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1 | /* | |
2 | PIM for Quagga: add the ability to configure multicast static routes | |
3 | Copyright (C) 2014 Nathan Bahr, ATCorp | |
4 | ||
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, but | |
11 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; see the file COPYING; if not, write to the | |
17 | Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
18 | MA 02110-1301 USA | |
19 | */ | |
20 | ||
21 | #include <zebra.h> | |
22 | ||
23 | #include "vty.h" | |
24 | #include "if.h" | |
25 | #include "log.h" | |
26 | #include "memory.h" | |
27 | #include "linklist.h" | |
28 | ||
29 | #include "pimd.h" | |
30 | #include "pim_oil.h" | |
31 | #include "pim_static.h" | |
32 | #include "pim_time.h" | |
33 | #include "pim_str.h" | |
34 | #include "pim_iface.h" | |
35 | ||
36 | void pim_static_route_free(struct static_route *s_route) | |
37 | { | |
38 | XFREE(MTYPE_PIM_STATIC_ROUTE, s_route); | |
39 | } | |
40 | ||
41 | static struct static_route * static_route_alloc() | |
42 | { | |
43 | struct static_route *s_route; | |
44 | ||
45 | s_route = XCALLOC(MTYPE_PIM_STATIC_ROUTE, sizeof(*s_route)); | |
46 | if (!s_route) { | |
47 | zlog_err("PIM XCALLOC(%zu) failure", sizeof(*s_route)); | |
48 | return 0; | |
49 | } | |
50 | return s_route; | |
51 | } | |
52 | ||
53 | static struct static_route *static_route_new(unsigned int iif, | |
54 | unsigned int oif, | |
55 | struct in_addr group, | |
56 | struct in_addr source) | |
57 | { | |
58 | struct static_route * s_route; | |
59 | s_route = static_route_alloc(); | |
60 | if (!s_route) { | |
61 | return 0; | |
62 | } | |
63 | ||
64 | s_route->group = group; | |
65 | s_route->source = source; | |
66 | s_route->iif = iif; | |
67 | s_route->oif_ttls[oif] = 1; | |
68 | s_route->c_oil.oil_ref_count = 1; | |
69 | s_route->c_oil.oil.mfcc_origin = source; | |
70 | s_route->c_oil.oil.mfcc_mcastgrp = group; | |
71 | s_route->c_oil.oil.mfcc_parent = iif; | |
72 | s_route->c_oil.oil.mfcc_ttls[oif] = 1; | |
73 | s_route->c_oil.oif_creation[oif] = pim_time_monotonic_sec(); | |
74 | ||
75 | return s_route; | |
76 | } | |
77 | ||
78 | ||
79 | int pim_static_add(struct interface *iif, struct interface *oif, struct in_addr group, struct in_addr source) | |
80 | { | |
81 | struct listnode *node = 0; | |
82 | struct static_route *s_route = 0; | |
83 | struct static_route *original_s_route = 0; | |
84 | struct pim_interface *pim_iif = iif ? iif->info : 0; | |
85 | struct pim_interface *pim_oif = oif ? oif->info : 0; | |
86 | ifindex_t iif_index = pim_iif ? pim_iif->mroute_vif_index : 0; | |
87 | ifindex_t oif_index = pim_oif ? pim_oif->mroute_vif_index : 0; | |
88 | ||
89 | if (!iif_index || !oif_index) { | |
90 | zlog_warn("%s %s: Unable to add static route: Invalid interface index(iif=%d,oif=%d)", | |
91 | __FILE__, __PRETTY_FUNCTION__, | |
92 | iif_index, | |
93 | oif_index); | |
94 | return -2; | |
95 | } | |
96 | ||
97 | #ifdef PIM_ENFORCE_LOOPFREE_MFC | |
98 | if (iif_index == oif_index) { | |
99 | /* looped MFC entry */ | |
100 | zlog_warn("%s %s: Unable to add static route: Looped MFC entry(iif=%d,oif=%d)", | |
101 | __FILE__, __PRETTY_FUNCTION__, | |
102 | iif_index, | |
103 | oif_index); | |
104 | return -4; | |
105 | } | |
106 | #endif | |
107 | ||
108 | for (ALL_LIST_ELEMENTS_RO(qpim_static_route_list, node, s_route)) { | |
109 | if (s_route->group.s_addr == group.s_addr && | |
110 | s_route->source.s_addr == source.s_addr) { | |
111 | if (s_route->iif == iif_index && | |
112 | s_route->oif_ttls[oif_index]) { | |
113 | char gifaddr_str[100]; | |
114 | char sifaddr_str[100]; | |
115 | pim_inet4_dump("<ifaddr?>", group, gifaddr_str, sizeof(gifaddr_str)); | |
116 | pim_inet4_dump("<ifaddr?>", source, sifaddr_str, sizeof(sifaddr_str)); | |
117 | zlog_warn("%s %s: Unable to add static route: Route already exists (iif=%d,oif=%d,group=%s,source=%s)", | |
118 | __FILE__, __PRETTY_FUNCTION__, | |
119 | iif_index, | |
120 | oif_index, | |
121 | gifaddr_str, | |
122 | sifaddr_str); | |
123 | return -3; | |
124 | } | |
125 | ||
126 | /* Ok, from here on out we will be making changes to the s_route structure, but if | |
127 | * for some reason we fail to commit these changes to the kernel, we want to be able | |
128 | * restore the state of the list. So copy the node data and if need be, we can copy | |
129 | * back if it fails. | |
130 | */ | |
131 | original_s_route = static_route_alloc(); | |
132 | if (!original_s_route) { | |
133 | return -5; | |
134 | } | |
135 | memcpy(original_s_route, s_route, sizeof(struct static_route)); | |
136 | ||
137 | /* Route exists and has the same input interface, but adding a new output interface */ | |
138 | if (s_route->iif == iif_index) { | |
139 | s_route->oif_ttls[oif_index] = 1; | |
140 | s_route->c_oil.oil.mfcc_ttls[oif_index] = 1; | |
141 | s_route->c_oil.oif_creation[oif_index] = pim_time_monotonic_sec(); | |
142 | ++s_route->c_oil.oil_ref_count; | |
143 | } else { | |
144 | /* input interface changed */ | |
145 | s_route->iif = iif_index; | |
146 | s_route->c_oil.oil.mfcc_parent = iif_index; | |
147 | ||
148 | #ifdef PIM_ENFORCE_LOOPFREE_MFC | |
149 | /* check to make sure the new input was not an old output */ | |
150 | if (s_route->oif_ttls[iif_index]) { | |
151 | s_route->oif_ttls[iif_index] = 0; | |
152 | s_route->c_oil.oif_creation[iif_index] = 0; | |
153 | s_route->c_oil.oil.mfcc_ttls[iif_index] = 0; | |
154 | --s_route->c_oil.oil_ref_count; | |
155 | } | |
156 | #endif | |
157 | ||
158 | /* now add the new output, if it is new */ | |
159 | if (!s_route->oif_ttls[oif_index]) { | |
160 | s_route->oif_ttls[oif_index] = 1; | |
161 | s_route->c_oil.oif_creation[oif_index] = pim_time_monotonic_sec(); | |
162 | s_route->c_oil.oil.mfcc_ttls[oif_index] = 1; | |
163 | ++s_route->c_oil.oil_ref_count; | |
164 | } | |
165 | } | |
166 | ||
167 | break; | |
168 | } | |
169 | } | |
170 | ||
171 | /* If node is null then we reached the end of the list without finding a match */ | |
172 | if (!node) { | |
173 | s_route = static_route_new(iif_index, oif_index, group, source); | |
174 | listnode_add(qpim_static_route_list, s_route); | |
175 | } | |
176 | ||
177 | if (pim_mroute_add(&s_route->c_oil)) | |
178 | { | |
179 | char gifaddr_str[100]; | |
180 | char sifaddr_str[100]; | |
181 | pim_inet4_dump("<ifaddr?>", group, gifaddr_str, sizeof(gifaddr_str)); | |
182 | pim_inet4_dump("<ifaddr?>", source, sifaddr_str, sizeof(sifaddr_str)); | |
183 | zlog_warn("%s %s: Unable to add static route(iif=%d,oif=%d,group=%s,source=%s)", | |
184 | __FILE__, __PRETTY_FUNCTION__, | |
185 | iif_index, | |
186 | oif_index, | |
187 | gifaddr_str, | |
188 | sifaddr_str); | |
189 | ||
190 | /* Need to put s_route back to the way it was */ | |
191 | if (original_s_route) { | |
192 | memcpy(s_route, original_s_route, sizeof(struct static_route)); | |
193 | } else { | |
194 | /* we never stored off a copy, so it must have been a fresh new route */ | |
195 | listnode_delete(qpim_static_route_list, s_route); | |
196 | pim_static_route_free(s_route); | |
197 | } | |
198 | ||
199 | if (original_s_route) { | |
200 | pim_static_route_free(original_s_route); | |
201 | } | |
202 | ||
203 | return -1; | |
204 | } | |
205 | ||
206 | /* Make sure we free the memory for the route copy if used */ | |
207 | if (original_s_route) { | |
208 | pim_static_route_free(original_s_route); | |
209 | } | |
210 | ||
211 | if (PIM_DEBUG_STATIC) { | |
212 | char gifaddr_str[100]; | |
213 | char sifaddr_str[100]; | |
214 | pim_inet4_dump("<ifaddr?>", group, gifaddr_str, sizeof(gifaddr_str)); | |
215 | pim_inet4_dump("<ifaddr?>", source, sifaddr_str, sizeof(sifaddr_str)); | |
216 | zlog_debug("%s: Static route added(iif=%d,oif=%d,group=%s,source=%s)", | |
217 | __PRETTY_FUNCTION__, | |
218 | iif_index, | |
219 | oif_index, | |
220 | gifaddr_str, | |
221 | sifaddr_str); | |
222 | } | |
223 | ||
224 | return 0; | |
225 | } | |
226 | ||
227 | int pim_static_del(struct interface *iif, struct interface *oif, struct in_addr group, struct in_addr source) | |
228 | { | |
229 | struct listnode *node = 0; | |
230 | struct listnode *nextnode = 0; | |
231 | struct static_route *s_route = 0; | |
232 | struct pim_interface *pim_iif = iif ? iif->info : 0; | |
233 | struct pim_interface *pim_oif = oif ? oif->info : 0; | |
234 | ifindex_t iif_index = pim_iif ? pim_iif->mroute_vif_index : 0; | |
235 | ifindex_t oif_index = pim_oif ? pim_oif->mroute_vif_index : 0; | |
236 | ||
237 | if (!iif_index || !oif_index) { | |
238 | zlog_warn("%s %s: Unable to remove static route: Invalid interface index(iif=%d,oif=%d)", | |
239 | __FILE__, __PRETTY_FUNCTION__, | |
240 | iif_index, | |
241 | oif_index); | |
242 | return -2; | |
243 | } | |
244 | ||
245 | for (ALL_LIST_ELEMENTS(qpim_static_route_list, node, nextnode, s_route)) { | |
246 | if (s_route->iif == iif_index && | |
247 | s_route->group.s_addr == group.s_addr && | |
248 | s_route->source.s_addr == source.s_addr && | |
249 | s_route->oif_ttls[oif_index]) { | |
250 | s_route->oif_ttls[oif_index] = 0; | |
251 | s_route->c_oil.oil.mfcc_ttls[oif_index] = 0; | |
252 | --s_route->c_oil.oil_ref_count; | |
253 | ||
254 | /* If there are no more outputs then delete the whole route, otherwise set the route with the new outputs */ | |
255 | if (s_route->c_oil.oil_ref_count <= 0 ? | |
256 | pim_mroute_del(&s_route->c_oil) : pim_mroute_add(&s_route->c_oil)) { | |
257 | char gifaddr_str[100]; | |
258 | char sifaddr_str[100]; | |
259 | pim_inet4_dump("<ifaddr?>", group, gifaddr_str, sizeof(gifaddr_str)); | |
260 | pim_inet4_dump("<ifaddr?>", source, sifaddr_str, sizeof(sifaddr_str)); | |
261 | zlog_warn("%s %s: Unable to remove static route(iif=%d,oif=%d,group=%s,source=%s)", | |
262 | __FILE__, __PRETTY_FUNCTION__, | |
263 | iif_index, | |
264 | oif_index, | |
265 | gifaddr_str, | |
266 | sifaddr_str); | |
267 | ||
268 | s_route->oif_ttls[oif_index] = 1; | |
269 | s_route->c_oil.oil.mfcc_ttls[oif_index] = 1; | |
270 | ++s_route->c_oil.oil_ref_count; | |
271 | ||
272 | return -1; | |
273 | } | |
274 | ||
275 | s_route->c_oil.oif_creation[oif_index] = 0; | |
276 | ||
277 | if (s_route->c_oil.oil_ref_count <= 0) { | |
278 | listnode_delete(qpim_static_route_list, s_route); | |
279 | pim_static_route_free(s_route); | |
280 | } | |
281 | ||
282 | if (PIM_DEBUG_STATIC) { | |
283 | char gifaddr_str[100]; | |
284 | char sifaddr_str[100]; | |
285 | pim_inet4_dump("<ifaddr?>", group, gifaddr_str, sizeof(gifaddr_str)); | |
286 | pim_inet4_dump("<ifaddr?>", source, sifaddr_str, sizeof(sifaddr_str)); | |
287 | zlog_debug("%s: Static route removed(iif=%d,oif=%d,group=%s,source=%s)", | |
288 | __PRETTY_FUNCTION__, | |
289 | iif_index, | |
290 | oif_index, | |
291 | gifaddr_str, | |
292 | sifaddr_str); | |
293 | } | |
294 | ||
295 | break; | |
296 | } | |
297 | } | |
298 | ||
299 | if (!node) { | |
300 | char gifaddr_str[100]; | |
301 | char sifaddr_str[100]; | |
302 | pim_inet4_dump("<ifaddr?>", group, gifaddr_str, sizeof(gifaddr_str)); | |
303 | pim_inet4_dump("<ifaddr?>", source, sifaddr_str, sizeof(sifaddr_str)); | |
304 | zlog_warn("%s %s: Unable to remove static route: Route does not exist(iif=%d,oif=%d,group=%s,source=%s)", | |
305 | __FILE__, __PRETTY_FUNCTION__, | |
306 | iif_index, | |
307 | oif_index, | |
308 | gifaddr_str, | |
309 | sifaddr_str); | |
310 | return -3; | |
311 | } | |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | int | |
317 | pim_static_write_mroute (struct vty *vty, struct interface *ifp) | |
318 | { | |
319 | struct listnode *node; | |
320 | struct static_route *sroute; | |
321 | int count = 0; | |
322 | char sbuf[100]; | |
323 | char gbuf[100]; | |
324 | ||
325 | for (ALL_LIST_ELEMENTS_RO (qpim_static_route_list, node, sroute)) | |
326 | { | |
327 | pim_inet4_dump ("<ifaddr?>", sroute->group, gbuf, sizeof (gbuf)); | |
328 | pim_inet4_dump ("<ifaddr?>", sroute->source, sbuf, sizeof (sbuf)); | |
329 | if (sroute->iif == ifp->ifindex) | |
330 | { | |
331 | int i; | |
332 | for (i = 0; i < MAXVIFS; i++) | |
333 | if (sroute->oif_ttls[i]) | |
334 | { | |
335 | struct interface *oifp = if_lookup_by_index (i); | |
336 | vty_out (vty, " ip mroute %s %s %s%s", oifp->name, gbuf, sbuf, VTY_NEWLINE); | |
337 | count ++; | |
338 | } | |
339 | } | |
340 | } | |
341 | ||
342 | return count; | |
343 | } |