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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> |
689971b4 | 29 | #include <linux/if_vlan.h> |
1da177e4 LT |
30 | #include <net/tcp.h> |
31 | #include <net/udp.h> | |
32 | #include <asm/unaligned.h> | |
9cbc1cb8 | 33 | #include <trace/events/napi.h> |
1da177e4 LT |
34 | |
35 | /* | |
36 | * We maintain a small pool of fully-sized skbs, to make sure the | |
37 | * message gets out even in extreme OOM situations. | |
38 | */ | |
39 | ||
40 | #define MAX_UDP_CHUNK 1460 | |
41 | #define MAX_SKBS 32 | |
1da177e4 | 42 | |
a1bcfacd | 43 | static struct sk_buff_head skb_pool; |
1da177e4 LT |
44 | |
45 | static atomic_t trapped; | |
46 | ||
2bdfe0ba | 47 | #define USEC_PER_POLL 50 |
d9452e9f DM |
48 | #define NETPOLL_RX_ENABLED 1 |
49 | #define NETPOLL_RX_DROP 2 | |
1da177e4 | 50 | |
6f706245 JP |
51 | #define MAX_SKB_SIZE \ |
52 | (sizeof(struct ethhdr) + \ | |
53 | sizeof(struct iphdr) + \ | |
54 | sizeof(struct udphdr) + \ | |
55 | MAX_UDP_CHUNK) | |
1da177e4 | 56 | |
3578b0c8 | 57 | static void zap_completion_queue(void); |
2899656b | 58 | static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo); |
1da177e4 | 59 | |
bff38771 AV |
60 | static unsigned int carrier_timeout = 4; |
61 | module_param(carrier_timeout, uint, 0644); | |
62 | ||
e6ec2693 JP |
63 | #define np_info(np, fmt, ...) \ |
64 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
65 | #define np_err(np, fmt, ...) \ | |
66 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
67 | #define np_notice(np, fmt, ...) \ | |
68 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
69 | ||
c4028958 | 70 | static void queue_process(struct work_struct *work) |
1da177e4 | 71 | { |
4c1ac1b4 DH |
72 | struct netpoll_info *npinfo = |
73 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 74 | struct sk_buff *skb; |
3640543d | 75 | unsigned long flags; |
1da177e4 | 76 | |
6c43ff18 SH |
77 | while ((skb = skb_dequeue(&npinfo->txq))) { |
78 | struct net_device *dev = skb->dev; | |
00829823 | 79 | const struct net_device_ops *ops = dev->netdev_ops; |
fd2ea0a7 | 80 | struct netdev_queue *txq; |
1da177e4 | 81 | |
6c43ff18 SH |
82 | if (!netif_device_present(dev) || !netif_running(dev)) { |
83 | __kfree_skb(skb); | |
84 | continue; | |
85 | } | |
1da177e4 | 86 | |
fd2ea0a7 DM |
87 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
88 | ||
3640543d | 89 | local_irq_save(flags); |
fd2ea0a7 | 90 | __netif_tx_lock(txq, smp_processor_id()); |
73466498 | 91 | if (netif_xmit_frozen_or_stopped(txq) || |
00829823 | 92 | ops->ndo_start_xmit(skb, dev) != NETDEV_TX_OK) { |
6c43ff18 | 93 | skb_queue_head(&npinfo->txq, skb); |
fd2ea0a7 | 94 | __netif_tx_unlock(txq); |
3640543d | 95 | local_irq_restore(flags); |
1da177e4 | 96 | |
25442caf | 97 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
98 | return; |
99 | } | |
fd2ea0a7 | 100 | __netif_tx_unlock(txq); |
3640543d | 101 | local_irq_restore(flags); |
1da177e4 | 102 | } |
1da177e4 LT |
103 | } |
104 | ||
b51655b9 AV |
105 | static __sum16 checksum_udp(struct sk_buff *skb, struct udphdr *uh, |
106 | unsigned short ulen, __be32 saddr, __be32 daddr) | |
1da177e4 | 107 | { |
d6f5493c | 108 | __wsum psum; |
fb286bb2 | 109 | |
60476372 | 110 | if (uh->check == 0 || skb_csum_unnecessary(skb)) |
1da177e4 LT |
111 | return 0; |
112 | ||
fb286bb2 HX |
113 | psum = csum_tcpudp_nofold(saddr, daddr, ulen, IPPROTO_UDP, 0); |
114 | ||
84fa7933 | 115 | if (skb->ip_summed == CHECKSUM_COMPLETE && |
d3bc23e7 | 116 | !csum_fold(csum_add(psum, skb->csum))) |
fb286bb2 | 117 | return 0; |
1da177e4 | 118 | |
fb286bb2 | 119 | skb->csum = psum; |
1da177e4 | 120 | |
fb286bb2 | 121 | return __skb_checksum_complete(skb); |
1da177e4 LT |
122 | } |
123 | ||
124 | /* | |
125 | * Check whether delayed processing was scheduled for our NIC. If so, | |
126 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
127 | * If this fails, either we've recursed in ->poll() or it's already | |
128 | * running on another CPU. | |
129 | * | |
130 | * Note: we don't mask interrupts with this lock because we're using | |
131 | * trylock here and interrupts are already disabled in the softirq | |
132 | * case. Further, we test the poll_owner to avoid recursion on UP | |
133 | * systems where the lock doesn't exist. | |
134 | * | |
135 | * In cases where there is bi-directional communications, reading only | |
136 | * one message at a time can lead to packets being dropped by the | |
137 | * network adapter, forcing superfluous retries and possibly timeouts. | |
138 | * Thus, we set our budget to greater than 1. | |
139 | */ | |
0a7606c1 DM |
140 | static int poll_one_napi(struct netpoll_info *npinfo, |
141 | struct napi_struct *napi, int budget) | |
142 | { | |
143 | int work; | |
144 | ||
145 | /* net_rx_action's ->poll() invocations and our's are | |
146 | * synchronized by this test which is only made while | |
147 | * holding the napi->poll_lock. | |
148 | */ | |
149 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
150 | return budget; | |
151 | ||
d9452e9f | 152 | npinfo->rx_flags |= NETPOLL_RX_DROP; |
0a7606c1 | 153 | atomic_inc(&trapped); |
7b363e44 | 154 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
155 | |
156 | work = napi->poll(napi, budget); | |
7d18f114 | 157 | trace_napi_poll(napi); |
0a7606c1 | 158 | |
7b363e44 | 159 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 | 160 | atomic_dec(&trapped); |
d9452e9f | 161 | npinfo->rx_flags &= ~NETPOLL_RX_DROP; |
0a7606c1 DM |
162 | |
163 | return budget - work; | |
164 | } | |
165 | ||
5106930b | 166 | static void poll_napi(struct net_device *dev) |
1da177e4 | 167 | { |
bea3348e | 168 | struct napi_struct *napi; |
1da177e4 LT |
169 | int budget = 16; |
170 | ||
6bdb7fe3 AW |
171 | WARN_ON_ONCE(!irqs_disabled()); |
172 | ||
f13d493d | 173 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
6bdb7fe3 | 174 | local_irq_enable(); |
0a7606c1 | 175 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 176 | spin_trylock(&napi->poll_lock)) { |
6bdb7fe3 | 177 | rcu_read_lock_bh(); |
2899656b AW |
178 | budget = poll_one_napi(rcu_dereference_bh(dev->npinfo), |
179 | napi, budget); | |
6bdb7fe3 | 180 | rcu_read_unlock_bh(); |
bea3348e | 181 | spin_unlock(&napi->poll_lock); |
0a7606c1 | 182 | |
6bdb7fe3 AW |
183 | if (!budget) { |
184 | local_irq_disable(); | |
0a7606c1 | 185 | break; |
6bdb7fe3 | 186 | } |
bea3348e | 187 | } |
6bdb7fe3 | 188 | local_irq_disable(); |
1da177e4 LT |
189 | } |
190 | } | |
191 | ||
068c6e98 NH |
192 | static void service_arp_queue(struct netpoll_info *npi) |
193 | { | |
5106930b SH |
194 | if (npi) { |
195 | struct sk_buff *skb; | |
068c6e98 | 196 | |
5106930b | 197 | while ((skb = skb_dequeue(&npi->arp_tx))) |
2899656b | 198 | netpoll_arp_reply(skb, npi); |
068c6e98 | 199 | } |
068c6e98 NH |
200 | } |
201 | ||
234b921d | 202 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 203 | { |
5e392739 | 204 | const struct net_device_ops *ops; |
2899656b | 205 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
5106930b | 206 | |
5e392739 PE |
207 | if (!dev || !netif_running(dev)) |
208 | return; | |
209 | ||
210 | ops = dev->netdev_ops; | |
211 | if (!ops->ndo_poll_controller) | |
1da177e4 LT |
212 | return; |
213 | ||
214 | /* Process pending work on NIC */ | |
d314774c | 215 | ops->ndo_poll_controller(dev); |
5106930b SH |
216 | |
217 | poll_napi(dev); | |
1da177e4 | 218 | |
58e05f35 | 219 | if (dev->flags & IFF_SLAVE) { |
2899656b | 220 | if (ni) { |
5a698af5 AW |
221 | struct net_device *bond_dev = dev->master; |
222 | struct sk_buff *skb; | |
2899656b AW |
223 | struct netpoll_info *bond_ni = rcu_dereference_bh(bond_dev->npinfo); |
224 | while ((skb = skb_dequeue(&ni->arp_tx))) { | |
5a698af5 | 225 | skb->dev = bond_dev; |
2899656b | 226 | skb_queue_tail(&bond_ni->arp_tx, skb); |
5a698af5 AW |
227 | } |
228 | } | |
229 | } | |
230 | ||
2899656b | 231 | service_arp_queue(ni); |
068c6e98 | 232 | |
3578b0c8 | 233 | zap_completion_queue(); |
1da177e4 LT |
234 | } |
235 | ||
236 | static void refill_skbs(void) | |
237 | { | |
238 | struct sk_buff *skb; | |
239 | unsigned long flags; | |
240 | ||
a1bcfacd SH |
241 | spin_lock_irqsave(&skb_pool.lock, flags); |
242 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
243 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
244 | if (!skb) | |
245 | break; | |
246 | ||
a1bcfacd | 247 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 248 | } |
a1bcfacd | 249 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
250 | } |
251 | ||
3578b0c8 DM |
252 | static void zap_completion_queue(void) |
253 | { | |
254 | unsigned long flags; | |
255 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
256 | ||
257 | if (sd->completion_queue) { | |
258 | struct sk_buff *clist; | |
259 | ||
260 | local_irq_save(flags); | |
261 | clist = sd->completion_queue; | |
262 | sd->completion_queue = NULL; | |
263 | local_irq_restore(flags); | |
264 | ||
265 | while (clist != NULL) { | |
266 | struct sk_buff *skb = clist; | |
267 | clist = clist->next; | |
268 | if (skb->destructor) { | |
269 | atomic_inc(&skb->users); | |
270 | dev_kfree_skb_any(skb); /* put this one back */ | |
271 | } else { | |
272 | __kfree_skb(skb); | |
273 | } | |
274 | } | |
275 | } | |
276 | ||
277 | put_cpu_var(softnet_data); | |
278 | } | |
279 | ||
a1bcfacd | 280 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 281 | { |
a1bcfacd SH |
282 | int count = 0; |
283 | struct sk_buff *skb; | |
1da177e4 | 284 | |
3578b0c8 | 285 | zap_completion_queue(); |
a1bcfacd | 286 | refill_skbs(); |
1da177e4 | 287 | repeat: |
1da177e4 LT |
288 | |
289 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
290 | if (!skb) |
291 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
292 | |
293 | if (!skb) { | |
a1bcfacd | 294 | if (++count < 10) { |
2a49e001 | 295 | netpoll_poll_dev(np->dev); |
a1bcfacd | 296 | goto repeat; |
1da177e4 | 297 | } |
a1bcfacd | 298 | return NULL; |
1da177e4 LT |
299 | } |
300 | ||
301 | atomic_set(&skb->users, 1); | |
302 | skb_reserve(skb, reserve); | |
303 | return skb; | |
304 | } | |
305 | ||
bea3348e SH |
306 | static int netpoll_owner_active(struct net_device *dev) |
307 | { | |
308 | struct napi_struct *napi; | |
309 | ||
310 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
311 | if (napi->poll_owner == smp_processor_id()) | |
312 | return 1; | |
313 | } | |
314 | return 0; | |
315 | } | |
316 | ||
2899656b | 317 | /* call with IRQ disabled */ |
c2355e1a NH |
318 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
319 | struct net_device *dev) | |
1da177e4 | 320 | { |
2bdfe0ba SH |
321 | int status = NETDEV_TX_BUSY; |
322 | unsigned long tries; | |
00829823 | 323 | const struct net_device_ops *ops = dev->netdev_ops; |
de85d99e | 324 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 325 | struct netpoll_info *npinfo; |
2bdfe0ba | 326 | |
2899656b AW |
327 | WARN_ON_ONCE(!irqs_disabled()); |
328 | ||
329 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb YH |
330 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
331 | __kfree_skb(skb); | |
332 | return; | |
333 | } | |
2bdfe0ba SH |
334 | |
335 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 336 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 337 | struct netdev_queue *txq; |
a49f99ff | 338 | |
fd2ea0a7 DM |
339 | txq = netdev_get_tx_queue(dev, skb_get_queue_mapping(skb)); |
340 | ||
0db3dc73 SH |
341 | /* try until next clock tick */ |
342 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
343 | tries > 0; --tries) { | |
fd2ea0a7 | 344 | if (__netif_tx_trylock(txq)) { |
73466498 | 345 | if (!netif_xmit_stopped(txq)) { |
689971b4 AW |
346 | if (vlan_tx_tag_present(skb) && |
347 | !(netif_skb_features(skb) & NETIF_F_HW_VLAN_TX)) { | |
348 | skb = __vlan_put_tag(skb, vlan_tx_tag_get(skb)); | |
349 | if (unlikely(!skb)) | |
350 | break; | |
351 | skb->vlan_tci = 0; | |
352 | } | |
353 | ||
00829823 | 354 | status = ops->ndo_start_xmit(skb, dev); |
08baf561 ED |
355 | if (status == NETDEV_TX_OK) |
356 | txq_trans_update(txq); | |
357 | } | |
fd2ea0a7 | 358 | __netif_tx_unlock(txq); |
e37b8d93 AM |
359 | |
360 | if (status == NETDEV_TX_OK) | |
361 | break; | |
362 | ||
e37b8d93 | 363 | } |
0db3dc73 SH |
364 | |
365 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 366 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
367 | |
368 | udelay(USEC_PER_POLL); | |
0db1d6fc | 369 | } |
79b1bee8 DD |
370 | |
371 | WARN_ONCE(!irqs_disabled(), | |
2899656b | 372 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
79b1bee8 DD |
373 | dev->name, ops->ndo_start_xmit); |
374 | ||
1da177e4 | 375 | } |
1da177e4 | 376 | |
2bdfe0ba | 377 | if (status != NETDEV_TX_OK) { |
5de4a473 | 378 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 379 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 380 | } |
1da177e4 | 381 | } |
c2355e1a | 382 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
383 | |
384 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
385 | { | |
954fba02 | 386 | int total_len, ip_len, udp_len; |
1da177e4 LT |
387 | struct sk_buff *skb; |
388 | struct udphdr *udph; | |
389 | struct iphdr *iph; | |
390 | struct ethhdr *eth; | |
391 | ||
392 | udp_len = len + sizeof(*udph); | |
954fba02 ED |
393 | ip_len = udp_len + sizeof(*iph); |
394 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); | |
1da177e4 | 395 | |
954fba02 ED |
396 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
397 | total_len - len); | |
1da177e4 LT |
398 | if (!skb) |
399 | return; | |
400 | ||
27d7ff46 | 401 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 402 | skb_put(skb, len); |
1da177e4 | 403 | |
4bedb452 ACM |
404 | skb_push(skb, sizeof(*udph)); |
405 | skb_reset_transport_header(skb); | |
406 | udph = udp_hdr(skb); | |
1da177e4 LT |
407 | udph->source = htons(np->local_port); |
408 | udph->dest = htons(np->remote_port); | |
409 | udph->len = htons(udp_len); | |
410 | udph->check = 0; | |
e7557af5 HH |
411 | udph->check = csum_tcpudp_magic(np->local_ip, |
412 | np->remote_ip, | |
8e365eec | 413 | udp_len, IPPROTO_UDP, |
07f0757a | 414 | csum_partial(udph, udp_len, 0)); |
8e365eec | 415 | if (udph->check == 0) |
5e57dff2 | 416 | udph->check = CSUM_MANGLED_0; |
1da177e4 | 417 | |
e2d1bca7 ACM |
418 | skb_push(skb, sizeof(*iph)); |
419 | skb_reset_network_header(skb); | |
eddc9ec5 | 420 | iph = ip_hdr(skb); |
1da177e4 LT |
421 | |
422 | /* iph->version = 4; iph->ihl = 5; */ | |
423 | put_unaligned(0x45, (unsigned char *)iph); | |
424 | iph->tos = 0; | |
425 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
426 | iph->id = 0; | |
427 | iph->frag_off = 0; | |
428 | iph->ttl = 64; | |
429 | iph->protocol = IPPROTO_UDP; | |
430 | iph->check = 0; | |
e7557af5 HH |
431 | put_unaligned(np->local_ip, &(iph->saddr)); |
432 | put_unaligned(np->remote_ip, &(iph->daddr)); | |
1da177e4 LT |
433 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); |
434 | ||
435 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
459a98ed | 436 | skb_reset_mac_header(skb); |
206daaf7 | 437 | skb->protocol = eth->h_proto = htons(ETH_P_IP); |
09538641 SH |
438 | memcpy(eth->h_source, np->dev->dev_addr, ETH_ALEN); |
439 | memcpy(eth->h_dest, np->remote_mac, ETH_ALEN); | |
1da177e4 LT |
440 | |
441 | skb->dev = np->dev; | |
442 | ||
443 | netpoll_send_skb(np, skb); | |
444 | } | |
9e34a5b5 | 445 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 446 | |
2899656b | 447 | static void netpoll_arp_reply(struct sk_buff *skb, struct netpoll_info *npinfo) |
1da177e4 LT |
448 | { |
449 | struct arphdr *arp; | |
450 | unsigned char *arp_ptr; | |
451 | int size, type = ARPOP_REPLY, ptype = ETH_P_ARP; | |
252e3346 | 452 | __be32 sip, tip; |
47bbec02 | 453 | unsigned char *sha; |
1da177e4 | 454 | struct sk_buff *send_skb; |
508e14b4 DB |
455 | struct netpoll *np, *tmp; |
456 | unsigned long flags; | |
ae641949 | 457 | int hlen, tlen; |
508e14b4 DB |
458 | int hits = 0; |
459 | ||
460 | if (list_empty(&npinfo->rx_np)) | |
461 | return; | |
462 | ||
463 | /* Before checking the packet, we do some early | |
464 | inspection whether this is interesting at all */ | |
465 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
466 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
467 | if (np->dev == skb->dev) | |
468 | hits++; | |
469 | } | |
470 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 | 471 | |
508e14b4 DB |
472 | /* No netpoll struct is using this dev */ |
473 | if (!hits) | |
115c1d6e | 474 | return; |
1da177e4 LT |
475 | |
476 | /* No arp on this interface */ | |
477 | if (skb->dev->flags & IFF_NOARP) | |
478 | return; | |
479 | ||
988b7050 | 480 | if (!pskb_may_pull(skb, arp_hdr_len(skb->dev))) |
1da177e4 LT |
481 | return; |
482 | ||
c1d2bbe1 | 483 | skb_reset_network_header(skb); |
badff6d0 | 484 | skb_reset_transport_header(skb); |
d0a92be0 | 485 | arp = arp_hdr(skb); |
1da177e4 LT |
486 | |
487 | if ((arp->ar_hrd != htons(ARPHRD_ETHER) && | |
488 | arp->ar_hrd != htons(ARPHRD_IEEE802)) || | |
489 | arp->ar_pro != htons(ETH_P_IP) || | |
490 | arp->ar_op != htons(ARPOP_REQUEST)) | |
491 | return; | |
492 | ||
47bbec02 NH |
493 | arp_ptr = (unsigned char *)(arp+1); |
494 | /* save the location of the src hw addr */ | |
495 | sha = arp_ptr; | |
496 | arp_ptr += skb->dev->addr_len; | |
1da177e4 | 497 | memcpy(&sip, arp_ptr, 4); |
47bbec02 | 498 | arp_ptr += 4; |
508e14b4 DB |
499 | /* If we actually cared about dst hw addr, |
500 | it would get copied here */ | |
47bbec02 | 501 | arp_ptr += skb->dev->addr_len; |
1da177e4 LT |
502 | memcpy(&tip, arp_ptr, 4); |
503 | ||
504 | /* Should we ignore arp? */ | |
508e14b4 | 505 | if (ipv4_is_loopback(tip) || ipv4_is_multicast(tip)) |
1da177e4 LT |
506 | return; |
507 | ||
988b7050 | 508 | size = arp_hdr_len(skb->dev); |
1da177e4 | 509 | |
508e14b4 DB |
510 | spin_lock_irqsave(&npinfo->rx_lock, flags); |
511 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { | |
512 | if (tip != np->local_ip) | |
513 | continue; | |
1da177e4 | 514 | |
ae641949 HX |
515 | hlen = LL_RESERVED_SPACE(np->dev); |
516 | tlen = np->dev->needed_tailroom; | |
517 | send_skb = find_skb(np, size + hlen + tlen, hlen); | |
508e14b4 DB |
518 | if (!send_skb) |
519 | continue; | |
1da177e4 | 520 | |
508e14b4 DB |
521 | skb_reset_network_header(send_skb); |
522 | arp = (struct arphdr *) skb_put(send_skb, size); | |
523 | send_skb->dev = skb->dev; | |
524 | send_skb->protocol = htons(ETH_P_ARP); | |
1da177e4 | 525 | |
508e14b4 DB |
526 | /* Fill the device header for the ARP frame */ |
527 | if (dev_hard_header(send_skb, skb->dev, ptype, | |
528 | sha, np->dev->dev_addr, | |
529 | send_skb->len) < 0) { | |
530 | kfree_skb(send_skb); | |
531 | continue; | |
532 | } | |
1da177e4 | 533 | |
508e14b4 DB |
534 | /* |
535 | * Fill out the arp protocol part. | |
536 | * | |
537 | * we only support ethernet device type, | |
538 | * which (according to RFC 1390) should | |
539 | * always equal 1 (Ethernet). | |
540 | */ | |
1da177e4 | 541 | |
508e14b4 DB |
542 | arp->ar_hrd = htons(np->dev->type); |
543 | arp->ar_pro = htons(ETH_P_IP); | |
544 | arp->ar_hln = np->dev->addr_len; | |
545 | arp->ar_pln = 4; | |
546 | arp->ar_op = htons(type); | |
547 | ||
548 | arp_ptr = (unsigned char *)(arp + 1); | |
549 | memcpy(arp_ptr, np->dev->dev_addr, np->dev->addr_len); | |
550 | arp_ptr += np->dev->addr_len; | |
551 | memcpy(arp_ptr, &tip, 4); | |
552 | arp_ptr += 4; | |
553 | memcpy(arp_ptr, sha, np->dev->addr_len); | |
554 | arp_ptr += np->dev->addr_len; | |
555 | memcpy(arp_ptr, &sip, 4); | |
556 | ||
557 | netpoll_send_skb(np, send_skb); | |
558 | ||
559 | /* If there are several rx_hooks for the same address, | |
560 | we're fine by sending a single reply */ | |
561 | break; | |
562 | } | |
563 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
1da177e4 LT |
564 | } |
565 | ||
57c5d461 | 566 | int __netpoll_rx(struct sk_buff *skb, struct netpoll_info *npinfo) |
1da177e4 LT |
567 | { |
568 | int proto, len, ulen; | |
508e14b4 | 569 | int hits = 0; |
b71d1d42 | 570 | const struct iphdr *iph; |
1da177e4 | 571 | struct udphdr *uh; |
508e14b4 | 572 | struct netpoll *np, *tmp; |
068c6e98 | 573 | |
508e14b4 | 574 | if (list_empty(&npinfo->rx_np)) |
1da177e4 | 575 | goto out; |
508e14b4 | 576 | |
1da177e4 LT |
577 | if (skb->dev->type != ARPHRD_ETHER) |
578 | goto out; | |
579 | ||
d9452e9f | 580 | /* check if netpoll clients need ARP */ |
724800d6 | 581 | if (skb->protocol == htons(ETH_P_ARP) && |
1da177e4 | 582 | atomic_read(&trapped)) { |
508e14b4 | 583 | skb_queue_tail(&npinfo->arp_tx, skb); |
1da177e4 LT |
584 | return 1; |
585 | } | |
586 | ||
689971b4 AW |
587 | if (skb->protocol == cpu_to_be16(ETH_P_8021Q)) { |
588 | skb = vlan_untag(skb); | |
589 | if (unlikely(!skb)) | |
590 | goto out; | |
591 | } | |
592 | ||
1da177e4 LT |
593 | proto = ntohs(eth_hdr(skb)->h_proto); |
594 | if (proto != ETH_P_IP) | |
595 | goto out; | |
596 | if (skb->pkt_type == PACKET_OTHERHOST) | |
597 | goto out; | |
598 | if (skb_shared(skb)) | |
599 | goto out; | |
600 | ||
1da177e4 LT |
601 | if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
602 | goto out; | |
e9278a47 | 603 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
604 | if (iph->ihl < 5 || iph->version != 4) |
605 | goto out; | |
606 | if (!pskb_may_pull(skb, iph->ihl*4)) | |
607 | goto out; | |
e9278a47 | 608 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
609 | if (ip_fast_csum((u8 *)iph, iph->ihl) != 0) |
610 | goto out; | |
611 | ||
612 | len = ntohs(iph->tot_len); | |
613 | if (skb->len < len || len < iph->ihl*4) | |
614 | goto out; | |
615 | ||
5e7d7fa5 AL |
616 | /* |
617 | * Our transport medium may have padded the buffer out. | |
618 | * Now We trim to the true length of the frame. | |
619 | */ | |
620 | if (pskb_trim_rcsum(skb, len)) | |
621 | goto out; | |
622 | ||
e9278a47 | 623 | iph = (struct iphdr *)skb->data; |
1da177e4 LT |
624 | if (iph->protocol != IPPROTO_UDP) |
625 | goto out; | |
626 | ||
627 | len -= iph->ihl*4; | |
628 | uh = (struct udphdr *)(((char *)iph) + iph->ihl*4); | |
629 | ulen = ntohs(uh->len); | |
630 | ||
631 | if (ulen != len) | |
632 | goto out; | |
fb286bb2 | 633 | if (checksum_udp(skb, uh, ulen, iph->saddr, iph->daddr)) |
1da177e4 | 634 | goto out; |
1da177e4 | 635 | |
508e14b4 DB |
636 | list_for_each_entry_safe(np, tmp, &npinfo->rx_np, rx) { |
637 | if (np->local_ip && np->local_ip != iph->daddr) | |
638 | continue; | |
639 | if (np->remote_ip && np->remote_ip != iph->saddr) | |
640 | continue; | |
641 | if (np->local_port && np->local_port != ntohs(uh->dest)) | |
642 | continue; | |
643 | ||
644 | np->rx_hook(np, ntohs(uh->source), | |
645 | (char *)(uh+1), | |
646 | ulen - sizeof(struct udphdr)); | |
647 | hits++; | |
648 | } | |
649 | ||
650 | if (!hits) | |
651 | goto out; | |
1da177e4 LT |
652 | |
653 | kfree_skb(skb); | |
654 | return 1; | |
655 | ||
656 | out: | |
657 | if (atomic_read(&trapped)) { | |
658 | kfree_skb(skb); | |
659 | return 1; | |
660 | } | |
661 | ||
662 | return 0; | |
663 | } | |
664 | ||
0bcc1816 SS |
665 | void netpoll_print_options(struct netpoll *np) |
666 | { | |
e6ec2693 JP |
667 | np_info(np, "local port %d\n", np->local_port); |
668 | np_info(np, "local IP %pI4\n", &np->local_ip); | |
669 | np_info(np, "interface '%s'\n", np->dev_name); | |
670 | np_info(np, "remote port %d\n", np->remote_port); | |
671 | np_info(np, "remote IP %pI4\n", &np->remote_ip); | |
672 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); | |
0bcc1816 | 673 | } |
9e34a5b5 | 674 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 675 | |
1da177e4 LT |
676 | int netpoll_parse_options(struct netpoll *np, char *opt) |
677 | { | |
678 | char *cur=opt, *delim; | |
679 | ||
c68b9070 | 680 | if (*cur != '@') { |
1da177e4 LT |
681 | if ((delim = strchr(cur, '@')) == NULL) |
682 | goto parse_failed; | |
c68b9070 DM |
683 | *delim = 0; |
684 | np->local_port = simple_strtol(cur, NULL, 10); | |
685 | cur = delim; | |
1da177e4 LT |
686 | } |
687 | cur++; | |
1da177e4 | 688 | |
c68b9070 | 689 | if (*cur != '/') { |
1da177e4 LT |
690 | if ((delim = strchr(cur, '/')) == NULL) |
691 | goto parse_failed; | |
c68b9070 | 692 | *delim = 0; |
e7557af5 | 693 | np->local_ip = in_aton(cur); |
c68b9070 | 694 | cur = delim; |
1da177e4 LT |
695 | } |
696 | cur++; | |
697 | ||
c68b9070 | 698 | if (*cur != ',') { |
1da177e4 LT |
699 | /* parse out dev name */ |
700 | if ((delim = strchr(cur, ',')) == NULL) | |
701 | goto parse_failed; | |
c68b9070 | 702 | *delim = 0; |
1da177e4 | 703 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 704 | cur = delim; |
1da177e4 LT |
705 | } |
706 | cur++; | |
707 | ||
c68b9070 | 708 | if (*cur != '@') { |
1da177e4 LT |
709 | /* dst port */ |
710 | if ((delim = strchr(cur, '@')) == NULL) | |
711 | goto parse_failed; | |
c68b9070 | 712 | *delim = 0; |
5fc05f87 | 713 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 714 | np_info(np, "warning: whitespace is not allowed\n"); |
c68b9070 DM |
715 | np->remote_port = simple_strtol(cur, NULL, 10); |
716 | cur = delim; | |
1da177e4 LT |
717 | } |
718 | cur++; | |
1da177e4 LT |
719 | |
720 | /* dst ip */ | |
721 | if ((delim = strchr(cur, '/')) == NULL) | |
722 | goto parse_failed; | |
c68b9070 | 723 | *delim = 0; |
e7557af5 | 724 | np->remote_ip = in_aton(cur); |
c68b9070 | 725 | cur = delim + 1; |
1da177e4 | 726 | |
c68b9070 | 727 | if (*cur != 0) { |
1da177e4 | 728 | /* MAC address */ |
4940fc88 | 729 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 730 | goto parse_failed; |
1da177e4 LT |
731 | } |
732 | ||
0bcc1816 | 733 | netpoll_print_options(np); |
1da177e4 LT |
734 | |
735 | return 0; | |
736 | ||
737 | parse_failed: | |
e6ec2693 | 738 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
739 | return -1; |
740 | } | |
9e34a5b5 | 741 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 742 | |
47be03a2 | 743 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev, gfp_t gfp) |
1da177e4 | 744 | { |
115c1d6e | 745 | struct netpoll_info *npinfo; |
4247e161 | 746 | const struct net_device_ops *ops; |
fbeec2e1 | 747 | unsigned long flags; |
b41848b6 | 748 | int err; |
1da177e4 | 749 | |
30fdd8a0 JP |
750 | np->dev = ndev; |
751 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); | |
752 | ||
8fdd95ec HX |
753 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
754 | !ndev->netdev_ops->ndo_poll_controller) { | |
e6ec2693 JP |
755 | np_err(np, "%s doesn't support polling, aborting\n", |
756 | np->dev_name); | |
8fdd95ec HX |
757 | err = -ENOTSUPP; |
758 | goto out; | |
759 | } | |
760 | ||
761 | if (!ndev->npinfo) { | |
47be03a2 | 762 | npinfo = kmalloc(sizeof(*npinfo), gfp); |
8fdd95ec HX |
763 | if (!npinfo) { |
764 | err = -ENOMEM; | |
765 | goto out; | |
766 | } | |
767 | ||
768 | npinfo->rx_flags = 0; | |
769 | INIT_LIST_HEAD(&npinfo->rx_np); | |
770 | ||
771 | spin_lock_init(&npinfo->rx_lock); | |
772 | skb_queue_head_init(&npinfo->arp_tx); | |
773 | skb_queue_head_init(&npinfo->txq); | |
774 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
775 | ||
776 | atomic_set(&npinfo->refcnt, 1); | |
777 | ||
778 | ops = np->dev->netdev_ops; | |
779 | if (ops->ndo_netpoll_setup) { | |
47be03a2 | 780 | err = ops->ndo_netpoll_setup(ndev, npinfo, gfp); |
8fdd95ec HX |
781 | if (err) |
782 | goto free_npinfo; | |
783 | } | |
784 | } else { | |
785 | npinfo = ndev->npinfo; | |
786 | atomic_inc(&npinfo->refcnt); | |
787 | } | |
788 | ||
789 | npinfo->netpoll = np; | |
790 | ||
791 | if (np->rx_hook) { | |
792 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
793 | npinfo->rx_flags |= NETPOLL_RX_ENABLED; | |
794 | list_add_tail(&np->rx, &npinfo->rx_np); | |
795 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
796 | } | |
797 | ||
798 | /* last thing to do is link it to the net device structure */ | |
cf778b00 | 799 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
800 | |
801 | return 0; | |
802 | ||
803 | free_npinfo: | |
804 | kfree(npinfo); | |
805 | out: | |
806 | return err; | |
807 | } | |
808 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
809 | ||
810 | int netpoll_setup(struct netpoll *np) | |
811 | { | |
812 | struct net_device *ndev = NULL; | |
813 | struct in_device *in_dev; | |
814 | int err; | |
815 | ||
1da177e4 | 816 | if (np->dev_name) |
881d966b | 817 | ndev = dev_get_by_name(&init_net, np->dev_name); |
1da177e4 | 818 | if (!ndev) { |
e6ec2693 | 819 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
b41848b6 | 820 | return -ENODEV; |
1da177e4 LT |
821 | } |
822 | ||
0c1ad04a | 823 | if (ndev->master) { |
e6ec2693 | 824 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
825 | err = -EBUSY; |
826 | goto put; | |
0c1ad04a WC |
827 | } |
828 | ||
1da177e4 LT |
829 | if (!netif_running(ndev)) { |
830 | unsigned long atmost, atleast; | |
831 | ||
e6ec2693 | 832 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 833 | |
6756ae4b | 834 | rtnl_lock(); |
b41848b6 SH |
835 | err = dev_open(ndev); |
836 | rtnl_unlock(); | |
837 | ||
838 | if (err) { | |
e6ec2693 | 839 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 840 | goto put; |
1da177e4 | 841 | } |
1da177e4 LT |
842 | |
843 | atleast = jiffies + HZ/10; | |
bff38771 | 844 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
845 | while (!netif_carrier_ok(ndev)) { |
846 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 847 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
848 | break; |
849 | } | |
1b614fb9 | 850 | msleep(1); |
1da177e4 LT |
851 | } |
852 | ||
853 | /* If carrier appears to come up instantly, we don't | |
854 | * trust it and pause so that we don't pump all our | |
855 | * queued console messages into the bitbucket. | |
856 | */ | |
857 | ||
858 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 859 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
860 | msleep(4000); |
861 | } | |
862 | } | |
863 | ||
1da177e4 LT |
864 | if (!np->local_ip) { |
865 | rcu_read_lock(); | |
e5ed6399 | 866 | in_dev = __in_dev_get_rcu(ndev); |
1da177e4 LT |
867 | |
868 | if (!in_dev || !in_dev->ifa_list) { | |
869 | rcu_read_unlock(); | |
e6ec2693 JP |
870 | np_err(np, "no IP address for %s, aborting\n", |
871 | np->dev_name); | |
b41848b6 | 872 | err = -EDESTADDRREQ; |
dbaa1541 | 873 | goto put; |
1da177e4 LT |
874 | } |
875 | ||
e7557af5 | 876 | np->local_ip = in_dev->ifa_list->ifa_local; |
1da177e4 | 877 | rcu_read_unlock(); |
e6ec2693 | 878 | np_info(np, "local IP %pI4\n", &np->local_ip); |
1da177e4 LT |
879 | } |
880 | ||
dbaa1541 HX |
881 | /* fill up the skb queue */ |
882 | refill_skbs(); | |
883 | ||
884 | rtnl_lock(); | |
47be03a2 | 885 | err = __netpoll_setup(np, ndev, GFP_KERNEL); |
dbaa1541 | 886 | rtnl_unlock(); |
53fb95d3 | 887 | |
8fdd95ec HX |
888 | if (err) |
889 | goto put; | |
890 | ||
1da177e4 LT |
891 | return 0; |
892 | ||
21edbb22 | 893 | put: |
1da177e4 | 894 | dev_put(ndev); |
b41848b6 | 895 | return err; |
1da177e4 | 896 | } |
9e34a5b5 | 897 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 898 | |
c68b9070 DM |
899 | static int __init netpoll_init(void) |
900 | { | |
a1bcfacd SH |
901 | skb_queue_head_init(&skb_pool); |
902 | return 0; | |
903 | } | |
904 | core_initcall(netpoll_init); | |
905 | ||
38e6bc18 AW |
906 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
907 | { | |
908 | struct netpoll_info *npinfo = | |
909 | container_of(rcu_head, struct netpoll_info, rcu); | |
910 | ||
911 | skb_queue_purge(&npinfo->arp_tx); | |
912 | skb_queue_purge(&npinfo->txq); | |
913 | ||
914 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
915 | cancel_delayed_work(&npinfo->tx_work); | |
916 | ||
917 | /* clean after last, unfinished work */ | |
918 | __skb_queue_purge(&npinfo->txq); | |
919 | /* now cancel it again */ | |
920 | cancel_delayed_work(&npinfo->tx_work); | |
921 | kfree(npinfo); | |
922 | } | |
923 | ||
8fdd95ec | 924 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 925 | { |
fbeec2e1 JM |
926 | struct netpoll_info *npinfo; |
927 | unsigned long flags; | |
928 | ||
8fdd95ec HX |
929 | npinfo = np->dev->npinfo; |
930 | if (!npinfo) | |
dbaa1541 | 931 | return; |
93ec2c72 | 932 | |
8fdd95ec HX |
933 | if (!list_empty(&npinfo->rx_np)) { |
934 | spin_lock_irqsave(&npinfo->rx_lock, flags); | |
935 | list_del(&np->rx); | |
936 | if (list_empty(&npinfo->rx_np)) | |
937 | npinfo->rx_flags &= ~NETPOLL_RX_ENABLED; | |
938 | spin_unlock_irqrestore(&npinfo->rx_lock, flags); | |
939 | } | |
de85d99e | 940 | |
8fdd95ec HX |
941 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
942 | const struct net_device_ops *ops; | |
de85d99e | 943 | |
8fdd95ec HX |
944 | ops = np->dev->netdev_ops; |
945 | if (ops->ndo_netpoll_cleanup) | |
946 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 947 | |
a9b3cd7f | 948 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
38e6bc18 AW |
949 | call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); |
950 | } | |
951 | } | |
952 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 953 | |
38e6bc18 AW |
954 | static void rcu_cleanup_netpoll(struct rcu_head *rcu_head) |
955 | { | |
956 | struct netpoll *np = container_of(rcu_head, struct netpoll, rcu); | |
93ec2c72 | 957 | |
38e6bc18 AW |
958 | __netpoll_cleanup(np); |
959 | kfree(np); | |
960 | } | |
93ec2c72 | 961 | |
38e6bc18 AW |
962 | void __netpoll_free_rcu(struct netpoll *np) |
963 | { | |
964 | call_rcu_bh(&np->rcu, rcu_cleanup_netpoll); | |
8fdd95ec | 965 | } |
38e6bc18 | 966 | EXPORT_SYMBOL_GPL(__netpoll_free_rcu); |
fbeec2e1 | 967 | |
8fdd95ec HX |
968 | void netpoll_cleanup(struct netpoll *np) |
969 | { | |
970 | if (!np->dev) | |
971 | return; | |
dbaa1541 | 972 | |
8fdd95ec HX |
973 | rtnl_lock(); |
974 | __netpoll_cleanup(np); | |
975 | rtnl_unlock(); | |
976 | ||
977 | dev_put(np->dev); | |
1da177e4 LT |
978 | np->dev = NULL; |
979 | } | |
9e34a5b5 | 980 | EXPORT_SYMBOL(netpoll_cleanup); |
1da177e4 LT |
981 | |
982 | int netpoll_trap(void) | |
983 | { | |
984 | return atomic_read(&trapped); | |
985 | } | |
9e34a5b5 | 986 | EXPORT_SYMBOL(netpoll_trap); |
1da177e4 LT |
987 | |
988 | void netpoll_set_trap(int trap) | |
989 | { | |
990 | if (trap) | |
991 | atomic_inc(&trapped); | |
992 | else | |
993 | atomic_dec(&trapped); | |
994 | } | |
1da177e4 | 995 | EXPORT_SYMBOL(netpoll_set_trap); |