Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Common framework for low-level network console, dump, and debugger code | |
3 | * | |
4 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> | |
5 | * | |
6 | * based on the netconsole code from: | |
7 | * | |
8 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> | |
9 | * Copyright (C) 2002 Red Hat, Inc. | |
10 | */ | |
11 | ||
bff38771 | 12 | #include <linux/moduleparam.h> |
1da177e4 LT |
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> | |
5a0e3ad6 | 25 | #include <linux/slab.h> |
bc3b2d7f | 26 | #include <linux/export.h> |
1da177e4 LT |
27 | #include <net/tcp.h> |
28 | #include <net/udp.h> | |
29 | #include <asm/unaligned.h> | |
9cbc1cb8 | 30 | #include <trace/events/napi.h> |
1da177e4 LT |
31 | |
32 | /* | |
33 | * We maintain a small pool of fully-sized skbs, to make sure the | |
34 | * message gets out even in extreme OOM situations. | |
35 | */ | |
36 | ||
37 | #define MAX_UDP_CHUNK 1460 | |
38 | #define MAX_SKBS 32 | |
1da177e4 | 39 | |
a1bcfacd | 40 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
41 | |
42 | static atomic_t trapped; | |
43 | ||
2bdfe0ba | 44 | #define USEC_PER_POLL 50 |
d9452e9f DM |
45 | #define NETPOLL_RX_ENABLED 1 |
46 | #define NETPOLL_RX_DROP 2 | |
1da177e4 LT |
47 | |
48 | #define MAX_SKB_SIZE \ | |
49 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
50 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
51 | ||
3578b0c8 | 52 | static void zap_completion_queue(void); |
068c6e98 | 53 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 54 | |
bff38771 AV |
55 | static unsigned int carrier_timeout = 4; |
56 | module_param(carrier_timeout, uint, 0644); | |
57 | ||
c4028958 | 58 | static void queue_process(struct work_struct *work) |
1da177e4 | 59 | { |
4c1ac1b4 DH |
60 | struct netpoll_info *npinfo = |
61 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 62 | struct sk_buff *skb; |
3640543d | 63 | unsigned long flags; |
1da177e4 | 64 | |
6c43ff18 SH |
65 | while ((skb = skb_dequeue(&npinfo->txq))) { |
66 | struct net_device *dev = skb->dev; | |
00829823 | 67 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 68 | struct netdev_queue *txq; |
1da177e4 | 69 | |
6c43ff18 SH |
70 | if (!netif_device_present(dev) || !netif_running(dev)) { |
71 | __kfree_skb(skb); | |
72 | continue; | |
73 | } | |
1da177e4 | 74 | |
fd2ea0a7 DM |
75 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
76 | ||
3640543d | 77 | local_irq_save(flags); |
fd2ea0a7 | 78 | __netif_tx_lock(txq, smp_processor_id()); |
73466498 | 79 | if (netif_xmit_frozen_or_stopped(txq) || |
00829823 | 80 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 81 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 82 | __netif_tx_unlock(txq); |
3640543d | 83 | local_irq_restore(flags); |
1da177e4 | 84 | |
25442caf | 85 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
86 | return; |
87 | } | |
fd2ea0a7 | 88 | __netif_tx_unlock(txq); |
3640543d | 89 | local_irq_restore(flags); |
1da177e4 | 90 | } |
1da177e4 LT |
91 | } |
92 | ||
b51655b9 AV |
93 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
94 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 95 | { |
d6f5493c | 96 | __wsum psum; |
fb286bb2 | 97 | |
60476372 | 98 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
99 | return 0; |
100 | ||
fb286bb2 HX |
101 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
102 | ||
84fa7933 | 103 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 104 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 105 | return 0; |
1da177e4 | 106 | |
fb286bb2 | 107 | skb->csum = psum; |
1da177e4 | 108 | |
fb286bb2 | 109 | return __skb_checksum_complete(skb); |
1da177e4 LT |
110 | } |
111 | ||
112 | /* | |
113 | * Check whether delayed processing was scheduled for our NIC. If so, | |
114 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
115 | * If this fails, either we've recursed in ->poll() or it's already | |
116 | * running on another CPU. | |
117 | * | |
118 | * Note: we don't mask interrupts with this lock because we're using | |
119 | * trylock here and interrupts are already disabled in the softirq | |
120 | * case. Further, we test the poll_owner to avoid recursion on UP | |
121 | * systems where the lock doesn't exist. | |
122 | * | |
123 | * In cases where there is bi-directional communications, reading only | |
124 | * one message at a time can lead to packets being dropped by the | |
125 | * network adapter, forcing superfluous retries and possibly timeouts. | |
126 | * Thus, we set our budget to greater than 1. | |
127 | */ | |
0a7606c1 DM |
128 | static int poll_one_napi(struct netpoll_info *npinfo, |
129 | struct napi_struct *napi, int budget) | |
130 | { | |
131 | int work; | |
132 | ||
133 | /* net_rx_action's ->poll() invocations and our's are | |
134 | * synchronized by this test which is only made while | |
135 | * holding the napi->poll_lock. | |
136 | */ | |
137 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
138 | return budget; | |
139 | ||
d9452e9f | 140 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 141 | atomic_inc(&trapped); |
7b363e44 | 142 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
143 | |
144 | work = napi->poll(napi, budget); | |
7d18f114 | 145 | trace_napi_poll(napi); |
0a7606c1 | 146 | |
7b363e44 | 147 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 148 | atomic_dec(&trapped); |
d9452e9f | 149 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
150 | |
151 | return budget - work; | |
152 | } | |
153 | ||
5106930b | 154 | static void poll_napi(struct net_device *dev) |
1da177e4 | 155 | { |
bea3348e | 156 | struct napi_struct *napi; |
1da177e4 LT |
157 | int budget = 16; |
158 | ||
f13d493d | 159 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 160 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 161 | spin_trylock(&napi->poll_lock)) { |
5106930b | 162 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 163 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
164 | |
165 | if (!budget) | |
166 | break; | |
bea3348e | 167 | } |
1da177e4 LT |
168 | } |
169 | } | |
170 | ||
068c6e98 NH |
171 | static void service_arp_queue(struct netpoll_info *npi) |
172 | { | |
5106930b SH |
173 | if (npi) { |
174 | struct sk_buff *skb; | |
068c6e98 | 175 | |
5106930b SH |
176 | while ((skb = skb_dequeue(&npi->arp_tx))) |
177 | arp_reply(skb); | |
068c6e98 | 178 | } |
068c6e98 NH |
179 | } |
180 | ||
234b921d | 181 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 182 | { |
5e392739 | 183 | const struct net_device_ops *ops; |
5106930b | 184 | |
5e392739 PE |
185 | if (!dev || !netif_running(dev)) |
186 | return; | |
187 | ||
188 | ops = dev->netdev_ops; | |
189 | if (!ops->ndo_poll_controller) | |
1da177e4 LT |
190 | return; |
191 | ||
192 | /* Process pending work on NIC */ | |
d314774c | 193 | ops->ndo_poll_controller(dev); |
5106930b SH |
194 | |
195 | poll_napi(dev); | |
1da177e4 | 196 | |
5a698af5 AW |
197 | if (dev->priv_flags & IFF_SLAVE) { |
198 | if (dev->npinfo) { | |
199 | struct net_device *bond_dev = dev->master; | |
200 | struct sk_buff *skb; | |
201 | while ((skb = skb_dequeue(&dev->npinfo->arp_tx))) { | |
202 | skb->dev = bond_dev; | |
203 | skb_queue_tail(&bond_dev->npinfo->arp_tx, skb); | |
204 | } | |
205 | } | |
206 | } | |
207 | ||
5106930b | 208 | service_arp_queue(dev->npinfo); |
068c6e98 | 209 | |
3578b0c8 | 210 | zap_completion_queue(); |
1da177e4 LT |
211 | } |
212 | ||
213 | static void refill_skbs(void) | |
214 | { | |
215 | struct sk_buff *skb; | |
216 | unsigned long flags; | |
217 | ||
a1bcfacd SH |
218 | spin_lock_irqsave(&skb_pool.lock, flags); |
219 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
220 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
221 | if (!skb) | |
222 | break; | |
223 | ||
a1bcfacd | 224 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 225 | } |
a1bcfacd | 226 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
227 | } |
228 | ||
3578b0c8 DM |
229 | static void zap_completion_queue(void) |
230 | { | |
231 | unsigned long flags; | |
232 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
233 | ||
234 | if (sd->completion_queue) { | |
235 | struct sk_buff *clist; | |
236 | ||
237 | local_irq_save(flags); | |
238 | clist = sd->completion_queue; | |
239 | sd->completion_queue = NULL; | |
240 | local_irq_restore(flags); | |
241 | ||
242 | while (clist != NULL) { | |
243 | struct sk_buff *skb = clist; | |
244 | clist = clist->next; | |
245 | if (skb->destructor) { | |
246 | atomic_inc(&skb->users); | |
247 | dev_kfree_skb_any(skb); /* put this one back */ | |
248 | } else { | |
249 | __kfree_skb(skb); | |
250 | } | |
251 | } | |
252 | } | |
253 | ||
254 | put_cpu_var(softnet_data); | |
255 | } | |
256 | ||
a1bcfacd | 257 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 258 | { |
a1bcfacd SH |
259 | int count = 0; |
260 | struct sk_buff *skb; | |
1da177e4 | 261 | |
3578b0c8 | 262 | zap_completion_queue(); |
a1bcfacd | 263 | refill_skbs(); |
1da177e4 | 264 | repeat: |
1da177e4 LT |
265 | |
266 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
267 | if (!skb) |
268 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
269 | |
270 | if (!skb) { | |
a1bcfacd | 271 | if (++count < 10) { |
2a49e001 | 272 | netpoll_poll_dev(np->dev); |
a1bcfacd | 273 | goto repeat; |
1da177e4 | 274 | } |
a1bcfacd | 275 | return NULL; |
1da177e4 LT |
276 | } |
277 | ||
278 | atomic_set(&skb->users, 1); | |
279 | skb_reserve(skb, reserve); | |
280 | return skb; | |
281 | } | |
282 | ||
bea3348e SH |
283 | static int netpoll_owner_active(struct net_device *dev) |
284 | { | |
285 | struct napi_struct *napi; | |
286 | ||
287 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
288 | if (napi->poll_owner == smp_processor_id()) | |
289 | return 1; | |
290 | } | |
291 | return 0; | |
292 | } | |
293 | ||
c2355e1a NH |
294 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
295 | struct net_device *dev) | |
1da177e4 | 296 | { |
2bdfe0ba SH |
297 | int status = NETDEV_TX_BUSY; |
298 | unsigned long tries; | |
00829823 | 299 | const struct net_device_ops *ops = dev->netdev_ops; |
de85d99e | 300 | /* It is up to the caller to keep npinfo alive. */ |
4ec93edb | 301 | struct netpoll_info *npinfo = np->dev->npinfo; |
2bdfe0ba | 302 | |
4ec93edb YH |
303 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
304 | __kfree_skb(skb); | |
305 | return; | |
306 | } | |
2bdfe0ba SH |
307 | |
308 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 309 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 310 | struct netdev_queue *txq; |
a49f99ff AM |
311 | unsigned long flags; |
312 | ||
fd2ea0a7 DM |
313 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
314 | ||
a49f99ff | 315 | local_irq_save(flags); |
0db3dc73 SH |
316 | /* try until next clock tick */ |
317 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
318 | tries > 0; --tries) { | |
fd2ea0a7 | 319 | if (__netif_tx_trylock(txq)) { |
73466498 | 320 | if (!netif_xmit_stopped(txq)) { |
00829823 | 321 | status = ops->ndo_start_xmit(skb, dev); |
08baf561 ED |
322 | if (status == NETDEV_TX_OK) |
323 | txq_trans_update(txq); | |
324 | } | |
fd2ea0a7 | 325 | __netif_tx_unlock(txq); |
e37b8d93 AM |
326 | |
327 | if (status == NETDEV_TX_OK) | |
328 | break; | |
329 | ||
e37b8d93 | 330 | } |
0db3dc73 SH |
331 | |
332 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 333 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
334 | |
335 | udelay(USEC_PER_POLL); | |
0db1d6fc | 336 | } |
79b1bee8 DD |
337 | |
338 | WARN_ONCE(!irqs_disabled(), | |
339 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", | |
340 | dev->name, ops->ndo_start_xmit); | |
341 | ||
a49f99ff | 342 | local_irq_restore(flags); |
1da177e4 | 343 | } |
1da177e4 | 344 | |
2bdfe0ba | 345 | if (status != NETDEV_TX_OK) { |
5de4a473 | 346 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 347 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 348 | } |
1da177e4 | 349 | } |
c2355e1a | 350 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
351 | |
352 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
353 | { | |
354 | int total_len, eth_len, ip_len, udp_len; | |
355 | struct sk_buff *skb; | |
356 | struct udphdr *udph; | |
357 | struct iphdr *iph; | |
358 | struct ethhdr *eth; | |
359 | ||
360 | udp_len = len + sizeof(*udph); | |
361 | ip_len = eth_len = udp_len + sizeof(*iph); | |
362 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
363 | ||
364 | skb = find_skb(np, total_len, total_len - len); | |
365 | if (!skb) | |
366 | return; | |
367 | ||
27d7ff46 | 368 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
369 | skb->len += len; |
370 | ||
4bedb452 ACM |
371 | skb_push(skb, sizeof(*udph)); |
372 | skb_reset_transport_header(skb); | |
373 | udph = udp_hdr(skb); | |
1da177e4 LT |
374 | udph->source = htons(np->local_port); |
375 | udph->dest = htons(np->remote_port); | |
376 | udph->len = htons(udp_len); | |
377 | udph->check = 0; | |
e7557af5 HH |
378 | udph->check = csum_tcpudp_magic(np->local_ip, |
379 | np->remote_ip, | |
8e365eec | 380 | udp_len, IPPROTO_UDP, |
07f0757a | 381 | csum_partial(udph, udp_len, 0)); |
8e365eec | 382 | if (udph->check == 0) |
5e57dff2 | 383 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 384 | |
e2d1bca7 ACM |
385 | skb_push(skb, sizeof(*iph)); |
386 | skb_reset_network_header(skb); | |
eddc9ec5 | 387 | iph = ip_hdr(skb); |
1da177e4 LT |
388 | |
389 | /* iph->version = 4; iph->ihl = 5; */ | |
390 | put_unaligned(0x45, (unsigned char *)iph); | |
391 | iph->tos = 0; | |
392 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
393 | iph->id = 0; | |
394 | iph->frag_off = 0; | |
395 | iph->ttl = 64; | |
396 | iph->protocol = IPPROTO_UDP; | |
397 | iph->check = 0; | |
e7557af5 HH |
398 | put_unaligned(np->local_ip, &(iph->saddr)); |
399 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
400 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
401 | ||
402 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 403 | skb_reset_mac_header(skb); |
206daaf7 | 404 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
405 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
406 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
407 | |
408 | skb->dev = np->dev; | |
409 | ||
410 | netpoll_send_skb(np, skb); | |
411 | } | |
9e34a5b5 | 412 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 LT |
413 | |
414 | static void arp_reply(struct sk_buff *skb) | |
415 | { | |
115c1d6e | 416 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
417 | struct arphdr *arp; |
418 | unsigned char *arp_ptr; | |
419 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 420 | __be32 sip, tip; |
47bbec02 | 421 | unsigned char *sha; |
1da177e4 | 422 | struct sk_buff *send_skb; |
508e14b4 DB |
423 | struct netpoll *np, *tmp; |
424 | unsigned long flags; | |
ae641949 | 425 | int hlen, tlen; |
508e14b4 DB |
426 | int hits = 0; |
427 | ||
428 | if (list_empty(&npinfo->rx_np)) | |
429 | return; | |
430 | ||
431 | /* Before checking the packet, we do some early | |
432 | inspection whether this is interesting at all */ | |
433 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
434 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
435 | if (np->dev == skb->dev) | |
436 | hits++; | |
437 | } | |
438 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 439 | |
508e14b4 DB |
440 | /* No netpoll struct is using this dev */ |
441 | if (!hits) | |
115c1d6e | 442 | return; |
1da177e4 LT |
443 | |
444 | /* No arp on this interface */ | |
445 | if (skb->dev->flags & IFF_NOARP) | |
446 | return; | |
447 | ||
988b7050 | 448 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
449 | return; |
450 | ||
c1d2bbe1 | 451 | skb_reset_network_header(skb); |
badff6d0 | 452 | skb_reset_transport_header(skb); |
d0a92be0 | 453 | arp = arp_hdr(skb); |
1da177e4 LT |
454 | |
455 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
456 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
457 | arp->ar_pro != htons(ETH_P_IP) || | |
458 | arp->ar_op != htons(ARPOP_REQUEST)) | |
459 | return; | |
460 | ||
47bbec02 NH |
461 | arp_ptr = (unsigned char *)(arp+1); |
462 | /* save the location of the src hw addr */ | |
463 | sha = arp_ptr; | |
464 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 465 | memcpy(&sip, arp_ptr, 4); |
47bbec02 | 466 | arp_ptr += 4; |
508e14b4 DB |
467 | /* If we actually cared about dst hw addr, |
468 | it would get copied here */ | |
47bbec02 | 469 | arp_ptr += skb->dev->addr_len; |
1da177e4 LT |
470 | memcpy(&tip, arp_ptr, 4); |
471 | ||
472 | /* Should we ignore arp? */ | |
508e14b4 | 473 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
474 | return; |
475 | ||
988b7050 | 476 | size = arp_hdr_len(skb->dev); |
1da177e4 | 477 | |
508e14b4 DB |
478 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
479 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
480 | if (tip != np->local_ip) | |
481 | continue; | |
1da177e4 | 482 | |
ae641949 HX |
483 | hlen = LL_RESERVED_SPACE(np->dev); |
484 | tlen = np->dev->needed_tailroom; | |
485 | send_skb = find_skb(np, size + hlen + tlen, hlen); | |
508e14b4 DB |
486 | if (!send_skb) |
487 | continue; | |
1da177e4 | 488 | |
508e14b4 DB |
489 | skb_reset_network_header(send_skb); |
490 | arp = (struct arphdr *) skb_put(send_skb, size); | |
491 | send_skb->dev = skb->dev; | |
492 | send_skb->protocol = htons(ETH_P_ARP); | |
1da177e4 | 493 | |
508e14b4 DB |
494 | /* Fill the device header for the ARP frame */ |
495 | if (dev_hard_header(send_skb, skb->dev, ptype, | |
496 | sha, np->dev->dev_addr, | |
497 | send_skb->len) < 0) { | |
498 | kfree_skb(send_skb); | |
499 | continue; | |
500 | } | |
1da177e4 | 501 | |
508e14b4 DB |
502 | /* |
503 | * Fill out the arp protocol part. | |
504 | * | |
505 | * we only support ethernet device type, | |
506 | * which (according to RFC 1390) should | |
507 | * always equal 1 (Ethernet). | |
508 | */ | |
1da177e4 | 509 | |
508e14b4 DB |
510 | arp->ar_hrd = htons(np->dev->type); |
511 | arp->ar_pro = htons(ETH_P_IP); | |
512 | arp->ar_hln = np->dev->addr_len; | |
513 | arp->ar_pln = 4; | |
514 | arp->ar_op = htons(type); | |
515 | ||
516 | arp_ptr = (unsigned char *)(arp + 1); | |
517 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
518 | arp_ptr += np->dev->addr_len; | |
519 | memcpy(arp_ptr, &tip, 4); | |
520 | arp_ptr += 4; | |
521 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
522 | arp_ptr += np->dev->addr_len; | |
523 | memcpy(arp_ptr, &sip, 4); | |
524 | ||
525 | netpoll_send_skb(np, send_skb); | |
526 | ||
527 | /* If there are several rx_hooks for the same address, | |
528 | we're fine by sending a single reply */ | |
529 | break; | |
530 | } | |
531 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 LT |
532 | } |
533 | ||
534 | int __netpoll_rx(struct sk_buff *skb) | |
535 | { | |
536 | int proto, len, ulen; | |
508e14b4 | 537 | int hits = 0; |
b71d1d42 | 538 | const struct iphdr *iph; |
1da177e4 | 539 | struct udphdr *uh; |
508e14b4 DB |
540 | struct netpoll_info *npinfo = skb->dev->npinfo; |
541 | struct netpoll *np, *tmp; | |
068c6e98 | 542 | |
508e14b4 | 543 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 544 | goto out; |
508e14b4 | 545 | |
1da177e4 LT |
546 | if (skb->dev->type != ARPHRD_ETHER) |
547 | goto out; | |
548 | ||
d9452e9f | 549 | /* check if netpoll clients need ARP */ |
724800d6 | 550 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 551 | atomic_read(&trapped)) { |
508e14b4 | 552 | skb_queue_tail(&npinfo->arp_tx, skb); |
1da177e4 LT |
553 | return 1; |
554 | } | |
555 | ||
556 | proto = ntohs(eth_hdr(skb)->h_proto); | |
557 | if (proto != ETH_P_IP) | |
558 | goto out; | |
559 | if (skb->pkt_type == PACKET_OTHERHOST) | |
560 | goto out; | |
561 | if (skb_shared(skb)) | |
562 | goto out; | |
563 | ||
1da177e4 LT |
564 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
565 | goto out; | |
e9278a47 | 566 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
567 | if (iph->ihl < 5 || iph->version != 4) |
568 | goto out; | |
569 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
570 | goto out; | |
e9278a47 | 571 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
572 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
573 | goto out; | |
574 | ||
575 | len = ntohs(iph->tot_len); | |
576 | if (skb->len < len || len < iph->ihl*4) | |
577 | goto out; | |
578 | ||
5e7d7fa5 AL |
579 | /* |
580 | * Our transport medium may have padded the buffer out. | |
581 | * Now We trim to the true length of the frame. | |
582 | */ | |
583 | if (pskb_trim_rcsum(skb, len)) | |
584 | goto out; | |
585 | ||
e9278a47 | 586 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
587 | if (iph->protocol != IPPROTO_UDP) |
588 | goto out; | |
589 | ||
590 | len -= iph->ihl*4; | |
591 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
592 | ulen = ntohs(uh->len); | |
593 | ||
594 | if (ulen != len) | |
595 | goto out; | |
fb286bb2 | 596 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 597 | goto out; |
1da177e4 | 598 | |
508e14b4 DB |
599 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
600 | if (np->local_ip && np->local_ip != iph->daddr) | |
601 | continue; | |
602 | if (np->remote_ip && np->remote_ip != iph->saddr) | |
603 | continue; | |
604 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
605 | continue; | |
606 | ||
607 | np->rx_hook(np, ntohs(uh->source), | |
608 | (char *)(uh+1), | |
609 | ulen - sizeof(struct udphdr)); | |
610 | hits++; | |
611 | } | |
612 | ||
613 | if (!hits) | |
614 | goto out; | |
1da177e4 LT |
615 | |
616 | kfree_skb(skb); | |
617 | return 1; | |
618 | ||
619 | out: | |
620 | if (atomic_read(&trapped)) { | |
621 | kfree_skb(skb); | |
622 | return 1; | |
623 | } | |
624 | ||
625 | return 0; | |
626 | } | |
627 | ||
0bcc1816 SS |
628 | void netpoll_print_options(struct netpoll *np) |
629 | { | |
630 | printk(KERN_INFO "%s: local port %d\n", | |
631 | np->name, np->local_port); | |
e7557af5 HH |
632 | printk(KERN_INFO "%s: local IP %pI4\n", |
633 | np->name, &np->local_ip); | |
5fc05f87 | 634 | printk(KERN_INFO "%s: interface '%s'\n", |
0bcc1816 SS |
635 | np->name, np->dev_name); |
636 | printk(KERN_INFO "%s: remote port %d\n", | |
637 | np->name, np->remote_port); | |
e7557af5 HH |
638 | printk(KERN_INFO "%s: remote IP %pI4\n", |
639 | np->name, &np->remote_ip); | |
e174961c JB |
640 | printk(KERN_INFO "%s: remote ethernet address %pM\n", |
641 | np->name, np->remote_mac); | |
0bcc1816 | 642 | } |
9e34a5b5 | 643 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 644 | |
1da177e4 LT |
645 | int netpoll_parse_options(struct netpoll *np, char *opt) |
646 | { | |
647 | char *cur=opt, *delim; | |
648 | ||
c68b9070 | 649 | if (*cur != '@') { |
1da177e4 LT |
650 | if ((delim = strchr(cur, '@')) == NULL) |
651 | goto parse_failed; | |
c68b9070 DM |
652 | *delim = 0; |
653 | np->local_port = simple_strtol(cur, NULL, 10); | |
654 | cur = delim; | |
1da177e4 LT |
655 | } |
656 | cur++; | |
1da177e4 | 657 | |
c68b9070 | 658 | if (*cur != '/') { |
1da177e4 LT |
659 | if ((delim = strchr(cur, '/')) == NULL) |
660 | goto parse_failed; | |
c68b9070 | 661 | *delim = 0; |
e7557af5 | 662 | np->local_ip = in_aton(cur); |
c68b9070 | 663 | cur = delim; |
1da177e4 LT |
664 | } |
665 | cur++; | |
666 | ||
c68b9070 | 667 | if (*cur != ',') { |
1da177e4 LT |
668 | /* parse out dev name */ |
669 | if ((delim = strchr(cur, ',')) == NULL) | |
670 | goto parse_failed; | |
c68b9070 | 671 | *delim = 0; |
1da177e4 | 672 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 673 | cur = delim; |
1da177e4 LT |
674 | } |
675 | cur++; | |
676 | ||
c68b9070 | 677 | if (*cur != '@') { |
1da177e4 LT |
678 | /* dst port */ |
679 | if ((delim = strchr(cur, '@')) == NULL) | |
680 | goto parse_failed; | |
c68b9070 | 681 | *delim = 0; |
5fc05f87 AW |
682 | if (*cur == ' ' || *cur == '\t') |
683 | printk(KERN_INFO "%s: warning: whitespace" | |
684 | "is not allowed\n", np->name); | |
c68b9070 DM |
685 | np->remote_port = simple_strtol(cur, NULL, 10); |
686 | cur = delim; | |
1da177e4 LT |
687 | } |
688 | cur++; | |
1da177e4 LT |
689 | |
690 | /* dst ip */ | |
691 | if ((delim = strchr(cur, '/')) == NULL) | |
692 | goto parse_failed; | |
c68b9070 | 693 | *delim = 0; |
e7557af5 | 694 | np->remote_ip = in_aton(cur); |
c68b9070 | 695 | cur = delim + 1; |
1da177e4 | 696 | |
c68b9070 | 697 | if (*cur != 0) { |
1da177e4 | 698 | /* MAC address */ |
4940fc88 | 699 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 700 | goto parse_failed; |
1da177e4 LT |
701 | } |
702 | ||
0bcc1816 | 703 | netpoll_print_options(np); |
1da177e4 LT |
704 | |
705 | return 0; | |
706 | ||
707 | parse_failed: | |
5fc05f87 | 708 | printk(KERN_INFO "%s: couldn't parse config at '%s'!\n", |
1da177e4 LT |
709 | np->name, cur); |
710 | return -1; | |
711 | } | |
9e34a5b5 | 712 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 713 | |
8fdd95ec | 714 | int __netpoll_setup(struct netpoll *np) |
1da177e4 | 715 | { |
8fdd95ec | 716 | struct net_device *ndev = np->dev; |
115c1d6e | 717 | struct netpoll_info *npinfo; |
4247e161 | 718 | const struct net_device_ops *ops; |
fbeec2e1 | 719 | unsigned long flags; |
b41848b6 | 720 | int err; |
1da177e4 | 721 | |
8fdd95ec HX |
722 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
723 | !ndev->netdev_ops->ndo_poll_controller) { | |
724 | printk(KERN_ERR "%s: %s doesn't support polling, aborting.\n", | |
725 | np->name, np->dev_name); | |
726 | err = -ENOTSUPP; | |
727 | goto out; | |
728 | } | |
729 | ||
730 | if (!ndev->npinfo) { | |
731 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
732 | if (!npinfo) { | |
733 | err = -ENOMEM; | |
734 | goto out; | |
735 | } | |
736 | ||
737 | npinfo->rx_flags = 0; | |
738 | INIT_LIST_HEAD(&npinfo->rx_np); | |
739 | ||
740 | spin_lock_init(&npinfo->rx_lock); | |
741 | skb_queue_head_init(&npinfo->arp_tx); | |
742 | skb_queue_head_init(&npinfo->txq); | |
743 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
744 | ||
745 | atomic_set(&npinfo->refcnt, 1); | |
746 | ||
747 | ops = np->dev->netdev_ops; | |
748 | if (ops->ndo_netpoll_setup) { | |
749 | err = ops->ndo_netpoll_setup(ndev, npinfo); | |
750 | if (err) | |
751 | goto free_npinfo; | |
752 | } | |
753 | } else { | |
754 | npinfo = ndev->npinfo; | |
755 | atomic_inc(&npinfo->refcnt); | |
756 | } | |
757 | ||
758 | npinfo->netpoll = np; | |
759 | ||
760 | if (np->rx_hook) { | |
761 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
762 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
763 | list_add_tail(&np->rx, &npinfo->rx_np); | |
764 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
765 | } | |
766 | ||
767 | /* last thing to do is link it to the net device structure */ | |
cf778b00 | 768 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
769 | |
770 | return 0; | |
771 | ||
772 | free_npinfo: | |
773 | kfree(npinfo); | |
774 | out: | |
775 | return err; | |
776 | } | |
777 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
778 | ||
779 | int netpoll_setup(struct netpoll *np) | |
780 | { | |
781 | struct net_device *ndev = NULL; | |
782 | struct in_device *in_dev; | |
783 | int err; | |
784 | ||
1da177e4 | 785 | if (np->dev_name) |
881d966b | 786 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 LT |
787 | if (!ndev) { |
788 | printk(KERN_ERR "%s: %s doesn't exist, aborting.\n", | |
789 | np->name, np->dev_name); | |
b41848b6 | 790 | return -ENODEV; |
1da177e4 LT |
791 | } |
792 | ||
0c1ad04a WC |
793 | if (ndev->master) { |
794 | printk(KERN_ERR "%s: %s is a slave device, aborting.\n", | |
795 | np->name, np->dev_name); | |
83fe32de DC |
796 | err = -EBUSY; |
797 | goto put; | |
0c1ad04a WC |
798 | } |
799 | ||
1da177e4 LT |
800 | if (!netif_running(ndev)) { |
801 | unsigned long atmost, atleast; | |
802 | ||
803 | printk(KERN_INFO "%s: device %s not up yet, forcing it\n", | |
804 | np->name, np->dev_name); | |
805 | ||
6756ae4b | 806 | rtnl_lock(); |
b41848b6 SH |
807 | err = dev_open(ndev); |
808 | rtnl_unlock(); | |
809 | ||
810 | if (err) { | |
1da177e4 | 811 | printk(KERN_ERR "%s: failed to open %s\n", |
b41848b6 | 812 | np->name, ndev->name); |
dbaa1541 | 813 | goto put; |
1da177e4 | 814 | } |
1da177e4 LT |
815 | |
816 | atleast = jiffies + HZ/10; | |
bff38771 | 817 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
818 | while (!netif_carrier_ok(ndev)) { |
819 | if (time_after(jiffies, atmost)) { | |
820 | printk(KERN_NOTICE | |
821 | "%s: timeout waiting for carrier\n", | |
822 | np->name); | |
823 | break; | |
824 | } | |
1b614fb9 | 825 | msleep(1); |
1da177e4 LT |
826 | } |
827 | ||
828 | /* If carrier appears to come up instantly, we don't | |
829 | * trust it and pause so that we don't pump all our | |
830 | * queued console messages into the bitbucket. | |
831 | */ | |
832 | ||
833 | if (time_before(jiffies, atleast)) { | |
834 | printk(KERN_NOTICE "%s: carrier detect appears" | |
835 | " untrustworthy, waiting 4 seconds\n", | |
836 | np->name); | |
837 | msleep(4000); | |
838 | } | |
839 | } | |
840 | ||
1da177e4 LT |
841 | if (!np->local_ip) { |
842 | rcu_read_lock(); | |
e5ed6399 | 843 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
844 | |
845 | if (!in_dev || !in_dev->ifa_list) { | |
846 | rcu_read_unlock(); | |
847 | printk(KERN_ERR "%s: no IP address for %s, aborting\n", | |
848 | np->name, np->dev_name); | |
b41848b6 | 849 | err = -EDESTADDRREQ; |
dbaa1541 | 850 | goto put; |
1da177e4 LT |
851 | } |
852 | ||
e7557af5 | 853 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 854 | rcu_read_unlock(); |
e7557af5 | 855 | printk(KERN_INFO "%s: local IP %pI4\n", np->name, &np->local_ip); |
1da177e4 LT |
856 | } |
857 | ||
dbaa1541 HX |
858 | np->dev = ndev; |
859 | ||
860 | /* fill up the skb queue */ | |
861 | refill_skbs(); | |
862 | ||
863 | rtnl_lock(); | |
8fdd95ec | 864 | err = __netpoll_setup(np); |
dbaa1541 | 865 | rtnl_unlock(); |
53fb95d3 | 866 | |
8fdd95ec HX |
867 | if (err) |
868 | goto put; | |
869 | ||
1da177e4 LT |
870 | return 0; |
871 | ||
21edbb22 | 872 | put: |
1da177e4 | 873 | dev_put(ndev); |
b41848b6 | 874 | return err; |
1da177e4 | 875 | } |
9e34a5b5 | 876 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 877 | |
c68b9070 DM |
878 | static int __init netpoll_init(void) |
879 | { | |
a1bcfacd SH |
880 | skb_queue_head_init(&skb_pool); |
881 | return 0; | |
882 | } | |
883 | core_initcall(netpoll_init); | |
884 | ||
8fdd95ec | 885 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 886 | { |
fbeec2e1 JM |
887 | struct netpoll_info *npinfo; |
888 | unsigned long flags; | |
889 | ||
8fdd95ec HX |
890 | npinfo = np->dev->npinfo; |
891 | if (!npinfo) | |
dbaa1541 | 892 | return; |
93ec2c72 | 893 | |
8fdd95ec HX |
894 | if (!list_empty(&npinfo->rx_np)) { |
895 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
896 | list_del(&np->rx); | |
897 | if (list_empty(&npinfo->rx_np)) | |
898 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
899 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
900 | } | |
de85d99e | 901 | |
8fdd95ec HX |
902 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
903 | const struct net_device_ops *ops; | |
de85d99e | 904 | |
8fdd95ec HX |
905 | ops = np->dev->netdev_ops; |
906 | if (ops->ndo_netpoll_cleanup) | |
907 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 908 | |
a9b3cd7f | 909 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
de85d99e | 910 | |
dbaa1541 HX |
911 | /* avoid racing with NAPI reading npinfo */ |
912 | synchronize_rcu_bh(); | |
93ec2c72 | 913 | |
dbaa1541 HX |
914 | skb_queue_purge(&npinfo->arp_tx); |
915 | skb_queue_purge(&npinfo->txq); | |
afe2c511 | 916 | cancel_delayed_work_sync(&npinfo->tx_work); |
93ec2c72 | 917 | |
dbaa1541 HX |
918 | /* clean after last, unfinished work */ |
919 | __skb_queue_purge(&npinfo->txq); | |
920 | kfree(npinfo); | |
115c1d6e | 921 | } |
8fdd95ec HX |
922 | } |
923 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
fbeec2e1 | 924 | |
8fdd95ec HX |
925 | void netpoll_cleanup(struct netpoll *np) |
926 | { | |
927 | if (!np->dev) | |
928 | return; | |
dbaa1541 | 929 | |
8fdd95ec HX |
930 | rtnl_lock(); |
931 | __netpoll_cleanup(np); | |
932 | rtnl_unlock(); | |
933 | ||
934 | dev_put(np->dev); | |
1da177e4 LT |
935 | np->dev = NULL; |
936 | } | |
9e34a5b5 | 937 | EXPORT_SYMBOL(netpoll_cleanup); |
1da177e4 LT |
938 | |
939 | int netpoll_trap(void) | |
940 | { | |
941 | return atomic_read(&trapped); | |
942 | } | |
9e34a5b5 | 943 | EXPORT_SYMBOL(netpoll_trap); |
1da177e4 LT |
944 | |
945 | void netpoll_set_trap(int trap) | |
946 | { | |
947 | if (trap) | |
948 | atomic_inc(&trapped); | |
949 | else | |
950 | atomic_dec(&trapped); | |
951 | } | |
1da177e4 | 952 | EXPORT_SYMBOL(netpoll_set_trap); |