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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 | ||
e6ec2693 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
bff38771 | 14 | #include <linux/moduleparam.h> |
1da177e4 LT |
15 | #include <linux/netdevice.h> |
16 | #include <linux/etherdevice.h> | |
17 | #include <linux/string.h> | |
14c85021 | 18 | #include <linux/if_arp.h> |
1da177e4 LT |
19 | #include <linux/inetdevice.h> |
20 | #include <linux/inet.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/netpoll.h> | |
23 | #include <linux/sched.h> | |
24 | #include <linux/delay.h> | |
25 | #include <linux/rcupdate.h> | |
26 | #include <linux/workqueue.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
bc3b2d7f | 28 | #include <linux/export.h> |
1da177e4 LT |
29 | #include <net/tcp.h> |
30 | #include <net/udp.h> | |
31 | #include <asm/unaligned.h> | |
9cbc1cb8 | 32 | #include <trace/events/napi.h> |
1da177e4 LT |
33 | |
34 | /* | |
35 | * We maintain a small pool of fully-sized skbs, to make sure the | |
36 | * message gets out even in extreme OOM situations. | |
37 | */ | |
38 | ||
39 | #define MAX_UDP_CHUNK 1460 | |
40 | #define MAX_SKBS 32 | |
1da177e4 | 41 | |
a1bcfacd | 42 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
43 | |
44 | static atomic_t trapped; | |
45 | ||
2bdfe0ba | 46 | #define USEC_PER_POLL 50 |
d9452e9f DM |
47 | #define NETPOLL_RX_ENABLED 1 |
48 | #define NETPOLL_RX_DROP 2 | |
1da177e4 LT |
49 | |
50 | #define MAX_SKB_SIZE \ | |
51 | (MAX_UDP_CHUNK + sizeof(struct udphdr) + \ | |
52 | sizeof(struct iphdr) + sizeof(struct ethhdr)) | |
53 | ||
3578b0c8 | 54 | static void zap_completion_queue(void); |
068c6e98 | 55 | static void arp_reply(struct sk_buff *skb); |
1da177e4 | 56 | |
bff38771 AV |
57 | static unsigned int carrier_timeout = 4; |
58 | module_param(carrier_timeout, uint, 0644); | |
59 | ||
e6ec2693 JP |
60 | #define np_info(np, fmt, ...) \ |
61 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
62 | #define np_err(np, fmt, ...) \ | |
63 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
64 | #define np_notice(np, fmt, ...) \ | |
65 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
66 | ||
c4028958 | 67 | static void queue_process(struct work_struct *work) |
1da177e4 | 68 | { |
4c1ac1b4 DH |
69 | struct netpoll_info *npinfo = |
70 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 71 | struct sk_buff *skb; |
3640543d | 72 | unsigned long flags; |
1da177e4 | 73 | |
6c43ff18 SH |
74 | while ((skb = skb_dequeue(&npinfo->txq))) { |
75 | struct net_device *dev = skb->dev; | |
00829823 | 76 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 77 | struct netdev_queue *txq; |
1da177e4 | 78 | |
6c43ff18 SH |
79 | if (!netif_device_present(dev) || !netif_running(dev)) { |
80 | __kfree_skb(skb); | |
81 | continue; | |
82 | } | |
1da177e4 | 83 | |
fd2ea0a7 DM |
84 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
85 | ||
3640543d | 86 | local_irq_save(flags); |
fd2ea0a7 | 87 | __netif_tx_lock(txq, smp_processor_id()); |
73466498 | 88 | if (netif_xmit_frozen_or_stopped(txq) || |
00829823 | 89 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 90 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 91 | __netif_tx_unlock(txq); |
3640543d | 92 | local_irq_restore(flags); |
1da177e4 | 93 | |
25442caf | 94 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
95 | return; |
96 | } | |
fd2ea0a7 | 97 | __netif_tx_unlock(txq); |
3640543d | 98 | local_irq_restore(flags); |
1da177e4 | 99 | } |
1da177e4 LT |
100 | } |
101 | ||
b51655b9 AV |
102 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
103 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 104 | { |
d6f5493c | 105 | __wsum psum; |
fb286bb2 | 106 | |
60476372 | 107 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
108 | return 0; |
109 | ||
fb286bb2 HX |
110 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
111 | ||
84fa7933 | 112 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 113 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 114 | return 0; |
1da177e4 | 115 | |
fb286bb2 | 116 | skb->csum = psum; |
1da177e4 | 117 | |
fb286bb2 | 118 | return __skb_checksum_complete(skb); |
1da177e4 LT |
119 | } |
120 | ||
121 | /* | |
122 | * Check whether delayed processing was scheduled for our NIC. If so, | |
123 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
124 | * If this fails, either we've recursed in ->poll() or it's already | |
125 | * running on another CPU. | |
126 | * | |
127 | * Note: we don't mask interrupts with this lock because we're using | |
128 | * trylock here and interrupts are already disabled in the softirq | |
129 | * case. Further, we test the poll_owner to avoid recursion on UP | |
130 | * systems where the lock doesn't exist. | |
131 | * | |
132 | * In cases where there is bi-directional communications, reading only | |
133 | * one message at a time can lead to packets being dropped by the | |
134 | * network adapter, forcing superfluous retries and possibly timeouts. | |
135 | * Thus, we set our budget to greater than 1. | |
136 | */ | |
0a7606c1 DM |
137 | static int poll_one_napi(struct netpoll_info *npinfo, |
138 | struct napi_struct *napi, int budget) | |
139 | { | |
140 | int work; | |
141 | ||
142 | /* net_rx_action's ->poll() invocations and our's are | |
143 | * synchronized by this test which is only made while | |
144 | * holding the napi->poll_lock. | |
145 | */ | |
146 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
147 | return budget; | |
148 | ||
d9452e9f | 149 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 150 | atomic_inc(&trapped); |
7b363e44 | 151 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
152 | |
153 | work = napi->poll(napi, budget); | |
7d18f114 | 154 | trace_napi_poll(napi); |
0a7606c1 | 155 | |
7b363e44 | 156 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 157 | atomic_dec(&trapped); |
d9452e9f | 158 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
159 | |
160 | return budget - work; | |
161 | } | |
162 | ||
5106930b | 163 | static void poll_napi(struct net_device *dev) |
1da177e4 | 164 | { |
bea3348e | 165 | struct napi_struct *napi; |
1da177e4 LT |
166 | int budget = 16; |
167 | ||
f13d493d | 168 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 169 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 170 | spin_trylock(&napi->poll_lock)) { |
5106930b | 171 | budget = poll_one_napi(dev->npinfo, napi, budget); |
bea3348e | 172 | spin_unlock(&napi->poll_lock); |
0a7606c1 DM |
173 | |
174 | if (!budget) | |
175 | break; | |
bea3348e | 176 | } |
1da177e4 LT |
177 | } |
178 | } | |
179 | ||
068c6e98 NH |
180 | static void service_arp_queue(struct netpoll_info *npi) |
181 | { | |
5106930b SH |
182 | if (npi) { |
183 | struct sk_buff *skb; | |
068c6e98 | 184 | |
5106930b SH |
185 | while ((skb = skb_dequeue(&npi->arp_tx))) |
186 | arp_reply(skb); | |
068c6e98 | 187 | } |
068c6e98 NH |
188 | } |
189 | ||
234b921d | 190 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 191 | { |
5e392739 | 192 | const struct net_device_ops *ops; |
5106930b | 193 | |
5e392739 PE |
194 | if (!dev || !netif_running(dev)) |
195 | return; | |
196 | ||
197 | ops = dev->netdev_ops; | |
198 | if (!ops->ndo_poll_controller) | |
1da177e4 LT |
199 | return; |
200 | ||
201 | /* Process pending work on NIC */ | |
d314774c | 202 | ops->ndo_poll_controller(dev); |
5106930b SH |
203 | |
204 | poll_napi(dev); | |
1da177e4 | 205 | |
5a698af5 AW |
206 | if (dev->priv_flags & IFF_SLAVE) { |
207 | if (dev->npinfo) { | |
208 | struct net_device *bond_dev = dev->master; | |
209 | struct sk_buff *skb; | |
210 | while ((skb = skb_dequeue(&dev->npinfo->arp_tx))) { | |
211 | skb->dev = bond_dev; | |
212 | skb_queue_tail(&bond_dev->npinfo->arp_tx, skb); | |
213 | } | |
214 | } | |
215 | } | |
216 | ||
5106930b | 217 | service_arp_queue(dev->npinfo); |
068c6e98 | 218 | |
3578b0c8 | 219 | zap_completion_queue(); |
1da177e4 LT |
220 | } |
221 | ||
222 | static void refill_skbs(void) | |
223 | { | |
224 | struct sk_buff *skb; | |
225 | unsigned long flags; | |
226 | ||
a1bcfacd SH |
227 | spin_lock_irqsave(&skb_pool.lock, flags); |
228 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
229 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
230 | if (!skb) | |
231 | break; | |
232 | ||
a1bcfacd | 233 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 234 | } |
a1bcfacd | 235 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
236 | } |
237 | ||
3578b0c8 DM |
238 | static void zap_completion_queue(void) |
239 | { | |
240 | unsigned long flags; | |
241 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
242 | ||
243 | if (sd->completion_queue) { | |
244 | struct sk_buff *clist; | |
245 | ||
246 | local_irq_save(flags); | |
247 | clist = sd->completion_queue; | |
248 | sd->completion_queue = NULL; | |
249 | local_irq_restore(flags); | |
250 | ||
251 | while (clist != NULL) { | |
252 | struct sk_buff *skb = clist; | |
253 | clist = clist->next; | |
254 | if (skb->destructor) { | |
255 | atomic_inc(&skb->users); | |
256 | dev_kfree_skb_any(skb); /* put this one back */ | |
257 | } else { | |
258 | __kfree_skb(skb); | |
259 | } | |
260 | } | |
261 | } | |
262 | ||
263 | put_cpu_var(softnet_data); | |
264 | } | |
265 | ||
a1bcfacd | 266 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 267 | { |
a1bcfacd SH |
268 | int count = 0; |
269 | struct sk_buff *skb; | |
1da177e4 | 270 | |
3578b0c8 | 271 | zap_completion_queue(); |
a1bcfacd | 272 | refill_skbs(); |
1da177e4 | 273 | repeat: |
1da177e4 LT |
274 | |
275 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
276 | if (!skb) |
277 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
278 | |
279 | if (!skb) { | |
a1bcfacd | 280 | if (++count < 10) { |
2a49e001 | 281 | netpoll_poll_dev(np->dev); |
a1bcfacd | 282 | goto repeat; |
1da177e4 | 283 | } |
a1bcfacd | 284 | return NULL; |
1da177e4 LT |
285 | } |
286 | ||
287 | atomic_set(&skb->users, 1); | |
288 | skb_reserve(skb, reserve); | |
289 | return skb; | |
290 | } | |
291 | ||
bea3348e SH |
292 | static int netpoll_owner_active(struct net_device *dev) |
293 | { | |
294 | struct napi_struct *napi; | |
295 | ||
296 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
297 | if (napi->poll_owner == smp_processor_id()) | |
298 | return 1; | |
299 | } | |
300 | return 0; | |
301 | } | |
302 | ||
c2355e1a NH |
303 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
304 | struct net_device *dev) | |
1da177e4 | 305 | { |
2bdfe0ba SH |
306 | int status = NETDEV_TX_BUSY; |
307 | unsigned long tries; | |
00829823 | 308 | const struct net_device_ops *ops = dev->netdev_ops; |
de85d99e | 309 | /* It is up to the caller to keep npinfo alive. */ |
4ec93edb | 310 | struct netpoll_info *npinfo = np->dev->npinfo; |
2bdfe0ba | 311 | |
4ec93edb YH |
312 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
313 | __kfree_skb(skb); | |
314 | return; | |
315 | } | |
2bdfe0ba SH |
316 | |
317 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 318 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 319 | struct netdev_queue *txq; |
a49f99ff AM |
320 | unsigned long flags; |
321 | ||
fd2ea0a7 DM |
322 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
323 | ||
a49f99ff | 324 | local_irq_save(flags); |
0db3dc73 SH |
325 | /* try until next clock tick */ |
326 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
327 | tries > 0; --tries) { | |
fd2ea0a7 | 328 | if (__netif_tx_trylock(txq)) { |
73466498 | 329 | if (!netif_xmit_stopped(txq)) { |
00829823 | 330 | status = ops->ndo_start_xmit(skb, dev); |
08baf561 ED |
331 | if (status == NETDEV_TX_OK) |
332 | txq_trans_update(txq); | |
333 | } | |
fd2ea0a7 | 334 | __netif_tx_unlock(txq); |
e37b8d93 AM |
335 | |
336 | if (status == NETDEV_TX_OK) | |
337 | break; | |
338 | ||
e37b8d93 | 339 | } |
0db3dc73 SH |
340 | |
341 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 342 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
343 | |
344 | udelay(USEC_PER_POLL); | |
0db1d6fc | 345 | } |
79b1bee8 DD |
346 | |
347 | WARN_ONCE(!irqs_disabled(), | |
348 | "netpoll_send_skb(): %s enabled interrupts in poll (%pF)\n", | |
349 | dev->name, ops->ndo_start_xmit); | |
350 | ||
a49f99ff | 351 | local_irq_restore(flags); |
1da177e4 | 352 | } |
1da177e4 | 353 | |
2bdfe0ba | 354 | if (status != NETDEV_TX_OK) { |
5de4a473 | 355 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 356 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 357 | } |
1da177e4 | 358 | } |
c2355e1a | 359 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
360 | |
361 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
362 | { | |
363 | int total_len, eth_len, ip_len, udp_len; | |
364 | struct sk_buff *skb; | |
365 | struct udphdr *udph; | |
366 | struct iphdr *iph; | |
367 | struct ethhdr *eth; | |
368 | ||
369 | udp_len = len + sizeof(*udph); | |
370 | ip_len = eth_len = udp_len + sizeof(*iph); | |
371 | total_len = eth_len + ETH_HLEN + NET_IP_ALIGN; | |
372 | ||
373 | skb = find_skb(np, total_len, total_len - len); | |
374 | if (!skb) | |
375 | return; | |
376 | ||
27d7ff46 | 377 | skb_copy_to_linear_data(skb, msg, len); |
1da177e4 LT |
378 | skb->len += len; |
379 | ||
4bedb452 ACM |
380 | skb_push(skb, sizeof(*udph)); |
381 | skb_reset_transport_header(skb); | |
382 | udph = udp_hdr(skb); | |
1da177e4 LT |
383 | udph->source = htons(np->local_port); |
384 | udph->dest = htons(np->remote_port); | |
385 | udph->len = htons(udp_len); | |
386 | udph->check = 0; | |
e7557af5 HH |
387 | udph->check = csum_tcpudp_magic(np->local_ip, |
388 | np->remote_ip, | |
8e365eec | 389 | udp_len, IPPROTO_UDP, |
07f0757a | 390 | csum_partial(udph, udp_len, 0)); |
8e365eec | 391 | if (udph->check == 0) |
5e57dff2 | 392 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 393 | |
e2d1bca7 ACM |
394 | skb_push(skb, sizeof(*iph)); |
395 | skb_reset_network_header(skb); | |
eddc9ec5 | 396 | iph = ip_hdr(skb); |
1da177e4 LT |
397 | |
398 | /* iph->version = 4; iph->ihl = 5; */ | |
399 | put_unaligned(0x45, (unsigned char *)iph); | |
400 | iph->tos = 0; | |
401 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
402 | iph->id = 0; | |
403 | iph->frag_off = 0; | |
404 | iph->ttl = 64; | |
405 | iph->protocol = IPPROTO_UDP; | |
406 | iph->check = 0; | |
e7557af5 HH |
407 | put_unaligned(np->local_ip, &(iph->saddr)); |
408 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
409 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
410 | ||
411 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 412 | skb_reset_mac_header(skb); |
206daaf7 | 413 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
414 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
415 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
416 | |
417 | skb->dev = np->dev; | |
418 | ||
419 | netpoll_send_skb(np, skb); | |
420 | } | |
9e34a5b5 | 421 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 LT |
422 | |
423 | static void arp_reply(struct sk_buff *skb) | |
424 | { | |
115c1d6e | 425 | struct netpoll_info *npinfo = skb->dev->npinfo; |
1da177e4 LT |
426 | struct arphdr *arp; |
427 | unsigned char *arp_ptr; | |
428 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 429 | __be32 sip, tip; |
47bbec02 | 430 | unsigned char *sha; |
1da177e4 | 431 | struct sk_buff *send_skb; |
508e14b4 DB |
432 | struct netpoll *np, *tmp; |
433 | unsigned long flags; | |
ae641949 | 434 | int hlen, tlen; |
508e14b4 DB |
435 | int hits = 0; |
436 | ||
437 | if (list_empty(&npinfo->rx_np)) | |
438 | return; | |
439 | ||
440 | /* Before checking the packet, we do some early | |
441 | inspection whether this is interesting at all */ | |
442 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
443 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
444 | if (np->dev == skb->dev) | |
445 | hits++; | |
446 | } | |
447 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 448 | |
508e14b4 DB |
449 | /* No netpoll struct is using this dev */ |
450 | if (!hits) | |
115c1d6e | 451 | return; |
1da177e4 LT |
452 | |
453 | /* No arp on this interface */ | |
454 | if (skb->dev->flags & IFF_NOARP) | |
455 | return; | |
456 | ||
988b7050 | 457 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
458 | return; |
459 | ||
c1d2bbe1 | 460 | skb_reset_network_header(skb); |
badff6d0 | 461 | skb_reset_transport_header(skb); |
d0a92be0 | 462 | arp = arp_hdr(skb); |
1da177e4 LT |
463 | |
464 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
465 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
466 | arp->ar_pro != htons(ETH_P_IP) || | |
467 | arp->ar_op != htons(ARPOP_REQUEST)) | |
468 | return; | |
469 | ||
47bbec02 NH |
470 | arp_ptr = (unsigned char *)(arp+1); |
471 | /* save the location of the src hw addr */ | |
472 | sha = arp_ptr; | |
473 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 474 | memcpy(&sip, arp_ptr, 4); |
47bbec02 | 475 | arp_ptr += 4; |
508e14b4 DB |
476 | /* If we actually cared about dst hw addr, |
477 | it would get copied here */ | |
47bbec02 | 478 | arp_ptr += skb->dev->addr_len; |
1da177e4 LT |
479 | memcpy(&tip, arp_ptr, 4); |
480 | ||
481 | /* Should we ignore arp? */ | |
508e14b4 | 482 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
483 | return; |
484 | ||
988b7050 | 485 | size = arp_hdr_len(skb->dev); |
1da177e4 | 486 | |
508e14b4 DB |
487 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
488 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
489 | if (tip != np->local_ip) | |
490 | continue; | |
1da177e4 | 491 | |
ae641949 HX |
492 | hlen = LL_RESERVED_SPACE(np->dev); |
493 | tlen = np->dev->needed_tailroom; | |
494 | send_skb = find_skb(np, size + hlen + tlen, hlen); | |
508e14b4 DB |
495 | if (!send_skb) |
496 | continue; | |
1da177e4 | 497 | |
508e14b4 DB |
498 | skb_reset_network_header(send_skb); |
499 | arp = (struct arphdr *) skb_put(send_skb, size); | |
500 | send_skb->dev = skb->dev; | |
501 | send_skb->protocol = htons(ETH_P_ARP); | |
1da177e4 | 502 | |
508e14b4 DB |
503 | /* Fill the device header for the ARP frame */ |
504 | if (dev_hard_header(send_skb, skb->dev, ptype, | |
505 | sha, np->dev->dev_addr, | |
506 | send_skb->len) < 0) { | |
507 | kfree_skb(send_skb); | |
508 | continue; | |
509 | } | |
1da177e4 | 510 | |
508e14b4 DB |
511 | /* |
512 | * Fill out the arp protocol part. | |
513 | * | |
514 | * we only support ethernet device type, | |
515 | * which (according to RFC 1390) should | |
516 | * always equal 1 (Ethernet). | |
517 | */ | |
1da177e4 | 518 | |
508e14b4 DB |
519 | arp->ar_hrd = htons(np->dev->type); |
520 | arp->ar_pro = htons(ETH_P_IP); | |
521 | arp->ar_hln = np->dev->addr_len; | |
522 | arp->ar_pln = 4; | |
523 | arp->ar_op = htons(type); | |
524 | ||
525 | arp_ptr = (unsigned char *)(arp + 1); | |
526 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
527 | arp_ptr += np->dev->addr_len; | |
528 | memcpy(arp_ptr, &tip, 4); | |
529 | arp_ptr += 4; | |
530 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
531 | arp_ptr += np->dev->addr_len; | |
532 | memcpy(arp_ptr, &sip, 4); | |
533 | ||
534 | netpoll_send_skb(np, send_skb); | |
535 | ||
536 | /* If there are several rx_hooks for the same address, | |
537 | we're fine by sending a single reply */ | |
538 | break; | |
539 | } | |
540 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 LT |
541 | } |
542 | ||
543 | int __netpoll_rx(struct sk_buff *skb) | |
544 | { | |
545 | int proto, len, ulen; | |
508e14b4 | 546 | int hits = 0; |
b71d1d42 | 547 | const struct iphdr *iph; |
1da177e4 | 548 | struct udphdr *uh; |
508e14b4 DB |
549 | struct netpoll_info *npinfo = skb->dev->npinfo; |
550 | struct netpoll *np, *tmp; | |
068c6e98 | 551 | |
508e14b4 | 552 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 553 | goto out; |
508e14b4 | 554 | |
1da177e4 LT |
555 | if (skb->dev->type != ARPHRD_ETHER) |
556 | goto out; | |
557 | ||
d9452e9f | 558 | /* check if netpoll clients need ARP */ |
724800d6 | 559 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 560 | atomic_read(&trapped)) { |
508e14b4 | 561 | skb_queue_tail(&npinfo->arp_tx, skb); |
1da177e4 LT |
562 | return 1; |
563 | } | |
564 | ||
565 | proto = ntohs(eth_hdr(skb)->h_proto); | |
566 | if (proto != ETH_P_IP) | |
567 | goto out; | |
568 | if (skb->pkt_type == PACKET_OTHERHOST) | |
569 | goto out; | |
570 | if (skb_shared(skb)) | |
571 | goto out; | |
572 | ||
1da177e4 LT |
573 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
574 | goto out; | |
e9278a47 | 575 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
576 | if (iph->ihl < 5 || iph->version != 4) |
577 | goto out; | |
578 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
579 | goto out; | |
e9278a47 | 580 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
581 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
582 | goto out; | |
583 | ||
584 | len = ntohs(iph->tot_len); | |
585 | if (skb->len < len || len < iph->ihl*4) | |
586 | goto out; | |
587 | ||
5e7d7fa5 AL |
588 | /* |
589 | * Our transport medium may have padded the buffer out. | |
590 | * Now We trim to the true length of the frame. | |
591 | */ | |
592 | if (pskb_trim_rcsum(skb, len)) | |
593 | goto out; | |
594 | ||
e9278a47 | 595 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
596 | if (iph->protocol != IPPROTO_UDP) |
597 | goto out; | |
598 | ||
599 | len -= iph->ihl*4; | |
600 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
601 | ulen = ntohs(uh->len); | |
602 | ||
603 | if (ulen != len) | |
604 | goto out; | |
fb286bb2 | 605 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 606 | goto out; |
1da177e4 | 607 | |
508e14b4 DB |
608 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
609 | if (np->local_ip && np->local_ip != iph->daddr) | |
610 | continue; | |
611 | if (np->remote_ip && np->remote_ip != iph->saddr) | |
612 | continue; | |
613 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
614 | continue; | |
615 | ||
616 | np->rx_hook(np, ntohs(uh->source), | |
617 | (char *)(uh+1), | |
618 | ulen - sizeof(struct udphdr)); | |
619 | hits++; | |
620 | } | |
621 | ||
622 | if (!hits) | |
623 | goto out; | |
1da177e4 LT |
624 | |
625 | kfree_skb(skb); | |
626 | return 1; | |
627 | ||
628 | out: | |
629 | if (atomic_read(&trapped)) { | |
630 | kfree_skb(skb); | |
631 | return 1; | |
632 | } | |
633 | ||
634 | return 0; | |
635 | } | |
636 | ||
0bcc1816 SS |
637 | void netpoll_print_options(struct netpoll *np) |
638 | { | |
e6ec2693 JP |
639 | np_info(np, "local port %d\n", np->local_port); |
640 | np_info(np, "local IP %pI4\n", &np->local_ip); | |
641 | np_info(np, "interface '%s'\n", np->dev_name); | |
642 | np_info(np, "remote port %d\n", np->remote_port); | |
643 | np_info(np, "remote IP %pI4\n", &np->remote_ip); | |
644 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); | |
0bcc1816 | 645 | } |
9e34a5b5 | 646 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 647 | |
1da177e4 LT |
648 | int netpoll_parse_options(struct netpoll *np, char *opt) |
649 | { | |
650 | char *cur=opt, *delim; | |
651 | ||
c68b9070 | 652 | if (*cur != '@') { |
1da177e4 LT |
653 | if ((delim = strchr(cur, '@')) == NULL) |
654 | goto parse_failed; | |
c68b9070 DM |
655 | *delim = 0; |
656 | np->local_port = simple_strtol(cur, NULL, 10); | |
657 | cur = delim; | |
1da177e4 LT |
658 | } |
659 | cur++; | |
1da177e4 | 660 | |
c68b9070 | 661 | if (*cur != '/') { |
1da177e4 LT |
662 | if ((delim = strchr(cur, '/')) == NULL) |
663 | goto parse_failed; | |
c68b9070 | 664 | *delim = 0; |
e7557af5 | 665 | np->local_ip = in_aton(cur); |
c68b9070 | 666 | cur = delim; |
1da177e4 LT |
667 | } |
668 | cur++; | |
669 | ||
c68b9070 | 670 | if (*cur != ',') { |
1da177e4 LT |
671 | /* parse out dev name */ |
672 | if ((delim = strchr(cur, ',')) == NULL) | |
673 | goto parse_failed; | |
c68b9070 | 674 | *delim = 0; |
1da177e4 | 675 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 676 | cur = delim; |
1da177e4 LT |
677 | } |
678 | cur++; | |
679 | ||
c68b9070 | 680 | if (*cur != '@') { |
1da177e4 LT |
681 | /* dst port */ |
682 | if ((delim = strchr(cur, '@')) == NULL) | |
683 | goto parse_failed; | |
c68b9070 | 684 | *delim = 0; |
5fc05f87 | 685 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 686 | np_info(np, "warning: whitespace is not allowed\n"); |
c68b9070 DM |
687 | np->remote_port = simple_strtol(cur, NULL, 10); |
688 | cur = delim; | |
1da177e4 LT |
689 | } |
690 | cur++; | |
1da177e4 LT |
691 | |
692 | /* dst ip */ | |
693 | if ((delim = strchr(cur, '/')) == NULL) | |
694 | goto parse_failed; | |
c68b9070 | 695 | *delim = 0; |
e7557af5 | 696 | np->remote_ip = in_aton(cur); |
c68b9070 | 697 | cur = delim + 1; |
1da177e4 | 698 | |
c68b9070 | 699 | if (*cur != 0) { |
1da177e4 | 700 | /* MAC address */ |
4940fc88 | 701 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 702 | goto parse_failed; |
1da177e4 LT |
703 | } |
704 | ||
0bcc1816 | 705 | netpoll_print_options(np); |
1da177e4 LT |
706 | |
707 | return 0; | |
708 | ||
709 | parse_failed: | |
e6ec2693 | 710 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
711 | return -1; |
712 | } | |
9e34a5b5 | 713 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 714 | |
8fdd95ec | 715 | int __netpoll_setup(struct netpoll *np) |
1da177e4 | 716 | { |
8fdd95ec | 717 | struct net_device *ndev = np->dev; |
115c1d6e | 718 | struct netpoll_info *npinfo; |
4247e161 | 719 | const struct net_device_ops *ops; |
fbeec2e1 | 720 | unsigned long flags; |
b41848b6 | 721 | int err; |
1da177e4 | 722 | |
8fdd95ec HX |
723 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
724 | !ndev->netdev_ops->ndo_poll_controller) { | |
e6ec2693 JP |
725 | np_err(np, "%s doesn't support polling, aborting\n", |
726 | np->dev_name); | |
8fdd95ec HX |
727 | err = -ENOTSUPP; |
728 | goto out; | |
729 | } | |
730 | ||
731 | if (!ndev->npinfo) { | |
732 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); | |
733 | if (!npinfo) { | |
734 | err = -ENOMEM; | |
735 | goto out; | |
736 | } | |
737 | ||
738 | npinfo->rx_flags = 0; | |
739 | INIT_LIST_HEAD(&npinfo->rx_np); | |
740 | ||
741 | spin_lock_init(&npinfo->rx_lock); | |
742 | skb_queue_head_init(&npinfo->arp_tx); | |
743 | skb_queue_head_init(&npinfo->txq); | |
744 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
745 | ||
746 | atomic_set(&npinfo->refcnt, 1); | |
747 | ||
748 | ops = np->dev->netdev_ops; | |
749 | if (ops->ndo_netpoll_setup) { | |
750 | err = ops->ndo_netpoll_setup(ndev, npinfo); | |
751 | if (err) | |
752 | goto free_npinfo; | |
753 | } | |
754 | } else { | |
755 | npinfo = ndev->npinfo; | |
756 | atomic_inc(&npinfo->refcnt); | |
757 | } | |
758 | ||
759 | npinfo->netpoll = np; | |
760 | ||
761 | if (np->rx_hook) { | |
762 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
763 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
764 | list_add_tail(&np->rx, &npinfo->rx_np); | |
765 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
766 | } | |
767 | ||
768 | /* last thing to do is link it to the net device structure */ | |
cf778b00 | 769 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
770 | |
771 | return 0; | |
772 | ||
773 | free_npinfo: | |
774 | kfree(npinfo); | |
775 | out: | |
776 | return err; | |
777 | } | |
778 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
779 | ||
780 | int netpoll_setup(struct netpoll *np) | |
781 | { | |
782 | struct net_device *ndev = NULL; | |
783 | struct in_device *in_dev; | |
784 | int err; | |
785 | ||
1da177e4 | 786 | if (np->dev_name) |
881d966b | 787 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 | 788 | if (!ndev) { |
e6ec2693 | 789 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
b41848b6 | 790 | return -ENODEV; |
1da177e4 LT |
791 | } |
792 | ||
0c1ad04a | 793 | if (ndev->master) { |
e6ec2693 | 794 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
795 | err = -EBUSY; |
796 | goto put; | |
0c1ad04a WC |
797 | } |
798 | ||
1da177e4 LT |
799 | if (!netif_running(ndev)) { |
800 | unsigned long atmost, atleast; | |
801 | ||
e6ec2693 | 802 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 803 | |
6756ae4b | 804 | rtnl_lock(); |
b41848b6 SH |
805 | err = dev_open(ndev); |
806 | rtnl_unlock(); | |
807 | ||
808 | if (err) { | |
e6ec2693 | 809 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 810 | goto put; |
1da177e4 | 811 | } |
1da177e4 LT |
812 | |
813 | atleast = jiffies + HZ/10; | |
bff38771 | 814 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
815 | while (!netif_carrier_ok(ndev)) { |
816 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 817 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
818 | break; |
819 | } | |
1b614fb9 | 820 | msleep(1); |
1da177e4 LT |
821 | } |
822 | ||
823 | /* If carrier appears to come up instantly, we don't | |
824 | * trust it and pause so that we don't pump all our | |
825 | * queued console messages into the bitbucket. | |
826 | */ | |
827 | ||
828 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 829 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
830 | msleep(4000); |
831 | } | |
832 | } | |
833 | ||
1da177e4 LT |
834 | if (!np->local_ip) { |
835 | rcu_read_lock(); | |
e5ed6399 | 836 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
837 | |
838 | if (!in_dev || !in_dev->ifa_list) { | |
839 | rcu_read_unlock(); | |
e6ec2693 JP |
840 | np_err(np, "no IP address for %s, aborting\n", |
841 | np->dev_name); | |
b41848b6 | 842 | err = -EDESTADDRREQ; |
dbaa1541 | 843 | goto put; |
1da177e4 LT |
844 | } |
845 | ||
e7557af5 | 846 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 847 | rcu_read_unlock(); |
e6ec2693 | 848 | np_info(np, "local IP %pI4\n", &np->local_ip); |
1da177e4 LT |
849 | } |
850 | ||
dbaa1541 HX |
851 | np->dev = ndev; |
852 | ||
853 | /* fill up the skb queue */ | |
854 | refill_skbs(); | |
855 | ||
856 | rtnl_lock(); | |
8fdd95ec | 857 | err = __netpoll_setup(np); |
dbaa1541 | 858 | rtnl_unlock(); |
53fb95d3 | 859 | |
8fdd95ec HX |
860 | if (err) |
861 | goto put; | |
862 | ||
1da177e4 LT |
863 | return 0; |
864 | ||
21edbb22 | 865 | put: |
1da177e4 | 866 | dev_put(ndev); |
b41848b6 | 867 | return err; |
1da177e4 | 868 | } |
9e34a5b5 | 869 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 870 | |
c68b9070 DM |
871 | static int __init netpoll_init(void) |
872 | { | |
a1bcfacd SH |
873 | skb_queue_head_init(&skb_pool); |
874 | return 0; | |
875 | } | |
876 | core_initcall(netpoll_init); | |
877 | ||
8fdd95ec | 878 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 879 | { |
fbeec2e1 JM |
880 | struct netpoll_info *npinfo; |
881 | unsigned long flags; | |
882 | ||
8fdd95ec HX |
883 | npinfo = np->dev->npinfo; |
884 | if (!npinfo) | |
dbaa1541 | 885 | return; |
93ec2c72 | 886 | |
8fdd95ec HX |
887 | if (!list_empty(&npinfo->rx_np)) { |
888 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
889 | list_del(&np->rx); | |
890 | if (list_empty(&npinfo->rx_np)) | |
891 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
892 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
893 | } | |
de85d99e | 894 | |
8fdd95ec HX |
895 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
896 | const struct net_device_ops *ops; | |
de85d99e | 897 | |
8fdd95ec HX |
898 | ops = np->dev->netdev_ops; |
899 | if (ops->ndo_netpoll_cleanup) | |
900 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 901 | |
a9b3cd7f | 902 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
de85d99e | 903 | |
dbaa1541 HX |
904 | /* avoid racing with NAPI reading npinfo */ |
905 | synchronize_rcu_bh(); | |
93ec2c72 | 906 | |
dbaa1541 HX |
907 | skb_queue_purge(&npinfo->arp_tx); |
908 | skb_queue_purge(&npinfo->txq); | |
afe2c511 | 909 | cancel_delayed_work_sync(&npinfo->tx_work); |
93ec2c72 | 910 | |
dbaa1541 HX |
911 | /* clean after last, unfinished work */ |
912 | __skb_queue_purge(&npinfo->txq); | |
913 | kfree(npinfo); | |
115c1d6e | 914 | } |
8fdd95ec HX |
915 | } |
916 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
fbeec2e1 | 917 | |
8fdd95ec HX |
918 | void netpoll_cleanup(struct netpoll *np) |
919 | { | |
920 | if (!np->dev) | |
921 | return; | |
dbaa1541 | 922 | |
8fdd95ec HX |
923 | rtnl_lock(); |
924 | __netpoll_cleanup(np); | |
925 | rtnl_unlock(); | |
926 | ||
927 | dev_put(np->dev); | |
1da177e4 LT |
928 | np->dev = NULL; |
929 | } | |
9e34a5b5 | 930 | EXPORT_SYMBOL(netpoll_cleanup); |
1da177e4 LT |
931 | |
932 | int netpoll_trap(void) | |
933 | { | |
934 | return atomic_read(&trapped); | |
935 | } | |
9e34a5b5 | 936 | EXPORT_SYMBOL(netpoll_trap); |
1da177e4 LT |
937 | |
938 | void netpoll_set_trap(int trap) | |
939 | { | |
940 | if (trap) | |
941 | atomic_inc(&trapped); | |
942 | else | |
943 | atomic_dec(&trapped); | |
944 | } | |
1da177e4 | 945 | EXPORT_SYMBOL(netpoll_set_trap); |