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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) | |
0db1d6fc | 37 | #define MAX_RETRIES 20000 |
1da177e4 | 38 | |
a1bcfacd | 39 | static struct sk_buff_head skb_pool; |
1da177e4 | 40 | |
1da177e4 LT |
41 | static atomic_t trapped; |
42 | ||
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 | ||
b6cd27ed | 58 | while ((skb = skb_dequeue(&npinfo->txq))) |
1da177e4 | 59 | dev_queue_xmit(skb); |
1da177e4 | 60 | |
b6cd27ed | 61 | } |
1da177e4 LT |
62 | |
63 | void netpoll_queue(struct sk_buff *skb) | |
64 | { | |
b6cd27ed SH |
65 | struct net_device *dev = skb->dev; |
66 | struct netpoll_info *npinfo = dev->npinfo; | |
1da177e4 | 67 | |
b6cd27ed SH |
68 | if (!npinfo) |
69 | kfree_skb(skb); | |
70 | else { | |
71 | skb_queue_tail(&npinfo->txq, skb); | |
72 | schedule_work(&npinfo->tx_work); | |
1da177e4 | 73 | } |
1da177e4 LT |
74 | } |
75 | ||
76 | static int checksum_udp(struct sk_buff *skb, struct udphdr *uh, | |
77 | unsigned short ulen, u32 saddr, u32 daddr) | |
78 | { | |
fb286bb2 HX |
79 | unsigned int psum; |
80 | ||
81 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) | |
1da177e4 LT |
82 | return 0; |
83 | ||
fb286bb2 HX |
84 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
85 | ||
84fa7933 | 86 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
fb286bb2 HX |
87 | !(u16)csum_fold(csum_add(psum, skb->csum))) |
88 | return 0; | |
1da177e4 | 89 | |
fb286bb2 | 90 | skb->csum = psum; |
1da177e4 | 91 | |
fb286bb2 | 92 | return __skb_checksum_complete(skb); |
1da177e4 LT |
93 | } |
94 | ||
95 | /* | |
96 | * Check whether delayed processing was scheduled for our NIC. If so, | |
97 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
98 | * If this fails, either we've recursed in ->poll() or it's already | |
99 | * running on another CPU. | |
100 | * | |
101 | * Note: we don't mask interrupts with this lock because we're using | |
102 | * trylock here and interrupts are already disabled in the softirq | |
103 | * case. Further, we test the poll_owner to avoid recursion on UP | |
104 | * systems where the lock doesn't exist. | |
105 | * | |
106 | * In cases where there is bi-directional communications, reading only | |
107 | * one message at a time can lead to packets being dropped by the | |
108 | * network adapter, forcing superfluous retries and possibly timeouts. | |
109 | * Thus, we set our budget to greater than 1. | |
110 | */ | |
111 | static void poll_napi(struct netpoll *np) | |
112 | { | |
115c1d6e | 113 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
114 | int budget = 16; |
115 | ||
116 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
117 | npinfo->poll_owner != smp_processor_id() && |
118 | spin_trylock(&npinfo->poll_lock)) { | |
119 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
120 | atomic_inc(&trapped); |
121 | ||
122 | np->dev->poll(np->dev, &budget); | |
123 | ||
124 | atomic_dec(&trapped); | |
115c1d6e JM |
125 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
126 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
127 | } |
128 | } | |
129 | ||
068c6e98 NH |
130 | static void service_arp_queue(struct netpoll_info *npi) |
131 | { | |
132 | struct sk_buff *skb; | |
133 | ||
134 | if (unlikely(!npi)) | |
135 | return; | |
136 | ||
137 | skb = skb_dequeue(&npi->arp_tx); | |
138 | ||
139 | while (skb != NULL) { | |
140 | arp_reply(skb); | |
141 | skb = skb_dequeue(&npi->arp_tx); | |
142 | } | |
143 | return; | |
144 | } | |
145 | ||
1da177e4 LT |
146 | void netpoll_poll(struct netpoll *np) |
147 | { | |
148 | if(!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) | |
149 | return; | |
150 | ||
151 | /* Process pending work on NIC */ | |
152 | np->dev->poll_controller(np->dev); | |
153 | if (np->dev->poll) | |
154 | poll_napi(np); | |
155 | ||
068c6e98 NH |
156 | service_arp_queue(np->dev->npinfo); |
157 | ||
1da177e4 LT |
158 | zap_completion_queue(); |
159 | } | |
160 | ||
161 | static void refill_skbs(void) | |
162 | { | |
163 | struct sk_buff *skb; | |
164 | unsigned long flags; | |
165 | ||
a1bcfacd SH |
166 | spin_lock_irqsave(&skb_pool.lock, flags); |
167 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
168 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
169 | if (!skb) | |
170 | break; | |
171 | ||
a1bcfacd | 172 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 173 | } |
a1bcfacd | 174 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
175 | } |
176 | ||
177 | static void zap_completion_queue(void) | |
178 | { | |
179 | unsigned long flags; | |
180 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
181 | ||
182 | if (sd->completion_queue) { | |
183 | struct sk_buff *clist; | |
184 | ||
185 | local_irq_save(flags); | |
186 | clist = sd->completion_queue; | |
187 | sd->completion_queue = NULL; | |
188 | local_irq_restore(flags); | |
189 | ||
190 | while (clist != NULL) { | |
191 | struct sk_buff *skb = clist; | |
192 | clist = clist->next; | |
193 | if(skb->destructor) | |
194 | dev_kfree_skb_any(skb); /* put this one back */ | |
195 | else | |
196 | __kfree_skb(skb); | |
197 | } | |
198 | } | |
199 | ||
200 | put_cpu_var(softnet_data); | |
201 | } | |
202 | ||
a1bcfacd | 203 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 204 | { |
a1bcfacd SH |
205 | int count = 0; |
206 | struct sk_buff *skb; | |
1da177e4 LT |
207 | |
208 | zap_completion_queue(); | |
a1bcfacd | 209 | refill_skbs(); |
1da177e4 | 210 | repeat: |
1da177e4 LT |
211 | |
212 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
213 | if (!skb) |
214 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
215 | |
216 | if(!skb) { | |
a1bcfacd SH |
217 | if (++count < 10) { |
218 | netpoll_poll(np); | |
219 | goto repeat; | |
1da177e4 | 220 | } |
a1bcfacd | 221 | return NULL; |
1da177e4 LT |
222 | } |
223 | ||
224 | atomic_set(&skb->users, 1); | |
225 | skb_reserve(skb, reserve); | |
226 | return skb; | |
227 | } | |
228 | ||
229 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
230 | { | |
231 | int status; | |
115c1d6e | 232 | struct netpoll_info *npinfo; |
1da177e4 | 233 | |
f0d3459d | 234 | if (!np || !np->dev || !netif_running(np->dev)) { |
1da177e4 LT |
235 | __kfree_skb(skb); |
236 | return; | |
237 | } | |
238 | ||
115c1d6e | 239 | npinfo = np->dev->npinfo; |
f0d3459d MM |
240 | |
241 | /* avoid recursion */ | |
115c1d6e JM |
242 | if (npinfo->poll_owner == smp_processor_id() || |
243 | np->dev->xmit_lock_owner == smp_processor_id()) { | |
1da177e4 LT |
244 | if (np->drop) |
245 | np->drop(skb); | |
246 | else | |
247 | __kfree_skb(skb); | |
248 | return; | |
249 | } | |
250 | ||
0db1d6fc MM |
251 | do { |
252 | npinfo->tries--; | |
932ff279 | 253 | netif_tx_lock(np->dev); |
f0d3459d MM |
254 | |
255 | /* | |
256 | * network drivers do not expect to be called if the queue is | |
257 | * stopped. | |
258 | */ | |
8834807b JF |
259 | status = NETDEV_TX_BUSY; |
260 | if (!netif_queue_stopped(np->dev)) | |
261 | status = np->dev->hard_start_xmit(skb, np->dev); | |
1da177e4 | 262 | |
932ff279 | 263 | netif_tx_unlock(np->dev); |
1da177e4 | 264 | |
f0d3459d | 265 | /* success */ |
0db1d6fc MM |
266 | if(!status) { |
267 | npinfo->tries = MAX_RETRIES; /* reset */ | |
f0d3459d | 268 | return; |
0db1d6fc | 269 | } |
1da177e4 | 270 | |
f0d3459d | 271 | /* transmit busy */ |
1da177e4 | 272 | netpoll_poll(np); |
0db1d6fc MM |
273 | udelay(50); |
274 | } while (npinfo->tries > 0); | |
1da177e4 LT |
275 | } |
276 | ||
277 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
278 | { | |
279 | int total_len, eth_len, ip_len, udp_len; | |
280 | struct sk_buff *skb; | |
281 | struct udphdr *udph; | |
282 | struct iphdr *iph; | |
283 | struct ethhdr *eth; | |
284 | ||
285 | udp_len = len + sizeof(*udph); | |
286 | ip_len = eth_len = udp_len + sizeof(*iph); | |
287 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
288 | ||
289 | skb = find_skb(np, total_len, total_len - len); | |
290 | if (!skb) | |
291 | return; | |
292 | ||
293 | memcpy(skb->data, msg, len); | |
294 | skb->len += len; | |
295 | ||
206daaf7 | 296 | skb->h.uh = udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); |
1da177e4 LT |
297 | udph->source = htons(np->local_port); |
298 | udph->dest = htons(np->remote_port); | |
299 | udph->len = htons(udp_len); | |
300 | udph->check = 0; | |
8e365eec CL |
301 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
302 | htonl(np->remote_ip), | |
303 | udp_len, IPPROTO_UDP, | |
304 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
305 | if (udph->check == 0) | |
306 | udph->check = -1; | |
1da177e4 | 307 | |
206daaf7 | 308 | skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); |
1da177e4 LT |
309 | |
310 | /* iph->version = 4; iph->ihl = 5; */ | |
311 | put_unaligned(0x45, (unsigned char *)iph); | |
312 | iph->tos = 0; | |
313 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
314 | iph->id = 0; | |
315 | iph->frag_off = 0; | |
316 | iph->ttl = 64; | |
317 | iph->protocol = IPPROTO_UDP; | |
318 | iph->check = 0; | |
319 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
320 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
321 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
322 | ||
323 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
206daaf7 SH |
324 | skb->mac.raw = skb->data; |
325 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
1da177e4 LT |
326 | memcpy(eth->h_source, np->local_mac, 6); |
327 | memcpy(eth->h_dest, np->remote_mac, 6); | |
328 | ||
329 | skb->dev = np->dev; | |
330 | ||
331 | netpoll_send_skb(np, skb); | |
332 | } | |
333 | ||
334 | static void arp_reply(struct sk_buff *skb) | |
335 | { | |
115c1d6e | 336 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
337 | struct arphdr *arp; |
338 | unsigned char *arp_ptr; | |
339 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
340 | u32 sip, tip; | |
341 | struct sk_buff *send_skb; | |
115c1d6e | 342 | struct netpoll *np = NULL; |
1da177e4 | 343 | |
fbeec2e1 JM |
344 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
345 | np = npinfo->rx_np; | |
115c1d6e JM |
346 | if (!np) |
347 | return; | |
1da177e4 LT |
348 | |
349 | /* No arp on this interface */ | |
350 | if (skb->dev->flags & IFF_NOARP) | |
351 | return; | |
352 | ||
353 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
354 | (2 * skb->dev->addr_len) + | |
355 | (2 * sizeof(u32))))) | |
356 | return; | |
357 | ||
358 | skb->h.raw = skb->nh.raw = skb->data; | |
359 | arp = skb->nh.arph; | |
360 | ||
361 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
362 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
363 | arp->ar_pro != htons(ETH_P_IP) || | |
364 | arp->ar_op != htons(ARPOP_REQUEST)) | |
365 | return; | |
366 | ||
367 | arp_ptr = (unsigned char *)(arp+1) + skb->dev->addr_len; | |
368 | memcpy(&sip, arp_ptr, 4); | |
369 | arp_ptr += 4 + skb->dev->addr_len; | |
370 | memcpy(&tip, arp_ptr, 4); | |
371 | ||
372 | /* Should we ignore arp? */ | |
373 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
374 | return; | |
375 | ||
376 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
377 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
378 | LL_RESERVED_SPACE(np->dev)); | |
379 | ||
380 | if (!send_skb) | |
381 | return; | |
382 | ||
383 | send_skb->nh.raw = send_skb->data; | |
384 | arp = (struct arphdr *) skb_put(send_skb, size); | |
385 | send_skb->dev = skb->dev; | |
386 | send_skb->protocol = htons(ETH_P_ARP); | |
387 | ||
388 | /* Fill the device header for the ARP frame */ | |
389 | ||
390 | if (np->dev->hard_header && | |
391 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
392 | np->remote_mac, np->local_mac, | |
393 | send_skb->len) < 0) { | |
394 | kfree_skb(send_skb); | |
395 | return; | |
396 | } | |
397 | ||
398 | /* | |
399 | * Fill out the arp protocol part. | |
400 | * | |
401 | * we only support ethernet device type, | |
402 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
403 | */ | |
404 | ||
405 | arp->ar_hrd = htons(np->dev->type); | |
406 | arp->ar_pro = htons(ETH_P_IP); | |
407 | arp->ar_hln = np->dev->addr_len; | |
408 | arp->ar_pln = 4; | |
409 | arp->ar_op = htons(type); | |
410 | ||
411 | arp_ptr=(unsigned char *)(arp + 1); | |
412 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
413 | arp_ptr += np->dev->addr_len; | |
414 | memcpy(arp_ptr, &tip, 4); | |
415 | arp_ptr += 4; | |
416 | memcpy(arp_ptr, np->remote_mac, np->dev->addr_len); | |
417 | arp_ptr += np->dev->addr_len; | |
418 | memcpy(arp_ptr, &sip, 4); | |
419 | ||
420 | netpoll_send_skb(np, send_skb); | |
421 | } | |
422 | ||
423 | int __netpoll_rx(struct sk_buff *skb) | |
424 | { | |
425 | int proto, len, ulen; | |
426 | struct iphdr *iph; | |
427 | struct udphdr *uh; | |
068c6e98 NH |
428 | struct netpoll_info *npi = skb->dev->npinfo; |
429 | struct netpoll *np = npi->rx_np; | |
430 | ||
1da177e4 | 431 | |
fbeec2e1 | 432 | if (!np) |
1da177e4 LT |
433 | goto out; |
434 | if (skb->dev->type != ARPHRD_ETHER) | |
435 | goto out; | |
436 | ||
437 | /* check if netpoll clients need ARP */ | |
438 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
439 | atomic_read(&trapped)) { | |
068c6e98 | 440 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
441 | return 1; |
442 | } | |
443 | ||
444 | proto = ntohs(eth_hdr(skb)->h_proto); | |
445 | if (proto != ETH_P_IP) | |
446 | goto out; | |
447 | if (skb->pkt_type == PACKET_OTHERHOST) | |
448 | goto out; | |
449 | if (skb_shared(skb)) | |
450 | goto out; | |
451 | ||
452 | iph = (struct iphdr *)skb->data; | |
453 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
454 | goto out; | |
455 | if (iph->ihl < 5 || iph->version != 4) | |
456 | goto out; | |
457 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
458 | goto out; | |
459 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
460 | goto out; | |
461 | ||
462 | len = ntohs(iph->tot_len); | |
463 | if (skb->len < len || len < iph->ihl*4) | |
464 | goto out; | |
465 | ||
466 | if (iph->protocol != IPPROTO_UDP) | |
467 | goto out; | |
468 | ||
469 | len -= iph->ihl*4; | |
470 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
471 | ulen = ntohs(uh->len); | |
472 | ||
473 | if (ulen != len) | |
474 | goto out; | |
fb286bb2 | 475 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
476 | goto out; |
477 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
478 | goto out; | |
479 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
480 | goto out; | |
481 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
482 | goto out; | |
483 | ||
484 | np->rx_hook(np, ntohs(uh->source), | |
485 | (char *)(uh+1), | |
486 | ulen - sizeof(struct udphdr)); | |
487 | ||
488 | kfree_skb(skb); | |
489 | return 1; | |
490 | ||
491 | out: | |
492 | if (atomic_read(&trapped)) { | |
493 | kfree_skb(skb); | |
494 | return 1; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
501 | { | |
502 | char *cur=opt, *delim; | |
503 | ||
504 | if(*cur != '@') { | |
505 | if ((delim = strchr(cur, '@')) == NULL) | |
506 | goto parse_failed; | |
507 | *delim=0; | |
508 | np->local_port=simple_strtol(cur, NULL, 10); | |
509 | cur=delim; | |
510 | } | |
511 | cur++; | |
512 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
513 | ||
514 | if(*cur != '/') { | |
515 | if ((delim = strchr(cur, '/')) == NULL) | |
516 | goto parse_failed; | |
517 | *delim=0; | |
518 | np->local_ip=ntohl(in_aton(cur)); | |
519 | cur=delim; | |
520 | ||
521 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
522 | np->name, HIPQUAD(np->local_ip)); | |
523 | } | |
524 | cur++; | |
525 | ||
526 | if ( *cur != ',') { | |
527 | /* parse out dev name */ | |
528 | if ((delim = strchr(cur, ',')) == NULL) | |
529 | goto parse_failed; | |
530 | *delim=0; | |
531 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); | |
532 | cur=delim; | |
533 | } | |
534 | cur++; | |
535 | ||
536 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
537 | ||
538 | if ( *cur != '@' ) { | |
539 | /* dst port */ | |
540 | if ((delim = strchr(cur, '@')) == NULL) | |
541 | goto parse_failed; | |
542 | *delim=0; | |
543 | np->remote_port=simple_strtol(cur, NULL, 10); | |
544 | cur=delim; | |
545 | } | |
546 | cur++; | |
547 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
548 | ||
549 | /* dst ip */ | |
550 | if ((delim = strchr(cur, '/')) == NULL) | |
551 | goto parse_failed; | |
552 | *delim=0; | |
553 | np->remote_ip=ntohl(in_aton(cur)); | |
554 | cur=delim+1; | |
555 | ||
556 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
557 | np->name, HIPQUAD(np->remote_ip)); | |
558 | ||
559 | if( *cur != 0 ) | |
560 | { | |
561 | /* MAC address */ | |
562 | if ((delim = strchr(cur, ':')) == NULL) | |
563 | goto parse_failed; | |
564 | *delim=0; | |
565 | np->remote_mac[0]=simple_strtol(cur, NULL, 16); | |
566 | cur=delim+1; | |
567 | if ((delim = strchr(cur, ':')) == NULL) | |
568 | goto parse_failed; | |
569 | *delim=0; | |
570 | np->remote_mac[1]=simple_strtol(cur, NULL, 16); | |
571 | cur=delim+1; | |
572 | if ((delim = strchr(cur, ':')) == NULL) | |
573 | goto parse_failed; | |
574 | *delim=0; | |
575 | np->remote_mac[2]=simple_strtol(cur, NULL, 16); | |
576 | cur=delim+1; | |
577 | if ((delim = strchr(cur, ':')) == NULL) | |
578 | goto parse_failed; | |
579 | *delim=0; | |
580 | np->remote_mac[3]=simple_strtol(cur, NULL, 16); | |
581 | cur=delim+1; | |
582 | if ((delim = strchr(cur, ':')) == NULL) | |
583 | goto parse_failed; | |
584 | *delim=0; | |
585 | np->remote_mac[4]=simple_strtol(cur, NULL, 16); | |
586 | cur=delim+1; | |
587 | np->remote_mac[5]=simple_strtol(cur, NULL, 16); | |
588 | } | |
589 | ||
590 | printk(KERN_INFO "%s: remote ethernet address " | |
591 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
592 | np->name, | |
593 | np->remote_mac[0], | |
594 | np->remote_mac[1], | |
595 | np->remote_mac[2], | |
596 | np->remote_mac[3], | |
597 | np->remote_mac[4], | |
598 | np->remote_mac[5]); | |
599 | ||
600 | return 0; | |
601 | ||
602 | parse_failed: | |
603 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
604 | np->name, cur); | |
605 | return -1; | |
606 | } | |
607 | ||
608 | int netpoll_setup(struct netpoll *np) | |
609 | { | |
610 | struct net_device *ndev = NULL; | |
611 | struct in_device *in_dev; | |
115c1d6e | 612 | struct netpoll_info *npinfo; |
fbeec2e1 | 613 | unsigned long flags; |
b41848b6 | 614 | int err; |
1da177e4 LT |
615 | |
616 | if (np->dev_name) | |
617 | ndev = dev_get_by_name(np->dev_name); | |
618 | if (!ndev) { | |
619 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
620 | np->name, np->dev_name); | |
b41848b6 | 621 | return -ENODEV; |
1da177e4 LT |
622 | } |
623 | ||
624 | np->dev = ndev; | |
115c1d6e JM |
625 | if (!ndev->npinfo) { |
626 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
627 | if (!npinfo) { |
628 | err = -ENOMEM; | |
115c1d6e | 629 | goto release; |
b41848b6 | 630 | } |
115c1d6e | 631 | |
11513128 | 632 | npinfo->rx_flags = 0; |
fbeec2e1 | 633 | npinfo->rx_np = NULL; |
a9f6a0dd | 634 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 635 | npinfo->poll_owner = -1; |
0db1d6fc | 636 | npinfo->tries = MAX_RETRIES; |
a9f6a0dd | 637 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 638 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed SH |
639 | skb_queue_head_init(&npinfo->txq); |
640 | INIT_WORK(&npinfo->tx_work, queue_process, npinfo); | |
641 | ||
93ec2c72 SH |
642 | atomic_set(&npinfo->refcnt, 1); |
643 | } else { | |
115c1d6e | 644 | npinfo = ndev->npinfo; |
93ec2c72 SH |
645 | atomic_inc(&npinfo->refcnt); |
646 | } | |
1da177e4 LT |
647 | |
648 | if (!ndev->poll_controller) { | |
649 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
650 | np->name, np->dev_name); | |
b41848b6 | 651 | err = -ENOTSUPP; |
1da177e4 LT |
652 | goto release; |
653 | } | |
654 | ||
655 | if (!netif_running(ndev)) { | |
656 | unsigned long atmost, atleast; | |
657 | ||
658 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
659 | np->name, np->dev_name); | |
660 | ||
6756ae4b | 661 | rtnl_lock(); |
b41848b6 SH |
662 | err = dev_open(ndev); |
663 | rtnl_unlock(); | |
664 | ||
665 | if (err) { | |
1da177e4 | 666 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 667 | np->name, ndev->name); |
1da177e4 LT |
668 | goto release; |
669 | } | |
1da177e4 LT |
670 | |
671 | atleast = jiffies + HZ/10; | |
672 | atmost = jiffies + 4*HZ; | |
673 | while (!netif_carrier_ok(ndev)) { | |
674 | if (time_after(jiffies, atmost)) { | |
675 | printk(KERN_NOTICE | |
676 | "%s: timeout waiting for carrier\n", | |
677 | np->name); | |
678 | break; | |
679 | } | |
680 | cond_resched(); | |
681 | } | |
682 | ||
683 | /* If carrier appears to come up instantly, we don't | |
684 | * trust it and pause so that we don't pump all our | |
685 | * queued console messages into the bitbucket. | |
686 | */ | |
687 | ||
688 | if (time_before(jiffies, atleast)) { | |
689 | printk(KERN_NOTICE "%s: carrier detect appears" | |
690 | " untrustworthy, waiting 4 seconds\n", | |
691 | np->name); | |
692 | msleep(4000); | |
693 | } | |
694 | } | |
695 | ||
3860288e | 696 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
697 | memcpy(np->local_mac, ndev->dev_addr, 6); |
698 | ||
699 | if (!np->local_ip) { | |
700 | rcu_read_lock(); | |
e5ed6399 | 701 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
702 | |
703 | if (!in_dev || !in_dev->ifa_list) { | |
704 | rcu_read_unlock(); | |
705 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
706 | np->name, np->dev_name); | |
b41848b6 | 707 | err = -EDESTADDRREQ; |
1da177e4 LT |
708 | goto release; |
709 | } | |
710 | ||
711 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
712 | rcu_read_unlock(); | |
713 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
714 | np->name, HIPQUAD(np->local_ip)); | |
715 | } | |
716 | ||
fbeec2e1 JM |
717 | if (np->rx_hook) { |
718 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
719 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
720 | npinfo->rx_np = np; | |
721 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
722 | } | |
26520765 IM |
723 | |
724 | /* fill up the skb queue */ | |
725 | refill_skbs(); | |
726 | ||
fbeec2e1 | 727 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 728 | ndev->npinfo = npinfo; |
1da177e4 | 729 | |
53fb95d3 MM |
730 | /* avoid racing with NAPI reading npinfo */ |
731 | synchronize_rcu(); | |
732 | ||
1da177e4 LT |
733 | return 0; |
734 | ||
735 | release: | |
115c1d6e JM |
736 | if (!ndev->npinfo) |
737 | kfree(npinfo); | |
1da177e4 LT |
738 | np->dev = NULL; |
739 | dev_put(ndev); | |
b41848b6 | 740 | return err; |
1da177e4 LT |
741 | } |
742 | ||
a1bcfacd SH |
743 | static int __init netpoll_init(void) { |
744 | skb_queue_head_init(&skb_pool); | |
745 | return 0; | |
746 | } | |
747 | core_initcall(netpoll_init); | |
748 | ||
1da177e4 LT |
749 | void netpoll_cleanup(struct netpoll *np) |
750 | { | |
fbeec2e1 JM |
751 | struct netpoll_info *npinfo; |
752 | unsigned long flags; | |
753 | ||
115c1d6e | 754 | if (np->dev) { |
fbeec2e1 | 755 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
756 | if (npinfo) { |
757 | if (npinfo->rx_np == np) { | |
758 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
759 | npinfo->rx_np = NULL; | |
760 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
761 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
762 | } | |
763 | ||
764 | np->dev->npinfo = NULL; | |
765 | if (atomic_dec_and_test(&npinfo->refcnt)) { | |
766 | skb_queue_purge(&npinfo->arp_tx); | |
b6cd27ed SH |
767 | skb_queue_purge(&npinfo->txq); |
768 | flush_scheduled_work(); | |
93ec2c72 SH |
769 | |
770 | kfree(npinfo); | |
771 | } | |
fbeec2e1 | 772 | } |
93ec2c72 | 773 | |
115c1d6e JM |
774 | dev_put(np->dev); |
775 | } | |
fbeec2e1 | 776 | |
1da177e4 LT |
777 | np->dev = NULL; |
778 | } | |
779 | ||
780 | int netpoll_trap(void) | |
781 | { | |
782 | return atomic_read(&trapped); | |
783 | } | |
784 | ||
785 | void netpoll_set_trap(int trap) | |
786 | { | |
787 | if (trap) | |
788 | atomic_inc(&trapped); | |
789 | else | |
790 | atomic_dec(&trapped); | |
791 | } | |
792 | ||
793 | EXPORT_SYMBOL(netpoll_set_trap); | |
794 | EXPORT_SYMBOL(netpoll_trap); | |
795 | EXPORT_SYMBOL(netpoll_parse_options); | |
796 | EXPORT_SYMBOL(netpoll_setup); | |
797 | EXPORT_SYMBOL(netpoll_cleanup); | |
798 | EXPORT_SYMBOL(netpoll_send_udp); | |
799 | EXPORT_SYMBOL(netpoll_poll); | |
800 | EXPORT_SYMBOL(netpoll_queue); |