2 * Copyright (c) 2012 The FreeBSD Foundation
5 * This software was developed by Edward Tomasz Napierala under sponsorship
6 * from the FreeBSD Foundation.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
34 #include <sys/types.h>
43 #include "iscsi_proto.h"
45 #ifdef ICL_KERNEL_PROXY
46 #include <sys/ioctl.h>
50 pdu_ahs_length(const struct pdu *pdu)
53 return (pdu->pdu_bhs->bhs_total_ahs_len * 4);
57 pdu_data_segment_length(const struct pdu *pdu)
61 len += pdu->pdu_bhs->bhs_data_segment_len[0];
63 len += pdu->pdu_bhs->bhs_data_segment_len[1];
65 len += pdu->pdu_bhs->bhs_data_segment_len[2];
71 pdu_set_data_segment_length(struct pdu *pdu, uint32_t len)
74 pdu->pdu_bhs->bhs_data_segment_len[2] = len;
75 pdu->pdu_bhs->bhs_data_segment_len[1] = len >> 8;
76 pdu->pdu_bhs->bhs_data_segment_len[0] = len >> 16;
80 pdu_new(struct connection *conn)
84 pdu = calloc(sizeof(*pdu), 1);
88 pdu->pdu_bhs = calloc(sizeof(*pdu->pdu_bhs), 1);
89 if (pdu->pdu_bhs == NULL)
92 pdu->pdu_connection = conn;
98 pdu_new_response(struct pdu *request)
101 return (pdu_new(request->pdu_connection));
104 #ifdef ICL_KERNEL_PROXY
107 pdu_receive_proxy(struct pdu *pdu)
109 struct iscsi_daemon_receive *idr;
113 assert(pdu->pdu_connection->conn_conf.isc_iser != 0);
115 pdu->pdu_data = malloc(ISCSI_MAX_DATA_SEGMENT_LENGTH);
116 if (pdu->pdu_data == NULL)
117 log_err(1, "malloc");
119 idr = calloc(1, sizeof(*idr));
121 log_err(1, "calloc");
123 idr->idr_session_id = pdu->pdu_connection->conn_session_id;
124 idr->idr_bhs = pdu->pdu_bhs;
125 idr->idr_data_segment_len = ISCSI_MAX_DATA_SEGMENT_LENGTH;
126 idr->idr_data_segment = pdu->pdu_data;
128 error = ioctl(pdu->pdu_connection->conn_iscsi_fd, ISCSIDRECEIVE, idr);
130 log_err(1, "ISCSIDRECEIVE");
132 len = pdu_ahs_length(pdu);
134 log_errx(1, "protocol error: non-empty AHS");
136 len = pdu_data_segment_length(pdu);
137 assert(len <= ISCSI_MAX_DATA_SEGMENT_LENGTH);
138 pdu->pdu_data_len = len;
144 pdu_send_proxy(struct pdu *pdu)
146 struct iscsi_daemon_send *ids;
149 assert(pdu->pdu_connection->conn_conf.isc_iser != 0);
151 pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
153 ids = calloc(1, sizeof(*ids));
155 log_err(1, "calloc");
157 ids->ids_session_id = pdu->pdu_connection->conn_session_id;
158 ids->ids_bhs = pdu->pdu_bhs;
159 ids->ids_data_segment_len = pdu->pdu_data_len;
160 ids->ids_data_segment = pdu->pdu_data;
162 error = ioctl(pdu->pdu_connection->conn_iscsi_fd, ISCSIDSEND, ids);
164 log_err(1, "ISCSIDSEND");
169 #endif /* ICL_KERNEL_PROXY */
172 pdu_padding(const struct pdu *pdu)
175 if ((pdu->pdu_data_len % 4) != 0)
176 return (4 - (pdu->pdu_data_len % 4));
182 pdu_read(int fd, char *data, size_t len)
187 ret = read(fd, data, len);
190 log_errx(1, "exiting due to timeout");
193 log_errx(1, "read: connection lost");
200 pdu_receive(struct pdu *pdu)
205 #ifdef ICL_KERNEL_PROXY
206 if (pdu->pdu_connection->conn_conf.isc_iser != 0)
207 return (pdu_receive_proxy(pdu));
210 assert(pdu->pdu_connection->conn_conf.isc_iser == 0);
212 pdu_read(pdu->pdu_connection->conn_socket,
213 (char *)pdu->pdu_bhs, sizeof(*pdu->pdu_bhs));
215 len = pdu_ahs_length(pdu);
217 log_errx(1, "protocol error: non-empty AHS");
219 len = pdu_data_segment_length(pdu);
221 if (len > ISCSI_MAX_DATA_SEGMENT_LENGTH) {
222 log_errx(1, "protocol error: received PDU "
223 "with DataSegmentLength exceeding %d",
224 ISCSI_MAX_DATA_SEGMENT_LENGTH);
227 pdu->pdu_data_len = len;
228 pdu->pdu_data = malloc(len);
229 if (pdu->pdu_data == NULL)
230 log_err(1, "malloc");
232 pdu_read(pdu->pdu_connection->conn_socket,
233 (char *)pdu->pdu_data, pdu->pdu_data_len);
235 padding = pdu_padding(pdu);
237 assert(padding < sizeof(dummy));
238 pdu_read(pdu->pdu_connection->conn_socket,
239 (char *)dummy, padding);
245 pdu_send(struct pdu *pdu)
247 ssize_t ret, total_len;
253 #ifdef ICL_KERNEL_PROXY
254 if (pdu->pdu_connection->conn_conf.isc_iser != 0)
255 return (pdu_send_proxy(pdu));
258 assert(pdu->pdu_connection->conn_conf.isc_iser == 0);
260 pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
261 iov[0].iov_base = pdu->pdu_bhs;
262 iov[0].iov_len = sizeof(*pdu->pdu_bhs);
263 total_len = iov[0].iov_len;
266 if (pdu->pdu_data_len > 0) {
267 iov[1].iov_base = pdu->pdu_data;
268 iov[1].iov_len = pdu->pdu_data_len;
269 total_len += iov[1].iov_len;
272 padding = pdu_padding(pdu);
274 assert(padding < sizeof(zero));
275 iov[2].iov_base = &zero;
276 iov[2].iov_len = padding;
277 total_len += iov[2].iov_len;
282 ret = writev(pdu->pdu_connection->conn_socket, iov, iovcnt);
285 log_errx(1, "exiting due to timeout");
286 log_err(1, "writev");
288 if (ret != total_len)
289 log_errx(1, "short write");
293 pdu_delete(struct pdu *pdu)