blob: 2c637e9a0b277ff2a987edf139622d7580b43e02 [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 Pirko49bd8fb02013-01-03 22:48:55 +0000233 struct net_device *bond_dev;
Amerigo Wang5a698af2011-02-17 23:43:34 +0000234 struct sk_buff *skb;
Jiri Pirko49bd8fb02013-01-03 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
Amerigo Wang8c4c49d2012-09-17 20:16:31 +0000378 txq = netdev_pick_tx(dev, skb);
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));
Amerigo Wang689971b2012-08-10 01:24:49 +0000389 if (unlikely(!skb))
390 break;
391 skb->vlan_tci = 0;
392 }
393
Stephen Hemminger00829822008-11-20 20:14:53 -0800394 status = ops->ndo_start_xmit(skb, dev);
Eric Dumazet08baf562009-05-25 22:58:01 -0700395 if (status == NETDEV_TX_OK)
396 txq_trans_update(txq);
397 }
David S. Millerfd2ea0a2008-07-17 01:56:23 -0700398 __netif_tx_unlock(txq);
Matt Mackallf0d34592005-08-11 19:25:11 -0700399
Andrew Mortone37b8d92006-12-09 14:01:49 -0800400 if (status == NETDEV_TX_OK)
401 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
Andrew Mortone37b8d92006-12-09 14:01:49 -0800403 }
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700404
405 /* tickle device maybe there is some cleanup */
Joe Perches2a49e002011-06-30 15:08:58 +0000406 netpoll_poll_dev(np->dev);
Stephen Hemminger0db3dc72007-06-27 00:39:42 -0700407
408 udelay(USEC_PER_POLL);
Matt Mackall0db1d6f2005-08-11 19:25:54 -0700409 }
Dongdong Deng79b1bee2009-08-21 03:33:36 +0000410
411 WARN_ONCE(!irqs_disabled(),
Amerigo Wang28996562012-08-10 01:24:42 +0000412 "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n",
Dongdong Deng79b1bee2009-08-21 03:33:36 +0000413 dev->name, ops->ndo_start_xmit);
414
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
Stephen Hemminger2bdfe0b2006-10-26 15:46:54 -0700417 if (status != NETDEV_TX_OK) {
Stephen Hemminger5de4a472006-10-26 15:46:55 -0700418 skb_queue_tail(&npinfo->txq, skb);
David Howells4c1ac1b2006-12-05 14:37:56 +0000419 schedule_delayed_work(&npinfo->tx_work,0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
Neil Hormanc2355e12010-10-13 16:01:49 +0000422EXPORT_SYMBOL(netpoll_send_skb_on_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423
424void netpoll_send_udp(struct netpoll *np, const char *msg, int len)
425{
Eric Dumazet954fba02012-06-12 19:30:21 +0000426 int total_len, ip_len, udp_len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 struct sk_buff *skb;
428 struct udphdr *udph;
429 struct iphdr *iph;
430 struct ethhdr *eth;
Eric Dumazetee130402012-08-24 01:47:26 +0000431 static atomic_t ip_ident;
Cong Wangb3d936f2013-01-07 20:52:41 +0000432 struct ipv6hdr *ip6h;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
434 udp_len = len + sizeof(*udph);
Cong Wangb3d936f2013-01-07 20:52:41 +0000435 if (np->ipv6)
436 ip_len = udp_len + sizeof(*ip6h);
437 else
Cong Wangb7394d22013-01-07 20:52:39 +0000438 ip_len = udp_len + sizeof(*iph);
439
Eric Dumazet954fba02012-06-12 19:30:21 +0000440 total_len = ip_len + LL_RESERVED_SPACE(np->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Eric Dumazet954fba02012-06-12 19:30:21 +0000442 skb = find_skb(np, total_len + np->dev->needed_tailroom,
443 total_len - len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444 if (!skb)
445 return;
446
Arnaldo Carvalho de Melo27d7ff42007-03-31 11:55:19 -0300447 skb_copy_to_linear_data(skb, msg, len);
Eric Dumazet954fba02012-06-12 19:30:21 +0000448 skb_put(skb, len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Arnaldo Carvalho de Melo4bedb452007-03-13 14:28:48 -0300450 skb_push(skb, sizeof(*udph));
451 skb_reset_transport_header(skb);
452 udph = udp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 udph->source = htons(np->local_port);
454 udph->dest = htons(np->remote_port);
455 udph->len = htons(udp_len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
Cong Wangb3d936f2013-01-07 20:52:41 +0000457 if (np->ipv6) {
458 udph->check = 0;
459 udph->check = csum_ipv6_magic(&np->local_ip.in6,
460 &np->remote_ip.in6,
461 udp_len, IPPROTO_UDP,
462 csum_partial(udph, udp_len, 0));
463 if (udph->check == 0)
464 udph->check = CSUM_MANGLED_0;
465
466 skb_push(skb, sizeof(*ip6h));
467 skb_reset_network_header(skb);
468 ip6h = ipv6_hdr(skb);
469
470 /* ip6h->version = 6; ip6h->priority = 0; */
471 put_unaligned(0x60, (unsigned char *)ip6h);
472 ip6h->flow_lbl[0] = 0;
473 ip6h->flow_lbl[1] = 0;
474 ip6h->flow_lbl[2] = 0;
475
476 ip6h->payload_len = htons(sizeof(struct udphdr) + len);
477 ip6h->nexthdr = IPPROTO_UDP;
478 ip6h->hop_limit = 32;
479 ip6h->saddr = np->local_ip.in6;
480 ip6h->daddr = np->remote_ip.in6;
481
482 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
483 skb_reset_mac_header(skb);
484 skb->protocol = eth->h_proto = htons(ETH_P_IPV6);
485 } else {
Cong Wangb7394d22013-01-07 20:52:39 +0000486 udph->check = 0;
487 udph->check = csum_tcpudp_magic(np->local_ip.ip,
488 np->remote_ip.ip,
489 udp_len, IPPROTO_UDP,
490 csum_partial(udph, udp_len, 0));
491 if (udph->check == 0)
492 udph->check = CSUM_MANGLED_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Cong Wangb7394d22013-01-07 20:52:39 +0000494 skb_push(skb, sizeof(*iph));
495 skb_reset_network_header(skb);
496 iph = ip_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497
Cong Wangb7394d22013-01-07 20:52:39 +0000498 /* iph->version = 4; iph->ihl = 5; */
499 put_unaligned(0x45, (unsigned char *)iph);
500 iph->tos = 0;
501 put_unaligned(htons(ip_len), &(iph->tot_len));
502 iph->id = htons(atomic_inc_return(&ip_ident));
503 iph->frag_off = 0;
504 iph->ttl = 64;
505 iph->protocol = IPPROTO_UDP;
506 iph->check = 0;
507 put_unaligned(np->local_ip.ip, &(iph->saddr));
508 put_unaligned(np->remote_ip.ip, &(iph->daddr));
509 iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
510
511 eth = (struct ethhdr *) skb_push(skb, ETH_HLEN);
512 skb_reset_mac_header(skb);
513 skb->protocol = eth->h_proto = htons(ETH_P_IP);
514 }
515
Stephen Hemminger09538642007-11-19 19:23:29 -0800516 memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN);
517 memcpy(eth->h_dest, np->remote_mac, ETH_ALEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518
519 skb->dev = np->dev;
520
521 netpoll_send_skb(np, skb);
522}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000523EXPORT_SYMBOL(netpoll_send_udp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524
Cong Wangb7394d22013-01-07 20:52:39 +0000525static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526{
Cong Wangb3d936f2013-01-07 20:52:41 +0000527 int size, type = ARPOP_REPLY;
Al Viro252e3342006-11-14 20:48:11 -0800528 __be32 sip, tip;
Neil Horman47bbec02006-12-08 00:05:55 -0800529 unsigned char *sha;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 struct sk_buff *send_skb;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000531 struct netpoll *np, *tmp;
532 unsigned long flags;
Herbert Xuae641942011-11-18 02:20:04 +0000533 int hlen, tlen;
Cong Wangb7394d22013-01-07 20:52:39 +0000534 int hits = 0, proto;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000536 if (list_empty(&npinfo->rx_np))
537 return;
538
539 /* Before checking the packet, we do some early
540 inspection whether this is interesting at all */
541 spin_lock_irqsave(&npinfo->rx_lock, flags);
542 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
543 if (np->dev == skb->dev)
544 hits++;
545 }
546 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
547
548 /* No netpoll struct is using this dev */
549 if (!hits)
Jeff Moyer115c1d62005-06-22 22:05:31 -0700550 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551
Cong Wangb7394d22013-01-07 20:52:39 +0000552 proto = ntohs(eth_hdr(skb)->h_proto);
553 if (proto == ETH_P_IP) {
Cong Wangb3d936f2013-01-07 20:52:41 +0000554 struct arphdr *arp;
555 unsigned char *arp_ptr;
Cong Wangb7394d22013-01-07 20:52:39 +0000556 /* No arp on this interface */
557 if (skb->dev->flags & IFF_NOARP)
558 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559
Cong Wangb7394d22013-01-07 20:52:39 +0000560 if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
561 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562
Cong Wangb7394d22013-01-07 20:52:39 +0000563 skb_reset_network_header(skb);
564 skb_reset_transport_header(skb);
565 arp = arp_hdr(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566
Cong Wangb7394d22013-01-07 20:52:39 +0000567 if ((arp->ar_hrd != htons(ARPHRD_ETHER) &&
568 arp->ar_hrd != htons(ARPHRD_IEEE802)) ||
569 arp->ar_pro != htons(ETH_P_IP) ||
570 arp->ar_op != htons(ARPOP_REQUEST))
571 return;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572
Cong Wangb7394d22013-01-07 20:52:39 +0000573 arp_ptr = (unsigned char *)(arp+1);
574 /* save the location of the src hw addr */
575 sha = arp_ptr;
576 arp_ptr += skb->dev->addr_len;
577 memcpy(&sip, arp_ptr, 4);
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000578 arp_ptr += 4;
Cong Wangb7394d22013-01-07 20:52:39 +0000579 /* If we actually cared about dst hw addr,
580 it would get copied here */
581 arp_ptr += skb->dev->addr_len;
582 memcpy(&tip, arp_ptr, 4);
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000583
Cong Wangb7394d22013-01-07 20:52:39 +0000584 /* Should we ignore arp? */
585 if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip))
586 return;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000587
Cong Wangb7394d22013-01-07 20:52:39 +0000588 size = arp_hdr_len(skb->dev);
589
590 spin_lock_irqsave(&npinfo->rx_lock, flags);
591 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
592 if (tip != np->local_ip.ip)
593 continue;
594
595 hlen = LL_RESERVED_SPACE(np->dev);
596 tlen = np->dev->needed_tailroom;
597 send_skb = find_skb(np, size + hlen + tlen, hlen);
598 if (!send_skb)
599 continue;
600
601 skb_reset_network_header(send_skb);
602 arp = (struct arphdr *) skb_put(send_skb, size);
603 send_skb->dev = skb->dev;
604 send_skb->protocol = htons(ETH_P_ARP);
605
606 /* Fill the device header for the ARP frame */
Cong Wangb3d936f2013-01-07 20:52:41 +0000607 if (dev_hard_header(send_skb, skb->dev, ETH_P_ARP,
Cong Wangb7394d22013-01-07 20:52:39 +0000608 sha, np->dev->dev_addr,
609 send_skb->len) < 0) {
610 kfree_skb(send_skb);
611 continue;
612 }
613
614 /*
615 * Fill out the arp protocol part.
616 *
617 * we only support ethernet device type,
618 * which (according to RFC 1390) should
619 * always equal 1 (Ethernet).
620 */
621
622 arp->ar_hrd = htons(np->dev->type);
623 arp->ar_pro = htons(ETH_P_IP);
624 arp->ar_hln = np->dev->addr_len;
625 arp->ar_pln = 4;
626 arp->ar_op = htons(type);
627
628 arp_ptr = (unsigned char *)(arp + 1);
629 memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len);
630 arp_ptr += np->dev->addr_len;
631 memcpy(arp_ptr, &tip, 4);
632 arp_ptr += 4;
633 memcpy(arp_ptr, sha, np->dev->addr_len);
634 arp_ptr += np->dev->addr_len;
635 memcpy(arp_ptr, &sip, 4);
636
637 netpoll_send_skb(np, send_skb);
638
639 /* If there are several rx_hooks for the same address,
640 we're fine by sending a single reply */
641 break;
642 }
643 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
Cong Wangb3d936f2013-01-07 20:52:41 +0000644 } else if( proto == ETH_P_IPV6) {
645#if IS_ENABLED(CONFIG_IPV6)
646 struct nd_msg *msg;
647 u8 *lladdr = NULL;
648 struct ipv6hdr *hdr;
649 struct icmp6hdr *icmp6h;
650 const struct in6_addr *saddr;
651 const struct in6_addr *daddr;
652 struct inet6_dev *in6_dev = NULL;
653 struct in6_addr *target;
654
655 in6_dev = in6_dev_get(skb->dev);
656 if (!in6_dev || !in6_dev->cnf.accept_ra)
657 return;
658
659 if (!pskb_may_pull(skb, skb->len))
660 return;
661
662 msg = (struct nd_msg *)skb_transport_header(skb);
663
664 __skb_push(skb, skb->data - skb_transport_header(skb));
665
666 if (ipv6_hdr(skb)->hop_limit != 255)
667 return;
668 if (msg->icmph.icmp6_code != 0)
669 return;
670 if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
671 return;
672
673 saddr = &ipv6_hdr(skb)->saddr;
674 daddr = &ipv6_hdr(skb)->daddr;
675
676 size = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
677
678 spin_lock_irqsave(&npinfo->rx_lock, flags);
679 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
Cong Wangfaeed822013-01-27 15:55:20 +0000680 if (!ipv6_addr_equal(daddr, &np->local_ip.in6))
Cong Wangb3d936f2013-01-07 20:52:41 +0000681 continue;
682
683 hlen = LL_RESERVED_SPACE(np->dev);
684 tlen = np->dev->needed_tailroom;
685 send_skb = find_skb(np, size + hlen + tlen, hlen);
686 if (!send_skb)
687 continue;
688
689 send_skb->protocol = htons(ETH_P_IPV6);
690 send_skb->dev = skb->dev;
691
692 skb_reset_network_header(send_skb);
Amerigo Wang00f97da2013-06-03 16:31:36 +0000693 hdr = (struct ipv6hdr *) skb_put(send_skb, sizeof(struct ipv6hdr));
Cong Wangb3d936f2013-01-07 20:52:41 +0000694 *(__be32*)hdr = htonl(0x60000000);
Cong Wangb3d936f2013-01-07 20:52:41 +0000695 hdr->payload_len = htons(size);
696 hdr->nexthdr = IPPROTO_ICMPV6;
697 hdr->hop_limit = 255;
698 hdr->saddr = *saddr;
699 hdr->daddr = *daddr;
700
Amerigo Wang00f97da2013-06-03 16:31:36 +0000701 icmp6h = (struct icmp6hdr *) skb_put(send_skb, sizeof(struct icmp6hdr));
Cong Wangb3d936f2013-01-07 20:52:41 +0000702 icmp6h->icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT;
703 icmp6h->icmp6_router = 0;
704 icmp6h->icmp6_solicited = 1;
Amerigo Wang00f97da2013-06-03 16:31:36 +0000705
706 target = (struct in6_addr *) skb_put(send_skb, sizeof(struct in6_addr));
Cong Wangb3d936f2013-01-07 20:52:41 +0000707 *target = msg->target;
708 icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, size,
709 IPPROTO_ICMPV6,
710 csum_partial(icmp6h,
711 size, 0));
712
713 if (dev_hard_header(send_skb, skb->dev, ETH_P_IPV6,
714 lladdr, np->dev->dev_addr,
715 send_skb->len) < 0) {
716 kfree_skb(send_skb);
717 continue;
718 }
719
720 netpoll_send_skb(np, send_skb);
721
722 /* If there are several rx_hooks for the same address,
723 we're fine by sending a single reply */
724 break;
725 }
726 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
727#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729}
730
Cong Wangb3d936f2013-01-07 20:52:41 +0000731static bool pkt_is_ns(struct sk_buff *skb)
732{
733 struct nd_msg *msg;
734 struct ipv6hdr *hdr;
735
736 if (skb->protocol != htons(ETH_P_ARP))
737 return false;
738 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg)))
739 return false;
740
741 msg = (struct nd_msg *)skb_transport_header(skb);
742 __skb_push(skb, skb->data - skb_transport_header(skb));
743 hdr = ipv6_hdr(skb);
744
745 if (hdr->nexthdr != IPPROTO_ICMPV6)
746 return false;
747 if (hdr->hop_limit != 255)
748 return false;
749 if (msg->icmph.icmp6_code != 0)
750 return false;
751 if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION)
752 return false;
753
754 return true;
755}
756
Amerigo Wang57c5d462012-08-10 01:24:40 +0000757int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758{
759 int proto, len, ulen;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000760 int hits = 0;
Eric Dumazetb71d1d42011-04-22 04:53:02 +0000761 const struct iphdr *iph;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 struct udphdr *uh;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000763 struct netpoll *np, *tmp;
Neil Horman068c6e92006-06-26 00:04:27 -0700764
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000765 if (list_empty(&npinfo->rx_np))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 goto out;
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000767
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 if (skb->dev->type != ARPHRD_ETHER)
769 goto out;
770
David S. Millerd9452e92008-03-04 12:28:49 -0800771 /* check if netpoll clients need ARP */
Cong Wangb3d936f2013-01-07 20:52:41 +0000772 if (skb->protocol == htons(ETH_P_ARP) && atomic_read(&trapped)) {
773 skb_queue_tail(&npinfo->neigh_tx, skb);
774 return 1;
775 } else if (pkt_is_ns(skb) && atomic_read(&trapped)) {
Cong Wangb7394d22013-01-07 20:52:39 +0000776 skb_queue_tail(&npinfo->neigh_tx, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777 return 1;
778 }
779
Amerigo Wang689971b2012-08-10 01:24:49 +0000780 if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) {
781 skb = vlan_untag(skb);
782 if (unlikely(!skb))
783 goto out;
784 }
785
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 proto = ntohs(eth_hdr(skb)->h_proto);
Cong Wangb7394d22013-01-07 20:52:39 +0000787 if (proto != ETH_P_IP && proto != ETH_P_IPV6)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 goto out;
789 if (skb->pkt_type == PACKET_OTHERHOST)
790 goto out;
791 if (skb_shared(skb))
792 goto out;
793
Cong Wangb7394d22013-01-07 20:52:39 +0000794 if (proto == ETH_P_IP) {
795 if (!pskb_may_pull(skb, sizeof(struct iphdr)))
796 goto out;
797 iph = (struct iphdr *)skb->data;
798 if (iph->ihl < 5 || iph->version != 4)
799 goto out;
800 if (!pskb_may_pull(skb, iph->ihl*4))
801 goto out;
802 iph = (struct iphdr *)skb->data;
803 if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
804 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805
Cong Wangb7394d22013-01-07 20:52:39 +0000806 len = ntohs(iph->tot_len);
807 if (skb->len < len || len < iph->ihl*4)
808 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
Cong Wangb7394d22013-01-07 20:52:39 +0000810 /*
811 * Our transport medium may have padded the buffer out.
812 * Now We trim to the true length of the frame.
813 */
814 if (pskb_trim_rcsum(skb, len))
815 goto out;
Aubrey.Li5e7d7fa2007-04-17 12:40:20 -0700816
Cong Wangb7394d22013-01-07 20:52:39 +0000817 iph = (struct iphdr *)skb->data;
818 if (iph->protocol != IPPROTO_UDP)
819 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820
Cong Wangb7394d22013-01-07 20:52:39 +0000821 len -= iph->ihl*4;
822 uh = (struct udphdr *)(((char *)iph) + iph->ihl*4);
823 ulen = ntohs(uh->len);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824
Cong Wangb7394d22013-01-07 20:52:39 +0000825 if (ulen != len)
826 goto out;
827 if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr))
828 goto out;
829 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
830 if (np->local_ip.ip && np->local_ip.ip != iph->daddr)
831 continue;
832 if (np->remote_ip.ip && np->remote_ip.ip != iph->saddr)
833 continue;
834 if (np->local_port && np->local_port != ntohs(uh->dest))
835 continue;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836
Cong Wangb7394d22013-01-07 20:52:39 +0000837 np->rx_hook(np, ntohs(uh->source),
838 (char *)(uh+1),
839 ulen - sizeof(struct udphdr));
840 hits++;
841 }
Cong Wangb3d936f2013-01-07 20:52:41 +0000842 } else {
843#if IS_ENABLED(CONFIG_IPV6)
844 const struct ipv6hdr *ip6h;
845
846 if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
847 goto out;
848 ip6h = (struct ipv6hdr *)skb->data;
849 if (ip6h->version != 6)
850 goto out;
851 len = ntohs(ip6h->payload_len);
852 if (!len)
853 goto out;
854 if (len + sizeof(struct ipv6hdr) > skb->len)
855 goto out;
856 if (pskb_trim_rcsum(skb, len + sizeof(struct ipv6hdr)))
857 goto out;
858 ip6h = ipv6_hdr(skb);
859 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
860 goto out;
861 uh = udp_hdr(skb);
862 ulen = ntohs(uh->len);
863 if (ulen != skb->len)
864 goto out;
865 if (udp6_csum_init(skb, uh, IPPROTO_UDP))
866 goto out;
867 list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) {
Cong Wangfaeed822013-01-27 15:55:20 +0000868 if (!ipv6_addr_equal(&np->local_ip.in6, &ip6h->daddr))
Cong Wangb3d936f2013-01-07 20:52:41 +0000869 continue;
Cong Wangfaeed822013-01-27 15:55:20 +0000870 if (!ipv6_addr_equal(&np->remote_ip.in6, &ip6h->saddr))
Cong Wangb3d936f2013-01-07 20:52:41 +0000871 continue;
872 if (np->local_port && np->local_port != ntohs(uh->dest))
873 continue;
874
875 np->rx_hook(np, ntohs(uh->source),
876 (char *)(uh+1),
877 ulen - sizeof(struct udphdr));
878 hits++;
879 }
880#endif
Daniel Borkmann508e14b2010-01-12 14:27:30 +0000881 }
882
883 if (!hits)
884 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700885
886 kfree_skb(skb);
887 return 1;
888
889out:
890 if (atomic_read(&trapped)) {
891 kfree_skb(skb);
892 return 1;
893 }
894
895 return 0;
896}
897
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700898void netpoll_print_options(struct netpoll *np)
899{
Joe Perchese6ec269352012-01-29 15:50:43 +0000900 np_info(np, "local port %d\n", np->local_port);
Cong Wangb3d936f2013-01-07 20:52:41 +0000901 if (np->ipv6)
902 np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6);
903 else
Cong Wangb7394d22013-01-07 20:52:39 +0000904 np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip);
Joe Perchese6ec269352012-01-29 15:50:43 +0000905 np_info(np, "interface '%s'\n", np->dev_name);
906 np_info(np, "remote port %d\n", np->remote_port);
Cong Wangb3d936f2013-01-07 20:52:41 +0000907 if (np->ipv6)
908 np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6);
909 else
Cong Wangb7394d22013-01-07 20:52:39 +0000910 np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip);
Joe Perchese6ec269352012-01-29 15:50:43 +0000911 np_info(np, "remote ethernet address %pM\n", np->remote_mac);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700912}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +0000913EXPORT_SYMBOL(netpoll_print_options);
Satyam Sharma0bcc1812007-08-10 15:35:05 -0700914
Cong Wangb7394d22013-01-07 20:52:39 +0000915static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr)
916{
917 const char *end;
918
919 if (!strchr(str, ':') &&
920 in4_pton(str, -1, (void *)addr, -1, &end) > 0) {
921 if (!*end)
922 return 0;
923 }
924 if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) {
925#if IS_ENABLED(CONFIG_IPV6)
926 if (!*end)
927 return 1;
928#else
929 return -1;
930#endif
931 }
932 return -1;
933}
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935int netpoll_parse_options(struct netpoll *np, char *opt)
936{
937 char *cur=opt, *delim;
Cong Wangb7394d22013-01-07 20:52:39 +0000938 int ipv6;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939
David S. Millerc68b9072006-11-14 20:40:49 -0800940 if (*cur != '@') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 if ((delim = strchr(cur, '@')) == NULL)
942 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800943 *delim = 0;
Abhijit Pawar4b5511e2012-12-09 23:12:28 +0000944 if (kstrtou16(cur, 10, &np->local_port))
945 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800946 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 }
948 cur++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949
David S. Millerc68b9072006-11-14 20:40:49 -0800950 if (*cur != '/') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 if ((delim = strchr(cur, '/')) == NULL)
952 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800953 *delim = 0;
Cong Wangb7394d22013-01-07 20:52:39 +0000954 ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip);
955 if (ipv6 < 0)
956 goto parse_failed;
957 else
958 np->ipv6 = (bool)ipv6;
David S. Millerc68b9072006-11-14 20:40:49 -0800959 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 }
961 cur++;
962
David S. Millerc68b9072006-11-14 20:40:49 -0800963 if (*cur != ',') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 /* parse out dev name */
965 if ((delim = strchr(cur, ',')) == NULL)
966 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800967 *delim = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 strlcpy(np->dev_name, cur, sizeof(np->dev_name));
David S. Millerc68b9072006-11-14 20:40:49 -0800969 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 }
971 cur++;
972
David S. Millerc68b9072006-11-14 20:40:49 -0800973 if (*cur != '@') {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974 /* dst port */
975 if ((delim = strchr(cur, '@')) == NULL)
976 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800977 *delim = 0;
Amerigo Wang5fc05f82010-03-21 22:59:58 +0000978 if (*cur == ' ' || *cur == '\t')
Joe Perchese6ec269352012-01-29 15:50:43 +0000979 np_info(np, "warning: whitespace is not allowed\n");
Abhijit Pawar4b5511e2012-12-09 23:12:28 +0000980 if (kstrtou16(cur, 10, &np->remote_port))
981 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800982 cur = delim;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983 }
984 cur++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 /* dst ip */
987 if ((delim = strchr(cur, '/')) == NULL)
988 goto parse_failed;
David S. Millerc68b9072006-11-14 20:40:49 -0800989 *delim = 0;
Cong Wangb7394d22013-01-07 20:52:39 +0000990 ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip);
991 if (ipv6 < 0)
992 goto parse_failed;
993 else if (np->ipv6 != (bool)ipv6)
994 goto parse_failed;
995 else
996 np->ipv6 = (bool)ipv6;
David S. Millerc68b9072006-11-14 20:40:49 -0800997 cur = delim + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
David S. Millerc68b9072006-11-14 20:40:49 -0800999 if (*cur != 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000 /* MAC address */
Alexey Dobriyan4940fc82011-05-07 23:00:07 +00001001 if (!mac_pton(cur, np->remote_mac))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 goto parse_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 }
1004
Satyam Sharma0bcc1812007-08-10 15:35:05 -07001005 netpoll_print_options(np);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006
1007 return 0;
1008
1009 parse_failed:
Joe Perchese6ec269352012-01-29 15:50:43 +00001010 np_info(np, "couldn't parse config at '%s'!\n", cur);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 return -1;
1012}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001013EXPORT_SYMBOL(netpoll_parse_options);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001014
Amerigo Wang47be03a22012-08-10 01:24:37 +00001015int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp)
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001016{
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001017 struct netpoll_info *npinfo;
1018 const struct net_device_ops *ops;
1019 unsigned long flags;
1020 int err;
1021
Jiri Pirko30fdd8a02012-07-17 05:22:35 +00001022 np->dev = ndev;
1023 strlcpy(np->dev_name, ndev->name, IFNAMSIZ);
Neil Horman2cde6ac2013-02-11 10:25:30 +00001024 INIT_WORK(&np->cleanup_work, netpoll_async_cleanup);
Jiri Pirko30fdd8a02012-07-17 05:22:35 +00001025
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001026 if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) ||
1027 !ndev->netdev_ops->ndo_poll_controller) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001028 np_err(np, "%s doesn't support polling, aborting\n",
1029 np->dev_name);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001030 err = -ENOTSUPP;
1031 goto out;
1032 }
1033
1034 if (!ndev->npinfo) {
Amerigo Wang47be03a22012-08-10 01:24:37 +00001035 npinfo = kmalloc(sizeof(*npinfo), gfp);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001036 if (!npinfo) {
1037 err = -ENOMEM;
1038 goto out;
1039 }
1040
1041 npinfo->rx_flags = 0;
1042 INIT_LIST_HEAD(&npinfo->rx_np);
1043
1044 spin_lock_init(&npinfo->rx_lock);
Neil Hormanbd7c4b62013-04-30 05:35:05 +00001045 sema_init(&npinfo->dev_lock, 1);
Cong Wangb7394d22013-01-07 20:52:39 +00001046 skb_queue_head_init(&npinfo->neigh_tx);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001047 skb_queue_head_init(&npinfo->txq);
1048 INIT_DELAYED_WORK(&npinfo->tx_work, queue_process);
1049
1050 atomic_set(&npinfo->refcnt, 1);
1051
1052 ops = np->dev->netdev_ops;
1053 if (ops->ndo_netpoll_setup) {
Amerigo Wang47be03a22012-08-10 01:24:37 +00001054 err = ops->ndo_netpoll_setup(ndev, npinfo, gfp);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001055 if (err)
1056 goto free_npinfo;
1057 }
1058 } else {
Neil Horman0790bbb2013-02-11 10:25:31 +00001059 npinfo = rtnl_dereference(ndev->npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001060 atomic_inc(&npinfo->refcnt);
1061 }
1062
1063 npinfo->netpoll = np;
1064
1065 if (np->rx_hook) {
1066 spin_lock_irqsave(&npinfo->rx_lock, flags);
1067 npinfo->rx_flags |= NETPOLL_RX_ENABLED;
1068 list_add_tail(&np->rx, &npinfo->rx_np);
1069 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
1070 }
1071
1072 /* last thing to do is link it to the net device structure */
Eric Dumazetcf778b02012-01-12 04:41:32 +00001073 rcu_assign_pointer(ndev->npinfo, npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001074
1075 return 0;
1076
1077free_npinfo:
1078 kfree(npinfo);
1079out:
1080 return err;
1081}
1082EXPORT_SYMBOL_GPL(__netpoll_setup);
1083
Linus Torvalds1da177e2005-04-16 15:20:36 -07001084int netpoll_setup(struct netpoll *np)
1085{
1086 struct net_device *ndev = NULL;
1087 struct in_device *in_dev;
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001088 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089
Cong Wangf92d3182013-01-14 23:34:06 +00001090 rtnl_lock();
Cong Wang556e6252013-01-27 15:55:21 +00001091 if (np->dev_name) {
1092 struct net *net = current->nsproxy->net_ns;
1093 ndev = __dev_get_by_name(net, np->dev_name);
1094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 if (!ndev) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001096 np_err(np, "%s doesn't exist, aborting\n", np->dev_name);
Cong Wangf92d3182013-01-14 23:34:06 +00001097 err = -ENODEV;
1098 goto unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 }
Cong Wang5bd30d32013-01-17 12:21:08 +08001100 dev_hold(ndev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101
Jiri Pirko49bd8fb02013-01-03 22:48:55 +00001102 if (netdev_master_upper_dev_get(ndev)) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001103 np_err(np, "%s is a slave device, aborting\n", np->dev_name);
Dan Carpenter83fe32d2011-06-11 18:55:22 -07001104 err = -EBUSY;
1105 goto put;
WANG Cong0c1ad042011-06-09 00:28:13 -07001106 }
1107
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108 if (!netif_running(ndev)) {
1109 unsigned long atmost, atleast;
1110
Joe Perchese6ec269352012-01-29 15:50:43 +00001111 np_info(np, "device %s not up yet, forcing it\n", np->dev_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001113 err = dev_open(ndev);
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001114
1115 if (err) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001116 np_err(np, "failed to open %s\n", ndev->name);
Herbert Xudbaa1542010-06-10 16:12:46 +00001117 goto put;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001118 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119
Cong Wangf92d3182013-01-14 23:34:06 +00001120 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121 atleast = jiffies + HZ/10;
Anton Vorontsovbff38772009-07-08 11:10:56 -07001122 atmost = jiffies + carrier_timeout * HZ;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001123 while (!netif_carrier_ok(ndev)) {
1124 if (time_after(jiffies, atmost)) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001125 np_notice(np, "timeout waiting for carrier\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 break;
1127 }
Anton Vorontsov1b614fb2009-07-08 20:09:44 -07001128 msleep(1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129 }
1130
1131 /* If carrier appears to come up instantly, we don't
1132 * trust it and pause so that we don't pump all our
1133 * queued console messages into the bitbucket.
1134 */
1135
1136 if (time_before(jiffies, atleast)) {
Joe Perchese6ec269352012-01-29 15:50:43 +00001137 np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138 msleep(4000);
1139 }
Cong Wangf92d3182013-01-14 23:34:06 +00001140 rtnl_lock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001141 }
1142
Cong Wangb7394d22013-01-07 20:52:39 +00001143 if (!np->local_ip.ip) {
1144 if (!np->ipv6) {
Cong Wangf92d3182013-01-14 23:34:06 +00001145 in_dev = __in_dev_get_rtnl(ndev);
Cong Wangb7394d22013-01-07 20:52:39 +00001146
1147 if (!in_dev || !in_dev->ifa_list) {
Cong Wangb7394d22013-01-07 20:52:39 +00001148 np_err(np, "no IP address for %s, aborting\n",
1149 np->dev_name);
1150 err = -EDESTADDRREQ;
1151 goto put;
1152 }
1153
1154 np->local_ip.ip = in_dev->ifa_list->ifa_local;
Cong Wangb7394d22013-01-07 20:52:39 +00001155 np_info(np, "local IP %pI4\n", &np->local_ip.ip);
Cong Wangb3d936f2013-01-07 20:52:41 +00001156 } else {
1157#if IS_ENABLED(CONFIG_IPV6)
1158 struct inet6_dev *idev;
1159
1160 err = -EDESTADDRREQ;
Cong Wangb3d936f2013-01-07 20:52:41 +00001161 idev = __in6_dev_get(ndev);
1162 if (idev) {
1163 struct inet6_ifaddr *ifp;
1164
1165 read_lock_bh(&idev->lock);
1166 list_for_each_entry(ifp, &idev->addr_list, if_list) {
1167 if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL)
1168 continue;
1169 np->local_ip.in6 = ifp->addr;
1170 err = 0;
1171 break;
1172 }
1173 read_unlock_bh(&idev->lock);
1174 }
Cong Wangb3d936f2013-01-07 20:52:41 +00001175 if (err) {
1176 np_err(np, "no IPv6 address for %s, aborting\n",
1177 np->dev_name);
1178 goto put;
1179 } else
1180 np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6);
1181#else
1182 np_err(np, "IPv6 is not supported %s, aborting\n",
1183 np->dev_name);
Cong Wange39363a2013-01-22 17:39:11 +00001184 err = -EINVAL;
Cong Wangb3d936f2013-01-07 20:52:41 +00001185 goto put;
1186#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 }
1189
Herbert Xudbaa1542010-06-10 16:12:46 +00001190 /* fill up the skb queue */
1191 refill_skbs();
1192
Amerigo Wang47be03a22012-08-10 01:24:37 +00001193 err = __netpoll_setup(np, ndev, GFP_KERNEL);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001194 if (err)
1195 goto put;
1196
Cong Wangf92d3182013-01-14 23:34:06 +00001197 rtnl_unlock();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 return 0;
1199
Jiri Slaby21edbb22010-03-16 05:29:54 +00001200put:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 dev_put(ndev);
Cong Wangf92d3182013-01-14 23:34:06 +00001202unlock:
1203 rtnl_unlock();
Stephen Hemmingerb41848b2006-10-26 15:46:52 -07001204 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001205}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001206EXPORT_SYMBOL(netpoll_setup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207
David S. Millerc68b9072006-11-14 20:40:49 -08001208static int __init netpoll_init(void)
1209{
Stephen Hemmingera1bcfac2006-11-14 10:43:58 -08001210 skb_queue_head_init(&skb_pool);
1211 return 0;
1212}
1213core_initcall(netpoll_init);
1214
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001215static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head)
1216{
1217 struct netpoll_info *npinfo =
1218 container_of(rcu_head, struct netpoll_info, rcu);
1219
Cong Wangb7394d22013-01-07 20:52:39 +00001220 skb_queue_purge(&npinfo->neigh_tx);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001221 skb_queue_purge(&npinfo->txq);
1222
1223 /* we can't call cancel_delayed_work_sync here, as we are in softirq */
1224 cancel_delayed_work(&npinfo->tx_work);
1225
1226 /* clean after last, unfinished work */
1227 __skb_queue_purge(&npinfo->txq);
1228 /* now cancel it again */
1229 cancel_delayed_work(&npinfo->tx_work);
1230 kfree(npinfo);
1231}
1232
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001233void __netpoll_cleanup(struct netpoll *np)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001234{
Jeff Moyerfbeec2e2005-06-22 22:05:59 -07001235 struct netpoll_info *npinfo;
1236 unsigned long flags;
1237
Neil Horman0790bbb2013-02-11 10:25:31 +00001238 /* rtnl_dereference would be preferable here but
1239 * rcu_cleanup_netpoll path can put us in here safely without
1240 * holding the rtnl, so plain rcu_dereference it is
1241 */
1242 npinfo = rtnl_dereference(np->dev->npinfo);
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001243 if (!npinfo)
Herbert Xudbaa1542010-06-10 16:12:46 +00001244 return;
Stephen Hemminger93ec2c72006-10-26 15:46:50 -07001245
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001246 if (!list_empty(&npinfo->rx_np)) {
1247 spin_lock_irqsave(&npinfo->rx_lock, flags);
1248 list_del(&np->rx);
1249 if (list_empty(&npinfo->rx_np))
1250 npinfo->rx_flags &= ~NETPOLL_RX_ENABLED;
1251 spin_unlock_irqrestore(&npinfo->rx_lock, flags);
Jeff Moyer115c1d62005-06-22 22:05:31 -07001252 }
Herbert Xudbaa1542010-06-10 16:12:46 +00001253
Neil Hormanca99ca12013-02-05 08:05:43 +00001254 synchronize_srcu(&netpoll_srcu);
1255
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001256 if (atomic_dec_and_test(&npinfo->refcnt)) {
1257 const struct net_device_ops *ops;
1258
1259 ops = np->dev->netdev_ops;
1260 if (ops->ndo_netpoll_cleanup)
1261 ops->ndo_netpoll_cleanup(np->dev);
1262
Neil Horman2cde6ac2013-02-11 10:25:30 +00001263 rcu_assign_pointer(np->dev->npinfo, NULL);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001264 call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info);
Herbert Xudbaa1542010-06-10 16:12:46 +00001265 }
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001266}
1267EXPORT_SYMBOL_GPL(__netpoll_cleanup);
1268
Neil Horman2cde6ac2013-02-11 10:25:30 +00001269static void netpoll_async_cleanup(struct work_struct *work)
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001270{
Neil Horman2cde6ac2013-02-11 10:25:30 +00001271 struct netpoll *np = container_of(work, struct netpoll, cleanup_work);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001272
Neil Horman2cde6ac2013-02-11 10:25:30 +00001273 rtnl_lock();
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001274 __netpoll_cleanup(np);
Neil Horman2cde6ac2013-02-11 10:25:30 +00001275 rtnl_unlock();
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001276 kfree(np);
1277}
1278
Neil Horman2cde6ac2013-02-11 10:25:30 +00001279void __netpoll_free_async(struct netpoll *np)
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001280{
Neil Horman2cde6ac2013-02-11 10:25:30 +00001281 schedule_work(&np->cleanup_work);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001282}
Neil Horman2cde6ac2013-02-11 10:25:30 +00001283EXPORT_SYMBOL_GPL(__netpoll_free_async);
Amerigo Wang38e6bc12012-08-10 01:24:38 +00001284
Herbert Xu8fdd95e2010-06-10 16:12:48 +00001285void netpoll_cleanup(struct netpoll *np)
1286{
1287 if (!np->dev)
1288 return;
1289
1290 rtnl_lock();
1291 __netpoll_cleanup(np);
1292 rtnl_unlock();
Herbert Xudbaa1542010-06-10 16:12:46 +00001293
1294 dev_put(np->dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001295 np->dev = NULL;
1296}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001297EXPORT_SYMBOL(netpoll_cleanup);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001298
1299int netpoll_trap(void)
1300{
1301 return atomic_read(&trapped);
1302}
Eric Dumazet9e34a5b2010-07-09 21:22:04 +00001303EXPORT_SYMBOL(netpoll_trap);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304
1305void netpoll_set_trap(int trap)
1306{
1307 if (trap)
1308 atomic_inc(&trapped);
1309 else
1310 atomic_dec(&trapped);
1311}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001312EXPORT_SYMBOL(netpoll_set_trap);