lib/vconn-tcp.c

   1 /*
   2  * Copyright (c) 2008, 2009 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 "vconn.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 "openflow/openflow.h"
  31 #include "vconn-provider.h"
  32 #include "vconn-stream.h"
  33
  34 #include "vlog.h"
  35 #define THIS_MODULE VLM_vconn_tcp
  36
  37 /* Active TCP. */
  38
  39 static int
  40 new_tcp_vconn(const char *name, int fd, int connect_status,
  41               const struct sockaddr_in *sin, struct vconn **vconnp)
  42 {
  43     int on = 1;
  44     int retval;
  45
  46     retval = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &on, sizeof on);
  47     if (retval) {
  48         VLOG_ERR("%s: setsockopt(TCP_NODELAY): %s", name, strerror(errno));
  49         close(fd);
  50         return errno;
  51     }
  52
  53     return new_stream_vconn(name, fd, connect_status, sin->sin_addr.s_addr,
  54                             true, vconnp);
  55 }
  56
  57 static int
  58 tcp_open(const char *name, char *suffix, struct vconn **vconnp)
  59 {
  60     char *save_ptr;
  61     const char *host_name;
  62     const char *port_string;
  63     struct sockaddr_in sin;
  64     int retval;
  65     int fd;
  66
  67     host_name = strtok_r(suffix, ":", &save_ptr);
  68     port_string = strtok_r(NULL, ":", &save_ptr);
  69     if (!host_name) {
  70         ovs_error(0, "%s: bad peer name format", name);
  71         return EAFNOSUPPORT;
  72     }
  73
  74     memset(&sin, 0, sizeof sin);
  75     sin.sin_family = AF_INET;
  76     if (lookup_ip(host_name, &sin.sin_addr)) {
  77         return ENOENT;
  78     }
  79     sin.sin_port = htons(port_string ? atoi(port_string) : OFP_TCP_PORT);
  80
  81     fd = socket(AF_INET, SOCK_STREAM, 0);
  82     if (fd < 0) {
  83         VLOG_ERR("%s: socket: %s", name, strerror(errno));
  84         return errno;
  85     }
  86
  87     retval = set_nonblocking(fd);
  88     if (retval) {
  89         close(fd);
  90         return retval;
  91     }
  92
  93     retval = connect(fd, (struct sockaddr *) &sin, sizeof sin);
  94     if (retval < 0) {
  95         if (errno == EINPROGRESS) {
  96             return new_tcp_vconn(name, fd, EAGAIN, &sin, vconnp);
  97         } else {
  98             int error = errno;
  99             VLOG_ERR("%s: connect: %s", name, strerror(error));
 100             close(fd);
 101             return error;
 102         }
 103     } else {
 104         return new_tcp_vconn(name, fd, 0, &sin, vconnp);
 105     }
 106 }
 107
 108 struct vconn_class tcp_vconn_class = {
 109     "tcp",                      /* name */
 110     tcp_open,                   /* open */
 111     NULL,                       /* close */
 112     NULL,                       /* connect */
 113     NULL,                       /* recv */
 114     NULL,                       /* send */
 115     NULL,                       /* wait */
 116 };
 117 \f
 118 /* Passive TCP. */
 119
 120 static int ptcp_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 121                        struct vconn **vconnp);
 122
 123 static int
 124 ptcp_open(const char *name, char *suffix, struct pvconn **pvconnp)
 125 {
 126     struct sockaddr_in sin;
 127     int retval;
 128     int fd;
 129     unsigned int yes  = 1;
 130
 131     fd = socket(AF_INET, SOCK_STREAM, 0);
 132     if (fd < 0) {
 133         VLOG_ERR("%s: socket: %s", name, strerror(errno));
 134         return errno;
 135     }
 136
 137     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) {
 138         VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s", name, strerror(errno));
 139         return errno;
 140     }
 141
 142     memset(&sin, 0, sizeof sin);
 143     sin.sin_family = AF_INET;
 144     sin.sin_addr.s_addr = htonl(INADDR_ANY);
 145     sin.sin_port = htons(atoi(suffix) ? atoi(suffix) : OFP_TCP_PORT);
 146     retval = bind(fd, (struct sockaddr *) &sin, sizeof sin);
 147     if (retval < 0) {
 148         int error = errno;
 149         VLOG_ERR("%s: bind: %s", name, strerror(error));
 150         close(fd);
 151         return error;
 152     }
 153
 154     return new_pstream_pvconn("ptcp", fd, ptcp_accept, pvconnp);
 155 }
 156
 157 static int
 158 ptcp_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 159             struct vconn **vconnp)
 160 {
 161     const struct sockaddr_in *sin = (const struct sockaddr_in *) sa;
 162     char name[128];
 163
 164     if (sa_len == sizeof(struct sockaddr_in) && sin->sin_family == AF_INET) {
 165         sprintf(name, "tcp:"IP_FMT, IP_ARGS(&sin->sin_addr));
 166         if (sin->sin_port != htons(OFP_TCP_PORT)) {
 167             sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin->sin_port));
 168         }
 169     } else {
 170         strcpy(name, "tcp");
 171     }
 172     return new_tcp_vconn(name, fd, 0, sin, vconnp);
 173 }
 174
 175 struct pvconn_class ptcp_pvconn_class = {
 176     "ptcp",
 177     ptcp_open,
 178     NULL,
 179     NULL,
 180     NULL
 181 };
 182