xref: /linux/net/tipc/msg.c (revision 26b0d14106954ae46d2f4f7eec3481828a210f7d)
1 /*
2  * net/tipc/msg.c: TIPC message header routines
3  *
4  * Copyright (c) 2000-2006, Ericsson AB
5  * Copyright (c) 2005, 2010-2011, Wind River Systems
6  * All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions are met:
10  *
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.
16  * 3. Neither the names of the copyright holders nor the names of its
17  *    contributors may be used to endorse or promote products derived from
18  *    this software without specific prior written permission.
19  *
20  * Alternatively, this software may be distributed under the terms of the
21  * GNU General Public License ("GPL") version 2 as published by the Free
22  * Software Foundation.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
25  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
28  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
29  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
30  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
31  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
32  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
33  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
34  * POSSIBILITY OF SUCH DAMAGE.
35  */
36 
37 #include "core.h"
38 #include "msg.h"
39 
40 u32 tipc_msg_tot_importance(struct tipc_msg *m)
41 {
42 	if (likely(msg_isdata(m))) {
43 		if (likely(msg_orignode(m) == tipc_own_addr))
44 			return msg_importance(m);
45 		return msg_importance(m) + 4;
46 	}
47 	if ((msg_user(m) == MSG_FRAGMENTER)  &&
48 	    (msg_type(m) == FIRST_FRAGMENT))
49 		return msg_importance(msg_get_wrapped(m));
50 	return msg_importance(m);
51 }
52 
53 
54 void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
55 			    u32 hsize, u32 destnode)
56 {
57 	memset(m, 0, hsize);
58 	msg_set_version(m);
59 	msg_set_user(m, user);
60 	msg_set_hdr_sz(m, hsize);
61 	msg_set_size(m, hsize);
62 	msg_set_prevnode(m, tipc_own_addr);
63 	msg_set_type(m, type);
64 	msg_set_orignode(m, tipc_own_addr);
65 	msg_set_destnode(m, destnode);
66 }
67 
68 /**
69  * tipc_msg_build - create message using specified header and data
70  *
71  * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
72  *
73  * Returns message data size or errno
74  */
75 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
76 		   u32 num_sect, unsigned int total_len,
77 			    int max_size, int usrmem, struct sk_buff **buf)
78 {
79 	int dsz, sz, hsz, pos, res, cnt;
80 
81 	dsz = total_len;
82 	pos = hsz = msg_hdr_sz(hdr);
83 	sz = hsz + dsz;
84 	msg_set_size(hdr, sz);
85 	if (unlikely(sz > max_size)) {
86 		*buf = NULL;
87 		return dsz;
88 	}
89 
90 	*buf = tipc_buf_acquire(sz);
91 	if (!(*buf))
92 		return -ENOMEM;
93 	skb_copy_to_linear_data(*buf, hdr, hsz);
94 	for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
95 		if (likely(usrmem))
96 			res = !copy_from_user((*buf)->data + pos,
97 					      msg_sect[cnt].iov_base,
98 					      msg_sect[cnt].iov_len);
99 		else
100 			skb_copy_to_linear_data_offset(*buf, pos,
101 						       msg_sect[cnt].iov_base,
102 						       msg_sect[cnt].iov_len);
103 		pos += msg_sect[cnt].iov_len;
104 	}
105 	if (likely(res))
106 		return dsz;
107 
108 	kfree_skb(*buf);
109 	*buf = NULL;
110 	return -EFAULT;
111 }
112 
113 #ifdef CONFIG_TIPC_DEBUG
114 void tipc_msg_dbg(struct print_buf *buf, struct tipc_msg *msg, const char *str)
115 {
116 	u32 usr = msg_user(msg);
117 	tipc_printf(buf, KERN_DEBUG);
118 	tipc_printf(buf, str);
119 
120 	switch (usr) {
121 	case MSG_BUNDLER:
122 		tipc_printf(buf, "BNDL::");
123 		tipc_printf(buf, "MSGS(%u):", msg_msgcnt(msg));
124 		break;
125 	case BCAST_PROTOCOL:
126 		tipc_printf(buf, "BCASTP::");
127 		break;
128 	case MSG_FRAGMENTER:
129 		tipc_printf(buf, "FRAGM::");
130 		switch (msg_type(msg)) {
131 		case FIRST_FRAGMENT:
132 			tipc_printf(buf, "FIRST:");
133 			break;
134 		case FRAGMENT:
135 			tipc_printf(buf, "BODY:");
136 			break;
137 		case LAST_FRAGMENT:
138 			tipc_printf(buf, "LAST:");
139 			break;
140 		default:
141 			tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
142 
143 		}
144 		tipc_printf(buf, "NO(%u/%u):", msg_long_msgno(msg),
145 			    msg_fragm_no(msg));
146 		break;
147 	case TIPC_LOW_IMPORTANCE:
148 	case TIPC_MEDIUM_IMPORTANCE:
149 	case TIPC_HIGH_IMPORTANCE:
150 	case TIPC_CRITICAL_IMPORTANCE:
151 		tipc_printf(buf, "DAT%u:", msg_user(msg));
152 		if (msg_short(msg)) {
153 			tipc_printf(buf, "CON:");
154 			break;
155 		}
156 		switch (msg_type(msg)) {
157 		case TIPC_CONN_MSG:
158 			tipc_printf(buf, "CON:");
159 			break;
160 		case TIPC_MCAST_MSG:
161 			tipc_printf(buf, "MCST:");
162 			break;
163 		case TIPC_NAMED_MSG:
164 			tipc_printf(buf, "NAM:");
165 			break;
166 		case TIPC_DIRECT_MSG:
167 			tipc_printf(buf, "DIR:");
168 			break;
169 		default:
170 			tipc_printf(buf, "UNKNOWN TYPE %u", msg_type(msg));
171 		}
172 		if (msg_reroute_cnt(msg))
173 			tipc_printf(buf, "REROUTED(%u):",
174 				    msg_reroute_cnt(msg));
175 		break;
176 	case NAME_DISTRIBUTOR:
177 		tipc_printf(buf, "NMD::");
178 		switch (msg_type(msg)) {
179 		case PUBLICATION:
180 			tipc_printf(buf, "PUBL(%u):", (msg_size(msg) - msg_hdr_sz(msg)) / 20);	/* Items */
181 			break;
182 		case WITHDRAWAL:
183 			tipc_printf(buf, "WDRW:");
184 			break;
185 		default:
186 			tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
187 		}
188 		if (msg_reroute_cnt(msg))
189 			tipc_printf(buf, "REROUTED(%u):",
190 				    msg_reroute_cnt(msg));
191 		break;
192 	case CONN_MANAGER:
193 		tipc_printf(buf, "CONN_MNG:");
194 		switch (msg_type(msg)) {
195 		case CONN_PROBE:
196 			tipc_printf(buf, "PROBE:");
197 			break;
198 		case CONN_PROBE_REPLY:
199 			tipc_printf(buf, "PROBE_REPLY:");
200 			break;
201 		case CONN_ACK:
202 			tipc_printf(buf, "CONN_ACK:");
203 			tipc_printf(buf, "ACK(%u):", msg_msgcnt(msg));
204 			break;
205 		default:
206 			tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
207 		}
208 		if (msg_reroute_cnt(msg))
209 			tipc_printf(buf, "REROUTED(%u):", msg_reroute_cnt(msg));
210 		break;
211 	case LINK_PROTOCOL:
212 		switch (msg_type(msg)) {
213 		case STATE_MSG:
214 			tipc_printf(buf, "STATE:");
215 			tipc_printf(buf, "%s:", msg_probe(msg) ? "PRB" : "");
216 			tipc_printf(buf, "NXS(%u):", msg_next_sent(msg));
217 			tipc_printf(buf, "GAP(%u):", msg_seq_gap(msg));
218 			tipc_printf(buf, "LSTBC(%u):", msg_last_bcast(msg));
219 			break;
220 		case RESET_MSG:
221 			tipc_printf(buf, "RESET:");
222 			if (msg_size(msg) != msg_hdr_sz(msg))
223 				tipc_printf(buf, "BEAR:%s:", msg_data(msg));
224 			break;
225 		case ACTIVATE_MSG:
226 			tipc_printf(buf, "ACTIVATE:");
227 			break;
228 		default:
229 			tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
230 		}
231 		tipc_printf(buf, "PLANE(%c):", msg_net_plane(msg));
232 		tipc_printf(buf, "SESS(%u):", msg_session(msg));
233 		break;
234 	case CHANGEOVER_PROTOCOL:
235 		tipc_printf(buf, "TUNL:");
236 		switch (msg_type(msg)) {
237 		case DUPLICATE_MSG:
238 			tipc_printf(buf, "DUPL:");
239 			break;
240 		case ORIGINAL_MSG:
241 			tipc_printf(buf, "ORIG:");
242 			tipc_printf(buf, "EXP(%u)", msg_msgcnt(msg));
243 			break;
244 		default:
245 			tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
246 		}
247 		break;
248 	case LINK_CONFIG:
249 		tipc_printf(buf, "CFG:");
250 		switch (msg_type(msg)) {
251 		case DSC_REQ_MSG:
252 			tipc_printf(buf, "DSC_REQ:");
253 			break;
254 		case DSC_RESP_MSG:
255 			tipc_printf(buf, "DSC_RESP:");
256 			break;
257 		default:
258 			tipc_printf(buf, "UNKNOWN TYPE:%x:", msg_type(msg));
259 			break;
260 		}
261 		break;
262 	default:
263 		tipc_printf(buf, "UNKNOWN USER:");
264 	}
265 
266 	switch (usr) {
267 	case CONN_MANAGER:
268 	case TIPC_LOW_IMPORTANCE:
269 	case TIPC_MEDIUM_IMPORTANCE:
270 	case TIPC_HIGH_IMPORTANCE:
271 	case TIPC_CRITICAL_IMPORTANCE:
272 		switch (msg_errcode(msg)) {
273 		case TIPC_OK:
274 			break;
275 		case TIPC_ERR_NO_NAME:
276 			tipc_printf(buf, "NO_NAME:");
277 			break;
278 		case TIPC_ERR_NO_PORT:
279 			tipc_printf(buf, "NO_PORT:");
280 			break;
281 		case TIPC_ERR_NO_NODE:
282 			tipc_printf(buf, "NO_PROC:");
283 			break;
284 		case TIPC_ERR_OVERLOAD:
285 			tipc_printf(buf, "OVERLOAD:");
286 			break;
287 		case TIPC_CONN_SHUTDOWN:
288 			tipc_printf(buf, "SHUTDOWN:");
289 			break;
290 		default:
291 			tipc_printf(buf, "UNKNOWN ERROR(%x):",
292 				    msg_errcode(msg));
293 		}
294 	default:
295 		break;
296 	}
297 
298 	tipc_printf(buf, "HZ(%u):", msg_hdr_sz(msg));
299 	tipc_printf(buf, "SZ(%u):", msg_size(msg));
300 	tipc_printf(buf, "SQNO(%u):", msg_seqno(msg));
301 
302 	if (msg_non_seq(msg))
303 		tipc_printf(buf, "NOSEQ:");
304 	else
305 		tipc_printf(buf, "ACK(%u):", msg_ack(msg));
306 	tipc_printf(buf, "BACK(%u):", msg_bcast_ack(msg));
307 	tipc_printf(buf, "PRND(%x)", msg_prevnode(msg));
308 
309 	if (msg_isdata(msg)) {
310 		if (msg_named(msg)) {
311 			tipc_printf(buf, "NTYP(%u):", msg_nametype(msg));
312 			tipc_printf(buf, "NINST(%u)", msg_nameinst(msg));
313 		}
314 	}
315 
316 	if ((usr != LINK_PROTOCOL) && (usr != LINK_CONFIG) &&
317 	    (usr != MSG_BUNDLER)) {
318 		if (!msg_short(msg)) {
319 			tipc_printf(buf, ":ORIG(%x:%u):",
320 				    msg_orignode(msg), msg_origport(msg));
321 			tipc_printf(buf, ":DEST(%x:%u):",
322 				    msg_destnode(msg), msg_destport(msg));
323 		} else {
324 			tipc_printf(buf, ":OPRT(%u):", msg_origport(msg));
325 			tipc_printf(buf, ":DPRT(%u):", msg_destport(msg));
326 		}
327 	}
328 	if (msg_user(msg) == NAME_DISTRIBUTOR) {
329 		tipc_printf(buf, ":ONOD(%x):", msg_orignode(msg));
330 		tipc_printf(buf, ":DNOD(%x):", msg_destnode(msg));
331 	}
332 
333 	if (msg_user(msg) ==  LINK_CONFIG) {
334 		struct tipc_media_addr orig;
335 
336 		tipc_printf(buf, ":DDOM(%x):", msg_dest_domain(msg));
337 		tipc_printf(buf, ":NETID(%u):", msg_bc_netid(msg));
338 		memcpy(orig.value, msg_media_addr(msg), sizeof(orig.value));
339 		orig.media_id = 0;
340 		orig.broadcast = 0;
341 		tipc_media_addr_printf(buf, &orig);
342 	}
343 	if (msg_user(msg) == BCAST_PROTOCOL) {
344 		tipc_printf(buf, "BCNACK:AFTER(%u):", msg_bcgap_after(msg));
345 		tipc_printf(buf, "TO(%u):", msg_bcgap_to(msg));
346 	}
347 	tipc_printf(buf, "\n");
348 	if ((usr == CHANGEOVER_PROTOCOL) && (msg_msgcnt(msg)))
349 		tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
350 	if ((usr == MSG_FRAGMENTER) && (msg_type(msg) == FIRST_FRAGMENT))
351 		tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
352 }
353 #endif
354