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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 | ||
26cb02aa | 22 | struct rxrpc_ack_buffer { |
8d94aa38 | 23 | struct rxrpc_wire_header whdr; |
26cb02aa DH |
24 | struct rxrpc_ackpacket ack; |
25 | u8 acks[255]; | |
26 | u8 pad[3]; | |
8d94aa38 DH |
27 | struct rxrpc_ackinfo ackinfo; |
28 | }; | |
29 | ||
26cb02aa DH |
30 | struct rxrpc_abort_buffer { |
31 | struct rxrpc_wire_header whdr; | |
32 | __be32 abort_code; | |
33 | }; | |
34 | ||
ace45bec DH |
35 | static const char rxrpc_keepalive_string[] = ""; |
36 | ||
415f44e4 DH |
37 | /* |
38 | * Arrange for a keepalive ping a certain time after we last transmitted. This | |
39 | * lets the far side know we're still interested in this call and helps keep | |
40 | * the route through any intervening firewall open. | |
41 | * | |
42 | * Receiving a response to the ping will prevent the ->expect_rx_by timer from | |
43 | * expiring. | |
44 | */ | |
45 | static void rxrpc_set_keepalive(struct rxrpc_call *call) | |
46 | { | |
47 | unsigned long now = jiffies, keepalive_at = call->next_rx_timo / 6; | |
48 | ||
49 | keepalive_at += now; | |
50 | WRITE_ONCE(call->keepalive_at, keepalive_at); | |
51 | rxrpc_reduce_call_timer(call, keepalive_at, now, | |
52 | rxrpc_timer_set_for_keepalive); | |
53 | } | |
54 | ||
8d94aa38 DH |
55 | /* |
56 | * Fill out an ACK packet. | |
57 | */ | |
1457cc4c DH |
58 | static size_t rxrpc_fill_out_ack(struct rxrpc_connection *conn, |
59 | struct rxrpc_call *call, | |
26cb02aa | 60 | struct rxrpc_ack_buffer *pkt, |
805b21b9 | 61 | rxrpc_seq_t *_hard_ack, |
a5af7e1f DH |
62 | rxrpc_seq_t *_top, |
63 | u8 reason) | |
8d94aa38 | 64 | { |
f3639df2 | 65 | rxrpc_serial_t serial; |
248f219c DH |
66 | rxrpc_seq_t hard_ack, top, seq; |
67 | int ix; | |
8d94aa38 DH |
68 | u32 mtu, jmax; |
69 | u8 *ackp = pkt->acks; | |
70 | ||
248f219c | 71 | /* Barrier against rxrpc_input_data(). */ |
f3639df2 | 72 | serial = call->ackr_serial; |
248f219c DH |
73 | hard_ack = READ_ONCE(call->rx_hard_ack); |
74 | top = smp_load_acquire(&call->rx_top); | |
805b21b9 DH |
75 | *_hard_ack = hard_ack; |
76 | *_top = top; | |
248f219c | 77 | |
8d94aa38 | 78 | pkt->ack.bufferSpace = htons(8); |
248f219c DH |
79 | pkt->ack.maxSkew = htons(call->ackr_skew); |
80 | pkt->ack.firstPacket = htonl(hard_ack + 1); | |
8d94aa38 | 81 | pkt->ack.previousPacket = htonl(call->ackr_prev_seq); |
f3639df2 | 82 | pkt->ack.serial = htonl(serial); |
a5af7e1f | 83 | pkt->ack.reason = reason; |
248f219c DH |
84 | pkt->ack.nAcks = top - hard_ack; |
85 | ||
a5af7e1f | 86 | if (reason == RXRPC_ACK_PING) |
8e83134d DH |
87 | pkt->whdr.flags |= RXRPC_REQUEST_ACK; |
88 | ||
248f219c DH |
89 | if (after(top, hard_ack)) { |
90 | seq = hard_ack + 1; | |
91 | do { | |
92 | ix = seq & RXRPC_RXTX_BUFF_MASK; | |
93 | if (call->rxtx_buffer[ix]) | |
94 | *ackp++ = RXRPC_ACK_TYPE_ACK; | |
95 | else | |
96 | *ackp++ = RXRPC_ACK_TYPE_NACK; | |
97 | seq++; | |
98 | } while (before_eq(seq, top)); | |
99 | } | |
8d94aa38 | 100 | |
1457cc4c DH |
101 | mtu = conn->params.peer->if_mtu; |
102 | mtu -= conn->params.peer->hdrsize; | |
75e42126 | 103 | jmax = (call->nr_jumbo_bad > 3) ? 1 : rxrpc_rx_jumbo_max; |
8d94aa38 DH |
104 | pkt->ackinfo.rxMTU = htonl(rxrpc_rx_mtu); |
105 | pkt->ackinfo.maxMTU = htonl(mtu); | |
75e42126 | 106 | pkt->ackinfo.rwind = htonl(call->rx_winsize); |
8d94aa38 DH |
107 | pkt->ackinfo.jumbo_max = htonl(jmax); |
108 | ||
109 | *ackp++ = 0; | |
110 | *ackp++ = 0; | |
111 | *ackp++ = 0; | |
248f219c | 112 | return top - hard_ack + 3; |
8d94aa38 DH |
113 | } |
114 | ||
115 | /* | |
26cb02aa | 116 | * Send an ACK call packet. |
8d94aa38 | 117 | */ |
bd1fdf8c DH |
118 | int rxrpc_send_ack_packet(struct rxrpc_call *call, bool ping, |
119 | rxrpc_serial_t *_serial) | |
8d94aa38 DH |
120 | { |
121 | struct rxrpc_connection *conn = NULL; | |
26cb02aa | 122 | struct rxrpc_ack_buffer *pkt; |
8d94aa38 DH |
123 | struct msghdr msg; |
124 | struct kvec iov[2]; | |
125 | rxrpc_serial_t serial; | |
805b21b9 | 126 | rxrpc_seq_t hard_ack, top; |
ace45bec | 127 | ktime_t now; |
8d94aa38 | 128 | size_t len, n; |
26cb02aa | 129 | int ret; |
a5af7e1f | 130 | u8 reason; |
8d94aa38 DH |
131 | |
132 | spin_lock_bh(&call->lock); | |
133 | if (call->conn) | |
134 | conn = rxrpc_get_connection_maybe(call->conn); | |
135 | spin_unlock_bh(&call->lock); | |
136 | if (!conn) | |
137 | return -ECONNRESET; | |
138 | ||
139 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); | |
140 | if (!pkt) { | |
141 | rxrpc_put_connection(conn); | |
142 | return -ENOMEM; | |
143 | } | |
144 | ||
8d94aa38 DH |
145 | msg.msg_name = &call->peer->srx.transport; |
146 | msg.msg_namelen = call->peer->srx.transport_len; | |
147 | msg.msg_control = NULL; | |
148 | msg.msg_controllen = 0; | |
149 | msg.msg_flags = 0; | |
150 | ||
151 | pkt->whdr.epoch = htonl(conn->proto.epoch); | |
152 | pkt->whdr.cid = htonl(call->cid); | |
153 | pkt->whdr.callNumber = htonl(call->call_id); | |
154 | pkt->whdr.seq = 0; | |
26cb02aa DH |
155 | pkt->whdr.type = RXRPC_PACKET_TYPE_ACK; |
156 | pkt->whdr.flags = RXRPC_SLOW_START_OK | conn->out_clientflag; | |
8d94aa38 DH |
157 | pkt->whdr.userStatus = 0; |
158 | pkt->whdr.securityIndex = call->security_ix; | |
159 | pkt->whdr._rsvd = 0; | |
160 | pkt->whdr.serviceId = htons(call->service_id); | |
161 | ||
26cb02aa | 162 | spin_lock_bh(&call->lock); |
a5af7e1f DH |
163 | if (ping) { |
164 | reason = RXRPC_ACK_PING; | |
165 | } else { | |
166 | reason = call->ackr_reason; | |
167 | if (!call->ackr_reason) { | |
168 | spin_unlock_bh(&call->lock); | |
169 | ret = 0; | |
170 | goto out; | |
171 | } | |
172 | call->ackr_reason = 0; | |
8d94aa38 | 173 | } |
1457cc4c | 174 | n = rxrpc_fill_out_ack(conn, call, pkt, &hard_ack, &top, reason); |
26cb02aa DH |
175 | |
176 | spin_unlock_bh(&call->lock); | |
177 | ||
178 | iov[0].iov_base = pkt; | |
179 | iov[0].iov_len = sizeof(pkt->whdr) + sizeof(pkt->ack) + n; | |
180 | iov[1].iov_base = &pkt->ackinfo; | |
181 | iov[1].iov_len = sizeof(pkt->ackinfo); | |
182 | len = iov[0].iov_len + iov[1].iov_len; | |
8d94aa38 | 183 | |
b86e218e DH |
184 | serial = atomic_inc_return(&conn->serial); |
185 | pkt->whdr.serial = htonl(serial); | |
26cb02aa DH |
186 | trace_rxrpc_tx_ack(call, serial, |
187 | ntohl(pkt->ack.firstPacket), | |
188 | ntohl(pkt->ack.serial), | |
189 | pkt->ack.reason, pkt->ack.nAcks); | |
bd1fdf8c DH |
190 | if (_serial) |
191 | *_serial = serial; | |
b86e218e | 192 | |
8e83134d | 193 | if (ping) { |
a5af7e1f | 194 | call->ping_serial = serial; |
8e83134d DH |
195 | smp_wmb(); |
196 | /* We need to stick a time in before we send the packet in case | |
197 | * the reply gets back before kernel_sendmsg() completes - but | |
198 | * asking UDP to send the packet can take a relatively long | |
199 | * time, so we update the time after, on the assumption that | |
200 | * the packet transmission is more likely to happen towards the | |
201 | * end of the kernel_sendmsg() call. | |
202 | */ | |
a5af7e1f | 203 | call->ping_time = ktime_get_real(); |
8e83134d DH |
204 | set_bit(RXRPC_CALL_PINGING, &call->flags); |
205 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_ping, serial); | |
206 | } | |
26cb02aa DH |
207 | |
208 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
ace45bec | 209 | now = ktime_get_real(); |
8e83134d | 210 | if (ping) |
ace45bec DH |
211 | call->ping_time = now; |
212 | conn->params.peer->last_tx_at = ktime_get_real(); | |
6b47fe1d DH |
213 | if (ret < 0) |
214 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
215 | rxrpc_tx_fail_call_ack); | |
8d94aa38 | 216 | |
26cb02aa | 217 | if (call->state < RXRPC_CALL_COMPLETE) { |
805b21b9 | 218 | if (ret < 0) { |
a5af7e1f DH |
219 | if (ping) |
220 | clear_bit(RXRPC_CALL_PINGING, &call->flags); | |
248f219c DH |
221 | rxrpc_propose_ACK(call, pkt->ack.reason, |
222 | ntohs(pkt->ack.maxSkew), | |
223 | ntohl(pkt->ack.serial), | |
9c7ad434 DH |
224 | true, true, |
225 | rxrpc_propose_ack_retry_tx); | |
805b21b9 DH |
226 | } else { |
227 | spin_lock_bh(&call->lock); | |
228 | if (after(hard_ack, call->ackr_consumed)) | |
229 | call->ackr_consumed = hard_ack; | |
230 | if (after(top, call->ackr_seen)) | |
231 | call->ackr_seen = top; | |
232 | spin_unlock_bh(&call->lock); | |
248f219c | 233 | } |
415f44e4 DH |
234 | |
235 | rxrpc_set_keepalive(call); | |
248f219c DH |
236 | } |
237 | ||
8d94aa38 DH |
238 | out: |
239 | rxrpc_put_connection(conn); | |
240 | kfree(pkt); | |
241 | return ret; | |
242 | } | |
243 | ||
26cb02aa DH |
244 | /* |
245 | * Send an ABORT call packet. | |
246 | */ | |
247 | int rxrpc_send_abort_packet(struct rxrpc_call *call) | |
248 | { | |
249 | struct rxrpc_connection *conn = NULL; | |
250 | struct rxrpc_abort_buffer pkt; | |
251 | struct msghdr msg; | |
252 | struct kvec iov[1]; | |
253 | rxrpc_serial_t serial; | |
254 | int ret; | |
255 | ||
dcbefc30 DH |
256 | /* Don't bother sending aborts for a client call once the server has |
257 | * hard-ACK'd all of its request data. After that point, we're not | |
258 | * going to stop the operation proceeding, and whilst we might limit | |
259 | * the reply, it's not worth it if we can send a new call on the same | |
260 | * channel instead, thereby closing off this call. | |
261 | */ | |
262 | if (rxrpc_is_client_call(call) && | |
263 | test_bit(RXRPC_CALL_TX_LAST, &call->flags)) | |
264 | return 0; | |
265 | ||
26cb02aa DH |
266 | spin_lock_bh(&call->lock); |
267 | if (call->conn) | |
268 | conn = rxrpc_get_connection_maybe(call->conn); | |
269 | spin_unlock_bh(&call->lock); | |
270 | if (!conn) | |
271 | return -ECONNRESET; | |
272 | ||
273 | msg.msg_name = &call->peer->srx.transport; | |
274 | msg.msg_namelen = call->peer->srx.transport_len; | |
275 | msg.msg_control = NULL; | |
276 | msg.msg_controllen = 0; | |
277 | msg.msg_flags = 0; | |
278 | ||
279 | pkt.whdr.epoch = htonl(conn->proto.epoch); | |
280 | pkt.whdr.cid = htonl(call->cid); | |
281 | pkt.whdr.callNumber = htonl(call->call_id); | |
282 | pkt.whdr.seq = 0; | |
283 | pkt.whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
284 | pkt.whdr.flags = conn->out_clientflag; | |
285 | pkt.whdr.userStatus = 0; | |
286 | pkt.whdr.securityIndex = call->security_ix; | |
287 | pkt.whdr._rsvd = 0; | |
288 | pkt.whdr.serviceId = htons(call->service_id); | |
289 | pkt.abort_code = htonl(call->abort_code); | |
290 | ||
291 | iov[0].iov_base = &pkt; | |
292 | iov[0].iov_len = sizeof(pkt); | |
293 | ||
294 | serial = atomic_inc_return(&conn->serial); | |
295 | pkt.whdr.serial = htonl(serial); | |
296 | ||
297 | ret = kernel_sendmsg(conn->params.local->socket, | |
298 | &msg, iov, 1, sizeof(pkt)); | |
ace45bec | 299 | conn->params.peer->last_tx_at = ktime_get_real(); |
6b47fe1d DH |
300 | if (ret < 0) |
301 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
302 | rxrpc_tx_fail_call_abort); | |
303 | ||
26cb02aa DH |
304 | |
305 | rxrpc_put_connection(conn); | |
306 | return ret; | |
307 | } | |
308 | ||
17926a79 DH |
309 | /* |
310 | * send a packet through the transport endpoint | |
311 | */ | |
a1767077 DH |
312 | int rxrpc_send_data_packet(struct rxrpc_call *call, struct sk_buff *skb, |
313 | bool retrans) | |
17926a79 | 314 | { |
5a924b89 DH |
315 | struct rxrpc_connection *conn = call->conn; |
316 | struct rxrpc_wire_header whdr; | |
317 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); | |
17926a79 | 318 | struct msghdr msg; |
5a924b89 DH |
319 | struct kvec iov[2]; |
320 | rxrpc_serial_t serial; | |
321 | size_t len; | |
a1767077 | 322 | bool lost = false; |
17926a79 DH |
323 | int ret, opt; |
324 | ||
325 | _enter(",{%d}", skb->len); | |
326 | ||
5a924b89 DH |
327 | /* Each transmission of a Tx packet needs a new serial number */ |
328 | serial = atomic_inc_return(&conn->serial); | |
17926a79 | 329 | |
5a924b89 DH |
330 | whdr.epoch = htonl(conn->proto.epoch); |
331 | whdr.cid = htonl(call->cid); | |
332 | whdr.callNumber = htonl(call->call_id); | |
333 | whdr.seq = htonl(sp->hdr.seq); | |
334 | whdr.serial = htonl(serial); | |
335 | whdr.type = RXRPC_PACKET_TYPE_DATA; | |
336 | whdr.flags = sp->hdr.flags; | |
337 | whdr.userStatus = 0; | |
338 | whdr.securityIndex = call->security_ix; | |
339 | whdr._rsvd = htons(sp->hdr._rsvd); | |
340 | whdr.serviceId = htons(call->service_id); | |
341 | ||
4e255721 DH |
342 | if (test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags) && |
343 | sp->hdr.seq == 1) | |
344 | whdr.userStatus = RXRPC_USERSTATUS_SERVICE_UPGRADE; | |
345 | ||
5a924b89 DH |
346 | iov[0].iov_base = &whdr; |
347 | iov[0].iov_len = sizeof(whdr); | |
348 | iov[1].iov_base = skb->head; | |
349 | iov[1].iov_len = skb->len; | |
350 | len = iov[0].iov_len + iov[1].iov_len; | |
351 | ||
352 | msg.msg_name = &call->peer->srx.transport; | |
353 | msg.msg_namelen = call->peer->srx.transport_len; | |
17926a79 DH |
354 | msg.msg_control = NULL; |
355 | msg.msg_controllen = 0; | |
356 | msg.msg_flags = 0; | |
357 | ||
57494343 DH |
358 | /* If our RTT cache needs working on, request an ACK. Also request |
359 | * ACKs if a DATA packet appears to have been lost. | |
360 | */ | |
bf7d620a | 361 | if (!(sp->hdr.flags & RXRPC_LAST_PACKET) && |
bd1fdf8c DH |
362 | (test_and_clear_bit(RXRPC_CALL_EV_ACK_LOST, &call->events) || |
363 | retrans || | |
bf7d620a DH |
364 | call->cong_mode == RXRPC_CALL_SLOW_START || |
365 | (call->peer->rtt_usage < 3 && sp->hdr.seq & 1) || | |
366 | ktime_before(ktime_add_ms(call->peer->rtt_last_req, 1000), | |
367 | ktime_get_real()))) | |
0d4b103c DH |
368 | whdr.flags |= RXRPC_REQUEST_ACK; |
369 | ||
8a681c36 DH |
370 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
371 | static int lose; | |
372 | if ((lose++ & 7) == 7) { | |
a1767077 DH |
373 | ret = 0; |
374 | lost = true; | |
375 | goto done; | |
8a681c36 DH |
376 | } |
377 | } | |
378 | ||
5a924b89 DH |
379 | _proto("Tx DATA %%%u { #%u }", serial, sp->hdr.seq); |
380 | ||
17926a79 DH |
381 | /* send the packet with the don't fragment bit set if we currently |
382 | * think it's small enough */ | |
5a924b89 DH |
383 | if (iov[1].iov_len >= call->peer->maxdata) |
384 | goto send_fragmentable; | |
385 | ||
386 | down_read(&conn->params.local->defrag_sem); | |
387 | /* send the packet by UDP | |
388 | * - returns -EMSGSIZE if UDP would have to fragment the packet | |
389 | * to go out of the interface | |
390 | * - in which case, we'll have processed the ICMP error | |
391 | * message and update the peer record | |
392 | */ | |
393 | ret = kernel_sendmsg(conn->params.local->socket, &msg, iov, 2, len); | |
ace45bec | 394 | conn->params.peer->last_tx_at = ktime_get_real(); |
5a924b89 DH |
395 | |
396 | up_read(&conn->params.local->defrag_sem); | |
6b47fe1d DH |
397 | if (ret < 0) |
398 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
399 | rxrpc_tx_fail_call_data_nofrag); | |
5a924b89 DH |
400 | if (ret == -EMSGSIZE) |
401 | goto send_fragmentable; | |
402 | ||
403 | done: | |
a1767077 DH |
404 | trace_rxrpc_tx_data(call, sp->hdr.seq, serial, whdr.flags, |
405 | retrans, lost); | |
50235c4b | 406 | if (ret >= 0) { |
0d4b103c DH |
407 | ktime_t now = ktime_get_real(); |
408 | skb->tstamp = now; | |
50235c4b | 409 | smp_wmb(); |
5a924b89 | 410 | sp->hdr.serial = serial; |
0d4b103c DH |
411 | if (whdr.flags & RXRPC_REQUEST_ACK) { |
412 | call->peer->rtt_last_req = now; | |
50235c4b | 413 | trace_rxrpc_rtt_tx(call, rxrpc_rtt_tx_data, serial); |
bd1fdf8c DH |
414 | if (call->peer->rtt_usage > 1) { |
415 | unsigned long nowj = jiffies, ack_lost_at; | |
416 | ||
417 | ack_lost_at = nsecs_to_jiffies(2 * call->peer->rtt); | |
418 | if (ack_lost_at < 1) | |
419 | ack_lost_at = 1; | |
420 | ||
421 | ack_lost_at += nowj; | |
422 | WRITE_ONCE(call->ack_lost_at, ack_lost_at); | |
423 | rxrpc_reduce_call_timer(call, ack_lost_at, nowj, | |
424 | rxrpc_timer_set_for_lost_ack); | |
425 | } | |
0d4b103c | 426 | } |
c54e43d7 DH |
427 | |
428 | if (sp->hdr.seq == 1 && | |
429 | !test_and_set_bit(RXRPC_CALL_BEGAN_RX_TIMER, | |
430 | &call->flags)) { | |
431 | unsigned long nowj = jiffies, expect_rx_by; | |
432 | ||
433 | expect_rx_by = nowj + call->next_rx_timo; | |
434 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); | |
435 | rxrpc_reduce_call_timer(call, expect_rx_by, nowj, | |
436 | rxrpc_timer_set_for_normal); | |
437 | } | |
17926a79 | 438 | } |
415f44e4 DH |
439 | |
440 | rxrpc_set_keepalive(call); | |
441 | ||
5a924b89 DH |
442 | _leave(" = %d [%u]", ret, call->peer->maxdata); |
443 | return ret; | |
17926a79 DH |
444 | |
445 | send_fragmentable: | |
446 | /* attempt to send this message with fragmentation enabled */ | |
447 | _debug("send fragment"); | |
448 | ||
985a5c82 DH |
449 | down_write(&conn->params.local->defrag_sem); |
450 | ||
451 | switch (conn->params.local->srx.transport.family) { | |
452 | case AF_INET: | |
453 | opt = IP_PMTUDISC_DONT; | |
454 | ret = kernel_setsockopt(conn->params.local->socket, | |
455 | SOL_IP, IP_MTU_DISCOVER, | |
456 | (char *)&opt, sizeof(opt)); | |
457 | if (ret == 0) { | |
5a924b89 DH |
458 | ret = kernel_sendmsg(conn->params.local->socket, &msg, |
459 | iov, 2, len); | |
ace45bec | 460 | conn->params.peer->last_tx_at = ktime_get_real(); |
985a5c82 DH |
461 | |
462 | opt = IP_PMTUDISC_DO; | |
463 | kernel_setsockopt(conn->params.local->socket, SOL_IP, | |
464 | IP_MTU_DISCOVER, | |
465 | (char *)&opt, sizeof(opt)); | |
466 | } | |
467 | break; | |
75b54cb5 | 468 | |
d1912747 | 469 | #ifdef CONFIG_AF_RXRPC_IPV6 |
75b54cb5 DH |
470 | case AF_INET6: |
471 | opt = IPV6_PMTUDISC_DONT; | |
472 | ret = kernel_setsockopt(conn->params.local->socket, | |
473 | SOL_IPV6, IPV6_MTU_DISCOVER, | |
474 | (char *)&opt, sizeof(opt)); | |
475 | if (ret == 0) { | |
476 | ret = kernel_sendmsg(conn->params.local->socket, &msg, | |
93c62c45 | 477 | iov, 2, len); |
ace45bec | 478 | conn->params.peer->last_tx_at = ktime_get_real(); |
75b54cb5 DH |
479 | |
480 | opt = IPV6_PMTUDISC_DO; | |
481 | kernel_setsockopt(conn->params.local->socket, | |
482 | SOL_IPV6, IPV6_MTU_DISCOVER, | |
483 | (char *)&opt, sizeof(opt)); | |
484 | } | |
485 | break; | |
d1912747 | 486 | #endif |
17926a79 DH |
487 | } |
488 | ||
6b47fe1d DH |
489 | if (ret < 0) |
490 | trace_rxrpc_tx_fail(call->debug_id, serial, ret, | |
491 | rxrpc_tx_fail_call_data_frag); | |
492 | ||
985a5c82 | 493 | up_write(&conn->params.local->defrag_sem); |
5a924b89 | 494 | goto done; |
17926a79 | 495 | } |
248f219c DH |
496 | |
497 | /* | |
498 | * reject packets through the local endpoint | |
499 | */ | |
500 | void rxrpc_reject_packets(struct rxrpc_local *local) | |
501 | { | |
1c2bc7b9 | 502 | struct sockaddr_rxrpc srx; |
248f219c DH |
503 | struct rxrpc_skb_priv *sp; |
504 | struct rxrpc_wire_header whdr; | |
505 | struct sk_buff *skb; | |
506 | struct msghdr msg; | |
507 | struct kvec iov[2]; | |
508 | size_t size; | |
509 | __be32 code; | |
6b47fe1d | 510 | int ret; |
248f219c DH |
511 | |
512 | _enter("%d", local->debug_id); | |
513 | ||
514 | iov[0].iov_base = &whdr; | |
515 | iov[0].iov_len = sizeof(whdr); | |
516 | iov[1].iov_base = &code; | |
517 | iov[1].iov_len = sizeof(code); | |
518 | size = sizeof(whdr) + sizeof(code); | |
519 | ||
1c2bc7b9 | 520 | msg.msg_name = &srx.transport; |
248f219c DH |
521 | msg.msg_control = NULL; |
522 | msg.msg_controllen = 0; | |
523 | msg.msg_flags = 0; | |
524 | ||
248f219c DH |
525 | memset(&whdr, 0, sizeof(whdr)); |
526 | whdr.type = RXRPC_PACKET_TYPE_ABORT; | |
527 | ||
528 | while ((skb = skb_dequeue(&local->reject_queue))) { | |
71f3ca40 | 529 | rxrpc_see_skb(skb, rxrpc_skb_rx_seen); |
248f219c | 530 | sp = rxrpc_skb(skb); |
1c2bc7b9 | 531 | |
7b674e39 | 532 | if (rxrpc_extract_addr_from_skb(local, &srx, skb) == 0) { |
1c2bc7b9 DH |
533 | msg.msg_namelen = srx.transport_len; |
534 | ||
248f219c DH |
535 | code = htonl(skb->priority); |
536 | ||
537 | whdr.epoch = htonl(sp->hdr.epoch); | |
538 | whdr.cid = htonl(sp->hdr.cid); | |
539 | whdr.callNumber = htonl(sp->hdr.callNumber); | |
540 | whdr.serviceId = htons(sp->hdr.serviceId); | |
541 | whdr.flags = sp->hdr.flags; | |
542 | whdr.flags ^= RXRPC_CLIENT_INITIATED; | |
543 | whdr.flags &= RXRPC_CLIENT_INITIATED; | |
544 | ||
6b47fe1d DH |
545 | ret = kernel_sendmsg(local->socket, &msg, iov, 2, size); |
546 | if (ret < 0) | |
547 | trace_rxrpc_tx_fail(local->debug_id, 0, ret, | |
548 | rxrpc_tx_fail_reject); | |
248f219c DH |
549 | } |
550 | ||
71f3ca40 | 551 | rxrpc_free_skb(skb, rxrpc_skb_rx_freed); |
248f219c DH |
552 | } |
553 | ||
554 | _leave(""); | |
555 | } | |
ace45bec DH |
556 | |
557 | /* | |
558 | * Send a VERSION reply to a peer as a keepalive. | |
559 | */ | |
560 | void rxrpc_send_keepalive(struct rxrpc_peer *peer) | |
561 | { | |
562 | struct rxrpc_wire_header whdr; | |
563 | struct msghdr msg; | |
564 | struct kvec iov[2]; | |
565 | size_t len; | |
566 | int ret; | |
567 | ||
568 | _enter(""); | |
569 | ||
570 | msg.msg_name = &peer->srx.transport; | |
571 | msg.msg_namelen = peer->srx.transport_len; | |
572 | msg.msg_control = NULL; | |
573 | msg.msg_controllen = 0; | |
574 | msg.msg_flags = 0; | |
575 | ||
576 | whdr.epoch = htonl(peer->local->rxnet->epoch); | |
577 | whdr.cid = 0; | |
578 | whdr.callNumber = 0; | |
579 | whdr.seq = 0; | |
580 | whdr.serial = 0; | |
581 | whdr.type = RXRPC_PACKET_TYPE_VERSION; /* Not client-initiated */ | |
582 | whdr.flags = RXRPC_LAST_PACKET; | |
583 | whdr.userStatus = 0; | |
584 | whdr.securityIndex = 0; | |
585 | whdr._rsvd = 0; | |
586 | whdr.serviceId = 0; | |
587 | ||
588 | iov[0].iov_base = &whdr; | |
589 | iov[0].iov_len = sizeof(whdr); | |
590 | iov[1].iov_base = (char *)rxrpc_keepalive_string; | |
591 | iov[1].iov_len = sizeof(rxrpc_keepalive_string); | |
592 | ||
593 | len = iov[0].iov_len + iov[1].iov_len; | |
594 | ||
595 | _proto("Tx VERSION (keepalive)"); | |
596 | ||
597 | ret = kernel_sendmsg(peer->local->socket, &msg, iov, 2, len); | |
598 | if (ret < 0) | |
6b47fe1d DH |
599 | trace_rxrpc_tx_fail(peer->debug_id, 0, ret, |
600 | rxrpc_tx_fail_version_keepalive); | |
ace45bec DH |
601 | |
602 | peer->last_tx_at = ktime_get_real(); | |
603 | _leave(""); | |
604 | } |