tools/usb/usbip/src/usbip_network.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright (C) 2011 matt mooney <mfm@muteddisk.com>
   4  *               2005-2007 Takahiro Hirofuchi
   5  */
   6
   7 #include <sys/socket.h>
   8
   9 #include <string.h>
  10
  11 #include <arpa/inet.h>
  12 #include <netdb.h>
  13 #include <netinet/tcp.h>
  14 #include <unistd.h>
  15
  16 #ifdef HAVE_LIBWRAP
  17 #include <tcpd.h>
  18 #endif
  19
  20 #include "usbip_common.h"
  21 #include "usbip_network.h"
  22
  23 int usbip_port = 3240;
  24 char *usbip_port_string = "3240";
  25
  26 void usbip_setup_port_number(char *arg)
  27 {
  28         dbg("parsing port arg '%s'", arg);
  29         char *end;
  30         unsigned long int port = strtoul(arg, &end, 10);
  31
  32         if (end == arg) {
  33                 err("port: could not parse '%s' as a decimal integer", arg);
  34                 return;
  35         }
  36
  37         if (*end != '\0') {
  38                 err("port: garbage at end of '%s'", arg);
  39                 return;
  40         }
  41
  42         if (port > UINT16_MAX) {
  43                 err("port: %s too high (max=%d)",
  44                     arg, UINT16_MAX);
  45                 return;
  46         }
  47
  48         usbip_port = port;
  49         usbip_port_string = arg;
  50         info("using port %d (\"%s\")", usbip_port, usbip_port_string);
  51 }
  52
  53 uint32_t usbip_net_pack_uint32_t(int pack, uint32_t num)
  54 {
  55         uint32_t i;
  56
  57         if (pack)
  58                 i = htonl(num);
  59         else
  60                 i = ntohl(num);
  61
  62         return i;
  63 }
  64
  65 uint16_t usbip_net_pack_uint16_t(int pack, uint16_t num)
  66 {
  67         uint16_t i;
  68
  69         if (pack)
  70                 i = htons(num);
  71         else
  72                 i = ntohs(num);
  73
  74         return i;
  75 }
  76
  77 void usbip_net_pack_usb_device(int pack, struct usbip_usb_device *udev)
  78 {
  79         udev->busnum = usbip_net_pack_uint32_t(pack, udev->busnum);
  80         udev->devnum = usbip_net_pack_uint32_t(pack, udev->devnum);
  81         udev->speed = usbip_net_pack_uint32_t(pack, udev->speed);
  82
  83         udev->idVendor = usbip_net_pack_uint16_t(pack, udev->idVendor);
  84         udev->idProduct = usbip_net_pack_uint16_t(pack, udev->idProduct);
  85         udev->bcdDevice = usbip_net_pack_uint16_t(pack, udev->bcdDevice);
  86 }
  87
  88 void usbip_net_pack_usb_interface(int pack __attribute__((unused)),
  89                                   struct usbip_usb_interface *udev
  90                                   __attribute__((unused)))
  91 {
  92         /* uint8_t members need nothing */
  93 }
  94
  95 static ssize_t usbip_net_xmit(int sockfd, void *buff, size_t bufflen,
  96                               int sending)
  97 {
  98         ssize_t nbytes;
  99         ssize_t total = 0;
 100
 101         if (!bufflen)
 102                 return 0;
 103
 104         do {
 105                 if (sending)
 106                         nbytes = send(sockfd, buff, bufflen, 0);
 107                 else
 108                         nbytes = recv(sockfd, buff, bufflen, MSG_WAITALL);
 109
 110                 if (nbytes <= 0)
 111                         return -1;
 112
 113                 buff     = (void *)((intptr_t) buff + nbytes);
 114                 bufflen -= nbytes;
 115                 total   += nbytes;
 116
 117         } while (bufflen > 0);
 118
 119         return total;
 120 }
 121
 122 ssize_t usbip_net_recv(int sockfd, void *buff, size_t bufflen)
 123 {
 124         return usbip_net_xmit(sockfd, buff, bufflen, 0);
 125 }
 126
 127 ssize_t usbip_net_send(int sockfd, void *buff, size_t bufflen)
 128 {
 129         return usbip_net_xmit(sockfd, buff, bufflen, 1);
 130 }
 131
 132 static inline void usbip_net_pack_op_common(int pack,
 133                                             struct op_common *op_common)
 134 {
 135         op_common->version = usbip_net_pack_uint16_t(pack, op_common->version);
 136         op_common->code = usbip_net_pack_uint16_t(pack, op_common->code);
 137         op_common->status = usbip_net_pack_uint32_t(pack, op_common->status);
 138 }
 139
 140 int usbip_net_send_op_common(int sockfd, uint32_t code, uint32_t status)
 141 {
 142         struct op_common op_common;
 143         int rc;
 144
 145         memset(&op_common, 0, sizeof(op_common));
 146
 147         op_common.version = USBIP_VERSION;
 148         op_common.code    = code;
 149         op_common.status  = status;
 150
 151         usbip_net_pack_op_common(1, &op_common);
 152
 153         rc = usbip_net_send(sockfd, &op_common, sizeof(op_common));
 154         if (rc < 0) {
 155                 dbg("usbip_net_send failed: %d", rc);
 156                 return -1;
 157         }
 158
 159         return 0;
 160 }
 161
 162 int usbip_net_recv_op_common(int sockfd, uint16_t *code, int *status)
 163 {
 164         struct op_common op_common;
 165         int rc;
 166
 167         memset(&op_common, 0, sizeof(op_common));
 168
 169         rc = usbip_net_recv(sockfd, &op_common, sizeof(op_common));
 170         if (rc < 0) {
 171                 dbg("usbip_net_recv failed: %d", rc);
 172                 goto err;
 173         }
 174
 175         usbip_net_pack_op_common(0, &op_common);
 176
 177         if (op_common.version != USBIP_VERSION) {
 178                 err("USBIP Kernel and tool version mismatch: %d %d:",
 179                     op_common.version, USBIP_VERSION);
 180                 goto err;
 181         }
 182
 183         switch (*code) {
 184         case OP_UNSPEC:
 185                 break;
 186         default:
 187                 if (op_common.code != *code) {
 188                         dbg("unexpected pdu %#0x for %#0x", op_common.code,
 189                             *code);
 190                         /* return error status */
 191                         *status = ST_ERROR;
 192                         goto err;
 193                 }
 194         }
 195
 196         *status = op_common.status;
 197
 198         if (op_common.status != ST_OK) {
 199                 dbg("request failed at peer: %d", op_common.status);
 200                 goto err;
 201         }
 202
 203         *code = op_common.code;
 204
 205         return 0;
 206 err:
 207         return -1;
 208 }
 209
 210 int usbip_net_set_reuseaddr(int sockfd)
 211 {
 212         const int val = 1;
 213         int ret;
 214
 215         ret = setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &val, sizeof(val));
 216         if (ret < 0)
 217                 dbg("setsockopt: SO_REUSEADDR");
 218
 219         return ret;
 220 }
 221
 222 int usbip_net_set_nodelay(int sockfd)
 223 {
 224         const int val = 1;
 225         int ret;
 226
 227         ret = setsockopt(sockfd, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val));
 228         if (ret < 0)
 229                 dbg("setsockopt: TCP_NODELAY");
 230
 231         return ret;
 232 }
 233
 234 int usbip_net_set_keepalive(int sockfd)
 235 {
 236         const int val = 1;
 237         int ret;
 238
 239         ret = setsockopt(sockfd, SOL_SOCKET, SO_KEEPALIVE, &val, sizeof(val));
 240         if (ret < 0)
 241                 dbg("setsockopt: SO_KEEPALIVE");
 242
 243         return ret;
 244 }
 245
 246 int usbip_net_set_v6only(int sockfd)
 247 {
 248         const int val = 1;
 249         int ret;
 250
 251         ret = setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &val, sizeof(val));
 252         if (ret < 0)
 253                 dbg("setsockopt: IPV6_V6ONLY");
 254
 255         return ret;
 256 }
 257
 258 /*
 259  * IPv6 Ready
 260  */
 261 int usbip_net_tcp_connect(char *hostname, char *service)
 262 {
 263         struct addrinfo hints, *res, *rp;
 264         int sockfd;
 265         int ret;
 266
 267         memset(&hints, 0, sizeof(hints));
 268         hints.ai_family = AF_UNSPEC;
 269         hints.ai_socktype = SOCK_STREAM;
 270
 271         /* get all possible addresses */
 272         ret = getaddrinfo(hostname, service, &hints, &res);
 273         if (ret < 0) {
 274                 dbg("getaddrinfo: %s service %s: %s", hostname, service,
 275                     gai_strerror(ret));
 276                 return ret;
 277         }
 278
 279         /* try the addresses */
 280         for (rp = res; rp; rp = rp->ai_next) {
 281                 sockfd = socket(rp->ai_family, rp->ai_socktype,
 282                                 rp->ai_protocol);
 283                 if (sockfd < 0)
 284                         continue;
 285
 286                 /* should set TCP_NODELAY for usbip */
 287                 usbip_net_set_nodelay(sockfd);
 288                 /* TODO: write code for heartbeat */
 289                 usbip_net_set_keepalive(sockfd);
 290
 291                 if (connect(sockfd, rp->ai_addr, rp->ai_addrlen) == 0)
 292                         break;
 293
 294                 close(sockfd);
 295         }
 296
 297         freeaddrinfo(res);
 298
 299         if (!rp)
 300                 return EAI_SYSTEM;
 301
 302         return sockfd;
 303 }