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/*
* BIRD Internet Routing Daemon -- Linux Multicasting and Network Includes
*
* (c) 1998--2000 Martin Mares <mj@ucw.cz>
*
* Can be freely distributed and used under the terms of the GNU GPL.
*/
#ifdef IPV6
#ifndef IPV6_UNICAST_HOPS
/* Needed on glibc 2.0 systems */
#include <linux/in6.h>
#define CONFIG_IPV6_GLIBC_20
#endif
static inline void
set_inaddr(struct in6_addr *ia, ip_addr a)
{
ipa_hton(a);
memcpy(ia, &a, sizeof(a));
}
#else
#include <net/if.h>
static inline void
set_inaddr(struct in_addr *ia, ip_addr a)
{
ipa_hton(a);
memcpy(&ia->s_addr, &a, sizeof(a));
}
/*
* Multicasting in Linux systems is a real mess. Not only different kernels
* have different interfaces, but also different libc's export it in different
* ways. Horrible.
*/
#if defined(CONFIG_LINUX_MC_MREQ) || defined(CONFIG_LINUX_MC_MREQ_BIND)
/*
* Older kernels support only struct mreq which matches interfaces by their
* addresses and thus fails on unnumbered devices. On newer 2.0 kernels
* we can use SO_BINDTODEVICE to circumvent this problem.
*/
#define MREQ_IFA struct in_addr
#define MREQ_GRP struct ip_mreq
static inline void fill_mreq_ifa(struct in_addr *m, struct iface *ifa, UNUSED ip_addr maddr)
{
set_inaddr(m, ifa->addr->ip);
}
static inline void fill_mreq_grp(struct ip_mreq *m, struct iface *ifa, ip_addr maddr)
{
bzero(m, sizeof(*m));
#ifdef CONFIG_LINUX_MC_MREQ_BIND
m->imr_interface.s_addr = INADDR_ANY;
#else
set_inaddr(&m->imr_interface, ifa->addr->ip);
#endif
set_inaddr(&m->imr_multiaddr, maddr);
}
#endif
#ifdef CONFIG_LINUX_MC_MREQN
/*
* 2.1 and newer kernels use struct mreqn which passes ifindex, so no
* problems with unnumbered devices.
*/
#ifndef HAVE_STRUCT_IP_MREQN
/* Several versions of glibc don't define this structure, so we have to do it ourselves */
struct ip_mreqn
{
struct in_addr imr_multiaddr; /* IP multicast address of group */
struct in_addr imr_address; /* local IP address of interface */
int imr_ifindex; /* Interface index */
};
#endif
#define MREQ_IFA struct ip_mreqn
#define MREQ_GRP struct ip_mreqn
#define fill_mreq_ifa fill_mreq
#define fill_mreq_grp fill_mreq
static inline void fill_mreq(struct ip_mreqn *m, struct iface *ifa, ip_addr maddr)
{
bzero(m, sizeof(*m));
m->imr_ifindex = ifa->index;
set_inaddr(&m->imr_address, ifa->addr->ip);
set_inaddr(&m->imr_multiaddr, maddr);
}
#endif
static inline char *
sysio_setup_multicast(sock *s)
{
MREQ_IFA m;
int zero = 0;
if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_LOOP, &zero, sizeof(zero)) < 0)
return "IP_MULTICAST_LOOP";
if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_TTL, &s->ttl, sizeof(s->ttl)) < 0)
return "IP_MULTICAST_TTL";
/* This defines where should we send _outgoing_ multicasts */
fill_mreq_ifa(&m, s->iface, IPA_NONE);
if (setsockopt(s->fd, SOL_IP, IP_MULTICAST_IF, &m, sizeof(m)) < 0)
return "IP_MULTICAST_IF";
#if defined(CONFIG_LINUX_MC_MREQ_BIND) || defined(CONFIG_LINUX_MC_MREQN)
{
struct ifreq ifr;
strcpy(ifr.ifr_name, s->iface->name);
if (setsockopt(s->fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0)
return "SO_BINDTODEVICE";
}
#endif
return NULL;
}
static inline char *
sysio_join_group(sock *s, ip_addr maddr)
{
MREQ_GRP m;
/* And this one sets interface for _receiving_ multicasts from */
fill_mreq_grp(&m, s->iface, maddr);
if (setsockopt(s->fd, SOL_IP, IP_ADD_MEMBERSHIP, &m, sizeof(m)) < 0)
return "IP_ADD_MEMBERSHIP";
return NULL;
}
static inline char *
sysio_leave_group(sock *s, ip_addr maddr)
{
MREQ_GRP m;
/* And this one sets interface for _receiving_ multicasts from */
fill_mreq_grp(&m, s->iface, maddr);
if (setsockopt(s->fd, SOL_IP, IP_DROP_MEMBERSHIP, &m, sizeof(m)) < 0)
return "IP_DROP_MEMBERSHIP";
return NULL;
}
#endif
#include <linux/socket.h>
#include <linux/tcp.h>
/* For the case that we have older kernel headers */
/* Copied from Linux kernel file include/linux/tcp.h */
#ifndef TCP_MD5SIG
#define TCP_MD5SIG 14
#define TCP_MD5SIG_MAXKEYLEN 80
struct tcp_md5sig {
struct sockaddr_storage tcpm_addr; /* address associated */
__u16 __tcpm_pad1; /* zero */
__u16 tcpm_keylen; /* key length */
__u32 __tcpm_pad2; /* zero */
__u8 tcpm_key[TCP_MD5SIG_MAXKEYLEN]; /* key (binary) */
};
#endif
static int
sk_set_md5_auth_int(sock *s, sockaddr *sa, char *passwd)
{
struct tcp_md5sig md5;
memset(&md5, 0, sizeof(md5));
memcpy(&md5.tcpm_addr, (struct sockaddr *) sa, sizeof(*sa));
if (passwd)
{
int len = strlen(passwd);
if (len > TCP_MD5SIG_MAXKEYLEN)
{
log(L_ERR "MD5 password too long");
return -1;
}
md5.tcpm_keylen = len;
memcpy(&md5.tcpm_key, passwd, len);
}
int rv = setsockopt(s->fd, IPPROTO_TCP, TCP_MD5SIG, &md5, sizeof(md5));
if (rv < 0)
{
if (errno == ENOPROTOOPT)
log(L_ERR "Kernel does not support TCP MD5 signatures");
else
log(L_ERR "sk_set_md5_auth_int: setsockopt: %m");
}
return rv;
}
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