1: /*
2: * Kernel routing table readup by getmsg(2)
3: * Copyright (C) 1999 Michael Handler
4: *
5: * This file is part of GNU Zebra.
6: *
7: * GNU Zebra is free software; you can redistribute it and/or modify it
8: * under the terms of the GNU General Public License as published by the
9: * Free Software Foundation; either version 2, or (at your option) any
10: * later version.
11: *
12: * GNU Zebra is distributed in the hope that it will be useful, but
13: * WITHOUT ANY WARRANTY; without even the implied warranty of
14: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15: * General Public License for more details.
16: *
17: * You should have received a copy of the GNU General Public License
18: * along with GNU Zebra; see the file COPYING. If not, write to the Free
19: * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20: * 02111-1307, USA.
21: */
22:
23: #include <zebra.h>
24:
25: #include "prefix.h"
26: #include "log.h"
27: #include "if.h"
28:
29: #include "zebra/rib.h"
30: #include "zebra/zserv.h"
31:
32: #include <sys/stream.h>
33: #include <sys/tihdr.h>
34:
35: /* Solaris defines these in both <netinet/in.h> and <inet/in.h>, sigh */
36: #ifdef SUNOS_5
37: #include <sys/tiuser.h>
38: #ifndef T_CURRENT
39: #define T_CURRENT MI_T_CURRENT
40: #endif /* T_CURRENT */
41: #ifndef IRE_CACHE
42: #define IRE_CACHE 0x0020 /* Cached Route entry */
43: #endif /* IRE_CACHE */
44: #ifndef IRE_HOST_REDIRECT
45: #define IRE_HOST_REDIRECT 0x0200 /* Host route entry from redirects */
46: #endif /* IRE_HOST_REDIRECT */
47: #ifndef IRE_CACHETABLE
48: #define IRE_CACHETABLE (IRE_CACHE | IRE_BROADCAST | IRE_LOCAL | \
49: IRE_LOOPBACK)
50: #endif /* IRE_CACHETABLE */
51: #undef IPOPT_EOL
52: #undef IPOPT_NOP
53: #undef IPOPT_LSRR
54: #undef IPOPT_RR
55: #undef IPOPT_SSRR
56: #endif /* SUNOS_5 */
57:
58: #include <inet/common.h>
59: #include <inet/ip.h>
60: #include <inet/mib2.h>
61:
62: /* device to read IP routing table from */
63: #ifndef _PATH_GETMSG_ROUTE
64: #define _PATH_GETMSG_ROUTE "/dev/ip"
65: #endif /* _PATH_GETMSG_ROUTE */
66:
67: #define RT_BUFSIZ 8192
68:
69: static void
70: handle_route_entry (mib2_ipRouteEntry_t *routeEntry)
71: {
72: struct prefix_ipv4 prefix;
73: struct in_addr tmpaddr, gateway;
74: u_char zebra_flags = 0;
75:
76: if (routeEntry->ipRouteInfo.re_ire_type & IRE_CACHETABLE)
77: return;
78:
79: if (routeEntry->ipRouteInfo.re_ire_type & IRE_HOST_REDIRECT)
80: zebra_flags |= ZEBRA_FLAG_SELFROUTE;
81:
82: prefix.family = AF_INET;
83:
84: tmpaddr.s_addr = routeEntry->ipRouteDest;
85: prefix.prefix = tmpaddr;
86:
87: tmpaddr.s_addr = routeEntry->ipRouteMask;
88: prefix.prefixlen = ip_masklen (tmpaddr);
89:
90: gateway.s_addr = routeEntry->ipRouteNextHop;
91:
92: rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, zebra_flags, &prefix,
93: &gateway, NULL, 0, 0, 0, 0, SAFI_UNICAST);
94: }
95:
96: void
97: route_read (void)
98: {
99: char storage[RT_BUFSIZ];
100:
101: struct T_optmgmt_req *TLIreq = (struct T_optmgmt_req *) storage;
102: struct T_optmgmt_ack *TLIack = (struct T_optmgmt_ack *) storage;
103: struct T_error_ack *TLIerr = (struct T_error_ack *) storage;
104:
105: struct opthdr *MIB2hdr;
106:
107: mib2_ipRouteEntry_t *routeEntry, *lastRouteEntry;
108:
109: struct strbuf msgdata;
110: int flags, dev, retval, process;
111:
112: if ((dev = open (_PATH_GETMSG_ROUTE, O_RDWR)) == -1) {
113: zlog_warn ("can't open %s: %s", _PATH_GETMSG_ROUTE,
114: safe_strerror (errno));
115: return;
116: }
117:
118: TLIreq->PRIM_type = T_OPTMGMT_REQ;
119: TLIreq->OPT_offset = sizeof (struct T_optmgmt_req);
120: TLIreq->OPT_length = sizeof (struct opthdr);
121: TLIreq->MGMT_flags = T_CURRENT;
122:
123: MIB2hdr = (struct opthdr *) &TLIreq[1];
124:
125: MIB2hdr->level = MIB2_IP;
126: MIB2hdr->name = 0;
127: MIB2hdr->len = 0;
128:
129: msgdata.buf = storage;
130: msgdata.len = sizeof (struct T_optmgmt_req) + sizeof (struct opthdr);
131:
132: flags = 0;
133:
134: if (putmsg (dev, &msgdata, NULL, flags) == -1) {
135: zlog_warn ("putmsg failed: %s", safe_strerror (errno));
136: goto exit;
137: }
138:
139: MIB2hdr = (struct opthdr *) &TLIack[1];
140: msgdata.maxlen = sizeof (storage);
141:
142: while (1) {
143: flags = 0;
144: retval = getmsg (dev, &msgdata, NULL, &flags);
145:
146: if (retval == -1) {
147: zlog_warn ("getmsg(ctl) failed: %s", safe_strerror (errno));
148: goto exit;
149: }
150:
151: /* This is normal loop termination */
152: if (retval == 0 &&
153: msgdata.len >= sizeof (struct T_optmgmt_ack) &&
154: TLIack->PRIM_type == T_OPTMGMT_ACK &&
155: TLIack->MGMT_flags == T_SUCCESS &&
156: MIB2hdr->len == 0)
157: break;
158:
159: if (msgdata.len >= sizeof (struct T_error_ack) &&
160: TLIerr->PRIM_type == T_ERROR_ACK) {
161: zlog_warn ("getmsg(ctl) returned T_ERROR_ACK: %s",
162: safe_strerror ((TLIerr->TLI_error == TSYSERR)
163: ? TLIerr->UNIX_error : EPROTO));
164: break;
165: }
166:
167: /* should dump more debugging info to the log statement,
168: like what GateD does in this instance, but not
169: critical yet. */
170: if (retval != MOREDATA ||
171: msgdata.len < sizeof (struct T_optmgmt_ack) ||
172: TLIack->PRIM_type != T_OPTMGMT_ACK ||
173: TLIack->MGMT_flags != T_SUCCESS) {
174: errno = ENOMSG;
175: zlog_warn ("getmsg(ctl) returned bizarreness");
176: break;
177: }
178:
179: /* MIB2_IP_21 is the the pseudo-MIB2 ipRouteTable
180: entry, see <inet/mib2.h>. "This isn't the MIB data
181: you're looking for." */
182: process = (MIB2hdr->level == MIB2_IP &&
183: MIB2hdr->name == MIB2_IP_21) ? 1 : 0;
184:
185: /* getmsg writes the data buffer out completely, not
186: to the closest smaller multiple. Unless reassembling
187: data structures across buffer boundaries is your idea
188: of a good time, set maxlen to the closest smaller
189: multiple of the size of the datastructure you're
190: retrieving. */
191: msgdata.maxlen = sizeof (storage) - (sizeof (storage)
192: % sizeof (mib2_ipRouteEntry_t));
193:
194: msgdata.len = 0;
195: flags = 0;
196:
197: do {
198: retval = getmsg (dev, NULL, &msgdata, &flags);
199:
200: if (retval == -1) {
201: zlog_warn ("getmsg(data) failed: %s",
202: safe_strerror (errno));
203: goto exit;
204: }
205:
206: if (!(retval == 0 || retval == MOREDATA)) {
207: zlog_warn ("getmsg(data) returned %d", retval);
208: goto exit;
209: }
210:
211: if (process) {
212: if (msgdata.len %
213: sizeof (mib2_ipRouteEntry_t) != 0) {
214: zlog_warn ("getmsg(data) returned "
215: "msgdata.len = %d (%% sizeof (mib2_ipRouteEntry_t) != 0)", msgdata.len);
216: goto exit;
217: }
218:
219: routeEntry = (mib2_ipRouteEntry_t *)
220: msgdata.buf;
221: lastRouteEntry = (mib2_ipRouteEntry_t *)
222: (msgdata.buf + msgdata.len);
223: do {
224: handle_route_entry (routeEntry);
225: } while (++routeEntry < lastRouteEntry);
226: }
227: } while (retval == MOREDATA);
228: }
229:
230: exit:
231: close (dev);
232: }
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