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 static int
  41 new_tcp_stream(const char *name, int fd, int connect_status,
  42                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, 0, NULL, &fd, dscp);
  57     if (fd >= 0) {
  58         return new_tcp_stream(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     char bound_name[SS_NTOP_BUFSIZE + 16];
  88     char addrbuf[SS_NTOP_BUFSIZE];
  89     struct sockaddr_storage ss;
  90     int error;
  91     uint16_t port;
  92     int fd;
  93     char *conn_name = CONST_CAST(char *, name);
  94
  95     fd = inet_open_passive(SOCK_STREAM, suffix, -1, &ss, dscp,
  96                            kernel_print_port);
  97     if (fd < 0) {
  98         return -fd;
  99     }
 100
 101     port = ss_get_port(&ss);
 102     if (!conn_name) {
 103         snprintf(bound_name, sizeof bound_name, "ptcp:%"PRIu16":%s",
 104                  port, ss_format_address(&ss, addrbuf, sizeof addrbuf));
 105         conn_name = bound_name;
 106     }
 107
 108     error = new_fd_pstream(conn_name, fd, ptcp_accept, unlink_path, pstreamp);
 109     if (!error) {
 110         pstream_set_bound_port(*pstreamp, htons(port));
 111     }
 112     return error;
 113 }
 114
 115 static int
 116 ptcp_open(const char *name OVS_UNUSED, char *suffix, struct pstream **pstreamp,
 117           uint8_t dscp)
 118 {
 119     return new_pstream(suffix, NULL, pstreamp, dscp, NULL, true);
 120 }
 121
 122 static int
 123 ptcp_accept(int fd, const struct sockaddr_storage *ss,
 124             size_t ss_len OVS_UNUSED, struct stream **streamp)
 125 {
 126     char name[SS_NTOP_BUFSIZE + 16];
 127     char addrbuf[SS_NTOP_BUFSIZE];
 128
 129     snprintf(name, sizeof name, "tcp:%s:%"PRIu16,
 130              ss_format_address(ss, addrbuf, sizeof addrbuf),
 131              ss_get_port(ss));
 132     return new_tcp_stream(name, fd, 0, streamp);
 133 }
 134
 135 const struct pstream_class ptcp_pstream_class = {
 136     "ptcp",
 137     true,
 138     ptcp_open,
 139     NULL,
 140     NULL,
 141     NULL,
 142 };