lib/stream-tcp.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010, 2012, 2013, 2014, 2015 Nicira, Inc.
   3  *
   4  * Licensed under the Apache License, Version 2.0 (the "License");
   5  * you may not use this file except in compliance with the License.
   6  * You may obtain a copy of the License at:
   7  *
   8  *     http://www.apache.org/licenses/LICENSE-2.0
   9  *
  10  * Unless required by applicable law or agreed to in writing, software
  11  * distributed under the License is distributed on an "AS IS" BASIS,
  12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  13  * See the License for the specific language governing permissions and
  14  * limitations under the License.
  15  */
  16
  17 #include <config.h>
  18 #include "stream.h"
  19 #include <errno.h>
  20 #include <inttypes.h>
  21 #include <sys/types.h>
  22 #include <netinet/in.h>
  23 #include <netdb.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/socket.h>
  27 #include <unistd.h>
  28 #include "openvswitch/dynamic-string.h"
  29 #include "packets.h"
  30 #include "socket-util.h"
  31 #include "util.h"
  32 #include "stream-provider.h"
  33 #include "stream-fd.h"
  34 #include "openvswitch/vlog.h"
  35
  36 VLOG_DEFINE_THIS_MODULE(stream_tcp);
  37
  38 /* Active TCP. */
  39
  40 /* Takes ownership of 'name'. */
  41 static int
  42 new_tcp_stream(char *name, int fd, int connect_status, struct stream **streamp)
  43 {
  44     if (connect_status == 0) {
  45         setsockopt_tcp_nodelay(fd);
  46     }
  47
  48     return new_fd_stream(name, fd, connect_status, AF_INET, streamp);
  49 }
  50
  51 static int
  52 tcp_open(const char *name, char *suffix, struct stream **streamp, uint8_t dscp)
  53 {
  54     int fd, error;
  55
  56     error = inet_open_active(SOCK_STREAM, suffix, -1, NULL, &fd, dscp);
  57     if (fd >= 0) {
  58         return new_tcp_stream(xstrdup(name), fd, error, streamp);
  59     } else {
  60         VLOG_ERR("%s: connect: %s", name, ovs_strerror(error));
  61         return error;
  62     }
  63 }
  64
  65 const struct stream_class tcp_stream_class = {
  66     "tcp",                      /* name */
  67     true,                       /* needs_probes */
  68     tcp_open,                   /* open */
  69     NULL,                       /* close */
  70     NULL,                       /* connect */
  71     NULL,                       /* recv */
  72     NULL,                       /* send */
  73     NULL,                       /* run */
  74     NULL,                       /* run_wait */
  75     NULL,                       /* wait */
  76 };
  77 \f
  78 /* Passive TCP. */
  79
  80 static int ptcp_accept(int fd, const struct sockaddr_storage *,
  81                        size_t, struct stream **streamp);
  82
  83 static int
  84 new_pstream(char *suffix, const char *name, struct pstream **pstreamp,
  85             int dscp, char *unlink_path, bool kernel_print_port)
  86 {
  87     struct sockaddr_storage ss;
  88     int error;
  89     int fd;
  90
  91     fd = inet_open_passive(SOCK_STREAM, suffix, -1, &ss, dscp,
  92                            kernel_print_port);
  93     if (fd < 0) {
  94         return -fd;
  95     }
  96
  97     struct ds bound_name = DS_EMPTY_INITIALIZER;
  98     if (!name) {
  99         ds_put_format(&bound_name, "ptcp:%"PRIu16":", ss_get_port(&ss));
 100         ss_format_address(&ss, &bound_name);
 101     } else {
 102         ds_put_cstr(&bound_name, name);
 103     }
 104
 105     error = new_fd_pstream(ds_steal_cstr(&bound_name), fd,
 106                            ptcp_accept, unlink_path, pstreamp);
 107     if (!error) {
 108         pstream_set_bound_port(*pstreamp, htons(ss_get_port(&ss)));
 109     }
 110     return error;
 111 }
 112
 113 static int
 114 ptcp_open(const char *name OVS_UNUSED, char *suffix, struct pstream **pstreamp,
 115           uint8_t dscp)
 116 {
 117     return new_pstream(suffix, NULL, pstreamp, dscp, NULL, true);
 118 }
 119
 120 static int
 121 ptcp_accept(int fd, const struct sockaddr_storage *ss,
 122             size_t ss_len OVS_UNUSED, struct stream **streamp)
 123 {
 124     struct ds name = DS_EMPTY_INITIALIZER;
 125     ds_put_cstr(&name, "tcp:");
 126     ss_format_address(ss, &name);
 127     ds_put_format(&name, ":%"PRIu16, ss_get_port(ss));
 128
 129     return new_tcp_stream(ds_steal_cstr(&name), fd, 0, streamp);
 130 }
 131
 132 const struct pstream_class ptcp_pstream_class = {
 133     "ptcp",
 134     true,
 135     ptcp_open,
 136     NULL,
 137     NULL,
 138     NULL,
 139 };