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eb5d44eb | 1 | /* |
2 | * IS-IS Rout(e)ing protocol - isis_csm.c | |
3 | * IS-IS circuit state machine | |
4 | * Copyright (C) 2001,2002 Sampo Saaristo | |
d62a17ae | 5 | * Tampere University of Technology |
eb5d44eb | 6 | * Institute of Communications Engineering |
7 | * | |
d62a17ae | 8 | * This program is free software; you can redistribute it and/or modify it |
9 | * under the terms of the GNU General Public Licenseas published by the Free | |
10 | * Software Foundation; either version 2 of the License, or (at your option) | |
eb5d44eb | 11 | * any later version. |
12 | * | |
d62a17ae | 13 | * This program is distributed in the hope that it will be useful,but WITHOUT |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
eb5d44eb | 16 | * more details. |
17 | * | |
896014f4 DL |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; see the file COPYING; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
eb5d44eb | 21 | */ |
22 | ||
23 | #include <zebra.h> | |
eb5d44eb | 24 | |
25 | #include "log.h" | |
26 | #include "memory.h" | |
27 | #include "if.h" | |
28 | #include "linklist.h" | |
29 | #include "command.h" | |
30 | #include "thread.h" | |
31 | #include "hash.h" | |
32 | #include "prefix.h" | |
33 | #include "stream.h" | |
34 | ||
35 | #include "isisd/dict.h" | |
eb5d44eb | 36 | #include "isisd/isis_constants.h" |
37 | #include "isisd/isis_common.h" | |
3f045a08 | 38 | #include "isisd/isis_flags.h" |
eb5d44eb | 39 | #include "isisd/isis_circuit.h" |
eb5d44eb | 40 | #include "isisd/isis_lsp.h" |
41 | #include "isisd/isis_pdu.h" | |
42 | #include "isisd/isis_network.h" | |
43 | #include "isisd/isis_misc.h" | |
44 | #include "isisd/isis_constants.h" | |
45 | #include "isisd/isis_adjacency.h" | |
46 | #include "isisd/isis_dr.h" | |
eb5d44eb | 47 | #include "isisd/isisd.h" |
48 | #include "isisd/isis_csm.h" | |
49 | #include "isisd/isis_events.h" | |
54ece698 | 50 | #include "isisd/isis_errors.h" |
eb5d44eb | 51 | |
52 | extern struct isis *isis; | |
53 | ||
d62a17ae | 54 | static const char *csm_statestr[] = {"C_STATE_NA", "C_STATE_INIT", |
55 | "C_STATE_CONF", "C_STATE_UP"}; | |
eb5d44eb | 56 | |
57 | #define STATE2STR(S) csm_statestr[S] | |
58 | ||
1cd80845 | 59 | static const char *csm_eventstr[] = { |
d62a17ae | 60 | "NO_STATE", "ISIS_ENABLE", "IF_UP_FROM_Z", |
61 | "ISIS_DISABLE", "IF_DOWN_FROM_Z", | |
eb5d44eb | 62 | }; |
63 | ||
64 | #define EVENT2STR(E) csm_eventstr[E] | |
65 | ||
f390d2c7 | 66 | struct isis_circuit * |
d62a17ae | 67 | isis_csm_state_change(int event, struct isis_circuit *circuit, void *arg) |
eb5d44eb | 68 | { |
d62a17ae | 69 | int old_state; |
eb5d44eb | 70 | |
d62a17ae | 71 | old_state = circuit ? circuit->state : C_STATE_NA; |
72 | if (isis->debugs & DEBUG_EVENTS) | |
73 | zlog_debug("CSM_EVENT: %s", EVENT2STR(event)); | |
f390d2c7 | 74 | |
d62a17ae | 75 | switch (old_state) { |
76 | case C_STATE_NA: | |
77 | if (circuit) | |
78 | zlog_warn("Non-null circuit while state C_STATE_NA"); | |
79 | assert(circuit == NULL); | |
80 | switch (event) { | |
81 | case ISIS_ENABLE: | |
82 | circuit = isis_circuit_new(); | |
83 | isis_circuit_configure(circuit, | |
84 | (struct isis_area *)arg); | |
85 | circuit->state = C_STATE_CONF; | |
86 | break; | |
87 | case IF_UP_FROM_Z: | |
88 | circuit = isis_circuit_new(); | |
89 | isis_circuit_if_add(circuit, (struct interface *)arg); | |
90 | listnode_add(isis->init_circ_list, circuit); | |
91 | circuit->state = C_STATE_INIT; | |
92 | break; | |
93 | case ISIS_DISABLE: | |
94 | zlog_warn("circuit already disabled"); | |
95 | break; | |
96 | case IF_DOWN_FROM_Z: | |
97 | zlog_warn("circuit already disconnected"); | |
98 | break; | |
99 | } | |
100 | break; | |
101 | case C_STATE_INIT: | |
102 | assert(circuit); | |
103 | switch (event) { | |
104 | case ISIS_ENABLE: | |
105 | isis_circuit_configure(circuit, | |
106 | (struct isis_area *)arg); | |
107 | if (isis_circuit_up(circuit) != ISIS_OK) { | |
108 | isis_circuit_deconfigure( | |
109 | circuit, (struct isis_area *)arg); | |
110 | break; | |
111 | } | |
112 | circuit->state = C_STATE_UP; | |
113 | isis_event_circuit_state_change(circuit, circuit->area, | |
114 | 1); | |
115 | listnode_delete(isis->init_circ_list, circuit); | |
116 | break; | |
117 | case IF_UP_FROM_Z: | |
118 | assert(circuit); | |
119 | zlog_warn("circuit already connected"); | |
120 | break; | |
121 | case ISIS_DISABLE: | |
122 | zlog_warn("circuit already disabled"); | |
123 | break; | |
124 | case IF_DOWN_FROM_Z: | |
125 | isis_circuit_if_del(circuit, (struct interface *)arg); | |
126 | listnode_delete(isis->init_circ_list, circuit); | |
127 | isis_circuit_del(circuit); | |
128 | circuit = NULL; | |
129 | break; | |
130 | } | |
131 | break; | |
132 | case C_STATE_CONF: | |
133 | assert(circuit); | |
134 | switch (event) { | |
135 | case ISIS_ENABLE: | |
136 | zlog_warn("circuit already enabled"); | |
137 | break; | |
138 | case IF_UP_FROM_Z: | |
139 | isis_circuit_if_add(circuit, (struct interface *)arg); | |
140 | if (isis_circuit_up(circuit) != ISIS_OK) { | |
af4c2728 | 141 | flog_err( |
1a7ecb96 | 142 | EC_ISIS_CONFIG, |
d62a17ae | 143 | "Could not bring up %s because of invalid config.", |
144 | circuit->interface->name); | |
af4c2728 | 145 | flog_err( |
1a7ecb96 | 146 | EC_ISIS_CONFIG, |
d62a17ae | 147 | "Clearing config for %s. Please re-examine it.", |
148 | circuit->interface->name); | |
149 | if (circuit->ip_router) { | |
150 | circuit->ip_router = 0; | |
151 | circuit->area->ip_circuits--; | |
152 | } | |
153 | if (circuit->ipv6_router) { | |
154 | circuit->ipv6_router = 0; | |
155 | circuit->area->ipv6_circuits--; | |
156 | } | |
157 | circuit_update_nlpids(circuit); | |
158 | isis_circuit_deconfigure(circuit, | |
159 | circuit->area); | |
160 | listnode_add(isis->init_circ_list, circuit); | |
161 | circuit->state = C_STATE_INIT; | |
162 | break; | |
163 | } | |
164 | circuit->state = C_STATE_UP; | |
165 | isis_event_circuit_state_change(circuit, circuit->area, | |
166 | 1); | |
167 | break; | |
168 | case ISIS_DISABLE: | |
169 | isis_circuit_deconfigure(circuit, | |
170 | (struct isis_area *)arg); | |
171 | isis_circuit_del(circuit); | |
172 | circuit = NULL; | |
173 | break; | |
174 | case IF_DOWN_FROM_Z: | |
175 | zlog_warn("circuit already disconnected"); | |
176 | break; | |
177 | } | |
178 | break; | |
179 | case C_STATE_UP: | |
180 | assert(circuit); | |
181 | switch (event) { | |
182 | case ISIS_ENABLE: | |
183 | zlog_warn("circuit already configured"); | |
184 | break; | |
185 | case IF_UP_FROM_Z: | |
186 | zlog_warn("circuit already connected"); | |
187 | break; | |
188 | case ISIS_DISABLE: | |
189 | isis_circuit_down(circuit); | |
190 | isis_circuit_deconfigure(circuit, | |
191 | (struct isis_area *)arg); | |
192 | circuit->state = C_STATE_INIT; | |
193 | isis_event_circuit_state_change( | |
194 | circuit, (struct isis_area *)arg, 0); | |
195 | listnode_add(isis->init_circ_list, circuit); | |
196 | break; | |
197 | case IF_DOWN_FROM_Z: | |
198 | isis_circuit_down(circuit); | |
199 | isis_circuit_if_del(circuit, (struct interface *)arg); | |
200 | circuit->state = C_STATE_CONF; | |
201 | isis_event_circuit_state_change(circuit, circuit->area, | |
202 | 0); | |
203 | break; | |
204 | } | |
205 | break; | |
f390d2c7 | 206 | |
d62a17ae | 207 | default: |
208 | zlog_warn("Invalid circuit state %d", old_state); | |
209 | } | |
f390d2c7 | 210 | |
d62a17ae | 211 | if (isis->debugs & DEBUG_EVENTS) |
212 | zlog_debug("CSM_STATE_CHANGE: %s -> %s ", STATE2STR(old_state), | |
213 | circuit ? STATE2STR(circuit->state) | |
214 | : STATE2STR(C_STATE_NA)); | |
eb5d44eb | 215 | |
d62a17ae | 216 | return circuit; |
eb5d44eb | 217 | } |