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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); | |
f25f4e44 PWJ |
69 | if ((netif_queue_stopped(dev) || |
70 | netif_subqueue_stopped(dev, skb->queue_mapping)) || | |
71 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { | |
6c43ff18 | 72 | skb_queue_head(&npinfo->txq, skb); |
3640543d IM |
73 | netif_tx_unlock(dev); |
74 | local_irq_restore(flags); | |
1da177e4 | 75 | |
25442caf | 76 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
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 | 88 | |
60476372 | 89 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
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; |
bea3348e | 122 | struct napi_struct *napi; |
1da177e4 LT |
123 | int budget = 16; |
124 | ||
bea3348e SH |
125 | list_for_each_entry(napi, &np->dev->napi_list, dev_list) { |
126 | if (test_bit(NAPI_STATE_SCHED, &napi->state) && | |
127 | napi->poll_owner != smp_processor_id() && | |
128 | spin_trylock(&napi->poll_lock)) { | |
129 | npinfo->rx_flags |= NETPOLL_RX_DROP; | |
130 | atomic_inc(&trapped); | |
1da177e4 | 131 | |
bea3348e | 132 | napi->poll(napi, budget); |
1da177e4 | 133 | |
bea3348e SH |
134 | atomic_dec(&trapped); |
135 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; | |
136 | spin_unlock(&napi->poll_lock); | |
137 | } | |
1da177e4 LT |
138 | } |
139 | } | |
140 | ||
068c6e98 NH |
141 | static void service_arp_queue(struct netpoll_info *npi) |
142 | { | |
143 | struct sk_buff *skb; | |
144 | ||
145 | if (unlikely(!npi)) | |
146 | return; | |
147 | ||
148 | skb = skb_dequeue(&npi->arp_tx); | |
149 | ||
150 | while (skb != NULL) { | |
151 | arp_reply(skb); | |
152 | skb = skb_dequeue(&npi->arp_tx); | |
153 | } | |
068c6e98 NH |
154 | } |
155 | ||
1da177e4 LT |
156 | void netpoll_poll(struct netpoll *np) |
157 | { | |
c68b9070 | 158 | if (!np->dev || !netif_running(np->dev) || !np->dev->poll_controller) |
1da177e4 LT |
159 | return; |
160 | ||
161 | /* Process pending work on NIC */ | |
162 | np->dev->poll_controller(np->dev); | |
bea3348e | 163 | if (!list_empty(&np->dev->napi_list)) |
1da177e4 LT |
164 | poll_napi(np); |
165 | ||
068c6e98 NH |
166 | service_arp_queue(np->dev->npinfo); |
167 | ||
1da177e4 LT |
168 | zap_completion_queue(); |
169 | } | |
170 | ||
171 | static void refill_skbs(void) | |
172 | { | |
173 | struct sk_buff *skb; | |
174 | unsigned long flags; | |
175 | ||
a1bcfacd SH |
176 | spin_lock_irqsave(&skb_pool.lock, flags); |
177 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
178 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
179 | if (!skb) | |
180 | break; | |
181 | ||
a1bcfacd | 182 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 183 | } |
a1bcfacd | 184 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
185 | } |
186 | ||
187 | static void zap_completion_queue(void) | |
188 | { | |
189 | unsigned long flags; | |
190 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
191 | ||
192 | if (sd->completion_queue) { | |
193 | struct sk_buff *clist; | |
194 | ||
195 | local_irq_save(flags); | |
196 | clist = sd->completion_queue; | |
197 | sd->completion_queue = NULL; | |
198 | local_irq_restore(flags); | |
199 | ||
200 | while (clist != NULL) { | |
201 | struct sk_buff *skb = clist; | |
202 | clist = clist->next; | |
c68b9070 | 203 | if (skb->destructor) |
1da177e4 LT |
204 | dev_kfree_skb_any(skb); /* put this one back */ |
205 | else | |
206 | __kfree_skb(skb); | |
207 | } | |
208 | } | |
209 | ||
210 | put_cpu_var(softnet_data); | |
211 | } | |
212 | ||
a1bcfacd | 213 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 214 | { |
a1bcfacd SH |
215 | int count = 0; |
216 | struct sk_buff *skb; | |
1da177e4 LT |
217 | |
218 | zap_completion_queue(); | |
a1bcfacd | 219 | refill_skbs(); |
1da177e4 | 220 | repeat: |
1da177e4 LT |
221 | |
222 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
223 | if (!skb) |
224 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
225 | |
226 | if (!skb) { | |
a1bcfacd SH |
227 | if (++count < 10) { |
228 | netpoll_poll(np); | |
229 | goto repeat; | |
1da177e4 | 230 | } |
a1bcfacd | 231 | return NULL; |
1da177e4 LT |
232 | } |
233 | ||
234 | atomic_set(&skb->users, 1); | |
235 | skb_reserve(skb, reserve); | |
236 | return skb; | |
237 | } | |
238 | ||
bea3348e SH |
239 | static int netpoll_owner_active(struct net_device *dev) |
240 | { | |
241 | struct napi_struct *napi; | |
242 | ||
243 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
244 | if (napi->poll_owner == smp_processor_id()) | |
245 | return 1; | |
246 | } | |
247 | return 0; | |
248 | } | |
249 | ||
1da177e4 LT |
250 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
251 | { | |
2bdfe0ba SH |
252 | int status = NETDEV_TX_BUSY; |
253 | unsigned long tries; | |
4ec93edb YH |
254 | struct net_device *dev = np->dev; |
255 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 256 | |
4ec93edb YH |
257 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
258 | __kfree_skb(skb); | |
259 | return; | |
260 | } | |
2bdfe0ba SH |
261 | |
262 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 263 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
a49f99ff AM |
264 | unsigned long flags; |
265 | ||
266 | local_irq_save(flags); | |
0db3dc73 SH |
267 | /* try until next clock tick */ |
268 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
269 | tries > 0; --tries) { | |
270 | if (netif_tx_trylock(dev)) { | |
f25f4e44 PWJ |
271 | if (!netif_queue_stopped(dev) && |
272 | !netif_subqueue_stopped(dev, skb->queue_mapping)) | |
e37b8d93 | 273 | status = dev->hard_start_xmit(skb, dev); |
0db3dc73 | 274 | netif_tx_unlock(dev); |
e37b8d93 AM |
275 | |
276 | if (status == NETDEV_TX_OK) | |
277 | break; | |
278 | ||
e37b8d93 | 279 | } |
0db3dc73 SH |
280 | |
281 | /* tickle device maybe there is some cleanup */ | |
282 | netpoll_poll(np); | |
283 | ||
284 | udelay(USEC_PER_POLL); | |
0db1d6fc | 285 | } |
a49f99ff | 286 | local_irq_restore(flags); |
1da177e4 | 287 | } |
1da177e4 | 288 | |
2bdfe0ba | 289 | if (status != NETDEV_TX_OK) { |
5de4a473 | 290 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 291 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 292 | } |
1da177e4 LT |
293 | } |
294 | ||
295 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
296 | { | |
297 | int total_len, eth_len, ip_len, udp_len; | |
298 | struct sk_buff *skb; | |
299 | struct udphdr *udph; | |
300 | struct iphdr *iph; | |
301 | struct ethhdr *eth; | |
302 | ||
303 | udp_len = len + sizeof(*udph); | |
304 | ip_len = eth_len = udp_len + sizeof(*iph); | |
305 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
306 | ||
307 | skb = find_skb(np, total_len, total_len - len); | |
308 | if (!skb) | |
309 | return; | |
310 | ||
27d7ff46 | 311 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
312 | skb->len += len; |
313 | ||
4bedb452 ACM |
314 | skb_push(skb, sizeof(*udph)); |
315 | skb_reset_transport_header(skb); | |
316 | udph = udp_hdr(skb); | |
1da177e4 LT |
317 | udph->source = htons(np->local_port); |
318 | udph->dest = htons(np->remote_port); | |
319 | udph->len = htons(udp_len); | |
320 | udph->check = 0; | |
8e365eec CL |
321 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
322 | htonl(np->remote_ip), | |
323 | udp_len, IPPROTO_UDP, | |
324 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
325 | if (udph->check == 0) | |
5e57dff2 | 326 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 327 | |
e2d1bca7 ACM |
328 | skb_push(skb, sizeof(*iph)); |
329 | skb_reset_network_header(skb); | |
eddc9ec5 | 330 | iph = ip_hdr(skb); |
1da177e4 LT |
331 | |
332 | /* iph->version = 4; iph->ihl = 5; */ | |
333 | put_unaligned(0x45, (unsigned char *)iph); | |
334 | iph->tos = 0; | |
335 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
336 | iph->id = 0; | |
337 | iph->frag_off = 0; | |
338 | iph->ttl = 64; | |
339 | iph->protocol = IPPROTO_UDP; | |
340 | iph->check = 0; | |
341 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
342 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
343 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
344 | ||
345 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 346 | skb_reset_mac_header(skb); |
206daaf7 | 347 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
1da177e4 LT |
348 | memcpy(eth->h_source, np->local_mac, 6); |
349 | memcpy(eth->h_dest, np->remote_mac, 6); | |
350 | ||
351 | skb->dev = np->dev; | |
352 | ||
353 | netpoll_send_skb(np, skb); | |
354 | } | |
355 | ||
356 | static void arp_reply(struct sk_buff *skb) | |
357 | { | |
115c1d6e | 358 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
359 | struct arphdr *arp; |
360 | unsigned char *arp_ptr; | |
361 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 362 | __be32 sip, tip; |
47bbec02 | 363 | unsigned char *sha; |
1da177e4 | 364 | struct sk_buff *send_skb; |
115c1d6e | 365 | struct netpoll *np = NULL; |
1da177e4 | 366 | |
fbeec2e1 JM |
367 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
368 | np = npinfo->rx_np; | |
115c1d6e JM |
369 | if (!np) |
370 | return; | |
1da177e4 LT |
371 | |
372 | /* No arp on this interface */ | |
373 | if (skb->dev->flags & IFF_NOARP) | |
374 | return; | |
375 | ||
376 | if (!pskb_may_pull(skb, (sizeof(struct arphdr) + | |
377 | (2 * skb->dev->addr_len) + | |
378 | (2 * sizeof(u32))))) | |
379 | return; | |
380 | ||
c1d2bbe1 | 381 | skb_reset_network_header(skb); |
badff6d0 | 382 | skb_reset_transport_header(skb); |
d0a92be0 | 383 | arp = arp_hdr(skb); |
1da177e4 LT |
384 | |
385 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
386 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
387 | arp->ar_pro != htons(ETH_P_IP) || | |
388 | arp->ar_op != htons(ARPOP_REQUEST)) | |
389 | return; | |
390 | ||
47bbec02 NH |
391 | arp_ptr = (unsigned char *)(arp+1); |
392 | /* save the location of the src hw addr */ | |
393 | sha = arp_ptr; | |
394 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 395 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
396 | arp_ptr += 4; |
397 | /* if we actually cared about dst hw addr, it would get copied here */ | |
398 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
399 | memcpy(&tip, arp_ptr, 4); |
400 | ||
401 | /* Should we ignore arp? */ | |
402 | if (tip != htonl(np->local_ip) || LOOPBACK(tip) || MULTICAST(tip)) | |
403 | return; | |
404 | ||
405 | size = sizeof(struct arphdr) + 2 * (skb->dev->addr_len + 4); | |
406 | send_skb = find_skb(np, size + LL_RESERVED_SPACE(np->dev), | |
407 | LL_RESERVED_SPACE(np->dev)); | |
408 | ||
409 | if (!send_skb) | |
410 | return; | |
411 | ||
c1d2bbe1 | 412 | skb_reset_network_header(send_skb); |
1da177e4 LT |
413 | arp = (struct arphdr *) skb_put(send_skb, size); |
414 | send_skb->dev = skb->dev; | |
415 | send_skb->protocol = htons(ETH_P_ARP); | |
416 | ||
417 | /* Fill the device header for the ARP frame */ | |
418 | ||
419 | if (np->dev->hard_header && | |
420 | np->dev->hard_header(send_skb, skb->dev, ptype, | |
47bbec02 | 421 | sha, np->local_mac, |
c68b9070 | 422 | send_skb->len) < 0) { |
1da177e4 LT |
423 | kfree_skb(send_skb); |
424 | return; | |
425 | } | |
426 | ||
427 | /* | |
428 | * Fill out the arp protocol part. | |
429 | * | |
430 | * we only support ethernet device type, | |
431 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
432 | */ | |
433 | ||
434 | arp->ar_hrd = htons(np->dev->type); | |
435 | arp->ar_pro = htons(ETH_P_IP); | |
436 | arp->ar_hln = np->dev->addr_len; | |
437 | arp->ar_pln = 4; | |
438 | arp->ar_op = htons(type); | |
439 | ||
440 | arp_ptr=(unsigned char *)(arp + 1); | |
441 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
442 | arp_ptr += np->dev->addr_len; | |
443 | memcpy(arp_ptr, &tip, 4); | |
444 | arp_ptr += 4; | |
47bbec02 | 445 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
446 | arp_ptr += np->dev->addr_len; |
447 | memcpy(arp_ptr, &sip, 4); | |
448 | ||
449 | netpoll_send_skb(np, send_skb); | |
450 | } | |
451 | ||
452 | int __netpoll_rx(struct sk_buff *skb) | |
453 | { | |
454 | int proto, len, ulen; | |
455 | struct iphdr *iph; | |
456 | struct udphdr *uh; | |
068c6e98 NH |
457 | struct netpoll_info *npi = skb->dev->npinfo; |
458 | struct netpoll *np = npi->rx_np; | |
459 | ||
fbeec2e1 | 460 | if (!np) |
1da177e4 LT |
461 | goto out; |
462 | if (skb->dev->type != ARPHRD_ETHER) | |
463 | goto out; | |
464 | ||
465 | /* check if netpoll clients need ARP */ | |
724800d6 | 466 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 467 | atomic_read(&trapped)) { |
068c6e98 | 468 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
469 | return 1; |
470 | } | |
471 | ||
472 | proto = ntohs(eth_hdr(skb)->h_proto); | |
473 | if (proto != ETH_P_IP) | |
474 | goto out; | |
475 | if (skb->pkt_type == PACKET_OTHERHOST) | |
476 | goto out; | |
477 | if (skb_shared(skb)) | |
478 | goto out; | |
479 | ||
480 | iph = (struct iphdr *)skb->data; | |
481 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
482 | goto out; | |
483 | if (iph->ihl < 5 || iph->version != 4) | |
484 | goto out; | |
485 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
486 | goto out; | |
487 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
488 | goto out; | |
489 | ||
490 | len = ntohs(iph->tot_len); | |
491 | if (skb->len < len || len < iph->ihl*4) | |
492 | goto out; | |
493 | ||
5e7d7fa5 AL |
494 | /* |
495 | * Our transport medium may have padded the buffer out. | |
496 | * Now We trim to the true length of the frame. | |
497 | */ | |
498 | if (pskb_trim_rcsum(skb, len)) | |
499 | goto out; | |
500 | ||
1da177e4 LT |
501 | if (iph->protocol != IPPROTO_UDP) |
502 | goto out; | |
503 | ||
504 | len -= iph->ihl*4; | |
505 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
506 | ulen = ntohs(uh->len); | |
507 | ||
508 | if (ulen != len) | |
509 | goto out; | |
fb286bb2 | 510 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
511 | goto out; |
512 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
513 | goto out; | |
514 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
515 | goto out; | |
516 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
517 | goto out; | |
518 | ||
519 | np->rx_hook(np, ntohs(uh->source), | |
520 | (char *)(uh+1), | |
521 | ulen - sizeof(struct udphdr)); | |
522 | ||
523 | kfree_skb(skb); | |
524 | return 1; | |
525 | ||
526 | out: | |
527 | if (atomic_read(&trapped)) { | |
528 | kfree_skb(skb); | |
529 | return 1; | |
530 | } | |
531 | ||
532 | return 0; | |
533 | } | |
534 | ||
0bcc1816 SS |
535 | void netpoll_print_options(struct netpoll *np) |
536 | { | |
0795af57 | 537 | DECLARE_MAC_BUF(mac); |
0bcc1816 SS |
538 | printk(KERN_INFO "%s: local port %d\n", |
539 | np->name, np->local_port); | |
540 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
541 | np->name, HIPQUAD(np->local_ip)); | |
542 | printk(KERN_INFO "%s: interface %s\n", | |
543 | np->name, np->dev_name); | |
544 | printk(KERN_INFO "%s: remote port %d\n", | |
545 | np->name, np->remote_port); | |
546 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
547 | np->name, HIPQUAD(np->remote_ip)); | |
0795af57 JP |
548 | printk(KERN_INFO "%s: remote ethernet address %s\n", |
549 | np->name, print_mac(mac, np->remote_mac)); | |
0bcc1816 SS |
550 | } |
551 | ||
1da177e4 LT |
552 | int netpoll_parse_options(struct netpoll *np, char *opt) |
553 | { | |
554 | char *cur=opt, *delim; | |
555 | ||
c68b9070 | 556 | if (*cur != '@') { |
1da177e4 LT |
557 | if ((delim = strchr(cur, '@')) == NULL) |
558 | goto parse_failed; | |
c68b9070 DM |
559 | *delim = 0; |
560 | np->local_port = simple_strtol(cur, NULL, 10); | |
561 | cur = delim; | |
1da177e4 LT |
562 | } |
563 | cur++; | |
1da177e4 | 564 | |
c68b9070 | 565 | if (*cur != '/') { |
1da177e4 LT |
566 | if ((delim = strchr(cur, '/')) == NULL) |
567 | goto parse_failed; | |
c68b9070 DM |
568 | *delim = 0; |
569 | np->local_ip = ntohl(in_aton(cur)); | |
570 | cur = delim; | |
1da177e4 LT |
571 | } |
572 | cur++; | |
573 | ||
c68b9070 | 574 | if (*cur != ',') { |
1da177e4 LT |
575 | /* parse out dev name */ |
576 | if ((delim = strchr(cur, ',')) == NULL) | |
577 | goto parse_failed; | |
c68b9070 | 578 | *delim = 0; |
1da177e4 | 579 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 580 | cur = delim; |
1da177e4 LT |
581 | } |
582 | cur++; | |
583 | ||
c68b9070 | 584 | if (*cur != '@') { |
1da177e4 LT |
585 | /* dst port */ |
586 | if ((delim = strchr(cur, '@')) == NULL) | |
587 | goto parse_failed; | |
c68b9070 DM |
588 | *delim = 0; |
589 | np->remote_port = simple_strtol(cur, NULL, 10); | |
590 | cur = delim; | |
1da177e4 LT |
591 | } |
592 | cur++; | |
1da177e4 LT |
593 | |
594 | /* dst ip */ | |
595 | if ((delim = strchr(cur, '/')) == NULL) | |
596 | goto parse_failed; | |
c68b9070 DM |
597 | *delim = 0; |
598 | np->remote_ip = ntohl(in_aton(cur)); | |
599 | cur = delim + 1; | |
1da177e4 | 600 | |
c68b9070 | 601 | if (*cur != 0) { |
1da177e4 LT |
602 | /* MAC address */ |
603 | if ((delim = strchr(cur, ':')) == NULL) | |
604 | goto parse_failed; | |
c68b9070 DM |
605 | *delim = 0; |
606 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
607 | cur = delim + 1; | |
1da177e4 LT |
608 | if ((delim = strchr(cur, ':')) == NULL) |
609 | goto parse_failed; | |
c68b9070 DM |
610 | *delim = 0; |
611 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
612 | cur = delim + 1; | |
1da177e4 LT |
613 | if ((delim = strchr(cur, ':')) == NULL) |
614 | goto parse_failed; | |
c68b9070 DM |
615 | *delim = 0; |
616 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
617 | cur = delim + 1; | |
1da177e4 LT |
618 | if ((delim = strchr(cur, ':')) == NULL) |
619 | goto parse_failed; | |
c68b9070 DM |
620 | *delim = 0; |
621 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
622 | cur = delim + 1; | |
1da177e4 LT |
623 | if ((delim = strchr(cur, ':')) == NULL) |
624 | goto parse_failed; | |
c68b9070 DM |
625 | *delim = 0; |
626 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
627 | cur = delim + 1; | |
628 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
629 | } |
630 | ||
0bcc1816 | 631 | netpoll_print_options(np); |
1da177e4 LT |
632 | |
633 | return 0; | |
634 | ||
635 | parse_failed: | |
636 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
637 | np->name, cur); | |
638 | return -1; | |
639 | } | |
640 | ||
641 | int netpoll_setup(struct netpoll *np) | |
642 | { | |
643 | struct net_device *ndev = NULL; | |
644 | struct in_device *in_dev; | |
115c1d6e | 645 | struct netpoll_info *npinfo; |
fbeec2e1 | 646 | unsigned long flags; |
b41848b6 | 647 | int err; |
1da177e4 LT |
648 | |
649 | if (np->dev_name) | |
881d966b | 650 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
651 | if (!ndev) { |
652 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
653 | np->name, np->dev_name); | |
b41848b6 | 654 | return -ENODEV; |
1da177e4 LT |
655 | } |
656 | ||
657 | np->dev = ndev; | |
115c1d6e JM |
658 | if (!ndev->npinfo) { |
659 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
660 | if (!npinfo) { |
661 | err = -ENOMEM; | |
115c1d6e | 662 | goto release; |
b41848b6 | 663 | } |
115c1d6e | 664 | |
11513128 | 665 | npinfo->rx_flags = 0; |
fbeec2e1 | 666 | npinfo->rx_np = NULL; |
2bdfe0ba | 667 | |
a9f6a0dd | 668 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 669 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 670 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 671 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 672 | |
93ec2c72 SH |
673 | atomic_set(&npinfo->refcnt, 1); |
674 | } else { | |
115c1d6e | 675 | npinfo = ndev->npinfo; |
93ec2c72 SH |
676 | atomic_inc(&npinfo->refcnt); |
677 | } | |
1da177e4 LT |
678 | |
679 | if (!ndev->poll_controller) { | |
680 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
681 | np->name, np->dev_name); | |
b41848b6 | 682 | err = -ENOTSUPP; |
1da177e4 LT |
683 | goto release; |
684 | } | |
685 | ||
686 | if (!netif_running(ndev)) { | |
687 | unsigned long atmost, atleast; | |
688 | ||
689 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
690 | np->name, np->dev_name); | |
691 | ||
6756ae4b | 692 | rtnl_lock(); |
b41848b6 SH |
693 | err = dev_open(ndev); |
694 | rtnl_unlock(); | |
695 | ||
696 | if (err) { | |
1da177e4 | 697 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 698 | np->name, ndev->name); |
1da177e4 LT |
699 | goto release; |
700 | } | |
1da177e4 LT |
701 | |
702 | atleast = jiffies + HZ/10; | |
4ec93edb | 703 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
704 | while (!netif_carrier_ok(ndev)) { |
705 | if (time_after(jiffies, atmost)) { | |
706 | printk(KERN_NOTICE | |
707 | "%s: timeout waiting for carrier\n", | |
708 | np->name); | |
709 | break; | |
710 | } | |
711 | cond_resched(); | |
712 | } | |
713 | ||
714 | /* If carrier appears to come up instantly, we don't | |
715 | * trust it and pause so that we don't pump all our | |
716 | * queued console messages into the bitbucket. | |
717 | */ | |
718 | ||
719 | if (time_before(jiffies, atleast)) { | |
720 | printk(KERN_NOTICE "%s: carrier detect appears" | |
721 | " untrustworthy, waiting 4 seconds\n", | |
722 | np->name); | |
723 | msleep(4000); | |
724 | } | |
725 | } | |
726 | ||
3860288e | 727 | if (is_zero_ether_addr(np->local_mac) && ndev->dev_addr) |
1da177e4 LT |
728 | memcpy(np->local_mac, ndev->dev_addr, 6); |
729 | ||
730 | if (!np->local_ip) { | |
731 | rcu_read_lock(); | |
e5ed6399 | 732 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
733 | |
734 | if (!in_dev || !in_dev->ifa_list) { | |
735 | rcu_read_unlock(); | |
736 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
737 | np->name, np->dev_name); | |
b41848b6 | 738 | err = -EDESTADDRREQ; |
1da177e4 LT |
739 | goto release; |
740 | } | |
741 | ||
742 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
743 | rcu_read_unlock(); | |
744 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
745 | np->name, HIPQUAD(np->local_ip)); | |
746 | } | |
747 | ||
fbeec2e1 JM |
748 | if (np->rx_hook) { |
749 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
750 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
751 | npinfo->rx_np = np; | |
752 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
753 | } | |
26520765 IM |
754 | |
755 | /* fill up the skb queue */ | |
756 | refill_skbs(); | |
757 | ||
fbeec2e1 | 758 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 759 | ndev->npinfo = npinfo; |
1da177e4 | 760 | |
53fb95d3 MM |
761 | /* avoid racing with NAPI reading npinfo */ |
762 | synchronize_rcu(); | |
763 | ||
1da177e4 LT |
764 | return 0; |
765 | ||
766 | release: | |
115c1d6e JM |
767 | if (!ndev->npinfo) |
768 | kfree(npinfo); | |
1da177e4 LT |
769 | np->dev = NULL; |
770 | dev_put(ndev); | |
b41848b6 | 771 | return err; |
1da177e4 LT |
772 | } |
773 | ||
c68b9070 DM |
774 | static int __init netpoll_init(void) |
775 | { | |
a1bcfacd SH |
776 | skb_queue_head_init(&skb_pool); |
777 | return 0; | |
778 | } | |
779 | core_initcall(netpoll_init); | |
780 | ||
1da177e4 LT |
781 | void netpoll_cleanup(struct netpoll *np) |
782 | { | |
fbeec2e1 JM |
783 | struct netpoll_info *npinfo; |
784 | unsigned long flags; | |
785 | ||
115c1d6e | 786 | if (np->dev) { |
fbeec2e1 | 787 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
788 | if (npinfo) { |
789 | if (npinfo->rx_np == np) { | |
790 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
791 | npinfo->rx_np = NULL; | |
792 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
793 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
794 | } | |
795 | ||
93ec2c72 SH |
796 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
797 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 798 | skb_queue_purge(&npinfo->txq); |
25442caf | 799 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 800 | |
17200811 JP |
801 | /* clean after last, unfinished work */ |
802 | if (!skb_queue_empty(&npinfo->txq)) { | |
803 | struct sk_buff *skb; | |
804 | skb = __skb_dequeue(&npinfo->txq); | |
805 | kfree_skb(skb); | |
806 | } | |
93ec2c72 | 807 | kfree(npinfo); |
1498b3f1 | 808 | np->dev->npinfo = NULL; |
93ec2c72 | 809 | } |
fbeec2e1 | 810 | } |
93ec2c72 | 811 | |
115c1d6e JM |
812 | dev_put(np->dev); |
813 | } | |
fbeec2e1 | 814 | |
1da177e4 LT |
815 | np->dev = NULL; |
816 | } | |
817 | ||
818 | int netpoll_trap(void) | |
819 | { | |
820 | return atomic_read(&trapped); | |
821 | } | |
822 | ||
823 | void netpoll_set_trap(int trap) | |
824 | { | |
825 | if (trap) | |
826 | atomic_inc(&trapped); | |
827 | else | |
828 | atomic_dec(&trapped); | |
829 | } | |
830 | ||
831 | EXPORT_SYMBOL(netpoll_set_trap); | |
832 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 833 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
834 | EXPORT_SYMBOL(netpoll_parse_options); |
835 | EXPORT_SYMBOL(netpoll_setup); | |
836 | EXPORT_SYMBOL(netpoll_cleanup); | |
837 | EXPORT_SYMBOL(netpoll_send_udp); | |
838 | EXPORT_SYMBOL(netpoll_poll); |