Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
2 | /* |
3 | * Common framework for low-level network console, dump, and debugger code | |
4 | * | |
5 | * Sep 8 2003 Matt Mackall <mpm@selenic.com> | |
6 | * | |
7 | * based on the netconsole code from: | |
8 | * | |
9 | * Copyright (C) 2001 Ingo Molnar <mingo@redhat.com> | |
10 | * Copyright (C) 2002 Red Hat, Inc. | |
11 | */ | |
12 | ||
e6ec2693 JP |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | ||
bff38771 | 15 | #include <linux/moduleparam.h> |
4cd5773a | 16 | #include <linux/kernel.h> |
1da177e4 LT |
17 | #include <linux/netdevice.h> |
18 | #include <linux/etherdevice.h> | |
19 | #include <linux/string.h> | |
14c85021 | 20 | #include <linux/if_arp.h> |
1da177e4 LT |
21 | #include <linux/inetdevice.h> |
22 | #include <linux/inet.h> | |
23 | #include <linux/interrupt.h> | |
24 | #include <linux/netpoll.h> | |
25 | #include <linux/sched.h> | |
26 | #include <linux/delay.h> | |
27 | #include <linux/rcupdate.h> | |
28 | #include <linux/workqueue.h> | |
5a0e3ad6 | 29 | #include <linux/slab.h> |
bc3b2d7f | 30 | #include <linux/export.h> |
689971b4 | 31 | #include <linux/if_vlan.h> |
1da177e4 LT |
32 | #include <net/tcp.h> |
33 | #include <net/udp.h> | |
b3d936f3 CW |
34 | #include <net/addrconf.h> |
35 | #include <net/ndisc.h> | |
36 | #include <net/ip6_checksum.h> | |
1da177e4 | 37 | #include <asm/unaligned.h> |
9cbc1cb8 | 38 | #include <trace/events/napi.h> |
1da177e4 LT |
39 | |
40 | /* | |
41 | * We maintain a small pool of fully-sized skbs, to make sure the | |
42 | * message gets out even in extreme OOM situations. | |
43 | */ | |
44 | ||
45 | #define MAX_UDP_CHUNK 1460 | |
46 | #define MAX_SKBS 32 | |
1da177e4 | 47 | |
a1bcfacd | 48 | static struct sk_buff_head skb_pool; |
1da177e4 | 49 | |
7f9421c2 | 50 | DEFINE_STATIC_SRCU(netpoll_srcu); |
ca99ca14 | 51 | |
2bdfe0ba | 52 | #define USEC_PER_POLL 50 |
1da177e4 | 53 | |
6f706245 JP |
54 | #define MAX_SKB_SIZE \ |
55 | (sizeof(struct ethhdr) + \ | |
56 | sizeof(struct iphdr) + \ | |
57 | sizeof(struct udphdr) + \ | |
58 | MAX_UDP_CHUNK) | |
1da177e4 | 59 | |
3578b0c8 | 60 | static void zap_completion_queue(void); |
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; |
c70b17b7 | 108 | unsigned int q_index; |
1da177e4 | 109 | |
6c43ff18 | 110 | if (!netif_device_present(dev) || !netif_running(dev)) { |
080b3c19 | 111 | kfree_skb(skb); |
6c43ff18 SH |
112 | continue; |
113 | } | |
1da177e4 | 114 | |
3640543d | 115 | local_irq_save(flags); |
c70b17b7 TD |
116 | /* check if skb->queue_mapping is still valid */ |
117 | q_index = skb_get_queue_mapping(skb); | |
118 | if (unlikely(q_index >= dev->real_num_tx_queues)) { | |
119 | q_index = q_index % dev->real_num_tx_queues; | |
120 | skb_set_queue_mapping(skb, q_index); | |
121 | } | |
122 | txq = netdev_get_tx_queue(dev, q_index); | |
5efeac44 | 123 | HARD_TX_LOCK(dev, txq, smp_processor_id()); |
73466498 | 124 | if (netif_xmit_frozen_or_stopped(txq) || |
944e2948 | 125 | netpoll_start_xmit(skb, dev, txq) != NETDEV_TX_OK) { |
6c43ff18 | 126 | skb_queue_head(&npinfo->txq, skb); |
5efeac44 | 127 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 128 | local_irq_restore(flags); |
1da177e4 | 129 | |
25442caf | 130 | schedule_delayed_work(&npinfo->tx_work, HZ/10); |
6c43ff18 SH |
131 | return; |
132 | } | |
5efeac44 | 133 | HARD_TX_UNLOCK(dev, txq); |
3640543d | 134 | local_irq_restore(flags); |
1da177e4 | 135 | } |
1da177e4 LT |
136 | } |
137 | ||
822d54b9 | 138 | static void poll_one_napi(struct napi_struct *napi) |
0a7606c1 | 139 | { |
c24498c6 | 140 | int work; |
0a7606c1 | 141 | |
2d8bff12 NH |
142 | /* If we set this bit but see that it has already been set, |
143 | * that indicates that napi has been disabled and we need | |
144 | * to abort this operation | |
145 | */ | |
146 | if (test_and_set_bit(NAPI_STATE_NPSVC, &napi->state)) | |
822d54b9 | 147 | return; |
0a7606c1 | 148 | |
822d54b9 AD |
149 | /* We explicilty pass the polling call a budget of 0 to |
150 | * indicate that we are clearing the Tx path only. | |
151 | */ | |
152 | work = napi->poll(napi, 0); | |
d75f773c | 153 | WARN_ONCE(work, "%pS exceeded budget in poll\n", napi->poll); |
1db19db7 | 154 | trace_napi_poll(napi, work, 0); |
0a7606c1 | 155 | |
7b363e44 | 156 | clear_bit(NAPI_STATE_NPSVC, &napi->state); |
0a7606c1 DM |
157 | } |
158 | ||
822d54b9 | 159 | static void poll_napi(struct net_device *dev) |
1da177e4 | 160 | { |
bea3348e | 161 | struct napi_struct *napi; |
89c4b442 | 162 | int cpu = smp_processor_id(); |
1da177e4 | 163 | |
f13d493d | 164 | list_for_each_entry(napi, &dev->napi_list, dev_list) { |
89c4b442 | 165 | if (cmpxchg(&napi->poll_owner, -1, cpu) == -1) { |
822d54b9 | 166 | poll_one_napi(napi); |
89c4b442 | 167 | smp_store_release(&napi->poll_owner, -1); |
bea3348e | 168 | } |
1da177e4 LT |
169 | } |
170 | } | |
171 | ||
ac3d9dd0 | 172 | void netpoll_poll_dev(struct net_device *dev) |
1da177e4 | 173 | { |
2899656b | 174 | struct netpoll_info *ni = rcu_dereference_bh(dev->npinfo); |
ac3d9dd0 | 175 | const struct net_device_ops *ops; |
5106930b | 176 | |
ca99ca14 NH |
177 | /* Don't do any rx activity if the dev_lock mutex is held |
178 | * the dev_open/close paths use this to block netpoll activity | |
179 | * while changing device state | |
180 | */ | |
ac3d9dd0 | 181 | if (!ni || down_trylock(&ni->dev_lock)) |
ca99ca14 NH |
182 | return; |
183 | ||
959d5fde | 184 | if (!netif_running(dev)) { |
bd7c4b60 | 185 | up(&ni->dev_lock); |
5e392739 | 186 | return; |
959d5fde | 187 | } |
5e392739 PE |
188 | |
189 | ops = dev->netdev_ops; | |
ac3d9dd0 ED |
190 | if (ops->ndo_poll_controller) |
191 | ops->ndo_poll_controller(dev); | |
5106930b | 192 | |
822d54b9 | 193 | poll_napi(dev); |
1da177e4 | 194 | |
bd7c4b60 | 195 | up(&ni->dev_lock); |
ca99ca14 | 196 | |
3578b0c8 | 197 | zap_completion_queue(); |
1da177e4 | 198 | } |
ac3d9dd0 | 199 | EXPORT_SYMBOL(netpoll_poll_dev); |
1da177e4 | 200 | |
66b5552f | 201 | void netpoll_poll_disable(struct net_device *dev) |
ca99ca14 NH |
202 | { |
203 | struct netpoll_info *ni; | |
204 | int idx; | |
205 | might_sleep(); | |
206 | idx = srcu_read_lock(&netpoll_srcu); | |
207 | ni = srcu_dereference(dev->npinfo, &netpoll_srcu); | |
208 | if (ni) | |
bd7c4b60 | 209 | down(&ni->dev_lock); |
ca99ca14 | 210 | srcu_read_unlock(&netpoll_srcu, idx); |
ca99ca14 | 211 | } |
66b5552f | 212 | EXPORT_SYMBOL(netpoll_poll_disable); |
ca99ca14 | 213 | |
66b5552f | 214 | void netpoll_poll_enable(struct net_device *dev) |
ca99ca14 NH |
215 | { |
216 | struct netpoll_info *ni; | |
217 | rcu_read_lock(); | |
218 | ni = rcu_dereference(dev->npinfo); | |
219 | if (ni) | |
bd7c4b60 | 220 | up(&ni->dev_lock); |
ca99ca14 NH |
221 | rcu_read_unlock(); |
222 | } | |
66b5552f | 223 | EXPORT_SYMBOL(netpoll_poll_enable); |
ca99ca14 | 224 | |
1da177e4 LT |
225 | static void refill_skbs(void) |
226 | { | |
227 | struct sk_buff *skb; | |
228 | unsigned long flags; | |
229 | ||
a1bcfacd SH |
230 | spin_lock_irqsave(&skb_pool.lock, flags); |
231 | while (skb_pool.qlen < MAX_SKBS) { | |
1da177e4 LT |
232 | skb = alloc_skb(MAX_SKB_SIZE, GFP_ATOMIC); |
233 | if (!skb) | |
234 | break; | |
235 | ||
a1bcfacd | 236 | __skb_queue_tail(&skb_pool, skb); |
1da177e4 | 237 | } |
a1bcfacd | 238 | spin_unlock_irqrestore(&skb_pool.lock, flags); |
1da177e4 LT |
239 | } |
240 | ||
3578b0c8 DM |
241 | static void zap_completion_queue(void) |
242 | { | |
243 | unsigned long flags; | |
244 | struct softnet_data *sd = &get_cpu_var(softnet_data); | |
245 | ||
246 | if (sd->completion_queue) { | |
247 | struct sk_buff *clist; | |
248 | ||
249 | local_irq_save(flags); | |
250 | clist = sd->completion_queue; | |
251 | sd->completion_queue = NULL; | |
252 | local_irq_restore(flags); | |
253 | ||
254 | while (clist != NULL) { | |
255 | struct sk_buff *skb = clist; | |
256 | clist = clist->next; | |
b1586f09 | 257 | if (!skb_irq_freeable(skb)) { |
230cd127 | 258 | refcount_set(&skb->users, 1); |
3578b0c8 DM |
259 | dev_kfree_skb_any(skb); /* put this one back */ |
260 | } else { | |
261 | __kfree_skb(skb); | |
262 | } | |
263 | } | |
264 | } | |
265 | ||
266 | put_cpu_var(softnet_data); | |
267 | } | |
268 | ||
a1bcfacd | 269 | static struct sk_buff *find_skb(struct netpoll *np, int len, int reserve) |
1da177e4 | 270 | { |
a1bcfacd SH |
271 | int count = 0; |
272 | struct sk_buff *skb; | |
1da177e4 | 273 | |
3578b0c8 | 274 | zap_completion_queue(); |
a1bcfacd | 275 | refill_skbs(); |
1da177e4 | 276 | repeat: |
1da177e4 LT |
277 | |
278 | skb = alloc_skb(len, GFP_ATOMIC); | |
a1bcfacd SH |
279 | if (!skb) |
280 | skb = skb_dequeue(&skb_pool); | |
1da177e4 LT |
281 | |
282 | if (!skb) { | |
a1bcfacd | 283 | if (++count < 10) { |
2a49e001 | 284 | netpoll_poll_dev(np->dev); |
a1bcfacd | 285 | goto repeat; |
1da177e4 | 286 | } |
a1bcfacd | 287 | return NULL; |
1da177e4 LT |
288 | } |
289 | ||
63354797 | 290 | refcount_set(&skb->users, 1); |
1da177e4 LT |
291 | skb_reserve(skb, reserve); |
292 | return skb; | |
293 | } | |
294 | ||
bea3348e SH |
295 | static int netpoll_owner_active(struct net_device *dev) |
296 | { | |
297 | struct napi_struct *napi; | |
298 | ||
299 | list_for_each_entry(napi, &dev->napi_list, dev_list) { | |
300 | if (napi->poll_owner == smp_processor_id()) | |
301 | return 1; | |
302 | } | |
303 | return 0; | |
304 | } | |
305 | ||
2899656b | 306 | /* call with IRQ disabled */ |
c2355e1a NH |
307 | void netpoll_send_skb_on_dev(struct netpoll *np, struct sk_buff *skb, |
308 | struct net_device *dev) | |
1da177e4 | 309 | { |
2bdfe0ba SH |
310 | int status = NETDEV_TX_BUSY; |
311 | unsigned long tries; | |
de85d99e | 312 | /* It is up to the caller to keep npinfo alive. */ |
2899656b | 313 | struct netpoll_info *npinfo; |
2bdfe0ba | 314 | |
af073393 | 315 | lockdep_assert_irqs_disabled(); |
2899656b AW |
316 | |
317 | npinfo = rcu_dereference_bh(np->dev->npinfo); | |
4ec93edb | 318 | if (!npinfo || !netif_running(dev) || !netif_device_present(dev)) { |
080b3c19 | 319 | dev_kfree_skb_irq(skb); |
4ec93edb YH |
320 | return; |
321 | } | |
2bdfe0ba SH |
322 | |
323 | /* don't get messages out of order, and no recursion */ | |
bea3348e | 324 | if (skb_queue_len(&npinfo->txq) == 0 && !netpoll_owner_active(dev)) { |
fd2ea0a7 | 325 | struct netdev_queue *txq; |
a49f99ff | 326 | |
4bd97d51 | 327 | txq = netdev_core_pick_tx(dev, skb, NULL); |
fd2ea0a7 | 328 | |
0db3dc73 SH |
329 | /* try until next clock tick */ |
330 | for (tries = jiffies_to_usecs(1)/USEC_PER_POLL; | |
331 | tries > 0; --tries) { | |
5efeac44 | 332 | if (HARD_TX_TRYLOCK(dev, txq)) { |
944e2948 EB |
333 | if (!netif_xmit_stopped(txq)) |
334 | status = netpoll_start_xmit(skb, dev, txq); | |
335 | ||
5efeac44 | 336 | HARD_TX_UNLOCK(dev, txq); |
e37b8d93 AM |
337 | |
338 | if (status == NETDEV_TX_OK) | |
339 | break; | |
340 | ||
e37b8d93 | 341 | } |
0db3dc73 SH |
342 | |
343 | /* tickle device maybe there is some cleanup */ | |
2a49e001 | 344 | netpoll_poll_dev(np->dev); |
0db3dc73 SH |
345 | |
346 | udelay(USEC_PER_POLL); | |
0db1d6fc | 347 | } |
79b1bee8 DD |
348 | |
349 | WARN_ONCE(!irqs_disabled(), | |
d75f773c | 350 | "netpoll_send_skb_on_dev(): %s enabled interrupts in poll (%pS)\n", |
944e2948 | 351 | dev->name, dev->netdev_ops->ndo_start_xmit); |
79b1bee8 | 352 | |
1da177e4 | 353 | } |
1da177e4 | 354 | |
2bdfe0ba | 355 | if (status != NETDEV_TX_OK) { |
5de4a473 | 356 | skb_queue_tail(&npinfo->txq, skb); |
4c1ac1b4 | 357 | schedule_delayed_work(&npinfo->tx_work,0); |
1da177e4 | 358 | } |
1da177e4 | 359 | } |
c2355e1a | 360 | EXPORT_SYMBOL(netpoll_send_skb_on_dev); |
1da177e4 LT |
361 | |
362 | void netpoll_send_udp(struct netpoll *np, const char *msg, int len) | |
363 | { | |
954fba02 | 364 | int total_len, ip_len, udp_len; |
1da177e4 LT |
365 | struct sk_buff *skb; |
366 | struct udphdr *udph; | |
367 | struct iphdr *iph; | |
368 | struct ethhdr *eth; | |
ee130409 | 369 | static atomic_t ip_ident; |
b3d936f3 | 370 | struct ipv6hdr *ip6h; |
1da177e4 | 371 | |
c9fd56b3 NA |
372 | WARN_ON_ONCE(!irqs_disabled()); |
373 | ||
1da177e4 | 374 | udp_len = len + sizeof(*udph); |
b3d936f3 CW |
375 | if (np->ipv6) |
376 | ip_len = udp_len + sizeof(*ip6h); | |
377 | else | |
b7394d24 CW |
378 | ip_len = udp_len + sizeof(*iph); |
379 | ||
954fba02 | 380 | total_len = ip_len + LL_RESERVED_SPACE(np->dev); |
1da177e4 | 381 | |
954fba02 ED |
382 | skb = find_skb(np, total_len + np->dev->needed_tailroom, |
383 | total_len - len); | |
1da177e4 LT |
384 | if (!skb) |
385 | return; | |
386 | ||
27d7ff46 | 387 | skb_copy_to_linear_data(skb, msg, len); |
954fba02 | 388 | skb_put(skb, len); |
1da177e4 | 389 | |
4bedb452 ACM |
390 | skb_push(skb, sizeof(*udph)); |
391 | skb_reset_transport_header(skb); | |
392 | udph = udp_hdr(skb); | |
1da177e4 LT |
393 | udph->source = htons(np->local_port); |
394 | udph->dest = htons(np->remote_port); | |
395 | udph->len = htons(udp_len); | |
b7394d24 | 396 | |
b3d936f3 CW |
397 | if (np->ipv6) { |
398 | udph->check = 0; | |
399 | udph->check = csum_ipv6_magic(&np->local_ip.in6, | |
400 | &np->remote_ip.in6, | |
401 | udp_len, IPPROTO_UDP, | |
402 | csum_partial(udph, udp_len, 0)); | |
403 | if (udph->check == 0) | |
404 | udph->check = CSUM_MANGLED_0; | |
405 | ||
406 | skb_push(skb, sizeof(*ip6h)); | |
407 | skb_reset_network_header(skb); | |
408 | ip6h = ipv6_hdr(skb); | |
409 | ||
410 | /* ip6h->version = 6; ip6h->priority = 0; */ | |
411 | put_unaligned(0x60, (unsigned char *)ip6h); | |
412 | ip6h->flow_lbl[0] = 0; | |
413 | ip6h->flow_lbl[1] = 0; | |
414 | ip6h->flow_lbl[2] = 0; | |
415 | ||
416 | ip6h->payload_len = htons(sizeof(struct udphdr) + len); | |
417 | ip6h->nexthdr = IPPROTO_UDP; | |
418 | ip6h->hop_limit = 32; | |
419 | ip6h->saddr = np->local_ip.in6; | |
420 | ip6h->daddr = np->remote_ip.in6; | |
421 | ||
d58ff351 | 422 | eth = skb_push(skb, ETH_HLEN); |
b3d936f3 CW |
423 | skb_reset_mac_header(skb); |
424 | skb->protocol = eth->h_proto = htons(ETH_P_IPV6); | |
425 | } else { | |
b7394d24 CW |
426 | udph->check = 0; |
427 | udph->check = csum_tcpudp_magic(np->local_ip.ip, | |
428 | np->remote_ip.ip, | |
429 | udp_len, IPPROTO_UDP, | |
430 | csum_partial(udph, udp_len, 0)); | |
431 | if (udph->check == 0) | |
432 | udph->check = CSUM_MANGLED_0; | |
433 | ||
434 | skb_push(skb, sizeof(*iph)); | |
435 | skb_reset_network_header(skb); | |
436 | iph = ip_hdr(skb); | |
437 | ||
438 | /* iph->version = 4; iph->ihl = 5; */ | |
439 | put_unaligned(0x45, (unsigned char *)iph); | |
440 | iph->tos = 0; | |
441 | put_unaligned(htons(ip_len), &(iph->tot_len)); | |
442 | iph->id = htons(atomic_inc_return(&ip_ident)); | |
443 | iph->frag_off = 0; | |
444 | iph->ttl = 64; | |
445 | iph->protocol = IPPROTO_UDP; | |
446 | iph->check = 0; | |
447 | put_unaligned(np->local_ip.ip, &(iph->saddr)); | |
448 | put_unaligned(np->remote_ip.ip, &(iph->daddr)); | |
449 | iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl); | |
450 | ||
d58ff351 | 451 | eth = skb_push(skb, ETH_HLEN); |
b7394d24 CW |
452 | skb_reset_mac_header(skb); |
453 | skb->protocol = eth->h_proto = htons(ETH_P_IP); | |
454 | } | |
455 | ||
c62326ab JP |
456 | ether_addr_copy(eth->h_source, np->dev->dev_addr); |
457 | ether_addr_copy(eth->h_dest, np->remote_mac); | |
1da177e4 LT |
458 | |
459 | skb->dev = np->dev; | |
460 | ||
461 | netpoll_send_skb(np, skb); | |
462 | } | |
9e34a5b5 | 463 | EXPORT_SYMBOL(netpoll_send_udp); |
1da177e4 | 464 | |
0bcc1816 SS |
465 | void netpoll_print_options(struct netpoll *np) |
466 | { | |
e6ec2693 | 467 | np_info(np, "local port %d\n", np->local_port); |
b3d936f3 CW |
468 | if (np->ipv6) |
469 | np_info(np, "local IPv6 address %pI6c\n", &np->local_ip.in6); | |
470 | else | |
b7394d24 | 471 | np_info(np, "local IPv4 address %pI4\n", &np->local_ip.ip); |
e6ec2693 JP |
472 | np_info(np, "interface '%s'\n", np->dev_name); |
473 | np_info(np, "remote port %d\n", np->remote_port); | |
b3d936f3 CW |
474 | if (np->ipv6) |
475 | np_info(np, "remote IPv6 address %pI6c\n", &np->remote_ip.in6); | |
476 | else | |
b7394d24 | 477 | np_info(np, "remote IPv4 address %pI4\n", &np->remote_ip.ip); |
e6ec2693 | 478 | np_info(np, "remote ethernet address %pM\n", np->remote_mac); |
0bcc1816 | 479 | } |
9e34a5b5 | 480 | EXPORT_SYMBOL(netpoll_print_options); |
0bcc1816 | 481 | |
b7394d24 CW |
482 | static int netpoll_parse_ip_addr(const char *str, union inet_addr *addr) |
483 | { | |
484 | const char *end; | |
485 | ||
486 | if (!strchr(str, ':') && | |
487 | in4_pton(str, -1, (void *)addr, -1, &end) > 0) { | |
488 | if (!*end) | |
489 | return 0; | |
490 | } | |
491 | if (in6_pton(str, -1, addr->in6.s6_addr, -1, &end) > 0) { | |
492 | #if IS_ENABLED(CONFIG_IPV6) | |
493 | if (!*end) | |
494 | return 1; | |
495 | #else | |
496 | return -1; | |
497 | #endif | |
498 | } | |
499 | return -1; | |
500 | } | |
501 | ||
1da177e4 LT |
502 | int netpoll_parse_options(struct netpoll *np, char *opt) |
503 | { | |
504 | char *cur=opt, *delim; | |
b7394d24 | 505 | int ipv6; |
00fe11b3 | 506 | bool ipversion_set = false; |
1da177e4 | 507 | |
c68b9070 | 508 | if (*cur != '@') { |
1da177e4 LT |
509 | if ((delim = strchr(cur, '@')) == NULL) |
510 | goto parse_failed; | |
c68b9070 | 511 | *delim = 0; |
4b5511eb AP |
512 | if (kstrtou16(cur, 10, &np->local_port)) |
513 | goto parse_failed; | |
c68b9070 | 514 | cur = delim; |
1da177e4 LT |
515 | } |
516 | cur++; | |
1da177e4 | 517 | |
c68b9070 | 518 | if (*cur != '/') { |
00fe11b3 | 519 | ipversion_set = true; |
1da177e4 LT |
520 | if ((delim = strchr(cur, '/')) == NULL) |
521 | goto parse_failed; | |
c68b9070 | 522 | *delim = 0; |
b7394d24 CW |
523 | ipv6 = netpoll_parse_ip_addr(cur, &np->local_ip); |
524 | if (ipv6 < 0) | |
525 | goto parse_failed; | |
526 | else | |
527 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 528 | cur = delim; |
1da177e4 LT |
529 | } |
530 | cur++; | |
531 | ||
c68b9070 | 532 | if (*cur != ',') { |
1da177e4 LT |
533 | /* parse out dev name */ |
534 | if ((delim = strchr(cur, ',')) == NULL) | |
535 | goto parse_failed; | |
c68b9070 | 536 | *delim = 0; |
1da177e4 | 537 | strlcpy(np->dev_name, cur, sizeof(np->dev_name)); |
c68b9070 | 538 | cur = delim; |
1da177e4 LT |
539 | } |
540 | cur++; | |
541 | ||
c68b9070 | 542 | if (*cur != '@') { |
1da177e4 LT |
543 | /* dst port */ |
544 | if ((delim = strchr(cur, '@')) == NULL) | |
545 | goto parse_failed; | |
c68b9070 | 546 | *delim = 0; |
5fc05f87 | 547 | if (*cur == ' ' || *cur == '\t') |
e6ec2693 | 548 | np_info(np, "warning: whitespace is not allowed\n"); |
4b5511eb AP |
549 | if (kstrtou16(cur, 10, &np->remote_port)) |
550 | goto parse_failed; | |
c68b9070 | 551 | cur = delim; |
1da177e4 LT |
552 | } |
553 | cur++; | |
1da177e4 LT |
554 | |
555 | /* dst ip */ | |
556 | if ((delim = strchr(cur, '/')) == NULL) | |
557 | goto parse_failed; | |
c68b9070 | 558 | *delim = 0; |
b7394d24 CW |
559 | ipv6 = netpoll_parse_ip_addr(cur, &np->remote_ip); |
560 | if (ipv6 < 0) | |
561 | goto parse_failed; | |
00fe11b3 | 562 | else if (ipversion_set && np->ipv6 != (bool)ipv6) |
b7394d24 CW |
563 | goto parse_failed; |
564 | else | |
565 | np->ipv6 = (bool)ipv6; | |
c68b9070 | 566 | cur = delim + 1; |
1da177e4 | 567 | |
c68b9070 | 568 | if (*cur != 0) { |
1da177e4 | 569 | /* MAC address */ |
4940fc88 | 570 | if (!mac_pton(cur, np->remote_mac)) |
1da177e4 | 571 | goto parse_failed; |
1da177e4 LT |
572 | } |
573 | ||
0bcc1816 | 574 | netpoll_print_options(np); |
1da177e4 LT |
575 | |
576 | return 0; | |
577 | ||
578 | parse_failed: | |
e6ec2693 | 579 | np_info(np, "couldn't parse config at '%s'!\n", cur); |
1da177e4 LT |
580 | return -1; |
581 | } | |
9e34a5b5 | 582 | EXPORT_SYMBOL(netpoll_parse_options); |
1da177e4 | 583 | |
a8779ec1 | 584 | int __netpoll_setup(struct netpoll *np, struct net_device *ndev) |
1da177e4 | 585 | { |
115c1d6e | 586 | struct netpoll_info *npinfo; |
4247e161 | 587 | const struct net_device_ops *ops; |
b41848b6 | 588 | int err; |
1da177e4 | 589 | |
727ceaa4 | 590 | np->dev = ndev; |
30fdd8a0 JP |
591 | strlcpy(np->dev_name, ndev->name, IFNAMSIZ); |
592 | ||
ac3d9dd0 | 593 | if (ndev->priv_flags & IFF_DISABLE_NETPOLL) { |
e6ec2693 JP |
594 | np_err(np, "%s doesn't support polling, aborting\n", |
595 | np->dev_name); | |
8fdd95ec HX |
596 | err = -ENOTSUPP; |
597 | goto out; | |
598 | } | |
599 | ||
600 | if (!ndev->npinfo) { | |
a8779ec1 | 601 | npinfo = kmalloc(sizeof(*npinfo), GFP_KERNEL); |
8fdd95ec HX |
602 | if (!npinfo) { |
603 | err = -ENOMEM; | |
604 | goto out; | |
605 | } | |
606 | ||
bd7c4b60 | 607 | sema_init(&npinfo->dev_lock, 1); |
8fdd95ec HX |
608 | skb_queue_head_init(&npinfo->txq); |
609 | INIT_DELAYED_WORK(&npinfo->tx_work, queue_process); | |
610 | ||
433cea4d | 611 | refcount_set(&npinfo->refcnt, 1); |
8fdd95ec HX |
612 | |
613 | ops = np->dev->netdev_ops; | |
614 | if (ops->ndo_netpoll_setup) { | |
a8779ec1 | 615 | err = ops->ndo_netpoll_setup(ndev, npinfo); |
8fdd95ec HX |
616 | if (err) |
617 | goto free_npinfo; | |
618 | } | |
619 | } else { | |
0790bbb6 | 620 | npinfo = rtnl_dereference(ndev->npinfo); |
433cea4d | 621 | refcount_inc(&npinfo->refcnt); |
8fdd95ec HX |
622 | } |
623 | ||
624 | npinfo->netpoll = np; | |
625 | ||
8fdd95ec | 626 | /* last thing to do is link it to the net device structure */ |
cf778b00 | 627 | rcu_assign_pointer(ndev->npinfo, npinfo); |
8fdd95ec HX |
628 | |
629 | return 0; | |
630 | ||
631 | free_npinfo: | |
632 | kfree(npinfo); | |
633 | out: | |
634 | return err; | |
635 | } | |
636 | EXPORT_SYMBOL_GPL(__netpoll_setup); | |
637 | ||
638 | int netpoll_setup(struct netpoll *np) | |
639 | { | |
640 | struct net_device *ndev = NULL; | |
641 | struct in_device *in_dev; | |
642 | int err; | |
643 | ||
f92d3180 | 644 | rtnl_lock(); |
0c3a8f8b | 645 | if (np->dev_name[0]) { |
556e6256 CW |
646 | struct net *net = current->nsproxy->net_ns; |
647 | ndev = __dev_get_by_name(net, np->dev_name); | |
648 | } | |
1da177e4 | 649 | if (!ndev) { |
e6ec2693 | 650 | np_err(np, "%s doesn't exist, aborting\n", np->dev_name); |
f92d3180 CW |
651 | err = -ENODEV; |
652 | goto unlock; | |
1da177e4 | 653 | } |
5bd30d39 | 654 | dev_hold(ndev); |
1da177e4 | 655 | |
49bd8fb0 | 656 | if (netdev_master_upper_dev_get(ndev)) { |
e6ec2693 | 657 | np_err(np, "%s is a slave device, aborting\n", np->dev_name); |
83fe32de DC |
658 | err = -EBUSY; |
659 | goto put; | |
0c1ad04a WC |
660 | } |
661 | ||
1da177e4 LT |
662 | if (!netif_running(ndev)) { |
663 | unsigned long atmost, atleast; | |
664 | ||
e6ec2693 | 665 | np_info(np, "device %s not up yet, forcing it\n", np->dev_name); |
1da177e4 | 666 | |
00f54e68 | 667 | err = dev_open(ndev, NULL); |
b41848b6 SH |
668 | |
669 | if (err) { | |
e6ec2693 | 670 | np_err(np, "failed to open %s\n", ndev->name); |
dbaa1541 | 671 | goto put; |
1da177e4 | 672 | } |
1da177e4 | 673 | |
f92d3180 | 674 | rtnl_unlock(); |
1da177e4 | 675 | atleast = jiffies + HZ/10; |
bff38771 | 676 | atmost = jiffies + carrier_timeout * HZ; |
1da177e4 LT |
677 | while (!netif_carrier_ok(ndev)) { |
678 | if (time_after(jiffies, atmost)) { | |
e6ec2693 | 679 | np_notice(np, "timeout waiting for carrier\n"); |
1da177e4 LT |
680 | break; |
681 | } | |
1b614fb9 | 682 | msleep(1); |
1da177e4 LT |
683 | } |
684 | ||
685 | /* If carrier appears to come up instantly, we don't | |
686 | * trust it and pause so that we don't pump all our | |
687 | * queued console messages into the bitbucket. | |
688 | */ | |
689 | ||
690 | if (time_before(jiffies, atleast)) { | |
e6ec2693 | 691 | np_notice(np, "carrier detect appears untrustworthy, waiting 4 seconds\n"); |
1da177e4 LT |
692 | msleep(4000); |
693 | } | |
f92d3180 | 694 | rtnl_lock(); |
1da177e4 LT |
695 | } |
696 | ||
b7394d24 CW |
697 | if (!np->local_ip.ip) { |
698 | if (!np->ipv6) { | |
2638eb8b FW |
699 | const struct in_ifaddr *ifa; |
700 | ||
f92d3180 | 701 | in_dev = __in_dev_get_rtnl(ndev); |
2638eb8b FW |
702 | if (!in_dev) |
703 | goto put_noaddr; | |
b7394d24 | 704 | |
2638eb8b FW |
705 | ifa = rtnl_dereference(in_dev->ifa_list); |
706 | if (!ifa) { | |
707 | put_noaddr: | |
b7394d24 CW |
708 | np_err(np, "no IP address for %s, aborting\n", |
709 | np->dev_name); | |
710 | err = -EDESTADDRREQ; | |
711 | goto put; | |
712 | } | |
713 | ||
2638eb8b | 714 | np->local_ip.ip = ifa->ifa_local; |
b7394d24 | 715 | np_info(np, "local IP %pI4\n", &np->local_ip.ip); |
b3d936f3 CW |
716 | } else { |
717 | #if IS_ENABLED(CONFIG_IPV6) | |
718 | struct inet6_dev *idev; | |
719 | ||
720 | err = -EDESTADDRREQ; | |
b3d936f3 CW |
721 | idev = __in6_dev_get(ndev); |
722 | if (idev) { | |
723 | struct inet6_ifaddr *ifp; | |
724 | ||
725 | read_lock_bh(&idev->lock); | |
726 | list_for_each_entry(ifp, &idev->addr_list, if_list) { | |
d016b4a3 MK |
727 | if (!!(ipv6_addr_type(&ifp->addr) & IPV6_ADDR_LINKLOCAL) != |
728 | !!(ipv6_addr_type(&np->remote_ip.in6) & IPV6_ADDR_LINKLOCAL)) | |
b3d936f3 CW |
729 | continue; |
730 | np->local_ip.in6 = ifp->addr; | |
731 | err = 0; | |
732 | break; | |
733 | } | |
734 | read_unlock_bh(&idev->lock); | |
735 | } | |
b3d936f3 CW |
736 | if (err) { |
737 | np_err(np, "no IPv6 address for %s, aborting\n", | |
738 | np->dev_name); | |
739 | goto put; | |
740 | } else | |
741 | np_info(np, "local IPv6 %pI6c\n", &np->local_ip.in6); | |
742 | #else | |
743 | np_err(np, "IPv6 is not supported %s, aborting\n", | |
744 | np->dev_name); | |
e39363a9 | 745 | err = -EINVAL; |
b3d936f3 CW |
746 | goto put; |
747 | #endif | |
1da177e4 | 748 | } |
1da177e4 LT |
749 | } |
750 | ||
dbaa1541 HX |
751 | /* fill up the skb queue */ |
752 | refill_skbs(); | |
753 | ||
a8779ec1 | 754 | err = __netpoll_setup(np, ndev); |
8fdd95ec HX |
755 | if (err) |
756 | goto put; | |
757 | ||
f92d3180 | 758 | rtnl_unlock(); |
1da177e4 LT |
759 | return 0; |
760 | ||
21edbb22 | 761 | put: |
1da177e4 | 762 | dev_put(ndev); |
f92d3180 CW |
763 | unlock: |
764 | rtnl_unlock(); | |
b41848b6 | 765 | return err; |
1da177e4 | 766 | } |
9e34a5b5 | 767 | EXPORT_SYMBOL(netpoll_setup); |
1da177e4 | 768 | |
c68b9070 DM |
769 | static int __init netpoll_init(void) |
770 | { | |
a1bcfacd SH |
771 | skb_queue_head_init(&skb_pool); |
772 | return 0; | |
773 | } | |
774 | core_initcall(netpoll_init); | |
775 | ||
38e6bc18 AW |
776 | static void rcu_cleanup_netpoll_info(struct rcu_head *rcu_head) |
777 | { | |
778 | struct netpoll_info *npinfo = | |
779 | container_of(rcu_head, struct netpoll_info, rcu); | |
780 | ||
38e6bc18 AW |
781 | skb_queue_purge(&npinfo->txq); |
782 | ||
783 | /* we can't call cancel_delayed_work_sync here, as we are in softirq */ | |
784 | cancel_delayed_work(&npinfo->tx_work); | |
785 | ||
786 | /* clean after last, unfinished work */ | |
787 | __skb_queue_purge(&npinfo->txq); | |
788 | /* now cancel it again */ | |
789 | cancel_delayed_work(&npinfo->tx_work); | |
790 | kfree(npinfo); | |
791 | } | |
792 | ||
8fdd95ec | 793 | void __netpoll_cleanup(struct netpoll *np) |
1da177e4 | 794 | { |
fbeec2e1 | 795 | struct netpoll_info *npinfo; |
fbeec2e1 | 796 | |
0790bbb6 | 797 | npinfo = rtnl_dereference(np->dev->npinfo); |
8fdd95ec | 798 | if (!npinfo) |
dbaa1541 | 799 | return; |
93ec2c72 | 800 | |
ca99ca14 NH |
801 | synchronize_srcu(&netpoll_srcu); |
802 | ||
433cea4d | 803 | if (refcount_dec_and_test(&npinfo->refcnt)) { |
8fdd95ec | 804 | const struct net_device_ops *ops; |
de85d99e | 805 | |
8fdd95ec HX |
806 | ops = np->dev->netdev_ops; |
807 | if (ops->ndo_netpoll_cleanup) | |
808 | ops->ndo_netpoll_cleanup(np->dev); | |
de85d99e | 809 | |
fcb144b5 | 810 | RCU_INIT_POINTER(np->dev->npinfo, NULL); |
5da54c18 | 811 | call_rcu(&npinfo->rcu, rcu_cleanup_netpoll_info); |
efa95b01 | 812 | } else |
813 | RCU_INIT_POINTER(np->dev->npinfo, NULL); | |
38e6bc18 AW |
814 | } |
815 | EXPORT_SYMBOL_GPL(__netpoll_cleanup); | |
de85d99e | 816 | |
c9fbd71f | 817 | void __netpoll_free(struct netpoll *np) |
38e6bc18 | 818 | { |
c9fbd71f | 819 | ASSERT_RTNL(); |
93ec2c72 | 820 | |
c9fbd71f | 821 | /* Wait for transmitting packets to finish before freeing. */ |
5da54c18 | 822 | synchronize_rcu(); |
38e6bc18 AW |
823 | __netpoll_cleanup(np); |
824 | kfree(np); | |
825 | } | |
c9fbd71f | 826 | EXPORT_SYMBOL_GPL(__netpoll_free); |
fbeec2e1 | 827 | |
8fdd95ec HX |
828 | void netpoll_cleanup(struct netpoll *np) |
829 | { | |
8fdd95ec | 830 | rtnl_lock(); |
d0fe8c88 NA |
831 | if (!np->dev) |
832 | goto out; | |
8fdd95ec | 833 | __netpoll_cleanup(np); |
8fdd95ec | 834 | dev_put(np->dev); |
1da177e4 | 835 | np->dev = NULL; |
d0fe8c88 NA |
836 | out: |
837 | rtnl_unlock(); | |
1da177e4 | 838 | } |
9e34a5b5 | 839 | EXPORT_SYMBOL(netpoll_cleanup); |