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Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
17926a79 DH |
2 | /* RxRPC packet transmission |
3 | * | |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. | |
5 | * Written by David Howells (dhowells@redhat.com) | |
17926a79 DH |
6 | */ |
7 | ||
9b6d5398 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
17926a79 | 10 | #include <linux/net.h> |
5a0e3ad6 | 11 | #include <linux/gfp.h> |
17926a79 | 12 | #include <linux/skbuff.h> |
bc3b2d7f | 13 | #include <linux/export.h> |
17926a79 DH |
14 | #include <net/sock.h> |
15 | #include <net/af_rxrpc.h> | |
16 | #include "ar-internal.h" | |
17 | ||
26cb02aa | 18 | struct rxrpc_ack_buffer { |
8d94aa38 | 19 | struct rxrpc_wire_header whdr; |
26cb02aa DH |
20 | struct rxrpc_ackpacket ack; |
21 | u8 acks[255]; | |
22 | u8 pad[3]; | |
8d94aa38 DH |
23 | struct rxrpc_ackinfo ackinfo; |
24 | }; | |
25 | ||
26cb02aa DH |
26 | struct rxrpc_abort_buffer { |
27 | struct rxrpc_wire_header whdr; | |
28 | __be32 abort_code; | |
29 | }; | |
30 | ||
ace45bec DH |
31 | static const char rxrpc_keepalive_string[] = ""; |
32 | ||
c7e86acf DH |
33 | /* |
34 | * Increase Tx backoff on transmission failure and clear it on success. | |
35 | */ | |
36 | static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret) | |
37 | { | |
38 | if (ret < 0) { | |
39 | u16 tx_backoff = READ_ONCE(call->tx_backoff); | |
40 | ||
41 | if (tx_backoff < HZ) | |
42 | WRITE_ONCE(call->tx_backoff, tx_backoff + 1); | |
43 | } else { | |
44 | WRITE_ONCE(call->tx_backoff, 0); | |
45 | } | |
46 | } | |
47 | ||
415f44e4 DH |
48 | /* |
49 | * Arrange for a keepalive ping a certain time after we last transmitted. This | |
50 | * lets the far side know we're still interested in this call and helps keep | |
51 | * the route through any intervening firewall open. | |
52 | * | |
53 | * Receiving a response to the ping will prevent the ->expect_rx_by timer from | |
54 | * expiring. | |
55 | */ | |
56 | static void rxrpc_set_keepalive(struct rxrpc_call *call) | |
57 | { | |
58 | unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6; | |
59 | ||
60 | keepalive_at += now; | |
61 | WRITE_ONCE(call->keepalive_at, keepalive_at); | |
62 | rxrpc_reduce_call_timer(call, keepalive_at, now, | |
63 | rxrpc_timer_set_for_keepalive); | |
64 | } | |
65 | ||
8d94aa38 DH |
66 | /* |
67 | * Fill out an ACK packet. | |
68 | */ | |
1457cc4c DH |
69 | static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn, |
70 | struct rxrpc_call *call, | |
26cb02aa | 71 | struct rxrpc_ack_buffer *pkt, |
805b21b9 | 72 | rxrpc_seq_t *_hard_ack, |
a5af7e1f DH |
73 | rxrpc_seq_t *_top, |
74 | u8 reason) | |
8d94aa38 | 75 | { |
f3639df2 | 76 | rxrpc_serial_t serial; |
248f219c DH |
77 | rxrpc_seq_t hard_ack, top, seq; |
78 | int ix; | |
8d94aa38 DH |
79 | u32 mtu, jmax; |
80 | u8 *ackp = pkt->acks; | |
81 | ||
248f219c | 82 | /* Barrier against rxrpc_input_data(). */ |
f3639df2 | 83 | serial = call->ackr_serial; |
248f219c DH |
84 | hard_ack = READ_ONCE(call->rx_hard_ack); |
85 | top = smp_load_acquire(&call->rx_top); | |
805b21b9 DH |
86 | *_hard_ack = hard_ack; |
87 | *_top = top; | |
248f219c | 88 | |
8d94aa38 | 89 | pkt->ack.bufferSpace = htons(8); |
e8c3af6b | 90 | pkt->ack.maxSkew = htons(0); |
248f219c | 91 | pkt->ack.firstPacket = htonl(hard_ack + 1); |
8d94aa38 | 92 | pkt->ack.previousPacket = htonl(call->ackr_prev_seq); |
f3639df2 | 93 | pkt->ack.serial = htonl(serial); |
a5af7e1f | 94 | pkt->ack.reason = reason; |
248f219c DH |
95 | pkt->ack.nAcks = top - hard_ack; |
96 | ||
a5af7e1f | 97 | if (reason == RXRPC_ACK_PING) |
8e83134d DH |
98 | pkt->whdr.flags |= RXRPC_REQUEST_ACK; |
99 | ||
248f219c DH |
100 | if (after(top, hard_ack)) { |
101 | seq = hard_ack + 1; | |
102 | do { | |
103 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
104 | if (call->rxtx_buffer[ix]) | |
105 | *ackp++ = RXRPC_ACK_TYPE_ACK; | |
106 | else | |
107 | *ackp++ = RXRPC_ACK_TYPE_NACK; | |
108 | seq++; | |
109 | } while (before_eq(seq, top)); | |
110 | } | |
8d94aa38 | 111 | |
1457cc4c DH |
112 | mtu = conn->params.peer->if_mtu; |
113 | mtu -= conn->params.peer->hdrsize; | |
75e42126 | 114 | jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max; |
8d94aa38 DH |
115 | pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
116 | pkt->ackinfo.maxMTU = htonl(mtu); | |
75e42126 | 117 | pkt->ackinfo.rwind = htonl(call->rx_winsize); |
8d94aa38 DH |
118 | pkt->ackinfo.jumbo_max = htonl(jmax); |
119 | ||
120 | *ackp++ = 0; | |
121 | *ackp++ = 0; | |
122 | *ackp++ = 0; | |
248f219c | 123 | return top - hard_ack + 3; |
8d94aa38 DH |
124 | } |
125 | ||
126 | /* | |
26cb02aa | 127 | * Send an ACK call packet. |
8d94aa38 | 128 | */ |
bd1fdf8c DH |
129 | int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping, |
130 | rxrpc_serial_t *_serial) | |
8d94aa38 | 131 | { |
5273a191 | 132 | struct rxrpc_connection *conn; |
26cb02aa | 133 | struct rxrpc_ack_buffer *pkt; |
8d94aa38 DH |
134 | struct msghdr msg; |
135 | struct kvec iov[2]; | |
136 | rxrpc_serial_t serial; | |
805b21b9 | 137 | rxrpc_seq_t hard_ack, top; |
8d94aa38 | 138 | size_t len, n; |
26cb02aa | 139 | int ret; |
a5af7e1f | 140 | u8 reason; |
8d94aa38 | 141 | |
5273a191 | 142 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
8d94aa38 DH |
143 | return -ECONNRESET; |
144 | ||
145 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
5273a191 | 146 | if (!pkt) |
8d94aa38 | 147 | return -ENOMEM; |
5273a191 DH |
148 | |
149 | conn = call->conn; | |
8d94aa38 | 150 | |
8d94aa38 DH |
151 | msg.msg_name = &call->peer->srx.transport; |
152 | msg.msg_namelen = call->peer->srx.transport_len; | |
153 | msg.msg_control = NULL; | |
154 | msg.msg_controllen = 0; | |
155 | msg.msg_flags = 0; | |
156 | ||
157 | pkt->whdr.epoch = htonl(conn->proto.epoch); | |
158 | pkt->whdr.cid = htonl(call->cid); | |
159 | pkt->whdr.callNumber = htonl(call->call_id); | |
160 | pkt->whdr.seq = 0; | |
26cb02aa DH |
161 | pkt->whdr.type = RXRPC_PACKET_TYPE_ACK; |
162 | pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag; | |
8d94aa38 DH |
163 | pkt->whdr.userStatus = 0; |
164 | pkt->whdr.securityIndex = call->security_ix; | |
165 | pkt->whdr._rsvd = 0; | |
166 | pkt->whdr.serviceId = htons(call->service_id); | |
167 | ||
26cb02aa | 168 | spin_lock_bh(&call->lock); |
a5af7e1f DH |
169 | if (ping) { |
170 | reason = RXRPC_ACK_PING; | |
171 | } else { | |
172 | reason = call->ackr_reason; | |
173 | if (!call->ackr_reason) { | |
174 | spin_unlock_bh(&call->lock); | |
175 | ret = 0; | |
176 | goto out; | |
177 | } | |
178 | call->ackr_reason = 0; | |
8d94aa38 | 179 | } |
1457cc4c | 180 | n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason); |
26cb02aa DH |
181 | |
182 | spin_unlock_bh(&call->lock); | |
183 | ||
184 | iov[0].iov_base = pkt; | |
185 | iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n; | |
186 | iov[1].iov_base = &pkt->ackinfo; | |
187 | iov[1].iov_len = sizeof(pkt->ackinfo); | |
188 | len = iov[0].iov_len + iov[1].iov_len; | |
8d94aa38 | 189 | |
b86e218e DH |
190 | serial = atomic_inc_return(&conn->serial); |
191 | pkt->whdr.serial = htonl(serial); | |
4764c0da | 192 | trace_rxrpc_tx_ack(call->debug_id, serial, |
26cb02aa DH |
193 | ntohl(pkt->ack.firstPacket), |
194 | ntohl(pkt->ack.serial), | |
195 | pkt->ack.reason, pkt->ack.nAcks); | |
bd1fdf8c DH |
196 | if (_serial) |
197 | *_serial = serial; | |
b86e218e | 198 | |
8e83134d | 199 | if (ping) { |
a5af7e1f | 200 | call->ping_serial = serial; |
8e83134d DH |
201 | smp_wmb(); |
202 | /* We need to stick a time in before we send the packet in case | |
203 | * the reply gets back before kernel_sendmsg() completes - but | |
204 | * asking UDP to send the packet can take a relatively long | |
b604dd98 | 205 | * time. |
8e83134d | 206 | */ |
a5af7e1f | 207 | call->ping_time = ktime_get_real(); |
8e83134d DH |
208 | set_bit(RXRPC_CALL_PINGING, &call->flags); |
209 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial); | |
210 | } | |
26cb02aa DH |
211 | |
212 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
330bdcfa | 213 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
6b47fe1d DH |
214 | if (ret < 0) |
215 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
4764c0da DH |
216 | rxrpc_tx_point_call_ack); |
217 | else | |
218 | trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr, | |
219 | rxrpc_tx_point_call_ack); | |
c7e86acf | 220 | rxrpc_tx_backoff(call, ret); |
8d94aa38 | 221 | |
26cb02aa | 222 | if (call->state < RXRPC_CALL_COMPLETE) { |
805b21b9 | 223 | if (ret < 0) { |
a5af7e1f DH |
224 | if (ping) |
225 | clear_bit(RXRPC_CALL_PINGING, &call->flags); | |
248f219c | 226 | rxrpc_propose_ACK(call, pkt->ack.reason, |
248f219c | 227 | ntohl(pkt->ack.serial), |
c7e86acf | 228 | false, true, |
9c7ad434 | 229 | rxrpc_propose_ack_retry_tx); |
805b21b9 DH |
230 | } else { |
231 | spin_lock_bh(&call->lock); | |
232 | if (after(hard_ack, call->ackr_consumed)) | |
233 | call->ackr_consumed = hard_ack; | |
234 | if (after(top, call->ackr_seen)) | |
235 | call->ackr_seen = top; | |
236 | spin_unlock_bh(&call->lock); | |
248f219c | 237 | } |
415f44e4 DH |
238 | |
239 | rxrpc_set_keepalive(call); | |
248f219c DH |
240 | } |
241 | ||
8d94aa38 | 242 | out: |
8d94aa38 DH |
243 | kfree(pkt); |
244 | return ret; | |
245 | } | |
246 | ||
26cb02aa DH |
247 | /* |
248 | * Send an ABORT call packet. | |
249 | */ | |
250 | int rxrpc_send_abort_packet(struct rxrpc_call *call) | |
251 | { | |
5273a191 | 252 | struct rxrpc_connection *conn; |
26cb02aa DH |
253 | struct rxrpc_abort_buffer pkt; |
254 | struct msghdr msg; | |
255 | struct kvec iov[1]; | |
256 | rxrpc_serial_t serial; | |
257 | int ret; | |
258 | ||
dcbefc30 DH |
259 | /* Don't bother sending aborts for a client call once the server has |
260 | * hard-ACK'd all of its request data. After that point, we're not | |
261 | * going to stop the operation proceeding, and whilst we might limit | |
262 | * the reply, it's not worth it if we can send a new call on the same | |
263 | * channel instead, thereby closing off this call. | |
264 | */ | |
265 | if (rxrpc_is_client_call(call) && | |
266 | test_bit(RXRPC_CALL_TX_LAST, &call->flags)) | |
267 | return 0; | |
268 | ||
5273a191 | 269 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
26cb02aa DH |
270 | return -ECONNRESET; |
271 | ||
5273a191 DH |
272 | conn = call->conn; |
273 | ||
26cb02aa DH |
274 | msg.msg_name = &call->peer->srx.transport; |
275 | msg.msg_namelen = call->peer->srx.transport_len; | |
276 | msg.msg_control = NULL; | |
277 | msg.msg_controllen = 0; | |
278 | msg.msg_flags = 0; | |
279 | ||
280 | pkt.whdr.epoch = htonl(conn->proto.epoch); | |
281 | pkt.whdr.cid = htonl(call->cid); | |
282 | pkt.whdr.callNumber = htonl(call->call_id); | |
283 | pkt.whdr.seq = 0; | |
284 | pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
285 | pkt.whdr.flags = conn->out_clientflag; | |
286 | pkt.whdr.userStatus = 0; | |
287 | pkt.whdr.securityIndex = call->security_ix; | |
288 | pkt.whdr._rsvd = 0; | |
289 | pkt.whdr.serviceId = htons(call->service_id); | |
290 | pkt.abort_code = htonl(call->abort_code); | |
291 | ||
292 | iov[0].iov_base = &pkt; | |
293 | iov[0].iov_len = sizeof(pkt); | |
294 | ||
295 | serial = atomic_inc_return(&conn->serial); | |
296 | pkt.whdr.serial = htonl(serial); | |
297 | ||
298 | ret = kernel_sendmsg(conn->params.local->socket, | |
299 | &msg, iov, 1, sizeof(pkt)); | |
330bdcfa | 300 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
6b47fe1d DH |
301 | if (ret < 0) |
302 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
4764c0da DH |
303 | rxrpc_tx_point_call_abort); |
304 | else | |
305 | trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr, | |
306 | rxrpc_tx_point_call_abort); | |
c7e86acf | 307 | rxrpc_tx_backoff(call, ret); |
26cb02aa DH |
308 | return ret; |
309 | } | |
310 | ||
17926a79 DH |
311 | /* |
312 | * send a packet through the transport endpoint | |
313 | */ | |
a1767077 DH |
314 | int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb, |
315 | bool retrans) | |
17926a79 | 316 | { |
5a924b89 DH |
317 | struct rxrpc_connection *conn = call->conn; |
318 | struct rxrpc_wire_header whdr; | |
319 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
17926a79 | 320 | struct msghdr msg; |
5a924b89 DH |
321 | struct kvec iov[2]; |
322 | rxrpc_serial_t serial; | |
323 | size_t len; | |
17926a79 DH |
324 | int ret, opt; |
325 | ||
326 | _enter(",{%d}", skb->len); | |
327 | ||
5a924b89 DH |
328 | /* Each transmission of a Tx packet needs a new serial number */ |
329 | serial = atomic_inc_return(&conn->serial); | |
17926a79 | 330 | |
5a924b89 DH |
331 | whdr.epoch = htonl(conn->proto.epoch); |
332 | whdr.cid = htonl(call->cid); | |
333 | whdr.callNumber = htonl(call->call_id); | |
334 | whdr.seq = htonl(sp->hdr.seq); | |
335 | whdr.serial = htonl(serial); | |
336 | whdr.type = RXRPC_PACKET_TYPE_DATA; | |
337 | whdr.flags = sp->hdr.flags; | |
338 | whdr.userStatus = 0; | |
339 | whdr.securityIndex = call->security_ix; | |
340 | whdr._rsvd = htons(sp->hdr._rsvd); | |
341 | whdr.serviceId = htons(call->service_id); | |
342 | ||
4e255721 DH |
343 | if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && |
344 | sp->hdr.seq == 1) | |
345 | whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; | |
346 | ||
5a924b89 DH |
347 | iov[0].iov_base = &whdr; |
348 | iov[0].iov_len = sizeof(whdr); | |
349 | iov[1].iov_base = skb->head; | |
350 | iov[1].iov_len = skb->len; | |
351 | len = iov[0].iov_len + iov[1].iov_len; | |
352 | ||
353 | msg.msg_name = &call->peer->srx.transport; | |
354 | msg.msg_namelen = call->peer->srx.transport_len; | |
17926a79 DH |
355 | msg.msg_control = NULL; |
356 | msg.msg_controllen = 0; | |
357 | msg.msg_flags = 0; | |
358 | ||
57494343 DH |
359 | /* If our RTT cache needs working on, request an ACK. Also request |
360 | * ACKs if a DATA packet appears to have been lost. | |
b604dd98 DH |
361 | * |
362 | * However, we mustn't request an ACK on the last reply packet of a | |
363 | * service call, lest OpenAFS incorrectly send us an ACK with some | |
364 | * soft-ACKs in it and then never follow up with a proper hard ACK. | |
57494343 | 365 | */ |
b604dd98 DH |
366 | if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) || |
367 | rxrpc_to_server(sp) | |
368 | ) && | |
bd1fdf8c DH |
369 | (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) || |
370 | retrans || | |
bf7d620a DH |
371 | call->cong_mode == RXRPC_CALL_SLOW_START || |
372 | (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) || | |
373 | ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), | |
374 | ktime_get_real()))) | |
0d4b103c DH |
375 | whdr.flags |= RXRPC_REQUEST_ACK; |
376 | ||
8a681c36 DH |
377 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
378 | static int lose; | |
379 | if ((lose++ & 7) == 7) { | |
a1767077 | 380 | ret = 0; |
526949e8 AB |
381 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, |
382 | whdr.flags, retrans, true); | |
383 | goto done; | |
8a681c36 DH |
384 | } |
385 | } | |
386 | ||
526949e8 AB |
387 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans, |
388 | false); | |
5a924b89 | 389 | |
17926a79 DH |
390 | /* send the packet with the don't fragment bit set if we currently |
391 | * think it's small enough */ | |
5a924b89 DH |
392 | if (iov[1].iov_len >= call->peer->maxdata) |
393 | goto send_fragmentable; | |
394 | ||
395 | down_read(&conn->params.local->defrag_sem); | |
b604dd98 DH |
396 | |
397 | sp->hdr.serial = serial; | |
398 | smp_wmb(); /* Set serial before timestamp */ | |
399 | skb->tstamp = ktime_get_real(); | |
400 | ||
5a924b89 DH |
401 | /* send the packet by UDP |
402 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
403 | * to go out of the interface | |
404 | * - in which case, we'll have processed the ICMP error | |
405 | * message and update the peer record | |
406 | */ | |
407 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
330bdcfa | 408 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
5a924b89 DH |
409 | |
410 | up_read(&conn->params.local->defrag_sem); | |
6b47fe1d DH |
411 | if (ret < 0) |
412 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
4764c0da DH |
413 | rxrpc_tx_point_call_data_nofrag); |
414 | else | |
415 | trace_rxrpc_tx_packet(call->debug_id, &whdr, | |
416 | rxrpc_tx_point_call_data_nofrag); | |
c7e86acf | 417 | rxrpc_tx_backoff(call, ret); |
5a924b89 DH |
418 | if (ret == -EMSGSIZE) |
419 | goto send_fragmentable; | |
420 | ||
421 | done: | |
50235c4b | 422 | if (ret >= 0) { |
0d4b103c | 423 | if (whdr.flags & RXRPC_REQUEST_ACK) { |
b604dd98 | 424 | call->peer->rtt_last_req = skb->tstamp; |
50235c4b | 425 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial); |
bd1fdf8c DH |
426 | if (call->peer->rtt_usage > 1) { |
427 | unsigned long nowj = jiffies, ack_lost_at; | |
428 | ||
429 | ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt); | |
430 | if (ack_lost_at < 1) | |
431 | ack_lost_at = 1; | |
432 | ||
433 | ack_lost_at += nowj; | |
434 | WRITE_ONCE(call->ack_lost_at, ack_lost_at); | |
435 | rxrpc_reduce_call_timer(call, ack_lost_at, nowj, | |
436 | rxrpc_timer_set_for_lost_ack); | |
437 | } | |
0d4b103c | 438 | } |
c54e43d7 DH |
439 | |
440 | if (sp->hdr.seq == 1 && | |
441 | !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, | |
442 | &call->flags)) { | |
443 | unsigned long nowj = jiffies, expect_rx_by; | |
444 | ||
445 | expect_rx_by = nowj + call->next_rx_timo; | |
446 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); | |
447 | rxrpc_reduce_call_timer(call, expect_rx_by, nowj, | |
448 | rxrpc_timer_set_for_normal); | |
449 | } | |
415f44e4 | 450 | |
c7e86acf DH |
451 | rxrpc_set_keepalive(call); |
452 | } else { | |
453 | /* Cancel the call if the initial transmission fails, | |
454 | * particularly if that's due to network routing issues that | |
455 | * aren't going away anytime soon. The layer above can arrange | |
456 | * the retransmission. | |
457 | */ | |
458 | if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags)) | |
459 | rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
460 | RX_USER_ABORT, ret); | |
461 | } | |
415f44e4 | 462 | |
5a924b89 DH |
463 | _leave(" = %d [%u]", ret, call->peer->maxdata); |
464 | return ret; | |
17926a79 DH |
465 | |
466 | send_fragmentable: | |
467 | /* attempt to send this message with fragmentation enabled */ | |
468 | _debug("send fragment"); | |
469 | ||
985a5c82 DH |
470 | down_write(&conn->params.local->defrag_sem); |
471 | ||
b604dd98 DH |
472 | sp->hdr.serial = serial; |
473 | smp_wmb(); /* Set serial before timestamp */ | |
474 | skb->tstamp = ktime_get_real(); | |
475 | ||
985a5c82 DH |
476 | switch (conn->params.local->srx.transport.family) { |
477 | case AF_INET: | |
478 | opt = IP_PMTUDISC_DONT; | |
479 | ret = kernel_setsockopt(conn->params.local->socket, | |
480 | SOL_IP, IP_MTU_DISCOVER, | |
481 | (char *)&opt, sizeof(opt)); | |
482 | if (ret == 0) { | |
5a924b89 DH |
483 | ret = kernel_sendmsg(conn->params.local->socket, &msg, |
484 | iov, 2, len); | |
330bdcfa | 485 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
985a5c82 DH |
486 | |
487 | opt = IP_PMTUDISC_DO; | |
488 | kernel_setsockopt(conn->params.local->socket, SOL_IP, | |
489 | IP_MTU_DISCOVER, | |
490 | (char *)&opt, sizeof(opt)); | |
491 | } | |
492 | break; | |
75b54cb5 | 493 | |
d1912747 | 494 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
495 | case AF_INET6: |
496 | opt = IPV6_PMTUDISC_DONT; | |
497 | ret = kernel_setsockopt(conn->params.local->socket, | |
498 | SOL_IPV6, IPV6_MTU_DISCOVER, | |
499 | (char *)&opt, sizeof(opt)); | |
500 | if (ret == 0) { | |
501 | ret = kernel_sendmsg(conn->params.local->socket, &msg, | |
93c62c45 | 502 | iov, 2, len); |
330bdcfa | 503 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
75b54cb5 DH |
504 | |
505 | opt = IPV6_PMTUDISC_DO; | |
506 | kernel_setsockopt(conn->params.local->socket, | |
507 | SOL_IPV6, IPV6_MTU_DISCOVER, | |
508 | (char *)&opt, sizeof(opt)); | |
509 | } | |
510 | break; | |
d1912747 | 511 | #endif |
3427beb6 DH |
512 | |
513 | default: | |
514 | BUG(); | |
17926a79 DH |
515 | } |
516 | ||
6b47fe1d DH |
517 | if (ret < 0) |
518 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
4764c0da DH |
519 | rxrpc_tx_point_call_data_frag); |
520 | else | |
521 | trace_rxrpc_tx_packet(call->debug_id, &whdr, | |
522 | rxrpc_tx_point_call_data_frag); | |
c7e86acf | 523 | rxrpc_tx_backoff(call, ret); |
6b47fe1d | 524 | |
985a5c82 | 525 | up_write(&conn->params.local->defrag_sem); |
5a924b89 | 526 | goto done; |
17926a79 | 527 | } |
248f219c DH |
528 | |
529 | /* | |
530 | * reject packets through the local endpoint | |
531 | */ | |
532 | void rxrpc_reject_packets(struct rxrpc_local *local) | |
533 | { | |
1c2bc7b9 | 534 | struct sockaddr_rxrpc srx; |
248f219c DH |
535 | struct rxrpc_skb_priv *sp; |
536 | struct rxrpc_wire_header whdr; | |
537 | struct sk_buff *skb; | |
538 | struct msghdr msg; | |
539 | struct kvec iov[2]; | |
540 | size_t size; | |
541 | __be32 code; | |
ece64fec | 542 | int ret, ioc; |
248f219c DH |
543 | |
544 | _enter("%d", local->debug_id); | |
545 | ||
546 | iov[0].iov_base = &whdr; | |
547 | iov[0].iov_len = sizeof(whdr); | |
548 | iov[1].iov_base = &code; | |
549 | iov[1].iov_len = sizeof(code); | |
248f219c | 550 | |
1c2bc7b9 | 551 | msg.msg_name = &srx.transport; |
248f219c DH |
552 | msg.msg_control = NULL; |
553 | msg.msg_controllen = 0; | |
554 | msg.msg_flags = 0; | |
555 | ||
248f219c | 556 | memset(&whdr, 0, sizeof(whdr)); |
248f219c DH |
557 | |
558 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
987db9f7 | 559 | rxrpc_see_skb(skb, rxrpc_skb_seen); |
248f219c | 560 | sp = rxrpc_skb(skb); |
1c2bc7b9 | 561 | |
ece64fec DH |
562 | switch (skb->mark) { |
563 | case RXRPC_SKB_MARK_REJECT_BUSY: | |
564 | whdr.type = RXRPC_PACKET_TYPE_BUSY; | |
565 | size = sizeof(whdr); | |
566 | ioc = 1; | |
567 | break; | |
568 | case RXRPC_SKB_MARK_REJECT_ABORT: | |
569 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
570 | code = htonl(skb->priority); | |
571 | size = sizeof(whdr) + sizeof(code); | |
572 | ioc = 2; | |
573 | break; | |
574 | default: | |
987db9f7 | 575 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
ece64fec DH |
576 | continue; |
577 | } | |
578 | ||
5a790b73 | 579 | if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) { |
1c2bc7b9 DH |
580 | msg.msg_namelen = srx.transport_len; |
581 | ||
248f219c DH |
582 | whdr.epoch = htonl(sp->hdr.epoch); |
583 | whdr.cid = htonl(sp->hdr.cid); | |
584 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
585 | whdr.serviceId = htons(sp->hdr.serviceId); | |
586 | whdr.flags = sp->hdr.flags; | |
587 | whdr.flags ^= RXRPC_CLIENT_INITIATED; | |
588 | whdr.flags &= RXRPC_CLIENT_INITIATED; | |
589 | ||
d6672a5a Y |
590 | ret = kernel_sendmsg(local->socket, &msg, |
591 | iov, ioc, size); | |
6b47fe1d DH |
592 | if (ret < 0) |
593 | trace_rxrpc_tx_fail(local->debug_id, 0, ret, | |
4764c0da DH |
594 | rxrpc_tx_point_reject); |
595 | else | |
596 | trace_rxrpc_tx_packet(local->debug_id, &whdr, | |
597 | rxrpc_tx_point_reject); | |
248f219c DH |
598 | } |
599 | ||
987db9f7 | 600 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
248f219c DH |
601 | } |
602 | ||
603 | _leave(""); | |
604 | } | |
ace45bec DH |
605 | |
606 | /* | |
607 | * Send a VERSION reply to a peer as a keepalive. | |
608 | */ | |
609 | void rxrpc_send_keepalive(struct rxrpc_peer *peer) | |
610 | { | |
611 | struct rxrpc_wire_header whdr; | |
612 | struct msghdr msg; | |
613 | struct kvec iov[2]; | |
614 | size_t len; | |
615 | int ret; | |
616 | ||
617 | _enter(""); | |
618 | ||
619 | msg.msg_name = &peer->srx.transport; | |
620 | msg.msg_namelen = peer->srx.transport_len; | |
621 | msg.msg_control = NULL; | |
622 | msg.msg_controllen = 0; | |
623 | msg.msg_flags = 0; | |
624 | ||
625 | whdr.epoch = htonl(peer->local->rxnet->epoch); | |
626 | whdr.cid = 0; | |
627 | whdr.callNumber = 0; | |
628 | whdr.seq = 0; | |
629 | whdr.serial = 0; | |
630 | whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ | |
631 | whdr.flags = RXRPC_LAST_PACKET; | |
632 | whdr.userStatus = 0; | |
633 | whdr.securityIndex = 0; | |
634 | whdr._rsvd = 0; | |
635 | whdr.serviceId = 0; | |
636 | ||
637 | iov[0].iov_base = &whdr; | |
638 | iov[0].iov_len = sizeof(whdr); | |
639 | iov[1].iov_base = (char *)rxrpc_keepalive_string; | |
640 | iov[1].iov_len = sizeof(rxrpc_keepalive_string); | |
641 | ||
642 | len = iov[0].iov_len + iov[1].iov_len; | |
643 | ||
644 | _proto("Tx VERSION (keepalive)"); | |
645 | ||
646 | ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len); | |
647 | if (ret < 0) | |
6b47fe1d | 648 | trace_rxrpc_tx_fail(peer->debug_id, 0, ret, |
4764c0da DH |
649 | rxrpc_tx_point_version_keepalive); |
650 | else | |
651 | trace_rxrpc_tx_packet(peer->debug_id, &whdr, | |
652 | rxrpc_tx_point_version_keepalive); | |
ace45bec | 653 | |
330bdcfa | 654 | peer->last_tx_at = ktime_get_seconds(); |
ace45bec DH |
655 | _leave(""); |
656 | } |