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15a5dafe | 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 | * | |
896014f4 DL |
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 | |
15a5dafe | 18 | */ |
19 | ||
9e6fca3a | 20 | #include <zebra.h> |
21 | ||
15a5dafe | 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 | ||
28 | #include "pimd.h" | |
29 | #include "pim_ssm.h" | |
30 | #include "pim_zebra.h" | |
31 | ||
32 | static void | |
33 | pim_ssm_range_reevaluate (void) | |
34 | { | |
35 | /* 1. Setup register state for (S,G) entries if G has changed from SSM to | |
36 | * ASM. | |
37 | * 2. check existing (*,G) IGMP registrations to see if they are | |
38 | * still ASM. if they are now SSM delete them. | |
39 | * 3. Allow channel setup for IGMP (*,G) members if G is now ASM | |
40 | * 4. I could tear down all (*,G), (S,G,rpt) states. But that is an | |
41 | * unnecessary sladge hammer and may not be particularly useful as it is | |
42 | * likely the SPT switchover has already happened for flows along such RPTs. | |
43 | * As for the RPT states it seems that the best thing to do is let them age | |
44 | * out gracefully. As long as the FHR and LHR do the right thing RPTs will | |
45 | * disappear in time for SSM groups. | |
46 | */ | |
47 | pim_upstream_register_reevaluate (); | |
48 | igmp_source_forward_reevaluate_all (); | |
49 | } | |
50 | ||
51 | void | |
52 | pim_ssm_prefix_list_update (struct prefix_list *plist) | |
53 | { | |
54 | struct pim_ssm *ssm = pimg->ssm_info; | |
55 | ||
56 | if (!ssm->plist_name || strcmp (ssm->plist_name, prefix_list_name (plist))) | |
57 | { | |
58 | /* not ours */ | |
59 | return; | |
60 | } | |
61 | ||
62 | pim_ssm_range_reevaluate (); | |
63 | } | |
64 | ||
65 | static int | |
66 | pim_is_grp_standard_ssm (struct prefix *group) | |
67 | { | |
68 | static int first = 1; | |
69 | static struct prefix group_ssm; | |
70 | ||
71 | if (first) | |
72 | { | |
73 | str2prefix (PIM_SSM_STANDARD_RANGE, &group_ssm); | |
74 | first = 0; | |
75 | } | |
76 | ||
77 | return prefix_match (&group_ssm, group); | |
78 | } | |
79 | ||
80 | int | |
81 | pim_is_grp_ssm (struct in_addr group_addr) | |
82 | { | |
83 | struct pim_ssm *ssm; | |
84 | struct prefix group; | |
85 | struct prefix_list *plist; | |
86 | ||
87 | memset (&group, 0, sizeof (group)); | |
88 | group.family = AF_INET; | |
89 | group.u.prefix4 = group_addr; | |
90 | group.prefixlen = 32; | |
91 | ||
92 | ssm = pimg->ssm_info; | |
93 | if (!ssm->plist_name) | |
94 | { | |
95 | return pim_is_grp_standard_ssm (&group); | |
96 | } | |
97 | ||
98 | plist = prefix_list_lookup (AFI_IP, ssm->plist_name); | |
99 | if (!plist) | |
100 | return 0; | |
101 | ||
102 | return (prefix_list_apply (plist, &group) == PREFIX_PERMIT); | |
103 | } | |
104 | ||
105 | int | |
106 | pim_ssm_range_set (vrf_id_t vrf_id, const char *plist_name) | |
107 | { | |
108 | struct pim_ssm *ssm; | |
109 | int change = 0; | |
110 | ||
111 | if (vrf_id != VRF_DEFAULT) | |
112 | return PIM_SSM_ERR_NO_VRF; | |
113 | ||
114 | ssm = pimg->ssm_info; | |
115 | if (plist_name) | |
116 | { | |
117 | if (ssm->plist_name) | |
118 | { | |
119 | if (!strcmp (ssm->plist_name, plist_name)) | |
120 | return PIM_SSM_ERR_DUP; | |
121 | XFREE (MTYPE_PIM_FILTER_NAME, ssm->plist_name); | |
122 | } | |
123 | ssm->plist_name = XSTRDUP (MTYPE_PIM_FILTER_NAME, plist_name); | |
124 | change = 1; | |
125 | } | |
126 | else | |
127 | { | |
128 | if (ssm->plist_name) | |
129 | { | |
130 | change = 1; | |
131 | XFREE (MTYPE_PIM_FILTER_NAME, ssm->plist_name); | |
132 | } | |
133 | } | |
134 | ||
135 | if (change) | |
136 | pim_ssm_range_reevaluate (); | |
137 | ||
138 | return PIM_SSM_ERR_NONE; | |
139 | } | |
140 | ||
141 | void * | |
142 | pim_ssm_init (vrf_id_t vrf_id) | |
143 | { | |
144 | struct pim_ssm *ssm; | |
145 | ||
146 | ssm = XCALLOC (MTYPE_PIM_SSM_INFO, sizeof (*ssm)); | |
147 | ssm->vrf_id = vrf_id; | |
148 | ||
149 | return ssm; | |
150 | } | |
151 | ||
152 | void | |
153 | pim_ssm_terminate (struct pim_ssm *ssm) | |
154 | { | |
155 | if (ssm && ssm->plist_name) | |
156 | XFREE (MTYPE_PIM_FILTER_NAME, ssm->plist_name); | |
157 | } |