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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; |
9a3dedcf | 77 | unsigned int tmp; |
248f219c DH |
78 | rxrpc_seq_t hard_ack, top, seq; |
79 | int ix; | |
8d94aa38 DH |
80 | u32 mtu, jmax; |
81 | u8 *ackp = pkt->acks; | |
82 | ||
9a3dedcf DH |
83 | tmp = atomic_xchg(&call->ackr_nr_unacked, 0); |
84 | tmp |= atomic_xchg(&call->ackr_nr_consumed, 0); | |
85 | if (!tmp && (reason == RXRPC_ACK_DELAY || | |
86 | reason == RXRPC_ACK_IDLE)) | |
87 | return 0; | |
88 | ||
248f219c | 89 | /* Barrier against rxrpc_input_data(). */ |
f3639df2 | 90 | serial = call->ackr_serial; |
248f219c DH |
91 | hard_ack = READ_ONCE(call->rx_hard_ack); |
92 | top = smp_load_acquire(&call->rx_top); | |
805b21b9 DH |
93 | *_hard_ack = hard_ack; |
94 | *_top = top; | |
248f219c | 95 | |
8d94aa38 | 96 | pkt->ack.bufferSpace = htons(8); |
e8c3af6b | 97 | pkt->ack.maxSkew = htons(0); |
248f219c | 98 | pkt->ack.firstPacket = htonl(hard_ack + 1); |
81524b63 | 99 | pkt->ack.previousPacket = htonl(call->ackr_highest_seq); |
f3639df2 | 100 | pkt->ack.serial = htonl(serial); |
a5af7e1f | 101 | pkt->ack.reason = reason; |
248f219c DH |
102 | pkt->ack.nAcks = top - hard_ack; |
103 | ||
a5af7e1f | 104 | if (reason == RXRPC_ACK_PING) |
8e83134d DH |
105 | pkt->whdr.flags |= RXRPC_REQUEST_ACK; |
106 | ||
248f219c DH |
107 | if (after(top, hard_ack)) { |
108 | seq = hard_ack + 1; | |
109 | do { | |
110 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
111 | if (call->rxtx_buffer[ix]) | |
112 | *ackp++ = RXRPC_ACK_TYPE_ACK; | |
113 | else | |
114 | *ackp++ = RXRPC_ACK_TYPE_NACK; | |
115 | seq++; | |
116 | } while (before_eq(seq, top)); | |
117 | } | |
8d94aa38 | 118 | |
1457cc4c DH |
119 | mtu = conn->params.peer->if_mtu; |
120 | mtu -= conn->params.peer->hdrsize; | |
75e42126 | 121 | jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max; |
8d94aa38 DH |
122 | pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
123 | pkt->ackinfo.maxMTU = htonl(mtu); | |
75e42126 | 124 | pkt->ackinfo.rwind = htonl(call->rx_winsize); |
8d94aa38 DH |
125 | pkt->ackinfo.jumbo_max = htonl(jmax); |
126 | ||
127 | *ackp++ = 0; | |
128 | *ackp++ = 0; | |
129 | *ackp++ = 0; | |
248f219c | 130 | return top - hard_ack + 3; |
8d94aa38 DH |
131 | } |
132 | ||
4700c4d8 DH |
133 | /* |
134 | * Record the beginning of an RTT probe. | |
135 | */ | |
136 | static int rxrpc_begin_rtt_probe(struct rxrpc_call *call, rxrpc_serial_t serial, | |
137 | enum rxrpc_rtt_tx_trace why) | |
138 | { | |
139 | unsigned long avail = call->rtt_avail; | |
140 | int rtt_slot = 9; | |
141 | ||
142 | if (!(avail & RXRPC_CALL_RTT_AVAIL_MASK)) | |
143 | goto no_slot; | |
144 | ||
145 | rtt_slot = __ffs(avail & RXRPC_CALL_RTT_AVAIL_MASK); | |
146 | if (!test_and_clear_bit(rtt_slot, &call->rtt_avail)) | |
147 | goto no_slot; | |
148 | ||
149 | call->rtt_serial[rtt_slot] = serial; | |
150 | call->rtt_sent_at[rtt_slot] = ktime_get_real(); | |
151 | smp_wmb(); /* Write data before avail bit */ | |
152 | set_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail); | |
153 | ||
154 | trace_rxrpc_rtt_tx(call, why, rtt_slot, serial); | |
155 | return rtt_slot; | |
156 | ||
157 | no_slot: | |
158 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_no_slot, rtt_slot, serial); | |
159 | return -1; | |
160 | } | |
161 | ||
162 | /* | |
163 | * Cancel an RTT probe. | |
164 | */ | |
165 | static void rxrpc_cancel_rtt_probe(struct rxrpc_call *call, | |
166 | rxrpc_serial_t serial, int rtt_slot) | |
167 | { | |
168 | if (rtt_slot != -1) { | |
169 | clear_bit(rtt_slot + RXRPC_CALL_RTT_PEND_SHIFT, &call->rtt_avail); | |
170 | smp_wmb(); /* Clear pending bit before setting slot */ | |
171 | set_bit(rtt_slot, &call->rtt_avail); | |
172 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_cancel, rtt_slot, serial); | |
173 | } | |
174 | } | |
175 | ||
8d94aa38 | 176 | /* |
26cb02aa | 177 | * Send an ACK call packet. |
8d94aa38 | 178 | */ |
bd1fdf8c DH |
179 | int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping, |
180 | rxrpc_serial_t *_serial) | |
8d94aa38 | 181 | { |
5273a191 | 182 | struct rxrpc_connection *conn; |
26cb02aa | 183 | struct rxrpc_ack_buffer *pkt; |
8d94aa38 DH |
184 | struct msghdr msg; |
185 | struct kvec iov[2]; | |
186 | rxrpc_serial_t serial; | |
805b21b9 | 187 | rxrpc_seq_t hard_ack, top; |
8d94aa38 | 188 | size_t len, n; |
4700c4d8 | 189 | int ret, rtt_slot = -1; |
a5af7e1f | 190 | u8 reason; |
8d94aa38 | 191 | |
5273a191 | 192 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
8d94aa38 DH |
193 | return -ECONNRESET; |
194 | ||
195 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
5273a191 | 196 | if (!pkt) |
8d94aa38 | 197 | return -ENOMEM; |
5273a191 DH |
198 | |
199 | conn = call->conn; | |
8d94aa38 | 200 | |
8d94aa38 DH |
201 | msg.msg_name = &call->peer->srx.transport; |
202 | msg.msg_namelen = call->peer->srx.transport_len; | |
203 | msg.msg_control = NULL; | |
204 | msg.msg_controllen = 0; | |
205 | msg.msg_flags = 0; | |
206 | ||
207 | pkt->whdr.epoch = htonl(conn->proto.epoch); | |
208 | pkt->whdr.cid = htonl(call->cid); | |
209 | pkt->whdr.callNumber = htonl(call->call_id); | |
210 | pkt->whdr.seq = 0; | |
26cb02aa DH |
211 | pkt->whdr.type = RXRPC_PACKET_TYPE_ACK; |
212 | pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag; | |
8d94aa38 DH |
213 | pkt->whdr.userStatus = 0; |
214 | pkt->whdr.securityIndex = call->security_ix; | |
215 | pkt->whdr._rsvd = 0; | |
216 | pkt->whdr.serviceId = htons(call->service_id); | |
217 | ||
26cb02aa | 218 | spin_lock_bh(&call->lock); |
a5af7e1f DH |
219 | if (ping) { |
220 | reason = RXRPC_ACK_PING; | |
221 | } else { | |
222 | reason = call->ackr_reason; | |
223 | if (!call->ackr_reason) { | |
224 | spin_unlock_bh(&call->lock); | |
225 | ret = 0; | |
226 | goto out; | |
227 | } | |
228 | call->ackr_reason = 0; | |
8d94aa38 | 229 | } |
1457cc4c | 230 | n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason); |
26cb02aa DH |
231 | |
232 | spin_unlock_bh(&call->lock); | |
9a3dedcf DH |
233 | if (n == 0) { |
234 | kfree(pkt); | |
235 | return 0; | |
236 | } | |
26cb02aa DH |
237 | |
238 | iov[0].iov_base = pkt; | |
239 | iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n; | |
240 | iov[1].iov_base = &pkt->ackinfo; | |
241 | iov[1].iov_len = sizeof(pkt->ackinfo); | |
242 | len = iov[0].iov_len + iov[1].iov_len; | |
8d94aa38 | 243 | |
b86e218e DH |
244 | serial = atomic_inc_return(&conn->serial); |
245 | pkt->whdr.serial = htonl(serial); | |
4764c0da | 246 | trace_rxrpc_tx_ack(call->debug_id, serial, |
26cb02aa DH |
247 | ntohl(pkt->ack.firstPacket), |
248 | ntohl(pkt->ack.serial), | |
249 | pkt->ack.reason, pkt->ack.nAcks); | |
bd1fdf8c DH |
250 | if (_serial) |
251 | *_serial = serial; | |
b86e218e | 252 | |
4700c4d8 DH |
253 | if (ping) |
254 | rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_ping); | |
26cb02aa DH |
255 | |
256 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
330bdcfa | 257 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
6b47fe1d DH |
258 | if (ret < 0) |
259 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
4764c0da DH |
260 | rxrpc_tx_point_call_ack); |
261 | else | |
262 | trace_rxrpc_tx_packet(call->debug_id, &pkt->whdr, | |
263 | rxrpc_tx_point_call_ack); | |
c7e86acf | 264 | rxrpc_tx_backoff(call, ret); |
8d94aa38 | 265 | |
26cb02aa | 266 | if (call->state < RXRPC_CALL_COMPLETE) { |
805b21b9 | 267 | if (ret < 0) { |
4700c4d8 | 268 | rxrpc_cancel_rtt_probe(call, serial, rtt_slot); |
248f219c | 269 | rxrpc_propose_ACK(call, pkt->ack.reason, |
248f219c | 270 | ntohl(pkt->ack.serial), |
c7e86acf | 271 | false, true, |
9c7ad434 | 272 | rxrpc_propose_ack_retry_tx); |
248f219c | 273 | } |
415f44e4 DH |
274 | |
275 | rxrpc_set_keepalive(call); | |
248f219c DH |
276 | } |
277 | ||
8d94aa38 | 278 | out: |
8d94aa38 DH |
279 | kfree(pkt); |
280 | return ret; | |
281 | } | |
282 | ||
26cb02aa DH |
283 | /* |
284 | * Send an ABORT call packet. | |
285 | */ | |
286 | int rxrpc_send_abort_packet(struct rxrpc_call *call) | |
287 | { | |
5273a191 | 288 | struct rxrpc_connection *conn; |
26cb02aa DH |
289 | struct rxrpc_abort_buffer pkt; |
290 | struct msghdr msg; | |
291 | struct kvec iov[1]; | |
292 | rxrpc_serial_t serial; | |
293 | int ret; | |
294 | ||
dcbefc30 DH |
295 | /* Don't bother sending aborts for a client call once the server has |
296 | * hard-ACK'd all of its request data. After that point, we're not | |
297 | * going to stop the operation proceeding, and whilst we might limit | |
298 | * the reply, it's not worth it if we can send a new call on the same | |
299 | * channel instead, thereby closing off this call. | |
300 | */ | |
301 | if (rxrpc_is_client_call(call) && | |
302 | test_bit(RXRPC_CALL_TX_LAST, &call->flags)) | |
303 | return 0; | |
304 | ||
5273a191 | 305 | if (test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) |
26cb02aa DH |
306 | return -ECONNRESET; |
307 | ||
5273a191 DH |
308 | conn = call->conn; |
309 | ||
26cb02aa DH |
310 | msg.msg_name = &call->peer->srx.transport; |
311 | msg.msg_namelen = call->peer->srx.transport_len; | |
312 | msg.msg_control = NULL; | |
313 | msg.msg_controllen = 0; | |
314 | msg.msg_flags = 0; | |
315 | ||
316 | pkt.whdr.epoch = htonl(conn->proto.epoch); | |
317 | pkt.whdr.cid = htonl(call->cid); | |
318 | pkt.whdr.callNumber = htonl(call->call_id); | |
319 | pkt.whdr.seq = 0; | |
320 | pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
321 | pkt.whdr.flags = conn->out_clientflag; | |
322 | pkt.whdr.userStatus = 0; | |
323 | pkt.whdr.securityIndex = call->security_ix; | |
324 | pkt.whdr._rsvd = 0; | |
325 | pkt.whdr.serviceId = htons(call->service_id); | |
326 | pkt.abort_code = htonl(call->abort_code); | |
327 | ||
328 | iov[0].iov_base = &pkt; | |
329 | iov[0].iov_len = sizeof(pkt); | |
330 | ||
331 | serial = atomic_inc_return(&conn->serial); | |
332 | pkt.whdr.serial = htonl(serial); | |
333 | ||
334 | ret = kernel_sendmsg(conn->params.local->socket, | |
335 | &msg, iov, 1, sizeof(pkt)); | |
330bdcfa | 336 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
6b47fe1d DH |
337 | if (ret < 0) |
338 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
4764c0da DH |
339 | rxrpc_tx_point_call_abort); |
340 | else | |
341 | trace_rxrpc_tx_packet(call->debug_id, &pkt.whdr, | |
342 | rxrpc_tx_point_call_abort); | |
c7e86acf | 343 | rxrpc_tx_backoff(call, ret); |
26cb02aa DH |
344 | return ret; |
345 | } | |
346 | ||
17926a79 DH |
347 | /* |
348 | * send a packet through the transport endpoint | |
349 | */ | |
a1767077 DH |
350 | int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb, |
351 | bool retrans) | |
17926a79 | 352 | { |
5a924b89 DH |
353 | struct rxrpc_connection *conn = call->conn; |
354 | struct rxrpc_wire_header whdr; | |
355 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
17926a79 | 356 | struct msghdr msg; |
5a924b89 DH |
357 | struct kvec iov[2]; |
358 | rxrpc_serial_t serial; | |
359 | size_t len; | |
4700c4d8 | 360 | int ret, rtt_slot = -1; |
17926a79 DH |
361 | |
362 | _enter(",{%d}", skb->len); | |
363 | ||
245500d8 DH |
364 | if (hlist_unhashed(&call->error_link)) { |
365 | spin_lock_bh(&call->peer->lock); | |
366 | hlist_add_head_rcu(&call->error_link, &call->peer->error_targets); | |
367 | spin_unlock_bh(&call->peer->lock); | |
368 | } | |
369 | ||
5a924b89 DH |
370 | /* Each transmission of a Tx packet needs a new serial number */ |
371 | serial = atomic_inc_return(&conn->serial); | |
17926a79 | 372 | |
5a924b89 DH |
373 | whdr.epoch = htonl(conn->proto.epoch); |
374 | whdr.cid = htonl(call->cid); | |
375 | whdr.callNumber = htonl(call->call_id); | |
376 | whdr.seq = htonl(sp->hdr.seq); | |
377 | whdr.serial = htonl(serial); | |
378 | whdr.type = RXRPC_PACKET_TYPE_DATA; | |
379 | whdr.flags = sp->hdr.flags; | |
380 | whdr.userStatus = 0; | |
381 | whdr.securityIndex = call->security_ix; | |
382 | whdr._rsvd = htons(sp->hdr._rsvd); | |
383 | whdr.serviceId = htons(call->service_id); | |
384 | ||
4e255721 DH |
385 | if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && |
386 | sp->hdr.seq == 1) | |
387 | whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; | |
388 | ||
5a924b89 DH |
389 | iov[0].iov_base = &whdr; |
390 | iov[0].iov_len = sizeof(whdr); | |
391 | iov[1].iov_base = skb->head; | |
392 | iov[1].iov_len = skb->len; | |
393 | len = iov[0].iov_len + iov[1].iov_len; | |
394 | ||
395 | msg.msg_name = &call->peer->srx.transport; | |
396 | msg.msg_namelen = call->peer->srx.transport_len; | |
17926a79 DH |
397 | msg.msg_control = NULL; |
398 | msg.msg_controllen = 0; | |
399 | msg.msg_flags = 0; | |
400 | ||
57494343 DH |
401 | /* If our RTT cache needs working on, request an ACK. Also request |
402 | * ACKs if a DATA packet appears to have been lost. | |
b604dd98 DH |
403 | * |
404 | * However, we mustn't request an ACK on the last reply packet of a | |
405 | * service call, lest OpenAFS incorrectly send us an ACK with some | |
406 | * soft-ACKs in it and then never follow up with a proper hard ACK. | |
57494343 | 407 | */ |
b604dd98 DH |
408 | if ((!(sp->hdr.flags & RXRPC_LAST_PACKET) || |
409 | rxrpc_to_server(sp) | |
410 | ) && | |
bd1fdf8c DH |
411 | (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) || |
412 | retrans || | |
bf7d620a | 413 | call->cong_mode == RXRPC_CALL_SLOW_START || |
c410bf01 | 414 | (call->peer->rtt_count < 3 && sp->hdr.seq & 1) || |
bf7d620a DH |
415 | ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), |
416 | ktime_get_real()))) | |
0d4b103c DH |
417 | whdr.flags |= RXRPC_REQUEST_ACK; |
418 | ||
8a681c36 DH |
419 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
420 | static int lose; | |
421 | if ((lose++ & 7) == 7) { | |
a1767077 | 422 | ret = 0; |
526949e8 AB |
423 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, |
424 | whdr.flags, retrans, true); | |
425 | goto done; | |
8a681c36 DH |
426 | } |
427 | } | |
428 | ||
526949e8 AB |
429 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, retrans, |
430 | false); | |
5a924b89 | 431 | |
17926a79 DH |
432 | /* send the packet with the don't fragment bit set if we currently |
433 | * think it's small enough */ | |
5a924b89 DH |
434 | if (iov[1].iov_len >= call->peer->maxdata) |
435 | goto send_fragmentable; | |
436 | ||
437 | down_read(&conn->params.local->defrag_sem); | |
b604dd98 DH |
438 | |
439 | sp->hdr.serial = serial; | |
440 | smp_wmb(); /* Set serial before timestamp */ | |
441 | skb->tstamp = ktime_get_real(); | |
4700c4d8 DH |
442 | if (whdr.flags & RXRPC_REQUEST_ACK) |
443 | rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data); | |
b604dd98 | 444 | |
5a924b89 DH |
445 | /* send the packet by UDP |
446 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
447 | * to go out of the interface | |
448 | * - in which case, we'll have processed the ICMP error | |
449 | * message and update the peer record | |
450 | */ | |
451 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
330bdcfa | 452 | conn->params.peer->last_tx_at = ktime_get_seconds(); |
5a924b89 DH |
453 | |
454 | up_read(&conn->params.local->defrag_sem); | |
4700c4d8 DH |
455 | if (ret < 0) { |
456 | rxrpc_cancel_rtt_probe(call, serial, rtt_slot); | |
6b47fe1d | 457 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, |
4764c0da | 458 | rxrpc_tx_point_call_data_nofrag); |
4700c4d8 | 459 | } else { |
4764c0da DH |
460 | trace_rxrpc_tx_packet(call->debug_id, &whdr, |
461 | rxrpc_tx_point_call_data_nofrag); | |
4700c4d8 DH |
462 | } |
463 | ||
c7e86acf | 464 | rxrpc_tx_backoff(call, ret); |
5a924b89 DH |
465 | if (ret == -EMSGSIZE) |
466 | goto send_fragmentable; | |
467 | ||
468 | done: | |
50235c4b | 469 | if (ret >= 0) { |
0d4b103c | 470 | if (whdr.flags & RXRPC_REQUEST_ACK) { |
b604dd98 | 471 | call->peer->rtt_last_req = skb->tstamp; |
c410bf01 | 472 | if (call->peer->rtt_count > 1) { |
bd1fdf8c DH |
473 | unsigned long nowj = jiffies, ack_lost_at; |
474 | ||
2c13c05c | 475 | ack_lost_at = rxrpc_get_rto_backoff(call->peer, false); |
bd1fdf8c DH |
476 | ack_lost_at += nowj; |
477 | WRITE_ONCE(call->ack_lost_at, ack_lost_at); | |
478 | rxrpc_reduce_call_timer(call, ack_lost_at, nowj, | |
479 | rxrpc_timer_set_for_lost_ack); | |
480 | } | |
0d4b103c | 481 | } |
c54e43d7 DH |
482 | |
483 | if (sp->hdr.seq == 1 && | |
484 | !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, | |
485 | &call->flags)) { | |
486 | unsigned long nowj = jiffies, expect_rx_by; | |
487 | ||
488 | expect_rx_by = nowj + call->next_rx_timo; | |
489 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); | |
490 | rxrpc_reduce_call_timer(call, expect_rx_by, nowj, | |
491 | rxrpc_timer_set_for_normal); | |
492 | } | |
415f44e4 | 493 | |
c7e86acf DH |
494 | rxrpc_set_keepalive(call); |
495 | } else { | |
496 | /* Cancel the call if the initial transmission fails, | |
497 | * particularly if that's due to network routing issues that | |
498 | * aren't going away anytime soon. The layer above can arrange | |
499 | * the retransmission. | |
500 | */ | |
501 | if (!test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, &call->flags)) | |
502 | rxrpc_set_call_completion(call, RXRPC_CALL_LOCAL_ERROR, | |
503 | RX_USER_ABORT, ret); | |
504 | } | |
415f44e4 | 505 | |
5a924b89 DH |
506 | _leave(" = %d [%u]", ret, call->peer->maxdata); |
507 | return ret; | |
17926a79 DH |
508 | |
509 | send_fragmentable: | |
510 | /* attempt to send this message with fragmentation enabled */ | |
511 | _debug("send fragment"); | |
512 | ||
985a5c82 DH |
513 | down_write(&conn->params.local->defrag_sem); |
514 | ||
b604dd98 DH |
515 | sp->hdr.serial = serial; |
516 | smp_wmb(); /* Set serial before timestamp */ | |
517 | skb->tstamp = ktime_get_real(); | |
4700c4d8 DH |
518 | if (whdr.flags & RXRPC_REQUEST_ACK) |
519 | rtt_slot = rxrpc_begin_rtt_probe(call, serial, rxrpc_rtt_tx_data); | |
b604dd98 | 520 | |
985a5c82 | 521 | switch (conn->params.local->srx.transport.family) { |
0e631eee | 522 | case AF_INET6: |
985a5c82 | 523 | case AF_INET: |
2de569bd CH |
524 | ip_sock_set_mtu_discover(conn->params.local->socket->sk, |
525 | IP_PMTUDISC_DONT); | |
0e631eee DH |
526 | ret = kernel_sendmsg(conn->params.local->socket, &msg, |
527 | iov, 2, len); | |
528 | conn->params.peer->last_tx_at = ktime_get_seconds(); | |
529 | ||
2de569bd CH |
530 | ip_sock_set_mtu_discover(conn->params.local->socket->sk, |
531 | IP_PMTUDISC_DO); | |
75b54cb5 | 532 | break; |
3427beb6 DH |
533 | |
534 | default: | |
535 | BUG(); | |
17926a79 DH |
536 | } |
537 | ||
4700c4d8 DH |
538 | if (ret < 0) { |
539 | rxrpc_cancel_rtt_probe(call, serial, rtt_slot); | |
6b47fe1d | 540 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, |
4764c0da | 541 | rxrpc_tx_point_call_data_frag); |
4700c4d8 | 542 | } else { |
4764c0da DH |
543 | trace_rxrpc_tx_packet(call->debug_id, &whdr, |
544 | rxrpc_tx_point_call_data_frag); | |
4700c4d8 | 545 | } |
c7e86acf | 546 | rxrpc_tx_backoff(call, ret); |
6b47fe1d | 547 | |
985a5c82 | 548 | up_write(&conn->params.local->defrag_sem); |
5a924b89 | 549 | goto done; |
17926a79 | 550 | } |
248f219c DH |
551 | |
552 | /* | |
553 | * reject packets through the local endpoint | |
554 | */ | |
555 | void rxrpc_reject_packets(struct rxrpc_local *local) | |
556 | { | |
1c2bc7b9 | 557 | struct sockaddr_rxrpc srx; |
248f219c DH |
558 | struct rxrpc_skb_priv *sp; |
559 | struct rxrpc_wire_header whdr; | |
560 | struct sk_buff *skb; | |
561 | struct msghdr msg; | |
562 | struct kvec iov[2]; | |
563 | size_t size; | |
564 | __be32 code; | |
ece64fec | 565 | int ret, ioc; |
248f219c DH |
566 | |
567 | _enter("%d", local->debug_id); | |
568 | ||
569 | iov[0].iov_base = &whdr; | |
570 | iov[0].iov_len = sizeof(whdr); | |
571 | iov[1].iov_base = &code; | |
572 | iov[1].iov_len = sizeof(code); | |
248f219c | 573 | |
1c2bc7b9 | 574 | msg.msg_name = &srx.transport; |
248f219c DH |
575 | msg.msg_control = NULL; |
576 | msg.msg_controllen = 0; | |
577 | msg.msg_flags = 0; | |
578 | ||
248f219c | 579 | memset(&whdr, 0, sizeof(whdr)); |
248f219c DH |
580 | |
581 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
987db9f7 | 582 | rxrpc_see_skb(skb, rxrpc_skb_seen); |
248f219c | 583 | sp = rxrpc_skb(skb); |
1c2bc7b9 | 584 | |
ece64fec DH |
585 | switch (skb->mark) { |
586 | case RXRPC_SKB_MARK_REJECT_BUSY: | |
587 | whdr.type = RXRPC_PACKET_TYPE_BUSY; | |
588 | size = sizeof(whdr); | |
589 | ioc = 1; | |
590 | break; | |
591 | case RXRPC_SKB_MARK_REJECT_ABORT: | |
592 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
593 | code = htonl(skb->priority); | |
594 | size = sizeof(whdr) + sizeof(code); | |
595 | ioc = 2; | |
596 | break; | |
597 | default: | |
987db9f7 | 598 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
ece64fec DH |
599 | continue; |
600 | } | |
601 | ||
5a790b73 | 602 | if (rxrpc_extract_addr_from_skb(&srx, skb) == 0) { |
1c2bc7b9 DH |
603 | msg.msg_namelen = srx.transport_len; |
604 | ||
248f219c DH |
605 | whdr.epoch = htonl(sp->hdr.epoch); |
606 | whdr.cid = htonl(sp->hdr.cid); | |
607 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
608 | whdr.serviceId = htons(sp->hdr.serviceId); | |
609 | whdr.flags = sp->hdr.flags; | |
610 | whdr.flags ^= RXRPC_CLIENT_INITIATED; | |
611 | whdr.flags &= RXRPC_CLIENT_INITIATED; | |
612 | ||
d6672a5a Y |
613 | ret = kernel_sendmsg(local->socket, &msg, |
614 | iov, ioc, size); | |
6b47fe1d DH |
615 | if (ret < 0) |
616 | trace_rxrpc_tx_fail(local->debug_id, 0, ret, | |
4764c0da DH |
617 | rxrpc_tx_point_reject); |
618 | else | |
619 | trace_rxrpc_tx_packet(local->debug_id, &whdr, | |
620 | rxrpc_tx_point_reject); | |
248f219c DH |
621 | } |
622 | ||
987db9f7 | 623 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
248f219c DH |
624 | } |
625 | ||
626 | _leave(""); | |
627 | } | |
ace45bec DH |
628 | |
629 | /* | |
630 | * Send a VERSION reply to a peer as a keepalive. | |
631 | */ | |
632 | void rxrpc_send_keepalive(struct rxrpc_peer *peer) | |
633 | { | |
634 | struct rxrpc_wire_header whdr; | |
635 | struct msghdr msg; | |
636 | struct kvec iov[2]; | |
637 | size_t len; | |
638 | int ret; | |
639 | ||
640 | _enter(""); | |
641 | ||
642 | msg.msg_name = &peer->srx.transport; | |
643 | msg.msg_namelen = peer->srx.transport_len; | |
644 | msg.msg_control = NULL; | |
645 | msg.msg_controllen = 0; | |
646 | msg.msg_flags = 0; | |
647 | ||
648 | whdr.epoch = htonl(peer->local->rxnet->epoch); | |
649 | whdr.cid = 0; | |
650 | whdr.callNumber = 0; | |
651 | whdr.seq = 0; | |
652 | whdr.serial = 0; | |
653 | whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ | |
654 | whdr.flags = RXRPC_LAST_PACKET; | |
655 | whdr.userStatus = 0; | |
656 | whdr.securityIndex = 0; | |
657 | whdr._rsvd = 0; | |
658 | whdr.serviceId = 0; | |
659 | ||
660 | iov[0].iov_base = &whdr; | |
661 | iov[0].iov_len = sizeof(whdr); | |
662 | iov[1].iov_base = (char *)rxrpc_keepalive_string; | |
663 | iov[1].iov_len = sizeof(rxrpc_keepalive_string); | |
664 | ||
665 | len = iov[0].iov_len + iov[1].iov_len; | |
666 | ||
667 | _proto("Tx VERSION (keepalive)"); | |
668 | ||
669 | ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len); | |
670 | if (ret < 0) | |
6b47fe1d | 671 | trace_rxrpc_tx_fail(peer->debug_id, 0, ret, |
4764c0da DH |
672 | rxrpc_tx_point_version_keepalive); |
673 | else | |
674 | trace_rxrpc_tx_packet(peer->debug_id, &whdr, | |
675 | rxrpc_tx_point_version_keepalive); | |
ace45bec | 676 | |
330bdcfa | 677 | peer->last_tx_at = ktime_get_seconds(); |
ace45bec DH |
678 | _leave(""); |
679 | } |