Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 1 | /* |
| 2 | * common code for virtio vsock |
| 3 | * |
| 4 | * Copyright (C) 2013-2015 Red Hat, Inc. |
| 5 | * Author: Asias He <asias@redhat.com> |
| 6 | * Stefan Hajnoczi <stefanha@redhat.com> |
| 7 | * |
| 8 | * This work is licensed under the terms of the GNU GPL, version 2. |
| 9 | */ |
| 10 | #include <linux/spinlock.h> |
| 11 | #include <linux/module.h> |
Ingo Molnar | 174cd4b | 2017-02-02 19:15:33 +0100 | [diff] [blame] | 12 | #include <linux/sched/signal.h> |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 13 | #include <linux/ctype.h> |
| 14 | #include <linux/list.h> |
| 15 | #include <linux/virtio.h> |
| 16 | #include <linux/virtio_ids.h> |
| 17 | #include <linux/virtio_config.h> |
| 18 | #include <linux/virtio_vsock.h> |
Gerard Garcia | 82dfb54 | 2017-04-21 10:10:46 +0100 | [diff] [blame] | 19 | #include <uapi/linux/vsockmon.h> |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 20 | |
| 21 | #include <net/sock.h> |
| 22 | #include <net/af_vsock.h> |
| 23 | |
| 24 | #define CREATE_TRACE_POINTS |
| 25 | #include <trace/events/vsock_virtio_transport_common.h> |
| 26 | |
| 27 | /* How long to wait for graceful shutdown of a connection */ |
| 28 | #define VSOCK_CLOSE_TIMEOUT (8 * HZ) |
| 29 | |
| 30 | static const struct virtio_transport *virtio_transport_get_ops(void) |
| 31 | { |
| 32 | const struct vsock_transport *t = vsock_core_get_transport(); |
| 33 | |
| 34 | return container_of(t, struct virtio_transport, transport); |
| 35 | } |
| 36 | |
Michael S. Tsirkin | 819483d | 2016-12-06 06:06:06 +0200 | [diff] [blame] | 37 | static struct virtio_vsock_pkt * |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 38 | virtio_transport_alloc_pkt(struct virtio_vsock_pkt_info *info, |
| 39 | size_t len, |
| 40 | u32 src_cid, |
| 41 | u32 src_port, |
| 42 | u32 dst_cid, |
| 43 | u32 dst_port) |
| 44 | { |
| 45 | struct virtio_vsock_pkt *pkt; |
| 46 | int err; |
| 47 | |
| 48 | pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); |
| 49 | if (!pkt) |
| 50 | return NULL; |
| 51 | |
| 52 | pkt->hdr.type = cpu_to_le16(info->type); |
| 53 | pkt->hdr.op = cpu_to_le16(info->op); |
| 54 | pkt->hdr.src_cid = cpu_to_le64(src_cid); |
| 55 | pkt->hdr.dst_cid = cpu_to_le64(dst_cid); |
| 56 | pkt->hdr.src_port = cpu_to_le32(src_port); |
| 57 | pkt->hdr.dst_port = cpu_to_le32(dst_port); |
| 58 | pkt->hdr.flags = cpu_to_le32(info->flags); |
| 59 | pkt->len = len; |
| 60 | pkt->hdr.len = cpu_to_le32(len); |
| 61 | pkt->reply = info->reply; |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 62 | pkt->vsk = info->vsk; |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 63 | |
| 64 | if (info->msg && len > 0) { |
| 65 | pkt->buf = kmalloc(len, GFP_KERNEL); |
| 66 | if (!pkt->buf) |
| 67 | goto out_pkt; |
| 68 | err = memcpy_from_msg(pkt->buf, info->msg, len); |
| 69 | if (err) |
| 70 | goto out; |
| 71 | } |
| 72 | |
| 73 | trace_virtio_transport_alloc_pkt(src_cid, src_port, |
| 74 | dst_cid, dst_port, |
| 75 | len, |
| 76 | info->type, |
| 77 | info->op, |
| 78 | info->flags); |
| 79 | |
| 80 | return pkt; |
| 81 | |
| 82 | out: |
| 83 | kfree(pkt->buf); |
| 84 | out_pkt: |
| 85 | kfree(pkt); |
| 86 | return NULL; |
| 87 | } |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 88 | |
Gerard Garcia | 82dfb54 | 2017-04-21 10:10:46 +0100 | [diff] [blame] | 89 | /* Packet capture */ |
| 90 | static struct sk_buff *virtio_transport_build_skb(void *opaque) |
| 91 | { |
| 92 | struct virtio_vsock_pkt *pkt = opaque; |
Gerard Garcia | 82dfb54 | 2017-04-21 10:10:46 +0100 | [diff] [blame] | 93 | struct af_vsockmon_hdr *hdr; |
| 94 | struct sk_buff *skb; |
| 95 | |
| 96 | skb = alloc_skb(sizeof(*hdr) + sizeof(pkt->hdr) + pkt->len, |
| 97 | GFP_ATOMIC); |
| 98 | if (!skb) |
| 99 | return NULL; |
| 100 | |
Johannes Berg | 4df864c | 2017-06-16 14:29:21 +0200 | [diff] [blame] | 101 | hdr = skb_put(skb, sizeof(*hdr)); |
Gerard Garcia | 82dfb54 | 2017-04-21 10:10:46 +0100 | [diff] [blame] | 102 | |
| 103 | /* pkt->hdr is little-endian so no need to byteswap here */ |
| 104 | hdr->src_cid = pkt->hdr.src_cid; |
| 105 | hdr->src_port = pkt->hdr.src_port; |
| 106 | hdr->dst_cid = pkt->hdr.dst_cid; |
| 107 | hdr->dst_port = pkt->hdr.dst_port; |
| 108 | |
| 109 | hdr->transport = cpu_to_le16(AF_VSOCK_TRANSPORT_VIRTIO); |
| 110 | hdr->len = cpu_to_le16(sizeof(pkt->hdr)); |
| 111 | memset(hdr->reserved, 0, sizeof(hdr->reserved)); |
| 112 | |
| 113 | switch (le16_to_cpu(pkt->hdr.op)) { |
| 114 | case VIRTIO_VSOCK_OP_REQUEST: |
| 115 | case VIRTIO_VSOCK_OP_RESPONSE: |
| 116 | hdr->op = cpu_to_le16(AF_VSOCK_OP_CONNECT); |
| 117 | break; |
| 118 | case VIRTIO_VSOCK_OP_RST: |
| 119 | case VIRTIO_VSOCK_OP_SHUTDOWN: |
| 120 | hdr->op = cpu_to_le16(AF_VSOCK_OP_DISCONNECT); |
| 121 | break; |
| 122 | case VIRTIO_VSOCK_OP_RW: |
| 123 | hdr->op = cpu_to_le16(AF_VSOCK_OP_PAYLOAD); |
| 124 | break; |
| 125 | case VIRTIO_VSOCK_OP_CREDIT_UPDATE: |
| 126 | case VIRTIO_VSOCK_OP_CREDIT_REQUEST: |
| 127 | hdr->op = cpu_to_le16(AF_VSOCK_OP_CONTROL); |
| 128 | break; |
| 129 | default: |
| 130 | hdr->op = cpu_to_le16(AF_VSOCK_OP_UNKNOWN); |
| 131 | break; |
| 132 | } |
| 133 | |
yuan linyu | b952f4d | 2017-06-18 22:52:04 +0800 | [diff] [blame] | 134 | skb_put_data(skb, &pkt->hdr, sizeof(pkt->hdr)); |
Gerard Garcia | 82dfb54 | 2017-04-21 10:10:46 +0100 | [diff] [blame] | 135 | |
| 136 | if (pkt->len) { |
yuan linyu | b952f4d | 2017-06-18 22:52:04 +0800 | [diff] [blame] | 137 | skb_put_data(skb, pkt->buf, pkt->len); |
Gerard Garcia | 82dfb54 | 2017-04-21 10:10:46 +0100 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | return skb; |
| 141 | } |
| 142 | |
| 143 | void virtio_transport_deliver_tap_pkt(struct virtio_vsock_pkt *pkt) |
| 144 | { |
| 145 | vsock_deliver_tap(virtio_transport_build_skb, pkt); |
| 146 | } |
| 147 | EXPORT_SYMBOL_GPL(virtio_transport_deliver_tap_pkt); |
| 148 | |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 149 | static int virtio_transport_send_pkt_info(struct vsock_sock *vsk, |
| 150 | struct virtio_vsock_pkt_info *info) |
| 151 | { |
| 152 | u32 src_cid, src_port, dst_cid, dst_port; |
| 153 | struct virtio_vsock_sock *vvs; |
| 154 | struct virtio_vsock_pkt *pkt; |
| 155 | u32 pkt_len = info->pkt_len; |
| 156 | |
| 157 | src_cid = vm_sockets_get_local_cid(); |
| 158 | src_port = vsk->local_addr.svm_port; |
| 159 | if (!info->remote_cid) { |
| 160 | dst_cid = vsk->remote_addr.svm_cid; |
| 161 | dst_port = vsk->remote_addr.svm_port; |
| 162 | } else { |
| 163 | dst_cid = info->remote_cid; |
| 164 | dst_port = info->remote_port; |
| 165 | } |
| 166 | |
| 167 | vvs = vsk->trans; |
| 168 | |
| 169 | /* we can send less than pkt_len bytes */ |
| 170 | if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE) |
| 171 | pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; |
| 172 | |
| 173 | /* virtio_transport_get_credit might return less than pkt_len credit */ |
| 174 | pkt_len = virtio_transport_get_credit(vvs, pkt_len); |
| 175 | |
| 176 | /* Do not send zero length OP_RW pkt */ |
| 177 | if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW) |
| 178 | return pkt_len; |
| 179 | |
| 180 | pkt = virtio_transport_alloc_pkt(info, pkt_len, |
| 181 | src_cid, src_port, |
| 182 | dst_cid, dst_port); |
| 183 | if (!pkt) { |
| 184 | virtio_transport_put_credit(vvs, pkt_len); |
| 185 | return -ENOMEM; |
| 186 | } |
| 187 | |
| 188 | virtio_transport_inc_tx_pkt(vvs, pkt); |
| 189 | |
| 190 | return virtio_transport_get_ops()->send_pkt(pkt); |
| 191 | } |
| 192 | |
| 193 | static void virtio_transport_inc_rx_pkt(struct virtio_vsock_sock *vvs, |
| 194 | struct virtio_vsock_pkt *pkt) |
| 195 | { |
| 196 | vvs->rx_bytes += pkt->len; |
| 197 | } |
| 198 | |
| 199 | static void virtio_transport_dec_rx_pkt(struct virtio_vsock_sock *vvs, |
| 200 | struct virtio_vsock_pkt *pkt) |
| 201 | { |
| 202 | vvs->rx_bytes -= pkt->len; |
| 203 | vvs->fwd_cnt += pkt->len; |
| 204 | } |
| 205 | |
| 206 | void virtio_transport_inc_tx_pkt(struct virtio_vsock_sock *vvs, struct virtio_vsock_pkt *pkt) |
| 207 | { |
| 208 | spin_lock_bh(&vvs->tx_lock); |
| 209 | pkt->hdr.fwd_cnt = cpu_to_le32(vvs->fwd_cnt); |
| 210 | pkt->hdr.buf_alloc = cpu_to_le32(vvs->buf_alloc); |
| 211 | spin_unlock_bh(&vvs->tx_lock); |
| 212 | } |
| 213 | EXPORT_SYMBOL_GPL(virtio_transport_inc_tx_pkt); |
| 214 | |
| 215 | u32 virtio_transport_get_credit(struct virtio_vsock_sock *vvs, u32 credit) |
| 216 | { |
| 217 | u32 ret; |
| 218 | |
| 219 | spin_lock_bh(&vvs->tx_lock); |
| 220 | ret = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); |
| 221 | if (ret > credit) |
| 222 | ret = credit; |
| 223 | vvs->tx_cnt += ret; |
| 224 | spin_unlock_bh(&vvs->tx_lock); |
| 225 | |
| 226 | return ret; |
| 227 | } |
| 228 | EXPORT_SYMBOL_GPL(virtio_transport_get_credit); |
| 229 | |
| 230 | void virtio_transport_put_credit(struct virtio_vsock_sock *vvs, u32 credit) |
| 231 | { |
| 232 | spin_lock_bh(&vvs->tx_lock); |
| 233 | vvs->tx_cnt -= credit; |
| 234 | spin_unlock_bh(&vvs->tx_lock); |
| 235 | } |
| 236 | EXPORT_SYMBOL_GPL(virtio_transport_put_credit); |
| 237 | |
| 238 | static int virtio_transport_send_credit_update(struct vsock_sock *vsk, |
| 239 | int type, |
| 240 | struct virtio_vsock_hdr *hdr) |
| 241 | { |
| 242 | struct virtio_vsock_pkt_info info = { |
| 243 | .op = VIRTIO_VSOCK_OP_CREDIT_UPDATE, |
| 244 | .type = type, |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 245 | .vsk = vsk, |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 246 | }; |
| 247 | |
| 248 | return virtio_transport_send_pkt_info(vsk, &info); |
| 249 | } |
| 250 | |
| 251 | static ssize_t |
| 252 | virtio_transport_stream_do_dequeue(struct vsock_sock *vsk, |
| 253 | struct msghdr *msg, |
| 254 | size_t len) |
| 255 | { |
| 256 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 257 | struct virtio_vsock_pkt *pkt; |
| 258 | size_t bytes, total = 0; |
| 259 | int err = -EFAULT; |
| 260 | |
| 261 | spin_lock_bh(&vvs->rx_lock); |
| 262 | while (total < len && !list_empty(&vvs->rx_queue)) { |
| 263 | pkt = list_first_entry(&vvs->rx_queue, |
| 264 | struct virtio_vsock_pkt, list); |
| 265 | |
| 266 | bytes = len - total; |
| 267 | if (bytes > pkt->len - pkt->off) |
| 268 | bytes = pkt->len - pkt->off; |
| 269 | |
| 270 | /* sk_lock is held by caller so no one else can dequeue. |
| 271 | * Unlock rx_lock since memcpy_to_msg() may sleep. |
| 272 | */ |
| 273 | spin_unlock_bh(&vvs->rx_lock); |
| 274 | |
| 275 | err = memcpy_to_msg(msg, pkt->buf + pkt->off, bytes); |
| 276 | if (err) |
| 277 | goto out; |
| 278 | |
| 279 | spin_lock_bh(&vvs->rx_lock); |
| 280 | |
| 281 | total += bytes; |
| 282 | pkt->off += bytes; |
| 283 | if (pkt->off == pkt->len) { |
| 284 | virtio_transport_dec_rx_pkt(vvs, pkt); |
| 285 | list_del(&pkt->list); |
| 286 | virtio_transport_free_pkt(pkt); |
| 287 | } |
| 288 | } |
| 289 | spin_unlock_bh(&vvs->rx_lock); |
| 290 | |
| 291 | /* Send a credit pkt to peer */ |
| 292 | virtio_transport_send_credit_update(vsk, VIRTIO_VSOCK_TYPE_STREAM, |
| 293 | NULL); |
| 294 | |
| 295 | return total; |
| 296 | |
| 297 | out: |
| 298 | if (total) |
| 299 | err = total; |
| 300 | return err; |
| 301 | } |
| 302 | |
| 303 | ssize_t |
| 304 | virtio_transport_stream_dequeue(struct vsock_sock *vsk, |
| 305 | struct msghdr *msg, |
| 306 | size_t len, int flags) |
| 307 | { |
| 308 | if (flags & MSG_PEEK) |
| 309 | return -EOPNOTSUPP; |
| 310 | |
| 311 | return virtio_transport_stream_do_dequeue(vsk, msg, len); |
| 312 | } |
| 313 | EXPORT_SYMBOL_GPL(virtio_transport_stream_dequeue); |
| 314 | |
| 315 | int |
| 316 | virtio_transport_dgram_dequeue(struct vsock_sock *vsk, |
| 317 | struct msghdr *msg, |
| 318 | size_t len, int flags) |
| 319 | { |
| 320 | return -EOPNOTSUPP; |
| 321 | } |
| 322 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_dequeue); |
| 323 | |
| 324 | s64 virtio_transport_stream_has_data(struct vsock_sock *vsk) |
| 325 | { |
| 326 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 327 | s64 bytes; |
| 328 | |
| 329 | spin_lock_bh(&vvs->rx_lock); |
| 330 | bytes = vvs->rx_bytes; |
| 331 | spin_unlock_bh(&vvs->rx_lock); |
| 332 | |
| 333 | return bytes; |
| 334 | } |
| 335 | EXPORT_SYMBOL_GPL(virtio_transport_stream_has_data); |
| 336 | |
| 337 | static s64 virtio_transport_has_space(struct vsock_sock *vsk) |
| 338 | { |
| 339 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 340 | s64 bytes; |
| 341 | |
| 342 | bytes = vvs->peer_buf_alloc - (vvs->tx_cnt - vvs->peer_fwd_cnt); |
| 343 | if (bytes < 0) |
| 344 | bytes = 0; |
| 345 | |
| 346 | return bytes; |
| 347 | } |
| 348 | |
| 349 | s64 virtio_transport_stream_has_space(struct vsock_sock *vsk) |
| 350 | { |
| 351 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 352 | s64 bytes; |
| 353 | |
| 354 | spin_lock_bh(&vvs->tx_lock); |
| 355 | bytes = virtio_transport_has_space(vsk); |
| 356 | spin_unlock_bh(&vvs->tx_lock); |
| 357 | |
| 358 | return bytes; |
| 359 | } |
| 360 | EXPORT_SYMBOL_GPL(virtio_transport_stream_has_space); |
| 361 | |
| 362 | int virtio_transport_do_socket_init(struct vsock_sock *vsk, |
| 363 | struct vsock_sock *psk) |
| 364 | { |
| 365 | struct virtio_vsock_sock *vvs; |
| 366 | |
| 367 | vvs = kzalloc(sizeof(*vvs), GFP_KERNEL); |
| 368 | if (!vvs) |
| 369 | return -ENOMEM; |
| 370 | |
| 371 | vsk->trans = vvs; |
| 372 | vvs->vsk = vsk; |
| 373 | if (psk) { |
| 374 | struct virtio_vsock_sock *ptrans = psk->trans; |
| 375 | |
| 376 | vvs->buf_size = ptrans->buf_size; |
| 377 | vvs->buf_size_min = ptrans->buf_size_min; |
| 378 | vvs->buf_size_max = ptrans->buf_size_max; |
| 379 | vvs->peer_buf_alloc = ptrans->peer_buf_alloc; |
| 380 | } else { |
| 381 | vvs->buf_size = VIRTIO_VSOCK_DEFAULT_BUF_SIZE; |
| 382 | vvs->buf_size_min = VIRTIO_VSOCK_DEFAULT_MIN_BUF_SIZE; |
| 383 | vvs->buf_size_max = VIRTIO_VSOCK_DEFAULT_MAX_BUF_SIZE; |
| 384 | } |
| 385 | |
| 386 | vvs->buf_alloc = vvs->buf_size; |
| 387 | |
| 388 | spin_lock_init(&vvs->rx_lock); |
| 389 | spin_lock_init(&vvs->tx_lock); |
| 390 | INIT_LIST_HEAD(&vvs->rx_queue); |
| 391 | |
| 392 | return 0; |
| 393 | } |
| 394 | EXPORT_SYMBOL_GPL(virtio_transport_do_socket_init); |
| 395 | |
| 396 | u64 virtio_transport_get_buffer_size(struct vsock_sock *vsk) |
| 397 | { |
| 398 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 399 | |
| 400 | return vvs->buf_size; |
| 401 | } |
| 402 | EXPORT_SYMBOL_GPL(virtio_transport_get_buffer_size); |
| 403 | |
| 404 | u64 virtio_transport_get_min_buffer_size(struct vsock_sock *vsk) |
| 405 | { |
| 406 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 407 | |
| 408 | return vvs->buf_size_min; |
| 409 | } |
| 410 | EXPORT_SYMBOL_GPL(virtio_transport_get_min_buffer_size); |
| 411 | |
| 412 | u64 virtio_transport_get_max_buffer_size(struct vsock_sock *vsk) |
| 413 | { |
| 414 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 415 | |
| 416 | return vvs->buf_size_max; |
| 417 | } |
| 418 | EXPORT_SYMBOL_GPL(virtio_transport_get_max_buffer_size); |
| 419 | |
| 420 | void virtio_transport_set_buffer_size(struct vsock_sock *vsk, u64 val) |
| 421 | { |
| 422 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 423 | |
| 424 | if (val > VIRTIO_VSOCK_MAX_BUF_SIZE) |
| 425 | val = VIRTIO_VSOCK_MAX_BUF_SIZE; |
| 426 | if (val < vvs->buf_size_min) |
| 427 | vvs->buf_size_min = val; |
| 428 | if (val > vvs->buf_size_max) |
| 429 | vvs->buf_size_max = val; |
| 430 | vvs->buf_size = val; |
| 431 | vvs->buf_alloc = val; |
| 432 | } |
| 433 | EXPORT_SYMBOL_GPL(virtio_transport_set_buffer_size); |
| 434 | |
| 435 | void virtio_transport_set_min_buffer_size(struct vsock_sock *vsk, u64 val) |
| 436 | { |
| 437 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 438 | |
| 439 | if (val > VIRTIO_VSOCK_MAX_BUF_SIZE) |
| 440 | val = VIRTIO_VSOCK_MAX_BUF_SIZE; |
| 441 | if (val > vvs->buf_size) |
| 442 | vvs->buf_size = val; |
| 443 | vvs->buf_size_min = val; |
| 444 | } |
| 445 | EXPORT_SYMBOL_GPL(virtio_transport_set_min_buffer_size); |
| 446 | |
| 447 | void virtio_transport_set_max_buffer_size(struct vsock_sock *vsk, u64 val) |
| 448 | { |
| 449 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 450 | |
| 451 | if (val > VIRTIO_VSOCK_MAX_BUF_SIZE) |
| 452 | val = VIRTIO_VSOCK_MAX_BUF_SIZE; |
| 453 | if (val < vvs->buf_size) |
| 454 | vvs->buf_size = val; |
| 455 | vvs->buf_size_max = val; |
| 456 | } |
| 457 | EXPORT_SYMBOL_GPL(virtio_transport_set_max_buffer_size); |
| 458 | |
| 459 | int |
| 460 | virtio_transport_notify_poll_in(struct vsock_sock *vsk, |
| 461 | size_t target, |
| 462 | bool *data_ready_now) |
| 463 | { |
| 464 | if (vsock_stream_has_data(vsk)) |
| 465 | *data_ready_now = true; |
| 466 | else |
| 467 | *data_ready_now = false; |
| 468 | |
| 469 | return 0; |
| 470 | } |
| 471 | EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_in); |
| 472 | |
| 473 | int |
| 474 | virtio_transport_notify_poll_out(struct vsock_sock *vsk, |
| 475 | size_t target, |
| 476 | bool *space_avail_now) |
| 477 | { |
| 478 | s64 free_space; |
| 479 | |
| 480 | free_space = vsock_stream_has_space(vsk); |
| 481 | if (free_space > 0) |
| 482 | *space_avail_now = true; |
| 483 | else if (free_space == 0) |
| 484 | *space_avail_now = false; |
| 485 | |
| 486 | return 0; |
| 487 | } |
| 488 | EXPORT_SYMBOL_GPL(virtio_transport_notify_poll_out); |
| 489 | |
| 490 | int virtio_transport_notify_recv_init(struct vsock_sock *vsk, |
| 491 | size_t target, struct vsock_transport_recv_notify_data *data) |
| 492 | { |
| 493 | return 0; |
| 494 | } |
| 495 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_init); |
| 496 | |
| 497 | int virtio_transport_notify_recv_pre_block(struct vsock_sock *vsk, |
| 498 | size_t target, struct vsock_transport_recv_notify_data *data) |
| 499 | { |
| 500 | return 0; |
| 501 | } |
| 502 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_block); |
| 503 | |
| 504 | int virtio_transport_notify_recv_pre_dequeue(struct vsock_sock *vsk, |
| 505 | size_t target, struct vsock_transport_recv_notify_data *data) |
| 506 | { |
| 507 | return 0; |
| 508 | } |
| 509 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_pre_dequeue); |
| 510 | |
| 511 | int virtio_transport_notify_recv_post_dequeue(struct vsock_sock *vsk, |
| 512 | size_t target, ssize_t copied, bool data_read, |
| 513 | struct vsock_transport_recv_notify_data *data) |
| 514 | { |
| 515 | return 0; |
| 516 | } |
| 517 | EXPORT_SYMBOL_GPL(virtio_transport_notify_recv_post_dequeue); |
| 518 | |
| 519 | int virtio_transport_notify_send_init(struct vsock_sock *vsk, |
| 520 | struct vsock_transport_send_notify_data *data) |
| 521 | { |
| 522 | return 0; |
| 523 | } |
| 524 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_init); |
| 525 | |
| 526 | int virtio_transport_notify_send_pre_block(struct vsock_sock *vsk, |
| 527 | struct vsock_transport_send_notify_data *data) |
| 528 | { |
| 529 | return 0; |
| 530 | } |
| 531 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_block); |
| 532 | |
| 533 | int virtio_transport_notify_send_pre_enqueue(struct vsock_sock *vsk, |
| 534 | struct vsock_transport_send_notify_data *data) |
| 535 | { |
| 536 | return 0; |
| 537 | } |
| 538 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_pre_enqueue); |
| 539 | |
| 540 | int virtio_transport_notify_send_post_enqueue(struct vsock_sock *vsk, |
| 541 | ssize_t written, struct vsock_transport_send_notify_data *data) |
| 542 | { |
| 543 | return 0; |
| 544 | } |
| 545 | EXPORT_SYMBOL_GPL(virtio_transport_notify_send_post_enqueue); |
| 546 | |
| 547 | u64 virtio_transport_stream_rcvhiwat(struct vsock_sock *vsk) |
| 548 | { |
| 549 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 550 | |
| 551 | return vvs->buf_size; |
| 552 | } |
| 553 | EXPORT_SYMBOL_GPL(virtio_transport_stream_rcvhiwat); |
| 554 | |
| 555 | bool virtio_transport_stream_is_active(struct vsock_sock *vsk) |
| 556 | { |
| 557 | return true; |
| 558 | } |
| 559 | EXPORT_SYMBOL_GPL(virtio_transport_stream_is_active); |
| 560 | |
| 561 | bool virtio_transport_stream_allow(u32 cid, u32 port) |
| 562 | { |
| 563 | return true; |
| 564 | } |
| 565 | EXPORT_SYMBOL_GPL(virtio_transport_stream_allow); |
| 566 | |
| 567 | int virtio_transport_dgram_bind(struct vsock_sock *vsk, |
| 568 | struct sockaddr_vm *addr) |
| 569 | { |
| 570 | return -EOPNOTSUPP; |
| 571 | } |
| 572 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_bind); |
| 573 | |
| 574 | bool virtio_transport_dgram_allow(u32 cid, u32 port) |
| 575 | { |
| 576 | return false; |
| 577 | } |
| 578 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_allow); |
| 579 | |
| 580 | int virtio_transport_connect(struct vsock_sock *vsk) |
| 581 | { |
| 582 | struct virtio_vsock_pkt_info info = { |
| 583 | .op = VIRTIO_VSOCK_OP_REQUEST, |
| 584 | .type = VIRTIO_VSOCK_TYPE_STREAM, |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 585 | .vsk = vsk, |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 586 | }; |
| 587 | |
| 588 | return virtio_transport_send_pkt_info(vsk, &info); |
| 589 | } |
| 590 | EXPORT_SYMBOL_GPL(virtio_transport_connect); |
| 591 | |
| 592 | int virtio_transport_shutdown(struct vsock_sock *vsk, int mode) |
| 593 | { |
| 594 | struct virtio_vsock_pkt_info info = { |
| 595 | .op = VIRTIO_VSOCK_OP_SHUTDOWN, |
| 596 | .type = VIRTIO_VSOCK_TYPE_STREAM, |
| 597 | .flags = (mode & RCV_SHUTDOWN ? |
| 598 | VIRTIO_VSOCK_SHUTDOWN_RCV : 0) | |
| 599 | (mode & SEND_SHUTDOWN ? |
| 600 | VIRTIO_VSOCK_SHUTDOWN_SEND : 0), |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 601 | .vsk = vsk, |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 602 | }; |
| 603 | |
| 604 | return virtio_transport_send_pkt_info(vsk, &info); |
| 605 | } |
| 606 | EXPORT_SYMBOL_GPL(virtio_transport_shutdown); |
| 607 | |
| 608 | int |
| 609 | virtio_transport_dgram_enqueue(struct vsock_sock *vsk, |
| 610 | struct sockaddr_vm *remote_addr, |
| 611 | struct msghdr *msg, |
| 612 | size_t dgram_len) |
| 613 | { |
| 614 | return -EOPNOTSUPP; |
| 615 | } |
| 616 | EXPORT_SYMBOL_GPL(virtio_transport_dgram_enqueue); |
| 617 | |
| 618 | ssize_t |
| 619 | virtio_transport_stream_enqueue(struct vsock_sock *vsk, |
| 620 | struct msghdr *msg, |
| 621 | size_t len) |
| 622 | { |
| 623 | struct virtio_vsock_pkt_info info = { |
| 624 | .op = VIRTIO_VSOCK_OP_RW, |
| 625 | .type = VIRTIO_VSOCK_TYPE_STREAM, |
| 626 | .msg = msg, |
| 627 | .pkt_len = len, |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 628 | .vsk = vsk, |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 629 | }; |
| 630 | |
| 631 | return virtio_transport_send_pkt_info(vsk, &info); |
| 632 | } |
| 633 | EXPORT_SYMBOL_GPL(virtio_transport_stream_enqueue); |
| 634 | |
| 635 | void virtio_transport_destruct(struct vsock_sock *vsk) |
| 636 | { |
| 637 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 638 | |
| 639 | kfree(vvs); |
| 640 | } |
| 641 | EXPORT_SYMBOL_GPL(virtio_transport_destruct); |
| 642 | |
| 643 | static int virtio_transport_reset(struct vsock_sock *vsk, |
| 644 | struct virtio_vsock_pkt *pkt) |
| 645 | { |
| 646 | struct virtio_vsock_pkt_info info = { |
| 647 | .op = VIRTIO_VSOCK_OP_RST, |
| 648 | .type = VIRTIO_VSOCK_TYPE_STREAM, |
| 649 | .reply = !!pkt, |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 650 | .vsk = vsk, |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 651 | }; |
| 652 | |
| 653 | /* Send RST only if the original pkt is not a RST pkt */ |
| 654 | if (pkt && le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) |
| 655 | return 0; |
| 656 | |
| 657 | return virtio_transport_send_pkt_info(vsk, &info); |
| 658 | } |
| 659 | |
| 660 | /* Normally packets are associated with a socket. There may be no socket if an |
| 661 | * attempt was made to connect to a socket that does not exist. |
| 662 | */ |
| 663 | static int virtio_transport_reset_no_sock(struct virtio_vsock_pkt *pkt) |
| 664 | { |
| 665 | struct virtio_vsock_pkt_info info = { |
| 666 | .op = VIRTIO_VSOCK_OP_RST, |
| 667 | .type = le16_to_cpu(pkt->hdr.type), |
| 668 | .reply = true, |
| 669 | }; |
| 670 | |
| 671 | /* Send RST only if the original pkt is not a RST pkt */ |
| 672 | if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) |
| 673 | return 0; |
| 674 | |
| 675 | pkt = virtio_transport_alloc_pkt(&info, 0, |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 676 | le64_to_cpu(pkt->hdr.dst_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 677 | le32_to_cpu(pkt->hdr.dst_port), |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 678 | le64_to_cpu(pkt->hdr.src_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 679 | le32_to_cpu(pkt->hdr.src_port)); |
| 680 | if (!pkt) |
| 681 | return -ENOMEM; |
| 682 | |
| 683 | return virtio_transport_get_ops()->send_pkt(pkt); |
| 684 | } |
| 685 | |
| 686 | static void virtio_transport_wait_close(struct sock *sk, long timeout) |
| 687 | { |
| 688 | if (timeout) { |
WANG Cong | d9dc8b0 | 2016-11-11 10:20:50 -0800 | [diff] [blame] | 689 | DEFINE_WAIT_FUNC(wait, woken_wake_function); |
| 690 | |
| 691 | add_wait_queue(sk_sleep(sk), &wait); |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 692 | |
| 693 | do { |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 694 | if (sk_wait_event(sk, &timeout, |
WANG Cong | d9dc8b0 | 2016-11-11 10:20:50 -0800 | [diff] [blame] | 695 | sock_flag(sk, SOCK_DONE), &wait)) |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 696 | break; |
| 697 | } while (!signal_pending(current) && timeout); |
| 698 | |
WANG Cong | d9dc8b0 | 2016-11-11 10:20:50 -0800 | [diff] [blame] | 699 | remove_wait_queue(sk_sleep(sk), &wait); |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 700 | } |
| 701 | } |
| 702 | |
| 703 | static void virtio_transport_do_close(struct vsock_sock *vsk, |
| 704 | bool cancel_timeout) |
| 705 | { |
| 706 | struct sock *sk = sk_vsock(vsk); |
| 707 | |
| 708 | sock_set_flag(sk, SOCK_DONE); |
| 709 | vsk->peer_shutdown = SHUTDOWN_MASK; |
| 710 | if (vsock_stream_has_data(vsk) <= 0) |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 711 | sk->sk_state = TCP_CLOSING; |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 712 | sk->sk_state_change(sk); |
| 713 | |
| 714 | if (vsk->close_work_scheduled && |
| 715 | (!cancel_timeout || cancel_delayed_work(&vsk->close_work))) { |
| 716 | vsk->close_work_scheduled = false; |
| 717 | |
| 718 | vsock_remove_sock(vsk); |
| 719 | |
| 720 | /* Release refcnt obtained when we scheduled the timeout */ |
| 721 | sock_put(sk); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | static void virtio_transport_close_timeout(struct work_struct *work) |
| 726 | { |
| 727 | struct vsock_sock *vsk = |
| 728 | container_of(work, struct vsock_sock, close_work.work); |
| 729 | struct sock *sk = sk_vsock(vsk); |
| 730 | |
| 731 | sock_hold(sk); |
| 732 | lock_sock(sk); |
| 733 | |
| 734 | if (!sock_flag(sk, SOCK_DONE)) { |
| 735 | (void)virtio_transport_reset(vsk, NULL); |
| 736 | |
| 737 | virtio_transport_do_close(vsk, false); |
| 738 | } |
| 739 | |
| 740 | vsk->close_work_scheduled = false; |
| 741 | |
| 742 | release_sock(sk); |
| 743 | sock_put(sk); |
| 744 | } |
| 745 | |
| 746 | /* User context, vsk->sk is locked */ |
| 747 | static bool virtio_transport_close(struct vsock_sock *vsk) |
| 748 | { |
| 749 | struct sock *sk = &vsk->sk; |
| 750 | |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 751 | if (!(sk->sk_state == TCP_ESTABLISHED || |
| 752 | sk->sk_state == TCP_CLOSING)) |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 753 | return true; |
| 754 | |
| 755 | /* Already received SHUTDOWN from peer, reply with RST */ |
| 756 | if ((vsk->peer_shutdown & SHUTDOWN_MASK) == SHUTDOWN_MASK) { |
| 757 | (void)virtio_transport_reset(vsk, NULL); |
| 758 | return true; |
| 759 | } |
| 760 | |
| 761 | if ((sk->sk_shutdown & SHUTDOWN_MASK) != SHUTDOWN_MASK) |
| 762 | (void)virtio_transport_shutdown(vsk, SHUTDOWN_MASK); |
| 763 | |
| 764 | if (sock_flag(sk, SOCK_LINGER) && !(current->flags & PF_EXITING)) |
| 765 | virtio_transport_wait_close(sk, sk->sk_lingertime); |
| 766 | |
| 767 | if (sock_flag(sk, SOCK_DONE)) { |
| 768 | return true; |
| 769 | } |
| 770 | |
| 771 | sock_hold(sk); |
| 772 | INIT_DELAYED_WORK(&vsk->close_work, |
| 773 | virtio_transport_close_timeout); |
| 774 | vsk->close_work_scheduled = true; |
| 775 | schedule_delayed_work(&vsk->close_work, VSOCK_CLOSE_TIMEOUT); |
| 776 | return false; |
| 777 | } |
| 778 | |
| 779 | void virtio_transport_release(struct vsock_sock *vsk) |
| 780 | { |
| 781 | struct sock *sk = &vsk->sk; |
| 782 | bool remove_sock = true; |
| 783 | |
| 784 | lock_sock(sk); |
| 785 | if (sk->sk_type == SOCK_STREAM) |
| 786 | remove_sock = virtio_transport_close(vsk); |
| 787 | release_sock(sk); |
| 788 | |
| 789 | if (remove_sock) |
| 790 | vsock_remove_sock(vsk); |
| 791 | } |
| 792 | EXPORT_SYMBOL_GPL(virtio_transport_release); |
| 793 | |
| 794 | static int |
| 795 | virtio_transport_recv_connecting(struct sock *sk, |
| 796 | struct virtio_vsock_pkt *pkt) |
| 797 | { |
| 798 | struct vsock_sock *vsk = vsock_sk(sk); |
| 799 | int err; |
| 800 | int skerr; |
| 801 | |
| 802 | switch (le16_to_cpu(pkt->hdr.op)) { |
| 803 | case VIRTIO_VSOCK_OP_RESPONSE: |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 804 | sk->sk_state = TCP_ESTABLISHED; |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 805 | sk->sk_socket->state = SS_CONNECTED; |
| 806 | vsock_insert_connected(vsk); |
| 807 | sk->sk_state_change(sk); |
| 808 | break; |
| 809 | case VIRTIO_VSOCK_OP_INVALID: |
| 810 | break; |
| 811 | case VIRTIO_VSOCK_OP_RST: |
| 812 | skerr = ECONNRESET; |
| 813 | err = 0; |
| 814 | goto destroy; |
| 815 | default: |
| 816 | skerr = EPROTO; |
| 817 | err = -EINVAL; |
| 818 | goto destroy; |
| 819 | } |
| 820 | return 0; |
| 821 | |
| 822 | destroy: |
| 823 | virtio_transport_reset(vsk, pkt); |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 824 | sk->sk_state = TCP_CLOSE; |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 825 | sk->sk_err = skerr; |
| 826 | sk->sk_error_report(sk); |
| 827 | return err; |
| 828 | } |
| 829 | |
| 830 | static int |
| 831 | virtio_transport_recv_connected(struct sock *sk, |
| 832 | struct virtio_vsock_pkt *pkt) |
| 833 | { |
| 834 | struct vsock_sock *vsk = vsock_sk(sk); |
| 835 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 836 | int err = 0; |
| 837 | |
| 838 | switch (le16_to_cpu(pkt->hdr.op)) { |
| 839 | case VIRTIO_VSOCK_OP_RW: |
| 840 | pkt->len = le32_to_cpu(pkt->hdr.len); |
| 841 | pkt->off = 0; |
| 842 | |
| 843 | spin_lock_bh(&vvs->rx_lock); |
| 844 | virtio_transport_inc_rx_pkt(vvs, pkt); |
| 845 | list_add_tail(&pkt->list, &vvs->rx_queue); |
| 846 | spin_unlock_bh(&vvs->rx_lock); |
| 847 | |
| 848 | sk->sk_data_ready(sk); |
| 849 | return err; |
| 850 | case VIRTIO_VSOCK_OP_CREDIT_UPDATE: |
| 851 | sk->sk_write_space(sk); |
| 852 | break; |
| 853 | case VIRTIO_VSOCK_OP_SHUTDOWN: |
| 854 | if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_RCV) |
| 855 | vsk->peer_shutdown |= RCV_SHUTDOWN; |
| 856 | if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SHUTDOWN_SEND) |
| 857 | vsk->peer_shutdown |= SEND_SHUTDOWN; |
| 858 | if (vsk->peer_shutdown == SHUTDOWN_MASK && |
| 859 | vsock_stream_has_data(vsk) <= 0) |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 860 | sk->sk_state = TCP_CLOSING; |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 861 | if (le32_to_cpu(pkt->hdr.flags)) |
| 862 | sk->sk_state_change(sk); |
| 863 | break; |
| 864 | case VIRTIO_VSOCK_OP_RST: |
| 865 | virtio_transport_do_close(vsk, true); |
| 866 | break; |
| 867 | default: |
| 868 | err = -EINVAL; |
| 869 | break; |
| 870 | } |
| 871 | |
| 872 | virtio_transport_free_pkt(pkt); |
| 873 | return err; |
| 874 | } |
| 875 | |
| 876 | static void |
| 877 | virtio_transport_recv_disconnecting(struct sock *sk, |
| 878 | struct virtio_vsock_pkt *pkt) |
| 879 | { |
| 880 | struct vsock_sock *vsk = vsock_sk(sk); |
| 881 | |
| 882 | if (le16_to_cpu(pkt->hdr.op) == VIRTIO_VSOCK_OP_RST) |
| 883 | virtio_transport_do_close(vsk, true); |
| 884 | } |
| 885 | |
| 886 | static int |
| 887 | virtio_transport_send_response(struct vsock_sock *vsk, |
| 888 | struct virtio_vsock_pkt *pkt) |
| 889 | { |
| 890 | struct virtio_vsock_pkt_info info = { |
| 891 | .op = VIRTIO_VSOCK_OP_RESPONSE, |
| 892 | .type = VIRTIO_VSOCK_TYPE_STREAM, |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 893 | .remote_cid = le64_to_cpu(pkt->hdr.src_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 894 | .remote_port = le32_to_cpu(pkt->hdr.src_port), |
| 895 | .reply = true, |
Peng Tao | 36d277b | 2017-03-15 09:32:14 +0800 | [diff] [blame] | 896 | .vsk = vsk, |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 897 | }; |
| 898 | |
| 899 | return virtio_transport_send_pkt_info(vsk, &info); |
| 900 | } |
| 901 | |
| 902 | /* Handle server socket */ |
| 903 | static int |
| 904 | virtio_transport_recv_listen(struct sock *sk, struct virtio_vsock_pkt *pkt) |
| 905 | { |
| 906 | struct vsock_sock *vsk = vsock_sk(sk); |
| 907 | struct vsock_sock *vchild; |
| 908 | struct sock *child; |
| 909 | |
| 910 | if (le16_to_cpu(pkt->hdr.op) != VIRTIO_VSOCK_OP_REQUEST) { |
| 911 | virtio_transport_reset(vsk, pkt); |
| 912 | return -EINVAL; |
| 913 | } |
| 914 | |
| 915 | if (sk_acceptq_is_full(sk)) { |
| 916 | virtio_transport_reset(vsk, pkt); |
| 917 | return -ENOMEM; |
| 918 | } |
| 919 | |
| 920 | child = __vsock_create(sock_net(sk), NULL, sk, GFP_KERNEL, |
| 921 | sk->sk_type, 0); |
| 922 | if (!child) { |
| 923 | virtio_transport_reset(vsk, pkt); |
| 924 | return -ENOMEM; |
| 925 | } |
| 926 | |
| 927 | sk->sk_ack_backlog++; |
| 928 | |
| 929 | lock_sock_nested(child, SINGLE_DEPTH_NESTING); |
| 930 | |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 931 | child->sk_state = TCP_ESTABLISHED; |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 932 | |
| 933 | vchild = vsock_sk(child); |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 934 | vsock_addr_init(&vchild->local_addr, le64_to_cpu(pkt->hdr.dst_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 935 | le32_to_cpu(pkt->hdr.dst_port)); |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 936 | vsock_addr_init(&vchild->remote_addr, le64_to_cpu(pkt->hdr.src_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 937 | le32_to_cpu(pkt->hdr.src_port)); |
| 938 | |
| 939 | vsock_insert_connected(vchild); |
| 940 | vsock_enqueue_accept(sk, child); |
| 941 | virtio_transport_send_response(vchild, pkt); |
| 942 | |
| 943 | release_sock(child); |
| 944 | |
| 945 | sk->sk_data_ready(sk); |
| 946 | return 0; |
| 947 | } |
| 948 | |
| 949 | static bool virtio_transport_space_update(struct sock *sk, |
| 950 | struct virtio_vsock_pkt *pkt) |
| 951 | { |
| 952 | struct vsock_sock *vsk = vsock_sk(sk); |
| 953 | struct virtio_vsock_sock *vvs = vsk->trans; |
| 954 | bool space_available; |
| 955 | |
| 956 | /* buf_alloc and fwd_cnt is always included in the hdr */ |
| 957 | spin_lock_bh(&vvs->tx_lock); |
| 958 | vvs->peer_buf_alloc = le32_to_cpu(pkt->hdr.buf_alloc); |
| 959 | vvs->peer_fwd_cnt = le32_to_cpu(pkt->hdr.fwd_cnt); |
| 960 | space_available = virtio_transport_has_space(vsk); |
| 961 | spin_unlock_bh(&vvs->tx_lock); |
| 962 | return space_available; |
| 963 | } |
| 964 | |
| 965 | /* We are under the virtio-vsock's vsock->rx_lock or vhost-vsock's vq->mutex |
| 966 | * lock. |
| 967 | */ |
| 968 | void virtio_transport_recv_pkt(struct virtio_vsock_pkt *pkt) |
| 969 | { |
| 970 | struct sockaddr_vm src, dst; |
| 971 | struct vsock_sock *vsk; |
| 972 | struct sock *sk; |
| 973 | bool space_available; |
| 974 | |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 975 | vsock_addr_init(&src, le64_to_cpu(pkt->hdr.src_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 976 | le32_to_cpu(pkt->hdr.src_port)); |
Michael S. Tsirkin | f83f12d | 2016-12-06 06:07:15 +0200 | [diff] [blame] | 977 | vsock_addr_init(&dst, le64_to_cpu(pkt->hdr.dst_cid), |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 978 | le32_to_cpu(pkt->hdr.dst_port)); |
| 979 | |
| 980 | trace_virtio_transport_recv_pkt(src.svm_cid, src.svm_port, |
| 981 | dst.svm_cid, dst.svm_port, |
| 982 | le32_to_cpu(pkt->hdr.len), |
| 983 | le16_to_cpu(pkt->hdr.type), |
| 984 | le16_to_cpu(pkt->hdr.op), |
| 985 | le32_to_cpu(pkt->hdr.flags), |
| 986 | le32_to_cpu(pkt->hdr.buf_alloc), |
| 987 | le32_to_cpu(pkt->hdr.fwd_cnt)); |
| 988 | |
| 989 | if (le16_to_cpu(pkt->hdr.type) != VIRTIO_VSOCK_TYPE_STREAM) { |
| 990 | (void)virtio_transport_reset_no_sock(pkt); |
| 991 | goto free_pkt; |
| 992 | } |
| 993 | |
| 994 | /* The socket must be in connected or bound table |
| 995 | * otherwise send reset back |
| 996 | */ |
| 997 | sk = vsock_find_connected_socket(&src, &dst); |
| 998 | if (!sk) { |
| 999 | sk = vsock_find_bound_socket(&dst); |
| 1000 | if (!sk) { |
| 1001 | (void)virtio_transport_reset_no_sock(pkt); |
| 1002 | goto free_pkt; |
| 1003 | } |
| 1004 | } |
| 1005 | |
| 1006 | vsk = vsock_sk(sk); |
| 1007 | |
| 1008 | space_available = virtio_transport_space_update(sk, pkt); |
| 1009 | |
| 1010 | lock_sock(sk); |
| 1011 | |
| 1012 | /* Update CID in case it has changed after a transport reset event */ |
| 1013 | vsk->local_addr.svm_cid = dst.svm_cid; |
| 1014 | |
| 1015 | if (space_available) |
| 1016 | sk->sk_write_space(sk); |
| 1017 | |
| 1018 | switch (sk->sk_state) { |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 1019 | case TCP_LISTEN: |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 1020 | virtio_transport_recv_listen(sk, pkt); |
| 1021 | virtio_transport_free_pkt(pkt); |
| 1022 | break; |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 1023 | case TCP_SYN_SENT: |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 1024 | virtio_transport_recv_connecting(sk, pkt); |
| 1025 | virtio_transport_free_pkt(pkt); |
| 1026 | break; |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 1027 | case TCP_ESTABLISHED: |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 1028 | virtio_transport_recv_connected(sk, pkt); |
| 1029 | break; |
Stefan Hajnoczi | 3b4477d | 2017-10-05 16:46:52 -0400 | [diff] [blame] | 1030 | case TCP_CLOSING: |
Asias He | 06a8fc7 | 2016-07-28 15:36:32 +0100 | [diff] [blame] | 1031 | virtio_transport_recv_disconnecting(sk, pkt); |
| 1032 | virtio_transport_free_pkt(pkt); |
| 1033 | break; |
| 1034 | default: |
| 1035 | virtio_transport_free_pkt(pkt); |
| 1036 | break; |
| 1037 | } |
| 1038 | release_sock(sk); |
| 1039 | |
| 1040 | /* Release refcnt obtained when we fetched this socket out of the |
| 1041 | * bound or connected list. |
| 1042 | */ |
| 1043 | sock_put(sk); |
| 1044 | return; |
| 1045 | |
| 1046 | free_pkt: |
| 1047 | virtio_transport_free_pkt(pkt); |
| 1048 | } |
| 1049 | EXPORT_SYMBOL_GPL(virtio_transport_recv_pkt); |
| 1050 | |
| 1051 | void virtio_transport_free_pkt(struct virtio_vsock_pkt *pkt) |
| 1052 | { |
| 1053 | kfree(pkt->buf); |
| 1054 | kfree(pkt); |
| 1055 | } |
| 1056 | EXPORT_SYMBOL_GPL(virtio_transport_free_pkt); |
| 1057 | |
| 1058 | MODULE_LICENSE("GPL v2"); |
| 1059 | MODULE_AUTHOR("Asias He"); |
| 1060 | MODULE_DESCRIPTION("common code for virtio vsock"); |