1	// SPDX-License-Identifier: GPL-2.0-only
2	/*
3	* Copyright (c) 2007-2014 Nicira, Inc.
4	*/
5
6	#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
7
8	#include <linux/init.h>
9	#include <linux/module.h>
10	#include <linux/if_arp.h>
11	#include <linux/if_vlan.h>
12	#include <linux/in.h>
13	#include <linux/ip.h>
14	#include <linux/jhash.h>
15	#include <linux/delay.h>
16	#include <linux/time.h>
17	#include <linux/etherdevice.h>
18	#include <linux/genetlink.h>
19	#include <linux/kernel.h>
20	#include <linux/kthread.h>
21	#include <linux/mutex.h>
22	#include <linux/percpu.h>
23	#include <linux/rcupdate.h>
24	#include <linux/tcp.h>
25	#include <linux/udp.h>
26	#include <linux/ethtool.h>
27	#include <linux/wait.h>
28	#include <asm/div64.h>
29	#include <linux/highmem.h>
30	#include <linux/netfilter_bridge.h>
31	#include <linux/netfilter_ipv4.h>
32	#include <linux/inetdevice.h>
33	#include <linux/list.h>
34	#include <linux/openvswitch.h>
35	#include <linux/rculist.h>
36	#include <linux/dmi.h>
37	#include <net/genetlink.h>
38	#include <net/gso.h>
39	#include <net/net_namespace.h>
40	#include <net/netns/generic.h>
41	#include <net/pkt_cls.h>
42
43	#include "datapath.h"
44	#include "drop.h"
45	#include "flow.h"
46	#include "flow_table.h"
47	#include "flow_netlink.h"
48	#include "meter.h"
49	#include "openvswitch_trace.h"
50	#include "vport-internal_dev.h"
51	#include "vport-netdev.h"
52
53	unsigned int ovs_net_id __read_mostly;
54
55	static struct genl_family dp_packet_genl_family;
56	static struct genl_family dp_flow_genl_family;
57	static struct genl_family dp_datapath_genl_family;
58
59	static const struct nla_policy flow_policy[];
60
61	static const struct genl_multicast_group ovs_dp_flow_multicast_group = {
62	.name = OVS_FLOW_MCGROUP,
63	};
64
65	static const struct genl_multicast_group ovs_dp_datapath_multicast_group = {
66	.name = OVS_DATAPATH_MCGROUP,
67	};
68
69	static const struct genl_multicast_group ovs_dp_vport_multicast_group = {
70	.name = OVS_VPORT_MCGROUP,
71	};
72
73	/* Check if need to build a reply message.
74	* OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */
75	static bool ovs_must_notify(struct genl_family *family, struct genl_info *info,
76	unsigned int group)
77	{
78	return info->nlhdr->nlmsg_flags & NLM_F_ECHO ||
79	genl_has_listeners(family, net: genl_info_net(info), group);
80	}
81
82	static void ovs_notify(struct genl_family *family,
83	struct sk_buff *skb, struct genl_info *info)
84	{
85	genl_notify(family, skb, info, group: 0, GFP_KERNEL);
86	}
87
88	/**
89	* DOC: Locking:
90	*
91	* All writes e.g. Writes to device state (add/remove datapath, port, set
92	* operations on vports, etc.), Writes to other state (flow table
93	* modifications, set miscellaneous datapath parameters, etc.) are protected
94	* by ovs_lock.
95	*
96	* Reads are protected by RCU.
97	*
98	* There are a few special cases (mostly stats) that have their own
99	* synchronization but they nest under all of above and don't interact with
100	* each other.
101	*
102	* The RTNL lock nests inside ovs_mutex.
103	*/
104
105	static DEFINE_MUTEX(ovs_mutex);
106
107	void ovs_lock(void)
108	{
109	mutex_lock(&ovs_mutex);
110	}
111
112	void ovs_unlock(void)
113	{
114	mutex_unlock(lock: &ovs_mutex);
115	}
116
117	#ifdef CONFIG_LOCKDEP
118	int lockdep_ovsl_is_held(void)
119	{
120	if (debug_locks)
121	return lockdep_is_held(&ovs_mutex);
122	else
123	return 1;
124	}
125	#endif
126
127	static struct vport *new_vport(const struct vport_parms *);
128	static int queue_gso_packets(struct datapath *dp, struct sk_buff *,
129	const struct sw_flow_key *,
130	const struct dp_upcall_info *,
131	uint32_t cutlen);
132	static int queue_userspace_packet(struct datapath *dp, struct sk_buff *,
133	const struct sw_flow_key *,
134	const struct dp_upcall_info *,
135	uint32_t cutlen);
136
137	static void ovs_dp_masks_rebalance(struct work_struct *work);
138
139	static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *);
140
141	/* Must be called with rcu_read_lock or ovs_mutex. */
142	const char *ovs_dp_name(const struct datapath *dp)
143	{
144	struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL);
145	return ovs_vport_name(vport);
146	}
147
148	static int get_dpifindex(const struct datapath *dp)
149	{
150	struct vport *local;
151	int ifindex;
152
153	rcu_read_lock();
154
155	local = ovs_vport_rcu(dp, OVSP_LOCAL);
156	if (local)
157	ifindex = local->dev->ifindex;
158	else
159	ifindex = 0;
160
161	rcu_read_unlock();
162
163	return ifindex;
164	}
165
166	static void destroy_dp_rcu(struct rcu_head *rcu)
167	{
168	struct datapath *dp = container_of(rcu, struct datapath, rcu);
169
170	ovs_flow_tbl_destroy(table: &dp->table);
171	free_percpu(pdata: dp->stats_percpu);
172	kfree(objp: dp->ports);
173	ovs_meters_exit(dp);
174	kfree(rcu_dereference_raw(dp->upcall_portids));
175	kfree(objp: dp);
176	}
177
178	static struct hlist_head *vport_hash_bucket(const struct datapath *dp,
179	u16 port_no)
180	{
181	return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)];
182	}
183
184	/* Called with ovs_mutex or RCU read lock. */
185	struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no)
186	{
187	struct vport *vport;
188	struct hlist_head *head;
189
190	head = vport_hash_bucket(dp, port_no);
191	hlist_for_each_entry_rcu(vport, head, dp_hash_node,
192	lockdep_ovsl_is_held()) {
193	if (vport->port_no == port_no)
194	return vport;
195	}
196	return NULL;
197	}
198
199	/* Called with ovs_mutex. */
200	static struct vport *new_vport(const struct vport_parms *parms)
201	{
202	struct vport *vport;
203
204	vport = ovs_vport_add(parms);
205	if (!IS_ERR(ptr: vport)) {
206	struct datapath *dp = parms->dp;
207	struct hlist_head *head = vport_hash_bucket(dp, port_no: vport->port_no);
208
209	hlist_add_head_rcu(n: &vport->dp_hash_node, h: head);
210	}
211	return vport;
212	}
213
214	static void ovs_vport_update_upcall_stats(struct sk_buff *skb,
215	const struct dp_upcall_info *upcall_info,
216	bool upcall_result)
217	{
218	struct vport *p = OVS_CB(skb)->input_vport;
219	struct vport_upcall_stats_percpu *stats;
220
221	if (upcall_info->cmd != OVS_PACKET_CMD_MISS &&
222	upcall_info->cmd != OVS_PACKET_CMD_ACTION)
223	return;
224
225	stats = this_cpu_ptr(p->upcall_stats);
226	u64_stats_update_begin(syncp: &stats->syncp);
227	if (upcall_result)
228	u64_stats_inc(p: &stats->n_success);
229	else
230	u64_stats_inc(p: &stats->n_fail);
231	u64_stats_update_end(syncp: &stats->syncp);
232	}
233
234	void ovs_dp_detach_port(struct vport *p)
235	{
236	ASSERT_OVSL();
237
238	/* First drop references to device. */
239	hlist_del_rcu(n: &p->dp_hash_node);
240
241	/* Then destroy it. */
242	ovs_vport_del(p);
243	}
244
245	/* Must be called with rcu_read_lock. */
246	void ovs_dp_process_packet(struct sk_buff *skb, struct sw_flow_key *key)
247	{
248	const struct vport *p = OVS_CB(skb)->input_vport;
249	struct datapath *dp = p->dp;
250	struct sw_flow *flow;
251	struct sw_flow_actions *sf_acts;
252	struct dp_stats_percpu *stats;
253	u64 *stats_counter;
254	u32 n_mask_hit;
255	u32 n_cache_hit;
256	int error;
257
258	stats = this_cpu_ptr(dp->stats_percpu);
259
260	/* Look up flow. */
261	flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_hash: skb_get_hash(skb),
262	n_mask_hit: &n_mask_hit, n_cache_hit: &n_cache_hit);
263	if (unlikely(!flow)) {
264	struct dp_upcall_info upcall;
265
266	memset(&upcall, 0, sizeof(upcall));
267	upcall.cmd = OVS_PACKET_CMD_MISS;
268
269	if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU)
270	upcall.portid =
271	ovs_dp_get_upcall_portid(dp, smp_processor_id());
272	else
273	upcall.portid = ovs_vport_find_upcall_portid(p, skb);
274
275	upcall.mru = OVS_CB(skb)->mru;
276	error = ovs_dp_upcall(dp, skb, key, &upcall, cutlen: 0);
277	switch (error) {
278	case 0:
279	case -EAGAIN:
280	case -ERESTARTSYS:
281	case -EINTR:
282	consume_skb(skb);
283	break;
284	default:
285	kfree_skb(skb);
286	break;
287	}
288	stats_counter = &stats->n_missed;
289	goto out;
290	}
291
292	ovs_flow_stats_update(flow, tcp_flags: key->tp.flags, skb);
293	sf_acts = rcu_dereference(flow->sf_acts);
294	error = ovs_execute_actions(dp, skb, sf_acts, key);
295	if (unlikely(error))
296	net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n",
297	ovs_dp_name(dp), error);
298
299	stats_counter = &stats->n_hit;
300
301	out:
302	/* Update datapath statistics. */
303	u64_stats_update_begin(syncp: &stats->syncp);
304	(*stats_counter)++;
305	stats->n_mask_hit += n_mask_hit;
306	stats->n_cache_hit += n_cache_hit;
307	u64_stats_update_end(syncp: &stats->syncp);
308	}
309
310	int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb,
311	const struct sw_flow_key *key,
312	const struct dp_upcall_info *upcall_info,
313	uint32_t cutlen)
314	{
315	struct dp_stats_percpu *stats;
316	int err;
317
318	if (trace_ovs_dp_upcall_enabled())
319	trace_ovs_dp_upcall(dp, skb, key, upcall_info);
320
321	if (upcall_info->portid == 0) {
322	err = -ENOTCONN;
323	goto err;
324	}
325
326	if (!skb_is_gso(skb))
327	err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
328	else
329	err = queue_gso_packets(dp, skb, key, upcall_info, cutlen);
330
331	ovs_vport_update_upcall_stats(skb, upcall_info, upcall_result: !err);
332	if (err)
333	goto err;
334
335	return 0;
336
337	err:
338	stats = this_cpu_ptr(dp->stats_percpu);
339
340	u64_stats_update_begin(syncp: &stats->syncp);
341	stats->n_lost++;
342	u64_stats_update_end(syncp: &stats->syncp);
343
344	return err;
345	}
346
347	static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb,
348	const struct sw_flow_key *key,
349	const struct dp_upcall_info *upcall_info,
350	uint32_t cutlen)
351	{
352	unsigned int gso_type = skb_shinfo(skb)->gso_type;
353	struct sw_flow_key later_key;
354	struct sk_buff *segs, *nskb;
355	int err;
356
357	BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET);
358	segs = __skb_gso_segment(skb, NETIF_F_SG, tx_path: false);
359	if (IS_ERR(ptr: segs))
360	return PTR_ERR(ptr: segs);
361	if (segs == NULL)
362	return -EINVAL;
363
364	if (gso_type & SKB_GSO_UDP) {
365	/* The initial flow key extracted by ovs_flow_key_extract()
366	* in this case is for a first fragment, so we need to
367	* properly mark later fragments.
368	*/
369	later_key = *key;
370	later_key.ip.frag = OVS_FRAG_TYPE_LATER;
371	}
372
373	/* Queue all of the segments. */
374	skb_list_walk_safe(segs, skb, nskb) {
375	if (gso_type & SKB_GSO_UDP && skb != segs)
376	key = &later_key;
377
378	err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen);
379	if (err)
380	break;
381
382	}
383
384	/* Free all of the segments. */
385	skb_list_walk_safe(segs, skb, nskb) {
386	if (err)
387	kfree_skb(skb);
388	else
389	consume_skb(skb);
390	}
391	return err;
392	}
393
394	static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info,
395	unsigned int hdrlen, int actions_attrlen)
396	{
397	size_t size = NLMSG_ALIGN(sizeof(struct ovs_header))
398	+ nla_total_size(payload: hdrlen) /* OVS_PACKET_ATTR_PACKET */
399	+ nla_total_size(payload: ovs_key_attr_size()) /* OVS_PACKET_ATTR_KEY */
400	+ nla_total_size(payload: sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */
401	+ nla_total_size(payload: sizeof(u64)); /* OVS_PACKET_ATTR_HASH */
402
403	/* OVS_PACKET_ATTR_USERDATA */
404	if (upcall_info->userdata)
405	size += NLA_ALIGN(upcall_info->userdata->nla_len);
406
407	/* OVS_PACKET_ATTR_EGRESS_TUN_KEY */
408	if (upcall_info->egress_tun_info)
409	size += nla_total_size(payload: ovs_tun_key_attr_size());
410
411	/* OVS_PACKET_ATTR_ACTIONS */
412	if (upcall_info->actions_len)
413	size += nla_total_size(payload: actions_attrlen);
414
415	/* OVS_PACKET_ATTR_MRU */
416	if (upcall_info->mru)
417	size += nla_total_size(payload: sizeof(upcall_info->mru));
418
419	return size;
420	}
421
422	static void pad_packet(struct datapath *dp, struct sk_buff *skb)
423	{
424	if (!(dp->user_features & OVS_DP_F_UNALIGNED)) {
425	size_t plen = NLA_ALIGN(skb->len) - skb->len;
426
427	if (plen > 0)
428	skb_put_zero(skb, len: plen);
429	}
430	}
431
432	static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb,
433	const struct sw_flow_key *key,
434	const struct dp_upcall_info *upcall_info,
435	uint32_t cutlen)
436	{
437	struct ovs_header *upcall;
438	struct sk_buff *nskb = NULL;
439	struct sk_buff *user_skb = NULL; /* to be queued to userspace */
440	struct nlattr *nla;
441	size_t len;
442	unsigned int hlen;
443	int err, dp_ifindex;
444	u64 hash;
445
446	dp_ifindex = get_dpifindex(dp);
447	if (!dp_ifindex)
448	return -ENODEV;
449
450	if (skb_vlan_tag_present(skb)) {
451	nskb = skb_clone(skb, GFP_ATOMIC);
452	if (!nskb)
453	return -ENOMEM;
454
455	nskb = __vlan_hwaccel_push_inside(skb: nskb);
456	if (!nskb)
457	return -ENOMEM;
458
459	skb = nskb;
460	}
461
462	if (nla_attr_size(payload: skb->len) > USHRT_MAX) {
463	err = -EFBIG;
464	goto out;
465	}
466
467	/* Complete checksum if needed */
468	if (skb->ip_summed == CHECKSUM_PARTIAL &&
469	(err = skb_csum_hwoffload_help(skb, features: 0)))
470	goto out;
471
472	/* Older versions of OVS user space enforce alignment of the last
473	* Netlink attribute to NLA_ALIGNTO which would require extensive
474	* padding logic. Only perform zerocopy if padding is not required.
475	*/
476	if (dp->user_features & OVS_DP_F_UNALIGNED)
477	hlen = skb_zerocopy_headlen(from: skb);
478	else
479	hlen = skb->len;
480
481	len = upcall_msg_size(upcall_info, hdrlen: hlen - cutlen,
482	OVS_CB(skb)->acts_origlen);
483	user_skb = genlmsg_new(payload: len, GFP_ATOMIC);
484	if (!user_skb) {
485	err = -ENOMEM;
486	goto out;
487	}
488
489	upcall = genlmsg_put(skb: user_skb, portid: 0, seq: 0, family: &dp_packet_genl_family,
490	flags: 0, cmd: upcall_info->cmd);
491	if (!upcall) {
492	err = -EINVAL;
493	goto out;
494	}
495	upcall->dp_ifindex = dp_ifindex;
496
497	err = ovs_nla_put_key(key, key, attr: OVS_PACKET_ATTR_KEY, is_mask: false, user_skb);
498	if (err)
499	goto out;
500
501	if (upcall_info->userdata)
502	__nla_put(skb: user_skb, attrtype: OVS_PACKET_ATTR_USERDATA,
503	attrlen: nla_len(nla: upcall_info->userdata),
504	data: nla_data(nla: upcall_info->userdata));
505
506	if (upcall_info->egress_tun_info) {
507	nla = nla_nest_start_noflag(skb: user_skb,
508	attrtype: OVS_PACKET_ATTR_EGRESS_TUN_KEY);
509	if (!nla) {
510	err = -EMSGSIZE;
511	goto out;
512	}
513	err = ovs_nla_put_tunnel_info(skb: user_skb,
514	tun_info: upcall_info->egress_tun_info);
515	if (err)
516	goto out;
517
518	nla_nest_end(skb: user_skb, start: nla);
519	}
520
521	if (upcall_info->actions_len) {
522	nla = nla_nest_start_noflag(skb: user_skb, attrtype: OVS_PACKET_ATTR_ACTIONS);
523	if (!nla) {
524	err = -EMSGSIZE;
525	goto out;
526	}
527	err = ovs_nla_put_actions(attr: upcall_info->actions,
528	len: upcall_info->actions_len,
529	skb: user_skb);
530	if (!err)
531	nla_nest_end(skb: user_skb, start: nla);
532	else
533	nla_nest_cancel(skb: user_skb, start: nla);
534	}
535
536	/* Add OVS_PACKET_ATTR_MRU */
537	if (upcall_info->mru &&
538	nla_put_u16(skb: user_skb, attrtype: OVS_PACKET_ATTR_MRU, value: upcall_info->mru)) {
539	err = -ENOBUFS;
540	goto out;
541	}
542
543	/* Add OVS_PACKET_ATTR_LEN when packet is truncated */
544	if (cutlen > 0 &&
545	nla_put_u32(skb: user_skb, attrtype: OVS_PACKET_ATTR_LEN, value: skb->len)) {
546	err = -ENOBUFS;
547	goto out;
548	}
549
550	/* Add OVS_PACKET_ATTR_HASH */
551	hash = skb_get_hash_raw(skb);
552	if (skb->sw_hash)
553	hash |= OVS_PACKET_HASH_SW_BIT;
554
555	if (skb->l4_hash)
556	hash |= OVS_PACKET_HASH_L4_BIT;
557
558	if (nla_put(skb: user_skb, attrtype: OVS_PACKET_ATTR_HASH, attrlen: sizeof (u64), data: &hash)) {
559	err = -ENOBUFS;
560	goto out;
561	}
562
563	/* Only reserve room for attribute header, packet data is added
564	* in skb_zerocopy() */
565	if (!(nla = nla_reserve(skb: user_skb, attrtype: OVS_PACKET_ATTR_PACKET, attrlen: 0))) {
566	err = -ENOBUFS;
567	goto out;
568	}
569	nla->nla_len = nla_attr_size(payload: skb->len - cutlen);
570
571	err = skb_zerocopy(to: user_skb, from: skb, len: skb->len - cutlen, hlen);
572	if (err)
573	goto out;
574
575	/* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */
576	pad_packet(dp, skb: user_skb);
577
578	((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len;
579
580	err = genlmsg_unicast(net: ovs_dp_get_net(dp), skb: user_skb, portid: upcall_info->portid);
581	user_skb = NULL;
582	out:
583	if (err)
584	skb_tx_error(skb);
585	consume_skb(skb: user_skb);
586	consume_skb(skb: nskb);
587
588	return err;
589	}
590
591	static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info)
592	{
593	struct ovs_header *ovs_header = genl_info_userhdr(info);
594	struct net *net = sock_net(sk: skb->sk);
595	struct nlattr **a = info->attrs;
596	struct sw_flow_actions *acts;
597	struct sk_buff *packet;
598	struct sw_flow *flow;
599	struct sw_flow_actions *sf_acts;
600	struct datapath *dp;
601	struct vport *input_vport;
602	u16 mru = 0;
603	u64 hash;
604	int len;
605	int err;
606	bool log = !a[OVS_PACKET_ATTR_PROBE];
607
608	err = -EINVAL;
609	if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] ||
610	!a[OVS_PACKET_ATTR_ACTIONS])
611	goto err;
612
613	len = nla_len(nla: a[OVS_PACKET_ATTR_PACKET]);
614	packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL);
615	err = -ENOMEM;
616	if (!packet)
617	goto err;
618	skb_reserve(skb: packet, NET_IP_ALIGN);
619
620	nla_memcpy(dest: __skb_put(skb: packet, len), src: a[OVS_PACKET_ATTR_PACKET], count: len);
621
622	/* Set packet's mru */
623	if (a[OVS_PACKET_ATTR_MRU]) {
624	mru = nla_get_u16(nla: a[OVS_PACKET_ATTR_MRU]);
625	packet->ignore_df = 1;
626	}
627	OVS_CB(packet)->mru = mru;
628
629	if (a[OVS_PACKET_ATTR_HASH]) {
630	hash = nla_get_u64(nla: a[OVS_PACKET_ATTR_HASH]);
631
632	__skb_set_hash(skb: packet, hash: hash & 0xFFFFFFFFULL,
633	is_sw: !!(hash & OVS_PACKET_HASH_SW_BIT),
634	is_l4: !!(hash & OVS_PACKET_HASH_L4_BIT));
635	}
636
637	/* Build an sw_flow for sending this packet. */
638	flow = ovs_flow_alloc();
639	err = PTR_ERR(ptr: flow);
640	if (IS_ERR(ptr: flow))
641	goto err_kfree_skb;
642
643	err = ovs_flow_key_extract_userspace(net, attr: a[OVS_PACKET_ATTR_KEY],
644	skb: packet, key: &flow->key, log);
645	if (err)
646	goto err_flow_free;
647
648	err = ovs_nla_copy_actions(net, attr: a[OVS_PACKET_ATTR_ACTIONS],
649	key: &flow->key, sfa: &acts, log);
650	if (err)
651	goto err_flow_free;
652
653	rcu_assign_pointer(flow->sf_acts, acts);
654	packet->priority = flow->key.phy.priority;
655	packet->mark = flow->key.phy.skb_mark;
656
657	rcu_read_lock();
658	dp = get_dp_rcu(net, dp_ifindex: ovs_header->dp_ifindex);
659	err = -ENODEV;
660	if (!dp)
661	goto err_unlock;
662
663	input_vport = ovs_vport_rcu(dp, port_no: flow->key.phy.in_port);
664	if (!input_vport)
665	input_vport = ovs_vport_rcu(dp, OVSP_LOCAL);
666
667	if (!input_vport)
668	goto err_unlock;
669
670	packet->dev = input_vport->dev;
671	OVS_CB(packet)->input_vport = input_vport;
672	sf_acts = rcu_dereference(flow->sf_acts);
673
674	local_bh_disable();
675	err = ovs_execute_actions(dp, skb: packet, sf_acts, &flow->key);
676	local_bh_enable();
677	rcu_read_unlock();
678
679	ovs_flow_free(flow, deferred: false);
680	return err;
681
682	err_unlock:
683	rcu_read_unlock();
684	err_flow_free:
685	ovs_flow_free(flow, deferred: false);
686	err_kfree_skb:
687	kfree_skb(skb: packet);
688	err:
689	return err;
690	}
691
692	static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = {
693	[OVS_PACKET_ATTR_PACKET] = { .len = ETH_HLEN },
694	[OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED },
695	[OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED },
696	[OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG },
697	[OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 },
698	[OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 },
699	};
700
701	static const struct genl_small_ops dp_packet_genl_ops[] = {
702	{ .cmd = OVS_PACKET_CMD_EXECUTE,
703	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
704	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
705	.doit = ovs_packet_cmd_execute
706	}
707	};
708
709	static struct genl_family dp_packet_genl_family __ro_after_init = {
710	.hdrsize = sizeof(struct ovs_header),
711	.name = OVS_PACKET_FAMILY,
712	.version = OVS_PACKET_VERSION,
713	.maxattr = OVS_PACKET_ATTR_MAX,
714	.policy = packet_policy,
715	.netnsok = true,
716	.parallel_ops = true,
717	.small_ops = dp_packet_genl_ops,
718	.n_small_ops = ARRAY_SIZE(dp_packet_genl_ops),
719	.resv_start_op = OVS_PACKET_CMD_EXECUTE + 1,
720	.module = THIS_MODULE,
721	};
722
723	static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats,
724	struct ovs_dp_megaflow_stats *mega_stats)
725	{
726	int i;
727
728	memset(mega_stats, 0, sizeof(*mega_stats));
729
730	stats->n_flows = ovs_flow_tbl_count(table: &dp->table);
731	mega_stats->n_masks = ovs_flow_tbl_num_masks(table: &dp->table);
732
733	stats->n_hit = stats->n_missed = stats->n_lost = 0;
734
735	for_each_possible_cpu(i) {
736	const struct dp_stats_percpu *percpu_stats;
737	struct dp_stats_percpu local_stats;
738	unsigned int start;
739
740	percpu_stats = per_cpu_ptr(dp->stats_percpu, i);
741
742	do {
743	start = u64_stats_fetch_begin(syncp: &percpu_stats->syncp);
744	local_stats = *percpu_stats;
745	} while (u64_stats_fetch_retry(syncp: &percpu_stats->syncp, start));
746
747	stats->n_hit += local_stats.n_hit;
748	stats->n_missed += local_stats.n_missed;
749	stats->n_lost += local_stats.n_lost;
750	mega_stats->n_mask_hit += local_stats.n_mask_hit;
751	mega_stats->n_cache_hit += local_stats.n_cache_hit;
752	}
753	}
754
755	static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags)
756	{
757	return ovs_identifier_is_ufid(sfid) &&
758	!(ufid_flags & OVS_UFID_F_OMIT_KEY);
759	}
760
761	static bool should_fill_mask(uint32_t ufid_flags)
762	{
763	return !(ufid_flags & OVS_UFID_F_OMIT_MASK);
764	}
765
766	static bool should_fill_actions(uint32_t ufid_flags)
767	{
768	return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS);
769	}
770
771	static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts,
772	const struct sw_flow_id *sfid,
773	uint32_t ufid_flags)
774	{
775	size_t len = NLMSG_ALIGN(sizeof(struct ovs_header));
776
777	/* OVS_FLOW_ATTR_UFID, or unmasked flow key as fallback
778	* see ovs_nla_put_identifier()
779	*/
780	if (sfid && ovs_identifier_is_ufid(sfid))
781	len += nla_total_size(payload: sfid->ufid_len);
782	else
783	len += nla_total_size(payload: ovs_key_attr_size());
784
785	/* OVS_FLOW_ATTR_KEY */
786	if (!sfid || should_fill_key(sfid, ufid_flags))
787	len += nla_total_size(payload: ovs_key_attr_size());
788
789	/* OVS_FLOW_ATTR_MASK */
790	if (should_fill_mask(ufid_flags))
791	len += nla_total_size(payload: ovs_key_attr_size());
792
793	/* OVS_FLOW_ATTR_ACTIONS */
794	if (should_fill_actions(ufid_flags))
795	len += nla_total_size(payload: acts->orig_len);
796
797	return len
798	+ nla_total_size_64bit(payload: sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */
799	+ nla_total_size(payload: 1) /* OVS_FLOW_ATTR_TCP_FLAGS */
800	+ nla_total_size_64bit(payload: 8); /* OVS_FLOW_ATTR_USED */
801	}
802
803	/* Called with ovs_mutex or RCU read lock. */
804	static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow,
805	struct sk_buff *skb)
806	{
807	struct ovs_flow_stats stats;
808	__be16 tcp_flags;
809	unsigned long used;
810
811	ovs_flow_stats_get(flow, &stats, used: &used, tcp_flags: &tcp_flags);
812
813	if (used &&
814	nla_put_u64_64bit(skb, attrtype: OVS_FLOW_ATTR_USED, value: ovs_flow_used_time(flow_jiffies: used),
815	padattr: OVS_FLOW_ATTR_PAD))
816	return -EMSGSIZE;
817
818	if (stats.n_packets &&
819	nla_put_64bit(skb, attrtype: OVS_FLOW_ATTR_STATS,
820	attrlen: sizeof(struct ovs_flow_stats), data: &stats,
821	padattr: OVS_FLOW_ATTR_PAD))
822	return -EMSGSIZE;
823
824	if ((u8)ntohs(tcp_flags) &&
825	nla_put_u8(skb, attrtype: OVS_FLOW_ATTR_TCP_FLAGS, value: (u8)ntohs(tcp_flags)))
826	return -EMSGSIZE;
827
828	return 0;
829	}
830
831	/* Called with ovs_mutex or RCU read lock. */
832	static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow,
833	struct sk_buff *skb, int skb_orig_len)
834	{
835	struct nlattr *start;
836	int err;
837
838	/* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if
839	* this is the first flow to be dumped into 'skb'. This is unusual for
840	* Netlink but individual action lists can be longer than
841	* NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this.
842	* The userspace caller can always fetch the actions separately if it
843	* really wants them. (Most userspace callers in fact don't care.)
844	*
845	* This can only fail for dump operations because the skb is always
846	* properly sized for single flows.
847	*/
848	start = nla_nest_start_noflag(skb, attrtype: OVS_FLOW_ATTR_ACTIONS);
849	if (start) {
850	const struct sw_flow_actions *sf_acts;
851
852	sf_acts = rcu_dereference_ovsl(flow->sf_acts);
853	err = ovs_nla_put_actions(attr: sf_acts->actions,
854	len: sf_acts->actions_len, skb);
855
856	if (!err)
857	nla_nest_end(skb, start);
858	else {
859	if (skb_orig_len)
860	return err;
861
862	nla_nest_cancel(skb, start);
863	}
864	} else if (skb_orig_len) {
865	return -EMSGSIZE;
866	}
867
868	return 0;
869	}
870
871	/* Called with ovs_mutex or RCU read lock. */
872	static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex,
873	struct sk_buff *skb, u32 portid,
874	u32 seq, u32 flags, u8 cmd, u32 ufid_flags)
875	{
876	const int skb_orig_len = skb->len;
877	struct ovs_header *ovs_header;
878	int err;
879
880	ovs_header = genlmsg_put(skb, portid, seq, family: &dp_flow_genl_family,
881	flags, cmd);
882	if (!ovs_header)
883	return -EMSGSIZE;
884
885	ovs_header->dp_ifindex = dp_ifindex;
886
887	err = ovs_nla_put_identifier(flow, skb);
888	if (err)
889	goto error;
890
891	if (should_fill_key(sfid: &flow->id, ufid_flags)) {
892	err = ovs_nla_put_masked_key(flow, skb);
893	if (err)
894	goto error;
895	}
896
897	if (should_fill_mask(ufid_flags)) {
898	err = ovs_nla_put_mask(flow, skb);
899	if (err)
900	goto error;
901	}
902
903	err = ovs_flow_cmd_fill_stats(flow, skb);
904	if (err)
905	goto error;
906
907	if (should_fill_actions(ufid_flags)) {
908	err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len);
909	if (err)
910	goto error;
911	}
912
913	genlmsg_end(skb, hdr: ovs_header);
914	return 0;
915
916	error:
917	genlmsg_cancel(skb, hdr: ovs_header);
918	return err;
919	}
920
921	/* May not be called with RCU read lock. */
922	static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts,
923	const struct sw_flow_id *sfid,
924	struct genl_info *info,
925	bool always,
926	uint32_t ufid_flags)
927	{
928	struct sk_buff *skb;
929	size_t len;
930
931	if (!always && !ovs_must_notify(family: &dp_flow_genl_family, info, group: 0))
932	return NULL;
933
934	len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags);
935	skb = genlmsg_new(payload: len, GFP_KERNEL);
936	if (!skb)
937	return ERR_PTR(error: -ENOMEM);
938
939	return skb;
940	}
941
942	/* Called with ovs_mutex. */
943	static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow,
944	int dp_ifindex,
945	struct genl_info *info, u8 cmd,
946	bool always, u32 ufid_flags)
947	{
948	struct sk_buff *skb;
949	int retval;
950
951	skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts),
952	sfid: &flow->id, info, always, ufid_flags);
953	if (IS_ERR_OR_NULL(ptr: skb))
954	return skb;
955
956	retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb,
957	portid: info->snd_portid, seq: info->snd_seq, flags: 0,
958	cmd, ufid_flags);
959	if (WARN_ON_ONCE(retval < 0)) {
960	kfree_skb(skb);
961	skb = ERR_PTR(error: retval);
962	}
963	return skb;
964	}
965
966	static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info)
967	{
968	struct net *net = sock_net(sk: skb->sk);
969	struct nlattr **a = info->attrs;
970	struct ovs_header *ovs_header = genl_info_userhdr(info);
971	struct sw_flow *flow = NULL, *new_flow;
972	struct sw_flow_mask mask;
973	struct sk_buff *reply;
974	struct datapath *dp;
975	struct sw_flow_key *key;
976	struct sw_flow_actions *acts;
977	struct sw_flow_match match;
978	u32 ufid_flags = ovs_nla_get_ufid_flags(attr: a[OVS_FLOW_ATTR_UFID_FLAGS]);
979	int error;
980	bool log = !a[OVS_FLOW_ATTR_PROBE];
981
982	/* Must have key and actions. */
983	error = -EINVAL;
984	if (!a[OVS_FLOW_ATTR_KEY]) {
985	OVS_NLERR(log, "Flow key attr not present in new flow.");
986	goto error;
987	}
988	if (!a[OVS_FLOW_ATTR_ACTIONS]) {
989	OVS_NLERR(log, "Flow actions attr not present in new flow.");
990	goto error;
991	}
992
993	/* Most of the time we need to allocate a new flow, do it before
994	* locking.
995	*/
996	new_flow = ovs_flow_alloc();
997	if (IS_ERR(ptr: new_flow)) {
998	error = PTR_ERR(ptr: new_flow);
999	goto error;
1000	}
1001
1002	/* Extract key. */
1003	key = kzalloc(size: sizeof(*key), GFP_KERNEL);
1004	if (!key) {
1005	error = -ENOMEM;
1006	goto err_kfree_flow;
1007	}
1008
1009	ovs_match_init(match: &match, key, reset_key: false, mask: &mask);
1010	error = ovs_nla_get_match(net, &match, key: a[OVS_FLOW_ATTR_KEY],
1011	mask: a[OVS_FLOW_ATTR_MASK], log);
1012	if (error)
1013	goto err_kfree_key;
1014
1015	ovs_flow_mask_key(dst: &new_flow->key, src: key, full: true, mask: &mask);
1016
1017	/* Extract flow identifier. */
1018	error = ovs_nla_get_identifier(sfid: &new_flow->id, ufid: a[OVS_FLOW_ATTR_UFID],
1019	key, log);
1020	if (error)
1021	goto err_kfree_key;
1022
1023	/* Validate actions. */
1024	error = ovs_nla_copy_actions(net, attr: a[OVS_FLOW_ATTR_ACTIONS],
1025	key: &new_flow->key, sfa: &acts, log);
1026	if (error) {
1027	OVS_NLERR(log, "Flow actions may not be safe on all matching packets.");
1028	goto err_kfree_key;
1029	}
1030
1031	reply = ovs_flow_cmd_alloc_info(acts, sfid: &new_flow->id, info, always: false,
1032	ufid_flags);
1033	if (IS_ERR(ptr: reply)) {
1034	error = PTR_ERR(ptr: reply);
1035	goto err_kfree_acts;
1036	}
1037
1038	ovs_lock();
1039	dp = get_dp(net, dp_ifindex: ovs_header->dp_ifindex);
1040	if (unlikely(!dp)) {
1041	error = -ENODEV;
1042	goto err_unlock_ovs;
1043	}
1044
1045	/* Check if this is a duplicate flow */
1046	if (ovs_identifier_is_ufid(sfid: &new_flow->id))
1047	flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id);
1048	if (!flow)
1049	flow = ovs_flow_tbl_lookup(&dp->table, key);
1050	if (likely(!flow)) {
1051	rcu_assign_pointer(new_flow->sf_acts, acts);
1052
1053	/* Put flow in bucket. */
1054	error = ovs_flow_tbl_insert(table: &dp->table, flow: new_flow, mask: &mask);
1055	if (unlikely(error)) {
1056	acts = NULL;
1057	goto err_unlock_ovs;
1058	}
1059
1060	if (unlikely(reply)) {
1061	error = ovs_flow_cmd_fill_info(flow: new_flow,
1062	dp_ifindex: ovs_header->dp_ifindex,
1063	skb: reply, portid: info->snd_portid,
1064	seq: info->snd_seq, flags: 0,
1065	cmd: OVS_FLOW_CMD_NEW,
1066	ufid_flags);
1067	BUG_ON(error < 0);
1068	}
1069	ovs_unlock();
1070	} else {
1071	struct sw_flow_actions *old_acts;
1072
1073	/* Bail out if we're not allowed to modify an existing flow.
1074	* We accept NLM_F_CREATE in place of the intended NLM_F_EXCL
1075	* because Generic Netlink treats the latter as a dump
1076	* request. We also accept NLM_F_EXCL in case that bug ever
1077	* gets fixed.
1078	*/
1079	if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE
1080	| NLM_F_EXCL))) {
1081	error = -EEXIST;
1082	goto err_unlock_ovs;
1083	}
1084	/* The flow identifier has to be the same for flow updates.
1085	* Look for any overlapping flow.
1086	*/
1087	if (unlikely(!ovs_flow_cmp(flow, &match))) {
1088	if (ovs_identifier_is_key(sfid: &flow->id))
1089	flow = ovs_flow_tbl_lookup_exact(tbl: &dp->table,
1090	match: &match);
1091	else /* UFID matches but key is different */
1092	flow = NULL;
1093	if (!flow) {
1094	error = -ENOENT;
1095	goto err_unlock_ovs;
1096	}
1097	}
1098	/* Update actions. */
1099	old_acts = ovsl_dereference(flow->sf_acts);
1100	rcu_assign_pointer(flow->sf_acts, acts);
1101
1102	if (unlikely(reply)) {
1103	error = ovs_flow_cmd_fill_info(flow,
1104	dp_ifindex: ovs_header->dp_ifindex,
1105	skb: reply, portid: info->snd_portid,
1106	seq: info->snd_seq, flags: 0,
1107	cmd: OVS_FLOW_CMD_NEW,
1108	ufid_flags);
1109	BUG_ON(error < 0);
1110	}
1111	ovs_unlock();
1112
1113	ovs_nla_free_flow_actions_rcu(old_acts);
1114	ovs_flow_free(new_flow, deferred: false);
1115	}
1116
1117	if (reply)
1118	ovs_notify(family: &dp_flow_genl_family, skb: reply, info);
1119
1120	kfree(objp: key);
1121	return 0;
1122
1123	err_unlock_ovs:
1124	ovs_unlock();
1125	kfree_skb(skb: reply);
1126	err_kfree_acts:
1127	ovs_nla_free_flow_actions(acts);
1128	err_kfree_key:
1129	kfree(objp: key);
1130	err_kfree_flow:
1131	ovs_flow_free(new_flow, deferred: false);
1132	error:
1133	return error;
1134	}
1135
1136	/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */
1137	static noinline_for_stack
1138	struct sw_flow_actions *get_flow_actions(struct net *net,
1139	const struct nlattr *a,
1140	const struct sw_flow_key *key,
1141	const struct sw_flow_mask *mask,
1142	bool log)
1143	{
1144	struct sw_flow_actions *acts;
1145	struct sw_flow_key masked_key;
1146	int error;
1147
1148	ovs_flow_mask_key(dst: &masked_key, src: key, full: true, mask);
1149	error = ovs_nla_copy_actions(net, attr: a, key: &masked_key, sfa: &acts, log);
1150	if (error) {
1151	OVS_NLERR(log,
1152	"Actions may not be safe on all matching packets");
1153	return ERR_PTR(error);
1154	}
1155
1156	return acts;
1157	}
1158
1159	/* Factor out match-init and action-copy to avoid
1160	* "Wframe-larger-than=1024" warning. Because mask is only
1161	* used to get actions, we new a function to save some
1162	* stack space.
1163	*
1164	* If there are not key and action attrs, we return 0
1165	* directly. In the case, the caller will also not use the
1166	* match as before. If there is action attr, we try to get
1167	* actions and save them to *acts. Before returning from
1168	* the function, we reset the match->mask pointer. Because
1169	* we should not to return match object with dangling reference
1170	* to mask.
1171	* */
1172	static noinline_for_stack int
1173	ovs_nla_init_match_and_action(struct net *net,
1174	struct sw_flow_match *match,
1175	struct sw_flow_key *key,
1176	struct nlattr **a,
1177	struct sw_flow_actions **acts,
1178	bool log)
1179	{
1180	struct sw_flow_mask mask;
1181	int error = 0;
1182
1183	if (a[OVS_FLOW_ATTR_KEY]) {
1184	ovs_match_init(match, key, reset_key: true, mask: &mask);
1185	error = ovs_nla_get_match(net, match, key: a[OVS_FLOW_ATTR_KEY],
1186	mask: a[OVS_FLOW_ATTR_MASK], log);
1187	if (error)
1188	goto error;
1189	}
1190
1191	if (a[OVS_FLOW_ATTR_ACTIONS]) {
1192	if (!a[OVS_FLOW_ATTR_KEY]) {
1193	OVS_NLERR(log,
1194	"Flow key attribute not present in set flow.");
1195	error = -EINVAL;
1196	goto error;
1197	}
1198
1199	*acts = get_flow_actions(net, a: a[OVS_FLOW_ATTR_ACTIONS], key,
1200	mask: &mask, log);
1201	if (IS_ERR(ptr: *acts)) {
1202	error = PTR_ERR(ptr: *acts);
1203	goto error;
1204	}
1205	}
1206
1207	/* On success, error is 0. */
1208	error:
1209	match->mask = NULL;
1210	return error;
1211	}
1212
1213	static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info)
1214	{
1215	struct net *net = sock_net(sk: skb->sk);
1216	struct nlattr **a = info->attrs;
1217	struct ovs_header *ovs_header = genl_info_userhdr(info);
1218	struct sw_flow_key key;
1219	struct sw_flow *flow;
1220	struct sk_buff *reply = NULL;
1221	struct datapath *dp;
1222	struct sw_flow_actions *old_acts = NULL, *acts = NULL;
1223	struct sw_flow_match match;
1224	struct sw_flow_id sfid;
1225	u32 ufid_flags = ovs_nla_get_ufid_flags(attr: a[OVS_FLOW_ATTR_UFID_FLAGS]);
1226	int error = 0;
1227	bool log = !a[OVS_FLOW_ATTR_PROBE];
1228	bool ufid_present;
1229
1230	ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log);
1231	if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) {
1232	OVS_NLERR(log,
1233	"Flow set message rejected, Key attribute missing.");
1234	return -EINVAL;
1235	}
1236
1237	error = ovs_nla_init_match_and_action(net, match: &match, key: &key, a,
1238	acts: &acts, log);
1239	if (error)
1240	goto error;
1241
1242	if (acts) {
1243	/* Can allocate before locking if have acts. */
1244	reply = ovs_flow_cmd_alloc_info(acts, sfid: &sfid, info, always: false,
1245	ufid_flags);
1246	if (IS_ERR(ptr: reply)) {
1247	error = PTR_ERR(ptr: reply);
1248	goto err_kfree_acts;
1249	}
1250	}
1251
1252	ovs_lock();
1253	dp = get_dp(net, dp_ifindex: ovs_header->dp_ifindex);
1254	if (unlikely(!dp)) {
1255	error = -ENODEV;
1256	goto err_unlock_ovs;
1257	}
1258	/* Check that the flow exists. */
1259	if (ufid_present)
1260	flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid);
1261	else
1262	flow = ovs_flow_tbl_lookup_exact(tbl: &dp->table, match: &match);
1263	if (unlikely(!flow)) {
1264	error = -ENOENT;
1265	goto err_unlock_ovs;
1266	}
1267
1268	/* Update actions, if present. */
1269	if (likely(acts)) {
1270	old_acts = ovsl_dereference(flow->sf_acts);
1271	rcu_assign_pointer(flow->sf_acts, acts);
1272
1273	if (unlikely(reply)) {
1274	error = ovs_flow_cmd_fill_info(flow,
1275	dp_ifindex: ovs_header->dp_ifindex,
1276	skb: reply, portid: info->snd_portid,
1277	seq: info->snd_seq, flags: 0,
1278	cmd: OVS_FLOW_CMD_SET,
1279	ufid_flags);
1280	BUG_ON(error < 0);
1281	}
1282	} else {
1283	/* Could not alloc without acts before locking. */
1284	reply = ovs_flow_cmd_build_info(flow, dp_ifindex: ovs_header->dp_ifindex,
1285	info, cmd: OVS_FLOW_CMD_SET, always: false,
1286	ufid_flags);
1287
1288	if (IS_ERR(ptr: reply)) {
1289	error = PTR_ERR(ptr: reply);
1290	goto err_unlock_ovs;
1291	}
1292	}
1293
1294	/* Clear stats. */
1295	if (a[OVS_FLOW_ATTR_CLEAR])
1296	ovs_flow_stats_clear(flow);
1297	ovs_unlock();
1298
1299	if (reply)
1300	ovs_notify(family: &dp_flow_genl_family, skb: reply, info);
1301	if (old_acts)
1302	ovs_nla_free_flow_actions_rcu(old_acts);
1303
1304	return 0;
1305
1306	err_unlock_ovs:
1307	ovs_unlock();
1308	kfree_skb(skb: reply);
1309	err_kfree_acts:
1310	ovs_nla_free_flow_actions(acts);
1311	error:
1312	return error;
1313	}
1314
1315	static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info)
1316	{
1317	struct nlattr **a = info->attrs;
1318	struct ovs_header *ovs_header = genl_info_userhdr(info);
1319	struct net *net = sock_net(sk: skb->sk);
1320	struct sw_flow_key key;
1321	struct sk_buff *reply;
1322	struct sw_flow *flow;
1323	struct datapath *dp;
1324	struct sw_flow_match match;
1325	struct sw_flow_id ufid;
1326	u32 ufid_flags = ovs_nla_get_ufid_flags(attr: a[OVS_FLOW_ATTR_UFID_FLAGS]);
1327	int err = 0;
1328	bool log = !a[OVS_FLOW_ATTR_PROBE];
1329	bool ufid_present;
1330
1331	ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1332	if (a[OVS_FLOW_ATTR_KEY]) {
1333	ovs_match_init(match: &match, key: &key, reset_key: true, NULL);
1334	err = ovs_nla_get_match(net, &match, key: a[OVS_FLOW_ATTR_KEY], NULL,
1335	log);
1336	} else if (!ufid_present) {
1337	OVS_NLERR(log,
1338	"Flow get message rejected, Key attribute missing.");
1339	err = -EINVAL;
1340	}
1341	if (err)
1342	return err;
1343
1344	ovs_lock();
1345	dp = get_dp(net: sock_net(sk: skb->sk), dp_ifindex: ovs_header->dp_ifindex);
1346	if (!dp) {
1347	err = -ENODEV;
1348	goto unlock;
1349	}
1350
1351	if (ufid_present)
1352	flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1353	else
1354	flow = ovs_flow_tbl_lookup_exact(tbl: &dp->table, match: &match);
1355	if (!flow) {
1356	err = -ENOENT;
1357	goto unlock;
1358	}
1359
1360	reply = ovs_flow_cmd_build_info(flow, dp_ifindex: ovs_header->dp_ifindex, info,
1361	cmd: OVS_FLOW_CMD_GET, always: true, ufid_flags);
1362	if (IS_ERR(ptr: reply)) {
1363	err = PTR_ERR(ptr: reply);
1364	goto unlock;
1365	}
1366
1367	ovs_unlock();
1368	return genlmsg_reply(skb: reply, info);
1369	unlock:
1370	ovs_unlock();
1371	return err;
1372	}
1373
1374	static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info)
1375	{
1376	struct nlattr **a = info->attrs;
1377	struct ovs_header *ovs_header = genl_info_userhdr(info);
1378	struct net *net = sock_net(sk: skb->sk);
1379	struct sw_flow_key key;
1380	struct sk_buff *reply;
1381	struct sw_flow *flow = NULL;
1382	struct datapath *dp;
1383	struct sw_flow_match match;
1384	struct sw_flow_id ufid;
1385	u32 ufid_flags = ovs_nla_get_ufid_flags(attr: a[OVS_FLOW_ATTR_UFID_FLAGS]);
1386	int err;
1387	bool log = !a[OVS_FLOW_ATTR_PROBE];
1388	bool ufid_present;
1389
1390	ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log);
1391	if (a[OVS_FLOW_ATTR_KEY]) {
1392	ovs_match_init(match: &match, key: &key, reset_key: true, NULL);
1393	err = ovs_nla_get_match(net, &match, key: a[OVS_FLOW_ATTR_KEY],
1394	NULL, log);
1395	if (unlikely(err))
1396	return err;
1397	}
1398
1399	ovs_lock();
1400	dp = get_dp(net: sock_net(sk: skb->sk), dp_ifindex: ovs_header->dp_ifindex);
1401	if (unlikely(!dp)) {
1402	err = -ENODEV;
1403	goto unlock;
1404	}
1405
1406	if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) {
1407	err = ovs_flow_tbl_flush(flow_table: &dp->table);
1408	goto unlock;
1409	}
1410
1411	if (ufid_present)
1412	flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid);
1413	else
1414	flow = ovs_flow_tbl_lookup_exact(tbl: &dp->table, match: &match);
1415	if (unlikely(!flow)) {
1416	err = -ENOENT;
1417	goto unlock;
1418	}
1419
1420	ovs_flow_tbl_remove(table: &dp->table, flow);
1421	ovs_unlock();
1422
1423	reply = ovs_flow_cmd_alloc_info(acts: (const struct sw_flow_actions __force *) flow->sf_acts,
1424	sfid: &flow->id, info, always: false, ufid_flags);
1425	if (likely(reply)) {
1426	if (!IS_ERR(ptr: reply)) {
1427	rcu_read_lock(); /*To keep RCU checker happy. */
1428	err = ovs_flow_cmd_fill_info(flow, dp_ifindex: ovs_header->dp_ifindex,
1429	skb: reply, portid: info->snd_portid,
1430	seq: info->snd_seq, flags: 0,
1431	cmd: OVS_FLOW_CMD_DEL,
1432	ufid_flags);
1433	rcu_read_unlock();
1434	if (WARN_ON_ONCE(err < 0)) {
1435	kfree_skb(skb: reply);
1436	goto out_free;
1437	}
1438
1439	ovs_notify(family: &dp_flow_genl_family, skb: reply, info);
1440	} else {
1441	netlink_set_err(ssk: sock_net(sk: skb->sk)->genl_sock, portid: 0, group: 0,
1442	code: PTR_ERR(ptr: reply));
1443	}
1444	}
1445
1446	out_free:
1447	ovs_flow_free(flow, deferred: true);
1448	return 0;
1449	unlock:
1450	ovs_unlock();
1451	return err;
1452	}
1453
1454	static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
1455	{
1456	struct nlattr *a[__OVS_FLOW_ATTR_MAX];
1457	struct ovs_header *ovs_header = genlmsg_data(gnlh: nlmsg_data(nlh: cb->nlh));
1458	struct table_instance *ti;
1459	struct datapath *dp;
1460	u32 ufid_flags;
1461	int err;
1462
1463	err = genlmsg_parse_deprecated(nlh: cb->nlh, family: &dp_flow_genl_family, tb: a,
1464	OVS_FLOW_ATTR_MAX, policy: flow_policy, NULL);
1465	if (err)
1466	return err;
1467	ufid_flags = ovs_nla_get_ufid_flags(attr: a[OVS_FLOW_ATTR_UFID_FLAGS]);
1468
1469	rcu_read_lock();
1470	dp = get_dp_rcu(net: sock_net(sk: skb->sk), dp_ifindex: ovs_header->dp_ifindex);
1471	if (!dp) {
1472	rcu_read_unlock();
1473	return -ENODEV;
1474	}
1475
1476	ti = rcu_dereference(dp->table.ti);
1477	for (;;) {
1478	struct sw_flow *flow;
1479	u32 bucket, obj;
1480
1481	bucket = cb->args[0];
1482	obj = cb->args[1];
1483	flow = ovs_flow_tbl_dump_next(table: ti, bucket: &bucket, idx: &obj);
1484	if (!flow)
1485	break;
1486
1487	if (ovs_flow_cmd_fill_info(flow, dp_ifindex: ovs_header->dp_ifindex, skb,
1488	NETLINK_CB(cb->skb).portid,
1489	seq: cb->nlh->nlmsg_seq, NLM_F_MULTI,
1490	cmd: OVS_FLOW_CMD_GET, ufid_flags) < 0)
1491	break;
1492
1493	cb->args[0] = bucket;
1494	cb->args[1] = obj;
1495	}
1496	rcu_read_unlock();
1497	return skb->len;
1498	}
1499
1500	static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = {
1501	[OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED },
1502	[OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED },
1503	[OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED },
1504	[OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG },
1505	[OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG },
1506	[OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 },
1507	[OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 },
1508	};
1509
1510	static const struct genl_small_ops dp_flow_genl_ops[] = {
1511	{ .cmd = OVS_FLOW_CMD_NEW,
1512	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1513	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1514	.doit = ovs_flow_cmd_new
1515	},
1516	{ .cmd = OVS_FLOW_CMD_DEL,
1517	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1518	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1519	.doit = ovs_flow_cmd_del
1520	},
1521	{ .cmd = OVS_FLOW_CMD_GET,
1522	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1523	.flags = 0, /* OK for unprivileged users. */
1524	.doit = ovs_flow_cmd_get,
1525	.dumpit = ovs_flow_cmd_dump
1526	},
1527	{ .cmd = OVS_FLOW_CMD_SET,
1528	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
1529	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
1530	.doit = ovs_flow_cmd_set,
1531	},
1532	};
1533
1534	static struct genl_family dp_flow_genl_family __ro_after_init = {
1535	.hdrsize = sizeof(struct ovs_header),
1536	.name = OVS_FLOW_FAMILY,
1537	.version = OVS_FLOW_VERSION,
1538	.maxattr = OVS_FLOW_ATTR_MAX,
1539	.policy = flow_policy,
1540	.netnsok = true,
1541	.parallel_ops = true,
1542	.small_ops = dp_flow_genl_ops,
1543	.n_small_ops = ARRAY_SIZE(dp_flow_genl_ops),
1544	.resv_start_op = OVS_FLOW_CMD_SET + 1,
1545	.mcgrps = &ovs_dp_flow_multicast_group,
1546	.n_mcgrps = 1,
1547	.module = THIS_MODULE,
1548	};
1549
1550	static size_t ovs_dp_cmd_msg_size(void)
1551	{
1552	size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header));
1553
1554	msgsize += nla_total_size(IFNAMSIZ);
1555	msgsize += nla_total_size_64bit(payload: sizeof(struct ovs_dp_stats));
1556	msgsize += nla_total_size_64bit(payload: sizeof(struct ovs_dp_megaflow_stats));
1557	msgsize += nla_total_size(payload: sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */
1558	msgsize += nla_total_size(payload: sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */
1559	msgsize += nla_total_size(payload: sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */
1560
1561	return msgsize;
1562	}
1563
1564	/* Called with ovs_mutex. */
1565	static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb,
1566	u32 portid, u32 seq, u32 flags, u8 cmd)
1567	{
1568	struct ovs_header *ovs_header;
1569	struct ovs_dp_stats dp_stats;
1570	struct ovs_dp_megaflow_stats dp_megaflow_stats;
1571	struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids);
1572	int err, pids_len;
1573
1574	ovs_header = genlmsg_put(skb, portid, seq, family: &dp_datapath_genl_family,
1575	flags, cmd);
1576	if (!ovs_header)
1577	goto error;
1578
1579	ovs_header->dp_ifindex = get_dpifindex(dp);
1580
1581	err = nla_put_string(skb, attrtype: OVS_DP_ATTR_NAME, str: ovs_dp_name(dp));
1582	if (err)
1583	goto nla_put_failure;
1584
1585	get_dp_stats(dp, stats: &dp_stats, mega_stats: &dp_megaflow_stats);
1586	if (nla_put_64bit(skb, attrtype: OVS_DP_ATTR_STATS, attrlen: sizeof(struct ovs_dp_stats),
1587	data: &dp_stats, padattr: OVS_DP_ATTR_PAD))
1588	goto nla_put_failure;
1589
1590	if (nla_put_64bit(skb, attrtype: OVS_DP_ATTR_MEGAFLOW_STATS,
1591	attrlen: sizeof(struct ovs_dp_megaflow_stats),
1592	data: &dp_megaflow_stats, padattr: OVS_DP_ATTR_PAD))
1593	goto nla_put_failure;
1594
1595	if (nla_put_u32(skb, attrtype: OVS_DP_ATTR_USER_FEATURES, value: dp->user_features))
1596	goto nla_put_failure;
1597
1598	if (nla_put_u32(skb, attrtype: OVS_DP_ATTR_MASKS_CACHE_SIZE,
1599	value: ovs_flow_tbl_masks_cache_size(table: &dp->table)))
1600	goto nla_put_failure;
1601
1602	if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) {
1603	pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32);
1604	if (nla_put(skb, attrtype: OVS_DP_ATTR_PER_CPU_PIDS, attrlen: pids_len, data: &pids->pids))
1605	goto nla_put_failure;
1606	}
1607
1608	genlmsg_end(skb, hdr: ovs_header);
1609	return 0;
1610
1611	nla_put_failure:
1612	genlmsg_cancel(skb, hdr: ovs_header);
1613	error:
1614	return -EMSGSIZE;
1615	}
1616
1617	static struct sk_buff *ovs_dp_cmd_alloc_info(void)
1618	{
1619	return genlmsg_new(payload: ovs_dp_cmd_msg_size(), GFP_KERNEL);
1620	}
1621
1622	/* Called with rcu_read_lock or ovs_mutex. */
1623	static struct datapath *lookup_datapath(struct net *net,
1624	const struct ovs_header *ovs_header,
1625	struct nlattr *a[OVS_DP_ATTR_MAX + 1])
1626	{
1627	struct datapath *dp;
1628
1629	if (!a[OVS_DP_ATTR_NAME])
1630	dp = get_dp(net, dp_ifindex: ovs_header->dp_ifindex);
1631	else {
1632	struct vport *vport;
1633
1634	vport = ovs_vport_locate(net, name: nla_data(nla: a[OVS_DP_ATTR_NAME]));
1635	dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL;
1636	}
1637	return dp ? dp : ERR_PTR(error: -ENODEV);
1638	}
1639
1640	static void ovs_dp_reset_user_features(struct sk_buff *skb,
1641	struct genl_info *info)
1642	{
1643	struct datapath *dp;
1644
1645	dp = lookup_datapath(net: sock_net(sk: skb->sk), ovs_header: genl_info_userhdr(info),
1646	a: info->attrs);
1647	if (IS_ERR(ptr: dp))
1648	return;
1649
1650	pr_warn("%s: Dropping previously announced user features\n",
1651	ovs_dp_name(dp));
1652	dp->user_features = 0;
1653	}
1654
1655	static int ovs_dp_set_upcall_portids(struct datapath *dp,
1656	const struct nlattr *ids)
1657	{
1658	struct dp_nlsk_pids *old, *dp_nlsk_pids;
1659
1660	if (!nla_len(nla: ids) || nla_len(nla: ids) % sizeof(u32))
1661	return -EINVAL;
1662
1663	old = ovsl_dereference(dp->upcall_portids);
1664
1665	dp_nlsk_pids = kmalloc(size: sizeof(*dp_nlsk_pids) + nla_len(nla: ids),
1666	GFP_KERNEL);
1667	if (!dp_nlsk_pids)
1668	return -ENOMEM;
1669
1670	dp_nlsk_pids->n_pids = nla_len(nla: ids) / sizeof(u32);
1671	nla_memcpy(dest: dp_nlsk_pids->pids, src: ids, count: nla_len(nla: ids));
1672
1673	rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids);
1674
1675	kfree_rcu(old, rcu);
1676
1677	return 0;
1678	}
1679
1680	u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id)
1681	{
1682	struct dp_nlsk_pids *dp_nlsk_pids;
1683
1684	dp_nlsk_pids = rcu_dereference(dp->upcall_portids);
1685
1686	if (dp_nlsk_pids) {
1687	if (cpu_id < dp_nlsk_pids->n_pids) {
1688	return dp_nlsk_pids->pids[cpu_id];
1689	} else if (dp_nlsk_pids->n_pids > 0 &&
1690	cpu_id >= dp_nlsk_pids->n_pids) {
1691	/* If the number of netlink PIDs is mismatched with
1692	* the number of CPUs as seen by the kernel, log this
1693	* and send the upcall to an arbitrary socket (0) in
1694	* order to not drop packets
1695	*/
1696	pr_info_ratelimited("cpu_id mismatch with handler threads");
1697	return dp_nlsk_pids->pids[cpu_id %
1698	dp_nlsk_pids->n_pids];
1699	} else {
1700	return 0;
1701	}
1702	} else {
1703	return 0;
1704	}
1705	}
1706
1707	static int ovs_dp_change(struct datapath *dp, struct nlattr *a[])
1708	{
1709	u32 user_features = 0, old_features = dp->user_features;
1710	int err;
1711
1712	if (a[OVS_DP_ATTR_USER_FEATURES]) {
1713	user_features = nla_get_u32(nla: a[OVS_DP_ATTR_USER_FEATURES]);
1714
1715	if (user_features & ~(OVS_DP_F_VPORT_PIDS |
1716	OVS_DP_F_UNALIGNED |
1717	OVS_DP_F_TC_RECIRC_SHARING |
1718	OVS_DP_F_DISPATCH_UPCALL_PER_CPU))
1719	return -EOPNOTSUPP;
1720
1721	#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1722	if (user_features & OVS_DP_F_TC_RECIRC_SHARING)
1723	return -EOPNOTSUPP;
1724	#endif
1725	}
1726
1727	if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) {
1728	int err;
1729	u32 cache_size;
1730
1731	cache_size = nla_get_u32(nla: a[OVS_DP_ATTR_MASKS_CACHE_SIZE]);
1732	err = ovs_flow_tbl_masks_cache_resize(table: &dp->table, size: cache_size);
1733	if (err)
1734	return err;
1735	}
1736
1737	dp->user_features = user_features;
1738
1739	if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU &&
1740	a[OVS_DP_ATTR_PER_CPU_PIDS]) {
1741	/* Upcall Netlink Port IDs have been updated */
1742	err = ovs_dp_set_upcall_portids(dp,
1743	ids: a[OVS_DP_ATTR_PER_CPU_PIDS]);
1744	if (err)
1745	return err;
1746	}
1747
1748	if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1749	!(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1750	tc_skb_ext_tc_enable();
1751	else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) &&
1752	(old_features & OVS_DP_F_TC_RECIRC_SHARING))
1753	tc_skb_ext_tc_disable();
1754
1755	return 0;
1756	}
1757
1758	static int ovs_dp_stats_init(struct datapath *dp)
1759	{
1760	dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu);
1761	if (!dp->stats_percpu)
1762	return -ENOMEM;
1763
1764	return 0;
1765	}
1766
1767	static int ovs_dp_vport_init(struct datapath *dp)
1768	{
1769	int i;
1770
1771	dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS,
1772	size: sizeof(struct hlist_head),
1773	GFP_KERNEL);
1774	if (!dp->ports)
1775	return -ENOMEM;
1776
1777	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++)
1778	INIT_HLIST_HEAD(&dp->ports[i]);
1779
1780	return 0;
1781	}
1782
1783	static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info)
1784	{
1785	struct nlattr **a = info->attrs;
1786	struct vport_parms parms;
1787	struct sk_buff *reply;
1788	struct datapath *dp;
1789	struct vport *vport;
1790	struct ovs_net *ovs_net;
1791	int err;
1792
1793	err = -EINVAL;
1794	if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID])
1795	goto err;
1796
1797	reply = ovs_dp_cmd_alloc_info();
1798	if (!reply)
1799	return -ENOMEM;
1800
1801	err = -ENOMEM;
1802	dp = kzalloc(size: sizeof(*dp), GFP_KERNEL);
1803	if (dp == NULL)
1804	goto err_destroy_reply;
1805
1806	ovs_dp_set_net(dp, net: sock_net(sk: skb->sk));
1807
1808	/* Allocate table. */
1809	err = ovs_flow_tbl_init(&dp->table);
1810	if (err)
1811	goto err_destroy_dp;
1812
1813	err = ovs_dp_stats_init(dp);
1814	if (err)
1815	goto err_destroy_table;
1816
1817	err = ovs_dp_vport_init(dp);
1818	if (err)
1819	goto err_destroy_stats;
1820
1821	err = ovs_meters_init(dp);
1822	if (err)
1823	goto err_destroy_ports;
1824
1825	/* Set up our datapath device. */
1826	parms.name = nla_data(nla: a[OVS_DP_ATTR_NAME]);
1827	parms.type = OVS_VPORT_TYPE_INTERNAL;
1828	parms.options = NULL;
1829	parms.dp = dp;
1830	parms.port_no = OVSP_LOCAL;
1831	parms.upcall_portids = a[OVS_DP_ATTR_UPCALL_PID];
1832	parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX]
1833	? nla_get_s32(nla: a[OVS_DP_ATTR_IFINDEX]) : 0;
1834
1835	/* So far only local changes have been made, now need the lock. */
1836	ovs_lock();
1837
1838	err = ovs_dp_change(dp, a);
1839	if (err)
1840	goto err_unlock_and_destroy_meters;
1841
1842	vport = new_vport(parms: &parms);
1843	if (IS_ERR(ptr: vport)) {
1844	err = PTR_ERR(ptr: vport);
1845	if (err == -EBUSY)
1846	err = -EEXIST;
1847
1848	if (err == -EEXIST) {
1849	/* An outdated user space instance that does not understand
1850	* the concept of user_features has attempted to create a new
1851	* datapath and is likely to reuse it. Drop all user features.
1852	*/
1853	if (info->genlhdr->version < OVS_DP_VER_FEATURES)
1854	ovs_dp_reset_user_features(skb, info);
1855	}
1856
1857	goto err_destroy_portids;
1858	}
1859
1860	err = ovs_dp_cmd_fill_info(dp, skb: reply, portid: info->snd_portid,
1861	seq: info->snd_seq, flags: 0, cmd: OVS_DP_CMD_NEW);
1862	BUG_ON(err < 0);
1863
1864	ovs_net = net_generic(net: ovs_dp_get_net(dp), id: ovs_net_id);
1865	list_add_tail_rcu(new: &dp->list_node, head: &ovs_net->dps);
1866
1867	ovs_unlock();
1868
1869	ovs_notify(family: &dp_datapath_genl_family, skb: reply, info);
1870	return 0;
1871
1872	err_destroy_portids:
1873	kfree(rcu_dereference_raw(dp->upcall_portids));
1874	err_unlock_and_destroy_meters:
1875	ovs_unlock();
1876	ovs_meters_exit(dp);
1877	err_destroy_ports:
1878	kfree(objp: dp->ports);
1879	err_destroy_stats:
1880	free_percpu(pdata: dp->stats_percpu);
1881	err_destroy_table:
1882	ovs_flow_tbl_destroy(table: &dp->table);
1883	err_destroy_dp:
1884	kfree(objp: dp);
1885	err_destroy_reply:
1886	kfree_skb(skb: reply);
1887	err:
1888	return err;
1889	}
1890
1891	/* Called with ovs_mutex. */
1892	static void __dp_destroy(struct datapath *dp)
1893	{
1894	struct flow_table *table = &dp->table;
1895	int i;
1896
1897	if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING)
1898	tc_skb_ext_tc_disable();
1899
1900	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
1901	struct vport *vport;
1902	struct hlist_node *n;
1903
1904	hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node)
1905	if (vport->port_no != OVSP_LOCAL)
1906	ovs_dp_detach_port(p: vport);
1907	}
1908
1909	list_del_rcu(entry: &dp->list_node);
1910
1911	/* OVSP_LOCAL is datapath internal port. We need to make sure that
1912	* all ports in datapath are destroyed first before freeing datapath.
1913	*/
1914	ovs_dp_detach_port(p: ovs_vport_ovsl(dp, OVSP_LOCAL));
1915
1916	/* Flush sw_flow in the tables. RCU cb only releases resource
1917	* such as dp, ports and tables. That may avoid some issues
1918	* such as RCU usage warning.
1919	*/
1920	table_instance_flow_flush(table, ovsl_dereference(table->ti),
1921	ovsl_dereference(table->ufid_ti));
1922
1923	/* RCU destroy the ports, meters and flow tables. */
1924	call_rcu(head: &dp->rcu, func: destroy_dp_rcu);
1925	}
1926
1927	static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info)
1928	{
1929	struct sk_buff *reply;
1930	struct datapath *dp;
1931	int err;
1932
1933	reply = ovs_dp_cmd_alloc_info();
1934	if (!reply)
1935	return -ENOMEM;
1936
1937	ovs_lock();
1938	dp = lookup_datapath(net: sock_net(sk: skb->sk), ovs_header: genl_info_userhdr(info),
1939	a: info->attrs);
1940	err = PTR_ERR(ptr: dp);
1941	if (IS_ERR(ptr: dp))
1942	goto err_unlock_free;
1943
1944	err = ovs_dp_cmd_fill_info(dp, skb: reply, portid: info->snd_portid,
1945	seq: info->snd_seq, flags: 0, cmd: OVS_DP_CMD_DEL);
1946	BUG_ON(err < 0);
1947
1948	__dp_destroy(dp);
1949	ovs_unlock();
1950
1951	ovs_notify(family: &dp_datapath_genl_family, skb: reply, info);
1952
1953	return 0;
1954
1955	err_unlock_free:
1956	ovs_unlock();
1957	kfree_skb(skb: reply);
1958	return err;
1959	}
1960
1961	static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info)
1962	{
1963	struct sk_buff *reply;
1964	struct datapath *dp;
1965	int err;
1966
1967	reply = ovs_dp_cmd_alloc_info();
1968	if (!reply)
1969	return -ENOMEM;
1970
1971	ovs_lock();
1972	dp = lookup_datapath(net: sock_net(sk: skb->sk), ovs_header: genl_info_userhdr(info),
1973	a: info->attrs);
1974	err = PTR_ERR(ptr: dp);
1975	if (IS_ERR(ptr: dp))
1976	goto err_unlock_free;
1977
1978	err = ovs_dp_change(dp, a: info->attrs);
1979	if (err)
1980	goto err_unlock_free;
1981
1982	err = ovs_dp_cmd_fill_info(dp, skb: reply, portid: info->snd_portid,
1983	seq: info->snd_seq, flags: 0, cmd: OVS_DP_CMD_SET);
1984	BUG_ON(err < 0);
1985
1986	ovs_unlock();
1987	ovs_notify(family: &dp_datapath_genl_family, skb: reply, info);
1988
1989	return 0;
1990
1991	err_unlock_free:
1992	ovs_unlock();
1993	kfree_skb(skb: reply);
1994	return err;
1995	}
1996
1997	static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info)
1998	{
1999	struct sk_buff *reply;
2000	struct datapath *dp;
2001	int err;
2002
2003	reply = ovs_dp_cmd_alloc_info();
2004	if (!reply)
2005	return -ENOMEM;
2006
2007	ovs_lock();
2008	dp = lookup_datapath(net: sock_net(sk: skb->sk), ovs_header: genl_info_userhdr(info),
2009	a: info->attrs);
2010	if (IS_ERR(ptr: dp)) {
2011	err = PTR_ERR(ptr: dp);
2012	goto err_unlock_free;
2013	}
2014	err = ovs_dp_cmd_fill_info(dp, skb: reply, portid: info->snd_portid,
2015	seq: info->snd_seq, flags: 0, cmd: OVS_DP_CMD_GET);
2016	BUG_ON(err < 0);
2017	ovs_unlock();
2018
2019	return genlmsg_reply(skb: reply, info);
2020
2021	err_unlock_free:
2022	ovs_unlock();
2023	kfree_skb(skb: reply);
2024	return err;
2025	}
2026
2027	static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2028	{
2029	struct ovs_net *ovs_net = net_generic(net: sock_net(sk: skb->sk), id: ovs_net_id);
2030	struct datapath *dp;
2031	int skip = cb->args[0];
2032	int i = 0;
2033
2034	ovs_lock();
2035	list_for_each_entry(dp, &ovs_net->dps, list_node) {
2036	if (i >= skip &&
2037	ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid,
2038	seq: cb->nlh->nlmsg_seq, NLM_F_MULTI,
2039	cmd: OVS_DP_CMD_GET) < 0)
2040	break;
2041	i++;
2042	}
2043	ovs_unlock();
2044
2045	cb->args[0] = i;
2046
2047	return skb->len;
2048	}
2049
2050	static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = {
2051	[OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2052	[OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 },
2053	[OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 },
2054	[OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0,
2055	PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)),
2056	[OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2057	};
2058
2059	static const struct genl_small_ops dp_datapath_genl_ops[] = {
2060	{ .cmd = OVS_DP_CMD_NEW,
2061	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2062	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2063	.doit = ovs_dp_cmd_new
2064	},
2065	{ .cmd = OVS_DP_CMD_DEL,
2066	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2067	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2068	.doit = ovs_dp_cmd_del
2069	},
2070	{ .cmd = OVS_DP_CMD_GET,
2071	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2072	.flags = 0, /* OK for unprivileged users. */
2073	.doit = ovs_dp_cmd_get,
2074	.dumpit = ovs_dp_cmd_dump
2075	},
2076	{ .cmd = OVS_DP_CMD_SET,
2077	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2078	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2079	.doit = ovs_dp_cmd_set,
2080	},
2081	};
2082
2083	static struct genl_family dp_datapath_genl_family __ro_after_init = {
2084	.hdrsize = sizeof(struct ovs_header),
2085	.name = OVS_DATAPATH_FAMILY,
2086	.version = OVS_DATAPATH_VERSION,
2087	.maxattr = OVS_DP_ATTR_MAX,
2088	.policy = datapath_policy,
2089	.netnsok = true,
2090	.parallel_ops = true,
2091	.small_ops = dp_datapath_genl_ops,
2092	.n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops),
2093	.resv_start_op = OVS_DP_CMD_SET + 1,
2094	.mcgrps = &ovs_dp_datapath_multicast_group,
2095	.n_mcgrps = 1,
2096	.module = THIS_MODULE,
2097	};
2098
2099	/* Called with ovs_mutex or RCU read lock. */
2100	static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb,
2101	struct net *net, u32 portid, u32 seq,
2102	u32 flags, u8 cmd, gfp_t gfp)
2103	{
2104	struct ovs_header *ovs_header;
2105	struct ovs_vport_stats vport_stats;
2106	int err;
2107
2108	ovs_header = genlmsg_put(skb, portid, seq, family: &dp_vport_genl_family,
2109	flags, cmd);
2110	if (!ovs_header)
2111	return -EMSGSIZE;
2112
2113	ovs_header->dp_ifindex = get_dpifindex(dp: vport->dp);
2114
2115	if (nla_put_u32(skb, attrtype: OVS_VPORT_ATTR_PORT_NO, value: vport->port_no) ||
2116	nla_put_u32(skb, attrtype: OVS_VPORT_ATTR_TYPE, value: vport->ops->type) ||
2117	nla_put_string(skb, attrtype: OVS_VPORT_ATTR_NAME,
2118	str: ovs_vport_name(vport)) ||
2119	nla_put_u32(skb, attrtype: OVS_VPORT_ATTR_IFINDEX, value: vport->dev->ifindex))
2120	goto nla_put_failure;
2121
2122	if (!net_eq(net1: net, net2: dev_net(dev: vport->dev))) {
2123	int id = peernet2id_alloc(net, peer: dev_net(dev: vport->dev), gfp);
2124
2125	if (nla_put_s32(skb, attrtype: OVS_VPORT_ATTR_NETNSID, value: id))
2126	goto nla_put_failure;
2127	}
2128
2129	ovs_vport_get_stats(vport, &vport_stats);
2130	if (nla_put_64bit(skb, attrtype: OVS_VPORT_ATTR_STATS,
2131	attrlen: sizeof(struct ovs_vport_stats), data: &vport_stats,
2132	padattr: OVS_VPORT_ATTR_PAD))
2133	goto nla_put_failure;
2134
2135	if (ovs_vport_get_upcall_stats(vport, skb))
2136	goto nla_put_failure;
2137
2138	if (ovs_vport_get_upcall_portids(vport, skb))
2139	goto nla_put_failure;
2140
2141	err = ovs_vport_get_options(vport, skb);
2142	if (err == -EMSGSIZE)
2143	goto error;
2144
2145	genlmsg_end(skb, hdr: ovs_header);
2146	return 0;
2147
2148	nla_put_failure:
2149	err = -EMSGSIZE;
2150	error:
2151	genlmsg_cancel(skb, hdr: ovs_header);
2152	return err;
2153	}
2154
2155	static struct sk_buff *ovs_vport_cmd_alloc_info(void)
2156	{
2157	return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2158	}
2159
2160	/* Called with ovs_mutex, only via ovs_dp_notify_wq(). */
2161	struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, struct net *net,
2162	u32 portid, u32 seq, u8 cmd)
2163	{
2164	struct sk_buff *skb;
2165	int retval;
2166
2167	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
2168	if (!skb)
2169	return ERR_PTR(error: -ENOMEM);
2170
2171	retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, flags: 0, cmd,
2172	GFP_KERNEL);
2173	BUG_ON(retval < 0);
2174
2175	return skb;
2176	}
2177
2178	/* Called with ovs_mutex or RCU read lock. */
2179	static struct vport *lookup_vport(struct net *net,
2180	const struct ovs_header *ovs_header,
2181	struct nlattr *a[OVS_VPORT_ATTR_MAX + 1])
2182	{
2183	struct datapath *dp;
2184	struct vport *vport;
2185
2186	if (a[OVS_VPORT_ATTR_IFINDEX])
2187	return ERR_PTR(error: -EOPNOTSUPP);
2188	if (a[OVS_VPORT_ATTR_NAME]) {
2189	vport = ovs_vport_locate(net, name: nla_data(nla: a[OVS_VPORT_ATTR_NAME]));
2190	if (!vport)
2191	return ERR_PTR(error: -ENODEV);
2192	if (ovs_header->dp_ifindex &&
2193	ovs_header->dp_ifindex != get_dpifindex(dp: vport->dp))
2194	return ERR_PTR(error: -ENODEV);
2195	return vport;
2196	} else if (a[OVS_VPORT_ATTR_PORT_NO]) {
2197	u32 port_no = nla_get_u32(nla: a[OVS_VPORT_ATTR_PORT_NO]);
2198
2199	if (port_no >= DP_MAX_PORTS)
2200	return ERR_PTR(error: -EFBIG);
2201
2202	dp = get_dp(net, dp_ifindex: ovs_header->dp_ifindex);
2203	if (!dp)
2204	return ERR_PTR(error: -ENODEV);
2205
2206	vport = ovs_vport_ovsl_rcu(dp, port_no);
2207	if (!vport)
2208	return ERR_PTR(error: -ENODEV);
2209	return vport;
2210	} else
2211	return ERR_PTR(error: -EINVAL);
2212
2213	}
2214
2215	static unsigned int ovs_get_max_headroom(struct datapath *dp)
2216	{
2217	unsigned int dev_headroom, max_headroom = 0;
2218	struct net_device *dev;
2219	struct vport *vport;
2220	int i;
2221
2222	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2223	hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2224	lockdep_ovsl_is_held()) {
2225	dev = vport->dev;
2226	dev_headroom = netdev_get_fwd_headroom(dev);
2227	if (dev_headroom > max_headroom)
2228	max_headroom = dev_headroom;
2229	}
2230	}
2231
2232	return max_headroom;
2233	}
2234
2235	/* Called with ovs_mutex */
2236	static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom)
2237	{
2238	struct vport *vport;
2239	int i;
2240
2241	dp->max_headroom = new_headroom;
2242	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2243	hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node,
2244	lockdep_ovsl_is_held())
2245	netdev_set_rx_headroom(dev: vport->dev, new_hr: new_headroom);
2246	}
2247	}
2248
2249	static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info)
2250	{
2251	struct nlattr **a = info->attrs;
2252	struct ovs_header *ovs_header = genl_info_userhdr(info);
2253	struct vport_parms parms;
2254	struct sk_buff *reply;
2255	struct vport *vport;
2256	struct datapath *dp;
2257	unsigned int new_headroom;
2258	u32 port_no;
2259	int err;
2260
2261	if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] ||
2262	!a[OVS_VPORT_ATTR_UPCALL_PID])
2263	return -EINVAL;
2264
2265	parms.type = nla_get_u32(nla: a[OVS_VPORT_ATTR_TYPE]);
2266
2267	if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL)
2268	return -EOPNOTSUPP;
2269
2270	port_no = a[OVS_VPORT_ATTR_PORT_NO]
2271	? nla_get_u32(nla: a[OVS_VPORT_ATTR_PORT_NO]) : 0;
2272	if (port_no >= DP_MAX_PORTS)
2273	return -EFBIG;
2274
2275	reply = ovs_vport_cmd_alloc_info();
2276	if (!reply)
2277	return -ENOMEM;
2278
2279	ovs_lock();
2280	restart:
2281	dp = get_dp(net: sock_net(sk: skb->sk), dp_ifindex: ovs_header->dp_ifindex);
2282	err = -ENODEV;
2283	if (!dp)
2284	goto exit_unlock_free;
2285
2286	if (port_no) {
2287	vport = ovs_vport_ovsl(dp, port_no);
2288	err = -EBUSY;
2289	if (vport)
2290	goto exit_unlock_free;
2291	} else {
2292	for (port_no = 1; ; port_no++) {
2293	if (port_no >= DP_MAX_PORTS) {
2294	err = -EFBIG;
2295	goto exit_unlock_free;
2296	}
2297	vport = ovs_vport_ovsl(dp, port_no);
2298	if (!vport)
2299	break;
2300	}
2301	}
2302
2303	parms.name = nla_data(nla: a[OVS_VPORT_ATTR_NAME]);
2304	parms.options = a[OVS_VPORT_ATTR_OPTIONS];
2305	parms.dp = dp;
2306	parms.port_no = port_no;
2307	parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID];
2308	parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX]
2309	? nla_get_s32(nla: a[OVS_VPORT_ATTR_IFINDEX]) : 0;
2310
2311	vport = new_vport(parms: &parms);
2312	err = PTR_ERR(ptr: vport);
2313	if (IS_ERR(ptr: vport)) {
2314	if (err == -EAGAIN)
2315	goto restart;
2316	goto exit_unlock_free;
2317	}
2318
2319	err = ovs_vport_cmd_fill_info(vport, skb: reply, net: genl_info_net(info),
2320	portid: info->snd_portid, seq: info->snd_seq, flags: 0,
2321	cmd: OVS_VPORT_CMD_NEW, GFP_KERNEL);
2322
2323	new_headroom = netdev_get_fwd_headroom(dev: vport->dev);
2324
2325	if (new_headroom > dp->max_headroom)
2326	ovs_update_headroom(dp, new_headroom);
2327	else
2328	netdev_set_rx_headroom(dev: vport->dev, new_hr: dp->max_headroom);
2329
2330	BUG_ON(err < 0);
2331	ovs_unlock();
2332
2333	ovs_notify(family: &dp_vport_genl_family, skb: reply, info);
2334	return 0;
2335
2336	exit_unlock_free:
2337	ovs_unlock();
2338	kfree_skb(skb: reply);
2339	return err;
2340	}
2341
2342	static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info)
2343	{
2344	struct nlattr **a = info->attrs;
2345	struct sk_buff *reply;
2346	struct vport *vport;
2347	int err;
2348
2349	reply = ovs_vport_cmd_alloc_info();
2350	if (!reply)
2351	return -ENOMEM;
2352
2353	ovs_lock();
2354	vport = lookup_vport(net: sock_net(sk: skb->sk), ovs_header: genl_info_userhdr(info), a);
2355	err = PTR_ERR(ptr: vport);
2356	if (IS_ERR(ptr: vport))
2357	goto exit_unlock_free;
2358
2359	if (a[OVS_VPORT_ATTR_TYPE] &&
2360	nla_get_u32(nla: a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) {
2361	err = -EINVAL;
2362	goto exit_unlock_free;
2363	}
2364
2365	if (a[OVS_VPORT_ATTR_OPTIONS]) {
2366	err = ovs_vport_set_options(vport, options: a[OVS_VPORT_ATTR_OPTIONS]);
2367	if (err)
2368	goto exit_unlock_free;
2369	}
2370
2371
2372	if (a[OVS_VPORT_ATTR_UPCALL_PID]) {
2373	struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID];
2374
2375	err = ovs_vport_set_upcall_portids(vport, pids: ids);
2376	if (err)
2377	goto exit_unlock_free;
2378	}
2379
2380	err = ovs_vport_cmd_fill_info(vport, skb: reply, net: genl_info_net(info),
2381	portid: info->snd_portid, seq: info->snd_seq, flags: 0,
2382	cmd: OVS_VPORT_CMD_SET, GFP_KERNEL);
2383	BUG_ON(err < 0);
2384
2385	ovs_unlock();
2386	ovs_notify(family: &dp_vport_genl_family, skb: reply, info);
2387	return 0;
2388
2389	exit_unlock_free:
2390	ovs_unlock();
2391	kfree_skb(skb: reply);
2392	return err;
2393	}
2394
2395	static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info)
2396	{
2397	bool update_headroom = false;
2398	struct nlattr **a = info->attrs;
2399	struct sk_buff *reply;
2400	struct datapath *dp;
2401	struct vport *vport;
2402	unsigned int new_headroom;
2403	int err;
2404
2405	reply = ovs_vport_cmd_alloc_info();
2406	if (!reply)
2407	return -ENOMEM;
2408
2409	ovs_lock();
2410	vport = lookup_vport(net: sock_net(sk: skb->sk), ovs_header: genl_info_userhdr(info), a);
2411	err = PTR_ERR(ptr: vport);
2412	if (IS_ERR(ptr: vport))
2413	goto exit_unlock_free;
2414
2415	if (vport->port_no == OVSP_LOCAL) {
2416	err = -EINVAL;
2417	goto exit_unlock_free;
2418	}
2419
2420	err = ovs_vport_cmd_fill_info(vport, skb: reply, net: genl_info_net(info),
2421	portid: info->snd_portid, seq: info->snd_seq, flags: 0,
2422	cmd: OVS_VPORT_CMD_DEL, GFP_KERNEL);
2423	BUG_ON(err < 0);
2424
2425	/* the vport deletion may trigger dp headroom update */
2426	dp = vport->dp;
2427	if (netdev_get_fwd_headroom(dev: vport->dev) == dp->max_headroom)
2428	update_headroom = true;
2429
2430	netdev_reset_rx_headroom(dev: vport->dev);
2431	ovs_dp_detach_port(p: vport);
2432
2433	if (update_headroom) {
2434	new_headroom = ovs_get_max_headroom(dp);
2435
2436	if (new_headroom < dp->max_headroom)
2437	ovs_update_headroom(dp, new_headroom);
2438	}
2439	ovs_unlock();
2440
2441	ovs_notify(family: &dp_vport_genl_family, skb: reply, info);
2442	return 0;
2443
2444	exit_unlock_free:
2445	ovs_unlock();
2446	kfree_skb(skb: reply);
2447	return err;
2448	}
2449
2450	static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info)
2451	{
2452	struct nlattr **a = info->attrs;
2453	struct ovs_header *ovs_header = genl_info_userhdr(info);
2454	struct sk_buff *reply;
2455	struct vport *vport;
2456	int err;
2457
2458	reply = ovs_vport_cmd_alloc_info();
2459	if (!reply)
2460	return -ENOMEM;
2461
2462	rcu_read_lock();
2463	vport = lookup_vport(net: sock_net(sk: skb->sk), ovs_header, a);
2464	err = PTR_ERR(ptr: vport);
2465	if (IS_ERR(ptr: vport))
2466	goto exit_unlock_free;
2467	err = ovs_vport_cmd_fill_info(vport, skb: reply, net: genl_info_net(info),
2468	portid: info->snd_portid, seq: info->snd_seq, flags: 0,
2469	cmd: OVS_VPORT_CMD_GET, GFP_ATOMIC);
2470	BUG_ON(err < 0);
2471	rcu_read_unlock();
2472
2473	return genlmsg_reply(skb: reply, info);
2474
2475	exit_unlock_free:
2476	rcu_read_unlock();
2477	kfree_skb(skb: reply);
2478	return err;
2479	}
2480
2481	static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb)
2482	{
2483	struct ovs_header *ovs_header = genlmsg_data(gnlh: nlmsg_data(nlh: cb->nlh));
2484	struct datapath *dp;
2485	int bucket = cb->args[0], skip = cb->args[1];
2486	int i, j = 0;
2487
2488	rcu_read_lock();
2489	dp = get_dp_rcu(net: sock_net(sk: skb->sk), dp_ifindex: ovs_header->dp_ifindex);
2490	if (!dp) {
2491	rcu_read_unlock();
2492	return -ENODEV;
2493	}
2494	for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) {
2495	struct vport *vport;
2496
2497	j = 0;
2498	hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) {
2499	if (j >= skip &&
2500	ovs_vport_cmd_fill_info(vport, skb,
2501	net: sock_net(sk: skb->sk),
2502	NETLINK_CB(cb->skb).portid,
2503	seq: cb->nlh->nlmsg_seq,
2504	NLM_F_MULTI,
2505	cmd: OVS_VPORT_CMD_GET,
2506	GFP_ATOMIC) < 0)
2507	goto out;
2508
2509	j++;
2510	}
2511	skip = 0;
2512	}
2513	out:
2514	rcu_read_unlock();
2515
2516	cb->args[0] = i;
2517	cb->args[1] = j;
2518
2519	return skb->len;
2520	}
2521
2522	static void ovs_dp_masks_rebalance(struct work_struct *work)
2523	{
2524	struct ovs_net *ovs_net = container_of(work, struct ovs_net,
2525	masks_rebalance.work);
2526	struct datapath *dp;
2527
2528	ovs_lock();
2529
2530	list_for_each_entry(dp, &ovs_net->dps, list_node)
2531	ovs_flow_masks_rebalance(table: &dp->table);
2532
2533	ovs_unlock();
2534
2535	schedule_delayed_work(dwork: &ovs_net->masks_rebalance,
2536	delay: msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2537	}
2538
2539	static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = {
2540	[OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 },
2541	[OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) },
2542	[OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 },
2543	[OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 },
2544	[OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_UNSPEC },
2545	[OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED },
2546	[OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0),
2547	[OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 },
2548	[OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED },
2549	};
2550
2551	static const struct genl_small_ops dp_vport_genl_ops[] = {
2552	{ .cmd = OVS_VPORT_CMD_NEW,
2553	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2554	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2555	.doit = ovs_vport_cmd_new
2556	},
2557	{ .cmd = OVS_VPORT_CMD_DEL,
2558	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2559	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2560	.doit = ovs_vport_cmd_del
2561	},
2562	{ .cmd = OVS_VPORT_CMD_GET,
2563	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2564	.flags = 0, /* OK for unprivileged users. */
2565	.doit = ovs_vport_cmd_get,
2566	.dumpit = ovs_vport_cmd_dump
2567	},
2568	{ .cmd = OVS_VPORT_CMD_SET,
2569	.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
2570	.flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */
2571	.doit = ovs_vport_cmd_set,
2572	},
2573	};
2574
2575	struct genl_family dp_vport_genl_family __ro_after_init = {
2576	.hdrsize = sizeof(struct ovs_header),
2577	.name = OVS_VPORT_FAMILY,
2578	.version = OVS_VPORT_VERSION,
2579	.maxattr = OVS_VPORT_ATTR_MAX,
2580	.policy = vport_policy,
2581	.netnsok = true,
2582	.parallel_ops = true,
2583	.small_ops = dp_vport_genl_ops,
2584	.n_small_ops = ARRAY_SIZE(dp_vport_genl_ops),
2585	.resv_start_op = OVS_VPORT_CMD_SET + 1,
2586	.mcgrps = &ovs_dp_vport_multicast_group,
2587	.n_mcgrps = 1,
2588	.module = THIS_MODULE,
2589	};
2590
2591	static struct genl_family * const dp_genl_families[] = {
2592	&dp_datapath_genl_family,
2593	&dp_vport_genl_family,
2594	&dp_flow_genl_family,
2595	&dp_packet_genl_family,
2596	&dp_meter_genl_family,
2597	#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
2598	&dp_ct_limit_genl_family,
2599	#endif
2600	};
2601
2602	static void dp_unregister_genl(int n_families)
2603	{
2604	int i;
2605
2606	for (i = 0; i < n_families; i++)
2607	genl_unregister_family(family: dp_genl_families[i]);
2608	}
2609
2610	static int __init dp_register_genl(void)
2611	{
2612	int err;
2613	int i;
2614
2615	for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) {
2616
2617	err = genl_register_family(family: dp_genl_families[i]);
2618	if (err)
2619	goto error;
2620	}
2621
2622	return 0;
2623
2624	error:
2625	dp_unregister_genl(n_families: i);
2626	return err;
2627	}
2628
2629	static int __net_init ovs_init_net(struct net *net)
2630	{
2631	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
2632	int err;
2633
2634	INIT_LIST_HEAD(list: &ovs_net->dps);
2635	INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq);
2636	INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance);
2637
2638	err = ovs_ct_init(net);
2639	if (err)
2640	return err;
2641
2642	schedule_delayed_work(dwork: &ovs_net->masks_rebalance,
2643	delay: msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL));
2644	return 0;
2645	}
2646
2647	static void __net_exit list_vports_from_net(struct net *net, struct net *dnet,
2648	struct list_head *head)
2649	{
2650	struct ovs_net *ovs_net = net_generic(net, id: ovs_net_id);
2651	struct datapath *dp;
2652
2653	list_for_each_entry(dp, &ovs_net->dps, list_node) {
2654	int i;
2655
2656	for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) {
2657	struct vport *vport;
2658
2659	hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) {
2660	if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL)
2661	continue;
2662
2663	if (dev_net(dev: vport->dev) == dnet)
2664	list_add(new: &vport->detach_list, head);
2665	}
2666	}
2667	}
2668	}
2669
2670	static void __net_exit ovs_exit_net(struct net *dnet)
2671	{
2672	struct datapath *dp, *dp_next;
2673	struct ovs_net *ovs_net = net_generic(net: dnet, id: ovs_net_id);
2674	struct vport *vport, *vport_next;
2675	struct net *net;
2676	LIST_HEAD(head);
2677
2678	ovs_lock();
2679
2680	ovs_ct_exit(dnet);
2681
2682	list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node)
2683	__dp_destroy(dp);
2684
2685	down_read(sem: &net_rwsem);
2686	for_each_net(net)
2687	list_vports_from_net(net, dnet, head: &head);
2688	up_read(sem: &net_rwsem);
2689
2690	/* Detach all vports from given namespace. */
2691	list_for_each_entry_safe(vport, vport_next, &head, detach_list) {
2692	list_del(entry: &vport->detach_list);
2693	ovs_dp_detach_port(p: vport);
2694	}
2695
2696	ovs_unlock();
2697
2698	cancel_delayed_work_sync(dwork: &ovs_net->masks_rebalance);
2699	cancel_work_sync(work: &ovs_net->dp_notify_work);
2700	}
2701
2702	static struct pernet_operations ovs_net_ops = {
2703	.init = ovs_init_net,
2704	.exit = ovs_exit_net,
2705	.id = &ovs_net_id,
2706	.size = sizeof(struct ovs_net),
2707	};
2708
2709	static const char * const ovs_drop_reasons[] = {
2710	#define S(x) (#x),
2711	OVS_DROP_REASONS(S)
2712	#undef S
2713	};
2714
2715	static struct drop_reason_list drop_reason_list_ovs = {
2716	.reasons = ovs_drop_reasons,
2717	.n_reasons = ARRAY_SIZE(ovs_drop_reasons),
2718	};
2719
2720	static int __init dp_init(void)
2721	{
2722	int err;
2723
2724	BUILD_BUG_ON(sizeof(struct ovs_skb_cb) >
2725	sizeof_field(struct sk_buff, cb));
2726
2727	pr_info("Open vSwitch switching datapath\n");
2728
2729	err = action_fifos_init();
2730	if (err)
2731	goto error;
2732
2733	err = ovs_internal_dev_rtnl_link_register();
2734	if (err)
2735	goto error_action_fifos_exit;
2736
2737	err = ovs_flow_init();
2738	if (err)
2739	goto error_unreg_rtnl_link;
2740
2741	err = ovs_vport_init();
2742	if (err)
2743	goto error_flow_exit;
2744
2745	err = register_pernet_device(&ovs_net_ops);
2746	if (err)
2747	goto error_vport_exit;
2748
2749	err = register_netdevice_notifier(nb: &ovs_dp_device_notifier);
2750	if (err)
2751	goto error_netns_exit;
2752
2753	err = ovs_netdev_init();
2754	if (err)
2755	goto error_unreg_notifier;
2756
2757	err = dp_register_genl();
2758	if (err < 0)
2759	goto error_unreg_netdev;
2760
2761	drop_reasons_register_subsys(subsys: SKB_DROP_REASON_SUBSYS_OPENVSWITCH,
2762	list: &drop_reason_list_ovs);
2763
2764	return 0;
2765
2766	error_unreg_netdev:
2767	ovs_netdev_exit();
2768	error_unreg_notifier:
2769	unregister_netdevice_notifier(nb: &ovs_dp_device_notifier);
2770	error_netns_exit:
2771	unregister_pernet_device(&ovs_net_ops);
2772	error_vport_exit:
2773	ovs_vport_exit();
2774	error_flow_exit:
2775	ovs_flow_exit();
2776	error_unreg_rtnl_link:
2777	ovs_internal_dev_rtnl_link_unregister();
2778	error_action_fifos_exit:
2779	action_fifos_exit();
2780	error:
2781	return err;
2782	}
2783
2784	static void dp_cleanup(void)
2785	{
2786	dp_unregister_genl(ARRAY_SIZE(dp_genl_families));
2787	ovs_netdev_exit();
2788	unregister_netdevice_notifier(nb: &ovs_dp_device_notifier);
2789	unregister_pernet_device(&ovs_net_ops);
2790	drop_reasons_unregister_subsys(subsys: SKB_DROP_REASON_SUBSYS_OPENVSWITCH);
2791	rcu_barrier();
2792	ovs_vport_exit();
2793	ovs_flow_exit();
2794	ovs_internal_dev_rtnl_link_unregister();
2795	action_fifos_exit();
2796	}
2797
2798	module_init(dp_init);
2799	module_exit(dp_cleanup);
2800
2801	MODULE_DESCRIPTION("Open vSwitch switching datapath");
2802	MODULE_LICENSE("GPL");
2803	MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY);
2804	MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY);
2805	MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY);
2806	MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY);
2807	MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY);
2808	MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY);
2809