Shad Ansari | 2f7f9be | 2017-06-07 13:34:53 -0700 | [diff] [blame] | 1 | /* |
| 2 | <:copyright-BRCM:2016:DUAL/GPL:standard |
| 3 | |
| 4 | Broadcom Proprietary and Confidential.(c) 2016 Broadcom |
| 5 | All Rights Reserved |
| 6 | |
| 7 | Unless you and Broadcom execute a separate written software license |
| 8 | agreement governing use of this software, this software is licensed |
| 9 | to you under the terms of the GNU General Public License version 2 |
| 10 | (the "GPL"), available at http://www.broadcom.com/licenses/GPLv2.php, |
| 11 | with the following added to such license: |
| 12 | |
| 13 | As a special exception, the copyright holders of this software give |
| 14 | you permission to link this software with independent modules, and |
| 15 | to copy and distribute the resulting executable under terms of your |
| 16 | choice, provided that you also meet, for each linked independent |
| 17 | module, the terms and conditions of the license of that module. |
| 18 | An independent module is a module which is not derived from this |
| 19 | software. The special exception does not apply to any modifications |
| 20 | of the software. |
| 21 | |
| 22 | Not withstanding the above, under no circumstances may you combine |
| 23 | this software in any way with any other Broadcom software provided |
| 24 | under a license other than the GPL, without Broadcom's express prior |
| 25 | written consent. |
| 26 | |
| 27 | :> |
| 28 | */ |
| 29 | |
| 30 | #include <bcmos_system.h> |
| 31 | |
| 32 | #include <sys/socket.h> |
| 33 | #include <sys/types.h> |
| 34 | #include <netinet/in.h> |
| 35 | |
| 36 | #include <bcmtr_plugin.h> |
| 37 | #include <bcm_config.h> |
| 38 | |
| 39 | /* Last seen host IP and port */ |
| 40 | static struct sockaddr_in peer_sa[BCMTR_MAX_OLTS]; |
| 41 | |
| 42 | /* This plugin stores both device id and per-device socket handle in |
| 43 | * transport's channel_id handle as |
| 44 | * (device_id << 24) | socket_handle. |
| 45 | * The following functions recover socket_handle and device_id from the channel_id handle |
| 46 | */ |
| 47 | |
| 48 | static inline int _bcmtr_channel_to_socket(bcmtr_plugin_channel ch) |
| 49 | { |
| 50 | return (int)(ch & 0xffffff); |
| 51 | } |
| 52 | |
| 53 | static inline int _bcmtr_channel_to_device(bcmtr_plugin_channel ch) |
| 54 | { |
| 55 | return (int)((ch >> 24) & 0xff); |
| 56 | } |
| 57 | |
| 58 | /** Open communication channel */ |
| 59 | static bcmos_errno bcmtr_udp_open(int device, bcmtr_plugin_cfg *cfg, bcmtr_plugin_channel *ch) |
| 60 | { |
| 61 | struct sockaddr_in sa = {}; |
| 62 | struct timeval timeout = { .tv_sec = 0, .tv_usec = BCMTR_MSG_TIMEOUT * 1000 }; |
| 63 | int s; |
| 64 | |
| 65 | s = socket(AF_INET, SOCK_DGRAM, 0); |
| 66 | if (s < 0) |
| 67 | { |
| 68 | BCMOS_TRACE_RETURN(BCM_ERR_COMM_FAIL, "Can't create UDP socket\n"); |
| 69 | } |
| 70 | |
| 71 | /* Bind local */ |
| 72 | sa.sin_family = AF_INET; |
| 73 | sa.sin_port = htons(cfg->x.udp.my_port); |
| 74 | sa.sin_addr.s_addr = INADDR_ANY; |
| 75 | if (bind(s, (struct sockaddr*)&sa, sizeof(sa) ) == -1) |
| 76 | { |
| 77 | close(s); |
| 78 | perror("bind"); |
| 79 | BCMOS_TRACE_RETURN(BCM_ERR_COMM_FAIL, "Can't bind UDP socket to %d.%d.%d.%d:%d\n", |
| 80 | (int)(cfg->x.udp.my_ip >> 24), (int)((cfg->x.udp.my_ip >> 16) & 0xff), |
| 81 | (int)((cfg->x.udp.my_ip >> 8) & 0xff), (int)(cfg->x.udp.my_ip & 0xff), |
| 82 | (int)cfg->x.udp.my_port); |
| 83 | } |
| 84 | bcmos_printf("%s: socket bound to port %d\n", __FUNCTION__, (int)cfg->x.udp.my_port); |
| 85 | |
| 86 | if (setsockopt(s, SOL_SOCKET, SO_SNDTIMEO, (char *)&timeout, sizeof(timeout)) < 0) |
| 87 | { |
| 88 | BCMOS_TRACE_RETURN(BCM_ERR_COMM_FAIL, "Can't set socket option for send timeout\n"); |
| 89 | } |
| 90 | |
| 91 | /* Connect to remote */ |
| 92 | if (cfg->x.udp.remote_port) |
| 93 | { |
| 94 | peer_sa[device].sin_family = AF_INET; |
| 95 | peer_sa[device].sin_port = htons(cfg->x.udp.remote_port); |
| 96 | peer_sa[device].sin_addr.s_addr = htonl(cfg->x.udp.remote_ip); |
| 97 | } |
| 98 | *ch = (device << 24) | s; |
| 99 | |
| 100 | return BCM_ERR_OK; |
| 101 | } |
| 102 | |
| 103 | /* print error message with throttling: not oftener than ones per second */ |
| 104 | static void _bcmtr_udp_print_err(bcmos_errno err, const char *err_msg) |
| 105 | { |
| 106 | static int nerrors; |
| 107 | static uint32_t last_timestamp; |
| 108 | |
| 109 | ++nerrors; |
| 110 | |
| 111 | if (!last_timestamp || bcmos_timestamp() - last_timestamp > 1000000) |
| 112 | { |
| 113 | BCMOS_TRACE_ERR("Error in low-level UDP transport. %s-%s. Errors since last report: %d\n", |
| 114 | err_msg, bcmos_strerror(err), nerrors); |
| 115 | last_timestamp = bcmos_timestamp(); |
| 116 | nerrors = 0; |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | /** Close communication channel */ |
| 121 | static bcmos_errno bcmtr_udp_close(bcmtr_plugin_channel ch) |
| 122 | { |
| 123 | close(_bcmtr_channel_to_socket(ch)); |
| 124 | return BCM_ERR_OK; |
| 125 | } |
| 126 | |
| 127 | /** Send data */ |
| 128 | static bcmos_errno bcmtr_udp_send(bcmtr_plugin_channel ch, bcmolt_subchannel subch, bcmolt_buf *buf, |
| 129 | bcmtr_send_flags flags) |
| 130 | { |
| 131 | int sock = _bcmtr_channel_to_socket(ch); |
| 132 | int device = _bcmtr_channel_to_device(ch); |
| 133 | int buflen = bcmolt_buf_get_used(buf); |
| 134 | struct iovec iov = { .iov_base = buf->start, .iov_len = buflen }; |
| 135 | struct msghdr msg = { |
| 136 | .msg_iov = &iov, .msg_iovlen = 1, .msg_flags = 0, |
| 137 | .msg_name = (void *)&peer_sa[device], .msg_namelen = sizeof(peer_sa[0]) |
| 138 | }; |
| 139 | int len; |
| 140 | |
| 141 | len = sendmsg(sock, &msg, 0); |
| 142 | if (len < buflen) |
| 143 | { |
| 144 | bcmos_printf("%s: sock_sendmsg(%u) --> %d. errno=%d\n", __FUNCTION__, buflen, len, errno); |
| 145 | return BCM_ERR_COMM_FAIL; |
| 146 | } |
| 147 | |
| 148 | return BCM_ERR_OK; |
| 149 | } |
| 150 | |
| 151 | /** Receive data */ |
| 152 | static bcmos_errno bcmtr_udp_recv(bcmtr_plugin_channel ch, bcmolt_subchannel *subch, bcmolt_buf *buf) |
| 153 | { |
| 154 | int sock = _bcmtr_channel_to_socket(ch); |
| 155 | int device = _bcmtr_channel_to_device(ch); |
| 156 | struct iovec iov; |
| 157 | struct msghdr msg = { |
| 158 | .msg_iov = &iov, .msg_iovlen = 1, |
| 159 | .msg_name = (void *)&peer_sa[device], .msg_namelen = sizeof(peer_sa[0]) |
| 160 | }; |
| 161 | int len; |
| 162 | fd_set read_fds; |
| 163 | struct timeval tv; |
| 164 | bcmos_errno err; |
| 165 | int rc; |
| 166 | |
| 167 | FD_ZERO(&read_fds); |
| 168 | FD_SET(sock, &read_fds); |
| 169 | tv.tv_sec = 0; |
| 170 | tv.tv_usec = BCMTR_MSG_TIMEOUT * 1000; |
| 171 | |
| 172 | rc = select(sock + 1, &read_fds, NULL, NULL, &tv); |
| 173 | if (rc < 0) |
| 174 | { |
| 175 | perror("select"); |
| 176 | return BCM_ERR_COMM_FAIL; |
| 177 | } |
| 178 | if (!rc || !FD_ISSET(sock, &read_fds)) |
| 179 | { |
| 180 | return BCM_ERR_TIMEOUT; |
| 181 | } |
| 182 | |
| 183 | err = bcmolt_buf_alloc(buf, BCMTR_MAX_MTU_SIZE, BCMOLT_BUF_ENDIAN_FIXED); |
| 184 | if (err) |
| 185 | return BCM_ERR_NOMEM; |
| 186 | |
| 187 | iov.iov_base = buf->start; |
| 188 | iov.iov_len = BCMTR_MAX_MTU_SIZE; |
| 189 | len = recvmsg(sock, &msg, 0); |
| 190 | if (len <= 0) |
| 191 | { |
| 192 | _bcmtr_udp_print_err(BCM_ERR_COMM_FAIL, "recvmsg() failed\n"); |
| 193 | bcmolt_buf_free(buf); |
| 194 | return BCM_ERR_COMM_FAIL; |
| 195 | } |
| 196 | buf->len = len; |
| 197 | *subch = ntohs(peer_sa[device].sin_port); |
| 198 | |
| 199 | return BCM_ERR_OK; |
| 200 | } |
| 201 | |
| 202 | /** Initialize plugin callbacks |
| 203 | * \param[in,out] driver Transport plugin driver structure |
| 204 | * \return error code |
| 205 | */ |
| 206 | bcmos_errno bcmtr_plugin_init(bcmtr_plugin_cfg *cfg, bcmtr_driver *driver) |
| 207 | { |
| 208 | if (cfg->type != BCMTR_TYPE_UDP) |
| 209 | { |
| 210 | BCMOS_TRACE_RETURN(BCM_ERR_PARM, "Invalid plugin type. Expected UDP\n"); |
| 211 | } |
| 212 | |
| 213 | driver->open = bcmtr_udp_open; |
| 214 | driver->close = bcmtr_udp_close; |
| 215 | driver->recv = bcmtr_udp_recv; |
| 216 | driver->send = bcmtr_udp_send; |
| 217 | |
| 218 | return BCM_ERR_OK; |
| 219 | } |
| 220 | |