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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 | |
12 | #include <linux/moduleparam.h> |
13 | #include <linux/netdevice.h> |
14 | #include <linux/etherdevice.h> |
15 | #include <linux/string.h> |
16 | #include <linux/if_arp.h> |
17 | #include <linux/inetdevice.h> |
18 | #include <linux/inet.h> |
19 | #include <linux/interrupt.h> |
20 | #include <linux/netpoll.h> |
21 | #include <linux/sched.h> |
22 | #include <linux/delay.h> |
23 | #include <linux/rcupdate.h> |
24 | #include <linux/workqueue.h> |
25 | #include <linux/slab.h> |
26 | #include <net/tcp.h> |
27 | #include <net/udp.h> |
28 | #include <asm/unaligned.h> |
29 | #include <trace/events/napi.h> |
30 | |
31 | /* |
32 | * We maintain a small pool of fully-sized skbs, to make sure the |
33 | * message gets out even in extreme OOM situations. |
34 | */ |
35 | |
36 | #define MAX_UDP_CHUNK 1460 |
37 | #define MAX_SKBS 32 |
38 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) |
39 | |
40 | static struct sk_buff_head skb_pool; |
41 | |
42 | static atomic_t trapped; |
43 | |
44 | #define USEC_PER_POLL 50 |
45 | #define NETPOLL_RX_ENABLED 1 |
46 | #define NETPOLL_RX_DROP 2 |
47 | |
48 | #define MAX_SKB_SIZE \ |
49 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ |
50 | sizeof(struct iphdr) + sizeof(struct ethhdr)) |
51 | |
52 | static void zap_completion_queue(void); |
53 | static void arp_reply(struct sk_buff *skb); |
54 | |
55 | static unsigned int carrier_timeout = 4; |
56 | module_param(carrier_timeout, uint, 0644); |
57 | |
58 | static void queue_process(struct work_struct *work) |
59 | { |
60 | struct netpoll_info *npinfo = |
61 | container_of(work, struct netpoll_info, tx_work.work); |
62 | struct sk_buff *skb; |
63 | unsigned long flags; |
64 | |
65 | while ((skb = skb_dequeue(&npinfo->txq))) { |
66 | struct net_device *dev = skb->dev; |
67 | const struct net_device_ops *ops = dev->netdev_ops; |
68 | struct netdev_queue *txq; |
69 | |
70 | if (!netif_device_present(dev) || !netif_running(dev)) { |
71 | __kfree_skb(skb); |
72 | continue; |
73 | } |
74 | |
75 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
76 | |
77 | local_irq_save(flags); |
78 | __netif_tx_lock(txq, smp_processor_id()); |
79 | if (netif_tx_queue_stopped(txq) || |
80 | netif_tx_queue_frozen(txq) || |
81 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
82 | skb_queue_head(&npinfo->txq, skb); |
83 | __netif_tx_unlock(txq); |
84 | local_irq_restore(flags); |
85 | |
86 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
87 | return; |
88 | } |
89 | __netif_tx_unlock(txq); |
90 | local_irq_restore(flags); |
91 | } |
92 | } |
93 | |
94 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
95 | unsigned short ulen, __be32 saddr, __be32 daddr) |
96 | { |
97 | __wsum psum; |
98 | |
99 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
100 | return 0; |
101 | |
102 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
103 | |
104 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
105 | !csum_fold(csum_add(psum, skb->csum))) |
106 | return 0; |
107 | |
108 | skb->csum = psum; |
109 | |
110 | return __skb_checksum_complete(skb); |
111 | } |
112 | |
113 | /* |
114 | * Check whether delayed processing was scheduled for our NIC. If so, |
115 | * we attempt to grab the poll lock and use ->poll() to pump the card. |
116 | * If this fails, either we've recursed in ->poll() or it's already |
117 | * running on another CPU. |
118 | * |
119 | * Note: we don't mask interrupts with this lock because we're using |
120 | * trylock here and interrupts are already disabled in the softirq |
121 | * case. Further, we test the poll_owner to avoid recursion on UP |
122 | * systems where the lock doesn't exist. |
123 | * |
124 | * In cases where there is bi-directional communications, reading only |
125 | * one message at a time can lead to packets being dropped by the |
126 | * network adapter, forcing superfluous retries and possibly timeouts. |
127 | * Thus, we set our budget to greater than 1. |
128 | */ |
129 | static int poll_one_napi(struct netpoll_info *npinfo, |
130 | struct napi_struct *napi, int budget) |
131 | { |
132 | int work; |
133 | |
134 | /* net_rx_action's ->poll() invocations and our's are |
135 | * synchronized by this test which is only made while |
136 | * holding the napi->poll_lock. |
137 | */ |
138 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) |
139 | return budget; |
140 | |
141 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
142 | atomic_inc(&trapped); |
143 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
144 | |
145 | work = napi->poll(napi, budget); |
146 | trace_napi_poll(napi); |
147 | |
148 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
149 | atomic_dec(&trapped); |
150 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
151 | |
152 | return budget - work; |
153 | } |
154 | |
155 | static void poll_napi(struct net_device *dev) |
156 | { |
157 | struct napi_struct *napi; |
158 | int budget = 16; |
159 | |
160 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
161 | if (napi->poll_owner != smp_processor_id() && |
162 | spin_trylock(&napi->poll_lock)) { |
163 | budget = poll_one_napi(dev->npinfo, napi, budget); |
164 | spin_unlock(&napi->poll_lock); |
165 | |
166 | if (!budget) |
167 | break; |
168 | } |
169 | } |
170 | } |
171 | |
172 | static void service_arp_queue(struct netpoll_info *npi) |
173 | { |
174 | if (npi) { |
175 | struct sk_buff *skb; |
176 | |
177 | while ((skb = skb_dequeue(&npi->arp_tx))) |
178 | arp_reply(skb); |
179 | } |
180 | } |
181 | |
182 | void netpoll_poll(struct netpoll *np) |
183 | { |
184 | struct net_device *dev = np->dev; |
185 | const struct net_device_ops *ops; |
186 | |
187 | if (!dev || !netif_running(dev)) |
188 | return; |
189 | |
190 | ops = dev->netdev_ops; |
191 | if (!ops->ndo_poll_controller) |
192 | return; |
193 | |
194 | /* Process pending work on NIC */ |
195 | ops->ndo_poll_controller(dev); |
196 | |
197 | poll_napi(dev); |
198 | |
199 | service_arp_queue(dev->npinfo); |
200 | |
201 | zap_completion_queue(); |
202 | } |
203 | |
204 | static void refill_skbs(void) |
205 | { |
206 | struct sk_buff *skb; |
207 | unsigned long flags; |
208 | |
209 | spin_lock_irqsave(&skb_pool.lock, flags); |
210 | while (skb_pool.qlen < MAX_SKBS) { |
211 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
212 | if (!skb) |
213 | break; |
214 | |
215 | __skb_queue_tail(&skb_pool, skb); |
216 | } |
217 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
218 | } |
219 | |
220 | static void zap_completion_queue(void) |
221 | { |
222 | unsigned long flags; |
223 | struct softnet_data *sd = &get_cpu_var(softnet_data); |
224 | |
225 | if (sd->completion_queue) { |
226 | struct sk_buff *clist; |
227 | |
228 | local_irq_save(flags); |
229 | clist = sd->completion_queue; |
230 | sd->completion_queue = NULL; |
231 | local_irq_restore(flags); |
232 | |
233 | while (clist != NULL) { |
234 | struct sk_buff *skb = clist; |
235 | clist = clist->next; |
236 | if (skb->destructor) { |
237 | atomic_inc(&skb->users); |
238 | dev_kfree_skb_any(skb); /* put this one back */ |
239 | } else { |
240 | __kfree_skb(skb); |
241 | } |
242 | } |
243 | } |
244 | |
245 | put_cpu_var(softnet_data); |
246 | } |
247 | |
248 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
249 | { |
250 | int count = 0; |
251 | struct sk_buff *skb; |
252 | |
253 | zap_completion_queue(); |
254 | refill_skbs(); |
255 | repeat: |
256 | |
257 | skb = alloc_skb(len, GFP_ATOMIC); |
258 | if (!skb) |
259 | skb = skb_dequeue(&skb_pool); |
260 | |
261 | if (!skb) { |
262 | if (++count < 10) { |
263 | netpoll_poll(np); |
264 | goto repeat; |
265 | } |
266 | return NULL; |
267 | } |
268 | |
269 | atomic_set(&skb->users, 1); |
270 | skb_reserve(skb, reserve); |
271 | return skb; |
272 | } |
273 | |
274 | static int netpoll_owner_active(struct net_device *dev) |
275 | { |
276 | struct napi_struct *napi; |
277 | |
278 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
279 | if (napi->poll_owner == smp_processor_id()) |
280 | return 1; |
281 | } |
282 | return 0; |
283 | } |
284 | |
285 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
286 | { |
287 | int status = NETDEV_TX_BUSY; |
288 | unsigned long tries; |
289 | struct net_device *dev = np->dev; |
290 | const struct net_device_ops *ops = dev->netdev_ops; |
291 | struct netpoll_info *npinfo = np->dev->npinfo; |
292 | |
293 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
294 | __kfree_skb(skb); |
295 | return; |
296 | } |
297 | |
298 | /* don't get messages out of order, and no recursion */ |
299 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
300 | struct netdev_queue *txq; |
301 | unsigned long flags; |
302 | |
303 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
304 | |
305 | local_irq_save(flags); |
306 | /* try until next clock tick */ |
307 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; |
308 | tries > 0; --tries) { |
309 | if (__netif_tx_trylock(txq)) { |
310 | if (!netif_tx_queue_stopped(txq)) { |
311 | status = ops->ndo_start_xmit(skb, dev); |
312 | if (status == NETDEV_TX_OK) |
313 | txq_trans_update(txq); |
314 | } |
315 | __netif_tx_unlock(txq); |
316 | |
317 | if (status == NETDEV_TX_OK) |
318 | break; |
319 | |
320 | } |
321 | |
322 | /* tickle device maybe there is some cleanup */ |
323 | netpoll_poll(np); |
324 | |
325 | udelay(USEC_PER_POLL); |
326 | } |
327 | |
328 | WARN_ONCE(!irqs_disabled(), |
329 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", |
330 | dev->name, ops->ndo_start_xmit); |
331 | |
332 | local_irq_restore(flags); |
333 | } |
334 | |
335 | if (status != NETDEV_TX_OK) { |
336 | skb_queue_tail(&npinfo->txq, skb); |
337 | schedule_delayed_work(&npinfo->tx_work,0); |
338 | } |
339 | } |
340 | |
341 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) |
342 | { |
343 | int total_len, eth_len, ip_len, udp_len; |
344 | struct sk_buff *skb; |
345 | struct udphdr *udph; |
346 | struct iphdr *iph; |
347 | struct ethhdr *eth; |
348 | |
349 | udp_len = len + sizeof(*udph); |
350 | ip_len = eth_len = udp_len + sizeof(*iph); |
351 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; |
352 | |
353 | skb = find_skb(np, total_len, total_len - len); |
354 | if (!skb) |
355 | return; |
356 | |
357 | skb_copy_to_linear_data(skb, msg, len); |
358 | skb->len += len; |
359 | |
360 | skb_push(skb, sizeof(*udph)); |
361 | skb_reset_transport_header(skb); |
362 | udph = udp_hdr(skb); |
363 | udph->source = htons(np->local_port); |
364 | udph->dest = htons(np->remote_port); |
365 | udph->len = htons(udp_len); |
366 | udph->check = 0; |
367 | udph->check = csum_tcpudp_magic(np->local_ip, |
368 | np->remote_ip, |
369 | udp_len, IPPROTO_UDP, |
370 | csum_partial(udph, udp_len, 0)); |
371 | if (udph->check == 0) |
372 | udph->check = CSUM_MANGLED_0; |
373 | |
374 | skb_push(skb, sizeof(*iph)); |
375 | skb_reset_network_header(skb); |
376 | iph = ip_hdr(skb); |
377 | |
378 | /* iph->version = 4; iph->ihl = 5; */ |
379 | put_unaligned(0x45, (unsigned char *)iph); |
380 | iph->tos = 0; |
381 | put_unaligned(htons(ip_len), &(iph->tot_len)); |
382 | iph->id = 0; |
383 | iph->frag_off = 0; |
384 | iph->ttl = 64; |
385 | iph->protocol = IPPROTO_UDP; |
386 | iph->check = 0; |
387 | put_unaligned(np->local_ip, &(iph->saddr)); |
388 | put_unaligned(np->remote_ip, &(iph->daddr)); |
389 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
390 | |
391 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); |
392 | skb_reset_mac_header(skb); |
393 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
394 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
395 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); |
396 | |
397 | skb->dev = np->dev; |
398 | |
399 | netpoll_send_skb(np, skb); |
400 | } |
401 | |
402 | static void arp_reply(struct sk_buff *skb) |
403 | { |
404 | struct netpoll_info *npinfo = skb->dev->npinfo; |
405 | struct arphdr *arp; |
406 | unsigned char *arp_ptr; |
407 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; |
408 | __be32 sip, tip; |
409 | unsigned char *sha; |
410 | struct sk_buff *send_skb; |
411 | struct netpoll *np, *tmp; |
412 | unsigned long flags; |
413 | int hits = 0; |
414 | |
415 | if (list_empty(&npinfo->rx_np)) |
416 | return; |
417 | |
418 | /* Before checking the packet, we do some early |
419 | inspection whether this is interesting at all */ |
420 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
421 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
422 | if (np->dev == skb->dev) |
423 | hits++; |
424 | } |
425 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
426 | |
427 | /* No netpoll struct is using this dev */ |
428 | if (!hits) |
429 | return; |
430 | |
431 | /* No arp on this interface */ |
432 | if (skb->dev->flags & IFF_NOARP) |
433 | return; |
434 | |
435 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
436 | return; |
437 | |
438 | skb_reset_network_header(skb); |
439 | skb_reset_transport_header(skb); |
440 | arp = arp_hdr(skb); |
441 | |
442 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && |
443 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || |
444 | arp->ar_pro != htons(ETH_P_IP) || |
445 | arp->ar_op != htons(ARPOP_REQUEST)) |
446 | return; |
447 | |
448 | arp_ptr = (unsigned char *)(arp+1); |
449 | /* save the location of the src hw addr */ |
450 | sha = arp_ptr; |
451 | arp_ptr += skb->dev->addr_len; |
452 | memcpy(&sip, arp_ptr, 4); |
453 | arp_ptr += 4; |
454 | /* If we actually cared about dst hw addr, |
455 | it would get copied here */ |
456 | arp_ptr += skb->dev->addr_len; |
457 | memcpy(&tip, arp_ptr, 4); |
458 | |
459 | /* Should we ignore arp? */ |
460 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
461 | return; |
462 | |
463 | size = arp_hdr_len(skb->dev); |
464 | |
465 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
466 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
467 | if (tip != np->local_ip) |
468 | continue; |
469 | |
470 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
471 | LL_RESERVED_SPACE(np->dev)); |
472 | if (!send_skb) |
473 | continue; |
474 | |
475 | skb_reset_network_header(send_skb); |
476 | arp = (struct arphdr *) skb_put(send_skb, size); |
477 | send_skb->dev = skb->dev; |
478 | send_skb->protocol = htons(ETH_P_ARP); |
479 | |
480 | /* Fill the device header for the ARP frame */ |
481 | if (dev_hard_header(send_skb, skb->dev, ptype, |
482 | sha, np->dev->dev_addr, |
483 | send_skb->len) < 0) { |
484 | kfree_skb(send_skb); |
485 | continue; |
486 | } |
487 | |
488 | /* |
489 | * Fill out the arp protocol part. |
490 | * |
491 | * we only support ethernet device type, |
492 | * which (according to RFC 1390) should |
493 | * always equal 1 (Ethernet). |
494 | */ |
495 | |
496 | arp->ar_hrd = htons(np->dev->type); |
497 | arp->ar_pro = htons(ETH_P_IP); |
498 | arp->ar_hln = np->dev->addr_len; |
499 | arp->ar_pln = 4; |
500 | arp->ar_op = htons(type); |
501 | |
502 | arp_ptr = (unsigned char *)(arp + 1); |
503 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); |
504 | arp_ptr += np->dev->addr_len; |
505 | memcpy(arp_ptr, &tip, 4); |
506 | arp_ptr += 4; |
507 | memcpy(arp_ptr, sha, np->dev->addr_len); |
508 | arp_ptr += np->dev->addr_len; |
509 | memcpy(arp_ptr, &sip, 4); |
510 | |
511 | netpoll_send_skb(np, send_skb); |
512 | |
513 | /* If there are several rx_hooks for the same address, |
514 | we're fine by sending a single reply */ |
515 | break; |
516 | } |
517 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
518 | } |
519 | |
520 | int __netpoll_rx(struct sk_buff *skb) |
521 | { |
522 | int proto, len, ulen; |
523 | int hits = 0; |
524 | struct iphdr *iph; |
525 | struct udphdr *uh; |
526 | struct netpoll_info *npinfo = skb->dev->npinfo; |
527 | struct netpoll *np, *tmp; |
528 | |
529 | if (list_empty(&npinfo->rx_np)) |
530 | goto out; |
531 | |
532 | if (skb->dev->type != ARPHRD_ETHER) |
533 | goto out; |
534 | |
535 | /* check if netpoll clients need ARP */ |
536 | if (skb->protocol == htons(ETH_P_ARP) && |
537 | atomic_read(&trapped)) { |
538 | skb_queue_tail(&npinfo->arp_tx, skb); |
539 | return 1; |
540 | } |
541 | |
542 | proto = ntohs(eth_hdr(skb)->h_proto); |
543 | if (proto != ETH_P_IP) |
544 | goto out; |
545 | if (skb->pkt_type == PACKET_OTHERHOST) |
546 | goto out; |
547 | if (skb_shared(skb)) |
548 | goto out; |
549 | |
550 | iph = (struct iphdr *)skb->data; |
551 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
552 | goto out; |
553 | if (iph->ihl < 5 || iph->version != 4) |
554 | goto out; |
555 | if (!pskb_may_pull(skb, iph->ihl*4)) |
556 | goto out; |
557 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
558 | goto out; |
559 | |
560 | len = ntohs(iph->tot_len); |
561 | if (skb->len < len || len < iph->ihl*4) |
562 | goto out; |
563 | |
564 | /* |
565 | * Our transport medium may have padded the buffer out. |
566 | * Now We trim to the true length of the frame. |
567 | */ |
568 | if (pskb_trim_rcsum(skb, len)) |
569 | goto out; |
570 | |
571 | if (iph->protocol != IPPROTO_UDP) |
572 | goto out; |
573 | |
574 | len -= iph->ihl*4; |
575 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); |
576 | ulen = ntohs(uh->len); |
577 | |
578 | if (ulen != len) |
579 | goto out; |
580 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
581 | goto out; |
582 | |
583 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
584 | if (np->local_ip && np->local_ip != iph->daddr) |
585 | continue; |
586 | if (np->remote_ip && np->remote_ip != iph->saddr) |
587 | continue; |
588 | if (np->local_port && np->local_port != ntohs(uh->dest)) |
589 | continue; |
590 | |
591 | np->rx_hook(np, ntohs(uh->source), |
592 | (char *)(uh+1), |
593 | ulen - sizeof(struct udphdr)); |
594 | hits++; |
595 | } |
596 | |
597 | if (!hits) |
598 | goto out; |
599 | |
600 | kfree_skb(skb); |
601 | return 1; |
602 | |
603 | out: |
604 | if (atomic_read(&trapped)) { |
605 | kfree_skb(skb); |
606 | return 1; |
607 | } |
608 | |
609 | return 0; |
610 | } |
611 | |
612 | void netpoll_print_options(struct netpoll *np) |
613 | { |
614 | printk(KERN_INFO "%s: local port %d\n", |
615 | np->name, np->local_port); |
616 | printk(KERN_INFO "%s: local IP %pI4\n", |
617 | np->name, &np->local_ip); |
618 | printk(KERN_INFO "%s: interface '%s'\n", |
619 | np->name, np->dev_name); |
620 | printk(KERN_INFO "%s: remote port %d\n", |
621 | np->name, np->remote_port); |
622 | printk(KERN_INFO "%s: remote IP %pI4\n", |
623 | np->name, &np->remote_ip); |
624 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
625 | np->name, np->remote_mac); |
626 | } |
627 | |
628 | int netpoll_parse_options(struct netpoll *np, char *opt) |
629 | { |
630 | char *cur=opt, *delim; |
631 | |
632 | if (*cur != '@') { |
633 | if ((delim = strchr(cur, '@')) == NULL) |
634 | goto parse_failed; |
635 | *delim = 0; |
636 | np->local_port = simple_strtol(cur, NULL, 10); |
637 | cur = delim; |
638 | } |
639 | cur++; |
640 | |
641 | if (*cur != '/') { |
642 | if ((delim = strchr(cur, '/')) == NULL) |
643 | goto parse_failed; |
644 | *delim = 0; |
645 | np->local_ip = in_aton(cur); |
646 | cur = delim; |
647 | } |
648 | cur++; |
649 | |
650 | if (*cur != ',') { |
651 | /* parse out dev name */ |
652 | if ((delim = strchr(cur, ',')) == NULL) |
653 | goto parse_failed; |
654 | *delim = 0; |
655 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
656 | cur = delim; |
657 | } |
658 | cur++; |
659 | |
660 | if (*cur != '@') { |
661 | /* dst port */ |
662 | if ((delim = strchr(cur, '@')) == NULL) |
663 | goto parse_failed; |
664 | *delim = 0; |
665 | if (*cur == ' ' || *cur == '\t') |
666 | printk(KERN_INFO "%s: warning: whitespace" |
667 | "is not allowed\n", np->name); |
668 | np->remote_port = simple_strtol(cur, NULL, 10); |
669 | cur = delim; |
670 | } |
671 | cur++; |
672 | |
673 | /* dst ip */ |
674 | if ((delim = strchr(cur, '/')) == NULL) |
675 | goto parse_failed; |
676 | *delim = 0; |
677 | np->remote_ip = in_aton(cur); |
678 | cur = delim + 1; |
679 | |
680 | if (*cur != 0) { |
681 | /* MAC address */ |
682 | if ((delim = strchr(cur, ':')) == NULL) |
683 | goto parse_failed; |
684 | *delim = 0; |
685 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); |
686 | cur = delim + 1; |
687 | if ((delim = strchr(cur, ':')) == NULL) |
688 | goto parse_failed; |
689 | *delim = 0; |
690 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); |
691 | cur = delim + 1; |
692 | if ((delim = strchr(cur, ':')) == NULL) |
693 | goto parse_failed; |
694 | *delim = 0; |
695 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); |
696 | cur = delim + 1; |
697 | if ((delim = strchr(cur, ':')) == NULL) |
698 | goto parse_failed; |
699 | *delim = 0; |
700 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); |
701 | cur = delim + 1; |
702 | if ((delim = strchr(cur, ':')) == NULL) |
703 | goto parse_failed; |
704 | *delim = 0; |
705 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); |
706 | cur = delim + 1; |
707 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); |
708 | } |
709 | |
710 | netpoll_print_options(np); |
711 | |
712 | return 0; |
713 | |
714 | parse_failed: |
715 | printk(KERN_INFO "%s: couldn't parse config at '%s'!\n", |
716 | np->name, cur); |
717 | return -1; |
718 | } |
719 | |
720 | int netpoll_setup(struct netpoll *np) |
721 | { |
722 | struct net_device *ndev = NULL; |
723 | struct in_device *in_dev; |
724 | struct netpoll_info *npinfo; |
725 | struct netpoll *npe, *tmp; |
726 | unsigned long flags; |
727 | int err; |
728 | |
729 | if (np->dev_name) |
730 | ndev = dev_get_by_name(&init_net, np->dev_name); |
731 | if (!ndev) { |
732 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", |
733 | np->name, np->dev_name); |
734 | return -ENODEV; |
735 | } |
736 | |
737 | np->dev = ndev; |
738 | if (!ndev->npinfo) { |
739 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
740 | if (!npinfo) { |
741 | err = -ENOMEM; |
742 | goto put; |
743 | } |
744 | |
745 | npinfo->rx_flags = 0; |
746 | INIT_LIST_HEAD(&npinfo->rx_np); |
747 | |
748 | spin_lock_init(&npinfo->rx_lock); |
749 | skb_queue_head_init(&npinfo->arp_tx); |
750 | skb_queue_head_init(&npinfo->txq); |
751 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
752 | |
753 | atomic_set(&npinfo->refcnt, 1); |
754 | } else { |
755 | npinfo = ndev->npinfo; |
756 | atomic_inc(&npinfo->refcnt); |
757 | } |
758 | |
759 | if (!ndev->netdev_ops->ndo_poll_controller) { |
760 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", |
761 | np->name, np->dev_name); |
762 | err = -ENOTSUPP; |
763 | goto release; |
764 | } |
765 | |
766 | if (!netif_running(ndev)) { |
767 | unsigned long atmost, atleast; |
768 | |
769 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", |
770 | np->name, np->dev_name); |
771 | |
772 | rtnl_lock(); |
773 | err = dev_open(ndev); |
774 | rtnl_unlock(); |
775 | |
776 | if (err) { |
777 | printk(KERN_ERR "%s: failed to open %s\n", |
778 | np->name, ndev->name); |
779 | goto release; |
780 | } |
781 | |
782 | atleast = jiffies + HZ/10; |
783 | atmost = jiffies + carrier_timeout * HZ; |
784 | while (!netif_carrier_ok(ndev)) { |
785 | if (time_after(jiffies, atmost)) { |
786 | printk(KERN_NOTICE |
787 | "%s: timeout waiting for carrier\n", |
788 | np->name); |
789 | break; |
790 | } |
791 | msleep(1); |
792 | } |
793 | |
794 | /* If carrier appears to come up instantly, we don't |
795 | * trust it and pause so that we don't pump all our |
796 | * queued console messages into the bitbucket. |
797 | */ |
798 | |
799 | if (time_before(jiffies, atleast)) { |
800 | printk(KERN_NOTICE "%s: carrier detect appears" |
801 | " untrustworthy, waiting 4 seconds\n", |
802 | np->name); |
803 | msleep(4000); |
804 | } |
805 | } |
806 | |
807 | if (!np->local_ip) { |
808 | rcu_read_lock(); |
809 | in_dev = __in_dev_get_rcu(ndev); |
810 | |
811 | if (!in_dev || !in_dev->ifa_list) { |
812 | rcu_read_unlock(); |
813 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", |
814 | np->name, np->dev_name); |
815 | err = -EDESTADDRREQ; |
816 | goto release; |
817 | } |
818 | |
819 | np->local_ip = in_dev->ifa_list->ifa_local; |
820 | rcu_read_unlock(); |
821 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
822 | } |
823 | |
824 | if (np->rx_hook) { |
825 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
826 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
827 | list_add_tail(&np->rx, &npinfo->rx_np); |
828 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
829 | } |
830 | |
831 | /* fill up the skb queue */ |
832 | refill_skbs(); |
833 | |
834 | /* last thing to do is link it to the net device structure */ |
835 | ndev->npinfo = npinfo; |
836 | |
837 | /* avoid racing with NAPI reading npinfo */ |
838 | synchronize_rcu(); |
839 | |
840 | return 0; |
841 | |
842 | release: |
843 | if (!ndev->npinfo) { |
844 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
845 | list_for_each_entry_safe(npe, tmp, &npinfo->rx_np, rx) { |
846 | npe->dev = NULL; |
847 | } |
848 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
849 | |
850 | kfree(npinfo); |
851 | } |
852 | put: |
853 | dev_put(ndev); |
854 | return err; |
855 | } |
856 | |
857 | static int __init netpoll_init(void) |
858 | { |
859 | skb_queue_head_init(&skb_pool); |
860 | return 0; |
861 | } |
862 | core_initcall(netpoll_init); |
863 | |
864 | void netpoll_cleanup(struct netpoll *np) |
865 | { |
866 | struct netpoll_info *npinfo; |
867 | unsigned long flags; |
868 | |
869 | if (np->dev) { |
870 | npinfo = np->dev->npinfo; |
871 | if (npinfo) { |
872 | if (!list_empty(&npinfo->rx_np)) { |
873 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
874 | list_del(&np->rx); |
875 | if (list_empty(&npinfo->rx_np)) |
876 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
877 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
878 | } |
879 | |
880 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
881 | skb_queue_purge(&npinfo->arp_tx); |
882 | skb_queue_purge(&npinfo->txq); |
883 | cancel_rearming_delayed_work(&npinfo->tx_work); |
884 | |
885 | /* clean after last, unfinished work */ |
886 | __skb_queue_purge(&npinfo->txq); |
887 | kfree(npinfo); |
888 | np->dev->npinfo = NULL; |
889 | } |
890 | } |
891 | |
892 | dev_put(np->dev); |
893 | } |
894 | |
895 | np->dev = NULL; |
896 | } |
897 | |
898 | int netpoll_trap(void) |
899 | { |
900 | return atomic_read(&trapped); |
901 | } |
902 | |
903 | void netpoll_set_trap(int trap) |
904 | { |
905 | if (trap) |
906 | atomic_inc(&trapped); |
907 | else |
908 | atomic_dec(&trapped); |
909 | } |
910 | |
911 | EXPORT_SYMBOL(netpoll_set_trap); |
912 | EXPORT_SYMBOL(netpoll_trap); |
913 | EXPORT_SYMBOL(netpoll_print_options); |
914 | EXPORT_SYMBOL(netpoll_parse_options); |
915 | EXPORT_SYMBOL(netpoll_setup); |
916 | EXPORT_SYMBOL(netpoll_cleanup); |
917 | EXPORT_SYMBOL(netpoll_send_udp); |
918 | EXPORT_SYMBOL(netpoll_poll); |
919 |
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Tags:
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v2.6.34-rc5
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