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