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3298 lines
86 KiB
3298 lines
86 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* Copyright (c) 2021 Taehee Yoo <[email protected]> */ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <linux/module.h> |
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#include <linux/skbuff.h> |
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#include <linux/udp.h> |
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#include <linux/jhash.h> |
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#include <linux/if_tunnel.h> |
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#include <linux/net.h> |
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#include <linux/igmp.h> |
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#include <linux/workqueue.h> |
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#include <net/sch_generic.h> |
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#include <net/net_namespace.h> |
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#include <net/ip.h> |
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#include <net/udp.h> |
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#include <net/udp_tunnel.h> |
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#include <net/icmp.h> |
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#include <net/mld.h> |
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#include <net/amt.h> |
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#include <uapi/linux/amt.h> |
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#include <linux/security.h> |
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#include <net/gro_cells.h> |
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#include <net/ipv6.h> |
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#include <net/if_inet6.h> |
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#include <net/ndisc.h> |
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#include <net/addrconf.h> |
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#include <net/ip6_route.h> |
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#include <net/inet_common.h> |
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#include <net/ip6_checksum.h> |
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static struct workqueue_struct *amt_wq; |
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static HLIST_HEAD(source_gc_list); |
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/* Lock for source_gc_list */ |
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static spinlock_t source_gc_lock; |
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static struct delayed_work source_gc_wq; |
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static char *status_str[] = { |
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"AMT_STATUS_INIT", |
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"AMT_STATUS_SENT_DISCOVERY", |
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"AMT_STATUS_RECEIVED_DISCOVERY", |
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"AMT_STATUS_SENT_ADVERTISEMENT", |
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"AMT_STATUS_RECEIVED_ADVERTISEMENT", |
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"AMT_STATUS_SENT_REQUEST", |
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"AMT_STATUS_RECEIVED_REQUEST", |
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"AMT_STATUS_SENT_QUERY", |
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"AMT_STATUS_RECEIVED_QUERY", |
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"AMT_STATUS_SENT_UPDATE", |
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"AMT_STATUS_RECEIVED_UPDATE", |
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}; |
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static char *type_str[] = { |
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"AMT_MSG_DISCOVERY", |
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"AMT_MSG_ADVERTISEMENT", |
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"AMT_MSG_REQUEST", |
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"AMT_MSG_MEMBERSHIP_QUERY", |
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"AMT_MSG_MEMBERSHIP_UPDATE", |
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"AMT_MSG_MULTICAST_DATA", |
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"AMT_MSG_TEARDOWM", |
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}; |
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static char *action_str[] = { |
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"AMT_ACT_GMI", |
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"AMT_ACT_GMI_ZERO", |
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"AMT_ACT_GT", |
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"AMT_ACT_STATUS_FWD_NEW", |
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"AMT_ACT_STATUS_D_FWD_NEW", |
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"AMT_ACT_STATUS_NONE_NEW", |
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}; |
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static struct igmpv3_grec igmpv3_zero_grec; |
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#if IS_ENABLED(CONFIG_IPV6) |
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#define MLD2_ALL_NODE_INIT { { { 0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01 } } } |
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static struct in6_addr mld2_all_node = MLD2_ALL_NODE_INIT; |
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static struct mld2_grec mldv2_zero_grec; |
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#endif |
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static struct amt_skb_cb *amt_skb_cb(struct sk_buff *skb) |
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{ |
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BUILD_BUG_ON(sizeof(struct amt_skb_cb) + sizeof(struct qdisc_skb_cb) > |
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sizeof_field(struct sk_buff, cb)); |
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return (struct amt_skb_cb *)((void *)skb->cb + |
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sizeof(struct qdisc_skb_cb)); |
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} |
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static void __amt_source_gc_work(void) |
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{ |
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struct amt_source_node *snode; |
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struct hlist_head gc_list; |
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struct hlist_node *t; |
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spin_lock_bh(&source_gc_lock); |
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hlist_move_list(&source_gc_list, &gc_list); |
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spin_unlock_bh(&source_gc_lock); |
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hlist_for_each_entry_safe(snode, t, &gc_list, node) { |
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hlist_del_rcu(&snode->node); |
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kfree_rcu(snode, rcu); |
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} |
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} |
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static void amt_source_gc_work(struct work_struct *work) |
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{ |
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__amt_source_gc_work(); |
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spin_lock_bh(&source_gc_lock); |
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mod_delayed_work(amt_wq, &source_gc_wq, |
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msecs_to_jiffies(AMT_GC_INTERVAL)); |
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spin_unlock_bh(&source_gc_lock); |
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} |
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static bool amt_addr_equal(union amt_addr *a, union amt_addr *b) |
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{ |
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return !memcmp(a, b, sizeof(union amt_addr)); |
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} |
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static u32 amt_source_hash(struct amt_tunnel_list *tunnel, union amt_addr *src) |
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{ |
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u32 hash = jhash(src, sizeof(*src), tunnel->amt->hash_seed); |
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return reciprocal_scale(hash, tunnel->amt->hash_buckets); |
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} |
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static bool amt_status_filter(struct amt_source_node *snode, |
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enum amt_filter filter) |
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{ |
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bool rc = false; |
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switch (filter) { |
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case AMT_FILTER_FWD: |
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if (snode->status == AMT_SOURCE_STATUS_FWD && |
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snode->flags == AMT_SOURCE_OLD) |
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rc = true; |
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break; |
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case AMT_FILTER_D_FWD: |
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if (snode->status == AMT_SOURCE_STATUS_D_FWD && |
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snode->flags == AMT_SOURCE_OLD) |
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rc = true; |
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break; |
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case AMT_FILTER_FWD_NEW: |
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if (snode->status == AMT_SOURCE_STATUS_FWD && |
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snode->flags == AMT_SOURCE_NEW) |
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rc = true; |
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break; |
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case AMT_FILTER_D_FWD_NEW: |
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if (snode->status == AMT_SOURCE_STATUS_D_FWD && |
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snode->flags == AMT_SOURCE_NEW) |
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rc = true; |
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break; |
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case AMT_FILTER_ALL: |
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rc = true; |
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break; |
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case AMT_FILTER_NONE_NEW: |
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if (snode->status == AMT_SOURCE_STATUS_NONE && |
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snode->flags == AMT_SOURCE_NEW) |
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rc = true; |
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break; |
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case AMT_FILTER_BOTH: |
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if ((snode->status == AMT_SOURCE_STATUS_D_FWD || |
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snode->status == AMT_SOURCE_STATUS_FWD) && |
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snode->flags == AMT_SOURCE_OLD) |
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rc = true; |
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break; |
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case AMT_FILTER_BOTH_NEW: |
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if ((snode->status == AMT_SOURCE_STATUS_D_FWD || |
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snode->status == AMT_SOURCE_STATUS_FWD) && |
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snode->flags == AMT_SOURCE_NEW) |
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rc = true; |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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break; |
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} |
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return rc; |
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} |
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static struct amt_source_node *amt_lookup_src(struct amt_tunnel_list *tunnel, |
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struct amt_group_node *gnode, |
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enum amt_filter filter, |
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union amt_addr *src) |
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{ |
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u32 hash = amt_source_hash(tunnel, src); |
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struct amt_source_node *snode; |
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hlist_for_each_entry_rcu(snode, &gnode->sources[hash], node) |
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if (amt_status_filter(snode, filter) && |
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amt_addr_equal(&snode->source_addr, src)) |
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return snode; |
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return NULL; |
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} |
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static u32 amt_group_hash(struct amt_tunnel_list *tunnel, union amt_addr *group) |
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{ |
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u32 hash = jhash(group, sizeof(*group), tunnel->amt->hash_seed); |
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return reciprocal_scale(hash, tunnel->amt->hash_buckets); |
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} |
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static struct amt_group_node *amt_lookup_group(struct amt_tunnel_list *tunnel, |
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union amt_addr *group, |
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union amt_addr *host, |
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bool v6) |
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{ |
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u32 hash = amt_group_hash(tunnel, group); |
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struct amt_group_node *gnode; |
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hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash], node) { |
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if (amt_addr_equal(&gnode->group_addr, group) && |
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amt_addr_equal(&gnode->host_addr, host) && |
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gnode->v6 == v6) |
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return gnode; |
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} |
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return NULL; |
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} |
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static void amt_destroy_source(struct amt_source_node *snode) |
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{ |
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struct amt_group_node *gnode = snode->gnode; |
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struct amt_tunnel_list *tunnel; |
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tunnel = gnode->tunnel_list; |
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if (!gnode->v6) { |
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netdev_dbg(snode->gnode->amt->dev, |
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"Delete source %pI4 from %pI4\n", |
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&snode->source_addr.ip4, |
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&gnode->group_addr.ip4); |
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#if IS_ENABLED(CONFIG_IPV6) |
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} else { |
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netdev_dbg(snode->gnode->amt->dev, |
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"Delete source %pI6 from %pI6\n", |
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&snode->source_addr.ip6, |
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&gnode->group_addr.ip6); |
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#endif |
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} |
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cancel_delayed_work(&snode->source_timer); |
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hlist_del_init_rcu(&snode->node); |
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tunnel->nr_sources--; |
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gnode->nr_sources--; |
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spin_lock_bh(&source_gc_lock); |
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hlist_add_head_rcu(&snode->node, &source_gc_list); |
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spin_unlock_bh(&source_gc_lock); |
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} |
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static void amt_del_group(struct amt_dev *amt, struct amt_group_node *gnode) |
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{ |
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struct amt_source_node *snode; |
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struct hlist_node *t; |
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int i; |
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if (cancel_delayed_work(&gnode->group_timer)) |
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dev_put(amt->dev); |
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hlist_del_rcu(&gnode->node); |
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gnode->tunnel_list->nr_groups--; |
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if (!gnode->v6) |
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netdev_dbg(amt->dev, "Leave group %pI4\n", |
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&gnode->group_addr.ip4); |
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#if IS_ENABLED(CONFIG_IPV6) |
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else |
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netdev_dbg(amt->dev, "Leave group %pI6\n", |
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&gnode->group_addr.ip6); |
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#endif |
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for (i = 0; i < amt->hash_buckets; i++) |
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hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) |
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amt_destroy_source(snode); |
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/* tunnel->lock was acquired outside of amt_del_group() |
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* But rcu_read_lock() was acquired too so It's safe. |
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*/ |
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kfree_rcu(gnode, rcu); |
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} |
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/* If a source timer expires with a router filter-mode for the group of |
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* INCLUDE, the router concludes that traffic from this particular |
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* source is no longer desired on the attached network, and deletes the |
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* associated source record. |
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*/ |
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static void amt_source_work(struct work_struct *work) |
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{ |
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struct amt_source_node *snode = container_of(to_delayed_work(work), |
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struct amt_source_node, |
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source_timer); |
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struct amt_group_node *gnode = snode->gnode; |
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struct amt_dev *amt = gnode->amt; |
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struct amt_tunnel_list *tunnel; |
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tunnel = gnode->tunnel_list; |
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spin_lock_bh(&tunnel->lock); |
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rcu_read_lock(); |
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if (gnode->filter_mode == MCAST_INCLUDE) { |
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amt_destroy_source(snode); |
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if (!gnode->nr_sources) |
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amt_del_group(amt, gnode); |
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} else { |
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/* When a router filter-mode for a group is EXCLUDE, |
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* source records are only deleted when the group timer expires |
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*/ |
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snode->status = AMT_SOURCE_STATUS_D_FWD; |
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} |
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rcu_read_unlock(); |
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spin_unlock_bh(&tunnel->lock); |
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} |
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static void amt_act_src(struct amt_tunnel_list *tunnel, |
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struct amt_group_node *gnode, |
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struct amt_source_node *snode, |
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enum amt_act act) |
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{ |
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struct amt_dev *amt = tunnel->amt; |
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switch (act) { |
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case AMT_ACT_GMI: |
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mod_delayed_work(amt_wq, &snode->source_timer, |
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msecs_to_jiffies(amt_gmi(amt))); |
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break; |
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case AMT_ACT_GMI_ZERO: |
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cancel_delayed_work(&snode->source_timer); |
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break; |
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case AMT_ACT_GT: |
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mod_delayed_work(amt_wq, &snode->source_timer, |
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gnode->group_timer.timer.expires); |
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break; |
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case AMT_ACT_STATUS_FWD_NEW: |
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snode->status = AMT_SOURCE_STATUS_FWD; |
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snode->flags = AMT_SOURCE_NEW; |
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break; |
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case AMT_ACT_STATUS_D_FWD_NEW: |
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snode->status = AMT_SOURCE_STATUS_D_FWD; |
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snode->flags = AMT_SOURCE_NEW; |
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break; |
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case AMT_ACT_STATUS_NONE_NEW: |
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cancel_delayed_work(&snode->source_timer); |
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snode->status = AMT_SOURCE_STATUS_NONE; |
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snode->flags = AMT_SOURCE_NEW; |
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break; |
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default: |
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WARN_ON_ONCE(1); |
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return; |
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} |
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if (!gnode->v6) |
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netdev_dbg(amt->dev, "Source %pI4 from %pI4 Acted %s\n", |
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&snode->source_addr.ip4, |
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&gnode->group_addr.ip4, |
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action_str[act]); |
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#if IS_ENABLED(CONFIG_IPV6) |
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else |
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netdev_dbg(amt->dev, "Source %pI6 from %pI6 Acted %s\n", |
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&snode->source_addr.ip6, |
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&gnode->group_addr.ip6, |
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action_str[act]); |
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#endif |
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} |
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static struct amt_source_node *amt_alloc_snode(struct amt_group_node *gnode, |
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union amt_addr *src) |
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{ |
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struct amt_source_node *snode; |
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snode = kzalloc(sizeof(*snode), GFP_ATOMIC); |
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if (!snode) |
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return NULL; |
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memcpy(&snode->source_addr, src, sizeof(union amt_addr)); |
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snode->gnode = gnode; |
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snode->status = AMT_SOURCE_STATUS_NONE; |
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snode->flags = AMT_SOURCE_NEW; |
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INIT_HLIST_NODE(&snode->node); |
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INIT_DELAYED_WORK(&snode->source_timer, amt_source_work); |
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return snode; |
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} |
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|
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/* RFC 3810 - 7.2.2. Definition of Filter Timers |
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* |
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* Router Mode Filter Timer Actions/Comments |
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* ----------- ----------------- ---------------- |
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* |
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* INCLUDE Not Used All listeners in |
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* INCLUDE mode. |
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* |
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* EXCLUDE Timer > 0 At least one listener |
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* in EXCLUDE mode. |
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* |
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* EXCLUDE Timer == 0 No more listeners in |
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* EXCLUDE mode for the |
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* multicast address. |
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* If the Requested List |
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* is empty, delete |
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* Multicast Address |
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* Record. If not, switch |
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* to INCLUDE filter mode; |
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* the sources in the |
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* Requested List are |
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* moved to the Include |
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* List, and the Exclude |
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* List is deleted. |
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*/ |
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static void amt_group_work(struct work_struct *work) |
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{ |
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struct amt_group_node *gnode = container_of(to_delayed_work(work), |
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struct amt_group_node, |
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group_timer); |
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struct amt_tunnel_list *tunnel = gnode->tunnel_list; |
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struct amt_dev *amt = gnode->amt; |
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struct amt_source_node *snode; |
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bool delete_group = true; |
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struct hlist_node *t; |
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int i, buckets; |
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buckets = amt->hash_buckets; |
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|
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spin_lock_bh(&tunnel->lock); |
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if (gnode->filter_mode == MCAST_INCLUDE) { |
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/* Not Used */ |
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spin_unlock_bh(&tunnel->lock); |
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goto out; |
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} |
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rcu_read_lock(); |
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for (i = 0; i < buckets; i++) { |
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hlist_for_each_entry_safe(snode, t, |
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&gnode->sources[i], node) { |
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if (!delayed_work_pending(&snode->source_timer) || |
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snode->status == AMT_SOURCE_STATUS_D_FWD) { |
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amt_destroy_source(snode); |
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} else { |
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delete_group = false; |
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snode->status = AMT_SOURCE_STATUS_FWD; |
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} |
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} |
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} |
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if (delete_group) |
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amt_del_group(amt, gnode); |
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else |
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gnode->filter_mode = MCAST_INCLUDE; |
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rcu_read_unlock(); |
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spin_unlock_bh(&tunnel->lock); |
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out: |
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dev_put(amt->dev); |
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} |
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|
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/* Non-existant group is created as INCLUDE {empty}: |
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* |
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* RFC 3376 - 5.1. Action on Change of Interface State |
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* |
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* If no interface state existed for that multicast address before |
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* the change (i.e., the change consisted of creating a new |
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* per-interface record), or if no state exists after the change |
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* (i.e., the change consisted of deleting a per-interface record), |
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* then the "non-existent" state is considered to have a filter mode |
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* of INCLUDE and an empty source list. |
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*/ |
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static struct amt_group_node *amt_add_group(struct amt_dev *amt, |
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struct amt_tunnel_list *tunnel, |
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union amt_addr *group, |
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union amt_addr *host, |
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bool v6) |
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{ |
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struct amt_group_node *gnode; |
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u32 hash; |
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int i; |
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|
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if (tunnel->nr_groups >= amt->max_groups) |
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return ERR_PTR(-ENOSPC); |
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|
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gnode = kzalloc(sizeof(*gnode) + |
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(sizeof(struct hlist_head) * amt->hash_buckets), |
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GFP_ATOMIC); |
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if (unlikely(!gnode)) |
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return ERR_PTR(-ENOMEM); |
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|
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gnode->amt = amt; |
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gnode->group_addr = *group; |
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gnode->host_addr = *host; |
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gnode->v6 = v6; |
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gnode->tunnel_list = tunnel; |
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gnode->filter_mode = MCAST_INCLUDE; |
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INIT_HLIST_NODE(&gnode->node); |
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INIT_DELAYED_WORK(&gnode->group_timer, amt_group_work); |
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for (i = 0; i < amt->hash_buckets; i++) |
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INIT_HLIST_HEAD(&gnode->sources[i]); |
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|
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hash = amt_group_hash(tunnel, group); |
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hlist_add_head_rcu(&gnode->node, &tunnel->groups[hash]); |
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tunnel->nr_groups++; |
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|
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if (!gnode->v6) |
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netdev_dbg(amt->dev, "Join group %pI4\n", |
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&gnode->group_addr.ip4); |
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#if IS_ENABLED(CONFIG_IPV6) |
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else |
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netdev_dbg(amt->dev, "Join group %pI6\n", |
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&gnode->group_addr.ip6); |
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#endif |
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|
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return gnode; |
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} |
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|
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static struct sk_buff *amt_build_igmp_gq(struct amt_dev *amt) |
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{ |
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u8 ra[AMT_IPHDR_OPTS] = { IPOPT_RA, 4, 0, 0 }; |
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int hlen = LL_RESERVED_SPACE(amt->dev); |
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int tlen = amt->dev->needed_tailroom; |
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struct igmpv3_query *ihv3; |
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void *csum_start = NULL; |
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__sum16 *csum = NULL; |
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struct sk_buff *skb; |
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struct ethhdr *eth; |
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struct iphdr *iph; |
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unsigned int len; |
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int offset; |
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|
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len = hlen + tlen + sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3); |
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skb = netdev_alloc_skb_ip_align(amt->dev, len); |
|
if (!skb) |
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return NULL; |
|
|
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skb_reserve(skb, hlen); |
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skb_push(skb, sizeof(*eth)); |
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skb->protocol = htons(ETH_P_IP); |
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skb_reset_mac_header(skb); |
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skb->priority = TC_PRIO_CONTROL; |
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skb_put(skb, sizeof(*iph)); |
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skb_put_data(skb, ra, sizeof(ra)); |
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skb_put(skb, sizeof(*ihv3)); |
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skb_pull(skb, sizeof(*eth)); |
|
skb_reset_network_header(skb); |
|
|
|
iph = ip_hdr(skb); |
|
iph->version = 4; |
|
iph->ihl = (sizeof(struct iphdr) + AMT_IPHDR_OPTS) >> 2; |
|
iph->tos = AMT_TOS; |
|
iph->tot_len = htons(sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3)); |
|
iph->frag_off = htons(IP_DF); |
|
iph->ttl = 1; |
|
iph->id = 0; |
|
iph->protocol = IPPROTO_IGMP; |
|
iph->daddr = htonl(INADDR_ALLHOSTS_GROUP); |
|
iph->saddr = htonl(INADDR_ANY); |
|
ip_send_check(iph); |
|
|
|
eth = eth_hdr(skb); |
|
ether_addr_copy(eth->h_source, amt->dev->dev_addr); |
|
ip_eth_mc_map(htonl(INADDR_ALLHOSTS_GROUP), eth->h_dest); |
|
eth->h_proto = htons(ETH_P_IP); |
|
|
|
ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS); |
|
skb_reset_transport_header(skb); |
|
ihv3->type = IGMP_HOST_MEMBERSHIP_QUERY; |
|
ihv3->code = 1; |
|
ihv3->group = 0; |
|
ihv3->qqic = amt->qi; |
|
ihv3->nsrcs = 0; |
|
ihv3->resv = 0; |
|
ihv3->suppress = false; |
|
ihv3->qrv = amt->net->ipv4.sysctl_igmp_qrv; |
|
ihv3->csum = 0; |
|
csum = &ihv3->csum; |
|
csum_start = (void *)ihv3; |
|
*csum = ip_compute_csum(csum_start, sizeof(*ihv3)); |
|
offset = skb_transport_offset(skb); |
|
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
|
skb->ip_summed = CHECKSUM_NONE; |
|
|
|
skb_push(skb, sizeof(*eth) + sizeof(*iph) + AMT_IPHDR_OPTS); |
|
|
|
return skb; |
|
} |
|
|
|
static void __amt_update_gw_status(struct amt_dev *amt, enum amt_status status, |
|
bool validate) |
|
{ |
|
if (validate && amt->status >= status) |
|
return; |
|
netdev_dbg(amt->dev, "Update GW status %s -> %s", |
|
status_str[amt->status], status_str[status]); |
|
amt->status = status; |
|
} |
|
|
|
static void __amt_update_relay_status(struct amt_tunnel_list *tunnel, |
|
enum amt_status status, |
|
bool validate) |
|
{ |
|
if (validate && tunnel->status >= status) |
|
return; |
|
netdev_dbg(tunnel->amt->dev, |
|
"Update Tunnel(IP = %pI4, PORT = %u) status %s -> %s", |
|
&tunnel->ip4, ntohs(tunnel->source_port), |
|
status_str[tunnel->status], status_str[status]); |
|
tunnel->status = status; |
|
} |
|
|
|
static void amt_update_gw_status(struct amt_dev *amt, enum amt_status status, |
|
bool validate) |
|
{ |
|
spin_lock_bh(&amt->lock); |
|
__amt_update_gw_status(amt, status, validate); |
|
spin_unlock_bh(&amt->lock); |
|
} |
|
|
|
static void amt_update_relay_status(struct amt_tunnel_list *tunnel, |
|
enum amt_status status, bool validate) |
|
{ |
|
spin_lock_bh(&tunnel->lock); |
|
__amt_update_relay_status(tunnel, status, validate); |
|
spin_unlock_bh(&tunnel->lock); |
|
} |
|
|
|
static void amt_send_discovery(struct amt_dev *amt) |
|
{ |
|
struct amt_header_discovery *amtd; |
|
int hlen, tlen, offset; |
|
struct socket *sock; |
|
struct udphdr *udph; |
|
struct sk_buff *skb; |
|
struct iphdr *iph; |
|
struct rtable *rt; |
|
struct flowi4 fl4; |
|
u32 len; |
|
int err; |
|
|
|
rcu_read_lock(); |
|
sock = rcu_dereference(amt->sock); |
|
if (!sock) |
|
goto out; |
|
|
|
if (!netif_running(amt->stream_dev) || !netif_running(amt->dev)) |
|
goto out; |
|
|
|
rt = ip_route_output_ports(amt->net, &fl4, sock->sk, |
|
amt->discovery_ip, amt->local_ip, |
|
amt->gw_port, amt->relay_port, |
|
IPPROTO_UDP, 0, |
|
amt->stream_dev->ifindex); |
|
if (IS_ERR(rt)) { |
|
amt->dev->stats.tx_errors++; |
|
goto out; |
|
} |
|
|
|
hlen = LL_RESERVED_SPACE(amt->dev); |
|
tlen = amt->dev->needed_tailroom; |
|
len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amtd); |
|
skb = netdev_alloc_skb_ip_align(amt->dev, len); |
|
if (!skb) { |
|
ip_rt_put(rt); |
|
amt->dev->stats.tx_errors++; |
|
goto out; |
|
} |
|
|
|
skb->priority = TC_PRIO_CONTROL; |
|
skb_dst_set(skb, &rt->dst); |
|
|
|
len = sizeof(*iph) + sizeof(*udph) + sizeof(*amtd); |
|
skb_reset_network_header(skb); |
|
skb_put(skb, len); |
|
amtd = skb_pull(skb, sizeof(*iph) + sizeof(*udph)); |
|
amtd->version = 0; |
|
amtd->type = AMT_MSG_DISCOVERY; |
|
amtd->reserved = 0; |
|
amtd->nonce = amt->nonce; |
|
skb_push(skb, sizeof(*udph)); |
|
skb_reset_transport_header(skb); |
|
udph = udp_hdr(skb); |
|
udph->source = amt->gw_port; |
|
udph->dest = amt->relay_port; |
|
udph->len = htons(sizeof(*udph) + sizeof(*amtd)); |
|
udph->check = 0; |
|
offset = skb_transport_offset(skb); |
|
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
|
udph->check = csum_tcpudp_magic(amt->local_ip, amt->discovery_ip, |
|
sizeof(*udph) + sizeof(*amtd), |
|
IPPROTO_UDP, skb->csum); |
|
|
|
skb_push(skb, sizeof(*iph)); |
|
iph = ip_hdr(skb); |
|
iph->version = 4; |
|
iph->ihl = (sizeof(struct iphdr)) >> 2; |
|
iph->tos = AMT_TOS; |
|
iph->frag_off = 0; |
|
iph->ttl = ip4_dst_hoplimit(&rt->dst); |
|
iph->daddr = amt->discovery_ip; |
|
iph->saddr = amt->local_ip; |
|
iph->protocol = IPPROTO_UDP; |
|
iph->tot_len = htons(len); |
|
|
|
skb->ip_summed = CHECKSUM_NONE; |
|
ip_select_ident(amt->net, skb, NULL); |
|
ip_send_check(iph); |
|
err = ip_local_out(amt->net, sock->sk, skb); |
|
if (unlikely(net_xmit_eval(err))) |
|
amt->dev->stats.tx_errors++; |
|
|
|
spin_lock_bh(&amt->lock); |
|
__amt_update_gw_status(amt, AMT_STATUS_SENT_DISCOVERY, true); |
|
spin_unlock_bh(&amt->lock); |
|
out: |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void amt_send_request(struct amt_dev *amt, bool v6) |
|
{ |
|
struct amt_header_request *amtrh; |
|
int hlen, tlen, offset; |
|
struct socket *sock; |
|
struct udphdr *udph; |
|
struct sk_buff *skb; |
|
struct iphdr *iph; |
|
struct rtable *rt; |
|
struct flowi4 fl4; |
|
u32 len; |
|
int err; |
|
|
|
rcu_read_lock(); |
|
sock = rcu_dereference(amt->sock); |
|
if (!sock) |
|
goto out; |
|
|
|
if (!netif_running(amt->stream_dev) || !netif_running(amt->dev)) |
|
goto out; |
|
|
|
rt = ip_route_output_ports(amt->net, &fl4, sock->sk, |
|
amt->remote_ip, amt->local_ip, |
|
amt->gw_port, amt->relay_port, |
|
IPPROTO_UDP, 0, |
|
amt->stream_dev->ifindex); |
|
if (IS_ERR(rt)) { |
|
amt->dev->stats.tx_errors++; |
|
goto out; |
|
} |
|
|
|
hlen = LL_RESERVED_SPACE(amt->dev); |
|
tlen = amt->dev->needed_tailroom; |
|
len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amtrh); |
|
skb = netdev_alloc_skb_ip_align(amt->dev, len); |
|
if (!skb) { |
|
ip_rt_put(rt); |
|
amt->dev->stats.tx_errors++; |
|
goto out; |
|
} |
|
|
|
skb->priority = TC_PRIO_CONTROL; |
|
skb_dst_set(skb, &rt->dst); |
|
|
|
len = sizeof(*iph) + sizeof(*udph) + sizeof(*amtrh); |
|
skb_reset_network_header(skb); |
|
skb_put(skb, len); |
|
amtrh = skb_pull(skb, sizeof(*iph) + sizeof(*udph)); |
|
amtrh->version = 0; |
|
amtrh->type = AMT_MSG_REQUEST; |
|
amtrh->reserved1 = 0; |
|
amtrh->p = v6; |
|
amtrh->reserved2 = 0; |
|
amtrh->nonce = amt->nonce; |
|
skb_push(skb, sizeof(*udph)); |
|
skb_reset_transport_header(skb); |
|
udph = udp_hdr(skb); |
|
udph->source = amt->gw_port; |
|
udph->dest = amt->relay_port; |
|
udph->len = htons(sizeof(*amtrh) + sizeof(*udph)); |
|
udph->check = 0; |
|
offset = skb_transport_offset(skb); |
|
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
|
udph->check = csum_tcpudp_magic(amt->local_ip, amt->remote_ip, |
|
sizeof(*udph) + sizeof(*amtrh), |
|
IPPROTO_UDP, skb->csum); |
|
|
|
skb_push(skb, sizeof(*iph)); |
|
iph = ip_hdr(skb); |
|
iph->version = 4; |
|
iph->ihl = (sizeof(struct iphdr)) >> 2; |
|
iph->tos = AMT_TOS; |
|
iph->frag_off = 0; |
|
iph->ttl = ip4_dst_hoplimit(&rt->dst); |
|
iph->daddr = amt->remote_ip; |
|
iph->saddr = amt->local_ip; |
|
iph->protocol = IPPROTO_UDP; |
|
iph->tot_len = htons(len); |
|
|
|
skb->ip_summed = CHECKSUM_NONE; |
|
ip_select_ident(amt->net, skb, NULL); |
|
ip_send_check(iph); |
|
err = ip_local_out(amt->net, sock->sk, skb); |
|
if (unlikely(net_xmit_eval(err))) |
|
amt->dev->stats.tx_errors++; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
} |
|
|
|
static void amt_send_igmp_gq(struct amt_dev *amt, |
|
struct amt_tunnel_list *tunnel) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
skb = amt_build_igmp_gq(amt); |
|
if (!skb) |
|
return; |
|
|
|
amt_skb_cb(skb)->tunnel = tunnel; |
|
dev_queue_xmit(skb); |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
static struct sk_buff *amt_build_mld_gq(struct amt_dev *amt) |
|
{ |
|
u8 ra[AMT_IP6HDR_OPTS] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT, |
|
2, 0, 0, IPV6_TLV_PAD1, IPV6_TLV_PAD1 }; |
|
int hlen = LL_RESERVED_SPACE(amt->dev); |
|
int tlen = amt->dev->needed_tailroom; |
|
struct mld2_query *mld2q; |
|
void *csum_start = NULL; |
|
struct ipv6hdr *ip6h; |
|
struct sk_buff *skb; |
|
struct ethhdr *eth; |
|
u32 len; |
|
|
|
len = hlen + tlen + sizeof(*ip6h) + sizeof(ra) + sizeof(*mld2q); |
|
skb = netdev_alloc_skb_ip_align(amt->dev, len); |
|
if (!skb) |
|
return NULL; |
|
|
|
skb_reserve(skb, hlen); |
|
skb_push(skb, sizeof(*eth)); |
|
skb_reset_mac_header(skb); |
|
eth = eth_hdr(skb); |
|
skb->priority = TC_PRIO_CONTROL; |
|
skb->protocol = htons(ETH_P_IPV6); |
|
skb_put_zero(skb, sizeof(*ip6h)); |
|
skb_put_data(skb, ra, sizeof(ra)); |
|
skb_put_zero(skb, sizeof(*mld2q)); |
|
skb_pull(skb, sizeof(*eth)); |
|
skb_reset_network_header(skb); |
|
ip6h = ipv6_hdr(skb); |
|
ip6h->payload_len = htons(sizeof(ra) + sizeof(*mld2q)); |
|
ip6h->nexthdr = NEXTHDR_HOP; |
|
ip6h->hop_limit = 1; |
|
ip6h->daddr = mld2_all_node; |
|
ip6_flow_hdr(ip6h, 0, 0); |
|
|
|
if (ipv6_dev_get_saddr(amt->net, amt->dev, &ip6h->daddr, 0, |
|
&ip6h->saddr)) { |
|
amt->dev->stats.tx_errors++; |
|
kfree_skb(skb); |
|
return NULL; |
|
} |
|
|
|
eth->h_proto = htons(ETH_P_IPV6); |
|
ether_addr_copy(eth->h_source, amt->dev->dev_addr); |
|
ipv6_eth_mc_map(&mld2_all_node, eth->h_dest); |
|
|
|
skb_pull(skb, sizeof(*ip6h) + sizeof(ra)); |
|
skb_reset_transport_header(skb); |
|
mld2q = (struct mld2_query *)icmp6_hdr(skb); |
|
mld2q->mld2q_mrc = htons(1); |
|
mld2q->mld2q_type = ICMPV6_MGM_QUERY; |
|
mld2q->mld2q_code = 0; |
|
mld2q->mld2q_cksum = 0; |
|
mld2q->mld2q_resv1 = 0; |
|
mld2q->mld2q_resv2 = 0; |
|
mld2q->mld2q_suppress = 0; |
|
mld2q->mld2q_qrv = amt->qrv; |
|
mld2q->mld2q_nsrcs = 0; |
|
mld2q->mld2q_qqic = amt->qi; |
|
csum_start = (void *)mld2q; |
|
mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr, |
|
sizeof(*mld2q), |
|
IPPROTO_ICMPV6, |
|
csum_partial(csum_start, |
|
sizeof(*mld2q), 0)); |
|
|
|
skb->ip_summed = CHECKSUM_NONE; |
|
skb_push(skb, sizeof(*eth) + sizeof(*ip6h) + sizeof(ra)); |
|
return skb; |
|
} |
|
|
|
static void amt_send_mld_gq(struct amt_dev *amt, struct amt_tunnel_list *tunnel) |
|
{ |
|
struct sk_buff *skb; |
|
|
|
skb = amt_build_mld_gq(amt); |
|
if (!skb) |
|
return; |
|
|
|
amt_skb_cb(skb)->tunnel = tunnel; |
|
dev_queue_xmit(skb); |
|
} |
|
#else |
|
static void amt_send_mld_gq(struct amt_dev *amt, struct amt_tunnel_list *tunnel) |
|
{ |
|
} |
|
#endif |
|
|
|
static void amt_secret_work(struct work_struct *work) |
|
{ |
|
struct amt_dev *amt = container_of(to_delayed_work(work), |
|
struct amt_dev, |
|
secret_wq); |
|
|
|
spin_lock_bh(&amt->lock); |
|
get_random_bytes(&amt->key, sizeof(siphash_key_t)); |
|
spin_unlock_bh(&amt->lock); |
|
mod_delayed_work(amt_wq, &amt->secret_wq, |
|
msecs_to_jiffies(AMT_SECRET_TIMEOUT)); |
|
} |
|
|
|
static void amt_discovery_work(struct work_struct *work) |
|
{ |
|
struct amt_dev *amt = container_of(to_delayed_work(work), |
|
struct amt_dev, |
|
discovery_wq); |
|
|
|
spin_lock_bh(&amt->lock); |
|
if (amt->status > AMT_STATUS_SENT_DISCOVERY) |
|
goto out; |
|
get_random_bytes(&amt->nonce, sizeof(__be32)); |
|
spin_unlock_bh(&amt->lock); |
|
|
|
amt_send_discovery(amt); |
|
spin_lock_bh(&amt->lock); |
|
out: |
|
mod_delayed_work(amt_wq, &amt->discovery_wq, |
|
msecs_to_jiffies(AMT_DISCOVERY_TIMEOUT)); |
|
spin_unlock_bh(&amt->lock); |
|
} |
|
|
|
static void amt_req_work(struct work_struct *work) |
|
{ |
|
struct amt_dev *amt = container_of(to_delayed_work(work), |
|
struct amt_dev, |
|
req_wq); |
|
u32 exp; |
|
|
|
spin_lock_bh(&amt->lock); |
|
if (amt->status < AMT_STATUS_RECEIVED_ADVERTISEMENT) |
|
goto out; |
|
|
|
if (amt->req_cnt++ > AMT_MAX_REQ_COUNT) { |
|
netdev_dbg(amt->dev, "Gateway is not ready"); |
|
amt->qi = AMT_INIT_REQ_TIMEOUT; |
|
amt->ready4 = false; |
|
amt->ready6 = false; |
|
amt->remote_ip = 0; |
|
__amt_update_gw_status(amt, AMT_STATUS_INIT, false); |
|
amt->req_cnt = 0; |
|
} |
|
spin_unlock_bh(&amt->lock); |
|
|
|
amt_send_request(amt, false); |
|
amt_send_request(amt, true); |
|
amt_update_gw_status(amt, AMT_STATUS_SENT_REQUEST, true); |
|
spin_lock_bh(&amt->lock); |
|
out: |
|
exp = min_t(u32, (1 * (1 << amt->req_cnt)), AMT_MAX_REQ_TIMEOUT); |
|
mod_delayed_work(amt_wq, &amt->req_wq, msecs_to_jiffies(exp * 1000)); |
|
spin_unlock_bh(&amt->lock); |
|
} |
|
|
|
static bool amt_send_membership_update(struct amt_dev *amt, |
|
struct sk_buff *skb, |
|
bool v6) |
|
{ |
|
struct amt_header_membership_update *amtmu; |
|
struct socket *sock; |
|
struct iphdr *iph; |
|
struct flowi4 fl4; |
|
struct rtable *rt; |
|
int err; |
|
|
|
sock = rcu_dereference_bh(amt->sock); |
|
if (!sock) |
|
return true; |
|
|
|
err = skb_cow_head(skb, LL_RESERVED_SPACE(amt->dev) + sizeof(*amtmu) + |
|
sizeof(*iph) + sizeof(struct udphdr)); |
|
if (err) |
|
return true; |
|
|
|
skb_reset_inner_headers(skb); |
|
memset(&fl4, 0, sizeof(struct flowi4)); |
|
fl4.flowi4_oif = amt->stream_dev->ifindex; |
|
fl4.daddr = amt->remote_ip; |
|
fl4.saddr = amt->local_ip; |
|
fl4.flowi4_tos = AMT_TOS; |
|
fl4.flowi4_proto = IPPROTO_UDP; |
|
rt = ip_route_output_key(amt->net, &fl4); |
|
if (IS_ERR(rt)) { |
|
netdev_dbg(amt->dev, "no route to %pI4\n", &amt->remote_ip); |
|
return true; |
|
} |
|
|
|
amtmu = skb_push(skb, sizeof(*amtmu)); |
|
amtmu->version = 0; |
|
amtmu->type = AMT_MSG_MEMBERSHIP_UPDATE; |
|
amtmu->reserved = 0; |
|
amtmu->nonce = amt->nonce; |
|
amtmu->response_mac = amt->mac; |
|
|
|
if (!v6) |
|
skb_set_inner_protocol(skb, htons(ETH_P_IP)); |
|
else |
|
skb_set_inner_protocol(skb, htons(ETH_P_IPV6)); |
|
udp_tunnel_xmit_skb(rt, sock->sk, skb, |
|
fl4.saddr, |
|
fl4.daddr, |
|
AMT_TOS, |
|
ip4_dst_hoplimit(&rt->dst), |
|
0, |
|
amt->gw_port, |
|
amt->relay_port, |
|
false, |
|
false); |
|
amt_update_gw_status(amt, AMT_STATUS_SENT_UPDATE, true); |
|
return false; |
|
} |
|
|
|
static void amt_send_multicast_data(struct amt_dev *amt, |
|
const struct sk_buff *oskb, |
|
struct amt_tunnel_list *tunnel, |
|
bool v6) |
|
{ |
|
struct amt_header_mcast_data *amtmd; |
|
struct socket *sock; |
|
struct sk_buff *skb; |
|
struct iphdr *iph; |
|
struct flowi4 fl4; |
|
struct rtable *rt; |
|
|
|
sock = rcu_dereference_bh(amt->sock); |
|
if (!sock) |
|
return; |
|
|
|
skb = skb_copy_expand(oskb, sizeof(*amtmd) + sizeof(*iph) + |
|
sizeof(struct udphdr), 0, GFP_ATOMIC); |
|
if (!skb) |
|
return; |
|
|
|
skb_reset_inner_headers(skb); |
|
memset(&fl4, 0, sizeof(struct flowi4)); |
|
fl4.flowi4_oif = amt->stream_dev->ifindex; |
|
fl4.daddr = tunnel->ip4; |
|
fl4.saddr = amt->local_ip; |
|
fl4.flowi4_proto = IPPROTO_UDP; |
|
rt = ip_route_output_key(amt->net, &fl4); |
|
if (IS_ERR(rt)) { |
|
netdev_dbg(amt->dev, "no route to %pI4\n", &tunnel->ip4); |
|
kfree_skb(skb); |
|
return; |
|
} |
|
|
|
amtmd = skb_push(skb, sizeof(*amtmd)); |
|
amtmd->version = 0; |
|
amtmd->reserved = 0; |
|
amtmd->type = AMT_MSG_MULTICAST_DATA; |
|
|
|
if (!v6) |
|
skb_set_inner_protocol(skb, htons(ETH_P_IP)); |
|
else |
|
skb_set_inner_protocol(skb, htons(ETH_P_IPV6)); |
|
udp_tunnel_xmit_skb(rt, sock->sk, skb, |
|
fl4.saddr, |
|
fl4.daddr, |
|
AMT_TOS, |
|
ip4_dst_hoplimit(&rt->dst), |
|
0, |
|
amt->relay_port, |
|
tunnel->source_port, |
|
false, |
|
false); |
|
} |
|
|
|
static bool amt_send_membership_query(struct amt_dev *amt, |
|
struct sk_buff *skb, |
|
struct amt_tunnel_list *tunnel, |
|
bool v6) |
|
{ |
|
struct amt_header_membership_query *amtmq; |
|
struct socket *sock; |
|
struct rtable *rt; |
|
struct flowi4 fl4; |
|
int err; |
|
|
|
sock = rcu_dereference_bh(amt->sock); |
|
if (!sock) |
|
return true; |
|
|
|
err = skb_cow_head(skb, LL_RESERVED_SPACE(amt->dev) + sizeof(*amtmq) + |
|
sizeof(struct iphdr) + sizeof(struct udphdr)); |
|
if (err) |
|
return true; |
|
|
|
skb_reset_inner_headers(skb); |
|
memset(&fl4, 0, sizeof(struct flowi4)); |
|
fl4.flowi4_oif = amt->stream_dev->ifindex; |
|
fl4.daddr = tunnel->ip4; |
|
fl4.saddr = amt->local_ip; |
|
fl4.flowi4_tos = AMT_TOS; |
|
fl4.flowi4_proto = IPPROTO_UDP; |
|
rt = ip_route_output_key(amt->net, &fl4); |
|
if (IS_ERR(rt)) { |
|
netdev_dbg(amt->dev, "no route to %pI4\n", &tunnel->ip4); |
|
return true; |
|
} |
|
|
|
amtmq = skb_push(skb, sizeof(*amtmq)); |
|
amtmq->version = 0; |
|
amtmq->type = AMT_MSG_MEMBERSHIP_QUERY; |
|
amtmq->reserved = 0; |
|
amtmq->l = 0; |
|
amtmq->g = 0; |
|
amtmq->nonce = tunnel->nonce; |
|
amtmq->response_mac = tunnel->mac; |
|
|
|
if (!v6) |
|
skb_set_inner_protocol(skb, htons(ETH_P_IP)); |
|
else |
|
skb_set_inner_protocol(skb, htons(ETH_P_IPV6)); |
|
udp_tunnel_xmit_skb(rt, sock->sk, skb, |
|
fl4.saddr, |
|
fl4.daddr, |
|
AMT_TOS, |
|
ip4_dst_hoplimit(&rt->dst), |
|
0, |
|
amt->relay_port, |
|
tunnel->source_port, |
|
false, |
|
false); |
|
amt_update_relay_status(tunnel, AMT_STATUS_SENT_QUERY, true); |
|
return false; |
|
} |
|
|
|
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,}; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct ipv6hdr *ip6h; |
|
struct mld_msg *mld; |
|
#endif |
|
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) { |
|
if (!ipv4_is_multicast(iph->daddr)) |
|
goto free; |
|
|
|
if (!ip_mc_check_igmp(skb)) { |
|
ih = igmp_hdr(skb); |
|
switch (ih->type) { |
|
case IGMPV3_HOST_MEMBERSHIP_REPORT: |
|
case IGMP_HOST_MEMBERSHIP_REPORT: |
|
report = true; |
|
break; |
|
case IGMP_HOST_MEMBERSHIP_QUERY: |
|
query = true; |
|
break; |
|
default: |
|
goto free; |
|
} |
|
} else { |
|
data = true; |
|
} |
|
v6 = false; |
|
group.ip4 = iph->daddr; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (iph->version == 6) { |
|
ip6h = ipv6_hdr(skb); |
|
if (!ipv6_addr_is_multicast(&ip6h->daddr)) |
|
goto free; |
|
|
|
if (!ipv6_mc_check_mld(skb)) { |
|
mld = (struct mld_msg *)skb_transport_header(skb); |
|
switch (mld->mld_type) { |
|
case ICMPV6_MGM_REPORT: |
|
case ICMPV6_MLD2_REPORT: |
|
report = true; |
|
break; |
|
case ICMPV6_MGM_QUERY: |
|
query = true; |
|
break; |
|
default: |
|
goto free; |
|
} |
|
} else { |
|
data = true; |
|
} |
|
v6 = true; |
|
group.ip6 = ip6h->daddr; |
|
#endif |
|
} else { |
|
dev->stats.tx_errors++; |
|
goto free; |
|
} |
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ethhdr))) |
|
goto free; |
|
|
|
skb_pull(skb, sizeof(struct ethhdr)); |
|
|
|
if (amt->mode == AMT_MODE_GATEWAY) { |
|
/* Gateway only passes IGMP/MLD packets */ |
|
if (!report) |
|
goto free; |
|
if ((!v6 && !amt->ready4) || (v6 && !amt->ready6)) |
|
goto free; |
|
if (amt_send_membership_update(amt, skb, v6)) |
|
goto free; |
|
goto unlock; |
|
} else if (amt->mode == AMT_MODE_RELAY) { |
|
if (query) { |
|
tunnel = amt_skb_cb(skb)->tunnel; |
|
if (!tunnel) { |
|
WARN_ON(1); |
|
goto free; |
|
} |
|
|
|
/* Do not forward unexpected query */ |
|
if (amt_send_membership_query(amt, skb, tunnel, v6)) |
|
goto free; |
|
goto unlock; |
|
} |
|
|
|
if (!data) |
|
goto free; |
|
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; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else { |
|
if (ipv6_addr_equal(&gnode->group_addr.ip6, |
|
&ip6h->daddr)) |
|
goto found; |
|
#endif |
|
} |
|
} |
|
continue; |
|
found: |
|
amt_send_multicast_data(amt, skb, tunnel, v6); |
|
} |
|
} |
|
|
|
dev_kfree_skb(skb); |
|
return NETDEV_TX_OK; |
|
free: |
|
dev_kfree_skb(skb); |
|
unlock: |
|
dev->stats.tx_dropped++; |
|
return NETDEV_TX_OK; |
|
} |
|
|
|
static int amt_parse_type(struct sk_buff *skb) |
|
{ |
|
struct amt_header *amth; |
|
|
|
if (!pskb_may_pull(skb, sizeof(struct udphdr) + |
|
sizeof(struct amt_header))) |
|
return -1; |
|
|
|
amth = (struct amt_header *)(udp_hdr(skb) + 1); |
|
|
|
if (amth->version != 0) |
|
return -1; |
|
|
|
if (amth->type >= __AMT_MSG_MAX || !amth->type) |
|
return -1; |
|
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), |
|
struct amt_tunnel_list, |
|
gc_wq); |
|
struct amt_dev *amt = tunnel->amt; |
|
|
|
spin_lock_bh(&amt->lock); |
|
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); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else |
|
netdev_dbg(snode->gnode->amt->dev, |
|
"Add source as OLD %pI6 from %pI6\n", |
|
&snode->source_addr.ip6, |
|
&gnode->group_addr.ip6); |
|
#endif |
|
} |
|
} |
|
} |
|
|
|
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; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct mld2_grec *mld_grec; |
|
#endif |
|
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 { |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
mld_grec = (struct mld2_grec *)grec; |
|
nsrcs = ntohs(mld_grec->grec_nsrcs); |
|
#else |
|
return; |
|
#endif |
|
} |
|
for (i = 0; i < nsrcs; i++) { |
|
if (tunnel->nr_sources >= amt->max_sources) |
|
return; |
|
if (!v6) |
|
src.ip4 = igmp_grec->grec_src[i]; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else |
|
memcpy(&src.ip6, &mld_grec->grec_src[i], |
|
sizeof(struct in6_addr)); |
|
#endif |
|
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); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else |
|
netdev_dbg(snode->gnode->amt->dev, |
|
"Add source as NEW %pI6 from %pI6\n", |
|
&snode->source_addr.ip6, |
|
&gnode->group_addr.ip6); |
|
#endif |
|
} |
|
} |
|
} |
|
|
|
/* 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; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
struct mld2_grec *mld_grec; |
|
#endif |
|
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 { |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
mld_grec = (struct mld2_grec *)grec; |
|
nsrcs = ntohs(mld_grec->grec_nsrcs); |
|
#else |
|
return; |
|
#endif |
|
} |
|
|
|
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]; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else |
|
memcpy(&src.ip6, &mld_grec->grec_src[i], |
|
sizeof(struct in6_addr)); |
|
#endif |
|
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]; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else |
|
memcpy(&src.ip6, &mld_grec->grec_src[i], |
|
sizeof(struct in6_addr)); |
|
#endif |
|
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 IS_ENABLED(CONFIG_IPV6) |
|
else |
|
memcpy(&src.ip6, |
|
&mld_grec->grec_src[j], |
|
sizeof(struct in6_addr)); |
|
#endif |
|
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]; |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
else |
|
memcpy(&src.ip6, &mld_grec->grec_src[i], |
|
sizeof(struct in6_addr)); |
|
#endif |
|
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; |
|
} |
|
} |
|
|
|
#if IS_ENABLED(CONFIG_IPV6) |
|
/* RFC 3810 |
|
* 8.3.2. In the Presence of MLDv1 Multicast Address Listeners |
|
* |
|
* When Multicast Address Compatibility Mode is MLDv2, a router acts |
|
* using the MLDv2 protocol for that multicast address. When Multicast |
|
* Address Compatibility Mode is MLDv1, a router internally translates |
|
* the following MLDv1 messages for that multicast address to their |
|
* MLDv2 equivalents: |
|
* |
|
* MLDv1 Message MLDv2 Equivalent |
|
* -------------- ----------------- |
|
* Report IS_EX( {} ) |
|
* Done TO_IN( {} ) |
|
*/ |
|
static void amt_mldv1_report_handler(struct amt_dev *amt, struct sk_buff *skb, |
|
struct amt_tunnel_list *tunnel) |
|
{ |
|
struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb); |
|
struct ipv6hdr *ip6h = ipv6_hdr(skb); |
|
struct amt_group_node *gnode; |
|
union amt_addr group, host; |
|
|
|
memcpy(&group.ip6, &mld->mld_mca, sizeof(struct in6_addr)); |
|
memcpy(&host.ip6, &ip6h->saddr, sizeof(struct in6_addr)); |
|
|
|
gnode = amt_lookup_group(tunnel, &group, &host, true); |
|
if (!gnode) { |
|
gnode = amt_add_group(amt, tunnel, &group, &host, true); |
|
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 3810 |
|
* 8.3.2. In the Presence of MLDv1 Multicast Address Listeners |
|
* |
|
* When Multicast Address Compatibility Mode is MLDv2, a router acts |
|
* using the MLDv2 protocol for that multicast address. When Multicast |
|
* Address Compatibility Mode is MLDv1, a router internally translates |
|
* the following MLDv1 messages for that multicast address to their |
|
* MLDv2 equivalents: |
|
* |
|
* MLDv1 Message MLDv2 Equivalent |
|
* -------------- ----------------- |
|
* Report IS_EX( {} ) |
|
* Done TO_IN( {} ) |
|
*/ |
|
static void amt_mldv1_leave_handler(struct amt_dev *amt, struct sk_buff *skb, |
|
struct amt_tunnel_list *tunnel) |
|
{ |
|
struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb); |
|
struct iphdr *iph = ip_hdr(skb); |
|
struct amt_group_node *gnode; |
|
union amt_addr group, host; |
|
|
|
memcpy(&group.ip6, &mld->mld_mca, sizeof(struct in6_addr)); |
|
memset(&host, 0, sizeof(union amt_addr)); |
|
host.ip4 = iph->saddr; |
|
|
|
gnode = amt_lookup_group(tunnel, &group, &host, true); |
|
if (gnode) { |
|
amt_del_group(amt, gnode); |
|
return; |
|
} |
|
} |
|
|
|
static void amt_mldv2_report_handler(struct amt_dev *amt, struct sk_buff *skb, |
|
struct amt_tunnel_list *tunnel) |
|
{ |
|
struct mld2_report *mld2r = (struct mld2_report *)icmp6_hdr(skb); |
|
int len = skb_transport_offset(skb) + sizeof(*mld2r); |
|
void *zero_grec = (void *)&mldv2_zero_grec; |
|
struct ipv6hdr *ip6h = ipv6_hdr(skb); |
|
struct amt_group_node *gnode; |
|
union amt_addr group, host; |
|
struct mld2_grec *grec; |
|
u16 nsrcs; |
|
int i; |
|
|
|
for (i = 0; i < ntohs(mld2r->mld2r_ngrec); i++) { |
|
len += sizeof(*grec); |
|
if (!ipv6_mc_may_pull(skb, len)) |
|
break; |
|
|
|
grec = (void *)(skb->data + len - sizeof(*grec)); |
|
nsrcs = ntohs(grec->grec_nsrcs); |
|
|
|
len += nsrcs * sizeof(struct in6_addr); |
|
if (!ipv6_mc_may_pull(skb, len)) |
|
break; |
|
|
|
memset(&group, 0, sizeof(union amt_addr)); |
|
group.ip6 = grec->grec_mca; |
|
memset(&host, 0, sizeof(union amt_addr)); |
|
host.ip6 = ip6h->saddr; |
|
gnode = amt_lookup_group(tunnel, &group, &host, true); |
|
if (!gnode) { |
|
gnode = amt_add_group(amt, tunnel, &group, &host, |
|
ETH_P_IPV6); |
|
if (IS_ERR(gnode)) |
|
continue; |
|
} |
|
|
|
amt_add_srcs(amt, tunnel, gnode, grec, true); |
|
switch (grec->grec_type) { |
|
case MLD2_MODE_IS_INCLUDE: |
|
amt_mcast_is_in_handler(amt, tunnel, gnode, grec, |
|
zero_grec, true); |
|
break; |
|
case MLD2_MODE_IS_EXCLUDE: |
|
amt_mcast_is_ex_handler(amt, tunnel, gnode, grec, |
|
zero_grec, true); |
|
break; |
|
case MLD2_CHANGE_TO_INCLUDE: |
|
amt_mcast_to_in_handler(amt, tunnel, gnode, grec, |
|
zero_grec, true); |
|
break; |
|
case MLD2_CHANGE_TO_EXCLUDE: |
|
amt_mcast_to_ex_handler(amt, tunnel, gnode, grec, |
|
zero_grec, true); |
|
break; |
|
case MLD2_ALLOW_NEW_SOURCES: |
|
amt_mcast_allow_handler(amt, tunnel, gnode, grec, |
|
zero_grec, true); |
|
break; |
|
case MLD2_BLOCK_OLD_SOURCES: |
|
amt_mcast_block_handler(amt, tunnel, gnode, grec, |
|
zero_grec, true); |
|
break; |
|
default: |
|
break; |
|
} |
|
amt_cleanup_srcs(amt, tunnel, gnode); |
|
} |
|
} |
|
|
|
/* caller held tunnel->lock */ |
|
static void amt_mld_report_handler(struct amt_dev *amt, struct sk_buff *skb, |
|
struct amt_tunnel_list *tunnel) |
|
{ |
|
struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb); |
|
|
|
switch (mld->mld_type) { |
|
case ICMPV6_MGM_REPORT: |
|
amt_mldv1_report_handler(amt, skb, tunnel); |
|
break; |
|
case ICMPV6_MLD2_REPORT: |
|
amt_mldv2_report_handler(amt, skb, tunnel); |
|
break; |
|
case ICMPV6_MGM_REDUCTION: |
|
amt_mldv1_leave_handler(amt, skb, tunnel); |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
#endif |
|
|
|
static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb) |
|
{ |
|
struct amt_header_advertisement *amta; |
|
int hdr_size; |
|
|
|
hdr_size = sizeof(*amta) - sizeof(struct amt_header); |
|
|
|
if (!pskb_may_pull(skb, hdr_size)) |
|
return true; |
|
|
|
amta = (struct amt_header_advertisement *)(udp_hdr(skb) + 1); |
|
if (!amta->ip4) |
|
return true; |
|
|
|
if (amta->reserved || amta->version) |
|
return true; |
|
|
|
if (ipv4_is_loopback(amta->ip4) || ipv4_is_multicast(amta->ip4) || |
|
ipv4_is_zeronet(amta->ip4)) |
|
return true; |
|
|
|
amt->remote_ip = amta->ip4; |
|
netdev_dbg(amt->dev, "advertised remote ip = %pI4\n", &amt->remote_ip); |
|
mod_delayed_work(amt_wq, &amt->req_wq, 0); |
|
|
|
amt_update_gw_status(amt, AMT_STATUS_RECEIVED_ADVERTISEMENT, true); |
|
return false; |
|
} |
|
|
|
static bool amt_multicast_data_handler(struct amt_dev *amt, struct sk_buff *skb) |
|
{ |
|
struct amt_header_mcast_data *amtmd; |
|
int hdr_size, len, err; |
|
struct ethhdr *eth; |
|
struct iphdr *iph; |
|
|
|
amtmd = (struct amt_header_mcast_data *)(udp_hdr(skb) + 1); |
|
if (amtmd->reserved || amtmd->version) |
|
return true; |
|
|
|
hdr_size = sizeof(*amtmd) + sizeof(struct udphdr); |
|
if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_IP), false)) |
|
return true; |
|
skb_reset_network_header(skb); |
|
skb_push(skb, sizeof(*eth)); |
|
skb_reset_mac_header(skb); |
|
skb_pull(skb, sizeof(*eth)); |
|
eth = eth_hdr(skb); |
|
iph = ip_hdr(skb); |
|
if (iph->version == 4) { |
|
if (!ipv4_is_multicast(iph->daddr)) |
|
return true; |
|
skb->protocol = htons(ETH_P_IP); |
|
eth->h_proto = htons(ETH_P_IP); |
|
ip_eth_mc_map(iph->daddr, eth->h_dest); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (iph->version == 6) { |
|
struct ipv6hdr *ip6h; |
|
|
|
ip6h = ipv6_hdr(skb); |
|
if (!ipv6_addr_is_multicast(&ip6h->daddr)) |
|
return true; |
|
skb->protocol = htons(ETH_P_IPV6); |
|
eth->h_proto = htons(ETH_P_IPV6); |
|
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
|
#endif |
|
} else { |
|
return true; |
|
} |
|
|
|
skb->pkt_type = PACKET_MULTICAST; |
|
skb->ip_summed = CHECKSUM_NONE; |
|
len = skb->len; |
|
err = gro_cells_receive(&amt->gro_cells, skb); |
|
if (likely(err == NET_RX_SUCCESS)) |
|
dev_sw_netstats_rx_add(amt->dev, len); |
|
else |
|
amt->dev->stats.rx_dropped++; |
|
|
|
return false; |
|
} |
|
|
|
static bool amt_membership_query_handler(struct amt_dev *amt, |
|
struct sk_buff *skb) |
|
{ |
|
struct amt_header_membership_query *amtmq; |
|
struct igmpv3_query *ihv3; |
|
struct ethhdr *eth, *oeth; |
|
struct iphdr *iph; |
|
int hdr_size, len; |
|
|
|
hdr_size = sizeof(*amtmq) - sizeof(struct amt_header); |
|
|
|
if (!pskb_may_pull(skb, hdr_size)) |
|
return true; |
|
|
|
amtmq = (struct amt_header_membership_query *)(udp_hdr(skb) + 1); |
|
if (amtmq->reserved || amtmq->version) |
|
return true; |
|
|
|
hdr_size = sizeof(*amtmq) + sizeof(struct udphdr) - sizeof(*eth); |
|
if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_TEB), false)) |
|
return true; |
|
oeth = eth_hdr(skb); |
|
skb_reset_mac_header(skb); |
|
skb_pull(skb, sizeof(*eth)); |
|
skb_reset_network_header(skb); |
|
eth = eth_hdr(skb); |
|
iph = ip_hdr(skb); |
|
if (iph->version == 4) { |
|
if (!ipv4_is_multicast(iph->daddr)) |
|
return true; |
|
if (!pskb_may_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS + |
|
sizeof(*ihv3))) |
|
return true; |
|
|
|
ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS); |
|
skb_reset_transport_header(skb); |
|
skb_push(skb, sizeof(*iph) + AMT_IPHDR_OPTS); |
|
spin_lock_bh(&amt->lock); |
|
amt->ready4 = true; |
|
amt->mac = amtmq->response_mac; |
|
amt->req_cnt = 0; |
|
amt->qi = ihv3->qqic; |
|
spin_unlock_bh(&amt->lock); |
|
skb->protocol = htons(ETH_P_IP); |
|
eth->h_proto = htons(ETH_P_IP); |
|
ip_eth_mc_map(iph->daddr, eth->h_dest); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (iph->version == 6) { |
|
struct ipv6hdr *ip6h = ipv6_hdr(skb); |
|
struct mld2_query *mld2q; |
|
|
|
if (!ipv6_addr_is_multicast(&ip6h->daddr)) |
|
return true; |
|
if (!pskb_may_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS + |
|
sizeof(*mld2q))) |
|
return true; |
|
|
|
mld2q = skb_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS); |
|
skb_reset_transport_header(skb); |
|
skb_push(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS); |
|
spin_lock_bh(&amt->lock); |
|
amt->ready6 = true; |
|
amt->mac = amtmq->response_mac; |
|
amt->req_cnt = 0; |
|
amt->qi = mld2q->mld2q_qqic; |
|
spin_unlock_bh(&amt->lock); |
|
skb->protocol = htons(ETH_P_IPV6); |
|
eth->h_proto = htons(ETH_P_IPV6); |
|
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
|
#endif |
|
} else { |
|
return true; |
|
} |
|
|
|
ether_addr_copy(eth->h_source, oeth->h_source); |
|
skb->pkt_type = PACKET_MULTICAST; |
|
skb->ip_summed = CHECKSUM_NONE; |
|
len = skb->len; |
|
if (netif_rx(skb) == NET_RX_SUCCESS) { |
|
amt_update_gw_status(amt, AMT_STATUS_RECEIVED_QUERY, true); |
|
dev_sw_netstats_rx_add(amt->dev, len); |
|
} else { |
|
amt->dev->stats.rx_dropped++; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static bool amt_update_handler(struct amt_dev *amt, struct sk_buff *skb) |
|
{ |
|
struct amt_header_membership_update *amtmu; |
|
struct amt_tunnel_list *tunnel; |
|
struct udphdr *udph; |
|
struct ethhdr *eth; |
|
struct iphdr *iph; |
|
int len; |
|
|
|
iph = ip_hdr(skb); |
|
udph = udp_hdr(skb); |
|
|
|
if (__iptunnel_pull_header(skb, sizeof(*udph), skb->protocol, |
|
false, false)) |
|
return true; |
|
|
|
amtmu = (struct amt_header_membership_update *)skb->data; |
|
if (amtmu->reserved || amtmu->version) |
|
return true; |
|
|
|
skb_pull(skb, sizeof(*amtmu)); |
|
skb_reset_network_header(skb); |
|
|
|
list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) { |
|
if (tunnel->ip4 == iph->saddr) { |
|
if ((amtmu->nonce == tunnel->nonce && |
|
amtmu->response_mac == tunnel->mac)) { |
|
mod_delayed_work(amt_wq, &tunnel->gc_wq, |
|
msecs_to_jiffies(amt_gmi(amt)) |
|
* 3); |
|
goto report; |
|
} else { |
|
netdev_dbg(amt->dev, "Invalid MAC\n"); |
|
return true; |
|
} |
|
} |
|
} |
|
|
|
return false; |
|
|
|
report: |
|
iph = ip_hdr(skb); |
|
if (iph->version == 4) { |
|
if (ip_mc_check_igmp(skb)) { |
|
netdev_dbg(amt->dev, "Invalid IGMP\n"); |
|
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); |
|
skb->protocol = htons(ETH_P_IP); |
|
eth->h_proto = htons(ETH_P_IP); |
|
ip_eth_mc_map(iph->daddr, eth->h_dest); |
|
#if IS_ENABLED(CONFIG_IPV6) |
|
} else if (iph->version == 6) { |
|
struct ipv6hdr *ip6h = ipv6_hdr(skb); |
|
|
|
if (ipv6_mc_check_mld(skb)) { |
|
netdev_dbg(amt->dev, "Invalid MLD\n"); |
|
return true; |
|
} |
|
|
|
spin_lock_bh(&tunnel->lock); |
|
amt_mld_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); |
|
skb->protocol = htons(ETH_P_IPV6); |
|
eth->h_proto = htons(ETH_P_IPV6); |
|
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); |
|
#endif |
|
} else { |
|
netdev_dbg(amt->dev, "Unsupported Protocol\n"); |
|
return true; |
|
} |
|
|
|
skb_pull(skb, sizeof(struct ethhdr)); |
|
skb->pkt_type = PACKET_MULTICAST; |
|
skb->ip_summed = CHECKSUM_NONE; |
|
len = skb->len; |
|
if (netif_rx(skb) == NET_RX_SUCCESS) { |
|
amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_UPDATE, |
|
true); |
|
dev_sw_netstats_rx_add(amt->dev, len); |
|
} else { |
|
amt->dev->stats.rx_dropped++; |
|
} |
|
|
|
return false; |
|
} |
|
|
|
static void amt_send_advertisement(struct amt_dev *amt, __be32 nonce, |
|
__be32 daddr, __be16 dport) |
|
{ |
|
struct amt_header_advertisement *amta; |
|
int hlen, tlen, offset; |
|
struct socket *sock; |
|
struct udphdr *udph; |
|
struct sk_buff *skb; |
|
struct iphdr *iph; |
|
struct rtable *rt; |
|
struct flowi4 fl4; |
|
u32 len; |
|
int err; |
|
|
|
rcu_read_lock(); |
|
sock = rcu_dereference(amt->sock); |
|
if (!sock) |
|
goto out; |
|
|
|
if (!netif_running(amt->stream_dev) || !netif_running(amt->dev)) |
|
goto out; |
|
|
|
rt = ip_route_output_ports(amt->net, &fl4, sock->sk, |
|
daddr, amt->local_ip, |
|
dport, amt->relay_port, |
|
IPPROTO_UDP, 0, |
|
amt->stream_dev->ifindex); |
|
if (IS_ERR(rt)) { |
|
amt->dev->stats.tx_errors++; |
|
goto out; |
|
} |
|
|
|
hlen = LL_RESERVED_SPACE(amt->dev); |
|
tlen = amt->dev->needed_tailroom; |
|
len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amta); |
|
skb = netdev_alloc_skb_ip_align(amt->dev, len); |
|
if (!skb) { |
|
ip_rt_put(rt); |
|
amt->dev->stats.tx_errors++; |
|
goto out; |
|
} |
|
|
|
skb->priority = TC_PRIO_CONTROL; |
|
skb_dst_set(skb, &rt->dst); |
|
|
|
len = sizeof(*iph) + sizeof(*udph) + sizeof(*amta); |
|
skb_reset_network_header(skb); |
|
skb_put(skb, len); |
|
amta = skb_pull(skb, sizeof(*iph) + sizeof(*udph)); |
|
amta->version = 0; |
|
amta->type = AMT_MSG_ADVERTISEMENT; |
|
amta->reserved = 0; |
|
amta->nonce = nonce; |
|
amta->ip4 = amt->local_ip; |
|
skb_push(skb, sizeof(*udph)); |
|
skb_reset_transport_header(skb); |
|
udph = udp_hdr(skb); |
|
udph->source = amt->relay_port; |
|
udph->dest = dport; |
|
udph->len = htons(sizeof(*amta) + sizeof(*udph)); |
|
udph->check = 0; |
|
offset = skb_transport_offset(skb); |
|
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); |
|
udph->check = csum_tcpudp_magic(amt->local_ip, daddr, |
|
sizeof(*udph) + sizeof(*amta), |
|
IPPROTO_UDP, skb->csum); |
|
|
|
skb_push(skb, sizeof(*iph)); |
|
iph = ip_hdr(skb); |
|
iph->version = 4; |
|
iph->ihl = (sizeof(struct iphdr)) >> 2; |
|
iph->tos = AMT_TOS; |
|
iph->frag_off = 0; |
|
iph->ttl = ip4_dst_hoplimit(&rt->dst); |
|
iph->daddr = daddr; |
|
iph->saddr = amt->local_ip; |
|
iph->protocol = IPPROTO_UDP; |
|
iph->tot_len = htons(len); |
|
|
|
skb->ip_summed = CHECKSUM_NONE; |
|
ip_select_ident(amt->net, skb, NULL); |
|
ip_send_check(iph); |
|
err = ip_local_out(amt->net, sock->sk, skb); |
|
if (unlikely(net_xmit_eval(err))) |
|
amt->dev->stats.tx_errors++; |
|
|
|
out: |
|
rcu_read_unlock(); |
|
} |
|
|
|
static bool amt_discovery_handler(struct amt_dev *amt, struct sk_buff *skb) |
|
{ |
|
struct amt_header_discovery *amtd; |
|
struct udphdr *udph; |
|
struct iphdr *iph; |
|
|
|
if (!pskb_may_pull(skb, sizeof(*udph) + sizeof(*amtd))) |
|
return true; |
|
|
|
iph = ip_hdr(skb); |
|
udph = udp_hdr(skb); |
|
amtd = (struct amt_header_discovery *)(udp_hdr(skb) + 1); |
|
|
|
if (amtd->reserved || amtd->version) |
|
return true; |
|
|
|
amt_send_advertisement(amt, amtd->nonce, iph->saddr, udph->source); |
|
|
|
return false; |
|
} |
|
|
|
static bool amt_request_handler(struct amt_dev *amt, struct sk_buff *skb) |
|
{ |
|
struct amt_header_request *amtrh; |
|
struct amt_tunnel_list *tunnel; |
|
unsigned long long key; |
|
struct udphdr *udph; |
|
struct iphdr *iph; |
|
u64 mac; |
|
int i; |
|
|
|
if (!pskb_may_pull(skb, sizeof(*udph) + sizeof(*amtrh))) |
|
return true; |
|
|
|
iph = ip_hdr(skb); |
|
udph = udp_hdr(skb); |
|
amtrh = (struct amt_header_request *)(udp_hdr(skb) + 1); |
|
|
|
if (amtrh->reserved1 || amtrh->reserved2 || amtrh->version) |
|
return true; |
|
|
|
list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) |
|
if (tunnel->ip4 == iph->saddr) |
|
goto send; |
|
|
|
if (amt->nr_tunnels >= amt->max_tunnels) { |
|
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0); |
|
return true; |
|
} |
|
|
|
tunnel = kzalloc(sizeof(*tunnel) + |
|
(sizeof(struct hlist_head) * amt->hash_buckets), |
|
GFP_ATOMIC); |
|
if (!tunnel) |
|
return true; |
|
|
|
tunnel->source_port = udph->source; |
|
tunnel->ip4 = iph->saddr; |
|
|
|
memcpy(&key, &tunnel->key, sizeof(unsigned long long)); |
|
tunnel->amt = amt; |
|
spin_lock_init(&tunnel->lock); |
|
for (i = 0; i < amt->hash_buckets; i++) |
|
INIT_HLIST_HEAD(&tunnel->groups[i]); |
|
|
|
INIT_DELAYED_WORK(&tunnel->gc_wq, amt_tunnel_expire); |
|
|
|
spin_lock_bh(&amt->lock); |
|
list_add_tail_rcu(&tunnel->list, &amt->tunnel_list); |
|
tunnel->key = amt->key; |
|
amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_REQUEST, true); |
|
amt->nr_tunnels++; |
|
mod_delayed_work(amt_wq, &tunnel->gc_wq, |
|
msecs_to_jiffies(amt_gmi(amt))); |
|
spin_unlock_bh(&amt->lock); |
|
|
|
send: |
|
tunnel->nonce = amtrh->nonce; |
|
mac = siphash_3u32((__force u32)tunnel->ip4, |
|
(__force u32)tunnel->source_port, |
|
(__force u32)tunnel->nonce, |
|
&tunnel->key); |
|
tunnel->mac = mac >> 16; |
|
|
|
if (!netif_running(amt->dev) || !netif_running(amt->stream_dev)) |
|
return true; |
|
|
|
if (!amtrh->p) |
|
amt_send_igmp_gq(amt, tunnel); |
|
else |
|
amt_send_mld_gq(amt, tunnel); |
|
|
|
return false; |
|
} |
|
|
|
static int amt_rcv(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct amt_dev *amt; |
|
struct iphdr *iph; |
|
int type; |
|
bool err; |
|
|
|
rcu_read_lock_bh(); |
|
amt = rcu_dereference_sk_user_data(sk); |
|
if (!amt) { |
|
err = true; |
|
goto out; |
|
} |
|
|
|
skb->dev = amt->dev; |
|
iph = ip_hdr(skb); |
|
type = amt_parse_type(skb); |
|
if (type == -1) { |
|
err = true; |
|
goto drop; |
|
} |
|
|
|
if (amt->mode == AMT_MODE_GATEWAY) { |
|
switch (type) { |
|
case AMT_MSG_ADVERTISEMENT: |
|
if (iph->saddr != amt->discovery_ip) { |
|
netdev_dbg(amt->dev, "Invalid Relay IP\n"); |
|
err = true; |
|
goto drop; |
|
} |
|
if (amt_advertisement_handler(amt, skb)) |
|
amt->dev->stats.rx_dropped++; |
|
goto out; |
|
case AMT_MSG_MULTICAST_DATA: |
|
if (iph->saddr != amt->remote_ip) { |
|
netdev_dbg(amt->dev, "Invalid Relay IP\n"); |
|
err = true; |
|
goto drop; |
|
} |
|
err = amt_multicast_data_handler(amt, skb); |
|
if (err) |
|
goto drop; |
|
else |
|
goto out; |
|
case AMT_MSG_MEMBERSHIP_QUERY: |
|
if (iph->saddr != amt->remote_ip) { |
|
netdev_dbg(amt->dev, "Invalid Relay IP\n"); |
|
err = true; |
|
goto drop; |
|
} |
|
err = amt_membership_query_handler(amt, skb); |
|
if (err) |
|
goto drop; |
|
else |
|
goto out; |
|
default: |
|
err = true; |
|
netdev_dbg(amt->dev, "Invalid type of Gateway\n"); |
|
break; |
|
} |
|
} else { |
|
switch (type) { |
|
case AMT_MSG_DISCOVERY: |
|
err = amt_discovery_handler(amt, skb); |
|
break; |
|
case AMT_MSG_REQUEST: |
|
err = amt_request_handler(amt, skb); |
|
break; |
|
case AMT_MSG_MEMBERSHIP_UPDATE: |
|
err = amt_update_handler(amt, skb); |
|
if (err) |
|
goto drop; |
|
else |
|
goto out; |
|
default: |
|
err = true; |
|
netdev_dbg(amt->dev, "Invalid type of relay\n"); |
|
break; |
|
} |
|
} |
|
drop: |
|
if (err) { |
|
amt->dev->stats.rx_dropped++; |
|
kfree_skb(skb); |
|
} else { |
|
consume_skb(skb); |
|
} |
|
out: |
|
rcu_read_unlock_bh(); |
|
return 0; |
|
} |
|
|
|
static int amt_err_lookup(struct sock *sk, struct sk_buff *skb) |
|
{ |
|
struct amt_dev *amt; |
|
int type; |
|
|
|
rcu_read_lock_bh(); |
|
amt = rcu_dereference_sk_user_data(sk); |
|
if (!amt) |
|
goto out; |
|
|
|
if (amt->mode != AMT_MODE_GATEWAY) |
|
goto drop; |
|
|
|
type = amt_parse_type(skb); |
|
if (type == -1) |
|
goto drop; |
|
|
|
netdev_dbg(amt->dev, "Received IGMP Unreachable of %s\n", |
|
type_str[type]); |
|
switch (type) { |
|
case AMT_MSG_DISCOVERY: |
|
break; |
|
case AMT_MSG_REQUEST: |
|
case AMT_MSG_MEMBERSHIP_UPDATE: |
|
if (amt->status >= AMT_STATUS_RECEIVED_ADVERTISEMENT) |
|
mod_delayed_work(amt_wq, &amt->req_wq, 0); |
|
break; |
|
default: |
|
goto drop; |
|
} |
|
out: |
|
rcu_read_unlock_bh(); |
|
return 0; |
|
drop: |
|
rcu_read_unlock_bh(); |
|
amt->dev->stats.rx_dropped++; |
|
return 0; |
|
} |
|
|
|
static struct socket *amt_create_sock(struct net *net, __be16 port) |
|
{ |
|
struct udp_port_cfg udp_conf; |
|
struct socket *sock; |
|
int err; |
|
|
|
memset(&udp_conf, 0, sizeof(udp_conf)); |
|
udp_conf.family = AF_INET; |
|
udp_conf.local_ip.s_addr = htonl(INADDR_ANY); |
|
|
|
udp_conf.local_udp_port = port; |
|
|
|
err = udp_sock_create(net, &udp_conf, &sock); |
|
if (err < 0) |
|
return ERR_PTR(err); |
|
|
|
return sock; |
|
} |
|
|
|
static int amt_socket_create(struct amt_dev *amt) |
|
{ |
|
struct udp_tunnel_sock_cfg tunnel_cfg; |
|
struct socket *sock; |
|
|
|
sock = amt_create_sock(amt->net, amt->relay_port); |
|
if (IS_ERR(sock)) |
|
return PTR_ERR(sock); |
|
|
|
/* Mark socket as an encapsulation socket */ |
|
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg)); |
|
tunnel_cfg.sk_user_data = amt; |
|
tunnel_cfg.encap_type = 1; |
|
tunnel_cfg.encap_rcv = amt_rcv; |
|
tunnel_cfg.encap_err_lookup = amt_err_lookup; |
|
tunnel_cfg.encap_destroy = NULL; |
|
setup_udp_tunnel_sock(amt->net, sock, &tunnel_cfg); |
|
|
|
rcu_assign_pointer(amt->sock, sock); |
|
return 0; |
|
} |
|
|
|
static int amt_dev_open(struct net_device *dev) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
int err; |
|
|
|
amt->ready4 = false; |
|
amt->ready6 = false; |
|
|
|
err = amt_socket_create(amt); |
|
if (err) |
|
return err; |
|
|
|
amt->req_cnt = 0; |
|
amt->remote_ip = 0; |
|
get_random_bytes(&amt->key, sizeof(siphash_key_t)); |
|
|
|
amt->status = AMT_STATUS_INIT; |
|
if (amt->mode == AMT_MODE_GATEWAY) { |
|
mod_delayed_work(amt_wq, &amt->discovery_wq, 0); |
|
mod_delayed_work(amt_wq, &amt->req_wq, 0); |
|
} else if (amt->mode == AMT_MODE_RELAY) { |
|
mod_delayed_work(amt_wq, &amt->secret_wq, |
|
msecs_to_jiffies(AMT_SECRET_TIMEOUT)); |
|
} |
|
return err; |
|
} |
|
|
|
static int amt_dev_stop(struct net_device *dev) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
struct amt_tunnel_list *tunnel, *tmp; |
|
struct socket *sock; |
|
|
|
cancel_delayed_work_sync(&amt->req_wq); |
|
cancel_delayed_work_sync(&amt->discovery_wq); |
|
cancel_delayed_work_sync(&amt->secret_wq); |
|
|
|
/* shutdown */ |
|
sock = rtnl_dereference(amt->sock); |
|
RCU_INIT_POINTER(amt->sock, NULL); |
|
synchronize_net(); |
|
if (sock) |
|
udp_tunnel_sock_release(sock); |
|
|
|
amt->ready4 = false; |
|
amt->ready6 = false; |
|
amt->req_cnt = 0; |
|
amt->remote_ip = 0; |
|
|
|
list_for_each_entry_safe(tunnel, tmp, &amt->tunnel_list, list) { |
|
list_del_rcu(&tunnel->list); |
|
amt->nr_tunnels--; |
|
cancel_delayed_work_sync(&tunnel->gc_wq); |
|
amt_clear_groups(tunnel); |
|
kfree_rcu(tunnel, rcu); |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static const struct device_type amt_type = { |
|
.name = "amt", |
|
}; |
|
|
|
static int amt_dev_init(struct net_device *dev) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
int err; |
|
|
|
amt->dev = dev; |
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats); |
|
if (!dev->tstats) |
|
return -ENOMEM; |
|
|
|
err = gro_cells_init(&amt->gro_cells, dev); |
|
if (err) { |
|
free_percpu(dev->tstats); |
|
return err; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void amt_dev_uninit(struct net_device *dev) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
|
|
gro_cells_destroy(&amt->gro_cells); |
|
free_percpu(dev->tstats); |
|
} |
|
|
|
static const struct net_device_ops amt_netdev_ops = { |
|
.ndo_init = amt_dev_init, |
|
.ndo_uninit = amt_dev_uninit, |
|
.ndo_open = amt_dev_open, |
|
.ndo_stop = amt_dev_stop, |
|
.ndo_start_xmit = amt_dev_xmit, |
|
.ndo_get_stats64 = dev_get_tstats64, |
|
}; |
|
|
|
static void amt_link_setup(struct net_device *dev) |
|
{ |
|
dev->netdev_ops = &amt_netdev_ops; |
|
dev->needs_free_netdev = true; |
|
SET_NETDEV_DEVTYPE(dev, &amt_type); |
|
dev->min_mtu = ETH_MIN_MTU; |
|
dev->max_mtu = ETH_MAX_MTU; |
|
dev->type = ARPHRD_NONE; |
|
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST; |
|
dev->hard_header_len = 0; |
|
dev->addr_len = 0; |
|
dev->priv_flags |= IFF_NO_QUEUE; |
|
dev->features |= NETIF_F_LLTX; |
|
dev->features |= NETIF_F_GSO_SOFTWARE; |
|
dev->features |= NETIF_F_NETNS_LOCAL; |
|
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM; |
|
dev->hw_features |= NETIF_F_FRAGLIST | NETIF_F_RXCSUM; |
|
dev->hw_features |= NETIF_F_GSO_SOFTWARE; |
|
eth_hw_addr_random(dev); |
|
eth_zero_addr(dev->broadcast); |
|
ether_setup(dev); |
|
} |
|
|
|
static const struct nla_policy amt_policy[IFLA_AMT_MAX + 1] = { |
|
[IFLA_AMT_MODE] = { .type = NLA_U32 }, |
|
[IFLA_AMT_RELAY_PORT] = { .type = NLA_U16 }, |
|
[IFLA_AMT_GATEWAY_PORT] = { .type = NLA_U16 }, |
|
[IFLA_AMT_LINK] = { .type = NLA_U32 }, |
|
[IFLA_AMT_LOCAL_IP] = { .len = sizeof_field(struct iphdr, daddr) }, |
|
[IFLA_AMT_REMOTE_IP] = { .len = sizeof_field(struct iphdr, daddr) }, |
|
[IFLA_AMT_DISCOVERY_IP] = { .len = sizeof_field(struct iphdr, daddr) }, |
|
[IFLA_AMT_MAX_TUNNELS] = { .type = NLA_U32 }, |
|
}; |
|
|
|
static int amt_validate(struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
if (!data) |
|
return -EINVAL; |
|
|
|
if (!data[IFLA_AMT_LINK]) { |
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LINK], |
|
"Link attribute is required"); |
|
return -EINVAL; |
|
} |
|
|
|
if (!data[IFLA_AMT_MODE]) { |
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE], |
|
"Mode attribute is required"); |
|
return -EINVAL; |
|
} |
|
|
|
if (nla_get_u32(data[IFLA_AMT_MODE]) > AMT_MODE_MAX) { |
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE], |
|
"Mode attribute is not valid"); |
|
return -EINVAL; |
|
} |
|
|
|
if (!data[IFLA_AMT_LOCAL_IP]) { |
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_DISCOVERY_IP], |
|
"Local attribute is required"); |
|
return -EINVAL; |
|
} |
|
|
|
if (!data[IFLA_AMT_DISCOVERY_IP] && |
|
nla_get_u32(data[IFLA_AMT_MODE]) == AMT_MODE_GATEWAY) { |
|
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LOCAL_IP], |
|
"Discovery attribute is required"); |
|
return -EINVAL; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static int amt_newlink(struct net *net, struct net_device *dev, |
|
struct nlattr *tb[], struct nlattr *data[], |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
int err = -EINVAL; |
|
|
|
amt->net = net; |
|
amt->mode = nla_get_u32(data[IFLA_AMT_MODE]); |
|
|
|
if (data[IFLA_AMT_MAX_TUNNELS] && |
|
nla_get_u32(data[IFLA_AMT_MAX_TUNNELS])) |
|
amt->max_tunnels = nla_get_u32(data[IFLA_AMT_MAX_TUNNELS]); |
|
else |
|
amt->max_tunnels = AMT_MAX_TUNNELS; |
|
|
|
spin_lock_init(&amt->lock); |
|
amt->max_groups = AMT_MAX_GROUP; |
|
amt->max_sources = AMT_MAX_SOURCE; |
|
amt->hash_buckets = AMT_HSIZE; |
|
amt->nr_tunnels = 0; |
|
get_random_bytes(&amt->hash_seed, sizeof(amt->hash_seed)); |
|
amt->stream_dev = dev_get_by_index(net, |
|
nla_get_u32(data[IFLA_AMT_LINK])); |
|
if (!amt->stream_dev) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK], |
|
"Can't find stream device"); |
|
return -ENODEV; |
|
} |
|
|
|
if (amt->stream_dev->type != ARPHRD_ETHER) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK], |
|
"Invalid stream device type"); |
|
goto err; |
|
} |
|
|
|
amt->local_ip = nla_get_in_addr(data[IFLA_AMT_LOCAL_IP]); |
|
if (ipv4_is_loopback(amt->local_ip) || |
|
ipv4_is_zeronet(amt->local_ip) || |
|
ipv4_is_multicast(amt->local_ip)) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LOCAL_IP], |
|
"Invalid Local address"); |
|
goto err; |
|
} |
|
|
|
if (data[IFLA_AMT_RELAY_PORT]) |
|
amt->relay_port = nla_get_be16(data[IFLA_AMT_RELAY_PORT]); |
|
else |
|
amt->relay_port = htons(IANA_AMT_UDP_PORT); |
|
|
|
if (data[IFLA_AMT_GATEWAY_PORT]) |
|
amt->gw_port = nla_get_be16(data[IFLA_AMT_GATEWAY_PORT]); |
|
else |
|
amt->gw_port = htons(IANA_AMT_UDP_PORT); |
|
|
|
if (!amt->relay_port) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], |
|
"relay port must not be 0"); |
|
goto err; |
|
} |
|
if (amt->mode == AMT_MODE_RELAY) { |
|
amt->qrv = amt->net->ipv4.sysctl_igmp_qrv; |
|
amt->qri = 10; |
|
dev->needed_headroom = amt->stream_dev->needed_headroom + |
|
AMT_RELAY_HLEN; |
|
dev->mtu = amt->stream_dev->mtu - AMT_RELAY_HLEN; |
|
dev->max_mtu = dev->mtu; |
|
dev->min_mtu = ETH_MIN_MTU + AMT_RELAY_HLEN; |
|
} else { |
|
if (!data[IFLA_AMT_DISCOVERY_IP]) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], |
|
"discovery must be set in gateway mode"); |
|
goto err; |
|
} |
|
if (!amt->gw_port) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], |
|
"gateway port must not be 0"); |
|
goto err; |
|
} |
|
amt->remote_ip = 0; |
|
amt->discovery_ip = nla_get_in_addr(data[IFLA_AMT_DISCOVERY_IP]); |
|
if (ipv4_is_loopback(amt->discovery_ip) || |
|
ipv4_is_zeronet(amt->discovery_ip) || |
|
ipv4_is_multicast(amt->discovery_ip)) { |
|
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP], |
|
"discovery must be unicast"); |
|
goto err; |
|
} |
|
|
|
dev->needed_headroom = amt->stream_dev->needed_headroom + |
|
AMT_GW_HLEN; |
|
dev->mtu = amt->stream_dev->mtu - AMT_GW_HLEN; |
|
dev->max_mtu = dev->mtu; |
|
dev->min_mtu = ETH_MIN_MTU + AMT_GW_HLEN; |
|
} |
|
amt->qi = AMT_INIT_QUERY_INTERVAL; |
|
|
|
err = register_netdevice(dev); |
|
if (err < 0) { |
|
netdev_dbg(dev, "failed to register new netdev %d\n", err); |
|
goto err; |
|
} |
|
|
|
err = netdev_upper_dev_link(amt->stream_dev, dev, extack); |
|
if (err < 0) { |
|
unregister_netdevice(dev); |
|
goto err; |
|
} |
|
|
|
INIT_DELAYED_WORK(&amt->discovery_wq, amt_discovery_work); |
|
INIT_DELAYED_WORK(&amt->req_wq, amt_req_work); |
|
INIT_DELAYED_WORK(&amt->secret_wq, amt_secret_work); |
|
INIT_LIST_HEAD(&amt->tunnel_list); |
|
|
|
return 0; |
|
err: |
|
dev_put(amt->stream_dev); |
|
return err; |
|
} |
|
|
|
static void amt_dellink(struct net_device *dev, struct list_head *head) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
|
|
unregister_netdevice_queue(dev, head); |
|
netdev_upper_dev_unlink(amt->stream_dev, dev); |
|
dev_put(amt->stream_dev); |
|
} |
|
|
|
static size_t amt_get_size(const struct net_device *dev) |
|
{ |
|
return nla_total_size(sizeof(__u32)) + /* IFLA_AMT_MODE */ |
|
nla_total_size(sizeof(__u16)) + /* IFLA_AMT_RELAY_PORT */ |
|
nla_total_size(sizeof(__u16)) + /* IFLA_AMT_GATEWAY_PORT */ |
|
nla_total_size(sizeof(__u32)) + /* IFLA_AMT_LINK */ |
|
nla_total_size(sizeof(__u32)) + /* IFLA_MAX_TUNNELS */ |
|
nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_DISCOVERY_IP */ |
|
nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_REMOTE_IP */ |
|
nla_total_size(sizeof(struct iphdr)); /* IFLA_AMT_LOCAL_IP */ |
|
} |
|
|
|
static int amt_fill_info(struct sk_buff *skb, const struct net_device *dev) |
|
{ |
|
struct amt_dev *amt = netdev_priv(dev); |
|
|
|
if (nla_put_u32(skb, IFLA_AMT_MODE, amt->mode)) |
|
goto nla_put_failure; |
|
if (nla_put_be16(skb, IFLA_AMT_RELAY_PORT, amt->relay_port)) |
|
goto nla_put_failure; |
|
if (nla_put_be16(skb, IFLA_AMT_GATEWAY_PORT, amt->gw_port)) |
|
goto nla_put_failure; |
|
if (nla_put_u32(skb, IFLA_AMT_LINK, amt->stream_dev->ifindex)) |
|
goto nla_put_failure; |
|
if (nla_put_in_addr(skb, IFLA_AMT_LOCAL_IP, amt->local_ip)) |
|
goto nla_put_failure; |
|
if (nla_put_in_addr(skb, IFLA_AMT_DISCOVERY_IP, amt->discovery_ip)) |
|
goto nla_put_failure; |
|
if (amt->remote_ip) |
|
if (nla_put_in_addr(skb, IFLA_AMT_REMOTE_IP, amt->remote_ip)) |
|
goto nla_put_failure; |
|
if (nla_put_u32(skb, IFLA_AMT_MAX_TUNNELS, amt->max_tunnels)) |
|
goto nla_put_failure; |
|
|
|
return 0; |
|
|
|
nla_put_failure: |
|
return -EMSGSIZE; |
|
} |
|
|
|
static struct rtnl_link_ops amt_link_ops __read_mostly = { |
|
.kind = "amt", |
|
.maxtype = IFLA_AMT_MAX, |
|
.policy = amt_policy, |
|
.priv_size = sizeof(struct amt_dev), |
|
.setup = amt_link_setup, |
|
.validate = amt_validate, |
|
.newlink = amt_newlink, |
|
.dellink = amt_dellink, |
|
.get_size = amt_get_size, |
|
.fill_info = amt_fill_info, |
|
}; |
|
|
|
static struct net_device *amt_lookup_upper_dev(struct net_device *dev) |
|
{ |
|
struct net_device *upper_dev; |
|
struct amt_dev *amt; |
|
|
|
for_each_netdev(dev_net(dev), upper_dev) { |
|
if (netif_is_amt(upper_dev)) { |
|
amt = netdev_priv(upper_dev); |
|
if (amt->stream_dev == dev) |
|
return upper_dev; |
|
} |
|
} |
|
|
|
return NULL; |
|
} |
|
|
|
static int amt_device_event(struct notifier_block *unused, |
|
unsigned long event, void *ptr) |
|
{ |
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
|
struct net_device *upper_dev; |
|
struct amt_dev *amt; |
|
LIST_HEAD(list); |
|
int new_mtu; |
|
|
|
upper_dev = amt_lookup_upper_dev(dev); |
|
if (!upper_dev) |
|
return NOTIFY_DONE; |
|
amt = netdev_priv(upper_dev); |
|
|
|
switch (event) { |
|
case NETDEV_UNREGISTER: |
|
amt_dellink(amt->dev, &list); |
|
unregister_netdevice_many(&list); |
|
break; |
|
case NETDEV_CHANGEMTU: |
|
if (amt->mode == AMT_MODE_RELAY) |
|
new_mtu = dev->mtu - AMT_RELAY_HLEN; |
|
else |
|
new_mtu = dev->mtu - AMT_GW_HLEN; |
|
|
|
dev_set_mtu(amt->dev, new_mtu); |
|
break; |
|
} |
|
|
|
return NOTIFY_DONE; |
|
} |
|
|
|
static struct notifier_block amt_notifier_block __read_mostly = { |
|
.notifier_call = amt_device_event, |
|
}; |
|
|
|
static int __init amt_init(void) |
|
{ |
|
int err; |
|
|
|
err = register_netdevice_notifier(&amt_notifier_block); |
|
if (err < 0) |
|
goto err; |
|
|
|
err = rtnl_link_register(&amt_link_ops); |
|
if (err < 0) |
|
goto unregister_notifier; |
|
|
|
amt_wq = alloc_workqueue("amt", WQ_UNBOUND, 1); |
|
if (!amt_wq) { |
|
err = -ENOMEM; |
|
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: |
|
rtnl_link_unregister(&amt_link_ops); |
|
unregister_notifier: |
|
unregister_netdevice_notifier(&amt_notifier_block); |
|
err: |
|
pr_err("error loading AMT module loaded\n"); |
|
return err; |
|
} |
|
late_initcall(amt_init); |
|
|
|
static void __exit amt_fini(void) |
|
{ |
|
rtnl_link_unregister(&amt_link_ops); |
|
unregister_netdevice_notifier(&amt_notifier_block); |
|
cancel_delayed_work_sync(&source_gc_wq); |
|
__amt_source_gc_work(); |
|
destroy_workqueue(amt_wq); |
|
} |
|
module_exit(amt_fini); |
|
|
|
MODULE_LICENSE("GPL"); |
|
MODULE_AUTHOR("Taehee Yoo <[email protected]>"); |
|
MODULE_ALIAS_RTNL_LINK("amt");
|
|
|