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c262df82 RW |
1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* | |
3 | * RIP BFD integration. | |
4 | * Copyright (C) 2021-2023 Network Device Education Foundation, Inc. ("NetDEF") | |
5 | */ | |
6 | ||
7 | #include <zebra.h> | |
8 | ||
9 | #include "lib/zclient.h" | |
10 | #include "lib/bfd.h" | |
11 | ||
12 | #include "ripd/ripd.h" | |
13 | #include "ripd/rip_bfd.h" | |
14 | #include "ripd/rip_debug.h" | |
15 | ||
16 | extern struct zclient *zclient; | |
17 | ||
18 | static const char *rip_bfd_interface_profile(struct rip_interface *ri) | |
19 | { | |
20 | struct rip *rip = ri->rip; | |
21 | ||
22 | if (ri->bfd.profile) | |
23 | return ri->bfd.profile; | |
24 | ||
25 | if (rip->default_bfd_profile) | |
26 | return rip->default_bfd_profile; | |
27 | ||
28 | return NULL; | |
29 | } | |
30 | ||
31 | static void rip_bfd_session_change(struct bfd_session_params *bsp, | |
32 | const struct bfd_session_status *bss, | |
33 | void *arg) | |
34 | { | |
35 | struct rip_peer *rp = arg; | |
36 | ||
37 | /* BFD peer went down. */ | |
38 | if (bss->state == BFD_STATUS_DOWN && | |
39 | bss->previous_state == BFD_STATUS_UP) { | |
40 | if (IS_RIP_DEBUG_EVENT) | |
41 | zlog_debug("%s: peer %pI4: BFD Down", __func__, | |
42 | &rp->addr); | |
43 | ||
44 | rip_peer_delete_routes(rp); | |
45 | listnode_delete(rp->rip->peer_list, rp); | |
46 | rip_peer_free(rp); | |
47 | return; | |
48 | } | |
49 | ||
50 | /* BFD peer went up. */ | |
51 | if (bss->state == BSS_UP && bss->previous_state == BSS_DOWN) | |
52 | if (IS_RIP_DEBUG_EVENT) | |
53 | zlog_debug("%s: peer %pI4: BFD Up", __func__, | |
54 | &rp->addr); | |
55 | } | |
56 | ||
57 | void rip_bfd_session_update(struct rip_peer *rp) | |
58 | { | |
59 | struct rip_interface *ri = rp->ri; | |
60 | ||
61 | /* BFD configuration was removed. */ | |
62 | if (ri == NULL || !ri->bfd.enabled) { | |
63 | bfd_sess_free(&rp->bfd_session); | |
64 | return; | |
65 | } | |
66 | ||
67 | /* New BFD session. */ | |
68 | if (rp->bfd_session == NULL) { | |
69 | rp->bfd_session = bfd_sess_new(rip_bfd_session_change, rp); | |
70 | bfd_sess_set_ipv4_addrs(rp->bfd_session, NULL, &rp->addr); | |
71 | bfd_sess_set_interface(rp->bfd_session, ri->ifp->name); | |
72 | bfd_sess_set_vrf(rp->bfd_session, rp->rip->vrf->vrf_id); | |
73 | } | |
74 | ||
75 | /* Set new configuration. */ | |
76 | bfd_sess_set_timers(rp->bfd_session, BFD_DEF_DETECT_MULT, | |
77 | BFD_DEF_MIN_RX, BFD_DEF_MIN_TX); | |
78 | bfd_sess_set_profile(rp->bfd_session, rip_bfd_interface_profile(ri)); | |
79 | ||
80 | bfd_sess_install(rp->bfd_session); | |
81 | } | |
82 | ||
83 | void rip_bfd_interface_update(struct rip_interface *ri) | |
84 | { | |
85 | struct rip *rip; | |
86 | struct rip_peer *rp; | |
87 | struct listnode *node; | |
88 | ||
89 | rip = ri->rip; | |
90 | if (!rip) | |
91 | return; | |
92 | ||
93 | for (ALL_LIST_ELEMENTS_RO(rip->peer_list, node, rp)) { | |
94 | if (rp->ri != ri) | |
95 | continue; | |
96 | ||
97 | rip_bfd_session_update(rp); | |
98 | } | |
99 | } | |
100 | ||
101 | void rip_bfd_instance_update(struct rip *rip) | |
102 | { | |
103 | struct interface *ifp; | |
104 | ||
105 | FOR_ALL_INTERFACES (rip->vrf, ifp) { | |
106 | struct rip_interface *ri; | |
107 | ||
108 | ri = ifp->info; | |
109 | if (!ri) | |
110 | continue; | |
111 | ||
112 | rip_bfd_interface_update(ri); | |
113 | } | |
114 | } | |
115 | ||
116 | void rip_bfd_init(struct event_loop *tm) | |
117 | { | |
118 | bfd_protocol_integration_init(zclient, tm); | |
119 | } |