diff options
| -rw-r--r-- | drivers/net/amt.c | 1132 | ||||
| -rw-r--r-- | include/net/amt.h | 104 |
2 files changed, 1234 insertions, 2 deletions
diff --git a/drivers/net/amt.c b/drivers/net/amt.c index b4aff24ef271..854d1bfae47d 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -32,6 +32,13 @@ static struct workqueue_struct *amt_wq; +static struct igmpv3_grec igmpv3_zero_grec; + +static HLIST_HEAD(source_gc_list); +/* Lock for source_gc_list */ +static spinlock_t source_gc_lock; +static struct delayed_work source_gc_wq; + static char *status_str[] = { "AMT_STATUS_INIT", "AMT_STATUS_SENT_DISCOVERY", @@ -56,6 +63,15 @@ static char *type_str[] = { "AMT_MSG_TEARDOWM", }; +static char *action_str[] = { + "AMT_ACT_GMI", + "AMT_ACT_GMI_ZERO", + "AMT_ACT_GT", + "AMT_ACT_STATUS_FWD_NEW", + "AMT_ACT_STATUS_D_FWD_NEW", + "AMT_ACT_STATUS_NONE_NEW", +}; + static struct amt_skb_cb *amt_skb_cb(struct sk_buff *skb) { BUILD_BUG_ON(sizeof(struct amt_skb_cb) + sizeof(struct qdisc_skb_cb) > @@ -65,6 +81,400 @@ static struct amt_skb_cb *amt_skb_cb(struct sk_buff *skb) sizeof(struct qdisc_skb_cb)); } +static void __amt_source_gc_work(void) +{ + struct amt_source_node *snode; + struct hlist_head gc_list; + struct hlist_node *t; + + spin_lock_bh(&source_gc_lock); + hlist_move_list(&source_gc_list, &gc_list); + spin_unlock_bh(&source_gc_lock); + + hlist_for_each_entry_safe(snode, t, &gc_list, node) { + hlist_del_rcu(&snode->node); + kfree_rcu(snode, rcu); + } +} + +static void amt_source_gc_work(struct work_struct *work) +{ + __amt_source_gc_work(); + + spin_lock_bh(&source_gc_lock); + mod_delayed_work(amt_wq, &source_gc_wq, + msecs_to_jiffies(AMT_GC_INTERVAL)); + spin_unlock_bh(&source_gc_lock); +} + +static bool amt_addr_equal(union amt_addr *a, union amt_addr *b) +{ + return !memcmp(a, b, sizeof(union amt_addr)); +} + +static u32 amt_source_hash(struct amt_tunnel_list *tunnel, union amt_addr *src) +{ + u32 hash = jhash(src, sizeof(*src), tunnel->amt->hash_seed); + + return reciprocal_scale(hash, tunnel->amt->hash_buckets); +} + +static bool amt_status_filter(struct amt_source_node *snode, + enum amt_filter filter) +{ + bool rc = false; + + switch (filter) { + case AMT_FILTER_FWD: + if (snode->status == AMT_SOURCE_STATUS_FWD && + snode->flags == AMT_SOURCE_OLD) + rc = true; + break; + case AMT_FILTER_D_FWD: + if (snode->status == AMT_SOURCE_STATUS_D_FWD && + snode->flags == AMT_SOURCE_OLD) + rc = true; + break; + case AMT_FILTER_FWD_NEW: + if (snode->status == AMT_SOURCE_STATUS_FWD && + snode->flags == AMT_SOURCE_NEW) + rc = true; + break; + case AMT_FILTER_D_FWD_NEW: + if (snode->status == AMT_SOURCE_STATUS_D_FWD && + snode->flags == AMT_SOURCE_NEW) + rc = true; + break; + case AMT_FILTER_ALL: + rc = true; + break; + case AMT_FILTER_NONE_NEW: + if (snode->status == AMT_SOURCE_STATUS_NONE && + snode->flags == AMT_SOURCE_NEW) + rc = true; + break; + case AMT_FILTER_BOTH: + if ((snode->status == AMT_SOURCE_STATUS_D_FWD || + snode->status == AMT_SOURCE_STATUS_FWD) && + snode->flags == AMT_SOURCE_OLD) + rc = true; + break; + case AMT_FILTER_BOTH_NEW: + if ((snode->status == AMT_SOURCE_STATUS_D_FWD || + snode->status == AMT_SOURCE_STATUS_FWD) && + snode->flags == AMT_SOURCE_NEW) + rc = true; + break; + default: + WARN_ON_ONCE(1); + break; + } + + return rc; +} + +static struct amt_source_node *amt_lookup_src(struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + enum amt_filter filter, + union amt_addr *src) +{ + u32 hash = amt_source_hash(tunnel, src); + struct amt_source_node *snode; + + hlist_for_each_entry_rcu(snode, &gnode->sources[hash], node) + if (amt_status_filter(snode, filter) && + amt_addr_equal(&snode->source_addr, src)) + return snode; + + return NULL; +} + +static u32 amt_group_hash(struct amt_tunnel_list *tunnel, union amt_addr *group) +{ + u32 hash = jhash(group, sizeof(*group), tunnel->amt->hash_seed); + + return reciprocal_scale(hash, tunnel->amt->hash_buckets); +} + +static struct amt_group_node *amt_lookup_group(struct amt_tunnel_list *tunnel, + union amt_addr *group, + union amt_addr *host, + bool v6) +{ + u32 hash = amt_group_hash(tunnel, group); + struct amt_group_node *gnode; + + hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash], node) { + if (amt_addr_equal(&gnode->group_addr, group) && + amt_addr_equal(&gnode->host_addr, host) && + gnode->v6 == v6) + return gnode; + } + + return NULL; +} + +static void amt_destroy_source(struct amt_source_node *snode) +{ + struct amt_group_node *gnode = snode->gnode; + struct amt_tunnel_list *tunnel; + + tunnel = gnode->tunnel_list; + + if (!gnode->v6) { + netdev_dbg(snode->gnode->amt->dev, + "Delete source %pI4 from %pI4\n", + &snode->source_addr.ip4, + &gnode->group_addr.ip4); + } + + cancel_delayed_work(&snode->source_timer); + hlist_del_init_rcu(&snode->node); + tunnel->nr_sources--; + gnode->nr_sources--; + spin_lock_bh(&source_gc_lock); + hlist_add_head_rcu(&snode->node, &source_gc_list); + spin_unlock_bh(&source_gc_lock); +} + +static void amt_del_group(struct amt_dev *amt, struct amt_group_node *gnode) +{ + struct amt_source_node *snode; + struct hlist_node *t; + int i; + + if (cancel_delayed_work(&gnode->group_timer)) + dev_put(amt->dev); + hlist_del_rcu(&gnode->node); + gnode->tunnel_list->nr_groups--; + + if (!gnode->v6) + netdev_dbg(amt->dev, "Leave group %pI4\n", + &gnode->group_addr.ip4); + for (i = 0; i < amt->hash_buckets; i++) + hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) + amt_destroy_source(snode); + + /* tunnel->lock was acquired outside of amt_del_group() + * But rcu_read_lock() was acquired too so It's safe. + */ + kfree_rcu(gnode, rcu); +} + +/* If a source timer expires with a router filter-mode for the group of + * INCLUDE, the router concludes that traffic from this particular + * source is no longer desired on the attached network, and deletes the + * associated source record. + */ +static void amt_source_work(struct work_struct *work) +{ + struct amt_source_node *snode = container_of(to_delayed_work(work), + struct amt_source_node, + source_timer); + struct amt_group_node *gnode = snode->gnode; + struct amt_dev *amt = gnode->amt; + struct amt_tunnel_list *tunnel; + + tunnel = gnode->tunnel_list; + spin_lock_bh(&tunnel->lock); + rcu_read_lock(); + if (gnode->filter_mode == MCAST_INCLUDE) { + amt_destroy_source(snode); + if (!gnode->nr_sources) + amt_del_group(amt, gnode); + } else { + /* When a router filter-mode for a group is EXCLUDE, + * source records are only deleted when the group timer expires + */ + snode->status = AMT_SOURCE_STATUS_D_FWD; + } + rcu_read_unlock(); + spin_unlock_bh(&tunnel->lock); +} + +static void amt_act_src(struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + struct amt_source_node *snode, + enum amt_act act) +{ + struct amt_dev *amt = tunnel->amt; + + switch (act) { + case AMT_ACT_GMI: + mod_delayed_work(amt_wq, &snode->source_timer, + msecs_to_jiffies(amt_gmi(amt))); + break; + case AMT_ACT_GMI_ZERO: + cancel_delayed_work(&snode->source_timer); + break; + case AMT_ACT_GT: + mod_delayed_work(amt_wq, &snode->source_timer, + gnode->group_timer.timer.expires); + break; + case AMT_ACT_STATUS_FWD_NEW: + snode->status = AMT_SOURCE_STATUS_FWD; + snode->flags = AMT_SOURCE_NEW; + break; + case AMT_ACT_STATUS_D_FWD_NEW: + snode->status = AMT_SOURCE_STATUS_D_FWD; + snode->flags = AMT_SOURCE_NEW; + break; + case AMT_ACT_STATUS_NONE_NEW: + cancel_delayed_work(&snode->source_timer); + snode->status = AMT_SOURCE_STATUS_NONE; + snode->flags = AMT_SOURCE_NEW; + break; + default: + WARN_ON_ONCE(1); + return; + } + + if (!gnode->v6) + netdev_dbg(amt->dev, "Source %pI4 from %pI4 Acted %s\n", + &snode->source_addr.ip4, + &gnode->group_addr.ip4, + action_str[act]); +} + +static struct amt_source_node *amt_alloc_snode(struct amt_group_node *gnode, + union amt_addr *src) +{ + struct amt_source_node *snode; + + snode = kzalloc(sizeof(*snode), GFP_ATOMIC); + if (!snode) + return NULL; + + memcpy(&snode->source_addr, src, sizeof(union amt_addr)); + snode->gnode = gnode; + snode->status = AMT_SOURCE_STATUS_NONE; + snode->flags = AMT_SOURCE_NEW; + INIT_HLIST_NODE(&snode->node); + INIT_DELAYED_WORK(&snode->source_timer, amt_source_work); + + return snode; +} + +/* RFC 3810 - 7.2.2. Definition of Filter Timers + * + * Router Mode Filter Timer Actions/Comments + * ----------- ----------------- ---------------- + * + * INCLUDE Not Used All listeners in + * INCLUDE mode. + * + * EXCLUDE Timer > 0 At least one listener + * in EXCLUDE mode. + * + * EXCLUDE Timer == 0 No more listeners in + * EXCLUDE mode for the + * multicast address. + * If the Requested List + * is empty, delete + * Multicast Address + * Record. If not, switch + * to INCLUDE filter mode; + * the sources in the + * Requested List are + * moved to the Include + * List, and the Exclude + * List is deleted. + */ +static void amt_group_work(struct work_struct *work) +{ + struct amt_group_node *gnode = container_of(to_delayed_work(work), + struct amt_group_node, + group_timer); + struct amt_tunnel_list *tunnel = gnode->tunnel_list; + struct amt_dev *amt = gnode->amt; + struct amt_source_node *snode; + bool delete_group = true; + struct hlist_node *t; + int i, buckets; + + buckets = amt->hash_buckets; + + spin_lock_bh(&tunnel->lock); + if (gnode->filter_mode == MCAST_INCLUDE) { + /* Not Used */ + spin_unlock_bh(&tunnel->lock); + goto out; + } + + rcu_read_lock(); + for (i = 0; i < buckets; i++) { + hlist_for_each_entry_safe(snode, t, + &gnode->sources[i], node) { + if (!delayed_work_pending(&snode->source_timer) || + snode->status == AMT_SOURCE_STATUS_D_FWD) { + amt_destroy_source(snode); + } else { + delete_group = false; + snode->status = AMT_SOURCE_STATUS_FWD; + } + } + } + if (delete_group) + amt_del_group(amt, gnode); + else + gnode->filter_mode = MCAST_INCLUDE; + rcu_read_unlock(); + spin_unlock_bh(&tunnel->lock); +out: + dev_put(amt->dev); +} + +/* Non-existant group is created as INCLUDE {empty}: + * + * RFC 3376 - 5.1. Action on Change of Interface State + * + * If no interface state existed for that multicast address before + * the change (i.e., the change consisted of creating a new + * per-interface record), or if no state exists after the change + * (i.e., the change consisted of deleting a per-interface record), + * then the "non-existent" state is considered to have a filter mode + * of INCLUDE and an empty source list. + */ +static struct amt_group_node *amt_add_group(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + union amt_addr *group, + union amt_addr *host, + bool v6) +{ + struct amt_group_node *gnode; + u32 hash; + int i; + + if (tunnel->nr_groups >= amt->max_groups) + return ERR_PTR(-ENOSPC); + + gnode = kzalloc(sizeof(*gnode) + + (sizeof(struct hlist_head) * amt->hash_buckets), + GFP_ATOMIC); + if (unlikely(!gnode)) + return ERR_PTR(-ENOMEM); + + gnode->amt = amt; + gnode->group_addr = *group; + gnode->host_addr = *host; + gnode->v6 = v6; + gnode->tunnel_list = tunnel; + gnode->filter_mode = MCAST_INCLUDE; + INIT_HLIST_NODE(&gnode->node); + INIT_DELAYED_WORK(&gnode->group_timer, amt_group_work); + for (i = 0; i < amt->hash_buckets; i++) + INIT_HLIST_HEAD(&gnode->sources[i]); + + hash = amt_group_hash(tunnel, group); + hlist_add_head_rcu(&gnode->node, &tunnel->groups[hash]); + tunnel->nr_groups++; + + if (!gnode->v6) + netdev_dbg(amt->dev, "Join group %pI4\n", + &gnode->group_addr.ip4); + return gnode; +} + static struct sk_buff *amt_build_igmp_gq(struct amt_dev *amt) { u8 ra[AMT_IPHDR_OPTS] = { IPOPT_RA, 4, 0, 0 }; @@ -611,12 +1021,15 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev) { struct amt_dev *amt = netdev_priv(dev); struct amt_tunnel_list *tunnel; + struct amt_group_node *gnode; + union amt_addr group = {0,}; bool report = false; struct igmphdr *ih; bool query = false; struct iphdr *iph; bool data = false; bool v6 = false; + u32 hash; iph = ip_hdr(skb); if (iph->version == 4) { @@ -640,6 +1053,7 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev) data = true; } v6 = false; + group.ip4 = iph->daddr; } else { dev->stats.tx_errors++; goto free; @@ -675,8 +1089,18 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev) if (!data) goto free; - list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) + list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) { + hash = amt_group_hash(tunnel, &group); + hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash], + node) { + if (!v6) + if (gnode->group_addr.ip4 == iph->daddr) + goto found; + } + continue; +found:; amt_send_multicast_data(amt, skb, tunnel, v6); + } } dev_kfree_skb(skb); @@ -706,6 +1130,22 @@ static int amt_parse_type(struct sk_buff *skb) return amth->type; } +static void amt_clear_groups(struct amt_tunnel_list *tunnel) +{ + struct amt_dev *amt = tunnel->amt; + struct amt_group_node *gnode; + struct hlist_node *t; + int i; + + spin_lock_bh(&tunnel->lock); + rcu_read_lock(); + for (i = 0; i < amt->hash_buckets; i++) + hlist_for_each_entry_safe(gnode, t, &tunnel->groups[i], node) + amt_del_group(amt, gnode); + rcu_read_unlock(); + spin_unlock_bh(&tunnel->lock); +} + static void amt_tunnel_expire(struct work_struct *work) { struct amt_tunnel_list *tunnel = container_of(to_delayed_work(work), @@ -717,11 +1157,687 @@ static void amt_tunnel_expire(struct work_struct *work) rcu_read_lock(); list_del_rcu(&tunnel->list); amt->nr_tunnels--; + amt_clear_groups(tunnel); rcu_read_unlock(); spin_unlock_bh(&amt->lock); kfree_rcu(tunnel, rcu); } +static void amt_cleanup_srcs(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode) +{ + struct amt_source_node *snode; + struct hlist_node *t; + int i; + + /* Delete old sources */ + for (i = 0; i < amt->hash_buckets; i++) { + hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) { + if (snode->flags == AMT_SOURCE_OLD) + amt_destroy_source(snode); + } + } + + /* switch from new to old */ + for (i = 0; i < amt->hash_buckets; i++) { + hlist_for_each_entry_rcu(snode, &gnode->sources[i], node) { + snode->flags = AMT_SOURCE_OLD; + if (!gnode->v6) + netdev_dbg(snode->gnode->amt->dev, + "Add source as OLD %pI4 from %pI4\n", + &snode->source_addr.ip4, + &gnode->group_addr.ip4); + } + } +} + +static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, void *grec, + bool v6) +{ + struct igmpv3_grec *igmp_grec; + struct amt_source_node *snode; + union amt_addr src = {0,}; + u16 nsrcs; + u32 hash; + int i; + + if (!v6) { + igmp_grec = (struct igmpv3_grec *)grec; + nsrcs = ntohs(igmp_grec->grec_nsrcs); + } else { + return; + } + for (i = 0; i < nsrcs; i++) { + if (tunnel->nr_sources >= amt->max_sources) + return; + if (!v6) + src.ip4 = igmp_grec->grec_src[i]; + if (amt_lookup_src(tunnel, gnode, AMT_FILTER_ALL, &src)) + continue; + + snode = amt_alloc_snode(gnode, &src); + if (snode) { + hash = amt_source_hash(tunnel, &snode->source_addr); + hlist_add_head_rcu(&snode->node, &gnode->sources[hash]); + tunnel->nr_sources++; + gnode->nr_sources++; + + if (!gnode->v6) + netdev_dbg(snode->gnode->amt->dev, + "Add source as NEW %pI4 from %pI4\n", + &snode->source_addr.ip4, + &gnode->group_addr.ip4); + } + } +} + +/* Router State Report Rec'd New Router State + * ------------ ------------ ---------------- + * EXCLUDE (X,Y) IS_IN (A) EXCLUDE (X+A,Y-A) + * + * -----------+-----------+-----------+ + * | OLD | NEW | + * -----------+-----------+-----------+ + * FWD | X | X+A | + * -----------+-----------+-----------+ + * D_FWD | Y | Y-A | + * -----------+-----------+-----------+ + * NONE | | A | + * -----------+-----------+-----------+ + * + * a) Received sources are NONE/NEW + * b) All NONE will be deleted by amt_cleanup_srcs(). + * c) All OLD will be deleted by amt_cleanup_srcs(). + * d) After delete, NEW source will be switched to OLD. + */ +static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, + enum amt_ops ops, + enum amt_filter filter, + enum amt_act act, + bool v6) +{ + struct amt_dev *amt = tunnel->amt; + struct amt_source_node *snode; + struct igmpv3_grec *igmp_grec; + union amt_addr src = {0,}; + struct hlist_node *t; + u16 nsrcs; + int i, j; + + if (!v6) { + igmp_grec = (struct igmpv3_grec *)grec; + nsrcs = ntohs(igmp_grec->grec_nsrcs); + } else { + return; + } + + memset(&src, 0, sizeof(union amt_addr)); + switch (ops) { + case AMT_OPS_INT: + /* A*B */ + for (i = 0; i < nsrcs; i++) { + if (!v6) + src.ip4 = igmp_grec->grec_src[i]; + snode = amt_lookup_src(tunnel, gnode, filter, &src); + if (!snode) + continue; + amt_act_src(tunnel, gnode, snode, act); + } + break; + case AMT_OPS_UNI: + /* A+B */ + for (i = 0; i < amt->hash_buckets; i++) { + hlist_for_each_entry_safe(snode, t, &gnode->sources[i], + node) { + if (amt_status_filter(snode, filter)) + amt_act_src(tunnel, gnode, snode, act); + } + } + for (i = 0; i < nsrcs; i++) { + if (!v6) + src.ip4 = igmp_grec->grec_src[i]; + snode = amt_lookup_src(tunnel, gnode, filter, &src); + if (!snode) + continue; + amt_act_src(tunnel, gnode, snode, act); + } + break; + case AMT_OPS_SUB: + /* A-B */ + for (i = 0; i < amt->hash_buckets; i++) { + hlist_for_each_entry_safe(snode, t, &gnode->sources[i], + node) { + if (!amt_status_filter(snode, filter)) + continue; + for (j = 0; j < nsrcs; j++) { + if (!v6) + src.ip4 = igmp_grec->grec_src[j]; + if (amt_addr_equal(&snode->source_addr, + &src)) + goto out_sub; + } + amt_act_src(tunnel, gnode, snode, act); + continue; +out_sub:; + } + } + break; + case AMT_OPS_SUB_REV: + /* B-A */ + for (i = 0; i < nsrcs; i++) { + if (!v6) + src.ip4 = igmp_grec->grec_src[i]; + snode = amt_lookup_src(tunnel, gnode, AMT_FILTER_ALL, + &src); + if (!snode) { + snode = amt_lookup_src(tunnel, gnode, + filter, &src); + if (snode) + amt_act_src(tunnel, gnode, snode, act); + } + } + break; + default: + netdev_dbg(amt->dev, "Invalid type\n"); + return; + } +} + +static void amt_mcast_is_in_handler(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, void *zero_grec, bool v6) +{ + if (gnode->filter_mode == MCAST_INCLUDE) { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI + */ + /* Update IS_IN (B) as FWD/NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_NONE_NEW, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* Update INCLUDE (A) as NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* (B)=GMI */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD_NEW, + AMT_ACT_GMI, + v6); + } else { +/* State Actions + * ------------ ------------ ---------------- ------- + * EXCLUDE (X,Y) IS_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI + */ + /* Update (A) in (X, Y) as NONE/NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_BOTH, + AMT_ACT_STATUS_NONE_NEW, + v6); + /* Update FWD/OLD as FWD/NEW */ + amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* Update IS_IN (A) as FWD/NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_NONE_NEW, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* Update EXCLUDE (, Y-A) as D_FWD_NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + } +} + +static void amt_mcast_is_ex_handler(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, void *zero_grec, bool v6) +{ + if (gnode->filter_mode == MCAST_INCLUDE) { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 + * Delete (A-B) + * Group Timer=GMI + */ + /* EXCLUDE(A*B, ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE(, B-A) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + /* (B-A)=0 */ + amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, + AMT_FILTER_D_FWD_NEW, + AMT_ACT_GMI_ZERO, + v6); + /* Group Timer=GMI */ + if (!mod_delayed_work(amt_wq, &gnode->group_timer, + msecs_to_jiffies(amt_gmi(amt)))) + dev_hold(amt->dev); + gnode->filter_mode = MCAST_EXCLUDE; + /* Delete (A-B) will be worked by amt_cleanup_srcs(). */ + } else { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI + * Delete (X-A) + * Delete (Y-A) + * Group Timer=GMI + */ + /* EXCLUDE (A-Y, ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (, Y*A ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + /* (A-X-Y)=GMI */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_BOTH_NEW, + AMT_ACT_GMI, + v6); + /* Group Timer=GMI */ + if (!mod_delayed_work(amt_wq, &gnode->group_timer, + msecs_to_jiffies(amt_gmi(amt)))) + dev_hold(amt->dev); + /* Delete (X-A), (Y-A) will be worked by amt_cleanup_srcs(). */ + } +} + +static void amt_mcast_to_in_handler(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, void *zero_grec, bool v6) +{ + if (gnode->filter_mode == MCAST_INCLUDE) { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI + * Send Q(G,A-B) + */ + /* Update TO_IN (B) sources as FWD/NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_NONE_NEW, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* Update INCLUDE (A) sources as NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* (B)=GMI */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD_NEW, + AMT_ACT_GMI, + v6); + } else { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI + * Send Q(G,X-A) + * Send Q(G) + */ + /* Update TO_IN (A) sources as FWD/NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_NONE_NEW, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* Update EXCLUDE(X,) sources as FWD/NEW */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (, Y-A) + * (A) are already switched to FWD_NEW. + * So, D_FWD/OLD -> D_FWD/NEW is okay. + */ + amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + /* (A)=GMI + * Only FWD_NEW will have (A) sources. + */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD_NEW, + AMT_ACT_GMI, + v6); + } +} + +static void amt_mcast_to_ex_handler(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, void *zero_grec, bool v6) +{ + if (gnode->filter_mode == MCAST_INCLUDE) { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0 + * Delete (A-B) + * Send Q(G,A*B) + * Group Timer=GMI + */ + /* EXCLUDE (A*B, ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (, B-A) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + /* (B-A)=0 */ + amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, + AMT_FILTER_D_FWD_NEW, + AMT_ACT_GMI_ZERO, + v6); + /* Group Timer=GMI */ + if (!mod_delayed_work(amt_wq, &gnode->group_timer, + msecs_to_jiffies(amt_gmi(amt)))) + dev_hold(amt->dev); + gnode->filter_mode = MCAST_EXCLUDE; + /* Delete (A-B) will be worked by amt_cleanup_srcs(). */ + } else { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer + * Delete (X-A) + * Delete (Y-A) + * Send Q(G,A-Y) + * Group Timer=GMI + */ + /* Update (A-X-Y) as NONE/OLD */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_BOTH, + AMT_ACT_GT, + v6); + /* EXCLUDE (A-Y, ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (, Y*A) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + /* Group Timer=GMI */ + if (!mod_delayed_work(amt_wq, &gnode->group_timer, + msecs_to_jiffies(amt_gmi(amt)))) + dev_hold(amt->dev); + /* Delete (X-A), (Y-A) will be worked by amt_cleanup_srcs(). */ + } +} + +static void amt_mcast_allow_handler(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, void *zero_grec, bool v6) +{ + if (gnode->filter_mode == MCAST_INCLUDE) { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI + */ + /* INCLUDE (A+B) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* (B)=GMI */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD_NEW, + AMT_ACT_GMI, + v6); + } else { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI + */ + /* EXCLUDE (X+A, ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (, Y-A) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + /* (A)=GMI + * All (A) source are now FWD/NEW status. + */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT, + AMT_FILTER_FWD_NEW, + AMT_ACT_GMI, + v6); + } +} + +static void amt_mcast_block_handler(struct amt_dev *amt, + struct amt_tunnel_list *tunnel, + struct amt_group_node *gnode, + void *grec, void *zero_grec, bool v6) +{ + if (gnode->filter_mode == MCAST_INCLUDE) { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B) + */ + /* INCLUDE (A) */ + amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + } else { +/* Router State Report Rec'd New Router State Actions + * ------------ ------------ ---------------- ------- + * EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer + * Send Q(G,A-Y) + */ + /* (A-X-Y)=Group Timer */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_BOTH, + AMT_ACT_GT, + v6); + /* EXCLUDE (X, ) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (X+(A-Y) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_FWD_NEW, + v6); + /* EXCLUDE (, Y) */ + amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI, + AMT_FILTER_D_FWD, + AMT_ACT_STATUS_D_FWD_NEW, + v6); + } +} + +/* RFC 3376 + * 7.3.2. In the Presence of Older Version Group Members + * + * When Group Compatibility Mode is IGMPv2, a router internally + * translates the following IGMPv2 messages for that group to their + * IGMPv3 equivalents: + * + * IGMPv2 Message IGMPv3 Equivalent + * -------------- ----------------- + * Report IS_EX( {} ) + * Leave TO_IN( {} ) + */ +static void amt_igmpv2_report_handler(struct amt_dev *amt, struct sk_buff *skb, + struct amt_tunnel_list *tunnel) +{ + struct igmphdr *ih = igmp_hdr(skb); + struct iphdr *iph = ip_hdr(skb); + struct amt_group_node *gnode; + union amt_addr group, host; + + memset(&group, 0, sizeof(union amt_addr)); + group.ip4 = ih->group; + memset(&host, 0, sizeof(union amt_addr)); + host.ip4 = iph->saddr; + + gnode = amt_lookup_group(tunnel, &group, &host, false); + if (!gnode) { + gnode = amt_add_group(amt, tunnel, &group, &host, false); + if (!IS_ERR(gnode)) { + gnode->filter_mode = MCAST_EXCLUDE; + if (!mod_delayed_work(amt_wq, &gnode->group_timer, + msecs_to_jiffies(amt_gmi(amt)))) + dev_hold(amt->dev); + } + } +} + +/* RFC 3376 + * 7.3.2. In the Presence of Older Version Group Members + * + * When Group Compatibility Mode is IGMPv2, a router internally + * translates the following IGMPv2 messages for that group to their + * IGMPv3 equivalents: + * + * IGMPv2 Message IGMPv3 Equivalent + * -------------- ----------------- + * Report IS_EX( {} ) + * Leave TO_IN( {} ) + */ +static void amt_igmpv2_leave_handler(struct amt_dev *amt, struct sk_buff *skb, + struct amt_tunnel_list *tunnel) +{ + struct igmphdr *ih = igmp_hdr(skb); + struct iphdr *iph = ip_hdr(skb); + struct amt_group_node *gnode; + union amt_addr group, host; + + memset(&group, 0, sizeof(union amt_addr)); + group.ip4 = ih->group; + memset(&host, 0, sizeof(union amt_addr)); + host.ip4 = iph->saddr; + + gnode = amt_lookup_group(tunnel, &group, &host, false); + if (gnode) + amt_del_group(amt, gnode); +} + +static void amt_igmpv3_report_handler(struct amt_dev *amt, struct sk_buff *skb, + struct amt_tunnel_list *tunnel) +{ + struct igmpv3_report *ihrv3 = igmpv3_report_hdr(skb); + int len = skb_transport_offset(skb) + sizeof(*ihrv3); + void *zero_grec = (void *)&igmpv3_zero_grec; + struct iphdr *iph = ip_hdr(skb); + struct amt_group_node *gnode; + union amt_addr group, host; + struct igmpv3_grec *grec; + u16 nsrcs; + int i; + + for (i = 0; i < ntohs(ihrv3->ngrec); i++) { + len += sizeof(*grec); + if (!ip_mc_may_pull(skb, len)) + break; + + grec = (void *)(skb->data + len - sizeof(*grec)); + nsrcs = ntohs(grec->grec_nsrcs); + + len += nsrcs * sizeof(__be32); + if (!ip_mc_may_pull(skb, len)) + break; + + memset(&group, 0, sizeof(union amt_addr)); + group.ip4 = grec->grec_mca; + memset(&host, 0, sizeof(union amt_addr)); + host.ip4 = iph->saddr; + gnode = amt_lookup_group(tunnel, &group, &host, false); + if (!gnode) { + gnode = amt_add_group(amt, tunnel, &group, &host, + false); + if (IS_ERR(gnode)) + continue; + } + + amt_add_srcs(amt, tunnel, gnode, grec, false); + switch (grec->grec_type) { + case IGMPV3_MODE_IS_INCLUDE: + amt_mcast_is_in_handler(amt, tunnel, gnode, grec, + zero_grec, false); + break; + case IGMPV3_MODE_IS_EXCLUDE: + amt_mcast_is_ex_handler(amt, tunnel, gnode, grec, + zero_grec, false); + break; + case IGMPV3_CHANGE_TO_INCLUDE: + amt_mcast_to_in_handler(amt, tunnel, gnode, grec, + zero_grec, false); + break; + case IGMPV3_CHANGE_TO_EXCLUDE: + amt_mcast_to_ex_handler(amt, tunnel, gnode, grec, + zero_grec, false); + break; + case IGMPV3_ALLOW_NEW_SOURCES: + amt_mcast_allow_handler(amt, tunnel, gnode, grec, + zero_grec, false); + break; + case IGMPV3_BLOCK_OLD_SOURCES: + amt_mcast_block_handler(amt, tunnel, gnode, grec, + zero_grec, false); + break; + default: + break; + } + amt_cleanup_srcs(amt, tunnel, gnode); + } +} + +/* caller held tunnel->lock */ +static void amt_igmp_report_handler(struct amt_dev *amt, struct sk_buff *skb, + struct amt_tunnel_list *tunnel) +{ + struct igmphdr *ih = igmp_hdr(skb); + + switch (ih->type) { + case IGMPV3_HOST_MEMBERSHIP_REPORT: + amt_igmpv3_report_handler(amt, skb, tunnel); + break; + case IGMPV2_HOST_MEMBERSHIP_REPORT: + amt_igmpv2_report_handler(amt, skb, tunnel); + break; + case IGMP_HOST_LEAVE_MESSAGE: + amt_igmpv2_leave_handler(amt, skb, tunnel); + break; + default: + break; + } +} + static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb) { struct amt_header_advertisement *amta; @@ -905,6 +2021,10 @@ report: return true; } + spin_lock_bh(&tunnel->lock); + amt_igmp_report_handler(amt, skb, tunnel); + spin_unlock_bh(&tunnel->lock); + skb_push(skb, sizeof(struct ethhdr)); skb_reset_mac_header(skb); eth = eth_hdr(skb); @@ -1338,6 +2458,7 @@ static int amt_dev_stop(struct net_device *dev) list_del_rcu(&tunnel->list); amt->nr_tunnels--; cancel_delayed_work_sync(&tunnel->gc_wq); + amt_clear_groups(tunnel); kfree_rcu(tunnel, rcu); } @@ -1708,6 +2829,13 @@ static int __init amt_init(void) if (!amt_wq) goto rtnl_unregister; + spin_lock_init(&source_gc_lock); + spin_lock_bh(&source_gc_lock); + INIT_DELAYED_WORK(&source_gc_wq, amt_source_gc_work); + mod_delayed_work(amt_wq, &source_gc_wq, + msecs_to_jiffies(AMT_GC_INTERVAL)); + spin_unlock_bh(&source_gc_lock); + return 0; rtnl_unregister: @@ -1724,6 +2852,8 @@ static void __exit amt_fini(void) { rtnl_link_unregister(&amt_link_ops); unregister_netdevice_notifier(&amt_notifier_block); + flush_delayed_work(&source_gc_wq); + __amt_source_gc_work(); destroy_workqueue(amt_wq); } module_exit(amt_fini); diff --git a/include/net/amt.h b/include/net/amt.h index 31b0cf17044b..95b142ec1183 100644 --- a/include/net/amt.h +++ b/include/net/amt.h @@ -21,6 +21,46 @@ enum amt_msg_type { #define AMT_MSG_MAX (__AMT_MSG_MAX - 1) +enum amt_ops { + /* A*B */ + AMT_OPS_INT, + /* A+B */ + AMT_OPS_UNI, + /* A-B */ + AMT_OPS_SUB, + /* B-A */ + AMT_OPS_SUB_REV, + __AMT_OPS_MAX, +}; + +#define AMT_OPS_MAX (__AMT_OPS_MAX - 1) + +enum amt_filter { + AMT_FILTER_FWD, + AMT_FILTER_D_FWD, + AMT_FILTER_FWD_NEW, + AMT_FILTER_D_FWD_NEW, + AMT_FILTER_ALL, + AMT_FILTER_NONE_NEW, + AMT_FILTER_BOTH, + AMT_FILTER_BOTH_NEW, + __AMT_FILTER_MAX, +}; + +#define AMT_FILTER_MAX (__AMT_FILTER_MAX - 1) + +enum amt_act { + AMT_ACT_GMI, + AMT_ACT_GMI_ZERO, + AMT_ACT_GT, + AMT_ACT_STATUS_FWD_NEW, + AMT_ACT_STATUS_D_FWD_NEW, + AMT_ACT_STATUS_NONE_NEW, + __AMT_ACT_MAX, +}; + +#define AMT_ACT_MAX (__AMT_ACT_MAX - 1) + enum amt_status { AMT_STATUS_INIT, AMT_STATUS_SENT_DISCOVERY, @@ -152,6 +192,17 @@ struct amt_header_mcast_data { #endif } __packed; +struct amt_headers { + union { + struct amt_header_discovery discovery; + struct amt_header_advertisement advertisement; + struct amt_header_request request; + struct amt_header_membership_query query; + struct amt_header_membership_update update; + struct amt_header_mcast_data data; + }; +} __packed; + struct amt_gw_headers { union { struct amt_header_discovery discovery; @@ -191,6 +242,56 @@ struct amt_tunnel_list { struct hlist_head groups[]; }; +union amt_addr { + __be32 ip4; +#if IS_ENABLED(CONFIG_IPV6) + struct in6_addr ip6; +#endif +}; + +/* RFC 3810 + * + * When the router is in EXCLUDE mode, the router state is represented + * by the notation EXCLUDE (X,Y), where X is called the "Requested List" + * and Y is called the "Exclude List". All sources, except those from + * the Exclude List, will be forwarded by the router + */ +enum amt_source_status { + AMT_SOURCE_STATUS_NONE, + /* Node of Requested List */ + AMT_SOURCE_STATUS_FWD, + /* Node of Exclude List */ + AMT_SOURCE_STATUS_D_FWD, +}; + +/* protected by gnode->lock */ +struct amt_source_node { + struct hlist_node node; + struct amt_group_node *gnode; + struct delayed_work source_timer; + union amt_addr source_addr; + enum amt_source_status status; +#define AMT_SOURCE_OLD 0 +#define AMT_SOURCE_NEW 1 + u8 flags; + struct rcu_head rcu; +}; + +/* Protected by amt_tunnel_list->lock */ +struct amt_group_node { + struct amt_dev *amt; + union amt_addr group_addr; + union amt_addr host_addr; + bool v6; + u8 filter_mode; + u32 nr_sources; + struct amt_tunnel_list *tunnel_list; + struct hlist_node node; + struct delayed_work group_timer; + struct rcu_head rcu; + struct hlist_head sources[]; +}; + struct amt_dev { struct net_device *dev; struct net_device *stream_dev; @@ -246,8 +347,9 @@ struct amt_dev { reserved:16; }; -#define AMT_TOS 0xc0 +#define AMT_TOS 0xc0 #define AMT_IPHDR_OPTS 4 +#define AMT_GC_INTERVAL (30 * 1000) #define AMT_MAX_GROUP 32 #define AMT_MAX_SOURCE 128 #define AMT_HSIZE_SHIFT 8 |