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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 |
d9452e9f DM |
42 | #define NETPOLL_RX_ENABLED 1 |
43 | #define NETPOLL_RX_DROP 2 | |
1da177e4 LT |
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; | |
fd2ea0a7 | 61 | struct netdev_queue *txq; |
1da177e4 | 62 | |
6c43ff18 SH |
63 | if (!netif_device_present(dev) || !netif_running(dev)) { |
64 | __kfree_skb(skb); | |
65 | continue; | |
66 | } | |
1da177e4 | 67 | |
fd2ea0a7 DM |
68 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
69 | ||
3640543d | 70 | local_irq_save(flags); |
fd2ea0a7 DM |
71 | __netif_tx_lock(txq, smp_processor_id()); |
72 | if (netif_tx_queue_stopped(txq) || | |
c3f26a26 | 73 | netif_tx_queue_frozen(txq) || |
fd2ea0a7 | 74 | dev->hard_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 75 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 76 | __netif_tx_unlock(txq); |
3640543d | 77 | local_irq_restore(flags); |
1da177e4 | 78 | |
25442caf | 79 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
80 | return; |
81 | } | |
fd2ea0a7 | 82 | __netif_tx_unlock(txq); |
3640543d | 83 | local_irq_restore(flags); |
1da177e4 | 84 | } |
1da177e4 LT |
85 | } |
86 | ||
b51655b9 AV |
87 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
88 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 89 | { |
d6f5493c | 90 | __wsum psum; |
fb286bb2 | 91 | |
60476372 | 92 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
93 | return 0; |
94 | ||
fb286bb2 HX |
95 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
96 | ||
84fa7933 | 97 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 98 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 99 | return 0; |
1da177e4 | 100 | |
fb286bb2 | 101 | skb->csum = psum; |
1da177e4 | 102 | |
fb286bb2 | 103 | return __skb_checksum_complete(skb); |
1da177e4 LT |
104 | } |
105 | ||
106 | /* | |
107 | * Check whether delayed processing was scheduled for our NIC. If so, | |
108 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
109 | * If this fails, either we've recursed in ->poll() or it's already | |
110 | * running on another CPU. | |
111 | * | |
112 | * Note: we don't mask interrupts with this lock because we're using | |
113 | * trylock here and interrupts are already disabled in the softirq | |
114 | * case. Further, we test the poll_owner to avoid recursion on UP | |
115 | * systems where the lock doesn't exist. | |
116 | * | |
117 | * In cases where there is bi-directional communications, reading only | |
118 | * one message at a time can lead to packets being dropped by the | |
119 | * network adapter, forcing superfluous retries and possibly timeouts. | |
120 | * Thus, we set our budget to greater than 1. | |
121 | */ | |
0a7606c1 DM |
122 | static int poll_one_napi(struct netpoll_info *npinfo, |
123 | struct napi_struct *napi, int budget) | |
124 | { | |
125 | int work; | |
126 | ||
127 | /* net_rx_action's ->poll() invocations and our's are | |
128 | * synchronized by this test which is only made while | |
129 | * holding the napi->poll_lock. | |
130 | */ | |
131 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
132 | return budget; | |
133 | ||
d9452e9f | 134 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 DM |
135 | atomic_inc(&trapped); |
136 | ||
137 | work = napi->poll(napi, budget); | |
138 | ||
139 | atomic_dec(&trapped); | |
d9452e9f | 140 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
141 | |
142 | return budget - work; | |
143 | } | |
144 | ||
5106930b | 145 | static void poll_napi(struct net_device *dev) |
1da177e4 | 146 | { |
bea3348e | 147 | struct napi_struct *napi; |
1da177e4 LT |
148 | int budget = 16; |
149 | ||
5106930b | 150 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 151 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 152 | spin_trylock(&napi->poll_lock)) { |
5106930b | 153 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 154 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
155 | |
156 | if (!budget) | |
157 | break; | |
bea3348e | 158 | } |
1da177e4 LT |
159 | } |
160 | } | |
161 | ||
068c6e98 NH |
162 | static void service_arp_queue(struct netpoll_info *npi) |
163 | { | |
5106930b SH |
164 | if (npi) { |
165 | struct sk_buff *skb; | |
068c6e98 | 166 | |
5106930b SH |
167 | while ((skb = skb_dequeue(&npi->arp_tx))) |
168 | arp_reply(skb); | |
068c6e98 | 169 | } |
068c6e98 NH |
170 | } |
171 | ||
1da177e4 LT |
172 | void netpoll_poll(struct netpoll *np) |
173 | { | |
5106930b SH |
174 | struct net_device *dev = np->dev; |
175 | ||
176 | if (!dev || !netif_running(dev) || !dev->poll_controller) | |
1da177e4 LT |
177 | return; |
178 | ||
179 | /* Process pending work on NIC */ | |
5106930b SH |
180 | dev->poll_controller(dev); |
181 | ||
182 | poll_napi(dev); | |
1da177e4 | 183 | |
5106930b | 184 | service_arp_queue(dev->npinfo); |
068c6e98 | 185 | |
1da177e4 LT |
186 | zap_completion_queue(); |
187 | } | |
188 | ||
189 | static void refill_skbs(void) | |
190 | { | |
191 | struct sk_buff *skb; | |
192 | unsigned long flags; | |
193 | ||
a1bcfacd SH |
194 | spin_lock_irqsave(&skb_pool.lock, flags); |
195 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
196 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
197 | if (!skb) | |
198 | break; | |
199 | ||
a1bcfacd | 200 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 201 | } |
a1bcfacd | 202 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
203 | } |
204 | ||
205 | static void zap_completion_queue(void) | |
206 | { | |
207 | unsigned long flags; | |
208 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
209 | ||
210 | if (sd->completion_queue) { | |
211 | struct sk_buff *clist; | |
212 | ||
213 | local_irq_save(flags); | |
214 | clist = sd->completion_queue; | |
215 | sd->completion_queue = NULL; | |
216 | local_irq_restore(flags); | |
217 | ||
218 | while (clist != NULL) { | |
219 | struct sk_buff *skb = clist; | |
220 | clist = clist->next; | |
8a455b08 JP |
221 | if (skb->destructor) { |
222 | atomic_inc(&skb->users); | |
1da177e4 | 223 | dev_kfree_skb_any(skb); /* put this one back */ |
8a455b08 | 224 | } else { |
1da177e4 | 225 | __kfree_skb(skb); |
8a455b08 | 226 | } |
1da177e4 LT |
227 | } |
228 | } | |
229 | ||
230 | put_cpu_var(softnet_data); | |
231 | } | |
232 | ||
a1bcfacd | 233 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 234 | { |
a1bcfacd SH |
235 | int count = 0; |
236 | struct sk_buff *skb; | |
1da177e4 LT |
237 | |
238 | zap_completion_queue(); | |
a1bcfacd | 239 | refill_skbs(); |
1da177e4 | 240 | repeat: |
1da177e4 LT |
241 | |
242 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
243 | if (!skb) |
244 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
245 | |
246 | if (!skb) { | |
a1bcfacd SH |
247 | if (++count < 10) { |
248 | netpoll_poll(np); | |
249 | goto repeat; | |
1da177e4 | 250 | } |
a1bcfacd | 251 | return NULL; |
1da177e4 LT |
252 | } |
253 | ||
254 | atomic_set(&skb->users, 1); | |
255 | skb_reserve(skb, reserve); | |
256 | return skb; | |
257 | } | |
258 | ||
bea3348e SH |
259 | static int netpoll_owner_active(struct net_device *dev) |
260 | { | |
261 | struct napi_struct *napi; | |
262 | ||
263 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
264 | if (napi->poll_owner == smp_processor_id()) | |
265 | return 1; | |
266 | } | |
267 | return 0; | |
268 | } | |
269 | ||
1da177e4 LT |
270 | static void netpoll_send_skb(struct netpoll *np, struct sk_buff *skb) |
271 | { | |
2bdfe0ba SH |
272 | int status = NETDEV_TX_BUSY; |
273 | unsigned long tries; | |
4ec93edb YH |
274 | struct net_device *dev = np->dev; |
275 | struct netpoll_info *npinfo = np->dev->npinfo; | |
2bdfe0ba | 276 | |
4ec93edb YH |
277 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
278 | __kfree_skb(skb); | |
279 | return; | |
280 | } | |
2bdfe0ba SH |
281 | |
282 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 283 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 284 | struct netdev_queue *txq; |
a49f99ff AM |
285 | unsigned long flags; |
286 | ||
fd2ea0a7 DM |
287 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
288 | ||
a49f99ff | 289 | local_irq_save(flags); |
0db3dc73 SH |
290 | /* try until next clock tick */ |
291 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
292 | tries > 0; --tries) { | |
fd2ea0a7 DM |
293 | if (__netif_tx_trylock(txq)) { |
294 | if (!netif_tx_queue_stopped(txq)) | |
e37b8d93 | 295 | status = dev->hard_start_xmit(skb, dev); |
fd2ea0a7 | 296 | __netif_tx_unlock(txq); |
e37b8d93 AM |
297 | |
298 | if (status == NETDEV_TX_OK) | |
299 | break; | |
300 | ||
e37b8d93 | 301 | } |
0db3dc73 SH |
302 | |
303 | /* tickle device maybe there is some cleanup */ | |
304 | netpoll_poll(np); | |
305 | ||
306 | udelay(USEC_PER_POLL); | |
0db1d6fc | 307 | } |
a49f99ff | 308 | local_irq_restore(flags); |
1da177e4 | 309 | } |
1da177e4 | 310 | |
2bdfe0ba | 311 | if (status != NETDEV_TX_OK) { |
5de4a473 | 312 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 313 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 314 | } |
1da177e4 LT |
315 | } |
316 | ||
317 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
318 | { | |
319 | int total_len, eth_len, ip_len, udp_len; | |
320 | struct sk_buff *skb; | |
321 | struct udphdr *udph; | |
322 | struct iphdr *iph; | |
323 | struct ethhdr *eth; | |
324 | ||
325 | udp_len = len + sizeof(*udph); | |
326 | ip_len = eth_len = udp_len + sizeof(*iph); | |
327 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
328 | ||
329 | skb = find_skb(np, total_len, total_len - len); | |
330 | if (!skb) | |
331 | return; | |
332 | ||
27d7ff46 | 333 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
334 | skb->len += len; |
335 | ||
4bedb452 ACM |
336 | skb_push(skb, sizeof(*udph)); |
337 | skb_reset_transport_header(skb); | |
338 | udph = udp_hdr(skb); | |
1da177e4 LT |
339 | udph->source = htons(np->local_port); |
340 | udph->dest = htons(np->remote_port); | |
341 | udph->len = htons(udp_len); | |
342 | udph->check = 0; | |
8e365eec CL |
343 | udph->check = csum_tcpudp_magic(htonl(np->local_ip), |
344 | htonl(np->remote_ip), | |
345 | udp_len, IPPROTO_UDP, | |
346 | csum_partial((unsigned char *)udph, udp_len, 0)); | |
347 | if (udph->check == 0) | |
5e57dff2 | 348 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 349 | |
e2d1bca7 ACM |
350 | skb_push(skb, sizeof(*iph)); |
351 | skb_reset_network_header(skb); | |
eddc9ec5 | 352 | iph = ip_hdr(skb); |
1da177e4 LT |
353 | |
354 | /* iph->version = 4; iph->ihl = 5; */ | |
355 | put_unaligned(0x45, (unsigned char *)iph); | |
356 | iph->tos = 0; | |
357 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
358 | iph->id = 0; | |
359 | iph->frag_off = 0; | |
360 | iph->ttl = 64; | |
361 | iph->protocol = IPPROTO_UDP; | |
362 | iph->check = 0; | |
363 | put_unaligned(htonl(np->local_ip), &(iph->saddr)); | |
364 | put_unaligned(htonl(np->remote_ip), &(iph->daddr)); | |
365 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
366 | ||
367 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 368 | skb_reset_mac_header(skb); |
206daaf7 | 369 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
370 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
371 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
372 | |
373 | skb->dev = np->dev; | |
374 | ||
375 | netpoll_send_skb(np, skb); | |
376 | } | |
377 | ||
378 | static void arp_reply(struct sk_buff *skb) | |
379 | { | |
115c1d6e | 380 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
381 | struct arphdr *arp; |
382 | unsigned char *arp_ptr; | |
383 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 384 | __be32 sip, tip; |
47bbec02 | 385 | unsigned char *sha; |
1da177e4 | 386 | struct sk_buff *send_skb; |
115c1d6e | 387 | struct netpoll *np = NULL; |
1da177e4 | 388 | |
fbeec2e1 JM |
389 | if (npinfo->rx_np && npinfo->rx_np->dev == skb->dev) |
390 | np = npinfo->rx_np; | |
115c1d6e JM |
391 | if (!np) |
392 | return; | |
1da177e4 LT |
393 | |
394 | /* No arp on this interface */ | |
395 | if (skb->dev->flags & IFF_NOARP) | |
396 | return; | |
397 | ||
988b7050 | 398 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
399 | return; |
400 | ||
c1d2bbe1 | 401 | skb_reset_network_header(skb); |
badff6d0 | 402 | skb_reset_transport_header(skb); |
d0a92be0 | 403 | arp = arp_hdr(skb); |
1da177e4 LT |
404 | |
405 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
406 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
407 | arp->ar_pro != htons(ETH_P_IP) || | |
408 | arp->ar_op != htons(ARPOP_REQUEST)) | |
409 | return; | |
410 | ||
47bbec02 NH |
411 | arp_ptr = (unsigned char *)(arp+1); |
412 | /* save the location of the src hw addr */ | |
413 | sha = arp_ptr; | |
414 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 415 | memcpy(&sip, arp_ptr, 4); |
47bbec02 NH |
416 | arp_ptr += 4; |
417 | /* if we actually cared about dst hw addr, it would get copied here */ | |
418 | arp_ptr += skb->dev->addr_len; | |
1da177e4 LT |
419 | memcpy(&tip, arp_ptr, 4); |
420 | ||
421 | /* Should we ignore arp? */ | |
21cf2253 JP |
422 | if (tip != htonl(np->local_ip) || |
423 | ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) | |
1da177e4 LT |
424 | return; |
425 | ||
988b7050 | 426 | size = arp_hdr_len(skb->dev); |
f5184d26 | 427 | send_skb = find_skb(np, size + LL_ALLOCATED_SPACE(np->dev), |
1da177e4 LT |
428 | LL_RESERVED_SPACE(np->dev)); |
429 | ||
430 | if (!send_skb) | |
431 | return; | |
432 | ||
c1d2bbe1 | 433 | skb_reset_network_header(send_skb); |
1da177e4 LT |
434 | arp = (struct arphdr *) skb_put(send_skb, size); |
435 | send_skb->dev = skb->dev; | |
436 | send_skb->protocol = htons(ETH_P_ARP); | |
437 | ||
438 | /* Fill the device header for the ARP frame */ | |
0c4e8581 | 439 | if (dev_hard_header(send_skb, skb->dev, ptype, |
09538641 | 440 | sha, np->dev->dev_addr, |
0c4e8581 | 441 | send_skb->len) < 0) { |
1da177e4 LT |
442 | kfree_skb(send_skb); |
443 | return; | |
444 | } | |
445 | ||
446 | /* | |
447 | * Fill out the arp protocol part. | |
448 | * | |
449 | * we only support ethernet device type, | |
450 | * which (according to RFC 1390) should always equal 1 (Ethernet). | |
451 | */ | |
452 | ||
453 | arp->ar_hrd = htons(np->dev->type); | |
454 | arp->ar_pro = htons(ETH_P_IP); | |
455 | arp->ar_hln = np->dev->addr_len; | |
456 | arp->ar_pln = 4; | |
457 | arp->ar_op = htons(type); | |
458 | ||
459 | arp_ptr=(unsigned char *)(arp + 1); | |
460 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
461 | arp_ptr += np->dev->addr_len; | |
462 | memcpy(arp_ptr, &tip, 4); | |
463 | arp_ptr += 4; | |
47bbec02 | 464 | memcpy(arp_ptr, sha, np->dev->addr_len); |
1da177e4 LT |
465 | arp_ptr += np->dev->addr_len; |
466 | memcpy(arp_ptr, &sip, 4); | |
467 | ||
468 | netpoll_send_skb(np, send_skb); | |
469 | } | |
470 | ||
471 | int __netpoll_rx(struct sk_buff *skb) | |
472 | { | |
473 | int proto, len, ulen; | |
474 | struct iphdr *iph; | |
475 | struct udphdr *uh; | |
068c6e98 NH |
476 | struct netpoll_info *npi = skb->dev->npinfo; |
477 | struct netpoll *np = npi->rx_np; | |
478 | ||
fbeec2e1 | 479 | if (!np) |
1da177e4 LT |
480 | goto out; |
481 | if (skb->dev->type != ARPHRD_ETHER) | |
482 | goto out; | |
483 | ||
d9452e9f | 484 | /* check if netpoll clients need ARP */ |
724800d6 | 485 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 486 | atomic_read(&trapped)) { |
068c6e98 | 487 | skb_queue_tail(&npi->arp_tx, skb); |
1da177e4 LT |
488 | return 1; |
489 | } | |
490 | ||
491 | proto = ntohs(eth_hdr(skb)->h_proto); | |
492 | if (proto != ETH_P_IP) | |
493 | goto out; | |
494 | if (skb->pkt_type == PACKET_OTHERHOST) | |
495 | goto out; | |
496 | if (skb_shared(skb)) | |
497 | goto out; | |
498 | ||
499 | iph = (struct iphdr *)skb->data; | |
500 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) | |
501 | goto out; | |
502 | if (iph->ihl < 5 || iph->version != 4) | |
503 | goto out; | |
504 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
505 | goto out; | |
506 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) | |
507 | goto out; | |
508 | ||
509 | len = ntohs(iph->tot_len); | |
510 | if (skb->len < len || len < iph->ihl*4) | |
511 | goto out; | |
512 | ||
5e7d7fa5 AL |
513 | /* |
514 | * Our transport medium may have padded the buffer out. | |
515 | * Now We trim to the true length of the frame. | |
516 | */ | |
517 | if (pskb_trim_rcsum(skb, len)) | |
518 | goto out; | |
519 | ||
1da177e4 LT |
520 | if (iph->protocol != IPPROTO_UDP) |
521 | goto out; | |
522 | ||
523 | len -= iph->ihl*4; | |
524 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
525 | ulen = ntohs(uh->len); | |
526 | ||
527 | if (ulen != len) | |
528 | goto out; | |
fb286bb2 | 529 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 LT |
530 | goto out; |
531 | if (np->local_ip && np->local_ip != ntohl(iph->daddr)) | |
532 | goto out; | |
533 | if (np->remote_ip && np->remote_ip != ntohl(iph->saddr)) | |
534 | goto out; | |
535 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
536 | goto out; | |
537 | ||
538 | np->rx_hook(np, ntohs(uh->source), | |
539 | (char *)(uh+1), | |
540 | ulen - sizeof(struct udphdr)); | |
541 | ||
542 | kfree_skb(skb); | |
543 | return 1; | |
544 | ||
545 | out: | |
546 | if (atomic_read(&trapped)) { | |
547 | kfree_skb(skb); | |
548 | return 1; | |
549 | } | |
550 | ||
551 | return 0; | |
552 | } | |
553 | ||
0bcc1816 SS |
554 | void netpoll_print_options(struct netpoll *np) |
555 | { | |
0795af57 | 556 | DECLARE_MAC_BUF(mac); |
0bcc1816 SS |
557 | printk(KERN_INFO "%s: local port %d\n", |
558 | np->name, np->local_port); | |
559 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
560 | np->name, HIPQUAD(np->local_ip)); | |
561 | printk(KERN_INFO "%s: interface %s\n", | |
562 | np->name, np->dev_name); | |
563 | printk(KERN_INFO "%s: remote port %d\n", | |
564 | np->name, np->remote_port); | |
565 | printk(KERN_INFO "%s: remote IP %d.%d.%d.%d\n", | |
566 | np->name, HIPQUAD(np->remote_ip)); | |
0795af57 JP |
567 | printk(KERN_INFO "%s: remote ethernet address %s\n", |
568 | np->name, print_mac(mac, np->remote_mac)); | |
0bcc1816 SS |
569 | } |
570 | ||
1da177e4 LT |
571 | int netpoll_parse_options(struct netpoll *np, char *opt) |
572 | { | |
573 | char *cur=opt, *delim; | |
574 | ||
c68b9070 | 575 | if (*cur != '@') { |
1da177e4 LT |
576 | if ((delim = strchr(cur, '@')) == NULL) |
577 | goto parse_failed; | |
c68b9070 DM |
578 | *delim = 0; |
579 | np->local_port = simple_strtol(cur, NULL, 10); | |
580 | cur = delim; | |
1da177e4 LT |
581 | } |
582 | cur++; | |
1da177e4 | 583 | |
c68b9070 | 584 | if (*cur != '/') { |
1da177e4 LT |
585 | if ((delim = strchr(cur, '/')) == NULL) |
586 | goto parse_failed; | |
c68b9070 DM |
587 | *delim = 0; |
588 | np->local_ip = ntohl(in_aton(cur)); | |
589 | cur = delim; | |
1da177e4 LT |
590 | } |
591 | cur++; | |
592 | ||
c68b9070 | 593 | if (*cur != ',') { |
1da177e4 LT |
594 | /* parse out dev name */ |
595 | if ((delim = strchr(cur, ',')) == NULL) | |
596 | goto parse_failed; | |
c68b9070 | 597 | *delim = 0; |
1da177e4 | 598 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 599 | cur = delim; |
1da177e4 LT |
600 | } |
601 | cur++; | |
602 | ||
c68b9070 | 603 | if (*cur != '@') { |
1da177e4 LT |
604 | /* dst port */ |
605 | if ((delim = strchr(cur, '@')) == NULL) | |
606 | goto parse_failed; | |
c68b9070 DM |
607 | *delim = 0; |
608 | np->remote_port = simple_strtol(cur, NULL, 10); | |
609 | cur = delim; | |
1da177e4 LT |
610 | } |
611 | cur++; | |
1da177e4 LT |
612 | |
613 | /* dst ip */ | |
614 | if ((delim = strchr(cur, '/')) == NULL) | |
615 | goto parse_failed; | |
c68b9070 DM |
616 | *delim = 0; |
617 | np->remote_ip = ntohl(in_aton(cur)); | |
618 | cur = delim + 1; | |
1da177e4 | 619 | |
c68b9070 | 620 | if (*cur != 0) { |
1da177e4 LT |
621 | /* MAC address */ |
622 | if ((delim = strchr(cur, ':')) == NULL) | |
623 | goto parse_failed; | |
c68b9070 DM |
624 | *delim = 0; |
625 | np->remote_mac[0] = simple_strtol(cur, NULL, 16); | |
626 | cur = delim + 1; | |
1da177e4 LT |
627 | if ((delim = strchr(cur, ':')) == NULL) |
628 | goto parse_failed; | |
c68b9070 DM |
629 | *delim = 0; |
630 | np->remote_mac[1] = simple_strtol(cur, NULL, 16); | |
631 | cur = delim + 1; | |
1da177e4 LT |
632 | if ((delim = strchr(cur, ':')) == NULL) |
633 | goto parse_failed; | |
c68b9070 DM |
634 | *delim = 0; |
635 | np->remote_mac[2] = simple_strtol(cur, NULL, 16); | |
636 | cur = delim + 1; | |
1da177e4 LT |
637 | if ((delim = strchr(cur, ':')) == NULL) |
638 | goto parse_failed; | |
c68b9070 DM |
639 | *delim = 0; |
640 | np->remote_mac[3] = simple_strtol(cur, NULL, 16); | |
641 | cur = delim + 1; | |
1da177e4 LT |
642 | if ((delim = strchr(cur, ':')) == NULL) |
643 | goto parse_failed; | |
c68b9070 DM |
644 | *delim = 0; |
645 | np->remote_mac[4] = simple_strtol(cur, NULL, 16); | |
646 | cur = delim + 1; | |
647 | np->remote_mac[5] = simple_strtol(cur, NULL, 16); | |
1da177e4 LT |
648 | } |
649 | ||
0bcc1816 | 650 | netpoll_print_options(np); |
1da177e4 LT |
651 | |
652 | return 0; | |
653 | ||
654 | parse_failed: | |
655 | printk(KERN_INFO "%s: couldn't parse config at %s!\n", | |
656 | np->name, cur); | |
657 | return -1; | |
658 | } | |
659 | ||
660 | int netpoll_setup(struct netpoll *np) | |
661 | { | |
662 | struct net_device *ndev = NULL; | |
663 | struct in_device *in_dev; | |
115c1d6e | 664 | struct netpoll_info *npinfo; |
fbeec2e1 | 665 | unsigned long flags; |
b41848b6 | 666 | int err; |
1da177e4 LT |
667 | |
668 | if (np->dev_name) | |
881d966b | 669 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
670 | if (!ndev) { |
671 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
672 | np->name, np->dev_name); | |
b41848b6 | 673 | return -ENODEV; |
1da177e4 LT |
674 | } |
675 | ||
676 | np->dev = ndev; | |
115c1d6e JM |
677 | if (!ndev->npinfo) { |
678 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
b41848b6 SH |
679 | if (!npinfo) { |
680 | err = -ENOMEM; | |
115c1d6e | 681 | goto release; |
b41848b6 | 682 | } |
115c1d6e | 683 | |
d9452e9f | 684 | npinfo->rx_flags = 0; |
fbeec2e1 | 685 | npinfo->rx_np = NULL; |
2bdfe0ba | 686 | |
a9f6a0dd | 687 | spin_lock_init(&npinfo->rx_lock); |
068c6e98 | 688 | skb_queue_head_init(&npinfo->arp_tx); |
b6cd27ed | 689 | skb_queue_head_init(&npinfo->txq); |
4c1ac1b4 | 690 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); |
b6cd27ed | 691 | |
93ec2c72 SH |
692 | atomic_set(&npinfo->refcnt, 1); |
693 | } else { | |
115c1d6e | 694 | npinfo = ndev->npinfo; |
93ec2c72 SH |
695 | atomic_inc(&npinfo->refcnt); |
696 | } | |
1da177e4 LT |
697 | |
698 | if (!ndev->poll_controller) { | |
699 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
700 | np->name, np->dev_name); | |
b41848b6 | 701 | err = -ENOTSUPP; |
1da177e4 LT |
702 | goto release; |
703 | } | |
704 | ||
705 | if (!netif_running(ndev)) { | |
706 | unsigned long atmost, atleast; | |
707 | ||
708 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
709 | np->name, np->dev_name); | |
710 | ||
6756ae4b | 711 | rtnl_lock(); |
b41848b6 SH |
712 | err = dev_open(ndev); |
713 | rtnl_unlock(); | |
714 | ||
715 | if (err) { | |
1da177e4 | 716 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 717 | np->name, ndev->name); |
1da177e4 LT |
718 | goto release; |
719 | } | |
1da177e4 LT |
720 | |
721 | atleast = jiffies + HZ/10; | |
4ec93edb | 722 | atmost = jiffies + 4*HZ; |
1da177e4 LT |
723 | while (!netif_carrier_ok(ndev)) { |
724 | if (time_after(jiffies, atmost)) { | |
725 | printk(KERN_NOTICE | |
726 | "%s: timeout waiting for carrier\n", | |
727 | np->name); | |
728 | break; | |
729 | } | |
730 | cond_resched(); | |
731 | } | |
732 | ||
733 | /* If carrier appears to come up instantly, we don't | |
734 | * trust it and pause so that we don't pump all our | |
735 | * queued console messages into the bitbucket. | |
736 | */ | |
737 | ||
738 | if (time_before(jiffies, atleast)) { | |
739 | printk(KERN_NOTICE "%s: carrier detect appears" | |
740 | " untrustworthy, waiting 4 seconds\n", | |
741 | np->name); | |
742 | msleep(4000); | |
743 | } | |
744 | } | |
745 | ||
1da177e4 LT |
746 | if (!np->local_ip) { |
747 | rcu_read_lock(); | |
e5ed6399 | 748 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
749 | |
750 | if (!in_dev || !in_dev->ifa_list) { | |
751 | rcu_read_unlock(); | |
752 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
753 | np->name, np->dev_name); | |
b41848b6 | 754 | err = -EDESTADDRREQ; |
1da177e4 LT |
755 | goto release; |
756 | } | |
757 | ||
758 | np->local_ip = ntohl(in_dev->ifa_list->ifa_local); | |
759 | rcu_read_unlock(); | |
760 | printk(KERN_INFO "%s: local IP %d.%d.%d.%d\n", | |
761 | np->name, HIPQUAD(np->local_ip)); | |
762 | } | |
763 | ||
fbeec2e1 JM |
764 | if (np->rx_hook) { |
765 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
d9452e9f | 766 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; |
fbeec2e1 JM |
767 | npinfo->rx_np = np; |
768 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
769 | } | |
26520765 IM |
770 | |
771 | /* fill up the skb queue */ | |
772 | refill_skbs(); | |
773 | ||
fbeec2e1 | 774 | /* last thing to do is link it to the net device structure */ |
115c1d6e | 775 | ndev->npinfo = npinfo; |
1da177e4 | 776 | |
53fb95d3 MM |
777 | /* avoid racing with NAPI reading npinfo */ |
778 | synchronize_rcu(); | |
779 | ||
1da177e4 LT |
780 | return 0; |
781 | ||
782 | release: | |
115c1d6e JM |
783 | if (!ndev->npinfo) |
784 | kfree(npinfo); | |
1da177e4 LT |
785 | np->dev = NULL; |
786 | dev_put(ndev); | |
b41848b6 | 787 | return err; |
1da177e4 LT |
788 | } |
789 | ||
c68b9070 DM |
790 | static int __init netpoll_init(void) |
791 | { | |
a1bcfacd SH |
792 | skb_queue_head_init(&skb_pool); |
793 | return 0; | |
794 | } | |
795 | core_initcall(netpoll_init); | |
796 | ||
1da177e4 LT |
797 | void netpoll_cleanup(struct netpoll *np) |
798 | { | |
fbeec2e1 JM |
799 | struct netpoll_info *npinfo; |
800 | unsigned long flags; | |
801 | ||
115c1d6e | 802 | if (np->dev) { |
fbeec2e1 | 803 | npinfo = np->dev->npinfo; |
93ec2c72 SH |
804 | if (npinfo) { |
805 | if (npinfo->rx_np == np) { | |
806 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
807 | npinfo->rx_np = NULL; | |
d9452e9f | 808 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; |
93ec2c72 SH |
809 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); |
810 | } | |
811 | ||
93ec2c72 SH |
812 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
813 | skb_queue_purge(&npinfo->arp_tx); | |
4ec93edb | 814 | skb_queue_purge(&npinfo->txq); |
25442caf | 815 | cancel_rearming_delayed_work(&npinfo->tx_work); |
93ec2c72 | 816 | |
17200811 | 817 | /* clean after last, unfinished work */ |
0adc9add | 818 | __skb_queue_purge(&npinfo->txq); |
93ec2c72 | 819 | kfree(npinfo); |
1498b3f1 | 820 | np->dev->npinfo = NULL; |
93ec2c72 | 821 | } |
fbeec2e1 | 822 | } |
93ec2c72 | 823 | |
115c1d6e JM |
824 | dev_put(np->dev); |
825 | } | |
fbeec2e1 | 826 | |
1da177e4 LT |
827 | np->dev = NULL; |
828 | } | |
829 | ||
830 | int netpoll_trap(void) | |
831 | { | |
832 | return atomic_read(&trapped); | |
833 | } | |
834 | ||
835 | void netpoll_set_trap(int trap) | |
836 | { | |
837 | if (trap) | |
838 | atomic_inc(&trapped); | |
839 | else | |
840 | atomic_dec(&trapped); | |
841 | } | |
842 | ||
843 | EXPORT_SYMBOL(netpoll_set_trap); | |
844 | EXPORT_SYMBOL(netpoll_trap); | |
0bcc1816 | 845 | EXPORT_SYMBOL(netpoll_print_options); |
1da177e4 LT |
846 | EXPORT_SYMBOL(netpoll_parse_options); |
847 | EXPORT_SYMBOL(netpoll_setup); | |
848 | EXPORT_SYMBOL(netpoll_cleanup); | |
849 | EXPORT_SYMBOL(netpoll_send_udp); | |
850 | EXPORT_SYMBOL(netpoll_poll); |