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1 | /* | |
2 | * pim_bfd.c: PIM BFD handling routines | |
3 | * | |
4 | * Copyright (C) 2017 Cumulus Networks, Inc. | |
5 | * Chirag Shah | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or | |
10 | * (at your option) any later version. | |
11 | * | |
12 | * This program 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 this program; see the file COPYING; if not, write to the | |
19 | * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
20 | * MA 02110-1301 USA | |
21 | */ | |
22 | ||
23 | #include <zebra.h> | |
24 | ||
25 | #include "lib/json.h" | |
26 | #include "command.h" | |
27 | #include "vty.h" | |
28 | #include "zclient.h" | |
29 | ||
30 | #include "pim_instance.h" | |
31 | #include "pim_cmd.h" | |
32 | #include "pim_vty.h" | |
33 | #include "pim_iface.h" | |
34 | #include "pim_bfd.h" | |
35 | #include "bfd.h" | |
36 | #include "pimd.h" | |
37 | #include "pim_zebra.h" | |
38 | ||
39 | /* | |
40 | * pim_bfd_write_config - Write the interface BFD configuration. | |
41 | */ | |
42 | void pim_bfd_write_config(struct vty *vty, struct interface *ifp) | |
43 | { | |
44 | struct pim_interface *pim_ifp = ifp->info; | |
45 | ||
46 | if (!pim_ifp || !pim_ifp->bfd_config.enabled) | |
47 | return; | |
48 | ||
49 | #if HAVE_BFDD == 0 | |
50 | if (pim_ifp->bfd_config.detection_multiplier != BFD_DEF_DETECT_MULT | |
51 | || pim_ifp->bfd_config.min_rx != BFD_DEF_MIN_RX | |
52 | || pim_ifp->bfd_config.min_tx != BFD_DEF_MIN_TX) | |
53 | vty_out(vty, " ip pim bfd %d %d %d\n", | |
54 | pim_ifp->bfd_config.detection_multiplier, | |
55 | pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx); | |
56 | else | |
57 | #endif /* ! HAVE_BFDD */ | |
58 | vty_out(vty, " ip pim bfd\n"); | |
59 | ||
60 | if (pim_ifp->bfd_config.profile) | |
61 | vty_out(vty, " ip pim bfd profile %s\n", | |
62 | pim_ifp->bfd_config.profile); | |
63 | } | |
64 | ||
65 | static void pim_neighbor_bfd_cb(struct bfd_session_params *bsp, | |
66 | const struct bfd_session_status *bss, void *arg) | |
67 | { | |
68 | struct pim_neighbor *nbr = arg; | |
69 | ||
70 | if (PIM_DEBUG_PIM_TRACE) { | |
71 | zlog_debug("%s: status %s old_status %s", __func__, | |
72 | bfd_get_status_str(bss->state), | |
73 | bfd_get_status_str(bss->previous_state)); | |
74 | } | |
75 | ||
76 | if (bss->state == BFD_STATUS_DOWN | |
77 | && bss->previous_state == BFD_STATUS_UP) | |
78 | pim_neighbor_delete(nbr->interface, nbr, "BFD Session Expired"); | |
79 | } | |
80 | ||
81 | /* | |
82 | * pim_bfd_info_nbr_create - Create/update BFD information for a neighbor. | |
83 | */ | |
84 | void pim_bfd_info_nbr_create(struct pim_interface *pim_ifp, | |
85 | struct pim_neighbor *neigh) | |
86 | { | |
87 | /* Check if Pim Interface BFD is enabled */ | |
88 | if (!pim_ifp || !pim_ifp->bfd_config.enabled) | |
89 | return; | |
90 | ||
91 | if (neigh->bfd_session == NULL) | |
92 | neigh->bfd_session = bfd_sess_new(pim_neighbor_bfd_cb, neigh); | |
93 | ||
94 | bfd_sess_set_timers( | |
95 | neigh->bfd_session, pim_ifp->bfd_config.detection_multiplier, | |
96 | pim_ifp->bfd_config.min_rx, pim_ifp->bfd_config.min_tx); | |
97 | bfd_sess_set_ipv4_addrs(neigh->bfd_session, NULL, &neigh->source_addr); | |
98 | bfd_sess_set_interface(neigh->bfd_session, neigh->interface->name); | |
99 | bfd_sess_set_vrf(neigh->bfd_session, neigh->interface->vrf_id); | |
100 | bfd_sess_set_profile(neigh->bfd_session, pim_ifp->bfd_config.profile); | |
101 | bfd_sess_install(neigh->bfd_session); | |
102 | } | |
103 | ||
104 | /* | |
105 | * pim_bfd_reg_dereg_all_nbr - Register/Deregister all neighbors associated | |
106 | * with a interface with BFD through | |
107 | * zebra for starting/stopping the monitoring of | |
108 | * the neighbor rechahability. | |
109 | */ | |
110 | void pim_bfd_reg_dereg_all_nbr(struct interface *ifp) | |
111 | { | |
112 | struct pim_interface *pim_ifp = NULL; | |
113 | struct listnode *node = NULL; | |
114 | struct pim_neighbor *neigh = NULL; | |
115 | ||
116 | pim_ifp = ifp->info; | |
117 | if (!pim_ifp) | |
118 | return; | |
119 | ||
120 | for (ALL_LIST_ELEMENTS_RO(pim_ifp->pim_neighbor_list, node, neigh)) { | |
121 | if (pim_ifp->bfd_config.enabled) | |
122 | pim_bfd_info_nbr_create(pim_ifp, neigh); | |
123 | else | |
124 | bfd_sess_free(&neigh->bfd_session); | |
125 | } | |
126 | } | |
127 | ||
128 | void pim_bfd_init(void) | |
129 | { | |
130 | bfd_protocol_integration_init(pim_zebra_zclient_get(), router->master); | |
131 | } |