| /* Linux multicast routing support |
| * Common logic shared by IPv4 [ipmr] and IPv6 [ip6mr] implementation |
| */ |
| |
| #include <linux/rhashtable.h> |
| #include <linux/mroute_base.h> |
| |
| /* Sets everything common except 'dev', since that is done under locking */ |
| void vif_device_init(struct vif_device *v, |
| struct net_device *dev, |
| unsigned long rate_limit, |
| unsigned char threshold, |
| unsigned short flags, |
| unsigned short get_iflink_mask) |
| { |
| v->dev = NULL; |
| v->bytes_in = 0; |
| v->bytes_out = 0; |
| v->pkt_in = 0; |
| v->pkt_out = 0; |
| v->rate_limit = rate_limit; |
| v->flags = flags; |
| v->threshold = threshold; |
| if (v->flags & get_iflink_mask) |
| v->link = dev_get_iflink(dev); |
| else |
| v->link = dev->ifindex; |
| } |
| EXPORT_SYMBOL(vif_device_init); |
| |
| struct mr_table * |
| mr_table_alloc(struct net *net, u32 id, |
| struct mr_table_ops *ops, |
| void (*expire_func)(struct timer_list *t), |
| void (*table_set)(struct mr_table *mrt, |
| struct net *net)) |
| { |
| struct mr_table *mrt; |
| int err; |
| |
| mrt = kzalloc(sizeof(*mrt), GFP_KERNEL); |
| if (!mrt) |
| return ERR_PTR(-ENOMEM); |
| mrt->id = id; |
| write_pnet(&mrt->net, net); |
| |
| mrt->ops = *ops; |
| err = rhltable_init(&mrt->mfc_hash, mrt->ops.rht_params); |
| if (err) { |
| kfree(mrt); |
| return ERR_PTR(err); |
| } |
| INIT_LIST_HEAD(&mrt->mfc_cache_list); |
| INIT_LIST_HEAD(&mrt->mfc_unres_queue); |
| |
| timer_setup(&mrt->ipmr_expire_timer, expire_func, 0); |
| |
| mrt->mroute_reg_vif_num = -1; |
| table_set(mrt, net); |
| return mrt; |
| } |
| EXPORT_SYMBOL(mr_table_alloc); |
| |
| void *mr_mfc_find_parent(struct mr_table *mrt, void *hasharg, int parent) |
| { |
| struct rhlist_head *tmp, *list; |
| struct mr_mfc *c; |
| |
| list = rhltable_lookup(&mrt->mfc_hash, hasharg, *mrt->ops.rht_params); |
| rhl_for_each_entry_rcu(c, tmp, list, mnode) |
| if (parent == -1 || parent == c->mfc_parent) |
| return c; |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(mr_mfc_find_parent); |
| |
| void *mr_mfc_find_any_parent(struct mr_table *mrt, int vifi) |
| { |
| struct rhlist_head *tmp, *list; |
| struct mr_mfc *c; |
| |
| list = rhltable_lookup(&mrt->mfc_hash, mrt->ops.cmparg_any, |
| *mrt->ops.rht_params); |
| rhl_for_each_entry_rcu(c, tmp, list, mnode) |
| if (c->mfc_un.res.ttls[vifi] < 255) |
| return c; |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(mr_mfc_find_any_parent); |
| |
| void *mr_mfc_find_any(struct mr_table *mrt, int vifi, void *hasharg) |
| { |
| struct rhlist_head *tmp, *list; |
| struct mr_mfc *c, *proxy; |
| |
| list = rhltable_lookup(&mrt->mfc_hash, hasharg, *mrt->ops.rht_params); |
| rhl_for_each_entry_rcu(c, tmp, list, mnode) { |
| if (c->mfc_un.res.ttls[vifi] < 255) |
| return c; |
| |
| /* It's ok if the vifi is part of the static tree */ |
| proxy = mr_mfc_find_any_parent(mrt, c->mfc_parent); |
| if (proxy && proxy->mfc_un.res.ttls[vifi] < 255) |
| return c; |
| } |
| |
| return mr_mfc_find_any_parent(mrt, vifi); |
| } |
| EXPORT_SYMBOL(mr_mfc_find_any); |
| |
| #ifdef CONFIG_PROC_FS |
| void *mr_vif_seq_idx(struct net *net, struct mr_vif_iter *iter, loff_t pos) |
| { |
| struct mr_table *mrt = iter->mrt; |
| |
| for (iter->ct = 0; iter->ct < mrt->maxvif; ++iter->ct) { |
| if (!VIF_EXISTS(mrt, iter->ct)) |
| continue; |
| if (pos-- == 0) |
| return &mrt->vif_table[iter->ct]; |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL(mr_vif_seq_idx); |
| |
| void *mr_vif_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
| { |
| struct mr_vif_iter *iter = seq->private; |
| struct net *net = seq_file_net(seq); |
| struct mr_table *mrt = iter->mrt; |
| |
| ++*pos; |
| if (v == SEQ_START_TOKEN) |
| return mr_vif_seq_idx(net, iter, 0); |
| |
| while (++iter->ct < mrt->maxvif) { |
| if (!VIF_EXISTS(mrt, iter->ct)) |
| continue; |
| return &mrt->vif_table[iter->ct]; |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL(mr_vif_seq_next); |
| |
| void *mr_mfc_seq_idx(struct net *net, |
| struct mr_mfc_iter *it, loff_t pos) |
| { |
| struct mr_table *mrt = it->mrt; |
| struct mr_mfc *mfc; |
| |
| rcu_read_lock(); |
| it->cache = &mrt->mfc_cache_list; |
| list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) |
| if (pos-- == 0) |
| return mfc; |
| rcu_read_unlock(); |
| |
| spin_lock_bh(it->lock); |
| it->cache = &mrt->mfc_unres_queue; |
| list_for_each_entry(mfc, it->cache, list) |
| if (pos-- == 0) |
| return mfc; |
| spin_unlock_bh(it->lock); |
| |
| it->cache = NULL; |
| return NULL; |
| } |
| EXPORT_SYMBOL(mr_mfc_seq_idx); |
| |
| void *mr_mfc_seq_next(struct seq_file *seq, void *v, |
| loff_t *pos) |
| { |
| struct mr_mfc_iter *it = seq->private; |
| struct net *net = seq_file_net(seq); |
| struct mr_table *mrt = it->mrt; |
| struct mr_mfc *c = v; |
| |
| ++*pos; |
| |
| if (v == SEQ_START_TOKEN) |
| return mr_mfc_seq_idx(net, seq->private, 0); |
| |
| if (c->list.next != it->cache) |
| return list_entry(c->list.next, struct mr_mfc, list); |
| |
| if (it->cache == &mrt->mfc_unres_queue) |
| goto end_of_list; |
| |
| /* exhausted cache_array, show unresolved */ |
| rcu_read_unlock(); |
| it->cache = &mrt->mfc_unres_queue; |
| |
| spin_lock_bh(it->lock); |
| if (!list_empty(it->cache)) |
| return list_first_entry(it->cache, struct mr_mfc, list); |
| |
| end_of_list: |
| spin_unlock_bh(it->lock); |
| it->cache = NULL; |
| |
| return NULL; |
| } |
| EXPORT_SYMBOL(mr_mfc_seq_next); |
| #endif |
| |
| int mr_fill_mroute(struct mr_table *mrt, struct sk_buff *skb, |
| struct mr_mfc *c, struct rtmsg *rtm) |
| { |
| struct rta_mfc_stats mfcs; |
| struct nlattr *mp_attr; |
| struct rtnexthop *nhp; |
| unsigned long lastuse; |
| int ct; |
| |
| /* If cache is unresolved, don't try to parse IIF and OIF */ |
| if (c->mfc_parent >= MAXVIFS) { |
| rtm->rtm_flags |= RTNH_F_UNRESOLVED; |
| return -ENOENT; |
| } |
| |
| if (VIF_EXISTS(mrt, c->mfc_parent) && |
| nla_put_u32(skb, RTA_IIF, |
| mrt->vif_table[c->mfc_parent].dev->ifindex) < 0) |
| return -EMSGSIZE; |
| |
| if (c->mfc_flags & MFC_OFFLOAD) |
| rtm->rtm_flags |= RTNH_F_OFFLOAD; |
| |
| mp_attr = nla_nest_start(skb, RTA_MULTIPATH); |
| if (!mp_attr) |
| return -EMSGSIZE; |
| |
| for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
| struct vif_device *vif; |
| |
| nhp = nla_reserve_nohdr(skb, sizeof(*nhp)); |
| if (!nhp) { |
| nla_nest_cancel(skb, mp_attr); |
| return -EMSGSIZE; |
| } |
| |
| nhp->rtnh_flags = 0; |
| nhp->rtnh_hops = c->mfc_un.res.ttls[ct]; |
| vif = &mrt->vif_table[ct]; |
| nhp->rtnh_ifindex = vif->dev->ifindex; |
| nhp->rtnh_len = sizeof(*nhp); |
| } |
| } |
| |
| nla_nest_end(skb, mp_attr); |
| |
| lastuse = READ_ONCE(c->mfc_un.res.lastuse); |
| lastuse = time_after_eq(jiffies, lastuse) ? jiffies - lastuse : 0; |
| |
| mfcs.mfcs_packets = c->mfc_un.res.pkt; |
| mfcs.mfcs_bytes = c->mfc_un.res.bytes; |
| mfcs.mfcs_wrong_if = c->mfc_un.res.wrong_if; |
| if (nla_put_64bit(skb, RTA_MFC_STATS, sizeof(mfcs), &mfcs, RTA_PAD) || |
| nla_put_u64_64bit(skb, RTA_EXPIRES, jiffies_to_clock_t(lastuse), |
| RTA_PAD)) |
| return -EMSGSIZE; |
| |
| rtm->rtm_type = RTN_MULTICAST; |
| return 1; |
| } |
| EXPORT_SYMBOL(mr_fill_mroute); |
| |
| static bool mr_mfc_uses_dev(const struct mr_table *mrt, |
| const struct mr_mfc *c, |
| const struct net_device *dev) |
| { |
| int ct; |
| |
| for (ct = c->mfc_un.res.minvif; ct < c->mfc_un.res.maxvif; ct++) { |
| if (VIF_EXISTS(mrt, ct) && c->mfc_un.res.ttls[ct] < 255) { |
| const struct vif_device *vif; |
| |
| vif = &mrt->vif_table[ct]; |
| if (vif->dev == dev) |
| return true; |
| } |
| } |
| return false; |
| } |
| |
| int mr_table_dump(struct mr_table *mrt, struct sk_buff *skb, |
| struct netlink_callback *cb, |
| int (*fill)(struct mr_table *mrt, struct sk_buff *skb, |
| u32 portid, u32 seq, struct mr_mfc *c, |
| int cmd, int flags), |
| spinlock_t *lock, struct fib_dump_filter *filter) |
| { |
| unsigned int e = 0, s_e = cb->args[1]; |
| unsigned int flags = NLM_F_MULTI; |
| struct mr_mfc *mfc; |
| int err; |
| |
| if (filter->filter_set) |
| flags |= NLM_F_DUMP_FILTERED; |
| |
| list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) { |
| if (e < s_e) |
| goto next_entry; |
| if (filter->dev && |
| !mr_mfc_uses_dev(mrt, mfc, filter->dev)) |
| goto next_entry; |
| |
| err = fill(mrt, skb, NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, mfc, RTM_NEWROUTE, flags); |
| if (err < 0) |
| goto out; |
| next_entry: |
| e++; |
| } |
| |
| spin_lock_bh(lock); |
| list_for_each_entry(mfc, &mrt->mfc_unres_queue, list) { |
| if (e < s_e) |
| goto next_entry2; |
| if (filter->dev && |
| !mr_mfc_uses_dev(mrt, mfc, filter->dev)) |
| goto next_entry2; |
| |
| err = fill(mrt, skb, NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, mfc, RTM_NEWROUTE, flags); |
| if (err < 0) { |
| spin_unlock_bh(lock); |
| goto out; |
| } |
| next_entry2: |
| e++; |
| } |
| spin_unlock_bh(lock); |
| err = 0; |
| e = 0; |
| |
| out: |
| cb->args[1] = e; |
| return err; |
| } |
| EXPORT_SYMBOL(mr_table_dump); |
| |
| int mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb, |
| struct mr_table *(*iter)(struct net *net, |
| struct mr_table *mrt), |
| int (*fill)(struct mr_table *mrt, |
| struct sk_buff *skb, |
| u32 portid, u32 seq, struct mr_mfc *c, |
| int cmd, int flags), |
| spinlock_t *lock, struct fib_dump_filter *filter) |
| { |
| unsigned int t = 0, s_t = cb->args[0]; |
| struct net *net = sock_net(skb->sk); |
| struct mr_table *mrt; |
| int err; |
| |
| /* multicast does not track protocol or have route type other |
| * than RTN_MULTICAST |
| */ |
| if (filter->filter_set) { |
| if (filter->protocol || filter->flags || |
| (filter->rt_type && filter->rt_type != RTN_MULTICAST)) |
| return skb->len; |
| } |
| |
| rcu_read_lock(); |
| for (mrt = iter(net, NULL); mrt; mrt = iter(net, mrt)) { |
| if (t < s_t) |
| goto next_table; |
| |
| err = mr_table_dump(mrt, skb, cb, fill, lock, filter); |
| if (err < 0) |
| break; |
| next_table: |
| t++; |
| } |
| rcu_read_unlock(); |
| |
| cb->args[0] = t; |
| |
| return skb->len; |
| } |
| EXPORT_SYMBOL(mr_rtm_dumproute); |
| |
| int mr_dump(struct net *net, struct notifier_block *nb, unsigned short family, |
| int (*rules_dump)(struct net *net, |
| struct notifier_block *nb), |
| struct mr_table *(*mr_iter)(struct net *net, |
| struct mr_table *mrt), |
| rwlock_t *mrt_lock) |
| { |
| struct mr_table *mrt; |
| int err; |
| |
| err = rules_dump(net, nb); |
| if (err) |
| return err; |
| |
| for (mrt = mr_iter(net, NULL); mrt; mrt = mr_iter(net, mrt)) { |
| struct vif_device *v = &mrt->vif_table[0]; |
| struct mr_mfc *mfc; |
| int vifi; |
| |
| /* Notifiy on table VIF entries */ |
| read_lock(mrt_lock); |
| for (vifi = 0; vifi < mrt->maxvif; vifi++, v++) { |
| if (!v->dev) |
| continue; |
| |
| mr_call_vif_notifier(nb, net, family, |
| FIB_EVENT_VIF_ADD, |
| v, vifi, mrt->id); |
| } |
| read_unlock(mrt_lock); |
| |
| /* Notify on table MFC entries */ |
| list_for_each_entry_rcu(mfc, &mrt->mfc_cache_list, list) |
| mr_call_mfc_notifier(nb, net, family, |
| FIB_EVENT_ENTRY_ADD, |
| mfc, mrt->id); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(mr_dump); |