1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* RxRPC packet transmission |
3 | * |
4 | * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. |
5 | * Written by David Howells (dhowells@redhat.com) |
6 | */ |
7 | |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | |
10 | #include <linux/net.h> |
11 | #include <linux/gfp.h> |
12 | #include <linux/skbuff.h> |
13 | #include <linux/export.h> |
14 | #include <net/sock.h> |
15 | #include <net/af_rxrpc.h> |
16 | #include <net/udp.h> |
17 | #include "ar-internal.h" |
18 | |
19 | extern int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len); |
20 | |
21 | static ssize_t do_udp_sendmsg(struct socket *socket, struct msghdr *msg, size_t len) |
22 | { |
23 | struct sockaddr *sa = msg->msg_name; |
24 | struct sock *sk = socket->sk; |
25 | |
26 | if (IS_ENABLED(CONFIG_AF_RXRPC_IPV6)) { |
27 | if (sa->sa_family == AF_INET6) { |
28 | if (sk->sk_family != AF_INET6) { |
29 | pr_warn("AF_INET6 address on AF_INET socket\n" ); |
30 | return -ENOPROTOOPT; |
31 | } |
32 | return udpv6_sendmsg(sk, msg, len); |
33 | } |
34 | } |
35 | return udp_sendmsg(sk, msg, len); |
36 | } |
37 | |
38 | struct rxrpc_abort_buffer { |
39 | struct rxrpc_wire_header whdr; |
40 | __be32 abort_code; |
41 | }; |
42 | |
43 | static const char rxrpc_keepalive_string[] = "" ; |
44 | |
45 | /* |
46 | * Increase Tx backoff on transmission failure and clear it on success. |
47 | */ |
48 | static void rxrpc_tx_backoff(struct rxrpc_call *call, int ret) |
49 | { |
50 | if (ret < 0) { |
51 | if (call->tx_backoff < 1000) |
52 | call->tx_backoff += 100; |
53 | } else { |
54 | call->tx_backoff = 0; |
55 | } |
56 | } |
57 | |
58 | /* |
59 | * Arrange for a keepalive ping a certain time after we last transmitted. This |
60 | * lets the far side know we're still interested in this call and helps keep |
61 | * the route through any intervening firewall open. |
62 | * |
63 | * Receiving a response to the ping will prevent the ->expect_rx_by timer from |
64 | * expiring. |
65 | */ |
66 | static void rxrpc_set_keepalive(struct rxrpc_call *call, ktime_t now) |
67 | { |
68 | ktime_t delay = ms_to_ktime(READ_ONCE(call->next_rx_timo) / 6); |
69 | |
70 | call->keepalive_at = ktime_add(ktime_get_real(), delay); |
71 | trace_rxrpc_timer_set(call, delay, why: rxrpc_timer_trace_keepalive); |
72 | } |
73 | |
74 | /* |
75 | * Fill out an ACK packet. |
76 | */ |
77 | static void rxrpc_fill_out_ack(struct rxrpc_call *call, |
78 | struct rxrpc_txbuf *txb, |
79 | u8 ack_reason, |
80 | rxrpc_serial_t serial) |
81 | { |
82 | struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base; |
83 | struct rxrpc_acktrailer *trailer = txb->kvec[2].iov_base + 3; |
84 | struct rxrpc_ackpacket *ack = (struct rxrpc_ackpacket *)(whdr + 1); |
85 | unsigned int qsize, sack, wrap, to; |
86 | rxrpc_seq_t window, wtop; |
87 | int rsize; |
88 | u32 mtu, jmax; |
89 | u8 *filler = txb->kvec[2].iov_base; |
90 | u8 *sackp = txb->kvec[1].iov_base; |
91 | |
92 | rxrpc_inc_stat(call->rxnet, stat_tx_ack_fill); |
93 | |
94 | window = call->ackr_window; |
95 | wtop = call->ackr_wtop; |
96 | sack = call->ackr_sack_base % RXRPC_SACK_SIZE; |
97 | |
98 | whdr->seq = 0; |
99 | whdr->type = RXRPC_PACKET_TYPE_ACK; |
100 | txb->flags |= RXRPC_SLOW_START_OK; |
101 | ack->bufferSpace = 0; |
102 | ack->maxSkew = 0; |
103 | ack->firstPacket = htonl(window); |
104 | ack->previousPacket = htonl(call->rx_highest_seq); |
105 | ack->serial = htonl(serial); |
106 | ack->reason = ack_reason; |
107 | ack->nAcks = wtop - window; |
108 | filler[0] = 0; |
109 | filler[1] = 0; |
110 | filler[2] = 0; |
111 | |
112 | if (ack_reason == RXRPC_ACK_PING) |
113 | txb->flags |= RXRPC_REQUEST_ACK; |
114 | |
115 | if (after(seq1: wtop, seq2: window)) { |
116 | txb->len += ack->nAcks; |
117 | txb->kvec[1].iov_base = sackp; |
118 | txb->kvec[1].iov_len = ack->nAcks; |
119 | |
120 | wrap = RXRPC_SACK_SIZE - sack; |
121 | to = min_t(unsigned int, ack->nAcks, RXRPC_SACK_SIZE); |
122 | |
123 | if (sack + ack->nAcks <= RXRPC_SACK_SIZE) { |
124 | memcpy(sackp, call->ackr_sack_table + sack, ack->nAcks); |
125 | } else { |
126 | memcpy(sackp, call->ackr_sack_table + sack, wrap); |
127 | memcpy(sackp + wrap, call->ackr_sack_table, to - wrap); |
128 | } |
129 | } else if (before(seq1: wtop, seq2: window)) { |
130 | pr_warn("ack window backward %x %x" , window, wtop); |
131 | } else if (ack->reason == RXRPC_ACK_DELAY) { |
132 | ack->reason = RXRPC_ACK_IDLE; |
133 | } |
134 | |
135 | mtu = call->peer->if_mtu; |
136 | mtu -= call->peer->hdrsize; |
137 | jmax = rxrpc_rx_jumbo_max; |
138 | qsize = (window - 1) - call->rx_consumed; |
139 | rsize = max_t(int, call->rx_winsize - qsize, 0); |
140 | txb->ack_rwind = rsize; |
141 | trailer->maxMTU = htonl(rxrpc_rx_mtu); |
142 | trailer->ifMTU = htonl(mtu); |
143 | trailer->rwind = htonl(rsize); |
144 | trailer->jumbo_max = htonl(jmax); |
145 | } |
146 | |
147 | /* |
148 | * Record the beginning of an RTT probe. |
149 | */ |
150 | static void rxrpc_begin_rtt_probe(struct rxrpc_call *call, rxrpc_serial_t serial, |
151 | ktime_t now, enum rxrpc_rtt_tx_trace why) |
152 | { |
153 | unsigned long avail = call->rtt_avail; |
154 | int rtt_slot = 9; |
155 | |
156 | if (!(avail & RXRPC_CALL_RTT_AVAIL_MASK)) |
157 | goto no_slot; |
158 | |
159 | rtt_slot = __ffs(avail & RXRPC_CALL_RTT_AVAIL_MASK); |
160 | if (!test_and_clear_bit(nr: rtt_slot, addr: &call->rtt_avail)) |
161 | goto no_slot; |
162 | |
163 | call->rtt_serial[rtt_slot] = serial; |
164 | call->rtt_sent_at[rtt_slot] = now; |
165 | smp_wmb(); /* Write data before avail bit */ |
166 | set_bit(nr: rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, addr: &call->rtt_avail); |
167 | |
168 | trace_rxrpc_rtt_tx(call, why, slot: rtt_slot, send_serial: serial); |
169 | return; |
170 | |
171 | no_slot: |
172 | trace_rxrpc_rtt_tx(call, why: rxrpc_rtt_tx_no_slot, slot: rtt_slot, send_serial: serial); |
173 | } |
174 | |
175 | /* |
176 | * Transmit an ACK packet. |
177 | */ |
178 | static void rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb) |
179 | { |
180 | struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base; |
181 | struct rxrpc_connection *conn; |
182 | struct rxrpc_ackpacket *ack = (struct rxrpc_ackpacket *)(whdr + 1); |
183 | struct msghdr msg; |
184 | ktime_t now; |
185 | int ret; |
186 | |
187 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
188 | return; |
189 | |
190 | conn = call->conn; |
191 | |
192 | msg.msg_name = &call->peer->srx.transport; |
193 | msg.msg_namelen = call->peer->srx.transport_len; |
194 | msg.msg_control = NULL; |
195 | msg.msg_controllen = 0; |
196 | msg.msg_flags = MSG_SPLICE_PAGES; |
197 | |
198 | whdr->flags = txb->flags & RXRPC_TXBUF_WIRE_FLAGS; |
199 | |
200 | txb->serial = rxrpc_get_next_serial(conn); |
201 | whdr->serial = htonl(txb->serial); |
202 | trace_rxrpc_tx_ack(call: call->debug_id, serial: txb->serial, |
203 | ntohl(ack->firstPacket), |
204 | ntohl(ack->serial), reason: ack->reason, n_acks: ack->nAcks, |
205 | rwind: txb->ack_rwind); |
206 | |
207 | rxrpc_inc_stat(call->rxnet, stat_tx_ack_send); |
208 | |
209 | iov_iter_kvec(i: &msg.msg_iter, WRITE, kvec: txb->kvec, nr_segs: txb->nr_kvec, count: txb->len); |
210 | rxrpc_local_dont_fragment(local: conn->local, set: false); |
211 | ret = do_udp_sendmsg(socket: conn->local->socket, msg: &msg, len: txb->len); |
212 | call->peer->last_tx_at = ktime_get_seconds(); |
213 | if (ret < 0) { |
214 | trace_rxrpc_tx_fail(debug_id: call->debug_id, serial: txb->serial, ret, |
215 | where: rxrpc_tx_point_call_ack); |
216 | } else { |
217 | trace_rxrpc_tx_packet(call_id: call->debug_id, whdr, |
218 | where: rxrpc_tx_point_call_ack); |
219 | now = ktime_get_real(); |
220 | if (ack->reason == RXRPC_ACK_PING) |
221 | rxrpc_begin_rtt_probe(call, serial: txb->serial, now, why: rxrpc_rtt_tx_ping); |
222 | if (txb->flags & RXRPC_REQUEST_ACK) |
223 | call->peer->rtt_last_req = now; |
224 | rxrpc_set_keepalive(call, now); |
225 | } |
226 | rxrpc_tx_backoff(call, ret); |
227 | } |
228 | |
229 | /* |
230 | * Queue an ACK for immediate transmission. |
231 | */ |
232 | void rxrpc_send_ACK(struct rxrpc_call *call, u8 ack_reason, |
233 | rxrpc_serial_t serial, enum rxrpc_propose_ack_trace why) |
234 | { |
235 | struct rxrpc_txbuf *txb; |
236 | |
237 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
238 | return; |
239 | |
240 | rxrpc_inc_stat(call->rxnet, stat_tx_acks[ack_reason]); |
241 | |
242 | txb = rxrpc_alloc_ack_txbuf(call, sack_size: call->ackr_wtop - call->ackr_window); |
243 | if (!txb) { |
244 | kleave(" = -ENOMEM" ); |
245 | return; |
246 | } |
247 | |
248 | txb->ack_why = why; |
249 | |
250 | rxrpc_fill_out_ack(call, txb, ack_reason, serial); |
251 | call->ackr_nr_unacked = 0; |
252 | atomic_set(v: &call->ackr_nr_consumed, i: 0); |
253 | clear_bit(nr: RXRPC_CALL_RX_IS_IDLE, addr: &call->flags); |
254 | |
255 | trace_rxrpc_send_ack(call, why, ack_reason, serial); |
256 | rxrpc_send_ack_packet(call, txb); |
257 | rxrpc_put_txbuf(txb, what: rxrpc_txbuf_put_ack_tx); |
258 | } |
259 | |
260 | /* |
261 | * Send an ABORT call packet. |
262 | */ |
263 | int rxrpc_send_abort_packet(struct rxrpc_call *call) |
264 | { |
265 | struct rxrpc_connection *conn; |
266 | struct rxrpc_abort_buffer pkt; |
267 | struct msghdr msg; |
268 | struct kvec iov[1]; |
269 | rxrpc_serial_t serial; |
270 | int ret; |
271 | |
272 | /* Don't bother sending aborts for a client call once the server has |
273 | * hard-ACK'd all of its request data. After that point, we're not |
274 | * going to stop the operation proceeding, and whilst we might limit |
275 | * the reply, it's not worth it if we can send a new call on the same |
276 | * channel instead, thereby closing off this call. |
277 | */ |
278 | if (rxrpc_is_client_call(call) && |
279 | test_bit(RXRPC_CALL_TX_ALL_ACKED, &call->flags)) |
280 | return 0; |
281 | |
282 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
283 | return -ECONNRESET; |
284 | |
285 | conn = call->conn; |
286 | |
287 | msg.msg_name = &call->peer->srx.transport; |
288 | msg.msg_namelen = call->peer->srx.transport_len; |
289 | msg.msg_control = NULL; |
290 | msg.msg_controllen = 0; |
291 | msg.msg_flags = 0; |
292 | |
293 | pkt.whdr.epoch = htonl(conn->proto.epoch); |
294 | pkt.whdr.cid = htonl(call->cid); |
295 | pkt.whdr.callNumber = htonl(call->call_id); |
296 | pkt.whdr.seq = 0; |
297 | pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; |
298 | pkt.whdr.flags = conn->out_clientflag; |
299 | pkt.whdr.userStatus = 0; |
300 | pkt.whdr.securityIndex = call->security_ix; |
301 | pkt.whdr._rsvd = 0; |
302 | pkt.whdr.serviceId = htons(call->dest_srx.srx_service); |
303 | pkt.abort_code = htonl(call->abort_code); |
304 | |
305 | iov[0].iov_base = &pkt; |
306 | iov[0].iov_len = sizeof(pkt); |
307 | |
308 | serial = rxrpc_get_next_serial(conn); |
309 | pkt.whdr.serial = htonl(serial); |
310 | |
311 | iov_iter_kvec(i: &msg.msg_iter, WRITE, kvec: iov, nr_segs: 1, count: sizeof(pkt)); |
312 | ret = do_udp_sendmsg(socket: conn->local->socket, msg: &msg, len: sizeof(pkt)); |
313 | conn->peer->last_tx_at = ktime_get_seconds(); |
314 | if (ret < 0) |
315 | trace_rxrpc_tx_fail(debug_id: call->debug_id, serial, ret, |
316 | where: rxrpc_tx_point_call_abort); |
317 | else |
318 | trace_rxrpc_tx_packet(call_id: call->debug_id, whdr: &pkt.whdr, |
319 | where: rxrpc_tx_point_call_abort); |
320 | rxrpc_tx_backoff(call, ret); |
321 | return ret; |
322 | } |
323 | |
324 | /* |
325 | * Prepare a (sub)packet for transmission. |
326 | */ |
327 | static void rxrpc_prepare_data_subpacket(struct rxrpc_call *call, struct rxrpc_txbuf *txb, |
328 | rxrpc_serial_t serial) |
329 | { |
330 | struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base; |
331 | enum rxrpc_req_ack_trace why; |
332 | struct rxrpc_connection *conn = call->conn; |
333 | |
334 | _enter("%x,{%d}" , txb->seq, txb->len); |
335 | |
336 | txb->serial = serial; |
337 | |
338 | if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && |
339 | txb->seq == 1) |
340 | whdr->userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; |
341 | |
342 | /* If our RTT cache needs working on, request an ACK. Also request |
343 | * ACKs if a DATA packet appears to have been lost. |
344 | * |
345 | * However, we mustn't request an ACK on the last reply packet of a |
346 | * service call, lest OpenAFS incorrectly send us an ACK with some |
347 | * soft-ACKs in it and then never follow up with a proper hard ACK. |
348 | */ |
349 | if (txb->flags & RXRPC_REQUEST_ACK) |
350 | why = rxrpc_reqack_already_on; |
351 | else if ((txb->flags & RXRPC_LAST_PACKET) && rxrpc_sending_to_client(txb)) |
352 | why = rxrpc_reqack_no_srv_last; |
353 | else if (test_and_clear_bit(nr: RXRPC_CALL_EV_ACK_LOST, addr: &call->events)) |
354 | why = rxrpc_reqack_ack_lost; |
355 | else if (txb->flags & RXRPC_TXBUF_RESENT) |
356 | why = rxrpc_reqack_retrans; |
357 | else if (call->cong_mode == RXRPC_CALL_SLOW_START && call->cong_cwnd <= 2) |
358 | why = rxrpc_reqack_slow_start; |
359 | else if (call->tx_winsize <= 2) |
360 | why = rxrpc_reqack_small_txwin; |
361 | else if (call->peer->rtt_count < 3 && txb->seq & 1) |
362 | why = rxrpc_reqack_more_rtt; |
363 | else if (ktime_before(cmp1: ktime_add_ms(kt: call->peer->rtt_last_req, msec: 1000), cmp2: ktime_get_real())) |
364 | why = rxrpc_reqack_old_rtt; |
365 | else |
366 | goto dont_set_request_ack; |
367 | |
368 | rxrpc_inc_stat(call->rxnet, stat_why_req_ack[why]); |
369 | trace_rxrpc_req_ack(call_debug_id: call->debug_id, seq: txb->seq, why); |
370 | if (why != rxrpc_reqack_no_srv_last) |
371 | txb->flags |= RXRPC_REQUEST_ACK; |
372 | dont_set_request_ack: |
373 | |
374 | whdr->flags = txb->flags & RXRPC_TXBUF_WIRE_FLAGS; |
375 | whdr->serial = htonl(txb->serial); |
376 | whdr->cksum = txb->cksum; |
377 | |
378 | trace_rxrpc_tx_data(call, seq: txb->seq, serial: txb->serial, flags: txb->flags, lose: false); |
379 | } |
380 | |
381 | /* |
382 | * Prepare a packet for transmission. |
383 | */ |
384 | static size_t rxrpc_prepare_data_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb) |
385 | { |
386 | rxrpc_serial_t serial; |
387 | |
388 | /* Each transmission of a Tx packet needs a new serial number */ |
389 | serial = rxrpc_get_next_serial(conn: call->conn); |
390 | |
391 | rxrpc_prepare_data_subpacket(call, txb, serial); |
392 | |
393 | return txb->len; |
394 | } |
395 | |
396 | /* |
397 | * Set timeouts after transmitting a packet. |
398 | */ |
399 | static void rxrpc_tstamp_data_packets(struct rxrpc_call *call, struct rxrpc_txbuf *txb) |
400 | { |
401 | ktime_t now = ktime_get_real(); |
402 | bool ack_requested = txb->flags & RXRPC_REQUEST_ACK; |
403 | |
404 | call->tx_last_sent = now; |
405 | txb->last_sent = now; |
406 | |
407 | if (ack_requested) { |
408 | rxrpc_begin_rtt_probe(call, serial: txb->serial, now, why: rxrpc_rtt_tx_data); |
409 | |
410 | call->peer->rtt_last_req = now; |
411 | if (call->peer->rtt_count > 1) { |
412 | ktime_t delay = rxrpc_get_rto_backoff(peer: call->peer, retrans: false); |
413 | |
414 | call->ack_lost_at = ktime_add(now, delay); |
415 | trace_rxrpc_timer_set(call, delay, why: rxrpc_timer_trace_lost_ack); |
416 | } |
417 | } |
418 | |
419 | if (!test_and_set_bit(nr: RXRPC_CALL_BEGAN_RX_TIMER, addr: &call->flags)) { |
420 | ktime_t delay = ms_to_ktime(READ_ONCE(call->next_rx_timo)); |
421 | |
422 | call->expect_rx_by = ktime_add(now, delay); |
423 | trace_rxrpc_timer_set(call, delay, why: rxrpc_timer_trace_expect_rx); |
424 | } |
425 | |
426 | rxrpc_set_keepalive(call, now); |
427 | } |
428 | |
429 | /* |
430 | * send a packet through the transport endpoint |
431 | */ |
432 | static int rxrpc_send_data_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb) |
433 | { |
434 | struct rxrpc_wire_header *whdr = txb->kvec[0].iov_base; |
435 | struct rxrpc_connection *conn = call->conn; |
436 | enum rxrpc_tx_point frag; |
437 | struct msghdr msg; |
438 | size_t len; |
439 | int ret; |
440 | |
441 | _enter("%x,{%d}" , txb->seq, txb->len); |
442 | |
443 | len = rxrpc_prepare_data_packet(call, txb); |
444 | |
445 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
446 | static int lose; |
447 | if ((lose++ & 7) == 7) { |
448 | ret = 0; |
449 | trace_rxrpc_tx_data(call, seq: txb->seq, serial: txb->serial, |
450 | flags: txb->flags, lose: true); |
451 | goto done; |
452 | } |
453 | } |
454 | |
455 | iov_iter_kvec(i: &msg.msg_iter, WRITE, kvec: txb->kvec, nr_segs: txb->nr_kvec, count: len); |
456 | |
457 | msg.msg_name = &call->peer->srx.transport; |
458 | msg.msg_namelen = call->peer->srx.transport_len; |
459 | msg.msg_control = NULL; |
460 | msg.msg_controllen = 0; |
461 | msg.msg_flags = MSG_SPLICE_PAGES; |
462 | |
463 | /* Track what we've attempted to transmit at least once so that the |
464 | * retransmission algorithm doesn't try to resend what we haven't sent |
465 | * yet. |
466 | */ |
467 | if (txb->seq == call->tx_transmitted + 1) |
468 | call->tx_transmitted = txb->seq; |
469 | |
470 | /* send the packet with the don't fragment bit set if we currently |
471 | * think it's small enough */ |
472 | if (txb->len >= call->peer->maxdata) { |
473 | rxrpc_local_dont_fragment(local: conn->local, set: false); |
474 | frag = rxrpc_tx_point_call_data_frag; |
475 | } else { |
476 | rxrpc_local_dont_fragment(local: conn->local, set: true); |
477 | frag = rxrpc_tx_point_call_data_nofrag; |
478 | } |
479 | |
480 | retry: |
481 | /* send the packet by UDP |
482 | * - returns -EMSGSIZE if UDP would have to fragment the packet |
483 | * to go out of the interface |
484 | * - in which case, we'll have processed the ICMP error |
485 | * message and update the peer record |
486 | */ |
487 | rxrpc_inc_stat(call->rxnet, stat_tx_data_send); |
488 | ret = do_udp_sendmsg(socket: conn->local->socket, msg: &msg, len); |
489 | conn->peer->last_tx_at = ktime_get_seconds(); |
490 | |
491 | if (ret < 0) { |
492 | rxrpc_inc_stat(call->rxnet, stat_tx_data_send_fail); |
493 | trace_rxrpc_tx_fail(debug_id: call->debug_id, serial: txb->serial, ret, where: frag); |
494 | } else { |
495 | trace_rxrpc_tx_packet(call_id: call->debug_id, whdr, where: frag); |
496 | } |
497 | |
498 | rxrpc_tx_backoff(call, ret); |
499 | if (ret == -EMSGSIZE && frag == rxrpc_tx_point_call_data_frag) { |
500 | rxrpc_local_dont_fragment(local: conn->local, set: false); |
501 | frag = rxrpc_tx_point_call_data_frag; |
502 | goto retry; |
503 | } |
504 | |
505 | done: |
506 | if (ret >= 0) { |
507 | rxrpc_tstamp_data_packets(call, txb); |
508 | } else { |
509 | /* Cancel the call if the initial transmission fails, |
510 | * particularly if that's due to network routing issues that |
511 | * aren't going away anytime soon. The layer above can arrange |
512 | * the retransmission. |
513 | */ |
514 | if (!test_and_set_bit(nr: RXRPC_CALL_BEGAN_RX_TIMER, addr: &call->flags)) |
515 | rxrpc_set_call_completion(call, compl: RXRPC_CALL_LOCAL_ERROR, |
516 | RX_USER_ABORT, error: ret); |
517 | } |
518 | |
519 | _leave(" = %d [%u]" , ret, call->peer->maxdata); |
520 | return ret; |
521 | } |
522 | |
523 | /* |
524 | * Transmit a connection-level abort. |
525 | */ |
526 | void rxrpc_send_conn_abort(struct rxrpc_connection *conn) |
527 | { |
528 | struct rxrpc_wire_header whdr; |
529 | struct msghdr msg; |
530 | struct kvec iov[2]; |
531 | __be32 word; |
532 | size_t len; |
533 | u32 serial; |
534 | int ret; |
535 | |
536 | msg.msg_name = &conn->peer->srx.transport; |
537 | msg.msg_namelen = conn->peer->srx.transport_len; |
538 | msg.msg_control = NULL; |
539 | msg.msg_controllen = 0; |
540 | msg.msg_flags = 0; |
541 | |
542 | whdr.epoch = htonl(conn->proto.epoch); |
543 | whdr.cid = htonl(conn->proto.cid); |
544 | whdr.callNumber = 0; |
545 | whdr.seq = 0; |
546 | whdr.type = RXRPC_PACKET_TYPE_ABORT; |
547 | whdr.flags = conn->out_clientflag; |
548 | whdr.userStatus = 0; |
549 | whdr.securityIndex = conn->security_ix; |
550 | whdr._rsvd = 0; |
551 | whdr.serviceId = htons(conn->service_id); |
552 | |
553 | word = htonl(conn->abort_code); |
554 | |
555 | iov[0].iov_base = &whdr; |
556 | iov[0].iov_len = sizeof(whdr); |
557 | iov[1].iov_base = &word; |
558 | iov[1].iov_len = sizeof(word); |
559 | |
560 | len = iov[0].iov_len + iov[1].iov_len; |
561 | |
562 | serial = rxrpc_get_next_serial(conn); |
563 | whdr.serial = htonl(serial); |
564 | |
565 | iov_iter_kvec(i: &msg.msg_iter, WRITE, kvec: iov, nr_segs: 2, count: len); |
566 | ret = do_udp_sendmsg(socket: conn->local->socket, msg: &msg, len); |
567 | if (ret < 0) { |
568 | trace_rxrpc_tx_fail(debug_id: conn->debug_id, serial, ret, |
569 | where: rxrpc_tx_point_conn_abort); |
570 | _debug("sendmsg failed: %d" , ret); |
571 | return; |
572 | } |
573 | |
574 | trace_rxrpc_tx_packet(call_id: conn->debug_id, whdr: &whdr, where: rxrpc_tx_point_conn_abort); |
575 | |
576 | conn->peer->last_tx_at = ktime_get_seconds(); |
577 | } |
578 | |
579 | /* |
580 | * Reject a packet through the local endpoint. |
581 | */ |
582 | void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) |
583 | { |
584 | struct rxrpc_wire_header whdr; |
585 | struct sockaddr_rxrpc srx; |
586 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
587 | struct msghdr msg; |
588 | struct kvec iov[2]; |
589 | size_t size; |
590 | __be32 code; |
591 | int ret, ioc; |
592 | |
593 | rxrpc_see_skb(skb, rxrpc_skb_see_reject); |
594 | |
595 | iov[0].iov_base = &whdr; |
596 | iov[0].iov_len = sizeof(whdr); |
597 | iov[1].iov_base = &code; |
598 | iov[1].iov_len = sizeof(code); |
599 | |
600 | msg.msg_name = &srx.transport; |
601 | msg.msg_control = NULL; |
602 | msg.msg_controllen = 0; |
603 | msg.msg_flags = 0; |
604 | |
605 | memset(&whdr, 0, sizeof(whdr)); |
606 | |
607 | switch (skb->mark) { |
608 | case RXRPC_SKB_MARK_REJECT_BUSY: |
609 | whdr.type = RXRPC_PACKET_TYPE_BUSY; |
610 | size = sizeof(whdr); |
611 | ioc = 1; |
612 | break; |
613 | case RXRPC_SKB_MARK_REJECT_ABORT: |
614 | whdr.type = RXRPC_PACKET_TYPE_ABORT; |
615 | code = htonl(skb->priority); |
616 | size = sizeof(whdr) + sizeof(code); |
617 | ioc = 2; |
618 | break; |
619 | default: |
620 | return; |
621 | } |
622 | |
623 | if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) { |
624 | msg.msg_namelen = srx.transport_len; |
625 | |
626 | whdr.epoch = htonl(sp->hdr.epoch); |
627 | whdr.cid = htonl(sp->hdr.cid); |
628 | whdr.callNumber = htonl(sp->hdr.callNumber); |
629 | whdr.serviceId = htons(sp->hdr.serviceId); |
630 | whdr.flags = sp->hdr.flags; |
631 | whdr.flags ^= RXRPC_CLIENT_INITIATED; |
632 | whdr.flags &= RXRPC_CLIENT_INITIATED; |
633 | |
634 | iov_iter_kvec(i: &msg.msg_iter, WRITE, kvec: iov, nr_segs: ioc, count: size); |
635 | ret = do_udp_sendmsg(socket: local->socket, msg: &msg, len: size); |
636 | if (ret < 0) |
637 | trace_rxrpc_tx_fail(debug_id: local->debug_id, serial: 0, ret, |
638 | where: rxrpc_tx_point_reject); |
639 | else |
640 | trace_rxrpc_tx_packet(call_id: local->debug_id, whdr: &whdr, |
641 | where: rxrpc_tx_point_reject); |
642 | } |
643 | } |
644 | |
645 | /* |
646 | * Send a VERSION reply to a peer as a keepalive. |
647 | */ |
648 | void rxrpc_send_keepalive(struct rxrpc_peer *peer) |
649 | { |
650 | struct rxrpc_wire_header whdr; |
651 | struct msghdr msg; |
652 | struct kvec iov[2]; |
653 | size_t len; |
654 | int ret; |
655 | |
656 | _enter("" ); |
657 | |
658 | msg.msg_name = &peer->srx.transport; |
659 | msg.msg_namelen = peer->srx.transport_len; |
660 | msg.msg_control = NULL; |
661 | msg.msg_controllen = 0; |
662 | msg.msg_flags = 0; |
663 | |
664 | whdr.epoch = htonl(peer->local->rxnet->epoch); |
665 | whdr.cid = 0; |
666 | whdr.callNumber = 0; |
667 | whdr.seq = 0; |
668 | whdr.serial = 0; |
669 | whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ |
670 | whdr.flags = RXRPC_LAST_PACKET; |
671 | whdr.userStatus = 0; |
672 | whdr.securityIndex = 0; |
673 | whdr._rsvd = 0; |
674 | whdr.serviceId = 0; |
675 | |
676 | iov[0].iov_base = &whdr; |
677 | iov[0].iov_len = sizeof(whdr); |
678 | iov[1].iov_base = (char *)rxrpc_keepalive_string; |
679 | iov[1].iov_len = sizeof(rxrpc_keepalive_string); |
680 | |
681 | len = iov[0].iov_len + iov[1].iov_len; |
682 | |
683 | iov_iter_kvec(i: &msg.msg_iter, WRITE, kvec: iov, nr_segs: 2, count: len); |
684 | ret = do_udp_sendmsg(socket: peer->local->socket, msg: &msg, len); |
685 | if (ret < 0) |
686 | trace_rxrpc_tx_fail(debug_id: peer->debug_id, serial: 0, ret, |
687 | where: rxrpc_tx_point_version_keepalive); |
688 | else |
689 | trace_rxrpc_tx_packet(call_id: peer->debug_id, whdr: &whdr, |
690 | where: rxrpc_tx_point_version_keepalive); |
691 | |
692 | peer->last_tx_at = ktime_get_seconds(); |
693 | _leave("" ); |
694 | } |
695 | |
696 | /* |
697 | * Schedule an instant Tx resend. |
698 | */ |
699 | static inline void rxrpc_instant_resend(struct rxrpc_call *call, |
700 | struct rxrpc_txbuf *txb) |
701 | { |
702 | if (!__rxrpc_call_is_complete(call)) |
703 | kdebug("resend" ); |
704 | } |
705 | |
706 | /* |
707 | * Transmit one packet. |
708 | */ |
709 | void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb) |
710 | { |
711 | int ret; |
712 | |
713 | ret = rxrpc_send_data_packet(call, txb); |
714 | if (ret < 0) { |
715 | switch (ret) { |
716 | case -ENETUNREACH: |
717 | case -EHOSTUNREACH: |
718 | case -ECONNREFUSED: |
719 | rxrpc_set_call_completion(call, compl: RXRPC_CALL_LOCAL_ERROR, |
720 | abort_code: 0, error: ret); |
721 | break; |
722 | default: |
723 | _debug("need instant resend %d" , ret); |
724 | rxrpc_instant_resend(call, txb); |
725 | } |
726 | } else { |
727 | ktime_t delay = ns_to_ktime(ns: call->peer->rto_us * NSEC_PER_USEC); |
728 | |
729 | call->resend_at = ktime_add(ktime_get_real(), delay); |
730 | trace_rxrpc_timer_set(call, delay, why: rxrpc_timer_trace_resend_tx); |
731 | } |
732 | } |
733 | |