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/netfilter_ipv4.h>
30 #include <linux/inetdevice.h>
31 #include <linux/list.h>
32 #include <linux/rculist.h>
33 #include <linux/workqueue.h>
35 #include "openflow-netlink.h"
37 #include "nx_act_snat.h"
47 /* Strings to describe the manufacturer, hardware, and software. This data
48 * is queriable through the switch description stats message. */
49 static char mfr_desc[DESC_STR_LEN] = "Nicira Networks";
50 static char hw_desc[DESC_STR_LEN] = "Reference Linux Kernel Module";
51 static char sw_desc[DESC_STR_LEN] = VERSION;
52 static char serial_num[SERIAL_NUM_LEN] = "None";
54 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
55 module_param_string(mfr_desc, mfr_desc, sizeof mfr_desc, 0444);
56 module_param_string(hw_desc, hw_desc, sizeof hw_desc, 0444);
57 module_param_string(sw_desc, sw_desc, sizeof sw_desc, 0444);
58 module_param_string(serial_num, serial_num, sizeof serial_num, 0444);
60 MODULE_PARM(mfr_desc, "s");
61 MODULE_PARM(hw_desc, "s");
62 MODULE_PARM(sw_desc, "s");
63 MODULE_PARM(serial_num, "s");
67 /* Number of milliseconds between runs of the maintenance thread. */
68 #define MAINT_SLEEP_MSECS 1000
70 #define UINT32_MAX 4294967295U
71 #define UINT16_MAX 65535
72 #define MAX(X, Y) ((X) > (Y) ? (X) : (Y))
74 static struct genl_family dp_genl_family;
75 static struct genl_multicast_group mc_group;
77 /* It's hard to imagine wanting more than one datapath, but... */
80 /* Datapaths. Protected on the read side by rcu_read_lock, on the write side
81 * by dp_mutex. dp_mutex is almost completely redundant with genl_mutex
82 * maintained by the Generic Netlink code, but the timeout path needs mutual
85 * It is safe to access the datapath and net_bridge_port structures with just
88 static struct datapath *dps[DP_MAX];
89 DEFINE_MUTEX(dp_mutex);
90 EXPORT_SYMBOL(dp_mutex);
92 static int dp_maint_func(void *data);
93 static void init_port_status(struct net_bridge_port *p);
94 static int dp_genl_openflow_done(struct netlink_callback *);
95 static struct net_bridge_port *new_nbp(struct datapath *,
96 struct net_device *, int port_no);
98 /* nla_shrink - reduce amount of space reserved by nla_reserve
99 * @skb: socket buffer from which to recover room
100 * @nla: netlink attribute to adjust
101 * @len: new length of attribute payload
103 * Reduces amount of space reserved by a call to nla_reserve.
105 * No other attributes may be added between calling nla_reserve and this
106 * function, since it will create a hole in the message.
108 void nla_shrink(struct sk_buff *skb, struct nlattr *nla, int len)
110 int delta = nla_total_size(len) - nla_total_size(nla_len(nla));
114 nla->nla_len = nla_attr_size(len);
117 /* Puts a set of openflow headers for a message of the given 'type' into 'skb'.
118 * If 'sender' is nonnull, then it is used as the message's destination. 'dp'
119 * must specify the datapath to use.
121 * '*max_openflow_len' receives the maximum number of bytes that are available
122 * for the embedded OpenFlow message. The caller must call
123 * resize_openflow_skb() to set the actual size of the message to this number
126 * Returns the openflow header if successful, otherwise (if 'skb' is too small)
129 put_openflow_headers(struct datapath *dp, struct sk_buff *skb, uint8_t type,
130 const struct sender *sender, int *max_openflow_len)
132 struct ofp_header *oh;
136 /* Assemble the Generic Netlink wrapper. */
137 if (!genlmsg_put(skb,
138 sender ? sender->pid : 0,
139 sender ? sender->seq : 0,
140 &dp_genl_family, 0, DP_GENL_C_OPENFLOW))
141 return ERR_PTR(-ENOBUFS);
142 if (nla_put_u32(skb, DP_GENL_A_DP_IDX, dp->dp_idx) < 0)
143 return ERR_PTR(-ENOBUFS);
144 openflow_len = (skb_tailroom(skb) - NLA_HDRLEN) & ~(NLA_ALIGNTO - 1);
145 if (openflow_len < sizeof *oh)
146 return ERR_PTR(-ENOBUFS);
147 *max_openflow_len = openflow_len;
148 attr = nla_reserve(skb, DP_GENL_A_OPENFLOW, openflow_len);
151 /* Fill in the header. The caller is responsible for the length. */
153 oh->version = OFP_VERSION;
155 oh->xid = sender ? sender->xid : 0;
160 /* Resizes OpenFlow header 'oh', which must be at the tail end of 'skb', to new
161 * length 'new_length' (in bytes), adjusting pointers and size values as
164 resize_openflow_skb(struct sk_buff *skb,
165 struct ofp_header *oh, size_t new_length)
167 struct nlattr *attr = ((void *) oh) - NLA_HDRLEN;
168 nla_shrink(skb, attr, new_length);
169 oh->length = htons(new_length);
170 nlmsg_end(skb, (struct nlmsghdr *) skb->data);
173 /* Allocates a new skb to contain an OpenFlow message 'openflow_len' bytes in
174 * length. Returns a null pointer if memory is unavailable, otherwise returns
175 * the OpenFlow header and stores a pointer to the skb in '*pskb'.
177 * 'type' is the OpenFlow message type. If 'sender' is nonnull, then it is
178 * used as the message's destination. 'dp' must specify the datapath to
181 alloc_openflow_skb(struct datapath *dp, size_t openflow_len, uint8_t type,
182 const struct sender *sender, struct sk_buff **pskb)
184 struct ofp_header *oh;
187 int max_openflow_len;
189 if ((openflow_len + sizeof(struct ofp_header)) > UINT16_MAX) {
191 printk("alloc_openflow_skb: openflow message too large: %zu\n",
196 genl_len = nlmsg_total_size(GENL_HDRLEN + dp_genl_family.hdrsize);
197 genl_len += nla_total_size(sizeof(uint32_t)); /* DP_GENL_A_DP_IDX */
198 genl_len += nla_total_size(openflow_len); /* DP_GENL_A_OPENFLOW */
199 skb = *pskb = genlmsg_new(genl_len, GFP_ATOMIC);
202 printk("alloc_openflow_skb: genlmsg_new failed\n");
206 oh = put_openflow_headers(dp, skb, type, sender, &max_openflow_len);
207 BUG_ON(!oh || IS_ERR(oh));
208 resize_openflow_skb(skb, oh, openflow_len);
213 /* Sends 'skb' to 'sender' if it is nonnull, otherwise multicasts 'skb' to all
216 send_openflow_skb(struct sk_buff *skb, const struct sender *sender)
219 ? genlmsg_unicast(skb, sender->pid)
220 : genlmsg_multicast(skb, 0, mc_group.id, GFP_ATOMIC));
223 /* Generates a unique datapath id. It incorporates the datapath index
224 * and a hardware address, if available. If not, it generates a random
228 uint64_t gen_datapath_id(uint16_t dp_idx)
232 struct net_device *dev;
234 /* The top 16 bits are used to identify the datapath. The lower 48 bits
235 * use an interface address. */
236 id = (uint64_t)dp_idx << 48;
237 if ((dev = dev_get_by_name(&init_net, "ctl0"))
238 || (dev = dev_get_by_name(&init_net, "eth0"))) {
239 for (i=0; i<ETH_ALEN; i++) {
240 id |= (uint64_t)dev->dev_addr[i] << (8*(ETH_ALEN-1 - i));
244 /* Randomly choose the lower 48 bits if we cannot find an
245 * address and mark the most significant bit to indicate that
246 * this was randomly generated. */
247 uint8_t rand[ETH_ALEN];
248 get_random_bytes(rand, ETH_ALEN);
249 id |= (uint64_t)1 << 63;
250 for (i=0; i<ETH_ALEN; i++) {
251 id |= (uint64_t)rand[i] << (8*(ETH_ALEN-1 - i));
258 /* Creates a new datapath numbered 'dp_idx'. Returns 0 for success or a
259 * negative error code. */
260 static int new_dp(int dp_idx)
265 if (dp_idx < 0 || dp_idx >= DP_MAX)
268 if (!try_module_get(THIS_MODULE))
271 /* Exit early if a datapath with that number already exists. */
278 dp = kzalloc(sizeof *dp, GFP_KERNEL);
282 /* Setup our "of" device */
283 err = dp_dev_setup(dp);
288 dp->id = gen_datapath_id(dp_idx);
289 dp->chain = chain_create(dp);
290 if (dp->chain == NULL)
291 goto err_destroy_dp_dev;
292 INIT_LIST_HEAD(&dp->port_list);
294 dp->local_port = new_nbp(dp, dp->netdev, OFPP_LOCAL);
295 if (IS_ERR(dp->local_port)) {
296 err = PTR_ERR(dp->local_port);
297 goto err_destroy_local_port;
301 dp->miss_send_len = OFP_DEFAULT_MISS_SEND_LEN;
303 dp->dp_task = kthread_run(dp_maint_func, dp, "dp%d", dp_idx);
304 if (IS_ERR(dp->dp_task))
305 goto err_destroy_chain;
311 err_destroy_local_port:
312 dp_del_switch_port(dp->local_port);
314 chain_destroy(dp->chain);
320 module_put(THIS_MODULE);
324 /* Find and return a free port number under 'dp'. */
325 static int find_portno(struct datapath *dp)
328 for (i = 0; i < DP_MAX_PORTS; i++)
329 if (dp->ports[i] == NULL)
334 static struct net_bridge_port *new_nbp(struct datapath *dp,
335 struct net_device *dev, int port_no)
337 struct net_bridge_port *p;
339 if (dev->br_port != NULL)
340 return ERR_PTR(-EBUSY);
342 p = kzalloc(sizeof(*p), GFP_KERNEL);
344 return ERR_PTR(-ENOMEM);
347 dev_set_promiscuity(dev, 1);
352 p->port_no = port_no;
353 spin_lock_init(&p->lock);
354 INIT_WORK(&p->port_task, NULL);
355 if (port_no != OFPP_LOCAL)
356 rcu_assign_pointer(dev->br_port, p);
357 if (port_no < DP_MAX_PORTS)
358 rcu_assign_pointer(dp->ports[port_no], p);
359 list_add_rcu(&p->node, &dp->port_list);
364 int add_switch_port(struct datapath *dp, struct net_device *dev)
366 struct net_bridge_port *p;
369 if (dev->flags & IFF_LOOPBACK || dev->type != ARPHRD_ETHER
373 port_no = find_portno(dp);
377 p = new_nbp(dp, dev, port_no);
383 /* Notify the ctlpath that this port has been added */
384 dp_send_port_status(p, OFPPR_ADD);
389 /* Delete 'p' from switch. */
390 int dp_del_switch_port(struct net_bridge_port *p)
396 /* First drop references to device. */
397 cancel_work_sync(&p->port_task);
399 dev_set_promiscuity(p->dev, -1);
401 list_del_rcu(&p->node);
402 if (p->port_no != OFPP_LOCAL)
403 rcu_assign_pointer(p->dp->ports[p->port_no], NULL);
404 rcu_assign_pointer(p->dev->br_port, NULL);
406 /* Then wait until no one is still using it, and destroy it. */
410 /* Free any SNAT configuration on the port. */
411 spin_lock_irqsave(&p->lock, flags);
413 spin_unlock_irqrestore(&p->lock, flags);
416 /* Notify the ctlpath that this port no longer exists */
417 dp_send_port_status(p, OFPPR_DELETE);
425 static void del_dp(struct datapath *dp)
427 struct net_bridge_port *p, *n;
429 kthread_stop(dp->dp_task);
431 /* Drop references to DP. */
432 list_for_each_entry_safe (p, n, &dp->port_list, node)
433 dp_del_switch_port(p);
434 rcu_assign_pointer(dps[dp->dp_idx], NULL);
436 /* Kill off local_port dev references from buffered packets that have
437 * associated dst entries. */
441 /* Destroy dp->netdev. (Must follow deleting switch ports since
442 * dp->local_port has a reference to it.) */
445 /* Wait until no longer in use, then destroy it. */
447 chain_destroy(dp->chain);
449 module_put(THIS_MODULE);
452 static int dp_maint_func(void *data)
454 struct datapath *dp = (struct datapath *) data;
456 while (!kthread_should_stop()) {
458 struct net_bridge_port *p;
460 /* Expire old SNAT entries */
462 list_for_each_entry_rcu (p, &dp->port_list, node)
467 /* Timeout old entries */
468 chain_timeout(dp->chain);
469 msleep_interruptible(MAINT_SLEEP_MSECS);
476 do_port_input(struct net_bridge_port *p, struct sk_buff *skb)
479 /* Check if this packet needs early SNAT processing. */
480 if (snat_pre_route(skb)) {
486 /* Push the Ethernet header back on. */
487 skb_push(skb, ETH_HLEN);
488 fwd_port_input(p->dp->chain, skb, p);
492 * Used as br_handle_frame_hook. (Cannot run bridge at the same time, even on
493 * different set of devices!)
495 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,22)
496 /* Called with rcu_read_lock. */
497 static struct sk_buff *dp_frame_hook(struct net_bridge_port *p,
500 do_port_input(p, skb);
503 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,0)
504 static int dp_frame_hook(struct net_bridge_port *p, struct sk_buff **pskb)
506 do_port_input(p, *pskb);
510 /* NB: This has only been tested on 2.4.35 */
511 static void dp_frame_hook(struct sk_buff *skb)
513 struct net_bridge_port *p = skb->dev->br_port;
516 do_port_input(p, skb);
523 /* Forwarding output path.
524 * Based on net/bridge/br_forward.c. */
526 static inline unsigned packet_length(const struct sk_buff *skb)
528 int length = skb->len - ETH_HLEN;
529 if (skb->protocol == htons(ETH_P_8021Q))
534 /* Send packets out all the ports except the originating one. If the
535 * "flood" argument is set, only send along the minimum spanning tree.
538 output_all(struct datapath *dp, struct sk_buff *skb, int flood)
540 u32 disable = flood ? OFPPC_NO_FLOOD : 0;
541 struct net_bridge_port *p;
544 list_for_each_entry_rcu (p, &dp->port_list, node) {
545 if (skb->dev == p->dev || p->config & disable)
547 if (prev_port != -1) {
548 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
553 dp_output_port(dp, clone, prev_port, 0);
555 prev_port = p->port_no;
558 dp_output_port(dp, skb, prev_port, 0);
565 /* Marks 'skb' as having originated from 'in_port' in 'dp'.
566 FIXME: how are devices reference counted? */
567 void dp_set_origin(struct datapath *dp, uint16_t in_port,
570 struct net_bridge_port *p;
571 p = (in_port < DP_MAX_PORTS ? dp->ports[in_port]
572 : in_port == OFPP_LOCAL ? dp->local_port
581 dp_xmit_skb(struct sk_buff *skb)
584 if (packet_length(skb) > skb->dev->mtu) {
585 printk("dropped over-mtu packet: %d > %d\n",
586 packet_length(skb), skb->dev->mtu);
596 /* Takes ownership of 'skb' and transmits it to 'out_port' on 'dp'.
598 int dp_output_port(struct datapath *dp, struct sk_buff *skb, int out_port,
604 /* Send it out the port it came in on, which is already set in
608 printk("skb device not set forwarding to in_port\n");
612 return dp_xmit_skb(skb);
615 int retval = run_flow_through_tables(dp->chain, skb,
623 return output_all(dp, skb, 1);
626 return output_all(dp, skb, 0);
628 case OFPP_CONTROLLER:
629 return dp_output_control(dp, skb, fwd_save_skb(skb), 0,
633 struct net_device *dev = dp->netdev;
634 return dev ? dp_dev_recv(dev, skb) : -ESRCH;
637 case 0 ... DP_MAX_PORTS - 1: {
638 struct net_bridge_port *p = dp->ports[out_port];
641 if (p->dev == skb->dev) {
642 /* To send to the input port, must use OFPP_IN_PORT */
645 printk("can't directly forward to input port\n");
648 if (p->config & OFPPC_NO_FWD && !ignore_no_fwd) {
653 return dp_xmit_skb(skb);
663 printk("can't forward to bad port %d\n", out_port);
667 /* Takes ownership of 'skb' and transmits it to 'dp''s control path. If
668 * 'buffer_id' != -1, then only the first 64 bytes of 'skb' are sent;
669 * otherwise, all of 'skb' is sent. 'reason' indicates why 'skb' is being
670 * sent. 'max_len' sets the maximum number of bytes that the caller
671 * wants to be sent; a value of 0 indicates the entire packet should be
674 dp_output_control(struct datapath *dp, struct sk_buff *skb,
675 uint32_t buffer_id, size_t max_len, int reason)
677 /* FIXME? Can we avoid creating a new skbuff in the case where we
678 * forward the whole packet? */
679 struct sk_buff *f_skb;
680 struct ofp_packet_in *opi;
681 struct net_bridge_port *p;
682 size_t fwd_len, opi_len;
686 if ((buffer_id != (uint32_t) -1) && max_len)
687 fwd_len = min(fwd_len, max_len);
689 opi_len = offsetof(struct ofp_packet_in, data) + fwd_len;
690 opi = alloc_openflow_skb(dp, opi_len, OFPT_PACKET_IN, NULL, &f_skb);
695 opi->buffer_id = htonl(buffer_id);
696 opi->total_len = htons(skb->len);
697 p = skb->dev->br_port;
698 opi->in_port = htons(p ? p->port_no : OFPP_LOCAL);
699 opi->reason = reason;
701 memcpy(opi->data, skb_mac_header(skb), fwd_len);
702 err = send_openflow_skb(f_skb, NULL);
709 static void fill_port_desc(struct net_bridge_port *p, struct ofp_phy_port *desc)
712 desc->port_no = htons(p->port_no);
713 strncpy(desc->name, p->dev->name, OFP_MAX_PORT_NAME_LEN);
714 desc->name[OFP_MAX_PORT_NAME_LEN-1] = '\0';
715 memcpy(desc->hw_addr, p->dev->dev_addr, ETH_ALEN);
718 desc->advertised = 0;
721 spin_lock_irqsave(&p->lock, flags);
722 desc->config = htonl(p->config);
723 desc->state = htonl(p->state);
724 spin_unlock_irqrestore(&p->lock, flags);
726 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,24)
727 if (p->dev->ethtool_ops && p->dev->ethtool_ops->get_settings) {
728 struct ethtool_cmd ecmd = { .cmd = ETHTOOL_GSET };
730 if (!p->dev->ethtool_ops->get_settings(p->dev, &ecmd)) {
731 /* Set the supported features */
732 if (ecmd.supported & SUPPORTED_10baseT_Half)
733 desc->supported |= OFPPF_10MB_HD;
734 if (ecmd.supported & SUPPORTED_10baseT_Full)
735 desc->supported |= OFPPF_10MB_FD;
736 if (ecmd.supported & SUPPORTED_100baseT_Half)
737 desc->supported |= OFPPF_100MB_HD;
738 if (ecmd.supported & SUPPORTED_100baseT_Full)
739 desc->supported |= OFPPF_100MB_FD;
740 if (ecmd.supported & SUPPORTED_1000baseT_Half)
741 desc->supported |= OFPPF_1GB_HD;
742 if (ecmd.supported & SUPPORTED_1000baseT_Full)
743 desc->supported |= OFPPF_1GB_FD;
744 if (ecmd.supported & SUPPORTED_10000baseT_Full)
745 desc->supported |= OFPPF_10GB_FD;
746 if (ecmd.supported & SUPPORTED_TP)
747 desc->supported |= OFPPF_COPPER;
748 if (ecmd.supported & SUPPORTED_FIBRE)
749 desc->supported |= OFPPF_FIBER;
750 if (ecmd.supported & SUPPORTED_Autoneg)
751 desc->supported |= OFPPF_AUTONEG;
752 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
753 if (ecmd.supported & SUPPORTED_Pause)
754 desc->supported |= OFPPF_PAUSE;
755 if (ecmd.supported & SUPPORTED_Asym_Pause)
756 desc->supported |= OFPPF_PAUSE_ASYM;
757 #endif /* kernel >= 2.6.14 */
759 /* Set the advertised features */
760 if (ecmd.advertising & ADVERTISED_10baseT_Half)
761 desc->advertised |= OFPPF_10MB_HD;
762 if (ecmd.advertising & ADVERTISED_10baseT_Full)
763 desc->advertised |= OFPPF_10MB_FD;
764 if (ecmd.advertising & ADVERTISED_100baseT_Half)
765 desc->advertised |= OFPPF_100MB_HD;
766 if (ecmd.advertising & ADVERTISED_100baseT_Full)
767 desc->advertised |= OFPPF_100MB_FD;
768 if (ecmd.advertising & ADVERTISED_1000baseT_Half)
769 desc->advertised |= OFPPF_1GB_HD;
770 if (ecmd.advertising & ADVERTISED_1000baseT_Full)
771 desc->advertised |= OFPPF_1GB_FD;
772 if (ecmd.advertising & ADVERTISED_10000baseT_Full)
773 desc->advertised |= OFPPF_10GB_FD;
774 if (ecmd.advertising & ADVERTISED_TP)
775 desc->advertised |= OFPPF_COPPER;
776 if (ecmd.advertising & ADVERTISED_FIBRE)
777 desc->advertised |= OFPPF_FIBER;
778 if (ecmd.advertising & ADVERTISED_Autoneg)
779 desc->advertised |= OFPPF_AUTONEG;
780 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,14)
781 if (ecmd.advertising & ADVERTISED_Pause)
782 desc->advertised |= OFPPF_PAUSE;
783 if (ecmd.advertising & ADVERTISED_Asym_Pause)
784 desc->advertised |= OFPPF_PAUSE_ASYM;
785 #endif /* kernel >= 2.6.14 */
787 /* Set the current features */
788 if (ecmd.speed == SPEED_10)
789 desc->curr = (ecmd.duplex) ? OFPPF_10MB_FD : OFPPF_10MB_HD;
790 else if (ecmd.speed == SPEED_100)
791 desc->curr = (ecmd.duplex) ? OFPPF_100MB_FD : OFPPF_100MB_HD;
792 else if (ecmd.speed == SPEED_1000)
793 desc->curr = (ecmd.duplex) ? OFPPF_1GB_FD : OFPPF_1GB_HD;
794 else if (ecmd.speed == SPEED_10000)
795 desc->curr = OFPPF_10GB_FD;
797 if (ecmd.port == PORT_TP)
798 desc->curr |= OFPPF_COPPER;
799 else if (ecmd.port == PORT_FIBRE)
800 desc->curr |= OFPPF_FIBER;
803 desc->curr |= OFPPF_AUTONEG;
807 desc->curr = htonl(desc->curr);
808 desc->supported = htonl(desc->supported);
809 desc->advertised = htonl(desc->advertised);
810 desc->peer = htonl(desc->peer);
814 fill_features_reply(struct datapath *dp, struct ofp_switch_features *ofr)
816 struct net_bridge_port *p;
819 ofr->datapath_id = cpu_to_be64(dp->id);
821 ofr->n_buffers = htonl(N_PKT_BUFFERS);
822 ofr->n_tables = dp->chain->n_tables;
823 ofr->capabilities = htonl(OFP_SUPPORTED_CAPABILITIES);
824 ofr->actions = htonl(OFP_SUPPORTED_ACTIONS);
825 memset(ofr->pad, 0, sizeof ofr->pad);
827 list_for_each_entry_rcu (p, &dp->port_list, node) {
828 fill_port_desc(p, &ofr->ports[port_count]);
836 dp_send_features_reply(struct datapath *dp, const struct sender *sender)
839 struct ofp_switch_features *ofr;
840 size_t ofr_len, port_max_len;
844 port_max_len = sizeof(struct ofp_phy_port) * DP_MAX_PORTS;
845 ofr = alloc_openflow_skb(dp, sizeof(*ofr) + port_max_len,
846 OFPT_FEATURES_REPLY, sender, &skb);
851 port_count = fill_features_reply(dp, ofr);
854 ofr_len = sizeof(*ofr) + (sizeof(struct ofp_phy_port) * port_count);
855 resize_openflow_skb(skb, &ofr->header, ofr_len);
856 return send_openflow_skb(skb, sender);
860 dp_send_config_reply(struct datapath *dp, const struct sender *sender)
863 struct ofp_switch_config *osc;
865 osc = alloc_openflow_skb(dp, sizeof *osc, OFPT_GET_CONFIG_REPLY, sender,
870 osc->flags = htons(dp->flags);
871 osc->miss_send_len = htons(dp->miss_send_len);
873 return send_openflow_skb(skb, sender);
877 dp_send_hello(struct datapath *dp, const struct sender *sender,
878 const struct ofp_header *request)
880 if (request->version < OFP_VERSION) {
882 sprintf(err, "Only version 0x%02x supported", OFP_VERSION);
883 dp_send_error_msg(dp, sender, OFPET_HELLO_FAILED,
884 OFPHFC_INCOMPATIBLE, err, strlen(err));
888 struct ofp_header *reply;
890 reply = alloc_openflow_skb(dp, sizeof *reply,
891 OFPT_HELLO, sender, &skb);
895 return send_openflow_skb(skb, sender);
899 /* Callback function for a workqueue to disable an interface */
901 down_port_cb(struct work_struct *work)
903 struct net_bridge_port *p = container_of(work, struct net_bridge_port,
907 if (dev_change_flags(p->dev, p->dev->flags & ~IFF_UP) < 0)
909 printk("problem bringing up port %s\n", p->dev->name);
911 p->config |= OFPPC_PORT_DOWN;
914 /* Callback function for a workqueue to enable an interface */
916 up_port_cb(struct work_struct *work)
918 struct net_bridge_port *p = container_of(work, struct net_bridge_port,
922 if (dev_change_flags(p->dev, p->dev->flags | IFF_UP) < 0)
924 printk("problem bringing down port %s\n", p->dev->name);
926 p->config &= ~OFPPC_PORT_DOWN;
930 dp_update_port_flags(struct datapath *dp, const struct ofp_port_mod *opm)
932 unsigned long int flags;
933 int port_no = ntohs(opm->port_no);
934 struct net_bridge_port *p;
935 p = (port_no < DP_MAX_PORTS ? dp->ports[port_no]
936 : port_no == OFPP_LOCAL ? dp->local_port
939 /* Make sure the port id hasn't changed since this was sent */
940 if (!p || memcmp(opm->hw_addr, p->dev->dev_addr, ETH_ALEN))
943 spin_lock_irqsave(&p->lock, flags);
945 uint32_t config_mask = ntohl(opm->mask);
946 p->config &= ~config_mask;
947 p->config |= ntohl(opm->config) & config_mask;
950 /* Modifying the status of an interface requires taking a lock
951 * that cannot be done from here. For this reason, we use a shared
952 * workqueue, which will cause it to be executed from a safer
954 if (opm->mask & htonl(OFPPC_PORT_DOWN)) {
955 if ((opm->config & htonl(OFPPC_PORT_DOWN))
956 && (p->config & OFPPC_PORT_DOWN) == 0) {
957 PREPARE_WORK(&p->port_task, down_port_cb);
958 schedule_work(&p->port_task);
959 } else if ((opm->config & htonl(OFPPC_PORT_DOWN)) == 0
960 && (p->config & OFPPC_PORT_DOWN)) {
961 PREPARE_WORK(&p->port_task, up_port_cb);
962 schedule_work(&p->port_task);
965 spin_unlock_irqrestore(&p->lock, flags);
970 /* Initialize the port status field of the bridge port. */
972 init_port_status(struct net_bridge_port *p)
974 unsigned long int flags;
976 spin_lock_irqsave(&p->lock, flags);
978 if (p->dev->flags & IFF_UP)
979 p->config &= ~OFPPC_PORT_DOWN;
981 p->config |= OFPPC_PORT_DOWN;
983 if (netif_carrier_ok(p->dev))
984 p->state &= ~OFPPS_LINK_DOWN;
986 p->state |= OFPPS_LINK_DOWN;
988 spin_unlock_irqrestore(&p->lock, flags);
992 dp_send_port_status(struct net_bridge_port *p, uint8_t status)
995 struct ofp_port_status *ops;
997 ops = alloc_openflow_skb(p->dp, sizeof *ops, OFPT_PORT_STATUS, NULL,
1001 ops->reason = status;
1002 memset(ops->pad, 0, sizeof ops->pad);
1003 fill_port_desc(p, &ops->desc);
1005 return send_openflow_skb(skb, NULL);
1009 dp_send_flow_expired(struct datapath *dp, struct sw_flow *flow,
1010 enum ofp_flow_expired_reason reason)
1012 struct sk_buff *skb;
1013 struct ofp_flow_expired *ofe;
1015 if (!(dp->flags & OFPC_SEND_FLOW_EXP))
1018 ofe = alloc_openflow_skb(dp, sizeof *ofe, OFPT_FLOW_EXPIRED, 0, &skb);
1022 flow_fill_match(&ofe->match, &flow->key);
1024 ofe->priority = htons(flow->priority);
1025 ofe->reason = reason;
1026 memset(ofe->pad, 0, sizeof ofe->pad);
1028 ofe->duration = htonl((jiffies - flow->init_time) / HZ);
1029 memset(ofe->pad2, 0, sizeof ofe->pad2);
1030 ofe->packet_count = cpu_to_be64(flow->packet_count);
1031 ofe->byte_count = cpu_to_be64(flow->byte_count);
1033 return send_openflow_skb(skb, NULL);
1035 EXPORT_SYMBOL(dp_send_flow_expired);
1038 dp_send_error_msg(struct datapath *dp, const struct sender *sender,
1039 uint16_t type, uint16_t code, const void *data, size_t len)
1041 struct sk_buff *skb;
1042 struct ofp_error_msg *oem;
1045 oem = alloc_openflow_skb(dp, sizeof(*oem)+len, OFPT_ERROR,
1050 oem->type = htons(type);
1051 oem->code = htons(code);
1052 memcpy(oem->data, data, len);
1054 return send_openflow_skb(skb, sender);
1058 dp_send_echo_reply(struct datapath *dp, const struct sender *sender,
1059 const struct ofp_header *rq)
1061 struct sk_buff *skb;
1062 struct ofp_header *reply;
1064 reply = alloc_openflow_skb(dp, ntohs(rq->length), OFPT_ECHO_REPLY,
1069 memcpy(reply + 1, rq + 1, ntohs(rq->length) - sizeof *rq);
1070 return send_openflow_skb(skb, sender);
1073 /* Generic Netlink interface.
1075 * See netlink(7) for an introduction to netlink. See
1076 * http://linux-net.osdl.org/index.php/Netlink for more information and
1077 * pointers on how to work with netlink and Generic Netlink in the kernel and
1080 static struct genl_family dp_genl_family = {
1081 .id = GENL_ID_GENERATE,
1083 .name = DP_GENL_FAMILY_NAME,
1085 .maxattr = DP_GENL_A_MAX,
1088 /* Attribute policy: what each attribute may contain. */
1089 static struct nla_policy dp_genl_policy[DP_GENL_A_MAX + 1] = {
1090 [DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
1091 [DP_GENL_A_MC_GROUP] = { .type = NLA_U32 },
1092 [DP_GENL_A_PORTNAME] = { .type = NLA_STRING }
1095 static int dp_genl_add(struct sk_buff *skb, struct genl_info *info)
1097 if (!info->attrs[DP_GENL_A_DP_IDX])
1100 return new_dp(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
1103 static struct genl_ops dp_genl_ops_add_dp = {
1104 .cmd = DP_GENL_C_ADD_DP,
1105 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1106 .policy = dp_genl_policy,
1107 .doit = dp_genl_add,
1111 struct datapath *dp_get(int dp_idx)
1113 if (dp_idx < 0 || dp_idx > DP_MAX)
1115 return rcu_dereference(dps[dp_idx]);
1118 static int dp_genl_del(struct sk_buff *skb, struct genl_info *info)
1120 struct datapath *dp;
1123 if (!info->attrs[DP_GENL_A_DP_IDX])
1126 dp = dp_get(nla_get_u32((info->attrs[DP_GENL_A_DP_IDX])));
1136 static struct genl_ops dp_genl_ops_del_dp = {
1137 .cmd = DP_GENL_C_DEL_DP,
1138 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1139 .policy = dp_genl_policy,
1140 .doit = dp_genl_del,
1144 /* Queries a datapath for related information. Currently the only relevant
1145 * information is the datapath's multicast group ID. Really we want one
1146 * multicast group per datapath, but because of locking issues[*] we can't
1147 * easily get one. Thus, every datapath will currently return the same
1148 * global multicast group ID, but in the future it would be nice to fix that.
1150 * [*] dp_genl_add, to add a new datapath, is called under the genl_lock
1151 * mutex, and genl_register_mc_group, called to acquire a new multicast
1152 * group ID, also acquires genl_lock, thus deadlock.
1154 static int dp_genl_query(struct sk_buff *skb, struct genl_info *info)
1156 struct datapath *dp;
1157 struct sk_buff *ans_skb = NULL;
1161 if (!info->attrs[DP_GENL_A_DP_IDX])
1165 dp_idx = nla_get_u32((info->attrs[DP_GENL_A_DP_IDX]));
1166 dp = dp_get(dp_idx);
1171 ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
1176 data = genlmsg_put_reply(ans_skb, info, &dp_genl_family,
1177 0, DP_GENL_C_QUERY_DP);
1182 NLA_PUT_U32(ans_skb, DP_GENL_A_DP_IDX, dp_idx);
1183 NLA_PUT_U32(ans_skb, DP_GENL_A_MC_GROUP, mc_group.id);
1185 genlmsg_end(ans_skb, data);
1186 err = genlmsg_reply(ans_skb, info);
1198 static struct genl_ops dp_genl_ops_query_dp = {
1199 .cmd = DP_GENL_C_QUERY_DP,
1200 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1201 .policy = dp_genl_policy,
1202 .doit = dp_genl_query,
1206 static int dp_genl_add_del_port(struct sk_buff *skb, struct genl_info *info)
1208 struct datapath *dp;
1209 struct net_device *port;
1212 if (!info->attrs[DP_GENL_A_DP_IDX] || !info->attrs[DP_GENL_A_PORTNAME])
1216 dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
1222 /* Get interface to add/remove. */
1223 port = dev_get_by_name(&init_net,
1224 nla_data(info->attrs[DP_GENL_A_PORTNAME]));
1230 /* Execute operation. */
1231 if (info->genlhdr->cmd == DP_GENL_C_ADD_PORT)
1232 err = add_switch_port(dp, port);
1234 if (port->br_port == NULL || port->br_port->dp != dp) {
1238 err = dp_del_switch_port(port->br_port);
1247 static struct genl_ops dp_genl_ops_add_port = {
1248 .cmd = DP_GENL_C_ADD_PORT,
1249 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1250 .policy = dp_genl_policy,
1251 .doit = dp_genl_add_del_port,
1255 static struct genl_ops dp_genl_ops_del_port = {
1256 .cmd = DP_GENL_C_DEL_PORT,
1257 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1258 .policy = dp_genl_policy,
1259 .doit = dp_genl_add_del_port,
1263 static int dp_genl_openflow(struct sk_buff *skb, struct genl_info *info)
1265 struct nlattr *va = info->attrs[DP_GENL_A_OPENFLOW];
1266 struct datapath *dp;
1267 struct ofp_header *oh;
1268 struct sender sender;
1271 if (!info->attrs[DP_GENL_A_DP_IDX] || !va)
1274 dp = dp_get(nla_get_u32(info->attrs[DP_GENL_A_DP_IDX]));
1278 if (nla_len(va) < sizeof(struct ofp_header))
1282 sender.xid = oh->xid;
1283 sender.pid = info->snd_pid;
1284 sender.seq = info->snd_seq;
1286 mutex_lock(&dp_mutex);
1287 err = fwd_control_input(dp->chain, &sender,
1288 nla_data(va), nla_len(va));
1289 mutex_unlock(&dp_mutex);
1293 static struct nla_policy dp_genl_openflow_policy[DP_GENL_A_MAX + 1] = {
1294 [DP_GENL_A_DP_IDX] = { .type = NLA_U32 },
1297 static int desc_stats_dump(struct datapath *dp, void *state,
1298 void *body, int *body_len)
1300 struct ofp_desc_stats *ods = body;
1301 int n_bytes = sizeof *ods;
1303 if (n_bytes > *body_len) {
1306 *body_len = n_bytes;
1308 strncpy(ods->mfr_desc, mfr_desc, sizeof ods->mfr_desc);
1309 strncpy(ods->hw_desc, hw_desc, sizeof ods->hw_desc);
1310 strncpy(ods->sw_desc, sw_desc, sizeof ods->sw_desc);
1311 strncpy(ods->serial_num, serial_num, sizeof ods->serial_num);
1316 struct flow_stats_state {
1318 struct sw_table_position position;
1319 const struct ofp_flow_stats_request *rq;
1322 int bytes_used, bytes_allocated;
1325 static int flow_stats_init(struct datapath *dp, const void *body, int body_len,
1328 const struct ofp_flow_stats_request *fsr = body;
1329 struct flow_stats_state *s = kmalloc(sizeof *s, GFP_ATOMIC);
1332 s->table_idx = fsr->table_id == 0xff ? 0 : fsr->table_id;
1333 memset(&s->position, 0, sizeof s->position);
1339 static int flow_stats_dump_callback(struct sw_flow *flow, void *private)
1341 struct sw_flow_actions *sf_acts = rcu_dereference(flow->sf_acts);
1342 struct flow_stats_state *s = private;
1343 struct ofp_flow_stats *ofs;
1346 length = sizeof *ofs + sf_acts->actions_len;
1347 if (length + s->bytes_used > s->bytes_allocated)
1350 ofs = s->body + s->bytes_used;
1351 ofs->length = htons(length);
1352 ofs->table_id = s->table_idx;
1354 ofs->match.wildcards = htonl(flow->key.wildcards);
1355 ofs->match.in_port = flow->key.in_port;
1356 memcpy(ofs->match.dl_src, flow->key.dl_src, ETH_ALEN);
1357 memcpy(ofs->match.dl_dst, flow->key.dl_dst, ETH_ALEN);
1358 ofs->match.dl_vlan = flow->key.dl_vlan;
1359 ofs->match.dl_type = flow->key.dl_type;
1360 ofs->match.nw_src = flow->key.nw_src;
1361 ofs->match.nw_dst = flow->key.nw_dst;
1362 ofs->match.nw_proto = flow->key.nw_proto;
1364 ofs->match.tp_src = flow->key.tp_src;
1365 ofs->match.tp_dst = flow->key.tp_dst;
1366 ofs->duration = htonl((jiffies - flow->init_time) / HZ);
1367 ofs->priority = htons(flow->priority);
1368 ofs->idle_timeout = htons(flow->idle_timeout);
1369 ofs->hard_timeout = htons(flow->hard_timeout);
1370 memset(ofs->pad2, 0, sizeof ofs->pad2);
1371 ofs->packet_count = cpu_to_be64(flow->packet_count);
1372 ofs->byte_count = cpu_to_be64(flow->byte_count);
1373 memcpy(ofs->actions, sf_acts->actions, sf_acts->actions_len);
1375 s->bytes_used += length;
1379 static int flow_stats_dump(struct datapath *dp, void *state,
1380 void *body, int *body_len)
1382 struct flow_stats_state *s = state;
1383 struct sw_flow_key match_key;
1387 s->bytes_allocated = *body_len;
1390 flow_extract_match(&match_key, &s->rq->match);
1391 while (s->table_idx < dp->chain->n_tables
1392 && (s->rq->table_id == 0xff || s->rq->table_id == s->table_idx))
1394 struct sw_table *table = dp->chain->tables[s->table_idx];
1396 error = table->iterate(table, &match_key, &s->position,
1397 flow_stats_dump_callback, s);
1402 memset(&s->position, 0, sizeof s->position);
1404 *body_len = s->bytes_used;
1406 /* If error is 0, we're done.
1407 * Otherwise, if some bytes were used, there are more flows to come.
1408 * Otherwise, we were not able to fit even a single flow in the body,
1409 * which indicates that we have a single flow with too many actions to
1410 * fit. We won't ever make any progress at that rate, so give up. */
1411 return !error ? 0 : s->bytes_used ? 1 : -ENOMEM;
1414 static void flow_stats_done(void *state)
1419 static int aggregate_stats_init(struct datapath *dp,
1420 const void *body, int body_len,
1423 *state = (void *)body;
1427 static int aggregate_stats_dump_callback(struct sw_flow *flow, void *private)
1429 struct ofp_aggregate_stats_reply *rpy = private;
1430 rpy->packet_count += flow->packet_count;
1431 rpy->byte_count += flow->byte_count;
1436 static int aggregate_stats_dump(struct datapath *dp, void *state,
1437 void *body, int *body_len)
1439 struct ofp_aggregate_stats_request *rq = state;
1440 struct ofp_aggregate_stats_reply *rpy;
1441 struct sw_table_position position;
1442 struct sw_flow_key match_key;
1445 if (*body_len < sizeof *rpy)
1448 *body_len = sizeof *rpy;
1450 memset(rpy, 0, sizeof *rpy);
1452 flow_extract_match(&match_key, &rq->match);
1453 table_idx = rq->table_id == 0xff ? 0 : rq->table_id;
1454 memset(&position, 0, sizeof position);
1455 while (table_idx < dp->chain->n_tables
1456 && (rq->table_id == 0xff || rq->table_id == table_idx))
1458 struct sw_table *table = dp->chain->tables[table_idx];
1461 error = table->iterate(table, &match_key, &position,
1462 aggregate_stats_dump_callback, rpy);
1467 memset(&position, 0, sizeof position);
1470 rpy->packet_count = cpu_to_be64(rpy->packet_count);
1471 rpy->byte_count = cpu_to_be64(rpy->byte_count);
1472 rpy->flow_count = htonl(rpy->flow_count);
1476 static int table_stats_dump(struct datapath *dp, void *state,
1477 void *body, int *body_len)
1479 struct ofp_table_stats *ots;
1480 int n_bytes = dp->chain->n_tables * sizeof *ots;
1482 if (n_bytes > *body_len)
1484 *body_len = n_bytes;
1485 for (i = 0, ots = body; i < dp->chain->n_tables; i++, ots++) {
1486 struct sw_table_stats stats;
1487 dp->chain->tables[i]->stats(dp->chain->tables[i], &stats);
1488 strncpy(ots->name, stats.name, sizeof ots->name);
1490 ots->wildcards = htonl(stats.wildcards);
1491 memset(ots->pad, 0, sizeof ots->pad);
1492 ots->max_entries = htonl(stats.max_flows);
1493 ots->active_count = htonl(stats.n_flows);
1494 ots->lookup_count = cpu_to_be64(stats.n_lookup);
1495 ots->matched_count = cpu_to_be64(stats.n_matched);
1500 struct port_stats_state {
1504 static int port_stats_init(struct datapath *dp, const void *body, int body_len,
1507 struct port_stats_state *s = kmalloc(sizeof *s, GFP_ATOMIC);
1515 static int port_stats_dump(struct datapath *dp, void *state,
1516 void *body, int *body_len)
1518 struct port_stats_state *s = state;
1519 struct ofp_port_stats *ops;
1520 int n_ports, max_ports;
1523 max_ports = *body_len / sizeof *ops;
1529 for (i = s->port; i < DP_MAX_PORTS && n_ports < max_ports; i++) {
1530 struct net_bridge_port *p = dp->ports[i];
1531 struct net_device_stats *stats;
1534 stats = p->dev->get_stats(p->dev);
1535 ops->port_no = htons(p->port_no);
1536 memset(ops->pad, 0, sizeof ops->pad);
1537 ops->rx_packets = cpu_to_be64(stats->rx_packets);
1538 ops->tx_packets = cpu_to_be64(stats->tx_packets);
1539 ops->rx_bytes = cpu_to_be64(stats->rx_bytes);
1540 ops->tx_bytes = cpu_to_be64(stats->tx_bytes);
1541 ops->rx_dropped = cpu_to_be64(stats->rx_dropped);
1542 ops->tx_dropped = cpu_to_be64(stats->tx_dropped);
1543 ops->rx_errors = cpu_to_be64(stats->rx_errors);
1544 ops->tx_errors = cpu_to_be64(stats->tx_errors);
1545 ops->rx_frame_err = cpu_to_be64(stats->rx_frame_errors);
1546 ops->rx_over_err = cpu_to_be64(stats->rx_over_errors);
1547 ops->rx_crc_err = cpu_to_be64(stats->rx_crc_errors);
1548 ops->collisions = cpu_to_be64(stats->collisions);
1553 *body_len = n_ports * sizeof *ops;
1554 return n_ports >= max_ports;
1557 static void port_stats_done(void *state)
1563 /* Minimum and maximum acceptable number of bytes in body member of
1564 * struct ofp_stats_request. */
1565 size_t min_body, max_body;
1567 /* Prepares to dump some kind of statistics on 'dp'. 'body' and
1568 * 'body_len' are the 'body' member of the struct ofp_stats_request.
1569 * Returns zero if successful, otherwise a negative error code.
1570 * May initialize '*state' to state information. May be null if no
1571 * initialization is required.*/
1572 int (*init)(struct datapath *dp, const void *body, int body_len,
1575 /* Dumps statistics for 'dp' into the '*body_len' bytes at 'body', and
1576 * modifies '*body_len' to reflect the number of bytes actually used.
1577 * ('body' will be transmitted as the 'body' member of struct
1578 * ofp_stats_reply.) */
1579 int (*dump)(struct datapath *dp, void *state,
1580 void *body, int *body_len);
1582 /* Cleans any state created by the init or dump functions. May be null
1583 * if no cleanup is required. */
1584 void (*done)(void *state);
1587 static const struct stats_type stats[] = {
1596 sizeof(struct ofp_flow_stats_request),
1597 sizeof(struct ofp_flow_stats_request),
1602 [OFPST_AGGREGATE] = {
1603 sizeof(struct ofp_aggregate_stats_request),
1604 sizeof(struct ofp_aggregate_stats_request),
1605 aggregate_stats_init,
1606 aggregate_stats_dump,
1626 dp_genl_openflow_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
1628 struct datapath *dp;
1629 struct sender sender;
1630 const struct stats_type *s;
1631 struct ofp_stats_reply *osr;
1633 int max_openflow_len, body_len;
1637 /* Set up the cleanup function for this dump. Linux 2.6.20 and later
1638 * support setting up cleanup functions via the .doneit member of
1639 * struct genl_ops. This kluge supports earlier versions also. */
1640 cb->done = dp_genl_openflow_done;
1642 sender.pid = NETLINK_CB(cb->skb).pid;
1643 sender.seq = cb->nlh->nlmsg_seq;
1645 struct nlattr *attrs[DP_GENL_A_MAX + 1];
1646 struct ofp_stats_request *rq;
1648 size_t len, body_len;
1651 err = nlmsg_parse(cb->nlh, GENL_HDRLEN, attrs, DP_GENL_A_MAX,
1652 dp_genl_openflow_policy);
1656 if (!attrs[DP_GENL_A_DP_IDX])
1658 dp_idx = nla_get_u16(attrs[DP_GENL_A_DP_IDX]);
1659 dp = dp_get(dp_idx);
1663 va = attrs[DP_GENL_A_OPENFLOW];
1665 if (!va || len < sizeof *rq)
1669 sender.xid = rq->header.xid;
1670 type = ntohs(rq->type);
1671 if (rq->header.version != OFP_VERSION) {
1672 dp_send_error_msg(dp, &sender, OFPET_BAD_REQUEST,
1673 OFPBRC_BAD_VERSION, rq, len);
1676 if (rq->header.type != OFPT_STATS_REQUEST
1677 || ntohs(rq->header.length) != len)
1680 if (type >= ARRAY_SIZE(stats) || !stats[type].dump) {
1681 dp_send_error_msg(dp, &sender, OFPET_BAD_REQUEST,
1682 OFPBRC_BAD_STAT, rq, len);
1687 body_len = len - offsetof(struct ofp_stats_request, body);
1688 if (body_len < s->min_body || body_len > s->max_body)
1692 cb->args[1] = dp_idx;
1694 cb->args[3] = rq->header.xid;
1697 err = s->init(dp, rq->body, body_len, &state);
1700 cb->args[4] = (long) state;
1702 } else if (cb->args[0] == 1) {
1703 sender.xid = cb->args[3];
1704 dp_idx = cb->args[1];
1705 s = &stats[cb->args[2]];
1707 dp = dp_get(dp_idx);
1714 osr = put_openflow_headers(dp, skb, OFPT_STATS_REPLY, &sender,
1717 return PTR_ERR(osr);
1718 osr->type = htons(s - stats);
1720 resize_openflow_skb(skb, &osr->header, max_openflow_len);
1722 body_len = max_openflow_len - offsetof(struct ofp_stats_reply, body);
1724 err = s->dump(dp, (void *) cb->args[4], body, &body_len);
1729 osr->flags = ntohs(OFPSF_REPLY_MORE);
1730 resize_openflow_skb(skb, &osr->header,
1731 (offsetof(struct ofp_stats_reply, body)
1740 dp_genl_openflow_done(struct netlink_callback *cb)
1743 const struct stats_type *s = &stats[cb->args[2]];
1745 s->done((void *) cb->args[4]);
1750 static struct genl_ops dp_genl_ops_openflow = {
1751 .cmd = DP_GENL_C_OPENFLOW,
1752 .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1753 .policy = dp_genl_openflow_policy,
1754 .doit = dp_genl_openflow,
1755 .dumpit = dp_genl_openflow_dumpit,
1758 static struct genl_ops *dp_genl_all_ops[] = {
1759 /* Keep this operation first. Generic Netlink dispatching
1760 * looks up operations with linear search, so we want it at the
1762 &dp_genl_ops_openflow,
1764 &dp_genl_ops_add_dp,
1765 &dp_genl_ops_del_dp,
1766 &dp_genl_ops_query_dp,
1767 &dp_genl_ops_add_port,
1768 &dp_genl_ops_del_port,
1771 static int dp_init_netlink(void)
1776 err = genl_register_family(&dp_genl_family);
1780 for (i = 0; i < ARRAY_SIZE(dp_genl_all_ops); i++) {
1781 err = genl_register_ops(&dp_genl_family, dp_genl_all_ops[i]);
1783 goto err_unregister;
1786 strcpy(mc_group.name, "openflow");
1787 err = genl_register_mc_group(&dp_genl_family, &mc_group);
1789 goto err_unregister;
1794 genl_unregister_family(&dp_genl_family);
1798 static void dp_uninit_netlink(void)
1800 genl_unregister_family(&dp_genl_family);
1803 static int __init dp_init(void)
1807 printk("OpenFlow "VERSION", built "__DATE__" "__TIME__", "
1808 "protocol 0x%02x\n", OFP_VERSION);
1814 err = register_netdevice_notifier(&dp_device_notifier);
1816 goto error_flow_exit;
1818 err = dp_init_netlink();
1820 goto error_unreg_notifier;
1822 /* Hook into callback used by the bridge to intercept packets.
1823 * Parasites we are. */
1824 if (br_handle_frame_hook)
1825 printk("openflow: hijacking bridge hook\n");
1826 br_handle_frame_hook = dp_frame_hook;
1830 error_unreg_notifier:
1831 unregister_netdevice_notifier(&dp_device_notifier);
1835 printk(KERN_EMERG "openflow: failed to install!");
1839 static void dp_cleanup(void)
1842 dp_uninit_netlink();
1843 unregister_netdevice_notifier(&dp_device_notifier);
1845 br_handle_frame_hook = NULL;
1848 module_init(dp_init);
1849 module_exit(dp_cleanup);
1851 MODULE_DESCRIPTION("OpenFlow switching datapath");
1852 MODULE_AUTHOR("Copyright (c) 2007, 2008 The Board of Trustees of The Leland Stanford Junior University");
1853 MODULE_LICENSE("GPL");