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 *remote, struct vconn **vconnp)
  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_stream_vconn(name, fd, connect_status, true, vconnp);
  62     if (!retval) {
  63         struct vconn *vconn = *vconnp;
  64         vconn_set_remote_ip(vconn, remote->sin_addr.s_addr);
  65         vconn_set_remote_port(vconn, remote->sin_port);
  66         vconn_set_local_ip(vconn, local.sin_addr.s_addr);
  67         vconn_set_local_port(vconn, local.sin_port);
  68     }
  69     return retval;
  70 }
  71
  72 static int
  73 tcp_open(const char *name, char *suffix, struct vconn **vconnp)
  74 {
  75     char *save_ptr = NULL;
  76     const char *host_name;
  77     const char *port_string;
  78     struct sockaddr_in sin;
  79     int retval;
  80     int fd;
  81
  82     host_name = strtok_r(suffix, ":", &save_ptr);
  83     port_string = strtok_r(NULL, ":", &save_ptr);
  84     if (!host_name) {
  85         ovs_error(0, "%s: bad peer name format", name);
  86         return EAFNOSUPPORT;
  87     }
  88
  89     memset(&sin, 0, sizeof sin);
  90     sin.sin_family = AF_INET;
  91     if (lookup_ip(host_name, &sin.sin_addr)) {
  92         return ENOENT;
  93     }
  94     sin.sin_port = htons(port_string ? atoi(port_string) : OFP_TCP_PORT);
  95
  96     fd = socket(AF_INET, SOCK_STREAM, 0);
  97     if (fd < 0) {
  98         VLOG_ERR("%s: socket: %s", name, strerror(errno));
  99         return errno;
 100     }
 101
 102     retval = set_nonblocking(fd);
 103     if (retval) {
 104         close(fd);
 105         return retval;
 106     }
 107
 108     retval = connect(fd, (struct sockaddr *) &sin, sizeof sin);
 109     if (retval < 0) {
 110         if (errno == EINPROGRESS) {
 111             return new_tcp_vconn(name, fd, EAGAIN, &sin, vconnp);
 112         } else {
 113             int error = errno;
 114             VLOG_ERR("%s: connect: %s", name, strerror(error));
 115             close(fd);
 116             return error;
 117         }
 118     } else {
 119         return new_tcp_vconn(name, fd, 0, &sin, vconnp);
 120     }
 121 }
 122
 123 struct vconn_class tcp_vconn_class = {
 124     "tcp",                      /* name */
 125     tcp_open,                   /* open */
 126     NULL,                       /* close */
 127     NULL,                       /* connect */
 128     NULL,                       /* recv */
 129     NULL,                       /* send */
 130     NULL,                       /* wait */
 131 };
 132 \f
 133 /* Passive TCP. */
 134
 135 static int ptcp_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 136                        struct vconn **vconnp);
 137
 138 static int
 139 ptcp_open(const char *name, char *suffix, struct pvconn **pvconnp)
 140 {
 141     struct sockaddr_in sin;
 142     int retval;
 143     int fd;
 144     unsigned int yes  = 1;
 145
 146     fd = socket(AF_INET, SOCK_STREAM, 0);
 147     if (fd < 0) {
 148         VLOG_ERR("%s: socket: %s", name, strerror(errno));
 149         return errno;
 150     }
 151
 152     if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0) {
 153         VLOG_ERR("%s: setsockopt(SO_REUSEADDR): %s", name, strerror(errno));
 154         return errno;
 155     }
 156
 157     memset(&sin, 0, sizeof sin);
 158     sin.sin_family = AF_INET;
 159     sin.sin_addr.s_addr = htonl(INADDR_ANY);
 160     sin.sin_port = htons(atoi(suffix) ? atoi(suffix) : OFP_TCP_PORT);
 161     retval = bind(fd, (struct sockaddr *) &sin, sizeof sin);
 162     if (retval < 0) {
 163         int error = errno;
 164         VLOG_ERR("%s: bind: %s", name, strerror(error));
 165         close(fd);
 166         return error;
 167     }
 168
 169     return new_pstream_pvconn("ptcp", fd, ptcp_accept, pvconnp);
 170 }
 171
 172 static int
 173 ptcp_accept(int fd, const struct sockaddr *sa, size_t sa_len,
 174             struct vconn **vconnp)
 175 {
 176     const struct sockaddr_in *sin = (const struct sockaddr_in *) sa;
 177     char name[128];
 178
 179     if (sa_len == sizeof(struct sockaddr_in) && sin->sin_family == AF_INET) {
 180         sprintf(name, "tcp:"IP_FMT, IP_ARGS(&sin->sin_addr));
 181         if (sin->sin_port != htons(OFP_TCP_PORT)) {
 182             sprintf(strchr(name, '\0'), ":%"PRIu16, ntohs(sin->sin_port));
 183         }
 184     } else {
 185         strcpy(name, "tcp");
 186     }
 187     return new_tcp_vconn(name, fd, 0, sin, vconnp);
 188 }
 189
 190 struct pvconn_class ptcp_pvconn_class = {
 191     "ptcp",
 192     ptcp_open,
 193     NULL,
 194     NULL,
 195     NULL
 196 };
 197