blob: a664f7829a6d16db4579789ca5b8c40654cc78d7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Common framework for low-level network console, dump, and debugger code
3 *
4 * Sep 8 2003 Matt Mackall <mpm@selenic.com>
5 *
6 * based on the netconsole code from:
7 *
8 * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com>
9 * Copyright (C) 2002 Red Hat, Inc.
10 */
11
Joe Perchese6ec269352012-01-29 15:50:43 +000012#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
Anton Vorontsovbff38772009-07-08 11:10:56 -070014#include <linux/moduleparam.h>
Andy Shevchenko4cd57732013-06-04 19:46:26 +030015#include <linux/kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/netdevice.h>
17#include <linux/etherdevice.h>
18#include <linux/string.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -020019#include <linux/if_arp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/inetdevice.h>
21#include <linux/inet.h>
22#include <linux/interrupt.h>
23#include <linux/netpoll.h>
24#include <linux/sched.h>
25#include <linux/delay.h>
26#include <linux/rcupdate.h>
27#include <linux/workqueue.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Paul Gortmakerbc3b2d72011-07-15 11:47:34 -040029#include <linux/export.h>
Amerigo Wang689971b2012-08-10 01:24:49 +000030#include <linux/if_vlan.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <net/tcp.h>
32#include <net/udp.h>
Cong Wangb3d936f2013-01-07 20:52:41 +000033#include <net/addrconf.h>
34#include <net/ndisc.h>
35#include <net/ip6_checksum.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include <asm/unaligned.h>
David S. Miller9cbc1cb2009-06-15 03:02:23 -070037#include <trace/events/napi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39/*
40 * We maintain a small pool of fully-sized skbs, to make sure the
41 * message gets out even in extreme OOM situations.
42 */
43
44#define MAX_UDP_CHUNK 1460
45#define MAX_SKBS 32
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -080047static struct sk_buff_head skb_pool;
Linus Torvalds1da177e2005-04-16 15:20:36 -070048
49static atomic_t trapped;
50
Lai Jiangshan7f9421c2013-03-15 06:50:52 +000051DEFINE_STATIC_SRCU(netpoll_srcu);
Neil Hormanca99ca12013-02-05 08:05:43 +000052
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -070053#define USEC_PER_POLL 50
David S. Millerd9452e92008-03-04 12:28:49 -080054#define NETPOLL_RX_ENABLED 1
55#define NETPOLL_RX_DROP 2
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Joe Perches6f706242012-01-29 15:50:44 +000057#define MAX_SKB_SIZE \
58 (sizeof(struct ethhdr) + \
59 sizeof(struct iphdr) + \
60 sizeof(struct udphdr) + \
61 MAX_UDP_CHUNK)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
David S. Miller3578b0c2010-08-03 00:24:04 -070063static void zap_completion_queue(void);
Cong Wangb7394d22013-01-07 20:52:39 +000064static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo);
Neil Horman2cde6ac2013-02-11 10:25:30 +000065static void netpoll_async_cleanup(struct work_struct *work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066
Anton Vorontsovbff38772009-07-08 11:10:56 -070067static unsigned int carrier_timeout = 4;
68module_param(carrier_timeout, uint, 0644);
69
Joe Perchese6ec269352012-01-29 15:50:43 +000070#define np_info(np, fmt, ...) \
71 pr_info("%s: " fmt, np->name, ##__VA_ARGS__)
72#define np_err(np, fmt, ...) \
73 pr_err("%s: " fmt, np->name, ##__VA_ARGS__)
74#define np_notice(np, fmt, ...) \
75 pr_notice("%s: " fmt, np->name, ##__VA_ARGS__)
76
David Howellsc4028952006-11-22 14:57:56 +000077static void queue_process(struct work_struct *work)
Linus Torvalds1da177e2005-04-16 15:20:36 -070078{
David Howells4c1ac1b2006-12-05 14:37:56 +000079 struct netpoll_info *npinfo =
80 container_of(work, struct netpoll_info, tx_work.work);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 struct sk_buff *skb;
Ingo Molnar36405432006-12-12 17:20:42 +010082 unsigned long flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
Stephen Hemminger6c43ff12006-10-26 15:46:53 -070084 while ((skb = skb_dequeue(&npinfo->txq))) {
85 struct net_device *dev = skb->dev;
Stephen Hemminger00829822008-11-20 20:14:53 -080086 const struct net_device_ops *ops = dev->netdev_ops;
David S. Millerfd2ea0a2008-07-17 01:56:23 -070087 struct netdev_queue *txq;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Stephen Hemminger6c43ff12006-10-26 15:46:53 -070089 if (!netif_device_present(dev) || !netif_running(dev)) {
90 __kfree_skb(skb);
91 continue;
92 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
David S. Millerfd2ea0a2008-07-17 01:56:23 -070094 txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb));
95
Ingo Molnar36405432006-12-12 17:20:42 +010096 local_irq_save(flags);
David S. Millerfd2ea0a2008-07-17 01:56:23 -070097 __netif_tx_lock(txq, smp_processor_id());
Tom Herbert734664982011-11-28 16:32:44 +000098 if (netif_xmit_frozen_or_stopped(txq) ||
Stephen Hemminger00829822008-11-20 20:14:53 -080099 ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) {
Stephen Hemminger6c43ff12006-10-26 15:46:53 -0700100 skb_queue_head(&npinfo->txq, skb);
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700101 __netif_tx_unlock(txq);
Ingo Molnar36405432006-12-12 17:20:42 +0100102 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
Jarek Poplawski25442ca2007-07-05 17:42:44 -0700104 schedule_delayed_work(&npinfo->tx_work, HZ/10);
Stephen Hemminger6c43ff12006-10-26 15:46:53 -0700105 return;
106 }
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700107 __netif_tx_unlock(txq);
Ingo Molnar36405432006-12-12 17:20:42 +0100108 local_irq_restore(flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 }
110}
111
Al Virob51655b2006-11-14 21:40:42 -0800112static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh,
113 unsigned short ulen, __be32 saddr, __be32 daddr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
Al Virod6f5493c2006-11-14 21:26:08 -0800115 __wsum psum;
Herbert Xufb286bb2005-11-10 13:01:24 -0800116
Herbert Xu60476372007-04-09 11:59:39 -0700117 if (uh->check == 0 || skb_csum_unnecessary(skb))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 return 0;
119
Herbert Xufb286bb2005-11-10 13:01:24 -0800120 psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
Patrick McHardy84fa7932006-08-29 16:44:56 -0700122 if (skb->ip_summed == CHECKSUM_COMPLETE &&
Al Virod3bc23e2006-11-14 21:24:49 -0800123 !csum_fold(csum_add(psum, skb->csum)))
Herbert Xufb286bb2005-11-10 13:01:24 -0800124 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
Herbert Xufb286bb2005-11-10 13:01:24 -0800126 skb->csum = psum;
127
128 return __skb_checksum_complete(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131/*
132 * Check whether delayed processing was scheduled for our NIC. If so,
133 * we attempt to grab the poll lock and use ->poll() to pump the card.
134 * If this fails, either we've recursed in ->poll() or it's already
135 * running on another CPU.
136 *
137 * Note: we don't mask interrupts with this lock because we're using
138 * trylock here and interrupts are already disabled in the softirq
139 * case. Further, we test the poll_owner to avoid recursion on UP
140 * systems where the lock doesn't exist.
141 *
142 * In cases where there is bi-directional communications, reading only
143 * one message at a time can lead to packets being dropped by the
144 * network adapter, forcing superfluous retries and possibly timeouts.
145 * Thus, we set our budget to greater than 1.
146 */
David S. Miller0a7606c2007-10-29 21:28:47 -0700147static int poll_one_napi(struct netpoll_info *npinfo,
148 struct napi_struct *napi, int budget)
149{
150 int work;
151
152 /* net_rx_action's ->poll() invocations and our's are
153 * synchronized by this test which is only made while
154 * holding the napi->poll_lock.
155 */
156 if (!test_bit(NAPI_STATE_SCHED, &napi->state))
157 return budget;
158
David S. Millerd9452e92008-03-04 12:28:49 -0800159 npinfo->rx_flags |= NETPOLL_RX_DROP;
David S. Miller0a7606c2007-10-29 21:28:47 -0700160 atomic_inc(&trapped);
Neil Horman7b363e42008-12-09 23:22:26 -0800161 set_bit(NAPI_STATE_NPSVC, &napi->state);
David S. Miller0a7606c2007-10-29 21:28:47 -0700162
163 work = napi->poll(napi, budget);
David S. Miller7d18f112009-05-21 23:30:09 -0700164 trace_napi_poll(napi);
David S. Miller0a7606c2007-10-29 21:28:47 -0700165
Neil Horman7b363e42008-12-09 23:22:26 -0800166 clear_bit(NAPI_STATE_NPSVC, &napi->state);
David S. Miller0a7606c2007-10-29 21:28:47 -0700167 atomic_dec(&trapped);
David S. Millerd9452e92008-03-04 12:28:49 -0800168 npinfo->rx_flags &= ~NETPOLL_RX_DROP;
David S. Miller0a7606c2007-10-29 21:28:47 -0700169
170 return budget - work;
171}
172
Stephen Hemminger51069302007-11-19 19:18:11 -0800173static void poll_napi(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174{
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700175 struct napi_struct *napi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 int budget = 16;
177
Neil Hormanf13d4932010-10-19 07:04:26 +0000178 list_for_each_entry(napi, &dev->napi_list, dev_list) {
David S. Miller0a7606c2007-10-29 21:28:47 -0700179 if (napi->poll_owner != smp_processor_id() &&
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700180 spin_trylock(&napi->poll_lock)) {
Amerigo Wang28996562012-08-10 01:24:42 +0000181 budget = poll_one_napi(rcu_dereference_bh(dev->npinfo),
182 napi, budget);
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700183 spin_unlock(&napi->poll_lock);
David S. Miller0a7606c2007-10-29 21:28:47 -0700184
Amerigo Wang072a9c42012-08-24 21:41:11 +0000185 if (!budget)
David S. Miller0a7606c2007-10-29 21:28:47 -0700186 break;
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700187 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
189}
190
Cong Wangb7394d22013-01-07 20:52:39 +0000191static void service_neigh_queue(struct netpoll_info *npi)
Neil Horman068c6e92006-06-26 00:04:27 -0700192{
Stephen Hemminger51069302007-11-19 19:18:11 -0800193 if (npi) {
194 struct sk_buff *skb;
Neil Horman068c6e92006-06-26 00:04:27 -0700195
Cong Wangb7394d22013-01-07 20:52:39 +0000196 while ((skb = skb_dequeue(&npi->neigh_tx)))
197 netpoll_neigh_reply(skb, npi);
Neil Horman068c6e92006-06-26 00:04:27 -0700198 }
Neil Horman068c6e92006-06-26 00:04:27 -0700199}
200
Joe Perches234b9212011-06-30 15:08:57 +0000201static void netpoll_poll_dev(struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202{
Pavel Emelyanov5e392732009-05-11 00:36:35 +0000203 const struct net_device_ops *ops;
Amerigo Wang28996562012-08-10 01:24:42 +0000204 struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo);
Stephen Hemminger51069302007-11-19 19:18:11 -0800205
Neil Hormanca99ca12013-02-05 08:05:43 +0000206 /* Don't do any rx activity if the dev_lock mutex is held
207 * the dev_open/close paths use this to block netpoll activity
208 * while changing device state
209 */
Dan Carpentera3dbbc22013-05-06 02:15:13 +0000210 if (down_trylock(&ni->dev_lock))
Neil Hormanca99ca12013-02-05 08:05:43 +0000211 return;
212
Neil Horman959d5fd2013-02-13 11:32:42 -0500213 if (!netif_running(dev)) {
Neil Hormanbd7c4b62013-04-30 05:35:05 +0000214 up(&ni->dev_lock);
Pavel Emelyanov5e392732009-05-11 00:36:35 +0000215 return;
Neil Horman959d5fd2013-02-13 11:32:42 -0500216 }
Pavel Emelyanov5e392732009-05-11 00:36:35 +0000217
218 ops = dev->netdev_ops;
Neil Horman959d5fd2013-02-13 11:32:42 -0500219 if (!ops->ndo_poll_controller) {
Neil Hormanbd7c4b62013-04-30 05:35:05 +0000220 up(&ni->dev_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 return;
Neil Horman959d5fd2013-02-13 11:32:42 -0500222 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223
224 /* Process pending work on NIC */
Stephen Hemmingerd3147742008-11-19 21:32:24 -0800225 ops->ndo_poll_controller(dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Stephen Hemminger51069302007-11-19 19:18:11 -0800227 poll_napi(dev);
228
Neil Hormanbd7c4b62013-04-30 05:35:05 +0000229 up(&ni->dev_lock);
Neil Hormanca99ca12013-02-05 08:05:43 +0000230
Eric Dumazet58e05f32012-02-14 10:11:59 +0000231 if (dev->flags & IFF_SLAVE) {
Amerigo Wang28996562012-08-10 01:24:42 +0000232 if (ni) {
Jiri Pirko49bd8fb2013-01-03 22:48:55 +0000233 struct net_device *bond_dev;
Amerigo Wang5a698af2011-02-17 23:43:34 +0000234 struct sk_buff *skb;
Jiri Pirko49bd8fb2013-01-03 22:48:55 +0000235 struct netpoll_info *bond_ni;
236
237 bond_dev = netdev_master_upper_dev_get_rcu(dev);
238 bond_ni = rcu_dereference_bh(bond_dev->npinfo);
Cong Wangb7394d22013-01-07 20:52:39 +0000239 while ((skb = skb_dequeue(&ni->neigh_tx))) {
Amerigo Wang5a698af2011-02-17 23:43:34 +0000240 skb->dev = bond_dev;
Cong Wangb7394d22013-01-07 20:52:39 +0000241 skb_queue_tail(&bond_ni->neigh_tx, skb);
Amerigo Wang5a698af2011-02-17 23:43:34 +0000242 }
243 }
244 }
245
Cong Wangb7394d22013-01-07 20:52:39 +0000246 service_neigh_queue(ni);
Neil Horman068c6e92006-06-26 00:04:27 -0700247
David S. Miller3578b0c2010-08-03 00:24:04 -0700248 zap_completion_queue();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
dingtianhongda6e3782013-05-27 19:53:31 +0000251void netpoll_rx_disable(struct net_device *dev)
Neil Hormanca99ca12013-02-05 08:05:43 +0000252{
253 struct netpoll_info *ni;
254 int idx;
255 might_sleep();
256 idx = srcu_read_lock(&netpoll_srcu);
257 ni = srcu_dereference(dev->npinfo, &netpoll_srcu);
258 if (ni)
Neil Hormanbd7c4b62013-04-30 05:35:05 +0000259 down(&ni->dev_lock);
Neil Hormanca99ca12013-02-05 08:05:43 +0000260 srcu_read_unlock(&netpoll_srcu, idx);
Neil Hormanca99ca12013-02-05 08:05:43 +0000261}
262EXPORT_SYMBOL(netpoll_rx_disable);
263
264void netpoll_rx_enable(struct net_device *dev)
265{
266 struct netpoll_info *ni;
267 rcu_read_lock();
268 ni = rcu_dereference(dev->npinfo);
269 if (ni)
Neil Hormanbd7c4b62013-04-30 05:35:05 +0000270 up(&ni->dev_lock);
Neil Hormanca99ca12013-02-05 08:05:43 +0000271 rcu_read_unlock();
272}
273EXPORT_SYMBOL(netpoll_rx_enable);
274
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275static void refill_skbs(void)
276{
277 struct sk_buff *skb;
278 unsigned long flags;
279
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800280 spin_lock_irqsave(&skb_pool.lock, flags);
281 while (skb_pool.qlen < MAX_SKBS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC);
283 if (!skb)
284 break;
285
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800286 __skb_queue_tail(&skb_pool, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 }
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800288 spin_unlock_irqrestore(&skb_pool.lock, flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
David S. Miller3578b0c2010-08-03 00:24:04 -0700291static void zap_completion_queue(void)
292{
293 unsigned long flags;
294 struct softnet_data *sd = &get_cpu_var(softnet_data);
295
296 if (sd->completion_queue) {
297 struct sk_buff *clist;
298
299 local_irq_save(flags);
300 clist = sd->completion_queue;
301 sd->completion_queue = NULL;
302 local_irq_restore(flags);
303
304 while (clist != NULL) {
305 struct sk_buff *skb = clist;
306 clist = clist->next;
307 if (skb->destructor) {
308 atomic_inc(&skb->users);
309 dev_kfree_skb_any(skb); /* put this one back */
310 } else {
311 __kfree_skb(skb);
312 }
313 }
314 }
315
316 put_cpu_var(softnet_data);
317}
318
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800319static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320{
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800321 int count = 0;
322 struct sk_buff *skb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
David S. Miller3578b0c2010-08-03 00:24:04 -0700324 zap_completion_queue();
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800325 refill_skbs();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326repeat:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327
328 skb = alloc_skb(len, GFP_ATOMIC);
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800329 if (!skb)
330 skb = skb_dequeue(&skb_pool);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
332 if (!skb) {
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800333 if (++count < 10) {
Joe Perches2a49e002011-06-30 15:08:58 +0000334 netpoll_poll_dev(np->dev);
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800335 goto repeat;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 }
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -0800337 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 }
339
340 atomic_set(&skb->users, 1);
341 skb_reserve(skb, reserve);
342 return skb;
343}
344
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700345static int netpoll_owner_active(struct net_device *dev)
346{
347 struct napi_struct *napi;
348
349 list_for_each_entry(napi, &dev->napi_list, dev_list) {
350 if (napi->poll_owner == smp_processor_id())
351 return 1;
352 }
353 return 0;
354}
355
Amerigo Wang28996562012-08-10 01:24:42 +0000356/* call with IRQ disabled */
Neil Hormanc2355e12010-10-13 16:01:49 +0000357void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb,
358 struct net_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359{
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700360 int status = NETDEV_TX_BUSY;
361 unsigned long tries;
Stephen Hemminger00829822008-11-20 20:14:53 -0800362 const struct net_device_ops *ops = dev->netdev_ops;
Herbert Xude85d992010-06-10 16:12:44 +0000363 /* It is up to the caller to keep npinfo alive. */
Amerigo Wang28996562012-08-10 01:24:42 +0000364 struct netpoll_info *npinfo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
Amerigo Wang28996562012-08-10 01:24:42 +0000366 WARN_ON_ONCE(!irqs_disabled());
367
368 npinfo = rcu_dereference_bh(np->dev->npinfo);
YOSHIFUJI Hideaki4ec93ed2007-02-09 23:24:36 +0900369 if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) {
370 __kfree_skb(skb);
371 return;
372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700374 /* don't get messages out of order, and no recursion */
Stephen Hemmingerbea33482007-10-03 16:41:36 -0700375 if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) {
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700376 struct netdev_queue *txq;
Andrew Mortona49f99f2006-12-11 17:24:46 -0800377
Jason Wangf663dd92014-01-10 16:18:26 +0800378 txq = netdev_pick_tx(dev, skb, NULL);
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700379
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700380 /* try until next clock tick */
381 for (tries = jiffies_to_usecs(1)/USEC_PER_POLL;
382 tries > 0; --tries) {
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700383 if (__netif_tx_trylock(txq)) {
Tom Herbert734664982011-11-28 16:32:44 +0000384 if (!netif_xmit_stopped(txq)) {
Amerigo Wang689971b2012-08-10 01:24:49 +0000385 if (vlan_tx_tag_present(skb) &&
Patrick McHardy86a9bad2013-04-19 02:04:30 +0000386 !vlan_hw_offload_capable(netif_skb_features(skb),
387 skb->vlan_proto)) {
388 skb = __vlan_put_tag(skb, skb->vlan_proto, vlan_tx_tag_get(skb));
David S. Milleraca5f582014-01-02 19:50:52 -0500389 if (unlikely(!skb)) {
390 /* This is actually a packet drop, but we
391 * don't want the code at the end of this
392 * function to try and re-queue a NULL skb.
393 */
394 status = NETDEV_TX_OK;
395 goto unlock_txq;
396 }
Amerigo Wang689971b2012-08-10 01:24:49 +0000397 skb->vlan_tci = 0;
398 }
399
Stephen Hemminger00829822008-11-20 20:14:53 -0800400 status = ops->ndo_start_xmit(skb, dev);
Eric Dumazet08baf562009-05-25 22:58:01 -0700401 if (status == NETDEV_TX_OK)
402 txq_trans_update(txq);
403 }
David S. Milleraca5f582014-01-02 19:50:52 -0500404 unlock_txq:
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700405 __netif_tx_unlock(txq);
Matt Mackallf0d34592005-08-11 19:25:11 -0700406
Andrew Mortone37b8d92006-12-09 14:01:49 -0800407 if (status == NETDEV_TX_OK)
408 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409
Andrew Mortone37b8d92006-12-09 14:01:49 -0800410 }
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700411
412 /* tickle device maybe there is some cleanup */
Joe Perches2a49e002011-06-30 15:08:58 +0000413 netpoll_poll_dev(np->dev);
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700414
415 udelay(USEC_PER_POLL);
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700416 }
Dongdong Deng79b1bee2009-08-21 03:33:36 +0000417
418 WARN_ONCE(!irqs_disabled(),
Amerigo Wang28996562012-08-10 01:24:42 +0000419 "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n",
Dongdong Deng79b1bee2009-08-21 03:33:36 +0000420 dev->name, ops->ndo_start_xmit);
421
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700424 if (status != NETDEV_TX_OK) {
Stephen Hemminger5de4a472006-10-26 15:46:55 -0700425 skb_queue_tail(&npinfo->txq, skb);
David Howells4c1ac1b2006-12-05 14:37:56 +0000426 schedule_delayed_work(&npinfo->tx_work,0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428}
Neil Hormanc2355e12010-10-13 16:01:49 +0000429EXPORT_SYMBOL(netpoll_send_skb_on_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
431void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
432{
Eric Dumazet954fba02012-06-12 19:30:21 +0000433 int total_len, ip_len, udp_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 struct sk_buff *skb;
435 struct udphdr *udph;
436 struct iphdr *iph;
437 struct ethhdr *eth;
Eric Dumazetee130402012-08-24 01:47:26 +0000438 static atomic_t ip_ident;
Cong Wangb3d936f2013-01-07 20:52:41 +0000439 struct ipv6hdr *ip6h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440
441 udp_len = len + sizeof(*udph);
Cong Wangb3d936f2013-01-07 20:52:41 +0000442 if (np->ipv6)
443 ip_len = udp_len + sizeof(*ip6h);
444 else
Cong Wangb7394d22013-01-07 20:52:39 +0000445 ip_len = udp_len + sizeof(*iph);
446
Eric Dumazet954fba02012-06-12 19:30:21 +0000447 total_len = ip_len + LL_RESERVED_SPACE(np->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Eric Dumazet954fba02012-06-12 19:30:21 +0000449 skb = find_skb(np, total_len + np->dev->needed_tailroom,
450 total_len - len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 if (!skb)
452 return;
453
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300454 skb_copy_to_linear_data(skb, msg, len);
Eric Dumazet954fba02012-06-12 19:30:21 +0000455 skb_put(skb, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300457 skb_push(skb, sizeof(*udph));
458 skb_reset_transport_header(skb);
459 udph = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 udph->source = htons(np->local_port);
461 udph->dest = htons(np->remote_port);
462 udph->len = htons(udp_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
Cong Wangb3d936f2013-01-07 20:52:41 +0000464 if (np->ipv6) {
465 udph->check = 0;
466 udph->check = csum_ipv6_magic(&np->local_ip.in6,
467 &np->remote_ip.in6,
468 udp_len, IPPROTO_UDP,
469 csum_partial(udph, udp_len, 0));
470 if (udph->check == 0)
471 udph->check = CSUM_MANGLED_0;
472
473 skb_push(skb, sizeof(*ip6h));
474 skb_reset_network_header(skb);
475 ip6h = ipv6_hdr(skb);
476
477 /* ip6h->version = 6; ip6h->priority = 0; */
478 put_unaligned(0x60, (unsigned char *)ip6h);
479 ip6h->flow_lbl[0] = 0;
480 ip6h->flow_lbl[1] = 0;
481 ip6h->flow_lbl[2] = 0;
482
483 ip6h->payload_len = htons(sizeof(struct udphdr) + len);
484 ip6h->nexthdr = IPPROTO_UDP;
485 ip6h->hop_limit = 32;
486 ip6h->saddr = np->local_ip.in6;
487 ip6h->daddr = np->remote_ip.in6;
488
489 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
490 skb_reset_mac_header(skb);
491 skb->protocol = eth->h_proto = htons(ETH_P_IPV6);
492 } else {
Cong Wangb7394d22013-01-07 20:52:39 +0000493 udph->check = 0;
494 udph->check = csum_tcpudp_magic(np->local_ip.ip,
495 np->remote_ip.ip,
496 udp_len, IPPROTO_UDP,
497 csum_partial(udph, udp_len, 0));
498 if (udph->check == 0)
499 udph->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
Cong Wangb7394d22013-01-07 20:52:39 +0000501 skb_push(skb, sizeof(*iph));
502 skb_reset_network_header(skb);
503 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
Cong Wangb7394d22013-01-07 20:52:39 +0000505 /* iph->version = 4; iph->ihl = 5; */
506 put_unaligned(0x45, (unsigned char *)iph);
507 iph->tos = 0;
508 put_unaligned(htons(ip_len), &(iph->tot_len));
509 iph->id = htons(atomic_inc_return(&ip_ident));
510 iph->frag_off = 0;
511 iph->ttl = 64;
512 iph->protocol = IPPROTO_UDP;
513 iph->check = 0;
514 put_unaligned(np->local_ip.ip, &(iph->saddr));
515 put_unaligned(np->remote_ip.ip, &(iph->daddr));
516 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
517
518 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
519 skb_reset_mac_header(skb);
520 skb->protocol = eth->h_proto = htons(ETH_P_IP);
521 }
522
Joe Perchesc62326a2014-01-20 09:52:18 -0800523 ether_addr_copy(eth->h_source, np->dev->dev_addr);
524 ether_addr_copy(eth->h_dest, np->remote_mac);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
526 skb->dev = np->dev;
527
528 netpoll_send_skb(np, skb);
529}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000530EXPORT_SYMBOL(netpoll_send_udp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Cong Wangb7394d22013-01-07 20:52:39 +0000532static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533{
Cong Wangb3d936f2013-01-07 20:52:41 +0000534 int size, type = ARPOP_REPLY;
Al Viro252e33462006-11-14 20:48:11 -0800535 __be32 sip, tip;
Neil Horman47bbec02006-12-08 00:05:55 -0800536 unsigned char *sha;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 struct sk_buff *send_skb;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000538 struct netpoll *np, *tmp;
539 unsigned long flags;
Herbert Xuae641942011-11-18 02:20:04 +0000540 int hlen, tlen;
Cong Wangb7394d22013-01-07 20:52:39 +0000541 int hits = 0, proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000543 if (list_empty(&npinfo->rx_np))
544 return;
545
546 /* Before checking the packet, we do some early
547 inspection whether this is interesting at all */
548 spin_lock_irqsave(&npinfo->rx_lock, flags);
549 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
550 if (np->dev == skb->dev)
551 hits++;
552 }
553 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
554
555 /* No netpoll struct is using this dev */
556 if (!hits)
Jeff Moyer115c1d62005-06-22 22:05:31 -0700557 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
Cong Wangb7394d22013-01-07 20:52:39 +0000559 proto = ntohs(eth_hdr(skb)->h_proto);
Sonic Zhangb0dd6632013-09-11 11:31:53 +0800560 if (proto == ETH_P_ARP) {
Cong Wangb3d936f2013-01-07 20:52:41 +0000561 struct arphdr *arp;
562 unsigned char *arp_ptr;
Cong Wangb7394d22013-01-07 20:52:39 +0000563 /* No arp on this interface */
564 if (skb->dev->flags & IFF_NOARP)
565 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Cong Wangb7394d22013-01-07 20:52:39 +0000567 if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
568 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569
Cong Wangb7394d22013-01-07 20:52:39 +0000570 skb_reset_network_header(skb);
571 skb_reset_transport_header(skb);
572 arp = arp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573
Cong Wangb7394d22013-01-07 20:52:39 +0000574 if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
575 arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
576 arp->ar_pro != htons(ETH_P_IP) ||
577 arp->ar_op != htons(ARPOP_REQUEST))
578 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579
Cong Wangb7394d22013-01-07 20:52:39 +0000580 arp_ptr = (unsigned char *)(arp+1);
581 /* save the location of the src hw addr */
582 sha = arp_ptr;
583 arp_ptr += skb->dev->addr_len;
584 memcpy(&sip, arp_ptr, 4);
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000585 arp_ptr += 4;
Cong Wangb7394d22013-01-07 20:52:39 +0000586 /* If we actually cared about dst hw addr,
587 it would get copied here */
588 arp_ptr += skb->dev->addr_len;
589 memcpy(&tip, arp_ptr, 4);
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000590
Cong Wangb7394d22013-01-07 20:52:39 +0000591 /* Should we ignore arp? */
592 if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
593 return;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000594
Cong Wangb7394d22013-01-07 20:52:39 +0000595 size = arp_hdr_len(skb->dev);
596
597 spin_lock_irqsave(&npinfo->rx_lock, flags);
598 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
599 if (tip != np->local_ip.ip)
600 continue;
601
602 hlen = LL_RESERVED_SPACE(np->dev);
603 tlen = np->dev->needed_tailroom;
604 send_skb = find_skb(np, size + hlen + tlen, hlen);
605 if (!send_skb)
606 continue;
607
608 skb_reset_network_header(send_skb);
609 arp = (struct arphdr *) skb_put(send_skb, size);
610 send_skb->dev = skb->dev;
611 send_skb->protocol = htons(ETH_P_ARP);
612
613 /* Fill the device header for the ARP frame */
Cong Wangb3d936f2013-01-07 20:52:41 +0000614 if (dev_hard_header(send_skb, skb->dev, ETH_P_ARP,
Cong Wangb7394d22013-01-07 20:52:39 +0000615 sha, np->dev->dev_addr,
616 send_skb->len) < 0) {
617 kfree_skb(send_skb);
618 continue;
619 }
620
621 /*
622 * Fill out the arp protocol part.
623 *
624 * we only support ethernet device type,
625 * which (according to RFC 1390) should
626 * always equal 1 (Ethernet).
627 */
628
629 arp->ar_hrd = htons(np->dev->type);
630 arp->ar_pro = htons(ETH_P_IP);
631 arp->ar_hln = np->dev->addr_len;
632 arp->ar_pln = 4;
633 arp->ar_op = htons(type);
634
635 arp_ptr = (unsigned char *)(arp + 1);
636 memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
637 arp_ptr += np->dev->addr_len;
638 memcpy(arp_ptr, &tip, 4);
639 arp_ptr += 4;
640 memcpy(arp_ptr, sha, np->dev->addr_len);
641 arp_ptr += np->dev->addr_len;
642 memcpy(arp_ptr, &sip, 4);
643
644 netpoll_send_skb(np, send_skb);
645
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200646 /* If there are several rx_skb_hooks for the same
647 * address we're fine by sending a single reply
648 */
Cong Wangb7394d22013-01-07 20:52:39 +0000649 break;
650 }
651 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
Cong Wangb3d936f2013-01-07 20:52:41 +0000652 } else if( proto == ETH_P_IPV6) {
653#if IS_ENABLED(CONFIG_IPV6)
654 struct nd_msg *msg;
655 u8 *lladdr = NULL;
656 struct ipv6hdr *hdr;
657 struct icmp6hdr *icmp6h;
658 const struct in6_addr *saddr;
659 const struct in6_addr *daddr;
660 struct inet6_dev *in6_dev = NULL;
661 struct in6_addr *target;
662
663 in6_dev = in6_dev_get(skb->dev);
664 if (!in6_dev || !in6_dev->cnf.accept_ra)
665 return;
666
667 if (!pskb_may_pull(skb, skb->len))
668 return;
669
670 msg = (struct nd_msg *)skb_transport_header(skb);
671
672 __skb_push(skb, skb->data - skb_transport_header(skb));
673
674 if (ipv6_hdr(skb)->hop_limit != 255)
675 return;
676 if (msg->icmph.icmp6_code != 0)
677 return;
678 if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
679 return;
680
681 saddr = &ipv6_hdr(skb)->saddr;
682 daddr = &ipv6_hdr(skb)->daddr;
683
684 size = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
685
686 spin_lock_irqsave(&npinfo->rx_lock, flags);
687 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
Cong Wangfaeed822013-01-27 15:55:20 +0000688 if (!ipv6_addr_equal(daddr, &np->local_ip.in6))
Cong Wangb3d936f2013-01-07 20:52:41 +0000689 continue;
690
691 hlen = LL_RESERVED_SPACE(np->dev);
692 tlen = np->dev->needed_tailroom;
693 send_skb = find_skb(np, size + hlen + tlen, hlen);
694 if (!send_skb)
695 continue;
696
697 send_skb->protocol = htons(ETH_P_IPV6);
698 send_skb->dev = skb->dev;
699
700 skb_reset_network_header(send_skb);
Amerigo Wang00f97da2013-06-03 16:31:36 +0000701 hdr = (struct ipv6hdr *) skb_put(send_skb, sizeof(struct ipv6hdr));
Cong Wangb3d936f2013-01-07 20:52:41 +0000702 *(__be32*)hdr = htonl(0x60000000);
Cong Wangb3d936f2013-01-07 20:52:41 +0000703 hdr->payload_len = htons(size);
704 hdr->nexthdr = IPPROTO_ICMPV6;
705 hdr->hop_limit = 255;
706 hdr->saddr = *saddr;
707 hdr->daddr = *daddr;
708
Amerigo Wang00f97da2013-06-03 16:31:36 +0000709 icmp6h = (struct icmp6hdr *) skb_put(send_skb, sizeof(struct icmp6hdr));
Cong Wangb3d936f2013-01-07 20:52:41 +0000710 icmp6h->icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
711 icmp6h->icmp6_router = 0;
712 icmp6h->icmp6_solicited = 1;
Amerigo Wang00f97da2013-06-03 16:31:36 +0000713
714 target = (struct in6_addr *) skb_put(send_skb, sizeof(struct in6_addr));
Cong Wangb3d936f2013-01-07 20:52:41 +0000715 *target = msg->target;
716 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, size,
717 IPPROTO_ICMPV6,
718 csum_partial(icmp6h,
719 size, 0));
720
721 if (dev_hard_header(send_skb, skb->dev, ETH_P_IPV6,
722 lladdr, np->dev->dev_addr,
723 send_skb->len) < 0) {
724 kfree_skb(send_skb);
725 continue;
726 }
727
728 netpoll_send_skb(np, send_skb);
729
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200730 /* If there are several rx_skb_hooks for the same
731 * address, we're fine by sending a single reply
732 */
Cong Wangb3d936f2013-01-07 20:52:41 +0000733 break;
734 }
735 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
736#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738}
739
Cong Wangb3d936f2013-01-07 20:52:41 +0000740static bool pkt_is_ns(struct sk_buff *skb)
741{
742 struct nd_msg *msg;
743 struct ipv6hdr *hdr;
744
745 if (skb->protocol != htons(ETH_P_ARP))
746 return false;
747 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
748 return false;
749
750 msg = (struct nd_msg *)skb_transport_header(skb);
751 __skb_push(skb, skb->data - skb_transport_header(skb));
752 hdr = ipv6_hdr(skb);
753
754 if (hdr->nexthdr != IPPROTO_ICMPV6)
755 return false;
756 if (hdr->hop_limit != 255)
757 return false;
758 if (msg->icmph.icmp6_code != 0)
759 return false;
760 if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
761 return false;
762
763 return true;
764}
765
Amerigo Wang57c5d462012-08-10 01:24:40 +0000766int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200768 int proto, len, ulen, data_len;
769 int hits = 0, offset;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000770 const struct iphdr *iph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 struct udphdr *uh;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000772 struct netpoll *np, *tmp;
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200773 uint16_t source;
Neil Horman068c6e92006-06-26 00:04:27 -0700774
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000775 if (list_empty(&npinfo->rx_np))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776 goto out;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000777
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778 if (skb->dev->type != ARPHRD_ETHER)
779 goto out;
780
David S. Millerd9452e92008-03-04 12:28:49 -0800781 /* check if netpoll clients need ARP */
Cong Wangb3d936f2013-01-07 20:52:41 +0000782 if (skb->protocol == htons(ETH_P_ARP) && atomic_read(&trapped)) {
783 skb_queue_tail(&npinfo->neigh_tx, skb);
784 return 1;
785 } else if (pkt_is_ns(skb) && atomic_read(&trapped)) {
Cong Wangb7394d22013-01-07 20:52:39 +0000786 skb_queue_tail(&npinfo->neigh_tx, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 return 1;
788 }
789
Amerigo Wang689971b2012-08-10 01:24:49 +0000790 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
791 skb = vlan_untag(skb);
792 if (unlikely(!skb))
793 goto out;
794 }
795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 proto = ntohs(eth_hdr(skb)->h_proto);
Cong Wangb7394d22013-01-07 20:52:39 +0000797 if (proto != ETH_P_IP && proto != ETH_P_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 goto out;
799 if (skb->pkt_type == PACKET_OTHERHOST)
800 goto out;
801 if (skb_shared(skb))
802 goto out;
803
Cong Wangb7394d22013-01-07 20:52:39 +0000804 if (proto == ETH_P_IP) {
805 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
806 goto out;
807 iph = (struct iphdr *)skb->data;
808 if (iph->ihl < 5 || iph->version != 4)
809 goto out;
810 if (!pskb_may_pull(skb, iph->ihl*4))
811 goto out;
812 iph = (struct iphdr *)skb->data;
813 if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
814 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815
Cong Wangb7394d22013-01-07 20:52:39 +0000816 len = ntohs(iph->tot_len);
817 if (skb->len < len || len < iph->ihl*4)
818 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819
Cong Wangb7394d22013-01-07 20:52:39 +0000820 /*
821 * Our transport medium may have padded the buffer out.
822 * Now We trim to the true length of the frame.
823 */
824 if (pskb_trim_rcsum(skb, len))
825 goto out;
Aubrey.Li5e7d7fa2007-04-17 12:40:20 -0700826
Cong Wangb7394d22013-01-07 20:52:39 +0000827 iph = (struct iphdr *)skb->data;
828 if (iph->protocol != IPPROTO_UDP)
829 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
Cong Wangb7394d22013-01-07 20:52:39 +0000831 len -= iph->ihl*4;
832 uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200833 offset = (unsigned char *)(uh + 1) - skb->data;
Cong Wangb7394d22013-01-07 20:52:39 +0000834 ulen = ntohs(uh->len);
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200835 data_len = skb->len - offset;
836 source = ntohs(uh->source);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837
Cong Wangb7394d22013-01-07 20:52:39 +0000838 if (ulen != len)
839 goto out;
840 if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
841 goto out;
842 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
843 if (np->local_ip.ip && np->local_ip.ip != iph->daddr)
844 continue;
845 if (np->remote_ip.ip && np->remote_ip.ip != iph->saddr)
846 continue;
847 if (np->local_port && np->local_port != ntohs(uh->dest))
848 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200850 np->rx_skb_hook(np, source, skb, offset, data_len);
Cong Wangb7394d22013-01-07 20:52:39 +0000851 hits++;
852 }
Cong Wangb3d936f2013-01-07 20:52:41 +0000853 } else {
854#if IS_ENABLED(CONFIG_IPV6)
855 const struct ipv6hdr *ip6h;
856
857 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
858 goto out;
859 ip6h = (struct ipv6hdr *)skb->data;
860 if (ip6h->version != 6)
861 goto out;
862 len = ntohs(ip6h->payload_len);
863 if (!len)
864 goto out;
865 if (len + sizeof(struct ipv6hdr) > skb->len)
866 goto out;
867 if (pskb_trim_rcsum(skb, len + sizeof(struct ipv6hdr)))
868 goto out;
869 ip6h = ipv6_hdr(skb);
870 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
871 goto out;
872 uh = udp_hdr(skb);
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200873 offset = (unsigned char *)(uh + 1) - skb->data;
Cong Wangb3d936f2013-01-07 20:52:41 +0000874 ulen = ntohs(uh->len);
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200875 data_len = skb->len - offset;
876 source = ntohs(uh->source);
Cong Wangb3d936f2013-01-07 20:52:41 +0000877 if (ulen != skb->len)
878 goto out;
879 if (udp6_csum_init(skb, uh, IPPROTO_UDP))
880 goto out;
881 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
Cong Wangfaeed822013-01-27 15:55:20 +0000882 if (!ipv6_addr_equal(&np->local_ip.in6, &ip6h->daddr))
Cong Wangb3d936f2013-01-07 20:52:41 +0000883 continue;
Cong Wangfaeed822013-01-27 15:55:20 +0000884 if (!ipv6_addr_equal(&np->remote_ip.in6, &ip6h->saddr))
Cong Wangb3d936f2013-01-07 20:52:41 +0000885 continue;
886 if (np->local_port && np->local_port != ntohs(uh->dest))
887 continue;
888
Antonio Quartulli8fb479a2013-10-23 23:36:30 +0200889 np->rx_skb_hook(np, source, skb, offset, data_len);
Cong Wangb3d936f2013-01-07 20:52:41 +0000890 hits++;
891 }
892#endif
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000893 }
894
895 if (!hits)
896 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700897
898 kfree_skb(skb);
899 return 1;
900
901out:
902 if (atomic_read(&trapped)) {
903 kfree_skb(skb);
904 return 1;
905 }
906
907 return 0;
908}
909
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700910void netpoll_print_options(struct netpoll *np)
911{
Joe Perchese6ec269352012-01-29 15:50:43 +0000912 np_info(np, "local port %d\n", np->local_port);
Cong Wangb3d936f2013-01-07 20:52:41 +0000913 if (np->ipv6)
914 np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6);
915 else
Cong Wangb7394d22013-01-07 20:52:39 +0000916 np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip);
Joe Perchese6ec269352012-01-29 15:50:43 +0000917 np_info(np, "interface '%s'\n", np->dev_name);
918 np_info(np, "remote port %d\n", np->remote_port);
Cong Wangb3d936f2013-01-07 20:52:41 +0000919 if (np->ipv6)
920 np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6);
921 else
Cong Wangb7394d22013-01-07 20:52:39 +0000922 np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip);
Joe Perchese6ec269352012-01-29 15:50:43 +0000923 np_info(np, "remote ethernet address %pM\n", np->remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700924}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000925EXPORT_SYMBOL(netpoll_print_options);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700926
Cong Wangb7394d22013-01-07 20:52:39 +0000927static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)
928{
929 const char *end;
930
931 if (!strchr(str, ':') &&
932 in4_pton(str, -1, (void *)addr, -1, &end) > 0) {
933 if (!*end)
934 return 0;
935 }
936 if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) {
937#if IS_ENABLED(CONFIG_IPV6)
938 if (!*end)
939 return 1;
940#else
941 return -1;
942#endif
943 }
944 return -1;
945}
946
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947int netpoll_parse_options(struct netpoll *np, char *opt)
948{
949 char *cur=opt, *delim;
Cong Wangb7394d22013-01-07 20:52:39 +0000950 int ipv6;
Sabrina Dubroca00fe11b2014-02-06 18:34:12 +0100951 bool ipversion_set = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952
David S. Millerc68b9072006-11-14 20:40:49 -0800953 if (*cur != '@') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 if ((delim = strchr(cur, '@')) == NULL)
955 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800956 *delim = 0;
Abhijit Pawar4b5511e2012-12-09 23:12:28 +0000957 if (kstrtou16(cur, 10, &np->local_port))
958 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800959 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 }
961 cur++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962
David S. Millerc68b9072006-11-14 20:40:49 -0800963 if (*cur != '/') {
Sabrina Dubroca00fe11b2014-02-06 18:34:12 +0100964 ipversion_set = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965 if ((delim = strchr(cur, '/')) == NULL)
966 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800967 *delim = 0;
Cong Wangb7394d22013-01-07 20:52:39 +0000968 ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip);
969 if (ipv6 < 0)
970 goto parse_failed;
971 else
972 np->ipv6 = (bool)ipv6;
David S. Millerc68b9072006-11-14 20:40:49 -0800973 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 }
975 cur++;
976
David S. Millerc68b9072006-11-14 20:40:49 -0800977 if (*cur != ',') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 /* parse out dev name */
979 if ((delim = strchr(cur, ',')) == NULL)
980 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800981 *delim = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 strlcpy(np->dev_name, cur, sizeof(np->dev_name));
David S. Millerc68b9072006-11-14 20:40:49 -0800983 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 }
985 cur++;
986
David S. Millerc68b9072006-11-14 20:40:49 -0800987 if (*cur != '@') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700988 /* dst port */
989 if ((delim = strchr(cur, '@')) == NULL)
990 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800991 *delim = 0;
Amerigo Wang5fc05f82010-03-21 22:59:58 +0000992 if (*cur == ' ' || *cur == '\t')
Joe Perchese6ec269352012-01-29 15:50:43 +0000993 np_info(np, "warning: whitespace is not allowed\n");
Abhijit Pawar4b5511e2012-12-09 23:12:28 +0000994 if (kstrtou16(cur, 10, &np->remote_port))
995 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800996 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 }
998 cur++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999
1000 /* dst ip */
1001 if ((delim = strchr(cur, '/')) == NULL)
1002 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -08001003 *delim = 0;
Cong Wangb7394d22013-01-07 20:52:39 +00001004 ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip);
1005 if (ipv6 < 0)
1006 goto parse_failed;
Sabrina Dubroca00fe11b2014-02-06 18:34:12 +01001007 else if (ipversion_set && np->ipv6 != (bool)ipv6)
Cong Wangb7394d22013-01-07 20:52:39 +00001008 goto parse_failed;
1009 else
1010 np->ipv6 = (bool)ipv6;
David S. Millerc68b9072006-11-14 20:40:49 -08001011 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012
David S. Millerc68b9072006-11-14 20:40:49 -08001013 if (*cur != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014 /* MAC address */
Alexey Dobriyan4940fc82011-05-07 23:00:07 +00001015 if (!mac_pton(cur, np->remote_mac))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 goto parse_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 }
1018
Satyam Sharma0bcc1812007-08-10 15:35:05 -07001019 netpoll_print_options(np);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020
1021 return 0;
1022
1023 parse_failed:
Joe Perchese6ec269352012-01-29 15:50:43 +00001024 np_info(np, "couldn't parse config at '%s'!\n", cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 return -1;
1026}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001027EXPORT_SYMBOL(netpoll_parse_options);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028
Amerigo Wang47be03a22012-08-10 01:24:37 +00001029int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp)
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001030{
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001031 struct netpoll_info *npinfo;
1032 const struct net_device_ops *ops;
1033 unsigned long flags;
1034 int err;
1035
Jiri Pirko30fdd8a02012-07-17 05:22:35 +00001036 np->dev = ndev;
1037 strlcpy(np->dev_name, ndev->name, IFNAMSIZ);
Neil Horman2cde6ac2013-02-11 10:25:30 +00001038 INIT_WORK(&np->cleanup_work, netpoll_async_cleanup);
Jiri Pirko30fdd8a02012-07-17 05:22:35 +00001039
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001040 if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) ||
1041 !ndev->netdev_ops->ndo_poll_controller) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001042 np_err(np, "%s doesn't support polling, aborting\n",
1043 np->dev_name);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001044 err = -ENOTSUPP;
1045 goto out;
1046 }
1047
1048 if (!ndev->npinfo) {
Amerigo Wang47be03a22012-08-10 01:24:37 +00001049 npinfo = kmalloc(sizeof(*npinfo), gfp);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001050 if (!npinfo) {
1051 err = -ENOMEM;
1052 goto out;
1053 }
1054
1055 npinfo->rx_flags = 0;
1056 INIT_LIST_HEAD(&npinfo->rx_np);
1057
1058 spin_lock_init(&npinfo->rx_lock);
Neil Hormanbd7c4b62013-04-30 05:35:05 +00001059 sema_init(&npinfo->dev_lock, 1);
Cong Wangb7394d22013-01-07 20:52:39 +00001060 skb_queue_head_init(&npinfo->neigh_tx);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001061 skb_queue_head_init(&npinfo->txq);
1062 INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
1063
1064 atomic_set(&npinfo->refcnt, 1);
1065
1066 ops = np->dev->netdev_ops;
1067 if (ops->ndo_netpoll_setup) {
Amerigo Wang47be03a22012-08-10 01:24:37 +00001068 err = ops->ndo_netpoll_setup(ndev, npinfo, gfp);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001069 if (err)
1070 goto free_npinfo;
1071 }
1072 } else {
Neil Horman0790bbb2013-02-11 10:25:31 +00001073 npinfo = rtnl_dereference(ndev->npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001074 atomic_inc(&npinfo->refcnt);
1075 }
1076
1077 npinfo->netpoll = np;
1078
Antonio Quartulli8fb479a2013-10-23 23:36:30 +02001079 if (np->rx_skb_hook) {
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001080 spin_lock_irqsave(&npinfo->rx_lock, flags);
1081 npinfo->rx_flags |= NETPOLL_RX_ENABLED;
1082 list_add_tail(&np->rx, &npinfo->rx_np);
1083 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
1084 }
1085
1086 /* last thing to do is link it to the net device structure */
Eric Dumazetcf778b02012-01-12 04:41:32 +00001087 rcu_assign_pointer(ndev->npinfo, npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001088
1089 return 0;
1090
1091free_npinfo:
1092 kfree(npinfo);
1093out:
1094 return err;
1095}
1096EXPORT_SYMBOL_GPL(__netpoll_setup);
1097
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098int netpoll_setup(struct netpoll *np)
1099{
1100 struct net_device *ndev = NULL;
1101 struct in_device *in_dev;
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001102 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001103
Cong Wangf92d3182013-01-14 23:34:06 +00001104 rtnl_lock();
Cong Wang556e6252013-01-27 15:55:21 +00001105 if (np->dev_name) {
1106 struct net *net = current->nsproxy->net_ns;
1107 ndev = __dev_get_by_name(net, np->dev_name);
1108 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001109 if (!ndev) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001110 np_err(np, "%s doesn't exist, aborting\n", np->dev_name);
Cong Wangf92d3182013-01-14 23:34:06 +00001111 err = -ENODEV;
1112 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001113 }
Cong Wang5bd30d32013-01-17 12:21:08 +08001114 dev_hold(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001115
Jiri Pirko49bd8fb2013-01-03 22:48:55 +00001116 if (netdev_master_upper_dev_get(ndev)) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001117 np_err(np, "%s is a slave device, aborting\n", np->dev_name);
Dan Carpenter83fe32d2011-06-11 18:55:22 -07001118 err = -EBUSY;
1119 goto put;
WANG Cong0c1ad042011-06-09 00:28:13 -07001120 }
1121
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 if (!netif_running(ndev)) {
1123 unsigned long atmost, atleast;
1124
Joe Perchese6ec269352012-01-29 15:50:43 +00001125 np_info(np, "device %s not up yet, forcing it\n", np->dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001127 err = dev_open(ndev);
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001128
1129 if (err) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001130 np_err(np, "failed to open %s\n", ndev->name);
Herbert Xudbaa1542010-06-10 16:12:46 +00001131 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001132 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133
Cong Wangf92d3182013-01-14 23:34:06 +00001134 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001135 atleast = jiffies + HZ/10;
Anton Vorontsovbff38772009-07-08 11:10:56 -07001136 atmost = jiffies + carrier_timeout * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001137 while (!netif_carrier_ok(ndev)) {
1138 if (time_after(jiffies, atmost)) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001139 np_notice(np, "timeout waiting for carrier\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 break;
1141 }
Anton Vorontsov1b614fb2009-07-08 20:09:44 -07001142 msleep(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 }
1144
1145 /* If carrier appears to come up instantly, we don't
1146 * trust it and pause so that we don't pump all our
1147 * queued console messages into the bitbucket.
1148 */
1149
1150 if (time_before(jiffies, atleast)) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001151 np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152 msleep(4000);
1153 }
Cong Wangf92d3182013-01-14 23:34:06 +00001154 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 }
1156
Cong Wangb7394d22013-01-07 20:52:39 +00001157 if (!np->local_ip.ip) {
1158 if (!np->ipv6) {
Cong Wangf92d3182013-01-14 23:34:06 +00001159 in_dev = __in_dev_get_rtnl(ndev);
Cong Wangb7394d22013-01-07 20:52:39 +00001160
1161 if (!in_dev || !in_dev->ifa_list) {
Cong Wangb7394d22013-01-07 20:52:39 +00001162 np_err(np, "no IP address for %s, aborting\n",
1163 np->dev_name);
1164 err = -EDESTADDRREQ;
1165 goto put;
1166 }
1167
1168 np->local_ip.ip = in_dev->ifa_list->ifa_local;
Cong Wangb7394d22013-01-07 20:52:39 +00001169 np_info(np, "local IP %pI4\n", &np->local_ip.ip);
Cong Wangb3d936f2013-01-07 20:52:41 +00001170 } else {
1171#if IS_ENABLED(CONFIG_IPV6)
1172 struct inet6_dev *idev;
1173
1174 err = -EDESTADDRREQ;
Cong Wangb3d936f2013-01-07 20:52:41 +00001175 idev = __in6_dev_get(ndev);
1176 if (idev) {
1177 struct inet6_ifaddr *ifp;
1178
1179 read_lock_bh(&idev->lock);
1180 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1181 if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)
1182 continue;
1183 np->local_ip.in6 = ifp->addr;
1184 err = 0;
1185 break;
1186 }
1187 read_unlock_bh(&idev->lock);
1188 }
Cong Wangb3d936f2013-01-07 20:52:41 +00001189 if (err) {
1190 np_err(np, "no IPv6 address for %s, aborting\n",
1191 np->dev_name);
1192 goto put;
1193 } else
1194 np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6);
1195#else
1196 np_err(np, "IPv6 is not supported %s, aborting\n",
1197 np->dev_name);
Cong Wange39363a2013-01-22 17:39:11 +00001198 err = -EINVAL;
Cong Wangb3d936f2013-01-07 20:52:41 +00001199 goto put;
1200#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202 }
1203
Herbert Xudbaa1542010-06-10 16:12:46 +00001204 /* fill up the skb queue */
1205 refill_skbs();
1206
Amerigo Wang47be03a22012-08-10 01:24:37 +00001207 err = __netpoll_setup(np, ndev, GFP_KERNEL);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001208 if (err)
1209 goto put;
1210
Cong Wangf92d3182013-01-14 23:34:06 +00001211 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212 return 0;
1213
Jiri Slaby21edbb22010-03-16 05:29:54 +00001214put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001215 dev_put(ndev);
Cong Wangf92d3182013-01-14 23:34:06 +00001216unlock:
1217 rtnl_unlock();
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001218 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001220EXPORT_SYMBOL(netpoll_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221
David S. Millerc68b9072006-11-14 20:40:49 -08001222static int __init netpoll_init(void)
1223{
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -08001224 skb_queue_head_init(&skb_pool);
1225 return 0;
1226}
1227core_initcall(netpoll_init);
1228
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001229static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head)
1230{
1231 struct netpoll_info *npinfo =
1232 container_of(rcu_head, struct netpoll_info, rcu);
1233
Cong Wangb7394d22013-01-07 20:52:39 +00001234 skb_queue_purge(&npinfo->neigh_tx);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001235 skb_queue_purge(&npinfo->txq);
1236
1237 /* we can't call cancel_delayed_work_sync here, as we are in softirq */
1238 cancel_delayed_work(&npinfo->tx_work);
1239
1240 /* clean after last, unfinished work */
1241 __skb_queue_purge(&npinfo->txq);
1242 /* now cancel it again */
1243 cancel_delayed_work(&npinfo->tx_work);
1244 kfree(npinfo);
1245}
1246
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001247void __netpoll_cleanup(struct netpoll *np)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001248{
Jeff Moyerfbeec2e2005-06-22 22:05:59 -07001249 struct netpoll_info *npinfo;
1250 unsigned long flags;
1251
Neil Horman0790bbb2013-02-11 10:25:31 +00001252 /* rtnl_dereference would be preferable here but
1253 * rcu_cleanup_netpoll path can put us in here safely without
1254 * holding the rtnl, so plain rcu_dereference it is
1255 */
1256 npinfo = rtnl_dereference(np->dev->npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001257 if (!npinfo)
Herbert Xudbaa1542010-06-10 16:12:46 +00001258 return;
Stephen Hemminger93ec2c72006-10-26 15:46:50 -07001259
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001260 if (!list_empty(&npinfo->rx_np)) {
1261 spin_lock_irqsave(&npinfo->rx_lock, flags);
1262 list_del(&np->rx);
1263 if (list_empty(&npinfo->rx_np))
1264 npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
1265 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
Jeff Moyer115c1d62005-06-22 22:05:31 -07001266 }
Herbert Xudbaa1542010-06-10 16:12:46 +00001267
Neil Hormanca99ca12013-02-05 08:05:43 +00001268 synchronize_srcu(&netpoll_srcu);
1269
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001270 if (atomic_dec_and_test(&npinfo->refcnt)) {
1271 const struct net_device_ops *ops;
1272
1273 ops = np->dev->netdev_ops;
1274 if (ops->ndo_netpoll_cleanup)
1275 ops->ndo_netpoll_cleanup(np->dev);
1276
Neil Horman2cde6ac2013-02-11 10:25:30 +00001277 rcu_assign_pointer(np->dev->npinfo, NULL);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001278 call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info);
Herbert Xudbaa1542010-06-10 16:12:46 +00001279 }
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001280}
1281EXPORT_SYMBOL_GPL(__netpoll_cleanup);
1282
Neil Horman2cde6ac2013-02-11 10:25:30 +00001283static void netpoll_async_cleanup(struct work_struct *work)
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001284{
Neil Horman2cde6ac2013-02-11 10:25:30 +00001285 struct netpoll *np = container_of(work, struct netpoll, cleanup_work);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001286
Neil Horman2cde6ac2013-02-11 10:25:30 +00001287 rtnl_lock();
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001288 __netpoll_cleanup(np);
Neil Horman2cde6ac2013-02-11 10:25:30 +00001289 rtnl_unlock();
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001290 kfree(np);
1291}
1292
Neil Horman2cde6ac2013-02-11 10:25:30 +00001293void __netpoll_free_async(struct netpoll *np)
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001294{
Neil Horman2cde6ac2013-02-11 10:25:30 +00001295 schedule_work(&np->cleanup_work);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001296}
Neil Horman2cde6ac2013-02-11 10:25:30 +00001297EXPORT_SYMBOL_GPL(__netpoll_free_async);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001298
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001299void netpoll_cleanup(struct netpoll *np)
1300{
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001301 rtnl_lock();
Nikolay Aleksandrovd0fe8c882013-09-19 15:02:35 +02001302 if (!np->dev)
1303 goto out;
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001304 __netpoll_cleanup(np);
Herbert Xudbaa1542010-06-10 16:12:46 +00001305 dev_put(np->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001306 np->dev = NULL;
Nikolay Aleksandrovd0fe8c882013-09-19 15:02:35 +02001307out:
1308 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001310EXPORT_SYMBOL(netpoll_cleanup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001311
1312int netpoll_trap(void)
1313{
1314 return atomic_read(&trapped);
1315}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001316EXPORT_SYMBOL(netpoll_trap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001317
1318void netpoll_set_trap(int trap)
1319{
1320 if (trap)
1321 atomic_inc(&trapped);
1322 else
1323 atomic_dec(&trapped);
1324}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325EXPORT_SYMBOL(netpoll_set_trap);