From f9c799a00e705b1420b214628c2bb2a30bf491d9 Mon Sep 17 00:00:00 2001 From: Ondrej Zajicek Date: Fri, 4 Sep 2009 11:06:51 +0200 Subject: Temporary OSPFv3 development commit (changing multicast support). --- sysdep/linux/sysio.h | 136 ++++++++++++++++++++++++++++----------------------- 1 file changed, 75 insertions(+), 61 deletions(-) (limited to 'sysdep/linux/sysio.h') diff --git a/sysdep/linux/sysio.h b/sysdep/linux/sysio.h index 2fa5f0a..70d35cc 100644 --- a/sysdep/linux/sysio.h +++ b/sysdep/linux/sysio.h @@ -38,27 +38,33 @@ set_inaddr(struct in_addr *ia, ip_addr a) * ways. Horrible. */ -static inline char *sysio_mcast_setup(sock *s) + +#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) { - int zero = 0; + set_inaddr(m, ifa->addr->ip); +} - if (ipa_nonzero(s->daddr)) - { - if ( -#ifdef IP_DEFAULT_MULTICAST_TTL - s->ttl != IP_DEFAULT_MULTICAST_TTL && -#endif - setsockopt(s->fd, SOL_IP, IP_MULTICAST_TTL, &s->ttl, sizeof(s->ttl)) < 0) - return "IP_MULTICAST_TTL"; - if ( -#ifdef IP_DEFAULT_MULTICAST_LOOP - IP_DEFAULT_MULTICAST_LOOP && +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 - setsockopt(s->fd, SOL_IP, IP_MULTICAST_LOOP, &zero, sizeof(zero)) < 0) - return "IP_MULTICAST_LOOP"; - } - return NULL; + set_inaddr(&m->imr_multiaddr, maddr); } +#endif + #ifdef CONFIG_LINUX_MC_MREQN /* @@ -76,70 +82,78 @@ struct ip_mreqn }; #endif -static inline char *sysio_mcast_join(sock *s) +#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 fill_mreq(struct ip_mreqn *m, struct iface *ifa, ip_addr maddr) { - struct ip_mreqn mreq; - char *err; - struct ifreq ifr; - - if (err = sysio_mcast_setup(s)) - return err; - strcpy(ifr.ifr_name, s->iface->name); - if (setsockopt(s->fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr)) < 0) - return "SO_BINDTODEVICE"; - mreq.imr_ifindex = s->iface->index; - set_inaddr(&mreq.imr_address, s->iface->addr->ip); - set_inaddr(&mreq.imr_multiaddr, s->daddr); - /* This defines where should we send _outgoing_ multicasts */ - if (ipa_nonzero(s->daddr) && setsockopt(s->fd, SOL_IP, IP_MULTICAST_IF, &mreq, sizeof(mreq)) < 0) - return "IP_MULTICAST_IF"; - /* And this one sets interface for _receiving_ multicasts from */ - if (ipa_nonzero(s->saddr) && setsockopt(s->fd, SOL_IP, IP_ADD_MEMBERSHIP, &mreq, sizeof(mreq)) < 0) - return "IP_ADD_MEMBERSHIP"; - return NULL; + bzero(m, sizeof(*m)); + m->imr_ifindex = ifa->index; + set_inaddr(&m->imr_address, ifa->addr->ip); + set_inaddr(&m->imr_multiaddr, maddr); } #endif -#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. - */ - -static inline char *sysio_mcast_join(sock *s) +static inline char * +sysio_setup_multicast(sock *s) { - struct in_addr mreq; - struct ip_mreq mreq_add; - char *err; + MREQ_IFA m; + int zero = 0; - if (err = sysio_mcast_setup(s)) - return err; - set_inaddr(&mreq, s->iface->addr->ip); -#ifdef CONFIG_LINUX_MC_MREQ_BIND + 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"; - mreq_add.imr_interface.s_addr = INADDR_ANY; } -#else - mreq_add.imr_interface = mreq; #endif - set_inaddr(&mreq_add.imr_multiaddr, s->daddr); - /* This defines where should we send _outgoing_ multicasts */ - if (ipa_nonzero(s->daddr) && setsockopt(s->fd, SOL_IP, IP_MULTICAST_IF, &mreq, sizeof(mreq)) < 0) - return "IP_MULTICAST_IF"; + + 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 */ - if (ipa_nonzero(s->saddr) && setsockopt(s->fd, SOL_IP, IP_ADD_MEMBERSHIP, &mreq_add, sizeof(mreq_add)) < 0) + 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 #endif + #include #include -- cgit v1.2.3