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Commit | Line | Data |
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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 | ||
12 | #include <linux/smp_lock.h> | |
13 | #include <linux/netdevice.h> | |
14 | #include <linux/etherdevice.h> | |
15 | #include <linux/string.h> | |
14c85021 | 16 | #include <linux/if_arp.h> |
1da177e4 LT |
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 <net/tcp.h> | |
26 | #include <net/udp.h> | |
27 | #include <asm/unaligned.h> | |
28 | ||
29 | /* | |
30 | * We maintain a small pool of fully-sized skbs, to make sure the | |
31 | * message gets out even in extreme OOM situations. | |
32 | */ | |
33 | ||
34 | #define MAX_UDP_CHUNK 1460 | |
35 | #define MAX_SKBS 32 | |
36 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) | |
37 | ||
a1bcfacd | 38 | static struct sk_buff_head skb_pool; |
1da177e4 | 39 | |
1da177e4 LT |
40 | static atomic_t trapped; |
41 | ||
2bdfe0ba | 42 | #define USEC_PER_POLL 50 |
1da177e4 LT |
43 | #define NETPOLL_RX_ENABLED 1 |
44 | #define NETPOLL_RX_DROP 2 | |
45 | ||
46 | #define MAX_SKB_SIZE \ | |
47 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
48 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
49 | ||
50 | static void zap_completion_queue(void); | |
068c6e98 | 51 | static void arp_reply(struct sk_buff *skb); |
1da177e4 LT |
52 | |
53 | static void queue_process(void *p) | |
54 | { | |
b6cd27ed | 55 | struct netpoll_info *npinfo = p; |
1da177e4 LT |
56 | struct sk_buff *skb; |
57 | ||
6c43ff18 SH |
58 | while ((skb = skb_dequeue(&npinfo->txq))) { |
59 | struct net_device *dev = skb->dev; | |
1da177e4 | 60 | |
6c43ff18 SH |
61 | if (!netif_device_present(dev) || !netif_running(dev)) { |
62 | __kfree_skb(skb); | |
63 | continue; | |
64 | } | |
65 | ||
66 | netif_tx_lock_bh(dev); | |
67 | if (netif_queue_stopped(dev) || | |
68 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { | |
69 | skb_queue_head(&npinfo->txq, skb); | |
70 | netif_tx_unlock_bh(dev); | |
71 | ||
72 | schedule_delayed_work(&npinfo->tx_work, HZ/10); | |
73 | return; | |
74 | } | |
2bdfe0ba | 75 | |
6c43ff18 SH |
76 | netif_tx_unlock_bh(dev); |
77 | } | |
b6cd27ed | 78 | } |
1da177e4 | 79 | |
1da177e4 | 80 | static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
c68b9070 | 81 | unsigned short ulen, u32 saddr, u32 daddr) |
1da177e4 | 82 | { |
fb286bb2 HX |
83 | unsigned int psum; |
84 | ||
85 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) | |
1da177e4 LT |
86 | return 0; |
87 | ||
fb286bb2 HX |
88 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
89 | ||
84fa7933 | 90 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 91 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 92 | return 0; |
1da177e4 | 93 | |
fb286bb2 | 94 | skb->csum = psum; |
1da177e4 | 95 | |
fb286bb2 | 96 | return __skb_checksum_complete(skb); |
1da177e4 LT |
97 | } |
98 | ||
99 | /* | |
100 | * Check whether delayed processing was scheduled for our NIC. If so, | |
101 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
102 | * If this fails, either we've recursed in ->poll() or it's already | |
103 | * running on another CPU. | |
104 | * | |
105 | * Note: we don't mask interrupts with this lock because we're using | |
106 | * trylock here and interrupts are already disabled in the softirq | |
107 | * case. Further, we test the poll_owner to avoid recursion on UP | |
108 | * systems where the lock doesn't exist. | |
109 | * | |
110 | * In cases where there is bi-directional communications, reading only | |
111 | * one message at a time can lead to packets being dropped by the | |
112 | * network adapter, forcing superfluous retries and possibly timeouts. | |
113 | * Thus, we set our budget to greater than 1. | |
114 | */ | |
115 | static void poll_napi(struct netpoll *np) | |
116 | { | |
115c1d6e | 117 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
118 | int budget = 16; |
119 | ||
120 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
121 | npinfo->poll_owner != smp_processor_id() && |
122 | spin_trylock(&npinfo->poll_lock)) { | |
123 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
124 | atomic_inc(&trapped); |
125 | ||
126 | np->dev->poll(np->dev, &budget); | |
127 | ||
128 | atomic_dec(&trapped); | |
115c1d6e JM |
129 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
130 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
131 | } |
132 | } | |
133 | ||
068c6e98 NH |
134 | static void service_arp_queue(struct netpoll_info *npi) |
135 | { | |
136 | struct sk_buff *skb; | |
137 | ||
138 | if (unlikely(!npi)) | |
139 | return; | |
140 | ||
141 | skb = skb_dequeue(&npi->arp_tx); | |
142 | ||
143 | while (skb != NULL) { | |
144 | arp_reply(skb); | |
145 | skb = skb_dequeue(&npi->arp_tx); | |
146 | } | |
068c6e98 NH |
147 | } |
148 | ||
1da177e4 LT |
149 | void netpoll_poll(struct netpoll *np) |
150 | { | |
c68b9070 | 151 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
1da177e4 LT |
152 | return; |
153 | ||
154 | /* Process pending work on NIC */ | |
155 | np->dev->poll_controller(np->dev); | |
156 | if (np->dev->poll) | |
157 | poll_napi(np); | |
158 | ||
068c6e98 NH |
159 | service_arp_queue(np->dev->npinfo); |
160 | ||
1da177e4 LT |
161 | zap_completion_queue(); |
162 | } | |
163 | ||
164 | static void refill_skbs(void) | |
165 | { | |
166 | struct sk_buff *skb; | |
167 | unsigned long flags; | |
168 | ||
a1bcfacd SH |
169 | spin_lock_irqsave(&skb_pool.lock, flags); |
170 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
171 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
172 | if (!skb) | |
173 | break; | |
174 | ||
a1bcfacd | 175 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 176 | } |
a1bcfacd | 177 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
178 | } |
179 | ||
180 | static void zap_completion_queue(void) | |
181 | { | |
182 | unsigned long flags; | |
183 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
184 | ||
185 | if (sd->completion_queue) { | |
186 | struct sk_buff *clist; | |
187 | ||
188 | local_irq_save(flags); | |
189 | clist = sd->completion_queue; | |
190 | sd->completion_queue = NULL; | |
191 | local_irq_restore(flags); | |
192 | ||
193 | while (clist != NULL) { | |
194 | struct sk_buff *skb = clist; | |
195 | clist = clist->next; | |
c68b9070 | 196 | if (skb->destructor) |
1da177e4 LT |
197 | dev_kfree_skb_any(skb); /* put this one back */ |
198 | else | |
199 | __kfree_skb(skb); | |
200 | } | |
201 | } | |
202 | ||
203 | put_cpu_var(softnet_data); | |
204 | } | |
205 | ||
a1bcfacd | 206 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 207 | { |
a1bcfacd SH |
208 | int count = 0; |
209 | struct sk_buff *skb; | |
1da177e4 LT |
210 | |
211 | zap_completion_queue(); | |
a1bcfacd | 212 | refill_skbs(); |
1da177e4 | 213 | repeat: |
1da177e4 LT |
214 | |
215 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
216 | if (!skb) |
217 | skb = skb_dequeue(&skb_pool); | |
1da177e4 | 218 | |
c68b9070 | 219 | if (!skb) { |
a1bcfacd SH |
220 | if (++count < 10) { |
221 | netpoll_poll(np); | |
222 | goto repeat; | |
1da177e4 | 223 | } |
a1bcfacd | 224 | return NULL; |
1da177e4 LT |
225 | } |
226 | ||
227 | atomic_set(&skb->users, 1); | |
228 | skb_reserve(skb, reserve); | |
229 | return skb; | |
230 | } | |
231 | ||
232 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
233 | { | |
2bdfe0ba SH |
234 | int status = NETDEV_TX_BUSY; |
235 | unsigned long tries; | |
236 | struct net_device *dev = np->dev; | |
237 | struct netpoll_info *npinfo = np->dev->npinfo; | |
238 | ||
239 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { | |
240 | __kfree_skb(skb); | |
241 | return; | |
242 | } | |
243 | ||
244 | /* don't get messages out of order, and no recursion */ | |
c68b9070 DM |
245 | if (skb_queue_len(&npinfo->txq) == 0 && |
246 | npinfo->poll_owner != smp_processor_id() && | |
247 | netif_tx_trylock(dev)) { | |
2bdfe0ba | 248 | /* try until next clock tick */ |
c68b9070 | 249 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; tries > 0; --tries) { |
2bdfe0ba SH |
250 | if (!netif_queue_stopped(dev)) |
251 | status = dev->hard_start_xmit(skb, dev); | |
252 | ||
253 | if (status == NETDEV_TX_OK) | |
254 | break; | |
255 | ||
256 | /* tickle device maybe there is some cleanup */ | |
257 | netpoll_poll(np); | |
1da177e4 | 258 | |
2bdfe0ba SH |
259 | udelay(USEC_PER_POLL); |
260 | } | |
261 | netif_tx_unlock(dev); | |
1da177e4 LT |
262 | } |
263 | ||
2bdfe0ba | 264 | if (status != NETDEV_TX_OK) { |
5de4a473 SH |
265 | skb_queue_tail(&npinfo->txq, skb); |
266 | schedule_work(&npinfo->tx_work); | |
1da177e4 | 267 | } |
1da177e4 LT |
268 | } |
269 | ||
270 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
271 | { | |
272 | int total_len, eth_len, ip_len, udp_len; | |
273 | struct sk_buff *skb; | |
274 | struct udphdr *udph; | |
275 | struct iphdr *iph; | |
276 | struct ethhdr *eth; | |
277 | ||
278 | udp_len = len + sizeof(*udph); | |
279 | ip_len = eth_len = udp_len + sizeof(*iph); | |
280 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
281 | ||
282 | skb = find_skb(np, total_len, total_len - len); | |
283 | if (!skb) | |
284 | return; | |
285 | ||
286 | memcpy(skb->data, msg, len); | |
287 | skb->len += len; | |
288 | ||
206daaf7 | 289 | skb->h.uh = udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); |
1da177e4 LT |
290 | udph->source = htons(np->local_port); |
291 | udph->dest = htons(np->remote_port); | |
292 | udph->len = htons(udp_len); | |
293 | udph->check = 0; | |
8e365eec CL |
294 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
295 | htonl(np->remote_ip), | |
296 | udp_len, IPPROTO_UDP, | |
297 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
298 | if (udph->check == 0) | |
299 | udph->check = -1; | |
1da177e4 | 300 | |
206daaf7 | 301 | skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); |
1da177e4 LT |
302 | |
303 | /* iph->version = 4; iph->ihl = 5; */ | |
304 | put_unaligned(0x45, (unsigned char *)iph); | |
305 | iph->tos = 0; | |
306 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
307 | iph->id = 0; | |
308 | iph->frag_off = 0; | |
309 | iph->ttl = 64; | |
310 | iph->protocol = IPPROTO_UDP; | |
311 | iph->check = 0; | |
312 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
313 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
314 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
315 | ||
316 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
206daaf7 SH |
317 | skb->mac.raw = skb->data; |
318 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
1da177e4 LT |
319 | memcpy(eth->h_source, np->local_mac, 6); |
320 | memcpy(eth->h_dest, np->remote_mac, 6); | |
321 | ||
322 | skb->dev = np->dev; | |
323 | ||
324 | netpoll_send_skb(np, skb); | |
325 | } | |
326 | ||
327 | static void arp_reply(struct sk_buff *skb) | |
328 | { | |
115c1d6e | 329 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
330 | struct arphdr *arp; |
331 | unsigned char *arp_ptr; | |
332 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 333 | __be32 sip, tip; |
1da177e4 | 334 | struct sk_buff *send_skb; |
115c1d6e | 335 | struct netpoll *np = NULL; |
1da177e4 | 336 | |
fbeec2e1 JM |
337 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
338 | np = npinfo->rx_np; | |
115c1d6e JM |
339 | if (!np) |
340 | return; | |
1da177e4 LT |
341 | |
342 | /* No arp on this interface */ | |
343 | if (skb->dev->flags & IFF_NOARP) | |
344 | return; | |
345 | ||
346 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
347 | (2 * skb->dev->addr_len) + | |
348 | (2 * sizeof(u32))))) | |
349 | return; | |
350 | ||
351 | skb->h.raw = skb->nh.raw = skb->data; | |
352 | arp = skb->nh.arph; | |
353 | ||
354 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
355 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
356 | arp->ar_pro != htons(ETH_P_IP) || | |
357 | arp->ar_op != htons(ARPOP_REQUEST)) | |
358 | return; | |
359 | ||
360 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; | |
361 | memcpy(&sip, arp_ptr, 4); | |
362 | arp_ptr += 4 + skb->dev->addr_len; | |
363 | memcpy(&tip, arp_ptr, 4); | |
364 | ||
365 | /* Should we ignore arp? */ | |
366 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
367 | return; | |
368 | ||
369 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
370 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
371 | LL_RESERVED_SPACE(np->dev)); | |
372 | ||
373 | if (!send_skb) | |
374 | return; | |
375 | ||
376 | send_skb->nh.raw = send_skb->data; | |
377 | arp = (struct arphdr *) skb_put(send_skb, size); | |
378 | send_skb->dev = skb->dev; | |
379 | send_skb->protocol = htons(ETH_P_ARP); | |
380 | ||
381 | /* Fill the device header for the ARP frame */ | |
382 | ||
383 | if (np->dev->hard_header && | |
384 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
c68b9070 DM |
385 | np->remote_mac, np->local_mac, |
386 | send_skb->len) < 0) { | |
1da177e4 LT |
387 | kfree_skb(send_skb); |
388 | return; | |
389 | } | |
390 | ||
391 | /* | |
392 | * Fill out the arp protocol part. | |
393 | * | |
394 | * we only support ethernet device type, | |
395 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
396 | */ | |
397 | ||
398 | arp->ar_hrd = htons(np->dev->type); | |
399 | arp->ar_pro = htons(ETH_P_IP); | |
400 | arp->ar_hln = np->dev->addr_len; | |
401 | arp->ar_pln = 4; | |
402 | arp->ar_op = htons(type); | |
403 | ||
404 | arp_ptr=(unsigned char *)(arp + 1); | |
405 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
406 | arp_ptr += np->dev->addr_len; | |
407 | memcpy(arp_ptr, &tip, 4); | |
408 | arp_ptr += 4; | |
409 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); | |
410 | arp_ptr += np->dev->addr_len; | |
411 | memcpy(arp_ptr, &sip, 4); | |
412 | ||
413 | netpoll_send_skb(np, send_skb); | |
414 | } | |
415 | ||
416 | int __netpoll_rx(struct sk_buff *skb) | |
417 | { | |
418 | int proto, len, ulen; | |
419 | struct iphdr *iph; | |
420 | struct udphdr *uh; | |
068c6e98 NH |
421 | struct netpoll_info *npi = skb->dev->npinfo; |
422 | struct netpoll *np = npi->rx_np; | |
423 | ||
fbeec2e1 | 424 | if (!np) |
1da177e4 LT |
425 | goto out; |
426 | if (skb->dev->type != ARPHRD_ETHER) | |
427 | goto out; | |
428 | ||
429 | /* check if netpoll clients need ARP */ | |
430 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
431 | atomic_read(&trapped)) { | |
068c6e98 | 432 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
433 | return 1; |
434 | } | |
435 | ||
436 | proto = ntohs(eth_hdr(skb)->h_proto); | |
437 | if (proto != ETH_P_IP) | |
438 | goto out; | |
439 | if (skb->pkt_type == PACKET_OTHERHOST) | |
440 | goto out; | |
441 | if (skb_shared(skb)) | |
442 | goto out; | |
443 | ||
444 | iph = (struct iphdr *)skb->data; | |
445 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
446 | goto out; | |
447 | if (iph->ihl < 5 || iph->version != 4) | |
448 | goto out; | |
449 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
450 | goto out; | |
451 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
452 | goto out; | |
453 | ||
454 | len = ntohs(iph->tot_len); | |
455 | if (skb->len < len || len < iph->ihl*4) | |
456 | goto out; | |
457 | ||
458 | if (iph->protocol != IPPROTO_UDP) | |
459 | goto out; | |
460 | ||
461 | len -= iph->ihl*4; | |
462 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
463 | ulen = ntohs(uh->len); | |
464 | ||
465 | if (ulen != len) | |
466 | goto out; | |
fb286bb2 | 467 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
468 | goto out; |
469 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
470 | goto out; | |
471 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
472 | goto out; | |
473 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
474 | goto out; | |
475 | ||
476 | np->rx_hook(np, ntohs(uh->source), | |
477 | (char *)(uh+1), | |
478 | ulen - sizeof(struct udphdr)); | |
479 | ||
480 | kfree_skb(skb); | |
481 | return 1; | |
482 | ||
483 | out: | |
484 | if (atomic_read(&trapped)) { | |
485 | kfree_skb(skb); | |
486 | return 1; | |
487 | } | |
488 | ||
489 | return 0; | |
490 | } | |
491 | ||
492 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
493 | { | |
494 | char *cur=opt, *delim; | |
495 | ||
c68b9070 | 496 | if (*cur != '@') { |
1da177e4 LT |
497 | if ((delim = strchr(cur, '@')) == NULL) |
498 | goto parse_failed; | |
c68b9070 DM |
499 | *delim = 0; |
500 | np->local_port = simple_strtol(cur, NULL, 10); | |
501 | cur = delim; | |
1da177e4 LT |
502 | } |
503 | cur++; | |
504 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
505 | ||
c68b9070 | 506 | if (*cur != '/') { |
1da177e4 LT |
507 | if ((delim = strchr(cur, '/')) == NULL) |
508 | goto parse_failed; | |
c68b9070 DM |
509 | *delim = 0; |
510 | np->local_ip = ntohl(in_aton(cur)); | |
511 | cur = delim; | |
1da177e4 LT |
512 | |
513 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
514 | np->name, HIPQUAD(np->local_ip)); | |
515 | } | |
516 | cur++; | |
517 | ||
c68b9070 | 518 | if (*cur != ',') { |
1da177e4 LT |
519 | /* parse out dev name */ |
520 | if ((delim = strchr(cur, ',')) == NULL) | |
521 | goto parse_failed; | |
c68b9070 | 522 | *delim = 0; |
1da177e4 | 523 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 524 | cur = delim; |
1da177e4 LT |
525 | } |
526 | cur++; | |
527 | ||
528 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
529 | ||
c68b9070 | 530 | if (*cur != '@') { |
1da177e4 LT |
531 | /* dst port */ |
532 | if ((delim = strchr(cur, '@')) == NULL) | |
533 | goto parse_failed; | |
c68b9070 DM |
534 | *delim = 0; |
535 | np->remote_port = simple_strtol(cur, NULL, 10); | |
536 | cur = delim; | |
1da177e4 LT |
537 | } |
538 | cur++; | |
539 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
540 | ||
541 | /* dst ip */ | |
542 | if ((delim = strchr(cur, '/')) == NULL) | |
543 | goto parse_failed; | |
c68b9070 DM |
544 | *delim = 0; |
545 | np->remote_ip = ntohl(in_aton(cur)); | |
546 | cur = delim + 1; | |
1da177e4 LT |
547 | |
548 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
c68b9070 | 549 | np->name, HIPQUAD(np->remote_ip)); |
1da177e4 | 550 | |
c68b9070 | 551 | if (*cur != 0) { |
1da177e4 LT |
552 | /* MAC address */ |
553 | if ((delim = strchr(cur, ':')) == NULL) | |
554 | goto parse_failed; | |
c68b9070 DM |
555 | *delim = 0; |
556 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
557 | cur = delim + 1; | |
1da177e4 LT |
558 | if ((delim = strchr(cur, ':')) == NULL) |
559 | goto parse_failed; | |
c68b9070 DM |
560 | *delim = 0; |
561 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
562 | cur = delim + 1; | |
1da177e4 LT |
563 | if ((delim = strchr(cur, ':')) == NULL) |
564 | goto parse_failed; | |
c68b9070 DM |
565 | *delim = 0; |
566 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
567 | cur = delim + 1; | |
1da177e4 LT |
568 | if ((delim = strchr(cur, ':')) == NULL) |
569 | goto parse_failed; | |
c68b9070 DM |
570 | *delim = 0; |
571 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
572 | cur = delim + 1; | |
1da177e4 LT |
573 | if ((delim = strchr(cur, ':')) == NULL) |
574 | goto parse_failed; | |
c68b9070 DM |
575 | *delim = 0; |
576 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
577 | cur = delim + 1; | |
578 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
579 | } |
580 | ||
581 | printk(KERN_INFO "%s: remote ethernet address " | |
582 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
583 | np->name, | |
584 | np->remote_mac[0], | |
585 | np->remote_mac[1], | |
586 | np->remote_mac[2], | |
587 | np->remote_mac[3], | |
588 | np->remote_mac[4], | |
589 | np->remote_mac[5]); | |
590 | ||
591 | return 0; | |
592 | ||
593 | parse_failed: | |
594 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
595 | np->name, cur); | |
596 | return -1; | |
597 | } | |
598 | ||
599 | int netpoll_setup(struct netpoll *np) | |
600 | { | |
601 | struct net_device *ndev = NULL; | |
602 | struct in_device *in_dev; | |
115c1d6e | 603 | struct netpoll_info *npinfo; |
fbeec2e1 | 604 | unsigned long flags; |
b41848b6 | 605 | int err; |
1da177e4 LT |
606 | |
607 | if (np->dev_name) | |
608 | ndev = dev_get_by_name(np->dev_name); | |
609 | if (!ndev) { | |
610 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
611 | np->name, np->dev_name); | |
b41848b6 | 612 | return -ENODEV; |
1da177e4 LT |
613 | } |
614 | ||
615 | np->dev = ndev; | |
115c1d6e JM |
616 | if (!ndev->npinfo) { |
617 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
618 | if (!npinfo) { |
619 | err = -ENOMEM; | |
115c1d6e | 620 | goto release; |
b41848b6 | 621 | } |
115c1d6e | 622 | |
11513128 | 623 | npinfo->rx_flags = 0; |
fbeec2e1 | 624 | npinfo->rx_np = NULL; |
a9f6a0dd | 625 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 626 | npinfo->poll_owner = -1; |
2bdfe0ba | 627 | |
a9f6a0dd | 628 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 629 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed SH |
630 | skb_queue_head_init(&npinfo->txq); |
631 | INIT_WORK(&npinfo->tx_work, queue_process, npinfo); | |
632 | ||
93ec2c72 SH |
633 | atomic_set(&npinfo->refcnt, 1); |
634 | } else { | |
115c1d6e | 635 | npinfo = ndev->npinfo; |
93ec2c72 SH |
636 | atomic_inc(&npinfo->refcnt); |
637 | } | |
1da177e4 LT |
638 | |
639 | if (!ndev->poll_controller) { | |
640 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
641 | np->name, np->dev_name); | |
b41848b6 | 642 | err = -ENOTSUPP; |
1da177e4 LT |
643 | goto release; |
644 | } | |
645 | ||
646 | if (!netif_running(ndev)) { | |
647 | unsigned long atmost, atleast; | |
648 | ||
649 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
650 | np->name, np->dev_name); | |
651 | ||
6756ae4b | 652 | rtnl_lock(); |
b41848b6 SH |
653 | err = dev_open(ndev); |
654 | rtnl_unlock(); | |
655 | ||
656 | if (err) { | |
1da177e4 | 657 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 658 | np->name, ndev->name); |
1da177e4 LT |
659 | goto release; |
660 | } | |
1da177e4 LT |
661 | |
662 | atleast = jiffies + HZ/10; | |
663 | atmost = jiffies + 4*HZ; | |
664 | while (!netif_carrier_ok(ndev)) { | |
665 | if (time_after(jiffies, atmost)) { | |
666 | printk(KERN_NOTICE | |
667 | "%s: timeout waiting for carrier\n", | |
668 | np->name); | |
669 | break; | |
670 | } | |
671 | cond_resched(); | |
672 | } | |
673 | ||
674 | /* If carrier appears to come up instantly, we don't | |
675 | * trust it and pause so that we don't pump all our | |
676 | * queued console messages into the bitbucket. | |
677 | */ | |
678 | ||
679 | if (time_before(jiffies, atleast)) { | |
680 | printk(KERN_NOTICE "%s: carrier detect appears" | |
681 | " untrustworthy, waiting 4 seconds\n", | |
682 | np->name); | |
683 | msleep(4000); | |
684 | } | |
685 | } | |
686 | ||
3860288e | 687 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
688 | memcpy(np->local_mac, ndev->dev_addr, 6); |
689 | ||
690 | if (!np->local_ip) { | |
691 | rcu_read_lock(); | |
e5ed6399 | 692 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
693 | |
694 | if (!in_dev || !in_dev->ifa_list) { | |
695 | rcu_read_unlock(); | |
696 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
697 | np->name, np->dev_name); | |
b41848b6 | 698 | err = -EDESTADDRREQ; |
1da177e4 LT |
699 | goto release; |
700 | } | |
701 | ||
702 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
703 | rcu_read_unlock(); | |
704 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
705 | np->name, HIPQUAD(np->local_ip)); | |
706 | } | |
707 | ||
fbeec2e1 JM |
708 | if (np->rx_hook) { |
709 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
710 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
711 | npinfo->rx_np = np; | |
712 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
713 | } | |
26520765 IM |
714 | |
715 | /* fill up the skb queue */ | |
716 | refill_skbs(); | |
717 | ||
fbeec2e1 | 718 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 719 | ndev->npinfo = npinfo; |
1da177e4 | 720 | |
53fb95d3 MM |
721 | /* avoid racing with NAPI reading npinfo */ |
722 | synchronize_rcu(); | |
723 | ||
1da177e4 LT |
724 | return 0; |
725 | ||
726 | release: | |
115c1d6e JM |
727 | if (!ndev->npinfo) |
728 | kfree(npinfo); | |
1da177e4 LT |
729 | np->dev = NULL; |
730 | dev_put(ndev); | |
b41848b6 | 731 | return err; |
1da177e4 LT |
732 | } |
733 | ||
c68b9070 DM |
734 | static int __init netpoll_init(void) |
735 | { | |
a1bcfacd SH |
736 | skb_queue_head_init(&skb_pool); |
737 | return 0; | |
738 | } | |
739 | core_initcall(netpoll_init); | |
740 | ||
1da177e4 LT |
741 | void netpoll_cleanup(struct netpoll *np) |
742 | { | |
fbeec2e1 JM |
743 | struct netpoll_info *npinfo; |
744 | unsigned long flags; | |
745 | ||
115c1d6e | 746 | if (np->dev) { |
fbeec2e1 | 747 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
748 | if (npinfo) { |
749 | if (npinfo->rx_np == np) { | |
750 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
751 | npinfo->rx_np = NULL; | |
752 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
753 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
754 | } | |
755 | ||
756 | np->dev->npinfo = NULL; | |
757 | if (atomic_dec_and_test(&npinfo->refcnt)) { | |
758 | skb_queue_purge(&npinfo->arp_tx); | |
b6cd27ed | 759 | skb_queue_purge(&npinfo->txq); |
6c43ff18 | 760 | cancel_rearming_delayed_work(&npinfo->tx_work); |
b6cd27ed | 761 | flush_scheduled_work(); |
93ec2c72 SH |
762 | |
763 | kfree(npinfo); | |
764 | } | |
fbeec2e1 | 765 | } |
93ec2c72 | 766 | |
115c1d6e JM |
767 | dev_put(np->dev); |
768 | } | |
fbeec2e1 | 769 | |
1da177e4 LT |
770 | np->dev = NULL; |
771 | } | |
772 | ||
773 | int netpoll_trap(void) | |
774 | { | |
775 | return atomic_read(&trapped); | |
776 | } | |
777 | ||
778 | void netpoll_set_trap(int trap) | |
779 | { | |
780 | if (trap) | |
781 | atomic_inc(&trapped); | |
782 | else | |
783 | atomic_dec(&trapped); | |
784 | } | |
785 | ||
786 | EXPORT_SYMBOL(netpoll_set_trap); | |
787 | EXPORT_SYMBOL(netpoll_trap); | |
788 | EXPORT_SYMBOL(netpoll_parse_options); | |
789 | EXPORT_SYMBOL(netpoll_setup); | |
790 | EXPORT_SYMBOL(netpoll_cleanup); | |
791 | EXPORT_SYMBOL(netpoll_send_udp); | |
792 | EXPORT_SYMBOL(netpoll_poll); |