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1 | /* | |
2 | * IP SSM ranges for FRR | |
3 | * Copyright (C) 2017 Cumulus Networks, Inc. | |
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 along | |
16 | * with this program; see the file COPYING; if not, write to the Free Software | |
17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | */ | |
19 | ||
20 | #include <zebra.h> | |
21 | ||
22 | #include <lib/linklist.h> | |
23 | #include <lib/prefix.h> | |
24 | #include <lib/vty.h> | |
25 | #include <lib/vrf.h> | |
26 | #include <lib/plist.h> | |
27 | #include <lib/lib_errors.h> | |
28 | ||
29 | #include "pimd.h" | |
30 | #include "pim_ssm.h" | |
31 | #include "pim_zebra.h" | |
32 | ||
33 | static void pim_ssm_range_reevaluate(struct pim_instance *pim) | |
34 | { | |
35 | /* 1. Setup register state for (S,G) entries if G has changed from SSM | |
36 | * to | |
37 | * ASM. | |
38 | * 2. check existing (*,G) IGMP registrations to see if they are | |
39 | * still ASM. if they are now SSM delete them. | |
40 | * 3. Allow channel setup for IGMP (*,G) members if G is now ASM | |
41 | * 4. I could tear down all (*,G), (S,G,rpt) states. But that is an | |
42 | * unnecessary sladge hammer and may not be particularly useful as it is | |
43 | * likely the SPT switchover has already happened for flows along such | |
44 | * RPTs. | |
45 | * As for the RPT states it seems that the best thing to do is let them | |
46 | * age | |
47 | * out gracefully. As long as the FHR and LHR do the right thing RPTs | |
48 | * will | |
49 | * disappear in time for SSM groups. | |
50 | */ | |
51 | pim_upstream_register_reevaluate(pim); | |
52 | igmp_source_forward_reevaluate_all(pim); | |
53 | } | |
54 | ||
55 | void pim_ssm_prefix_list_update(struct pim_instance *pim, | |
56 | struct prefix_list *plist) | |
57 | { | |
58 | struct pim_ssm *ssm = pim->ssm_info; | |
59 | ||
60 | if (!ssm->plist_name | |
61 | || strcmp(ssm->plist_name, prefix_list_name(plist))) { | |
62 | /* not ours */ | |
63 | return; | |
64 | } | |
65 | ||
66 | pim_ssm_range_reevaluate(pim); | |
67 | } | |
68 | ||
69 | static int pim_is_grp_standard_ssm(struct prefix *group) | |
70 | { | |
71 | static int first = 1; | |
72 | static struct prefix group_ssm; | |
73 | ||
74 | if (first) { | |
75 | if (!str2prefix(PIM_SSM_STANDARD_RANGE, &group_ssm)) | |
76 | flog_err(EC_LIB_DEVELOPMENT, | |
77 | "%s: Failure to Read Group Address: %s", | |
78 | __PRETTY_FUNCTION__, PIM_SSM_STANDARD_RANGE); | |
79 | ||
80 | first = 0; | |
81 | } | |
82 | ||
83 | return prefix_match(&group_ssm, group); | |
84 | } | |
85 | ||
86 | int pim_is_grp_ssm(struct pim_instance *pim, struct in_addr group_addr) | |
87 | { | |
88 | struct pim_ssm *ssm; | |
89 | struct prefix group; | |
90 | struct prefix_list *plist; | |
91 | ||
92 | memset(&group, 0, sizeof(group)); | |
93 | group.family = AF_INET; | |
94 | group.u.prefix4 = group_addr; | |
95 | group.prefixlen = 32; | |
96 | ||
97 | ssm = pim->ssm_info; | |
98 | if (!ssm->plist_name) { | |
99 | return pim_is_grp_standard_ssm(&group); | |
100 | } | |
101 | ||
102 | plist = prefix_list_lookup(AFI_IP, ssm->plist_name); | |
103 | if (!plist) | |
104 | return 0; | |
105 | ||
106 | return (prefix_list_apply(plist, &group) == PREFIX_PERMIT); | |
107 | } | |
108 | ||
109 | int pim_ssm_range_set(struct pim_instance *pim, vrf_id_t vrf_id, | |
110 | const char *plist_name) | |
111 | { | |
112 | struct pim_ssm *ssm; | |
113 | int change = 0; | |
114 | ||
115 | if (vrf_id != pim->vrf_id) | |
116 | return PIM_SSM_ERR_NO_VRF; | |
117 | ||
118 | ssm = pim->ssm_info; | |
119 | if (plist_name) { | |
120 | if (ssm->plist_name) { | |
121 | if (!strcmp(ssm->plist_name, plist_name)) | |
122 | return PIM_SSM_ERR_DUP; | |
123 | XFREE(MTYPE_PIM_FILTER_NAME, ssm->plist_name); | |
124 | } | |
125 | ssm->plist_name = XSTRDUP(MTYPE_PIM_FILTER_NAME, plist_name); | |
126 | change = 1; | |
127 | } else { | |
128 | if (ssm->plist_name) { | |
129 | change = 1; | |
130 | XFREE(MTYPE_PIM_FILTER_NAME, ssm->plist_name); | |
131 | } | |
132 | } | |
133 | ||
134 | if (change) | |
135 | pim_ssm_range_reevaluate(pim); | |
136 | ||
137 | return PIM_SSM_ERR_NONE; | |
138 | } | |
139 | ||
140 | void *pim_ssm_init(void) | |
141 | { | |
142 | struct pim_ssm *ssm; | |
143 | ||
144 | ssm = XCALLOC(MTYPE_PIM_SSM_INFO, sizeof(*ssm)); | |
145 | ||
146 | return ssm; | |
147 | } | |
148 | ||
149 | void pim_ssm_terminate(struct pim_ssm *ssm) | |
150 | { | |
151 | if (!ssm) | |
152 | return; | |
153 | ||
154 | if (ssm->plist_name) | |
155 | XFREE(MTYPE_PIM_FILTER_NAME, ssm->plist_name); | |
156 | ||
157 | XFREE(MTYPE_PIM_SSM_INFO, ssm); | |
158 | } |