(i) {
844 const struct dp_stats_percpu *percpu_stats;
845 struct dp_stats_percpu local_stats;
848 percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
851 seqcount = read_seqcount_begin(&percpu_stats->seqlock);
852 local_stats = *percpu_stats;
853 } while (read_seqcount_retry(&percpu_stats->seqlock, seqcount));
855 stats->n_hit += local_stats.n_hit;
856 stats->n_missed += local_stats.n_missed;
857 stats->n_lost += local_stats.n_lost;
861 static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
862 [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
863 [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
864 [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
867 static struct genl_family dp_flow_genl_family = {
868 .id = GENL_ID_GENERATE,
869 .hdrsize = sizeof(struct ovs_header),
870 .name = OVS_FLOW_FAMILY,
871 .version = OVS_FLOW_VERSION,
872 .maxattr = OVS_FLOW_ATTR_MAX
875 static struct genl_multicast_group dp_flow_multicast_group = {
876 .name = OVS_FLOW_MCGROUP
879 /* Called with genl_lock. */
880 static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp,
881 struct sk_buff *skb, u32 pid, u32 seq, u32 flags, u8 cmd)
883 const int skb_orig_len = skb->len;
884 const struct sw_flow_actions *sf_acts;
885 struct ovs_flow_stats stats;
886 struct ovs_header *ovs_header;
892 sf_acts = rcu_dereference_protected(flow->sf_acts,
893 lockdep_genl_is_held());
895 ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd);
899 ovs_header->dp_ifindex = get_dpifindex(dp);
901 nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY);
903 goto nla_put_failure;
904 err = flow_to_nlattrs(&flow->key, skb);
907 nla_nest_end(skb, nla);
909 spin_lock_bh(&flow->lock);
911 stats.n_packets = flow->packet_count;
912 stats.n_bytes = flow->byte_count;
913 tcp_flags = flow->tcp_flags;
914 spin_unlock_bh(&flow->lock);
917 NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, flow_used_time(used));
920 NLA_PUT(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats);
923 NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags);
925 /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
926 * this is the first flow to be dumped into 'skb'. This is unusual for
927 * Netlink but individual action lists can be longer than
928 * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
929 * The userspace caller can always fetch the actions separately if it
930 * really wants them. (Most userspace callers in fact don't care.)
932 * This can only fail for dump operations because the skb is always
933 * properly sized for single flows.
935 err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len,
937 if (err < 0 && skb_orig_len)
940 return genlmsg_end(skb, ovs_header);
945 genlmsg_cancel(skb, ovs_header);
949 static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow)
951 const struct sw_flow_actions *sf_acts;
954 sf_acts = rcu_dereference_protected(flow->sf_acts,
955 lockdep_genl_is_held());
957 len = nla_total_size(FLOW_BUFSIZE); /* OVS_FLOW_ATTR_KEY */
958 len += nla_total_size(sf_acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */
959 len += nla_total_size(sizeof(struct ovs_flow_stats)); /* OVS_FLOW_ATTR_STATS */
960 len += nla_total_size(1); /* OVS_FLOW_ATTR_TCP_FLAGS */
961 len += nla_total_size(8); /* OVS_FLOW_ATTR_USED */
962 return genlmsg_new(NLMSG_ALIGN(sizeof(struct ovs_header)) + len, GFP_KERNEL);
965 static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, struct datapath *dp,
966 u32 pid, u32 seq, u8 cmd)
971 skb = ovs_flow_cmd_alloc_info(flow);
973 return ERR_PTR(-ENOMEM);
975 retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd);
980 static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info)
982 struct nlattr **a = info->attrs;
983 struct ovs_header *ovs_header = info->userhdr;
984 struct sw_flow_key key;
985 struct sw_flow *flow;
986 struct sk_buff *reply;
988 struct flow_table *table;
994 if (!a[OVS_FLOW_ATTR_KEY])
996 error = flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1000 /* Validate actions. */
1001 if (a[OVS_FLOW_ATTR_ACTIONS]) {
1002 error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0);
1005 } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) {
1010 dp = get_dp(ovs_header->dp_ifindex);
1015 table = get_table_protected(dp);
1016 flow = flow_tbl_lookup(table, &key, key_len);
1018 struct sw_flow_actions *acts;
1020 /* Bail out if we're not allowed to create a new flow. */
1022 if (info->genlhdr->cmd == OVS_FLOW_CMD_SET)
1025 /* Expand table, if necessary, to make room. */
1026 if (flow_tbl_need_to_expand(table)) {
1027 struct flow_table *new_table;
1029 new_table = flow_tbl_expand(table);
1030 if (!IS_ERR(new_table)) {
1031 rcu_assign_pointer(dp->table, new_table);
1032 flow_tbl_deferred_destroy(table);
1033 table = get_table_protected(dp);
1037 /* Allocate flow. */
1038 flow = flow_alloc();
1040 error = PTR_ERR(flow);
1046 /* Obtain actions. */
1047 acts = flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
1048 error = PTR_ERR(acts);
1050 goto error_free_flow;
1051 rcu_assign_pointer(flow->sf_acts, acts);
1053 /* Put flow in bucket. */
1054 flow->hash = flow_hash(&key, key_len);
1055 flow_tbl_insert(table, flow);
1057 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1058 info->snd_seq, OVS_FLOW_CMD_NEW);
1060 /* We found a matching flow. */
1061 struct sw_flow_actions *old_acts;
1063 /* Bail out if we're not allowed to modify an existing flow.
1064 * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1065 * because Generic Netlink treats the latter as a dump
1066 * request. We also accept NLM_F_EXCL in case that bug ever
1070 if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW &&
1071 info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL))
1074 /* Update actions. */
1075 old_acts = rcu_dereference_protected(flow->sf_acts,
1076 lockdep_genl_is_held());
1077 if (a[OVS_FLOW_ATTR_ACTIONS] &&
1078 (old_acts->actions_len != nla_len(a[OVS_FLOW_ATTR_ACTIONS]) ||
1079 memcmp(old_acts->actions, nla_data(a[OVS_FLOW_ATTR_ACTIONS]),
1080 old_acts->actions_len))) {
1081 struct sw_flow_actions *new_acts;
1083 new_acts = flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]);
1084 error = PTR_ERR(new_acts);
1085 if (IS_ERR(new_acts))
1088 rcu_assign_pointer(flow->sf_acts, new_acts);
1089 flow_deferred_free_acts(old_acts);
1092 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid,
1093 info->snd_seq, OVS_FLOW_CMD_NEW);
1096 if (a[OVS_FLOW_ATTR_CLEAR]) {
1097 spin_lock_bh(&flow->lock);
1099 spin_unlock_bh(&flow->lock);
1104 genl_notify(reply, genl_info_net(info), info->snd_pid,
1105 dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1107 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1108 dp_flow_multicast_group.id, PTR_ERR(reply));
1117 static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1119 struct nlattr **a = info->attrs;
1120 struct ovs_header *ovs_header = info->userhdr;
1121 struct sw_flow_key key;
1122 struct sk_buff *reply;
1123 struct sw_flow *flow;
1124 struct datapath *dp;
1125 struct flow_table *table;
1129 if (!a[OVS_FLOW_ATTR_KEY])
1131 err = flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1135 dp = get_dp(ovs_header->dp_ifindex);
1139 table = get_table_protected(dp);
1140 flow = flow_tbl_lookup(table, &key, key_len);
1144 reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, info->snd_seq, OVS_FLOW_CMD_NEW);
1146 return PTR_ERR(reply);
1148 return genlmsg_reply(reply, info);
1151 static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1153 struct nlattr **a = info->attrs;
1154 struct ovs_header *ovs_header = info->userhdr;
1155 struct sw_flow_key key;
1156 struct sk_buff *reply;
1157 struct sw_flow *flow;
1158 struct datapath *dp;
1159 struct flow_table *table;
1163 if (!a[OVS_FLOW_ATTR_KEY])
1164 return flush_flows(ovs_header->dp_ifindex);
1165 err = flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]);
1169 dp = get_dp(ovs_header->dp_ifindex);
1173 table = get_table_protected(dp);
1174 flow = flow_tbl_lookup(table, &key, key_len);
1178 reply = ovs_flow_cmd_alloc_info(flow);
1182 flow_tbl_remove(table, flow);
1184 err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid,
1185 info->snd_seq, 0, OVS_FLOW_CMD_DEL);
1188 flow_deferred_free(flow);
1190 genl_notify(reply, genl_info_net(info), info->snd_pid,
1191 dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL);
1195 static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1197 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1198 struct datapath *dp;
1200 dp = get_dp(ovs_header->dp_ifindex);
1205 struct sw_flow *flow;
1208 bucket = cb->args[0];
1210 flow = flow_tbl_next(get_table_protected(dp), &bucket, &obj);
1214 if (ovs_flow_cmd_fill_info(flow, dp, skb, NETLINK_CB(cb->skb).pid,
1215 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1216 OVS_FLOW_CMD_NEW) < 0)
1219 cb->args[0] = bucket;
1225 static struct genl_ops dp_flow_genl_ops[] = {
1226 { .cmd = OVS_FLOW_CMD_NEW,
1227 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1228 .policy = flow_policy,
1229 .doit = ovs_flow_cmd_new_or_set
1231 { .cmd = OVS_FLOW_CMD_DEL,
1232 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1233 .policy = flow_policy,
1234 .doit = ovs_flow_cmd_del
1236 { .cmd = OVS_FLOW_CMD_GET,
1237 .flags = 0, /* OK for unprivileged users. */
1238 .policy = flow_policy,
1239 .doit = ovs_flow_cmd_get,
1240 .dumpit = ovs_flow_cmd_dump
1242 { .cmd = OVS_FLOW_CMD_SET,
1243 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1244 .policy = flow_policy,
1245 .doit = ovs_flow_cmd_new_or_set,
1249 static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
1250 #ifdef HAVE_NLA_NUL_STRING
1251 [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1253 [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1256 static struct genl_family dp_datapath_genl_family = {
1257 .id = GENL_ID_GENERATE,
1258 .hdrsize = sizeof(struct ovs_header),
1259 .name = OVS_DATAPATH_FAMILY,
1260 .version = OVS_DATAPATH_VERSION,
1261 .maxattr = OVS_DP_ATTR_MAX
1264 static struct genl_multicast_group dp_datapath_multicast_group = {
1265 .name = OVS_DATAPATH_MCGROUP
1268 static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1269 u32 pid, u32 seq, u32 flags, u8 cmd)
1271 struct ovs_header *ovs_header;
1275 ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family,
1280 ovs_header->dp_ifindex = get_dpifindex(dp);
1283 err = nla_put_string(skb, OVS_DP_ATTR_NAME, dp_name(dp));
1286 goto nla_put_failure;
1288 nla = nla_reserve(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats));
1290 goto nla_put_failure;
1291 get_dp_stats(dp, nla_data(nla));
1293 return genlmsg_end(skb, ovs_header);
1296 genlmsg_cancel(skb, ovs_header);
1301 static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid,
1304 struct sk_buff *skb;
1307 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1309 return ERR_PTR(-ENOMEM);
1311 retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd);
1314 return ERR_PTR(retval);
1319 static int ovs_dp_cmd_validate(struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1321 return CHECK_NUL_STRING(a[OVS_DP_ATTR_NAME], IFNAMSIZ - 1);
1324 /* Called with genl_mutex and optionally with RTNL lock also. */
1325 static struct datapath *lookup_datapath(struct ovs_header *ovs_header, struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1327 struct datapath *dp;
1329 if (!a[OVS_DP_ATTR_NAME])
1330 dp = get_dp(ovs_header->dp_ifindex);
1332 struct vport *vport;
1335 vport = vport_locate(nla_data(a[OVS_DP_ATTR_NAME]));
1336 dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1339 return dp ? dp : ERR_PTR(-ENODEV);
1342 static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1344 struct nlattr **a = info->attrs;
1345 struct vport_parms parms;
1346 struct sk_buff *reply;
1347 struct datapath *dp;
1348 struct vport *vport;
1352 if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1355 err = ovs_dp_cmd_validate(a);
1361 if (!try_module_get(THIS_MODULE))
1362 goto err_unlock_rtnl;
1365 dp = kzalloc(sizeof(*dp), GFP_KERNEL);
1367 goto err_put_module;
1368 INIT_LIST_HEAD(&dp->port_list);
1370 /* Initialize kobject for bridge. This will be added as
1371 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
1372 dp->ifobj.kset = NULL;
1373 kobject_init(&dp->ifobj, &dp_ktype);
1375 /* Allocate table. */
1377 rcu_assign_pointer(dp->table, flow_tbl_alloc(TBL_MIN_BUCKETS));
1381 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
1382 if (!dp->stats_percpu) {
1384 goto err_destroy_table;
1387 /* Set up our datapath device. */
1388 parms.name = nla_data(a[OVS_DP_ATTR_NAME]);
1389 parms.type = OVS_VPORT_TYPE_INTERNAL;
1390 parms.options = NULL;
1392 parms.port_no = OVSP_LOCAL;
1393 parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]);
1395 vport = new_vport(&parms);
1396 if (IS_ERR(vport)) {
1397 err = PTR_ERR(vport);
1401 goto err_destroy_percpu;
1404 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_NEW);
1405 err = PTR_ERR(reply);
1407 goto err_destroy_local_port;
1409 list_add_tail(&dp->list_node, &dps);
1410 dp_sysfs_add_dp(dp);
1414 genl_notify(reply, genl_info_net(info), info->snd_pid,
1415 dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1418 err_destroy_local_port:
1419 dp_detach_port(get_vport_protected(dp, OVSP_LOCAL));
1421 free_percpu(dp->stats_percpu);
1423 flow_tbl_destroy(get_table_protected(dp));
1427 module_put(THIS_MODULE);
1434 static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1436 struct vport *vport, *next_vport;
1437 struct sk_buff *reply;
1438 struct datapath *dp;
1441 err = ovs_dp_cmd_validate(info->attrs);
1446 dp = lookup_datapath(info->userhdr, info->attrs);
1451 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_DEL);
1452 err = PTR_ERR(reply);
1456 list_for_each_entry_safe (vport, next_vport, &dp->port_list, node)
1457 if (vport->port_no != OVSP_LOCAL)
1458 dp_detach_port(vport);
1460 dp_sysfs_del_dp(dp);
1461 list_del(&dp->list_node);
1462 dp_detach_port(get_vport_protected(dp, OVSP_LOCAL));
1464 /* rtnl_unlock() will wait until all the references to devices that
1465 * are pending unregistration have been dropped. We do it here to
1466 * ensure that any internal devices (which contain DP pointers) are
1467 * fully destroyed before freeing the datapath.
1471 call_rcu(&dp->rcu, destroy_dp_rcu);
1472 module_put(THIS_MODULE);
1474 genl_notify(reply, genl_info_net(info), info->snd_pid,
1475 dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1485 static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1487 struct sk_buff *reply;
1488 struct datapath *dp;
1491 err = ovs_dp_cmd_validate(info->attrs);
1495 dp = lookup_datapath(info->userhdr, info->attrs);
1499 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_NEW);
1500 if (IS_ERR(reply)) {
1501 err = PTR_ERR(reply);
1502 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1503 dp_datapath_multicast_group.id, err);
1507 genl_notify(reply, genl_info_net(info), info->snd_pid,
1508 dp_datapath_multicast_group.id, info->nlhdr, GFP_KERNEL);
1512 static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1514 struct sk_buff *reply;
1515 struct datapath *dp;
1518 err = ovs_dp_cmd_validate(info->attrs);
1522 dp = lookup_datapath(info->userhdr, info->attrs);
1526 reply = ovs_dp_cmd_build_info(dp, info->snd_pid, info->snd_seq, OVS_DP_CMD_NEW);
1528 return PTR_ERR(reply);
1530 return genlmsg_reply(reply, info);
1533 static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1535 struct datapath *dp;
1536 int skip = cb->args[0];
1539 list_for_each_entry (dp, &dps, list_node) {
1542 if (ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid,
1543 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1544 OVS_DP_CMD_NEW) < 0)
1554 static struct genl_ops dp_datapath_genl_ops[] = {
1555 { .cmd = OVS_DP_CMD_NEW,
1556 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1557 .policy = datapath_policy,
1558 .doit = ovs_dp_cmd_new
1560 { .cmd = OVS_DP_CMD_DEL,
1561 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1562 .policy = datapath_policy,
1563 .doit = ovs_dp_cmd_del
1565 { .cmd = OVS_DP_CMD_GET,
1566 .flags = 0, /* OK for unprivileged users. */
1567 .policy = datapath_policy,
1568 .doit = ovs_dp_cmd_get,
1569 .dumpit = ovs_dp_cmd_dump
1571 { .cmd = OVS_DP_CMD_SET,
1572 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1573 .policy = datapath_policy,
1574 .doit = ovs_dp_cmd_set,
1578 static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
1579 #ifdef HAVE_NLA_NUL_STRING
1580 [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
1581 [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
1582 [OVS_VPORT_ATTR_ADDRESS] = { .len = ETH_ALEN },
1584 [OVS_VPORT_ATTR_STATS] = { .minlen = sizeof(struct ovs_vport_stats) },
1585 [OVS_VPORT_ATTR_ADDRESS] = { .minlen = ETH_ALEN },
1587 [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
1588 [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
1589 [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 },
1590 [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
1593 static struct genl_family dp_vport_genl_family = {
1594 .id = GENL_ID_GENERATE,
1595 .hdrsize = sizeof(struct ovs_header),
1596 .name = OVS_VPORT_FAMILY,
1597 .version = OVS_VPORT_VERSION,
1598 .maxattr = OVS_VPORT_ATTR_MAX
1601 struct genl_multicast_group dp_vport_multicast_group = {
1602 .name = OVS_VPORT_MCGROUP
1605 /* Called with RTNL lock or RCU read lock. */
1606 static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
1607 u32 pid, u32 seq, u32 flags, u8 cmd)
1609 struct ovs_header *ovs_header;
1613 ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family,
1618 ovs_header->dp_ifindex = get_dpifindex(vport->dp);
1620 NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no);
1621 NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport_get_type(vport));
1622 NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport_get_name(vport));
1623 NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid);
1625 nla = nla_reserve(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats));
1627 goto nla_put_failure;
1629 vport_get_stats(vport, nla_data(nla));
1631 NLA_PUT(skb, OVS_VPORT_ATTR_ADDRESS, ETH_ALEN, vport_get_addr(vport));
1633 err = vport_get_options(vport, skb);
1634 if (err == -EMSGSIZE)
1637 return genlmsg_end(skb, ovs_header);
1642 genlmsg_cancel(skb, ovs_header);
1646 /* Called with RTNL lock or RCU read lock. */
1647 struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid,
1650 struct sk_buff *skb;
1653 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1655 return ERR_PTR(-ENOMEM);
1657 retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd);
1660 return ERR_PTR(retval);
1665 static int ovs_vport_cmd_validate(struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1667 return CHECK_NUL_STRING(a[OVS_VPORT_ATTR_NAME], IFNAMSIZ - 1);
1670 /* Called with RTNL lock or RCU read lock. */
1671 static struct vport *lookup_vport(struct ovs_header *ovs_header,
1672 struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1674 struct datapath *dp;
1675 struct vport *vport;
1677 if (a[OVS_VPORT_ATTR_NAME]) {
1678 vport = vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME]));
1680 return ERR_PTR(-ENODEV);
1682 } else if (a[OVS_VPORT_ATTR_PORT_NO]) {
1683 u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1685 if (port_no >= DP_MAX_PORTS)
1686 return ERR_PTR(-EFBIG);
1688 dp = get_dp(ovs_header->dp_ifindex);
1690 return ERR_PTR(-ENODEV);
1692 vport = get_vport_protected(dp, port_no);
1694 return ERR_PTR(-ENOENT);
1697 return ERR_PTR(-EINVAL);
1700 /* Called with RTNL lock. */
1701 static int change_vport(struct vport *vport, struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
1705 if (a[OVS_VPORT_ATTR_STATS])
1706 vport_set_stats(vport, nla_data(a[OVS_VPORT_ATTR_STATS]));
1708 if (a[OVS_VPORT_ATTR_ADDRESS])
1709 err = vport_set_addr(vport, nla_data(a[OVS_VPORT_ATTR_ADDRESS]));
1714 static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
1716 struct nlattr **a = info->attrs;
1717 struct ovs_header *ovs_header = info->userhdr;
1718 struct vport_parms parms;
1719 struct sk_buff *reply;
1720 struct vport *vport;
1721 struct datapath *dp;
1726 if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
1727 !a[OVS_VPORT_ATTR_UPCALL_PID])
1730 err = ovs_vport_cmd_validate(a);
1735 dp = get_dp(ovs_header->dp_ifindex);
1740 if (a[OVS_VPORT_ATTR_PORT_NO]) {
1741 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]);
1744 if (port_no >= DP_MAX_PORTS)
1747 vport = get_vport_protected(dp, port_no);
1752 for (port_no = 1; ; port_no++) {
1753 if (port_no >= DP_MAX_PORTS) {
1757 vport = get_vport_protected(dp, port_no);
1763 parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]);
1764 parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]);
1765 parms.options = a[OVS_VPORT_ATTR_OPTIONS];
1767 parms.port_no = port_no;
1768 parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1770 vport = new_vport(&parms);
1771 err = PTR_ERR(vport);
1775 dp_sysfs_add_if(vport);
1777 err = change_vport(vport, a);
1779 reply = ovs_vport_cmd_build_info(vport, info->snd_pid,
1780 info->snd_seq, OVS_VPORT_CMD_NEW);
1782 err = PTR_ERR(reply);
1785 dp_detach_port(vport);
1788 genl_notify(reply, genl_info_net(info), info->snd_pid,
1789 dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1798 static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
1800 struct nlattr **a = info->attrs;
1801 struct sk_buff *reply;
1802 struct vport *vport;
1805 err = ovs_vport_cmd_validate(a);
1810 vport = lookup_vport(info->userhdr, a);
1811 err = PTR_ERR(vport);
1816 if (a[OVS_VPORT_ATTR_TYPE] && nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport_get_type(vport))
1818 if (!err && a[OVS_VPORT_ATTR_OPTIONS])
1819 err = vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]);
1821 err = change_vport(vport, a);
1822 if (!err && a[OVS_VPORT_ATTR_UPCALL_PID])
1823 vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]);
1825 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1827 if (IS_ERR(reply)) {
1828 err = PTR_ERR(reply);
1829 netlink_set_err(INIT_NET_GENL_SOCK, 0,
1830 dp_vport_multicast_group.id, err);
1834 genl_notify(reply, genl_info_net(info), info->snd_pid,
1835 dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1843 static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
1845 struct nlattr **a = info->attrs;
1846 struct sk_buff *reply;
1847 struct vport *vport;
1850 err = ovs_vport_cmd_validate(a);
1855 vport = lookup_vport(info->userhdr, a);
1856 err = PTR_ERR(vport);
1860 if (vport->port_no == OVSP_LOCAL) {
1865 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1867 err = PTR_ERR(reply);
1871 dp_detach_port(vport);
1873 genl_notify(reply, genl_info_net(info), info->snd_pid,
1874 dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL);
1882 static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
1884 struct nlattr **a = info->attrs;
1885 struct ovs_header *ovs_header = info->userhdr;
1886 struct sk_buff *reply;
1887 struct vport *vport;
1890 err = ovs_vport_cmd_validate(a);
1895 vport = lookup_vport(ovs_header, a);
1896 err = PTR_ERR(vport);
1900 reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq,
1902 err = PTR_ERR(reply);
1908 return genlmsg_reply(reply, info);
1916 static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1918 struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh));
1919 struct datapath *dp;
1923 dp = get_dp(ovs_header->dp_ifindex);
1928 for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) {
1929 struct vport *vport;
1931 vport = get_vport_protected(dp, port_no);
1935 if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid,
1936 cb->nlh->nlmsg_seq, NLM_F_MULTI,
1937 OVS_VPORT_CMD_NEW) < 0)
1942 cb->args[0] = port_no;
1948 static struct genl_ops dp_vport_genl_ops[] = {
1949 { .cmd = OVS_VPORT_CMD_NEW,
1950 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1951 .policy = vport_policy,
1952 .doit = ovs_vport_cmd_new
1954 { .cmd = OVS_VPORT_CMD_DEL,
1955 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1956 .policy = vport_policy,
1957 .doit = ovs_vport_cmd_del
1959 { .cmd = OVS_VPORT_CMD_GET,
1960 .flags = 0, /* OK for unprivileged users. */
1961 .policy = vport_policy,
1962 .doit = ovs_vport_cmd_get,
1963 .dumpit = ovs_vport_cmd_dump
1965 { .cmd = OVS_VPORT_CMD_SET,
1966 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1967 .policy = vport_policy,
1968 .doit = ovs_vport_cmd_set,
1972 struct genl_family_and_ops {
1973 struct genl_family *family;
1974 struct genl_ops *ops;
1976 struct genl_multicast_group *group;
1979 static const struct genl_family_and_ops dp_genl_families[] = {
1980 { &dp_datapath_genl_family,
1981 dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops),
1982 &dp_datapath_multicast_group },
1983 { &dp_vport_genl_family,
1984 dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops),
1985 &dp_vport_multicast_group },
1986 { &dp_flow_genl_family,
1987 dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops),
1988 &dp_flow_multicast_group },
1989 { &dp_packet_genl_family,
1990 dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops),
1994 static void dp_unregister_genl(int n_families)
1998 for (i = 0; i < n_families; i++)
1999 genl_unregister_family(dp_genl_families[i].family);
2002 static int dp_register_genl(void)
2009 for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2010 const struct genl_family_and_ops *f = &dp_genl_families[i];
2012 err = genl_register_family_with_ops(f->family, f->ops,
2019 err = genl_register_mc_group(f->family, f->group);
2028 dp_unregister_genl(n_registered);
2032 static int __init dp_init(void)
2034 struct sk_buff *dummy_skb;
2037 BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb));
2039 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
2047 goto error_tnl_exit;
2051 goto error_flow_exit;
2053 err = register_netdevice_notifier(&dp_device_notifier);
2055 goto error_vport_exit;
2057 err = dp_register_genl();
2059 goto error_unreg_notifier;
2063 error_unreg_notifier:
2064 unregister_netdevice_notifier(&dp_device_notifier);
2075 static void dp_cleanup(void)
2078 dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2079 unregister_netdevice_notifier(&dp_device_notifier);
2085 module_init(dp_init);
2086 module_exit(dp_cleanup);
2088 MODULE_DESCRIPTION("Open vSwitch switching datapath");
2089 MODULE_LICENSE("GPL");