diff options
Diffstat (limited to 'net/ipv6/mcast.c')
| -rw-r--r-- | net/ipv6/mcast.c | 2499 |
1 files changed, 2499 insertions, 0 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c new file mode 100644 index 0000000..393b6e6 --- /dev/null +++ b/net/ipv6/mcast.c @@ -0,0 +1,2499 @@ +/* + * Multicast support for IPv6 + * Linux INET6 implementation + * + * Authors: + * Pedro Roque <roque@di.fc.ul.pt> + * + * $Id: mcast.c,v 1.40 2002/02/08 03:57:19 davem Exp $ + * + * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version + * 2 of the License, or (at your option) any later version. + */ + +/* Changes: + * + * yoshfuji : fix format of router-alert option + * YOSHIFUJI Hideaki @USAGI: + * Fixed source address for MLD message based on + * <draft-ietf-magma-mld-source-05.txt>. + * YOSHIFUJI Hideaki @USAGI: + * - Ignore Queries for invalid addresses. + * - MLD for link-local addresses. + * David L Stevens <dlstevens@us.ibm.com>: + * - MLDv2 support + */ + +#include <linux/config.h> +#include <linux/module.h> +#include <linux/errno.h> +#include <linux/types.h> +#include <linux/string.h> +#include <linux/socket.h> +#include <linux/sockios.h> +#include <linux/jiffies.h> +#include <linux/times.h> +#include <linux/net.h> +#include <linux/in.h> +#include <linux/in6.h> +#include <linux/netdevice.h> +#include <linux/if_arp.h> +#include <linux/route.h> +#include <linux/init.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> + +#include <linux/netfilter.h> +#include <linux/netfilter_ipv6.h> + +#include <net/sock.h> +#include <net/snmp.h> + +#include <net/ipv6.h> +#include <net/protocol.h> +#include <net/if_inet6.h> +#include <net/ndisc.h> +#include <net/addrconf.h> +#include <net/ip6_route.h> + +#include <net/ip6_checksum.h> + +/* Set to 3 to get tracing... */ +#define MCAST_DEBUG 2 + +#if MCAST_DEBUG >= 3 +#define MDBG(x) printk x +#else +#define MDBG(x) +#endif + +/* + * These header formats should be in a separate include file, but icmpv6.h + * doesn't have in6_addr defined in all cases, there is no __u128, and no + * other files reference these. + * + * +-DLS 4/14/03 + */ + +/* Multicast Listener Discovery version 2 headers */ + +struct mld2_grec { + __u8 grec_type; + __u8 grec_auxwords; + __u16 grec_nsrcs; + struct in6_addr grec_mca; + struct in6_addr grec_src[0]; +}; + +struct mld2_report { + __u8 type; + __u8 resv1; + __u16 csum; + __u16 resv2; + __u16 ngrec; + struct mld2_grec grec[0]; +}; + +struct mld2_query { + __u8 type; + __u8 code; + __u16 csum; + __u16 mrc; + __u16 resv1; + struct in6_addr mca; +#if defined(__LITTLE_ENDIAN_BITFIELD) + __u8 qrv:3, + suppress:1, + resv2:4; +#elif defined(__BIG_ENDIAN_BITFIELD) + __u8 resv2:4, + suppress:1, + qrv:3; +#else +#error "Please fix <asm/byteorder.h>" +#endif + __u8 qqic; + __u16 nsrcs; + struct in6_addr srcs[0]; +}; + +static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; + +/* Big mc list lock for all the sockets */ +static DEFINE_RWLOCK(ipv6_sk_mc_lock); + +static struct socket *igmp6_socket; + +int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr); + +static void igmp6_join_group(struct ifmcaddr6 *ma); +static void igmp6_leave_group(struct ifmcaddr6 *ma); +static void igmp6_timer_handler(unsigned long data); + +static void mld_gq_timer_expire(unsigned long data); +static void mld_ifc_timer_expire(unsigned long data); +static void mld_ifc_event(struct inet6_dev *idev); +static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *pmc); +static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *addr); +static void mld_clear_delrec(struct inet6_dev *idev); +static int sf_setstate(struct ifmcaddr6 *pmc); +static void sf_markstate(struct ifmcaddr6 *pmc); +static void ip6_mc_clear_src(struct ifmcaddr6 *pmc); +static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, + int sfmode, int sfcount, struct in6_addr *psfsrc, + int delta); +static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, + int sfmode, int sfcount, struct in6_addr *psfsrc, + int delta); +static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, + struct inet6_dev *idev); + + +#define IGMP6_UNSOLICITED_IVAL (10*HZ) +#define MLD_QRV_DEFAULT 2 + +#define MLD_V1_SEEN(idev) (ipv6_devconf.force_mld_version == 1 || \ + (idev)->cnf.force_mld_version == 1 || \ + ((idev)->mc_v1_seen && \ + time_before(jiffies, (idev)->mc_v1_seen))) + +#define MLDV2_MASK(value, nb) ((nb)>=32 ? (value) : ((1<<(nb))-1) & (value)) +#define MLDV2_EXP(thresh, nbmant, nbexp, value) \ + ((value) < (thresh) ? (value) : \ + ((MLDV2_MASK(value, nbmant) | (1<<(nbmant+nbexp))) << \ + (MLDV2_MASK((value) >> (nbmant), nbexp) + (nbexp)))) + +#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value) +#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value) + +#define IPV6_MLD_MAX_MSF 10 + +int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF; + +/* + * socket join on multicast group + */ + +int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr) +{ + struct net_device *dev = NULL; + struct ipv6_mc_socklist *mc_lst; + struct ipv6_pinfo *np = inet6_sk(sk); + int err; + + if (!ipv6_addr_is_multicast(addr)) + return -EINVAL; + + mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); + + if (mc_lst == NULL) + return -ENOMEM; + + mc_lst->next = NULL; + ipv6_addr_copy(&mc_lst->addr, addr); + + if (ifindex == 0) { + struct rt6_info *rt; + rt = rt6_lookup(addr, NULL, 0, 0); + if (rt) { + dev = rt->rt6i_dev; + dev_hold(dev); + dst_release(&rt->u.dst); + } + } else + dev = dev_get_by_index(ifindex); + + if (dev == NULL) { + sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); + return -ENODEV; + } + + mc_lst->ifindex = dev->ifindex; + mc_lst->sfmode = MCAST_EXCLUDE; + mc_lst->sflist = NULL; + + /* + * now add/increase the group membership on the device + */ + + err = ipv6_dev_mc_inc(dev, addr); + + if (err) { + sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); + dev_put(dev); + return err; + } + + write_lock_bh(&ipv6_sk_mc_lock); + mc_lst->next = np->ipv6_mc_list; + np->ipv6_mc_list = mc_lst; + write_unlock_bh(&ipv6_sk_mc_lock); + + dev_put(dev); + + return 0; +} + +/* + * socket leave on multicast group + */ +int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_mc_socklist *mc_lst, **lnk; + + write_lock_bh(&ipv6_sk_mc_lock); + for (lnk = &np->ipv6_mc_list; (mc_lst = *lnk) !=NULL ; lnk = &mc_lst->next) { + if ((ifindex == 0 || mc_lst->ifindex == ifindex) && + ipv6_addr_equal(&mc_lst->addr, addr)) { + struct net_device *dev; + + *lnk = mc_lst->next; + write_unlock_bh(&ipv6_sk_mc_lock); + + if ((dev = dev_get_by_index(mc_lst->ifindex)) != NULL) { + struct inet6_dev *idev = in6_dev_get(dev); + + if (idev) { + (void) ip6_mc_leave_src(sk,mc_lst,idev); + __ipv6_dev_mc_dec(idev, &mc_lst->addr); + in6_dev_put(idev); + } + dev_put(dev); + } + sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); + return 0; + } + } + write_unlock_bh(&ipv6_sk_mc_lock); + + return -ENOENT; +} + +static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex) +{ + struct net_device *dev = NULL; + struct inet6_dev *idev = NULL; + + if (ifindex == 0) { + struct rt6_info *rt; + + rt = rt6_lookup(group, NULL, 0, 0); + if (rt) { + dev = rt->rt6i_dev; + dev_hold(dev); + dst_release(&rt->u.dst); + } + } else + dev = dev_get_by_index(ifindex); + + if (!dev) + return NULL; + idev = in6_dev_get(dev); + if (!idev) { + dev_put(dev); + return NULL; + } + read_lock_bh(&idev->lock); + if (idev->dead) { + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + dev_put(dev); + return NULL; + } + return idev; +} + +void ipv6_sock_mc_close(struct sock *sk) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_mc_socklist *mc_lst; + + write_lock_bh(&ipv6_sk_mc_lock); + while ((mc_lst = np->ipv6_mc_list) != NULL) { + struct net_device *dev; + + np->ipv6_mc_list = mc_lst->next; + write_unlock_bh(&ipv6_sk_mc_lock); + + dev = dev_get_by_index(mc_lst->ifindex); + if (dev) { + struct inet6_dev *idev = in6_dev_get(dev); + + if (idev) { + (void) ip6_mc_leave_src(sk, mc_lst, idev); + __ipv6_dev_mc_dec(idev, &mc_lst->addr); + in6_dev_put(idev); + } + dev_put(dev); + } + + sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); + + write_lock_bh(&ipv6_sk_mc_lock); + } + write_unlock_bh(&ipv6_sk_mc_lock); +} + +int ip6_mc_source(int add, int omode, struct sock *sk, + struct group_source_req *pgsr) +{ + struct in6_addr *source, *group; + struct ipv6_mc_socklist *pmc; + struct net_device *dev; + struct inet6_dev *idev; + struct ipv6_pinfo *inet6 = inet6_sk(sk); + struct ip6_sf_socklist *psl; + int i, j, rv; + int err; + + if (pgsr->gsr_group.ss_family != AF_INET6 || + pgsr->gsr_source.ss_family != AF_INET6) + return -EINVAL; + + source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr; + group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr; + + if (!ipv6_addr_is_multicast(group)) + return -EINVAL; + + idev = ip6_mc_find_dev(group, pgsr->gsr_interface); + if (!idev) + return -ENODEV; + dev = idev->dev; + + err = -EADDRNOTAVAIL; + + for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { + if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface) + continue; + if (ipv6_addr_equal(&pmc->addr, group)) + break; + } + if (!pmc) /* must have a prior join */ + goto done; + /* if a source filter was set, must be the same mode as before */ + if (pmc->sflist) { + if (pmc->sfmode != omode) + goto done; + } else if (pmc->sfmode != omode) { + /* allow mode switches for empty-set filters */ + ip6_mc_add_src(idev, group, omode, 0, NULL, 0); + ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); + pmc->sfmode = omode; + } + + psl = pmc->sflist; + if (!add) { + if (!psl) + goto done; + rv = !0; + for (i=0; i<psl->sl_count; i++) { + rv = memcmp(&psl->sl_addr[i], source, + sizeof(struct in6_addr)); + if (rv == 0) + break; + } + if (rv) /* source not found */ + goto done; + + /* update the interface filter */ + ip6_mc_del_src(idev, group, omode, 1, source, 1); + + for (j=i+1; j<psl->sl_count; j++) + psl->sl_addr[j-1] = psl->sl_addr[j]; + psl->sl_count--; + err = 0; + goto done; + } + /* else, add a new source to the filter */ + + if (psl && psl->sl_count >= sysctl_mld_max_msf) { + err = -ENOBUFS; + goto done; + } + if (!psl || psl->sl_count == psl->sl_max) { + struct ip6_sf_socklist *newpsl; + int count = IP6_SFBLOCK; + + if (psl) + count += psl->sl_max; + newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, + IP6_SFLSIZE(count), GFP_ATOMIC); + if (!newpsl) { + err = -ENOBUFS; + goto done; + } + newpsl->sl_max = count; + newpsl->sl_count = count - IP6_SFBLOCK; + if (psl) { + for (i=0; i<psl->sl_count; i++) + newpsl->sl_addr[i] = psl->sl_addr[i]; + sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); + } + pmc->sflist = psl = newpsl; + } + rv = 1; /* > 0 for insert logic below if sl_count is 0 */ + for (i=0; i<psl->sl_count; i++) { + rv = memcmp(&psl->sl_addr[i], source, sizeof(struct in6_addr)); + if (rv == 0) + break; + } + if (rv == 0) /* address already there is an error */ + goto done; + for (j=psl->sl_count-1; j>=i; j--) + psl->sl_addr[j+1] = psl->sl_addr[j]; + psl->sl_addr[i] = *source; + psl->sl_count++; + err = 0; + /* update the interface list */ + ip6_mc_add_src(idev, group, omode, 1, source, 1); +done: + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + dev_put(dev); + return err; +} + +int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) +{ + struct in6_addr *group; + struct ipv6_mc_socklist *pmc; + struct net_device *dev; + struct inet6_dev *idev; + struct ipv6_pinfo *inet6 = inet6_sk(sk); + struct ip6_sf_socklist *newpsl, *psl; + int i, err; + + group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; + + if (!ipv6_addr_is_multicast(group)) + return -EINVAL; + if (gsf->gf_fmode != MCAST_INCLUDE && + gsf->gf_fmode != MCAST_EXCLUDE) + return -EINVAL; + + idev = ip6_mc_find_dev(group, gsf->gf_interface); + + if (!idev) + return -ENODEV; + dev = idev->dev; + err = -EADDRNOTAVAIL; + + for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { + if (pmc->ifindex != gsf->gf_interface) + continue; + if (ipv6_addr_equal(&pmc->addr, group)) + break; + } + if (!pmc) /* must have a prior join */ + goto done; + if (gsf->gf_numsrc) { + newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk, + IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC); + if (!newpsl) { + err = -ENOBUFS; + goto done; + } + newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc; + for (i=0; i<newpsl->sl_count; ++i) { + struct sockaddr_in6 *psin6; + + psin6 = (struct sockaddr_in6 *)&gsf->gf_slist[i]; + newpsl->sl_addr[i] = psin6->sin6_addr; + } + err = ip6_mc_add_src(idev, group, gsf->gf_fmode, + newpsl->sl_count, newpsl->sl_addr, 0); + if (err) { + sock_kfree_s(sk, newpsl, IP6_SFLSIZE(newpsl->sl_max)); + goto done; + } + } else + newpsl = NULL; + psl = pmc->sflist; + if (psl) { + (void) ip6_mc_del_src(idev, group, pmc->sfmode, + psl->sl_count, psl->sl_addr, 0); + sock_kfree_s(sk, psl, IP6_SFLSIZE(psl->sl_max)); + } else + (void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0); + pmc->sflist = newpsl; + pmc->sfmode = gsf->gf_fmode; +done: + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + dev_put(dev); + return err; +} + +int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf, + struct group_filter __user *optval, int __user *optlen) +{ + int err, i, count, copycount; + struct in6_addr *group; + struct ipv6_mc_socklist *pmc; + struct inet6_dev *idev; + struct net_device *dev; + struct ipv6_pinfo *inet6 = inet6_sk(sk); + struct ip6_sf_socklist *psl; + + group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; + + if (!ipv6_addr_is_multicast(group)) + return -EINVAL; + + idev = ip6_mc_find_dev(group, gsf->gf_interface); + + if (!idev) + return -ENODEV; + + dev = idev->dev; + + err = -EADDRNOTAVAIL; + + for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) { + if (pmc->ifindex != gsf->gf_interface) + continue; + if (ipv6_addr_equal(group, &pmc->addr)) + break; + } + if (!pmc) /* must have a prior join */ + goto done; + gsf->gf_fmode = pmc->sfmode; + psl = pmc->sflist; + count = psl ? psl->sl_count : 0; + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + dev_put(dev); + + copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc; + gsf->gf_numsrc = count; + if (put_user(GROUP_FILTER_SIZE(copycount), optlen) || + copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) { + return -EFAULT; + } + for (i=0; i<copycount; i++) { + struct sockaddr_in6 *psin6; + struct sockaddr_storage ss; + + psin6 = (struct sockaddr_in6 *)&ss; + memset(&ss, 0, sizeof(ss)); + psin6->sin6_family = AF_INET6; + psin6->sin6_addr = psl->sl_addr[i]; + if (copy_to_user(&optval->gf_slist[i], &ss, sizeof(ss))) + return -EFAULT; + } + return 0; +done: + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + dev_put(dev); + return err; +} + +int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr, + struct in6_addr *src_addr) +{ + struct ipv6_pinfo *np = inet6_sk(sk); + struct ipv6_mc_socklist *mc; + struct ip6_sf_socklist *psl; + int rv = 1; + + read_lock(&ipv6_sk_mc_lock); + for (mc = np->ipv6_mc_list; mc; mc = mc->next) { + if (ipv6_addr_equal(&mc->addr, mc_addr)) + break; + } + if (!mc) { + read_unlock(&ipv6_sk_mc_lock); + return 1; + } + psl = mc->sflist; + if (!psl) { + rv = mc->sfmode == MCAST_EXCLUDE; + } else { + int i; + + for (i=0; i<psl->sl_count; i++) { + if (ipv6_addr_equal(&psl->sl_addr[i], src_addr)) + break; + } + if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count) + rv = 0; + if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) + rv = 0; + } + read_unlock(&ipv6_sk_mc_lock); + + return rv; +} + +static void ma_put(struct ifmcaddr6 *mc) +{ + if (atomic_dec_and_test(&mc->mca_refcnt)) { + in6_dev_put(mc->idev); + kfree(mc); + } +} + +static void igmp6_group_added(struct ifmcaddr6 *mc) +{ + struct net_device *dev = mc->idev->dev; + char buf[MAX_ADDR_LEN]; + + spin_lock_bh(&mc->mca_lock); + if (!(mc->mca_flags&MAF_LOADED)) { + mc->mca_flags |= MAF_LOADED; + if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) + dev_mc_add(dev, buf, dev->addr_len, 0); + } + spin_unlock_bh(&mc->mca_lock); + + if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) + return; + + if (MLD_V1_SEEN(mc->idev)) { + igmp6_join_group(mc); + return; + } + /* else v2 */ + + mc->mca_crcount = mc->idev->mc_qrv; + mld_ifc_event(mc->idev); +} + +static void igmp6_group_dropped(struct ifmcaddr6 *mc) +{ + struct net_device *dev = mc->idev->dev; + char buf[MAX_ADDR_LEN]; + + spin_lock_bh(&mc->mca_lock); + if (mc->mca_flags&MAF_LOADED) { + mc->mca_flags &= ~MAF_LOADED; + if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0) + dev_mc_delete(dev, buf, dev->addr_len, 0); + } + + if (mc->mca_flags & MAF_NOREPORT) + goto done; + spin_unlock_bh(&mc->mca_lock); + + if (!mc->idev->dead) + igmp6_leave_group(mc); + + spin_lock_bh(&mc->mca_lock); + if (del_timer(&mc->mca_timer)) + atomic_dec(&mc->mca_refcnt); +done: + ip6_mc_clear_src(mc); + spin_unlock_bh(&mc->mca_lock); +} + +/* + * deleted ifmcaddr6 manipulation + */ +static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) +{ + struct ifmcaddr6 *pmc; + + /* this is an "ifmcaddr6" for convenience; only the fields below + * are actually used. In particular, the refcnt and users are not + * used for management of the delete list. Using the same structure + * for deleted items allows change reports to use common code with + * non-deleted or query-response MCA's. + */ + pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC); + if (!pmc) + return; + memset(pmc, 0, sizeof(*pmc)); + spin_lock_bh(&im->mca_lock); + spin_lock_init(&pmc->mca_lock); + pmc->idev = im->idev; + in6_dev_hold(idev); + pmc->mca_addr = im->mca_addr; + pmc->mca_crcount = idev->mc_qrv; + pmc->mca_sfmode = im->mca_sfmode; + if (pmc->mca_sfmode == MCAST_INCLUDE) { + struct ip6_sf_list *psf; + + pmc->mca_tomb = im->mca_tomb; + pmc->mca_sources = im->mca_sources; + im->mca_tomb = im->mca_sources = NULL; + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) + psf->sf_crcount = pmc->mca_crcount; + } + spin_unlock_bh(&im->mca_lock); + + write_lock_bh(&idev->mc_lock); + pmc->next = idev->mc_tomb; + idev->mc_tomb = pmc; + write_unlock_bh(&idev->mc_lock); +} + +static void mld_del_delrec(struct inet6_dev *idev, struct in6_addr *pmca) +{ + struct ifmcaddr6 *pmc, *pmc_prev; + struct ip6_sf_list *psf, *psf_next; + + write_lock_bh(&idev->mc_lock); + pmc_prev = NULL; + for (pmc=idev->mc_tomb; pmc; pmc=pmc->next) { + if (ipv6_addr_equal(&pmc->mca_addr, pmca)) + break; + pmc_prev = pmc; + } + if (pmc) { + if (pmc_prev) + pmc_prev->next = pmc->next; + else + idev->mc_tomb = pmc->next; + } + write_unlock_bh(&idev->mc_lock); + if (pmc) { + for (psf=pmc->mca_tomb; psf; psf=psf_next) { + psf_next = psf->sf_next; + kfree(psf); + } + in6_dev_put(pmc->idev); + kfree(pmc); + } +} + +static void mld_clear_delrec(struct inet6_dev *idev) +{ + struct ifmcaddr6 *pmc, *nextpmc; + + write_lock_bh(&idev->mc_lock); + pmc = idev->mc_tomb; + idev->mc_tomb = NULL; + write_unlock_bh(&idev->mc_lock); + + for (; pmc; pmc = nextpmc) { + nextpmc = pmc->next; + ip6_mc_clear_src(pmc); + in6_dev_put(pmc->idev); + kfree(pmc); + } + + /* clear dead sources, too */ + read_lock_bh(&idev->lock); + for (pmc=idev->mc_list; pmc; pmc=pmc->next) { + struct ip6_sf_list *psf, *psf_next; + + spin_lock_bh(&pmc->mca_lock); + psf = pmc->mca_tomb; + pmc->mca_tomb = NULL; + spin_unlock_bh(&pmc->mca_lock); + for (; psf; psf=psf_next) { + psf_next = psf->sf_next; + kfree(psf); + } + } + read_unlock_bh(&idev->lock); +} + + +/* + * device multicast group inc (add if not found) + */ +int ipv6_dev_mc_inc(struct net_device *dev, struct in6_addr *addr) +{ + struct ifmcaddr6 *mc; + struct inet6_dev *idev; + + idev = in6_dev_get(dev); + + if (idev == NULL) + return -EINVAL; + + write_lock_bh(&idev->lock); + if (idev->dead) { + write_unlock_bh(&idev->lock); + in6_dev_put(idev); + return -ENODEV; + } + + for (mc = idev->mc_list; mc; mc = mc->next) { + if (ipv6_addr_equal(&mc->mca_addr, addr)) { + mc->mca_users++; + write_unlock_bh(&idev->lock); + ip6_mc_add_src(idev, &mc->mca_addr, MCAST_EXCLUDE, 0, + NULL, 0); + in6_dev_put(idev); + return 0; + } + } + + /* + * not found: create a new one. + */ + + mc = kmalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); + + if (mc == NULL) { + write_unlock_bh(&idev->lock); + in6_dev_put(idev); + return -ENOMEM; + } + + memset(mc, 0, sizeof(struct ifmcaddr6)); + init_timer(&mc->mca_timer); + mc->mca_timer.function = igmp6_timer_handler; + mc->mca_timer.data = (unsigned long) mc; + + ipv6_addr_copy(&mc->mca_addr, addr); + mc->idev = idev; + mc->mca_users = 1; + /* mca_stamp should be updated upon changes */ + mc->mca_cstamp = mc->mca_tstamp = jiffies; + atomic_set(&mc->mca_refcnt, 2); + spin_lock_init(&mc->mca_lock); + + /* initial mode is (EX, empty) */ + mc->mca_sfmode = MCAST_EXCLUDE; + mc->mca_sfcount[MCAST_EXCLUDE] = 1; + + if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) || + IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) + mc->mca_flags |= MAF_NOREPORT; + + mc->next = idev->mc_list; + idev->mc_list = mc; + write_unlock_bh(&idev->lock); + + mld_del_delrec(idev, &mc->mca_addr); + igmp6_group_added(mc); + ma_put(mc); + return 0; +} + +/* + * device multicast group del + */ +int __ipv6_dev_mc_dec(struct inet6_dev *idev, struct in6_addr *addr) +{ + struct ifmcaddr6 *ma, **map; + + write_lock_bh(&idev->lock); + for (map = &idev->mc_list; (ma=*map) != NULL; map = &ma->next) { + if (ipv6_addr_equal(&ma->mca_addr, addr)) { + if (--ma->mca_users == 0) { + *map = ma->next; + write_unlock_bh(&idev->lock); + + igmp6_group_dropped(ma); + + ma_put(ma); + return 0; + } + write_unlock_bh(&idev->lock); + return 0; + } + } + write_unlock_bh(&idev->lock); + + return -ENOENT; +} + +int ipv6_dev_mc_dec(struct net_device *dev, struct in6_addr *addr) +{ + struct inet6_dev *idev = in6_dev_get(dev); + int err; + + if (!idev) + return -ENODEV; + + err = __ipv6_dev_mc_dec(idev, addr); + + in6_dev_put(idev); + + return err; +} + +/* + * identify MLD packets for MLD filter exceptions + */ +int ipv6_is_mld(struct sk_buff *skb, int nexthdr) +{ + struct icmp6hdr *pic; + + if (nexthdr != IPPROTO_ICMPV6) + return 0; + + if (!pskb_may_pull(skb, sizeof(struct icmp6hdr))) + return 0; + + pic = (struct icmp6hdr *)skb->h.raw; + + switch (pic->icmp6_type) { + case ICMPV6_MGM_QUERY: + case ICMPV6_MGM_REPORT: + case ICMPV6_MGM_REDUCTION: + case ICMPV6_MLD2_REPORT: + return 1; + default: + break; + } + return 0; +} + +/* + * check if the interface/address pair is valid + */ +int ipv6_chk_mcast_addr(struct net_device *dev, struct in6_addr *group, + struct in6_addr *src_addr) +{ + struct inet6_dev *idev; + struct ifmcaddr6 *mc; + int rv = 0; + + idev = in6_dev_get(dev); + if (idev) { + read_lock_bh(&idev->lock); + for (mc = idev->mc_list; mc; mc=mc->next) { + if (ipv6_addr_equal(&mc->mca_addr, group)) + break; + } + if (mc) { + if (src_addr && !ipv6_addr_any(src_addr)) { + struct ip6_sf_list *psf; + + spin_lock_bh(&mc->mca_lock); + for (psf=mc->mca_sources;psf;psf=psf->sf_next) { + if (ipv6_addr_equal(&psf->sf_addr, src_addr)) + break; + } + if (psf) + rv = psf->sf_count[MCAST_INCLUDE] || + psf->sf_count[MCAST_EXCLUDE] != + mc->mca_sfcount[MCAST_EXCLUDE]; + else + rv = mc->mca_sfcount[MCAST_EXCLUDE] !=0; + spin_unlock_bh(&mc->mca_lock); + } else + rv = 1; /* don't filter unspecified source */ + } + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + } + return rv; +} + +static void mld_gq_start_timer(struct inet6_dev *idev) +{ + int tv = net_random() % idev->mc_maxdelay; + + idev->mc_gq_running = 1; + if (!mod_timer(&idev->mc_gq_timer, jiffies+tv+2)) + in6_dev_hold(idev); +} + +static void mld_ifc_start_timer(struct inet6_dev *idev, int delay) +{ + int tv = net_random() % delay; + + if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) + in6_dev_hold(idev); +} + +/* + * IGMP handling (alias multicast ICMPv6 messages) + */ + +static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime) +{ + unsigned long delay = resptime; + + /* Do not start timer for these addresses */ + if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) || + IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL) + return; + + if (del_timer(&ma->mca_timer)) { + atomic_dec(&ma->mca_refcnt); + delay = ma->mca_timer.expires - jiffies; + } + + if (delay >= resptime) { + if (resptime) + delay = net_random() % resptime; + else + delay = 1; + } + ma->mca_timer.expires = jiffies + delay; + if (!mod_timer(&ma->mca_timer, jiffies + delay)) + atomic_inc(&ma->mca_refcnt); + ma->mca_flags |= MAF_TIMER_RUNNING; +} + +static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, + struct in6_addr *srcs) +{ + struct ip6_sf_list *psf; + int i, scount; + + scount = 0; + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { + if (scount == nsrcs) + break; + for (i=0; i<nsrcs; i++) + if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { + psf->sf_gsresp = 1; + scount++; + break; + } + } +} + +int igmp6_event_query(struct sk_buff *skb) +{ + struct mld2_query *mlh2 = (struct mld2_query *) skb->h.raw; + struct ifmcaddr6 *ma; + struct in6_addr *group; + unsigned long max_delay; + struct inet6_dev *idev; + struct icmp6hdr *hdr; + int group_type; + int mark = 0; + int len; + + if (!pskb_may_pull(skb, sizeof(struct in6_addr))) + return -EINVAL; + + /* compute payload length excluding extension headers */ + len = ntohs(skb->nh.ipv6h->payload_len) + sizeof(struct ipv6hdr); + len -= (char *)skb->h.raw - (char *)skb->nh.ipv6h; + + /* Drop queries with not link local source */ + if (!(ipv6_addr_type(&skb->nh.ipv6h->saddr)&IPV6_ADDR_LINKLOCAL)) + return -EINVAL; + + idev = in6_dev_get(skb->dev); + + if (idev == NULL) + return 0; + + hdr = (struct icmp6hdr *) skb->h.raw; + group = (struct in6_addr *) (hdr + 1); + group_type = ipv6_addr_type(group); + + if (group_type != IPV6_ADDR_ANY && + !(group_type&IPV6_ADDR_MULTICAST)) { + in6_dev_put(idev); + return -EINVAL; + } + + if (len == 24) { + int switchback; + /* MLDv1 router present */ + + /* Translate milliseconds to jiffies */ + max_delay = (ntohs(hdr->icmp6_maxdelay)*HZ)/1000; + + switchback = (idev->mc_qrv + 1) * max_delay; + idev->mc_v1_seen = jiffies + switchback; + + /* cancel the interface change timer */ + idev->mc_ifc_count = 0; + if (del_timer(&idev->mc_ifc_timer)) + __in6_dev_put(idev); + /* clear deleted report items */ + mld_clear_delrec(idev); + } else if (len >= 28) { + max_delay = (MLDV2_MRC(ntohs(mlh2->mrc))*HZ)/1000; + if (!max_delay) + max_delay = 1; + idev->mc_maxdelay = max_delay; + if (mlh2->qrv) + idev->mc_qrv = mlh2->qrv; + if (group_type == IPV6_ADDR_ANY) { /* general query */ + if (mlh2->nsrcs) { + in6_dev_put(idev); + return -EINVAL; /* no sources allowed */ + } + mld_gq_start_timer(idev); + in6_dev_put(idev); + return 0; + } + /* mark sources to include, if group & source-specific */ + mark = mlh2->nsrcs != 0; + } else { + in6_dev_put(idev); + return -EINVAL; + } + + read_lock_bh(&idev->lock); + if (group_type == IPV6_ADDR_ANY) { + for (ma = idev->mc_list; ma; ma=ma->next) { + spin_lock_bh(&ma->mca_lock); + igmp6_group_queried(ma, max_delay); + spin_unlock_bh(&ma->mca_lock); + } + } else { + for (ma = idev->mc_list; ma; ma=ma->next) { + if (group_type != IPV6_ADDR_ANY && + !ipv6_addr_equal(group, &ma->mca_addr)) + continue; + spin_lock_bh(&ma->mca_lock); + if (ma->mca_flags & MAF_TIMER_RUNNING) { + /* gsquery <- gsquery && mark */ + if (!mark) + ma->mca_flags &= ~MAF_GSQUERY; + } else { + /* gsquery <- mark */ + if (mark) + ma->mca_flags |= MAF_GSQUERY; + else + ma->mca_flags &= ~MAF_GSQUERY; + } + if (ma->mca_flags & MAF_GSQUERY) + mld_marksources(ma, ntohs(mlh2->nsrcs), + mlh2->srcs); + igmp6_group_queried(ma, max_delay); + spin_unlock_bh(&ma->mca_lock); + if (group_type != IPV6_ADDR_ANY) + break; + } + } + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + + return 0; +} + + +int igmp6_event_report(struct sk_buff *skb) +{ + struct ifmcaddr6 *ma; + struct in6_addr *addrp; + struct inet6_dev *idev; + struct icmp6hdr *hdr; + int addr_type; + + /* Our own report looped back. Ignore it. */ + if (skb->pkt_type == PACKET_LOOPBACK) + return 0; + + if (!pskb_may_pull(skb, sizeof(struct in6_addr))) + return -EINVAL; + + hdr = (struct icmp6hdr*) skb->h.raw; + + /* Drop reports with not link local source */ + addr_type = ipv6_addr_type(&skb->nh.ipv6h->saddr); + if (addr_type != IPV6_ADDR_ANY && + !(addr_type&IPV6_ADDR_LINKLOCAL)) + return -EINVAL; + + addrp = (struct in6_addr *) (hdr + 1); + + idev = in6_dev_get(skb->dev); + if (idev == NULL) + return -ENODEV; + + /* + * Cancel the timer for this group + */ + + read_lock_bh(&idev->lock); + for (ma = idev->mc_list; ma; ma=ma->next) { + if (ipv6_addr_equal(&ma->mca_addr, addrp)) { + spin_lock(&ma->mca_lock); + if (del_timer(&ma->mca_timer)) + atomic_dec(&ma->mca_refcnt); + ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); + spin_unlock(&ma->mca_lock); + break; + } + } + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + return 0; +} + +static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type, + int gdeleted, int sdeleted) +{ + switch (type) { + case MLD2_MODE_IS_INCLUDE: + case MLD2_MODE_IS_EXCLUDE: + if (gdeleted || sdeleted) + return 0; + return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp); + case MLD2_CHANGE_TO_INCLUDE: + if (gdeleted || sdeleted) + return 0; + return psf->sf_count[MCAST_INCLUDE] != 0; + case MLD2_CHANGE_TO_EXCLUDE: + if (gdeleted || sdeleted) + return 0; + if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || + psf->sf_count[MCAST_INCLUDE]) + return 0; + return pmc->mca_sfcount[MCAST_EXCLUDE] == + psf->sf_count[MCAST_EXCLUDE]; + case MLD2_ALLOW_NEW_SOURCES: + if (gdeleted || !psf->sf_crcount) + return 0; + return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted; + case MLD2_BLOCK_OLD_SOURCES: + if (pmc->mca_sfmode == MCAST_INCLUDE) + return gdeleted || (psf->sf_crcount && sdeleted); + return psf->sf_crcount && !gdeleted && !sdeleted; + } + return 0; +} + +static int +mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted) +{ + struct ip6_sf_list *psf; + int scount = 0; + + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { + if (!is_in(pmc, psf, type, gdeleted, sdeleted)) + continue; + scount++; + } + return scount; +} + +static struct sk_buff *mld_newpack(struct net_device *dev, int size) +{ + struct sock *sk = igmp6_socket->sk; + struct sk_buff *skb; + struct mld2_report *pmr; + struct in6_addr addr_buf; + int err; + u8 ra[8] = { IPPROTO_ICMPV6, 0, + IPV6_TLV_ROUTERALERT, 2, 0, 0, + IPV6_TLV_PADN, 0 }; + + /* we assume size > sizeof(ra) here */ + skb = sock_alloc_send_skb(sk, size + LL_RESERVED_SPACE(dev), 1, &err); + + if (skb == 0) + return NULL; + + skb_reserve(skb, LL_RESERVED_SPACE(dev)); + if (dev->hard_header) { + unsigned char ha[MAX_ADDR_LEN]; + + ndisc_mc_map(&mld2_all_mcr, ha, dev, 1); + if (dev->hard_header(skb, dev, ETH_P_IPV6,ha,NULL,size) < 0) { + kfree_skb(skb); + return NULL; + } + } + + if (ipv6_get_lladdr(dev, &addr_buf)) { + /* <draft-ietf-magma-mld-source-05.txt>: + * use unspecified address as the source address + * when a valid link-local address is not available. + */ + memset(&addr_buf, 0, sizeof(addr_buf)); + } + + ip6_nd_hdr(sk, skb, dev, &addr_buf, &mld2_all_mcr, NEXTHDR_HOP, 0); + + memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); + + pmr =(struct mld2_report *)skb_put(skb, sizeof(*pmr)); + skb->h.raw = (unsigned char *)pmr; + pmr->type = ICMPV6_MLD2_REPORT; + pmr->resv1 = 0; + pmr->csum = 0; + pmr->resv2 = 0; + pmr->ngrec = 0; + return skb; +} + +static void mld_sendpack(struct sk_buff *skb) +{ + struct ipv6hdr *pip6 = skb->nh.ipv6h; + struct mld2_report *pmr = (struct mld2_report *)skb->h.raw; + int payload_len, mldlen; + struct inet6_dev *idev = in6_dev_get(skb->dev); + int err; + + IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); + payload_len = skb->tail - (unsigned char *)skb->nh.ipv6h - + sizeof(struct ipv6hdr); + mldlen = skb->tail - skb->h.raw; + pip6->payload_len = htons(payload_len); + + pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, + IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0)); + err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, + dev_queue_xmit); + if (!err) { + ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); + IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); + } else + IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); + + if (likely(idev != NULL)) + in6_dev_put(idev); +} + +static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel) +{ + return sizeof(struct mld2_grec) + 4*mld_scount(pmc,type,gdel,sdel); +} + +static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc, + int type, struct mld2_grec **ppgr) +{ + struct net_device *dev = pmc->idev->dev; + struct mld2_report *pmr; + struct mld2_grec *pgr; + + if (!skb) + skb = mld_newpack(dev, dev->mtu); + if (!skb) + return NULL; + pgr = (struct mld2_grec *)skb_put(skb, sizeof(struct mld2_grec)); + pgr->grec_type = type; + pgr->grec_auxwords = 0; + pgr->grec_nsrcs = 0; + pgr->grec_mca = pmc->mca_addr; /* structure copy */ + pmr = (struct mld2_report *)skb->h.raw; + pmr->ngrec = htons(ntohs(pmr->ngrec)+1); + *ppgr = pgr; + return skb; +} + +#define AVAILABLE(skb) ((skb) ? ((skb)->dev ? (skb)->dev->mtu - (skb)->len : \ + skb_tailroom(skb)) : 0) + +static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, + int type, int gdeleted, int sdeleted) +{ + struct net_device *dev = pmc->idev->dev; + struct mld2_report *pmr; + struct mld2_grec *pgr = NULL; + struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list; + int scount, first, isquery, truncate; + + if (pmc->mca_flags & MAF_NOREPORT) + return skb; + + isquery = type == MLD2_MODE_IS_INCLUDE || + type == MLD2_MODE_IS_EXCLUDE; + truncate = type == MLD2_MODE_IS_EXCLUDE || + type == MLD2_CHANGE_TO_EXCLUDE; + + psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; + + if (!*psf_list) { + if (type == MLD2_ALLOW_NEW_SOURCES || + type == MLD2_BLOCK_OLD_SOURCES) + return skb; + if (pmc->mca_crcount || isquery) { + /* make sure we have room for group header and at + * least one source. + */ + if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+ + sizeof(struct in6_addr)) { + mld_sendpack(skb); + skb = NULL; /* add_grhead will get a new one */ + } + skb = add_grhead(skb, pmc, type, &pgr); + } + return skb; + } + pmr = skb ? (struct mld2_report *)skb->h.raw : NULL; + + /* EX and TO_EX get a fresh packet, if needed */ + if (truncate) { + if (pmr && pmr->ngrec && + AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { + if (skb) + mld_sendpack(skb); + skb = mld_newpack(dev, dev->mtu); + } + } + first = 1; + scount = 0; + psf_prev = NULL; + for (psf=*psf_list; psf; psf=psf_next) { + struct in6_addr *psrc; + + psf_next = psf->sf_next; + + if (!is_in(pmc, psf, type, gdeleted, sdeleted)) { + psf_prev = psf; + continue; + } + + /* clear marks on query responses */ + if (isquery) + psf->sf_gsresp = 0; + + if (AVAILABLE(skb) < sizeof(*psrc) + + first*sizeof(struct mld2_grec)) { + if (truncate && !first) + break; /* truncate these */ + if (pgr) + pgr->grec_nsrcs = htons(scount); + if (skb) + mld_sendpack(skb); + skb = mld_newpack(dev, dev->mtu); + first = 1; + scount = 0; + } + if (first) { + skb = add_grhead(skb, pmc, type, &pgr); + first = 0; + } + psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); + *psrc = psf->sf_addr; + scount++; + if ((type == MLD2_ALLOW_NEW_SOURCES || + type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) { + psf->sf_crcount--; + if ((sdeleted || gdeleted) && psf->sf_crcount == 0) { + if (psf_prev) + psf_prev->sf_next = psf->sf_next; + else + *psf_list = psf->sf_next; + kfree(psf); + continue; + } + } + psf_prev = psf; + } + if (pgr) + pgr->grec_nsrcs = htons(scount); + + if (isquery) + pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */ + return skb; +} + +static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc) +{ + struct sk_buff *skb = NULL; + int type; + + if (!pmc) { + read_lock_bh(&idev->lock); + for (pmc=idev->mc_list; pmc; pmc=pmc->next) { + if (pmc->mca_flags & MAF_NOREPORT) + continue; + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + type = MLD2_MODE_IS_EXCLUDE; + else + type = MLD2_MODE_IS_INCLUDE; + skb = add_grec(skb, pmc, type, 0, 0); + spin_unlock_bh(&pmc->mca_lock); + } + read_unlock_bh(&idev->lock); + } else { + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + type = MLD2_MODE_IS_EXCLUDE; + else + type = MLD2_MODE_IS_INCLUDE; + skb = add_grec(skb, pmc, type, 0, 0); + spin_unlock_bh(&pmc->mca_lock); + } + if (skb) + mld_sendpack(skb); +} + +/* + * remove zero-count source records from a source filter list + */ +static void mld_clear_zeros(struct ip6_sf_list **ppsf) +{ + struct ip6_sf_list *psf_prev, *psf_next, *psf; + + psf_prev = NULL; + for (psf=*ppsf; psf; psf = psf_next) { + psf_next = psf->sf_next; + if (psf->sf_crcount == 0) { + if (psf_prev) + psf_prev->sf_next = psf->sf_next; + else + *ppsf = psf->sf_next; + kfree(psf); + } else + psf_prev = psf; + } +} + +static void mld_send_cr(struct inet6_dev *idev) +{ + struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next; + struct sk_buff *skb = NULL; + int type, dtype; + + read_lock_bh(&idev->lock); + write_lock_bh(&idev->mc_lock); + + /* deleted MCA's */ + pmc_prev = NULL; + for (pmc=idev->mc_tomb; pmc; pmc=pmc_next) { + pmc_next = pmc->next; + if (pmc->mca_sfmode == MCAST_INCLUDE) { + type = MLD2_BLOCK_OLD_SOURCES; + dtype = MLD2_BLOCK_OLD_SOURCES; + skb = add_grec(skb, pmc, type, 1, 0); + skb = add_grec(skb, pmc, dtype, 1, 1); + } + if (pmc->mca_crcount) { + pmc->mca_crcount--; + if (pmc->mca_sfmode == MCAST_EXCLUDE) { + type = MLD2_CHANGE_TO_INCLUDE; + skb = add_grec(skb, pmc, type, 1, 0); + } + if (pmc->mca_crcount == 0) { + mld_clear_zeros(&pmc->mca_tomb); + mld_clear_zeros(&pmc->mca_sources); + } + } + if (pmc->mca_crcount == 0 && !pmc->mca_tomb && + !pmc->mca_sources) { + if (pmc_prev) + pmc_prev->next = pmc_next; + else + idev->mc_tomb = pmc_next; + in6_dev_put(pmc->idev); + kfree(pmc); + } else + pmc_prev = pmc; + } + write_unlock_bh(&idev->mc_lock); + + /* change recs */ + for (pmc=idev->mc_list; pmc; pmc=pmc->next) { + spin_lock_bh(&pmc->mca_lock); + if (pmc->mca_sfcount[MCAST_EXCLUDE]) { + type = MLD2_BLOCK_OLD_SOURCES; + dtype = MLD2_ALLOW_NEW_SOURCES; + } else { + type = MLD2_ALLOW_NEW_SOURCES; + dtype = MLD2_BLOCK_OLD_SOURCES; + } + skb = add_grec(skb, pmc, type, 0, 0); + skb = add_grec(skb, pmc, dtype, 0, 1); /* deleted sources */ + + /* filter mode changes */ + if (pmc->mca_crcount) { + pmc->mca_crcount--; + if (pmc->mca_sfmode == MCAST_EXCLUDE) + type = MLD2_CHANGE_TO_EXCLUDE; + else + type = MLD2_CHANGE_TO_INCLUDE; + skb = add_grec(skb, pmc, type, 0, 0); + } + spin_unlock_bh(&pmc->mca_lock); + } + read_unlock_bh(&idev->lock); + if (!skb) + return; + (void) mld_sendpack(skb); +} + +static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type) +{ + struct sock *sk = igmp6_socket->sk; + struct inet6_dev *idev; + struct sk_buff *skb; + struct icmp6hdr *hdr; + struct in6_addr *snd_addr; + struct in6_addr *addrp; + struct in6_addr addr_buf; + struct in6_addr all_routers; + int err, len, payload_len, full_len; + u8 ra[8] = { IPPROTO_ICMPV6, 0, + IPV6_TLV_ROUTERALERT, 2, 0, 0, + IPV6_TLV_PADN, 0 }; + + IP6_INC_STATS(IPSTATS_MIB_OUTREQUESTS); + snd_addr = addr; + if (type == ICMPV6_MGM_REDUCTION) { + snd_addr = &all_routers; + ipv6_addr_all_routers(&all_routers); + } + + len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); + payload_len = len + sizeof(ra); + full_len = sizeof(struct ipv6hdr) + payload_len; + + skb = sock_alloc_send_skb(sk, LL_RESERVED_SPACE(dev) + full_len, 1, &err); + + if (skb == NULL) { + IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); + return; + } + + skb_reserve(skb, LL_RESERVED_SPACE(dev)); + if (dev->hard_header) { + unsigned char ha[MAX_ADDR_LEN]; + ndisc_mc_map(snd_addr, ha, dev, 1); + if (dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, full_len) < 0) + goto out; + } + + if (ipv6_get_lladdr(dev, &addr_buf)) { + /* <draft-ietf-magma-mld-source-05.txt>: + * use unspecified address as the source address + * when a valid link-local address is not available. + */ + memset(&addr_buf, 0, sizeof(addr_buf)); + } + + ip6_nd_hdr(sk, skb, dev, &addr_buf, snd_addr, NEXTHDR_HOP, payload_len); + + memcpy(skb_put(skb, sizeof(ra)), ra, sizeof(ra)); + + hdr = (struct icmp6hdr *) skb_put(skb, sizeof(struct icmp6hdr)); + memset(hdr, 0, sizeof(struct icmp6hdr)); + hdr->icmp6_type = type; + + addrp = (struct in6_addr *) skb_put(skb, sizeof(struct in6_addr)); + ipv6_addr_copy(addrp, addr); + + hdr->icmp6_cksum = csum_ipv6_magic(&addr_buf, snd_addr, len, + IPPROTO_ICMPV6, + csum_partial((__u8 *) hdr, len, 0)); + + idev = in6_dev_get(skb->dev); + + err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, + dev_queue_xmit); + if (!err) { + if (type == ICMPV6_MGM_REDUCTION) + ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS); + else + ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBRESPONSES); + ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); + IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS); + } else + IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); + + if (likely(idev != NULL)) + in6_dev_put(idev); + return; + +out: + IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS); + kfree_skb(skb); +} + +static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, + struct in6_addr *psfsrc) +{ + struct ip6_sf_list *psf, *psf_prev; + int rv = 0; + + psf_prev = NULL; + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { + if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) + break; + psf_prev = psf; + } + if (!psf || psf->sf_count[sfmode] == 0) { + /* source filter not found, or count wrong => bug */ + return -ESRCH; + } + psf->sf_count[sfmode]--; + if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) { + struct inet6_dev *idev = pmc->idev; + + /* no more filters for this source */ + if (psf_prev) + psf_prev->sf_next = psf->sf_next; + else + pmc->mca_sources = psf->sf_next; + if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) && + !MLD_V1_SEEN(idev)) { + psf->sf_crcount = idev->mc_qrv; + psf->sf_next = pmc->mca_tomb; + pmc->mca_tomb = psf; + rv = 1; + } else + kfree(psf); + } + return rv; +} + +static int ip6_mc_del_src(struct inet6_dev *idev, struct in6_addr *pmca, + int sfmode, int sfcount, struct in6_addr *psfsrc, + int delta) +{ + struct ifmcaddr6 *pmc; + int changerec = 0; + int i, err; + + if (!idev) + return -ENODEV; + read_lock_bh(&idev->lock); + for (pmc=idev->mc_list; pmc; pmc=pmc->next) { + if (ipv6_addr_equal(pmca, &pmc->mca_addr)) + break; + } + if (!pmc) { + /* MCA not found?? bug */ + read_unlock_bh(&idev->lock); + return -ESRCH; + } + spin_lock_bh(&pmc->mca_lock); + sf_markstate(pmc); + if (!delta) { + if (!pmc->mca_sfcount[sfmode]) { + spin_unlock_bh(&pmc->mca_lock); + read_unlock_bh(&idev->lock); + return -EINVAL; + } + pmc->mca_sfcount[sfmode]--; + } + err = 0; + for (i=0; i<sfcount; i++) { + int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); + + changerec |= rv > 0; + if (!err && rv < 0) + err = rv; + } + if (pmc->mca_sfmode == MCAST_EXCLUDE && + pmc->mca_sfcount[MCAST_EXCLUDE] == 0 && + pmc->mca_sfcount[MCAST_INCLUDE]) { + struct ip6_sf_list *psf; + + /* filter mode change */ + pmc->mca_sfmode = MCAST_INCLUDE; + pmc->mca_crcount = idev->mc_qrv; + idev->mc_ifc_count = pmc->mca_crcount; + for (psf=pmc->mca_sources; psf; psf = psf->sf_next) + psf->sf_crcount = 0; + mld_ifc_event(pmc->idev); + } else if (sf_setstate(pmc) || changerec) + mld_ifc_event(pmc->idev); + spin_unlock_bh(&pmc->mca_lock); + read_unlock_bh(&idev->lock); + return err; +} + +/* + * Add multicast single-source filter to the interface list + */ +static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode, + struct in6_addr *psfsrc, int delta) +{ + struct ip6_sf_list *psf, *psf_prev; + + psf_prev = NULL; + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { + if (ipv6_addr_equal(&psf->sf_addr, psfsrc)) + break; + psf_prev = psf; + } + if (!psf) { + psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC); + if (!psf) + return -ENOBUFS; + memset(psf, 0, sizeof(*psf)); + psf->sf_addr = *psfsrc; + if (psf_prev) { + psf_prev->sf_next = psf; + } else + pmc->mca_sources = psf; + } + psf->sf_count[sfmode]++; + return 0; +} + +static void sf_markstate(struct ifmcaddr6 *pmc) +{ + struct ip6_sf_list *psf; + int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; + + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) + if (pmc->mca_sfcount[MCAST_EXCLUDE]) { + psf->sf_oldin = mca_xcount == + psf->sf_count[MCAST_EXCLUDE] && + !psf->sf_count[MCAST_INCLUDE]; + } else + psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0; +} + +static int sf_setstate(struct ifmcaddr6 *pmc) +{ + struct ip6_sf_list *psf; + int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE]; + int qrv = pmc->idev->mc_qrv; + int new_in, rv; + + rv = 0; + for (psf=pmc->mca_sources; psf; psf=psf->sf_next) { + if (pmc->mca_sfcount[MCAST_EXCLUDE]) { + new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] && + !psf->sf_count[MCAST_INCLUDE]; + } else + new_in = psf->sf_count[MCAST_INCLUDE] != 0; + if (new_in != psf->sf_oldin) { + psf->sf_crcount = qrv; + rv++; + } + } + return rv; +} + +/* + * Add multicast source filter list to the interface list + */ +static int ip6_mc_add_src(struct inet6_dev *idev, struct in6_addr *pmca, + int sfmode, int sfcount, struct in6_addr *psfsrc, + int delta) +{ + struct ifmcaddr6 *pmc; + int isexclude; + int i, err; + + if (!idev) + return -ENODEV; + read_lock_bh(&idev->lock); + for (pmc=idev->mc_list; pmc; pmc=pmc->next) { + if (ipv6_addr_equal(pmca, &pmc->mca_addr)) + break; + } + if (!pmc) { + /* MCA not found?? bug */ + read_unlock_bh(&idev->lock); + return -ESRCH; + } + spin_lock_bh(&pmc->mca_lock); + + sf_markstate(pmc); + isexclude = pmc->mca_sfmode == MCAST_EXCLUDE; + if (!delta) + pmc->mca_sfcount[sfmode]++; + err = 0; + for (i=0; i<sfcount; i++) { + err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i], delta); + if (err) + break; + } + if (err) { + int j; + + if (!delta) + pmc->mca_sfcount[sfmode]--; + for (j=0; j<i; j++) + (void) ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]); + } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { + struct inet6_dev *idev = pmc->idev; + struct ip6_sf_list *psf; + + /* filter mode change */ + if (pmc->mca_sfcount[MCAST_EXCLUDE]) + pmc->mca_sfmode = MCAST_EXCLUDE; + else if (pmc->mca_sfcount[MCAST_INCLUDE]) + pmc->mca_sfmode = MCAST_INCLUDE; + /* else no filters; keep old mode for reports */ + + pmc->mca_crcount = idev->mc_qrv; + idev->mc_ifc_count = pmc->mca_crcount; + for (psf=pmc->mca_sources; psf; psf = psf->sf_next) + psf->sf_crcount = 0; + mld_ifc_event(idev); + } else if (sf_setstate(pmc)) + mld_ifc_event(idev); + spin_unlock_bh(&pmc->mca_lock); + read_unlock_bh(&idev->lock); + return err; +} + +static void ip6_mc_clear_src(struct ifmcaddr6 *pmc) +{ + struct ip6_sf_list *psf, *nextpsf; + + for (psf=pmc->mca_tomb; psf; psf=nextpsf) { + nextpsf = psf->sf_next; + kfree(psf); + } + pmc->mca_tomb = NULL; + for (psf=pmc->mca_sources; psf; psf=nextpsf) { + nextpsf = psf->sf_next; + kfree(psf); + } + pmc->mca_sources = NULL; + pmc->mca_sfmode = MCAST_EXCLUDE; + pmc->mca_sfcount[MCAST_EXCLUDE] = 0; + pmc->mca_sfcount[MCAST_EXCLUDE] = 1; +} + + +static void igmp6_join_group(struct ifmcaddr6 *ma) +{ + unsigned long delay; + + if (ma->mca_flags & MAF_NOREPORT) + return; + + igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); + + delay = net_random() % IGMP6_UNSOLICITED_IVAL; + + spin_lock_bh(&ma->mca_lock); + if (del_timer(&ma->mca_timer)) { + atomic_dec(&ma->mca_refcnt); + delay = ma->mca_timer.expires - jiffies; + } + + if (!mod_timer(&ma->mca_timer, jiffies + delay)) + atomic_inc(&ma->mca_refcnt); + ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER; + spin_unlock_bh(&ma->mca_lock); +} + +static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, + struct inet6_dev *idev) +{ + int err; + + if (iml->sflist == 0) { + /* any-source empty exclude case */ + return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); + } + err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, + iml->sflist->sl_count, iml->sflist->sl_addr, 0); + sock_kfree_s(sk, iml->sflist, IP6_SFLSIZE(iml->sflist->sl_max)); + iml->sflist = NULL; + return err; +} + +static void igmp6_leave_group(struct ifmcaddr6 *ma) +{ + if (MLD_V1_SEEN(ma->idev)) { + if (ma->mca_flags & MAF_LAST_REPORTER) + igmp6_send(&ma->mca_addr, ma->idev->dev, + ICMPV6_MGM_REDUCTION); + } else { + mld_add_delrec(ma->idev, ma); + mld_ifc_event(ma->idev); + } +} + +static void mld_gq_timer_expire(unsigned long data) +{ + struct inet6_dev *idev = (struct inet6_dev *)data; + + idev->mc_gq_running = 0; + mld_send_report(idev, NULL); + __in6_dev_put(idev); +} + +static void mld_ifc_timer_expire(unsigned long data) +{ + struct inet6_dev *idev = (struct inet6_dev *)data; + + mld_send_cr(idev); + if (idev->mc_ifc_count) { + idev->mc_ifc_count--; + if (idev->mc_ifc_count) + mld_ifc_start_timer(idev, idev->mc_maxdelay); + } + __in6_dev_put(idev); +} + +static void mld_ifc_event(struct inet6_dev *idev) +{ + if (MLD_V1_SEEN(idev)) + return; + idev->mc_ifc_count = idev->mc_qrv; + mld_ifc_start_timer(idev, 1); +} + + +static void igmp6_timer_handler(unsigned long data) +{ + struct ifmcaddr6 *ma = (struct ifmcaddr6 *) data; + + if (MLD_V1_SEEN(ma->idev)) + igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT); + else + mld_send_report(ma->idev, ma); + + spin_lock(&ma->mca_lock); + ma->mca_flags |= MAF_LAST_REPORTER; + ma->mca_flags &= ~MAF_TIMER_RUNNING; + spin_unlock(&ma->mca_lock); + ma_put(ma); +} + +/* Device going down */ + +void ipv6_mc_down(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + + /* Withdraw multicast list */ + + read_lock_bh(&idev->lock); + idev->mc_ifc_count = 0; + if (del_timer(&idev->mc_ifc_timer)) + __in6_dev_put(idev); + idev->mc_gq_running = 0; + if (del_timer(&idev->mc_gq_timer)) + __in6_dev_put(idev); + + for (i = idev->mc_list; i; i=i->next) + igmp6_group_dropped(i); + read_unlock_bh(&idev->lock); + + mld_clear_delrec(idev); +} + + +/* Device going up */ + +void ipv6_mc_up(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + + /* Install multicast list, except for all-nodes (already installed) */ + + read_lock_bh(&idev->lock); + for (i = idev->mc_list; i; i=i->next) + igmp6_group_added(i); + read_unlock_bh(&idev->lock); +} + +/* IPv6 device initialization. */ + +void ipv6_mc_init_dev(struct inet6_dev *idev) +{ + struct in6_addr maddr; + + write_lock_bh(&idev->lock); + rwlock_init(&idev->mc_lock); + idev->mc_gq_running = 0; + init_timer(&idev->mc_gq_timer); + idev->mc_gq_timer.data = (unsigned long) idev; + idev->mc_gq_timer.function = &mld_gq_timer_expire; + idev->mc_tomb = NULL; + idev->mc_ifc_count = 0; + init_timer(&idev->mc_ifc_timer); + idev->mc_ifc_timer.data = (unsigned long) idev; + idev->mc_ifc_timer.function = &mld_ifc_timer_expire; + idev->mc_qrv = MLD_QRV_DEFAULT; + idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL; + idev->mc_v1_seen = 0; + write_unlock_bh(&idev->lock); + + /* Add all-nodes address. */ + ipv6_addr_all_nodes(&maddr); + ipv6_dev_mc_inc(idev->dev, &maddr); +} + +/* + * Device is about to be destroyed: clean up. + */ + +void ipv6_mc_destroy_dev(struct inet6_dev *idev) +{ + struct ifmcaddr6 *i; + struct in6_addr maddr; + + /* Deactivate timers */ + ipv6_mc_down(idev); + + /* Delete all-nodes address. */ + ipv6_addr_all_nodes(&maddr); + + /* We cannot call ipv6_dev_mc_dec() directly, our caller in + * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will + * fail. + */ + __ipv6_dev_mc_dec(idev, &maddr); + + if (idev->cnf.forwarding) { + ipv6_addr_all_routers(&maddr); + __ipv6_dev_mc_dec(idev, &maddr); + } + + write_lock_bh(&idev->lock); + while ((i = idev->mc_list) != NULL) { + idev->mc_list = i->next; + write_unlock_bh(&idev->lock); + + igmp6_group_dropped(i); + ma_put(i); + + write_lock_bh(&idev->lock); + } + write_unlock_bh(&idev->lock); +} + +#ifdef CONFIG_PROC_FS +struct igmp6_mc_iter_state { + struct net_device *dev; + struct inet6_dev *idev; +}; + +#define igmp6_mc_seq_private(seq) ((struct igmp6_mc_iter_state *)(seq)->private) + +static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq) +{ + struct ifmcaddr6 *im = NULL; + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + + for (state->dev = dev_base, state->idev = NULL; + state->dev; + state->dev = state->dev->next) { + struct inet6_dev *idev; + idev = in6_dev_get(state->dev); + if (!idev) + continue; + read_lock_bh(&idev->lock); + im = idev->mc_list; + if (im) { + state->idev = idev; + break; + } + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + } + return im; +} + +static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im) +{ + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + + im = im->next; + while (!im) { + if (likely(state->idev != NULL)) { + read_unlock_bh(&state->idev->lock); + in6_dev_put(state->idev); + } + state->dev = state->dev->next; + if (!state->dev) { + state->idev = NULL; + break; + } + state->idev = in6_dev_get(state->dev); + if (!state->idev) + continue; + read_lock_bh(&state->idev->lock); + im = state->idev->mc_list; + } + return im; +} + +static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos) +{ + struct ifmcaddr6 *im = igmp6_mc_get_first(seq); + if (im) + while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL) + --pos; + return pos ? NULL : im; +} + +static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos) +{ + read_lock(&dev_base_lock); + return igmp6_mc_get_idx(seq, *pos); +} + +static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct ifmcaddr6 *im; + im = igmp6_mc_get_next(seq, v); + ++*pos; + return im; +} + +static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) +{ + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + if (likely(state->idev != NULL)) { + read_unlock_bh(&state->idev->lock); + in6_dev_put(state->idev); + state->idev = NULL; + } + state->dev = NULL; + read_unlock(&dev_base_lock); +} + +static int igmp6_mc_seq_show(struct seq_file *seq, void *v) +{ + struct ifmcaddr6 *im = (struct ifmcaddr6 *)v; + struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); + + seq_printf(seq, + "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n", + state->dev->ifindex, state->dev->name, + NIP6(im->mca_addr), + im->mca_users, im->mca_flags, + (im->mca_flags&MAF_TIMER_RUNNING) ? + jiffies_to_clock_t(im->mca_timer.expires-jiffies) : 0); + return 0; +} + +static struct seq_operations igmp6_mc_seq_ops = { + .start = igmp6_mc_seq_start, + .next = igmp6_mc_seq_next, + .stop = igmp6_mc_seq_stop, + .show = igmp6_mc_seq_show, +}; + +static int igmp6_mc_seq_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int rc = -ENOMEM; + struct igmp6_mc_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); + + if (!s) + goto out; + + rc = seq_open(file, &igmp6_mc_seq_ops); + if (rc) + goto out_kfree; + + seq = file->private_data; + seq->private = s; + memset(s, 0, sizeof(*s)); +out: + return rc; +out_kfree: + kfree(s); + goto out; +} + +static struct file_operations igmp6_mc_seq_fops = { + .owner = THIS_MODULE, + .open = igmp6_mc_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; + +struct igmp6_mcf_iter_state { + struct net_device *dev; + struct inet6_dev *idev; + struct ifmcaddr6 *im; +}; + +#define igmp6_mcf_seq_private(seq) ((struct igmp6_mcf_iter_state *)(seq)->private) + +static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq) +{ + struct ip6_sf_list *psf = NULL; + struct ifmcaddr6 *im = NULL; + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + + for (state->dev = dev_base, state->idev = NULL, state->im = NULL; + state->dev; + state->dev = state->dev->next) { + struct inet6_dev *idev; + idev = in6_dev_get(state->dev); + if (unlikely(idev == NULL)) + continue; + read_lock_bh(&idev->lock); + im = idev->mc_list; + if (likely(im != NULL)) { + spin_lock_bh(&im->mca_lock); + psf = im->mca_sources; + if (likely(psf != NULL)) { + state->im = im; + state->idev = idev; + break; + } + spin_unlock_bh(&im->mca_lock); + } + read_unlock_bh(&idev->lock); + in6_dev_put(idev); + } + return psf; +} + +static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf) +{ + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + + psf = psf->sf_next; + while (!psf) { + spin_unlock_bh(&state->im->mca_lock); + state->im = state->im->next; + while (!state->im) { + if (likely(state->idev != NULL)) { + read_unlock_bh(&state->idev->lock); + in6_dev_put(state->idev); + } + state->dev = state->dev->next; + if (!state->dev) { + state->idev = NULL; + goto out; + } + state->idev = in6_dev_get(state->dev); + if (!state->idev) + continue; + read_lock_bh(&state->idev->lock); + state->im = state->idev->mc_list; + } + if (!state->im) + break; + spin_lock_bh(&state->im->mca_lock); + psf = state->im->mca_sources; + } +out: + return psf; +} + +static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos) +{ + struct ip6_sf_list *psf = igmp6_mcf_get_first(seq); + if (psf) + while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL) + --pos; + return pos ? NULL : psf; +} + +static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos) +{ + read_lock(&dev_base_lock); + return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN; +} + +static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos) +{ + struct ip6_sf_list *psf; + if (v == SEQ_START_TOKEN) + psf = igmp6_mcf_get_first(seq); + else + psf = igmp6_mcf_get_next(seq, v); + ++*pos; + return psf; +} + +static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v) +{ + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + if (likely(state->im != NULL)) { + spin_unlock_bh(&state->im->mca_lock); + state->im = NULL; + } + if (likely(state->idev != NULL)) { + read_unlock_bh(&state->idev->lock); + in6_dev_put(state->idev); + state->idev = NULL; + } + state->dev = NULL; + read_unlock(&dev_base_lock); +} + +static int igmp6_mcf_seq_show(struct seq_file *seq, void *v) +{ + struct ip6_sf_list *psf = (struct ip6_sf_list *)v; + struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); + + if (v == SEQ_START_TOKEN) { + seq_printf(seq, + "%3s %6s " + "%32s %32s %6s %6s\n", "Idx", + "Device", "Multicast Address", + "Source Address", "INC", "EXC"); + } else { + seq_printf(seq, + "%3d %6.6s " + "%04x%04x%04x%04x%04x%04x%04x%04x " + "%04x%04x%04x%04x%04x%04x%04x%04x " + "%6lu %6lu\n", + state->dev->ifindex, state->dev->name, + NIP6(state->im->mca_addr), + NIP6(psf->sf_addr), + psf->sf_count[MCAST_INCLUDE], + psf->sf_count[MCAST_EXCLUDE]); + } + return 0; +} + +static struct seq_operations igmp6_mcf_seq_ops = { + .start = igmp6_mcf_seq_start, + .next = igmp6_mcf_seq_next, + .stop = igmp6_mcf_seq_stop, + .show = igmp6_mcf_seq_show, +}; + +static int igmp6_mcf_seq_open(struct inode *inode, struct file *file) +{ + struct seq_file *seq; + int rc = -ENOMEM; + struct igmp6_mcf_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL); + + if (!s) + goto out; + + rc = seq_open(file, &igmp6_mcf_seq_ops); + if (rc) + goto out_kfree; + + seq = file->private_data; + seq->private = s; + memset(s, 0, sizeof(*s)); +out: + return rc; +out_kfree: + kfree(s); + goto out; +} + +static struct file_operations igmp6_mcf_seq_fops = { + .owner = THIS_MODULE, + .open = igmp6_mcf_seq_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release_private, +}; +#endif + +int __init igmp6_init(struct net_proto_family *ops) +{ + struct ipv6_pinfo *np; + struct sock *sk; + int err; + + err = sock_create_kern(PF_INET6, SOCK_RAW, IPPROTO_ICMPV6, &igmp6_socket); + if (err < 0) { + printk(KERN_ERR + "Failed to initialize the IGMP6 control socket (err %d).\n", + err); + igmp6_socket = NULL; /* For safety. */ + return err; + } + + sk = igmp6_socket->sk; + sk->sk_allocation = GFP_ATOMIC; + sk->sk_prot->unhash(sk); + + np = inet6_sk(sk); + np->hop_limit = 1; + +#ifdef CONFIG_PROC_FS + proc_net_fops_create("igmp6", S_IRUGO, &igmp6_mc_seq_fops); + proc_net_fops_create("mcfilter6", S_IRUGO, &igmp6_mcf_seq_fops); +#endif + + return 0; +} + +void igmp6_cleanup(void) +{ + sock_release(igmp6_socket); + igmp6_socket = NULL; /* for safety */ + +#ifdef CONFIG_PROC_FS + proc_net_remove("mcfilter6"); + proc_net_remove("igmp6"); +#endif +} |
