/* * 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/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; __be16 grec_nsrcs; struct in6_addr grec_mca; struct in6_addr grec_src[0]; }; struct mld2_report { __u8 type; __u8 resv1; __sum16 csum; __be16 resv2; __be16 ngrec; struct mld2_grec grec[0]; }; struct mld2_query { __u8 type; __u8 code; __sum16 csum; __be16 mrc; __be16 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; __be16 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))) << \ (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 64 int sysctl_mld_max_msf __read_mostly = 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; read_lock_bh(&ipv6_sk_mc_lock); for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) { if ((ifindex == 0 || mc_lst->ifindex == ifindex) && ipv6_addr_equal(&mc_lst->addr, addr)) { read_unlock_bh(&ipv6_sk_mc_lock); return -EADDRINUSE; } } read_unlock_bh(&ipv6_sk_mc_lock); 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; rwlock_init(&mc_lst->sflock); 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); (void) ip6_mc_leave_src(sk, mc_lst, idev); if (idev) { __ipv6_dev_mc_dec(idev, &mc_lst->addr); in6_dev_put(idev); } dev_put(dev); } else (void) ip6_mc_leave_src(sk, mc_lst, NULL); sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); return 0; } } write_unlock_bh(&ipv6_sk_mc_lock); return -EADDRNOTAVAIL; } 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); (void) ip6_mc_leave_src(sk, mc_lst, idev); if (idev) { __ipv6_dev_mc_dec(idev, &mc_lst->addr); in6_dev_put(idev); } dev_put(dev); } else (void) ip6_mc_leave_src(sk, mc_lst, NULL); 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 leavegroup = 0; int pmclocked = 0; 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; read_lock_bh(&ipv6_sk_mc_lock); 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 */ err = -EINVAL; goto done; } /* if a source filter was set, must be the same mode as before */ if (pmc->sflist) { if (pmc->sfmode != omode) { err = -EINVAL; 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; } write_lock_bh(&pmc->sflock); pmclocked = 1; psl = pmc->sflist; if (!add) { if (!psl) goto done; /* err = -EADDRNOTAVAIL */ 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; /* err = -EADDRNOTAVAIL */ /* special case - (INCLUDE, empty) == LEAVE_GROUP */ if (psl->sl_count == 1 && omode == MCAST_INCLUDE) { leavegroup = 1; 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 = 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: if (pmclocked) write_unlock_bh(&pmc->sflock); read_unlock_bh(&ipv6_sk_mc_lock); read_unlock_bh(&idev->lock); in6_dev_put(idev); dev_put(dev); if (leavegroup) return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); 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 leavegroup = 0; 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 = 0; read_lock_bh(&ipv6_sk_mc_lock); if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { leavegroup = 1; goto done; } 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 */ err = -EINVAL; goto done; } if (gsf->gf_numsrc) { newpsl = 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; (void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0); } write_lock_bh(&pmc->sflock); 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; write_unlock_bh(&pmc->sflock); err = 0; done: read_unlock_bh(&ipv6_sk_mc_lock); read_unlock_bh(&idev->lock); in6_dev_put(idev); dev_put(dev); if (leavegroup) err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group); 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; /* * changes to the ipv6_mc_list require the socket lock and * a read lock on ip6_sk_mc_lock. We have the socket lock, * so reading the list is safe. */ 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; } /* changes to psl require the socket lock, a read lock on * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We * have the socket lock, so reading here is safe. */ 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; } read_lock(&mc->sflock); 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(&mc->sflock); 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 = kzalloc(sizeof(*pmc), GFP_ATOMIC); if (!pmc) return; 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 = kzalloc(sizeof(struct ifmcaddr6), GFP_ATOMIC); if (mc == NULL) { write_unlock_bh(&idev->lock); in6_dev_put(idev); return -ENOMEM; } 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 = icmp6_hdr(skb); 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; } /* mark EXCLUDE-mode sources */ static int mld_xmarksources(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++) { /* skip inactive filters */ if (pmc->mca_sfcount[MCAST_INCLUDE] || pmc->mca_sfcount[MCAST_EXCLUDE] != psf->sf_count[MCAST_EXCLUDE]) continue; if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { scount++; break; } } } pmc->mca_flags &= ~MAF_GSQUERY; if (scount == nsrcs) /* all sources excluded */ return 0; return 1; } static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, struct in6_addr *srcs) { struct ip6_sf_list *psf; int i, scount; if (pmc->mca_sfmode == MCAST_EXCLUDE) return mld_xmarksources(pmc, nsrcs, srcs); /* mark INCLUDE-mode sources */ 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; } } } if (!scount) { pmc->mca_flags &= ~MAF_GSQUERY; return 0; } pmc->mca_flags |= MAF_GSQUERY; return 1; } int igmp6_event_query(struct sk_buff *skb) { struct mld2_query *mlh2 = NULL; 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(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr); len -= skb_network_header_len(skb); /* Drop queries with not link local source */ if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL)) return -EINVAL; idev = in6_dev_get(skb->dev); if (idev == NULL) return 0; hdr = icmp6_hdr(skb); 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) { int srcs_offset = sizeof(struct mld2_query) - sizeof(struct icmp6hdr); if (!pskb_may_pull(skb, srcs_offset)) { in6_dev_put(idev); return -EINVAL; } mlh2 = (struct mld2_query *)skb_transport_header(skb); 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 */ if (mlh2->nsrcs != 0) { if (!pskb_may_pull(skb, srcs_offset + ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) { in6_dev_put(idev); return -EINVAL; } mlh2 = (struct mld2_query *)skb_transport_header(skb); mark = 1; } } 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 (!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); 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; /* send our report if the MC router may not have heard this report */ if (skb->pkt_type != PACKET_MULTICAST && skb->pkt_type != PACKET_BROADCAST) return 0; if (!pskb_may_pull(skb, sizeof(struct in6_addr))) return -EINVAL; hdr = icmp6_hdr(skb); /* Drop reports with not link local source */ addr_type = ipv6_addr_type(&ipv6_hdr(skb)->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; if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { if (pmc->mca_sfmode == MCAST_INCLUDE) return 1; /* don't include if this source is excluded * in all filters */ if (psf->sf_count[MCAST_INCLUDE]) return type == MLD2_MODE_IS_INCLUDE; return pmc->mca_sfcount[MCAST_EXCLUDE] == psf->sf_count[MCAST_EXCLUDE]; } return 0; 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 (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { /* <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)); skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data); skb_put(skb, sizeof(*pmr)); pmr = (struct mld2_report *)skb_transport_header(skb); pmr->type = ICMPV6_MLD2_REPORT; pmr->resv1 = 0; pmr->csum = 0; pmr->resv2 = 0; pmr->ngrec = 0; return skb; } static inline int mld_dev_queue_xmit2(struct sk_buff *skb) { struct net_device *dev = skb->dev; if (dev->hard_header) { unsigned char ha[MAX_ADDR_LEN]; int err; ndisc_mc_map(&ipv6_hdr(skb)->daddr, ha, dev, 1); err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len); if (err < 0) { kfree_skb(skb); return err; } } return dev_queue_xmit(skb); } static inline int mld_dev_queue_xmit(struct sk_buff *skb) { return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev, mld_dev_queue_xmit2); } static void mld_sendpack(struct sk_buff *skb) { struct ipv6hdr *pip6 = ipv6_hdr(skb); struct mld2_report *pmr = (struct mld2_report *)skb_transport_header(skb); int payload_len, mldlen; struct inet6_dev *idev = in6_dev_get(skb->dev); int err; IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); payload_len = (skb->tail - skb->network_header) - sizeof(*pip6); mldlen = skb->tail - skb->transport_header; pip6->payload_len = htons(payload_len); pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, IPPROTO_ICMPV6, csum_partial(skb_transport_header(skb), mldlen, 0)); err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev, mld_dev_queue_xmit); if (!err) { ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS); IP6_INC_STATS(idev, IPSTATS_MIB_OUTMCASTPKTS); } else IP6_INC_STATS(idev, 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) + 16 * 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_transport_header(skb); 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, stotal, 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; stotal = scount = 0; psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources; if (!*psf_list) goto empty_source; pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : 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; 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; } if (!skb) return NULL; psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc)); *psrc = psf->sf_addr; scount++; stotal++; 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; } empty_source: if (!stotal) { 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 */ if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) { mld_sendpack(skb); skb = NULL; /* add_grhead will get a new one */ } skb = add_grhead(skb, pmc, type, &pgr); } } 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) { if (pmc->mca_sfmode == MCAST_EXCLUDE) { type = MLD2_CHANGE_TO_INCLUDE; skb = add_grec(skb, pmc, type, 1, 0); } pmc->mca_crcount--; 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) { 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); pmc->mca_crcount--; } 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 }; rcu_read_lock(); IP6_INC_STATS(__in6_dev_get(dev), IPSTATS_MIB_OUTREQUESTS); rcu_read_unlock(); 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) { rcu_read_lock(); IP6_INC_STATS(__in6_dev_get(dev), IPSTATS_MIB_OUTDISCARDS); rcu_read_unlock(); return; } skb_reserve(skb, LL_RESERVED_SPACE(dev)); if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) { /* <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, mld_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(idev, IPSTATS_MIB_OUTMCASTPKTS); } else IP6_INC_STATS(idev, IPSTATS_MIB_OUTDISCARDS); if (likely(idev != NULL)) in6_dev_put(idev); return; } 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 = kzalloc(sizeof(*psf), GFP_ATOMIC); if (!psf) return -ENOBUFS; 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, *dpsf; 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) { if (!psf->sf_oldin) { struct ip6_sf_list *prev = NULL; for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) { if (ipv6_addr_equal(&dpsf->sf_addr, &psf->sf_addr)) break; prev = dpsf; } if (dpsf) { if (prev) prev->sf_next = dpsf->sf_next; else pmc->mca_tomb = dpsf->sf_next; kfree(dpsf); } psf->sf_crcount = qrv; rv++; } } else if (psf->sf_oldin) { psf->sf_crcount = 0; /* * add or update "delete" records if an active filter * is now inactive */ for (dpsf=pmc->mca_tomb; dpsf; dpsf=dpsf->sf_next) if (ipv6_addr_equal(&dpsf->sf_addr, &psf->sf_addr)) break; if (!dpsf) { dpsf = (struct ip6_sf_list *) kmalloc(sizeof(*dpsf), GFP_ATOMIC); if (!dpsf) continue; *dpsf = *psf; /* pmc->mca_lock held by callers */ dpsf->sf_next = pmc->mca_tomb; pmc->mca_tomb = dpsf; } dpsf->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_INCLUDE] = 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; /* callers have the socket lock and a write lock on ipv6_sk_mc_lock, * so no other readers or writers of iml or its sflist */ 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) { 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); } /* * 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); state->idev = NULL; for_each_netdev(state->dev) { 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 = next_net_device(state->dev); 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 " NIP6_SEQFMT " %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 const 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 = kzalloc(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; out: return rc; out_kfree: kfree(s); goto out; } static const 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); state->idev = NULL; state->im = NULL; for_each_netdev(state->dev) { 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 = next_net_device(state->dev); 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 " NIP6_SEQFMT " " NIP6_SEQFMT " %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 const 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 = kzalloc(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; out: return rc; out_kfree: kfree(s); goto out; } static const 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 }