lib/stream-tcp.c

   1 /*
   2  * Copyright (c) 2008, 2009, 2010 Nicira Networks.
   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 <netinet/tcp.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/socket.h>
  27 #include <unistd.h>
  28 #include "packets.h"
  29 #include "socket-util.h"
  30 #include "util.h"
  31 #include "stream-provider.h"
  32 #include "stream-fd.h"
  33 #include "vlog.h"
  34
  35 VLOG_DEFINE_THIS_MODULE(stream_tcp);
  36
  37 /* Active TCP. */
  38
  39 static int
  40 new_tcp_stream(const char *name, int fd, int connect_status,
  41               const struct sockaddr_in *remote, struct stream **streamp)
  42 {
  43     struct sockaddr_in local;
  44     socklen_t local_len = sizeof local;
  45     int on = 1;
  46     int retval;
  47
  48     /* Get the local IP and port information */
  49     retval = getsockname(fd, (struct sockaddr *)&local, &local_len);
  50     if (retval) {
  51         memset(&local, 0, sizeof local);
  52     }
  53
  54     retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
  55     if (retval) {
  56         VLOG_ERR("%s: setsockopt(TCP_NODELAY): %s", name, strerror(errno));
  57         close(fd);
  58         return errno;
  59     }
  60
  61     retval = new_fd_stream(name, fd, connect_status, NULL, streamp);
  62     if (!retval) {
  63         struct stream *stream = *streamp;
  64         stream_set_remote_ip(stream, remote->sin_addr.s_addr);
  65         stream_set_remote_port(stream, remote->sin_port);
  66         stream_set_local_ip(stream, local.sin_addr.s_addr);
  67         stream_set_local_port(stream, local.sin_port);
  68     }
  69     return retval;
  70 }
  71
  72 static int
  73 tcp_open(const char *name, char *suffix, struct stream **streamp)
  74 {
  75     struct sockaddr_in sin;
  76     int fd, error;
  77
  78     error = inet_open_active(SOCK_STREAM, suffix, 0, &sin, &fd);
  79     if (fd >= 0) {
  80         return new_tcp_stream(name, fd, error, &sin, streamp);
  81     } else {
  82         VLOG_ERR("%s: connect: %s", name, strerror(error));
  83         return error;
  84     }
  85 }
  86
  87 const struct stream_class tcp_stream_class = {
  88     "tcp",                      /* name */
  89     tcp_open,                   /* open */
  90     NULL,                       /* close */
  91     NULL,                       /* connect */
  92     NULL,                       /* recv */
  93     NULL,                       /* send */
  94     NULL,                       /* run */
  95     NULL,                       /* run_wait */
  96     NULL,                       /* wait */
  97 };
  98 \f
  99 /* Passive TCP. */
 100
 101 static int ptcp_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 102                        struct stream **streamp);
 103
 104 static int
 105 ptcp_open(const char *name OVS_UNUSED, char *suffix, struct pstream **pstreamp)
 106 {
 107     struct sockaddr_in sin;
 108     char bound_name[128];
 109     int fd;
 110
 111     fd = inet_open_passive(SOCK_STREAM, suffix, -1, &sin);
 112     if (fd < 0) {
 113         return -fd;
 114     }
 115
 116     sprintf(bound_name, "ptcp:%"PRIu16":"IP_FMT,
 117             ntohs(sin.sin_port), IP_ARGS(&sin.sin_addr.s_addr));
 118     return new_fd_pstream(bound_name, fd, ptcp_accept, NULL, pstreamp);
 119 }
 120
 121 static int
 122 ptcp_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 123             struct stream **streamp)
 124 {
 125     const struct sockaddr_in *sin = (const struct sockaddr_in *) sa;
 126     char name[128];
 127
 128     if (sa_len == sizeof(struct sockaddr_in) && sin->sin_family == AF_INET) {
 129         sprintf(name, "tcp:"IP_FMT, IP_ARGS(&sin->sin_addr));
 130         sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin->sin_port));
 131     } else {
 132         strcpy(name, "tcp");
 133     }
 134     return new_tcp_stream(name, fd, 0, sin, streamp);
 135 }
 136
 137 const struct pstream_class ptcp_pstream_class = {
 138     "ptcp",
 139     ptcp_open,
 140     NULL,
 141     NULL,
 142     NULL
 143 };
 144