File: | src/usr.sbin/bgpd/carp.c |
Warning: | line 64, column 7 Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' |
Press '?' to see keyboard shortcuts
Keyboard shortcuts:
1 | /* $OpenBSD: carp.c,v 1.11 2022/08/17 15:15:25 claudio Exp $ */ |
2 | |
3 | /* |
4 | * Copyright (c) 2006 Henning Brauer <henning@openbsd.org> |
5 | * |
6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above |
8 | * copyright notice and this permission notice appear in all copies. |
9 | * |
10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 | */ |
18 | |
19 | #include <sys/types.h> |
20 | #include <sys/socket.h> |
21 | #include <sys/ioctl.h> |
22 | #include <net/if.h> |
23 | |
24 | #include <errno(*__errno()).h> |
25 | #include <string.h> |
26 | #include <stdlib.h> |
27 | #include <unistd.h> |
28 | |
29 | #include "bgpd.h" |
30 | #include "session.h" |
31 | #include "log.h" |
32 | |
33 | struct carpgroup { |
34 | TAILQ_ENTRY(carpgroup)struct { struct carpgroup *tqe_next; struct carpgroup **tqe_prev ; } entry; |
35 | char *group; |
36 | int do_demote; |
37 | int changed_by; |
38 | }; |
39 | |
40 | TAILQ_HEAD(carpgroups, carpgroup)struct carpgroups { struct carpgroup *tqh_first; struct carpgroup **tqh_last; } carpgroups = |
41 | TAILQ_HEAD_INITIALIZER(carpgroups){ ((void *)0), &(carpgroups).tqh_first }; |
42 | |
43 | struct carpgroup *carp_group_find(char *group); |
44 | int carp_demote_ioctl(char *, int); |
45 | |
46 | struct carpgroup * |
47 | carp_group_find(char *group) |
48 | { |
49 | struct carpgroup *c; |
50 | |
51 | TAILQ_FOREACH(c, &carpgroups, entry)for((c) = ((&carpgroups)->tqh_first); (c) != ((void *) 0); (c) = ((c)->entry.tqe_next)) |
52 | if (!strcmp(c->group, group)) |
53 | return (c); |
54 | |
55 | return (NULL((void *)0)); |
56 | } |
57 | |
58 | int |
59 | carp_demote_init(char *group, int force) |
60 | { |
61 | struct carpgroup *c; |
62 | int level; |
63 | |
64 | if ((c = carp_group_find(group)) == NULL((void *)0)) { |
Although the value stored to 'c' is used in the enclosing expression, the value is never actually read from 'c' | |
65 | if ((c = calloc(1, sizeof(struct carpgroup))) == NULL((void *)0)) { |
66 | log_warn("carp_demote_init calloc"); |
67 | return (-1); |
68 | } |
69 | if ((c->group = strdup(group)) == NULL((void *)0)) { |
70 | log_warn("carp_demote_init strdup"); |
71 | free(c); |
72 | return (-1); |
73 | } |
74 | |
75 | /* only demote if this group already is demoted */ |
76 | if ((level = carp_demote_get(group)) == -1) { |
77 | free(c->group); |
78 | free(c); |
79 | return (-1); |
80 | } |
81 | if (level > 0 || force) |
82 | c->do_demote = 1; |
83 | |
84 | TAILQ_INSERT_TAIL(&carpgroups, c, entry)do { (c)->entry.tqe_next = ((void *)0); (c)->entry.tqe_prev = (&carpgroups)->tqh_last; *(&carpgroups)->tqh_last = (c); (&carpgroups)->tqh_last = &(c)->entry.tqe_next ; } while (0); |
85 | } |
86 | |
87 | return (0); |
88 | } |
89 | |
90 | void |
91 | carp_demote_shutdown(void) |
92 | { |
93 | struct carpgroup *c; |
94 | |
95 | while ((c = TAILQ_FIRST(&carpgroups)((&carpgroups)->tqh_first)) != NULL((void *)0)) { |
96 | TAILQ_REMOVE(&carpgroups, c, entry)do { if (((c)->entry.tqe_next) != ((void *)0)) (c)->entry .tqe_next->entry.tqe_prev = (c)->entry.tqe_prev; else ( &carpgroups)->tqh_last = (c)->entry.tqe_prev; *(c)-> entry.tqe_prev = (c)->entry.tqe_next; ; ; } while (0); |
97 | if (c->do_demote && c->changed_by > 0) |
98 | carp_demote_ioctl(c->group, -c->changed_by); |
99 | |
100 | free(c->group); |
101 | free(c); |
102 | } |
103 | } |
104 | |
105 | int |
106 | carp_demote_get(char *group) |
107 | { |
108 | int s; |
109 | struct ifgroupreq ifgr; |
110 | |
111 | if ((s = socket(AF_INET2, SOCK_DGRAM2 | SOCK_CLOEXEC0x8000, 0)) == -1) { |
112 | log_warn("carp_demote_get: socket"); |
113 | return (-1); |
114 | } |
115 | |
116 | memset(&ifgr, 0, sizeof(ifgr)); |
117 | strlcpy(ifgr.ifgr_name, group, sizeof(ifgr.ifgr_name)); |
118 | |
119 | if (ioctl(s, SIOCGIFGATTR(((unsigned long)0x80000000|(unsigned long)0x40000000) | ((sizeof (struct ifgroupreq) & 0x1fff) << 16) | ((('i')) << 8) | ((139))), (caddr_t)&ifgr) == -1) { |
120 | if (errno(*__errno()) == ENOENT2) |
121 | log_warnx("group \"%s\" does not exist", group); |
122 | else |
123 | log_warn("carp_demote_get: ioctl"); |
124 | close(s); |
125 | return (-1); |
126 | } |
127 | |
128 | close(s); |
129 | return ((int)ifgr.ifgr_attribifgr_ifgru.ifgru_attrib.ifg_carp_demoted); |
130 | } |
131 | |
132 | int |
133 | carp_demote_set(char *group, int demote) |
134 | { |
135 | struct carpgroup *c; |
136 | |
137 | if ((c = carp_group_find(group)) == NULL((void *)0)) { |
138 | log_warnx("carp_group_find for %s returned NULL?!", group); |
139 | return (-1); |
140 | } |
141 | |
142 | if (c->changed_by + demote < 0) { |
143 | log_warnx("carp_demote_set: changed_by + demote < 0"); |
144 | return (-1); |
145 | } |
146 | |
147 | if (c->do_demote && carp_demote_ioctl(group, demote) == -1) |
148 | return (-1); |
149 | |
150 | c->changed_by += demote; |
151 | |
152 | /* enable demotion when we return to 0, i. e. all sessions up */ |
153 | if (demote < 0 && c->changed_by == 0) |
154 | c->do_demote = 1; |
155 | |
156 | return (0); |
157 | } |
158 | |
159 | int |
160 | carp_demote_ioctl(char *group, int demote) |
161 | { |
162 | int s, res; |
163 | struct ifgroupreq ifgr; |
164 | |
165 | if ((s = socket(AF_INET2, SOCK_DGRAM2 | SOCK_CLOEXEC0x8000, 0)) == -1) { |
166 | log_warn("%s: socket", __func__); |
167 | return (-1); |
168 | } |
169 | |
170 | memset(&ifgr, 0, sizeof(ifgr)); |
171 | strlcpy(ifgr.ifgr_name, group, sizeof(ifgr.ifgr_name)); |
172 | ifgr.ifgr_attribifgr_ifgru.ifgru_attrib.ifg_carp_demoted = demote; |
173 | |
174 | if ((res = ioctl(s, SIOCSIFGATTR((unsigned long)0x80000000 | ((sizeof(struct ifgroupreq) & 0x1fff) << 16) | ((('i')) << 8) | ((140))), (caddr_t)&ifgr)) == -1) |
175 | log_warn("unable to %s the demote state " |
176 | "of group '%s'", (demote > 0) ? "increment" : "decrement", |
177 | group); |
178 | else |
179 | log_info("%s the demote state of group '%s'", |
180 | (demote > 0) ? "incremented" : "decremented", group); |
181 | |
182 | close(s); |
183 | return (res); |
184 | } |