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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 | ||
1da177e4 LT |
12 | #include <linux/netdevice.h> |
13 | #include <linux/etherdevice.h> | |
14 | #include <linux/string.h> | |
14c85021 | 15 | #include <linux/if_arp.h> |
1da177e4 LT |
16 | #include <linux/inetdevice.h> |
17 | #include <linux/inet.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/netpoll.h> | |
20 | #include <linux/sched.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/rcupdate.h> | |
23 | #include <linux/workqueue.h> | |
24 | #include <net/tcp.h> | |
25 | #include <net/udp.h> | |
26 | #include <asm/unaligned.h> | |
27 | ||
28 | /* | |
29 | * We maintain a small pool of fully-sized skbs, to make sure the | |
30 | * message gets out even in extreme OOM situations. | |
31 | */ | |
32 | ||
33 | #define MAX_UDP_CHUNK 1460 | |
34 | #define MAX_SKBS 32 | |
35 | #define MAX_QUEUE_DEPTH (MAX_SKBS / 2) | |
36 | ||
a1bcfacd | 37 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
38 | |
39 | static atomic_t trapped; | |
40 | ||
2bdfe0ba | 41 | #define USEC_PER_POLL 50 |
1da177e4 LT |
42 | #define NETPOLL_RX_ENABLED 1 |
43 | #define NETPOLL_RX_DROP 2 | |
44 | ||
45 | #define MAX_SKB_SIZE \ | |
46 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
47 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
48 | ||
49 | static void zap_completion_queue(void); | |
068c6e98 | 50 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 51 | |
c4028958 | 52 | static void queue_process(struct work_struct *work) |
1da177e4 | 53 | { |
4c1ac1b4 DH |
54 | struct netpoll_info *npinfo = |
55 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 56 | struct sk_buff *skb; |
3640543d | 57 | unsigned long flags; |
1da177e4 | 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 | |
3640543d IM |
67 | local_irq_save(flags); |
68 | netif_tx_lock(dev); | |
6c43ff18 SH |
69 | if (netif_queue_stopped(dev) || |
70 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { | |
71 | skb_queue_head(&npinfo->txq, skb); | |
3640543d IM |
72 | netif_tx_unlock(dev); |
73 | local_irq_restore(flags); | |
1da177e4 | 74 | |
6c43ff18 SH |
75 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
76 | return; | |
77 | } | |
3640543d IM |
78 | netif_tx_unlock(dev); |
79 | local_irq_restore(flags); | |
1da177e4 | 80 | } |
1da177e4 LT |
81 | } |
82 | ||
b51655b9 AV |
83 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
84 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 85 | { |
d6f5493c | 86 | __wsum psum; |
fb286bb2 | 87 | |
60476372 | 88 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
89 | return 0; |
90 | ||
fb286bb2 HX |
91 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
92 | ||
84fa7933 | 93 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 94 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 95 | return 0; |
1da177e4 | 96 | |
fb286bb2 | 97 | skb->csum = psum; |
1da177e4 | 98 | |
fb286bb2 | 99 | return __skb_checksum_complete(skb); |
1da177e4 LT |
100 | } |
101 | ||
102 | /* | |
103 | * Check whether delayed processing was scheduled for our NIC. If so, | |
104 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
105 | * If this fails, either we've recursed in ->poll() or it's already | |
106 | * running on another CPU. | |
107 | * | |
108 | * Note: we don't mask interrupts with this lock because we're using | |
109 | * trylock here and interrupts are already disabled in the softirq | |
110 | * case. Further, we test the poll_owner to avoid recursion on UP | |
111 | * systems where the lock doesn't exist. | |
112 | * | |
113 | * In cases where there is bi-directional communications, reading only | |
114 | * one message at a time can lead to packets being dropped by the | |
115 | * network adapter, forcing superfluous retries and possibly timeouts. | |
116 | * Thus, we set our budget to greater than 1. | |
117 | */ | |
118 | static void poll_napi(struct netpoll *np) | |
119 | { | |
115c1d6e | 120 | struct netpoll_info *npinfo = np->dev->npinfo; |
1da177e4 LT |
121 | int budget = 16; |
122 | ||
123 | if (test_bit(__LINK_STATE_RX_SCHED, &np->dev->state) && | |
115c1d6e JM |
124 | npinfo->poll_owner != smp_processor_id() && |
125 | spin_trylock(&npinfo->poll_lock)) { | |
126 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
1da177e4 LT |
127 | atomic_inc(&trapped); |
128 | ||
129 | np->dev->poll(np->dev, &budget); | |
130 | ||
131 | atomic_dec(&trapped); | |
115c1d6e JM |
132 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
133 | spin_unlock(&npinfo->poll_lock); | |
1da177e4 LT |
134 | } |
135 | } | |
136 | ||
068c6e98 NH |
137 | static void service_arp_queue(struct netpoll_info *npi) |
138 | { | |
139 | struct sk_buff *skb; | |
140 | ||
141 | if (unlikely(!npi)) | |
142 | return; | |
143 | ||
144 | skb = skb_dequeue(&npi->arp_tx); | |
145 | ||
146 | while (skb != NULL) { | |
147 | arp_reply(skb); | |
148 | skb = skb_dequeue(&npi->arp_tx); | |
149 | } | |
068c6e98 NH |
150 | } |
151 | ||
1da177e4 LT |
152 | void netpoll_poll(struct netpoll *np) |
153 | { | |
c68b9070 | 154 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
1da177e4 LT |
155 | return; |
156 | ||
157 | /* Process pending work on NIC */ | |
158 | np->dev->poll_controller(np->dev); | |
159 | if (np->dev->poll) | |
160 | poll_napi(np); | |
161 | ||
068c6e98 NH |
162 | service_arp_queue(np->dev->npinfo); |
163 | ||
1da177e4 LT |
164 | zap_completion_queue(); |
165 | } | |
166 | ||
167 | static void refill_skbs(void) | |
168 | { | |
169 | struct sk_buff *skb; | |
170 | unsigned long flags; | |
171 | ||
a1bcfacd SH |
172 | spin_lock_irqsave(&skb_pool.lock, flags); |
173 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
174 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
175 | if (!skb) | |
176 | break; | |
177 | ||
a1bcfacd | 178 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 179 | } |
a1bcfacd | 180 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
181 | } |
182 | ||
183 | static void zap_completion_queue(void) | |
184 | { | |
185 | unsigned long flags; | |
186 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
187 | ||
188 | if (sd->completion_queue) { | |
189 | struct sk_buff *clist; | |
190 | ||
191 | local_irq_save(flags); | |
192 | clist = sd->completion_queue; | |
193 | sd->completion_queue = NULL; | |
194 | local_irq_restore(flags); | |
195 | ||
196 | while (clist != NULL) { | |
197 | struct sk_buff *skb = clist; | |
198 | clist = clist->next; | |
c68b9070 | 199 | if (skb->destructor) |
1da177e4 LT |
200 | dev_kfree_skb_any(skb); /* put this one back */ |
201 | else | |
202 | __kfree_skb(skb); | |
203 | } | |
204 | } | |
205 | ||
206 | put_cpu_var(softnet_data); | |
207 | } | |
208 | ||
a1bcfacd | 209 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 210 | { |
a1bcfacd SH |
211 | int count = 0; |
212 | struct sk_buff *skb; | |
1da177e4 LT |
213 | |
214 | zap_completion_queue(); | |
a1bcfacd | 215 | refill_skbs(); |
1da177e4 | 216 | repeat: |
1da177e4 LT |
217 | |
218 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
219 | if (!skb) |
220 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
221 | |
222 | if (!skb) { | |
a1bcfacd SH |
223 | if (++count < 10) { |
224 | netpoll_poll(np); | |
225 | goto repeat; | |
1da177e4 | 226 | } |
a1bcfacd | 227 | return NULL; |
1da177e4 LT |
228 | } |
229 | ||
230 | atomic_set(&skb->users, 1); | |
231 | skb_reserve(skb, reserve); | |
232 | return skb; | |
233 | } | |
234 | ||
235 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) | |
236 | { | |
2bdfe0ba SH |
237 | int status = NETDEV_TX_BUSY; |
238 | unsigned long tries; | |
4ec93edb YH |
239 | struct net_device *dev = np->dev; |
240 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 241 | |
4ec93edb YH |
242 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
243 | __kfree_skb(skb); | |
244 | return; | |
245 | } | |
2bdfe0ba SH |
246 | |
247 | /* don't get messages out of order, and no recursion */ | |
c68b9070 | 248 | if (skb_queue_len(&npinfo->txq) == 0 && |
e37b8d93 | 249 | npinfo->poll_owner != smp_processor_id()) { |
a49f99ff AM |
250 | unsigned long flags; |
251 | ||
252 | local_irq_save(flags); | |
e37b8d93 AM |
253 | if (netif_tx_trylock(dev)) { |
254 | /* try until next clock tick */ | |
255 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
256 | tries > 0; --tries) { | |
257 | if (!netif_queue_stopped(dev)) | |
258 | status = dev->hard_start_xmit(skb, dev); | |
259 | ||
260 | if (status == NETDEV_TX_OK) | |
261 | break; | |
262 | ||
263 | /* tickle device maybe there is some cleanup */ | |
264 | netpoll_poll(np); | |
265 | ||
266 | udelay(USEC_PER_POLL); | |
267 | } | |
268 | netif_tx_unlock(dev); | |
0db1d6fc | 269 | } |
a49f99ff | 270 | local_irq_restore(flags); |
1da177e4 | 271 | } |
1da177e4 | 272 | |
2bdfe0ba | 273 | if (status != NETDEV_TX_OK) { |
5de4a473 | 274 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 275 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 276 | } |
1da177e4 LT |
277 | } |
278 | ||
279 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
280 | { | |
281 | int total_len, eth_len, ip_len, udp_len; | |
282 | struct sk_buff *skb; | |
283 | struct udphdr *udph; | |
284 | struct iphdr *iph; | |
285 | struct ethhdr *eth; | |
286 | ||
287 | udp_len = len + sizeof(*udph); | |
288 | ip_len = eth_len = udp_len + sizeof(*iph); | |
289 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
290 | ||
291 | skb = find_skb(np, total_len, total_len - len); | |
292 | if (!skb) | |
293 | return; | |
294 | ||
27d7ff46 | 295 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
296 | skb->len += len; |
297 | ||
4bedb452 ACM |
298 | skb_push(skb, sizeof(*udph)); |
299 | skb_reset_transport_header(skb); | |
300 | udph = udp_hdr(skb); | |
1da177e4 LT |
301 | udph->source = htons(np->local_port); |
302 | udph->dest = htons(np->remote_port); | |
303 | udph->len = htons(udp_len); | |
304 | udph->check = 0; | |
8e365eec CL |
305 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
306 | htonl(np->remote_ip), | |
307 | udp_len, IPPROTO_UDP, | |
308 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
309 | if (udph->check == 0) | |
5e57dff2 | 310 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 311 | |
e2d1bca7 ACM |
312 | skb_push(skb, sizeof(*iph)); |
313 | skb_reset_network_header(skb); | |
eddc9ec5 | 314 | iph = ip_hdr(skb); |
1da177e4 LT |
315 | |
316 | /* iph->version = 4; iph->ihl = 5; */ | |
317 | put_unaligned(0x45, (unsigned char *)iph); | |
318 | iph->tos = 0; | |
319 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
320 | iph->id = 0; | |
321 | iph->frag_off = 0; | |
322 | iph->ttl = 64; | |
323 | iph->protocol = IPPROTO_UDP; | |
324 | iph->check = 0; | |
325 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
326 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
327 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
328 | ||
329 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 330 | skb_reset_mac_header(skb); |
206daaf7 | 331 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
1da177e4 LT |
332 | memcpy(eth->h_source, np->local_mac, 6); |
333 | memcpy(eth->h_dest, np->remote_mac, 6); | |
334 | ||
335 | skb->dev = np->dev; | |
336 | ||
337 | netpoll_send_skb(np, skb); | |
338 | } | |
339 | ||
340 | static void arp_reply(struct sk_buff *skb) | |
341 | { | |
115c1d6e | 342 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
343 | struct arphdr *arp; |
344 | unsigned char *arp_ptr; | |
345 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 346 | __be32 sip, tip; |
47bbec02 | 347 | unsigned char *sha; |
1da177e4 | 348 | struct sk_buff *send_skb; |
115c1d6e | 349 | struct netpoll *np = NULL; |
1da177e4 | 350 | |
fbeec2e1 JM |
351 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
352 | np = npinfo->rx_np; | |
115c1d6e JM |
353 | if (!np) |
354 | return; | |
1da177e4 LT |
355 | |
356 | /* No arp on this interface */ | |
357 | if (skb->dev->flags & IFF_NOARP) | |
358 | return; | |
359 | ||
360 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
361 | (2 * skb->dev->addr_len) + | |
362 | (2 * sizeof(u32))))) | |
363 | return; | |
364 | ||
c1d2bbe1 | 365 | skb_reset_network_header(skb); |
badff6d0 | 366 | skb_reset_transport_header(skb); |
d0a92be0 | 367 | arp = arp_hdr(skb); |
1da177e4 LT |
368 | |
369 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
370 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
371 | arp->ar_pro != htons(ETH_P_IP) || | |
372 | arp->ar_op != htons(ARPOP_REQUEST)) | |
373 | return; | |
374 | ||
47bbec02 NH |
375 | arp_ptr = (unsigned char *)(arp+1); |
376 | /* save the location of the src hw addr */ | |
377 | sha = arp_ptr; | |
378 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 379 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
380 | arp_ptr += 4; |
381 | /* if we actually cared about dst hw addr, it would get copied here */ | |
382 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
383 | memcpy(&tip, arp_ptr, 4); |
384 | ||
385 | /* Should we ignore arp? */ | |
386 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
387 | return; | |
388 | ||
389 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
390 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
391 | LL_RESERVED_SPACE(np->dev)); | |
392 | ||
393 | if (!send_skb) | |
394 | return; | |
395 | ||
c1d2bbe1 | 396 | skb_reset_network_header(send_skb); |
1da177e4 LT |
397 | arp = (struct arphdr *) skb_put(send_skb, size); |
398 | send_skb->dev = skb->dev; | |
399 | send_skb->protocol = htons(ETH_P_ARP); | |
400 | ||
401 | /* Fill the device header for the ARP frame */ | |
402 | ||
403 | if (np->dev->hard_header && | |
404 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
47bbec02 | 405 | sha, np->local_mac, |
c68b9070 | 406 | send_skb->len) < 0) { |
1da177e4 LT |
407 | kfree_skb(send_skb); |
408 | return; | |
409 | } | |
410 | ||
411 | /* | |
412 | * Fill out the arp protocol part. | |
413 | * | |
414 | * we only support ethernet device type, | |
415 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
416 | */ | |
417 | ||
418 | arp->ar_hrd = htons(np->dev->type); | |
419 | arp->ar_pro = htons(ETH_P_IP); | |
420 | arp->ar_hln = np->dev->addr_len; | |
421 | arp->ar_pln = 4; | |
422 | arp->ar_op = htons(type); | |
423 | ||
424 | arp_ptr=(unsigned char *)(arp + 1); | |
425 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
426 | arp_ptr += np->dev->addr_len; | |
427 | memcpy(arp_ptr, &tip, 4); | |
428 | arp_ptr += 4; | |
47bbec02 | 429 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
430 | arp_ptr += np->dev->addr_len; |
431 | memcpy(arp_ptr, &sip, 4); | |
432 | ||
433 | netpoll_send_skb(np, send_skb); | |
434 | } | |
435 | ||
436 | int __netpoll_rx(struct sk_buff *skb) | |
437 | { | |
438 | int proto, len, ulen; | |
439 | struct iphdr *iph; | |
440 | struct udphdr *uh; | |
068c6e98 NH |
441 | struct netpoll_info *npi = skb->dev->npinfo; |
442 | struct netpoll *np = npi->rx_np; | |
443 | ||
fbeec2e1 | 444 | if (!np) |
1da177e4 LT |
445 | goto out; |
446 | if (skb->dev->type != ARPHRD_ETHER) | |
447 | goto out; | |
448 | ||
449 | /* check if netpoll clients need ARP */ | |
724800d6 | 450 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 451 | atomic_read(&trapped)) { |
068c6e98 | 452 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
453 | return 1; |
454 | } | |
455 | ||
456 | proto = ntohs(eth_hdr(skb)->h_proto); | |
457 | if (proto != ETH_P_IP) | |
458 | goto out; | |
459 | if (skb->pkt_type == PACKET_OTHERHOST) | |
460 | goto out; | |
461 | if (skb_shared(skb)) | |
462 | goto out; | |
463 | ||
464 | iph = (struct iphdr *)skb->data; | |
465 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
466 | goto out; | |
467 | if (iph->ihl < 5 || iph->version != 4) | |
468 | goto out; | |
469 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
470 | goto out; | |
471 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
472 | goto out; | |
473 | ||
474 | len = ntohs(iph->tot_len); | |
475 | if (skb->len < len || len < iph->ihl*4) | |
476 | goto out; | |
477 | ||
5e7d7fa5 AL |
478 | /* |
479 | * Our transport medium may have padded the buffer out. | |
480 | * Now We trim to the true length of the frame. | |
481 | */ | |
482 | if (pskb_trim_rcsum(skb, len)) | |
483 | goto out; | |
484 | ||
1da177e4 LT |
485 | if (iph->protocol != IPPROTO_UDP) |
486 | goto out; | |
487 | ||
488 | len -= iph->ihl*4; | |
489 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
490 | ulen = ntohs(uh->len); | |
491 | ||
492 | if (ulen != len) | |
493 | goto out; | |
fb286bb2 | 494 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
495 | goto out; |
496 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
497 | goto out; | |
498 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
499 | goto out; | |
500 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
501 | goto out; | |
502 | ||
503 | np->rx_hook(np, ntohs(uh->source), | |
504 | (char *)(uh+1), | |
505 | ulen - sizeof(struct udphdr)); | |
506 | ||
507 | kfree_skb(skb); | |
508 | return 1; | |
509 | ||
510 | out: | |
511 | if (atomic_read(&trapped)) { | |
512 | kfree_skb(skb); | |
513 | return 1; | |
514 | } | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | int netpoll_parse_options(struct netpoll *np, char *opt) | |
520 | { | |
521 | char *cur=opt, *delim; | |
522 | ||
c68b9070 | 523 | if (*cur != '@') { |
1da177e4 LT |
524 | if ((delim = strchr(cur, '@')) == NULL) |
525 | goto parse_failed; | |
c68b9070 DM |
526 | *delim = 0; |
527 | np->local_port = simple_strtol(cur, NULL, 10); | |
528 | cur = delim; | |
1da177e4 LT |
529 | } |
530 | cur++; | |
531 | printk(KERN_INFO "%s: local port %d\n", np->name, np->local_port); | |
532 | ||
c68b9070 | 533 | if (*cur != '/') { |
1da177e4 LT |
534 | if ((delim = strchr(cur, '/')) == NULL) |
535 | goto parse_failed; | |
c68b9070 DM |
536 | *delim = 0; |
537 | np->local_ip = ntohl(in_aton(cur)); | |
538 | cur = delim; | |
1da177e4 LT |
539 | |
540 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
541 | np->name, HIPQUAD(np->local_ip)); | |
542 | } | |
543 | cur++; | |
544 | ||
c68b9070 | 545 | if (*cur != ',') { |
1da177e4 LT |
546 | /* parse out dev name */ |
547 | if ((delim = strchr(cur, ',')) == NULL) | |
548 | goto parse_failed; | |
c68b9070 | 549 | *delim = 0; |
1da177e4 | 550 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 551 | cur = delim; |
1da177e4 LT |
552 | } |
553 | cur++; | |
554 | ||
555 | printk(KERN_INFO "%s: interface %s\n", np->name, np->dev_name); | |
556 | ||
c68b9070 | 557 | if (*cur != '@') { |
1da177e4 LT |
558 | /* dst port */ |
559 | if ((delim = strchr(cur, '@')) == NULL) | |
560 | goto parse_failed; | |
c68b9070 DM |
561 | *delim = 0; |
562 | np->remote_port = simple_strtol(cur, NULL, 10); | |
563 | cur = delim; | |
1da177e4 LT |
564 | } |
565 | cur++; | |
566 | printk(KERN_INFO "%s: remote port %d\n", np->name, np->remote_port); | |
567 | ||
568 | /* dst ip */ | |
569 | if ((delim = strchr(cur, '/')) == NULL) | |
570 | goto parse_failed; | |
c68b9070 DM |
571 | *delim = 0; |
572 | np->remote_ip = ntohl(in_aton(cur)); | |
573 | cur = delim + 1; | |
1da177e4 LT |
574 | |
575 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
c68b9070 | 576 | np->name, HIPQUAD(np->remote_ip)); |
1da177e4 | 577 | |
c68b9070 | 578 | if (*cur != 0) { |
1da177e4 LT |
579 | /* MAC address */ |
580 | if ((delim = strchr(cur, ':')) == NULL) | |
581 | goto parse_failed; | |
c68b9070 DM |
582 | *delim = 0; |
583 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
584 | cur = delim + 1; | |
1da177e4 LT |
585 | if ((delim = strchr(cur, ':')) == NULL) |
586 | goto parse_failed; | |
c68b9070 DM |
587 | *delim = 0; |
588 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
589 | cur = delim + 1; | |
1da177e4 LT |
590 | if ((delim = strchr(cur, ':')) == NULL) |
591 | goto parse_failed; | |
c68b9070 DM |
592 | *delim = 0; |
593 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
594 | cur = delim + 1; | |
1da177e4 LT |
595 | if ((delim = strchr(cur, ':')) == NULL) |
596 | goto parse_failed; | |
c68b9070 DM |
597 | *delim = 0; |
598 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
599 | cur = delim + 1; | |
1da177e4 LT |
600 | if ((delim = strchr(cur, ':')) == NULL) |
601 | goto parse_failed; | |
c68b9070 DM |
602 | *delim = 0; |
603 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
604 | cur = delim + 1; | |
605 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
606 | } |
607 | ||
608 | printk(KERN_INFO "%s: remote ethernet address " | |
609 | "%02x:%02x:%02x:%02x:%02x:%02x\n", | |
610 | np->name, | |
611 | np->remote_mac[0], | |
612 | np->remote_mac[1], | |
613 | np->remote_mac[2], | |
614 | np->remote_mac[3], | |
615 | np->remote_mac[4], | |
616 | np->remote_mac[5]); | |
617 | ||
618 | return 0; | |
619 | ||
620 | parse_failed: | |
621 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
622 | np->name, cur); | |
623 | return -1; | |
624 | } | |
625 | ||
626 | int netpoll_setup(struct netpoll *np) | |
627 | { | |
628 | struct net_device *ndev = NULL; | |
629 | struct in_device *in_dev; | |
115c1d6e | 630 | struct netpoll_info *npinfo; |
fbeec2e1 | 631 | unsigned long flags; |
b41848b6 | 632 | int err; |
1da177e4 LT |
633 | |
634 | if (np->dev_name) | |
635 | ndev = dev_get_by_name(np->dev_name); | |
636 | if (!ndev) { | |
637 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
638 | np->name, np->dev_name); | |
b41848b6 | 639 | return -ENODEV; |
1da177e4 LT |
640 | } |
641 | ||
642 | np->dev = ndev; | |
115c1d6e JM |
643 | if (!ndev->npinfo) { |
644 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
645 | if (!npinfo) { |
646 | err = -ENOMEM; | |
115c1d6e | 647 | goto release; |
b41848b6 | 648 | } |
115c1d6e | 649 | |
11513128 | 650 | npinfo->rx_flags = 0; |
fbeec2e1 | 651 | npinfo->rx_np = NULL; |
a9f6a0dd | 652 | spin_lock_init(&npinfo->poll_lock); |
115c1d6e | 653 | npinfo->poll_owner = -1; |
2bdfe0ba | 654 | |
a9f6a0dd | 655 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 656 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 657 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 658 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 659 | |
93ec2c72 SH |
660 | atomic_set(&npinfo->refcnt, 1); |
661 | } else { | |
115c1d6e | 662 | npinfo = ndev->npinfo; |
93ec2c72 SH |
663 | atomic_inc(&npinfo->refcnt); |
664 | } | |
1da177e4 LT |
665 | |
666 | if (!ndev->poll_controller) { | |
667 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
668 | np->name, np->dev_name); | |
b41848b6 | 669 | err = -ENOTSUPP; |
1da177e4 LT |
670 | goto release; |
671 | } | |
672 | ||
673 | if (!netif_running(ndev)) { | |
674 | unsigned long atmost, atleast; | |
675 | ||
676 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
677 | np->name, np->dev_name); | |
678 | ||
6756ae4b | 679 | rtnl_lock(); |
b41848b6 SH |
680 | err = dev_open(ndev); |
681 | rtnl_unlock(); | |
682 | ||
683 | if (err) { | |
1da177e4 | 684 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 685 | np->name, ndev->name); |
1da177e4 LT |
686 | goto release; |
687 | } | |
1da177e4 LT |
688 | |
689 | atleast = jiffies + HZ/10; | |
4ec93edb | 690 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
691 | while (!netif_carrier_ok(ndev)) { |
692 | if (time_after(jiffies, atmost)) { | |
693 | printk(KERN_NOTICE | |
694 | "%s: timeout waiting for carrier\n", | |
695 | np->name); | |
696 | break; | |
697 | } | |
698 | cond_resched(); | |
699 | } | |
700 | ||
701 | /* If carrier appears to come up instantly, we don't | |
702 | * trust it and pause so that we don't pump all our | |
703 | * queued console messages into the bitbucket. | |
704 | */ | |
705 | ||
706 | if (time_before(jiffies, atleast)) { | |
707 | printk(KERN_NOTICE "%s: carrier detect appears" | |
708 | " untrustworthy, waiting 4 seconds\n", | |
709 | np->name); | |
710 | msleep(4000); | |
711 | } | |
712 | } | |
713 | ||
3860288e | 714 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
715 | memcpy(np->local_mac, ndev->dev_addr, 6); |
716 | ||
717 | if (!np->local_ip) { | |
718 | rcu_read_lock(); | |
e5ed6399 | 719 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
720 | |
721 | if (!in_dev || !in_dev->ifa_list) { | |
722 | rcu_read_unlock(); | |
723 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
724 | np->name, np->dev_name); | |
b41848b6 | 725 | err = -EDESTADDRREQ; |
1da177e4 LT |
726 | goto release; |
727 | } | |
728 | ||
729 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
730 | rcu_read_unlock(); | |
731 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
732 | np->name, HIPQUAD(np->local_ip)); | |
733 | } | |
734 | ||
fbeec2e1 JM |
735 | if (np->rx_hook) { |
736 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
737 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
738 | npinfo->rx_np = np; | |
739 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
740 | } | |
26520765 IM |
741 | |
742 | /* fill up the skb queue */ | |
743 | refill_skbs(); | |
744 | ||
fbeec2e1 | 745 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 746 | ndev->npinfo = npinfo; |
1da177e4 | 747 | |
53fb95d3 MM |
748 | /* avoid racing with NAPI reading npinfo */ |
749 | synchronize_rcu(); | |
750 | ||
1da177e4 LT |
751 | return 0; |
752 | ||
753 | release: | |
115c1d6e JM |
754 | if (!ndev->npinfo) |
755 | kfree(npinfo); | |
1da177e4 LT |
756 | np->dev = NULL; |
757 | dev_put(ndev); | |
b41848b6 | 758 | return err; |
1da177e4 LT |
759 | } |
760 | ||
c68b9070 DM |
761 | static int __init netpoll_init(void) |
762 | { | |
a1bcfacd SH |
763 | skb_queue_head_init(&skb_pool); |
764 | return 0; | |
765 | } | |
766 | core_initcall(netpoll_init); | |
767 | ||
1da177e4 LT |
768 | void netpoll_cleanup(struct netpoll *np) |
769 | { | |
fbeec2e1 JM |
770 | struct netpoll_info *npinfo; |
771 | unsigned long flags; | |
772 | ||
115c1d6e | 773 | if (np->dev) { |
fbeec2e1 | 774 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
775 | if (npinfo) { |
776 | if (npinfo->rx_np == np) { | |
777 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
778 | npinfo->rx_np = NULL; | |
779 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
780 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
781 | } | |
782 | ||
783 | np->dev->npinfo = NULL; | |
784 | if (atomic_dec_and_test(&npinfo->refcnt)) { | |
785 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 786 | skb_queue_purge(&npinfo->txq); |
6c43ff18 | 787 | cancel_rearming_delayed_work(&npinfo->tx_work); |
4ec93edb | 788 | flush_scheduled_work(); |
93ec2c72 SH |
789 | |
790 | kfree(npinfo); | |
791 | } | |
fbeec2e1 | 792 | } |
93ec2c72 | 793 | |
115c1d6e JM |
794 | dev_put(np->dev); |
795 | } | |
fbeec2e1 | 796 | |
1da177e4 LT |
797 | np->dev = NULL; |
798 | } | |
799 | ||
800 | int netpoll_trap(void) | |
801 | { | |
802 | return atomic_read(&trapped); | |
803 | } | |
804 | ||
805 | void netpoll_set_trap(int trap) | |
806 | { | |
807 | if (trap) | |
808 | atomic_inc(&trapped); | |
809 | else | |
810 | atomic_dec(&trapped); | |
811 | } | |
812 | ||
813 | EXPORT_SYMBOL(netpoll_set_trap); | |
814 | EXPORT_SYMBOL(netpoll_trap); | |
815 | EXPORT_SYMBOL(netpoll_parse_options); | |
816 | EXPORT_SYMBOL(netpoll_setup); | |
817 | EXPORT_SYMBOL(netpoll_cleanup); | |
818 | EXPORT_SYMBOL(netpoll_send_udp); | |
819 | EXPORT_SYMBOL(netpoll_poll); |