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Commit | Line | Data |
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17926a79 DH |
1 | /* RxRPC packet transmission |
2 | * | |
3 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
4 | * Written by David Howells (dhowells@redhat.com) | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
9b6d5398 JP |
12 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
13 | ||
17926a79 | 14 | #include <linux/net.h> |
5a0e3ad6 | 15 | #include <linux/gfp.h> |
17926a79 | 16 | #include <linux/skbuff.h> |
bc3b2d7f | 17 | #include <linux/export.h> |
17926a79 DH |
18 | #include <net/sock.h> |
19 | #include <net/af_rxrpc.h> | |
20 | #include "ar-internal.h" | |
21 | ||
8d94aa38 DH |
22 | struct rxrpc_pkt_buffer { |
23 | struct rxrpc_wire_header whdr; | |
24 | union { | |
25 | struct { | |
26 | struct rxrpc_ackpacket ack; | |
27 | u8 acks[255]; | |
28 | u8 pad[3]; | |
29 | }; | |
30 | __be32 abort_code; | |
31 | }; | |
32 | struct rxrpc_ackinfo ackinfo; | |
33 | }; | |
34 | ||
35 | /* | |
36 | * Fill out an ACK packet. | |
37 | */ | |
38 | static size_t rxrpc_fill_out_ack(struct rxrpc_call *call, | |
805b21b9 DH |
39 | struct rxrpc_pkt_buffer *pkt, |
40 | rxrpc_seq_t *_hard_ack, | |
41 | rxrpc_seq_t *_top) | |
8d94aa38 | 42 | { |
f3639df2 | 43 | rxrpc_serial_t serial; |
248f219c DH |
44 | rxrpc_seq_t hard_ack, top, seq; |
45 | int ix; | |
8d94aa38 DH |
46 | u32 mtu, jmax; |
47 | u8 *ackp = pkt->acks; | |
48 | ||
248f219c | 49 | /* Barrier against rxrpc_input_data(). */ |
f3639df2 | 50 | serial = call->ackr_serial; |
248f219c DH |
51 | hard_ack = READ_ONCE(call->rx_hard_ack); |
52 | top = smp_load_acquire(&call->rx_top); | |
805b21b9 DH |
53 | *_hard_ack = hard_ack; |
54 | *_top = top; | |
248f219c | 55 | |
8d94aa38 | 56 | pkt->ack.bufferSpace = htons(8); |
248f219c DH |
57 | pkt->ack.maxSkew = htons(call->ackr_skew); |
58 | pkt->ack.firstPacket = htonl(hard_ack + 1); | |
8d94aa38 | 59 | pkt->ack.previousPacket = htonl(call->ackr_prev_seq); |
f3639df2 | 60 | pkt->ack.serial = htonl(serial); |
248f219c DH |
61 | pkt->ack.reason = call->ackr_reason; |
62 | pkt->ack.nAcks = top - hard_ack; | |
63 | ||
8e83134d DH |
64 | if (pkt->ack.reason == RXRPC_ACK_PING) |
65 | pkt->whdr.flags |= RXRPC_REQUEST_ACK; | |
66 | ||
248f219c DH |
67 | if (after(top, hard_ack)) { |
68 | seq = hard_ack + 1; | |
69 | do { | |
70 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
71 | if (call->rxtx_buffer[ix]) | |
72 | *ackp++ = RXRPC_ACK_TYPE_ACK; | |
73 | else | |
74 | *ackp++ = RXRPC_ACK_TYPE_NACK; | |
75 | seq++; | |
76 | } while (before_eq(seq, top)); | |
77 | } | |
8d94aa38 | 78 | |
248f219c DH |
79 | mtu = call->conn->params.peer->if_mtu; |
80 | mtu -= call->conn->params.peer->hdrsize; | |
75e42126 | 81 | jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max; |
8d94aa38 DH |
82 | pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
83 | pkt->ackinfo.maxMTU = htonl(mtu); | |
75e42126 | 84 | pkt->ackinfo.rwind = htonl(call->rx_winsize); |
8d94aa38 DH |
85 | pkt->ackinfo.jumbo_max = htonl(jmax); |
86 | ||
87 | *ackp++ = 0; | |
88 | *ackp++ = 0; | |
89 | *ackp++ = 0; | |
248f219c | 90 | return top - hard_ack + 3; |
8d94aa38 DH |
91 | } |
92 | ||
93 | /* | |
248f219c | 94 | * Send an ACK or ABORT call packet. |
8d94aa38 DH |
95 | */ |
96 | int rxrpc_send_call_packet(struct rxrpc_call *call, u8 type) | |
97 | { | |
98 | struct rxrpc_connection *conn = NULL; | |
99 | struct rxrpc_pkt_buffer *pkt; | |
100 | struct msghdr msg; | |
101 | struct kvec iov[2]; | |
102 | rxrpc_serial_t serial; | |
805b21b9 | 103 | rxrpc_seq_t hard_ack, top; |
8d94aa38 | 104 | size_t len, n; |
8e83134d | 105 | bool ping = false; |
8d94aa38 DH |
106 | int ioc, ret; |
107 | u32 abort_code; | |
108 | ||
109 | _enter("%u,%s", call->debug_id, rxrpc_pkts[type]); | |
110 | ||
111 | spin_lock_bh(&call->lock); | |
112 | if (call->conn) | |
113 | conn = rxrpc_get_connection_maybe(call->conn); | |
114 | spin_unlock_bh(&call->lock); | |
115 | if (!conn) | |
116 | return -ECONNRESET; | |
117 | ||
118 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
119 | if (!pkt) { | |
120 | rxrpc_put_connection(conn); | |
121 | return -ENOMEM; | |
122 | } | |
123 | ||
8d94aa38 DH |
124 | msg.msg_name = &call->peer->srx.transport; |
125 | msg.msg_namelen = call->peer->srx.transport_len; | |
126 | msg.msg_control = NULL; | |
127 | msg.msg_controllen = 0; | |
128 | msg.msg_flags = 0; | |
129 | ||
130 | pkt->whdr.epoch = htonl(conn->proto.epoch); | |
131 | pkt->whdr.cid = htonl(call->cid); | |
132 | pkt->whdr.callNumber = htonl(call->call_id); | |
133 | pkt->whdr.seq = 0; | |
8d94aa38 DH |
134 | pkt->whdr.type = type; |
135 | pkt->whdr.flags = conn->out_clientflag; | |
136 | pkt->whdr.userStatus = 0; | |
137 | pkt->whdr.securityIndex = call->security_ix; | |
138 | pkt->whdr._rsvd = 0; | |
139 | pkt->whdr.serviceId = htons(call->service_id); | |
140 | ||
141 | iov[0].iov_base = pkt; | |
142 | iov[0].iov_len = sizeof(pkt->whdr); | |
143 | len = sizeof(pkt->whdr); | |
144 | ||
145 | switch (type) { | |
146 | case RXRPC_PACKET_TYPE_ACK: | |
147 | spin_lock_bh(&call->lock); | |
27d0fc43 DH |
148 | if (!call->ackr_reason) { |
149 | spin_unlock_bh(&call->lock); | |
150 | ret = 0; | |
151 | goto out; | |
152 | } | |
8e83134d | 153 | ping = (call->ackr_reason == RXRPC_ACK_PING); |
805b21b9 | 154 | n = rxrpc_fill_out_ack(call, pkt, &hard_ack, &top); |
8d94aa38 DH |
155 | call->ackr_reason = 0; |
156 | ||
157 | spin_unlock_bh(&call->lock); | |
158 | ||
8d94aa38 DH |
159 | |
160 | iov[0].iov_len += sizeof(pkt->ack) + n; | |
161 | iov[1].iov_base = &pkt->ackinfo; | |
162 | iov[1].iov_len = sizeof(pkt->ackinfo); | |
163 | len += sizeof(pkt->ack) + n + sizeof(pkt->ackinfo); | |
164 | ioc = 2; | |
165 | break; | |
166 | ||
167 | case RXRPC_PACKET_TYPE_ABORT: | |
168 | abort_code = call->abort_code; | |
169 | pkt->abort_code = htonl(abort_code); | |
8d94aa38 DH |
170 | iov[0].iov_len += sizeof(pkt->abort_code); |
171 | len += sizeof(pkt->abort_code); | |
172 | ioc = 1; | |
173 | break; | |
174 | ||
175 | default: | |
176 | BUG(); | |
177 | ret = -ENOANO; | |
178 | goto out; | |
179 | } | |
180 | ||
b86e218e DH |
181 | serial = atomic_inc_return(&conn->serial); |
182 | pkt->whdr.serial = htonl(serial); | |
183 | switch (type) { | |
184 | case RXRPC_PACKET_TYPE_ACK: | |
be832aec | 185 | trace_rxrpc_tx_ack(call, serial, |
b86e218e DH |
186 | ntohl(pkt->ack.firstPacket), |
187 | ntohl(pkt->ack.serial), | |
188 | pkt->ack.reason, pkt->ack.nAcks); | |
189 | break; | |
190 | } | |
191 | ||
8e83134d DH |
192 | if (ping) { |
193 | call->ackr_ping = serial; | |
194 | smp_wmb(); | |
195 | /* We need to stick a time in before we send the packet in case | |
196 | * the reply gets back before kernel_sendmsg() completes - but | |
197 | * asking UDP to send the packet can take a relatively long | |
198 | * time, so we update the time after, on the assumption that | |
199 | * the packet transmission is more likely to happen towards the | |
200 | * end of the kernel_sendmsg() call. | |
201 | */ | |
202 | call->ackr_ping_time = ktime_get_real(); | |
203 | set_bit(RXRPC_CALL_PINGING, &call->flags); | |
204 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial); | |
205 | } | |
8d94aa38 DH |
206 | ret = kernel_sendmsg(conn->params.local->socket, |
207 | &msg, iov, ioc, len); | |
8e83134d DH |
208 | if (ping) |
209 | call->ackr_ping_time = ktime_get_real(); | |
8d94aa38 | 210 | |
805b21b9 DH |
211 | if (type == RXRPC_PACKET_TYPE_ACK && |
212 | call->state < RXRPC_CALL_COMPLETE) { | |
213 | if (ret < 0) { | |
8e83134d | 214 | clear_bit(RXRPC_CALL_PINGING, &call->flags); |
248f219c DH |
215 | rxrpc_propose_ACK(call, pkt->ack.reason, |
216 | ntohs(pkt->ack.maxSkew), | |
217 | ntohl(pkt->ack.serial), | |
9c7ad434 DH |
218 | true, true, |
219 | rxrpc_propose_ack_retry_tx); | |
805b21b9 DH |
220 | } else { |
221 | spin_lock_bh(&call->lock); | |
222 | if (after(hard_ack, call->ackr_consumed)) | |
223 | call->ackr_consumed = hard_ack; | |
224 | if (after(top, call->ackr_seen)) | |
225 | call->ackr_seen = top; | |
226 | spin_unlock_bh(&call->lock); | |
248f219c DH |
227 | } |
228 | } | |
229 | ||
8d94aa38 DH |
230 | out: |
231 | rxrpc_put_connection(conn); | |
232 | kfree(pkt); | |
233 | return ret; | |
234 | } | |
235 | ||
17926a79 DH |
236 | /* |
237 | * send a packet through the transport endpoint | |
238 | */ | |
5a924b89 | 239 | int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb) |
17926a79 | 240 | { |
5a924b89 DH |
241 | struct rxrpc_connection *conn = call->conn; |
242 | struct rxrpc_wire_header whdr; | |
243 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
17926a79 | 244 | struct msghdr msg; |
5a924b89 DH |
245 | struct kvec iov[2]; |
246 | rxrpc_serial_t serial; | |
247 | size_t len; | |
17926a79 DH |
248 | int ret, opt; |
249 | ||
250 | _enter(",{%d}", skb->len); | |
251 | ||
5a924b89 DH |
252 | /* Each transmission of a Tx packet needs a new serial number */ |
253 | serial = atomic_inc_return(&conn->serial); | |
17926a79 | 254 | |
5a924b89 DH |
255 | whdr.epoch = htonl(conn->proto.epoch); |
256 | whdr.cid = htonl(call->cid); | |
257 | whdr.callNumber = htonl(call->call_id); | |
258 | whdr.seq = htonl(sp->hdr.seq); | |
259 | whdr.serial = htonl(serial); | |
260 | whdr.type = RXRPC_PACKET_TYPE_DATA; | |
261 | whdr.flags = sp->hdr.flags; | |
262 | whdr.userStatus = 0; | |
263 | whdr.securityIndex = call->security_ix; | |
264 | whdr._rsvd = htons(sp->hdr._rsvd); | |
265 | whdr.serviceId = htons(call->service_id); | |
266 | ||
267 | iov[0].iov_base = &whdr; | |
268 | iov[0].iov_len = sizeof(whdr); | |
269 | iov[1].iov_base = skb->head; | |
270 | iov[1].iov_len = skb->len; | |
271 | len = iov[0].iov_len + iov[1].iov_len; | |
272 | ||
273 | msg.msg_name = &call->peer->srx.transport; | |
274 | msg.msg_namelen = call->peer->srx.transport_len; | |
17926a79 DH |
275 | msg.msg_control = NULL; |
276 | msg.msg_controllen = 0; | |
277 | msg.msg_flags = 0; | |
278 | ||
0d4b103c DH |
279 | /* If our RTT cache needs working on, request an ACK. */ |
280 | if ((call->peer->rtt_usage < 3 && sp->hdr.seq & 1) || | |
281 | ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), | |
282 | ktime_get_real())) | |
283 | whdr.flags |= RXRPC_REQUEST_ACK; | |
284 | ||
8a681c36 DH |
285 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
286 | static int lose; | |
287 | if ((lose++ & 7) == 7) { | |
be832aec DH |
288 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, |
289 | whdr.flags, true); | |
8a681c36 DH |
290 | rxrpc_lose_skb(skb, rxrpc_skb_tx_lost); |
291 | _leave(" = 0 [lose]"); | |
292 | return 0; | |
293 | } | |
294 | } | |
295 | ||
5a924b89 DH |
296 | _proto("Tx DATA %%%u { #%u }", serial, sp->hdr.seq); |
297 | ||
17926a79 DH |
298 | /* send the packet with the don't fragment bit set if we currently |
299 | * think it's small enough */ | |
5a924b89 DH |
300 | if (iov[1].iov_len >= call->peer->maxdata) |
301 | goto send_fragmentable; | |
302 | ||
303 | down_read(&conn->params.local->defrag_sem); | |
304 | /* send the packet by UDP | |
305 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
306 | * to go out of the interface | |
307 | * - in which case, we'll have processed the ICMP error | |
308 | * message and update the peer record | |
309 | */ | |
310 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
311 | ||
312 | up_read(&conn->params.local->defrag_sem); | |
313 | if (ret == -EMSGSIZE) | |
314 | goto send_fragmentable; | |
315 | ||
316 | done: | |
be832aec | 317 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, false); |
50235c4b | 318 | if (ret >= 0) { |
0d4b103c DH |
319 | ktime_t now = ktime_get_real(); |
320 | skb->tstamp = now; | |
50235c4b | 321 | smp_wmb(); |
5a924b89 | 322 | sp->hdr.serial = serial; |
0d4b103c DH |
323 | if (whdr.flags & RXRPC_REQUEST_ACK) { |
324 | call->peer->rtt_last_req = now; | |
50235c4b | 325 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial); |
0d4b103c | 326 | } |
17926a79 | 327 | } |
5a924b89 DH |
328 | _leave(" = %d [%u]", ret, call->peer->maxdata); |
329 | return ret; | |
17926a79 DH |
330 | |
331 | send_fragmentable: | |
332 | /* attempt to send this message with fragmentation enabled */ | |
333 | _debug("send fragment"); | |
334 | ||
985a5c82 DH |
335 | down_write(&conn->params.local->defrag_sem); |
336 | ||
337 | switch (conn->params.local->srx.transport.family) { | |
338 | case AF_INET: | |
339 | opt = IP_PMTUDISC_DONT; | |
340 | ret = kernel_setsockopt(conn->params.local->socket, | |
341 | SOL_IP, IP_MTU_DISCOVER, | |
342 | (char *)&opt, sizeof(opt)); | |
343 | if (ret == 0) { | |
5a924b89 DH |
344 | ret = kernel_sendmsg(conn->params.local->socket, &msg, |
345 | iov, 2, len); | |
985a5c82 DH |
346 | |
347 | opt = IP_PMTUDISC_DO; | |
348 | kernel_setsockopt(conn->params.local->socket, SOL_IP, | |
349 | IP_MTU_DISCOVER, | |
350 | (char *)&opt, sizeof(opt)); | |
351 | } | |
352 | break; | |
75b54cb5 | 353 | |
d1912747 | 354 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
355 | case AF_INET6: |
356 | opt = IPV6_PMTUDISC_DONT; | |
357 | ret = kernel_setsockopt(conn->params.local->socket, | |
358 | SOL_IPV6, IPV6_MTU_DISCOVER, | |
359 | (char *)&opt, sizeof(opt)); | |
360 | if (ret == 0) { | |
361 | ret = kernel_sendmsg(conn->params.local->socket, &msg, | |
362 | iov, 1, iov[0].iov_len); | |
363 | ||
364 | opt = IPV6_PMTUDISC_DO; | |
365 | kernel_setsockopt(conn->params.local->socket, | |
366 | SOL_IPV6, IPV6_MTU_DISCOVER, | |
367 | (char *)&opt, sizeof(opt)); | |
368 | } | |
369 | break; | |
d1912747 | 370 | #endif |
17926a79 DH |
371 | } |
372 | ||
985a5c82 | 373 | up_write(&conn->params.local->defrag_sem); |
5a924b89 | 374 | goto done; |
17926a79 | 375 | } |
248f219c DH |
376 | |
377 | /* | |
378 | * reject packets through the local endpoint | |
379 | */ | |
380 | void rxrpc_reject_packets(struct rxrpc_local *local) | |
381 | { | |
1c2bc7b9 | 382 | struct sockaddr_rxrpc srx; |
248f219c DH |
383 | struct rxrpc_skb_priv *sp; |
384 | struct rxrpc_wire_header whdr; | |
385 | struct sk_buff *skb; | |
386 | struct msghdr msg; | |
387 | struct kvec iov[2]; | |
388 | size_t size; | |
389 | __be32 code; | |
390 | ||
391 | _enter("%d", local->debug_id); | |
392 | ||
393 | iov[0].iov_base = &whdr; | |
394 | iov[0].iov_len = sizeof(whdr); | |
395 | iov[1].iov_base = &code; | |
396 | iov[1].iov_len = sizeof(code); | |
397 | size = sizeof(whdr) + sizeof(code); | |
398 | ||
1c2bc7b9 | 399 | msg.msg_name = &srx.transport; |
248f219c DH |
400 | msg.msg_control = NULL; |
401 | msg.msg_controllen = 0; | |
402 | msg.msg_flags = 0; | |
403 | ||
248f219c DH |
404 | memset(&whdr, 0, sizeof(whdr)); |
405 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
406 | ||
407 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
71f3ca40 | 408 | rxrpc_see_skb(skb, rxrpc_skb_rx_seen); |
248f219c | 409 | sp = rxrpc_skb(skb); |
1c2bc7b9 DH |
410 | |
411 | if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) { | |
412 | msg.msg_namelen = srx.transport_len; | |
413 | ||
248f219c DH |
414 | code = htonl(skb->priority); |
415 | ||
416 | whdr.epoch = htonl(sp->hdr.epoch); | |
417 | whdr.cid = htonl(sp->hdr.cid); | |
418 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
419 | whdr.serviceId = htons(sp->hdr.serviceId); | |
420 | whdr.flags = sp->hdr.flags; | |
421 | whdr.flags ^= RXRPC_CLIENT_INITIATED; | |
422 | whdr.flags &= RXRPC_CLIENT_INITIATED; | |
423 | ||
424 | kernel_sendmsg(local->socket, &msg, iov, 2, size); | |
248f219c DH |
425 | } |
426 | ||
71f3ca40 | 427 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
248f219c DH |
428 | } |
429 | ||
430 | _leave(""); | |
431 | } |