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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 | ||
80 | if (vlan_tx_tag_present(skb) && | |
81 | !vlan_hw_offload_capable(features, skb->vlan_proto)) { | |
62749e2c JP |
82 | skb = vlan_insert_tag_set_proto(skb, skb->vlan_proto, |
83 | vlan_tx_tag_get(skb)); | |
944e2948 EB |
84 | if (unlikely(!skb)) { |
85 | /* This is actually a packet drop, but we | |
86 | * don't want the code that calls this | |
87 | * function to try and operate on a NULL skb. | |
88 | */ | |
89 | goto out; | |
90 | } | |
91 | skb->vlan_tci = 0; | |
92 | } | |
93 | ||
fa2dbdc2 | 94 | status = netdev_start_xmit(skb, dev, txq, false); |
944e2948 EB |
95 | |
96 | out: | |
97 | return status; | |
98 | } | |
99 | ||
c4028958 | 100 | static void queue_process(struct work_struct *work) |
1da177e4 | 101 | { |
4c1ac1b4 DH |
102 | struct netpoll_info *npinfo = |
103 | container_of(work, struct netpoll_info, tx_work.work); | |
1da177e4 | 104 | struct sk_buff *skb; |
3640543d | 105 | unsigned long flags; |
1da177e4 | 106 | |
6c43ff18 SH |
107 | while ((skb = skb_dequeue(&npinfo->txq))) { |
108 | struct net_device *dev = skb->dev; | |
fd2ea0a7 | 109 | struct netdev_queue *txq; |
1da177e4 | 110 | |
6c43ff18 | 111 | if (!netif_device_present(dev) || !netif_running(dev)) { |
080b3c19 | 112 | kfree_skb(skb); |
6c43ff18 SH |
113 | continue; |
114 | } | |
1da177e4 | 115 | |
10c51b56 | 116 | txq = skb_get_tx_queue(dev, skb); |
fd2ea0a7 | 117 | |
3640543d | 118 | local_irq_save(flags); |
5efeac44 | 119 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
73466498 | 120 | if (netif_xmit_frozen_or_stopped(txq) || |
944e2948 | 121 | netpoll_start_xmit(skb, dev, txq) != NETDEV_TX_OK) { |
6c43ff18 | 122 | skb_queue_head(&npinfo->txq, skb); |
5efeac44 | 123 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 124 | local_irq_restore(flags); |
1da177e4 | 125 | |
25442caf | 126 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
127 | return; |
128 | } | |
5efeac44 | 129 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 130 | local_irq_restore(flags); |
1da177e4 | 131 | } |
1da177e4 LT |
132 | } |
133 | ||
1da177e4 LT |
134 | /* |
135 | * Check whether delayed processing was scheduled for our NIC. If so, | |
136 | * we attempt to grab the poll lock and use ->poll() to pump the card. | |
137 | * If this fails, either we've recursed in ->poll() or it's already | |
138 | * running on another CPU. | |
139 | * | |
140 | * Note: we don't mask interrupts with this lock because we're using | |
141 | * trylock here and interrupts are already disabled in the softirq | |
142 | * case. Further, we test the poll_owner to avoid recursion on UP | |
143 | * systems where the lock doesn't exist. | |
1da177e4 | 144 | */ |
b249b51b | 145 | static int poll_one_napi(struct napi_struct *napi, int budget) |
0a7606c1 DM |
146 | { |
147 | int work; | |
148 | ||
149 | /* net_rx_action's ->poll() invocations and our's are | |
150 | * synchronized by this test which is only made while | |
151 | * holding the napi->poll_lock. | |
152 | */ | |
153 | if (!test_bit(NAPI_STATE_SCHED, &napi->state)) | |
154 | return budget; | |
155 | ||
7b363e44 | 156 | set_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
157 | |
158 | work = napi->poll(napi, budget); | |
e97dc3fc | 159 | WARN_ONCE(work > budget, "%pF exceeded budget in poll\n", napi->poll); |
7d18f114 | 160 | trace_napi_poll(napi); |
0a7606c1 | 161 | |
7b363e44 | 162 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
163 | |
164 | return budget - work; | |
165 | } | |
166 | ||
9852fbec | 167 | static void poll_napi(struct net_device *dev, int budget) |
1da177e4 | 168 | { |
bea3348e | 169 | struct napi_struct *napi; |
1da177e4 | 170 | |
f13d493d | 171 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
0a7606c1 | 172 | if (napi->poll_owner != smp_processor_id() && |
bea3348e | 173 | spin_trylock(&napi->poll_lock)) { |
b249b51b | 174 | budget = poll_one_napi(napi, budget); |
bea3348e SH |
175 | spin_unlock(&napi->poll_lock); |
176 | } | |
1da177e4 LT |
177 | } |
178 | } | |
179 | ||
234b921d | 180 | static void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 181 | { |
5e392739 | 182 | const struct net_device_ops *ops; |
2899656b | 183 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
9c62a68d | 184 | int budget = 0; |
5106930b | 185 | |
ca99ca14 NH |
186 | /* Don't do any rx activity if the dev_lock mutex is held |
187 | * the dev_open/close paths use this to block netpoll activity | |
188 | * while changing device state | |
189 | */ | |
a3dbbc2b | 190 | if (down_trylock(&ni->dev_lock)) |
ca99ca14 NH |
191 | return; |
192 | ||
959d5fde | 193 | if (!netif_running(dev)) { |
bd7c4b60 | 194 | up(&ni->dev_lock); |
5e392739 | 195 | return; |
959d5fde | 196 | } |
5e392739 PE |
197 | |
198 | ops = dev->netdev_ops; | |
959d5fde | 199 | if (!ops->ndo_poll_controller) { |
bd7c4b60 | 200 | up(&ni->dev_lock); |
1da177e4 | 201 | return; |
959d5fde | 202 | } |
1da177e4 LT |
203 | |
204 | /* Process pending work on NIC */ | |
d314774c | 205 | ops->ndo_poll_controller(dev); |
5106930b | 206 | |
9852fbec | 207 | poll_napi(dev, budget); |
1da177e4 | 208 | |
bd7c4b60 | 209 | up(&ni->dev_lock); |
ca99ca14 | 210 | |
3578b0c8 | 211 | zap_completion_queue(); |
1da177e4 LT |
212 | } |
213 | ||
66b5552f | 214 | void netpoll_poll_disable(struct net_device *dev) |
ca99ca14 NH |
215 | { |
216 | struct netpoll_info *ni; | |
217 | int idx; | |
218 | might_sleep(); | |
219 | idx = srcu_read_lock(&netpoll_srcu); | |
220 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
221 | if (ni) | |
bd7c4b60 | 222 | down(&ni->dev_lock); |
ca99ca14 | 223 | srcu_read_unlock(&netpoll_srcu, idx); |
ca99ca14 | 224 | } |
66b5552f | 225 | EXPORT_SYMBOL(netpoll_poll_disable); |
ca99ca14 | 226 | |
66b5552f | 227 | void netpoll_poll_enable(struct net_device *dev) |
ca99ca14 NH |
228 | { |
229 | struct netpoll_info *ni; | |
230 | rcu_read_lock(); | |
231 | ni = rcu_dereference(dev->npinfo); | |
232 | if (ni) | |
bd7c4b60 | 233 | up(&ni->dev_lock); |
ca99ca14 NH |
234 | rcu_read_unlock(); |
235 | } | |
66b5552f | 236 | EXPORT_SYMBOL(netpoll_poll_enable); |
ca99ca14 | 237 | |
1da177e4 LT |
238 | static void refill_skbs(void) |
239 | { | |
240 | struct sk_buff *skb; | |
241 | unsigned long flags; | |
242 | ||
a1bcfacd SH |
243 | spin_lock_irqsave(&skb_pool.lock, flags); |
244 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
245 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
246 | if (!skb) | |
247 | break; | |
248 | ||
a1bcfacd | 249 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 250 | } |
a1bcfacd | 251 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
252 | } |
253 | ||
3578b0c8 DM |
254 | static void zap_completion_queue(void) |
255 | { | |
256 | unsigned long flags; | |
257 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
258 | ||
259 | if (sd->completion_queue) { | |
260 | struct sk_buff *clist; | |
261 | ||
262 | local_irq_save(flags); | |
263 | clist = sd->completion_queue; | |
264 | sd->completion_queue = NULL; | |
265 | local_irq_restore(flags); | |
266 | ||
267 | while (clist != NULL) { | |
268 | struct sk_buff *skb = clist; | |
269 | clist = clist->next; | |
b1586f09 | 270 | if (!skb_irq_freeable(skb)) { |
3578b0c8 DM |
271 | atomic_inc(&skb->users); |
272 | dev_kfree_skb_any(skb); /* put this one back */ | |
273 | } else { | |
274 | __kfree_skb(skb); | |
275 | } | |
276 | } | |
277 | } | |
278 | ||
279 | put_cpu_var(softnet_data); | |
280 | } | |
281 | ||
a1bcfacd | 282 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 283 | { |
a1bcfacd SH |
284 | int count = 0; |
285 | struct sk_buff *skb; | |
1da177e4 | 286 | |
3578b0c8 | 287 | zap_completion_queue(); |
a1bcfacd | 288 | refill_skbs(); |
1da177e4 | 289 | repeat: |
1da177e4 LT |
290 | |
291 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
292 | if (!skb) |
293 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
294 | |
295 | if (!skb) { | |
a1bcfacd | 296 | if (++count < 10) { |
2a49e001 | 297 | netpoll_poll_dev(np->dev); |
a1bcfacd | 298 | goto repeat; |
1da177e4 | 299 | } |
a1bcfacd | 300 | return NULL; |
1da177e4 LT |
301 | } |
302 | ||
303 | atomic_set(&skb->users, 1); | |
304 | skb_reserve(skb, reserve); | |
305 | return skb; | |
306 | } | |
307 | ||
bea3348e SH |
308 | static int netpoll_owner_active(struct net_device *dev) |
309 | { | |
310 | struct napi_struct *napi; | |
311 | ||
312 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
313 | if (napi->poll_owner == smp_processor_id()) | |
314 | return 1; | |
315 | } | |
316 | return 0; | |
317 | } | |
318 | ||
2899656b | 319 | /* call with IRQ disabled */ |
c2355e1a NH |
320 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
321 | struct net_device *dev) | |
1da177e4 | 322 | { |
2bdfe0ba SH |
323 | int status = NETDEV_TX_BUSY; |
324 | unsigned long tries; | |
de85d99e | 325 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 326 | struct netpoll_info *npinfo; |
2bdfe0ba | 327 | |
2899656b AW |
328 | WARN_ON_ONCE(!irqs_disabled()); |
329 | ||
330 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb | 331 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
080b3c19 | 332 | dev_kfree_skb_irq(skb); |
4ec93edb YH |
333 | return; |
334 | } | |
2bdfe0ba SH |
335 | |
336 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 337 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 338 | struct netdev_queue *txq; |
a49f99ff | 339 | |
f663dd9a | 340 | txq = netdev_pick_tx(dev, skb, NULL); |
fd2ea0a7 | 341 | |
0db3dc73 SH |
342 | /* try until next clock tick */ |
343 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
344 | tries > 0; --tries) { | |
5efeac44 | 345 | if (HARD_TX_TRYLOCK(dev, txq)) { |
944e2948 EB |
346 | if (!netif_xmit_stopped(txq)) |
347 | status = netpoll_start_xmit(skb, dev, txq); | |
348 | ||
5efeac44 | 349 | HARD_TX_UNLOCK(dev, txq); |
e37b8d93 AM |
350 | |
351 | if (status == NETDEV_TX_OK) | |
352 | break; | |
353 | ||
e37b8d93 | 354 | } |
0db3dc73 SH |
355 | |
356 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 357 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
358 | |
359 | udelay(USEC_PER_POLL); | |
0db1d6fc | 360 | } |
79b1bee8 DD |
361 | |
362 | WARN_ONCE(!irqs_disabled(), | |
2899656b | 363 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pF)\n", |
944e2948 | 364 | dev->name, dev->netdev_ops->ndo_start_xmit); |
79b1bee8 | 365 | |
1da177e4 | 366 | } |
1da177e4 | 367 | |
2bdfe0ba | 368 | if (status != NETDEV_TX_OK) { |
5de4a473 | 369 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 370 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 371 | } |
1da177e4 | 372 | } |
c2355e1a | 373 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
374 | |
375 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
376 | { | |
954fba02 | 377 | int total_len, ip_len, udp_len; |
1da177e4 LT |
378 | struct sk_buff *skb; |
379 | struct udphdr *udph; | |
380 | struct iphdr *iph; | |
381 | struct ethhdr *eth; | |
ee130409 | 382 | static atomic_t ip_ident; |
b3d936f3 | 383 | struct ipv6hdr *ip6h; |
1da177e4 LT |
384 | |
385 | udp_len = len + sizeof(*udph); | |
b3d936f3 CW |
386 | if (np->ipv6) |
387 | ip_len = udp_len + sizeof(*ip6h); | |
388 | else | |
b7394d24 CW |
389 | ip_len = udp_len + sizeof(*iph); |
390 | ||
954fba02 | 391 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 392 | |
954fba02 ED |
393 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
394 | total_len - len); | |
1da177e4 LT |
395 | if (!skb) |
396 | return; | |
397 | ||
27d7ff46 | 398 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 399 | skb_put(skb, len); |
1da177e4 | 400 | |
4bedb452 ACM |
401 | skb_push(skb, sizeof(*udph)); |
402 | skb_reset_transport_header(skb); | |
403 | udph = udp_hdr(skb); | |
1da177e4 LT |
404 | udph->source = htons(np->local_port); |
405 | udph->dest = htons(np->remote_port); | |
406 | udph->len = htons(udp_len); | |
b7394d24 | 407 | |
b3d936f3 CW |
408 | if (np->ipv6) { |
409 | udph->check = 0; | |
410 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
411 | &np->remote_ip.in6, | |
412 | udp_len, IPPROTO_UDP, | |
413 | csum_partial(udph, udp_len, 0)); | |
414 | if (udph->check == 0) | |
415 | udph->check = CSUM_MANGLED_0; | |
416 | ||
417 | skb_push(skb, sizeof(*ip6h)); | |
418 | skb_reset_network_header(skb); | |
419 | ip6h = ipv6_hdr(skb); | |
420 | ||
421 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
422 | put_unaligned(0x60, (unsigned char *)ip6h); | |
423 | ip6h->flow_lbl[0] = 0; | |
424 | ip6h->flow_lbl[1] = 0; | |
425 | ip6h->flow_lbl[2] = 0; | |
426 | ||
427 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
428 | ip6h->nexthdr = IPPROTO_UDP; | |
429 | ip6h->hop_limit = 32; | |
430 | ip6h->saddr = np->local_ip.in6; | |
431 | ip6h->daddr = np->remote_ip.in6; | |
432 | ||
433 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
434 | skb_reset_mac_header(skb); | |
435 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
436 | } else { | |
b7394d24 CW |
437 | udph->check = 0; |
438 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
439 | np->remote_ip.ip, | |
440 | udp_len, IPPROTO_UDP, | |
441 | csum_partial(udph, udp_len, 0)); | |
442 | if (udph->check == 0) | |
443 | udph->check = CSUM_MANGLED_0; | |
444 | ||
445 | skb_push(skb, sizeof(*iph)); | |
446 | skb_reset_network_header(skb); | |
447 | iph = ip_hdr(skb); | |
448 | ||
449 | /* iph->version = 4; iph->ihl = 5; */ | |
450 | put_unaligned(0x45, (unsigned char *)iph); | |
451 | iph->tos = 0; | |
452 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
453 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
454 | iph->frag_off = 0; | |
455 | iph->ttl = 64; | |
456 | iph->protocol = IPPROTO_UDP; | |
457 | iph->check = 0; | |
458 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
459 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
460 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
461 | ||
462 | eth = (struct ethhdr *) skb_push(skb, ETH_HLEN); | |
463 | skb_reset_mac_header(skb); | |
464 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
465 | } | |
466 | ||
c62326ab JP |
467 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
468 | ether_addr_copy(eth->h_dest, np->remote_mac); | |
1da177e4 LT |
469 | |
470 | skb->dev = np->dev; | |
471 | ||
472 | netpoll_send_skb(np, skb); | |
473 | } | |
9e34a5b5 | 474 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 475 | |
0bcc1816 SS |
476 | void netpoll_print_options(struct netpoll *np) |
477 | { | |
e6ec2693 | 478 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
479 | if (np->ipv6) |
480 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
481 | else | |
b7394d24 | 482 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
483 | np_info(np, "interface '%s'\n", np->dev_name); |
484 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
485 | if (np->ipv6) |
486 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
487 | else | |
b7394d24 | 488 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 489 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 490 | } |
9e34a5b5 | 491 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 492 | |
b7394d24 CW |
493 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
494 | { | |
495 | const char *end; | |
496 | ||
497 | if (!strchr(str, ':') && | |
498 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
499 | if (!*end) | |
500 | return 0; | |
501 | } | |
502 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
503 | #if IS_ENABLED(CONFIG_IPV6) | |
504 | if (!*end) | |
505 | return 1; | |
506 | #else | |
507 | return -1; | |
508 | #endif | |
509 | } | |
510 | return -1; | |
511 | } | |
512 | ||
1da177e4 LT |
513 | int netpoll_parse_options(struct netpoll *np, char *opt) |
514 | { | |
515 | char *cur=opt, *delim; | |
b7394d24 | 516 | int ipv6; |
00fe11b3 | 517 | bool ipversion_set = false; |
1da177e4 | 518 | |
c68b9070 | 519 | if (*cur != '@') { |
1da177e4 LT |
520 | if ((delim = strchr(cur, '@')) == NULL) |
521 | goto parse_failed; | |
c68b9070 | 522 | *delim = 0; |
4b5511eb AP |
523 | if (kstrtou16(cur, 10, &np->local_port)) |
524 | goto parse_failed; | |
c68b9070 | 525 | cur = delim; |
1da177e4 LT |
526 | } |
527 | cur++; | |
1da177e4 | 528 | |
c68b9070 | 529 | if (*cur != '/') { |
00fe11b3 | 530 | ipversion_set = true; |
1da177e4 LT |
531 | if ((delim = strchr(cur, '/')) == NULL) |
532 | goto parse_failed; | |
c68b9070 | 533 | *delim = 0; |
b7394d24 CW |
534 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
535 | if (ipv6 < 0) | |
536 | goto parse_failed; | |
537 | else | |
538 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 539 | cur = delim; |
1da177e4 LT |
540 | } |
541 | cur++; | |
542 | ||
c68b9070 | 543 | if (*cur != ',') { |
1da177e4 LT |
544 | /* parse out dev name */ |
545 | if ((delim = strchr(cur, ',')) == NULL) | |
546 | goto parse_failed; | |
c68b9070 | 547 | *delim = 0; |
1da177e4 | 548 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 549 | cur = delim; |
1da177e4 LT |
550 | } |
551 | cur++; | |
552 | ||
c68b9070 | 553 | if (*cur != '@') { |
1da177e4 LT |
554 | /* dst port */ |
555 | if ((delim = strchr(cur, '@')) == NULL) | |
556 | goto parse_failed; | |
c68b9070 | 557 | *delim = 0; |
5fc05f87 | 558 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 559 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
560 | if (kstrtou16(cur, 10, &np->remote_port)) |
561 | goto parse_failed; | |
c68b9070 | 562 | cur = delim; |
1da177e4 LT |
563 | } |
564 | cur++; | |
1da177e4 LT |
565 | |
566 | /* dst ip */ | |
567 | if ((delim = strchr(cur, '/')) == NULL) | |
568 | goto parse_failed; | |
c68b9070 | 569 | *delim = 0; |
b7394d24 CW |
570 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
571 | if (ipv6 < 0) | |
572 | goto parse_failed; | |
00fe11b3 | 573 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
b7394d24 CW |
574 | goto parse_failed; |
575 | else | |
576 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 577 | cur = delim + 1; |
1da177e4 | 578 | |
c68b9070 | 579 | if (*cur != 0) { |
1da177e4 | 580 | /* MAC address */ |
4940fc88 | 581 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 582 | goto parse_failed; |
1da177e4 LT |
583 | } |
584 | ||
0bcc1816 | 585 | netpoll_print_options(np); |
1da177e4 LT |
586 | |
587 | return 0; | |
588 | ||
589 | parse_failed: | |
e6ec2693 | 590 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
591 | return -1; |
592 | } | |
9e34a5b5 | 593 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 594 | |
a8779ec1 | 595 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
1da177e4 | 596 | { |
115c1d6e | 597 | struct netpoll_info *npinfo; |
4247e161 | 598 | const struct net_device_ops *ops; |
b41848b6 | 599 | int err; |
1da177e4 | 600 | |
30fdd8a0 JP |
601 | np->dev = ndev; |
602 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); | |
2cde6acd | 603 | INIT_WORK(&np->cleanup_work, netpoll_async_cleanup); |
30fdd8a0 | 604 | |
8fdd95ec HX |
605 | if ((ndev->priv_flags & IFF_DISABLE_NETPOLL) || |
606 | !ndev->netdev_ops->ndo_poll_controller) { | |
e6ec2693 JP |
607 | np_err(np, "%s doesn't support polling, aborting\n", |
608 | np->dev_name); | |
8fdd95ec HX |
609 | err = -ENOTSUPP; |
610 | goto out; | |
611 | } | |
612 | ||
613 | if (!ndev->npinfo) { | |
a8779ec1 | 614 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
8fdd95ec HX |
615 | if (!npinfo) { |
616 | err = -ENOMEM; | |
617 | goto out; | |
618 | } | |
619 | ||
bd7c4b60 | 620 | sema_init(&npinfo->dev_lock, 1); |
8fdd95ec HX |
621 | skb_queue_head_init(&npinfo->txq); |
622 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
623 | ||
624 | atomic_set(&npinfo->refcnt, 1); | |
625 | ||
626 | ops = np->dev->netdev_ops; | |
627 | if (ops->ndo_netpoll_setup) { | |
a8779ec1 | 628 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
8fdd95ec HX |
629 | if (err) |
630 | goto free_npinfo; | |
631 | } | |
632 | } else { | |
0790bbb6 | 633 | npinfo = rtnl_dereference(ndev->npinfo); |
8fdd95ec HX |
634 | atomic_inc(&npinfo->refcnt); |
635 | } | |
636 | ||
637 | npinfo->netpoll = np; | |
638 | ||
8fdd95ec | 639 | /* last thing to do is link it to the net device structure */ |
cf778b00 | 640 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
641 | |
642 | return 0; | |
643 | ||
644 | free_npinfo: | |
645 | kfree(npinfo); | |
646 | out: | |
647 | return err; | |
648 | } | |
649 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
650 | ||
651 | int netpoll_setup(struct netpoll *np) | |
652 | { | |
653 | struct net_device *ndev = NULL; | |
654 | struct in_device *in_dev; | |
655 | int err; | |
656 | ||
f92d3180 | 657 | rtnl_lock(); |
556e6256 CW |
658 | if (np->dev_name) { |
659 | struct net *net = current->nsproxy->net_ns; | |
660 | ndev = __dev_get_by_name(net, np->dev_name); | |
661 | } | |
1da177e4 | 662 | if (!ndev) { |
e6ec2693 | 663 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
664 | err = -ENODEV; |
665 | goto unlock; | |
1da177e4 | 666 | } |
5bd30d39 | 667 | dev_hold(ndev); |
1da177e4 | 668 | |
49bd8fb0 | 669 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 670 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
671 | err = -EBUSY; |
672 | goto put; | |
0c1ad04a WC |
673 | } |
674 | ||
1da177e4 LT |
675 | if (!netif_running(ndev)) { |
676 | unsigned long atmost, atleast; | |
677 | ||
e6ec2693 | 678 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 679 | |
b41848b6 | 680 | err = dev_open(ndev); |
b41848b6 SH |
681 | |
682 | if (err) { | |
e6ec2693 | 683 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 684 | goto put; |
1da177e4 | 685 | } |
1da177e4 | 686 | |
f92d3180 | 687 | rtnl_unlock(); |
1da177e4 | 688 | atleast = jiffies + HZ/10; |
bff38771 | 689 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
690 | while (!netif_carrier_ok(ndev)) { |
691 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 692 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
693 | break; |
694 | } | |
1b614fb9 | 695 | msleep(1); |
1da177e4 LT |
696 | } |
697 | ||
698 | /* If carrier appears to come up instantly, we don't | |
699 | * trust it and pause so that we don't pump all our | |
700 | * queued console messages into the bitbucket. | |
701 | */ | |
702 | ||
703 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 704 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
705 | msleep(4000); |
706 | } | |
f92d3180 | 707 | rtnl_lock(); |
1da177e4 LT |
708 | } |
709 | ||
b7394d24 CW |
710 | if (!np->local_ip.ip) { |
711 | if (!np->ipv6) { | |
f92d3180 | 712 | in_dev = __in_dev_get_rtnl(ndev); |
b7394d24 CW |
713 | |
714 | if (!in_dev || !in_dev->ifa_list) { | |
b7394d24 CW |
715 | np_err(np, "no IP address for %s, aborting\n", |
716 | np->dev_name); | |
717 | err = -EDESTADDRREQ; | |
718 | goto put; | |
719 | } | |
720 | ||
721 | np->local_ip.ip = in_dev->ifa_list->ifa_local; | |
b7394d24 | 722 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
723 | } else { |
724 | #if IS_ENABLED(CONFIG_IPV6) | |
725 | struct inet6_dev *idev; | |
726 | ||
727 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
728 | idev = __in6_dev_get(ndev); |
729 | if (idev) { | |
730 | struct inet6_ifaddr *ifp; | |
731 | ||
732 | read_lock_bh(&idev->lock); | |
733 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
734 | if (ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) | |
735 | continue; | |
736 | np->local_ip.in6 = ifp->addr; | |
737 | err = 0; | |
738 | break; | |
739 | } | |
740 | read_unlock_bh(&idev->lock); | |
741 | } | |
b3d936f3 CW |
742 | if (err) { |
743 | np_err(np, "no IPv6 address for %s, aborting\n", | |
744 | np->dev_name); | |
745 | goto put; | |
746 | } else | |
747 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
748 | #else | |
749 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
750 | np->dev_name); | |
e39363a9 | 751 | err = -EINVAL; |
b3d936f3 CW |
752 | goto put; |
753 | #endif | |
1da177e4 | 754 | } |
1da177e4 LT |
755 | } |
756 | ||
dbaa1541 HX |
757 | /* fill up the skb queue */ |
758 | refill_skbs(); | |
759 | ||
a8779ec1 | 760 | err = __netpoll_setup(np, ndev); |
8fdd95ec HX |
761 | if (err) |
762 | goto put; | |
763 | ||
f92d3180 | 764 | rtnl_unlock(); |
1da177e4 LT |
765 | return 0; |
766 | ||
21edbb22 | 767 | put: |
1da177e4 | 768 | dev_put(ndev); |
f92d3180 CW |
769 | unlock: |
770 | rtnl_unlock(); | |
b41848b6 | 771 | return err; |
1da177e4 | 772 | } |
9e34a5b5 | 773 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 774 | |
c68b9070 DM |
775 | static int __init netpoll_init(void) |
776 | { | |
a1bcfacd SH |
777 | skb_queue_head_init(&skb_pool); |
778 | return 0; | |
779 | } | |
780 | core_initcall(netpoll_init); | |
781 | ||
38e6bc18 AW |
782 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
783 | { | |
784 | struct netpoll_info *npinfo = | |
785 | container_of(rcu_head, struct netpoll_info, rcu); | |
786 | ||
38e6bc18 AW |
787 | skb_queue_purge(&npinfo->txq); |
788 | ||
789 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
790 | cancel_delayed_work(&npinfo->tx_work); | |
791 | ||
792 | /* clean after last, unfinished work */ | |
793 | __skb_queue_purge(&npinfo->txq); | |
794 | /* now cancel it again */ | |
795 | cancel_delayed_work(&npinfo->tx_work); | |
796 | kfree(npinfo); | |
797 | } | |
798 | ||
8fdd95ec | 799 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 800 | { |
fbeec2e1 | 801 | struct netpoll_info *npinfo; |
fbeec2e1 | 802 | |
0790bbb6 NH |
803 | /* rtnl_dereference would be preferable here but |
804 | * rcu_cleanup_netpoll path can put us in here safely without | |
805 | * holding the rtnl, so plain rcu_dereference it is | |
806 | */ | |
807 | npinfo = rtnl_dereference(np->dev->npinfo); | |
8fdd95ec | 808 | if (!npinfo) |
dbaa1541 | 809 | return; |
93ec2c72 | 810 | |
ca99ca14 NH |
811 | synchronize_srcu(&netpoll_srcu); |
812 | ||
8fdd95ec HX |
813 | if (atomic_dec_and_test(&npinfo->refcnt)) { |
814 | const struct net_device_ops *ops; | |
de85d99e | 815 | |
8fdd95ec HX |
816 | ops = np->dev->netdev_ops; |
817 | if (ops->ndo_netpoll_cleanup) | |
818 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 819 | |
fcb144b5 | 820 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
38e6bc18 | 821 | call_rcu_bh(&npinfo->rcu, rcu_cleanup_netpoll_info); |
efa95b01 | 822 | } else |
823 | RCU_INIT_POINTER(np->dev->npinfo, NULL); | |
38e6bc18 AW |
824 | } |
825 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 826 | |
2cde6acd | 827 | static void netpoll_async_cleanup(struct work_struct *work) |
38e6bc18 | 828 | { |
2cde6acd | 829 | struct netpoll *np = container_of(work, struct netpoll, cleanup_work); |
93ec2c72 | 830 | |
2cde6acd | 831 | rtnl_lock(); |
38e6bc18 | 832 | __netpoll_cleanup(np); |
2cde6acd | 833 | rtnl_unlock(); |
38e6bc18 AW |
834 | kfree(np); |
835 | } | |
93ec2c72 | 836 | |
2cde6acd | 837 | void __netpoll_free_async(struct netpoll *np) |
38e6bc18 | 838 | { |
2cde6acd | 839 | schedule_work(&np->cleanup_work); |
8fdd95ec | 840 | } |
2cde6acd | 841 | EXPORT_SYMBOL_GPL(__netpoll_free_async); |
fbeec2e1 | 842 | |
8fdd95ec HX |
843 | void netpoll_cleanup(struct netpoll *np) |
844 | { | |
8fdd95ec | 845 | rtnl_lock(); |
d0fe8c88 NA |
846 | if (!np->dev) |
847 | goto out; | |
8fdd95ec | 848 | __netpoll_cleanup(np); |
8fdd95ec | 849 | dev_put(np->dev); |
1da177e4 | 850 | np->dev = NULL; |
d0fe8c88 NA |
851 | out: |
852 | rtnl_unlock(); | |
1da177e4 | 853 | } |
9e34a5b5 | 854 | EXPORT_SYMBOL(netpoll_cleanup); |