| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* |
| * Multicast support for IPv6 |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c |
| */ |
| |
| /* 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/slab.h> |
| #include <linux/pkt_sched.h> |
| #include <net/mld.h> |
| |
| #include <linux/netfilter.h> |
| #include <linux/netfilter_ipv6.h> |
| |
| #include <net/net_namespace.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/inet_common.h> |
| |
| #include <net/ip6_checksum.h> |
| |
| /* Ensure that we have struct in6_addr aligned on 32bit word. */ |
| static int __mld2_query_bugs[] __attribute__((__unused__)) = { |
| BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4), |
| BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4), |
| BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4) |
| }; |
| |
| static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT; |
| |
| static void igmp6_join_group(struct ifmcaddr6 *ma); |
| static void igmp6_leave_group(struct ifmcaddr6 *ma); |
| static void igmp6_timer_handler(struct timer_list *t); |
| |
| static void mld_gq_timer_expire(struct timer_list *t); |
| static void mld_ifc_timer_expire(struct timer_list *t); |
| 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 ifmcaddr6 *pmc); |
| static void mld_clear_delrec(struct inet6_dev *idev); |
| static bool mld_in_v1_mode(const 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, const struct in6_addr *pmca, |
| int sfmode, int sfcount, const struct in6_addr *psfsrc, |
| int delta); |
| static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca, |
| int sfmode, int sfcount, const struct in6_addr *psfsrc, |
| int delta); |
| static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml, |
| struct inet6_dev *idev); |
| static int __ipv6_dev_mc_inc(struct net_device *dev, |
| const struct in6_addr *addr, unsigned int mode); |
| |
| #define MLD_QRV_DEFAULT 2 |
| /* RFC3810, 9.2. Query Interval */ |
| #define MLD_QI_DEFAULT (125 * HZ) |
| /* RFC3810, 9.3. Query Response Interval */ |
| #define MLD_QRI_DEFAULT (10 * HZ) |
| |
| /* RFC3810, 8.1 Query Version Distinctions */ |
| #define MLD_V1_QUERY_LEN 24 |
| #define MLD_V2_QUERY_LEN_MIN 28 |
| |
| #define IPV6_MLD_MAX_MSF 64 |
| |
| int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF; |
| int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT; |
| |
| /* |
| * socket join on multicast group |
| */ |
| |
| #define for_each_pmc_rcu(np, pmc) \ |
| for (pmc = rcu_dereference(np->ipv6_mc_list); \ |
| pmc != NULL; \ |
| pmc = rcu_dereference(pmc->next)) |
| |
| static int unsolicited_report_interval(struct inet6_dev *idev) |
| { |
| int iv; |
| |
| if (mld_in_v1_mode(idev)) |
| iv = idev->cnf.mldv1_unsolicited_report_interval; |
| else |
| iv = idev->cnf.mldv2_unsolicited_report_interval; |
| |
| return iv > 0 ? iv : 1; |
| } |
| |
| static int __ipv6_sock_mc_join(struct sock *sk, int ifindex, |
| const struct in6_addr *addr, unsigned int mode) |
| { |
| struct net_device *dev = NULL; |
| struct ipv6_mc_socklist *mc_lst; |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct net *net = sock_net(sk); |
| int err; |
| |
| ASSERT_RTNL(); |
| |
| if (!ipv6_addr_is_multicast(addr)) |
| return -EINVAL; |
| |
| rcu_read_lock(); |
| for_each_pmc_rcu(np, mc_lst) { |
| if ((ifindex == 0 || mc_lst->ifindex == ifindex) && |
| ipv6_addr_equal(&mc_lst->addr, addr)) { |
| rcu_read_unlock(); |
| return -EADDRINUSE; |
| } |
| } |
| rcu_read_unlock(); |
| |
| mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL); |
| |
| if (!mc_lst) |
| return -ENOMEM; |
| |
| mc_lst->next = NULL; |
| mc_lst->addr = *addr; |
| |
| if (ifindex == 0) { |
| struct rt6_info *rt; |
| rt = rt6_lookup(net, addr, NULL, 0, NULL, 0); |
| if (rt) { |
| dev = rt->dst.dev; |
| ip6_rt_put(rt); |
| } |
| } else |
| dev = __dev_get_by_index(net, ifindex); |
| |
| if (!dev) { |
| sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
| return -ENODEV; |
| } |
| |
| mc_lst->ifindex = dev->ifindex; |
| mc_lst->sfmode = mode; |
| 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, mode); |
| |
| if (err) { |
| sock_kfree_s(sk, mc_lst, sizeof(*mc_lst)); |
| return err; |
| } |
| |
| mc_lst->next = np->ipv6_mc_list; |
| rcu_assign_pointer(np->ipv6_mc_list, mc_lst); |
| |
| return 0; |
| } |
| |
| int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr) |
| { |
| return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE); |
| } |
| EXPORT_SYMBOL(ipv6_sock_mc_join); |
| |
| int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex, |
| const struct in6_addr *addr, unsigned int mode) |
| { |
| return __ipv6_sock_mc_join(sk, ifindex, addr, mode); |
| } |
| |
| /* |
| * socket leave on multicast group |
| */ |
| int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct ipv6_mc_socklist *mc_lst; |
| struct ipv6_mc_socklist __rcu **lnk; |
| struct net *net = sock_net(sk); |
| |
| ASSERT_RTNL(); |
| |
| if (!ipv6_addr_is_multicast(addr)) |
| return -EINVAL; |
| |
| for (lnk = &np->ipv6_mc_list; |
| (mc_lst = rtnl_dereference(*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; |
| |
| dev = __dev_get_by_index(net, 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); |
| } else |
| (void) ip6_mc_leave_src(sk, mc_lst, NULL); |
| |
| atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); |
| kfree_rcu(mc_lst, rcu); |
| return 0; |
| } |
| } |
| |
| return -EADDRNOTAVAIL; |
| } |
| EXPORT_SYMBOL(ipv6_sock_mc_drop); |
| |
| /* called with rcu_read_lock() */ |
| static struct inet6_dev *ip6_mc_find_dev_rcu(struct net *net, |
| const struct in6_addr *group, |
| int ifindex) |
| { |
| struct net_device *dev = NULL; |
| struct inet6_dev *idev = NULL; |
| |
| if (ifindex == 0) { |
| struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0); |
| |
| if (rt) { |
| dev = rt->dst.dev; |
| ip6_rt_put(rt); |
| } |
| } else |
| dev = dev_get_by_index_rcu(net, ifindex); |
| |
| if (!dev) |
| return NULL; |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| return NULL; |
| read_lock_bh(&idev->lock); |
| if (idev->dead) { |
| read_unlock_bh(&idev->lock); |
| 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; |
| struct net *net = sock_net(sk); |
| |
| ASSERT_RTNL(); |
| |
| while ((mc_lst = rtnl_dereference(np->ipv6_mc_list)) != NULL) { |
| struct net_device *dev; |
| |
| np->ipv6_mc_list = mc_lst->next; |
| |
| dev = __dev_get_by_index(net, 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); |
| } else |
| (void) ip6_mc_leave_src(sk, mc_lst, NULL); |
| |
| atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc); |
| kfree_rcu(mc_lst, rcu); |
| } |
| } |
| |
| void ipv6_sock_mc_close(struct sock *sk) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| |
| if (!rcu_access_pointer(np->ipv6_mc_list)) |
| return; |
| rtnl_lock(); |
| __ipv6_sock_mc_close(sk); |
| rtnl_unlock(); |
| } |
| |
| 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 inet6_dev *idev; |
| struct ipv6_pinfo *inet6 = inet6_sk(sk); |
| struct ip6_sf_socklist *psl; |
| struct net *net = sock_net(sk); |
| int i, j, rv; |
| int leavegroup = 0; |
| int pmclocked = 0; |
| int err; |
| |
| 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; |
| |
| rcu_read_lock(); |
| idev = ip6_mc_find_dev_rcu(net, group, pgsr->gsr_interface); |
| if (!idev) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| |
| err = -EADDRNOTAVAIL; |
| |
| for_each_pmc_rcu(inet6, pmc) { |
| 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(&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 = !ipv6_addr_equal(&psl->sl_addr[i], source); |
| 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 = !ipv6_addr_equal(&psl->sl_addr[i], source); |
| if (rv == 0) /* There is an error in the address. */ |
| 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(&pmc->sflock); |
| read_unlock_bh(&idev->lock); |
| rcu_read_unlock(); |
| if (leavegroup) |
| err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group); |
| return err; |
| } |
| |
| int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf) |
| { |
| const struct in6_addr *group; |
| struct ipv6_mc_socklist *pmc; |
| struct inet6_dev *idev; |
| struct ipv6_pinfo *inet6 = inet6_sk(sk); |
| struct ip6_sf_socklist *newpsl, *psl; |
| struct net *net = sock_net(sk); |
| 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; |
| |
| rcu_read_lock(); |
| idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); |
| |
| if (!idev) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| |
| err = 0; |
| |
| if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) { |
| leavegroup = 1; |
| goto done; |
| } |
| |
| for_each_pmc_rcu(inet6, pmc) { |
| 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(&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(&pmc->sflock); |
| err = 0; |
| done: |
| read_unlock_bh(&idev->lock); |
| rcu_read_unlock(); |
| 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; |
| const struct in6_addr *group; |
| struct ipv6_mc_socklist *pmc; |
| struct inet6_dev *idev; |
| struct ipv6_pinfo *inet6 = inet6_sk(sk); |
| struct ip6_sf_socklist *psl; |
| struct net *net = sock_net(sk); |
| |
| group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr; |
| |
| if (!ipv6_addr_is_multicast(group)) |
| return -EINVAL; |
| |
| rcu_read_lock(); |
| idev = ip6_mc_find_dev_rcu(net, group, gsf->gf_interface); |
| |
| if (!idev) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| |
| err = -EADDRNOTAVAIL; |
| /* changes to the ipv6_mc_list require the socket lock and |
| * rtnl lock. We have the socket lock and rcu read lock, |
| * so reading the list is safe. |
| */ |
| |
| for_each_pmc_rcu(inet6, pmc) { |
| 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); |
| rcu_read_unlock(); |
| |
| 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, 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); |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr, |
| const struct in6_addr *src_addr) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct ipv6_mc_socklist *mc; |
| struct ip6_sf_socklist *psl; |
| bool rv = true; |
| |
| rcu_read_lock(); |
| for_each_pmc_rcu(np, mc) { |
| if (ipv6_addr_equal(&mc->addr, mc_addr)) |
| break; |
| } |
| if (!mc) { |
| rcu_read_unlock(); |
| return np->mc_all; |
| } |
| 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 = false; |
| if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count) |
| rv = false; |
| } |
| read_unlock(&mc->sflock); |
| rcu_read_unlock(); |
| |
| return rv; |
| } |
| |
| static void igmp6_group_added(struct ifmcaddr6 *mc) |
| { |
| struct net_device *dev = mc->idev->dev; |
| char buf[MAX_ADDR_LEN]; |
| |
| if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < |
| IPV6_ADDR_SCOPE_LINKLOCAL) |
| return; |
| |
| 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); |
| } |
| spin_unlock_bh(&mc->mca_lock); |
| |
| if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT)) |
| return; |
| |
| if (mld_in_v1_mode(mc->idev)) { |
| igmp6_join_group(mc); |
| return; |
| } |
| /* else v2 */ |
| |
| /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we |
| * should not send filter-mode change record as the mode |
| * should be from IN() to IN(A). |
| */ |
| if (mc->mca_sfmode == MCAST_EXCLUDE) |
| 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]; |
| |
| if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < |
| IPV6_ADDR_SCOPE_LINKLOCAL) |
| return; |
| |
| 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_del(dev, buf); |
| } |
| |
| spin_unlock_bh(&mc->mca_lock); |
| if (mc->mca_flags & MAF_NOREPORT) |
| return; |
| |
| if (!mc->idev->dead) |
| igmp6_leave_group(mc); |
| |
| spin_lock_bh(&mc->mca_lock); |
| if (del_timer(&mc->mca_timer)) |
| refcount_dec(&mc->mca_refcnt); |
| 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); |
| |
| spin_lock_bh(&idev->mc_lock); |
| pmc->next = idev->mc_tomb; |
| idev->mc_tomb = pmc; |
| spin_unlock_bh(&idev->mc_lock); |
| } |
| |
| static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im) |
| { |
| struct ifmcaddr6 *pmc, *pmc_prev; |
| struct ip6_sf_list *psf; |
| struct in6_addr *pmca = &im->mca_addr; |
| |
| spin_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; |
| } |
| spin_unlock_bh(&idev->mc_lock); |
| |
| spin_lock_bh(&im->mca_lock); |
| if (pmc) { |
| im->idev = pmc->idev; |
| if (im->mca_sfmode == MCAST_INCLUDE) { |
| swap(im->mca_tomb, pmc->mca_tomb); |
| swap(im->mca_sources, pmc->mca_sources); |
| for (psf = im->mca_sources; psf; psf = psf->sf_next) |
| psf->sf_crcount = idev->mc_qrv; |
| } else { |
| im->mca_crcount = idev->mc_qrv; |
| } |
| in6_dev_put(pmc->idev); |
| ip6_mc_clear_src(pmc); |
| kfree(pmc); |
| } |
| spin_unlock_bh(&im->mca_lock); |
| } |
| |
| static void mld_clear_delrec(struct inet6_dev *idev) |
| { |
| struct ifmcaddr6 *pmc, *nextpmc; |
| |
| spin_lock_bh(&idev->mc_lock); |
| pmc = idev->mc_tomb; |
| idev->mc_tomb = NULL; |
| spin_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); |
| } |
| |
| static void mca_get(struct ifmcaddr6 *mc) |
| { |
| refcount_inc(&mc->mca_refcnt); |
| } |
| |
| static void ma_put(struct ifmcaddr6 *mc) |
| { |
| if (refcount_dec_and_test(&mc->mca_refcnt)) { |
| in6_dev_put(mc->idev); |
| kfree(mc); |
| } |
| } |
| |
| static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev, |
| const struct in6_addr *addr, |
| unsigned int mode) |
| { |
| struct ifmcaddr6 *mc; |
| |
| mc = kzalloc(sizeof(*mc), GFP_ATOMIC); |
| if (!mc) |
| return NULL; |
| |
| timer_setup(&mc->mca_timer, igmp6_timer_handler, 0); |
| |
| mc->mca_addr = *addr; |
| mc->idev = idev; /* reference taken by caller */ |
| mc->mca_users = 1; |
| /* mca_stamp should be updated upon changes */ |
| mc->mca_cstamp = mc->mca_tstamp = jiffies; |
| refcount_set(&mc->mca_refcnt, 1); |
| spin_lock_init(&mc->mca_lock); |
| |
| mc->mca_sfmode = mode; |
| mc->mca_sfcount[mode] = 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; |
| |
| return mc; |
| } |
| |
| /* |
| * device multicast group inc (add if not found) |
| */ |
| static int __ipv6_dev_mc_inc(struct net_device *dev, |
| const struct in6_addr *addr, unsigned int mode) |
| { |
| struct ifmcaddr6 *mc; |
| struct inet6_dev *idev; |
| |
| ASSERT_RTNL(); |
| |
| /* we need to take a reference on idev */ |
| idev = in6_dev_get(dev); |
| |
| if (!idev) |
| 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, mode, 0, NULL, 0); |
| in6_dev_put(idev); |
| return 0; |
| } |
| } |
| |
| mc = mca_alloc(idev, addr, mode); |
| if (!mc) { |
| write_unlock_bh(&idev->lock); |
| in6_dev_put(idev); |
| return -ENOMEM; |
| } |
| |
| mc->next = idev->mc_list; |
| idev->mc_list = mc; |
| |
| /* Hold this for the code below before we unlock, |
| * it is already exposed via idev->mc_list. |
| */ |
| mca_get(mc); |
| write_unlock_bh(&idev->lock); |
| |
| mld_del_delrec(idev, mc); |
| igmp6_group_added(mc); |
| ma_put(mc); |
| return 0; |
| } |
| |
| int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr) |
| { |
| return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE); |
| } |
| EXPORT_SYMBOL(ipv6_dev_mc_inc); |
| |
| /* |
| * device multicast group del |
| */ |
| int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr) |
| { |
| struct ifmcaddr6 *ma, **map; |
| |
| ASSERT_RTNL(); |
| |
| 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); |
| ip6_mc_clear_src(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, const struct in6_addr *addr) |
| { |
| struct inet6_dev *idev; |
| int err; |
| |
| ASSERT_RTNL(); |
| |
| idev = __in6_dev_get(dev); |
| if (!idev) |
| err = -ENODEV; |
| else |
| err = __ipv6_dev_mc_dec(idev, addr); |
| |
| return err; |
| } |
| EXPORT_SYMBOL(ipv6_dev_mc_dec); |
| |
| /* |
| * check if the interface/address pair is valid |
| */ |
| bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group, |
| const struct in6_addr *src_addr) |
| { |
| struct inet6_dev *idev; |
| struct ifmcaddr6 *mc; |
| bool rv = false; |
| |
| rcu_read_lock(); |
| 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 = true; /* don't filter unspecified source */ |
| } |
| read_unlock_bh(&idev->lock); |
| } |
| rcu_read_unlock(); |
| return rv; |
| } |
| |
| static void mld_gq_start_timer(struct inet6_dev *idev) |
| { |
| unsigned long tv = prandom_u32() % 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_gq_stop_timer(struct inet6_dev *idev) |
| { |
| idev->mc_gq_running = 0; |
| if (del_timer(&idev->mc_gq_timer)) |
| __in6_dev_put(idev); |
| } |
| |
| static void mld_ifc_start_timer(struct inet6_dev *idev, unsigned long delay) |
| { |
| unsigned long tv = prandom_u32() % delay; |
| |
| if (!mod_timer(&idev->mc_ifc_timer, jiffies+tv+2)) |
| in6_dev_hold(idev); |
| } |
| |
| static void mld_ifc_stop_timer(struct inet6_dev *idev) |
| { |
| idev->mc_ifc_count = 0; |
| if (del_timer(&idev->mc_ifc_timer)) |
| __in6_dev_put(idev); |
| } |
| |
| static void mld_dad_start_timer(struct inet6_dev *idev, unsigned long delay) |
| { |
| unsigned long tv = prandom_u32() % delay; |
| |
| if (!mod_timer(&idev->mc_dad_timer, jiffies+tv+2)) |
| in6_dev_hold(idev); |
| } |
| |
| static void mld_dad_stop_timer(struct inet6_dev *idev) |
| { |
| if (del_timer(&idev->mc_dad_timer)) |
| __in6_dev_put(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)) { |
| refcount_dec(&ma->mca_refcnt); |
| delay = ma->mca_timer.expires - jiffies; |
| } |
| |
| if (delay >= resptime) |
| delay = prandom_u32() % resptime; |
| |
| ma->mca_timer.expires = jiffies + delay; |
| if (!mod_timer(&ma->mca_timer, jiffies + delay)) |
| refcount_inc(&ma->mca_refcnt); |
| ma->mca_flags |= MAF_TIMER_RUNNING; |
| } |
| |
| /* mark EXCLUDE-mode sources */ |
| static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs, |
| const 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 (psf->sf_count[MCAST_INCLUDE] || |
| pmc->mca_sfcount[MCAST_EXCLUDE] != |
| psf->sf_count[MCAST_EXCLUDE]) |
| break; |
| if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) { |
| scount++; |
| break; |
| } |
| } |
| } |
| pmc->mca_flags &= ~MAF_GSQUERY; |
| if (scount == nsrcs) /* all sources excluded */ |
| return false; |
| return true; |
| } |
| |
| static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs, |
| const 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 false; |
| } |
| pmc->mca_flags |= MAF_GSQUERY; |
| return true; |
| } |
| |
| static int mld_force_mld_version(const struct inet6_dev *idev) |
| { |
| /* Normally, both are 0 here. If enforcement to a particular is |
| * being used, individual device enforcement will have a lower |
| * precedence over 'all' device (.../conf/all/force_mld_version). |
| */ |
| |
| if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0) |
| return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version; |
| else |
| return idev->cnf.force_mld_version; |
| } |
| |
| static bool mld_in_v2_mode_only(const struct inet6_dev *idev) |
| { |
| return mld_force_mld_version(idev) == 2; |
| } |
| |
| static bool mld_in_v1_mode_only(const struct inet6_dev *idev) |
| { |
| return mld_force_mld_version(idev) == 1; |
| } |
| |
| static bool mld_in_v1_mode(const struct inet6_dev *idev) |
| { |
| if (mld_in_v2_mode_only(idev)) |
| return false; |
| if (mld_in_v1_mode_only(idev)) |
| return true; |
| if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen)) |
| return true; |
| |
| return false; |
| } |
| |
| static void mld_set_v1_mode(struct inet6_dev *idev) |
| { |
| /* RFC3810, relevant sections: |
| * - 9.1. Robustness Variable |
| * - 9.2. Query Interval |
| * - 9.3. Query Response Interval |
| * - 9.12. Older Version Querier Present Timeout |
| */ |
| unsigned long switchback; |
| |
| switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri; |
| |
| idev->mc_v1_seen = jiffies + switchback; |
| } |
| |
| static void mld_update_qrv(struct inet6_dev *idev, |
| const struct mld2_query *mlh2) |
| { |
| /* RFC3810, relevant sections: |
| * - 5.1.8. QRV (Querier's Robustness Variable) |
| * - 9.1. Robustness Variable |
| */ |
| |
| /* The value of the Robustness Variable MUST NOT be zero, |
| * and SHOULD NOT be one. Catch this here if we ever run |
| * into such a case in future. |
| */ |
| const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv); |
| WARN_ON(idev->mc_qrv == 0); |
| |
| if (mlh2->mld2q_qrv > 0) |
| idev->mc_qrv = mlh2->mld2q_qrv; |
| |
| if (unlikely(idev->mc_qrv < min_qrv)) { |
| net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n", |
| idev->mc_qrv, min_qrv); |
| idev->mc_qrv = min_qrv; |
| } |
| } |
| |
| static void mld_update_qi(struct inet6_dev *idev, |
| const struct mld2_query *mlh2) |
| { |
| /* RFC3810, relevant sections: |
| * - 5.1.9. QQIC (Querier's Query Interval Code) |
| * - 9.2. Query Interval |
| * - 9.12. Older Version Querier Present Timeout |
| * (the [Query Interval] in the last Query received) |
| */ |
| unsigned long mc_qqi; |
| |
| if (mlh2->mld2q_qqic < 128) { |
| mc_qqi = mlh2->mld2q_qqic; |
| } else { |
| unsigned long mc_man, mc_exp; |
| |
| mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic); |
| mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic); |
| |
| mc_qqi = (mc_man | 0x10) << (mc_exp + 3); |
| } |
| |
| idev->mc_qi = mc_qqi * HZ; |
| } |
| |
| static void mld_update_qri(struct inet6_dev *idev, |
| const struct mld2_query *mlh2) |
| { |
| /* RFC3810, relevant sections: |
| * - 5.1.3. Maximum Response Code |
| * - 9.3. Query Response Interval |
| */ |
| idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2)); |
| } |
| |
| static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld, |
| unsigned long *max_delay, bool v1_query) |
| { |
| unsigned long mldv1_md; |
| |
| /* Ignore v1 queries */ |
| if (mld_in_v2_mode_only(idev)) |
| return -EINVAL; |
| |
| mldv1_md = ntohs(mld->mld_maxdelay); |
| |
| /* When in MLDv1 fallback and a MLDv2 router start-up being |
| * unaware of current MLDv1 operation, the MRC == MRD mapping |
| * only works when the exponential algorithm is not being |
| * used (as MLDv1 is unaware of such things). |
| * |
| * According to the RFC author, the MLDv2 implementations |
| * he's aware of all use a MRC < 32768 on start up queries. |
| * |
| * Thus, should we *ever* encounter something else larger |
| * than that, just assume the maximum possible within our |
| * reach. |
| */ |
| if (!v1_query) |
| mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT); |
| |
| *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL); |
| |
| /* MLDv1 router present: we need to go into v1 mode *only* |
| * when an MLDv1 query is received as per section 9.12. of |
| * RFC3810! And we know from RFC2710 section 3.7 that MLDv1 |
| * queries MUST be of exactly 24 octets. |
| */ |
| if (v1_query) |
| mld_set_v1_mode(idev); |
| |
| /* cancel MLDv2 report timer */ |
| mld_gq_stop_timer(idev); |
| /* cancel the interface change timer */ |
| mld_ifc_stop_timer(idev); |
| /* clear deleted report items */ |
| mld_clear_delrec(idev); |
| |
| return 0; |
| } |
| |
| static int mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld, |
| unsigned long *max_delay) |
| { |
| *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL); |
| |
| mld_update_qrv(idev, mld); |
| mld_update_qi(idev, mld); |
| mld_update_qri(idev, mld); |
| |
| idev->mc_maxdelay = *max_delay; |
| |
| return 0; |
| } |
| |
| /* called with rcu_read_lock() */ |
| int igmp6_event_query(struct sk_buff *skb) |
| { |
| struct mld2_query *mlh2 = NULL; |
| struct ifmcaddr6 *ma; |
| const struct in6_addr *group; |
| unsigned long max_delay; |
| struct inet6_dev *idev; |
| struct mld_msg *mld; |
| int group_type; |
| int mark = 0; |
| int len, err; |
| |
| 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); |
| |
| /* RFC3810 6.2 |
| * Upon reception of an MLD message that contains a Query, the node |
| * checks if the source address of the message is a valid link-local |
| * address, if the Hop Limit is set to 1, and if the Router Alert |
| * option is present in the Hop-By-Hop Options header of the IPv6 |
| * packet. If any of these checks fails, the packet is dropped. |
| */ |
| if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) || |
| ipv6_hdr(skb)->hop_limit != 1 || |
| !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) || |
| IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD)) |
| return -EINVAL; |
| |
| idev = __in6_dev_get(skb->dev); |
| if (!idev) |
| return 0; |
| |
| mld = (struct mld_msg *)icmp6_hdr(skb); |
| group = &mld->mld_mca; |
| group_type = ipv6_addr_type(group); |
| |
| if (group_type != IPV6_ADDR_ANY && |
| !(group_type&IPV6_ADDR_MULTICAST)) |
| return -EINVAL; |
| |
| if (len < MLD_V1_QUERY_LEN) { |
| return -EINVAL; |
| } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) { |
| err = mld_process_v1(idev, mld, &max_delay, |
| len == MLD_V1_QUERY_LEN); |
| if (err < 0) |
| return err; |
| } else if (len >= MLD_V2_QUERY_LEN_MIN) { |
| int srcs_offset = sizeof(struct mld2_query) - |
| sizeof(struct icmp6hdr); |
| |
| if (!pskb_may_pull(skb, srcs_offset)) |
| return -EINVAL; |
| |
| mlh2 = (struct mld2_query *)skb_transport_header(skb); |
| |
| err = mld_process_v2(idev, mlh2, &max_delay); |
| if (err < 0) |
| return err; |
| |
| if (group_type == IPV6_ADDR_ANY) { /* general query */ |
| if (mlh2->mld2q_nsrcs) |
| return -EINVAL; /* no sources allowed */ |
| |
| mld_gq_start_timer(idev); |
| return 0; |
| } |
| /* mark sources to include, if group & source-specific */ |
| if (mlh2->mld2q_nsrcs != 0) { |
| if (!pskb_may_pull(skb, srcs_offset + |
| ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr))) |
| return -EINVAL; |
| |
| mlh2 = (struct mld2_query *)skb_transport_header(skb); |
| mark = 1; |
| } |
| } else { |
| 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->mld2q_nsrcs), mlh2->mld2q_srcs)) |
| igmp6_group_queried(ma, max_delay); |
| spin_unlock_bh(&ma->mca_lock); |
| break; |
| } |
| } |
| read_unlock_bh(&idev->lock); |
| |
| return 0; |
| } |
| |
| /* called with rcu_read_lock() */ |
| int igmp6_event_report(struct sk_buff *skb) |
| { |
| struct ifmcaddr6 *ma; |
| struct inet6_dev *idev; |
| struct mld_msg *mld; |
| 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(*mld) - sizeof(struct icmp6hdr))) |
| return -EINVAL; |
| |
| mld = (struct mld_msg *)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; |
| |
| idev = __in6_dev_get(skb->dev); |
| if (!idev) |
| 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, &mld->mld_mca)) { |
| spin_lock(&ma->mca_lock); |
| if (del_timer(&ma->mca_timer)) |
| refcount_dec(&ma->mca_refcnt); |
| ma->mca_flags &= ~(MAF_LAST_REPORTER|MAF_TIMER_RUNNING); |
| spin_unlock(&ma->mca_lock); |
| break; |
| } |
| } |
| read_unlock_bh(&idev->lock); |
| return 0; |
| } |
| |
| static bool 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 false; |
| if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) { |
| if (pmc->mca_sfmode == MCAST_INCLUDE) |
| return true; |
| /* 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 false; |
| case MLD2_CHANGE_TO_INCLUDE: |
| if (gdeleted || sdeleted) |
| return false; |
| return psf->sf_count[MCAST_INCLUDE] != 0; |
| case MLD2_CHANGE_TO_EXCLUDE: |
| if (gdeleted || sdeleted) |
| return false; |
| if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 || |
| psf->sf_count[MCAST_INCLUDE]) |
| return false; |
| return pmc->mca_sfcount[MCAST_EXCLUDE] == |
| psf->sf_count[MCAST_EXCLUDE]; |
| case MLD2_ALLOW_NEW_SOURCES: |
| if (gdeleted || !psf->sf_crcount) |
| return false; |
| 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 false; |
| } |
| |
| 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 void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb, |
| struct net_device *dev, |
| const struct in6_addr *saddr, |
| const struct in6_addr *daddr, |
| int proto, int len) |
| { |
| struct ipv6hdr *hdr; |
| |
| skb->protocol = htons(ETH_P_IPV6); |
| skb->dev = dev; |
| |
| skb_reset_network_header(skb); |
| skb_put(skb, sizeof(struct ipv6hdr)); |
| hdr = ipv6_hdr(skb); |
| |
| ip6_flow_hdr(hdr, 0, 0); |
| |
| hdr->payload_len = htons(len); |
| hdr->nexthdr = proto; |
| hdr->hop_limit = inet6_sk(sk)->hop_limit; |
| |
| hdr->saddr = *saddr; |
| hdr->daddr = *daddr; |
| } |
| |
| static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu) |
| { |
| struct net_device *dev = idev->dev; |
| struct net *net = dev_net(dev); |
| struct sock *sk = net->ipv6.igmp_sk; |
| struct sk_buff *skb; |
| struct mld2_report *pmr; |
| struct in6_addr addr_buf; |
| const struct in6_addr *saddr; |
| int hlen = LL_RESERVED_SPACE(dev); |
| int tlen = dev->needed_tailroom; |
| unsigned int size = mtu + hlen + tlen; |
| int err; |
| u8 ra[8] = { IPPROTO_ICMPV6, 0, |
| IPV6_TLV_ROUTERALERT, 2, 0, 0, |
| IPV6_TLV_PADN, 0 }; |
| |
| /* we assume size > sizeof(ra) here */ |
| /* limit our allocations to order-0 page */ |
| size = min_t(int, size, SKB_MAX_ORDER(0, 0)); |
| skb = sock_alloc_send_skb(sk, size, 1, &err); |
| |
| if (!skb) |
| return NULL; |
| |
| skb->priority = TC_PRIO_CONTROL; |
| skb_reserve(skb, hlen); |
| skb_tailroom_reserve(skb, mtu, tlen); |
| |
| if (__ipv6_get_lladdr(idev, &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. |
| */ |
| saddr = &in6addr_any; |
| } else |
| saddr = &addr_buf; |
| |
| ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0); |
| |
| skb_put_data(skb, 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->mld2r_type = ICMPV6_MLD2_REPORT; |
| pmr->mld2r_resv1 = 0; |
| pmr->mld2r_cksum = 0; |
| pmr->mld2r_resv2 = 0; |
| pmr->mld2r_ngrec = 0; |
| return skb; |
| } |
| |
| 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; |
| struct net *net = dev_net(skb->dev); |
| int err; |
| struct flowi6 fl6; |
| struct dst_entry *dst; |
| |
| rcu_read_lock(); |
| idev = __in6_dev_get(skb->dev); |
| IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len); |
| |
| payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) - |
| sizeof(*pip6); |
| mldlen = skb_tail_pointer(skb) - skb_transport_header(skb); |
| pip6->payload_len = htons(payload_len); |
| |
| pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen, |
| IPPROTO_ICMPV6, |
| csum_partial(skb_transport_header(skb), |
| mldlen, 0)); |
| |
| icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT, |
| &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
| skb->dev->ifindex); |
| dst = icmp6_dst_alloc(skb->dev, &fl6); |
| |
| err = 0; |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| dst = NULL; |
| } |
| skb_dst_set(skb, dst); |
| if (err) |
| goto err_out; |
| |
| err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
| net, net->ipv6.igmp_sk, skb, NULL, skb->dev, |
| dst_output); |
| out: |
| if (!err) { |
| ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT); |
| ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
| } else { |
| IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
| } |
| |
| rcu_read_unlock(); |
| return; |
| |
| err_out: |
| kfree_skb(skb); |
| goto out; |
| } |
| |
| 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, unsigned int mtu) |
| { |
| struct mld2_report *pmr; |
| struct mld2_grec *pgr; |
| |
| if (!skb) { |
| skb = mld_newpack(pmc->idev, mtu); |
| if (!skb) |
| return NULL; |
| } |
| pgr = 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->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1); |
| *ppgr = pgr; |
| return skb; |
| } |
| |
| #define AVAILABLE(skb) ((skb) ? skb_availroom(skb) : 0) |
| |
| static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc, |
| int type, int gdeleted, int sdeleted, int crsend) |
| { |
| struct inet6_dev *idev = pmc->idev; |
| struct net_device *dev = 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; |
| unsigned int mtu; |
| |
| if (pmc->mca_flags & MAF_NOREPORT) |
| return skb; |
| |
| mtu = READ_ONCE(dev->mtu); |
| if (mtu < IPV6_MIN_MTU) |
| 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->mld2r_ngrec && |
| AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) { |
| if (skb) |
| mld_sendpack(skb); |
| skb = mld_newpack(idev, 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) && !crsend) { |
| psf_prev = psf; |
| continue; |
| } |
| |
| /* Based on RFC3810 6.1. Should not send source-list change |
| * records when there is a filter mode change. |
| */ |
| if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) || |
| (!gdeleted && pmc->mca_crcount)) && |
| (type == MLD2_ALLOW_NEW_SOURCES || |
| type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) |
| goto decrease_sf_crcount; |
| |
| /* 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(idev, mtu); |
| first = 1; |
| scount = 0; |
| } |
| if (first) { |
| skb = add_grhead(skb, pmc, type, &pgr, mtu); |
| first = 0; |
| } |
| if (!skb) |
| return NULL; |
| psrc = 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) { |
| decrease_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 || crsend) { |
| /* 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, mtu); |
| } |
| } |
| 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; |
| |
| read_lock_bh(&idev->lock); |
| if (!pmc) { |
| 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, 0); |
| spin_unlock_bh(&pmc->mca_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, 0); |
| spin_unlock_bh(&pmc->mca_lock); |
| } |
| read_unlock_bh(&idev->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); |
| spin_lock(&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, 0); |
| skb = add_grec(skb, pmc, dtype, 1, 1, 0); |
| } |
| if (pmc->mca_crcount) { |
| if (pmc->mca_sfmode == MCAST_EXCLUDE) { |
| type = MLD2_CHANGE_TO_INCLUDE; |
| skb = add_grec(skb, pmc, type, 1, 0, 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; |
| } |
| spin_unlock(&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, 0); |
| skb = add_grec(skb, pmc, dtype, 0, 1, 0); /* 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, 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 net *net = dev_net(dev); |
| struct sock *sk = net->ipv6.igmp_sk; |
| struct inet6_dev *idev; |
| struct sk_buff *skb; |
| struct mld_msg *hdr; |
| const struct in6_addr *snd_addr, *saddr; |
| struct in6_addr addr_buf; |
| int hlen = LL_RESERVED_SPACE(dev); |
| int tlen = dev->needed_tailroom; |
| int err, len, payload_len, full_len; |
| u8 ra[8] = { IPPROTO_ICMPV6, 0, |
| IPV6_TLV_ROUTERALERT, 2, 0, 0, |
| IPV6_TLV_PADN, 0 }; |
| struct flowi6 fl6; |
| struct dst_entry *dst; |
| |
| if (type == ICMPV6_MGM_REDUCTION) |
| snd_addr = &in6addr_linklocal_allrouters; |
| else |
| snd_addr = addr; |
| |
| len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr); |
| payload_len = len + sizeof(ra); |
| full_len = sizeof(struct ipv6hdr) + payload_len; |
| |
| rcu_read_lock(); |
| IP6_UPD_PO_STATS(net, __in6_dev_get(dev), |
| IPSTATS_MIB_OUT, full_len); |
| rcu_read_unlock(); |
| |
| skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err); |
| |
| if (!skb) { |
| rcu_read_lock(); |
| IP6_INC_STATS(net, __in6_dev_get(dev), |
| IPSTATS_MIB_OUTDISCARDS); |
| rcu_read_unlock(); |
| return; |
| } |
| skb->priority = TC_PRIO_CONTROL; |
| skb_reserve(skb, hlen); |
| |
| 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. |
| */ |
| saddr = &in6addr_any; |
| } else |
| saddr = &addr_buf; |
| |
| ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len); |
| |
| skb_put_data(skb, ra, sizeof(ra)); |
| |
| hdr = skb_put_zero(skb, sizeof(struct mld_msg)); |
| hdr->mld_type = type; |
| hdr->mld_mca = *addr; |
| |
| hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len, |
| IPPROTO_ICMPV6, |
| csum_partial(hdr, len, 0)); |
| |
| rcu_read_lock(); |
| idev = __in6_dev_get(skb->dev); |
| |
| icmpv6_flow_init(sk, &fl6, type, |
| &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
| skb->dev->ifindex); |
| dst = icmp6_dst_alloc(skb->dev, &fl6); |
| if (IS_ERR(dst)) { |
| err = PTR_ERR(dst); |
| goto err_out; |
| } |
| |
| skb_dst_set(skb, dst); |
| err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, |
| net, sk, skb, NULL, skb->dev, |
| dst_output); |
| out: |
| if (!err) { |
| ICMP6MSGOUT_INC_STATS(net, idev, type); |
| ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS); |
| } else |
| IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS); |
| |
| rcu_read_unlock(); |
| return; |
| |
| err_out: |
| kfree_skb(skb); |
| goto out; |
| } |
| |
| static void mld_send_initial_cr(struct inet6_dev *idev) |
| { |
| struct sk_buff *skb; |
| struct ifmcaddr6 *pmc; |
| int type; |
| |
| if (mld_in_v1_mode(idev)) |
| return; |
| |
| skb = NULL; |
| read_lock_bh(&idev->lock); |
| for (pmc = idev->mc_list; pmc; pmc = pmc->next) { |
| spin_lock_bh(&pmc->mca_lock); |
| if (pmc->mca_sfcount[MCAST_EXCLUDE]) |
| type = MLD2_CHANGE_TO_EXCLUDE; |
| else |
| type = MLD2_ALLOW_NEW_SOURCES; |
| skb = add_grec(skb, pmc, type, 0, 0, 1); |
| spin_unlock_bh(&pmc->mca_lock); |
| } |
| read_unlock_bh(&idev->lock); |
| if (skb) |
| mld_sendpack(skb); |
| } |
| |
| void ipv6_mc_dad_complete(struct inet6_dev *idev) |
| { |
| idev->mc_dad_count = idev->mc_qrv; |
| if (idev->mc_dad_count) { |
| mld_send_initial_cr(idev); |
| idev->mc_dad_count--; |
| if (idev->mc_dad_count) |
| mld_dad_start_timer(idev, |
| unsolicited_report_interval(idev)); |
| } |
| } |
| |
| static void mld_dad_timer_expire(struct timer_list *t) |
| { |
| struct inet6_dev *idev = from_timer(idev, t, mc_dad_timer); |
| |
| mld_send_initial_cr(idev); |
| if (idev->mc_dad_count) { |
| idev->mc_dad_count--; |
| if (idev->mc_dad_count) |
| mld_dad_start_timer(idev, |
| unsolicited_report_interval(idev)); |
| } |
| in6_dev_put(idev); |
| } |
| |
| static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode, |
| const 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_in_v1_mode(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, const struct in6_addr *pmca, |
| int sfmode, int sfcount, const 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, |
| const struct in6_addr *psfsrc) |
| { |
| 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 = 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, const struct in6_addr *pmca, |
| int sfmode, int sfcount, const 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]); |
| if (err) |
| break; |
| } |
| if (err) { |
| int j; |
| |
| if (!delta) |
| pmc->mca_sfcount[sfmode]--; |
| for (j = 0; j < i; j++) |
| ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]); |
| } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) { |
| 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 = prandom_u32() % unsolicited_report_interval(ma->idev); |
| |
| spin_lock_bh(&ma->mca_lock); |
| if (del_timer(&ma->mca_timer)) { |
| refcount_dec(&ma->mca_refcnt); |
| delay = ma->mca_timer.expires - jiffies; |
| } |
| |
| if (!mod_timer(&ma->mca_timer, jiffies + delay)) |
| refcount_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; |
| |
| write_lock_bh(&iml->sflock); |
| if (!iml->sflist) { |
| /* any-source empty exclude case */ |
| err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0); |
| } else { |
| 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; |
| } |
| write_unlock_bh(&iml->sflock); |
| return err; |
| } |
| |
| static void igmp6_leave_group(struct ifmcaddr6 *ma) |
| { |
| if (mld_in_v1_mode(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(struct timer_list *t) |
| { |
| struct inet6_dev *idev = from_timer(idev, t, mc_gq_timer); |
| |
| idev->mc_gq_running = 0; |
| mld_send_report(idev, NULL); |
| in6_dev_put(idev); |
| } |
| |
| static void mld_ifc_timer_expire(struct timer_list *t) |
| { |
| struct inet6_dev *idev = from_timer(idev, t, mc_ifc_timer); |
| |
| mld_send_cr(idev); |
| if (idev->mc_ifc_count) { |
| idev->mc_ifc_count--; |
| if (idev->mc_ifc_count) |
| mld_ifc_start_timer(idev, |
| unsolicited_report_interval(idev)); |
| } |
| in6_dev_put(idev); |
| } |
| |
| static void mld_ifc_event(struct inet6_dev *idev) |
| { |
| if (mld_in_v1_mode(idev)) |
| return; |
| idev->mc_ifc_count = idev->mc_qrv; |
| mld_ifc_start_timer(idev, 1); |
| } |
| |
| static void igmp6_timer_handler(struct timer_list *t) |
| { |
| struct ifmcaddr6 *ma = from_timer(ma, t, mca_timer); |
| |
| if (mld_in_v1_mode(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 changing type */ |
| |
| void ipv6_mc_unmap(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_dropped(i); |
| read_unlock_bh(&idev->lock); |
| } |
| |
| void ipv6_mc_remap(struct inet6_dev *idev) |
| { |
| ipv6_mc_up(idev); |
| } |
| |
| /* Device going down */ |
| |
| void ipv6_mc_down(struct inet6_dev *idev) |
| { |
| struct ifmcaddr6 *i; |
| |
| /* Withdraw multicast list */ |
| |
| read_lock_bh(&idev->lock); |
| |
| for (i = idev->mc_list; i; i = i->next) |
| igmp6_group_dropped(i); |
| |
| /* Should stop timer after group drop. or we will |
| * start timer again in mld_ifc_event() |
| */ |
| mld_ifc_stop_timer(idev); |
| mld_gq_stop_timer(idev); |
| mld_dad_stop_timer(idev); |
| read_unlock_bh(&idev->lock); |
| } |
| |
| static void ipv6_mc_reset(struct inet6_dev *idev) |
| { |
| idev->mc_qrv = sysctl_mld_qrv; |
| idev->mc_qi = MLD_QI_DEFAULT; |
| idev->mc_qri = MLD_QRI_DEFAULT; |
| idev->mc_v1_seen = 0; |
| idev->mc_maxdelay = unsolicited_report_interval(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); |
| ipv6_mc_reset(idev); |
| for (i = idev->mc_list; i; i = i->next) { |
| mld_del_delrec(idev, i); |
| 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); |
| spin_lock_init(&idev->mc_lock); |
| idev->mc_gq_running = 0; |
| timer_setup(&idev->mc_gq_timer, mld_gq_timer_expire, 0); |
| idev->mc_tomb = NULL; |
| idev->mc_ifc_count = 0; |
| timer_setup(&idev->mc_ifc_timer, mld_ifc_timer_expire, 0); |
| timer_setup(&idev->mc_dad_timer, mld_dad_timer_expire, 0); |
| ipv6_mc_reset(idev); |
| 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; |
| |
| /* Deactivate timers */ |
| ipv6_mc_down(idev); |
| mld_clear_delrec(idev); |
| |
| /* Delete all-nodes address. */ |
| /* 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, &in6addr_linklocal_allnodes); |
| |
| if (idev->cnf.forwarding) |
| __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters); |
| |
| write_lock_bh(&idev->lock); |
| while ((i = idev->mc_list) != NULL) { |
| idev->mc_list = i->next; |
| |
| write_unlock_bh(&idev->lock); |
| ma_put(i); |
| write_lock_bh(&idev->lock); |
| } |
| write_unlock_bh(&idev->lock); |
| } |
| |
| static void ipv6_mc_rejoin_groups(struct inet6_dev *idev) |
| { |
| struct ifmcaddr6 *pmc; |
| |
| ASSERT_RTNL(); |
| |
| if (mld_in_v1_mode(idev)) { |
| read_lock_bh(&idev->lock); |
| for (pmc = idev->mc_list; pmc; pmc = pmc->next) |
| igmp6_join_group(pmc); |
| read_unlock_bh(&idev->lock); |
| } else |
| mld_send_report(idev, NULL); |
| } |
| |
| static int ipv6_mc_netdev_event(struct notifier_block *this, |
| unsigned long event, |
| void *ptr) |
| { |
| struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
| struct inet6_dev *idev = __in6_dev_get(dev); |
| |
| switch (event) { |
| case NETDEV_RESEND_IGMP: |
| if (idev) |
| ipv6_mc_rejoin_groups(idev); |
| break; |
| default: |
| break; |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block igmp6_netdev_notifier = { |
| .notifier_call = ipv6_mc_netdev_event, |
| }; |
| |
| #ifdef CONFIG_PROC_FS |
| struct igmp6_mc_iter_state { |
| struct seq_net_private p; |
| 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); |
| struct net *net = seq_file_net(seq); |
| |
| state->idev = NULL; |
| for_each_netdev_rcu(net, 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); |
| } |
| 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)) |
| read_unlock_bh(&state->idev->lock); |
| |
| state->dev = next_net_device_rcu(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) |
| __acquires(RCU) |
| { |
| rcu_read_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 = igmp6_mc_get_next(seq, v); |
| |
| ++*pos; |
| return im; |
| } |
| |
| static void igmp6_mc_seq_stop(struct seq_file *seq, void *v) |
| __releases(RCU) |
| { |
| struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq); |
| |
| if (likely(state->idev)) { |
| read_unlock_bh(&state->idev->lock); |
| state->idev = NULL; |
| } |
| state->dev = NULL; |
| rcu_read_unlock(); |
| } |
| |
| 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 %pi6 %5d %08X %ld\n", |
| state->dev->ifindex, state->dev->name, |
| &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, |
| }; |
| |
| struct igmp6_mcf_iter_state { |
| struct seq_net_private p; |
| 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); |
| struct net *net = seq_file_net(seq); |
| |
| state->idev = NULL; |
| state->im = NULL; |
| for_each_netdev_rcu(net, 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)) { |
| spin_lock_bh(&im->mca_lock); |
| psf = im->mca_sources; |
| if (likely(psf)) { |
| state->im = im; |
| state->idev = idev; |
| break; |
| } |
| spin_unlock_bh(&im->mca_lock); |
| } |
| read_unlock_bh(&idev->lock); |
| } |
| 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)) |
| read_unlock_bh(&state->idev->lock); |
| |
| state->dev = next_net_device_rcu(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) |
| __acquires(RCU) |
| { |
| rcu_read_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) |
| __releases(RCU) |
| { |
| struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq); |
| if (likely(state->im)) { |
| spin_unlock_bh(&state->im->mca_lock); |
| state->im = NULL; |
| } |
| if (likely(state->idev)) { |
| read_unlock_bh(&state->idev->lock); |
| state->idev = NULL; |
| } |
| state->dev = NULL; |
| rcu_read_unlock(); |
| } |
| |
| 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_puts(seq, "Idx Device Multicast Address Source Address INC EXC\n"); |
| } else { |
| seq_printf(seq, |
| "%3d %6.6s %pi6 %pi6 %6lu %6lu\n", |
| state->dev->ifindex, state->dev->name, |
| &state->im->mca_addr, |
| &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 __net_init igmp6_proc_init(struct net *net) |
| { |
| int err; |
| |
| err = -ENOMEM; |
| if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops, |
| sizeof(struct igmp6_mc_iter_state))) |
| goto out; |
| if (!proc_create_net("mcfilter6", 0444, net->proc_net, |
| &igmp6_mcf_seq_ops, |
| sizeof(struct igmp6_mcf_iter_state))) |
| goto out_proc_net_igmp6; |
| |
| err = 0; |
| out: |
| return err; |
| |
| out_proc_net_igmp6: |
| remove_proc_entry("igmp6", net->proc_net); |
| goto out; |
| } |
| |
| static void __net_exit igmp6_proc_exit(struct net *net) |
| { |
| remove_proc_entry("mcfilter6", net->proc_net); |
| remove_proc_entry("igmp6", net->proc_net); |
| } |
| #else |
| static inline int igmp6_proc_init(struct net *net) |
| { |
| return 0; |
| } |
| static inline void igmp6_proc_exit(struct net *net) |
| { |
| } |
| #endif |
| |
| |