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
32 #include <sys/types.h>
41 #include "iscsi_proto.h"
43 #ifdef ICL_KERNEL_PROXY
44 #include <sys/ioctl.h>
48 pdu_ahs_length(const struct pdu *pdu)
51 return (pdu->pdu_bhs->bhs_total_ahs_len * 4);
55 pdu_data_segment_length(const struct pdu *pdu)
59 len += pdu->pdu_bhs->bhs_data_segment_len[0];
61 len += pdu->pdu_bhs->bhs_data_segment_len[1];
63 len += pdu->pdu_bhs->bhs_data_segment_len[2];
69 pdu_set_data_segment_length(struct pdu *pdu, uint32_t len)
72 pdu->pdu_bhs->bhs_data_segment_len[2] = len;
73 pdu->pdu_bhs->bhs_data_segment_len[1] = len >> 8;
74 pdu->pdu_bhs->bhs_data_segment_len[0] = len >> 16;
78 pdu_new(struct connection *conn)
82 pdu = calloc(sizeof(*pdu), 1);
86 pdu->pdu_bhs = calloc(sizeof(*pdu->pdu_bhs), 1);
87 if (pdu->pdu_bhs == NULL)
90 pdu->pdu_connection = conn;
96 pdu_new_response(struct pdu *request)
99 return (pdu_new(request->pdu_connection));
102 #ifdef ICL_KERNEL_PROXY
105 pdu_receive_proxy(struct pdu *pdu)
107 struct iscsi_daemon_receive *idr;
111 assert(pdu->pdu_connection->conn_conf.isc_iser != 0);
113 pdu->pdu_data = malloc(ISCSI_MAX_DATA_SEGMENT_LENGTH);
114 if (pdu->pdu_data == NULL)
115 log_err(1, "malloc");
117 idr = calloc(1, sizeof(*idr));
119 log_err(1, "calloc");
121 idr->idr_session_id = pdu->pdu_connection->conn_session_id;
122 idr->idr_bhs = pdu->pdu_bhs;
123 idr->idr_data_segment_len = ISCSI_MAX_DATA_SEGMENT_LENGTH;
124 idr->idr_data_segment = pdu->pdu_data;
126 error = ioctl(pdu->pdu_connection->conn_iscsi_fd, ISCSIDRECEIVE, idr);
128 log_err(1, "ISCSIDRECEIVE");
130 len = pdu_ahs_length(pdu);
132 log_errx(1, "protocol error: non-empty AHS");
134 len = pdu_data_segment_length(pdu);
135 assert(len <= ISCSI_MAX_DATA_SEGMENT_LENGTH);
136 pdu->pdu_data_len = len;
142 pdu_send_proxy(struct pdu *pdu)
144 struct iscsi_daemon_send *ids;
147 assert(pdu->pdu_connection->conn_conf.isc_iser != 0);
149 pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
151 ids = calloc(1, sizeof(*ids));
153 log_err(1, "calloc");
155 ids->ids_session_id = pdu->pdu_connection->conn_session_id;
156 ids->ids_bhs = pdu->pdu_bhs;
157 ids->ids_data_segment_len = pdu->pdu_data_len;
158 ids->ids_data_segment = pdu->pdu_data;
160 error = ioctl(pdu->pdu_connection->conn_iscsi_fd, ISCSIDSEND, ids);
162 log_err(1, "ISCSIDSEND");
167 #endif /* ICL_KERNEL_PROXY */
170 pdu_padding(const struct pdu *pdu)
173 if ((pdu->pdu_data_len % 4) != 0)
174 return (4 - (pdu->pdu_data_len % 4));
180 pdu_read(int fd, char *data, size_t len)
185 ret = read(fd, data, len);
188 log_errx(1, "exiting due to timeout");
191 log_errx(1, "read: connection lost");
198 pdu_receive(struct pdu *pdu)
203 #ifdef ICL_KERNEL_PROXY
204 if (pdu->pdu_connection->conn_conf.isc_iser != 0)
205 return (pdu_receive_proxy(pdu));
208 assert(pdu->pdu_connection->conn_conf.isc_iser == 0);
210 pdu_read(pdu->pdu_connection->conn_socket,
211 (char *)pdu->pdu_bhs, sizeof(*pdu->pdu_bhs));
213 len = pdu_ahs_length(pdu);
215 log_errx(1, "protocol error: non-empty AHS");
217 len = pdu_data_segment_length(pdu);
219 if (len > ISCSI_MAX_DATA_SEGMENT_LENGTH) {
220 log_errx(1, "protocol error: received PDU "
221 "with DataSegmentLength exceeding %d",
222 ISCSI_MAX_DATA_SEGMENT_LENGTH);
225 pdu->pdu_data_len = len;
226 pdu->pdu_data = malloc(len);
227 if (pdu->pdu_data == NULL)
228 log_err(1, "malloc");
230 pdu_read(pdu->pdu_connection->conn_socket,
231 (char *)pdu->pdu_data, pdu->pdu_data_len);
233 padding = pdu_padding(pdu);
235 assert(padding < sizeof(dummy));
236 pdu_read(pdu->pdu_connection->conn_socket,
237 (char *)dummy, padding);
243 pdu_send(struct pdu *pdu)
245 ssize_t ret, total_len;
251 #ifdef ICL_KERNEL_PROXY
252 if (pdu->pdu_connection->conn_conf.isc_iser != 0)
253 return (pdu_send_proxy(pdu));
256 assert(pdu->pdu_connection->conn_conf.isc_iser == 0);
258 pdu_set_data_segment_length(pdu, pdu->pdu_data_len);
259 iov[0].iov_base = pdu->pdu_bhs;
260 iov[0].iov_len = sizeof(*pdu->pdu_bhs);
261 total_len = iov[0].iov_len;
264 if (pdu->pdu_data_len > 0) {
265 iov[1].iov_base = pdu->pdu_data;
266 iov[1].iov_len = pdu->pdu_data_len;
267 total_len += iov[1].iov_len;
270 padding = pdu_padding(pdu);
272 assert(padding < sizeof(zero));
273 iov[2].iov_base = &zero;
274 iov[2].iov_len = padding;
275 total_len += iov[2].iov_len;
280 ret = writev(pdu->pdu_connection->conn_socket, iov, iovcnt);
283 log_errx(1, "exiting due to timeout");
284 log_err(1, "writev");
286 if (ret != total_len)
287 log_errx(1, "short write");
291 pdu_delete(struct pdu *pdu)