Annotation of embedaddon/freevrrpd/vrrp_multicast.c, revision 1.1.1.1
1.1 misho 1: /*
2: * Copyright (c) 2001,2002 Sebastien Petit <spe@bsdfr.org>
3: *
4: * Redistribution and use in source forms, with and without modification,
5: * are permitted provided that the following conditions are met:
6: * 1. Redistributions of source code must retain the above copyright notice,
7: * this list of conditions and the following disclaimer.
8: * 2. Redistributions in binary form must reproduce the above copyright notice,
9: * this list of conditions and the following disclaimer in the documentation
10: * and/or other materials provided with the distribution. Obviously, it
11: * would be nice if you gave credit where credit is due but requiring it
12: * would be too onerous.
13: * 3. All advertising materials mentioning features or use of this software
14: * must display the following acknowledgement:
15: * This product includes software developed by Sebastien Petit.
16: * 4. Neither the name of its contributors may be used to endorse or promote
17: * products derived from this software without specific prior written
18: * permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: *
32: * $Id: vrrp_multicast.c,v 1.7 2004/04/01 15:40:52 spe Exp $
33: */
34:
35: #include <errno.h>
36: #include "vrrp_multicast.h"
37:
38: /* join multicast group with ip address */
39: char
40: vrrp_multicast_join_group(int sd, u_char * multicast_ip, struct in_addr * interface_ip)
41: {
42: struct ip_mreq imr;
43:
44: bzero(&imr, sizeof(imr));
45: imr.imr_multiaddr.s_addr = inet_addr(multicast_ip);
46: imr.imr_interface.s_addr = interface_ip->s_addr;
47: if (setsockopt(sd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &imr, sizeof(imr)) == -1) {
48: syslog(LOG_ERR, "cannot join multicast group %s with ip source %s [ IP_ADD_MEMBERSHIP ]", multicast_ip, inet_ntoa(*interface_ip));
49: return -1;
50: }
51: return 0;
52: }
53:
54: /* Set multicast ttl IP */
55: char
56: vrrp_multicast_set_ttl(int sd, u_char ttl)
57: {
58: if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) == -1) {
59: syslog(LOG_ERR, "cannot set multicast TTL: %s", strerror(errno));
60: return -1;
61: }
62: return 0;
63: }
64:
65: char
66: vrrp_multicast_set_if(int sd, struct in_addr * addr, char *if_name)
67: {
68: if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_IF, addr, sizeof(*addr)) == -1) {
69: syslog(LOG_ERR, "cannot setsockopt IP_MULTICAST_IF on primary address of %s: %s", if_name, strerror(errno));
70: return -1;
71: }
72: return 0;
73: }
74:
75: int vrrp_multicast_set_loopback(int sd, u_char flag) {
76: if (setsockopt(sd, IPPROTO_IP, IP_MULTICAST_LOOP, &flag, sizeof(flag)) == -1) {
77: syslog(LOG_ERR, "cannot setsockopt IP_MULTICAST_LOOP: %s", strerror(errno));
78: return -1;
79: }
80:
81: return 0;
82: }
83:
84: /* Open VRRP socket and join multicast group */
85: char
86: vrrp_multicast_set_socket(struct vrrp_vr * vr)
87: {
88: if (vrrp_multicast_join_group(vr->sd, VRRP_MULTICAST_IP, (struct in_addr *) & vr->vr_if->ip_addrs[0]) == -1) {
89: close(vr->sd);
90: return -1;
91: }
92: if (vrrp_multicast_set_ttl(vr->sd, VRRP_MULTICAST_TTL) == -1) {
93: close(vr->sd);
94: return -1;
95: }
96: /* XXX don't need to force interface for multicast. Let the kernel
97: * choose by itself. this setsockopt doesn't work with ipsec/ah...
98: * don't know why */
99: if (vrrp_multicast_set_if(vr->sd, &vr->vr_if->ip_addrs[0], vr->vr_if->if_name) == -1) {
100: close(vr->sd);
101: return -1;
102: }
103: if (vrrp_multicast_set_loopback(vr->sd, VRRP_MULTICAST_DISABLE_LOOPBACK) == -1) {
104: close(vr->sd);
105: return -1;
106: }
107:
108: return 0;
109: }
110:
111: char
112: vrrp_multicast_open_socket(struct vrrp_vr * vr)
113: {
114: if (vrrp_network_open_socket(vr) == -1)
115: return -1;
116: if (vrrp_multicast_set_socket(vr) == -1)
117: return -1;
118:
119: return 0;
120: }
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