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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> |
4cd5773a | 15 | #include <linux/kernel.h> |
1da177e4 LT |
16 | #include <linux/netdevice.h> |
17 | #include <linux/etherdevice.h> | |
18 | #include <linux/string.h> | |
14c85021 | 19 | #include <linux/if_arp.h> |
1da177e4 LT |
20 | #include <linux/inetdevice.h> |
21 | #include <linux/inet.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/netpoll.h> | |
24 | #include <linux/sched.h> | |
25 | #include <linux/delay.h> | |
26 | #include <linux/rcupdate.h> | |
27 | #include <linux/workqueue.h> | |
5a0e3ad6 | 28 | #include <linux/slab.h> |
bc3b2d7f | 29 | #include <linux/export.h> |
689971b4 | 30 | #include <linux/if_vlan.h> |
1da177e4 LT |
31 | #include <net/tcp.h> |
32 | #include <net/udp.h> | |
b3d936f3 CW |
33 | #include <net/addrconf.h> |
34 | #include <net/ndisc.h> | |
35 | #include <net/ip6_checksum.h> | |
1da177e4 | 36 | #include <asm/unaligned.h> |
9cbc1cb8 | 37 | #include <trace/events/napi.h> |
1da177e4 LT |
38 | |
39 | /* | |
40 | * We maintain a small pool of fully-sized skbs, to make sure the | |
41 | * message gets out even in extreme OOM situations. | |
42 | */ | |
43 | ||
44 | #define MAX_UDP_CHUNK 1460 | |
45 | #define MAX_SKBS 32 | |
1da177e4 | 46 | |
a1bcfacd | 47 | static struct sk_buff_head skb_pool; |
1da177e4 | 48 | |
7f9421c2 | 49 | DEFINE_STATIC_SRCU(netpoll_srcu); |
ca99ca14 | 50 | |
2bdfe0ba | 51 | #define USEC_PER_POLL 50 |
1da177e4 | 52 | |
6f706245 JP |
53 | #define MAX_SKB_SIZE \ |
54 | (sizeof(struct ethhdr) + \ | |
55 | sizeof(struct iphdr) + \ | |
56 | sizeof(struct udphdr) + \ | |
57 | MAX_UDP_CHUNK) | |
1da177e4 | 58 | |
3578b0c8 | 59 | static void zap_completion_queue(void); |
2cde6acd | 60 | static void netpoll_async_cleanup(struct work_struct *work); |
1da177e4 | 61 | |
bff38771 AV |
62 | static unsigned int carrier_timeout = 4; |
63 | module_param(carrier_timeout, uint, 0644); | |
64 | ||
e6ec2693 JP |
65 | #define np_info(np, fmt, ...) \ |
66 | pr_info("%s: " fmt, np->name, ##__VA_ARGS__) | |
67 | #define np_err(np, fmt, ...) \ | |
68 | pr_err("%s: " fmt, np->name, ##__VA_ARGS__) | |
69 | #define np_notice(np, fmt, ...) \ | |
70 | pr_notice("%s: " fmt, np->name, ##__VA_ARGS__) | |
71 | ||
944e2948 EB |
72 | static int netpoll_start_xmit(struct sk_buff *skb, struct net_device *dev, |
73 | struct netdev_queue *txq) | |
74 | { | |
944e2948 EB |
75 | int status = NETDEV_TX_OK; |
76 | netdev_features_t features; | |
77 | ||
78 | features = netif_skb_features(skb); | |
79 | ||
df8a39de | 80 | if (skb_vlan_tag_present(skb) && |
944e2948 | 81 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { |
5968250c | 82 | skb = __vlan_hwaccel_push_inside(skb); |
944e2948 EB |
83 | if (unlikely(!skb)) { |
84 | /* This is actually a packet drop, but we | |
85 | * don't want the code that calls this | |
86 | * function to try and operate on a NULL skb. | |
87 | */ | |
88 | goto out; | |
89 | } | |
944e2948 EB |
90 | } |
91 | ||
fa2dbdc2 | 92 | status = netdev_start_xmit(skb, dev, txq, false); |
944e2948 EB |
93 | |
94 | out: | |
95 | return status; | |
96 | } | |
97 | ||
c4028958 | 98 | static void queue_process(struct work_struct *work) |
1da177e4 | 99 | { |
4c1ac1b4 DH |
100 | struct netpoll_info *npinfo = |
101 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 102 | struct sk_buff *skb; |
3640543d | 103 | unsigned long flags; |
1da177e4 | 104 | |
6c43ff18 SH |
105 | while ((skb = skb_dequeue(&npinfo->txq))) { |
106 | struct net_device *dev = skb->dev; | |
fd2ea0a7 | 107 | struct netdev_queue *txq; |
1da177e4 | 108 | |
6c43ff18 | 109 | if (!netif_device_present(dev) || !netif_running(dev)) { |
080b3c19 | 110 | kfree_skb(skb); |
6c43ff18 SH |
111 | continue; |
112 | } | |
1da177e4 | 113 | |
10c51b56 | 114 | txq = skb_get_tx_queue(dev, skb); |
fd2ea0a7 | 115 | |
3640543d | 116 | local_irq_save(flags); |
5efeac44 | 117 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
73466498 | 118 | if (netif_xmit_frozen_or_stopped(txq) || |
944e2948 | 119 | netpoll_start_xmit(skb, dev, txq) != NETDEV_TX_OK) { |
6c43ff18 | 120 | skb_queue_head(&npinfo->txq, skb); |
5efeac44 | 121 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 122 | local_irq_restore(flags); |
1da177e4 | 123 | |
25442caf | 124 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
125 | return; |
126 | } | |
5efeac44 | 127 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 128 | local_irq_restore(flags); |
1da177e4 | 129 | } |
1da177e4 LT |
130 | } |
131 | ||
1da177e4 LT |
132 | /* |
133 | * Check whether delayed processing was scheduled for our NIC. If so, | |
134 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
135 | * If this fails, either we've recursed in ->poll() or it's already | |
136 | * running on another CPU. | |
137 | * | |
138 | * Note: we don't mask interrupts with this lock because we're using | |
139 | * trylock here and interrupts are already disabled in the softirq | |
140 | * case. Further, we test the poll_owner to avoid recursion on UP | |
141 | * systems where the lock doesn't exist. | |
1da177e4 | 142 | */ |
b249b51b | 143 | static int poll_one_napi(struct napi_struct *napi, int budget) |
0a7606c1 DM |
144 | { |
145 | int work; | |
146 | ||
147 | /* net_rx_action's ->poll() invocations and our's are | |
148 | * synchronized by this test which is only made while | |
149 | * holding the napi->poll_lock. | |
150 | */ | |
151 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
152 | return budget; | |
153 | ||
7b363e44 | 154 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
155 | |
156 | work = napi->poll(napi, budget); | |
e97dc3fc | 157 | WARN_ONCE(work > budget, "%pF exceeded budget in poll\n", napi->poll); |
7d18f114 | 158 | trace_napi_poll(napi); |
0a7606c1 | 159 | |
7b363e44 | 160 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
161 | |
162 | return budget - work; | |
163 | } | |
164 | ||
9852fbec | 165 | static void poll_napi(struct net_device *dev, int budget) |
1da177e4 | 166 | { |
bea3348e | 167 | struct napi_struct *napi; |
1da177e4 | 168 | |
f13d493d | 169 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 170 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 171 | spin_trylock(&napi->poll_lock)) { |
b249b51b | 172 | budget = poll_one_napi(napi, budget); |
bea3348e SH |
173 | spin_unlock(&napi->poll_lock); |
174 | } | |
1da177e4 LT |
175 | } |
176 | } | |
177 | ||
234b921d | 178 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 179 | { |
5e392739 | 180 | const struct net_device_ops *ops; |
2899656b | 181 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
9c62a68d | 182 | int budget = 0; |
5106930b | 183 | |
ca99ca14 NH |
184 | /* Don't do any rx activity if the dev_lock mutex is held |
185 | * the dev_open/close paths use this to block netpoll activity | |
186 | * while changing device state | |
187 | */ | |
a3dbbc2b | 188 | if (down_trylock(&ni->dev_lock)) |
ca99ca14 NH |
189 | return; |
190 | ||
959d5fde | 191 | if (!netif_running(dev)) { |
bd7c4b60 | 192 | up(&ni->dev_lock); |
5e392739 | 193 | return; |
959d5fde | 194 | } |
5e392739 PE |
195 | |
196 | ops = dev->netdev_ops; | |
959d5fde | 197 | if (!ops->ndo_poll_controller) { |
bd7c4b60 | 198 | up(&ni->dev_lock); |
1da177e4 | 199 | return; |
959d5fde | 200 | } |
1da177e4 LT |
201 | |
202 | /* Process pending work on NIC */ | |
d314774c | 203 | ops->ndo_poll_controller(dev); |
5106930b | 204 | |
9852fbec | 205 | poll_napi(dev, budget); |
1da177e4 | 206 | |
bd7c4b60 | 207 | up(&ni->dev_lock); |
ca99ca14 | 208 | |
3578b0c8 | 209 | zap_completion_queue(); |
1da177e4 LT |
210 | } |
211 | ||
66b5552f | 212 | void netpoll_poll_disable(struct net_device *dev) |
ca99ca14 NH |
213 | { |
214 | struct netpoll_info *ni; | |
215 | int idx; | |
216 | might_sleep(); | |
217 | idx = srcu_read_lock(&netpoll_srcu); | |
218 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
219 | if (ni) | |
bd7c4b60 | 220 | down(&ni->dev_lock); |
ca99ca14 | 221 | srcu_read_unlock(&netpoll_srcu, idx); |
ca99ca14 | 222 | } |
66b5552f | 223 | EXPORT_SYMBOL(netpoll_poll_disable); |
ca99ca14 | 224 | |
66b5552f | 225 | void netpoll_poll_enable(struct net_device *dev) |
ca99ca14 NH |
226 | { |
227 | struct netpoll_info *ni; | |
228 | rcu_read_lock(); | |
229 | ni = rcu_dereference(dev->npinfo); | |
230 | if (ni) | |
bd7c4b60 | 231 | up(&ni->dev_lock); |
ca99ca14 NH |
232 | rcu_read_unlock(); |
233 | } | |
66b5552f | 234 | EXPORT_SYMBOL(netpoll_poll_enable); |
ca99ca14 | 235 | |
1da177e4 LT |
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; | |
b1586f09 | 268 | if (!skb_irq_freeable(skb)) { |
3578b0c8 DM |
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; | |
de85d99e | 323 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 324 | struct netpoll_info *npinfo; |
2bdfe0ba | 325 | |
2899656b AW |
326 | WARN_ON_ONCE(!irqs_disabled()); |
327 | ||
328 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb | 329 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
080b3c19 | 330 | dev_kfree_skb_irq(skb); |
4ec93edb YH |
331 | return; |
332 | } | |
2bdfe0ba SH |
333 | |
334 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 335 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 336 | struct netdev_queue *txq; |
a49f99ff | 337 | |
f663dd9a | 338 | txq = netdev_pick_tx(dev, skb, NULL); |
fd2ea0a7 | 339 | |
0db3dc73 SH |
340 | /* try until next clock tick */ |
341 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
342 | tries > 0; --tries) { | |
5efeac44 | 343 | if (HARD_TX_TRYLOCK(dev, txq)) { |
944e2948 EB |
344 | if (!netif_xmit_stopped(txq)) |
345 | status = netpoll_start_xmit(skb, dev, txq); | |
346 | ||
5efeac44 | 347 | HARD_TX_UNLOCK(dev, txq); |
e37b8d93 AM |
348 | |
349 | if (status == NETDEV_TX_OK) | |
350 | break; | |
351 | ||
e37b8d93 | 352 | } |
0db3dc73 SH |
353 | |
354 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 355 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
356 | |
357 | udelay(USEC_PER_POLL); | |
0db1d6fc | 358 | } |
79b1bee8 DD |
359 | |
360 | WARN_ONCE(!irqs_disabled(), | |
2899656b | 361 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
944e2948 | 362 | dev->name, dev->netdev_ops->ndo_start_xmit); |
79b1bee8 | 363 | |
1da177e4 | 364 | } |
1da177e4 | 365 | |
2bdfe0ba | 366 | if (status != NETDEV_TX_OK) { |
5de4a473 | 367 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 368 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 369 | } |
1da177e4 | 370 | } |
c2355e1a | 371 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
372 | |
373 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
374 | { | |
954fba02 | 375 | int total_len, ip_len, udp_len; |
1da177e4 LT |
376 | struct sk_buff *skb; |
377 | struct udphdr *udph; | |
378 | struct iphdr *iph; | |
379 | struct ethhdr *eth; | |
ee130409 | 380 | static atomic_t ip_ident; |
b3d936f3 | 381 | struct ipv6hdr *ip6h; |
1da177e4 LT |
382 | |
383 | udp_len = len + sizeof(*udph); | |
b3d936f3 CW |
384 | if (np->ipv6) |
385 | ip_len = udp_len + sizeof(*ip6h); | |
386 | else | |
b7394d24 CW |
387 | ip_len = udp_len + sizeof(*iph); |
388 | ||
954fba02 | 389 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 390 | |
954fba02 ED |
391 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
392 | total_len - len); | |
1da177e4 LT |
393 | if (!skb) |
394 | return; | |
395 | ||
27d7ff46 | 396 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 397 | skb_put(skb, len); |
1da177e4 | 398 | |
4bedb452 ACM |
399 | skb_push(skb, sizeof(*udph)); |
400 | skb_reset_transport_header(skb); | |
401 | udph = udp_hdr(skb); | |
1da177e4 LT |
402 | udph->source = htons(np->local_port); |
403 | udph->dest = htons(np->remote_port); | |
404 | udph->len = htons(udp_len); | |
b7394d24 | 405 | |
b3d936f3 CW |
406 | if (np->ipv6) { |
407 | udph->check = 0; | |
408 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
409 | &np->remote_ip.in6, | |
410 | udp_len, IPPROTO_UDP, | |
411 | csum_partial(udph, udp_len, 0)); | |
412 | if (udph->check == 0) | |
413 | udph->check = CSUM_MANGLED_0; | |
414 | ||
415 | skb_push(skb, sizeof(*ip6h)); | |
416 | skb_reset_network_header(skb); | |
417 | ip6h = ipv6_hdr(skb); | |
418 | ||
419 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
420 | put_unaligned(0x60, (unsigned char *)ip6h); | |
421 | ip6h->flow_lbl[0] = 0; | |
422 | ip6h->flow_lbl[1] = 0; | |
423 | ip6h->flow_lbl[2] = 0; | |
424 | ||
425 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
426 | ip6h->nexthdr = IPPROTO_UDP; | |
427 | ip6h->hop_limit = 32; | |
428 | ip6h->saddr = np->local_ip.in6; | |
429 | ip6h->daddr = np->remote_ip.in6; | |
430 | ||
431 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
432 | skb_reset_mac_header(skb); | |
433 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
434 | } else { | |
b7394d24 CW |
435 | udph->check = 0; |
436 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
437 | np->remote_ip.ip, | |
438 | udp_len, IPPROTO_UDP, | |
439 | csum_partial(udph, udp_len, 0)); | |
440 | if (udph->check == 0) | |
441 | udph->check = CSUM_MANGLED_0; | |
442 | ||
443 | skb_push(skb, sizeof(*iph)); | |
444 | skb_reset_network_header(skb); | |
445 | iph = ip_hdr(skb); | |
446 | ||
447 | /* iph->version = 4; iph->ihl = 5; */ | |
448 | put_unaligned(0x45, (unsigned char *)iph); | |
449 | iph->tos = 0; | |
450 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
451 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
452 | iph->frag_off = 0; | |
453 | iph->ttl = 64; | |
454 | iph->protocol = IPPROTO_UDP; | |
455 | iph->check = 0; | |
456 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
457 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
458 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
459 | ||
460 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
461 | skb_reset_mac_header(skb); | |
462 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
463 | } | |
464 | ||
c62326ab JP |
465 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
466 | ether_addr_copy(eth->h_dest, np->remote_mac); | |
1da177e4 LT |
467 | |
468 | skb->dev = np->dev; | |
469 | ||
470 | netpoll_send_skb(np, skb); | |
471 | } | |
9e34a5b5 | 472 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 473 | |
0bcc1816 SS |
474 | void netpoll_print_options(struct netpoll *np) |
475 | { | |
e6ec2693 | 476 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
477 | if (np->ipv6) |
478 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
479 | else | |
b7394d24 | 480 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
481 | np_info(np, "interface '%s'\n", np->dev_name); |
482 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
483 | if (np->ipv6) |
484 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
485 | else | |
b7394d24 | 486 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 487 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 488 | } |
9e34a5b5 | 489 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 490 | |
b7394d24 CW |
491 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
492 | { | |
493 | const char *end; | |
494 | ||
495 | if (!strchr(str, ':') && | |
496 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
497 | if (!*end) | |
498 | return 0; | |
499 | } | |
500 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
501 | #if IS_ENABLED(CONFIG_IPV6) | |
502 | if (!*end) | |
503 | return 1; | |
504 | #else | |
505 | return -1; | |
506 | #endif | |
507 | } | |
508 | return -1; | |
509 | } | |
510 | ||
1da177e4 LT |
511 | int netpoll_parse_options(struct netpoll *np, char *opt) |
512 | { | |
513 | char *cur=opt, *delim; | |
b7394d24 | 514 | int ipv6; |
00fe11b3 | 515 | bool ipversion_set = false; |
1da177e4 | 516 | |
c68b9070 | 517 | if (*cur != '@') { |
1da177e4 LT |
518 | if ((delim = strchr(cur, '@')) == NULL) |
519 | goto parse_failed; | |
c68b9070 | 520 | *delim = 0; |
4b5511eb AP |
521 | if (kstrtou16(cur, 10, &np->local_port)) |
522 | goto parse_failed; | |
c68b9070 | 523 | cur = delim; |
1da177e4 LT |
524 | } |
525 | cur++; | |
1da177e4 | 526 | |
c68b9070 | 527 | if (*cur != '/') { |
00fe11b3 | 528 | ipversion_set = true; |
1da177e4 LT |
529 | if ((delim = strchr(cur, '/')) == NULL) |
530 | goto parse_failed; | |
c68b9070 | 531 | *delim = 0; |
b7394d24 CW |
532 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
533 | if (ipv6 < 0) | |
534 | goto parse_failed; | |
535 | else | |
536 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 537 | cur = delim; |
1da177e4 LT |
538 | } |
539 | cur++; | |
540 | ||
c68b9070 | 541 | if (*cur != ',') { |
1da177e4 LT |
542 | /* parse out dev name */ |
543 | if ((delim = strchr(cur, ',')) == NULL) | |
544 | goto parse_failed; | |
c68b9070 | 545 | *delim = 0; |
1da177e4 | 546 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 547 | cur = delim; |
1da177e4 LT |
548 | } |
549 | cur++; | |
550 | ||
c68b9070 | 551 | if (*cur != '@') { |
1da177e4 LT |
552 | /* dst port */ |
553 | if ((delim = strchr(cur, '@')) == NULL) | |
554 | goto parse_failed; | |
c68b9070 | 555 | *delim = 0; |
5fc05f87 | 556 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 557 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
558 | if (kstrtou16(cur, 10, &np->remote_port)) |
559 | goto parse_failed; | |
c68b9070 | 560 | cur = delim; |
1da177e4 LT |
561 | } |
562 | cur++; | |
1da177e4 LT |
563 | |
564 | /* dst ip */ | |
565 | if ((delim = strchr(cur, '/')) == NULL) | |
566 | goto parse_failed; | |
c68b9070 | 567 | *delim = 0; |
b7394d24 CW |
568 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
569 | if (ipv6 < 0) | |
570 | goto parse_failed; | |
00fe11b3 | 571 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
b7394d24 CW |
572 | goto parse_failed; |
573 | else | |
574 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 575 | cur = delim + 1; |
1da177e4 | 576 | |
c68b9070 | 577 | if (*cur != 0) { |
1da177e4 | 578 | /* MAC address */ |
4940fc88 | 579 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 580 | goto parse_failed; |
1da177e4 LT |
581 | } |
582 | ||
0bcc1816 | 583 | netpoll_print_options(np); |
1da177e4 LT |
584 | |
585 | return 0; | |
586 | ||
587 | parse_failed: | |
e6ec2693 | 588 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
589 | return -1; |
590 | } | |
9e34a5b5 | 591 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 592 | |
a8779ec1 | 593 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
1da177e4 | 594 | { |
115c1d6e | 595 | struct netpoll_info *npinfo; |
4247e161 | 596 | const struct net_device_ops *ops; |
b41848b6 | 597 | int err; |
1da177e4 | 598 | |
30fdd8a0 JP |
599 | np->dev = ndev; |
600 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); | |
2cde6acd | 601 | INIT_WORK(&np->cleanup_work, netpoll_async_cleanup); |
30fdd8a0 | 602 | |
8fdd95ec HX |
603 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
604 | !ndev->netdev_ops->ndo_poll_controller) { | |
e6ec2693 JP |
605 | np_err(np, "%s doesn't support polling, aborting\n", |
606 | np->dev_name); | |
8fdd95ec HX |
607 | err = -ENOTSUPP; |
608 | goto out; | |
609 | } | |
610 | ||
611 | if (!ndev->npinfo) { | |
a8779ec1 | 612 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
8fdd95ec HX |
613 | if (!npinfo) { |
614 | err = -ENOMEM; | |
615 | goto out; | |
616 | } | |
617 | ||
bd7c4b60 | 618 | sema_init(&npinfo->dev_lock, 1); |
8fdd95ec HX |
619 | skb_queue_head_init(&npinfo->txq); |
620 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
621 | ||
622 | atomic_set(&npinfo->refcnt, 1); | |
623 | ||
624 | ops = np->dev->netdev_ops; | |
625 | if (ops->ndo_netpoll_setup) { | |
a8779ec1 | 626 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
8fdd95ec HX |
627 | if (err) |
628 | goto free_npinfo; | |
629 | } | |
630 | } else { | |
0790bbb6 | 631 | npinfo = rtnl_dereference(ndev->npinfo); |
8fdd95ec HX |
632 | atomic_inc(&npinfo->refcnt); |
633 | } | |
634 | ||
635 | npinfo->netpoll = np; | |
636 | ||
8fdd95ec | 637 | /* last thing to do is link it to the net device structure */ |
cf778b00 | 638 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
639 | |
640 | return 0; | |
641 | ||
642 | free_npinfo: | |
643 | kfree(npinfo); | |
644 | out: | |
645 | return err; | |
646 | } | |
647 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
648 | ||
649 | int netpoll_setup(struct netpoll *np) | |
650 | { | |
651 | struct net_device *ndev = NULL; | |
652 | struct in_device *in_dev; | |
653 | int err; | |
654 | ||
f92d3180 | 655 | rtnl_lock(); |
556e6256 CW |
656 | if (np->dev_name) { |
657 | struct net *net = current->nsproxy->net_ns; | |
658 | ndev = __dev_get_by_name(net, np->dev_name); | |
659 | } | |
1da177e4 | 660 | if (!ndev) { |
e6ec2693 | 661 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
662 | err = -ENODEV; |
663 | goto unlock; | |
1da177e4 | 664 | } |
5bd30d39 | 665 | dev_hold(ndev); |
1da177e4 | 666 | |
49bd8fb0 | 667 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 668 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
669 | err = -EBUSY; |
670 | goto put; | |
0c1ad04a WC |
671 | } |
672 | ||
1da177e4 LT |
673 | if (!netif_running(ndev)) { |
674 | unsigned long atmost, atleast; | |
675 | ||
e6ec2693 | 676 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 677 | |
b41848b6 | 678 | err = dev_open(ndev); |
b41848b6 SH |
679 | |
680 | if (err) { | |
e6ec2693 | 681 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 682 | goto put; |
1da177e4 | 683 | } |
1da177e4 | 684 | |
f92d3180 | 685 | rtnl_unlock(); |
1da177e4 | 686 | atleast = jiffies + HZ/10; |
bff38771 | 687 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
688 | while (!netif_carrier_ok(ndev)) { |
689 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 690 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
691 | break; |
692 | } | |
1b614fb9 | 693 | msleep(1); |
1da177e4 LT |
694 | } |
695 | ||
696 | /* If carrier appears to come up instantly, we don't | |
697 | * trust it and pause so that we don't pump all our | |
698 | * queued console messages into the bitbucket. | |
699 | */ | |
700 | ||
701 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 702 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
703 | msleep(4000); |
704 | } | |
f92d3180 | 705 | rtnl_lock(); |
1da177e4 LT |
706 | } |
707 | ||
b7394d24 CW |
708 | if (!np->local_ip.ip) { |
709 | if (!np->ipv6) { | |
f92d3180 | 710 | in_dev = __in_dev_get_rtnl(ndev); |
b7394d24 CW |
711 | |
712 | if (!in_dev || !in_dev->ifa_list) { | |
b7394d24 CW |
713 | np_err(np, "no IP address for %s, aborting\n", |
714 | np->dev_name); | |
715 | err = -EDESTADDRREQ; | |
716 | goto put; | |
717 | } | |
718 | ||
719 | np->local_ip.ip = in_dev->ifa_list->ifa_local; | |
b7394d24 | 720 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
721 | } else { |
722 | #if IS_ENABLED(CONFIG_IPV6) | |
723 | struct inet6_dev *idev; | |
724 | ||
725 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
726 | idev = __in6_dev_get(ndev); |
727 | if (idev) { | |
728 | struct inet6_ifaddr *ifp; | |
729 | ||
730 | read_lock_bh(&idev->lock); | |
731 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
732 | if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) | |
733 | continue; | |
734 | np->local_ip.in6 = ifp->addr; | |
735 | err = 0; | |
736 | break; | |
737 | } | |
738 | read_unlock_bh(&idev->lock); | |
739 | } | |
b3d936f3 CW |
740 | if (err) { |
741 | np_err(np, "no IPv6 address for %s, aborting\n", | |
742 | np->dev_name); | |
743 | goto put; | |
744 | } else | |
745 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
746 | #else | |
747 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
748 | np->dev_name); | |
e39363a9 | 749 | err = -EINVAL; |
b3d936f3 CW |
750 | goto put; |
751 | #endif | |
1da177e4 | 752 | } |
1da177e4 LT |
753 | } |
754 | ||
dbaa1541 HX |
755 | /* fill up the skb queue */ |
756 | refill_skbs(); | |
757 | ||
a8779ec1 | 758 | err = __netpoll_setup(np, ndev); |
8fdd95ec HX |
759 | if (err) |
760 | goto put; | |
761 | ||
f92d3180 | 762 | rtnl_unlock(); |
1da177e4 LT |
763 | return 0; |
764 | ||
21edbb22 | 765 | put: |
1da177e4 | 766 | dev_put(ndev); |
f92d3180 CW |
767 | unlock: |
768 | rtnl_unlock(); | |
b41848b6 | 769 | return err; |
1da177e4 | 770 | } |
9e34a5b5 | 771 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 772 | |
c68b9070 DM |
773 | static int __init netpoll_init(void) |
774 | { | |
a1bcfacd SH |
775 | skb_queue_head_init(&skb_pool); |
776 | return 0; | |
777 | } | |
778 | core_initcall(netpoll_init); | |
779 | ||
38e6bc18 AW |
780 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
781 | { | |
782 | struct netpoll_info *npinfo = | |
783 | container_of(rcu_head, struct netpoll_info, rcu); | |
784 | ||
38e6bc18 AW |
785 | skb_queue_purge(&npinfo->txq); |
786 | ||
787 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
788 | cancel_delayed_work(&npinfo->tx_work); | |
789 | ||
790 | /* clean after last, unfinished work */ | |
791 | __skb_queue_purge(&npinfo->txq); | |
792 | /* now cancel it again */ | |
793 | cancel_delayed_work(&npinfo->tx_work); | |
794 | kfree(npinfo); | |
795 | } | |
796 | ||
8fdd95ec | 797 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 798 | { |
fbeec2e1 | 799 | struct netpoll_info *npinfo; |
fbeec2e1 | 800 | |
0790bbb6 NH |
801 | /* rtnl_dereference would be preferable here but |
802 | * rcu_cleanup_netpoll path can put us in here safely without | |
803 | * holding the rtnl, so plain rcu_dereference it is | |
804 | */ | |
805 | npinfo = rtnl_dereference(np->dev->npinfo); | |
8fdd95ec | 806 | if (!npinfo) |
dbaa1541 | 807 | return; |
93ec2c72 | 808 | |
ca99ca14 NH |
809 | synchronize_srcu(&netpoll_srcu); |
810 | ||
8fdd95ec HX |
811 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
812 | const struct net_device_ops *ops; | |
de85d99e | 813 | |
8fdd95ec HX |
814 | ops = np->dev->netdev_ops; |
815 | if (ops->ndo_netpoll_cleanup) | |
816 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 817 | |
fcb144b5 | 818 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
38e6bc18 | 819 | call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); |
efa95b01 | 820 | } else |
821 | RCU_INIT_POINTER(np->dev->npinfo, NULL); | |
38e6bc18 AW |
822 | } |
823 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 824 | |
2cde6acd | 825 | static void netpoll_async_cleanup(struct work_struct *work) |
38e6bc18 | 826 | { |
2cde6acd | 827 | struct netpoll *np = container_of(work, struct netpoll, cleanup_work); |
93ec2c72 | 828 | |
2cde6acd | 829 | rtnl_lock(); |
38e6bc18 | 830 | __netpoll_cleanup(np); |
2cde6acd | 831 | rtnl_unlock(); |
38e6bc18 AW |
832 | kfree(np); |
833 | } | |
93ec2c72 | 834 | |
2cde6acd | 835 | void __netpoll_free_async(struct netpoll *np) |
38e6bc18 | 836 | { |
2cde6acd | 837 | schedule_work(&np->cleanup_work); |
8fdd95ec | 838 | } |
2cde6acd | 839 | EXPORT_SYMBOL_GPL(__netpoll_free_async); |
fbeec2e1 | 840 | |
8fdd95ec HX |
841 | void netpoll_cleanup(struct netpoll *np) |
842 | { | |
8fdd95ec | 843 | rtnl_lock(); |
d0fe8c88 NA |
844 | if (!np->dev) |
845 | goto out; | |
8fdd95ec | 846 | __netpoll_cleanup(np); |
8fdd95ec | 847 | dev_put(np->dev); |
1da177e4 | 848 | np->dev = NULL; |
d0fe8c88 NA |
849 | out: |
850 | rtnl_unlock(); | |
1da177e4 | 851 | } |
9e34a5b5 | 852 | EXPORT_SYMBOL(netpoll_cleanup); |