net/ipv6/mcast.c

0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  *  Multicast support for IPv6
0004  *  Linux INET6 implementation
0005  *
0006  *  Authors:
0007  *  Pedro Roque     <roque@di.fc.ul.pt>
0008  *
0009  *  Based on linux/ipv4/igmp.c and linux/ipv4/ip_sockglue.c
0010  */
0011
0012 /* Changes:
0013  *
0014  *  yoshfuji    : fix format of router-alert option
0015  *  YOSHIFUJI Hideaki @USAGI:
0016  *      Fixed source address for MLD message based on
0017  *      <draft-ietf-magma-mld-source-05.txt>.
0018  *  YOSHIFUJI Hideaki @USAGI:
0019  *      - Ignore Queries for invalid addresses.
0020  *      - MLD for link-local addresses.
0021  *  David L Stevens <dlstevens@us.ibm.com>:
0022  *      - MLDv2 support
0023  */
0024
0025 #include <linux/module.h>
0026 #include <linux/errno.h>
0027 #include <linux/types.h>
0028 #include <linux/string.h>
0029 #include <linux/socket.h>
0030 #include <linux/sockios.h>
0031 #include <linux/jiffies.h>
0032 #include <linux/net.h>
0033 #include <linux/in.h>
0034 #include <linux/in6.h>
0035 #include <linux/netdevice.h>
0036 #include <linux/if_arp.h>
0037 #include <linux/route.h>
0038 #include <linux/init.h>
0039 #include <linux/proc_fs.h>
0040 #include <linux/seq_file.h>
0041 #include <linux/slab.h>
0042 #include <linux/pkt_sched.h>
0043 #include <net/mld.h>
0044 #include <linux/workqueue.h>
0045
0046 #include <linux/netfilter.h>
0047 #include <linux/netfilter_ipv6.h>
0048
0049 #include <net/net_namespace.h>
0050 #include <net/sock.h>
0051 #include <net/snmp.h>
0052
0053 #include <net/ipv6.h>
0054 #include <net/protocol.h>
0055 #include <net/if_inet6.h>
0056 #include <net/ndisc.h>
0057 #include <net/addrconf.h>
0058 #include <net/ip6_route.h>
0059 #include <net/inet_common.h>
0060
0061 #include <net/ip6_checksum.h>
0062
0063 /* Ensure that we have struct in6_addr aligned on 32bit word. */
0064 static int __mld2_query_bugs[] __attribute__((__unused__)) = {
0065     BUILD_BUG_ON_ZERO(offsetof(struct mld2_query, mld2q_srcs) % 4),
0066     BUILD_BUG_ON_ZERO(offsetof(struct mld2_report, mld2r_grec) % 4),
0067     BUILD_BUG_ON_ZERO(offsetof(struct mld2_grec, grec_mca) % 4)
0068 };
0069
0070 static struct workqueue_struct *mld_wq;
0071 static struct in6_addr mld2_all_mcr = MLD2_ALL_MCR_INIT;
0072
0073 static void igmp6_join_group(struct ifmcaddr6 *ma);
0074 static void igmp6_leave_group(struct ifmcaddr6 *ma);
0075 static void mld_mca_work(struct work_struct *work);
0076
0077 static void mld_ifc_event(struct inet6_dev *idev);
0078 static bool mld_in_v1_mode(const struct inet6_dev *idev);
0079 static int sf_setstate(struct ifmcaddr6 *pmc);
0080 static void sf_markstate(struct ifmcaddr6 *pmc);
0081 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc);
0082 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
0083               int sfmode, int sfcount, const struct in6_addr *psfsrc,
0084               int delta);
0085 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
0086               int sfmode, int sfcount, const struct in6_addr *psfsrc,
0087               int delta);
0088 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
0089                 struct inet6_dev *idev);
0090 static int __ipv6_dev_mc_inc(struct net_device *dev,
0091                  const struct in6_addr *addr, unsigned int mode);
0092
0093 #define MLD_QRV_DEFAULT     2
0094 /* RFC3810, 9.2. Query Interval */
0095 #define MLD_QI_DEFAULT      (125 * HZ)
0096 /* RFC3810, 9.3. Query Response Interval */
0097 #define MLD_QRI_DEFAULT     (10 * HZ)
0098
0099 /* RFC3810, 8.1 Query Version Distinctions */
0100 #define MLD_V1_QUERY_LEN    24
0101 #define MLD_V2_QUERY_LEN_MIN    28
0102
0103 #define IPV6_MLD_MAX_MSF    64
0104
0105 int sysctl_mld_max_msf __read_mostly = IPV6_MLD_MAX_MSF;
0106 int sysctl_mld_qrv __read_mostly = MLD_QRV_DEFAULT;
0107
0108 /*
0109  *  socket join on multicast group
0110  */
0111 #define mc_dereference(e, idev) \
0112     rcu_dereference_protected(e, lockdep_is_held(&(idev)->mc_lock))
0113
0114 #define sock_dereference(e, sk) \
0115     rcu_dereference_protected(e, lockdep_sock_is_held(sk))
0116
0117 #define for_each_pmc_socklock(np, sk, pmc)          \
0118     for (pmc = sock_dereference((np)->ipv6_mc_list, sk);    \
0119          pmc;                       \
0120          pmc = sock_dereference(pmc->next, sk))
0121
0122 #define for_each_pmc_rcu(np, pmc)               \
0123     for (pmc = rcu_dereference((np)->ipv6_mc_list);     \
0124          pmc;                       \
0125          pmc = rcu_dereference(pmc->next))
0126
0127 #define for_each_psf_mclock(mc, psf)                \
0128     for (psf = mc_dereference((mc)->mca_sources, mc->idev); \
0129          psf;                       \
0130          psf = mc_dereference(psf->sf_next, mc->idev))
0131
0132 #define for_each_psf_rcu(mc, psf)               \
0133     for (psf = rcu_dereference((mc)->mca_sources);      \
0134          psf;                       \
0135          psf = rcu_dereference(psf->sf_next))
0136
0137 #define for_each_psf_tomb(mc, psf)              \
0138     for (psf = mc_dereference((mc)->mca_tomb, mc->idev);    \
0139          psf;                       \
0140          psf = mc_dereference(psf->sf_next, mc->idev))
0141
0142 #define for_each_mc_mclock(idev, mc)                \
0143     for (mc = mc_dereference((idev)->mc_list, idev);    \
0144          mc;                        \
0145          mc = mc_dereference(mc->next, idev))
0146
0147 #define for_each_mc_rcu(idev, mc)               \
0148     for (mc = rcu_dereference((idev)->mc_list);             \
0149          mc;                                                \
0150          mc = rcu_dereference(mc->next))
0151
0152 #define for_each_mc_tomb(idev, mc)              \
0153     for (mc = mc_dereference((idev)->mc_tomb, idev);    \
0154          mc;                        \
0155          mc = mc_dereference(mc->next, idev))
0156
0157 static int unsolicited_report_interval(struct inet6_dev *idev)
0158 {
0159     int iv;
0160
0161     if (mld_in_v1_mode(idev))
0162         iv = idev->cnf.mldv1_unsolicited_report_interval;
0163     else
0164         iv = idev->cnf.mldv2_unsolicited_report_interval;
0165
0166     return iv > 0 ? iv : 1;
0167 }
0168
0169 static int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
0170                    const struct in6_addr *addr, unsigned int mode)
0171 {
0172     struct net_device *dev = NULL;
0173     struct ipv6_mc_socklist *mc_lst;
0174     struct ipv6_pinfo *np = inet6_sk(sk);
0175     struct net *net = sock_net(sk);
0176     int err;
0177
0178     ASSERT_RTNL();
0179
0180     if (!ipv6_addr_is_multicast(addr))
0181         return -EINVAL;
0182
0183     for_each_pmc_socklock(np, sk, mc_lst) {
0184         if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
0185             ipv6_addr_equal(&mc_lst->addr, addr))
0186             return -EADDRINUSE;
0187     }
0188
0189     mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
0190
0191     if (!mc_lst)
0192         return -ENOMEM;
0193
0194     mc_lst->next = NULL;
0195     mc_lst->addr = *addr;
0196
0197     if (ifindex == 0) {
0198         struct rt6_info *rt;
0199         rt = rt6_lookup(net, addr, NULL, 0, NULL, 0);
0200         if (rt) {
0201             dev = rt->dst.dev;
0202             ip6_rt_put(rt);
0203         }
0204     } else
0205         dev = __dev_get_by_index(net, ifindex);
0206
0207     if (!dev) {
0208         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
0209         return -ENODEV;
0210     }
0211
0212     mc_lst->ifindex = dev->ifindex;
0213     mc_lst->sfmode = mode;
0214     RCU_INIT_POINTER(mc_lst->sflist, NULL);
0215
0216     /*
0217      *  now add/increase the group membership on the device
0218      */
0219
0220     err = __ipv6_dev_mc_inc(dev, addr, mode);
0221
0222     if (err) {
0223         sock_kfree_s(sk, mc_lst, sizeof(*mc_lst));
0224         return err;
0225     }
0226
0227     mc_lst->next = np->ipv6_mc_list;
0228     rcu_assign_pointer(np->ipv6_mc_list, mc_lst);
0229
0230     return 0;
0231 }
0232
0233 int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
0234 {
0235     return __ipv6_sock_mc_join(sk, ifindex, addr, MCAST_EXCLUDE);
0236 }
0237 EXPORT_SYMBOL(ipv6_sock_mc_join);
0238
0239 int ipv6_sock_mc_join_ssm(struct sock *sk, int ifindex,
0240               const struct in6_addr *addr, unsigned int mode)
0241 {
0242     return __ipv6_sock_mc_join(sk, ifindex, addr, mode);
0243 }
0244
0245 /*
0246  *  socket leave on multicast group
0247  */
0248 int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
0249 {
0250     struct ipv6_pinfo *np = inet6_sk(sk);
0251     struct ipv6_mc_socklist *mc_lst;
0252     struct ipv6_mc_socklist __rcu **lnk;
0253     struct net *net = sock_net(sk);
0254
0255     ASSERT_RTNL();
0256
0257     if (!ipv6_addr_is_multicast(addr))
0258         return -EINVAL;
0259
0260     for (lnk = &np->ipv6_mc_list;
0261          (mc_lst = sock_dereference(*lnk, sk)) != NULL;
0262           lnk = &mc_lst->next) {
0263         if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
0264             ipv6_addr_equal(&mc_lst->addr, addr)) {
0265             struct net_device *dev;
0266
0267             *lnk = mc_lst->next;
0268
0269             dev = __dev_get_by_index(net, mc_lst->ifindex);
0270             if (dev) {
0271                 struct inet6_dev *idev = __in6_dev_get(dev);
0272
0273                 ip6_mc_leave_src(sk, mc_lst, idev);
0274                 if (idev)
0275                     __ipv6_dev_mc_dec(idev, &mc_lst->addr);
0276             } else {
0277                 ip6_mc_leave_src(sk, mc_lst, NULL);
0278             }
0279
0280             atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
0281             kfree_rcu(mc_lst, rcu);
0282             return 0;
0283         }
0284     }
0285
0286     return -EADDRNOTAVAIL;
0287 }
0288 EXPORT_SYMBOL(ipv6_sock_mc_drop);
0289
0290 static struct inet6_dev *ip6_mc_find_dev_rtnl(struct net *net,
0291                           const struct in6_addr *group,
0292                           int ifindex)
0293 {
0294     struct net_device *dev = NULL;
0295     struct inet6_dev *idev = NULL;
0296
0297     if (ifindex == 0) {
0298         struct rt6_info *rt = rt6_lookup(net, group, NULL, 0, NULL, 0);
0299
0300         if (rt) {
0301             dev = rt->dst.dev;
0302             ip6_rt_put(rt);
0303         }
0304     } else {
0305         dev = __dev_get_by_index(net, ifindex);
0306     }
0307
0308     if (!dev)
0309         return NULL;
0310     idev = __in6_dev_get(dev);
0311     if (!idev)
0312         return NULL;
0313     if (idev->dead)
0314         return NULL;
0315     return idev;
0316 }
0317
0318 void __ipv6_sock_mc_close(struct sock *sk)
0319 {
0320     struct ipv6_pinfo *np = inet6_sk(sk);
0321     struct ipv6_mc_socklist *mc_lst;
0322     struct net *net = sock_net(sk);
0323
0324     ASSERT_RTNL();
0325
0326     while ((mc_lst = sock_dereference(np->ipv6_mc_list, sk)) != NULL) {
0327         struct net_device *dev;
0328
0329         np->ipv6_mc_list = mc_lst->next;
0330
0331         dev = __dev_get_by_index(net, mc_lst->ifindex);
0332         if (dev) {
0333             struct inet6_dev *idev = __in6_dev_get(dev);
0334
0335             ip6_mc_leave_src(sk, mc_lst, idev);
0336             if (idev)
0337                 __ipv6_dev_mc_dec(idev, &mc_lst->addr);
0338         } else {
0339             ip6_mc_leave_src(sk, mc_lst, NULL);
0340         }
0341
0342         atomic_sub(sizeof(*mc_lst), &sk->sk_omem_alloc);
0343         kfree_rcu(mc_lst, rcu);
0344     }
0345 }
0346
0347 void ipv6_sock_mc_close(struct sock *sk)
0348 {
0349     struct ipv6_pinfo *np = inet6_sk(sk);
0350
0351     if (!rcu_access_pointer(np->ipv6_mc_list))
0352         return;
0353
0354     rtnl_lock();
0355     lock_sock(sk);
0356     __ipv6_sock_mc_close(sk);
0357     release_sock(sk);
0358     rtnl_unlock();
0359 }
0360
0361 int ip6_mc_source(int add, int omode, struct sock *sk,
0362     struct group_source_req *pgsr)
0363 {
0364     struct in6_addr *source, *group;
0365     struct ipv6_mc_socklist *pmc;
0366     struct inet6_dev *idev;
0367     struct ipv6_pinfo *inet6 = inet6_sk(sk);
0368     struct ip6_sf_socklist *psl;
0369     struct net *net = sock_net(sk);
0370     int i, j, rv;
0371     int leavegroup = 0;
0372     int err;
0373
0374     source = &((struct sockaddr_in6 *)&pgsr->gsr_source)->sin6_addr;
0375     group = &((struct sockaddr_in6 *)&pgsr->gsr_group)->sin6_addr;
0376
0377     if (!ipv6_addr_is_multicast(group))
0378         return -EINVAL;
0379
0380     idev = ip6_mc_find_dev_rtnl(net, group, pgsr->gsr_interface);
0381     if (!idev)
0382         return -ENODEV;
0383
0384     err = -EADDRNOTAVAIL;
0385
0386     mutex_lock(&idev->mc_lock);
0387     for_each_pmc_socklock(inet6, sk, pmc) {
0388         if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
0389             continue;
0390         if (ipv6_addr_equal(&pmc->addr, group))
0391             break;
0392     }
0393     if (!pmc) {     /* must have a prior join */
0394         err = -EINVAL;
0395         goto done;
0396     }
0397     /* if a source filter was set, must be the same mode as before */
0398     if (rcu_access_pointer(pmc->sflist)) {
0399         if (pmc->sfmode != omode) {
0400             err = -EINVAL;
0401             goto done;
0402         }
0403     } else if (pmc->sfmode != omode) {
0404         /* allow mode switches for empty-set filters */
0405         ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
0406         ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
0407         pmc->sfmode = omode;
0408     }
0409
0410     psl = sock_dereference(pmc->sflist, sk);
0411     if (!add) {
0412         if (!psl)
0413             goto done;  /* err = -EADDRNOTAVAIL */
0414         rv = !0;
0415         for (i = 0; i < psl->sl_count; i++) {
0416             rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
0417             if (rv == 0)
0418                 break;
0419         }
0420         if (rv)     /* source not found */
0421             goto done;  /* err = -EADDRNOTAVAIL */
0422
0423         /* special case - (INCLUDE, empty) == LEAVE_GROUP */
0424         if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
0425             leavegroup = 1;
0426             goto done;
0427         }
0428
0429         /* update the interface filter */
0430         ip6_mc_del_src(idev, group, omode, 1, source, 1);
0431
0432         for (j = i+1; j < psl->sl_count; j++)
0433             psl->sl_addr[j-1] = psl->sl_addr[j];
0434         psl->sl_count--;
0435         err = 0;
0436         goto done;
0437     }
0438     /* else, add a new source to the filter */
0439
0440     if (psl && psl->sl_count >= sysctl_mld_max_msf) {
0441         err = -ENOBUFS;
0442         goto done;
0443     }
0444     if (!psl || psl->sl_count == psl->sl_max) {
0445         struct ip6_sf_socklist *newpsl;
0446         int count = IP6_SFBLOCK;
0447
0448         if (psl)
0449             count += psl->sl_max;
0450         newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr, count),
0451                       GFP_KERNEL);
0452         if (!newpsl) {
0453             err = -ENOBUFS;
0454             goto done;
0455         }
0456         newpsl->sl_max = count;
0457         newpsl->sl_count = count - IP6_SFBLOCK;
0458         if (psl) {
0459             for (i = 0; i < psl->sl_count; i++)
0460                 newpsl->sl_addr[i] = psl->sl_addr[i];
0461             atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
0462                    &sk->sk_omem_alloc);
0463         }
0464         rcu_assign_pointer(pmc->sflist, newpsl);
0465         kfree_rcu(psl, rcu);
0466         psl = newpsl;
0467     }
0468     rv = 1; /* > 0 for insert logic below if sl_count is 0 */
0469     for (i = 0; i < psl->sl_count; i++) {
0470         rv = !ipv6_addr_equal(&psl->sl_addr[i], source);
0471         if (rv == 0) /* There is an error in the address. */
0472             goto done;
0473     }
0474     for (j = psl->sl_count-1; j >= i; j--)
0475         psl->sl_addr[j+1] = psl->sl_addr[j];
0476     psl->sl_addr[i] = *source;
0477     psl->sl_count++;
0478     err = 0;
0479     /* update the interface list */
0480     ip6_mc_add_src(idev, group, omode, 1, source, 1);
0481 done:
0482     mutex_unlock(&idev->mc_lock);
0483     if (leavegroup)
0484         err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
0485     return err;
0486 }
0487
0488 int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf,
0489             struct sockaddr_storage *list)
0490 {
0491     const struct in6_addr *group;
0492     struct ipv6_mc_socklist *pmc;
0493     struct inet6_dev *idev;
0494     struct ipv6_pinfo *inet6 = inet6_sk(sk);
0495     struct ip6_sf_socklist *newpsl, *psl;
0496     struct net *net = sock_net(sk);
0497     int leavegroup = 0;
0498     int i, err;
0499
0500     group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
0501
0502     if (!ipv6_addr_is_multicast(group))
0503         return -EINVAL;
0504     if (gsf->gf_fmode != MCAST_INCLUDE &&
0505         gsf->gf_fmode != MCAST_EXCLUDE)
0506         return -EINVAL;
0507
0508     idev = ip6_mc_find_dev_rtnl(net, group, gsf->gf_interface);
0509     if (!idev)
0510         return -ENODEV;
0511
0512     err = 0;
0513
0514     if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
0515         leavegroup = 1;
0516         goto done;
0517     }
0518
0519     for_each_pmc_socklock(inet6, sk, pmc) {
0520         if (pmc->ifindex != gsf->gf_interface)
0521             continue;
0522         if (ipv6_addr_equal(&pmc->addr, group))
0523             break;
0524     }
0525     if (!pmc) {     /* must have a prior join */
0526         err = -EINVAL;
0527         goto done;
0528     }
0529     if (gsf->gf_numsrc) {
0530         newpsl = sock_kmalloc(sk, struct_size(newpsl, sl_addr,
0531                               gsf->gf_numsrc),
0532                       GFP_KERNEL);
0533         if (!newpsl) {
0534             err = -ENOBUFS;
0535             goto done;
0536         }
0537         newpsl->sl_max = newpsl->sl_count = gsf->gf_numsrc;
0538         for (i = 0; i < newpsl->sl_count; ++i, ++list) {
0539             struct sockaddr_in6 *psin6;
0540
0541             psin6 = (struct sockaddr_in6 *)list;
0542             newpsl->sl_addr[i] = psin6->sin6_addr;
0543         }
0544         mutex_lock(&idev->mc_lock);
0545         err = ip6_mc_add_src(idev, group, gsf->gf_fmode,
0546                      newpsl->sl_count, newpsl->sl_addr, 0);
0547         if (err) {
0548             mutex_unlock(&idev->mc_lock);
0549             sock_kfree_s(sk, newpsl, struct_size(newpsl, sl_addr,
0550                                  newpsl->sl_max));
0551             goto done;
0552         }
0553         mutex_unlock(&idev->mc_lock);
0554     } else {
0555         newpsl = NULL;
0556         mutex_lock(&idev->mc_lock);
0557         ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
0558         mutex_unlock(&idev->mc_lock);
0559     }
0560
0561     mutex_lock(&idev->mc_lock);
0562     psl = sock_dereference(pmc->sflist, sk);
0563     if (psl) {
0564         ip6_mc_del_src(idev, group, pmc->sfmode,
0565                    psl->sl_count, psl->sl_addr, 0);
0566         atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
0567                &sk->sk_omem_alloc);
0568     } else {
0569         ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
0570     }
0571     rcu_assign_pointer(pmc->sflist, newpsl);
0572     mutex_unlock(&idev->mc_lock);
0573     kfree_rcu(psl, rcu);
0574     pmc->sfmode = gsf->gf_fmode;
0575     err = 0;
0576 done:
0577     if (leavegroup)
0578         err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
0579     return err;
0580 }
0581
0582 int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
0583           struct sockaddr_storage __user *p)
0584 {
0585     struct ipv6_pinfo *inet6 = inet6_sk(sk);
0586     const struct in6_addr *group;
0587     struct ipv6_mc_socklist *pmc;
0588     struct ip6_sf_socklist *psl;
0589     int i, count, copycount;
0590
0591     group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
0592
0593     if (!ipv6_addr_is_multicast(group))
0594         return -EINVAL;
0595
0596     /* changes to the ipv6_mc_list require the socket lock and
0597      * rtnl lock. We have the socket lock, so reading the list is safe.
0598      */
0599
0600     for_each_pmc_socklock(inet6, sk, pmc) {
0601         if (pmc->ifindex != gsf->gf_interface)
0602             continue;
0603         if (ipv6_addr_equal(group, &pmc->addr))
0604             break;
0605     }
0606     if (!pmc)       /* must have a prior join */
0607         return -EADDRNOTAVAIL;
0608
0609     gsf->gf_fmode = pmc->sfmode;
0610     psl = sock_dereference(pmc->sflist, sk);
0611     count = psl ? psl->sl_count : 0;
0612
0613     copycount = count < gsf->gf_numsrc ? count : gsf->gf_numsrc;
0614     gsf->gf_numsrc = count;
0615
0616     for (i = 0; i < copycount; i++, p++) {
0617         struct sockaddr_in6 *psin6;
0618         struct sockaddr_storage ss;
0619
0620         psin6 = (struct sockaddr_in6 *)&ss;
0621         memset(&ss, 0, sizeof(ss));
0622         psin6->sin6_family = AF_INET6;
0623         psin6->sin6_addr = psl->sl_addr[i];
0624         if (copy_to_user(p, &ss, sizeof(ss)))
0625             return -EFAULT;
0626     }
0627     return 0;
0628 }
0629
0630 bool inet6_mc_check(struct sock *sk, const struct in6_addr *mc_addr,
0631             const struct in6_addr *src_addr)
0632 {
0633     struct ipv6_pinfo *np = inet6_sk(sk);
0634     struct ipv6_mc_socklist *mc;
0635     struct ip6_sf_socklist *psl;
0636     bool rv = true;
0637
0638     rcu_read_lock();
0639     for_each_pmc_rcu(np, mc) {
0640         if (ipv6_addr_equal(&mc->addr, mc_addr))
0641             break;
0642     }
0643     if (!mc) {
0644         rcu_read_unlock();
0645         return np->mc_all;
0646     }
0647     psl = rcu_dereference(mc->sflist);
0648     if (!psl) {
0649         rv = mc->sfmode == MCAST_EXCLUDE;
0650     } else {
0651         int i;
0652
0653         for (i = 0; i < psl->sl_count; i++) {
0654             if (ipv6_addr_equal(&psl->sl_addr[i], src_addr))
0655                 break;
0656         }
0657         if (mc->sfmode == MCAST_INCLUDE && i >= psl->sl_count)
0658             rv = false;
0659         if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
0660             rv = false;
0661     }
0662     rcu_read_unlock();
0663
0664     return rv;
0665 }
0666
0667 /* called with mc_lock */
0668 static void igmp6_group_added(struct ifmcaddr6 *mc)
0669 {
0670     struct net_device *dev = mc->idev->dev;
0671     char buf[MAX_ADDR_LEN];
0672
0673     if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
0674         IPV6_ADDR_SCOPE_LINKLOCAL)
0675         return;
0676
0677     if (!(mc->mca_flags&MAF_LOADED)) {
0678         mc->mca_flags |= MAF_LOADED;
0679         if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
0680             dev_mc_add(dev, buf);
0681     }
0682
0683     if (!(dev->flags & IFF_UP) || (mc->mca_flags & MAF_NOREPORT))
0684         return;
0685
0686     if (mld_in_v1_mode(mc->idev)) {
0687         igmp6_join_group(mc);
0688         return;
0689     }
0690     /* else v2 */
0691
0692     /* Based on RFC3810 6.1, for newly added INCLUDE SSM, we
0693      * should not send filter-mode change record as the mode
0694      * should be from IN() to IN(A).
0695      */
0696     if (mc->mca_sfmode == MCAST_EXCLUDE)
0697         mc->mca_crcount = mc->idev->mc_qrv;
0698
0699     mld_ifc_event(mc->idev);
0700 }
0701
0702 /* called with mc_lock */
0703 static void igmp6_group_dropped(struct ifmcaddr6 *mc)
0704 {
0705     struct net_device *dev = mc->idev->dev;
0706     char buf[MAX_ADDR_LEN];
0707
0708     if (IPV6_ADDR_MC_SCOPE(&mc->mca_addr) <
0709         IPV6_ADDR_SCOPE_LINKLOCAL)
0710         return;
0711
0712     if (mc->mca_flags&MAF_LOADED) {
0713         mc->mca_flags &= ~MAF_LOADED;
0714         if (ndisc_mc_map(&mc->mca_addr, buf, dev, 0) == 0)
0715             dev_mc_del(dev, buf);
0716     }
0717
0718     if (mc->mca_flags & MAF_NOREPORT)
0719         return;
0720
0721     if (!mc->idev->dead)
0722         igmp6_leave_group(mc);
0723
0724     if (cancel_delayed_work(&mc->mca_work))
0725         refcount_dec(&mc->mca_refcnt);
0726 }
0727
0728 /*
0729  * deleted ifmcaddr6 manipulation
0730  * called with mc_lock
0731  */
0732 static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
0733 {
0734     struct ifmcaddr6 *pmc;
0735
0736     /* this is an "ifmcaddr6" for convenience; only the fields below
0737      * are actually used. In particular, the refcnt and users are not
0738      * used for management of the delete list. Using the same structure
0739      * for deleted items allows change reports to use common code with
0740      * non-deleted or query-response MCA's.
0741      */
0742     pmc = kzalloc(sizeof(*pmc), GFP_KERNEL);
0743     if (!pmc)
0744         return;
0745
0746     pmc->idev = im->idev;
0747     in6_dev_hold(idev);
0748     pmc->mca_addr = im->mca_addr;
0749     pmc->mca_crcount = idev->mc_qrv;
0750     pmc->mca_sfmode = im->mca_sfmode;
0751     if (pmc->mca_sfmode == MCAST_INCLUDE) {
0752         struct ip6_sf_list *psf;
0753
0754         rcu_assign_pointer(pmc->mca_tomb,
0755                    mc_dereference(im->mca_tomb, idev));
0756         rcu_assign_pointer(pmc->mca_sources,
0757                    mc_dereference(im->mca_sources, idev));
0758         RCU_INIT_POINTER(im->mca_tomb, NULL);
0759         RCU_INIT_POINTER(im->mca_sources, NULL);
0760
0761         for_each_psf_mclock(pmc, psf)
0762             psf->sf_crcount = pmc->mca_crcount;
0763     }
0764
0765     rcu_assign_pointer(pmc->next, idev->mc_tomb);
0766     rcu_assign_pointer(idev->mc_tomb, pmc);
0767 }
0768
0769 /* called with mc_lock */
0770 static void mld_del_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
0771 {
0772     struct ip6_sf_list *psf, *sources, *tomb;
0773     struct in6_addr *pmca = &im->mca_addr;
0774     struct ifmcaddr6 *pmc, *pmc_prev;
0775
0776     pmc_prev = NULL;
0777     for_each_mc_tomb(idev, pmc) {
0778         if (ipv6_addr_equal(&pmc->mca_addr, pmca))
0779             break;
0780         pmc_prev = pmc;
0781     }
0782     if (pmc) {
0783         if (pmc_prev)
0784             rcu_assign_pointer(pmc_prev->next, pmc->next);
0785         else
0786             rcu_assign_pointer(idev->mc_tomb, pmc->next);
0787     }
0788
0789     if (pmc) {
0790         im->idev = pmc->idev;
0791         if (im->mca_sfmode == MCAST_INCLUDE) {
0792             tomb = rcu_replace_pointer(im->mca_tomb,
0793                            mc_dereference(pmc->mca_tomb, pmc->idev),
0794                            lockdep_is_held(&im->idev->mc_lock));
0795             rcu_assign_pointer(pmc->mca_tomb, tomb);
0796
0797             sources = rcu_replace_pointer(im->mca_sources,
0798                               mc_dereference(pmc->mca_sources, pmc->idev),
0799                               lockdep_is_held(&im->idev->mc_lock));
0800             rcu_assign_pointer(pmc->mca_sources, sources);
0801             for_each_psf_mclock(im, psf)
0802                 psf->sf_crcount = idev->mc_qrv;
0803         } else {
0804             im->mca_crcount = idev->mc_qrv;
0805         }
0806         in6_dev_put(pmc->idev);
0807         ip6_mc_clear_src(pmc);
0808         kfree_rcu(pmc, rcu);
0809     }
0810 }
0811
0812 /* called with mc_lock */
0813 static void mld_clear_delrec(struct inet6_dev *idev)
0814 {
0815     struct ifmcaddr6 *pmc, *nextpmc;
0816
0817     pmc = mc_dereference(idev->mc_tomb, idev);
0818     RCU_INIT_POINTER(idev->mc_tomb, NULL);
0819
0820     for (; pmc; pmc = nextpmc) {
0821         nextpmc = mc_dereference(pmc->next, idev);
0822         ip6_mc_clear_src(pmc);
0823         in6_dev_put(pmc->idev);
0824         kfree_rcu(pmc, rcu);
0825     }
0826
0827     /* clear dead sources, too */
0828     for_each_mc_mclock(idev, pmc) {
0829         struct ip6_sf_list *psf, *psf_next;
0830
0831         psf = mc_dereference(pmc->mca_tomb, idev);
0832         RCU_INIT_POINTER(pmc->mca_tomb, NULL);
0833         for (; psf; psf = psf_next) {
0834             psf_next = mc_dereference(psf->sf_next, idev);
0835             kfree_rcu(psf, rcu);
0836         }
0837     }
0838 }
0839
0840 static void mld_clear_query(struct inet6_dev *idev)
0841 {
0842     struct sk_buff *skb;
0843
0844     spin_lock_bh(&idev->mc_query_lock);
0845     while ((skb = __skb_dequeue(&idev->mc_query_queue)))
0846         kfree_skb(skb);
0847     spin_unlock_bh(&idev->mc_query_lock);
0848 }
0849
0850 static void mld_clear_report(struct inet6_dev *idev)
0851 {
0852     struct sk_buff *skb;
0853
0854     spin_lock_bh(&idev->mc_report_lock);
0855     while ((skb = __skb_dequeue(&idev->mc_report_queue)))
0856         kfree_skb(skb);
0857     spin_unlock_bh(&idev->mc_report_lock);
0858 }
0859
0860 static void mca_get(struct ifmcaddr6 *mc)
0861 {
0862     refcount_inc(&mc->mca_refcnt);
0863 }
0864
0865 static void ma_put(struct ifmcaddr6 *mc)
0866 {
0867     if (refcount_dec_and_test(&mc->mca_refcnt)) {
0868         in6_dev_put(mc->idev);
0869         kfree_rcu(mc, rcu);
0870     }
0871 }
0872
0873 /* called with mc_lock */
0874 static struct ifmcaddr6 *mca_alloc(struct inet6_dev *idev,
0875                    const struct in6_addr *addr,
0876                    unsigned int mode)
0877 {
0878     struct ifmcaddr6 *mc;
0879
0880     mc = kzalloc(sizeof(*mc), GFP_KERNEL);
0881     if (!mc)
0882         return NULL;
0883
0884     INIT_DELAYED_WORK(&mc->mca_work, mld_mca_work);
0885
0886     mc->mca_addr = *addr;
0887     mc->idev = idev; /* reference taken by caller */
0888     mc->mca_users = 1;
0889     /* mca_stamp should be updated upon changes */
0890     mc->mca_cstamp = mc->mca_tstamp = jiffies;
0891     refcount_set(&mc->mca_refcnt, 1);
0892
0893     mc->mca_sfmode = mode;
0894     mc->mca_sfcount[mode] = 1;
0895
0896     if (ipv6_addr_is_ll_all_nodes(&mc->mca_addr) ||
0897         IPV6_ADDR_MC_SCOPE(&mc->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
0898         mc->mca_flags |= MAF_NOREPORT;
0899
0900     return mc;
0901 }
0902
0903 /*
0904  *  device multicast group inc (add if not found)
0905  */
0906 static int __ipv6_dev_mc_inc(struct net_device *dev,
0907                  const struct in6_addr *addr, unsigned int mode)
0908 {
0909     struct ifmcaddr6 *mc;
0910     struct inet6_dev *idev;
0911
0912     ASSERT_RTNL();
0913
0914     /* we need to take a reference on idev */
0915     idev = in6_dev_get(dev);
0916
0917     if (!idev)
0918         return -EINVAL;
0919
0920     if (idev->dead) {
0921         in6_dev_put(idev);
0922         return -ENODEV;
0923     }
0924
0925     mutex_lock(&idev->mc_lock);
0926     for_each_mc_mclock(idev, mc) {
0927         if (ipv6_addr_equal(&mc->mca_addr, addr)) {
0928             mc->mca_users++;
0929             ip6_mc_add_src(idev, &mc->mca_addr, mode, 0, NULL, 0);
0930             mutex_unlock(&idev->mc_lock);
0931             in6_dev_put(idev);
0932             return 0;
0933         }
0934     }
0935
0936     mc = mca_alloc(idev, addr, mode);
0937     if (!mc) {
0938         mutex_unlock(&idev->mc_lock);
0939         in6_dev_put(idev);
0940         return -ENOMEM;
0941     }
0942
0943     rcu_assign_pointer(mc->next, idev->mc_list);
0944     rcu_assign_pointer(idev->mc_list, mc);
0945
0946     mca_get(mc);
0947
0948     mld_del_delrec(idev, mc);
0949     igmp6_group_added(mc);
0950     mutex_unlock(&idev->mc_lock);
0951     ma_put(mc);
0952     return 0;
0953 }
0954
0955 int ipv6_dev_mc_inc(struct net_device *dev, const struct in6_addr *addr)
0956 {
0957     return __ipv6_dev_mc_inc(dev, addr, MCAST_EXCLUDE);
0958 }
0959 EXPORT_SYMBOL(ipv6_dev_mc_inc);
0960
0961 /*
0962  * device multicast group del
0963  */
0964 int __ipv6_dev_mc_dec(struct inet6_dev *idev, const struct in6_addr *addr)
0965 {
0966     struct ifmcaddr6 *ma, __rcu **map;
0967
0968     ASSERT_RTNL();
0969
0970     mutex_lock(&idev->mc_lock);
0971     for (map = &idev->mc_list;
0972          (ma = mc_dereference(*map, idev));
0973          map = &ma->next) {
0974         if (ipv6_addr_equal(&ma->mca_addr, addr)) {
0975             if (--ma->mca_users == 0) {
0976                 *map = ma->next;
0977
0978                 igmp6_group_dropped(ma);
0979                 ip6_mc_clear_src(ma);
0980                 mutex_unlock(&idev->mc_lock);
0981
0982                 ma_put(ma);
0983                 return 0;
0984             }
0985             mutex_unlock(&idev->mc_lock);
0986             return 0;
0987         }
0988     }
0989
0990     mutex_unlock(&idev->mc_lock);
0991     return -ENOENT;
0992 }
0993
0994 int ipv6_dev_mc_dec(struct net_device *dev, const struct in6_addr *addr)
0995 {
0996     struct inet6_dev *idev;
0997     int err;
0998
0999     ASSERT_RTNL();
1000
1001     idev = __in6_dev_get(dev);
1002     if (!idev)
1003         err = -ENODEV;
1004     else
1005         err = __ipv6_dev_mc_dec(idev, addr);
1006
1007     return err;
1008 }
1009 EXPORT_SYMBOL(ipv6_dev_mc_dec);
1010
1011 /*
1012  *  check if the interface/address pair is valid
1013  */
1014 bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
1015              const struct in6_addr *src_addr)
1016 {
1017     struct inet6_dev *idev;
1018     struct ifmcaddr6 *mc;
1019     bool rv = false;
1020
1021     rcu_read_lock();
1022     idev = __in6_dev_get(dev);
1023     if (idev) {
1024         for_each_mc_rcu(idev, mc) {
1025             if (ipv6_addr_equal(&mc->mca_addr, group))
1026                 break;
1027         }
1028         if (mc) {
1029             if (src_addr && !ipv6_addr_any(src_addr)) {
1030                 struct ip6_sf_list *psf;
1031
1032                 for_each_psf_rcu(mc, psf) {
1033                     if (ipv6_addr_equal(&psf->sf_addr, src_addr))
1034                         break;
1035                 }
1036                 if (psf)
1037                     rv = psf->sf_count[MCAST_INCLUDE] ||
1038                         psf->sf_count[MCAST_EXCLUDE] !=
1039                         mc->mca_sfcount[MCAST_EXCLUDE];
1040                 else
1041                     rv = mc->mca_sfcount[MCAST_EXCLUDE] != 0;
1042             } else
1043                 rv = true; /* don't filter unspecified source */
1044         }
1045     }
1046     rcu_read_unlock();
1047     return rv;
1048 }
1049
1050 /* called with mc_lock */
1051 static void mld_gq_start_work(struct inet6_dev *idev)
1052 {
1053     unsigned long tv = prandom_u32() % idev->mc_maxdelay;
1054
1055     idev->mc_gq_running = 1;
1056     if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
1057         in6_dev_hold(idev);
1058 }
1059
1060 /* called with mc_lock */
1061 static void mld_gq_stop_work(struct inet6_dev *idev)
1062 {
1063     idev->mc_gq_running = 0;
1064     if (cancel_delayed_work(&idev->mc_gq_work))
1065         __in6_dev_put(idev);
1066 }
1067
1068 /* called with mc_lock */
1069 static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
1070 {
1071     unsigned long tv = prandom_u32() % delay;
1072
1073     if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
1074         in6_dev_hold(idev);
1075 }
1076
1077 /* called with mc_lock */
1078 static void mld_ifc_stop_work(struct inet6_dev *idev)
1079 {
1080     idev->mc_ifc_count = 0;
1081     if (cancel_delayed_work(&idev->mc_ifc_work))
1082         __in6_dev_put(idev);
1083 }
1084
1085 /* called with mc_lock */
1086 static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
1087 {
1088     unsigned long tv = prandom_u32() % delay;
1089
1090     if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
1091         in6_dev_hold(idev);
1092 }
1093
1094 static void mld_dad_stop_work(struct inet6_dev *idev)
1095 {
1096     if (cancel_delayed_work(&idev->mc_dad_work))
1097         __in6_dev_put(idev);
1098 }
1099
1100 static void mld_query_stop_work(struct inet6_dev *idev)
1101 {
1102     spin_lock_bh(&idev->mc_query_lock);
1103     if (cancel_delayed_work(&idev->mc_query_work))
1104         __in6_dev_put(idev);
1105     spin_unlock_bh(&idev->mc_query_lock);
1106 }
1107
1108 static void mld_report_stop_work(struct inet6_dev *idev)
1109 {
1110     if (cancel_delayed_work_sync(&idev->mc_report_work))
1111         __in6_dev_put(idev);
1112 }
1113
1114 /*
1115  * IGMP handling (alias multicast ICMPv6 messages)
1116  * called with mc_lock
1117  */
1118 static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
1119 {
1120     unsigned long delay = resptime;
1121
1122     /* Do not start work for these addresses */
1123     if (ipv6_addr_is_ll_all_nodes(&ma->mca_addr) ||
1124         IPV6_ADDR_MC_SCOPE(&ma->mca_addr) < IPV6_ADDR_SCOPE_LINKLOCAL)
1125         return;
1126
1127     if (cancel_delayed_work(&ma->mca_work)) {
1128         refcount_dec(&ma->mca_refcnt);
1129         delay = ma->mca_work.timer.expires - jiffies;
1130     }
1131
1132     if (delay >= resptime)
1133         delay = prandom_u32() % resptime;
1134
1135     if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
1136         refcount_inc(&ma->mca_refcnt);
1137     ma->mca_flags |= MAF_TIMER_RUNNING;
1138 }
1139
1140 /* mark EXCLUDE-mode sources
1141  * called with mc_lock
1142  */
1143 static bool mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
1144                  const struct in6_addr *srcs)
1145 {
1146     struct ip6_sf_list *psf;
1147     int i, scount;
1148
1149     scount = 0;
1150     for_each_psf_mclock(pmc, psf) {
1151         if (scount == nsrcs)
1152             break;
1153         for (i = 0; i < nsrcs; i++) {
1154             /* skip inactive filters */
1155             if (psf->sf_count[MCAST_INCLUDE] ||
1156                 pmc->mca_sfcount[MCAST_EXCLUDE] !=
1157                 psf->sf_count[MCAST_EXCLUDE])
1158                 break;
1159             if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1160                 scount++;
1161                 break;
1162             }
1163         }
1164     }
1165     pmc->mca_flags &= ~MAF_GSQUERY;
1166     if (scount == nsrcs)    /* all sources excluded */
1167         return false;
1168     return true;
1169 }
1170
1171 /* called with mc_lock */
1172 static bool mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
1173                 const struct in6_addr *srcs)
1174 {
1175     struct ip6_sf_list *psf;
1176     int i, scount;
1177
1178     if (pmc->mca_sfmode == MCAST_EXCLUDE)
1179         return mld_xmarksources(pmc, nsrcs, srcs);
1180
1181     /* mark INCLUDE-mode sources */
1182
1183     scount = 0;
1184     for_each_psf_mclock(pmc, psf) {
1185         if (scount == nsrcs)
1186             break;
1187         for (i = 0; i < nsrcs; i++) {
1188             if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
1189                 psf->sf_gsresp = 1;
1190                 scount++;
1191                 break;
1192             }
1193         }
1194     }
1195     if (!scount) {
1196         pmc->mca_flags &= ~MAF_GSQUERY;
1197         return false;
1198     }
1199     pmc->mca_flags |= MAF_GSQUERY;
1200     return true;
1201 }
1202
1203 static int mld_force_mld_version(const struct inet6_dev *idev)
1204 {
1205     /* Normally, both are 0 here. If enforcement to a particular is
1206      * being used, individual device enforcement will have a lower
1207      * precedence over 'all' device (.../conf/all/force_mld_version).
1208      */
1209
1210     if (dev_net(idev->dev)->ipv6.devconf_all->force_mld_version != 0)
1211         return dev_net(idev->dev)->ipv6.devconf_all->force_mld_version;
1212     else
1213         return idev->cnf.force_mld_version;
1214 }
1215
1216 static bool mld_in_v2_mode_only(const struct inet6_dev *idev)
1217 {
1218     return mld_force_mld_version(idev) == 2;
1219 }
1220
1221 static bool mld_in_v1_mode_only(const struct inet6_dev *idev)
1222 {
1223     return mld_force_mld_version(idev) == 1;
1224 }
1225
1226 static bool mld_in_v1_mode(const struct inet6_dev *idev)
1227 {
1228     if (mld_in_v2_mode_only(idev))
1229         return false;
1230     if (mld_in_v1_mode_only(idev))
1231         return true;
1232     if (idev->mc_v1_seen && time_before(jiffies, idev->mc_v1_seen))
1233         return true;
1234
1235     return false;
1236 }
1237
1238 static void mld_set_v1_mode(struct inet6_dev *idev)
1239 {
1240     /* RFC3810, relevant sections:
1241      *  - 9.1. Robustness Variable
1242      *  - 9.2. Query Interval
1243      *  - 9.3. Query Response Interval
1244      *  - 9.12. Older Version Querier Present Timeout
1245      */
1246     unsigned long switchback;
1247
1248     switchback = (idev->mc_qrv * idev->mc_qi) + idev->mc_qri;
1249
1250     idev->mc_v1_seen = jiffies + switchback;
1251 }
1252
1253 static void mld_update_qrv(struct inet6_dev *idev,
1254                const struct mld2_query *mlh2)
1255 {
1256     /* RFC3810, relevant sections:
1257      *  - 5.1.8. QRV (Querier's Robustness Variable)
1258      *  - 9.1. Robustness Variable
1259      */
1260
1261     /* The value of the Robustness Variable MUST NOT be zero,
1262      * and SHOULD NOT be one. Catch this here if we ever run
1263      * into such a case in future.
1264      */
1265     const int min_qrv = min(MLD_QRV_DEFAULT, sysctl_mld_qrv);
1266     WARN_ON(idev->mc_qrv == 0);
1267
1268     if (mlh2->mld2q_qrv > 0)
1269         idev->mc_qrv = mlh2->mld2q_qrv;
1270
1271     if (unlikely(idev->mc_qrv < min_qrv)) {
1272         net_warn_ratelimited("IPv6: MLD: clamping QRV from %u to %u!\n",
1273                      idev->mc_qrv, min_qrv);
1274         idev->mc_qrv = min_qrv;
1275     }
1276 }
1277
1278 static void mld_update_qi(struct inet6_dev *idev,
1279               const struct mld2_query *mlh2)
1280 {
1281     /* RFC3810, relevant sections:
1282      *  - 5.1.9. QQIC (Querier's Query Interval Code)
1283      *  - 9.2. Query Interval
1284      *  - 9.12. Older Version Querier Present Timeout
1285      *    (the [Query Interval] in the last Query received)
1286      */
1287     unsigned long mc_qqi;
1288
1289     if (mlh2->mld2q_qqic < 128) {
1290         mc_qqi = mlh2->mld2q_qqic;
1291     } else {
1292         unsigned long mc_man, mc_exp;
1293
1294         mc_exp = MLDV2_QQIC_EXP(mlh2->mld2q_qqic);
1295         mc_man = MLDV2_QQIC_MAN(mlh2->mld2q_qqic);
1296
1297         mc_qqi = (mc_man | 0x10) << (mc_exp + 3);
1298     }
1299
1300     idev->mc_qi = mc_qqi * HZ;
1301 }
1302
1303 static void mld_update_qri(struct inet6_dev *idev,
1304                const struct mld2_query *mlh2)
1305 {
1306     /* RFC3810, relevant sections:
1307      *  - 5.1.3. Maximum Response Code
1308      *  - 9.3. Query Response Interval
1309      */
1310     idev->mc_qri = msecs_to_jiffies(mldv2_mrc(mlh2));
1311 }
1312
1313 static int mld_process_v1(struct inet6_dev *idev, struct mld_msg *mld,
1314               unsigned long *max_delay, bool v1_query)
1315 {
1316     unsigned long mldv1_md;
1317
1318     /* Ignore v1 queries */
1319     if (mld_in_v2_mode_only(idev))
1320         return -EINVAL;
1321
1322     mldv1_md = ntohs(mld->mld_maxdelay);
1323
1324     /* When in MLDv1 fallback and a MLDv2 router start-up being
1325      * unaware of current MLDv1 operation, the MRC == MRD mapping
1326      * only works when the exponential algorithm is not being
1327      * used (as MLDv1 is unaware of such things).
1328      *
1329      * According to the RFC author, the MLDv2 implementations
1330      * he's aware of all use a MRC < 32768 on start up queries.
1331      *
1332      * Thus, should we *ever* encounter something else larger
1333      * than that, just assume the maximum possible within our
1334      * reach.
1335      */
1336     if (!v1_query)
1337         mldv1_md = min(mldv1_md, MLDV1_MRD_MAX_COMPAT);
1338
1339     *max_delay = max(msecs_to_jiffies(mldv1_md), 1UL);
1340
1341     /* MLDv1 router present: we need to go into v1 mode *only*
1342      * when an MLDv1 query is received as per section 9.12. of
1343      * RFC3810! And we know from RFC2710 section 3.7 that MLDv1
1344      * queries MUST be of exactly 24 octets.
1345      */
1346     if (v1_query)
1347         mld_set_v1_mode(idev);
1348
1349     /* cancel MLDv2 report work */
1350     mld_gq_stop_work(idev);
1351     /* cancel the interface change work */
1352     mld_ifc_stop_work(idev);
1353     /* clear deleted report items */
1354     mld_clear_delrec(idev);
1355
1356     return 0;
1357 }
1358
1359 static void mld_process_v2(struct inet6_dev *idev, struct mld2_query *mld,
1360                unsigned long *max_delay)
1361 {
1362     *max_delay = max(msecs_to_jiffies(mldv2_mrc(mld)), 1UL);
1363
1364     mld_update_qrv(idev, mld);
1365     mld_update_qi(idev, mld);
1366     mld_update_qri(idev, mld);
1367
1368     idev->mc_maxdelay = *max_delay;
1369
1370     return;
1371 }
1372
1373 /* called with rcu_read_lock() */
1374 void igmp6_event_query(struct sk_buff *skb)
1375 {
1376     struct inet6_dev *idev = __in6_dev_get(skb->dev);
1377
1378     if (!idev || idev->dead)
1379         goto out;
1380
1381     spin_lock_bh(&idev->mc_query_lock);
1382     if (skb_queue_len(&idev->mc_query_queue) < MLD_MAX_SKBS) {
1383         __skb_queue_tail(&idev->mc_query_queue, skb);
1384         if (!mod_delayed_work(mld_wq, &idev->mc_query_work, 0))
1385             in6_dev_hold(idev);
1386         skb = NULL;
1387     }
1388     spin_unlock_bh(&idev->mc_query_lock);
1389 out:
1390     kfree_skb(skb);
1391 }
1392
1393 static void __mld_query_work(struct sk_buff *skb)
1394 {
1395     struct mld2_query *mlh2 = NULL;
1396     const struct in6_addr *group;
1397     unsigned long max_delay;
1398     struct inet6_dev *idev;
1399     struct ifmcaddr6 *ma;
1400     struct mld_msg *mld;
1401     int group_type;
1402     int mark = 0;
1403     int len, err;
1404
1405     if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
1406         goto kfree_skb;
1407
1408     /* compute payload length excluding extension headers */
1409     len = ntohs(ipv6_hdr(skb)->payload_len) + sizeof(struct ipv6hdr);
1410     len -= skb_network_header_len(skb);
1411
1412     /* RFC3810 6.2
1413      * Upon reception of an MLD message that contains a Query, the node
1414      * checks if the source address of the message is a valid link-local
1415      * address, if the Hop Limit is set to 1, and if the Router Alert
1416      * option is present in the Hop-By-Hop Options header of the IPv6
1417      * packet.  If any of these checks fails, the packet is dropped.
1418      */
1419     if (!(ipv6_addr_type(&ipv6_hdr(skb)->saddr) & IPV6_ADDR_LINKLOCAL) ||
1420         ipv6_hdr(skb)->hop_limit != 1 ||
1421         !(IP6CB(skb)->flags & IP6SKB_ROUTERALERT) ||
1422         IP6CB(skb)->ra != htons(IPV6_OPT_ROUTERALERT_MLD))
1423         goto kfree_skb;
1424
1425     idev = in6_dev_get(skb->dev);
1426     if (!idev)
1427         goto kfree_skb;
1428
1429     mld = (struct mld_msg *)icmp6_hdr(skb);
1430     group = &mld->mld_mca;
1431     group_type = ipv6_addr_type(group);
1432
1433     if (group_type != IPV6_ADDR_ANY &&
1434         !(group_type&IPV6_ADDR_MULTICAST))
1435         goto out;
1436
1437     if (len < MLD_V1_QUERY_LEN) {
1438         goto out;
1439     } else if (len == MLD_V1_QUERY_LEN || mld_in_v1_mode(idev)) {
1440         err = mld_process_v1(idev, mld, &max_delay,
1441                      len == MLD_V1_QUERY_LEN);
1442         if (err < 0)
1443             goto out;
1444     } else if (len >= MLD_V2_QUERY_LEN_MIN) {
1445         int srcs_offset = sizeof(struct mld2_query) -
1446                   sizeof(struct icmp6hdr);
1447
1448         if (!pskb_may_pull(skb, srcs_offset))
1449             goto out;
1450
1451         mlh2 = (struct mld2_query *)skb_transport_header(skb);
1452
1453         mld_process_v2(idev, mlh2, &max_delay);
1454
1455         if (group_type == IPV6_ADDR_ANY) { /* general query */
1456             if (mlh2->mld2q_nsrcs)
1457                 goto out; /* no sources allowed */
1458
1459             mld_gq_start_work(idev);
1460             goto out;
1461         }
1462         /* mark sources to include, if group & source-specific */
1463         if (mlh2->mld2q_nsrcs != 0) {
1464             if (!pskb_may_pull(skb, srcs_offset +
1465                 ntohs(mlh2->mld2q_nsrcs) * sizeof(struct in6_addr)))
1466                 goto out;
1467
1468             mlh2 = (struct mld2_query *)skb_transport_header(skb);
1469             mark = 1;
1470         }
1471     } else {
1472         goto out;
1473     }
1474
1475     if (group_type == IPV6_ADDR_ANY) {
1476         for_each_mc_mclock(idev, ma) {
1477             igmp6_group_queried(ma, max_delay);
1478         }
1479     } else {
1480         for_each_mc_mclock(idev, ma) {
1481             if (!ipv6_addr_equal(group, &ma->mca_addr))
1482                 continue;
1483             if (ma->mca_flags & MAF_TIMER_RUNNING) {
1484                 /* gsquery <- gsquery && mark */
1485                 if (!mark)
1486                     ma->mca_flags &= ~MAF_GSQUERY;
1487             } else {
1488                 /* gsquery <- mark */
1489                 if (mark)
1490                     ma->mca_flags |= MAF_GSQUERY;
1491                 else
1492                     ma->mca_flags &= ~MAF_GSQUERY;
1493             }
1494             if (!(ma->mca_flags & MAF_GSQUERY) ||
1495                 mld_marksources(ma, ntohs(mlh2->mld2q_nsrcs), mlh2->mld2q_srcs))
1496                 igmp6_group_queried(ma, max_delay);
1497             break;
1498         }
1499     }
1500
1501 out:
1502     in6_dev_put(idev);
1503 kfree_skb:
1504     consume_skb(skb);
1505 }
1506
1507 static void mld_query_work(struct work_struct *work)
1508 {
1509     struct inet6_dev *idev = container_of(to_delayed_work(work),
1510                           struct inet6_dev,
1511                           mc_query_work);
1512     struct sk_buff_head q;
1513     struct sk_buff *skb;
1514     bool rework = false;
1515     int cnt = 0;
1516
1517     skb_queue_head_init(&q);
1518
1519     spin_lock_bh(&idev->mc_query_lock);
1520     while ((skb = __skb_dequeue(&idev->mc_query_queue))) {
1521         __skb_queue_tail(&q, skb);
1522
1523         if (++cnt >= MLD_MAX_QUEUE) {
1524             rework = true;
1525             break;
1526         }
1527     }
1528     spin_unlock_bh(&idev->mc_query_lock);
1529
1530     mutex_lock(&idev->mc_lock);
1531     while ((skb = __skb_dequeue(&q)))
1532         __mld_query_work(skb);
1533     mutex_unlock(&idev->mc_lock);
1534
1535     if (rework && queue_delayed_work(mld_wq, &idev->mc_query_work, 0))
1536         return;
1537
1538     in6_dev_put(idev);
1539 }
1540
1541 /* called with rcu_read_lock() */
1542 void igmp6_event_report(struct sk_buff *skb)
1543 {
1544     struct inet6_dev *idev = __in6_dev_get(skb->dev);
1545
1546     if (!idev || idev->dead)
1547         goto out;
1548
1549     spin_lock_bh(&idev->mc_report_lock);
1550     if (skb_queue_len(&idev->mc_report_queue) < MLD_MAX_SKBS) {
1551         __skb_queue_tail(&idev->mc_report_queue, skb);
1552         if (!mod_delayed_work(mld_wq, &idev->mc_report_work, 0))
1553             in6_dev_hold(idev);
1554         skb = NULL;
1555     }
1556     spin_unlock_bh(&idev->mc_report_lock);
1557 out:
1558     kfree_skb(skb);
1559 }
1560
1561 static void __mld_report_work(struct sk_buff *skb)
1562 {
1563     struct inet6_dev *idev;
1564     struct ifmcaddr6 *ma;
1565     struct mld_msg *mld;
1566     int addr_type;
1567
1568     /* Our own report looped back. Ignore it. */
1569     if (skb->pkt_type == PACKET_LOOPBACK)
1570         goto kfree_skb;
1571
1572     /* send our report if the MC router may not have heard this report */
1573     if (skb->pkt_type != PACKET_MULTICAST &&
1574         skb->pkt_type != PACKET_BROADCAST)
1575         goto kfree_skb;
1576
1577     if (!pskb_may_pull(skb, sizeof(*mld) - sizeof(struct icmp6hdr)))
1578         goto kfree_skb;
1579
1580     mld = (struct mld_msg *)icmp6_hdr(skb);
1581
1582     /* Drop reports with not link local source */
1583     addr_type = ipv6_addr_type(&ipv6_hdr(skb)->saddr);
1584     if (addr_type != IPV6_ADDR_ANY &&
1585         !(addr_type&IPV6_ADDR_LINKLOCAL))
1586         goto kfree_skb;
1587
1588     idev = in6_dev_get(skb->dev);
1589     if (!idev)
1590         goto kfree_skb;
1591
1592     /*
1593      *  Cancel the work for this group
1594      */
1595
1596     for_each_mc_mclock(idev, ma) {
1597         if (ipv6_addr_equal(&ma->mca_addr, &mld->mld_mca)) {
1598             if (cancel_delayed_work(&ma->mca_work))
1599                 refcount_dec(&ma->mca_refcnt);
1600             ma->mca_flags &= ~(MAF_LAST_REPORTER |
1601                        MAF_TIMER_RUNNING);
1602             break;
1603         }
1604     }
1605
1606     in6_dev_put(idev);
1607 kfree_skb:
1608     consume_skb(skb);
1609 }
1610
1611 static void mld_report_work(struct work_struct *work)
1612 {
1613     struct inet6_dev *idev = container_of(to_delayed_work(work),
1614                           struct inet6_dev,
1615                           mc_report_work);
1616     struct sk_buff_head q;
1617     struct sk_buff *skb;
1618     bool rework = false;
1619     int cnt = 0;
1620
1621     skb_queue_head_init(&q);
1622     spin_lock_bh(&idev->mc_report_lock);
1623     while ((skb = __skb_dequeue(&idev->mc_report_queue))) {
1624         __skb_queue_tail(&q, skb);
1625
1626         if (++cnt >= MLD_MAX_QUEUE) {
1627             rework = true;
1628             break;
1629         }
1630     }
1631     spin_unlock_bh(&idev->mc_report_lock);
1632
1633     mutex_lock(&idev->mc_lock);
1634     while ((skb = __skb_dequeue(&q)))
1635         __mld_report_work(skb);
1636     mutex_unlock(&idev->mc_lock);
1637
1638     if (rework && queue_delayed_work(mld_wq, &idev->mc_report_work, 0))
1639         return;
1640
1641     in6_dev_put(idev);
1642 }
1643
1644 static bool is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
1645           int gdeleted, int sdeleted)
1646 {
1647     switch (type) {
1648     case MLD2_MODE_IS_INCLUDE:
1649     case MLD2_MODE_IS_EXCLUDE:
1650         if (gdeleted || sdeleted)
1651             return false;
1652         if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
1653             if (pmc->mca_sfmode == MCAST_INCLUDE)
1654                 return true;
1655             /* don't include if this source is excluded
1656              * in all filters
1657              */
1658             if (psf->sf_count[MCAST_INCLUDE])
1659                 return type == MLD2_MODE_IS_INCLUDE;
1660             return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1661                 psf->sf_count[MCAST_EXCLUDE];
1662         }
1663         return false;
1664     case MLD2_CHANGE_TO_INCLUDE:
1665         if (gdeleted || sdeleted)
1666             return false;
1667         return psf->sf_count[MCAST_INCLUDE] != 0;
1668     case MLD2_CHANGE_TO_EXCLUDE:
1669         if (gdeleted || sdeleted)
1670             return false;
1671         if (pmc->mca_sfcount[MCAST_EXCLUDE] == 0 ||
1672             psf->sf_count[MCAST_INCLUDE])
1673             return false;
1674         return pmc->mca_sfcount[MCAST_EXCLUDE] ==
1675             psf->sf_count[MCAST_EXCLUDE];
1676     case MLD2_ALLOW_NEW_SOURCES:
1677         if (gdeleted || !psf->sf_crcount)
1678             return false;
1679         return (pmc->mca_sfmode == MCAST_INCLUDE) ^ sdeleted;
1680     case MLD2_BLOCK_OLD_SOURCES:
1681         if (pmc->mca_sfmode == MCAST_INCLUDE)
1682             return gdeleted || (psf->sf_crcount && sdeleted);
1683         return psf->sf_crcount && !gdeleted && !sdeleted;
1684     }
1685     return false;
1686 }
1687
1688 static int
1689 mld_scount(struct ifmcaddr6 *pmc, int type, int gdeleted, int sdeleted)
1690 {
1691     struct ip6_sf_list *psf;
1692     int scount = 0;
1693
1694     for_each_psf_mclock(pmc, psf) {
1695         if (!is_in(pmc, psf, type, gdeleted, sdeleted))
1696             continue;
1697         scount++;
1698     }
1699     return scount;
1700 }
1701
1702 static void ip6_mc_hdr(struct sock *sk, struct sk_buff *skb,
1703                struct net_device *dev,
1704                const struct in6_addr *saddr,
1705                const struct in6_addr *daddr,
1706                int proto, int len)
1707 {
1708     struct ipv6hdr *hdr;
1709
1710     skb->protocol = htons(ETH_P_IPV6);
1711     skb->dev = dev;
1712
1713     skb_reset_network_header(skb);
1714     skb_put(skb, sizeof(struct ipv6hdr));
1715     hdr = ipv6_hdr(skb);
1716
1717     ip6_flow_hdr(hdr, 0, 0);
1718
1719     hdr->payload_len = htons(len);
1720     hdr->nexthdr = proto;
1721     hdr->hop_limit = inet6_sk(sk)->hop_limit;
1722
1723     hdr->saddr = *saddr;
1724     hdr->daddr = *daddr;
1725 }
1726
1727 static struct sk_buff *mld_newpack(struct inet6_dev *idev, unsigned int mtu)
1728 {
1729     u8 ra[8] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
1730              2, 0, 0, IPV6_TLV_PADN, 0 };
1731     struct net_device *dev = idev->dev;
1732     int hlen = LL_RESERVED_SPACE(dev);
1733     int tlen = dev->needed_tailroom;
1734     struct net *net = dev_net(dev);
1735     const struct in6_addr *saddr;
1736     struct in6_addr addr_buf;
1737     struct mld2_report *pmr;
1738     struct sk_buff *skb;
1739     unsigned int size;
1740     struct sock *sk;
1741     int err;
1742
1743     sk = net->ipv6.igmp_sk;
1744     /* we assume size > sizeof(ra) here
1745      * Also try to not allocate high-order pages for big MTU
1746      */
1747     size = min_t(int, mtu, PAGE_SIZE / 2) + hlen + tlen;
1748     skb = sock_alloc_send_skb(sk, size, 1, &err);
1749     if (!skb)
1750         return NULL;
1751
1752     skb->priority = TC_PRIO_CONTROL;
1753     skb_reserve(skb, hlen);
1754     skb_tailroom_reserve(skb, mtu, tlen);
1755
1756     if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
1757         /* <draft-ietf-magma-mld-source-05.txt>:
1758          * use unspecified address as the source address
1759          * when a valid link-local address is not available.
1760          */
1761         saddr = &in6addr_any;
1762     } else
1763         saddr = &addr_buf;
1764
1765     ip6_mc_hdr(sk, skb, dev, saddr, &mld2_all_mcr, NEXTHDR_HOP, 0);
1766
1767     skb_put_data(skb, ra, sizeof(ra));
1768
1769     skb_set_transport_header(skb, skb_tail_pointer(skb) - skb->data);
1770     skb_put(skb, sizeof(*pmr));
1771     pmr = (struct mld2_report *)skb_transport_header(skb);
1772     pmr->mld2r_type = ICMPV6_MLD2_REPORT;
1773     pmr->mld2r_resv1 = 0;
1774     pmr->mld2r_cksum = 0;
1775     pmr->mld2r_resv2 = 0;
1776     pmr->mld2r_ngrec = 0;
1777     return skb;
1778 }
1779
1780 static void mld_sendpack(struct sk_buff *skb)
1781 {
1782     struct ipv6hdr *pip6 = ipv6_hdr(skb);
1783     struct mld2_report *pmr =
1784                   (struct mld2_report *)skb_transport_header(skb);
1785     int payload_len, mldlen;
1786     struct inet6_dev *idev;
1787     struct net *net = dev_net(skb->dev);
1788     int err;
1789     struct flowi6 fl6;
1790     struct dst_entry *dst;
1791
1792     rcu_read_lock();
1793     idev = __in6_dev_get(skb->dev);
1794     IP6_UPD_PO_STATS(net, idev, IPSTATS_MIB_OUT, skb->len);
1795
1796     payload_len = (skb_tail_pointer(skb) - skb_network_header(skb)) -
1797         sizeof(*pip6);
1798     mldlen = skb_tail_pointer(skb) - skb_transport_header(skb);
1799     pip6->payload_len = htons(payload_len);
1800
1801     pmr->mld2r_cksum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
1802                        IPPROTO_ICMPV6,
1803                        csum_partial(skb_transport_header(skb),
1804                             mldlen, 0));
1805
1806     icmpv6_flow_init(net->ipv6.igmp_sk, &fl6, ICMPV6_MLD2_REPORT,
1807              &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
1808              skb->dev->ifindex);
1809     dst = icmp6_dst_alloc(skb->dev, &fl6);
1810
1811     err = 0;
1812     if (IS_ERR(dst)) {
1813         err = PTR_ERR(dst);
1814         dst = NULL;
1815     }
1816     skb_dst_set(skb, dst);
1817     if (err)
1818         goto err_out;
1819
1820     err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
1821               net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
1822               dst_output);
1823 out:
1824     if (!err) {
1825         ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
1826         ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
1827     } else {
1828         IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
1829     }
1830
1831     rcu_read_unlock();
1832     return;
1833
1834 err_out:
1835     kfree_skb(skb);
1836     goto out;
1837 }
1838
1839 static int grec_size(struct ifmcaddr6 *pmc, int type, int gdel, int sdel)
1840 {
1841     return sizeof(struct mld2_grec) + 16 * mld_scount(pmc,type,gdel,sdel);
1842 }
1843
1844 static struct sk_buff *add_grhead(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1845     int type, struct mld2_grec **ppgr, unsigned int mtu)
1846 {
1847     struct mld2_report *pmr;
1848     struct mld2_grec *pgr;
1849
1850     if (!skb) {
1851         skb = mld_newpack(pmc->idev, mtu);
1852         if (!skb)
1853             return NULL;
1854     }
1855     pgr = skb_put(skb, sizeof(struct mld2_grec));
1856     pgr->grec_type = type;
1857     pgr->grec_auxwords = 0;
1858     pgr->grec_nsrcs = 0;
1859     pgr->grec_mca = pmc->mca_addr;  /* structure copy */
1860     pmr = (struct mld2_report *)skb_transport_header(skb);
1861     pmr->mld2r_ngrec = htons(ntohs(pmr->mld2r_ngrec)+1);
1862     *ppgr = pgr;
1863     return skb;
1864 }
1865
1866 #define AVAILABLE(skb)  ((skb) ? skb_availroom(skb) : 0)
1867
1868 /* called with mc_lock */
1869 static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
1870                 int type, int gdeleted, int sdeleted,
1871                 int crsend)
1872 {
1873     struct ip6_sf_list *psf, *psf_prev, *psf_next;
1874     int scount, stotal, first, isquery, truncate;
1875     struct ip6_sf_list __rcu **psf_list;
1876     struct inet6_dev *idev = pmc->idev;
1877     struct net_device *dev = idev->dev;
1878     struct mld2_grec *pgr = NULL;
1879     struct mld2_report *pmr;
1880     unsigned int mtu;
1881
1882     if (pmc->mca_flags & MAF_NOREPORT)
1883         return skb;
1884
1885     mtu = READ_ONCE(dev->mtu);
1886     if (mtu < IPV6_MIN_MTU)
1887         return skb;
1888
1889     isquery = type == MLD2_MODE_IS_INCLUDE ||
1890           type == MLD2_MODE_IS_EXCLUDE;
1891     truncate = type == MLD2_MODE_IS_EXCLUDE ||
1892             type == MLD2_CHANGE_TO_EXCLUDE;
1893
1894     stotal = scount = 0;
1895
1896     psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
1897
1898     if (!rcu_access_pointer(*psf_list))
1899         goto empty_source;
1900
1901     pmr = skb ? (struct mld2_report *)skb_transport_header(skb) : NULL;
1902
1903     /* EX and TO_EX get a fresh packet, if needed */
1904     if (truncate) {
1905         if (pmr && pmr->mld2r_ngrec &&
1906             AVAILABLE(skb) < grec_size(pmc, type, gdeleted, sdeleted)) {
1907             if (skb)
1908                 mld_sendpack(skb);
1909             skb = mld_newpack(idev, mtu);
1910         }
1911     }
1912     first = 1;
1913     psf_prev = NULL;
1914     for (psf = mc_dereference(*psf_list, idev);
1915          psf;
1916          psf = psf_next) {
1917         struct in6_addr *psrc;
1918
1919         psf_next = mc_dereference(psf->sf_next, idev);
1920
1921         if (!is_in(pmc, psf, type, gdeleted, sdeleted) && !crsend) {
1922             psf_prev = psf;
1923             continue;
1924         }
1925
1926         /* Based on RFC3810 6.1. Should not send source-list change
1927          * records when there is a filter mode change.
1928          */
1929         if (((gdeleted && pmc->mca_sfmode == MCAST_EXCLUDE) ||
1930              (!gdeleted && pmc->mca_crcount)) &&
1931             (type == MLD2_ALLOW_NEW_SOURCES ||
1932              type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount)
1933             goto decrease_sf_crcount;
1934
1935         /* clear marks on query responses */
1936         if (isquery)
1937             psf->sf_gsresp = 0;
1938
1939         if (AVAILABLE(skb) < sizeof(*psrc) +
1940             first*sizeof(struct mld2_grec)) {
1941             if (truncate && !first)
1942                 break;   /* truncate these */
1943             if (pgr)
1944                 pgr->grec_nsrcs = htons(scount);
1945             if (skb)
1946                 mld_sendpack(skb);
1947             skb = mld_newpack(idev, mtu);
1948             first = 1;
1949             scount = 0;
1950         }
1951         if (first) {
1952             skb = add_grhead(skb, pmc, type, &pgr, mtu);
1953             first = 0;
1954         }
1955         if (!skb)
1956             return NULL;
1957         psrc = skb_put(skb, sizeof(*psrc));
1958         *psrc = psf->sf_addr;
1959         scount++; stotal++;
1960         if ((type == MLD2_ALLOW_NEW_SOURCES ||
1961              type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
1962 decrease_sf_crcount:
1963             psf->sf_crcount--;
1964             if ((sdeleted || gdeleted) && psf->sf_crcount == 0) {
1965                 if (psf_prev)
1966                     rcu_assign_pointer(psf_prev->sf_next,
1967                                mc_dereference(psf->sf_next, idev));
1968                 else
1969                     rcu_assign_pointer(*psf_list,
1970                                mc_dereference(psf->sf_next, idev));
1971                 kfree_rcu(psf, rcu);
1972                 continue;
1973             }
1974         }
1975         psf_prev = psf;
1976     }
1977
1978 empty_source:
1979     if (!stotal) {
1980         if (type == MLD2_ALLOW_NEW_SOURCES ||
1981             type == MLD2_BLOCK_OLD_SOURCES)
1982             return skb;
1983         if (pmc->mca_crcount || isquery || crsend) {
1984             /* make sure we have room for group header */
1985             if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
1986                 mld_sendpack(skb);
1987                 skb = NULL; /* add_grhead will get a new one */
1988             }
1989             skb = add_grhead(skb, pmc, type, &pgr, mtu);
1990         }
1991     }
1992     if (pgr)
1993         pgr->grec_nsrcs = htons(scount);
1994
1995     if (isquery)
1996         pmc->mca_flags &= ~MAF_GSQUERY; /* clear query state */
1997     return skb;
1998 }
1999
2000 /* called with mc_lock */
2001 static void mld_send_report(struct inet6_dev *idev, struct ifmcaddr6 *pmc)
2002 {
2003     struct sk_buff *skb = NULL;
2004     int type;
2005
2006     if (!pmc) {
2007         for_each_mc_mclock(idev, pmc) {
2008             if (pmc->mca_flags & MAF_NOREPORT)
2009                 continue;
2010             if (pmc->mca_sfcount[MCAST_EXCLUDE])
2011                 type = MLD2_MODE_IS_EXCLUDE;
2012             else
2013                 type = MLD2_MODE_IS_INCLUDE;
2014             skb = add_grec(skb, pmc, type, 0, 0, 0);
2015         }
2016     } else {
2017         if (pmc->mca_sfcount[MCAST_EXCLUDE])
2018             type = MLD2_MODE_IS_EXCLUDE;
2019         else
2020             type = MLD2_MODE_IS_INCLUDE;
2021         skb = add_grec(skb, pmc, type, 0, 0, 0);
2022     }
2023     if (skb)
2024         mld_sendpack(skb);
2025 }
2026
2027 /*
2028  * remove zero-count source records from a source filter list
2029  * called with mc_lock
2030  */
2031 static void mld_clear_zeros(struct ip6_sf_list __rcu **ppsf, struct inet6_dev *idev)
2032 {
2033     struct ip6_sf_list *psf_prev, *psf_next, *psf;
2034
2035     psf_prev = NULL;
2036     for (psf = mc_dereference(*ppsf, idev);
2037          psf;
2038          psf = psf_next) {
2039         psf_next = mc_dereference(psf->sf_next, idev);
2040         if (psf->sf_crcount == 0) {
2041             if (psf_prev)
2042                 rcu_assign_pointer(psf_prev->sf_next,
2043                            mc_dereference(psf->sf_next, idev));
2044             else
2045                 rcu_assign_pointer(*ppsf,
2046                            mc_dereference(psf->sf_next, idev));
2047             kfree_rcu(psf, rcu);
2048         } else {
2049             psf_prev = psf;
2050         }
2051     }
2052 }
2053
2054 /* called with mc_lock */
2055 static void mld_send_cr(struct inet6_dev *idev)
2056 {
2057     struct ifmcaddr6 *pmc, *pmc_prev, *pmc_next;
2058     struct sk_buff *skb = NULL;
2059     int type, dtype;
2060
2061     /* deleted MCA's */
2062     pmc_prev = NULL;
2063     for (pmc = mc_dereference(idev->mc_tomb, idev);
2064          pmc;
2065          pmc = pmc_next) {
2066         pmc_next = mc_dereference(pmc->next, idev);
2067         if (pmc->mca_sfmode == MCAST_INCLUDE) {
2068             type = MLD2_BLOCK_OLD_SOURCES;
2069             dtype = MLD2_BLOCK_OLD_SOURCES;
2070             skb = add_grec(skb, pmc, type, 1, 0, 0);
2071             skb = add_grec(skb, pmc, dtype, 1, 1, 0);
2072         }
2073         if (pmc->mca_crcount) {
2074             if (pmc->mca_sfmode == MCAST_EXCLUDE) {
2075                 type = MLD2_CHANGE_TO_INCLUDE;
2076                 skb = add_grec(skb, pmc, type, 1, 0, 0);
2077             }
2078             pmc->mca_crcount--;
2079             if (pmc->mca_crcount == 0) {
2080                 mld_clear_zeros(&pmc->mca_tomb, idev);
2081                 mld_clear_zeros(&pmc->mca_sources, idev);
2082             }
2083         }
2084         if (pmc->mca_crcount == 0 &&
2085             !rcu_access_pointer(pmc->mca_tomb) &&
2086             !rcu_access_pointer(pmc->mca_sources)) {
2087             if (pmc_prev)
2088                 rcu_assign_pointer(pmc_prev->next, pmc_next);
2089             else
2090                 rcu_assign_pointer(idev->mc_tomb, pmc_next);
2091             in6_dev_put(pmc->idev);
2092             kfree_rcu(pmc, rcu);
2093         } else
2094             pmc_prev = pmc;
2095     }
2096
2097     /* change recs */
2098     for_each_mc_mclock(idev, pmc) {
2099         if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2100             type = MLD2_BLOCK_OLD_SOURCES;
2101             dtype = MLD2_ALLOW_NEW_SOURCES;
2102         } else {
2103             type = MLD2_ALLOW_NEW_SOURCES;
2104             dtype = MLD2_BLOCK_OLD_SOURCES;
2105         }
2106         skb = add_grec(skb, pmc, type, 0, 0, 0);
2107         skb = add_grec(skb, pmc, dtype, 0, 1, 0);   /* deleted sources */
2108
2109         /* filter mode changes */
2110         if (pmc->mca_crcount) {
2111             if (pmc->mca_sfmode == MCAST_EXCLUDE)
2112                 type = MLD2_CHANGE_TO_EXCLUDE;
2113             else
2114                 type = MLD2_CHANGE_TO_INCLUDE;
2115             skb = add_grec(skb, pmc, type, 0, 0, 0);
2116             pmc->mca_crcount--;
2117         }
2118     }
2119     if (!skb)
2120         return;
2121     (void) mld_sendpack(skb);
2122 }
2123
2124 static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
2125 {
2126     struct net *net = dev_net(dev);
2127     struct sock *sk = net->ipv6.igmp_sk;
2128     struct inet6_dev *idev;
2129     struct sk_buff *skb;
2130     struct mld_msg *hdr;
2131     const struct in6_addr *snd_addr, *saddr;
2132     struct in6_addr addr_buf;
2133     int hlen = LL_RESERVED_SPACE(dev);
2134     int tlen = dev->needed_tailroom;
2135     int err, len, payload_len, full_len;
2136     u8 ra[8] = { IPPROTO_ICMPV6, 0,
2137              IPV6_TLV_ROUTERALERT, 2, 0, 0,
2138              IPV6_TLV_PADN, 0 };
2139     struct flowi6 fl6;
2140     struct dst_entry *dst;
2141
2142     if (type == ICMPV6_MGM_REDUCTION)
2143         snd_addr = &in6addr_linklocal_allrouters;
2144     else
2145         snd_addr = addr;
2146
2147     len = sizeof(struct icmp6hdr) + sizeof(struct in6_addr);
2148     payload_len = len + sizeof(ra);
2149     full_len = sizeof(struct ipv6hdr) + payload_len;
2150
2151     rcu_read_lock();
2152     IP6_UPD_PO_STATS(net, __in6_dev_get(dev),
2153               IPSTATS_MIB_OUT, full_len);
2154     rcu_read_unlock();
2155
2156     skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
2157
2158     if (!skb) {
2159         rcu_read_lock();
2160         IP6_INC_STATS(net, __in6_dev_get(dev),
2161                   IPSTATS_MIB_OUTDISCARDS);
2162         rcu_read_unlock();
2163         return;
2164     }
2165     skb->priority = TC_PRIO_CONTROL;
2166     skb_reserve(skb, hlen);
2167
2168     if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
2169         /* <draft-ietf-magma-mld-source-05.txt>:
2170          * use unspecified address as the source address
2171          * when a valid link-local address is not available.
2172          */
2173         saddr = &in6addr_any;
2174     } else
2175         saddr = &addr_buf;
2176
2177     ip6_mc_hdr(sk, skb, dev, saddr, snd_addr, NEXTHDR_HOP, payload_len);
2178
2179     skb_put_data(skb, ra, sizeof(ra));
2180
2181     hdr = skb_put_zero(skb, sizeof(struct mld_msg));
2182     hdr->mld_type = type;
2183     hdr->mld_mca = *addr;
2184
2185     hdr->mld_cksum = csum_ipv6_magic(saddr, snd_addr, len,
2186                      IPPROTO_ICMPV6,
2187                      csum_partial(hdr, len, 0));
2188
2189     rcu_read_lock();
2190     idev = __in6_dev_get(skb->dev);
2191
2192     icmpv6_flow_init(sk, &fl6, type,
2193              &ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
2194              skb->dev->ifindex);
2195     dst = icmp6_dst_alloc(skb->dev, &fl6);
2196     if (IS_ERR(dst)) {
2197         err = PTR_ERR(dst);
2198         goto err_out;
2199     }
2200
2201     skb_dst_set(skb, dst);
2202     err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
2203               net, sk, skb, NULL, skb->dev,
2204               dst_output);
2205 out:
2206     if (!err) {
2207         ICMP6MSGOUT_INC_STATS(net, idev, type);
2208         ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);
2209     } else
2210         IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
2211
2212     rcu_read_unlock();
2213     return;
2214
2215 err_out:
2216     kfree_skb(skb);
2217     goto out;
2218 }
2219
2220 /* called with mc_lock */
2221 static void mld_send_initial_cr(struct inet6_dev *idev)
2222 {
2223     struct sk_buff *skb;
2224     struct ifmcaddr6 *pmc;
2225     int type;
2226
2227     if (mld_in_v1_mode(idev))
2228         return;
2229
2230     skb = NULL;
2231     for_each_mc_mclock(idev, pmc) {
2232         if (pmc->mca_sfcount[MCAST_EXCLUDE])
2233             type = MLD2_CHANGE_TO_EXCLUDE;
2234         else
2235             type = MLD2_ALLOW_NEW_SOURCES;
2236         skb = add_grec(skb, pmc, type, 0, 0, 1);
2237     }
2238     if (skb)
2239         mld_sendpack(skb);
2240 }
2241
2242 void ipv6_mc_dad_complete(struct inet6_dev *idev)
2243 {
2244     mutex_lock(&idev->mc_lock);
2245     idev->mc_dad_count = idev->mc_qrv;
2246     if (idev->mc_dad_count) {
2247         mld_send_initial_cr(idev);
2248         idev->mc_dad_count--;
2249         if (idev->mc_dad_count)
2250             mld_dad_start_work(idev,
2251                        unsolicited_report_interval(idev));
2252     }
2253     mutex_unlock(&idev->mc_lock);
2254 }
2255
2256 static void mld_dad_work(struct work_struct *work)
2257 {
2258     struct inet6_dev *idev = container_of(to_delayed_work(work),
2259                           struct inet6_dev,
2260                           mc_dad_work);
2261     mutex_lock(&idev->mc_lock);
2262     mld_send_initial_cr(idev);
2263     if (idev->mc_dad_count) {
2264         idev->mc_dad_count--;
2265         if (idev->mc_dad_count)
2266             mld_dad_start_work(idev,
2267                        unsolicited_report_interval(idev));
2268     }
2269     mutex_unlock(&idev->mc_lock);
2270     in6_dev_put(idev);
2271 }
2272
2273 /* called with mc_lock */
2274 static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
2275     const struct in6_addr *psfsrc)
2276 {
2277     struct ip6_sf_list *psf, *psf_prev;
2278     int rv = 0;
2279
2280     psf_prev = NULL;
2281     for_each_psf_mclock(pmc, psf) {
2282         if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2283             break;
2284         psf_prev = psf;
2285     }
2286     if (!psf || psf->sf_count[sfmode] == 0) {
2287         /* source filter not found, or count wrong =>  bug */
2288         return -ESRCH;
2289     }
2290     psf->sf_count[sfmode]--;
2291     if (!psf->sf_count[MCAST_INCLUDE] && !psf->sf_count[MCAST_EXCLUDE]) {
2292         struct inet6_dev *idev = pmc->idev;
2293
2294         /* no more filters for this source */
2295         if (psf_prev)
2296             rcu_assign_pointer(psf_prev->sf_next,
2297                        mc_dereference(psf->sf_next, idev));
2298         else
2299             rcu_assign_pointer(pmc->mca_sources,
2300                        mc_dereference(psf->sf_next, idev));
2301
2302         if (psf->sf_oldin && !(pmc->mca_flags & MAF_NOREPORT) &&
2303             !mld_in_v1_mode(idev)) {
2304             psf->sf_crcount = idev->mc_qrv;
2305             rcu_assign_pointer(psf->sf_next,
2306                        mc_dereference(pmc->mca_tomb, idev));
2307             rcu_assign_pointer(pmc->mca_tomb, psf);
2308             rv = 1;
2309         } else {
2310             kfree_rcu(psf, rcu);
2311         }
2312     }
2313     return rv;
2314 }
2315
2316 /* called with mc_lock */
2317 static int ip6_mc_del_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2318               int sfmode, int sfcount, const struct in6_addr *psfsrc,
2319               int delta)
2320 {
2321     struct ifmcaddr6 *pmc;
2322     int changerec = 0;
2323     int i, err;
2324
2325     if (!idev)
2326         return -ENODEV;
2327
2328     for_each_mc_mclock(idev, pmc) {
2329         if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2330             break;
2331     }
2332     if (!pmc)
2333         return -ESRCH;
2334
2335     sf_markstate(pmc);
2336     if (!delta) {
2337         if (!pmc->mca_sfcount[sfmode])
2338             return -EINVAL;
2339
2340         pmc->mca_sfcount[sfmode]--;
2341     }
2342     err = 0;
2343     for (i = 0; i < sfcount; i++) {
2344         int rv = ip6_mc_del1_src(pmc, sfmode, &psfsrc[i]);
2345
2346         changerec |= rv > 0;
2347         if (!err && rv < 0)
2348             err = rv;
2349     }
2350     if (pmc->mca_sfmode == MCAST_EXCLUDE &&
2351         pmc->mca_sfcount[MCAST_EXCLUDE] == 0 &&
2352         pmc->mca_sfcount[MCAST_INCLUDE]) {
2353         struct ip6_sf_list *psf;
2354
2355         /* filter mode change */
2356         pmc->mca_sfmode = MCAST_INCLUDE;
2357         pmc->mca_crcount = idev->mc_qrv;
2358         idev->mc_ifc_count = pmc->mca_crcount;
2359         for_each_psf_mclock(pmc, psf)
2360             psf->sf_crcount = 0;
2361         mld_ifc_event(pmc->idev);
2362     } else if (sf_setstate(pmc) || changerec) {
2363         mld_ifc_event(pmc->idev);
2364     }
2365
2366     return err;
2367 }
2368
2369 /*
2370  * Add multicast single-source filter to the interface list
2371  * called with mc_lock
2372  */
2373 static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
2374     const struct in6_addr *psfsrc)
2375 {
2376     struct ip6_sf_list *psf, *psf_prev;
2377
2378     psf_prev = NULL;
2379     for_each_psf_mclock(pmc, psf) {
2380         if (ipv6_addr_equal(&psf->sf_addr, psfsrc))
2381             break;
2382         psf_prev = psf;
2383     }
2384     if (!psf) {
2385         psf = kzalloc(sizeof(*psf), GFP_KERNEL);
2386         if (!psf)
2387             return -ENOBUFS;
2388
2389         psf->sf_addr = *psfsrc;
2390         if (psf_prev) {
2391             rcu_assign_pointer(psf_prev->sf_next, psf);
2392         } else {
2393             rcu_assign_pointer(pmc->mca_sources, psf);
2394         }
2395     }
2396     psf->sf_count[sfmode]++;
2397     return 0;
2398 }
2399
2400 /* called with mc_lock */
2401 static void sf_markstate(struct ifmcaddr6 *pmc)
2402 {
2403     struct ip6_sf_list *psf;
2404     int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2405
2406     for_each_psf_mclock(pmc, psf) {
2407         if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2408             psf->sf_oldin = mca_xcount ==
2409                 psf->sf_count[MCAST_EXCLUDE] &&
2410                 !psf->sf_count[MCAST_INCLUDE];
2411         } else {
2412             psf->sf_oldin = psf->sf_count[MCAST_INCLUDE] != 0;
2413         }
2414     }
2415 }
2416
2417 /* called with mc_lock */
2418 static int sf_setstate(struct ifmcaddr6 *pmc)
2419 {
2420     struct ip6_sf_list *psf, *dpsf;
2421     int mca_xcount = pmc->mca_sfcount[MCAST_EXCLUDE];
2422     int qrv = pmc->idev->mc_qrv;
2423     int new_in, rv;
2424
2425     rv = 0;
2426     for_each_psf_mclock(pmc, psf) {
2427         if (pmc->mca_sfcount[MCAST_EXCLUDE]) {
2428             new_in = mca_xcount == psf->sf_count[MCAST_EXCLUDE] &&
2429                 !psf->sf_count[MCAST_INCLUDE];
2430         } else
2431             new_in = psf->sf_count[MCAST_INCLUDE] != 0;
2432         if (new_in) {
2433             if (!psf->sf_oldin) {
2434                 struct ip6_sf_list *prev = NULL;
2435
2436                 for_each_psf_tomb(pmc, dpsf) {
2437                     if (ipv6_addr_equal(&dpsf->sf_addr,
2438                         &psf->sf_addr))
2439                         break;
2440                     prev = dpsf;
2441                 }
2442                 if (dpsf) {
2443                     if (prev)
2444                         rcu_assign_pointer(prev->sf_next,
2445                                    mc_dereference(dpsf->sf_next,
2446                                           pmc->idev));
2447                     else
2448                         rcu_assign_pointer(pmc->mca_tomb,
2449                                    mc_dereference(dpsf->sf_next,
2450                                           pmc->idev));
2451                     kfree_rcu(dpsf, rcu);
2452                 }
2453                 psf->sf_crcount = qrv;
2454                 rv++;
2455             }
2456         } else if (psf->sf_oldin) {
2457             psf->sf_crcount = 0;
2458             /*
2459              * add or update "delete" records if an active filter
2460              * is now inactive
2461              */
2462
2463             for_each_psf_tomb(pmc, dpsf)
2464                 if (ipv6_addr_equal(&dpsf->sf_addr,
2465                     &psf->sf_addr))
2466                     break;
2467             if (!dpsf) {
2468                 dpsf = kmalloc(sizeof(*dpsf), GFP_KERNEL);
2469                 if (!dpsf)
2470                     continue;
2471                 *dpsf = *psf;
2472                 rcu_assign_pointer(dpsf->sf_next,
2473                            mc_dereference(pmc->mca_tomb, pmc->idev));
2474                 rcu_assign_pointer(pmc->mca_tomb, dpsf);
2475             }
2476             dpsf->sf_crcount = qrv;
2477             rv++;
2478         }
2479     }
2480     return rv;
2481 }
2482
2483 /*
2484  * Add multicast source filter list to the interface list
2485  * called with mc_lock
2486  */
2487 static int ip6_mc_add_src(struct inet6_dev *idev, const struct in6_addr *pmca,
2488               int sfmode, int sfcount, const struct in6_addr *psfsrc,
2489               int delta)
2490 {
2491     struct ifmcaddr6 *pmc;
2492     int isexclude;
2493     int i, err;
2494
2495     if (!idev)
2496         return -ENODEV;
2497
2498     for_each_mc_mclock(idev, pmc) {
2499         if (ipv6_addr_equal(pmca, &pmc->mca_addr))
2500             break;
2501     }
2502     if (!pmc)
2503         return -ESRCH;
2504
2505     sf_markstate(pmc);
2506     isexclude = pmc->mca_sfmode == MCAST_EXCLUDE;
2507     if (!delta)
2508         pmc->mca_sfcount[sfmode]++;
2509     err = 0;
2510     for (i = 0; i < sfcount; i++) {
2511         err = ip6_mc_add1_src(pmc, sfmode, &psfsrc[i]);
2512         if (err)
2513             break;
2514     }
2515     if (err) {
2516         int j;
2517
2518         if (!delta)
2519             pmc->mca_sfcount[sfmode]--;
2520         for (j = 0; j < i; j++)
2521             ip6_mc_del1_src(pmc, sfmode, &psfsrc[j]);
2522     } else if (isexclude != (pmc->mca_sfcount[MCAST_EXCLUDE] != 0)) {
2523         struct ip6_sf_list *psf;
2524
2525         /* filter mode change */
2526         if (pmc->mca_sfcount[MCAST_EXCLUDE])
2527             pmc->mca_sfmode = MCAST_EXCLUDE;
2528         else if (pmc->mca_sfcount[MCAST_INCLUDE])
2529             pmc->mca_sfmode = MCAST_INCLUDE;
2530         /* else no filters; keep old mode for reports */
2531
2532         pmc->mca_crcount = idev->mc_qrv;
2533         idev->mc_ifc_count = pmc->mca_crcount;
2534         for_each_psf_mclock(pmc, psf)
2535             psf->sf_crcount = 0;
2536         mld_ifc_event(idev);
2537     } else if (sf_setstate(pmc)) {
2538         mld_ifc_event(idev);
2539     }
2540     return err;
2541 }
2542
2543 /* called with mc_lock */
2544 static void ip6_mc_clear_src(struct ifmcaddr6 *pmc)
2545 {
2546     struct ip6_sf_list *psf, *nextpsf;
2547
2548     for (psf = mc_dereference(pmc->mca_tomb, pmc->idev);
2549          psf;
2550          psf = nextpsf) {
2551         nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2552         kfree_rcu(psf, rcu);
2553     }
2554     RCU_INIT_POINTER(pmc->mca_tomb, NULL);
2555     for (psf = mc_dereference(pmc->mca_sources, pmc->idev);
2556          psf;
2557          psf = nextpsf) {
2558         nextpsf = mc_dereference(psf->sf_next, pmc->idev);
2559         kfree_rcu(psf, rcu);
2560     }
2561     RCU_INIT_POINTER(pmc->mca_sources, NULL);
2562     pmc->mca_sfmode = MCAST_EXCLUDE;
2563     pmc->mca_sfcount[MCAST_INCLUDE] = 0;
2564     pmc->mca_sfcount[MCAST_EXCLUDE] = 1;
2565 }
2566
2567 /* called with mc_lock */
2568 static void igmp6_join_group(struct ifmcaddr6 *ma)
2569 {
2570     unsigned long delay;
2571
2572     if (ma->mca_flags & MAF_NOREPORT)
2573         return;
2574
2575     igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2576
2577     delay = prandom_u32() % unsolicited_report_interval(ma->idev);
2578
2579     if (cancel_delayed_work(&ma->mca_work)) {
2580         refcount_dec(&ma->mca_refcnt);
2581         delay = ma->mca_work.timer.expires - jiffies;
2582     }
2583
2584     if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
2585         refcount_inc(&ma->mca_refcnt);
2586     ma->mca_flags |= MAF_TIMER_RUNNING | MAF_LAST_REPORTER;
2587 }
2588
2589 static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
2590                 struct inet6_dev *idev)
2591 {
2592     struct ip6_sf_socklist *psl;
2593     int err;
2594
2595     psl = sock_dereference(iml->sflist, sk);
2596
2597     if (idev)
2598         mutex_lock(&idev->mc_lock);
2599
2600     if (!psl) {
2601         /* any-source empty exclude case */
2602         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
2603     } else {
2604         err = ip6_mc_del_src(idev, &iml->addr, iml->sfmode,
2605                      psl->sl_count, psl->sl_addr, 0);
2606         RCU_INIT_POINTER(iml->sflist, NULL);
2607         atomic_sub(struct_size(psl, sl_addr, psl->sl_max),
2608                &sk->sk_omem_alloc);
2609         kfree_rcu(psl, rcu);
2610     }
2611
2612     if (idev)
2613         mutex_unlock(&idev->mc_lock);
2614
2615     return err;
2616 }
2617
2618 /* called with mc_lock */
2619 static void igmp6_leave_group(struct ifmcaddr6 *ma)
2620 {
2621     if (mld_in_v1_mode(ma->idev)) {
2622         if (ma->mca_flags & MAF_LAST_REPORTER) {
2623             igmp6_send(&ma->mca_addr, ma->idev->dev,
2624                 ICMPV6_MGM_REDUCTION);
2625         }
2626     } else {
2627         mld_add_delrec(ma->idev, ma);
2628         mld_ifc_event(ma->idev);
2629     }
2630 }
2631
2632 static void mld_gq_work(struct work_struct *work)
2633 {
2634     struct inet6_dev *idev = container_of(to_delayed_work(work),
2635                           struct inet6_dev,
2636                           mc_gq_work);
2637
2638     mutex_lock(&idev->mc_lock);
2639     mld_send_report(idev, NULL);
2640     idev->mc_gq_running = 0;
2641     mutex_unlock(&idev->mc_lock);
2642
2643     in6_dev_put(idev);
2644 }
2645
2646 static void mld_ifc_work(struct work_struct *work)
2647 {
2648     struct inet6_dev *idev = container_of(to_delayed_work(work),
2649                           struct inet6_dev,
2650                           mc_ifc_work);
2651
2652     mutex_lock(&idev->mc_lock);
2653     mld_send_cr(idev);
2654
2655     if (idev->mc_ifc_count) {
2656         idev->mc_ifc_count--;
2657         if (idev->mc_ifc_count)
2658             mld_ifc_start_work(idev,
2659                        unsolicited_report_interval(idev));
2660     }
2661     mutex_unlock(&idev->mc_lock);
2662     in6_dev_put(idev);
2663 }
2664
2665 /* called with mc_lock */
2666 static void mld_ifc_event(struct inet6_dev *idev)
2667 {
2668     if (mld_in_v1_mode(idev))
2669         return;
2670
2671     idev->mc_ifc_count = idev->mc_qrv;
2672     mld_ifc_start_work(idev, 1);
2673 }
2674
2675 static void mld_mca_work(struct work_struct *work)
2676 {
2677     struct ifmcaddr6 *ma = container_of(to_delayed_work(work),
2678                         struct ifmcaddr6, mca_work);
2679
2680     mutex_lock(&ma->idev->mc_lock);
2681     if (mld_in_v1_mode(ma->idev))
2682         igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
2683     else
2684         mld_send_report(ma->idev, ma);
2685     ma->mca_flags |=  MAF_LAST_REPORTER;
2686     ma->mca_flags &= ~MAF_TIMER_RUNNING;
2687     mutex_unlock(&ma->idev->mc_lock);
2688
2689     ma_put(ma);
2690 }
2691
2692 /* Device changing type */
2693
2694 void ipv6_mc_unmap(struct inet6_dev *idev)
2695 {
2696     struct ifmcaddr6 *i;
2697
2698     /* Install multicast list, except for all-nodes (already installed) */
2699
2700     mutex_lock(&idev->mc_lock);
2701     for_each_mc_mclock(idev, i)
2702         igmp6_group_dropped(i);
2703     mutex_unlock(&idev->mc_lock);
2704 }
2705
2706 void ipv6_mc_remap(struct inet6_dev *idev)
2707 {
2708     ipv6_mc_up(idev);
2709 }
2710
2711 /* Device going down */
2712 void ipv6_mc_down(struct inet6_dev *idev)
2713 {
2714     struct ifmcaddr6 *i;
2715
2716     mutex_lock(&idev->mc_lock);
2717     /* Withdraw multicast list */
2718     for_each_mc_mclock(idev, i)
2719         igmp6_group_dropped(i);
2720     mutex_unlock(&idev->mc_lock);
2721
2722     /* Should stop work after group drop. or we will
2723      * start work again in mld_ifc_event()
2724      */
2725     synchronize_net();
2726     mld_query_stop_work(idev);
2727     mld_report_stop_work(idev);
2728     mld_ifc_stop_work(idev);
2729     mld_gq_stop_work(idev);
2730     mld_dad_stop_work(idev);
2731 }
2732
2733 static void ipv6_mc_reset(struct inet6_dev *idev)
2734 {
2735     idev->mc_qrv = sysctl_mld_qrv;
2736     idev->mc_qi = MLD_QI_DEFAULT;
2737     idev->mc_qri = MLD_QRI_DEFAULT;
2738     idev->mc_v1_seen = 0;
2739     idev->mc_maxdelay = unsolicited_report_interval(idev);
2740 }
2741
2742 /* Device going up */
2743
2744 void ipv6_mc_up(struct inet6_dev *idev)
2745 {
2746     struct ifmcaddr6 *i;
2747
2748     /* Install multicast list, except for all-nodes (already installed) */
2749
2750     ipv6_mc_reset(idev);
2751     mutex_lock(&idev->mc_lock);
2752     for_each_mc_mclock(idev, i) {
2753         mld_del_delrec(idev, i);
2754         igmp6_group_added(i);
2755     }
2756     mutex_unlock(&idev->mc_lock);
2757 }
2758
2759 /* IPv6 device initialization. */
2760
2761 void ipv6_mc_init_dev(struct inet6_dev *idev)
2762 {
2763     idev->mc_gq_running = 0;
2764     INIT_DELAYED_WORK(&idev->mc_gq_work, mld_gq_work);
2765     RCU_INIT_POINTER(idev->mc_tomb, NULL);
2766     idev->mc_ifc_count = 0;
2767     INIT_DELAYED_WORK(&idev->mc_ifc_work, mld_ifc_work);
2768     INIT_DELAYED_WORK(&idev->mc_dad_work, mld_dad_work);
2769     INIT_DELAYED_WORK(&idev->mc_query_work, mld_query_work);
2770     INIT_DELAYED_WORK(&idev->mc_report_work, mld_report_work);
2771     skb_queue_head_init(&idev->mc_query_queue);
2772     skb_queue_head_init(&idev->mc_report_queue);
2773     spin_lock_init(&idev->mc_query_lock);
2774     spin_lock_init(&idev->mc_report_lock);
2775     mutex_init(&idev->mc_lock);
2776     ipv6_mc_reset(idev);
2777 }
2778
2779 /*
2780  *  Device is about to be destroyed: clean up.
2781  */
2782
2783 void ipv6_mc_destroy_dev(struct inet6_dev *idev)
2784 {
2785     struct ifmcaddr6 *i;
2786
2787     /* Deactivate works */
2788     ipv6_mc_down(idev);
2789     mutex_lock(&idev->mc_lock);
2790     mld_clear_delrec(idev);
2791     mutex_unlock(&idev->mc_lock);
2792     mld_clear_query(idev);
2793     mld_clear_report(idev);
2794
2795     /* Delete all-nodes address. */
2796     /* We cannot call ipv6_dev_mc_dec() directly, our caller in
2797      * addrconf.c has NULL'd out dev->ip6_ptr so in6_dev_get() will
2798      * fail.
2799      */
2800     __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allnodes);
2801
2802     if (idev->cnf.forwarding)
2803         __ipv6_dev_mc_dec(idev, &in6addr_linklocal_allrouters);
2804
2805     mutex_lock(&idev->mc_lock);
2806     while ((i = mc_dereference(idev->mc_list, idev))) {
2807         rcu_assign_pointer(idev->mc_list, mc_dereference(i->next, idev));
2808
2809         ip6_mc_clear_src(i);
2810         ma_put(i);
2811     }
2812     mutex_unlock(&idev->mc_lock);
2813 }
2814
2815 static void ipv6_mc_rejoin_groups(struct inet6_dev *idev)
2816 {
2817     struct ifmcaddr6 *pmc;
2818
2819     ASSERT_RTNL();
2820
2821     mutex_lock(&idev->mc_lock);
2822     if (mld_in_v1_mode(idev)) {
2823         for_each_mc_mclock(idev, pmc)
2824             igmp6_join_group(pmc);
2825     } else {
2826         mld_send_report(idev, NULL);
2827     }
2828     mutex_unlock(&idev->mc_lock);
2829 }
2830
2831 static int ipv6_mc_netdev_event(struct notifier_block *this,
2832                 unsigned long event,
2833                 void *ptr)
2834 {
2835     struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2836     struct inet6_dev *idev = __in6_dev_get(dev);
2837
2838     switch (event) {
2839     case NETDEV_RESEND_IGMP:
2840         if (idev)
2841             ipv6_mc_rejoin_groups(idev);
2842         break;
2843     default:
2844         break;
2845     }
2846
2847     return NOTIFY_DONE;
2848 }
2849
2850 static struct notifier_block igmp6_netdev_notifier = {
2851     .notifier_call = ipv6_mc_netdev_event,
2852 };
2853
2854 #ifdef CONFIG_PROC_FS
2855 struct igmp6_mc_iter_state {
2856     struct seq_net_private p;
2857     struct net_device *dev;
2858     struct inet6_dev *idev;
2859 };
2860
2861 #define igmp6_mc_seq_private(seq)   ((struct igmp6_mc_iter_state *)(seq)->private)
2862
2863 static inline struct ifmcaddr6 *igmp6_mc_get_first(struct seq_file *seq)
2864 {
2865     struct ifmcaddr6 *im = NULL;
2866     struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2867     struct net *net = seq_file_net(seq);
2868
2869     state->idev = NULL;
2870     for_each_netdev_rcu(net, state->dev) {
2871         struct inet6_dev *idev;
2872         idev = __in6_dev_get(state->dev);
2873         if (!idev)
2874             continue;
2875
2876         im = rcu_dereference(idev->mc_list);
2877         if (im) {
2878             state->idev = idev;
2879             break;
2880         }
2881     }
2882     return im;
2883 }
2884
2885 static struct ifmcaddr6 *igmp6_mc_get_next(struct seq_file *seq, struct ifmcaddr6 *im)
2886 {
2887     struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2888
2889     im = rcu_dereference(im->next);
2890     while (!im) {
2891         state->dev = next_net_device_rcu(state->dev);
2892         if (!state->dev) {
2893             state->idev = NULL;
2894             break;
2895         }
2896         state->idev = __in6_dev_get(state->dev);
2897         if (!state->idev)
2898             continue;
2899         im = rcu_dereference(state->idev->mc_list);
2900     }
2901     return im;
2902 }
2903
2904 static struct ifmcaddr6 *igmp6_mc_get_idx(struct seq_file *seq, loff_t pos)
2905 {
2906     struct ifmcaddr6 *im = igmp6_mc_get_first(seq);
2907     if (im)
2908         while (pos && (im = igmp6_mc_get_next(seq, im)) != NULL)
2909             --pos;
2910     return pos ? NULL : im;
2911 }
2912
2913 static void *igmp6_mc_seq_start(struct seq_file *seq, loff_t *pos)
2914     __acquires(RCU)
2915 {
2916     rcu_read_lock();
2917     return igmp6_mc_get_idx(seq, *pos);
2918 }
2919
2920 static void *igmp6_mc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2921 {
2922     struct ifmcaddr6 *im = igmp6_mc_get_next(seq, v);
2923
2924     ++*pos;
2925     return im;
2926 }
2927
2928 static void igmp6_mc_seq_stop(struct seq_file *seq, void *v)
2929     __releases(RCU)
2930 {
2931     struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2932
2933     if (likely(state->idev))
2934         state->idev = NULL;
2935     state->dev = NULL;
2936     rcu_read_unlock();
2937 }
2938
2939 static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
2940 {
2941     struct ifmcaddr6 *im = (struct ifmcaddr6 *)v;
2942     struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
2943
2944     seq_printf(seq,
2945            "%-4d %-15s %pi6 %5d %08X %ld\n",
2946            state->dev->ifindex, state->dev->name,
2947            &im->mca_addr,
2948            im->mca_users, im->mca_flags,
2949            (im->mca_flags & MAF_TIMER_RUNNING) ?
2950            jiffies_to_clock_t(im->mca_work.timer.expires - jiffies) : 0);
2951     return 0;
2952 }
2953
2954 static const struct seq_operations igmp6_mc_seq_ops = {
2955     .start  =   igmp6_mc_seq_start,
2956     .next   =   igmp6_mc_seq_next,
2957     .stop   =   igmp6_mc_seq_stop,
2958     .show   =   igmp6_mc_seq_show,
2959 };
2960
2961 struct igmp6_mcf_iter_state {
2962     struct seq_net_private p;
2963     struct net_device *dev;
2964     struct inet6_dev *idev;
2965     struct ifmcaddr6 *im;
2966 };
2967
2968 #define igmp6_mcf_seq_private(seq)  ((struct igmp6_mcf_iter_state *)(seq)->private)
2969
2970 static inline struct ip6_sf_list *igmp6_mcf_get_first(struct seq_file *seq)
2971 {
2972     struct ip6_sf_list *psf = NULL;
2973     struct ifmcaddr6 *im = NULL;
2974     struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
2975     struct net *net = seq_file_net(seq);
2976
2977     state->idev = NULL;
2978     state->im = NULL;
2979     for_each_netdev_rcu(net, state->dev) {
2980         struct inet6_dev *idev;
2981         idev = __in6_dev_get(state->dev);
2982         if (unlikely(idev == NULL))
2983             continue;
2984
2985         im = rcu_dereference(idev->mc_list);
2986         if (likely(im)) {
2987             psf = rcu_dereference(im->mca_sources);
2988             if (likely(psf)) {
2989                 state->im = im;
2990                 state->idev = idev;
2991                 break;
2992             }
2993         }
2994     }
2995     return psf;
2996 }
2997
2998 static struct ip6_sf_list *igmp6_mcf_get_next(struct seq_file *seq, struct ip6_sf_list *psf)
2999 {
3000     struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3001
3002     psf = rcu_dereference(psf->sf_next);
3003     while (!psf) {
3004         state->im = rcu_dereference(state->im->next);
3005         while (!state->im) {
3006             state->dev = next_net_device_rcu(state->dev);
3007             if (!state->dev) {
3008                 state->idev = NULL;
3009                 goto out;
3010             }
3011             state->idev = __in6_dev_get(state->dev);
3012             if (!state->idev)
3013                 continue;
3014             state->im = rcu_dereference(state->idev->mc_list);
3015         }
3016         if (!state->im)
3017             break;
3018         psf = rcu_dereference(state->im->mca_sources);
3019     }
3020 out:
3021     return psf;
3022 }
3023
3024 static struct ip6_sf_list *igmp6_mcf_get_idx(struct seq_file *seq, loff_t pos)
3025 {
3026     struct ip6_sf_list *psf = igmp6_mcf_get_first(seq);
3027     if (psf)
3028         while (pos && (psf = igmp6_mcf_get_next(seq, psf)) != NULL)
3029             --pos;
3030     return pos ? NULL : psf;
3031 }
3032
3033 static void *igmp6_mcf_seq_start(struct seq_file *seq, loff_t *pos)
3034     __acquires(RCU)
3035 {
3036     rcu_read_lock();
3037     return *pos ? igmp6_mcf_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
3038 }
3039
3040 static void *igmp6_mcf_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3041 {
3042     struct ip6_sf_list *psf;
3043     if (v == SEQ_START_TOKEN)
3044         psf = igmp6_mcf_get_first(seq);
3045     else
3046         psf = igmp6_mcf_get_next(seq, v);
3047     ++*pos;
3048     return psf;
3049 }
3050
3051 static void igmp6_mcf_seq_stop(struct seq_file *seq, void *v)
3052     __releases(RCU)
3053 {
3054     struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3055
3056     if (likely(state->im))
3057         state->im = NULL;
3058     if (likely(state->idev))
3059         state->idev = NULL;
3060
3061     state->dev = NULL;
3062     rcu_read_unlock();
3063 }
3064
3065 static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
3066 {
3067     struct ip6_sf_list *psf = (struct ip6_sf_list *)v;
3068     struct igmp6_mcf_iter_state *state = igmp6_mcf_seq_private(seq);
3069
3070     if (v == SEQ_START_TOKEN) {
3071         seq_puts(seq, "Idx Device                Multicast Address                   Source Address    INC    EXC\n");
3072     } else {
3073         seq_printf(seq,
3074                "%3d %6.6s %pi6 %pi6 %6lu %6lu\n",
3075                state->dev->ifindex, state->dev->name,
3076                &state->im->mca_addr,
3077                &psf->sf_addr,
3078                psf->sf_count[MCAST_INCLUDE],
3079                psf->sf_count[MCAST_EXCLUDE]);
3080     }
3081     return 0;
3082 }
3083
3084 static const struct seq_operations igmp6_mcf_seq_ops = {
3085     .start  =   igmp6_mcf_seq_start,
3086     .next   =   igmp6_mcf_seq_next,
3087     .stop   =   igmp6_mcf_seq_stop,
3088     .show   =   igmp6_mcf_seq_show,
3089 };
3090
3091 static int __net_init igmp6_proc_init(struct net *net)
3092 {
3093     int err;
3094
3095     err = -ENOMEM;
3096     if (!proc_create_net("igmp6", 0444, net->proc_net, &igmp6_mc_seq_ops,
3097             sizeof(struct igmp6_mc_iter_state)))
3098         goto out;
3099     if (!proc_create_net("mcfilter6", 0444, net->proc_net,
3100             &igmp6_mcf_seq_ops,
3101             sizeof(struct igmp6_mcf_iter_state)))
3102         goto out_proc_net_igmp6;
3103
3104     err = 0;
3105 out:
3106     return err;
3107
3108 out_proc_net_igmp6:
3109     remove_proc_entry("igmp6", net->proc_net);
3110     goto out;
3111 }
3112
3113 static void __net_exit igmp6_proc_exit(struct net *net)
3114 {
3115     remove_proc_entry("mcfilter6", net->proc_net);
3116     remove_proc_entry("igmp6", net->proc_net);
3117 }
3118 #else
3119 static inline int igmp6_proc_init(struct net *net)
3120 {
3121     return 0;
3122 }
3123 static inline void igmp6_proc_exit(struct net *net)
3124 {
3125 }
3126 #endif
3127
3128 static int __net_init igmp6_net_init(struct net *net)
3129 {
3130     int err;
3131
3132     err = inet_ctl_sock_create(&net->ipv6.igmp_sk, PF_INET6,
3133                    SOCK_RAW, IPPROTO_ICMPV6, net);
3134     if (err < 0) {
3135         pr_err("Failed to initialize the IGMP6 control socket (err %d)\n",
3136                err);
3137         goto out;
3138     }
3139
3140     inet6_sk(net->ipv6.igmp_sk)->hop_limit = 1;
3141     net->ipv6.igmp_sk->sk_allocation = GFP_KERNEL;
3142
3143     err = inet_ctl_sock_create(&net->ipv6.mc_autojoin_sk, PF_INET6,
3144                    SOCK_RAW, IPPROTO_ICMPV6, net);
3145     if (err < 0) {
3146         pr_err("Failed to initialize the IGMP6 autojoin socket (err %d)\n",
3147                err);
3148         goto out_sock_create;
3149     }
3150
3151     err = igmp6_proc_init(net);
3152     if (err)
3153         goto out_sock_create_autojoin;
3154
3155     return 0;
3156
3157 out_sock_create_autojoin:
3158     inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3159 out_sock_create:
3160     inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3161 out:
3162     return err;
3163 }
3164
3165 static void __net_exit igmp6_net_exit(struct net *net)
3166 {
3167     inet_ctl_sock_destroy(net->ipv6.igmp_sk);
3168     inet_ctl_sock_destroy(net->ipv6.mc_autojoin_sk);
3169     igmp6_proc_exit(net);
3170 }
3171
3172 static struct pernet_operations igmp6_net_ops = {
3173     .init = igmp6_net_init,
3174     .exit = igmp6_net_exit,
3175 };
3176
3177 int __init igmp6_init(void)
3178 {
3179     int err;
3180
3181     err = register_pernet_subsys(&igmp6_net_ops);
3182     if (err)
3183         return err;
3184
3185     mld_wq = create_workqueue("mld");
3186     if (!mld_wq) {
3187         unregister_pernet_subsys(&igmp6_net_ops);
3188         return -ENOMEM;
3189     }
3190
3191     return err;
3192 }
3193
3194 int __init igmp6_late_init(void)
3195 {
3196     return register_netdevice_notifier(&igmp6_netdev_notifier);
3197 }
3198
3199 void igmp6_cleanup(void)
3200 {
3201     unregister_pernet_subsys(&igmp6_net_ops);
3202     destroy_workqueue(mld_wq);
3203 }
3204
3205 void igmp6_late_cleanup(void)
3206 {
3207     unregister_netdevice_notifier(&igmp6_netdev_notifier);
3208 }