Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
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 | ||
e6ec2693 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
bff38771 | 14 | #include <linux/moduleparam.h> |
1da177e4 LT |
15 | #include <linux/netdevice.h> |
16 | #include <linux/etherdevice.h> | |
17 | #include <linux/string.h> | |
14c85021 | 18 | #include <linux/if_arp.h> |
1da177e4 LT |
19 | #include <linux/inetdevice.h> |
20 | #include <linux/inet.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/netpoll.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/rcupdate.h> | |
26 | #include <linux/workqueue.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
bc3b2d7f | 28 | #include <linux/export.h> |
689971b4 | 29 | #include <linux/if_vlan.h> |
1da177e4 LT |
30 | #include <net/tcp.h> |
31 | #include <net/udp.h> | |
b3d936f3 CW |
32 | #include <net/addrconf.h> |
33 | #include <net/ndisc.h> | |
34 | #include <net/ip6_checksum.h> | |
1da177e4 | 35 | #include <asm/unaligned.h> |
9cbc1cb8 | 36 | #include <trace/events/napi.h> |
1da177e4 LT |
37 | |
38 | /* | |
39 | * We maintain a small pool of fully-sized skbs, to make sure the | |
40 | * message gets out even in extreme OOM situations. | |
41 | */ | |
42 | ||
43 | #define MAX_UDP_CHUNK 1460 | |
44 | #define MAX_SKBS 32 | |
1da177e4 | 45 | |
a1bcfacd | 46 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
47 | |
48 | static atomic_t trapped; | |
49 | ||
ca99ca14 NH |
50 | static struct srcu_struct netpoll_srcu; |
51 | ||
2bdfe0ba | 52 | #define USEC_PER_POLL 50 |
d9452e9f DM |
53 | #define NETPOLL_RX_ENABLED 1 |
54 | #define NETPOLL_RX_DROP 2 | |
1da177e4 | 55 | |
6f706245 JP |
56 | #define MAX_SKB_SIZE \ |
57 | (sizeof(struct ethhdr) + \ | |
58 | sizeof(struct iphdr) + \ | |
59 | sizeof(struct udphdr) + \ | |
60 | MAX_UDP_CHUNK) | |
1da177e4 | 61 | |
3578b0c8 | 62 | static void zap_completion_queue(void); |
b7394d24 | 63 | static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo); |
2cde6acd | 64 | static void netpoll_async_cleanup(struct work_struct *work); |
1da177e4 | 65 | |
bff38771 AV |
66 | static unsigned int carrier_timeout = 4; |
67 | module_param(carrier_timeout, uint, 0644); | |
68 | ||
e6ec2693 JP |
69 | #define np_info(np, fmt, ...) \ |
70 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
71 | #define np_err(np, fmt, ...) \ | |
72 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
73 | #define np_notice(np, fmt, ...) \ | |
74 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
75 | ||
c4028958 | 76 | static void queue_process(struct work_struct *work) |
1da177e4 | 77 | { |
4c1ac1b4 DH |
78 | struct netpoll_info *npinfo = |
79 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 80 | struct sk_buff *skb; |
3640543d | 81 | unsigned long flags; |
1da177e4 | 82 | |
6c43ff18 SH |
83 | while ((skb = skb_dequeue(&npinfo->txq))) { |
84 | struct net_device *dev = skb->dev; | |
00829823 | 85 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 86 | struct netdev_queue *txq; |
1da177e4 | 87 | |
6c43ff18 SH |
88 | if (!netif_device_present(dev) || !netif_running(dev)) { |
89 | __kfree_skb(skb); | |
90 | continue; | |
91 | } | |
1da177e4 | 92 | |
fd2ea0a7 DM |
93 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
94 | ||
3640543d | 95 | local_irq_save(flags); |
fd2ea0a7 | 96 | __netif_tx_lock(txq, smp_processor_id()); |
73466498 | 97 | if (netif_xmit_frozen_or_stopped(txq) || |
00829823 | 98 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 99 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 100 | __netif_tx_unlock(txq); |
3640543d | 101 | local_irq_restore(flags); |
1da177e4 | 102 | |
25442caf | 103 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
104 | return; |
105 | } | |
fd2ea0a7 | 106 | __netif_tx_unlock(txq); |
3640543d | 107 | local_irq_restore(flags); |
1da177e4 | 108 | } |
1da177e4 LT |
109 | } |
110 | ||
b51655b9 AV |
111 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
112 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 113 | { |
d6f5493c | 114 | __wsum psum; |
fb286bb2 | 115 | |
60476372 | 116 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
117 | return 0; |
118 | ||
fb286bb2 HX |
119 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
120 | ||
84fa7933 | 121 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 122 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 123 | return 0; |
1da177e4 | 124 | |
fb286bb2 | 125 | skb->csum = psum; |
1da177e4 | 126 | |
fb286bb2 | 127 | return __skb_checksum_complete(skb); |
1da177e4 LT |
128 | } |
129 | ||
130 | /* | |
131 | * Check whether delayed processing was scheduled for our NIC. If so, | |
132 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
133 | * If this fails, either we've recursed in ->poll() or it's already | |
134 | * running on another CPU. | |
135 | * | |
136 | * Note: we don't mask interrupts with this lock because we're using | |
137 | * trylock here and interrupts are already disabled in the softirq | |
138 | * case. Further, we test the poll_owner to avoid recursion on UP | |
139 | * systems where the lock doesn't exist. | |
140 | * | |
141 | * In cases where there is bi-directional communications, reading only | |
142 | * one message at a time can lead to packets being dropped by the | |
143 | * network adapter, forcing superfluous retries and possibly timeouts. | |
144 | * Thus, we set our budget to greater than 1. | |
145 | */ | |
0a7606c1 DM |
146 | static int poll_one_napi(struct netpoll_info *npinfo, |
147 | struct napi_struct *napi, int budget) | |
148 | { | |
149 | int work; | |
150 | ||
151 | /* net_rx_action's ->poll() invocations and our's are | |
152 | * synchronized by this test which is only made while | |
153 | * holding the napi->poll_lock. | |
154 | */ | |
155 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
156 | return budget; | |
157 | ||
d9452e9f | 158 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 159 | atomic_inc(&trapped); |
7b363e44 | 160 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
161 | |
162 | work = napi->poll(napi, budget); | |
7d18f114 | 163 | trace_napi_poll(napi); |
0a7606c1 | 164 | |
7b363e44 | 165 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 166 | atomic_dec(&trapped); |
d9452e9f | 167 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
168 | |
169 | return budget - work; | |
170 | } | |
171 | ||
5106930b | 172 | static void poll_napi(struct net_device *dev) |
1da177e4 | 173 | { |
bea3348e | 174 | struct napi_struct *napi; |
1da177e4 LT |
175 | int budget = 16; |
176 | ||
f13d493d | 177 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 178 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 179 | spin_trylock(&napi->poll_lock)) { |
2899656b AW |
180 | budget = poll_one_napi(rcu_dereference_bh(dev->npinfo), |
181 | napi, budget); | |
bea3348e | 182 | spin_unlock(&napi->poll_lock); |
0a7606c1 | 183 | |
072a9c48 | 184 | if (!budget) |
0a7606c1 | 185 | break; |
bea3348e | 186 | } |
1da177e4 LT |
187 | } |
188 | } | |
189 | ||
b7394d24 | 190 | static void service_neigh_queue(struct netpoll_info *npi) |
068c6e98 | 191 | { |
5106930b SH |
192 | if (npi) { |
193 | struct sk_buff *skb; | |
068c6e98 | 194 | |
b7394d24 CW |
195 | while ((skb = skb_dequeue(&npi->neigh_tx))) |
196 | netpoll_neigh_reply(skb, npi); | |
068c6e98 | 197 | } |
068c6e98 NH |
198 | } |
199 | ||
234b921d | 200 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 201 | { |
5e392739 | 202 | const struct net_device_ops *ops; |
2899656b | 203 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
5106930b | 204 | |
ca99ca14 NH |
205 | /* Don't do any rx activity if the dev_lock mutex is held |
206 | * the dev_open/close paths use this to block netpoll activity | |
207 | * while changing device state | |
208 | */ | |
0790bbb6 | 209 | if (!mutex_trylock(&ni->dev_lock)) |
ca99ca14 NH |
210 | return; |
211 | ||
959d5fde NH |
212 | if (!netif_running(dev)) { |
213 | mutex_unlock(&ni->dev_lock); | |
5e392739 | 214 | return; |
959d5fde | 215 | } |
5e392739 PE |
216 | |
217 | ops = dev->netdev_ops; | |
959d5fde NH |
218 | if (!ops->ndo_poll_controller) { |
219 | mutex_unlock(&ni->dev_lock); | |
1da177e4 | 220 | return; |
959d5fde | 221 | } |
1da177e4 LT |
222 | |
223 | /* Process pending work on NIC */ | |
d314774c | 224 | ops->ndo_poll_controller(dev); |
5106930b SH |
225 | |
226 | poll_napi(dev); | |
1da177e4 | 227 | |
0790bbb6 | 228 | mutex_unlock(&ni->dev_lock); |
ca99ca14 | 229 | |
58e05f35 | 230 | if (dev->flags & IFF_SLAVE) { |
2899656b | 231 | if (ni) { |
49bd8fb0 | 232 | struct net_device *bond_dev; |
5a698af5 | 233 | struct sk_buff *skb; |
49bd8fb0 JP |
234 | struct netpoll_info *bond_ni; |
235 | ||
236 | bond_dev = netdev_master_upper_dev_get_rcu(dev); | |
237 | bond_ni = rcu_dereference_bh(bond_dev->npinfo); | |
b7394d24 | 238 | while ((skb = skb_dequeue(&ni->neigh_tx))) { |
5a698af5 | 239 | skb->dev = bond_dev; |
b7394d24 | 240 | skb_queue_tail(&bond_ni->neigh_tx, skb); |
5a698af5 AW |
241 | } |
242 | } | |
243 | } | |
244 | ||
b7394d24 | 245 | service_neigh_queue(ni); |
068c6e98 | 246 | |
3578b0c8 | 247 | zap_completion_queue(); |
1da177e4 LT |
248 | } |
249 | ||
ca99ca14 NH |
250 | int netpoll_rx_disable(struct net_device *dev) |
251 | { | |
252 | struct netpoll_info *ni; | |
253 | int idx; | |
254 | might_sleep(); | |
255 | idx = srcu_read_lock(&netpoll_srcu); | |
256 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
257 | if (ni) | |
258 | mutex_lock(&ni->dev_lock); | |
259 | srcu_read_unlock(&netpoll_srcu, idx); | |
260 | return 0; | |
261 | } | |
262 | EXPORT_SYMBOL(netpoll_rx_disable); | |
263 | ||
264 | void 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) | |
270 | mutex_unlock(&ni->dev_lock); | |
271 | rcu_read_unlock(); | |
272 | } | |
273 | EXPORT_SYMBOL(netpoll_rx_enable); | |
274 | ||
1da177e4 LT |
275 | static void refill_skbs(void) |
276 | { | |
277 | struct sk_buff *skb; | |
278 | unsigned long flags; | |
279 | ||
a1bcfacd SH |
280 | spin_lock_irqsave(&skb_pool.lock, flags); |
281 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
282 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
283 | if (!skb) | |
284 | break; | |
285 | ||
a1bcfacd | 286 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 287 | } |
a1bcfacd | 288 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
289 | } |
290 | ||
3578b0c8 DM |
291 | static 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 | ||
a1bcfacd | 319 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 320 | { |
a1bcfacd SH |
321 | int count = 0; |
322 | struct sk_buff *skb; | |
1da177e4 | 323 | |
3578b0c8 | 324 | zap_completion_queue(); |
a1bcfacd | 325 | refill_skbs(); |
1da177e4 | 326 | repeat: |
1da177e4 LT |
327 | |
328 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
329 | if (!skb) |
330 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
331 | |
332 | if (!skb) { | |
a1bcfacd | 333 | if (++count < 10) { |
2a49e001 | 334 | netpoll_poll_dev(np->dev); |
a1bcfacd | 335 | goto repeat; |
1da177e4 | 336 | } |
a1bcfacd | 337 | return NULL; |
1da177e4 LT |
338 | } |
339 | ||
340 | atomic_set(&skb->users, 1); | |
341 | skb_reserve(skb, reserve); | |
342 | return skb; | |
343 | } | |
344 | ||
bea3348e SH |
345 | static 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 | ||
2899656b | 356 | /* call with IRQ disabled */ |
c2355e1a NH |
357 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
358 | struct net_device *dev) | |
1da177e4 | 359 | { |
2bdfe0ba SH |
360 | int status = NETDEV_TX_BUSY; |
361 | unsigned long tries; | |
00829823 | 362 | const struct net_device_ops *ops = dev->netdev_ops; |
de85d99e | 363 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 364 | struct netpoll_info *npinfo; |
2bdfe0ba | 365 | |
2899656b AW |
366 | WARN_ON_ONCE(!irqs_disabled()); |
367 | ||
368 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb YH |
369 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
370 | __kfree_skb(skb); | |
371 | return; | |
372 | } | |
2bdfe0ba SH |
373 | |
374 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 375 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 376 | struct netdev_queue *txq; |
a49f99ff | 377 | |
8c4c49df | 378 | txq = netdev_pick_tx(dev, skb); |
fd2ea0a7 | 379 | |
0db3dc73 SH |
380 | /* try until next clock tick */ |
381 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
382 | tries > 0; --tries) { | |
fd2ea0a7 | 383 | if (__netif_tx_trylock(txq)) { |
73466498 | 384 | if (!netif_xmit_stopped(txq)) { |
689971b4 AW |
385 | if (vlan_tx_tag_present(skb) && |
386 | !(netif_skb_features(skb) & NETIF_F_HW_VLAN_TX)) { | |
387 | skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb)); | |
388 | if (unlikely(!skb)) | |
389 | break; | |
390 | skb->vlan_tci = 0; | |
391 | } | |
392 | ||
00829823 | 393 | status = ops->ndo_start_xmit(skb, dev); |
08baf561 ED |
394 | if (status == NETDEV_TX_OK) |
395 | txq_trans_update(txq); | |
396 | } | |
fd2ea0a7 | 397 | __netif_tx_unlock(txq); |
e37b8d93 AM |
398 | |
399 | if (status == NETDEV_TX_OK) | |
400 | break; | |
401 | ||
e37b8d93 | 402 | } |
0db3dc73 SH |
403 | |
404 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 405 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
406 | |
407 | udelay(USEC_PER_POLL); | |
0db1d6fc | 408 | } |
79b1bee8 DD |
409 | |
410 | WARN_ONCE(!irqs_disabled(), | |
2899656b | 411 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
79b1bee8 DD |
412 | dev->name, ops->ndo_start_xmit); |
413 | ||
1da177e4 | 414 | } |
1da177e4 | 415 | |
2bdfe0ba | 416 | if (status != NETDEV_TX_OK) { |
5de4a473 | 417 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 418 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 419 | } |
1da177e4 | 420 | } |
c2355e1a | 421 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
422 | |
423 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
424 | { | |
954fba02 | 425 | int total_len, ip_len, udp_len; |
1da177e4 LT |
426 | struct sk_buff *skb; |
427 | struct udphdr *udph; | |
428 | struct iphdr *iph; | |
429 | struct ethhdr *eth; | |
ee130409 | 430 | static atomic_t ip_ident; |
b3d936f3 | 431 | struct ipv6hdr *ip6h; |
1da177e4 LT |
432 | |
433 | udp_len = len + sizeof(*udph); | |
b3d936f3 CW |
434 | if (np->ipv6) |
435 | ip_len = udp_len + sizeof(*ip6h); | |
436 | else | |
b7394d24 CW |
437 | ip_len = udp_len + sizeof(*iph); |
438 | ||
954fba02 | 439 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 440 | |
954fba02 ED |
441 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
442 | total_len - len); | |
1da177e4 LT |
443 | if (!skb) |
444 | return; | |
445 | ||
27d7ff46 | 446 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 447 | skb_put(skb, len); |
1da177e4 | 448 | |
4bedb452 ACM |
449 | skb_push(skb, sizeof(*udph)); |
450 | skb_reset_transport_header(skb); | |
451 | udph = udp_hdr(skb); | |
1da177e4 LT |
452 | udph->source = htons(np->local_port); |
453 | udph->dest = htons(np->remote_port); | |
454 | udph->len = htons(udp_len); | |
b7394d24 | 455 | |
b3d936f3 CW |
456 | if (np->ipv6) { |
457 | udph->check = 0; | |
458 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
459 | &np->remote_ip.in6, | |
460 | udp_len, IPPROTO_UDP, | |
461 | csum_partial(udph, udp_len, 0)); | |
462 | if (udph->check == 0) | |
463 | udph->check = CSUM_MANGLED_0; | |
464 | ||
465 | skb_push(skb, sizeof(*ip6h)); | |
466 | skb_reset_network_header(skb); | |
467 | ip6h = ipv6_hdr(skb); | |
468 | ||
469 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
470 | put_unaligned(0x60, (unsigned char *)ip6h); | |
471 | ip6h->flow_lbl[0] = 0; | |
472 | ip6h->flow_lbl[1] = 0; | |
473 | ip6h->flow_lbl[2] = 0; | |
474 | ||
475 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
476 | ip6h->nexthdr = IPPROTO_UDP; | |
477 | ip6h->hop_limit = 32; | |
478 | ip6h->saddr = np->local_ip.in6; | |
479 | ip6h->daddr = np->remote_ip.in6; | |
480 | ||
481 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
482 | skb_reset_mac_header(skb); | |
483 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
484 | } else { | |
b7394d24 CW |
485 | udph->check = 0; |
486 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
487 | np->remote_ip.ip, | |
488 | udp_len, IPPROTO_UDP, | |
489 | csum_partial(udph, udp_len, 0)); | |
490 | if (udph->check == 0) | |
491 | udph->check = CSUM_MANGLED_0; | |
492 | ||
493 | skb_push(skb, sizeof(*iph)); | |
494 | skb_reset_network_header(skb); | |
495 | iph = ip_hdr(skb); | |
496 | ||
497 | /* iph->version = 4; iph->ihl = 5; */ | |
498 | put_unaligned(0x45, (unsigned char *)iph); | |
499 | iph->tos = 0; | |
500 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
501 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
502 | iph->frag_off = 0; | |
503 | iph->ttl = 64; | |
504 | iph->protocol = IPPROTO_UDP; | |
505 | iph->check = 0; | |
506 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
507 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
508 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
509 | ||
510 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
511 | skb_reset_mac_header(skb); | |
512 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
513 | } | |
514 | ||
09538641 SH |
515 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
516 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
517 | |
518 | skb->dev = np->dev; | |
519 | ||
520 | netpoll_send_skb(np, skb); | |
521 | } | |
9e34a5b5 | 522 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 523 | |
b7394d24 | 524 | static void netpoll_neigh_reply(struct sk_buff *skb, struct netpoll_info *npinfo) |
1da177e4 | 525 | { |
b3d936f3 | 526 | int size, type = ARPOP_REPLY; |
252e3346 | 527 | __be32 sip, tip; |
47bbec02 | 528 | unsigned char *sha; |
1da177e4 | 529 | struct sk_buff *send_skb; |
508e14b4 DB |
530 | struct netpoll *np, *tmp; |
531 | unsigned long flags; | |
ae641949 | 532 | int hlen, tlen; |
b7394d24 | 533 | int hits = 0, proto; |
508e14b4 DB |
534 | |
535 | if (list_empty(&npinfo->rx_np)) | |
536 | return; | |
537 | ||
538 | /* Before checking the packet, we do some early | |
539 | inspection whether this is interesting at all */ | |
540 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
541 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
542 | if (np->dev == skb->dev) | |
543 | hits++; | |
544 | } | |
545 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 546 | |
508e14b4 DB |
547 | /* No netpoll struct is using this dev */ |
548 | if (!hits) | |
115c1d6e | 549 | return; |
1da177e4 | 550 | |
b7394d24 CW |
551 | proto = ntohs(eth_hdr(skb)->h_proto); |
552 | if (proto == ETH_P_IP) { | |
b3d936f3 CW |
553 | struct arphdr *arp; |
554 | unsigned char *arp_ptr; | |
b7394d24 CW |
555 | /* No arp on this interface */ |
556 | if (skb->dev->flags & IFF_NOARP) | |
557 | return; | |
1da177e4 | 558 | |
b7394d24 CW |
559 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
560 | return; | |
1da177e4 | 561 | |
b7394d24 CW |
562 | skb_reset_network_header(skb); |
563 | skb_reset_transport_header(skb); | |
564 | arp = arp_hdr(skb); | |
1da177e4 | 565 | |
b7394d24 CW |
566 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
567 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
568 | arp->ar_pro != htons(ETH_P_IP) || | |
569 | arp->ar_op != htons(ARPOP_REQUEST)) | |
570 | return; | |
1da177e4 | 571 | |
b7394d24 CW |
572 | arp_ptr = (unsigned char *)(arp+1); |
573 | /* save the location of the src hw addr */ | |
574 | sha = arp_ptr; | |
575 | arp_ptr += skb->dev->addr_len; | |
576 | memcpy(&sip, arp_ptr, 4); | |
577 | arp_ptr += 4; | |
578 | /* If we actually cared about dst hw addr, | |
579 | it would get copied here */ | |
580 | arp_ptr += skb->dev->addr_len; | |
581 | memcpy(&tip, arp_ptr, 4); | |
1da177e4 | 582 | |
b7394d24 CW |
583 | /* Should we ignore arp? */ |
584 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) | |
585 | return; | |
1da177e4 | 586 | |
b7394d24 | 587 | size = arp_hdr_len(skb->dev); |
1da177e4 | 588 | |
b7394d24 CW |
589 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
590 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
591 | if (tip != np->local_ip.ip) | |
592 | continue; | |
593 | ||
594 | hlen = LL_RESERVED_SPACE(np->dev); | |
595 | tlen = np->dev->needed_tailroom; | |
596 | send_skb = find_skb(np, size + hlen + tlen, hlen); | |
597 | if (!send_skb) | |
598 | continue; | |
599 | ||
600 | skb_reset_network_header(send_skb); | |
601 | arp = (struct arphdr *) skb_put(send_skb, size); | |
602 | send_skb->dev = skb->dev; | |
603 | send_skb->protocol = htons(ETH_P_ARP); | |
604 | ||
605 | /* Fill the device header for the ARP frame */ | |
b3d936f3 | 606 | if (dev_hard_header(send_skb, skb->dev, ETH_P_ARP, |
b7394d24 CW |
607 | sha, np->dev->dev_addr, |
608 | send_skb->len) < 0) { | |
609 | kfree_skb(send_skb); | |
610 | continue; | |
611 | } | |
1da177e4 | 612 | |
b7394d24 CW |
613 | /* |
614 | * Fill out the arp protocol part. | |
615 | * | |
616 | * we only support ethernet device type, | |
617 | * which (according to RFC 1390) should | |
618 | * always equal 1 (Ethernet). | |
619 | */ | |
620 | ||
621 | arp->ar_hrd = htons(np->dev->type); | |
622 | arp->ar_pro = htons(ETH_P_IP); | |
623 | arp->ar_hln = np->dev->addr_len; | |
624 | arp->ar_pln = 4; | |
625 | arp->ar_op = htons(type); | |
626 | ||
627 | arp_ptr = (unsigned char *)(arp + 1); | |
628 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
629 | arp_ptr += np->dev->addr_len; | |
630 | memcpy(arp_ptr, &tip, 4); | |
631 | arp_ptr += 4; | |
632 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
633 | arp_ptr += np->dev->addr_len; | |
634 | memcpy(arp_ptr, &sip, 4); | |
635 | ||
636 | netpoll_send_skb(np, send_skb); | |
637 | ||
638 | /* If there are several rx_hooks for the same address, | |
639 | we're fine by sending a single reply */ | |
640 | break; | |
508e14b4 | 641 | } |
b7394d24 | 642 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
b3d936f3 CW |
643 | } else if( proto == ETH_P_IPV6) { |
644 | #if IS_ENABLED(CONFIG_IPV6) | |
645 | struct nd_msg *msg; | |
646 | u8 *lladdr = NULL; | |
647 | struct ipv6hdr *hdr; | |
648 | struct icmp6hdr *icmp6h; | |
649 | const struct in6_addr *saddr; | |
650 | const struct in6_addr *daddr; | |
651 | struct inet6_dev *in6_dev = NULL; | |
652 | struct in6_addr *target; | |
653 | ||
654 | in6_dev = in6_dev_get(skb->dev); | |
655 | if (!in6_dev || !in6_dev->cnf.accept_ra) | |
656 | return; | |
657 | ||
658 | if (!pskb_may_pull(skb, skb->len)) | |
659 | return; | |
660 | ||
661 | msg = (struct nd_msg *)skb_transport_header(skb); | |
662 | ||
663 | __skb_push(skb, skb->data - skb_transport_header(skb)); | |
664 | ||
665 | if (ipv6_hdr(skb)->hop_limit != 255) | |
666 | return; | |
667 | if (msg->icmph.icmp6_code != 0) | |
668 | return; | |
669 | if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION) | |
670 | return; | |
671 | ||
672 | saddr = &ipv6_hdr(skb)->saddr; | |
673 | daddr = &ipv6_hdr(skb)->daddr; | |
674 | ||
675 | size = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); | |
676 | ||
677 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
678 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
faeed828 | 679 | if (!ipv6_addr_equal(daddr, &np->local_ip.in6)) |
b3d936f3 CW |
680 | continue; |
681 | ||
682 | hlen = LL_RESERVED_SPACE(np->dev); | |
683 | tlen = np->dev->needed_tailroom; | |
684 | send_skb = find_skb(np, size + hlen + tlen, hlen); | |
685 | if (!send_skb) | |
686 | continue; | |
687 | ||
688 | send_skb->protocol = htons(ETH_P_IPV6); | |
689 | send_skb->dev = skb->dev; | |
690 | ||
691 | skb_reset_network_header(send_skb); | |
692 | skb_put(send_skb, sizeof(struct ipv6hdr)); | |
693 | hdr = ipv6_hdr(send_skb); | |
694 | ||
695 | *(__be32*)hdr = htonl(0x60000000); | |
696 | ||
697 | hdr->payload_len = htons(size); | |
698 | hdr->nexthdr = IPPROTO_ICMPV6; | |
699 | hdr->hop_limit = 255; | |
700 | hdr->saddr = *saddr; | |
701 | hdr->daddr = *daddr; | |
702 | ||
703 | send_skb->transport_header = send_skb->tail; | |
704 | skb_put(send_skb, size); | |
705 | ||
706 | icmp6h = (struct icmp6hdr *)skb_transport_header(skb); | |
707 | icmp6h->icmp6_type = NDISC_NEIGHBOUR_ADVERTISEMENT; | |
708 | icmp6h->icmp6_router = 0; | |
709 | icmp6h->icmp6_solicited = 1; | |
959d5fde | 710 | target = (struct in6_addr *)(skb_transport_header(send_skb) + sizeof(struct icmp6hdr)); |
b3d936f3 CW |
711 | *target = msg->target; |
712 | icmp6h->icmp6_cksum = csum_ipv6_magic(saddr, daddr, size, | |
713 | IPPROTO_ICMPV6, | |
714 | csum_partial(icmp6h, | |
715 | size, 0)); | |
716 | ||
717 | if (dev_hard_header(send_skb, skb->dev, ETH_P_IPV6, | |
718 | lladdr, np->dev->dev_addr, | |
719 | send_skb->len) < 0) { | |
720 | kfree_skb(send_skb); | |
721 | continue; | |
722 | } | |
723 | ||
724 | netpoll_send_skb(np, send_skb); | |
725 | ||
726 | /* If there are several rx_hooks for the same address, | |
727 | we're fine by sending a single reply */ | |
728 | break; | |
729 | } | |
730 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
731 | #endif | |
508e14b4 | 732 | } |
1da177e4 LT |
733 | } |
734 | ||
b3d936f3 CW |
735 | static bool pkt_is_ns(struct sk_buff *skb) |
736 | { | |
737 | struct nd_msg *msg; | |
738 | struct ipv6hdr *hdr; | |
739 | ||
740 | if (skb->protocol != htons(ETH_P_ARP)) | |
741 | return false; | |
742 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr) + sizeof(struct nd_msg))) | |
743 | return false; | |
744 | ||
745 | msg = (struct nd_msg *)skb_transport_header(skb); | |
746 | __skb_push(skb, skb->data - skb_transport_header(skb)); | |
747 | hdr = ipv6_hdr(skb); | |
748 | ||
749 | if (hdr->nexthdr != IPPROTO_ICMPV6) | |
750 | return false; | |
751 | if (hdr->hop_limit != 255) | |
752 | return false; | |
753 | if (msg->icmph.icmp6_code != 0) | |
754 | return false; | |
755 | if (msg->icmph.icmp6_type != NDISC_NEIGHBOUR_SOLICITATION) | |
756 | return false; | |
757 | ||
758 | return true; | |
759 | } | |
760 | ||
57c5d461 | 761 | int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) |
1da177e4 LT |
762 | { |
763 | int proto, len, ulen; | |
508e14b4 | 764 | int hits = 0; |
b71d1d42 | 765 | const struct iphdr *iph; |
1da177e4 | 766 | struct udphdr *uh; |
508e14b4 | 767 | struct netpoll *np, *tmp; |
068c6e98 | 768 | |
508e14b4 | 769 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 770 | goto out; |
508e14b4 | 771 | |
1da177e4 LT |
772 | if (skb->dev->type != ARPHRD_ETHER) |
773 | goto out; | |
774 | ||
d9452e9f | 775 | /* check if netpoll clients need ARP */ |
b3d936f3 CW |
776 | if (skb->protocol == htons(ETH_P_ARP) && atomic_read(&trapped)) { |
777 | skb_queue_tail(&npinfo->neigh_tx, skb); | |
778 | return 1; | |
779 | } else if (pkt_is_ns(skb) && atomic_read(&trapped)) { | |
b7394d24 | 780 | skb_queue_tail(&npinfo->neigh_tx, skb); |
1da177e4 LT |
781 | return 1; |
782 | } | |
783 | ||
689971b4 AW |
784 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) { |
785 | skb = vlan_untag(skb); | |
786 | if (unlikely(!skb)) | |
787 | goto out; | |
788 | } | |
789 | ||
1da177e4 | 790 | proto = ntohs(eth_hdr(skb)->h_proto); |
b7394d24 | 791 | if (proto != ETH_P_IP && proto != ETH_P_IPV6) |
1da177e4 LT |
792 | goto out; |
793 | if (skb->pkt_type == PACKET_OTHERHOST) | |
794 | goto out; | |
795 | if (skb_shared(skb)) | |
796 | goto out; | |
797 | ||
b7394d24 CW |
798 | if (proto == ETH_P_IP) { |
799 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
800 | goto out; | |
801 | iph = (struct iphdr *)skb->data; | |
802 | if (iph->ihl < 5 || iph->version != 4) | |
803 | goto out; | |
804 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
805 | goto out; | |
806 | iph = (struct iphdr *)skb->data; | |
807 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
808 | goto out; | |
5e7d7fa5 | 809 | |
b7394d24 CW |
810 | len = ntohs(iph->tot_len); |
811 | if (skb->len < len || len < iph->ihl*4) | |
812 | goto out; | |
1da177e4 | 813 | |
b7394d24 CW |
814 | /* |
815 | * Our transport medium may have padded the buffer out. | |
816 | * Now We trim to the true length of the frame. | |
817 | */ | |
818 | if (pskb_trim_rcsum(skb, len)) | |
819 | goto out; | |
1da177e4 | 820 | |
b7394d24 CW |
821 | iph = (struct iphdr *)skb->data; |
822 | if (iph->protocol != IPPROTO_UDP) | |
823 | goto out; | |
1da177e4 | 824 | |
b7394d24 CW |
825 | len -= iph->ihl*4; |
826 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
827 | ulen = ntohs(uh->len); | |
508e14b4 | 828 | |
b7394d24 CW |
829 | if (ulen != len) |
830 | goto out; | |
831 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) | |
832 | goto out; | |
833 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
834 | if (np->local_ip.ip && np->local_ip.ip != iph->daddr) | |
835 | continue; | |
836 | if (np->remote_ip.ip && np->remote_ip.ip != iph->saddr) | |
837 | continue; | |
838 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
839 | continue; | |
840 | ||
841 | np->rx_hook(np, ntohs(uh->source), | |
842 | (char *)(uh+1), | |
843 | ulen - sizeof(struct udphdr)); | |
844 | hits++; | |
845 | } | |
b3d936f3 CW |
846 | } else { |
847 | #if IS_ENABLED(CONFIG_IPV6) | |
848 | const struct ipv6hdr *ip6h; | |
849 | ||
850 | if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) | |
851 | goto out; | |
852 | ip6h = (struct ipv6hdr *)skb->data; | |
853 | if (ip6h->version != 6) | |
854 | goto out; | |
855 | len = ntohs(ip6h->payload_len); | |
856 | if (!len) | |
857 | goto out; | |
858 | if (len + sizeof(struct ipv6hdr) > skb->len) | |
859 | goto out; | |
860 | if (pskb_trim_rcsum(skb, len + sizeof(struct ipv6hdr))) | |
861 | goto out; | |
862 | ip6h = ipv6_hdr(skb); | |
863 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
864 | goto out; | |
865 | uh = udp_hdr(skb); | |
866 | ulen = ntohs(uh->len); | |
867 | if (ulen != skb->len) | |
868 | goto out; | |
869 | if (udp6_csum_init(skb, uh, IPPROTO_UDP)) | |
870 | goto out; | |
871 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
faeed828 | 872 | if (!ipv6_addr_equal(&np->local_ip.in6, &ip6h->daddr)) |
b3d936f3 | 873 | continue; |
faeed828 | 874 | if (!ipv6_addr_equal(&np->remote_ip.in6, &ip6h->saddr)) |
b3d936f3 CW |
875 | continue; |
876 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
877 | continue; | |
878 | ||
879 | np->rx_hook(np, ntohs(uh->source), | |
880 | (char *)(uh+1), | |
881 | ulen - sizeof(struct udphdr)); | |
882 | hits++; | |
883 | } | |
884 | #endif | |
508e14b4 DB |
885 | } |
886 | ||
887 | if (!hits) | |
888 | goto out; | |
1da177e4 LT |
889 | |
890 | kfree_skb(skb); | |
891 | return 1; | |
892 | ||
893 | out: | |
894 | if (atomic_read(&trapped)) { | |
895 | kfree_skb(skb); | |
896 | return 1; | |
897 | } | |
898 | ||
899 | return 0; | |
900 | } | |
901 | ||
0bcc1816 SS |
902 | void netpoll_print_options(struct netpoll *np) |
903 | { | |
e6ec2693 | 904 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
905 | if (np->ipv6) |
906 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
907 | else | |
b7394d24 | 908 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
909 | np_info(np, "interface '%s'\n", np->dev_name); |
910 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
911 | if (np->ipv6) |
912 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
913 | else | |
b7394d24 | 914 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 915 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 916 | } |
9e34a5b5 | 917 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 918 | |
b7394d24 CW |
919 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
920 | { | |
921 | const char *end; | |
922 | ||
923 | if (!strchr(str, ':') && | |
924 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
925 | if (!*end) | |
926 | return 0; | |
927 | } | |
928 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
929 | #if IS_ENABLED(CONFIG_IPV6) | |
930 | if (!*end) | |
931 | return 1; | |
932 | #else | |
933 | return -1; | |
934 | #endif | |
935 | } | |
936 | return -1; | |
937 | } | |
938 | ||
1da177e4 LT |
939 | int netpoll_parse_options(struct netpoll *np, char *opt) |
940 | { | |
941 | char *cur=opt, *delim; | |
b7394d24 | 942 | int ipv6; |
1da177e4 | 943 | |
c68b9070 | 944 | if (*cur != '@') { |
1da177e4 LT |
945 | if ((delim = strchr(cur, '@')) == NULL) |
946 | goto parse_failed; | |
c68b9070 | 947 | *delim = 0; |
4b5511eb AP |
948 | if (kstrtou16(cur, 10, &np->local_port)) |
949 | goto parse_failed; | |
c68b9070 | 950 | cur = delim; |
1da177e4 LT |
951 | } |
952 | cur++; | |
1da177e4 | 953 | |
c68b9070 | 954 | if (*cur != '/') { |
1da177e4 LT |
955 | if ((delim = strchr(cur, '/')) == NULL) |
956 | goto parse_failed; | |
c68b9070 | 957 | *delim = 0; |
b7394d24 CW |
958 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
959 | if (ipv6 < 0) | |
960 | goto parse_failed; | |
961 | else | |
962 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 963 | cur = delim; |
1da177e4 LT |
964 | } |
965 | cur++; | |
966 | ||
c68b9070 | 967 | if (*cur != ',') { |
1da177e4 LT |
968 | /* parse out dev name */ |
969 | if ((delim = strchr(cur, ',')) == NULL) | |
970 | goto parse_failed; | |
c68b9070 | 971 | *delim = 0; |
1da177e4 | 972 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 973 | cur = delim; |
1da177e4 LT |
974 | } |
975 | cur++; | |
976 | ||
c68b9070 | 977 | if (*cur != '@') { |
1da177e4 LT |
978 | /* dst port */ |
979 | if ((delim = strchr(cur, '@')) == NULL) | |
980 | goto parse_failed; | |
c68b9070 | 981 | *delim = 0; |
5fc05f87 | 982 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 983 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
984 | if (kstrtou16(cur, 10, &np->remote_port)) |
985 | goto parse_failed; | |
c68b9070 | 986 | cur = delim; |
1da177e4 LT |
987 | } |
988 | cur++; | |
1da177e4 LT |
989 | |
990 | /* dst ip */ | |
991 | if ((delim = strchr(cur, '/')) == NULL) | |
992 | goto parse_failed; | |
c68b9070 | 993 | *delim = 0; |
b7394d24 CW |
994 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
995 | if (ipv6 < 0) | |
996 | goto parse_failed; | |
997 | else if (np->ipv6 != (bool)ipv6) | |
998 | goto parse_failed; | |
999 | else | |
1000 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 1001 | cur = delim + 1; |
1da177e4 | 1002 | |
c68b9070 | 1003 | if (*cur != 0) { |
1da177e4 | 1004 | /* MAC address */ |
4940fc88 | 1005 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 1006 | goto parse_failed; |
1da177e4 LT |
1007 | } |
1008 | ||
0bcc1816 | 1009 | netpoll_print_options(np); |
1da177e4 LT |
1010 | |
1011 | return 0; | |
1012 | ||
1013 | parse_failed: | |
e6ec2693 | 1014 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
1015 | return -1; |
1016 | } | |
9e34a5b5 | 1017 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 1018 | |
47be03a2 | 1019 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp) |
1da177e4 | 1020 | { |
115c1d6e | 1021 | struct netpoll_info *npinfo; |
4247e161 | 1022 | const struct net_device_ops *ops; |
fbeec2e1 | 1023 | unsigned long flags; |
b41848b6 | 1024 | int err; |
1da177e4 | 1025 | |
30fdd8a0 JP |
1026 | np->dev = ndev; |
1027 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); | |
2cde6acd | 1028 | INIT_WORK(&np->cleanup_work, netpoll_async_cleanup); |
30fdd8a0 | 1029 | |
8fdd95ec HX |
1030 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
1031 | !ndev->netdev_ops->ndo_poll_controller) { | |
e6ec2693 JP |
1032 | np_err(np, "%s doesn't support polling, aborting\n", |
1033 | np->dev_name); | |
8fdd95ec HX |
1034 | err = -ENOTSUPP; |
1035 | goto out; | |
1036 | } | |
1037 | ||
1038 | if (!ndev->npinfo) { | |
47be03a2 | 1039 | npinfo = kmalloc(sizeof(*npinfo), gfp); |
8fdd95ec HX |
1040 | if (!npinfo) { |
1041 | err = -ENOMEM; | |
1042 | goto out; | |
1043 | } | |
1044 | ||
1045 | npinfo->rx_flags = 0; | |
1046 | INIT_LIST_HEAD(&npinfo->rx_np); | |
1047 | ||
1048 | spin_lock_init(&npinfo->rx_lock); | |
ca99ca14 | 1049 | mutex_init(&npinfo->dev_lock); |
b7394d24 | 1050 | skb_queue_head_init(&npinfo->neigh_tx); |
8fdd95ec HX |
1051 | skb_queue_head_init(&npinfo->txq); |
1052 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
1053 | ||
1054 | atomic_set(&npinfo->refcnt, 1); | |
1055 | ||
1056 | ops = np->dev->netdev_ops; | |
1057 | if (ops->ndo_netpoll_setup) { | |
47be03a2 | 1058 | err = ops->ndo_netpoll_setup(ndev, npinfo, gfp); |
8fdd95ec HX |
1059 | if (err) |
1060 | goto free_npinfo; | |
1061 | } | |
1062 | } else { | |
0790bbb6 | 1063 | npinfo = rtnl_dereference(ndev->npinfo); |
8fdd95ec HX |
1064 | atomic_inc(&npinfo->refcnt); |
1065 | } | |
1066 | ||
1067 | npinfo->netpoll = np; | |
1068 | ||
1069 | if (np->rx_hook) { | |
1070 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
1071 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
1072 | list_add_tail(&np->rx, &npinfo->rx_np); | |
1073 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1074 | } | |
1075 | ||
1076 | /* last thing to do is link it to the net device structure */ | |
cf778b00 | 1077 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
1078 | |
1079 | return 0; | |
1080 | ||
1081 | free_npinfo: | |
1082 | kfree(npinfo); | |
1083 | out: | |
1084 | return err; | |
1085 | } | |
1086 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
1087 | ||
1088 | int netpoll_setup(struct netpoll *np) | |
1089 | { | |
1090 | struct net_device *ndev = NULL; | |
1091 | struct in_device *in_dev; | |
1092 | int err; | |
1093 | ||
f92d3180 | 1094 | rtnl_lock(); |
556e6256 CW |
1095 | if (np->dev_name) { |
1096 | struct net *net = current->nsproxy->net_ns; | |
1097 | ndev = __dev_get_by_name(net, np->dev_name); | |
1098 | } | |
1da177e4 | 1099 | if (!ndev) { |
e6ec2693 | 1100 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
1101 | err = -ENODEV; |
1102 | goto unlock; | |
1da177e4 | 1103 | } |
5bd30d39 | 1104 | dev_hold(ndev); |
1da177e4 | 1105 | |
49bd8fb0 | 1106 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 1107 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
1108 | err = -EBUSY; |
1109 | goto put; | |
0c1ad04a WC |
1110 | } |
1111 | ||
1da177e4 LT |
1112 | if (!netif_running(ndev)) { |
1113 | unsigned long atmost, atleast; | |
1114 | ||
e6ec2693 | 1115 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 1116 | |
b41848b6 | 1117 | err = dev_open(ndev); |
b41848b6 SH |
1118 | |
1119 | if (err) { | |
e6ec2693 | 1120 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 1121 | goto put; |
1da177e4 | 1122 | } |
1da177e4 | 1123 | |
f92d3180 | 1124 | rtnl_unlock(); |
1da177e4 | 1125 | atleast = jiffies + HZ/10; |
bff38771 | 1126 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
1127 | while (!netif_carrier_ok(ndev)) { |
1128 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 1129 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
1130 | break; |
1131 | } | |
1b614fb9 | 1132 | msleep(1); |
1da177e4 LT |
1133 | } |
1134 | ||
1135 | /* If carrier appears to come up instantly, we don't | |
1136 | * trust it and pause so that we don't pump all our | |
1137 | * queued console messages into the bitbucket. | |
1138 | */ | |
1139 | ||
1140 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 1141 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
1142 | msleep(4000); |
1143 | } | |
f92d3180 | 1144 | rtnl_lock(); |
1da177e4 LT |
1145 | } |
1146 | ||
b7394d24 CW |
1147 | if (!np->local_ip.ip) { |
1148 | if (!np->ipv6) { | |
f92d3180 | 1149 | in_dev = __in_dev_get_rtnl(ndev); |
b7394d24 CW |
1150 | |
1151 | if (!in_dev || !in_dev->ifa_list) { | |
b7394d24 CW |
1152 | np_err(np, "no IP address for %s, aborting\n", |
1153 | np->dev_name); | |
1154 | err = -EDESTADDRREQ; | |
1155 | goto put; | |
1156 | } | |
1157 | ||
1158 | np->local_ip.ip = in_dev->ifa_list->ifa_local; | |
b7394d24 | 1159 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
1160 | } else { |
1161 | #if IS_ENABLED(CONFIG_IPV6) | |
1162 | struct inet6_dev *idev; | |
1163 | ||
1164 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
1165 | idev = __in6_dev_get(ndev); |
1166 | if (idev) { | |
1167 | struct inet6_ifaddr *ifp; | |
1168 | ||
1169 | read_lock_bh(&idev->lock); | |
1170 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
1171 | if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) | |
1172 | continue; | |
1173 | np->local_ip.in6 = ifp->addr; | |
1174 | err = 0; | |
1175 | break; | |
1176 | } | |
1177 | read_unlock_bh(&idev->lock); | |
1178 | } | |
b3d936f3 CW |
1179 | if (err) { |
1180 | np_err(np, "no IPv6 address for %s, aborting\n", | |
1181 | np->dev_name); | |
1182 | goto put; | |
1183 | } else | |
1184 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
1185 | #else | |
1186 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
1187 | np->dev_name); | |
e39363a9 | 1188 | err = -EINVAL; |
b3d936f3 CW |
1189 | goto put; |
1190 | #endif | |
1da177e4 | 1191 | } |
1da177e4 LT |
1192 | } |
1193 | ||
dbaa1541 HX |
1194 | /* fill up the skb queue */ |
1195 | refill_skbs(); | |
1196 | ||
47be03a2 | 1197 | err = __netpoll_setup(np, ndev, GFP_KERNEL); |
8fdd95ec HX |
1198 | if (err) |
1199 | goto put; | |
1200 | ||
f92d3180 | 1201 | rtnl_unlock(); |
1da177e4 LT |
1202 | return 0; |
1203 | ||
21edbb22 | 1204 | put: |
1da177e4 | 1205 | dev_put(ndev); |
f92d3180 CW |
1206 | unlock: |
1207 | rtnl_unlock(); | |
b41848b6 | 1208 | return err; |
1da177e4 | 1209 | } |
9e34a5b5 | 1210 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 1211 | |
c68b9070 DM |
1212 | static int __init netpoll_init(void) |
1213 | { | |
a1bcfacd | 1214 | skb_queue_head_init(&skb_pool); |
ca99ca14 | 1215 | init_srcu_struct(&netpoll_srcu); |
a1bcfacd SH |
1216 | return 0; |
1217 | } | |
1218 | core_initcall(netpoll_init); | |
1219 | ||
38e6bc18 AW |
1220 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
1221 | { | |
1222 | struct netpoll_info *npinfo = | |
1223 | container_of(rcu_head, struct netpoll_info, rcu); | |
1224 | ||
b7394d24 | 1225 | skb_queue_purge(&npinfo->neigh_tx); |
38e6bc18 AW |
1226 | skb_queue_purge(&npinfo->txq); |
1227 | ||
1228 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
1229 | cancel_delayed_work(&npinfo->tx_work); | |
1230 | ||
1231 | /* clean after last, unfinished work */ | |
1232 | __skb_queue_purge(&npinfo->txq); | |
1233 | /* now cancel it again */ | |
1234 | cancel_delayed_work(&npinfo->tx_work); | |
1235 | kfree(npinfo); | |
1236 | } | |
1237 | ||
8fdd95ec | 1238 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 1239 | { |
fbeec2e1 JM |
1240 | struct netpoll_info *npinfo; |
1241 | unsigned long flags; | |
1242 | ||
0790bbb6 NH |
1243 | /* rtnl_dereference would be preferable here but |
1244 | * rcu_cleanup_netpoll path can put us in here safely without | |
1245 | * holding the rtnl, so plain rcu_dereference it is | |
1246 | */ | |
1247 | npinfo = rtnl_dereference(np->dev->npinfo); | |
8fdd95ec | 1248 | if (!npinfo) |
dbaa1541 | 1249 | return; |
93ec2c72 | 1250 | |
8fdd95ec HX |
1251 | if (!list_empty(&npinfo->rx_np)) { |
1252 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
1253 | list_del(&np->rx); | |
1254 | if (list_empty(&npinfo->rx_np)) | |
1255 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
1256 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1257 | } | |
de85d99e | 1258 | |
ca99ca14 NH |
1259 | synchronize_srcu(&netpoll_srcu); |
1260 | ||
8fdd95ec HX |
1261 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
1262 | const struct net_device_ops *ops; | |
de85d99e | 1263 | |
8fdd95ec HX |
1264 | ops = np->dev->netdev_ops; |
1265 | if (ops->ndo_netpoll_cleanup) | |
1266 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 1267 | |
2cde6acd | 1268 | rcu_assign_pointer(np->dev->npinfo, NULL); |
38e6bc18 AW |
1269 | call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); |
1270 | } | |
1271 | } | |
1272 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 1273 | |
2cde6acd | 1274 | static void netpoll_async_cleanup(struct work_struct *work) |
38e6bc18 | 1275 | { |
2cde6acd | 1276 | struct netpoll *np = container_of(work, struct netpoll, cleanup_work); |
93ec2c72 | 1277 | |
2cde6acd | 1278 | rtnl_lock(); |
38e6bc18 | 1279 | __netpoll_cleanup(np); |
2cde6acd | 1280 | rtnl_unlock(); |
38e6bc18 AW |
1281 | kfree(np); |
1282 | } | |
93ec2c72 | 1283 | |
2cde6acd | 1284 | void __netpoll_free_async(struct netpoll *np) |
38e6bc18 | 1285 | { |
2cde6acd | 1286 | schedule_work(&np->cleanup_work); |
8fdd95ec | 1287 | } |
2cde6acd | 1288 | EXPORT_SYMBOL_GPL(__netpoll_free_async); |
fbeec2e1 | 1289 | |
8fdd95ec HX |
1290 | void netpoll_cleanup(struct netpoll *np) |
1291 | { | |
1292 | if (!np->dev) | |
1293 | return; | |
dbaa1541 | 1294 | |
8fdd95ec HX |
1295 | rtnl_lock(); |
1296 | __netpoll_cleanup(np); | |
1297 | rtnl_unlock(); | |
1298 | ||
1299 | dev_put(np->dev); | |
1da177e4 LT |
1300 | np->dev = NULL; |
1301 | } | |
9e34a5b5 | 1302 | EXPORT_SYMBOL(netpoll_cleanup); |
1da177e4 LT |
1303 | |
1304 | int netpoll_trap(void) | |
1305 | { | |
1306 | return atomic_read(&trapped); | |
1307 | } | |
9e34a5b5 | 1308 | EXPORT_SYMBOL(netpoll_trap); |
1da177e4 LT |
1309 | |
1310 | void netpoll_set_trap(int trap) | |
1311 | { | |
1312 | if (trap) | |
1313 | atomic_inc(&trapped); | |
1314 | else | |
1315 | atomic_dec(&trapped); | |
1316 | } | |
1da177e4 | 1317 | EXPORT_SYMBOL(netpoll_set_trap); |