ipv4: flush route cache after change accept_local
[linux-2.6.git] / net / tipc / msg.c
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
76 int tipc_msg_build(struct tipc_msg *hdr, struct iovec const *msg_sect,
77                    u32 num_sect, unsigned int total_len,
78                             int max_size, int usrmem, struct sk_buff **buf)
79 {
80         int dsz, sz, hsz, pos, res, cnt;
81
82         dsz = total_len;
83         pos = hsz = msg_hdr_sz(hdr);
84         sz = hsz + dsz;
85         msg_set_size(hdr, sz);
86         if (unlikely(sz > max_size)) {
87                 *buf = NULL;
88                 return dsz;
89         }
90
91         *buf = tipc_buf_acquire(sz);
92         if (!(*buf))
93                 return -ENOMEM;
94         skb_copy_to_linear_data(*buf, hdr, hsz);
95         for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
96                 if (likely(usrmem))
97                         res = !copy_from_user((*buf)->data + pos,
98                                               msg_sect[cnt].iov_base,
99                                               msg_sect[cnt].iov_len);
100                 else
101                         skb_copy_to_linear_data_offset(*buf, pos,
102                                                        msg_sect[cnt].iov_base,
103                                                        msg_sect[cnt].iov_len);
104                 pos += msg_sect[cnt].iov_len;
105         }
106         if (likely(res))
107                 return dsz;
108
109         buf_discard(*buf);
110         *buf = NULL;
111         return -EFAULT;
112 }
113
114 #ifdef CONFIG_TIPC_DEBUG
115
116 void tipc_msg_dbg(struct print_buf *buf, struct tipc_msg *msg, const char *str)
117 {
118         u32 usr = msg_user(msg);
119         tipc_printf(buf, KERN_DEBUG);
120         tipc_printf(buf, str);
121
122         switch (usr) {
123         case MSG_BUNDLER:
124                 tipc_printf(buf, "BNDL::");
125                 tipc_printf(buf, "MSGS(%u):", msg_msgcnt(msg));
126                 break;
127         case BCAST_PROTOCOL:
128                 tipc_printf(buf, "BCASTP::");
129                 break;
130         case MSG_FRAGMENTER:
131                 tipc_printf(buf, "FRAGM::");
132                 switch (msg_type(msg)) {
133                 case FIRST_FRAGMENT:
134                         tipc_printf(buf, "FIRST:");
135                         break;
136                 case FRAGMENT:
137                         tipc_printf(buf, "BODY:");
138                         break;
139                 case LAST_FRAGMENT:
140                         tipc_printf(buf, "LAST:");
141                         break;
142                 default:
143                         tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
144
145                 }
146                 tipc_printf(buf, "NO(%u/%u):", msg_long_msgno(msg),
147                             msg_fragm_no(msg));
148                 break;
149         case TIPC_LOW_IMPORTANCE:
150         case TIPC_MEDIUM_IMPORTANCE:
151         case TIPC_HIGH_IMPORTANCE:
152         case TIPC_CRITICAL_IMPORTANCE:
153                 tipc_printf(buf, "DAT%u:", msg_user(msg));
154                 if (msg_short(msg)) {
155                         tipc_printf(buf, "CON:");
156                         break;
157                 }
158                 switch (msg_type(msg)) {
159                 case TIPC_CONN_MSG:
160                         tipc_printf(buf, "CON:");
161                         break;
162                 case TIPC_MCAST_MSG:
163                         tipc_printf(buf, "MCST:");
164                         break;
165                 case TIPC_NAMED_MSG:
166                         tipc_printf(buf, "NAM:");
167                         break;
168                 case TIPC_DIRECT_MSG:
169                         tipc_printf(buf, "DIR:");
170                         break;
171                 default:
172                         tipc_printf(buf, "UNKNOWN TYPE %u", msg_type(msg));
173                 }
174                 if (msg_reroute_cnt(msg))
175                         tipc_printf(buf, "REROUTED(%u):",
176                                     msg_reroute_cnt(msg));
177                 break;
178         case NAME_DISTRIBUTOR:
179                 tipc_printf(buf, "NMD::");
180                 switch (msg_type(msg)) {
181                 case PUBLICATION:
182                         tipc_printf(buf, "PUBL(%u):", (msg_size(msg) - msg_hdr_sz(msg)) / 20);  /* Items */
183                         break;
184                 case WITHDRAWAL:
185                         tipc_printf(buf, "WDRW:");
186                         break;
187                 default:
188                         tipc_printf(buf, "UNKNOWN:%x", msg_type(msg));
189                 }
190                 if (msg_reroute_cnt(msg))
191                         tipc_printf(buf, "REROUTED(%u):",
192                                     msg_reroute_cnt(msg));
193                 break;
194         case CONN_MANAGER:
195                 tipc_printf(buf, "CONN_MNG:");
196                 switch (msg_type(msg)) {
197                 case CONN_PROBE:
198                         tipc_printf(buf, "PROBE:");
199                         break;
200                 case CONN_PROBE_REPLY:
201                         tipc_printf(buf, "PROBE_REPLY:");
202                         break;
203                 case CONN_ACK:
204                         tipc_printf(buf, "CONN_ACK:");
205                         tipc_printf(buf, "ACK(%u):", msg_msgcnt(msg));
206                         break;
207                 default:
208                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
209                 }
210                 if (msg_reroute_cnt(msg))
211                         tipc_printf(buf, "REROUTED(%u):", msg_reroute_cnt(msg));
212                 break;
213         case LINK_PROTOCOL:
214                 switch (msg_type(msg)) {
215                 case STATE_MSG:
216                         tipc_printf(buf, "STATE:");
217                         tipc_printf(buf, "%s:", msg_probe(msg) ? "PRB" : "");
218                         tipc_printf(buf, "NXS(%u):", msg_next_sent(msg));
219                         tipc_printf(buf, "GAP(%u):", msg_seq_gap(msg));
220                         tipc_printf(buf, "LSTBC(%u):", msg_last_bcast(msg));
221                         break;
222                 case RESET_MSG:
223                         tipc_printf(buf, "RESET:");
224                         if (msg_size(msg) != msg_hdr_sz(msg))
225                                 tipc_printf(buf, "BEAR:%s:", msg_data(msg));
226                         break;
227                 case ACTIVATE_MSG:
228                         tipc_printf(buf, "ACTIVATE:");
229                         break;
230                 default:
231                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
232                 }
233                 tipc_printf(buf, "PLANE(%c):", msg_net_plane(msg));
234                 tipc_printf(buf, "SESS(%u):", msg_session(msg));
235                 break;
236         case CHANGEOVER_PROTOCOL:
237                 tipc_printf(buf, "TUNL:");
238                 switch (msg_type(msg)) {
239                 case DUPLICATE_MSG:
240                         tipc_printf(buf, "DUPL:");
241                         break;
242                 case ORIGINAL_MSG:
243                         tipc_printf(buf, "ORIG:");
244                         tipc_printf(buf, "EXP(%u)", msg_msgcnt(msg));
245                         break;
246                 default:
247                         tipc_printf(buf, "UNKNOWN TYPE:%x", msg_type(msg));
248                 }
249                 break;
250         case LINK_CONFIG:
251                 tipc_printf(buf, "CFG:");
252                 switch (msg_type(msg)) {
253                 case DSC_REQ_MSG:
254                         tipc_printf(buf, "DSC_REQ:");
255                         break;
256                 case DSC_RESP_MSG:
257                         tipc_printf(buf, "DSC_RESP:");
258                         break;
259                 default:
260                         tipc_printf(buf, "UNKNOWN TYPE:%x:", msg_type(msg));
261                         break;
262                 }
263                 break;
264         default:
265                 tipc_printf(buf, "UNKNOWN USER:");
266         }
267
268         switch (usr) {
269         case CONN_MANAGER:
270         case TIPC_LOW_IMPORTANCE:
271         case TIPC_MEDIUM_IMPORTANCE:
272         case TIPC_HIGH_IMPORTANCE:
273         case TIPC_CRITICAL_IMPORTANCE:
274                 switch (msg_errcode(msg)) {
275                 case TIPC_OK:
276                         break;
277                 case TIPC_ERR_NO_NAME:
278                         tipc_printf(buf, "NO_NAME:");
279                         break;
280                 case TIPC_ERR_NO_PORT:
281                         tipc_printf(buf, "NO_PORT:");
282                         break;
283                 case TIPC_ERR_NO_NODE:
284                         tipc_printf(buf, "NO_PROC:");
285                         break;
286                 case TIPC_ERR_OVERLOAD:
287                         tipc_printf(buf, "OVERLOAD:");
288                         break;
289                 case TIPC_CONN_SHUTDOWN:
290                         tipc_printf(buf, "SHUTDOWN:");
291                         break;
292                 default:
293                         tipc_printf(buf, "UNKNOWN ERROR(%x):",
294                                     msg_errcode(msg));
295                 }
296         default:
297                 break;
298         }
299
300         tipc_printf(buf, "HZ(%u):", msg_hdr_sz(msg));
301         tipc_printf(buf, "SZ(%u):", msg_size(msg));
302         tipc_printf(buf, "SQNO(%u):", msg_seqno(msg));
303
304         if (msg_non_seq(msg))
305                 tipc_printf(buf, "NOSEQ:");
306         else
307                 tipc_printf(buf, "ACK(%u):", msg_ack(msg));
308         tipc_printf(buf, "BACK(%u):", msg_bcast_ack(msg));
309         tipc_printf(buf, "PRND(%x)", msg_prevnode(msg));
310
311         if (msg_isdata(msg)) {
312                 if (msg_named(msg)) {
313                         tipc_printf(buf, "NTYP(%u):", msg_nametype(msg));
314                         tipc_printf(buf, "NINST(%u)", msg_nameinst(msg));
315                 }
316         }
317
318         if ((usr != LINK_PROTOCOL) && (usr != LINK_CONFIG) &&
319             (usr != MSG_BUNDLER)) {
320                 if (!msg_short(msg)) {
321                         tipc_printf(buf, ":ORIG(%x:%u):",
322                                     msg_orignode(msg), msg_origport(msg));
323                         tipc_printf(buf, ":DEST(%x:%u):",
324                                     msg_destnode(msg), msg_destport(msg));
325                 } else {
326                         tipc_printf(buf, ":OPRT(%u):", msg_origport(msg));
327                         tipc_printf(buf, ":DPRT(%u):", msg_destport(msg));
328                 }
329         }
330         if (msg_user(msg) == NAME_DISTRIBUTOR) {
331                 tipc_printf(buf, ":ONOD(%x):", msg_orignode(msg));
332                 tipc_printf(buf, ":DNOD(%x):", msg_destnode(msg));
333         }
334
335         if (msg_user(msg) ==  LINK_CONFIG) {
336                 u32 *raw = (u32 *)msg;
337                 struct tipc_media_addr *orig = (struct tipc_media_addr *)&raw[5];
338                 tipc_printf(buf, ":DDOM(%x):", msg_dest_domain(msg));
339                 tipc_printf(buf, ":NETID(%u):", msg_bc_netid(msg));
340                 tipc_media_addr_printf(buf, orig);
341         }
342         if (msg_user(msg) == BCAST_PROTOCOL) {
343                 tipc_printf(buf, "BCNACK:AFTER(%u):", msg_bcgap_after(msg));
344                 tipc_printf(buf, "TO(%u):", msg_bcgap_to(msg));
345         }
346         tipc_printf(buf, "\n");
347         if ((usr == CHANGEOVER_PROTOCOL) && (msg_msgcnt(msg)))
348                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
349         if ((usr == MSG_FRAGMENTER) && (msg_type(msg) == FIRST_FRAGMENT))
350                 tipc_msg_dbg(buf, msg_get_wrapped(msg), "      /");
351 }
352
353 #endif