Thomas Gleixner | 2874c5f | 2019-05-27 08:55:01 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 2 | /* RxRPC packet reception |
| 3 | * |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 4 | * Copyright (C) 2007, 2016 Red Hat, Inc. All Rights Reserved. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 5 | * Written by David Howells (dhowells@redhat.com) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 6 | */ |
| 7 | |
Joe Perches | 9b6d539 | 2016-06-02 12:08:52 -0700 | [diff] [blame] | 8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 9 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
| 11 | #include <linux/net.h> |
| 12 | #include <linux/skbuff.h> |
| 13 | #include <linux/errqueue.h> |
| 14 | #include <linux/udp.h> |
| 15 | #include <linux/in.h> |
| 16 | #include <linux/in6.h> |
| 17 | #include <linux/icmp.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/gfp.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 19 | #include <net/sock.h> |
| 20 | #include <net/af_rxrpc.h> |
| 21 | #include <net/ip.h> |
Herbert Xu | 1781f7f | 2007-12-11 11:30:32 -0800 | [diff] [blame] | 22 | #include <net/udp.h> |
Pavel Emelyanov | 0283328 | 2008-07-05 21:18:48 -0700 | [diff] [blame] | 23 | #include <net/net_namespace.h> |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 24 | #include "ar-internal.h" |
| 25 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 26 | static void rxrpc_proto_abort(const char *why, |
| 27 | struct rxrpc_call *call, rxrpc_seq_t seq) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 28 | { |
David Howells | 3a92789 | 2017-04-06 10:11:56 +0100 | [diff] [blame] | 29 | if (rxrpc_abort_call(why, call, seq, RX_PROTOCOL_ERROR, -EBADMSG)) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 30 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
| 31 | rxrpc_queue_call(call); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 32 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 33 | } |
| 34 | |
| 35 | /* |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 36 | * Do TCP-style congestion management [RFC 5681]. |
| 37 | */ |
| 38 | static void rxrpc_congestion_management(struct rxrpc_call *call, |
| 39 | struct sk_buff *skb, |
David Howells | ed1e867 | 2016-09-29 22:37:16 +0100 | [diff] [blame] | 40 | struct rxrpc_ack_summary *summary, |
| 41 | rxrpc_serial_t acked_serial) |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 42 | { |
| 43 | enum rxrpc_congest_change change = rxrpc_cong_no_change; |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 44 | unsigned int cumulative_acks = call->cong_cumul_acks; |
| 45 | unsigned int cwnd = call->cong_cwnd; |
| 46 | bool resend = false; |
| 47 | |
| 48 | summary->flight_size = |
| 49 | (call->tx_top - call->tx_hard_ack) - summary->nr_acks; |
| 50 | |
| 51 | if (test_and_clear_bit(RXRPC_CALL_RETRANS_TIMEOUT, &call->flags)) { |
| 52 | summary->retrans_timeo = true; |
| 53 | call->cong_ssthresh = max_t(unsigned int, |
| 54 | summary->flight_size / 2, 2); |
| 55 | cwnd = 1; |
David Howells | 8782def | 2016-09-30 09:26:12 +0100 | [diff] [blame] | 56 | if (cwnd >= call->cong_ssthresh && |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 57 | call->cong_mode == RXRPC_CALL_SLOW_START) { |
| 58 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; |
| 59 | call->cong_tstamp = skb->tstamp; |
| 60 | cumulative_acks = 0; |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | cumulative_acks += summary->nr_new_acks; |
| 65 | cumulative_acks += summary->nr_rot_new_acks; |
| 66 | if (cumulative_acks > 255) |
| 67 | cumulative_acks = 255; |
| 68 | |
| 69 | summary->mode = call->cong_mode; |
| 70 | summary->cwnd = call->cong_cwnd; |
| 71 | summary->ssthresh = call->cong_ssthresh; |
| 72 | summary->cumulative_acks = cumulative_acks; |
| 73 | summary->dup_acks = call->cong_dup_acks; |
| 74 | |
| 75 | switch (call->cong_mode) { |
| 76 | case RXRPC_CALL_SLOW_START: |
| 77 | if (summary->nr_nacks > 0) |
| 78 | goto packet_loss_detected; |
| 79 | if (summary->cumulative_acks > 0) |
| 80 | cwnd += 1; |
David Howells | 8782def | 2016-09-30 09:26:12 +0100 | [diff] [blame] | 81 | if (cwnd >= call->cong_ssthresh) { |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 82 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; |
| 83 | call->cong_tstamp = skb->tstamp; |
| 84 | } |
| 85 | goto out; |
| 86 | |
| 87 | case RXRPC_CALL_CONGEST_AVOIDANCE: |
| 88 | if (summary->nr_nacks > 0) |
| 89 | goto packet_loss_detected; |
| 90 | |
| 91 | /* We analyse the number of packets that get ACK'd per RTT |
| 92 | * period and increase the window if we managed to fill it. |
| 93 | */ |
| 94 | if (call->peer->rtt_usage == 0) |
| 95 | goto out; |
| 96 | if (ktime_before(skb->tstamp, |
| 97 | ktime_add_ns(call->cong_tstamp, |
| 98 | call->peer->rtt))) |
| 99 | goto out_no_clear_ca; |
| 100 | change = rxrpc_cong_rtt_window_end; |
| 101 | call->cong_tstamp = skb->tstamp; |
| 102 | if (cumulative_acks >= cwnd) |
| 103 | cwnd++; |
| 104 | goto out; |
| 105 | |
| 106 | case RXRPC_CALL_PACKET_LOSS: |
| 107 | if (summary->nr_nacks == 0) |
| 108 | goto resume_normality; |
| 109 | |
| 110 | if (summary->new_low_nack) { |
| 111 | change = rxrpc_cong_new_low_nack; |
| 112 | call->cong_dup_acks = 1; |
| 113 | if (call->cong_extra > 1) |
| 114 | call->cong_extra = 1; |
| 115 | goto send_extra_data; |
| 116 | } |
| 117 | |
| 118 | call->cong_dup_acks++; |
| 119 | if (call->cong_dup_acks < 3) |
| 120 | goto send_extra_data; |
| 121 | |
| 122 | change = rxrpc_cong_begin_retransmission; |
| 123 | call->cong_mode = RXRPC_CALL_FAST_RETRANSMIT; |
| 124 | call->cong_ssthresh = max_t(unsigned int, |
| 125 | summary->flight_size / 2, 2); |
| 126 | cwnd = call->cong_ssthresh + 3; |
| 127 | call->cong_extra = 0; |
| 128 | call->cong_dup_acks = 0; |
| 129 | resend = true; |
| 130 | goto out; |
| 131 | |
| 132 | case RXRPC_CALL_FAST_RETRANSMIT: |
| 133 | if (!summary->new_low_nack) { |
| 134 | if (summary->nr_new_acks == 0) |
| 135 | cwnd += 1; |
| 136 | call->cong_dup_acks++; |
| 137 | if (call->cong_dup_acks == 2) { |
| 138 | change = rxrpc_cong_retransmit_again; |
| 139 | call->cong_dup_acks = 0; |
| 140 | resend = true; |
| 141 | } |
| 142 | } else { |
| 143 | change = rxrpc_cong_progress; |
| 144 | cwnd = call->cong_ssthresh; |
| 145 | if (summary->nr_nacks == 0) |
| 146 | goto resume_normality; |
| 147 | } |
| 148 | goto out; |
| 149 | |
| 150 | default: |
| 151 | BUG(); |
| 152 | goto out; |
| 153 | } |
| 154 | |
| 155 | resume_normality: |
| 156 | change = rxrpc_cong_cleared_nacks; |
| 157 | call->cong_dup_acks = 0; |
| 158 | call->cong_extra = 0; |
| 159 | call->cong_tstamp = skb->tstamp; |
David Howells | 8782def | 2016-09-30 09:26:12 +0100 | [diff] [blame] | 160 | if (cwnd < call->cong_ssthresh) |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 161 | call->cong_mode = RXRPC_CALL_SLOW_START; |
| 162 | else |
| 163 | call->cong_mode = RXRPC_CALL_CONGEST_AVOIDANCE; |
| 164 | out: |
| 165 | cumulative_acks = 0; |
| 166 | out_no_clear_ca: |
| 167 | if (cwnd >= RXRPC_RXTX_BUFF_SIZE - 1) |
| 168 | cwnd = RXRPC_RXTX_BUFF_SIZE - 1; |
| 169 | call->cong_cwnd = cwnd; |
| 170 | call->cong_cumul_acks = cumulative_acks; |
David Howells | ed1e867 | 2016-09-29 22:37:16 +0100 | [diff] [blame] | 171 | trace_rxrpc_congest(call, summary, acked_serial, change); |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 172 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
| 173 | rxrpc_queue_call(call); |
| 174 | return; |
| 175 | |
| 176 | packet_loss_detected: |
| 177 | change = rxrpc_cong_saw_nack; |
| 178 | call->cong_mode = RXRPC_CALL_PACKET_LOSS; |
| 179 | call->cong_dup_acks = 0; |
| 180 | goto send_extra_data; |
| 181 | |
| 182 | send_extra_data: |
| 183 | /* Send some previously unsent DATA if we have some to advance the ACK |
| 184 | * state. |
| 185 | */ |
| 186 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & |
| 187 | RXRPC_TX_ANNO_LAST || |
| 188 | summary->nr_acks != call->tx_top - call->tx_hard_ack) { |
| 189 | call->cong_extra++; |
| 190 | wake_up(&call->waitq); |
| 191 | } |
| 192 | goto out_no_clear_ca; |
| 193 | } |
| 194 | |
| 195 | /* |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 196 | * Apply a hard ACK by advancing the Tx window. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 197 | */ |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 198 | static bool rxrpc_rotate_tx_window(struct rxrpc_call *call, rxrpc_seq_t to, |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 199 | struct rxrpc_ack_summary *summary) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 200 | { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 201 | struct sk_buff *skb, *list = NULL; |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 202 | bool rot_last = false; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 203 | int ix; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 204 | u8 annotation; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 205 | |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 206 | if (call->acks_lowest_nak == call->tx_hard_ack) { |
| 207 | call->acks_lowest_nak = to; |
| 208 | } else if (before_eq(call->acks_lowest_nak, to)) { |
| 209 | summary->new_low_nack = true; |
| 210 | call->acks_lowest_nak = to; |
| 211 | } |
| 212 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 213 | spin_lock(&call->lock); |
| 214 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 215 | while (before(call->tx_hard_ack, to)) { |
| 216 | call->tx_hard_ack++; |
| 217 | ix = call->tx_hard_ack & RXRPC_RXTX_BUFF_MASK; |
| 218 | skb = call->rxtx_buffer[ix]; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 219 | annotation = call->rxtx_annotations[ix]; |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 220 | rxrpc_see_skb(skb, rxrpc_skb_rotated); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 221 | call->rxtx_buffer[ix] = NULL; |
| 222 | call->rxtx_annotations[ix] = 0; |
| 223 | skb->next = list; |
| 224 | list = skb; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 225 | |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 226 | if (annotation & RXRPC_TX_ANNO_LAST) { |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 227 | set_bit(RXRPC_CALL_TX_LAST, &call->flags); |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 228 | rot_last = true; |
| 229 | } |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 230 | if ((annotation & RXRPC_TX_ANNO_MASK) != RXRPC_TX_ANNO_ACK) |
| 231 | summary->nr_rot_new_acks++; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 232 | } |
| 233 | |
| 234 | spin_unlock(&call->lock); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 235 | |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 236 | trace_rxrpc_transmit(call, (rot_last ? |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 237 | rxrpc_transmit_rotate_last : |
| 238 | rxrpc_transmit_rotate)); |
David Howells | bc4abfc | 2016-09-13 22:36:21 +0100 | [diff] [blame] | 239 | wake_up(&call->waitq); |
| 240 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 241 | while (list) { |
| 242 | skb = list; |
| 243 | list = skb->next; |
David S. Miller | a8305bf | 2018-07-29 20:42:53 -0700 | [diff] [blame] | 244 | skb_mark_not_on_list(skb); |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 245 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 246 | } |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 247 | |
| 248 | return rot_last; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 249 | } |
| 250 | |
| 251 | /* |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 252 | * End the transmission phase of a call. |
| 253 | * |
| 254 | * This occurs when we get an ACKALL packet, the first DATA packet of a reply, |
| 255 | * or a final ACK packet. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 256 | */ |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 257 | static bool rxrpc_end_tx_phase(struct rxrpc_call *call, bool reply_begun, |
| 258 | const char *abort_why) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 259 | { |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 260 | unsigned int state; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 261 | |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 262 | ASSERT(test_bit(RXRPC_CALL_TX_LAST, &call->flags)); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 263 | |
| 264 | write_lock(&call->state_lock); |
| 265 | |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 266 | state = call->state; |
| 267 | switch (state) { |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 268 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 269 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 270 | if (reply_begun) |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 271 | call->state = state = RXRPC_CALL_CLIENT_RECV_REPLY; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 272 | else |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 273 | call->state = state = RXRPC_CALL_CLIENT_AWAIT_REPLY; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 274 | break; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 275 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 276 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
| 277 | __rxrpc_call_completed(call); |
| 278 | rxrpc_notify_socket(call); |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 279 | state = call->state; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 280 | break; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 281 | |
| 282 | default: |
| 283 | goto bad_state; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 284 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 285 | |
| 286 | write_unlock(&call->state_lock); |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 287 | if (state == RXRPC_CALL_CLIENT_AWAIT_REPLY) |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 288 | trace_rxrpc_transmit(call, rxrpc_transmit_await_reply); |
David Howells | dfe9952 | 2018-10-08 15:46:05 +0100 | [diff] [blame] | 289 | else |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 290 | trace_rxrpc_transmit(call, rxrpc_transmit_end); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 291 | _leave(" = ok"); |
| 292 | return true; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 293 | |
| 294 | bad_state: |
| 295 | write_unlock(&call->state_lock); |
| 296 | kdebug("end_tx %s", rxrpc_call_states[call->state]); |
| 297 | rxrpc_proto_abort(abort_why, call, call->tx_top); |
| 298 | return false; |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Begin the reply reception phase of a call. |
| 303 | */ |
| 304 | static bool rxrpc_receiving_reply(struct rxrpc_call *call) |
| 305 | { |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 306 | struct rxrpc_ack_summary summary = { 0 }; |
David Howells | a158bdd | 2017-11-24 10:18:41 +0000 | [diff] [blame] | 307 | unsigned long now, timo; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 308 | rxrpc_seq_t top = READ_ONCE(call->tx_top); |
| 309 | |
David Howells | dd7c1ee | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 310 | if (call->ackr_reason) { |
| 311 | spin_lock_bh(&call->lock); |
| 312 | call->ackr_reason = 0; |
David Howells | dd7c1ee | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 313 | spin_unlock_bh(&call->lock); |
David Howells | a158bdd | 2017-11-24 10:18:41 +0000 | [diff] [blame] | 314 | now = jiffies; |
| 315 | timo = now + MAX_JIFFY_OFFSET; |
| 316 | WRITE_ONCE(call->resend_at, timo); |
| 317 | WRITE_ONCE(call->ack_at, timo); |
| 318 | trace_rxrpc_timer(call, rxrpc_timer_init_for_reply, now); |
David Howells | dd7c1ee | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 319 | } |
| 320 | |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 321 | if (!test_bit(RXRPC_CALL_TX_LAST, &call->flags)) { |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 322 | if (!rxrpc_rotate_tx_window(call, top, &summary)) { |
| 323 | rxrpc_proto_abort("TXL", call, top); |
| 324 | return false; |
| 325 | } |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 326 | } |
| 327 | if (!rxrpc_end_tx_phase(call, true, "ETD")) |
| 328 | return false; |
| 329 | call->tx_phase = false; |
| 330 | return true; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 331 | } |
| 332 | |
| 333 | /* |
David Howells | c3c9e3d | 2019-08-19 09:25:37 +0100 | [diff] [blame] | 334 | * Scan a data packet to validate its structure and to work out how many |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 335 | * subpackets it contains. |
| 336 | * |
| 337 | * A jumbo packet is a collection of consecutive packets glued together with |
| 338 | * little headers between that indicate how to change the initial header for |
| 339 | * each subpacket. |
| 340 | * |
| 341 | * RXRPC_JUMBO_PACKET must be set on all but the last subpacket - and all but |
| 342 | * the last are RXRPC_JUMBO_DATALEN in size. The last subpacket may be of any |
| 343 | * size. |
| 344 | */ |
David Howells | c3c9e3d | 2019-08-19 09:25:37 +0100 | [diff] [blame] | 345 | static bool rxrpc_validate_data(struct sk_buff *skb) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 346 | { |
| 347 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | 775e5b7 | 2016-09-30 13:26:03 +0100 | [diff] [blame] | 348 | unsigned int offset = sizeof(struct rxrpc_wire_header); |
David Howells | 89a80ed | 2016-09-13 22:36:22 +0100 | [diff] [blame] | 349 | unsigned int len = skb->len; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 350 | u8 flags = sp->hdr.flags; |
| 351 | |
David Howells | c3c9e3d | 2019-08-19 09:25:37 +0100 | [diff] [blame] | 352 | for (;;) { |
| 353 | if (flags & RXRPC_REQUEST_ACK) |
| 354 | __set_bit(sp->nr_subpackets, sp->rx_req_ack); |
| 355 | sp->nr_subpackets++; |
| 356 | |
| 357 | if (!(flags & RXRPC_JUMBO_PACKET)) |
| 358 | break; |
| 359 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 360 | if (len - offset < RXRPC_JUMBO_SUBPKTLEN) |
| 361 | goto protocol_error; |
| 362 | if (flags & RXRPC_LAST_PACKET) |
| 363 | goto protocol_error; |
| 364 | offset += RXRPC_JUMBO_DATALEN; |
| 365 | if (skb_copy_bits(skb, offset, &flags, 1) < 0) |
| 366 | goto protocol_error; |
| 367 | offset += sizeof(struct rxrpc_jumbo_header); |
David Howells | c3c9e3d | 2019-08-19 09:25:37 +0100 | [diff] [blame] | 368 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 369 | |
David Howells | c3c9e3d | 2019-08-19 09:25:37 +0100 | [diff] [blame] | 370 | if (flags & RXRPC_LAST_PACKET) |
| 371 | sp->rx_flags |= RXRPC_SKB_INCL_LAST; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 372 | return true; |
| 373 | |
| 374 | protocol_error: |
| 375 | return false; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * Handle reception of a duplicate packet. |
| 380 | * |
| 381 | * We have to take care to avoid an attack here whereby we're given a series of |
| 382 | * jumbograms, each with a sequence number one before the preceding one and |
| 383 | * filled up to maximum UDP size. If they never send us the first packet in |
| 384 | * the sequence, they can cause us to have to hold on to around 2MiB of kernel |
| 385 | * space until the call times out. |
| 386 | * |
| 387 | * We limit the space usage by only accepting three duplicate jumbo packets per |
| 388 | * call. After that, we tell the other side we're no longer accepting jumbos |
| 389 | * (that information is encoded in the ACK packet). |
| 390 | */ |
| 391 | static void rxrpc_input_dup_data(struct rxrpc_call *call, rxrpc_seq_t seq, |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 392 | bool is_jumbo, bool *_jumbo_bad) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 393 | { |
| 394 | /* Discard normal packets that are duplicates. */ |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 395 | if (is_jumbo) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 396 | return; |
| 397 | |
| 398 | /* Skip jumbo subpackets that are duplicates. When we've had three or |
| 399 | * more partially duplicate jumbo packets, we refuse to take any more |
| 400 | * jumbos for this call. |
| 401 | */ |
David Howells | 75e4212 | 2016-09-13 22:36:22 +0100 | [diff] [blame] | 402 | if (!*_jumbo_bad) { |
| 403 | call->nr_jumbo_bad++; |
| 404 | *_jumbo_bad = true; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 405 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 406 | } |
| 407 | |
| 408 | /* |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 409 | * Process a DATA packet, adding the packet to the Rx ring. The caller's |
| 410 | * packet ref must be passed on or discarded. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 411 | */ |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 412 | static void rxrpc_input_data(struct rxrpc_call *call, struct sk_buff *skb) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 413 | { |
| 414 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | 146d8fe | 2017-03-04 00:01:41 +0000 | [diff] [blame] | 415 | enum rxrpc_call_state state; |
David Howells | 122d74f | 2020-01-24 23:08:04 +0000 | [diff] [blame] | 416 | unsigned int j, nr_subpackets; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 417 | rxrpc_serial_t serial = sp->hdr.serial, ack_serial = 0; |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 418 | rxrpc_seq_t seq0 = sp->hdr.seq, hard_ack; |
| 419 | bool immediate_ack = false, jumbo_bad = false; |
| 420 | u8 ack = 0; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 421 | |
| 422 | _enter("{%u,%u},{%u,%u}", |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 423 | call->rx_hard_ack, call->rx_top, skb->len, seq0); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 424 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 425 | _proto("Rx DATA %%%u { #%u f=%02x n=%u }", |
| 426 | sp->hdr.serial, seq0, sp->hdr.flags, sp->nr_subpackets); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 427 | |
David Howells | 146d8fe | 2017-03-04 00:01:41 +0000 | [diff] [blame] | 428 | state = READ_ONCE(call->state); |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 429 | if (state >= RXRPC_CALL_COMPLETE) { |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 430 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 431 | return; |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 432 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 433 | |
David Howells | a158bdd | 2017-11-24 10:18:41 +0000 | [diff] [blame] | 434 | if (call->state == RXRPC_CALL_SERVER_RECV_REQUEST) { |
| 435 | unsigned long timo = READ_ONCE(call->next_req_timo); |
| 436 | unsigned long now, expect_req_by; |
| 437 | |
| 438 | if (timo) { |
| 439 | now = jiffies; |
| 440 | expect_req_by = now + timo; |
| 441 | WRITE_ONCE(call->expect_req_by, expect_req_by); |
| 442 | rxrpc_reduce_call_timer(call, expect_req_by, now, |
| 443 | rxrpc_timer_set_for_idle); |
| 444 | } |
| 445 | } |
| 446 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 447 | spin_lock(&call->input_lock); |
| 448 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 449 | /* Received data implicitly ACKs all of the request packets we sent |
| 450 | * when we're acting as a client. |
| 451 | */ |
David Howells | 146d8fe | 2017-03-04 00:01:41 +0000 | [diff] [blame] | 452 | if ((state == RXRPC_CALL_CLIENT_SEND_REQUEST || |
| 453 | state == RXRPC_CALL_CLIENT_AWAIT_REPLY) && |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 454 | !rxrpc_receiving_reply(call)) |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 455 | goto unlock; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 456 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 457 | call->ackr_prev_seq = seq0; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 458 | hard_ack = READ_ONCE(call->rx_hard_ack); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 459 | |
David Howells | 122d74f | 2020-01-24 23:08:04 +0000 | [diff] [blame] | 460 | nr_subpackets = sp->nr_subpackets; |
| 461 | if (nr_subpackets > 1) { |
David Howells | 75e4212 | 2016-09-13 22:36:22 +0100 | [diff] [blame] | 462 | if (call->nr_jumbo_bad > 3) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 463 | ack = RXRPC_ACK_NOSPACE; |
| 464 | ack_serial = serial; |
| 465 | goto ack; |
| 466 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 467 | } |
| 468 | |
David Howells | 122d74f | 2020-01-24 23:08:04 +0000 | [diff] [blame] | 469 | for (j = 0; j < nr_subpackets; j++) { |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 470 | rxrpc_serial_t serial = sp->hdr.serial + j; |
| 471 | rxrpc_seq_t seq = seq0 + j; |
| 472 | unsigned int ix = seq & RXRPC_RXTX_BUFF_MASK; |
David Howells | 122d74f | 2020-01-24 23:08:04 +0000 | [diff] [blame] | 473 | bool terminal = (j == nr_subpackets - 1); |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 474 | bool last = terminal && (sp->rx_flags & RXRPC_SKB_INCL_LAST); |
| 475 | u8 flags, annotation = j; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 476 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 477 | _proto("Rx DATA+%u %%%u { #%x t=%u l=%u }", |
| 478 | j, serial, seq, terminal, last); |
| 479 | |
| 480 | if (last) { |
| 481 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
| 482 | seq != call->rx_top) { |
| 483 | rxrpc_proto_abort("LSN", call, seq); |
| 484 | goto unlock; |
| 485 | } |
| 486 | } else { |
| 487 | if (test_bit(RXRPC_CALL_RX_LAST, &call->flags) && |
| 488 | after_eq(seq, call->rx_top)) { |
| 489 | rxrpc_proto_abort("LSA", call, seq); |
| 490 | goto unlock; |
| 491 | } |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 492 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 493 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 494 | flags = 0; |
| 495 | if (last) |
| 496 | flags |= RXRPC_LAST_PACKET; |
| 497 | if (!terminal) |
| 498 | flags |= RXRPC_JUMBO_PACKET; |
| 499 | if (test_bit(j, sp->rx_req_ack)) |
| 500 | flags |= RXRPC_REQUEST_ACK; |
| 501 | trace_rxrpc_rx_data(call->debug_id, seq, serial, flags, annotation); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 502 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 503 | if (before_eq(seq, hard_ack)) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 504 | ack = RXRPC_ACK_DUPLICATE; |
| 505 | ack_serial = serial; |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 506 | continue; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 507 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 508 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 509 | if (call->rxtx_buffer[ix]) { |
David Howells | 122d74f | 2020-01-24 23:08:04 +0000 | [diff] [blame] | 510 | rxrpc_input_dup_data(call, seq, nr_subpackets > 1, |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 511 | &jumbo_bad); |
| 512 | if (ack != RXRPC_ACK_DUPLICATE) { |
| 513 | ack = RXRPC_ACK_DUPLICATE; |
| 514 | ack_serial = serial; |
| 515 | } |
| 516 | immediate_ack = true; |
| 517 | continue; |
David Howells | a7056c5 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 518 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 519 | |
David Howells | 75e4212 | 2016-09-13 22:36:22 +0100 | [diff] [blame] | 520 | if (after(seq, hard_ack + call->rx_winsize)) { |
| 521 | ack = RXRPC_ACK_EXCEEDS_WINDOW; |
| 522 | ack_serial = serial; |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 523 | if (flags & RXRPC_JUMBO_PACKET) { |
| 524 | if (!jumbo_bad) { |
| 525 | call->nr_jumbo_bad++; |
| 526 | jumbo_bad = true; |
| 527 | } |
David Howells | 75e4212 | 2016-09-13 22:36:22 +0100 | [diff] [blame] | 528 | } |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 529 | |
David Howells | 75e4212 | 2016-09-13 22:36:22 +0100 | [diff] [blame] | 530 | goto ack; |
| 531 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 532 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 533 | if (flags & RXRPC_REQUEST_ACK && !ack) { |
| 534 | ack = RXRPC_ACK_REQUESTED; |
| 535 | ack_serial = serial; |
| 536 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 537 | |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 538 | /* Queue the packet. We use a couple of memory barriers here as need |
| 539 | * to make sure that rx_top is perceived to be set after the buffer |
| 540 | * pointer and that the buffer pointer is set after the annotation and |
| 541 | * the skb data. |
| 542 | * |
| 543 | * Barriers against rxrpc_recvmsg_data() and rxrpc_rotate_rx_window() |
| 544 | * and also rxrpc_fill_out_ack(). |
| 545 | */ |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 546 | if (!terminal) |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 547 | rxrpc_get_skb(skb, rxrpc_skb_got); |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 548 | call->rxtx_annotations[ix] = annotation; |
| 549 | smp_wmb(); |
| 550 | call->rxtx_buffer[ix] = skb; |
| 551 | if (after(seq, call->rx_top)) { |
| 552 | smp_store_release(&call->rx_top, seq); |
| 553 | } else if (before(seq, call->rx_top)) { |
| 554 | /* Send an immediate ACK if we fill in a hole */ |
| 555 | if (!ack) { |
| 556 | ack = RXRPC_ACK_DELAY; |
| 557 | ack_serial = serial; |
| 558 | } |
| 559 | immediate_ack = true; |
| 560 | } |
| 561 | |
| 562 | if (terminal) { |
| 563 | /* From this point on, we're not allowed to touch the |
| 564 | * packet any longer as its ref now belongs to the Rx |
| 565 | * ring. |
| 566 | */ |
| 567 | skb = NULL; |
David Howells | 122d74f | 2020-01-24 23:08:04 +0000 | [diff] [blame] | 568 | sp = NULL; |
David Howells | e2de6c40 | 2019-08-27 09:51:30 +0100 | [diff] [blame] | 569 | } |
| 570 | |
| 571 | if (last) { |
| 572 | set_bit(RXRPC_CALL_RX_LAST, &call->flags); |
| 573 | if (!ack) { |
| 574 | ack = RXRPC_ACK_DELAY; |
| 575 | ack_serial = serial; |
| 576 | } |
| 577 | trace_rxrpc_receive(call, rxrpc_receive_queue_last, serial, seq); |
| 578 | } else { |
| 579 | trace_rxrpc_receive(call, rxrpc_receive_queue, serial, seq); |
| 580 | } |
| 581 | |
| 582 | if (after_eq(seq, call->rx_expect_next)) { |
| 583 | if (after(seq, call->rx_expect_next)) { |
| 584 | _net("OOS %u > %u", seq, call->rx_expect_next); |
| 585 | ack = RXRPC_ACK_OUT_OF_SEQUENCE; |
| 586 | ack_serial = serial; |
| 587 | } |
| 588 | call->rx_expect_next = seq + 1; |
| 589 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 590 | } |
| 591 | |
| 592 | ack: |
| 593 | if (ack) |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 594 | rxrpc_propose_ACK(call, ack, ack_serial, |
David Howells | 9c7ad43 | 2016-09-23 13:50:40 +0100 | [diff] [blame] | 595 | immediate_ack, true, |
| 596 | rxrpc_propose_ack_input_data); |
David Howells | 4764c0d | 2018-07-23 17:18:37 +0100 | [diff] [blame] | 597 | else |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 598 | rxrpc_propose_ACK(call, RXRPC_ACK_DELAY, serial, |
David Howells | 4764c0d | 2018-07-23 17:18:37 +0100 | [diff] [blame] | 599 | false, true, |
| 600 | rxrpc_propose_ack_input_data); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 601 | |
David Howells | f71dbf2 | 2020-01-30 21:50:36 +0000 | [diff] [blame^] | 602 | trace_rxrpc_notify_socket(call->debug_id, serial); |
| 603 | rxrpc_notify_socket(call); |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 604 | |
| 605 | unlock: |
| 606 | spin_unlock(&call->input_lock); |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 607 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 608 | _leave(" [queued]"); |
| 609 | } |
| 610 | |
| 611 | /* |
David Howells | 50235c4 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 612 | * Process a requested ACK. |
| 613 | */ |
| 614 | static void rxrpc_input_requested_ack(struct rxrpc_call *call, |
| 615 | ktime_t resp_time, |
| 616 | rxrpc_serial_t orig_serial, |
| 617 | rxrpc_serial_t ack_serial) |
| 618 | { |
| 619 | struct rxrpc_skb_priv *sp; |
| 620 | struct sk_buff *skb; |
| 621 | ktime_t sent_at; |
| 622 | int ix; |
| 623 | |
| 624 | for (ix = 0; ix < RXRPC_RXTX_BUFF_SIZE; ix++) { |
| 625 | skb = call->rxtx_buffer[ix]; |
| 626 | if (!skb) |
| 627 | continue; |
| 628 | |
David Howells | b604dd9 | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 629 | sent_at = skb->tstamp; |
| 630 | smp_rmb(); /* Read timestamp before serial. */ |
David Howells | 50235c4 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 631 | sp = rxrpc_skb(skb); |
| 632 | if (sp->hdr.serial != orig_serial) |
| 633 | continue; |
David Howells | 50235c4 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 634 | goto found; |
| 635 | } |
David Howells | b604dd9 | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 636 | |
David Howells | 50235c4 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 637 | return; |
| 638 | |
| 639 | found: |
| 640 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_requested_ack, |
| 641 | orig_serial, ack_serial, sent_at, resp_time); |
| 642 | } |
| 643 | |
| 644 | /* |
David Howells | bd1fdf8 | 2017-11-24 10:18:42 +0000 | [diff] [blame] | 645 | * Process the response to a ping that we sent to find out if we lost an ACK. |
| 646 | * |
| 647 | * If we got back a ping response that indicates a lower tx_top than what we |
| 648 | * had at the time of the ping transmission, we adjudge all the DATA packets |
| 649 | * sent between the response tx_top and the ping-time tx_top to have been lost. |
| 650 | */ |
| 651 | static void rxrpc_input_check_for_lost_ack(struct rxrpc_call *call) |
| 652 | { |
| 653 | rxrpc_seq_t top, bottom, seq; |
| 654 | bool resend = false; |
| 655 | |
| 656 | spin_lock_bh(&call->lock); |
| 657 | |
| 658 | bottom = call->tx_hard_ack + 1; |
| 659 | top = call->acks_lost_top; |
| 660 | if (before(bottom, top)) { |
| 661 | for (seq = bottom; before_eq(seq, top); seq++) { |
| 662 | int ix = seq & RXRPC_RXTX_BUFF_MASK; |
| 663 | u8 annotation = call->rxtx_annotations[ix]; |
| 664 | u8 anno_type = annotation & RXRPC_TX_ANNO_MASK; |
| 665 | |
| 666 | if (anno_type != RXRPC_TX_ANNO_UNACK) |
| 667 | continue; |
| 668 | annotation &= ~RXRPC_TX_ANNO_MASK; |
| 669 | annotation |= RXRPC_TX_ANNO_RETRANS; |
| 670 | call->rxtx_annotations[ix] = annotation; |
| 671 | resend = true; |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | spin_unlock_bh(&call->lock); |
| 676 | |
| 677 | if (resend && !test_and_set_bit(RXRPC_CALL_EV_RESEND, &call->events)) |
| 678 | rxrpc_queue_call(call); |
| 679 | } |
| 680 | |
| 681 | /* |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 682 | * Process a ping response. |
| 683 | */ |
| 684 | static void rxrpc_input_ping_response(struct rxrpc_call *call, |
| 685 | ktime_t resp_time, |
| 686 | rxrpc_serial_t orig_serial, |
| 687 | rxrpc_serial_t ack_serial) |
| 688 | { |
| 689 | rxrpc_serial_t ping_serial; |
| 690 | ktime_t ping_time; |
| 691 | |
David Howells | a5af7e1 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 692 | ping_time = call->ping_time; |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 693 | smp_rmb(); |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 694 | ping_serial = READ_ONCE(call->ping_serial); |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 695 | |
David Howells | bd1fdf8 | 2017-11-24 10:18:42 +0000 | [diff] [blame] | 696 | if (orig_serial == call->acks_lost_ping) |
| 697 | rxrpc_input_check_for_lost_ack(call); |
| 698 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 699 | if (before(orig_serial, ping_serial) || |
| 700 | !test_and_clear_bit(RXRPC_CALL_PINGING, &call->flags)) |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 701 | return; |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 702 | if (after(orig_serial, ping_serial)) |
| 703 | return; |
| 704 | |
| 705 | rxrpc_peer_add_rtt(call, rxrpc_rtt_rx_ping_response, |
| 706 | orig_serial, ack_serial, ping_time, resp_time); |
| 707 | } |
| 708 | |
| 709 | /* |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 710 | * Process the extra information that may be appended to an ACK packet |
| 711 | */ |
| 712 | static void rxrpc_input_ackinfo(struct rxrpc_call *call, struct sk_buff *skb, |
| 713 | struct rxrpc_ackinfo *ackinfo) |
| 714 | { |
| 715 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 716 | struct rxrpc_peer *peer; |
| 717 | unsigned int mtu; |
David Howells | 702f2ac | 2017-03-10 07:48:49 +0000 | [diff] [blame] | 718 | bool wake = false; |
David Howells | 01fd074 | 2016-09-13 10:23:01 +0100 | [diff] [blame] | 719 | u32 rwind = ntohl(ackinfo->rwind); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 720 | |
| 721 | _proto("Rx ACK %%%u Info { rx=%u max=%u rwin=%u jm=%u }", |
| 722 | sp->hdr.serial, |
| 723 | ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU), |
David Howells | 01fd074 | 2016-09-13 10:23:01 +0100 | [diff] [blame] | 724 | rwind, ntohl(ackinfo->jumbo_max)); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 725 | |
David Howells | 702f2ac | 2017-03-10 07:48:49 +0000 | [diff] [blame] | 726 | if (call->tx_winsize != rwind) { |
| 727 | if (rwind > RXRPC_RXTX_BUFF_SIZE - 1) |
| 728 | rwind = RXRPC_RXTX_BUFF_SIZE - 1; |
| 729 | if (rwind > call->tx_winsize) |
| 730 | wake = true; |
David Howells | 740586d | 2017-04-06 10:12:00 +0100 | [diff] [blame] | 731 | trace_rxrpc_rx_rwind_change(call, sp->hdr.serial, |
| 732 | ntohl(ackinfo->rwind), wake); |
David Howells | 702f2ac | 2017-03-10 07:48:49 +0000 | [diff] [blame] | 733 | call->tx_winsize = rwind; |
| 734 | } |
| 735 | |
David Howells | 0851115 | 2016-09-30 09:33:27 +0100 | [diff] [blame] | 736 | if (call->cong_ssthresh > rwind) |
| 737 | call->cong_ssthresh = rwind; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 738 | |
| 739 | mtu = min(ntohl(ackinfo->rxMTU), ntohl(ackinfo->maxMTU)); |
| 740 | |
| 741 | peer = call->peer; |
| 742 | if (mtu < peer->maxdata) { |
| 743 | spin_lock_bh(&peer->lock); |
| 744 | peer->maxdata = mtu; |
| 745 | peer->mtu = mtu + peer->hdrsize; |
| 746 | spin_unlock_bh(&peer->lock); |
| 747 | _net("Net MTU %u (maxdata %u)", peer->mtu, peer->maxdata); |
| 748 | } |
David Howells | 702f2ac | 2017-03-10 07:48:49 +0000 | [diff] [blame] | 749 | |
| 750 | if (wake) |
| 751 | wake_up(&call->waitq); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 752 | } |
| 753 | |
| 754 | /* |
| 755 | * Process individual soft ACKs. |
| 756 | * |
| 757 | * Each ACK in the array corresponds to one packet and can be either an ACK or |
| 758 | * a NAK. If we get find an explicitly NAK'd packet we resend immediately; |
| 759 | * packets that lie beyond the end of the ACK list are scheduled for resend by |
| 760 | * the timer on the basis that the peer might just not have processed them at |
| 761 | * the time the ACK was sent. |
| 762 | */ |
| 763 | static void rxrpc_input_soft_acks(struct rxrpc_call *call, u8 *acks, |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 764 | rxrpc_seq_t seq, int nr_acks, |
| 765 | struct rxrpc_ack_summary *summary) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 766 | { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 767 | int ix; |
David Howells | f07373e | 2016-09-22 00:29:32 +0100 | [diff] [blame] | 768 | u8 annotation, anno_type; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 769 | |
| 770 | for (; nr_acks > 0; nr_acks--, seq++) { |
| 771 | ix = seq & RXRPC_RXTX_BUFF_MASK; |
David Howells | f07373e | 2016-09-22 00:29:32 +0100 | [diff] [blame] | 772 | annotation = call->rxtx_annotations[ix]; |
| 773 | anno_type = annotation & RXRPC_TX_ANNO_MASK; |
| 774 | annotation &= ~RXRPC_TX_ANNO_MASK; |
David Howells | d01dc4c | 2016-09-17 10:49:12 +0100 | [diff] [blame] | 775 | switch (*acks++) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 776 | case RXRPC_ACK_TYPE_ACK: |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 777 | summary->nr_acks++; |
David Howells | f07373e | 2016-09-22 00:29:32 +0100 | [diff] [blame] | 778 | if (anno_type == RXRPC_TX_ANNO_ACK) |
| 779 | continue; |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 780 | summary->nr_new_acks++; |
David Howells | f07373e | 2016-09-22 00:29:32 +0100 | [diff] [blame] | 781 | call->rxtx_annotations[ix] = |
| 782 | RXRPC_TX_ANNO_ACK | annotation; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 783 | break; |
| 784 | case RXRPC_ACK_TYPE_NACK: |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 785 | if (!summary->nr_nacks && |
| 786 | call->acks_lowest_nak != seq) { |
| 787 | call->acks_lowest_nak = seq; |
| 788 | summary->new_low_nack = true; |
| 789 | } |
| 790 | summary->nr_nacks++; |
David Howells | f07373e | 2016-09-22 00:29:32 +0100 | [diff] [blame] | 791 | if (anno_type == RXRPC_TX_ANNO_NAK) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 792 | continue; |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 793 | summary->nr_new_nacks++; |
David Howells | be8aa33 | 2016-09-23 12:39:23 +0100 | [diff] [blame] | 794 | if (anno_type == RXRPC_TX_ANNO_RETRANS) |
| 795 | continue; |
David Howells | f07373e | 2016-09-22 00:29:32 +0100 | [diff] [blame] | 796 | call->rxtx_annotations[ix] = |
| 797 | RXRPC_TX_ANNO_NAK | annotation; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 798 | break; |
| 799 | default: |
| 800 | return rxrpc_proto_abort("SFT", call, 0); |
| 801 | } |
| 802 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 803 | } |
| 804 | |
| 805 | /* |
| 806 | * Process an ACK packet. |
| 807 | * |
| 808 | * ack.firstPacket is the sequence number of the first soft-ACK'd/NAK'd packet |
| 809 | * in the ACK array. Anything before that is hard-ACK'd and may be discarded. |
| 810 | * |
| 811 | * A hard-ACK means that a packet has been processed and may be discarded; a |
| 812 | * soft-ACK means that the packet may be discarded and retransmission |
| 813 | * requested. A phase is complete when all packets are hard-ACK'd. |
| 814 | */ |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 815 | static void rxrpc_input_ack(struct rxrpc_call *call, struct sk_buff *skb) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 816 | { |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 817 | struct rxrpc_ack_summary summary = { 0 }; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 818 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 819 | union { |
| 820 | struct rxrpc_ackpacket ack; |
| 821 | struct rxrpc_ackinfo info; |
| 822 | u8 acks[RXRPC_MAXACKS]; |
| 823 | } buf; |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 824 | rxrpc_serial_t acked_serial; |
Jeffrey Altman | 1a2391c | 2019-04-12 16:34:16 +0100 | [diff] [blame] | 825 | rxrpc_seq_t first_soft_ack, hard_ack, prev_pkt; |
David Howells | 775e5b7 | 2016-09-30 13:26:03 +0100 | [diff] [blame] | 826 | int nr_acks, offset, ioffset; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 827 | |
| 828 | _enter(""); |
| 829 | |
David Howells | 775e5b7 | 2016-09-30 13:26:03 +0100 | [diff] [blame] | 830 | offset = sizeof(struct rxrpc_wire_header); |
| 831 | if (skb_copy_bits(skb, offset, &buf.ack, sizeof(buf.ack)) < 0) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 832 | _debug("extraction failure"); |
| 833 | return rxrpc_proto_abort("XAK", call, 0); |
| 834 | } |
David Howells | 775e5b7 | 2016-09-30 13:26:03 +0100 | [diff] [blame] | 835 | offset += sizeof(buf.ack); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 836 | |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 837 | acked_serial = ntohl(buf.ack.serial); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 838 | first_soft_ack = ntohl(buf.ack.firstPacket); |
Jeffrey Altman | 1a2391c | 2019-04-12 16:34:16 +0100 | [diff] [blame] | 839 | prev_pkt = ntohl(buf.ack.previousPacket); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 840 | hard_ack = first_soft_ack - 1; |
| 841 | nr_acks = buf.ack.nAcks; |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 842 | summary.ack_reason = (buf.ack.reason < RXRPC_ACK__INVALID ? |
| 843 | buf.ack.reason : RXRPC_ACK__INVALID); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 844 | |
David Howells | b1d9f7fd | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 845 | trace_rxrpc_rx_ack(call, sp->hdr.serial, acked_serial, |
Jeffrey Altman | 1a2391c | 2019-04-12 16:34:16 +0100 | [diff] [blame] | 846 | first_soft_ack, prev_pkt, |
David Howells | b1d9f7fd | 2017-01-05 10:38:34 +0000 | [diff] [blame] | 847 | summary.ack_reason, nr_acks); |
David Howells | ec71eb9 | 2016-09-17 10:49:13 +0100 | [diff] [blame] | 848 | |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 849 | if (buf.ack.reason == RXRPC_ACK_PING_RESPONSE) |
| 850 | rxrpc_input_ping_response(call, skb->tstamp, acked_serial, |
| 851 | sp->hdr.serial); |
David Howells | 50235c4 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 852 | if (buf.ack.reason == RXRPC_ACK_REQUESTED) |
| 853 | rxrpc_input_requested_ack(call, skb->tstamp, acked_serial, |
| 854 | sp->hdr.serial); |
David Howells | 8e83134 | 2016-09-22 00:29:31 +0100 | [diff] [blame] | 855 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 856 | if (buf.ack.reason == RXRPC_ACK_PING) { |
| 857 | _proto("Rx ACK %%%u PING Request", sp->hdr.serial); |
| 858 | rxrpc_propose_ACK(call, RXRPC_ACK_PING_RESPONSE, |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 859 | sp->hdr.serial, true, true, |
David Howells | 9c7ad43 | 2016-09-23 13:50:40 +0100 | [diff] [blame] | 860 | rxrpc_propose_ack_respond_to_ping); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 861 | } else if (sp->hdr.flags & RXRPC_REQUEST_ACK) { |
| 862 | rxrpc_propose_ACK(call, RXRPC_ACK_REQUESTED, |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 863 | sp->hdr.serial, true, true, |
David Howells | 9c7ad43 | 2016-09-23 13:50:40 +0100 | [diff] [blame] | 864 | rxrpc_propose_ack_respond_to_ack); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 865 | } |
| 866 | |
Jeffrey Altman | 1a2391c | 2019-04-12 16:34:16 +0100 | [diff] [blame] | 867 | /* Discard any out-of-order or duplicate ACKs (outside lock). */ |
| 868 | if (before(first_soft_ack, call->ackr_first_seq) || |
| 869 | before(prev_pkt, call->ackr_prev_seq)) |
David Howells | 298bc15 | 2018-10-08 15:46:11 +0100 | [diff] [blame] | 870 | return; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 871 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 872 | buf.info.rxMTU = 0; |
| 873 | ioffset = offset + nr_acks + 3; |
| 874 | if (skb->len >= ioffset + sizeof(buf.info) && |
| 875 | skb_copy_bits(skb, ioffset, &buf.info, sizeof(buf.info)) < 0) |
| 876 | return rxrpc_proto_abort("XAI", call, 0); |
| 877 | |
| 878 | spin_lock(&call->input_lock); |
| 879 | |
Jeffrey Altman | 1a2391c | 2019-04-12 16:34:16 +0100 | [diff] [blame] | 880 | /* Discard any out-of-order or duplicate ACKs (inside lock). */ |
| 881 | if (before(first_soft_ack, call->ackr_first_seq) || |
| 882 | before(prev_pkt, call->ackr_prev_seq)) |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 883 | goto out; |
David Howells | 298bc15 | 2018-10-08 15:46:11 +0100 | [diff] [blame] | 884 | call->acks_latest_ts = skb->tstamp; |
| 885 | call->acks_latest = sp->hdr.serial; |
| 886 | |
Jeffrey Altman | 1a2391c | 2019-04-12 16:34:16 +0100 | [diff] [blame] | 887 | call->ackr_first_seq = first_soft_ack; |
| 888 | call->ackr_prev_seq = prev_pkt; |
| 889 | |
David Howells | 298bc15 | 2018-10-08 15:46:11 +0100 | [diff] [blame] | 890 | /* Parse rwind and mtu sizes if provided. */ |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 891 | if (buf.info.rxMTU) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 892 | rxrpc_input_ackinfo(call, skb, &buf.info); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 893 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 894 | if (first_soft_ack == 0) { |
| 895 | rxrpc_proto_abort("AK0", call, 0); |
| 896 | goto out; |
| 897 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 898 | |
| 899 | /* Ignore ACKs unless we are or have just been transmitting. */ |
David Howells | 146d8fe | 2017-03-04 00:01:41 +0000 | [diff] [blame] | 900 | switch (READ_ONCE(call->state)) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 901 | case RXRPC_CALL_CLIENT_SEND_REQUEST: |
| 902 | case RXRPC_CALL_CLIENT_AWAIT_REPLY: |
| 903 | case RXRPC_CALL_SERVER_SEND_REPLY: |
| 904 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
| 905 | break; |
| 906 | default: |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 907 | goto out; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 908 | } |
| 909 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 910 | if (before(hard_ack, call->tx_hard_ack) || |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 911 | after(hard_ack, call->tx_top)) { |
| 912 | rxrpc_proto_abort("AKW", call, 0); |
| 913 | goto out; |
| 914 | } |
| 915 | if (nr_acks > call->tx_top - hard_ack) { |
| 916 | rxrpc_proto_abort("AKN", call, 0); |
| 917 | goto out; |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 918 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 919 | |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 920 | if (after(hard_ack, call->tx_hard_ack)) { |
| 921 | if (rxrpc_rotate_tx_window(call, hard_ack, &summary)) { |
| 922 | rxrpc_end_tx_phase(call, false, "ETA"); |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 923 | goto out; |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 924 | } |
| 925 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 926 | |
| 927 | if (nr_acks > 0) { |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 928 | if (skb_copy_bits(skb, offset, buf.acks, nr_acks) < 0) { |
| 929 | rxrpc_proto_abort("XSA", call, 0); |
| 930 | goto out; |
| 931 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 932 | rxrpc_input_soft_acks(call, buf.acks, first_soft_ack, nr_acks, |
| 933 | &summary); |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 934 | } |
| 935 | |
David Howells | 0d96796 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 936 | if (call->rxtx_annotations[call->tx_top & RXRPC_RXTX_BUFF_MASK] & |
| 937 | RXRPC_TX_ANNO_LAST && |
David Howells | a9f312d | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 938 | summary.nr_acks == call->tx_top - hard_ack && |
| 939 | rxrpc_is_client_call(call)) |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 940 | rxrpc_propose_ACK(call, RXRPC_ACK_PING, sp->hdr.serial, |
David Howells | 0d96796 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 941 | false, true, |
| 942 | rxrpc_propose_ack_ping_for_lost_reply); |
David Howells | 5749434 | 2016-09-24 18:05:27 +0100 | [diff] [blame] | 943 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 944 | rxrpc_congestion_management(call, skb, &summary, acked_serial); |
| 945 | out: |
| 946 | spin_unlock(&call->input_lock); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 947 | } |
| 948 | |
| 949 | /* |
| 950 | * Process an ACKALL packet. |
| 951 | */ |
| 952 | static void rxrpc_input_ackall(struct rxrpc_call *call, struct sk_buff *skb) |
| 953 | { |
David Howells | 31a1b989 | 2016-09-24 18:05:26 +0100 | [diff] [blame] | 954 | struct rxrpc_ack_summary summary = { 0 }; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 955 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
| 956 | |
| 957 | _proto("Rx ACKALL %%%u", sp->hdr.serial); |
| 958 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 959 | spin_lock(&call->input_lock); |
| 960 | |
David Howells | c479d5f | 2018-10-08 15:46:01 +0100 | [diff] [blame] | 961 | if (rxrpc_rotate_tx_window(call, call->tx_top, &summary)) |
David Howells | 70790dbe | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 962 | rxrpc_end_tx_phase(call, false, "ETL"); |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 963 | |
| 964 | spin_unlock(&call->input_lock); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 965 | } |
| 966 | |
| 967 | /* |
David Howells | 005ede2 | 2017-04-06 10:12:00 +0100 | [diff] [blame] | 968 | * Process an ABORT packet directed at a call. |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 969 | */ |
| 970 | static void rxrpc_input_abort(struct rxrpc_call *call, struct sk_buff *skb) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 971 | { |
| 972 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 973 | __be32 wtmp; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 974 | u32 abort_code = RX_CALL_DEAD; |
| 975 | |
| 976 | _enter(""); |
| 977 | |
| 978 | if (skb->len >= 4 && |
David Howells | 775e5b7 | 2016-09-30 13:26:03 +0100 | [diff] [blame] | 979 | skb_copy_bits(skb, sizeof(struct rxrpc_wire_header), |
| 980 | &wtmp, sizeof(wtmp)) >= 0) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 981 | abort_code = ntohl(wtmp); |
| 982 | |
David Howells | 005ede2 | 2017-04-06 10:12:00 +0100 | [diff] [blame] | 983 | trace_rxrpc_rx_abort(call, sp->hdr.serial, abort_code); |
| 984 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 985 | _proto("Rx ABORT %%%u { %x }", sp->hdr.serial, abort_code); |
| 986 | |
| 987 | if (rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED, |
David Howells | 3a92789 | 2017-04-06 10:11:56 +0100 | [diff] [blame] | 988 | abort_code, -ECONNABORTED)) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 989 | rxrpc_notify_socket(call); |
| 990 | } |
| 991 | |
| 992 | /* |
| 993 | * Process an incoming call packet. |
| 994 | */ |
| 995 | static void rxrpc_input_call_packet(struct rxrpc_call *call, |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 996 | struct sk_buff *skb) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 997 | { |
| 998 | struct rxrpc_skb_priv *sp = rxrpc_skb(skb); |
David Howells | a158bdd | 2017-11-24 10:18:41 +0000 | [diff] [blame] | 999 | unsigned long timo; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1000 | |
| 1001 | _enter("%p,%p", call, skb); |
| 1002 | |
David Howells | a158bdd | 2017-11-24 10:18:41 +0000 | [diff] [blame] | 1003 | timo = READ_ONCE(call->next_rx_timo); |
| 1004 | if (timo) { |
| 1005 | unsigned long now = jiffies, expect_rx_by; |
| 1006 | |
David Howells | c54e43d | 2018-05-10 23:26:00 +0100 | [diff] [blame] | 1007 | expect_rx_by = now + timo; |
David Howells | a158bdd | 2017-11-24 10:18:41 +0000 | [diff] [blame] | 1008 | WRITE_ONCE(call->expect_rx_by, expect_rx_by); |
| 1009 | rxrpc_reduce_call_timer(call, expect_rx_by, now, |
| 1010 | rxrpc_timer_set_for_normal); |
| 1011 | } |
David Howells | 3d7682a | 2017-11-29 14:25:50 +0000 | [diff] [blame] | 1012 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1013 | switch (sp->hdr.type) { |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1014 | case RXRPC_PACKET_TYPE_DATA: |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1015 | rxrpc_input_data(call, skb); |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 1016 | goto no_free; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1017 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1018 | case RXRPC_PACKET_TYPE_ACK: |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1019 | rxrpc_input_ack(call, skb); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1020 | break; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1021 | |
| 1022 | case RXRPC_PACKET_TYPE_BUSY: |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 1023 | _proto("Rx BUSY %%%u", sp->hdr.serial); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1024 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1025 | /* Just ignore BUSY packets from the server; the retry and |
| 1026 | * lifespan timers will take care of business. BUSY packets |
| 1027 | * from the client don't make sense. |
| 1028 | */ |
| 1029 | break; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1030 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1031 | case RXRPC_PACKET_TYPE_ABORT: |
| 1032 | rxrpc_input_abort(call, skb); |
| 1033 | break; |
| 1034 | |
| 1035 | case RXRPC_PACKET_TYPE_ACKALL: |
| 1036 | rxrpc_input_ackall(call, skb); |
| 1037 | break; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1038 | |
| 1039 | default: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1040 | break; |
| 1041 | } |
| 1042 | |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 1043 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 1044 | no_free: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1045 | _leave(""); |
| 1046 | } |
| 1047 | |
| 1048 | /* |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1049 | * Handle a new service call on a channel implicitly completing the preceding |
| 1050 | * call on that channel. This does not apply to client conns. |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1051 | * |
| 1052 | * TODO: If callNumber > call_id + 1, renegotiate security. |
| 1053 | */ |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1054 | static void rxrpc_input_implicit_end_call(struct rxrpc_sock *rx, |
| 1055 | struct rxrpc_connection *conn, |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1056 | struct rxrpc_call *call) |
| 1057 | { |
David Howells | 146d8fe | 2017-03-04 00:01:41 +0000 | [diff] [blame] | 1058 | switch (READ_ONCE(call->state)) { |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1059 | case RXRPC_CALL_SERVER_AWAIT_ACK: |
| 1060 | rxrpc_call_completed(call); |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1061 | /* Fall through */ |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1062 | case RXRPC_CALL_COMPLETE: |
| 1063 | break; |
| 1064 | default: |
David Howells | 3a92789 | 2017-04-06 10:11:56 +0100 | [diff] [blame] | 1065 | if (rxrpc_abort_call("IMP", call, 0, RX_CALL_DEAD, -ESHUTDOWN)) { |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1066 | set_bit(RXRPC_CALL_EV_ABORT, &call->events); |
| 1067 | rxrpc_queue_call(call); |
| 1068 | } |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1069 | trace_rxrpc_improper_term(call); |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1070 | break; |
| 1071 | } |
| 1072 | |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1073 | spin_lock(&rx->incoming_lock); |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1074 | __rxrpc_disconnect_call(conn, call); |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1075 | spin_unlock(&rx->incoming_lock); |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1076 | rxrpc_notify_socket(call); |
| 1077 | } |
| 1078 | |
| 1079 | /* |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1080 | * post connection-level events to the connection |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1081 | * - this includes challenges, responses, some aborts and call terminal packet |
| 1082 | * retransmission. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1083 | */ |
David Howells | 2e7e975 | 2016-08-09 10:11:48 +0100 | [diff] [blame] | 1084 | static void rxrpc_post_packet_to_conn(struct rxrpc_connection *conn, |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1085 | struct sk_buff *skb) |
| 1086 | { |
| 1087 | _enter("%p,%p", conn, skb); |
| 1088 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1089 | skb_queue_tail(&conn->rx_queue, skb); |
David Howells | 2e7e975 | 2016-08-09 10:11:48 +0100 | [diff] [blame] | 1090 | rxrpc_queue_conn(conn); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1091 | } |
| 1092 | |
David Howells | 44ba069 | 2015-04-01 16:31:26 +0100 | [diff] [blame] | 1093 | /* |
| 1094 | * post endpoint-level events to the local endpoint |
| 1095 | * - this includes debug and version messages |
| 1096 | */ |
| 1097 | static void rxrpc_post_packet_to_local(struct rxrpc_local *local, |
| 1098 | struct sk_buff *skb) |
| 1099 | { |
| 1100 | _enter("%p,%p", local, skb); |
| 1101 | |
David Howells | 730c5fd | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1102 | if (rxrpc_get_local_maybe(local)) { |
| 1103 | skb_queue_tail(&local->event_queue, skb); |
| 1104 | rxrpc_queue_local(local); |
| 1105 | } else { |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 1106 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 730c5fd | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1107 | } |
David Howells | 44ba069 | 2015-04-01 16:31:26 +0100 | [diff] [blame] | 1108 | } |
| 1109 | |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 1110 | /* |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1111 | * put a packet up for transport-level abort |
| 1112 | */ |
| 1113 | static void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb) |
| 1114 | { |
| 1115 | CHECK_SLAB_OKAY(&local->usage); |
| 1116 | |
David Howells | 730c5fd | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1117 | if (rxrpc_get_local_maybe(local)) { |
| 1118 | skb_queue_tail(&local->reject_queue, skb); |
| 1119 | rxrpc_queue_local(local); |
| 1120 | } else { |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 1121 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 730c5fd | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1122 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1123 | } |
| 1124 | |
| 1125 | /* |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 1126 | * Extract the wire header from a packet and translate the byte order. |
| 1127 | */ |
| 1128 | static noinline |
| 1129 | int rxrpc_extract_header(struct rxrpc_skb_priv *sp, struct sk_buff *skb) |
| 1130 | { |
| 1131 | struct rxrpc_wire_header whdr; |
| 1132 | |
| 1133 | /* dig out the RxRPC connection details */ |
David Howells | fb46f6e | 2017-04-06 10:12:00 +0100 | [diff] [blame] | 1134 | if (skb_copy_bits(skb, 0, &whdr, sizeof(whdr)) < 0) { |
| 1135 | trace_rxrpc_rx_eproto(NULL, sp->hdr.serial, |
| 1136 | tracepoint_string("bad_hdr")); |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 1137 | return -EBADMSG; |
David Howells | fb46f6e | 2017-04-06 10:12:00 +0100 | [diff] [blame] | 1138 | } |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 1139 | |
| 1140 | memset(sp, 0, sizeof(*sp)); |
| 1141 | sp->hdr.epoch = ntohl(whdr.epoch); |
| 1142 | sp->hdr.cid = ntohl(whdr.cid); |
| 1143 | sp->hdr.callNumber = ntohl(whdr.callNumber); |
| 1144 | sp->hdr.seq = ntohl(whdr.seq); |
| 1145 | sp->hdr.serial = ntohl(whdr.serial); |
| 1146 | sp->hdr.flags = whdr.flags; |
| 1147 | sp->hdr.type = whdr.type; |
| 1148 | sp->hdr.userStatus = whdr.userStatus; |
| 1149 | sp->hdr.securityIndex = whdr.securityIndex; |
| 1150 | sp->hdr._rsvd = ntohs(whdr._rsvd); |
| 1151 | sp->hdr.serviceId = ntohs(whdr.serviceId); |
| 1152 | return 0; |
| 1153 | } |
| 1154 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1155 | /* |
| 1156 | * handle data received on the local endpoint |
| 1157 | * - may be called in interrupt context |
David Howells | 4f95dd7 | 2016-04-04 14:00:35 +0100 | [diff] [blame] | 1158 | * |
Eric Dumazet | 032be5f | 2019-04-24 09:44:11 -0700 | [diff] [blame] | 1159 | * [!] Note that as this is called from the encap_rcv hook, the socket is not |
| 1160 | * held locked by the caller and nothing prevents sk_user_data on the UDP from |
| 1161 | * being cleared in the middle of processing this function. |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1162 | * |
| 1163 | * Called with the RCU read lock held from the IP layer via UDP. |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1164 | */ |
David Howells | 5271953 | 2018-10-04 11:10:51 +0100 | [diff] [blame] | 1165 | int rxrpc_input_packet(struct sock *udp_sk, struct sk_buff *skb) |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1166 | { |
Eric Dumazet | 032be5f | 2019-04-24 09:44:11 -0700 | [diff] [blame] | 1167 | struct rxrpc_local *local = rcu_dereference_sk_user_data(udp_sk); |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 1168 | struct rxrpc_connection *conn; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1169 | struct rxrpc_channel *chan; |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1170 | struct rxrpc_call *call = NULL; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1171 | struct rxrpc_skb_priv *sp; |
David Howells | 0099dc5 | 2018-09-27 15:13:09 +0100 | [diff] [blame] | 1172 | struct rxrpc_peer *peer = NULL; |
| 1173 | struct rxrpc_sock *rx = NULL; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1174 | unsigned int channel; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1175 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1176 | _enter("%p", udp_sk); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1177 | |
Eric Dumazet | 032be5f | 2019-04-24 09:44:11 -0700 | [diff] [blame] | 1178 | if (unlikely(!local)) { |
| 1179 | kfree_skb(skb); |
| 1180 | return 0; |
| 1181 | } |
David Howells | b604dd9 | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1182 | if (skb->tstamp == 0) |
| 1183 | skb->tstamp = ktime_get_real(); |
| 1184 | |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 1185 | rxrpc_new_skb(skb, rxrpc_skb_received); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1186 | |
David Howells | 5271953 | 2018-10-04 11:10:51 +0100 | [diff] [blame] | 1187 | skb_pull(skb, sizeof(struct udphdr)); |
Herbert Xu | 1781f7f | 2007-12-11 11:30:32 -0800 | [diff] [blame] | 1188 | |
Paolo Abeni | 7c13f97 | 2016-11-04 11:28:59 +0100 | [diff] [blame] | 1189 | /* The UDP protocol already released all skb resources; |
| 1190 | * we are free to add our own data there. |
David Howells | 0d12f8a | 2016-03-04 15:53:46 +0000 | [diff] [blame] | 1191 | */ |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1192 | sp = rxrpc_skb(skb); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1193 | |
David Howells | 89b475a | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 1194 | /* dig out the RxRPC connection details */ |
| 1195 | if (rxrpc_extract_header(sp, skb) < 0) |
| 1196 | goto bad_message; |
| 1197 | |
David Howells | 8a681c36 | 2016-09-17 10:49:15 +0100 | [diff] [blame] | 1198 | if (IS_ENABLED(CONFIG_AF_RXRPC_INJECT_LOSS)) { |
| 1199 | static int lose; |
| 1200 | if ((lose++ & 7) == 7) { |
David Howells | 89b475a | 2016-09-23 12:39:22 +0100 | [diff] [blame] | 1201 | trace_rxrpc_rx_lose(sp); |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 1202 | rxrpc_free_skb(skb, rxrpc_skb_lost); |
David Howells | 5271953 | 2018-10-04 11:10:51 +0100 | [diff] [blame] | 1203 | return 0; |
David Howells | 8a681c36 | 2016-09-17 10:49:15 +0100 | [diff] [blame] | 1204 | } |
| 1205 | } |
| 1206 | |
David Howells | 2cfa227 | 2018-10-05 14:05:35 +0100 | [diff] [blame] | 1207 | if (skb->tstamp == 0) |
| 1208 | skb->tstamp = ktime_get_real(); |
David Howells | 49e19ec | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1209 | trace_rxrpc_rx_packet(sp); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1210 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1211 | switch (sp->hdr.type) { |
| 1212 | case RXRPC_PACKET_TYPE_VERSION: |
David Howells | dc71db3 | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1213 | if (rxrpc_to_client(sp)) |
David Howells | ace45be | 2018-03-30 21:04:43 +0100 | [diff] [blame] | 1214 | goto discard; |
David Howells | 44ba069 | 2015-04-01 16:31:26 +0100 | [diff] [blame] | 1215 | rxrpc_post_packet_to_local(local, skb); |
| 1216 | goto out; |
David Howells | bc6e1ea | 2016-06-10 22:30:27 +0100 | [diff] [blame] | 1217 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1218 | case RXRPC_PACKET_TYPE_BUSY: |
David Howells | dc71db3 | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1219 | if (rxrpc_to_server(sp)) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1220 | goto discard; |
Gustavo A. R. Silva | e3cf3970 | 2017-10-19 16:54:48 -0500 | [diff] [blame] | 1221 | /* Fall through */ |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1222 | case RXRPC_PACKET_TYPE_ACK: |
| 1223 | case RXRPC_PACKET_TYPE_ACKALL: |
| 1224 | if (sp->hdr.callNumber == 0) |
| 1225 | goto bad_message; |
| 1226 | /* Fall through */ |
| 1227 | case RXRPC_PACKET_TYPE_ABORT: |
| 1228 | break; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1229 | |
| 1230 | case RXRPC_PACKET_TYPE_DATA: |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1231 | if (sp->hdr.callNumber == 0 || |
| 1232 | sp->hdr.seq == 0) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1233 | goto bad_message; |
David Howells | c3c9e3d | 2019-08-19 09:25:37 +0100 | [diff] [blame] | 1234 | if (!rxrpc_validate_data(skb)) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1235 | goto bad_message; |
David Howells | d0d5c0c | 2019-08-27 10:13:46 +0100 | [diff] [blame] | 1236 | |
| 1237 | /* Unshare the packet so that it can be modified for in-place |
| 1238 | * decryption. |
| 1239 | */ |
| 1240 | if (sp->hdr.securityIndex != 0) { |
| 1241 | struct sk_buff *nskb = skb_unshare(skb, GFP_ATOMIC); |
| 1242 | if (!nskb) { |
| 1243 | rxrpc_eaten_skb(skb, rxrpc_skb_unshared_nomem); |
| 1244 | goto out; |
| 1245 | } |
| 1246 | |
| 1247 | if (nskb != skb) { |
| 1248 | rxrpc_eaten_skb(skb, rxrpc_skb_received); |
David Howells | d0d5c0c | 2019-08-27 10:13:46 +0100 | [diff] [blame] | 1249 | skb = nskb; |
David Howells | 5913289 | 2019-09-02 11:34:08 +0100 | [diff] [blame] | 1250 | rxrpc_new_skb(skb, rxrpc_skb_unshared); |
David Howells | d0d5c0c | 2019-08-27 10:13:46 +0100 | [diff] [blame] | 1251 | sp = rxrpc_skb(skb); |
| 1252 | } |
| 1253 | } |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1254 | break; |
David Howells | b41d7cf | 2018-04-02 23:51:39 +0100 | [diff] [blame] | 1255 | |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1256 | case RXRPC_PACKET_TYPE_CHALLENGE: |
| 1257 | if (rxrpc_to_server(sp)) |
| 1258 | goto discard; |
| 1259 | break; |
| 1260 | case RXRPC_PACKET_TYPE_RESPONSE: |
| 1261 | if (rxrpc_to_client(sp)) |
| 1262 | goto discard; |
| 1263 | break; |
| 1264 | |
David Howells | b41d7cf | 2018-04-02 23:51:39 +0100 | [diff] [blame] | 1265 | /* Packet types 9-11 should just be ignored. */ |
| 1266 | case RXRPC_PACKET_TYPE_PARAMS: |
| 1267 | case RXRPC_PACKET_TYPE_10: |
| 1268 | case RXRPC_PACKET_TYPE_11: |
| 1269 | goto discard; |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1270 | |
| 1271 | default: |
| 1272 | _proto("Rx Bad Packet Type %u", sp->hdr.type); |
| 1273 | goto bad_message; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1274 | } |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1275 | |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1276 | if (sp->hdr.serviceId == 0) |
| 1277 | goto bad_message; |
| 1278 | |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1279 | if (rxrpc_to_server(sp)) { |
| 1280 | /* Weed out packets to services we're not offering. Packets |
| 1281 | * that would begin a call are explicitly rejected and the rest |
| 1282 | * are just discarded. |
| 1283 | */ |
| 1284 | rx = rcu_dereference(local->service); |
| 1285 | if (!rx || (sp->hdr.serviceId != rx->srx.srx_service && |
| 1286 | sp->hdr.serviceId != rx->second_service)) { |
| 1287 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA && |
| 1288 | sp->hdr.seq == 1) |
| 1289 | goto unsupported_service; |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1290 | goto discard; |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1291 | } |
| 1292 | } |
| 1293 | |
David Howells | 0099dc5 | 2018-09-27 15:13:09 +0100 | [diff] [blame] | 1294 | conn = rxrpc_find_connection_rcu(local, skb, &peer); |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1295 | if (conn) { |
| 1296 | if (sp->hdr.securityIndex != conn->security_ix) |
| 1297 | goto wrong_security; |
David Howells | 563ea7d | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1298 | |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1299 | if (sp->hdr.serviceId != conn->service_id) { |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1300 | int old_id; |
| 1301 | |
| 1302 | if (!test_bit(RXRPC_CONN_PROBING_FOR_UPGRADE, &conn->flags)) |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1303 | goto reupgrade; |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1304 | old_id = cmpxchg(&conn->service_id, conn->params.service_id, |
| 1305 | sp->hdr.serviceId); |
| 1306 | |
| 1307 | if (old_id != conn->params.service_id && |
| 1308 | old_id != sp->hdr.serviceId) |
| 1309 | goto reupgrade; |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1310 | } |
David Howells | 3d7682a | 2017-11-29 14:25:50 +0000 | [diff] [blame] | 1311 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1312 | if (sp->hdr.callNumber == 0) { |
| 1313 | /* Connection-level packet */ |
| 1314 | _debug("CONN %p {%d}", conn, conn->debug_id); |
| 1315 | rxrpc_post_packet_to_conn(conn, skb); |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1316 | goto out; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1317 | } |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 1318 | |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1319 | if ((int)sp->hdr.serial - (int)conn->hi_serial > 0) |
| 1320 | conn->hi_serial = sp->hdr.serial; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1321 | |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 1322 | /* Call-bound packets are routed by connection channel. */ |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1323 | channel = sp->hdr.cid & RXRPC_CHANNELMASK; |
| 1324 | chan = &conn->channels[channel]; |
Tim Smith | 7727640 | 2014-03-03 23:04:45 +0000 | [diff] [blame] | 1325 | |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1326 | /* Ignore really old calls */ |
| 1327 | if (sp->hdr.callNumber < chan->last_call) |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1328 | goto discard; |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1329 | |
| 1330 | if (sp->hdr.callNumber == chan->last_call) { |
David Howells | 57b0c9d | 2018-03-30 21:04:44 +0100 | [diff] [blame] | 1331 | if (chan->call || |
| 1332 | sp->hdr.type == RXRPC_PACKET_TYPE_ABORT) |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1333 | goto discard; |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1334 | |
David Howells | 57b0c9d | 2018-03-30 21:04:44 +0100 | [diff] [blame] | 1335 | /* For the previous service call, if completed |
| 1336 | * successfully, we discard all further packets. |
| 1337 | */ |
| 1338 | if (rxrpc_conn_is_service(conn) && |
| 1339 | chan->last_type == RXRPC_PACKET_TYPE_ACK) |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1340 | goto discard; |
David Howells | 57b0c9d | 2018-03-30 21:04:44 +0100 | [diff] [blame] | 1341 | |
| 1342 | /* But otherwise we need to retransmit the final packet |
| 1343 | * from data cached in the connection record. |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1344 | */ |
David Howells | 4764c0d | 2018-07-23 17:18:37 +0100 | [diff] [blame] | 1345 | if (sp->hdr.type == RXRPC_PACKET_TYPE_DATA) |
| 1346 | trace_rxrpc_rx_data(chan->call_debug_id, |
| 1347 | sp->hdr.seq, |
| 1348 | sp->hdr.serial, |
| 1349 | sp->hdr.flags, 0); |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1350 | rxrpc_post_packet_to_conn(conn, skb); |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1351 | goto out; |
David Howells | 18bfeba | 2016-08-23 15:27:25 +0100 | [diff] [blame] | 1352 | } |
| 1353 | |
| 1354 | call = rcu_dereference(chan->call); |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1355 | |
| 1356 | if (sp->hdr.callNumber > chan->call_id) { |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1357 | if (rxrpc_to_client(sp)) |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1358 | goto reject_packet; |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1359 | if (call) |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1360 | rxrpc_input_implicit_end_call(rx, conn, call); |
David Howells | b3156274 | 2016-10-06 08:11:49 +0100 | [diff] [blame] | 1361 | call = NULL; |
| 1362 | } |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1363 | |
David Howells | 1a02502 | 2018-06-03 02:17:39 +0100 | [diff] [blame] | 1364 | if (call) { |
| 1365 | if (sp->hdr.serviceId != call->service_id) |
| 1366 | call->service_id = sp->hdr.serviceId; |
| 1367 | if ((int)sp->hdr.serial - (int)call->rx_serial > 0) |
| 1368 | call->rx_serial = sp->hdr.serial; |
| 1369 | if (!test_bit(RXRPC_CALL_RX_HEARD, &call->flags)) |
| 1370 | set_bit(RXRPC_CALL_RX_HEARD, &call->flags); |
| 1371 | } |
Tim Smith | 7727640 | 2014-03-03 23:04:45 +0000 | [diff] [blame] | 1372 | } |
David Howells | 44ba069 | 2015-04-01 16:31:26 +0100 | [diff] [blame] | 1373 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1374 | if (!call || atomic_read(&call->usage) == 0) { |
David Howells | dc71db3 | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1375 | if (rxrpc_to_client(sp) || |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1376 | sp->hdr.type != RXRPC_PACKET_TYPE_DATA) |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1377 | goto bad_message; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1378 | if (sp->hdr.seq != 1) |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1379 | goto discard; |
David Howells | c1e15b4 | 2018-10-08 15:46:25 +0100 | [diff] [blame] | 1380 | call = rxrpc_new_incoming_call(local, rx, skb); |
David Howells | bfd2821 | 2018-10-08 15:45:56 +0100 | [diff] [blame] | 1381 | if (!call) |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1382 | goto reject_packet; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1383 | } |
| 1384 | |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 1385 | /* Process a call packet; this either discards or passes on the ref |
| 1386 | * elsewhere. |
| 1387 | */ |
David Howells | e8c3af6 | 2019-08-09 15:20:41 +0100 | [diff] [blame] | 1388 | rxrpc_input_call_packet(call, skb); |
David Howells | 4858e40 | 2019-08-19 09:25:36 +0100 | [diff] [blame] | 1389 | goto out; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1390 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1391 | discard: |
David Howells | 987db9f | 2019-08-19 09:25:38 +0100 | [diff] [blame] | 1392 | rxrpc_free_skb(skb, rxrpc_skb_freed); |
David Howells | 44ba069 | 2015-04-01 16:31:26 +0100 | [diff] [blame] | 1393 | out: |
David Howells | 49e19ec | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1394 | trace_rxrpc_rx_done(0, 0); |
David Howells | 5271953 | 2018-10-04 11:10:51 +0100 | [diff] [blame] | 1395 | return 0; |
David Howells | 8496af5 | 2016-07-01 07:51:50 +0100 | [diff] [blame] | 1396 | |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1397 | wrong_security: |
David Howells | a25e21f | 2018-03-27 23:03:00 +0100 | [diff] [blame] | 1398 | trace_rxrpc_abort(0, "SEC", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1399 | RXKADINCONSISTENCY, EBADMSG); |
| 1400 | skb->priority = RXKADINCONSISTENCY; |
| 1401 | goto post_abort; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1402 | |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1403 | unsupported_service: |
David Howells | 403fc2a | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1404 | trace_rxrpc_abort(0, "INV", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
| 1405 | RX_INVALID_OPERATION, EOPNOTSUPP); |
| 1406 | skb->priority = RX_INVALID_OPERATION; |
| 1407 | goto post_abort; |
| 1408 | |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1409 | reupgrade: |
David Howells | a25e21f | 2018-03-27 23:03:00 +0100 | [diff] [blame] | 1410 | trace_rxrpc_abort(0, "UPG", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1411 | RX_PROTOCOL_ERROR, EBADMSG); |
| 1412 | goto protocol_error; |
| 1413 | |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1414 | bad_message: |
David Howells | a25e21f | 2018-03-27 23:03:00 +0100 | [diff] [blame] | 1415 | trace_rxrpc_abort(0, "BAD", sp->hdr.cid, sp->hdr.callNumber, sp->hdr.seq, |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1416 | RX_PROTOCOL_ERROR, EBADMSG); |
David Howells | 4e25572 | 2017-06-05 14:30:49 +0100 | [diff] [blame] | 1417 | protocol_error: |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1418 | skb->priority = RX_PROTOCOL_ERROR; |
David Howells | 248f219 | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1419 | post_abort: |
David Howells | ece64fe | 2018-09-27 15:13:08 +0100 | [diff] [blame] | 1420 | skb->mark = RXRPC_SKB_MARK_REJECT_ABORT; |
David Howells | 49e19ec | 2016-09-08 11:10:12 +0100 | [diff] [blame] | 1421 | reject_packet: |
| 1422 | trace_rxrpc_rx_done(skb->mark, skb->priority); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1423 | rxrpc_reject_packet(local, skb); |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1424 | _leave(" [badmsg]"); |
David Howells | 5271953 | 2018-10-04 11:10:51 +0100 | [diff] [blame] | 1425 | return 0; |
David Howells | 17926a7 | 2007-04-26 15:48:28 -0700 | [diff] [blame] | 1426 | } |