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718e3744 | 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" | |
78104b9b | 28 | #include "vrf.h" |
718e3744 | 29 | |
30 | #include "zebra/rib.h" | |
6621ca86 | 31 | #include "zebra/zserv.h" |
718e3744 | 32 | |
33 | #include <sys/stream.h> | |
34 | #include <sys/tihdr.h> | |
35 | ||
36 | /* Solaris defines these in both <netinet/in.h> and <inet/in.h>, sigh */ | |
37 | #ifdef SUNOS_5 | |
38 | #include <sys/tiuser.h> | |
39 | #ifndef T_CURRENT | |
40 | #define T_CURRENT MI_T_CURRENT | |
41 | #endif /* T_CURRENT */ | |
42 | #ifndef IRE_CACHE | |
43 | #define IRE_CACHE 0x0020 /* Cached Route entry */ | |
44 | #endif /* IRE_CACHE */ | |
45 | #ifndef IRE_HOST_REDIRECT | |
46 | #define IRE_HOST_REDIRECT 0x0200 /* Host route entry from redirects */ | |
47 | #endif /* IRE_HOST_REDIRECT */ | |
48 | #ifndef IRE_CACHETABLE | |
49 | #define IRE_CACHETABLE (IRE_CACHE | IRE_BROADCAST | IRE_LOCAL | \ | |
50 | IRE_LOOPBACK) | |
51 | #endif /* IRE_CACHETABLE */ | |
52 | #undef IPOPT_EOL | |
53 | #undef IPOPT_NOP | |
54 | #undef IPOPT_LSRR | |
55 | #undef IPOPT_RR | |
56 | #undef IPOPT_SSRR | |
57 | #endif /* SUNOS_5 */ | |
58 | ||
59 | #include <inet/common.h> | |
60 | #include <inet/ip.h> | |
61 | #include <inet/mib2.h> | |
62 | ||
63 | /* device to read IP routing table from */ | |
64 | #ifndef _PATH_GETMSG_ROUTE | |
65 | #define _PATH_GETMSG_ROUTE "/dev/ip" | |
66 | #endif /* _PATH_GETMSG_ROUTE */ | |
67 | ||
68 | #define RT_BUFSIZ 8192 | |
69 | ||
6621ca86 | 70 | static void |
71 | handle_route_entry (mib2_ipRouteEntry_t *routeEntry) | |
718e3744 | 72 | { |
73 | struct prefix_ipv4 prefix; | |
74 | struct in_addr tmpaddr, gateway; | |
75 | u_char zebra_flags = 0; | |
76 | ||
77 | if (routeEntry->ipRouteInfo.re_ire_type & IRE_CACHETABLE) | |
78 | return; | |
79 | ||
80 | if (routeEntry->ipRouteInfo.re_ire_type & IRE_HOST_REDIRECT) | |
81 | zebra_flags |= ZEBRA_FLAG_SELFROUTE; | |
82 | ||
83 | prefix.family = AF_INET; | |
84 | ||
85 | tmpaddr.s_addr = routeEntry->ipRouteDest; | |
86 | prefix.prefix = tmpaddr; | |
87 | ||
88 | tmpaddr.s_addr = routeEntry->ipRouteMask; | |
89 | prefix.prefixlen = ip_masklen (tmpaddr); | |
90 | ||
91 | gateway.s_addr = routeEntry->ipRouteNextHop; | |
92 | ||
7c8ff89e | 93 | rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &prefix, |
78104b9b | 94 | &gateway, NULL, 0, VRF_DEFAULT, 0, 0, 0, SAFI_UNICAST); |
718e3744 | 95 | } |
96 | ||
6621ca86 | 97 | void |
12f6fb97 | 98 | route_read (struct zebra_ns *zns) |
718e3744 | 99 | { |
100 | char storage[RT_BUFSIZ]; | |
101 | ||
102 | struct T_optmgmt_req *TLIreq = (struct T_optmgmt_req *) storage; | |
103 | struct T_optmgmt_ack *TLIack = (struct T_optmgmt_ack *) storage; | |
104 | struct T_error_ack *TLIerr = (struct T_error_ack *) storage; | |
105 | ||
106 | struct opthdr *MIB2hdr; | |
107 | ||
108 | mib2_ipRouteEntry_t *routeEntry, *lastRouteEntry; | |
109 | ||
110 | struct strbuf msgdata; | |
111 | int flags, dev, retval, process; | |
112 | ||
113 | if ((dev = open (_PATH_GETMSG_ROUTE, O_RDWR)) == -1) { | |
114 | zlog_warn ("can't open %s: %s", _PATH_GETMSG_ROUTE, | |
6099b3b5 | 115 | safe_strerror (errno)); |
718e3744 | 116 | return; |
117 | } | |
118 | ||
119 | TLIreq->PRIM_type = T_OPTMGMT_REQ; | |
120 | TLIreq->OPT_offset = sizeof (struct T_optmgmt_req); | |
121 | TLIreq->OPT_length = sizeof (struct opthdr); | |
122 | TLIreq->MGMT_flags = T_CURRENT; | |
123 | ||
124 | MIB2hdr = (struct opthdr *) &TLIreq[1]; | |
125 | ||
126 | MIB2hdr->level = MIB2_IP; | |
127 | MIB2hdr->name = 0; | |
128 | MIB2hdr->len = 0; | |
129 | ||
130 | msgdata.buf = storage; | |
131 | msgdata.len = sizeof (struct T_optmgmt_req) + sizeof (struct opthdr); | |
132 | ||
133 | flags = 0; | |
134 | ||
135 | if (putmsg (dev, &msgdata, NULL, flags) == -1) { | |
6099b3b5 | 136 | zlog_warn ("putmsg failed: %s", safe_strerror (errno)); |
718e3744 | 137 | goto exit; |
138 | } | |
139 | ||
140 | MIB2hdr = (struct opthdr *) &TLIack[1]; | |
141 | msgdata.maxlen = sizeof (storage); | |
142 | ||
143 | while (1) { | |
144 | flags = 0; | |
145 | retval = getmsg (dev, &msgdata, NULL, &flags); | |
146 | ||
147 | if (retval == -1) { | |
6099b3b5 | 148 | zlog_warn ("getmsg(ctl) failed: %s", safe_strerror (errno)); |
718e3744 | 149 | goto exit; |
150 | } | |
151 | ||
152 | /* This is normal loop termination */ | |
153 | if (retval == 0 && | |
154 | msgdata.len >= sizeof (struct T_optmgmt_ack) && | |
155 | TLIack->PRIM_type == T_OPTMGMT_ACK && | |
156 | TLIack->MGMT_flags == T_SUCCESS && | |
157 | MIB2hdr->len == 0) | |
158 | break; | |
159 | ||
160 | if (msgdata.len >= sizeof (struct T_error_ack) && | |
161 | TLIerr->PRIM_type == T_ERROR_ACK) { | |
162 | zlog_warn ("getmsg(ctl) returned T_ERROR_ACK: %s", | |
6099b3b5 | 163 | safe_strerror ((TLIerr->TLI_error == TSYSERR) |
718e3744 | 164 | ? TLIerr->UNIX_error : EPROTO)); |
165 | break; | |
166 | } | |
167 | ||
168 | /* should dump more debugging info to the log statement, | |
169 | like what GateD does in this instance, but not | |
170 | critical yet. */ | |
171 | if (retval != MOREDATA || | |
172 | msgdata.len < sizeof (struct T_optmgmt_ack) || | |
173 | TLIack->PRIM_type != T_OPTMGMT_ACK || | |
174 | TLIack->MGMT_flags != T_SUCCESS) { | |
175 | errno = ENOMSG; | |
176 | zlog_warn ("getmsg(ctl) returned bizarreness"); | |
177 | break; | |
178 | } | |
179 | ||
180 | /* MIB2_IP_21 is the the pseudo-MIB2 ipRouteTable | |
181 | entry, see <inet/mib2.h>. "This isn't the MIB data | |
182 | you're looking for." */ | |
183 | process = (MIB2hdr->level == MIB2_IP && | |
184 | MIB2hdr->name == MIB2_IP_21) ? 1 : 0; | |
185 | ||
186 | /* getmsg writes the data buffer out completely, not | |
187 | to the closest smaller multiple. Unless reassembling | |
188 | data structures across buffer boundaries is your idea | |
189 | of a good time, set maxlen to the closest smaller | |
190 | multiple of the size of the datastructure you're | |
191 | retrieving. */ | |
192 | msgdata.maxlen = sizeof (storage) - (sizeof (storage) | |
193 | % sizeof (mib2_ipRouteEntry_t)); | |
194 | ||
195 | msgdata.len = 0; | |
196 | flags = 0; | |
197 | ||
198 | do { | |
199 | retval = getmsg (dev, NULL, &msgdata, &flags); | |
200 | ||
201 | if (retval == -1) { | |
202 | zlog_warn ("getmsg(data) failed: %s", | |
6099b3b5 | 203 | safe_strerror (errno)); |
718e3744 | 204 | goto exit; |
205 | } | |
206 | ||
207 | if (!(retval == 0 || retval == MOREDATA)) { | |
208 | zlog_warn ("getmsg(data) returned %d", retval); | |
209 | goto exit; | |
210 | } | |
211 | ||
212 | if (process) { | |
213 | if (msgdata.len % | |
214 | sizeof (mib2_ipRouteEntry_t) != 0) { | |
215 | zlog_warn ("getmsg(data) returned " | |
216 | "msgdata.len = %d (%% sizeof (mib2_ipRouteEntry_t) != 0)", msgdata.len); | |
217 | goto exit; | |
218 | } | |
219 | ||
220 | routeEntry = (mib2_ipRouteEntry_t *) | |
221 | msgdata.buf; | |
222 | lastRouteEntry = (mib2_ipRouteEntry_t *) | |
223 | (msgdata.buf + msgdata.len); | |
224 | do { | |
225 | handle_route_entry (routeEntry); | |
226 | } while (++routeEntry < lastRouteEntry); | |
227 | } | |
228 | } while (retval == MOREDATA); | |
229 | } | |
230 | ||
231 | exit: | |
232 | close (dev); | |
233 | } |