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 | ||
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 LT |
39 | |
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 | 52 | |
c4028958 | 53 | static void queue_process(struct work_struct *work) |
1da177e4 | 54 | { |
4c1ac1b4 DH |
55 | struct netpoll_info *npinfo = |
56 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 57 | struct sk_buff *skb; |
3640543d | 58 | unsigned long flags; |
1da177e4 | 59 | |
6c43ff18 SH |
60 | while ((skb = skb_dequeue(&npinfo->txq))) { |
61 | struct net_device *dev = skb->dev; | |
1da177e4 | 62 | |
6c43ff18 SH |
63 | if (!netif_device_present(dev) || !netif_running(dev)) { |
64 | __kfree_skb(skb); | |
65 | continue; | |
66 | } | |
1da177e4 | 67 | |
3640543d IM |
68 | local_irq_save(flags); |
69 | netif_tx_lock(dev); | |
6c43ff18 SH |
70 | if (netif_queue_stopped(dev) || |
71 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { | |
72 | skb_queue_head(&npinfo->txq, skb); | |
3640543d IM |
73 | netif_tx_unlock(dev); |
74 | local_irq_restore(flags); | |
1da177e4 | 75 | |
6c43ff18 SH |
76 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
77 | return; | |
78 | } | |
3640543d IM |
79 | netif_tx_unlock(dev); |
80 | local_irq_restore(flags); | |
1da177e4 | 81 | } |
1da177e4 LT |
82 | } |
83 | ||
b51655b9 AV |
84 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
85 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 86 | { |
d6f5493c | 87 | __wsum psum; |
fb286bb2 HX |
88 | |
89 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) | |
1da177e4 LT |
90 | return 0; |
91 | ||
fb286bb2 HX |
92 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
93 | ||
84fa7933 | 94 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 95 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 96 | return 0; |
1da177e4 | 97 | |
fb286bb2 | 98 | skb->csum = psum; |
1da177e4 | 99 | |
fb286bb2 | 100 | return __skb_checksum_complete(skb); |
1da177e4 LT |
101 | } |
102 | ||
103 | /* | |
104 | * Check whether delayed processing was scheduled for our NIC. If so, | |
105 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
106 | * If this fails, either we've recursed in ->poll() or it's already | |
107 | * running on another CPU. | |
108 | * | |
109 | * Note: we don't mask interrupts with this lock because we're using | |
110 | * trylock here and interrupts are already disabled in the softirq | |
111 | * case. Further, we test the poll_owner to avoid recursion on UP | |
112 | * systems where the lock doesn't exist. | |
113 | * | |
114 | * In cases where there is bi-directional communications, reading only | |
115 | * one message at a time can lead to packets being dropped by the | |
116 | * network adapter, forcing superfluous retries and possibly timeouts. | |
117 | * Thus, we set our budget to greater than 1. | |
118 | */ | |
119 | static void poll_napi(struct netpoll *np) | |
120 | { | |
115c1d6e | 121 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
122 | int budget = 16; |
123 | ||
124 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
125 | npinfo->poll_owner != smp_processor_id() && |
126 | spin_trylock(&npinfo->poll_lock)) { | |
127 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
128 | atomic_inc(&trapped); |
129 | ||
130 | np->dev->poll(np->dev, &budget); | |
131 | ||
132 | atomic_dec(&trapped); | |
115c1d6e JM |
133 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
134 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
135 | } |
136 | } | |
137 | ||
068c6e98 NH |
138 | static void service_arp_queue(struct netpoll_info *npi) |
139 | { | |
140 | struct sk_buff *skb; | |
141 | ||
142 | if (unlikely(!npi)) | |
143 | return; | |
144 | ||
145 | skb = skb_dequeue(&npi->arp_tx); | |
146 | ||
147 | while (skb != NULL) { | |
148 | arp_reply(skb); | |
149 | skb = skb_dequeue(&npi->arp_tx); | |
150 | } | |
068c6e98 NH |
151 | } |
152 | ||
1da177e4 LT |
153 | void netpoll_poll(struct netpoll *np) |
154 | { | |
c68b9070 | 155 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
1da177e4 LT |
156 | return; |
157 | ||
158 | /* Process pending work on NIC */ | |
159 | np->dev->poll_controller(np->dev); | |
160 | if (np->dev->poll) | |
161 | poll_napi(np); | |
162 | ||
068c6e98 NH |
163 | service_arp_queue(np->dev->npinfo); |
164 | ||
1da177e4 LT |
165 | zap_completion_queue(); |
166 | } | |
167 | ||
168 | static void refill_skbs(void) | |
169 | { | |
170 | struct sk_buff *skb; | |
171 | unsigned long flags; | |
172 | ||
a1bcfacd SH |
173 | spin_lock_irqsave(&skb_pool.lock, flags); |
174 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
175 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
176 | if (!skb) | |
177 | break; | |
178 | ||
a1bcfacd | 179 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 180 | } |
a1bcfacd | 181 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
182 | } |
183 | ||
184 | static void zap_completion_queue(void) | |
185 | { | |
186 | unsigned long flags; | |
187 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
188 | ||
189 | if (sd->completion_queue) { | |
190 | struct sk_buff *clist; | |
191 | ||
192 | local_irq_save(flags); | |
193 | clist = sd->completion_queue; | |
194 | sd->completion_queue = NULL; | |
195 | local_irq_restore(flags); | |
196 | ||
197 | while (clist != NULL) { | |
198 | struct sk_buff *skb = clist; | |
199 | clist = clist->next; | |
c68b9070 | 200 | if (skb->destructor) |
1da177e4 LT |
201 | dev_kfree_skb_any(skb); /* put this one back */ |
202 | else | |
203 | __kfree_skb(skb); | |
204 | } | |
205 | } | |
206 | ||
207 | put_cpu_var(softnet_data); | |
208 | } | |
209 | ||
a1bcfacd | 210 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 211 | { |
a1bcfacd SH |
212 | int count = 0; |
213 | struct sk_buff *skb; | |
1da177e4 LT |
214 | |
215 | zap_completion_queue(); | |
a1bcfacd | 216 | refill_skbs(); |
1da177e4 | 217 | repeat: |
1da177e4 LT |
218 | |
219 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
220 | if (!skb) |
221 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
222 | |
223 | if (!skb) { | |
a1bcfacd SH |
224 | if (++count < 10) { |
225 | netpoll_poll(np); | |
226 | goto repeat; | |
1da177e4 | 227 | } |
a1bcfacd | 228 | return NULL; |
1da177e4 LT |
229 | } |
230 | ||
231 | atomic_set(&skb->users, 1); | |
232 | skb_reserve(skb, reserve); | |
233 | return skb; | |
234 | } | |
235 | ||
236 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
237 | { | |
2bdfe0ba SH |
238 | int status = NETDEV_TX_BUSY; |
239 | unsigned long tries; | |
4ec93edb YH |
240 | struct net_device *dev = np->dev; |
241 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 242 | |
4ec93edb YH |
243 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
244 | __kfree_skb(skb); | |
245 | return; | |
246 | } | |
2bdfe0ba SH |
247 | |
248 | /* don't get messages out of order, and no recursion */ | |
c68b9070 | 249 | if (skb_queue_len(&npinfo->txq) == 0 && |
e37b8d93 | 250 | npinfo->poll_owner != smp_processor_id()) { |
a49f99ff AM |
251 | unsigned long flags; |
252 | ||
253 | local_irq_save(flags); | |
e37b8d93 AM |
254 | if (netif_tx_trylock(dev)) { |
255 | /* try until next clock tick */ | |
256 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
257 | tries > 0; --tries) { | |
258 | if (!netif_queue_stopped(dev)) | |
259 | status = dev->hard_start_xmit(skb, dev); | |
260 | ||
261 | if (status == NETDEV_TX_OK) | |
262 | break; | |
263 | ||
264 | /* tickle device maybe there is some cleanup */ | |
265 | netpoll_poll(np); | |
266 | ||
267 | udelay(USEC_PER_POLL); | |
268 | } | |
269 | netif_tx_unlock(dev); | |
0db1d6fc | 270 | } |
a49f99ff | 271 | local_irq_restore(flags); |
1da177e4 | 272 | } |
1da177e4 | 273 | |
2bdfe0ba | 274 | if (status != NETDEV_TX_OK) { |
5de4a473 | 275 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 276 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 277 | } |
1da177e4 LT |
278 | } |
279 | ||
280 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
281 | { | |
282 | int total_len, eth_len, ip_len, udp_len; | |
283 | struct sk_buff *skb; | |
284 | struct udphdr *udph; | |
285 | struct iphdr *iph; | |
286 | struct ethhdr *eth; | |
287 | ||
288 | udp_len = len + sizeof(*udph); | |
289 | ip_len = eth_len = udp_len + sizeof(*iph); | |
290 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
291 | ||
292 | skb = find_skb(np, total_len, total_len - len); | |
293 | if (!skb) | |
294 | return; | |
295 | ||
296 | memcpy(skb->data, msg, len); | |
297 | skb->len += len; | |
298 | ||
206daaf7 | 299 | skb->h.uh = udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); |
1da177e4 LT |
300 | udph->source = htons(np->local_port); |
301 | udph->dest = htons(np->remote_port); | |
302 | udph->len = htons(udp_len); | |
303 | udph->check = 0; | |
8e365eec CL |
304 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
305 | htonl(np->remote_ip), | |
306 | udp_len, IPPROTO_UDP, | |
307 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
308 | if (udph->check == 0) | |
5e57dff2 | 309 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 310 | |
206daaf7 | 311 | skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); |
1da177e4 LT |
312 | |
313 | /* iph->version = 4; iph->ihl = 5; */ | |
314 | put_unaligned(0x45, (unsigned char *)iph); | |
315 | iph->tos = 0; | |
316 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
317 | iph->id = 0; | |
318 | iph->frag_off = 0; | |
319 | iph->ttl = 64; | |
320 | iph->protocol = IPPROTO_UDP; | |
321 | iph->check = 0; | |
322 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
323 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
324 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
325 | ||
326 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
206daaf7 SH |
327 | skb->mac.raw = skb->data; |
328 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
1da177e4 LT |
329 | memcpy(eth->h_source, np->local_mac, 6); |
330 | memcpy(eth->h_dest, np->remote_mac, 6); | |
331 | ||
332 | skb->dev = np->dev; | |
333 | ||
334 | netpoll_send_skb(np, skb); | |
335 | } | |
336 | ||
337 | static void arp_reply(struct sk_buff *skb) | |
338 | { | |
115c1d6e | 339 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
340 | struct arphdr *arp; |
341 | unsigned char *arp_ptr; | |
342 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 343 | __be32 sip, tip; |
47bbec02 | 344 | unsigned char *sha; |
1da177e4 | 345 | struct sk_buff *send_skb; |
115c1d6e | 346 | struct netpoll *np = NULL; |
1da177e4 | 347 | |
fbeec2e1 JM |
348 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
349 | np = npinfo->rx_np; | |
115c1d6e JM |
350 | if (!np) |
351 | return; | |
1da177e4 LT |
352 | |
353 | /* No arp on this interface */ | |
354 | if (skb->dev->flags & IFF_NOARP) | |
355 | return; | |
356 | ||
357 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
358 | (2 * skb->dev->addr_len) + | |
359 | (2 * sizeof(u32))))) | |
360 | return; | |
361 | ||
362 | skb->h.raw = skb->nh.raw = skb->data; | |
363 | arp = skb->nh.arph; | |
364 | ||
365 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
366 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
367 | arp->ar_pro != htons(ETH_P_IP) || | |
368 | arp->ar_op != htons(ARPOP_REQUEST)) | |
369 | return; | |
370 | ||
47bbec02 NH |
371 | arp_ptr = (unsigned char *)(arp+1); |
372 | /* save the location of the src hw addr */ | |
373 | sha = arp_ptr; | |
374 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 375 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
376 | arp_ptr += 4; |
377 | /* if we actually cared about dst hw addr, it would get copied here */ | |
378 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
379 | memcpy(&tip, arp_ptr, 4); |
380 | ||
381 | /* Should we ignore arp? */ | |
382 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
383 | return; | |
384 | ||
385 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
386 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
387 | LL_RESERVED_SPACE(np->dev)); | |
388 | ||
389 | if (!send_skb) | |
390 | return; | |
391 | ||
392 | send_skb->nh.raw = send_skb->data; | |
393 | arp = (struct arphdr *) skb_put(send_skb, size); | |
394 | send_skb->dev = skb->dev; | |
395 | send_skb->protocol = htons(ETH_P_ARP); | |
396 | ||
397 | /* Fill the device header for the ARP frame */ | |
398 | ||
399 | if (np->dev->hard_header && | |
400 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
47bbec02 | 401 | sha, np->local_mac, |
c68b9070 | 402 | send_skb->len) < 0) { |
1da177e4 LT |
403 | kfree_skb(send_skb); |
404 | return; | |
405 | } | |
406 | ||
407 | /* | |
408 | * Fill out the arp protocol part. | |
409 | * | |
410 | * we only support ethernet device type, | |
411 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
412 | */ | |
413 | ||
414 | arp->ar_hrd = htons(np->dev->type); | |
415 | arp->ar_pro = htons(ETH_P_IP); | |
416 | arp->ar_hln = np->dev->addr_len; | |
417 | arp->ar_pln = 4; | |
418 | arp->ar_op = htons(type); | |
419 | ||
420 | arp_ptr=(unsigned char *)(arp + 1); | |
421 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
422 | arp_ptr += np->dev->addr_len; | |
423 | memcpy(arp_ptr, &tip, 4); | |
424 | arp_ptr += 4; | |
47bbec02 | 425 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
426 | arp_ptr += np->dev->addr_len; |
427 | memcpy(arp_ptr, &sip, 4); | |
428 | ||
429 | netpoll_send_skb(np, send_skb); | |
430 | } | |
431 | ||
432 | int __netpoll_rx(struct sk_buff *skb) | |
433 | { | |
434 | int proto, len, ulen; | |
435 | struct iphdr *iph; | |
436 | struct udphdr *uh; | |
068c6e98 NH |
437 | struct netpoll_info *npi = skb->dev->npinfo; |
438 | struct netpoll *np = npi->rx_np; | |
439 | ||
fbeec2e1 | 440 | if (!np) |
1da177e4 LT |
441 | goto out; |
442 | if (skb->dev->type != ARPHRD_ETHER) | |
443 | goto out; | |
444 | ||
445 | /* check if netpoll clients need ARP */ | |
446 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
447 | atomic_read(&trapped)) { | |
068c6e98 | 448 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
449 | return 1; |
450 | } | |
451 | ||
452 | proto = ntohs(eth_hdr(skb)->h_proto); | |
453 | if (proto != ETH_P_IP) | |
454 | goto out; | |
455 | if (skb->pkt_type == PACKET_OTHERHOST) | |
456 | goto out; | |
457 | if (skb_shared(skb)) | |
458 | goto out; | |
459 | ||
460 | iph = (struct iphdr *)skb->data; | |
461 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
462 | goto out; | |
463 | if (iph->ihl < 5 || iph->version != 4) | |
464 | goto out; | |
465 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
466 | goto out; | |
467 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
468 | goto out; | |
469 | ||
470 | len = ntohs(iph->tot_len); | |
471 | if (skb->len < len || len < iph->ihl*4) | |
472 | goto out; | |
473 | ||
474 | if (iph->protocol != IPPROTO_UDP) | |
475 | goto out; | |
476 | ||
477 | len -= iph->ihl*4; | |
478 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
479 | ulen = ntohs(uh->len); | |
480 | ||
481 | if (ulen != len) | |
482 | goto out; | |
fb286bb2 | 483 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
484 | goto out; |
485 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
486 | goto out; | |
487 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
488 | goto out; | |
489 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
490 | goto out; | |
491 | ||
492 | np->rx_hook(np, ntohs(uh->source), | |
493 | (char *)(uh+1), | |
494 | ulen - sizeof(struct udphdr)); | |
495 | ||
496 | kfree_skb(skb); | |
497 | return 1; | |
498 | ||
499 | out: | |
500 | if (atomic_read(&trapped)) { | |
501 | kfree_skb(skb); | |
502 | return 1; | |
503 | } | |
504 | ||
505 | return 0; | |
506 | } | |
507 | ||
508 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
509 | { | |
510 | char *cur=opt, *delim; | |
511 | ||
c68b9070 | 512 | if (*cur != '@') { |
1da177e4 LT |
513 | if ((delim = strchr(cur, '@')) == NULL) |
514 | goto parse_failed; | |
c68b9070 DM |
515 | *delim = 0; |
516 | np->local_port = simple_strtol(cur, NULL, 10); | |
517 | cur = delim; | |
1da177e4 LT |
518 | } |
519 | cur++; | |
520 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
521 | ||
c68b9070 | 522 | if (*cur != '/') { |
1da177e4 LT |
523 | if ((delim = strchr(cur, '/')) == NULL) |
524 | goto parse_failed; | |
c68b9070 DM |
525 | *delim = 0; |
526 | np->local_ip = ntohl(in_aton(cur)); | |
527 | cur = delim; | |
1da177e4 LT |
528 | |
529 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
530 | np->name, HIPQUAD(np->local_ip)); | |
531 | } | |
532 | cur++; | |
533 | ||
c68b9070 | 534 | if (*cur != ',') { |
1da177e4 LT |
535 | /* parse out dev name */ |
536 | if ((delim = strchr(cur, ',')) == NULL) | |
537 | goto parse_failed; | |
c68b9070 | 538 | *delim = 0; |
1da177e4 | 539 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 540 | cur = delim; |
1da177e4 LT |
541 | } |
542 | cur++; | |
543 | ||
544 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
545 | ||
c68b9070 | 546 | if (*cur != '@') { |
1da177e4 LT |
547 | /* dst port */ |
548 | if ((delim = strchr(cur, '@')) == NULL) | |
549 | goto parse_failed; | |
c68b9070 DM |
550 | *delim = 0; |
551 | np->remote_port = simple_strtol(cur, NULL, 10); | |
552 | cur = delim; | |
1da177e4 LT |
553 | } |
554 | cur++; | |
555 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
556 | ||
557 | /* dst ip */ | |
558 | if ((delim = strchr(cur, '/')) == NULL) | |
559 | goto parse_failed; | |
c68b9070 DM |
560 | *delim = 0; |
561 | np->remote_ip = ntohl(in_aton(cur)); | |
562 | cur = delim + 1; | |
1da177e4 LT |
563 | |
564 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
c68b9070 | 565 | np->name, HIPQUAD(np->remote_ip)); |
1da177e4 | 566 | |
c68b9070 | 567 | if (*cur != 0) { |
1da177e4 LT |
568 | /* MAC address */ |
569 | if ((delim = strchr(cur, ':')) == NULL) | |
570 | goto parse_failed; | |
c68b9070 DM |
571 | *delim = 0; |
572 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
573 | cur = delim + 1; | |
1da177e4 LT |
574 | if ((delim = strchr(cur, ':')) == NULL) |
575 | goto parse_failed; | |
c68b9070 DM |
576 | *delim = 0; |
577 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
578 | cur = delim + 1; | |
1da177e4 LT |
579 | if ((delim = strchr(cur, ':')) == NULL) |
580 | goto parse_failed; | |
c68b9070 DM |
581 | *delim = 0; |
582 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
583 | cur = delim + 1; | |
1da177e4 LT |
584 | if ((delim = strchr(cur, ':')) == NULL) |
585 | goto parse_failed; | |
c68b9070 DM |
586 | *delim = 0; |
587 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
588 | cur = delim + 1; | |
1da177e4 LT |
589 | if ((delim = strchr(cur, ':')) == NULL) |
590 | goto parse_failed; | |
c68b9070 DM |
591 | *delim = 0; |
592 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
593 | cur = delim + 1; | |
594 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
595 | } |
596 | ||
597 | printk(KERN_INFO "%s: remote ethernet address " | |
598 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
599 | np->name, | |
600 | np->remote_mac[0], | |
601 | np->remote_mac[1], | |
602 | np->remote_mac[2], | |
603 | np->remote_mac[3], | |
604 | np->remote_mac[4], | |
605 | np->remote_mac[5]); | |
606 | ||
607 | return 0; | |
608 | ||
609 | parse_failed: | |
610 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
611 | np->name, cur); | |
612 | return -1; | |
613 | } | |
614 | ||
615 | int netpoll_setup(struct netpoll *np) | |
616 | { | |
617 | struct net_device *ndev = NULL; | |
618 | struct in_device *in_dev; | |
115c1d6e | 619 | struct netpoll_info *npinfo; |
fbeec2e1 | 620 | unsigned long flags; |
b41848b6 | 621 | int err; |
1da177e4 LT |
622 | |
623 | if (np->dev_name) | |
624 | ndev = dev_get_by_name(np->dev_name); | |
625 | if (!ndev) { | |
626 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
627 | np->name, np->dev_name); | |
b41848b6 | 628 | return -ENODEV; |
1da177e4 LT |
629 | } |
630 | ||
631 | np->dev = ndev; | |
115c1d6e JM |
632 | if (!ndev->npinfo) { |
633 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
634 | if (!npinfo) { |
635 | err = -ENOMEM; | |
115c1d6e | 636 | goto release; |
b41848b6 | 637 | } |
115c1d6e | 638 | |
11513128 | 639 | npinfo->rx_flags = 0; |
fbeec2e1 | 640 | npinfo->rx_np = NULL; |
a9f6a0dd | 641 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 642 | npinfo->poll_owner = -1; |
2bdfe0ba | 643 | |
a9f6a0dd | 644 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 645 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 646 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 647 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 648 | |
93ec2c72 SH |
649 | atomic_set(&npinfo->refcnt, 1); |
650 | } else { | |
115c1d6e | 651 | npinfo = ndev->npinfo; |
93ec2c72 SH |
652 | atomic_inc(&npinfo->refcnt); |
653 | } | |
1da177e4 LT |
654 | |
655 | if (!ndev->poll_controller) { | |
656 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
657 | np->name, np->dev_name); | |
b41848b6 | 658 | err = -ENOTSUPP; |
1da177e4 LT |
659 | goto release; |
660 | } | |
661 | ||
662 | if (!netif_running(ndev)) { | |
663 | unsigned long atmost, atleast; | |
664 | ||
665 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
666 | np->name, np->dev_name); | |
667 | ||
6756ae4b | 668 | rtnl_lock(); |
b41848b6 SH |
669 | err = dev_open(ndev); |
670 | rtnl_unlock(); | |
671 | ||
672 | if (err) { | |
1da177e4 | 673 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 674 | np->name, ndev->name); |
1da177e4 LT |
675 | goto release; |
676 | } | |
1da177e4 LT |
677 | |
678 | atleast = jiffies + HZ/10; | |
4ec93edb | 679 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
680 | while (!netif_carrier_ok(ndev)) { |
681 | if (time_after(jiffies, atmost)) { | |
682 | printk(KERN_NOTICE | |
683 | "%s: timeout waiting for carrier\n", | |
684 | np->name); | |
685 | break; | |
686 | } | |
687 | cond_resched(); | |
688 | } | |
689 | ||
690 | /* If carrier appears to come up instantly, we don't | |
691 | * trust it and pause so that we don't pump all our | |
692 | * queued console messages into the bitbucket. | |
693 | */ | |
694 | ||
695 | if (time_before(jiffies, atleast)) { | |
696 | printk(KERN_NOTICE "%s: carrier detect appears" | |
697 | " untrustworthy, waiting 4 seconds\n", | |
698 | np->name); | |
699 | msleep(4000); | |
700 | } | |
701 | } | |
702 | ||
3860288e | 703 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
704 | memcpy(np->local_mac, ndev->dev_addr, 6); |
705 | ||
706 | if (!np->local_ip) { | |
707 | rcu_read_lock(); | |
e5ed6399 | 708 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
709 | |
710 | if (!in_dev || !in_dev->ifa_list) { | |
711 | rcu_read_unlock(); | |
712 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
713 | np->name, np->dev_name); | |
b41848b6 | 714 | err = -EDESTADDRREQ; |
1da177e4 LT |
715 | goto release; |
716 | } | |
717 | ||
718 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
719 | rcu_read_unlock(); | |
720 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
721 | np->name, HIPQUAD(np->local_ip)); | |
722 | } | |
723 | ||
fbeec2e1 JM |
724 | if (np->rx_hook) { |
725 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
726 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
727 | npinfo->rx_np = np; | |
728 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
729 | } | |
26520765 IM |
730 | |
731 | /* fill up the skb queue */ | |
732 | refill_skbs(); | |
733 | ||
fbeec2e1 | 734 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 735 | ndev->npinfo = npinfo; |
1da177e4 | 736 | |
53fb95d3 MM |
737 | /* avoid racing with NAPI reading npinfo */ |
738 | synchronize_rcu(); | |
739 | ||
1da177e4 LT |
740 | return 0; |
741 | ||
742 | release: | |
115c1d6e JM |
743 | if (!ndev->npinfo) |
744 | kfree(npinfo); | |
1da177e4 LT |
745 | np->dev = NULL; |
746 | dev_put(ndev); | |
b41848b6 | 747 | return err; |
1da177e4 LT |
748 | } |
749 | ||
c68b9070 DM |
750 | static int __init netpoll_init(void) |
751 | { | |
a1bcfacd SH |
752 | skb_queue_head_init(&skb_pool); |
753 | return 0; | |
754 | } | |
755 | core_initcall(netpoll_init); | |
756 | ||
1da177e4 LT |
757 | void netpoll_cleanup(struct netpoll *np) |
758 | { | |
fbeec2e1 JM |
759 | struct netpoll_info *npinfo; |
760 | unsigned long flags; | |
761 | ||
115c1d6e | 762 | if (np->dev) { |
fbeec2e1 | 763 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
764 | if (npinfo) { |
765 | if (npinfo->rx_np == np) { | |
766 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
767 | npinfo->rx_np = NULL; | |
768 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
769 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
770 | } | |
771 | ||
772 | np->dev->npinfo = NULL; | |
773 | if (atomic_dec_and_test(&npinfo->refcnt)) { | |
774 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 775 | skb_queue_purge(&npinfo->txq); |
6c43ff18 | 776 | cancel_rearming_delayed_work(&npinfo->tx_work); |
4ec93edb | 777 | flush_scheduled_work(); |
93ec2c72 SH |
778 | |
779 | kfree(npinfo); | |
780 | } | |
fbeec2e1 | 781 | } |
93ec2c72 | 782 | |
115c1d6e JM |
783 | dev_put(np->dev); |
784 | } | |
fbeec2e1 | 785 | |
1da177e4 LT |
786 | np->dev = NULL; |
787 | } | |
788 | ||
789 | int netpoll_trap(void) | |
790 | { | |
791 | return atomic_read(&trapped); | |
792 | } | |
793 | ||
794 | void netpoll_set_trap(int trap) | |
795 | { | |
796 | if (trap) | |
797 | atomic_inc(&trapped); | |
798 | else | |
799 | atomic_dec(&trapped); | |
800 | } | |
801 | ||
802 | EXPORT_SYMBOL(netpoll_set_trap); | |
803 | EXPORT_SYMBOL(netpoll_trap); | |
804 | EXPORT_SYMBOL(netpoll_parse_options); | |
805 | EXPORT_SYMBOL(netpoll_setup); | |
806 | EXPORT_SYMBOL(netpoll_cleanup); | |
807 | EXPORT_SYMBOL(netpoll_send_udp); | |
808 | EXPORT_SYMBOL(netpoll_poll); |