2 * Copyright (c) 2007, 2008, 2009 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 #include <linux/init.h>
12 #include <linux/module.h>
14 #include <linux/if_arp.h>
15 #include <linux/if_bridge.h>
16 #include <linux/if_vlan.h>
19 #include <linux/delay.h>
20 #include <linux/time.h>
21 #include <linux/etherdevice.h>
22 #include <linux/kernel.h>
23 #include <linux/kthread.h>
24 #include <linux/llc.h>
25 #include <linux/mutex.h>
26 #include <linux/percpu.h>
27 #include <linux/rcupdate.h>
28 #include <linux/tcp.h>
29 #include <linux/udp.h>
30 #include <linux/version.h>
31 #include <linux/ethtool.h>
32 #include <linux/random.h>
33 #include <linux/wait.h>
34 #include <asm/system.h>
35 #include <asm/div64.h>
37 #include <linux/netfilter_bridge.h>
38 #include <linux/netfilter_ipv4.h>
39 #include <linux/inetdevice.h>
40 #include <linux/list.h>
41 #include <linux/rculist.h>
42 #include <linux/workqueue.h>
43 #include <linux/dmi.h>
46 #include "openvswitch/datapath-protocol.h"
55 int (*dp_ioctl_hook)(struct net_device *dev, struct ifreq *rq, int cmd);
56 EXPORT_SYMBOL(dp_ioctl_hook);
58 /* Datapaths. Protected on the read side by rcu_read_lock, on the write side
61 * dp_mutex nests inside the RTNL lock: if you need both you must take the RTNL
64 * It is safe to access the datapath and net_bridge_port structures with just
67 static struct datapath *dps[ODP_MAX];
68 static DEFINE_MUTEX(dp_mutex);
70 /* Number of milliseconds between runs of the maintenance thread. */
71 #define MAINT_SLEEP_MSECS 1000
73 static int new_nbp(struct datapath *, struct net_device *, int port_no);
75 /* Must be called with rcu_read_lock or dp_mutex. */
76 struct datapath *get_dp(int dp_idx)
78 if (dp_idx < 0 || dp_idx >= ODP_MAX)
80 return rcu_dereference(dps[dp_idx]);
82 EXPORT_SYMBOL_GPL(get_dp);
84 struct datapath *get_dp_locked(int dp_idx)
88 mutex_lock(&dp_mutex);
91 mutex_lock(&dp->mutex);
92 mutex_unlock(&dp_mutex);
96 static inline size_t br_nlmsg_size(void)
98 return NLMSG_ALIGN(sizeof(struct ifinfomsg))
99 + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */
100 + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */
101 + nla_total_size(4) /* IFLA_MASTER */
102 + nla_total_size(4) /* IFLA_MTU */
103 + nla_total_size(4) /* IFLA_LINK */
104 + nla_total_size(1); /* IFLA_OPERSTATE */
107 static int dp_fill_ifinfo(struct sk_buff *skb,
108 const struct net_bridge_port *port,
109 int event, unsigned int flags)
111 const struct datapath *dp = port->dp;
112 const struct net_device *dev = port->dev;
113 struct ifinfomsg *hdr;
114 struct nlmsghdr *nlh;
116 nlh = nlmsg_put(skb, 0, 0, event, sizeof(*hdr), flags);
120 hdr = nlmsg_data(nlh);
121 hdr->ifi_family = AF_BRIDGE;
123 hdr->ifi_type = dev->type;
124 hdr->ifi_index = dev->ifindex;
125 hdr->ifi_flags = dev_get_flags(dev);
128 NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name);
129 NLA_PUT_U32(skb, IFLA_MASTER, dp->ports[ODPP_LOCAL]->dev->ifindex);
130 NLA_PUT_U32(skb, IFLA_MTU, dev->mtu);
131 #ifdef IFLA_OPERSTATE
132 NLA_PUT_U8(skb, IFLA_OPERSTATE,
133 netif_running(dev) ? dev->operstate : IF_OPER_DOWN);
137 NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
139 if (dev->ifindex != dev->iflink)
140 NLA_PUT_U32(skb, IFLA_LINK, dev->iflink);
142 return nlmsg_end(skb, nlh);
145 nlmsg_cancel(skb, nlh);
149 static void dp_ifinfo_notify(int event, struct net_bridge_port *port)
151 struct net *net = dev_net(port->dev);
155 skb = nlmsg_new(br_nlmsg_size(), GFP_KERNEL);
159 err = dp_fill_ifinfo(skb, port, event, 0);
161 /* -EMSGSIZE implies BUG in br_nlmsg_size() */
162 WARN_ON(err == -EMSGSIZE);
166 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_KERNEL);
170 rtnl_set_sk_err(net, RTNLGRP_LINK, err);
173 static void release_dp(struct kobject *kobj)
175 struct datapath *dp = container_of(kobj, struct datapath, ifobj);
179 struct kobj_type dp_ktype = {
180 .release = release_dp
183 static int create_dp(int dp_idx, const char __user *devnamep)
185 struct net_device *dp_dev;
186 char devname[IFNAMSIZ];
193 if (strncpy_from_user(devname, devnamep, IFNAMSIZ - 1) < 0)
195 devname[IFNAMSIZ - 1] = '\0';
197 snprintf(devname, sizeof devname, "of%d", dp_idx);
201 mutex_lock(&dp_mutex);
203 if (!try_module_get(THIS_MODULE))
206 /* Exit early if a datapath with that number already exists.
207 * (We don't use -EEXIST because that's ambiguous with 'devname'
208 * conflicting with an existing network device name.) */
214 dp = kzalloc(sizeof *dp, GFP_KERNEL);
217 INIT_LIST_HEAD(&dp->port_list);
218 mutex_init(&dp->mutex);
220 for (i = 0; i < DP_N_QUEUES; i++)
221 skb_queue_head_init(&dp->queues[i]);
222 init_waitqueue_head(&dp->waitqueue);
224 /* Initialize kobject for bridge. This will be added as
225 * /sys/class/net/<devname>/brif later, if sysfs is enabled. */
226 dp->ifobj.kset = NULL;
227 kobject_init(&dp->ifobj, &dp_ktype);
229 /* Allocate table. */
231 rcu_assign_pointer(dp->table, dp_table_create(DP_L1_SIZE));
235 /* Setup our datapath device */
236 dp_dev = dp_dev_create(dp, devname, ODPP_LOCAL);
237 err = PTR_ERR(dp_dev);
239 goto err_destroy_table;
241 err = new_nbp(dp, dp_dev, ODPP_LOCAL);
243 dp_dev_destroy(dp_dev);
244 goto err_destroy_table;
248 dp->stats_percpu = alloc_percpu(struct dp_stats_percpu);
249 if (!dp->stats_percpu)
250 goto err_destroy_local_port;
252 rcu_assign_pointer(dps[dp_idx], dp);
253 mutex_unlock(&dp_mutex);
260 err_destroy_local_port:
261 dp_del_port(dp->ports[ODPP_LOCAL]);
263 dp_table_destroy(dp->table, 0);
267 module_put(THIS_MODULE);
269 mutex_unlock(&dp_mutex);
275 static void do_destroy_dp(struct datapath *dp)
277 struct net_bridge_port *p, *n;
280 list_for_each_entry_safe (p, n, &dp->port_list, node)
281 if (p->port_no != ODPP_LOCAL)
286 rcu_assign_pointer(dps[dp->dp_idx], NULL);
288 dp_del_port(dp->ports[ODPP_LOCAL]);
290 dp_table_destroy(dp->table, 1);
292 for (i = 0; i < DP_N_QUEUES; i++)
293 skb_queue_purge(&dp->queues[i]);
294 for (i = 0; i < DP_MAX_GROUPS; i++)
295 kfree(dp->groups[i]);
296 free_percpu(dp->stats_percpu);
297 kobject_put(&dp->ifobj);
298 module_put(THIS_MODULE);
301 static int destroy_dp(int dp_idx)
307 mutex_lock(&dp_mutex);
317 mutex_unlock(&dp_mutex);
322 static void release_nbp(struct kobject *kobj)
324 struct net_bridge_port *p = container_of(kobj, struct net_bridge_port, kobj);
328 struct kobj_type brport_ktype = {
330 .sysfs_ops = &brport_sysfs_ops,
332 .release = release_nbp
335 /* Called with RTNL lock and dp_mutex. */
336 static int new_nbp(struct datapath *dp, struct net_device *dev, int port_no)
338 struct net_bridge_port *p;
340 if (dev->br_port != NULL)
343 p = kzalloc(sizeof(*p), GFP_KERNEL);
347 dev_set_promiscuity(dev, 1);
349 p->port_no = port_no;
353 rcu_assign_pointer(dev->br_port, p);
355 /* It would make sense to assign dev->br_port here too, but
356 * that causes packets received on internal ports to get caught
357 * in dp_frame_hook(). In turn dp_frame_hook() can reject them
358 * back to network stack, but that's a waste of time. */
360 rcu_assign_pointer(dp->ports[port_no], p);
361 list_add_rcu(&p->node, &dp->port_list);
364 /* Initialize kobject for bridge. This will be added as
365 * /sys/class/net/<devname>/brport later, if sysfs is enabled. */
367 kobject_init(&p->kobj, &brport_ktype);
369 dp_ifinfo_notify(RTM_NEWLINK, p);
374 static int add_port(int dp_idx, struct odp_port __user *portp)
376 struct net_device *dev;
378 struct odp_port port;
383 if (copy_from_user(&port, portp, sizeof port))
385 port.devname[IFNAMSIZ - 1] = '\0';
388 dp = get_dp_locked(dp_idx);
391 goto out_unlock_rtnl;
393 for (port_no = 1; port_no < DP_MAX_PORTS; port_no++)
394 if (!dp->ports[port_no])
400 if (!(port.flags & ODP_PORT_INTERNAL)) {
402 dev = dev_get_by_name(&init_net, port.devname);
407 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER ||
411 dev = dp_dev_create(dp, port.devname, port_no);
418 err = new_nbp(dp, dev, port_no);
422 dp_sysfs_add_if(dp->ports[port_no]);
424 err = __put_user(port_no, &port.port);
429 mutex_unlock(&dp->mutex);
436 int dp_del_port(struct net_bridge_port *p)
440 if (p->port_no != ODPP_LOCAL)
442 dp_ifinfo_notify(RTM_DELLINK, p);
446 if (is_dp_dev(p->dev)) {
447 /* Make sure that no packets arrive from now on, since
448 * dp_dev_xmit() will try to find itself through
449 * p->dp->ports[], and we're about to set that to null. */
450 netif_tx_disable(p->dev);
453 /* First drop references to device. */
454 dev_set_promiscuity(p->dev, -1);
455 list_del_rcu(&p->node);
456 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
457 rcu_assign_pointer(p->dev->br_port, NULL);
459 /* Then wait until no one is still using it, and destroy it. */
462 if (is_dp_dev(p->dev))
463 dp_dev_destroy(p->dev);
465 kobject_put(&p->kobj);
470 static int del_port(int dp_idx, int port_no)
472 struct net_bridge_port *p;
478 if (port_no < 0 || port_no >= DP_MAX_PORTS || port_no == ODPP_LOCAL)
482 dp = get_dp_locked(dp_idx);
485 goto out_unlock_rtnl;
487 p = dp->ports[port_no];
492 err = dp_del_port(p);
495 mutex_unlock(&dp->mutex);
502 /* Must be called with rcu_read_lock. */
504 do_port_input(struct net_bridge_port *p, struct sk_buff *skb)
506 /* Make our own copy of the packet. Otherwise we will mangle the
507 * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
508 * (No one comes after us, since we tell handle_bridge() that we took
510 skb = skb_share_check(skb, GFP_ATOMIC);
514 /* Push the Ethernet header back on. */
515 skb_push(skb, ETH_HLEN);
516 skb_reset_mac_header(skb);
517 dp_process_received_packet(skb, p);
520 /* Must be called with rcu_read_lock and with bottom-halves disabled. */
521 void dp_process_received_packet(struct sk_buff *skb, struct net_bridge_port *p)
523 struct datapath *dp = p->dp;
524 struct dp_stats_percpu *stats;
525 struct odp_flow_key key;
526 struct sw_flow *flow;
528 WARN_ON_ONCE(skb_shared(skb));
530 /* BHs are off so we don't have to use get_cpu()/put_cpu() here. */
531 stats = percpu_ptr(dp->stats_percpu, smp_processor_id());
533 if (flow_extract(skb, p ? p->port_no : ODPP_NONE, &key)) {
534 if (dp->drop_frags) {
541 flow = dp_table_lookup(rcu_dereference(dp->table), &key);
543 struct sw_flow_actions *acts = rcu_dereference(flow->sf_acts);
544 flow_used(flow, skb);
545 execute_actions(dp, skb, &key, acts->actions, acts->n_actions,
550 dp_output_control(dp, skb, _ODPL_MISS_NR, 0);
555 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
556 * different set of devices!)
558 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
559 /* Called with rcu_read_lock and bottom-halves disabled. */
560 static struct sk_buff *dp_frame_hook(struct net_bridge_port *p,
563 do_port_input(p, skb);
566 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
567 /* Called with rcu_read_lock and bottom-halves disabled. */
568 static int dp_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
570 do_port_input(p, *pskb);
577 #if defined(CONFIG_XEN) && LINUX_VERSION_CODE == KERNEL_VERSION(2,6,18)
578 /* This code is copied verbatim from net/dev/core.c in Xen's
579 * linux-2.6.18-92.1.10.el5.xs5.0.0.394.644. We can't call those functions
580 * directly because they aren't exported. */
581 static int skb_pull_up_to(struct sk_buff *skb, void *ptr)
583 if (ptr < (void *)skb->tail)
585 if (__pskb_pull_tail(skb,
586 ptr - (void *)skb->data - skb_headlen(skb))) {
593 int vswitch_skb_checksum_setup(struct sk_buff *skb)
595 if (skb->proto_csum_blank) {
596 if (skb->protocol != htons(ETH_P_IP))
598 if (!skb_pull_up_to(skb, skb->nh.iph + 1))
600 skb->h.raw = (unsigned char *)skb->nh.iph + 4*skb->nh.iph->ihl;
601 switch (skb->nh.iph->protocol) {
603 skb->csum = offsetof(struct tcphdr, check);
606 skb->csum = offsetof(struct udphdr, check);
610 printk(KERN_ERR "Attempting to checksum a non-"
611 "TCP/UDP packet, dropping a protocol"
612 " %d packet", skb->nh.iph->protocol);
615 if (!skb_pull_up_to(skb, skb->h.raw + skb->csum + 2))
617 skb->ip_summed = CHECKSUM_HW;
618 skb->proto_csum_blank = 0;
625 int vswitch_skb_checksum_setup(struct sk_buff *skb) { return 0; }
626 #endif /* CONFIG_XEN && linux == 2.6.18 */
629 dp_output_control(struct datapath *dp, struct sk_buff *skb, int queue_no,
632 struct dp_stats_percpu *stats;
633 struct sk_buff_head *queue;
637 WARN_ON_ONCE(skb_shared(skb));
638 BUG_ON(queue_no != _ODPL_MISS_NR && queue_no != _ODPL_ACTION_NR);
640 queue = &dp->queues[queue_no];
642 if (skb_queue_len(queue) >= DP_MAX_QUEUE_LEN)
645 /* If a checksum-deferred packet is forwarded to the controller,
646 * correct the pointers and checksum. This happens on a regular basis
647 * only on Xen, on which VMs can pass up packets that do not have their
650 err = vswitch_skb_checksum_setup(skb);
654 if (skb->ip_summed == CHECKSUM_PARTIAL) {
655 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
656 /* Until 2.6.22, the start of the transport header was also the
657 * start of data to be checksummed. Linux 2.6.22 introduced
658 * the csum_start field for this purpose, but we should point
659 * the transport header to it anyway for backward
660 * compatibility, as dev_queue_xmit() does even in 2.6.28. */
661 skb_set_transport_header(skb, skb->csum_start -
664 err = skb_checksum_help(skb);
669 if (skb->ip_summed == CHECKSUM_HW) {
670 err = skb_checksum_help(skb, 0);
676 /* Break apart GSO packets into their component pieces. Otherwise
677 * userspace may try to stuff a 64kB packet into a 1500-byte MTU. */
678 if (skb_is_gso(skb)) {
679 struct sk_buff *nskb = skb_gso_segment(skb, 0);
683 if (unlikely(IS_ERR(skb))) {
688 /* XXX This case might not be possible. It's hard to
689 * tell from the skb_gso_segment() code and comment. */
693 /* Figure out port number. */
694 port_no = ODPP_LOCAL;
696 if (skb->dev->br_port)
697 port_no = skb->dev->br_port->port_no;
698 else if (is_dp_dev(skb->dev))
699 port_no = dp_dev_priv(skb->dev)->port_no;
702 /* Append each packet to queue. There will be only one packet unless
703 * we broke up a GSO packet above. */
705 struct odp_msg *header;
706 struct sk_buff *nskb = skb->next;
709 err = skb_cow(skb, sizeof *header);
719 header = (struct odp_msg*)__skb_push(skb, sizeof *header);
720 header->type = queue_no;
721 header->length = skb->len;
722 header->port = port_no;
723 header->reserved = 0;
725 skb_queue_tail(queue, skb);
730 wake_up_interruptible(&dp->waitqueue);
736 stats = percpu_ptr(dp->stats_percpu, get_cpu());
743 static int flush_flows(struct datapath *dp)
746 return dp_table_flush(dp);
749 static int validate_actions(const struct sw_flow_actions *actions)
753 for (i = 0; i < actions->n_actions; i++) {
754 const union odp_action *a = &actions->actions[i];
757 if (a->output.port >= DP_MAX_PORTS)
761 case ODPAT_OUTPUT_GROUP:
762 if (a->output_group.group >= DP_MAX_GROUPS)
766 case ODPAT_SET_VLAN_VID:
767 if (a->vlan_vid.vlan_vid & htons(~VLAN_VID_MASK))
771 case ODPAT_SET_VLAN_PCP:
772 if (a->vlan_pcp.vlan_pcp & ~VLAN_PCP_MASK)
777 if (a->type >= ODPAT_N_ACTIONS)
786 static struct sw_flow_actions *get_actions(const struct odp_flow *flow)
788 struct sw_flow_actions *actions;
791 actions = flow_actions_alloc(flow->n_actions);
792 error = PTR_ERR(actions);
797 if (copy_from_user(actions->actions, flow->actions,
798 flow->n_actions * sizeof(union odp_action)))
799 goto error_free_actions;
800 error = validate_actions(actions);
802 goto error_free_actions;
809 return ERR_PTR(error);
812 static void get_stats(struct sw_flow *flow, struct odp_flow_stats *stats)
814 if (flow->used.tv_sec) {
815 stats->used_sec = flow->used.tv_sec;
816 stats->used_nsec = flow->used.tv_nsec;
819 stats->used_nsec = 0;
821 stats->n_packets = flow->packet_count;
822 stats->n_bytes = flow->byte_count;
823 stats->ip_tos = flow->ip_tos;
824 stats->tcp_flags = flow->tcp_flags;
828 static void clear_stats(struct sw_flow *flow)
830 flow->used.tv_sec = flow->used.tv_nsec = 0;
833 flow->packet_count = 0;
834 flow->byte_count = 0;
837 static int put_flow(struct datapath *dp, struct odp_flow_put __user *ufp)
839 struct odp_flow_put uf;
840 struct sw_flow *flow;
841 struct dp_table *table;
842 struct odp_flow_stats stats;
846 if (copy_from_user(&uf, ufp, sizeof(struct odp_flow_put)))
848 uf.flow.key.reserved = 0;
850 table = rcu_dereference(dp->table);
851 flow = dp_table_lookup(table, &uf.flow.key);
854 struct sw_flow_actions *acts;
857 if (!(uf.flags & ODPPF_CREATE))
860 /* Expand table, if necessary, to make room. */
861 if (dp->n_flows >= table->n_buckets) {
863 if (table->n_buckets >= DP_MAX_BUCKETS)
866 error = dp_table_expand(dp);
869 table = rcu_dereference(dp->table);
874 flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
877 flow->key = uf.flow.key;
878 spin_lock_init(&flow->lock);
881 /* Obtain actions. */
882 acts = get_actions(&uf.flow);
883 error = PTR_ERR(acts);
885 goto error_free_flow;
886 rcu_assign_pointer(flow->sf_acts, acts);
888 /* Put flow in bucket. */
889 error = dp_table_insert(table, flow);
891 goto error_free_flow_acts;
893 memset(&stats, 0, sizeof(struct odp_flow_stats));
895 /* We found a matching flow. */
896 struct sw_flow_actions *old_acts, *new_acts;
897 unsigned long int flags;
899 /* Bail out if we're not allowed to modify an existing flow. */
901 if (!(uf.flags & ODPPF_MODIFY))
905 new_acts = get_actions(&uf.flow);
906 error = PTR_ERR(new_acts);
907 if (IS_ERR(new_acts))
909 old_acts = rcu_dereference(flow->sf_acts);
910 if (old_acts->n_actions != new_acts->n_actions ||
911 memcmp(old_acts->actions, new_acts->actions,
912 sizeof(union odp_action) * old_acts->n_actions)) {
913 rcu_assign_pointer(flow->sf_acts, new_acts);
914 flow_deferred_free_acts(old_acts);
919 /* Fetch stats, then clear them if necessary. */
920 spin_lock_irqsave(&flow->lock, flags);
921 get_stats(flow, &stats);
922 if (uf.flags & ODPPF_ZERO_STATS)
924 spin_unlock_irqrestore(&flow->lock, flags);
927 /* Copy stats to userspace. */
928 if (__copy_to_user(&ufp->flow.stats, &stats,
929 sizeof(struct odp_flow_stats)))
933 error_free_flow_acts:
934 kfree(flow->sf_acts);
936 kmem_cache_free(flow_cache, flow);
941 static int put_actions(const struct sw_flow *flow, struct odp_flow __user *ufp)
943 union odp_action __user *actions;
944 struct sw_flow_actions *sf_acts;
947 if (__get_user(actions, &ufp->actions) ||
948 __get_user(n_actions, &ufp->n_actions))
954 sf_acts = rcu_dereference(flow->sf_acts);
955 if (__put_user(sf_acts->n_actions, &ufp->n_actions) ||
956 (actions && copy_to_user(actions, sf_acts->actions,
957 sizeof(union odp_action) *
958 min(sf_acts->n_actions, n_actions))))
964 static int answer_query(struct sw_flow *flow, struct odp_flow __user *ufp)
966 struct odp_flow_stats stats;
967 unsigned long int flags;
969 spin_lock_irqsave(&flow->lock, flags);
970 get_stats(flow, &stats);
971 spin_unlock_irqrestore(&flow->lock, flags);
973 if (__copy_to_user(&ufp->stats, &stats, sizeof(struct odp_flow_stats)))
975 return put_actions(flow, ufp);
978 static int del_flow(struct datapath *dp, struct odp_flow __user *ufp)
980 struct dp_table *table = rcu_dereference(dp->table);
982 struct sw_flow *flow;
986 if (copy_from_user(&uf, ufp, sizeof uf))
990 flow = dp_table_lookup(table, &uf.key);
995 /* XXX redundant lookup */
996 error = dp_table_delete(table, flow);
1000 /* XXX These statistics might lose a few packets, since other CPUs can
1001 * be using this flow. We used to synchronize_rcu() to make sure that
1002 * we get completely accurate stats, but that blows our performance,
1005 error = answer_query(flow, ufp);
1006 flow_deferred_free(flow);
1012 static int query_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1014 struct dp_table *table = rcu_dereference(dp->table);
1016 for (i = 0; i < flowvec->n_flows; i++) {
1017 struct __user odp_flow *ufp = &flowvec->flows[i];
1019 struct sw_flow *flow;
1022 if (__copy_from_user(&uf, ufp, sizeof uf))
1024 uf.key.reserved = 0;
1026 flow = dp_table_lookup(table, &uf.key);
1028 error = __put_user(ENOENT, &ufp->stats.error);
1030 error = answer_query(flow, ufp);
1034 return flowvec->n_flows;
1037 struct list_flows_cbdata {
1038 struct odp_flow __user *uflows;
1043 static int list_flow(struct sw_flow *flow, void *cbdata_)
1045 struct list_flows_cbdata *cbdata = cbdata_;
1046 struct odp_flow __user *ufp = &cbdata->uflows[cbdata->listed_flows++];
1049 if (__copy_to_user(&ufp->key, &flow->key, sizeof flow->key))
1051 error = answer_query(flow, ufp);
1055 if (cbdata->listed_flows >= cbdata->n_flows)
1056 return cbdata->listed_flows;
1060 static int list_flows(struct datapath *dp, const struct odp_flowvec *flowvec)
1062 struct list_flows_cbdata cbdata;
1065 if (!flowvec->n_flows)
1068 cbdata.uflows = flowvec->flows;
1069 cbdata.n_flows = flowvec->n_flows;
1070 cbdata.listed_flows = 0;
1071 error = dp_table_foreach(rcu_dereference(dp->table),
1072 list_flow, &cbdata);
1073 return error ? error : cbdata.listed_flows;
1076 static int do_flowvec_ioctl(struct datapath *dp, unsigned long argp,
1077 int (*function)(struct datapath *,
1078 const struct odp_flowvec *))
1080 struct odp_flowvec __user *uflowvec;
1081 struct odp_flowvec flowvec;
1084 uflowvec = (struct odp_flowvec __user *)argp;
1085 if (!access_ok(VERIFY_WRITE, uflowvec, sizeof *uflowvec) ||
1086 copy_from_user(&flowvec, uflowvec, sizeof flowvec))
1089 if (flowvec.n_flows > INT_MAX / sizeof(struct odp_flow))
1092 if (!access_ok(VERIFY_WRITE, flowvec.flows,
1093 flowvec.n_flows * sizeof(struct odp_flow)))
1096 retval = function(dp, &flowvec);
1097 return (retval < 0 ? retval
1098 : retval == flowvec.n_flows ? 0
1099 : __put_user(retval, &uflowvec->n_flows));
1102 static int do_execute(struct datapath *dp, const struct odp_execute *executep)
1104 struct odp_execute execute;
1105 struct odp_flow_key key;
1106 struct sk_buff *skb;
1107 struct sw_flow_actions *actions;
1112 if (copy_from_user(&execute, executep, sizeof execute))
1116 if (execute.length < ETH_HLEN || execute.length > 65535)
1120 actions = flow_actions_alloc(execute.n_actions);
1125 if (copy_from_user(actions->actions, execute.actions,
1126 execute.n_actions * sizeof *execute.actions))
1127 goto error_free_actions;
1129 err = validate_actions(actions);
1131 goto error_free_actions;
1134 skb = alloc_skb(execute.length, GFP_KERNEL);
1136 goto error_free_actions;
1137 if (execute.in_port < DP_MAX_PORTS) {
1138 struct net_bridge_port *p = dp->ports[execute.in_port];
1144 if (copy_from_user(skb_put(skb, execute.length), 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 flow_extract(skb, execute.in_port, &key);
1160 err = execute_actions(dp, skb, &key, actions->actions,
1161 actions->n_actions, GFP_KERNEL);
1173 static int get_dp_stats(struct datapath *dp, struct odp_stats __user *statsp)
1175 struct odp_stats stats;
1178 stats.n_flows = dp->n_flows;
1179 stats.cur_capacity = rcu_dereference(dp->table)->n_buckets;
1180 stats.max_capacity = DP_MAX_BUCKETS;
1181 stats.n_ports = dp->n_ports;
1182 stats.max_ports = DP_MAX_PORTS;
1183 stats.max_groups = DP_MAX_GROUPS;
1184 stats.n_frags = stats.n_hit = stats.n_missed = stats.n_lost = 0;
1185 for_each_possible_cpu(i) {
1186 const struct dp_stats_percpu *s;
1187 s = percpu_ptr(dp->stats_percpu, i);
1188 stats.n_frags += s->n_frags;
1189 stats.n_hit += s->n_hit;
1190 stats.n_missed += s->n_missed;
1191 stats.n_lost += s->n_lost;
1193 stats.max_miss_queue = DP_MAX_QUEUE_LEN;
1194 stats.max_action_queue = DP_MAX_QUEUE_LEN;
1195 return copy_to_user(statsp, &stats, sizeof stats) ? -EFAULT : 0;
1198 /* MTU of the dp pseudo-device: ETH_DATA_LEN or the minimum of the ports */
1199 int dp_min_mtu(const struct datapath *dp)
1201 struct net_bridge_port *p;
1206 list_for_each_entry_rcu (p, &dp->port_list, node) {
1207 struct net_device *dev = p->dev;
1209 /* Skip any internal ports, since that's what we're trying to
1214 if (!mtu || dev->mtu < mtu)
1218 return mtu ? mtu : ETH_DATA_LEN;
1222 put_port(const struct net_bridge_port *p, struct odp_port __user *uop)
1225 memset(&op, 0, sizeof op);
1226 strncpy(op.devname, p->dev->name, sizeof op.devname);
1227 op.port = p->port_no;
1228 op.flags = is_dp_dev(p->dev) ? ODP_PORT_INTERNAL : 0;
1229 return copy_to_user(uop, &op, sizeof op) ? -EFAULT : 0;
1233 query_port(struct datapath *dp, struct odp_port __user *uport)
1235 struct odp_port port;
1237 if (copy_from_user(&port, uport, sizeof port))
1239 if (port.devname[0]) {
1240 struct net_bridge_port *p;
1241 struct net_device *dev;
1244 port.devname[IFNAMSIZ - 1] = '\0';
1246 dev = dev_get_by_name(&init_net, port.devname);
1251 if (!p && is_dp_dev(dev)) {
1252 struct dp_dev *dp_dev = dp_dev_priv(dev);
1253 if (dp_dev->dp == dp)
1254 p = dp->ports[dp_dev->port_no];
1256 err = p && p->dp == dp ? put_port(p, uport) : -ENOENT;
1261 if (port.port >= DP_MAX_PORTS)
1263 if (!dp->ports[port.port])
1265 return put_port(dp->ports[port.port], uport);
1270 list_ports(struct datapath *dp, struct odp_portvec __user *pvp)
1272 struct odp_portvec pv;
1273 struct net_bridge_port *p;
1276 if (copy_from_user(&pv, pvp, sizeof pv))
1281 list_for_each_entry_rcu (p, &dp->port_list, node) {
1282 if (put_port(p, &pv.ports[idx]))
1284 if (idx++ >= pv.n_ports)
1288 return put_user(dp->n_ports, &pvp->n_ports);
1291 /* RCU callback for freeing a dp_port_group */
1292 static void free_port_group(struct rcu_head *rcu)
1294 struct dp_port_group *g = container_of(rcu, struct dp_port_group, rcu);
1299 set_port_group(struct datapath *dp, const struct odp_port_group __user *upg)
1301 struct odp_port_group pg;
1302 struct dp_port_group *new_group, *old_group;
1306 if (copy_from_user(&pg, upg, sizeof pg))
1310 if (pg.n_ports > DP_MAX_PORTS || pg.group >= DP_MAX_GROUPS)
1314 new_group = kmalloc(sizeof *new_group + sizeof(u16) * pg.n_ports,
1319 new_group->n_ports = pg.n_ports;
1321 if (copy_from_user(new_group->ports, pg.ports,
1322 sizeof(u16) * pg.n_ports))
1325 old_group = rcu_dereference(dp->groups[pg.group]);
1326 rcu_assign_pointer(dp->groups[pg.group], new_group);
1328 call_rcu(&old_group->rcu, free_port_group);
1338 get_port_group(struct datapath *dp, struct odp_port_group *upg)
1340 struct odp_port_group pg;
1341 struct dp_port_group *g;
1344 if (copy_from_user(&pg, upg, sizeof pg))
1347 if (pg.group >= DP_MAX_GROUPS)
1350 g = dp->groups[pg.group];
1351 n_copy = g ? min_t(int, g->n_ports, pg.n_ports) : 0;
1352 if (n_copy && copy_to_user(pg.ports, g->ports, n_copy * sizeof(u16)))
1355 if (put_user(g ? g->n_ports : 0, &upg->n_ports))
1361 static long openvswitch_ioctl(struct file *f, unsigned int cmd,
1364 int dp_idx = iminor(f->f_dentry->d_inode);
1365 struct datapath *dp;
1366 int drop_frags, listeners, port_no;
1369 /* Handle commands with special locking requirements up front. */
1372 err = create_dp(dp_idx, (char __user *)argp);
1375 case ODP_DP_DESTROY:
1376 err = destroy_dp(dp_idx);
1380 err = add_port(dp_idx, (struct odp_port __user *)argp);
1384 err = get_user(port_no, (int __user *)argp);
1386 err = del_port(dp_idx, port_no);
1390 dp = get_dp_locked(dp_idx);
1397 err = get_dp_stats(dp, (struct odp_stats __user *)argp);
1400 case ODP_GET_DROP_FRAGS:
1401 err = put_user(dp->drop_frags, (int __user *)argp);
1404 case ODP_SET_DROP_FRAGS:
1405 err = get_user(drop_frags, (int __user *)argp);
1409 if (drop_frags != 0 && drop_frags != 1)
1411 dp->drop_frags = drop_frags;
1415 case ODP_GET_LISTEN_MASK:
1416 err = put_user((int)f->private_data, (int __user *)argp);
1419 case ODP_SET_LISTEN_MASK:
1420 err = get_user(listeners, (int __user *)argp);
1424 if (listeners & ~ODPL_ALL)
1427 f->private_data = (void*)listeners;
1430 case ODP_PORT_QUERY:
1431 err = query_port(dp, (struct odp_port __user *)argp);
1435 err = list_ports(dp, (struct odp_portvec __user *)argp);
1438 case ODP_PORT_GROUP_SET:
1439 err = set_port_group(dp, (struct odp_port_group __user *)argp);
1442 case ODP_PORT_GROUP_GET:
1443 err = get_port_group(dp, (struct odp_port_group __user *)argp);
1446 case ODP_FLOW_FLUSH:
1447 err = flush_flows(dp);
1451 err = put_flow(dp, (struct odp_flow_put __user *)argp);
1455 err = del_flow(dp, (struct odp_flow __user *)argp);
1459 err = do_flowvec_ioctl(dp, argp, query_flows);
1463 err = do_flowvec_ioctl(dp, argp, list_flows);
1467 err = do_execute(dp, (struct odp_execute __user *)argp);
1474 mutex_unlock(&dp->mutex);
1479 static int dp_has_packet_of_interest(struct datapath *dp, int listeners)
1482 for (i = 0; i < DP_N_QUEUES; i++) {
1483 if (listeners & (1 << i) && !skb_queue_empty(&dp->queues[i]))
1489 ssize_t openvswitch_read(struct file *f, char __user *buf, size_t nbytes,
1492 /* XXX is there sufficient synchronization here? */
1493 int listeners = (int) f->private_data;
1494 int dp_idx = iminor(f->f_dentry->d_inode);
1495 struct datapath *dp = get_dp(dp_idx);
1496 struct sk_buff *skb;
1497 struct iovec __user iov;
1504 if (nbytes == 0 || !listeners)
1510 for (i = 0; i < DP_N_QUEUES; i++) {
1511 if (listeners & (1 << i)) {
1512 skb = skb_dequeue(&dp->queues[i]);
1518 if (f->f_flags & O_NONBLOCK) {
1523 wait_event_interruptible(dp->waitqueue,
1524 dp_has_packet_of_interest(dp,
1527 if (signal_pending(current)) {
1528 retval = -ERESTARTSYS;
1533 copy_bytes = min(skb->len, nbytes);
1535 iov.iov_len = copy_bytes;
1536 retval = skb_copy_datagram_iovec(skb, 0, &iov, iov.iov_len);
1538 retval = copy_bytes;
1545 static unsigned int openvswitch_poll(struct file *file, poll_table *wait)
1547 /* XXX is there sufficient synchronization here? */
1548 int dp_idx = iminor(file->f_dentry->d_inode);
1549 struct datapath *dp = get_dp(dp_idx);
1554 poll_wait(file, &dp->waitqueue, wait);
1555 if (dp_has_packet_of_interest(dp, (int)file->private_data))
1556 mask |= POLLIN | POLLRDNORM;
1558 mask = POLLIN | POLLRDNORM | POLLHUP;
1563 struct file_operations openvswitch_fops = {
1564 /* XXX .aio_read = openvswitch_aio_read, */
1565 .read = openvswitch_read,
1566 .poll = openvswitch_poll,
1567 .unlocked_ioctl = openvswitch_ioctl,
1568 /* XXX .fasync = openvswitch_fasync, */
1572 static struct llc_sap *dp_stp_sap;
1574 static int dp_stp_rcv(struct sk_buff *skb, struct net_device *dev,
1575 struct packet_type *pt, struct net_device *orig_dev)
1577 /* We don't really care about STP packets, we just listen for them for
1578 * mutual exclusion with the bridge module, so this just discards
1584 static int __init dp_init(void)
1588 printk("Open vSwitch %s, built "__DATE__" "__TIME__"\n", VERSION BUILDNR);
1590 /* Register to receive STP packets because the bridge module also
1591 * attempts to do so. Since there can only be a single listener for a
1592 * given protocol, this provides mutual exclusion against the bridge
1593 * module, preventing both of them from being loaded at the same
1595 dp_stp_sap = llc_sap_open(LLC_SAP_BSPAN, dp_stp_rcv);
1597 printk(KERN_ERR "openvswitch: can't register sap for STP (probably the bridge module is loaded)\n");
1605 err = register_netdevice_notifier(&dp_device_notifier);
1607 goto error_flow_exit;
1609 major = register_chrdev(0, "openvswitch", &openvswitch_fops);
1611 goto error_unreg_notifier;
1613 /* Hook into callback used by the bridge to intercept packets.
1614 * Parasites we are. */
1615 br_handle_frame_hook = dp_frame_hook;
1619 error_unreg_notifier:
1620 unregister_netdevice_notifier(&dp_device_notifier);
1627 static void dp_cleanup(void)
1630 unregister_chrdev(major, "openvswitch");
1631 unregister_netdevice_notifier(&dp_device_notifier);
1633 br_handle_frame_hook = NULL;
1634 llc_sap_put(dp_stp_sap);
1637 module_init(dp_init);
1638 module_exit(dp_cleanup);
1640 MODULE_DESCRIPTION("Open vSwitch switching datapath");
1641 MODULE_LICENSE("GPL");