File:  [Qemu by Fabrice Bellard] / qemu / migration-tcp.c
Revision 1.1.1.6 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 19:16:32 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1001, HEAD
qemu 1.0.1

    1: /*
    2:  * QEMU live migration
    3:  *
    4:  * Copyright IBM, Corp. 2008
    5:  *
    6:  * Authors:
    7:  *  Anthony Liguori   <aliguori@us.ibm.com>
    8:  *
    9:  * This work is licensed under the terms of the GNU GPL, version 2.  See
   10:  * the COPYING file in the top-level directory.
   11:  *
   12:  */
   13: 
   14: #include "qemu-common.h"
   15: #include "qemu_socket.h"
   16: #include "migration.h"
   17: #include "qemu-char.h"
   18: #include "buffered_file.h"
   19: #include "block.h"
   20: 
   21: //#define DEBUG_MIGRATION_TCP
   22: 
   23: #ifdef DEBUG_MIGRATION_TCP
   24: #define DPRINTF(fmt, ...) \
   25:     do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
   26: #else
   27: #define DPRINTF(fmt, ...) \
   28:     do { } while (0)
   29: #endif
   30: 
   31: static int socket_errno(MigrationState *s)
   32: {
   33:     return socket_error();
   34: }
   35: 
   36: static int socket_write(MigrationState *s, const void * buf, size_t size)
   37: {
   38:     return send(s->fd, buf, size, 0);
   39: }
   40: 
   41: static int tcp_close(MigrationState *s)
   42: {
   43:     DPRINTF("tcp_close\n");
   44:     if (s->fd != -1) {
   45:         close(s->fd);
   46:         s->fd = -1;
   47:     }
   48:     return 0;
   49: }
   50: 
   51: static void tcp_wait_for_connect(void *opaque)
   52: {
   53:     MigrationState *s = opaque;
   54:     int val, ret;
   55:     socklen_t valsize = sizeof(val);
   56: 
   57:     DPRINTF("connect completed\n");
   58:     do {
   59:         ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, (void *) &val, &valsize);
   60:     } while (ret == -1 && (socket_error()) == EINTR);
   61: 
   62:     if (ret < 0) {
   63:         migrate_fd_error(s);
   64:         return;
   65:     }
   66: 
   67:     qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
   68: 
   69:     if (val == 0)
   70:         migrate_fd_connect(s);
   71:     else {
   72:         DPRINTF("error connecting %d\n", val);
   73:         migrate_fd_error(s);
   74:     }
   75: }
   76: 
   77: int tcp_start_outgoing_migration(MigrationState *s, const char *host_port)
   78: {
   79:     struct sockaddr_in addr;
   80:     int ret;
   81: 
   82:     ret = parse_host_port(&addr, host_port);
   83:     if (ret < 0) {
   84:         return ret;
   85:     }
   86: 
   87:     s->get_error = socket_errno;
   88:     s->write = socket_write;
   89:     s->close = tcp_close;
   90: 
   91:     s->fd = qemu_socket(PF_INET, SOCK_STREAM, 0);
   92:     if (s->fd == -1) {
   93:         DPRINTF("Unable to open socket");
   94:         return -socket_error();
   95:     }
   96: 
   97:     socket_set_nonblock(s->fd);
   98: 
   99:     do {
  100:         ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
  101:         if (ret == -1) {
  102:             ret = -socket_error();
  103:         }
  104:         if (ret == -EINPROGRESS || ret == -EWOULDBLOCK) {
  105:             qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
  106:             return 0;
  107:         }
  108:     } while (ret == -EINTR);
  109: 
  110:     if (ret < 0) {
  111:         DPRINTF("connect failed\n");
  112:         migrate_fd_error(s);
  113:         return ret;
  114:     }
  115:     migrate_fd_connect(s);
  116:     return 0;
  117: }
  118: 
  119: static void tcp_accept_incoming_migration(void *opaque)
  120: {
  121:     struct sockaddr_in addr;
  122:     socklen_t addrlen = sizeof(addr);
  123:     int s = (intptr_t)opaque;
  124:     QEMUFile *f;
  125:     int c;
  126: 
  127:     do {
  128:         c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
  129:     } while (c == -1 && socket_error() == EINTR);
  130: 
  131:     DPRINTF("accepted migration\n");
  132: 
  133:     if (c == -1) {
  134:         fprintf(stderr, "could not accept migration connection\n");
  135:         goto out2;
  136:     }
  137: 
  138:     f = qemu_fopen_socket(c);
  139:     if (f == NULL) {
  140:         fprintf(stderr, "could not qemu_fopen socket\n");
  141:         goto out;
  142:     }
  143: 
  144:     process_incoming_migration(f);
  145:     qemu_fclose(f);
  146: out:
  147:     close(c);
  148: out2:
  149:     qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
  150:     close(s);
  151: }
  152: 
  153: int tcp_start_incoming_migration(const char *host_port)
  154: {
  155:     struct sockaddr_in addr;
  156:     int val;
  157:     int s;
  158: 
  159:     DPRINTF("Attempting to start an incoming migration\n");
  160: 
  161:     if (parse_host_port(&addr, host_port) < 0) {
  162:         fprintf(stderr, "invalid host/port combination: %s\n", host_port);
  163:         return -EINVAL;
  164:     }
  165: 
  166:     s = qemu_socket(PF_INET, SOCK_STREAM, 0);
  167:     if (s == -1) {
  168:         return -socket_error();
  169:     }
  170: 
  171:     val = 1;
  172:     setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (const char *)&val, sizeof(val));
  173: 
  174:     if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
  175:         goto err;
  176:     }
  177:     if (listen(s, 1) == -1) {
  178:         goto err;
  179:     }
  180: 
  181:     qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
  182:                          (void *)(intptr_t)s);
  183: 
  184:     return 0;
  185: 
  186: err:
  187:     close(s);
  188:     return -socket_error();
  189: }

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