2 * Distributed under the terms of the GNU GPL version 2.
3 * Copyright (c) 2007, 2008 The Board of Trustees of The Leland
4 * Stanford Junior University
7 /* Functions for managing the dp interface/device. */
9 #include <linux/init.h>
10 #include <linux/module.h>
11 #include <linux/if_arp.h>
12 #include <linux/if_bridge.h>
13 #include <linux/if_vlan.h>
15 #include <net/genetlink.h>
17 #include <linux/delay.h>
18 #include <linux/etherdevice.h>
19 #include <linux/kernel.h>
20 #include <linux/kthread.h>
21 #include <linux/mutex.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/rcupdate.h>
24 #include <linux/version.h>
25 #include <linux/ethtool.h>
26 #include <linux/random.h>
27 #include <asm/system.h>
28 #include <linux/netfilter_bridge.h>
29 #include <linux/inetdevice.h>
30 #include <linux/list.h>
31 #include <linux/rculist.h>
32 #include <linux/workqueue.h>
34 #include "openflow-netlink.h"
45 /* Strings to describe the manufacturer, hardware, and software. This data
46 * is queriable through the switch description stats message. */
47 static char mfr_desc[DESC_STR_LEN] = "Nicira Networks";
48 static char hw_desc[DESC_STR_LEN] = "Reference Linux Kernel Module";
49 static char sw_desc[DESC_STR_LEN] = VERSION;
50 static char serial_num[SERIAL_NUM_LEN] = "None";
52 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
53 module_param_string(mfr_desc, mfr_desc, sizeof mfr_desc, 0444);
54 module_param_string(hw_desc, hw_desc, sizeof hw_desc, 0444);
55 module_param_string(sw_desc, sw_desc, sizeof sw_desc, 0444);
56 module_param_string(serial_num, serial_num, sizeof serial_num, 0444);
58 MODULE_PARM(mfr_desc, "s");
59 MODULE_PARM(hw_desc, "s");
60 MODULE_PARM(sw_desc, "s");
61 MODULE_PARM(serial_num, "s");
65 /* Number of milliseconds between runs of the maintenance thread. */
66 #define MAINT_SLEEP_MSECS 1000
68 #define UINT32_MAX 4294967295U
69 #define UINT16_MAX 65535
70 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
72 static struct genl_family dp_genl_family;
73 static struct genl_multicast_group mc_group;
75 /* It's hard to imagine wanting more than one datapath, but... */
78 /* Datapaths. Protected on the read side by rcu_read_lock, on the write side
79 * by dp_mutex. dp_mutex is almost completely redundant with genl_mutex
80 * maintained by the Generic Netlink code, but the timeout path needs mutual
83 * It is safe to access the datapath and net_bridge_port structures with just
86 static struct datapath *dps[DP_MAX];
87 DEFINE_MUTEX(dp_mutex);
88 EXPORT_SYMBOL(dp_mutex);
90 static int dp_maint_func(void *data);
91 static void init_port_status(struct net_bridge_port *p);
92 static int dp_genl_openflow_done(struct netlink_callback *);
93 static struct net_bridge_port *new_nbp(struct datapath *,
94 struct net_device *, int port_no);
96 /* nla_shrink - reduce amount of space reserved by nla_reserve
97 * @skb: socket buffer from which to recover room
98 * @nla: netlink attribute to adjust
99 * @len: new length of attribute payload
101 * Reduces amount of space reserved by a call to nla_reserve.
103 * No other attributes may be added between calling nla_reserve and this
104 * function, since it will create a hole in the message.
106 void nla_shrink(struct sk_buff *skb, struct nlattr *nla, int len)
108 int delta = nla_total_size(len) - nla_total_size(nla_len(nla));
112 nla->nla_len = nla_attr_size(len);
115 /* Puts a set of openflow headers for a message of the given 'type' into 'skb'.
116 * If 'sender' is nonnull, then it is used as the message's destination. 'dp'
117 * must specify the datapath to use.
119 * '*max_openflow_len' receives the maximum number of bytes that are available
120 * for the embedded OpenFlow message. The caller must call
121 * resize_openflow_skb() to set the actual size of the message to this number
124 * Returns the openflow header if successful, otherwise (if 'skb' is too small)
127 put_openflow_headers(struct datapath *dp, struct sk_buff *skb, uint8_t type,
128 const struct sender *sender, int *max_openflow_len)
130 struct ofp_header *oh;
134 /* Assemble the Generic Netlink wrapper. */
135 if (!genlmsg_put(skb,
136 sender ? sender->pid : 0,
137 sender ? sender->seq : 0,
138 &dp_genl_family, 0, DP_GENL_C_OPENFLOW))
139 return ERR_PTR(-ENOBUFS);
140 if (nla_put_u32(skb, DP_GENL_A_DP_IDX, dp->dp_idx) < 0)
141 return ERR_PTR(-ENOBUFS);
142 openflow_len = (skb_tailroom(skb) - NLA_HDRLEN) & ~(NLA_ALIGNTO - 1);
143 if (openflow_len < sizeof *oh)
144 return ERR_PTR(-ENOBUFS);
145 *max_openflow_len = openflow_len;
146 attr = nla_reserve(skb, DP_GENL_A_OPENFLOW, openflow_len);
149 /* Fill in the header. The caller is responsible for the length. */
151 oh->version = OFP_VERSION;
153 oh->xid = sender ? sender->xid : 0;
158 /* Resizes OpenFlow header 'oh', which must be at the tail end of 'skb', to new
159 * length 'new_length' (in bytes), adjusting pointers and size values as
162 resize_openflow_skb(struct sk_buff *skb,
163 struct ofp_header *oh, size_t new_length)
165 struct nlattr *attr = ((void *) oh) - NLA_HDRLEN;
166 nla_shrink(skb, attr, new_length);
167 oh->length = htons(new_length);
168 nlmsg_end(skb, (struct nlmsghdr *) skb->data);
171 /* Allocates a new skb to contain an OpenFlow message 'openflow_len' bytes in
172 * length. Returns a null pointer if memory is unavailable, otherwise returns
173 * the OpenFlow header and stores a pointer to the skb in '*pskb'.
175 * 'type' is the OpenFlow message type. If 'sender' is nonnull, then it is
176 * used as the message's destination. 'dp' must specify the datapath to
179 alloc_openflow_skb(struct datapath *dp, size_t openflow_len, uint8_t type,
180 const struct sender *sender, struct sk_buff **pskb)
182 struct ofp_header *oh;
185 int max_openflow_len;
187 if ((openflow_len + sizeof(struct ofp_header)) > UINT16_MAX) {
189 printk("alloc_openflow_skb: openflow message too large: %zu\n",
194 genl_len = nlmsg_total_size(GENL_HDRLEN + dp_genl_family.hdrsize);
195 genl_len += nla_total_size(sizeof(uint32_t)); /* DP_GENL_A_DP_IDX */
196 genl_len += nla_total_size(openflow_len); /* DP_GENL_A_OPENFLOW */
197 skb = *pskb = genlmsg_new(genl_len, GFP_ATOMIC);
200 printk("alloc_openflow_skb: genlmsg_new failed\n");
204 oh = put_openflow_headers(dp, skb, type, sender, &max_openflow_len);
205 BUG_ON(!oh || IS_ERR(oh));
206 resize_openflow_skb(skb, oh, openflow_len);
211 /* Sends 'skb' to 'sender' if it is nonnull, otherwise multicasts 'skb' to all
214 send_openflow_skb(struct sk_buff *skb, const struct sender *sender)
217 ? genlmsg_unicast(skb, sender->pid)
218 : genlmsg_multicast(skb, 0, mc_group.id, GFP_ATOMIC));
221 /* Generates a unique datapath id. It incorporates the datapath index
222 * and a hardware address, if available. If not, it generates a random
226 uint64_t gen_datapath_id(uint16_t dp_idx)
230 struct net_device *dev;
232 /* The top 16 bits are used to identify the datapath. The lower 48 bits
233 * use an interface address. */
234 id = (uint64_t)dp_idx << 48;
235 if ((dev = dev_get_by_name(&init_net, "ctl0"))
236 || (dev = dev_get_by_name(&init_net, "eth0"))) {
237 for (i=0; i<ETH_ALEN; i++) {
238 id |= (uint64_t)dev->dev_addr[i] << (8*(ETH_ALEN-1 - i));
242 /* Randomly choose the lower 48 bits if we cannot find an
243 * address and mark the most significant bit to indicate that
244 * this was randomly generated. */
245 uint8_t rand[ETH_ALEN];
246 get_random_bytes(rand, ETH_ALEN);
247 id |= (uint64_t)1 << 63;
248 for (i=0; i<ETH_ALEN; i++) {
249 id |= (uint64_t)rand[i] << (8*(ETH_ALEN-1 - i));
256 /* Creates a new datapath numbered 'dp_idx'. Returns 0 for success or a
257 * negative error code. */
258 static int new_dp(int dp_idx)
263 if (dp_idx < 0 || dp_idx >= DP_MAX)
266 if (!try_module_get(THIS_MODULE))
269 /* Exit early if a datapath with that number already exists. */
276 dp = kzalloc(sizeof *dp, GFP_KERNEL);
280 /* Setup our "of" device */
281 err = dp_dev_setup(dp);
286 dp->id = gen_datapath_id(dp_idx);
287 dp->chain = chain_create(dp);
288 if (dp->chain == NULL)
289 goto err_destroy_dp_dev;
290 INIT_LIST_HEAD(&dp->port_list);
292 dp->local_port = new_nbp(dp, dp->netdev, OFPP_LOCAL);
293 if (IS_ERR(dp->local_port)) {
294 err = PTR_ERR(dp->local_port);
295 goto err_destroy_local_port;
299 dp->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN;
301 dp->dp_task = kthread_run(dp_maint_func, dp, "dp%d", dp_idx);
302 if (IS_ERR(dp->dp_task))
303 goto err_destroy_chain;
309 err_destroy_local_port:
310 dp_del_switch_port(dp->local_port);
312 chain_destroy(dp->chain);
318 module_put(THIS_MODULE);
322 /* Find and return a free port number under 'dp'. */
323 static int find_portno(struct datapath *dp)
326 for (i = 0; i < OFPP_MAX; i++)
327 if (dp->ports[i] == NULL)
332 static struct net_bridge_port *new_nbp(struct datapath *dp,
333 struct net_device *dev, int port_no)
335 struct net_bridge_port *p;
337 if (dev->br_port != NULL)
338 return ERR_PTR(-EBUSY);
340 p = kzalloc(sizeof(*p), GFP_KERNEL);
342 return ERR_PTR(-ENOMEM);
345 dev_set_promiscuity(dev, 1);
350 p->port_no = port_no;
351 spin_lock_init(&p->lock);
352 INIT_WORK(&p->port_task, NULL);
353 if (port_no != OFPP_LOCAL)
354 rcu_assign_pointer(dev->br_port, p);
355 if (port_no < OFPP_MAX)
356 rcu_assign_pointer(dp->ports[port_no], p);
357 list_add_rcu(&p->node, &dp->port_list);
362 int add_switch_port(struct datapath *dp, struct net_device *dev)
364 struct net_bridge_port *p;
367 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER
371 port_no = find_portno(dp);
375 p = new_nbp(dp, dev, port_no);
381 /* Notify the ctlpath that this port has been added */
382 dp_send_port_status(p, OFPPR_ADD);
387 /* Delete 'p' from switch. */
388 int dp_del_switch_port(struct net_bridge_port *p)
390 /* First drop references to device. */
391 cancel_work_sync(&p->port_task);
393 dev_set_promiscuity(p->dev, -1);
395 list_del_rcu(&p->node);
396 if (p->port_no != OFPP_LOCAL)
397 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
398 rcu_assign_pointer(p->dev->br_port, NULL);
400 /* Then wait until no one is still using it, and destroy it. */
403 /* Notify the ctlpath that this port no longer exists */
404 dp_send_port_status(p, OFPPR_DELETE);
412 static void del_dp(struct datapath *dp)
414 struct net_bridge_port *p, *n;
416 kthread_stop(dp->dp_task);
418 /* Drop references to DP. */
419 list_for_each_entry_safe (p, n, &dp->port_list, node)
420 dp_del_switch_port(p);
421 rcu_assign_pointer(dps[dp->dp_idx], NULL);
423 /* Kill off local_port dev references from buffered packets that have
424 * associated dst entries. */
428 /* Destroy dp->netdev. (Must follow deleting switch ports since
429 * dp->local_port has a reference to it.) */
432 /* Wait until no longer in use, then destroy it. */
434 chain_destroy(dp->chain);
436 module_put(THIS_MODULE);
439 static int dp_maint_func(void *data)
441 struct datapath *dp = (struct datapath *) data;
443 while (!kthread_should_stop()) {
444 /* Timeout old entries */
445 chain_timeout(dp->chain);
446 msleep_interruptible(MAINT_SLEEP_MSECS);
453 do_port_input(struct net_bridge_port *p, struct sk_buff *skb)
455 /* Push the Ethernet header back on. */
456 skb_push(skb, ETH_HLEN);
457 fwd_port_input(p->dp->chain, skb, p);
461 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
462 * different set of devices!)
464 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
465 /* Called with rcu_read_lock. */
466 static struct sk_buff *dp_frame_hook(struct net_bridge_port *p,
469 do_port_input(p, skb);
472 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
473 static int dp_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
475 do_port_input(p, *pskb);
479 /* NB: This has only been tested on 2.4.35 */
480 static void dp_frame_hook(struct sk_buff *skb)
482 struct net_bridge_port *p = skb->dev->br_port;
485 do_port_input(p, skb);
492 /* Forwarding output path.
493 * Based on net/bridge/br_forward.c. */
495 static inline unsigned packet_length(const struct sk_buff *skb)
497 int length = skb->len - ETH_HLEN;
498 if (skb->protocol == htons(ETH_P_8021Q))
503 /* Send packets out all the ports except the originating one. If the
504 * "flood" argument is set, only send along the minimum spanning tree.
507 output_all(struct datapath *dp, struct sk_buff *skb, int flood)
509 u32 disable = flood ? OFPPFL_NO_FLOOD : 0;
510 struct net_bridge_port *p;
513 list_for_each_entry_rcu (p, &dp->port_list, node) {
514 if (skb->dev == p->dev || p->flags & disable)
516 if (prev_port != -1) {
517 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
522 dp_output_port(dp, clone, prev_port, 0);
524 prev_port = p->port_no;
527 dp_output_port(dp, skb, prev_port, 0);
534 /* Marks 'skb' as having originated from 'in_port' in 'dp'.
535 FIXME: how are devices reference counted? */
536 int dp_set_origin(struct datapath *dp, uint16_t in_port,
539 struct net_bridge_port *p = (in_port < OFPP_MAX ? dp->ports[in_port]
540 : in_port == OFPP_LOCAL ? dp->local_port
549 static int xmit_skb(struct sk_buff *skb)
552 if (packet_length(skb) > skb->dev->mtu) {
553 printk("dropped over-mtu packet: %d > %d\n",
554 packet_length(skb), skb->dev->mtu);
564 /* Takes ownership of 'skb' and transmits it to 'out_port' on 'dp'.
566 int dp_output_port(struct datapath *dp, struct sk_buff *skb, int out_port,
572 /* Send it out the port it came in on, which is already set in
576 printk("skb device not set forwarding to in_port\n");
580 return xmit_skb(skb);
583 int retval = run_flow_through_tables(dp->chain, skb,
591 return output_all(dp, skb, 1);
594 return output_all(dp, skb, 0);
596 case OFPP_CONTROLLER:
597 return dp_output_control(dp, skb, fwd_save_skb(skb), 0,
601 struct net_device *dev = dp->netdev;
602 return dev ? dp_dev_recv(dev, skb) : -ESRCH;
605 case 0 ... OFPP_MAX-1: {
606 struct net_bridge_port *p = dp->ports[out_port];
609 if (p->dev == skb->dev) {
610 /* To send to the input port, must use OFPP_IN_PORT */
613 printk("can't directly forward to input port\n");
616 if (p->flags & OFPPFL_NO_FWD && !ignore_no_fwd) {
621 return xmit_skb(skb);
631 printk("can't forward to bad port %d\n", out_port);
635 /* Takes ownership of 'skb' and transmits it to 'dp''s control path. If
636 * 'buffer_id' != -1, then only the first 64 bytes of 'skb' are sent;
637 * otherwise, all of 'skb' is sent. 'reason' indicates why 'skb' is being
638 * sent. 'max_len' sets the maximum number of bytes that the caller
639 * wants to be sent; a value of 0 indicates the entire packet should be
642 dp_output_control(struct datapath *dp, struct sk_buff *skb,
643 uint32_t buffer_id, size_t max_len, int reason)
645 /* FIXME? Can we avoid creating a new skbuff in the case where we
646 * forward the whole packet? */
647 struct sk_buff *f_skb;
648 struct ofp_packet_in *opi;
649 struct net_bridge_port *p;
650 size_t fwd_len, opi_len;
654 if ((buffer_id != (uint32_t) -1) && max_len)
655 fwd_len = min(fwd_len, max_len);
657 opi_len = offsetof(struct ofp_packet_in, data) + fwd_len;
658 opi = alloc_openflow_skb(dp, opi_len, OFPT_PACKET_IN, NULL, &f_skb);
663 opi->buffer_id = htonl(buffer_id);
664 opi->total_len = htons(skb->len);
665 p = skb->dev->br_port;
666 opi->in_port = htons(p ? p->port_no : OFPP_LOCAL);
667 opi->reason = reason;
669 memcpy(opi->data, skb_mac_header(skb), fwd_len);
670 err = send_openflow_skb(f_skb, NULL);
677 static void fill_port_desc(struct net_bridge_port *p, struct ofp_phy_port *desc)
680 desc->port_no = htons(p->port_no);
681 strncpy(desc->name, p->dev->name, OFP_MAX_PORT_NAME_LEN);
682 desc->name[OFP_MAX_PORT_NAME_LEN-1] = '\0';
683 memcpy(desc->hw_addr, p->dev->dev_addr, ETH_ALEN);
688 spin_lock_irqsave(&p->lock, flags);
689 desc->flags = htonl(p->flags | p->status);
690 spin_unlock_irqrestore(&p->lock, flags);
692 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,24)
693 if (p->dev->ethtool_ops && p->dev->ethtool_ops->get_settings) {
694 struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
696 if (!p->dev->ethtool_ops->get_settings(p->dev, &ecmd)) {
697 if (ecmd.supported & SUPPORTED_10baseT_Half)
698 desc->features |= OFPPF_10MB_HD;
699 if (ecmd.supported & SUPPORTED_10baseT_Full)
700 desc->features |= OFPPF_10MB_FD;
701 if (ecmd.supported & SUPPORTED_100baseT_Half)
702 desc->features |= OFPPF_100MB_HD;
703 if (ecmd.supported & SUPPORTED_100baseT_Full)
704 desc->features |= OFPPF_100MB_FD;
705 if (ecmd.supported & SUPPORTED_1000baseT_Half)
706 desc->features |= OFPPF_1GB_HD;
707 if (ecmd.supported & SUPPORTED_1000baseT_Full)
708 desc->features |= OFPPF_1GB_FD;
709 /* 10Gbps half-duplex doesn't exist... */
710 if (ecmd.supported & SUPPORTED_10000baseT_Full)
711 desc->features |= OFPPF_10GB_FD;
713 desc->speed = htonl(ecmd.speed);
717 desc->features = htonl(desc->features);
721 fill_features_reply(struct datapath *dp, struct ofp_switch_features *ofr)
723 struct net_bridge_port *p;
726 ofr->datapath_id = cpu_to_be64(dp->id);
728 ofr->n_buffers = htonl(N_PKT_BUFFERS);
729 ofr->n_tables = dp->chain->n_tables;
730 ofr->capabilities = htonl(OFP_SUPPORTED_CAPABILITIES);
731 ofr->actions = htonl(OFP_SUPPORTED_ACTIONS);
732 memset(ofr->pad, 0, sizeof ofr->pad);
734 list_for_each_entry_rcu (p, &dp->port_list, node) {
735 fill_port_desc(p, &ofr->ports[port_count]);
743 dp_send_features_reply(struct datapath *dp, const struct sender *sender)
746 struct ofp_switch_features *ofr;
747 size_t ofr_len, port_max_len;
751 port_max_len = sizeof(struct ofp_phy_port) * OFPP_MAX;
752 ofr = alloc_openflow_skb(dp, sizeof(*ofr) + port_max_len,
753 OFPT_FEATURES_REPLY, sender, &skb);
758 port_count = fill_features_reply(dp, ofr);
761 ofr_len = sizeof(*ofr) + (sizeof(struct ofp_phy_port) * port_count);
762 resize_openflow_skb(skb, &ofr->header, ofr_len);
763 return send_openflow_skb(skb, sender);
767 dp_send_config_reply(struct datapath *dp, const struct sender *sender)
770 struct ofp_switch_config *osc;
772 osc = alloc_openflow_skb(dp, sizeof *osc, OFPT_GET_CONFIG_REPLY, sender,
777 osc->flags = htons(dp->flags);
778 osc->miss_send_len = htons(dp->miss_send_len);
780 return send_openflow_skb(skb, sender);
784 dp_send_hello(struct datapath *dp, const struct sender *sender,
785 const struct ofp_header *request)
787 if (request->version < OFP_VERSION) {
789 sprintf(err, "Only version 0x%02x supported", OFP_VERSION);
790 dp_send_error_msg(dp, sender, OFPET_HELLO_FAILED,
791 OFPHFC_INCOMPATIBLE, err, strlen(err));
795 struct ofp_header *reply;
797 reply = alloc_openflow_skb(dp, sizeof *reply,
798 OFPT_HELLO, sender, &skb);
802 return send_openflow_skb(skb, sender);
806 /* Callback function for a workqueue to disable an interface */
808 down_port_cb(struct work_struct *work)
810 struct net_bridge_port *p = container_of(work, struct net_bridge_port,
814 if (dev_change_flags(p->dev, p->dev->flags & ~IFF_UP) < 0)
816 printk("problem bringing up port %s\n", p->dev->name);
818 p->status |= OFPPFL_PORT_DOWN;
821 /* Callback function for a workqueue to enable an interface */
823 up_port_cb(struct work_struct *work)
825 struct net_bridge_port *p = container_of(work, struct net_bridge_port,
829 if (dev_change_flags(p->dev, p->dev->flags | IFF_UP) < 0)
831 printk("problem bringing down port %s\n", p->dev->name);
833 p->status &= ~OFPPFL_PORT_DOWN;
837 dp_update_port_flags(struct datapath *dp, const struct ofp_port_mod *opm)
839 unsigned long int flags;
840 const struct ofp_phy_port *opp = &opm->desc;
841 int port_no = ntohs(opp->port_no);
842 struct net_bridge_port *p = (port_no < OFPP_MAX ? dp->ports[port_no]
843 : port_no == OFPP_LOCAL ? dp->local_port
847 /* Make sure the port id hasn't changed since this was sent */
848 if (!p || memcmp(opp->hw_addr, p->dev->dev_addr, ETH_ALEN))
851 spin_lock_irqsave(&p->lock, flags);
852 flag_mask = ntohl(opm->mask) & PORT_FLAG_BITS;
854 p->flags &= ~flag_mask;
855 p->flags |= ntohl(opp->flags) & flag_mask;
858 /* Modifying the status of an interface requires taking a lock
859 * that cannot be done from here. For this reason, we use a shared
860 * workqueue, which will cause it to be executed from a safer
862 if (opm->mask & htonl(OFPPFL_PORT_DOWN)) {
863 if ((opp->flags & htonl(OFPPFL_PORT_DOWN))
864 && (p->status & OFPPFL_PORT_DOWN) == 0) {
865 PREPARE_WORK(&p->port_task, down_port_cb);
866 schedule_work(&p->port_task);
867 } else if ((opp->flags & htonl(OFPPFL_PORT_DOWN)) == 0
868 && (p->status & OFPPFL_PORT_DOWN)) {
869 PREPARE_WORK(&p->port_task, up_port_cb);
870 schedule_work(&p->port_task);
873 spin_unlock_irqrestore(&p->lock, flags);
878 /* Initialize the port status field of the bridge port. */
880 init_port_status(struct net_bridge_port *p)
882 unsigned long int flags;
884 spin_lock_irqsave(&p->lock, flags);
886 if (p->dev->flags & IFF_UP)
887 p->status &= ~OFPPFL_PORT_DOWN;
889 p->status |= OFPPFL_PORT_DOWN;
891 if (netif_carrier_ok(p->dev))
892 p->status &= ~OFPPFL_LINK_DOWN;
894 p->status |= OFPPFL_LINK_DOWN;
896 spin_unlock_irqrestore(&p->lock, flags);
900 dp_send_port_status(struct net_bridge_port *p, uint8_t status)
903 struct ofp_port_status *ops;
905 ops = alloc_openflow_skb(p->dp, sizeof *ops, OFPT_PORT_STATUS, NULL,
909 ops->reason = status;
910 memset(ops->pad, 0, sizeof ops->pad);
911 fill_port_desc(p, &ops->desc);
913 return send_openflow_skb(skb, NULL);
917 dp_send_flow_expired(struct datapath *dp, struct sw_flow *flow,
918 enum ofp_flow_expired_reason reason)
921 struct ofp_flow_expired *ofe;
923 if (!(dp->flags & OFPC_SEND_FLOW_EXP))
926 ofe = alloc_openflow_skb(dp, sizeof *ofe, OFPT_FLOW_EXPIRED, 0, &skb);
930 flow_fill_match(&ofe->match, &flow->key);
932 ofe->priority = htons(flow->priority);
933 ofe->reason = reason;
934 memset(ofe->pad, 0, sizeof ofe->pad);
936 ofe->duration = htonl((jiffies - flow->init_time) / HZ);
937 memset(ofe->pad2, 0, sizeof ofe->pad2);
938 ofe->packet_count = cpu_to_be64(flow->packet_count);
939 ofe->byte_count = cpu_to_be64(flow->byte_count);
941 return send_openflow_skb(skb, NULL);
943 EXPORT_SYMBOL(dp_send_flow_expired);
946 dp_send_error_msg(struct datapath *dp, const struct sender *sender,
947 uint16_t type, uint16_t code, const void *data, size_t len)
950 struct ofp_error_msg *oem;
953 oem = alloc_openflow_skb(dp, sizeof(*oem)+len, OFPT_ERROR,
958 oem->type = htons(type);
959 oem->code = htons(code);
960 memcpy(oem->data, data, len);
962 return send_openflow_skb(skb, sender);
966 dp_send_echo_reply(struct datapath *dp, const struct sender *sender,
967 const struct ofp_header *rq)
970 struct ofp_header *reply;
972 reply = alloc_openflow_skb(dp, ntohs(rq->length), OFPT_ECHO_REPLY,
977 memcpy(reply + 1, rq + 1, ntohs(rq->length) - sizeof *rq);
978 return send_openflow_skb(skb, sender);
981 /* Generic Netlink interface.
983 * See netlink(7) for an introduction to netlink. See
984 * http://linux-net.osdl.org/index.php/Netlink for more information and
985 * pointers on how to work with netlink and Generic Netlink in the kernel and
988 static struct genl_family dp_genl_family = {
989 .id = GENL_ID_GENERATE,
991 .name = DP_GENL_FAMILY_NAME,
993 .maxattr = DP_GENL_A_MAX,
996 /* Attribute policy: what each attribute may contain. */
997 static struct nla_policy dp_genl_policy[DP_GENL_A_MAX + 1] = {
998 [DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
999 [DP_GENL_A_MC_GROUP] = { .type = NLA_U32 },
1000 [DP_GENL_A_PORTNAME] = { .type = NLA_STRING }
1003 static int dp_genl_add(struct sk_buff *skb, struct genl_info *info)
1005 if (!info->attrs[DP_GENL_A_DP_IDX])
1008 return new_dp(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
1011 static struct genl_ops dp_genl_ops_add_dp = {
1012 .cmd = DP_GENL_C_ADD_DP,
1013 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1014 .policy = dp_genl_policy,
1015 .doit = dp_genl_add,
1019 struct datapath *dp_get(int dp_idx)
1021 if (dp_idx < 0 || dp_idx > DP_MAX)
1023 return rcu_dereference(dps[dp_idx]);
1026 static int dp_genl_del(struct sk_buff *skb, struct genl_info *info)
1028 struct datapath *dp;
1031 if (!info->attrs[DP_GENL_A_DP_IDX])
1034 dp = dp_get(nla_get_u32((info->attrs[DP_GENL_A_DP_IDX])));
1044 static struct genl_ops dp_genl_ops_del_dp = {
1045 .cmd = DP_GENL_C_DEL_DP,
1046 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1047 .policy = dp_genl_policy,
1048 .doit = dp_genl_del,
1052 /* Queries a datapath for related information. Currently the only relevant
1053 * information is the datapath's multicast group ID. Really we want one
1054 * multicast group per datapath, but because of locking issues[*] we can't
1055 * easily get one. Thus, every datapath will currently return the same
1056 * global multicast group ID, but in the future it would be nice to fix that.
1058 * [*] dp_genl_add, to add a new datapath, is called under the genl_lock
1059 * mutex, and genl_register_mc_group, called to acquire a new multicast
1060 * group ID, also acquires genl_lock, thus deadlock.
1062 static int dp_genl_query(struct sk_buff *skb, struct genl_info *info)
1064 struct datapath *dp;
1065 struct sk_buff *ans_skb = NULL;
1069 if (!info->attrs[DP_GENL_A_DP_IDX])
1073 dp_idx = nla_get_u32((info->attrs[DP_GENL_A_DP_IDX]));
1074 dp = dp_get(dp_idx);
1079 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1084 data = genlmsg_put_reply(ans_skb, info, &dp_genl_family,
1085 0, DP_GENL_C_QUERY_DP);
1090 NLA_PUT_U32(ans_skb, DP_GENL_A_DP_IDX, dp_idx);
1091 NLA_PUT_U32(ans_skb, DP_GENL_A_MC_GROUP, mc_group.id);
1093 genlmsg_end(ans_skb, data);
1094 err = genlmsg_reply(ans_skb, info);
1106 static struct genl_ops dp_genl_ops_query_dp = {
1107 .cmd = DP_GENL_C_QUERY_DP,
1108 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1109 .policy = dp_genl_policy,
1110 .doit = dp_genl_query,
1114 static int dp_genl_add_del_port(struct sk_buff *skb, struct genl_info *info)
1116 struct datapath *dp;
1117 struct net_device *port;
1120 if (!info->attrs[DP_GENL_A_DP_IDX] || !info->attrs[DP_GENL_A_PORTNAME])
1124 dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
1130 /* Get interface to add/remove. */
1131 port = dev_get_by_name(&init_net,
1132 nla_data(info->attrs[DP_GENL_A_PORTNAME]));
1138 /* Execute operation. */
1139 if (info->genlhdr->cmd == DP_GENL_C_ADD_PORT)
1140 err = add_switch_port(dp, port);
1142 if (port->br_port == NULL || port->br_port->dp != dp) {
1146 err = dp_del_switch_port(port->br_port);
1155 static struct genl_ops dp_genl_ops_add_port = {
1156 .cmd = DP_GENL_C_ADD_PORT,
1157 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1158 .policy = dp_genl_policy,
1159 .doit = dp_genl_add_del_port,
1163 static struct genl_ops dp_genl_ops_del_port = {
1164 .cmd = DP_GENL_C_DEL_PORT,
1165 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1166 .policy = dp_genl_policy,
1167 .doit = dp_genl_add_del_port,
1171 static int dp_genl_openflow(struct sk_buff *skb, struct genl_info *info)
1173 struct nlattr *va = info->attrs[DP_GENL_A_OPENFLOW];
1174 struct datapath *dp;
1175 struct ofp_header *oh;
1176 struct sender sender;
1179 if (!info->attrs[DP_GENL_A_DP_IDX] || !va)
1182 dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
1186 if (nla_len(va) < sizeof(struct ofp_header))
1190 sender.xid = oh->xid;
1191 sender.pid = info->snd_pid;
1192 sender.seq = info->snd_seq;
1194 mutex_lock(&dp_mutex);
1195 err = fwd_control_input(dp->chain, &sender,
1196 nla_data(va), nla_len(va));
1197 mutex_unlock(&dp_mutex);
1201 static struct nla_policy dp_genl_openflow_policy[DP_GENL_A_MAX + 1] = {
1202 [DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
1205 static int desc_stats_dump(struct datapath *dp, void *state,
1206 void *body, int *body_len)
1208 struct ofp_desc_stats *ods = body;
1209 int n_bytes = sizeof *ods;
1211 if (n_bytes > *body_len) {
1214 *body_len = n_bytes;
1216 strncpy(ods->mfr_desc, mfr_desc, sizeof ods->mfr_desc);
1217 strncpy(ods->hw_desc, hw_desc, sizeof ods->hw_desc);
1218 strncpy(ods->sw_desc, sw_desc, sizeof ods->sw_desc);
1219 strncpy(ods->serial_num, serial_num, sizeof ods->serial_num);
1224 struct flow_stats_state {
1226 struct sw_table_position position;
1227 const struct ofp_flow_stats_request *rq;
1230 int bytes_used, bytes_allocated;
1233 static int flow_stats_init(struct datapath *dp, const void *body, int body_len,
1236 const struct ofp_flow_stats_request *fsr = body;
1237 struct flow_stats_state *s = kmalloc(sizeof *s, GFP_ATOMIC);
1240 s->table_idx = fsr->table_id == 0xff ? 0 : fsr->table_id;
1241 memset(&s->position, 0, sizeof s->position);
1247 static int flow_stats_dump_callback(struct sw_flow *flow, void *private)
1249 struct sw_flow_actions *sf_acts = rcu_dereference(flow->sf_acts);
1250 struct flow_stats_state *s = private;
1251 struct ofp_flow_stats *ofs;
1255 actions_length = sizeof *ofs->actions * sf_acts->n_actions;
1256 length = sizeof *ofs + actions_length;
1257 if (length + s->bytes_used > s->bytes_allocated)
1260 ofs = s->body + s->bytes_used;
1261 ofs->length = htons(length);
1262 ofs->table_id = s->table_idx;
1264 ofs->match.wildcards = htonl(flow->key.wildcards);
1265 ofs->match.in_port = flow->key.in_port;
1266 memcpy(ofs->match.dl_src, flow->key.dl_src, ETH_ALEN);
1267 memcpy(ofs->match.dl_dst, flow->key.dl_dst, ETH_ALEN);
1268 ofs->match.dl_vlan = flow->key.dl_vlan;
1269 ofs->match.dl_type = flow->key.dl_type;
1270 ofs->match.nw_src = flow->key.nw_src;
1271 ofs->match.nw_dst = flow->key.nw_dst;
1272 ofs->match.nw_proto = flow->key.nw_proto;
1274 ofs->match.tp_src = flow->key.tp_src;
1275 ofs->match.tp_dst = flow->key.tp_dst;
1276 ofs->duration = htonl((jiffies - flow->init_time) / HZ);
1277 ofs->priority = htons(flow->priority);
1278 ofs->idle_timeout = htons(flow->idle_timeout);
1279 ofs->hard_timeout = htons(flow->hard_timeout);
1280 memset(ofs->pad2, 0, sizeof ofs->pad2);
1281 ofs->packet_count = cpu_to_be64(flow->packet_count);
1282 ofs->byte_count = cpu_to_be64(flow->byte_count);
1283 memcpy(ofs->actions, sf_acts->actions, actions_length);
1285 s->bytes_used += length;
1289 static int flow_stats_dump(struct datapath *dp, void *state,
1290 void *body, int *body_len)
1292 struct flow_stats_state *s = state;
1293 struct sw_flow_key match_key;
1297 s->bytes_allocated = *body_len;
1300 flow_extract_match(&match_key, &s->rq->match);
1301 while (s->table_idx < dp->chain->n_tables
1302 && (s->rq->table_id == 0xff || s->rq->table_id == s->table_idx))
1304 struct sw_table *table = dp->chain->tables[s->table_idx];
1306 error = table->iterate(table, &match_key, &s->position,
1307 flow_stats_dump_callback, s);
1312 memset(&s->position, 0, sizeof s->position);
1314 *body_len = s->bytes_used;
1316 /* If error is 0, we're done.
1317 * Otherwise, if some bytes were used, there are more flows to come.
1318 * Otherwise, we were not able to fit even a single flow in the body,
1319 * which indicates that we have a single flow with too many actions to
1320 * fit. We won't ever make any progress at that rate, so give up. */
1321 return !error ? 0 : s->bytes_used ? 1 : -ENOMEM;
1324 static void flow_stats_done(void *state)
1329 static int aggregate_stats_init(struct datapath *dp,
1330 const void *body, int body_len,
1333 *state = (void *)body;
1337 static int aggregate_stats_dump_callback(struct sw_flow *flow, void *private)
1339 struct ofp_aggregate_stats_reply *rpy = private;
1340 rpy->packet_count += flow->packet_count;
1341 rpy->byte_count += flow->byte_count;
1346 static int aggregate_stats_dump(struct datapath *dp, void *state,
1347 void *body, int *body_len)
1349 struct ofp_aggregate_stats_request *rq = state;
1350 struct ofp_aggregate_stats_reply *rpy;
1351 struct sw_table_position position;
1352 struct sw_flow_key match_key;
1355 if (*body_len < sizeof *rpy)
1358 *body_len = sizeof *rpy;
1360 memset(rpy, 0, sizeof *rpy);
1362 flow_extract_match(&match_key, &rq->match);
1363 table_idx = rq->table_id == 0xff ? 0 : rq->table_id;
1364 memset(&position, 0, sizeof position);
1365 while (table_idx < dp->chain->n_tables
1366 && (rq->table_id == 0xff || rq->table_id == table_idx))
1368 struct sw_table *table = dp->chain->tables[table_idx];
1371 error = table->iterate(table, &match_key, &position,
1372 aggregate_stats_dump_callback, rpy);
1377 memset(&position, 0, sizeof position);
1380 rpy->packet_count = cpu_to_be64(rpy->packet_count);
1381 rpy->byte_count = cpu_to_be64(rpy->byte_count);
1382 rpy->flow_count = htonl(rpy->flow_count);
1386 static int table_stats_dump(struct datapath *dp, void *state,
1387 void *body, int *body_len)
1389 struct ofp_table_stats *ots;
1390 int n_bytes = dp->chain->n_tables * sizeof *ots;
1392 if (n_bytes > *body_len)
1394 *body_len = n_bytes;
1395 for (i = 0, ots = body; i < dp->chain->n_tables; i++, ots++) {
1396 struct sw_table_stats stats;
1397 dp->chain->tables[i]->stats(dp->chain->tables[i], &stats);
1398 strncpy(ots->name, stats.name, sizeof ots->name);
1400 ots->wildcards = htonl(stats.wildcards);
1401 memset(ots->pad, 0, sizeof ots->pad);
1402 ots->max_entries = htonl(stats.max_flows);
1403 ots->active_count = htonl(stats.n_flows);
1404 ots->lookup_count = cpu_to_be64(stats.n_lookup);
1405 ots->matched_count = cpu_to_be64(stats.n_matched);
1410 struct port_stats_state {
1414 static int port_stats_init(struct datapath *dp, const void *body, int body_len,
1417 struct port_stats_state *s = kmalloc(sizeof *s, GFP_ATOMIC);
1425 static int port_stats_dump(struct datapath *dp, void *state,
1426 void *body, int *body_len)
1428 struct port_stats_state *s = state;
1429 struct ofp_port_stats *ops;
1430 int n_ports, max_ports;
1433 max_ports = *body_len / sizeof *ops;
1439 for (i = s->port; i < OFPP_MAX && n_ports < max_ports; i++) {
1440 struct net_bridge_port *p = dp->ports[i];
1441 struct net_device_stats *stats;
1444 stats = p->dev->get_stats(p->dev);
1445 ops->port_no = htons(p->port_no);
1446 memset(ops->pad, 0, sizeof ops->pad);
1447 ops->rx_packets = cpu_to_be64(stats->rx_packets);
1448 ops->tx_packets = cpu_to_be64(stats->tx_packets);
1449 ops->rx_bytes = cpu_to_be64(stats->rx_bytes);
1450 ops->tx_bytes = cpu_to_be64(stats->tx_bytes);
1451 ops->rx_dropped = cpu_to_be64(stats->rx_dropped);
1452 ops->tx_dropped = cpu_to_be64(stats->tx_dropped);
1453 ops->rx_errors = cpu_to_be64(stats->rx_errors);
1454 ops->tx_errors = cpu_to_be64(stats->tx_errors);
1455 ops->rx_frame_err = cpu_to_be64(stats->rx_frame_errors);
1456 ops->rx_over_err = cpu_to_be64(stats->rx_over_errors);
1457 ops->rx_crc_err = cpu_to_be64(stats->rx_crc_errors);
1458 ops->collisions = cpu_to_be64(stats->collisions);
1463 *body_len = n_ports * sizeof *ops;
1464 return n_ports >= max_ports;
1467 static void port_stats_done(void *state)
1473 /* Minimum and maximum acceptable number of bytes in body member of
1474 * struct ofp_stats_request. */
1475 size_t min_body, max_body;
1477 /* Prepares to dump some kind of statistics on 'dp'. 'body' and
1478 * 'body_len' are the 'body' member of the struct ofp_stats_request.
1479 * Returns zero if successful, otherwise a negative error code.
1480 * May initialize '*state' to state information. May be null if no
1481 * initialization is required.*/
1482 int (*init)(struct datapath *dp, const void *body, int body_len,
1485 /* Dumps statistics for 'dp' into the '*body_len' bytes at 'body', and
1486 * modifies '*body_len' to reflect the number of bytes actually used.
1487 * ('body' will be transmitted as the 'body' member of struct
1488 * ofp_stats_reply.) */
1489 int (*dump)(struct datapath *dp, void *state,
1490 void *body, int *body_len);
1492 /* Cleans any state created by the init or dump functions. May be null
1493 * if no cleanup is required. */
1494 void (*done)(void *state);
1497 static const struct stats_type stats[] = {
1506 sizeof(struct ofp_flow_stats_request),
1507 sizeof(struct ofp_flow_stats_request),
1512 [OFPST_AGGREGATE] = {
1513 sizeof(struct ofp_aggregate_stats_request),
1514 sizeof(struct ofp_aggregate_stats_request),
1515 aggregate_stats_init,
1516 aggregate_stats_dump,
1536 dp_genl_openflow_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
1538 struct datapath *dp;
1539 struct sender sender;
1540 const struct stats_type *s;
1541 struct ofp_stats_reply *osr;
1543 int max_openflow_len, body_len;
1547 /* Set up the cleanup function for this dump. Linux 2.6.20 and later
1548 * support setting up cleanup functions via the .doneit member of
1549 * struct genl_ops. This kluge supports earlier versions also. */
1550 cb->done = dp_genl_openflow_done;
1552 sender.pid = NETLINK_CB(cb->skb).pid;
1553 sender.seq = cb->nlh->nlmsg_seq;
1555 struct nlattr *attrs[DP_GENL_A_MAX + 1];
1556 struct ofp_stats_request *rq;
1558 size_t len, body_len;
1561 err = nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs, DP_GENL_A_MAX,
1562 dp_genl_openflow_policy);
1566 if (!attrs[DP_GENL_A_DP_IDX])
1568 dp_idx = nla_get_u16(attrs[DP_GENL_A_DP_IDX]);
1569 dp = dp_get(dp_idx);
1573 va = attrs[DP_GENL_A_OPENFLOW];
1575 if (!va || len < sizeof *rq)
1579 sender.xid = rq->header.xid;
1580 type = ntohs(rq->type);
1581 if (rq->header.version != OFP_VERSION) {
1582 dp_send_error_msg(dp, &sender, OFPET_BAD_REQUEST,
1583 OFPBRC_BAD_VERSION, rq, len);
1586 if (rq->header.type != OFPT_STATS_REQUEST
1587 || ntohs(rq->header.length) != len)
1590 if (type >= ARRAY_SIZE(stats) || !stats[type].dump) {
1591 dp_send_error_msg(dp, &sender, OFPET_BAD_REQUEST,
1592 OFPBRC_BAD_STAT, rq, len);
1597 body_len = len - offsetof(struct ofp_stats_request, body);
1598 if (body_len < s->min_body || body_len > s->max_body)
1602 cb->args[1] = dp_idx;
1604 cb->args[3] = rq->header.xid;
1607 err = s->init(dp, rq->body, body_len, &state);
1610 cb->args[4] = (long) state;
1612 } else if (cb->args[0] == 1) {
1613 sender.xid = cb->args[3];
1614 dp_idx = cb->args[1];
1615 s = &stats[cb->args[2]];
1617 dp = dp_get(dp_idx);
1624 osr = put_openflow_headers(dp, skb, OFPT_STATS_REPLY, &sender,
1627 return PTR_ERR(osr);
1628 osr->type = htons(s - stats);
1630 resize_openflow_skb(skb, &osr->header, max_openflow_len);
1632 body_len = max_openflow_len - offsetof(struct ofp_stats_reply, body);
1634 err = s->dump(dp, (void *) cb->args[4], body, &body_len);
1639 osr->flags = ntohs(OFPSF_REPLY_MORE);
1640 resize_openflow_skb(skb, &osr->header,
1641 (offsetof(struct ofp_stats_reply, body)
1650 dp_genl_openflow_done(struct netlink_callback *cb)
1653 const struct stats_type *s = &stats[cb->args[2]];
1655 s->done((void *) cb->args[4]);
1660 static struct genl_ops dp_genl_ops_openflow = {
1661 .cmd = DP_GENL_C_OPENFLOW,
1662 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1663 .policy = dp_genl_openflow_policy,
1664 .doit = dp_genl_openflow,
1665 .dumpit = dp_genl_openflow_dumpit,
1668 static struct genl_ops *dp_genl_all_ops[] = {
1669 /* Keep this operation first. Generic Netlink dispatching
1670 * looks up operations with linear search, so we want it at the
1672 &dp_genl_ops_openflow,
1674 &dp_genl_ops_add_dp,
1675 &dp_genl_ops_del_dp,
1676 &dp_genl_ops_query_dp,
1677 &dp_genl_ops_add_port,
1678 &dp_genl_ops_del_port,
1681 static int dp_init_netlink(void)
1686 err = genl_register_family(&dp_genl_family);
1690 for (i = 0; i < ARRAY_SIZE(dp_genl_all_ops); i++) {
1691 err = genl_register_ops(&dp_genl_family, dp_genl_all_ops[i]);
1693 goto err_unregister;
1696 strcpy(mc_group.name, "openflow");
1697 err = genl_register_mc_group(&dp_genl_family, &mc_group);
1699 goto err_unregister;
1704 genl_unregister_family(&dp_genl_family);
1708 static void dp_uninit_netlink(void)
1710 genl_unregister_family(&dp_genl_family);
1713 static int __init dp_init(void)
1717 printk("OpenFlow "VERSION", built "__DATE__" "__TIME__", "
1718 "protocol 0x%02x\n", OFP_VERSION);
1724 err = register_netdevice_notifier(&dp_device_notifier);
1726 goto error_flow_exit;
1728 err = dp_init_netlink();
1730 goto error_unreg_notifier;
1732 /* Hook into callback used by the bridge to intercept packets.
1733 * Parasites we are. */
1734 if (br_handle_frame_hook)
1735 printk("openflow: hijacking bridge hook\n");
1736 br_handle_frame_hook = dp_frame_hook;
1740 error_unreg_notifier:
1741 unregister_netdevice_notifier(&dp_device_notifier);
1745 printk(KERN_EMERG "openflow: failed to install!");
1749 static void dp_cleanup(void)
1752 dp_uninit_netlink();
1753 unregister_netdevice_notifier(&dp_device_notifier);
1755 br_handle_frame_hook = NULL;
1758 module_init(dp_init);
1759 module_exit(dp_cleanup);
1761 MODULE_DESCRIPTION("OpenFlow switching datapath");
1762 MODULE_AUTHOR("Copyright (c) 2007, 2008 The Board of Trustees of The Leland Stanford Junior University");
1763 MODULE_LICENSE("GPL");