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![Ruffalo Lavoisier](/assets/img/avatar_default.png)
Correct spelling on 'non-existent' in comment Signed-off-by: Ruffalo Lavoisier <RuffaloLavoisier@gmail.com> Link: https://lore.kernel.org/r/20220728032854.151180-1-RuffaloLavoisier@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
3455 lines
89 KiB
C
3455 lines
89 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/* Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com> */
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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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"", /* Type 0 is not defined */
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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_TEARDOWN",
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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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/* 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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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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/* Non-existent 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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if (tunnel->nr_groups >= amt->max_groups)
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return ERR_PTR(-ENOSPC);
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|
|
gnode = kzalloc(sizeof(*gnode) +
|
|
(sizeof(struct hlist_head) * amt->hash_buckets),
|
|
GFP_ATOMIC);
|
|
if (unlikely(!gnode))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
gnode->amt = amt;
|
|
gnode->group_addr = *group;
|
|
gnode->host_addr = *host;
|
|
gnode->v6 = v6;
|
|
gnode->tunnel_list = tunnel;
|
|
gnode->filter_mode = MCAST_INCLUDE;
|
|
INIT_HLIST_NODE(&gnode->node);
|
|
INIT_DELAYED_WORK(&gnode->group_timer, amt_group_work);
|
|
for (i = 0; i < amt->hash_buckets; i++)
|
|
INIT_HLIST_HEAD(&gnode->sources[i]);
|
|
|
|
hash = amt_group_hash(tunnel, group);
|
|
hlist_add_head_rcu(&gnode->node, &tunnel->groups[hash]);
|
|
tunnel->nr_groups++;
|
|
|
|
if (!gnode->v6)
|
|
netdev_dbg(amt->dev, "Join group %pI4\n",
|
|
&gnode->group_addr.ip4);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
else
|
|
netdev_dbg(amt->dev, "Join group %pI6\n",
|
|
&gnode->group_addr.ip6);
|
|
#endif
|
|
|
|
return gnode;
|
|
}
|
|
|
|
static struct sk_buff *amt_build_igmp_gq(struct amt_dev *amt)
|
|
{
|
|
u8 ra[AMT_IPHDR_OPTS] = { IPOPT_RA, 4, 0, 0 };
|
|
int hlen = LL_RESERVED_SPACE(amt->dev);
|
|
int tlen = amt->dev->needed_tailroom;
|
|
struct igmpv3_query *ihv3;
|
|
void *csum_start = NULL;
|
|
__sum16 *csum = NULL;
|
|
struct sk_buff *skb;
|
|
struct ethhdr *eth;
|
|
struct iphdr *iph;
|
|
unsigned int len;
|
|
int offset;
|
|
|
|
len = hlen + tlen + sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3);
|
|
skb = netdev_alloc_skb_ip_align(amt->dev, len);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
skb_reserve(skb, hlen);
|
|
skb_push(skb, sizeof(*eth));
|
|
skb->protocol = htons(ETH_P_IP);
|
|
skb_reset_mac_header(skb);
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
skb_put(skb, sizeof(*iph));
|
|
skb_put_data(skb, ra, sizeof(ra));
|
|
skb_put(skb, sizeof(*ihv3));
|
|
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 = READ_ONCE(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]);
|
|
WRITE_ONCE(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_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++;
|
|
|
|
amt_update_gw_status(amt, AMT_STATUS_SENT_DISCOVERY, true);
|
|
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 bool amt_queue_event(struct amt_dev *amt, enum amt_event event,
|
|
struct sk_buff *skb)
|
|
{
|
|
int index;
|
|
|
|
spin_lock_bh(&amt->lock);
|
|
if (amt->nr_events >= AMT_MAX_EVENTS) {
|
|
spin_unlock_bh(&amt->lock);
|
|
return 1;
|
|
}
|
|
|
|
index = (amt->event_idx + amt->nr_events) % AMT_MAX_EVENTS;
|
|
amt->events[index].event = event;
|
|
amt->events[index].skb = skb;
|
|
amt->nr_events++;
|
|
amt->event_idx %= AMT_MAX_EVENTS;
|
|
queue_work(amt_wq, &amt->event_wq);
|
|
spin_unlock_bh(&amt->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
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_event_send_discovery(struct amt_dev *amt)
|
|
{
|
|
if (amt->status > AMT_STATUS_SENT_DISCOVERY)
|
|
goto out;
|
|
get_random_bytes(&amt->nonce, sizeof(__be32));
|
|
|
|
amt_send_discovery(amt);
|
|
out:
|
|
mod_delayed_work(amt_wq, &amt->discovery_wq,
|
|
msecs_to_jiffies(AMT_DISCOVERY_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);
|
|
|
|
if (amt_queue_event(amt, AMT_EVENT_SEND_DISCOVERY, NULL))
|
|
mod_delayed_work(amt_wq, &amt->discovery_wq,
|
|
msecs_to_jiffies(AMT_DISCOVERY_TIMEOUT));
|
|
}
|
|
|
|
static void amt_event_send_request(struct amt_dev *amt)
|
|
{
|
|
u32 exp;
|
|
|
|
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;
|
|
WRITE_ONCE(amt->ready4, false);
|
|
WRITE_ONCE(amt->ready6, false);
|
|
amt->remote_ip = 0;
|
|
amt_update_gw_status(amt, AMT_STATUS_INIT, false);
|
|
amt->req_cnt = 0;
|
|
amt->nonce = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (!amt->req_cnt) {
|
|
WRITE_ONCE(amt->ready4, false);
|
|
WRITE_ONCE(amt->ready6, false);
|
|
get_random_bytes(&amt->nonce, sizeof(__be32));
|
|
}
|
|
|
|
amt_send_request(amt, false);
|
|
amt_send_request(amt, true);
|
|
amt_update_gw_status(amt, AMT_STATUS_SENT_REQUEST, true);
|
|
amt->req_cnt++;
|
|
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));
|
|
}
|
|
|
|
static void amt_req_work(struct work_struct *work)
|
|
{
|
|
struct amt_dev *amt = container_of(to_delayed_work(work),
|
|
struct amt_dev,
|
|
req_wq);
|
|
|
|
if (amt_queue_event(amt, AMT_EVENT_SEND_REQUEST, NULL))
|
|
mod_delayed_work(amt_wq, &amt->req_wq,
|
|
msecs_to_jiffies(100));
|
|
}
|
|
|
|
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 && !READ_ONCE(amt->ready4)) ||
|
|
(v6 && !READ_ONCE(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 = grec;
|
|
nsrcs = ntohs(igmp_grec->grec_nsrcs);
|
|
} else {
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
mld_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 = grec;
|
|
nsrcs = ntohs(igmp_grec->grec_nsrcs);
|
|
} else {
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
mld_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 udphdr);
|
|
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;
|
|
|
|
if (amt->status != AMT_STATUS_SENT_DISCOVERY ||
|
|
amt->nonce != amta->nonce)
|
|
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;
|
|
|
|
if (READ_ONCE(amt->status) != AMT_STATUS_SENT_UPDATE)
|
|
return true;
|
|
|
|
hdr_size = sizeof(*amtmd) + sizeof(struct udphdr);
|
|
if (!pskb_may_pull(skb, hdr_size))
|
|
return true;
|
|
|
|
amtmd = (struct amt_header_mcast_data *)(udp_hdr(skb) + 1);
|
|
if (amtmd->reserved || amtmd->version)
|
|
return true;
|
|
|
|
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);
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*iph)))
|
|
return true;
|
|
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;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*ip6h)))
|
|
return true;
|
|
|
|
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 udphdr);
|
|
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;
|
|
|
|
if (amtmq->nonce != amt->nonce)
|
|
return true;
|
|
|
|
hdr_size -= 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);
|
|
if (!pskb_may_pull(skb, sizeof(*iph)))
|
|
return true;
|
|
|
|
iph = ip_hdr(skb);
|
|
if (iph->version == 4) {
|
|
if (READ_ONCE(amt->ready4))
|
|
return true;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS +
|
|
sizeof(*ihv3)))
|
|
return true;
|
|
|
|
if (!ipv4_is_multicast(iph->daddr))
|
|
return true;
|
|
|
|
ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS);
|
|
skb_reset_transport_header(skb);
|
|
skb_push(skb, sizeof(*iph) + AMT_IPHDR_OPTS);
|
|
WRITE_ONCE(amt->ready4, true);
|
|
amt->mac = amtmq->response_mac;
|
|
amt->req_cnt = 0;
|
|
amt->qi = ihv3->qqic;
|
|
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 mld2_query *mld2q;
|
|
struct ipv6hdr *ip6h;
|
|
|
|
if (READ_ONCE(amt->ready6))
|
|
return true;
|
|
|
|
if (!pskb_may_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS +
|
|
sizeof(*mld2q)))
|
|
return true;
|
|
|
|
ip6h = ipv6_hdr(skb);
|
|
if (!ipv6_addr_is_multicast(&ip6h->daddr))
|
|
return true;
|
|
|
|
mld2q = skb_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS);
|
|
skb_reset_transport_header(skb);
|
|
skb_push(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS);
|
|
WRITE_ONCE(amt->ready6, true);
|
|
amt->mac = amtmq->response_mac;
|
|
amt->req_cnt = 0;
|
|
amt->qi = mld2q->mld2q_qqic;
|
|
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;
|
|
local_bh_disable();
|
|
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++;
|
|
}
|
|
local_bh_enable();
|
|
|
|
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 ethhdr *eth;
|
|
struct iphdr *iph;
|
|
int len, hdr_size;
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
hdr_size = sizeof(*amtmu) + sizeof(struct udphdr);
|
|
if (!pskb_may_pull(skb, hdr_size))
|
|
return true;
|
|
|
|
amtmu = (struct amt_header_membership_update *)(udp_hdr(skb) + 1);
|
|
if (amtmu->reserved || amtmu->version)
|
|
return true;
|
|
|
|
if (iptunnel_pull_header(skb, hdr_size, skb->protocol, false))
|
|
return true;
|
|
|
|
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 true;
|
|
|
|
report:
|
|
if (!pskb_may_pull(skb, sizeof(*iph)))
|
|
return true;
|
|
|
|
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;
|
|
|
|
spin_lock_bh(&amt->lock);
|
|
if (amt->nr_tunnels >= amt->max_tunnels) {
|
|
spin_unlock_bh(&amt->lock);
|
|
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) {
|
|
spin_unlock_bh(&amt->lock);
|
|
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);
|
|
|
|
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 void amt_gw_rcv(struct amt_dev *amt, struct sk_buff *skb)
|
|
{
|
|
int type = amt_parse_type(skb);
|
|
int err = 1;
|
|
|
|
if (type == -1)
|
|
goto drop;
|
|
|
|
if (amt->mode == AMT_MODE_GATEWAY) {
|
|
switch (type) {
|
|
case AMT_MSG_ADVERTISEMENT:
|
|
err = amt_advertisement_handler(amt, skb);
|
|
break;
|
|
case AMT_MSG_MEMBERSHIP_QUERY:
|
|
err = amt_membership_query_handler(amt, skb);
|
|
if (!err)
|
|
return;
|
|
break;
|
|
default:
|
|
netdev_dbg(amt->dev, "Invalid type of Gateway\n");
|
|
break;
|
|
}
|
|
}
|
|
drop:
|
|
if (err) {
|
|
amt->dev->stats.rx_dropped++;
|
|
kfree_skb(skb);
|
|
} else {
|
|
consume_skb(skb);
|
|
}
|
|
}
|
|
|
|
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;
|
|
kfree_skb(skb);
|
|
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_queue_event(amt, AMT_EVENT_RECEIVE, skb)) {
|
|
netdev_dbg(amt->dev, "AMT Event queue full\n");
|
|
err = true;
|
|
goto drop;
|
|
}
|
|
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;
|
|
}
|
|
if (amt_queue_event(amt, AMT_EVENT_RECEIVE, skb)) {
|
|
netdev_dbg(amt->dev, "AMT Event queue full\n");
|
|
err = true;
|
|
goto drop;
|
|
}
|
|
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 void amt_event_work(struct work_struct *work)
|
|
{
|
|
struct amt_dev *amt = container_of(work, struct amt_dev, event_wq);
|
|
struct sk_buff *skb;
|
|
u8 event;
|
|
int i;
|
|
|
|
for (i = 0; i < AMT_MAX_EVENTS; i++) {
|
|
spin_lock_bh(&amt->lock);
|
|
if (amt->nr_events == 0) {
|
|
spin_unlock_bh(&amt->lock);
|
|
return;
|
|
}
|
|
event = amt->events[amt->event_idx].event;
|
|
skb = amt->events[amt->event_idx].skb;
|
|
amt->events[amt->event_idx].event = AMT_EVENT_NONE;
|
|
amt->events[amt->event_idx].skb = NULL;
|
|
amt->nr_events--;
|
|
amt->event_idx++;
|
|
amt->event_idx %= AMT_MAX_EVENTS;
|
|
spin_unlock_bh(&amt->lock);
|
|
|
|
switch (event) {
|
|
case AMT_EVENT_RECEIVE:
|
|
amt_gw_rcv(amt, skb);
|
|
break;
|
|
case AMT_EVENT_SEND_DISCOVERY:
|
|
amt_event_send_discovery(amt);
|
|
break;
|
|
case AMT_EVENT_SEND_REQUEST:
|
|
amt_event_send_request(amt);
|
|
break;
|
|
default:
|
|
if (skb)
|
|
kfree_skb(skb);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
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 (READ_ONCE(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;
|
|
amt->event_idx = 0;
|
|
amt->nr_events = 0;
|
|
|
|
err = amt_socket_create(amt);
|
|
if (err)
|
|
return err;
|
|
|
|
amt->req_cnt = 0;
|
|
amt->remote_ip = 0;
|
|
amt->nonce = 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;
|
|
struct sk_buff *skb;
|
|
int i;
|
|
|
|
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);
|
|
|
|
cancel_work_sync(&amt->event_wq);
|
|
for (i = 0; i < AMT_MAX_EVENTS; i++) {
|
|
skb = amt->events[i].skb;
|
|
if (skb)
|
|
kfree_skb(skb);
|
|
amt->events[i].event = AMT_EVENT_NONE;
|
|
amt->events[i].skb = NULL;
|
|
}
|
|
|
|
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 = READ_ONCE(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_WORK(&amt->event_wq, amt_event_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, 0);
|
|
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 <ap420073@gmail.com>");
|
|
MODULE_ALIAS_RTNL_LINK("amt");
|