]>
Commit | Line | Data |
---|---|---|
acddc0ed | 1 | // SPDX-License-Identifier: MIT |
ca10883e DS |
2 | /* |
3 | Copyright (c) 2007, 2008 by Juliusz Chroboczek | |
ca10883e DS |
4 | */ |
5 | ||
b45ac5f5 DL |
6 | #ifdef HAVE_CONFIG_H |
7 | #include "config.h" | |
8 | #endif | |
9 | ||
ca10883e DS |
10 | #include <stdlib.h> |
11 | #include <stdio.h> | |
12 | #include <string.h> | |
13 | #include <sys/time.h> | |
14 | ||
15 | #include "babel_main.h" | |
16 | #include "babeld.h" | |
17 | #include "util.h" | |
18 | #include "source.h" | |
19 | #include "babel_interface.h" | |
20 | #include "route.h" | |
e33b116c | 21 | #include "babel_errors.h" |
ca10883e DS |
22 | |
23 | struct source *srcs = NULL; | |
24 | ||
25 | struct source* | |
26 | find_source(const unsigned char *id, const unsigned char *p, unsigned char plen, | |
27 | int create, unsigned short seqno) | |
28 | { | |
29 | struct source *src; | |
30 | ||
31 | for(src = srcs; src; src = src->next) { | |
32 | /* This should really be a hash table. For now, check the | |
33 | last byte first. */ | |
34 | if(src->id[7] != id[7]) | |
35 | continue; | |
36 | if(memcmp(src->id, id, 8) != 0) | |
37 | continue; | |
38 | if(src->plen != plen) | |
39 | continue; | |
40 | if(memcmp(src->prefix, p, 16) == 0) | |
41 | return src; | |
42 | } | |
43 | ||
44 | if(!create) | |
45 | return NULL; | |
46 | ||
47 | src = malloc(sizeof(struct source)); | |
48 | if(src == NULL) { | |
5b003f31 | 49 | flog_err(EC_BABEL_MEMORY, "malloc(source): %s", safe_strerror(errno)); |
ca10883e DS |
50 | return NULL; |
51 | } | |
52 | ||
53 | memcpy(src->id, id, 8); | |
54 | memcpy(src->prefix, p, 16); | |
55 | src->plen = plen; | |
56 | src->seqno = seqno; | |
57 | src->metric = INFINITY; | |
58 | src->time = babel_now.tv_sec; | |
59 | src->route_count = 0; | |
60 | src->next = srcs; | |
61 | srcs = src; | |
62 | return src; | |
63 | } | |
64 | ||
65 | struct source * | |
66 | retain_source(struct source *src) | |
67 | { | |
68 | assert(src->route_count < 0xffff); | |
69 | src->route_count++; | |
70 | return src; | |
71 | } | |
72 | ||
73 | void | |
74 | release_source(struct source *src) | |
75 | { | |
76 | assert(src->route_count > 0); | |
77 | src->route_count--; | |
78 | } | |
79 | ||
80 | int | |
81 | flush_source(struct source *src) | |
82 | { | |
83 | if(src->route_count > 0) | |
84 | /* The source is in use by a route. */ | |
85 | return 0; | |
86 | ||
87 | if(srcs == src) { | |
88 | srcs = src->next; | |
89 | } else { | |
90 | struct source *previous = srcs; | |
91 | while(previous->next != src) | |
92 | previous = previous->next; | |
93 | previous->next = src->next; | |
94 | } | |
95 | ||
96 | free(src); | |
97 | return 1; | |
98 | } | |
99 | ||
100 | void | |
101 | update_source(struct source *src, | |
102 | unsigned short seqno, unsigned short metric) | |
103 | { | |
104 | if(metric >= INFINITY) | |
105 | return; | |
106 | ||
107 | /* If a source is expired, pretend that it doesn't exist and update | |
108 | it unconditionally. This makes ensures that old data will | |
109 | eventually be overridden, and prevents us from getting stuck if | |
110 | a router loses its sequence number. */ | |
111 | if(src->time < babel_now.tv_sec - SOURCE_GC_TIME || | |
112 | seqno_compare(src->seqno, seqno) < 0 || | |
113 | (src->seqno == seqno && src->metric > metric)) { | |
114 | src->seqno = seqno; | |
115 | src->metric = metric; | |
116 | } | |
117 | src->time = babel_now.tv_sec; | |
118 | } | |
119 | ||
120 | void | |
4d762f26 | 121 | expire_sources(void) |
ca10883e DS |
122 | { |
123 | struct source *src; | |
124 | ||
125 | src = srcs; | |
126 | while(src) { | |
127 | if(src->time > babel_now.tv_sec) | |
128 | /* clock stepped */ | |
129 | src->time = babel_now.tv_sec; | |
130 | if(src->time < babel_now.tv_sec - SOURCE_GC_TIME) { | |
131 | struct source *old = src; | |
132 | src = src->next; | |
133 | flush_source(old); | |
134 | continue; | |
135 | } | |
136 | src = src->next; | |
137 | } | |
138 | } | |
139 | ||
140 | void | |
141 | check_sources_released(void) | |
142 | { | |
143 | struct source *src; | |
144 | ||
145 | for(src = srcs; src; src = src->next) { | |
146 | if(src->route_count != 0) | |
147 | fprintf(stderr, "Warning: source %s %s has refcount %d.\n", | |
148 | format_eui64(src->id), | |
149 | format_prefix(src->prefix, src->plen), | |
150 | (int)src->route_count); | |
151 | } | |
152 | } |