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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 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 LT |
57 | struct sk_buff *skb; |
58 | ||
6c43ff18 SH |
59 | while ((skb = skb_dequeue(&npinfo->txq))) { |
60 | struct net_device *dev = skb->dev; | |
1da177e4 | 61 | |
6c43ff18 SH |
62 | if (!netif_device_present(dev) || !netif_running(dev)) { |
63 | __kfree_skb(skb); | |
64 | continue; | |
65 | } | |
1da177e4 | 66 | |
6c43ff18 SH |
67 | netif_tx_lock_bh(dev); |
68 | if (netif_queue_stopped(dev) || | |
69 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { | |
70 | skb_queue_head(&npinfo->txq, skb); | |
71 | netif_tx_unlock_bh(dev); | |
1da177e4 | 72 | |
6c43ff18 SH |
73 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
74 | return; | |
75 | } | |
1da177e4 | 76 | } |
1da177e4 LT |
77 | } |
78 | ||
b51655b9 AV |
79 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
80 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 81 | { |
d6f5493c | 82 | __wsum psum; |
fb286bb2 HX |
83 | |
84 | if (uh->check == 0 || skb->ip_summed == CHECKSUM_UNNECESSARY) | |
1da177e4 LT |
85 | return 0; |
86 | ||
fb286bb2 HX |
87 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
88 | ||
84fa7933 | 89 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 90 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 91 | return 0; |
1da177e4 | 92 | |
fb286bb2 | 93 | skb->csum = psum; |
1da177e4 | 94 | |
fb286bb2 | 95 | return __skb_checksum_complete(skb); |
1da177e4 LT |
96 | } |
97 | ||
98 | /* | |
99 | * Check whether delayed processing was scheduled for our NIC. If so, | |
100 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
101 | * If this fails, either we've recursed in ->poll() or it's already | |
102 | * running on another CPU. | |
103 | * | |
104 | * Note: we don't mask interrupts with this lock because we're using | |
105 | * trylock here and interrupts are already disabled in the softirq | |
106 | * case. Further, we test the poll_owner to avoid recursion on UP | |
107 | * systems where the lock doesn't exist. | |
108 | * | |
109 | * In cases where there is bi-directional communications, reading only | |
110 | * one message at a time can lead to packets being dropped by the | |
111 | * network adapter, forcing superfluous retries and possibly timeouts. | |
112 | * Thus, we set our budget to greater than 1. | |
113 | */ | |
114 | static void poll_napi(struct netpoll *np) | |
115 | { | |
115c1d6e | 116 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
117 | int budget = 16; |
118 | ||
119 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
120 | npinfo->poll_owner != smp_processor_id() && |
121 | spin_trylock(&npinfo->poll_lock)) { | |
122 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
123 | atomic_inc(&trapped); |
124 | ||
125 | np->dev->poll(np->dev, &budget); | |
126 | ||
127 | atomic_dec(&trapped); | |
115c1d6e JM |
128 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
129 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
130 | } |
131 | } | |
132 | ||
068c6e98 NH |
133 | static void service_arp_queue(struct netpoll_info *npi) |
134 | { | |
135 | struct sk_buff *skb; | |
136 | ||
137 | if (unlikely(!npi)) | |
138 | return; | |
139 | ||
140 | skb = skb_dequeue(&npi->arp_tx); | |
141 | ||
142 | while (skb != NULL) { | |
143 | arp_reply(skb); | |
144 | skb = skb_dequeue(&npi->arp_tx); | |
145 | } | |
068c6e98 NH |
146 | } |
147 | ||
1da177e4 LT |
148 | void netpoll_poll(struct netpoll *np) |
149 | { | |
c68b9070 | 150 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
1da177e4 LT |
151 | return; |
152 | ||
153 | /* Process pending work on NIC */ | |
154 | np->dev->poll_controller(np->dev); | |
155 | if (np->dev->poll) | |
156 | poll_napi(np); | |
157 | ||
068c6e98 NH |
158 | service_arp_queue(np->dev->npinfo); |
159 | ||
1da177e4 LT |
160 | zap_completion_queue(); |
161 | } | |
162 | ||
163 | static void refill_skbs(void) | |
164 | { | |
165 | struct sk_buff *skb; | |
166 | unsigned long flags; | |
167 | ||
a1bcfacd SH |
168 | spin_lock_irqsave(&skb_pool.lock, flags); |
169 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
170 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
171 | if (!skb) | |
172 | break; | |
173 | ||
a1bcfacd | 174 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 175 | } |
a1bcfacd | 176 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
177 | } |
178 | ||
179 | static void zap_completion_queue(void) | |
180 | { | |
181 | unsigned long flags; | |
182 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
183 | ||
184 | if (sd->completion_queue) { | |
185 | struct sk_buff *clist; | |
186 | ||
187 | local_irq_save(flags); | |
188 | clist = sd->completion_queue; | |
189 | sd->completion_queue = NULL; | |
190 | local_irq_restore(flags); | |
191 | ||
192 | while (clist != NULL) { | |
193 | struct sk_buff *skb = clist; | |
194 | clist = clist->next; | |
c68b9070 | 195 | if (skb->destructor) |
1da177e4 LT |
196 | dev_kfree_skb_any(skb); /* put this one back */ |
197 | else | |
198 | __kfree_skb(skb); | |
199 | } | |
200 | } | |
201 | ||
202 | put_cpu_var(softnet_data); | |
203 | } | |
204 | ||
a1bcfacd | 205 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 206 | { |
a1bcfacd SH |
207 | int count = 0; |
208 | struct sk_buff *skb; | |
1da177e4 LT |
209 | |
210 | zap_completion_queue(); | |
a1bcfacd | 211 | refill_skbs(); |
1da177e4 | 212 | repeat: |
1da177e4 LT |
213 | |
214 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
215 | if (!skb) |
216 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
217 | |
218 | if (!skb) { | |
a1bcfacd SH |
219 | if (++count < 10) { |
220 | netpoll_poll(np); | |
221 | goto repeat; | |
1da177e4 | 222 | } |
a1bcfacd | 223 | return NULL; |
1da177e4 LT |
224 | } |
225 | ||
226 | atomic_set(&skb->users, 1); | |
227 | skb_reserve(skb, reserve); | |
228 | return skb; | |
229 | } | |
230 | ||
231 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
232 | { | |
2bdfe0ba SH |
233 | int status = NETDEV_TX_BUSY; |
234 | unsigned long tries; | |
235 | struct net_device *dev = np->dev; | |
236 | struct netpoll_info *npinfo = np->dev->npinfo; | |
237 | ||
238 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { | |
239 | __kfree_skb(skb); | |
240 | return; | |
241 | } | |
242 | ||
243 | /* don't get messages out of order, and no recursion */ | |
c68b9070 DM |
244 | if (skb_queue_len(&npinfo->txq) == 0 && |
245 | npinfo->poll_owner != smp_processor_id() && | |
246 | netif_tx_trylock(dev)) { | |
2bdfe0ba | 247 | /* try until next clock tick */ |
c68b9070 | 248 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; tries > 0; --tries) { |
2bdfe0ba SH |
249 | if (!netif_queue_stopped(dev)) |
250 | status = dev->hard_start_xmit(skb, dev); | |
f0d3459d | 251 | |
2bdfe0ba SH |
252 | if (status == NETDEV_TX_OK) |
253 | break; | |
1da177e4 | 254 | |
2bdfe0ba SH |
255 | /* tickle device maybe there is some cleanup */ |
256 | netpoll_poll(np); | |
1da177e4 | 257 | |
2bdfe0ba | 258 | udelay(USEC_PER_POLL); |
0db1d6fc | 259 | } |
2bdfe0ba | 260 | netif_tx_unlock(dev); |
1da177e4 | 261 | } |
1da177e4 | 262 | |
2bdfe0ba | 263 | if (status != NETDEV_TX_OK) { |
5de4a473 | 264 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 265 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 266 | } |
1da177e4 LT |
267 | } |
268 | ||
269 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
270 | { | |
271 | int total_len, eth_len, ip_len, udp_len; | |
272 | struct sk_buff *skb; | |
273 | struct udphdr *udph; | |
274 | struct iphdr *iph; | |
275 | struct ethhdr *eth; | |
276 | ||
277 | udp_len = len + sizeof(*udph); | |
278 | ip_len = eth_len = udp_len + sizeof(*iph); | |
279 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
280 | ||
281 | skb = find_skb(np, total_len, total_len - len); | |
282 | if (!skb) | |
283 | return; | |
284 | ||
285 | memcpy(skb->data, msg, len); | |
286 | skb->len += len; | |
287 | ||
206daaf7 | 288 | skb->h.uh = udph = (struct udphdr *) skb_push(skb, sizeof(*udph)); |
1da177e4 LT |
289 | udph->source = htons(np->local_port); |
290 | udph->dest = htons(np->remote_port); | |
291 | udph->len = htons(udp_len); | |
292 | udph->check = 0; | |
8e365eec CL |
293 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
294 | htonl(np->remote_ip), | |
295 | udp_len, IPPROTO_UDP, | |
296 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
297 | if (udph->check == 0) | |
5e57dff2 | 298 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 299 | |
206daaf7 | 300 | skb->nh.iph = iph = (struct iphdr *)skb_push(skb, sizeof(*iph)); |
1da177e4 LT |
301 | |
302 | /* iph->version = 4; iph->ihl = 5; */ | |
303 | put_unaligned(0x45, (unsigned char *)iph); | |
304 | iph->tos = 0; | |
305 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
306 | iph->id = 0; | |
307 | iph->frag_off = 0; | |
308 | iph->ttl = 64; | |
309 | iph->protocol = IPPROTO_UDP; | |
310 | iph->check = 0; | |
311 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
312 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
313 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
314 | ||
315 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
206daaf7 SH |
316 | skb->mac.raw = skb->data; |
317 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
1da177e4 LT |
318 | memcpy(eth->h_source, np->local_mac, 6); |
319 | memcpy(eth->h_dest, np->remote_mac, 6); | |
320 | ||
321 | skb->dev = np->dev; | |
322 | ||
323 | netpoll_send_skb(np, skb); | |
324 | } | |
325 | ||
326 | static void arp_reply(struct sk_buff *skb) | |
327 | { | |
115c1d6e | 328 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
329 | struct arphdr *arp; |
330 | unsigned char *arp_ptr; | |
331 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 332 | __be32 sip, tip; |
47bbec02 | 333 | unsigned char *sha; |
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 | ||
47bbec02 NH |
360 | arp_ptr = (unsigned char *)(arp+1); |
361 | /* save the location of the src hw addr */ | |
362 | sha = arp_ptr; | |
363 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 364 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
365 | arp_ptr += 4; |
366 | /* if we actually cared about dst hw addr, it would get copied here */ | |
367 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
368 | memcpy(&tip, arp_ptr, 4); |
369 | ||
370 | /* Should we ignore arp? */ | |
371 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
372 | return; | |
373 | ||
374 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
375 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
376 | LL_RESERVED_SPACE(np->dev)); | |
377 | ||
378 | if (!send_skb) | |
379 | return; | |
380 | ||
381 | send_skb->nh.raw = send_skb->data; | |
382 | arp = (struct arphdr *) skb_put(send_skb, size); | |
383 | send_skb->dev = skb->dev; | |
384 | send_skb->protocol = htons(ETH_P_ARP); | |
385 | ||
386 | /* Fill the device header for the ARP frame */ | |
387 | ||
388 | if (np->dev->hard_header && | |
389 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
47bbec02 | 390 | sha, np->local_mac, |
c68b9070 | 391 | send_skb->len) < 0) { |
1da177e4 LT |
392 | kfree_skb(send_skb); |
393 | return; | |
394 | } | |
395 | ||
396 | /* | |
397 | * Fill out the arp protocol part. | |
398 | * | |
399 | * we only support ethernet device type, | |
400 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
401 | */ | |
402 | ||
403 | arp->ar_hrd = htons(np->dev->type); | |
404 | arp->ar_pro = htons(ETH_P_IP); | |
405 | arp->ar_hln = np->dev->addr_len; | |
406 | arp->ar_pln = 4; | |
407 | arp->ar_op = htons(type); | |
408 | ||
409 | arp_ptr=(unsigned char *)(arp + 1); | |
410 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
411 | arp_ptr += np->dev->addr_len; | |
412 | memcpy(arp_ptr, &tip, 4); | |
413 | arp_ptr += 4; | |
47bbec02 | 414 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
415 | arp_ptr += np->dev->addr_len; |
416 | memcpy(arp_ptr, &sip, 4); | |
417 | ||
418 | netpoll_send_skb(np, send_skb); | |
419 | } | |
420 | ||
421 | int __netpoll_rx(struct sk_buff *skb) | |
422 | { | |
423 | int proto, len, ulen; | |
424 | struct iphdr *iph; | |
425 | struct udphdr *uh; | |
068c6e98 NH |
426 | struct netpoll_info *npi = skb->dev->npinfo; |
427 | struct netpoll *np = npi->rx_np; | |
428 | ||
fbeec2e1 | 429 | if (!np) |
1da177e4 LT |
430 | goto out; |
431 | if (skb->dev->type != ARPHRD_ETHER) | |
432 | goto out; | |
433 | ||
434 | /* check if netpoll clients need ARP */ | |
435 | if (skb->protocol == __constant_htons(ETH_P_ARP) && | |
436 | atomic_read(&trapped)) { | |
068c6e98 | 437 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
438 | return 1; |
439 | } | |
440 | ||
441 | proto = ntohs(eth_hdr(skb)->h_proto); | |
442 | if (proto != ETH_P_IP) | |
443 | goto out; | |
444 | if (skb->pkt_type == PACKET_OTHERHOST) | |
445 | goto out; | |
446 | if (skb_shared(skb)) | |
447 | goto out; | |
448 | ||
449 | iph = (struct iphdr *)skb->data; | |
450 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
451 | goto out; | |
452 | if (iph->ihl < 5 || iph->version != 4) | |
453 | goto out; | |
454 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
455 | goto out; | |
456 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
457 | goto out; | |
458 | ||
459 | len = ntohs(iph->tot_len); | |
460 | if (skb->len < len || len < iph->ihl*4) | |
461 | goto out; | |
462 | ||
463 | if (iph->protocol != IPPROTO_UDP) | |
464 | goto out; | |
465 | ||
466 | len -= iph->ihl*4; | |
467 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
468 | ulen = ntohs(uh->len); | |
469 | ||
470 | if (ulen != len) | |
471 | goto out; | |
fb286bb2 | 472 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
473 | goto out; |
474 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
475 | goto out; | |
476 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
477 | goto out; | |
478 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
479 | goto out; | |
480 | ||
481 | np->rx_hook(np, ntohs(uh->source), | |
482 | (char *)(uh+1), | |
483 | ulen - sizeof(struct udphdr)); | |
484 | ||
485 | kfree_skb(skb); | |
486 | return 1; | |
487 | ||
488 | out: | |
489 | if (atomic_read(&trapped)) { | |
490 | kfree_skb(skb); | |
491 | return 1; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | } | |
496 | ||
497 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
498 | { | |
499 | char *cur=opt, *delim; | |
500 | ||
c68b9070 | 501 | if (*cur != '@') { |
1da177e4 LT |
502 | if ((delim = strchr(cur, '@')) == NULL) |
503 | goto parse_failed; | |
c68b9070 DM |
504 | *delim = 0; |
505 | np->local_port = simple_strtol(cur, NULL, 10); | |
506 | cur = delim; | |
1da177e4 LT |
507 | } |
508 | cur++; | |
509 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
510 | ||
c68b9070 | 511 | if (*cur != '/') { |
1da177e4 LT |
512 | if ((delim = strchr(cur, '/')) == NULL) |
513 | goto parse_failed; | |
c68b9070 DM |
514 | *delim = 0; |
515 | np->local_ip = ntohl(in_aton(cur)); | |
516 | cur = delim; | |
1da177e4 LT |
517 | |
518 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
519 | np->name, HIPQUAD(np->local_ip)); | |
520 | } | |
521 | cur++; | |
522 | ||
c68b9070 | 523 | if (*cur != ',') { |
1da177e4 LT |
524 | /* parse out dev name */ |
525 | if ((delim = strchr(cur, ',')) == NULL) | |
526 | goto parse_failed; | |
c68b9070 | 527 | *delim = 0; |
1da177e4 | 528 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 529 | cur = delim; |
1da177e4 LT |
530 | } |
531 | cur++; | |
532 | ||
533 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
534 | ||
c68b9070 | 535 | if (*cur != '@') { |
1da177e4 LT |
536 | /* dst port */ |
537 | if ((delim = strchr(cur, '@')) == NULL) | |
538 | goto parse_failed; | |
c68b9070 DM |
539 | *delim = 0; |
540 | np->remote_port = simple_strtol(cur, NULL, 10); | |
541 | cur = delim; | |
1da177e4 LT |
542 | } |
543 | cur++; | |
544 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
545 | ||
546 | /* dst ip */ | |
547 | if ((delim = strchr(cur, '/')) == NULL) | |
548 | goto parse_failed; | |
c68b9070 DM |
549 | *delim = 0; |
550 | np->remote_ip = ntohl(in_aton(cur)); | |
551 | cur = delim + 1; | |
1da177e4 LT |
552 | |
553 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
c68b9070 | 554 | np->name, HIPQUAD(np->remote_ip)); |
1da177e4 | 555 | |
c68b9070 | 556 | if (*cur != 0) { |
1da177e4 LT |
557 | /* MAC address */ |
558 | if ((delim = strchr(cur, ':')) == NULL) | |
559 | goto parse_failed; | |
c68b9070 DM |
560 | *delim = 0; |
561 | np->remote_mac[0] = 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[1] = 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[2] = 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[3] = simple_strtol(cur, NULL, 16); | |
577 | cur = delim + 1; | |
1da177e4 LT |
578 | if ((delim = strchr(cur, ':')) == NULL) |
579 | goto parse_failed; | |
c68b9070 DM |
580 | *delim = 0; |
581 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
582 | cur = delim + 1; | |
583 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
584 | } |
585 | ||
586 | printk(KERN_INFO "%s: remote ethernet address " | |
587 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
588 | np->name, | |
589 | np->remote_mac[0], | |
590 | np->remote_mac[1], | |
591 | np->remote_mac[2], | |
592 | np->remote_mac[3], | |
593 | np->remote_mac[4], | |
594 | np->remote_mac[5]); | |
595 | ||
596 | return 0; | |
597 | ||
598 | parse_failed: | |
599 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
600 | np->name, cur); | |
601 | return -1; | |
602 | } | |
603 | ||
604 | int netpoll_setup(struct netpoll *np) | |
605 | { | |
606 | struct net_device *ndev = NULL; | |
607 | struct in_device *in_dev; | |
115c1d6e | 608 | struct netpoll_info *npinfo; |
fbeec2e1 | 609 | unsigned long flags; |
b41848b6 | 610 | int err; |
1da177e4 LT |
611 | |
612 | if (np->dev_name) | |
613 | ndev = dev_get_by_name(np->dev_name); | |
614 | if (!ndev) { | |
615 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
616 | np->name, np->dev_name); | |
b41848b6 | 617 | return -ENODEV; |
1da177e4 LT |
618 | } |
619 | ||
620 | np->dev = ndev; | |
115c1d6e JM |
621 | if (!ndev->npinfo) { |
622 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
623 | if (!npinfo) { |
624 | err = -ENOMEM; | |
115c1d6e | 625 | goto release; |
b41848b6 | 626 | } |
115c1d6e | 627 | |
11513128 | 628 | npinfo->rx_flags = 0; |
fbeec2e1 | 629 | npinfo->rx_np = NULL; |
a9f6a0dd | 630 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 631 | npinfo->poll_owner = -1; |
2bdfe0ba | 632 | |
a9f6a0dd | 633 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 634 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 635 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 636 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 637 | |
93ec2c72 SH |
638 | atomic_set(&npinfo->refcnt, 1); |
639 | } else { | |
115c1d6e | 640 | npinfo = ndev->npinfo; |
93ec2c72 SH |
641 | atomic_inc(&npinfo->refcnt); |
642 | } | |
1da177e4 LT |
643 | |
644 | if (!ndev->poll_controller) { | |
645 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
646 | np->name, np->dev_name); | |
b41848b6 | 647 | err = -ENOTSUPP; |
1da177e4 LT |
648 | goto release; |
649 | } | |
650 | ||
651 | if (!netif_running(ndev)) { | |
652 | unsigned long atmost, atleast; | |
653 | ||
654 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
655 | np->name, np->dev_name); | |
656 | ||
6756ae4b | 657 | rtnl_lock(); |
b41848b6 SH |
658 | err = dev_open(ndev); |
659 | rtnl_unlock(); | |
660 | ||
661 | if (err) { | |
1da177e4 | 662 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 663 | np->name, ndev->name); |
1da177e4 LT |
664 | goto release; |
665 | } | |
1da177e4 LT |
666 | |
667 | atleast = jiffies + HZ/10; | |
668 | atmost = jiffies + 4*HZ; | |
669 | while (!netif_carrier_ok(ndev)) { | |
670 | if (time_after(jiffies, atmost)) { | |
671 | printk(KERN_NOTICE | |
672 | "%s: timeout waiting for carrier\n", | |
673 | np->name); | |
674 | break; | |
675 | } | |
676 | cond_resched(); | |
677 | } | |
678 | ||
679 | /* If carrier appears to come up instantly, we don't | |
680 | * trust it and pause so that we don't pump all our | |
681 | * queued console messages into the bitbucket. | |
682 | */ | |
683 | ||
684 | if (time_before(jiffies, atleast)) { | |
685 | printk(KERN_NOTICE "%s: carrier detect appears" | |
686 | " untrustworthy, waiting 4 seconds\n", | |
687 | np->name); | |
688 | msleep(4000); | |
689 | } | |
690 | } | |
691 | ||
3860288e | 692 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
693 | memcpy(np->local_mac, ndev->dev_addr, 6); |
694 | ||
695 | if (!np->local_ip) { | |
696 | rcu_read_lock(); | |
e5ed6399 | 697 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
698 | |
699 | if (!in_dev || !in_dev->ifa_list) { | |
700 | rcu_read_unlock(); | |
701 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
702 | np->name, np->dev_name); | |
b41848b6 | 703 | err = -EDESTADDRREQ; |
1da177e4 LT |
704 | goto release; |
705 | } | |
706 | ||
707 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
708 | rcu_read_unlock(); | |
709 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
710 | np->name, HIPQUAD(np->local_ip)); | |
711 | } | |
712 | ||
fbeec2e1 JM |
713 | if (np->rx_hook) { |
714 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
715 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
716 | npinfo->rx_np = np; | |
717 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
718 | } | |
26520765 IM |
719 | |
720 | /* fill up the skb queue */ | |
721 | refill_skbs(); | |
722 | ||
fbeec2e1 | 723 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 724 | ndev->npinfo = npinfo; |
1da177e4 | 725 | |
53fb95d3 MM |
726 | /* avoid racing with NAPI reading npinfo */ |
727 | synchronize_rcu(); | |
728 | ||
1da177e4 LT |
729 | return 0; |
730 | ||
731 | release: | |
115c1d6e JM |
732 | if (!ndev->npinfo) |
733 | kfree(npinfo); | |
1da177e4 LT |
734 | np->dev = NULL; |
735 | dev_put(ndev); | |
b41848b6 | 736 | return err; |
1da177e4 LT |
737 | } |
738 | ||
c68b9070 DM |
739 | static int __init netpoll_init(void) |
740 | { | |
a1bcfacd SH |
741 | skb_queue_head_init(&skb_pool); |
742 | return 0; | |
743 | } | |
744 | core_initcall(netpoll_init); | |
745 | ||
1da177e4 LT |
746 | void netpoll_cleanup(struct netpoll *np) |
747 | { | |
fbeec2e1 JM |
748 | struct netpoll_info *npinfo; |
749 | unsigned long flags; | |
750 | ||
115c1d6e | 751 | if (np->dev) { |
fbeec2e1 | 752 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
753 | if (npinfo) { |
754 | if (npinfo->rx_np == np) { | |
755 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
756 | npinfo->rx_np = NULL; | |
757 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
758 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
759 | } | |
760 | ||
761 | np->dev->npinfo = NULL; | |
762 | if (atomic_dec_and_test(&npinfo->refcnt)) { | |
763 | skb_queue_purge(&npinfo->arp_tx); | |
b6cd27ed | 764 | skb_queue_purge(&npinfo->txq); |
6c43ff18 | 765 | cancel_rearming_delayed_work(&npinfo->tx_work); |
b6cd27ed | 766 | flush_scheduled_work(); |
93ec2c72 SH |
767 | |
768 | kfree(npinfo); | |
769 | } | |
fbeec2e1 | 770 | } |
93ec2c72 | 771 | |
115c1d6e JM |
772 | dev_put(np->dev); |
773 | } | |
fbeec2e1 | 774 | |
1da177e4 LT |
775 | np->dev = NULL; |
776 | } | |
777 | ||
778 | int netpoll_trap(void) | |
779 | { | |
780 | return atomic_read(&trapped); | |
781 | } | |
782 | ||
783 | void netpoll_set_trap(int trap) | |
784 | { | |
785 | if (trap) | |
786 | atomic_inc(&trapped); | |
787 | else | |
788 | atomic_dec(&trapped); | |
789 | } | |
790 | ||
791 | EXPORT_SYMBOL(netpoll_set_trap); | |
792 | EXPORT_SYMBOL(netpoll_trap); | |
793 | EXPORT_SYMBOL(netpoll_parse_options); | |
794 | EXPORT_SYMBOL(netpoll_setup); | |
795 | EXPORT_SYMBOL(netpoll_cleanup); | |
796 | EXPORT_SYMBOL(netpoll_send_udp); | |
797 | EXPORT_SYMBOL(netpoll_poll); |