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linux/drivers/net/amt.c
Sebastian Andrzej Siewior baebdf48c3 net: dev: Makes sure netif_rx() can be invoked in any context. 
Dave suggested a while ago (eleven years by now) "Let's make netif_rx()
work in all contexts and get rid of netif_rx_ni()". Eric agreed and
pointed out that modern devices should use netif_receive_skb() to avoid
the overhead.
In the meantime someone added another variant, netif_rx_any_context(),
which behaves as suggested.

netif_rx() must be invoked with disabled bottom halves to ensure that
pending softirqs, which were raised within the function, are handled.
netif_rx_ni() can be invoked only from process context (bottom halves
must be enabled) because the function handles pending softirqs without
checking if bottom halves were disabled or not.
netif_rx_any_context() invokes on the former functions by checking
in_interrupts().

netif_rx() could be taught to handle both cases (disabled and enabled
bottom halves) by simply disabling bottom halves while invoking
netif_rx_internal(). The local_bh_enable() invocation will then invoke
pending softirqs only if the BH-disable counter drops to zero.

Eric is concerned about the overhead of BH-disable+enable especially in
regard to the loopback driver. As critical as this driver is, it will
receive a shortcut to avoid the additional overhead which is not needed.

Add a local_bh_disable() section in netif_rx() to ensure softirqs are
handled if needed.
Provide __netif_rx() which does not disable BH and has a lockdep assert
to ensure that interrupts are disabled. Use this shortcut in the
loopback driver and in drivers/net/*.c.
Make netif_rx_ni() and netif_rx_any_context() invoke netif_rx() so they
can be removed once they are no more users left.

Link: https://lkml.kernel.org/r/20100415.020246.218622820.davem@davemloft.net
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Toke Høiland-Jørgensen <toke@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2022-02-14 13:38:35 +00:00

3299 lines
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright (c) 2021 Taehee Yoo <ap420073@gmail.com> */
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/udp.h>
#include <linux/jhash.h>
#include <linux/if_tunnel.h>
#include <linux/net.h>
#include <linux/igmp.h>
#include <linux/workqueue.h>
#include <net/sch_generic.h>
#include <net/net_namespace.h>
#include <net/ip.h>
#include <net/udp.h>
#include <net/udp_tunnel.h>
#include <net/icmp.h>
#include <net/mld.h>
#include <net/amt.h>
#include <uapi/linux/amt.h>
#include <linux/security.h>
#include <net/gro_cells.h>
#include <net/ipv6.h>
#include <net/if_inet6.h>
#include <net/ndisc.h>
#include <net/addrconf.h>
#include <net/ip6_route.h>
#include <net/inet_common.h>
#include <net/ip6_checksum.h>
static struct workqueue_struct *amt_wq;
static HLIST_HEAD(source_gc_list);
/* Lock for source_gc_list */
static spinlock_t source_gc_lock;
static struct delayed_work source_gc_wq;
static char *status_str[] = {
"AMT_STATUS_INIT",
"AMT_STATUS_SENT_DISCOVERY",
"AMT_STATUS_RECEIVED_DISCOVERY",
"AMT_STATUS_SENT_ADVERTISEMENT",
"AMT_STATUS_RECEIVED_ADVERTISEMENT",
"AMT_STATUS_SENT_REQUEST",
"AMT_STATUS_RECEIVED_REQUEST",
"AMT_STATUS_SENT_QUERY",
"AMT_STATUS_RECEIVED_QUERY",
"AMT_STATUS_SENT_UPDATE",
"AMT_STATUS_RECEIVED_UPDATE",
};
static char *type_str[] = {
"AMT_MSG_DISCOVERY",
"AMT_MSG_ADVERTISEMENT",
"AMT_MSG_REQUEST",
"AMT_MSG_MEMBERSHIP_QUERY",
"AMT_MSG_MEMBERSHIP_UPDATE",
"AMT_MSG_MULTICAST_DATA",
"AMT_MSG_TEARDOWM",
};
static char *action_str[] = {
"AMT_ACT_GMI",
"AMT_ACT_GMI_ZERO",
"AMT_ACT_GT",
"AMT_ACT_STATUS_FWD_NEW",
"AMT_ACT_STATUS_D_FWD_NEW",
"AMT_ACT_STATUS_NONE_NEW",
};
static struct igmpv3_grec igmpv3_zero_grec;
#if IS_ENABLED(CONFIG_IPV6)
#define MLD2_ALL_NODE_INIT { { { 0xff, 0x02, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01 } } }
static struct in6_addr mld2_all_node = MLD2_ALL_NODE_INIT;
static struct mld2_grec mldv2_zero_grec;
#endif
static struct amt_skb_cb *amt_skb_cb(struct sk_buff *skb)
{
BUILD_BUG_ON(sizeof(struct amt_skb_cb) + sizeof(struct qdisc_skb_cb) >
sizeof_field(struct sk_buff, cb));
return (struct amt_skb_cb *)((void *)skb->cb +
sizeof(struct qdisc_skb_cb));
}
static void __amt_source_gc_work(void)
{
struct amt_source_node *snode;
struct hlist_head gc_list;
struct hlist_node *t;
spin_lock_bh(&source_gc_lock);
hlist_move_list(&source_gc_list, &gc_list);
spin_unlock_bh(&source_gc_lock);
hlist_for_each_entry_safe(snode, t, &gc_list, node) {
hlist_del_rcu(&snode->node);
kfree_rcu(snode, rcu);
}
}
static void amt_source_gc_work(struct work_struct *work)
{
__amt_source_gc_work();
spin_lock_bh(&source_gc_lock);
mod_delayed_work(amt_wq, &source_gc_wq,
msecs_to_jiffies(AMT_GC_INTERVAL));
spin_unlock_bh(&source_gc_lock);
}
static bool amt_addr_equal(union amt_addr *a, union amt_addr *b)
{
return !memcmp(a, b, sizeof(union amt_addr));
}
static u32 amt_source_hash(struct amt_tunnel_list *tunnel, union amt_addr *src)
{
u32 hash = jhash(src, sizeof(*src), tunnel->amt->hash_seed);
return reciprocal_scale(hash, tunnel->amt->hash_buckets);
}
static bool amt_status_filter(struct amt_source_node *snode,
enum amt_filter filter)
{
bool rc = false;
switch (filter) {
case AMT_FILTER_FWD:
if (snode->status == AMT_SOURCE_STATUS_FWD &&
snode->flags == AMT_SOURCE_OLD)
rc = true;
break;
case AMT_FILTER_D_FWD:
if (snode->status == AMT_SOURCE_STATUS_D_FWD &&
snode->flags == AMT_SOURCE_OLD)
rc = true;
break;
case AMT_FILTER_FWD_NEW:
if (snode->status == AMT_SOURCE_STATUS_FWD &&
snode->flags == AMT_SOURCE_NEW)
rc = true;
break;
case AMT_FILTER_D_FWD_NEW:
if (snode->status == AMT_SOURCE_STATUS_D_FWD &&
snode->flags == AMT_SOURCE_NEW)
rc = true;
break;
case AMT_FILTER_ALL:
rc = true;
break;
case AMT_FILTER_NONE_NEW:
if (snode->status == AMT_SOURCE_STATUS_NONE &&
snode->flags == AMT_SOURCE_NEW)
rc = true;
break;
case AMT_FILTER_BOTH:
if ((snode->status == AMT_SOURCE_STATUS_D_FWD ||
snode->status == AMT_SOURCE_STATUS_FWD) &&
snode->flags == AMT_SOURCE_OLD)
rc = true;
break;
case AMT_FILTER_BOTH_NEW:
if ((snode->status == AMT_SOURCE_STATUS_D_FWD ||
snode->status == AMT_SOURCE_STATUS_FWD) &&
snode->flags == AMT_SOURCE_NEW)
rc = true;
break;
default:
WARN_ON_ONCE(1);
break;
}
return rc;
}
static struct amt_source_node *amt_lookup_src(struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
enum amt_filter filter,
union amt_addr *src)
{
u32 hash = amt_source_hash(tunnel, src);
struct amt_source_node *snode;
hlist_for_each_entry_rcu(snode, &gnode->sources[hash], node)
if (amt_status_filter(snode, filter) &&
amt_addr_equal(&snode->source_addr, src))
return snode;
return NULL;
}
static u32 amt_group_hash(struct amt_tunnel_list *tunnel, union amt_addr *group)
{
u32 hash = jhash(group, sizeof(*group), tunnel->amt->hash_seed);
return reciprocal_scale(hash, tunnel->amt->hash_buckets);
}
static struct amt_group_node *amt_lookup_group(struct amt_tunnel_list *tunnel,
union amt_addr *group,
union amt_addr *host,
bool v6)
{
u32 hash = amt_group_hash(tunnel, group);
struct amt_group_node *gnode;
hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash], node) {
if (amt_addr_equal(&gnode->group_addr, group) &&
amt_addr_equal(&gnode->host_addr, host) &&
gnode->v6 == v6)
return gnode;
}
return NULL;
}
static void amt_destroy_source(struct amt_source_node *snode)
{
struct amt_group_node *gnode = snode->gnode;
struct amt_tunnel_list *tunnel;
tunnel = gnode->tunnel_list;
if (!gnode->v6) {
netdev_dbg(snode->gnode->amt->dev,
"Delete source %pI4 from %pI4\n",
&snode->source_addr.ip4,
&gnode->group_addr.ip4);
#if IS_ENABLED(CONFIG_IPV6)
} else {
netdev_dbg(snode->gnode->amt->dev,
"Delete source %pI6 from %pI6\n",
&snode->source_addr.ip6,
&gnode->group_addr.ip6);
#endif
}
cancel_delayed_work(&snode->source_timer);
hlist_del_init_rcu(&snode->node);
tunnel->nr_sources--;
gnode->nr_sources--;
spin_lock_bh(&source_gc_lock);
hlist_add_head_rcu(&snode->node, &source_gc_list);
spin_unlock_bh(&source_gc_lock);
}
static void amt_del_group(struct amt_dev *amt, struct amt_group_node *gnode)
{
struct amt_source_node *snode;
struct hlist_node *t;
int i;
if (cancel_delayed_work(&gnode->group_timer))
dev_put(amt->dev);
hlist_del_rcu(&gnode->node);
gnode->tunnel_list->nr_groups--;
if (!gnode->v6)
netdev_dbg(amt->dev, "Leave group %pI4\n",
&gnode->group_addr.ip4);
#if IS_ENABLED(CONFIG_IPV6)
else
netdev_dbg(amt->dev, "Leave group %pI6\n",
&gnode->group_addr.ip6);
#endif
for (i = 0; i < amt->hash_buckets; i++)
hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node)
amt_destroy_source(snode);
/* tunnel->lock was acquired outside of amt_del_group()
* But rcu_read_lock() was acquired too so It's safe.
*/
kfree_rcu(gnode, rcu);
}
/* If a source timer expires with a router filter-mode for the group of
* INCLUDE, the router concludes that traffic from this particular
* source is no longer desired on the attached network, and deletes the
* associated source record.
*/
static void amt_source_work(struct work_struct *work)
{
struct amt_source_node *snode = container_of(to_delayed_work(work),
struct amt_source_node,
source_timer);
struct amt_group_node *gnode = snode->gnode;
struct amt_dev *amt = gnode->amt;
struct amt_tunnel_list *tunnel;
tunnel = gnode->tunnel_list;
spin_lock_bh(&tunnel->lock);
rcu_read_lock();
if (gnode->filter_mode == MCAST_INCLUDE) {
amt_destroy_source(snode);
if (!gnode->nr_sources)
amt_del_group(amt, gnode);
} else {
/* When a router filter-mode for a group is EXCLUDE,
* source records are only deleted when the group timer expires
*/
snode->status = AMT_SOURCE_STATUS_D_FWD;
}
rcu_read_unlock();
spin_unlock_bh(&tunnel->lock);
}
static void amt_act_src(struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
struct amt_source_node *snode,
enum amt_act act)
{
struct amt_dev *amt = tunnel->amt;
switch (act) {
case AMT_ACT_GMI:
mod_delayed_work(amt_wq, &snode->source_timer,
msecs_to_jiffies(amt_gmi(amt)));
break;
case AMT_ACT_GMI_ZERO:
cancel_delayed_work(&snode->source_timer);
break;
case AMT_ACT_GT:
mod_delayed_work(amt_wq, &snode->source_timer,
gnode->group_timer.timer.expires);
break;
case AMT_ACT_STATUS_FWD_NEW:
snode->status = AMT_SOURCE_STATUS_FWD;
snode->flags = AMT_SOURCE_NEW;
break;
case AMT_ACT_STATUS_D_FWD_NEW:
snode->status = AMT_SOURCE_STATUS_D_FWD;
snode->flags = AMT_SOURCE_NEW;
break;
case AMT_ACT_STATUS_NONE_NEW:
cancel_delayed_work(&snode->source_timer);
snode->status = AMT_SOURCE_STATUS_NONE;
snode->flags = AMT_SOURCE_NEW;
break;
default:
WARN_ON_ONCE(1);
return;
}
if (!gnode->v6)
netdev_dbg(amt->dev, "Source %pI4 from %pI4 Acted %s\n",
&snode->source_addr.ip4,
&gnode->group_addr.ip4,
action_str[act]);
#if IS_ENABLED(CONFIG_IPV6)
else
netdev_dbg(amt->dev, "Source %pI6 from %pI6 Acted %s\n",
&snode->source_addr.ip6,
&gnode->group_addr.ip6,
action_str[act]);
#endif
}
static struct amt_source_node *amt_alloc_snode(struct amt_group_node *gnode,
union amt_addr *src)
{
struct amt_source_node *snode;
snode = kzalloc(sizeof(*snode), GFP_ATOMIC);
if (!snode)
return NULL;
memcpy(&snode->source_addr, src, sizeof(union amt_addr));
snode->gnode = gnode;
snode->status = AMT_SOURCE_STATUS_NONE;
snode->flags = AMT_SOURCE_NEW;
INIT_HLIST_NODE(&snode->node);
INIT_DELAYED_WORK(&snode->source_timer, amt_source_work);
return snode;
}
/* RFC 3810 - 7.2.2. Definition of Filter Timers
*
* Router Mode Filter Timer Actions/Comments
* ----------- ----------------- ----------------
*
* INCLUDE Not Used All listeners in
* INCLUDE mode.
*
* EXCLUDE Timer > 0 At least one listener
* in EXCLUDE mode.
*
* EXCLUDE Timer == 0 No more listeners in
* EXCLUDE mode for the
* multicast address.
* If the Requested List
* is empty, delete
* Multicast Address
* Record. If not, switch
* to INCLUDE filter mode;
* the sources in the
* Requested List are
* moved to the Include
* List, and the Exclude
* List is deleted.
*/
static void amt_group_work(struct work_struct *work)
{
struct amt_group_node *gnode = container_of(to_delayed_work(work),
struct amt_group_node,
group_timer);
struct amt_tunnel_list *tunnel = gnode->tunnel_list;
struct amt_dev *amt = gnode->amt;
struct amt_source_node *snode;
bool delete_group = true;
struct hlist_node *t;
int i, buckets;
buckets = amt->hash_buckets;
spin_lock_bh(&tunnel->lock);
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Not Used */
spin_unlock_bh(&tunnel->lock);
goto out;
}
rcu_read_lock();
for (i = 0; i < buckets; i++) {
hlist_for_each_entry_safe(snode, t,
&gnode->sources[i], node) {
if (!delayed_work_pending(&snode->source_timer) ||
snode->status == AMT_SOURCE_STATUS_D_FWD) {
amt_destroy_source(snode);
} else {
delete_group = false;
snode->status = AMT_SOURCE_STATUS_FWD;
}
}
}
if (delete_group)
amt_del_group(amt, gnode);
else
gnode->filter_mode = MCAST_INCLUDE;
rcu_read_unlock();
spin_unlock_bh(&tunnel->lock);
out:
dev_put(amt->dev);
}
/* Non-existant group is created as INCLUDE {empty}:
*
* RFC 3376 - 5.1. Action on Change of Interface State
*
* If no interface state existed for that multicast address before
* the change (i.e., the change consisted of creating a new
* per-interface record), or if no state exists after the change
* (i.e., the change consisted of deleting a per-interface record),
* then the "non-existent" state is considered to have a filter mode
* of INCLUDE and an empty source list.
*/
static struct amt_group_node *amt_add_group(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
union amt_addr *group,
union amt_addr *host,
bool v6)
{
struct amt_group_node *gnode;
u32 hash;
int i;
if (tunnel->nr_groups >= amt->max_groups)
return ERR_PTR(-ENOSPC);
gnode = kzalloc(sizeof(*gnode) +
(sizeof(struct hlist_head) * amt->hash_buckets),
GFP_ATOMIC);
if (unlikely(!gnode))
return ERR_PTR(-ENOMEM);
gnode->amt = amt;
gnode->group_addr = *group;
gnode->host_addr = *host;
gnode->v6 = v6;
gnode->tunnel_list = tunnel;
gnode->filter_mode = MCAST_INCLUDE;
INIT_HLIST_NODE(&gnode->node);
INIT_DELAYED_WORK(&gnode->group_timer, amt_group_work);
for (i = 0; i < amt->hash_buckets; i++)
INIT_HLIST_HEAD(&gnode->sources[i]);
hash = amt_group_hash(tunnel, group);
hlist_add_head_rcu(&gnode->node, &tunnel->groups[hash]);
tunnel->nr_groups++;
if (!gnode->v6)
netdev_dbg(amt->dev, "Join group %pI4\n",
&gnode->group_addr.ip4);
#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 = amt->net->ipv4.sysctl_igmp_qrv;
ihv3->csum = 0;
csum = &ihv3->csum;
csum_start = (void *)ihv3;
*csum = ip_compute_csum(csum_start, sizeof(*ihv3));
offset = skb_transport_offset(skb);
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
skb->ip_summed = CHECKSUM_NONE;
skb_push(skb, sizeof(*eth) + sizeof(*iph) + AMT_IPHDR_OPTS);
return skb;
}
static void __amt_update_gw_status(struct amt_dev *amt, enum amt_status status,
bool validate)
{
if (validate && amt->status >= status)
return;
netdev_dbg(amt->dev, "Update GW status %s -> %s",
status_str[amt->status], status_str[status]);
amt->status = status;
}
static void __amt_update_relay_status(struct amt_tunnel_list *tunnel,
enum amt_status status,
bool validate)
{
if (validate && tunnel->status >= status)
return;
netdev_dbg(tunnel->amt->dev,
"Update Tunnel(IP = %pI4, PORT = %u) status %s -> %s",
&tunnel->ip4, ntohs(tunnel->source_port),
status_str[tunnel->status], status_str[status]);
tunnel->status = status;
}
static void amt_update_gw_status(struct amt_dev *amt, enum amt_status status,
bool validate)
{
spin_lock_bh(&amt->lock);
__amt_update_gw_status(amt, status, validate);
spin_unlock_bh(&amt->lock);
}
static void amt_update_relay_status(struct amt_tunnel_list *tunnel,
enum amt_status status, bool validate)
{
spin_lock_bh(&tunnel->lock);
__amt_update_relay_status(tunnel, status, validate);
spin_unlock_bh(&tunnel->lock);
}
static void amt_send_discovery(struct amt_dev *amt)
{
struct amt_header_discovery *amtd;
int hlen, tlen, offset;
struct socket *sock;
struct udphdr *udph;
struct sk_buff *skb;
struct iphdr *iph;
struct rtable *rt;
struct flowi4 fl4;
u32 len;
int err;
rcu_read_lock();
sock = rcu_dereference(amt->sock);
if (!sock)
goto out;
if (!netif_running(amt->stream_dev) || !netif_running(amt->dev))
goto out;
rt = ip_route_output_ports(amt->net, &fl4, sock->sk,
amt->discovery_ip, amt->local_ip,
amt->gw_port, amt->relay_port,
IPPROTO_UDP, 0,
amt->stream_dev->ifindex);
if (IS_ERR(rt)) {
amt->dev->stats.tx_errors++;
goto out;
}
hlen = LL_RESERVED_SPACE(amt->dev);
tlen = amt->dev->needed_tailroom;
len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amtd);
skb = netdev_alloc_skb_ip_align(amt->dev, len);
if (!skb) {
ip_rt_put(rt);
amt->dev->stats.tx_errors++;
goto out;
}
skb->priority = TC_PRIO_CONTROL;
skb_dst_set(skb, &rt->dst);
len = sizeof(*iph) + sizeof(*udph) + sizeof(*amtd);
skb_reset_network_header(skb);
skb_put(skb, len);
amtd = skb_pull(skb, sizeof(*iph) + sizeof(*udph));
amtd->version = 0;
amtd->type = AMT_MSG_DISCOVERY;
amtd->reserved = 0;
amtd->nonce = amt->nonce;
skb_push(skb, sizeof(*udph));
skb_reset_transport_header(skb);
udph = udp_hdr(skb);
udph->source = amt->gw_port;
udph->dest = amt->relay_port;
udph->len = htons(sizeof(*udph) + sizeof(*amtd));
udph->check = 0;
offset = skb_transport_offset(skb);
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
udph->check = csum_tcpudp_magic(amt->local_ip, amt->discovery_ip,
sizeof(*udph) + sizeof(*amtd),
IPPROTO_UDP, skb->csum);
skb_push(skb, sizeof(*iph));
iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = (sizeof(struct iphdr)) >> 2;
iph->tos = AMT_TOS;
iph->frag_off = 0;
iph->ttl = ip4_dst_hoplimit(&rt->dst);
iph->daddr = amt->discovery_ip;
iph->saddr = amt->local_ip;
iph->protocol = IPPROTO_UDP;
iph->tot_len = htons(len);
skb->ip_summed = CHECKSUM_NONE;
ip_select_ident(amt->net, skb, NULL);
ip_send_check(iph);
err = ip_local_out(amt->net, sock->sk, skb);
if (unlikely(net_xmit_eval(err)))
amt->dev->stats.tx_errors++;
spin_lock_bh(&amt->lock);
__amt_update_gw_status(amt, AMT_STATUS_SENT_DISCOVERY, true);
spin_unlock_bh(&amt->lock);
out:
rcu_read_unlock();
}
static void amt_send_request(struct amt_dev *amt, bool v6)
{
struct amt_header_request *amtrh;
int hlen, tlen, offset;
struct socket *sock;
struct udphdr *udph;
struct sk_buff *skb;
struct iphdr *iph;
struct rtable *rt;
struct flowi4 fl4;
u32 len;
int err;
rcu_read_lock();
sock = rcu_dereference(amt->sock);
if (!sock)
goto out;
if (!netif_running(amt->stream_dev) || !netif_running(amt->dev))
goto out;
rt = ip_route_output_ports(amt->net, &fl4, sock->sk,
amt->remote_ip, amt->local_ip,
amt->gw_port, amt->relay_port,
IPPROTO_UDP, 0,
amt->stream_dev->ifindex);
if (IS_ERR(rt)) {
amt->dev->stats.tx_errors++;
goto out;
}
hlen = LL_RESERVED_SPACE(amt->dev);
tlen = amt->dev->needed_tailroom;
len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amtrh);
skb = netdev_alloc_skb_ip_align(amt->dev, len);
if (!skb) {
ip_rt_put(rt);
amt->dev->stats.tx_errors++;
goto out;
}
skb->priority = TC_PRIO_CONTROL;
skb_dst_set(skb, &rt->dst);
len = sizeof(*iph) + sizeof(*udph) + sizeof(*amtrh);
skb_reset_network_header(skb);
skb_put(skb, len);
amtrh = skb_pull(skb, sizeof(*iph) + sizeof(*udph));
amtrh->version = 0;
amtrh->type = AMT_MSG_REQUEST;
amtrh->reserved1 = 0;
amtrh->p = v6;
amtrh->reserved2 = 0;
amtrh->nonce = amt->nonce;
skb_push(skb, sizeof(*udph));
skb_reset_transport_header(skb);
udph = udp_hdr(skb);
udph->source = amt->gw_port;
udph->dest = amt->relay_port;
udph->len = htons(sizeof(*amtrh) + sizeof(*udph));
udph->check = 0;
offset = skb_transport_offset(skb);
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
udph->check = csum_tcpudp_magic(amt->local_ip, amt->remote_ip,
sizeof(*udph) + sizeof(*amtrh),
IPPROTO_UDP, skb->csum);
skb_push(skb, sizeof(*iph));
iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = (sizeof(struct iphdr)) >> 2;
iph->tos = AMT_TOS;
iph->frag_off = 0;
iph->ttl = ip4_dst_hoplimit(&rt->dst);
iph->daddr = amt->remote_ip;
iph->saddr = amt->local_ip;
iph->protocol = IPPROTO_UDP;
iph->tot_len = htons(len);
skb->ip_summed = CHECKSUM_NONE;
ip_select_ident(amt->net, skb, NULL);
ip_send_check(iph);
err = ip_local_out(amt->net, sock->sk, skb);
if (unlikely(net_xmit_eval(err)))
amt->dev->stats.tx_errors++;
out:
rcu_read_unlock();
}
static void amt_send_igmp_gq(struct amt_dev *amt,
struct amt_tunnel_list *tunnel)
{
struct sk_buff *skb;
skb = amt_build_igmp_gq(amt);
if (!skb)
return;
amt_skb_cb(skb)->tunnel = tunnel;
dev_queue_xmit(skb);
}
#if IS_ENABLED(CONFIG_IPV6)
static struct sk_buff *amt_build_mld_gq(struct amt_dev *amt)
{
u8 ra[AMT_IP6HDR_OPTS] = { IPPROTO_ICMPV6, 0, IPV6_TLV_ROUTERALERT,
2, 0, 0, IPV6_TLV_PAD1, IPV6_TLV_PAD1 };
int hlen = LL_RESERVED_SPACE(amt->dev);
int tlen = amt->dev->needed_tailroom;
struct mld2_query *mld2q;
void *csum_start = NULL;
struct ipv6hdr *ip6h;
struct sk_buff *skb;
struct ethhdr *eth;
u32 len;
len = hlen + tlen + sizeof(*ip6h) + sizeof(ra) + sizeof(*mld2q);
skb = netdev_alloc_skb_ip_align(amt->dev, len);
if (!skb)
return NULL;
skb_reserve(skb, hlen);
skb_push(skb, sizeof(*eth));
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
skb->priority = TC_PRIO_CONTROL;
skb->protocol = htons(ETH_P_IPV6);
skb_put_zero(skb, sizeof(*ip6h));
skb_put_data(skb, ra, sizeof(ra));
skb_put_zero(skb, sizeof(*mld2q));
skb_pull(skb, sizeof(*eth));
skb_reset_network_header(skb);
ip6h = ipv6_hdr(skb);
ip6h->payload_len = htons(sizeof(ra) + sizeof(*mld2q));
ip6h->nexthdr = NEXTHDR_HOP;
ip6h->hop_limit = 1;
ip6h->daddr = mld2_all_node;
ip6_flow_hdr(ip6h, 0, 0);
if (ipv6_dev_get_saddr(amt->net, amt->dev, &ip6h->daddr, 0,
&ip6h->saddr)) {
amt->dev->stats.tx_errors++;
kfree_skb(skb);
return NULL;
}
eth->h_proto = htons(ETH_P_IPV6);
ether_addr_copy(eth->h_source, amt->dev->dev_addr);
ipv6_eth_mc_map(&mld2_all_node, eth->h_dest);
skb_pull(skb, sizeof(*ip6h) + sizeof(ra));
skb_reset_transport_header(skb);
mld2q = (struct mld2_query *)icmp6_hdr(skb);
mld2q->mld2q_mrc = htons(1);
mld2q->mld2q_type = ICMPV6_MGM_QUERY;
mld2q->mld2q_code = 0;
mld2q->mld2q_cksum = 0;
mld2q->mld2q_resv1 = 0;
mld2q->mld2q_resv2 = 0;
mld2q->mld2q_suppress = 0;
mld2q->mld2q_qrv = amt->qrv;
mld2q->mld2q_nsrcs = 0;
mld2q->mld2q_qqic = amt->qi;
csum_start = (void *)mld2q;
mld2q->mld2q_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
sizeof(*mld2q),
IPPROTO_ICMPV6,
csum_partial(csum_start,
sizeof(*mld2q), 0));
skb->ip_summed = CHECKSUM_NONE;
skb_push(skb, sizeof(*eth) + sizeof(*ip6h) + sizeof(ra));
return skb;
}
static void amt_send_mld_gq(struct amt_dev *amt, struct amt_tunnel_list *tunnel)
{
struct sk_buff *skb;
skb = amt_build_mld_gq(amt);
if (!skb)
return;
amt_skb_cb(skb)->tunnel = tunnel;
dev_queue_xmit(skb);
}
#else
static void amt_send_mld_gq(struct amt_dev *amt, struct amt_tunnel_list *tunnel)
{
}
#endif
static void amt_secret_work(struct work_struct *work)
{
struct amt_dev *amt = container_of(to_delayed_work(work),
struct amt_dev,
secret_wq);
spin_lock_bh(&amt->lock);
get_random_bytes(&amt->key, sizeof(siphash_key_t));
spin_unlock_bh(&amt->lock);
mod_delayed_work(amt_wq, &amt->secret_wq,
msecs_to_jiffies(AMT_SECRET_TIMEOUT));
}
static void amt_discovery_work(struct work_struct *work)
{
struct amt_dev *amt = container_of(to_delayed_work(work),
struct amt_dev,
discovery_wq);
spin_lock_bh(&amt->lock);
if (amt->status > AMT_STATUS_SENT_DISCOVERY)
goto out;
get_random_bytes(&amt->nonce, sizeof(__be32));
spin_unlock_bh(&amt->lock);
amt_send_discovery(amt);
spin_lock_bh(&amt->lock);
out:
mod_delayed_work(amt_wq, &amt->discovery_wq,
msecs_to_jiffies(AMT_DISCOVERY_TIMEOUT));
spin_unlock_bh(&amt->lock);
}
static void amt_req_work(struct work_struct *work)
{
struct amt_dev *amt = container_of(to_delayed_work(work),
struct amt_dev,
req_wq);
u32 exp;
spin_lock_bh(&amt->lock);
if (amt->status < AMT_STATUS_RECEIVED_ADVERTISEMENT)
goto out;
if (amt->req_cnt++ > AMT_MAX_REQ_COUNT) {
netdev_dbg(amt->dev, "Gateway is not ready");
amt->qi = AMT_INIT_REQ_TIMEOUT;
amt->ready4 = false;
amt->ready6 = false;
amt->remote_ip = 0;
__amt_update_gw_status(amt, AMT_STATUS_INIT, false);
amt->req_cnt = 0;
}
spin_unlock_bh(&amt->lock);
amt_send_request(amt, false);
amt_send_request(amt, true);
amt_update_gw_status(amt, AMT_STATUS_SENT_REQUEST, true);
spin_lock_bh(&amt->lock);
out:
exp = min_t(u32, (1 * (1 << amt->req_cnt)), AMT_MAX_REQ_TIMEOUT);
mod_delayed_work(amt_wq, &amt->req_wq, msecs_to_jiffies(exp * 1000));
spin_unlock_bh(&amt->lock);
}
static bool amt_send_membership_update(struct amt_dev *amt,
struct sk_buff *skb,
bool v6)
{
struct amt_header_membership_update *amtmu;
struct socket *sock;
struct iphdr *iph;
struct flowi4 fl4;
struct rtable *rt;
int err;
sock = rcu_dereference_bh(amt->sock);
if (!sock)
return true;
err = skb_cow_head(skb, LL_RESERVED_SPACE(amt->dev) + sizeof(*amtmu) +
sizeof(*iph) + sizeof(struct udphdr));
if (err)
return true;
skb_reset_inner_headers(skb);
memset(&fl4, 0, sizeof(struct flowi4));
fl4.flowi4_oif = amt->stream_dev->ifindex;
fl4.daddr = amt->remote_ip;
fl4.saddr = amt->local_ip;
fl4.flowi4_tos = AMT_TOS;
fl4.flowi4_proto = IPPROTO_UDP;
rt = ip_route_output_key(amt->net, &fl4);
if (IS_ERR(rt)) {
netdev_dbg(amt->dev, "no route to %pI4\n", &amt->remote_ip);
return true;
}
amtmu = skb_push(skb, sizeof(*amtmu));
amtmu->version = 0;
amtmu->type = AMT_MSG_MEMBERSHIP_UPDATE;
amtmu->reserved = 0;
amtmu->nonce = amt->nonce;
amtmu->response_mac = amt->mac;
if (!v6)
skb_set_inner_protocol(skb, htons(ETH_P_IP));
else
skb_set_inner_protocol(skb, htons(ETH_P_IPV6));
udp_tunnel_xmit_skb(rt, sock->sk, skb,
fl4.saddr,
fl4.daddr,
AMT_TOS,
ip4_dst_hoplimit(&rt->dst),
0,
amt->gw_port,
amt->relay_port,
false,
false);
amt_update_gw_status(amt, AMT_STATUS_SENT_UPDATE, true);
return false;
}
static void amt_send_multicast_data(struct amt_dev *amt,
const struct sk_buff *oskb,
struct amt_tunnel_list *tunnel,
bool v6)
{
struct amt_header_mcast_data *amtmd;
struct socket *sock;
struct sk_buff *skb;
struct iphdr *iph;
struct flowi4 fl4;
struct rtable *rt;
sock = rcu_dereference_bh(amt->sock);
if (!sock)
return;
skb = skb_copy_expand(oskb, sizeof(*amtmd) + sizeof(*iph) +
sizeof(struct udphdr), 0, GFP_ATOMIC);
if (!skb)
return;
skb_reset_inner_headers(skb);
memset(&fl4, 0, sizeof(struct flowi4));
fl4.flowi4_oif = amt->stream_dev->ifindex;
fl4.daddr = tunnel->ip4;
fl4.saddr = amt->local_ip;
fl4.flowi4_proto = IPPROTO_UDP;
rt = ip_route_output_key(amt->net, &fl4);
if (IS_ERR(rt)) {
netdev_dbg(amt->dev, "no route to %pI4\n", &tunnel->ip4);
kfree_skb(skb);
return;
}
amtmd = skb_push(skb, sizeof(*amtmd));
amtmd->version = 0;
amtmd->reserved = 0;
amtmd->type = AMT_MSG_MULTICAST_DATA;
if (!v6)
skb_set_inner_protocol(skb, htons(ETH_P_IP));
else
skb_set_inner_protocol(skb, htons(ETH_P_IPV6));
udp_tunnel_xmit_skb(rt, sock->sk, skb,
fl4.saddr,
fl4.daddr,
AMT_TOS,
ip4_dst_hoplimit(&rt->dst),
0,
amt->relay_port,
tunnel->source_port,
false,
false);
}
static bool amt_send_membership_query(struct amt_dev *amt,
struct sk_buff *skb,
struct amt_tunnel_list *tunnel,
bool v6)
{
struct amt_header_membership_query *amtmq;
struct socket *sock;
struct rtable *rt;
struct flowi4 fl4;
int err;
sock = rcu_dereference_bh(amt->sock);
if (!sock)
return true;
err = skb_cow_head(skb, LL_RESERVED_SPACE(amt->dev) + sizeof(*amtmq) +
sizeof(struct iphdr) + sizeof(struct udphdr));
if (err)
return true;
skb_reset_inner_headers(skb);
memset(&fl4, 0, sizeof(struct flowi4));
fl4.flowi4_oif = amt->stream_dev->ifindex;
fl4.daddr = tunnel->ip4;
fl4.saddr = amt->local_ip;
fl4.flowi4_tos = AMT_TOS;
fl4.flowi4_proto = IPPROTO_UDP;
rt = ip_route_output_key(amt->net, &fl4);
if (IS_ERR(rt)) {
netdev_dbg(amt->dev, "no route to %pI4\n", &tunnel->ip4);
return true;
}
amtmq = skb_push(skb, sizeof(*amtmq));
amtmq->version = 0;
amtmq->type = AMT_MSG_MEMBERSHIP_QUERY;
amtmq->reserved = 0;
amtmq->l = 0;
amtmq->g = 0;
amtmq->nonce = tunnel->nonce;
amtmq->response_mac = tunnel->mac;
if (!v6)
skb_set_inner_protocol(skb, htons(ETH_P_IP));
else
skb_set_inner_protocol(skb, htons(ETH_P_IPV6));
udp_tunnel_xmit_skb(rt, sock->sk, skb,
fl4.saddr,
fl4.daddr,
AMT_TOS,
ip4_dst_hoplimit(&rt->dst),
0,
amt->relay_port,
tunnel->source_port,
false,
false);
amt_update_relay_status(tunnel, AMT_STATUS_SENT_QUERY, true);
return false;
}
static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev)
{
struct amt_dev *amt = netdev_priv(dev);
struct amt_tunnel_list *tunnel;
struct amt_group_node *gnode;
union amt_addr group = {0,};
#if IS_ENABLED(CONFIG_IPV6)
struct ipv6hdr *ip6h;
struct mld_msg *mld;
#endif
bool report = false;
struct igmphdr *ih;
bool query = false;
struct iphdr *iph;
bool data = false;
bool v6 = false;
u32 hash;
iph = ip_hdr(skb);
if (iph->version == 4) {
if (!ipv4_is_multicast(iph->daddr))
goto free;
if (!ip_mc_check_igmp(skb)) {
ih = igmp_hdr(skb);
switch (ih->type) {
case IGMPV3_HOST_MEMBERSHIP_REPORT:
case IGMP_HOST_MEMBERSHIP_REPORT:
report = true;
break;
case IGMP_HOST_MEMBERSHIP_QUERY:
query = true;
break;
default:
goto free;
}
} else {
data = true;
}
v6 = false;
group.ip4 = iph->daddr;
#if IS_ENABLED(CONFIG_IPV6)
} else if (iph->version == 6) {
ip6h = ipv6_hdr(skb);
if (!ipv6_addr_is_multicast(&ip6h->daddr))
goto free;
if (!ipv6_mc_check_mld(skb)) {
mld = (struct mld_msg *)skb_transport_header(skb);
switch (mld->mld_type) {
case ICMPV6_MGM_REPORT:
case ICMPV6_MLD2_REPORT:
report = true;
break;
case ICMPV6_MGM_QUERY:
query = true;
break;
default:
goto free;
}
} else {
data = true;
}
v6 = true;
group.ip6 = ip6h->daddr;
#endif
} else {
dev->stats.tx_errors++;
goto free;
}
if (!pskb_may_pull(skb, sizeof(struct ethhdr)))
goto free;
skb_pull(skb, sizeof(struct ethhdr));
if (amt->mode == AMT_MODE_GATEWAY) {
/* Gateway only passes IGMP/MLD packets */
if (!report)
goto free;
if ((!v6 && !amt->ready4) || (v6 && !amt->ready6))
goto free;
if (amt_send_membership_update(amt, skb, v6))
goto free;
goto unlock;
} else if (amt->mode == AMT_MODE_RELAY) {
if (query) {
tunnel = amt_skb_cb(skb)->tunnel;
if (!tunnel) {
WARN_ON(1);
goto free;
}
/* Do not forward unexpected query */
if (amt_send_membership_query(amt, skb, tunnel, v6))
goto free;
goto unlock;
}
if (!data)
goto free;
list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) {
hash = amt_group_hash(tunnel, &group);
hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash],
node) {
if (!v6) {
if (gnode->group_addr.ip4 == iph->daddr)
goto found;
#if IS_ENABLED(CONFIG_IPV6)
} else {
if (ipv6_addr_equal(&gnode->group_addr.ip6,
&ip6h->daddr))
goto found;
#endif
}
}
continue;
found:
amt_send_multicast_data(amt, skb, tunnel, v6);
}
}
dev_kfree_skb(skb);
return NETDEV_TX_OK;
free:
dev_kfree_skb(skb);
unlock:
dev->stats.tx_dropped++;
return NETDEV_TX_OK;
}
static int amt_parse_type(struct sk_buff *skb)
{
struct amt_header *amth;
if (!pskb_may_pull(skb, sizeof(struct udphdr) +
sizeof(struct amt_header)))
return -1;
amth = (struct amt_header *)(udp_hdr(skb) + 1);
if (amth->version != 0)
return -1;
if (amth->type >= __AMT_MSG_MAX || !amth->type)
return -1;
return amth->type;
}
static void amt_clear_groups(struct amt_tunnel_list *tunnel)
{
struct amt_dev *amt = tunnel->amt;
struct amt_group_node *gnode;
struct hlist_node *t;
int i;
spin_lock_bh(&tunnel->lock);
rcu_read_lock();
for (i = 0; i < amt->hash_buckets; i++)
hlist_for_each_entry_safe(gnode, t, &tunnel->groups[i], node)
amt_del_group(amt, gnode);
rcu_read_unlock();
spin_unlock_bh(&tunnel->lock);
}
static void amt_tunnel_expire(struct work_struct *work)
{
struct amt_tunnel_list *tunnel = container_of(to_delayed_work(work),
struct amt_tunnel_list,
gc_wq);
struct amt_dev *amt = tunnel->amt;
spin_lock_bh(&amt->lock);
rcu_read_lock();
list_del_rcu(&tunnel->list);
amt->nr_tunnels--;
amt_clear_groups(tunnel);
rcu_read_unlock();
spin_unlock_bh(&amt->lock);
kfree_rcu(tunnel, rcu);
}
static void amt_cleanup_srcs(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode)
{
struct amt_source_node *snode;
struct hlist_node *t;
int i;
/* Delete old sources */
for (i = 0; i < amt->hash_buckets; i++) {
hlist_for_each_entry_safe(snode, t, &gnode->sources[i], node) {
if (snode->flags == AMT_SOURCE_OLD)
amt_destroy_source(snode);
}
}
/* switch from new to old */
for (i = 0; i < amt->hash_buckets; i++) {
hlist_for_each_entry_rcu(snode, &gnode->sources[i], node) {
snode->flags = AMT_SOURCE_OLD;
if (!gnode->v6)
netdev_dbg(snode->gnode->amt->dev,
"Add source as OLD %pI4 from %pI4\n",
&snode->source_addr.ip4,
&gnode->group_addr.ip4);
#if IS_ENABLED(CONFIG_IPV6)
else
netdev_dbg(snode->gnode->amt->dev,
"Add source as OLD %pI6 from %pI6\n",
&snode->source_addr.ip6,
&gnode->group_addr.ip6);
#endif
}
}
}
static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode, void *grec,
bool v6)
{
struct igmpv3_grec *igmp_grec;
struct amt_source_node *snode;
#if IS_ENABLED(CONFIG_IPV6)
struct mld2_grec *mld_grec;
#endif
union amt_addr src = {0,};
u16 nsrcs;
u32 hash;
int i;
if (!v6) {
igmp_grec = (struct igmpv3_grec *)grec;
nsrcs = ntohs(igmp_grec->grec_nsrcs);
} else {
#if IS_ENABLED(CONFIG_IPV6)
mld_grec = (struct mld2_grec *)grec;
nsrcs = ntohs(mld_grec->grec_nsrcs);
#else
return;
#endif
}
for (i = 0; i < nsrcs; i++) {
if (tunnel->nr_sources >= amt->max_sources)
return;
if (!v6)
src.ip4 = igmp_grec->grec_src[i];
#if IS_ENABLED(CONFIG_IPV6)
else
memcpy(&src.ip6, &mld_grec->grec_src[i],
sizeof(struct in6_addr));
#endif
if (amt_lookup_src(tunnel, gnode, AMT_FILTER_ALL, &src))
continue;
snode = amt_alloc_snode(gnode, &src);
if (snode) {
hash = amt_source_hash(tunnel, &snode->source_addr);
hlist_add_head_rcu(&snode->node, &gnode->sources[hash]);
tunnel->nr_sources++;
gnode->nr_sources++;
if (!gnode->v6)
netdev_dbg(snode->gnode->amt->dev,
"Add source as NEW %pI4 from %pI4\n",
&snode->source_addr.ip4,
&gnode->group_addr.ip4);
#if IS_ENABLED(CONFIG_IPV6)
else
netdev_dbg(snode->gnode->amt->dev,
"Add source as NEW %pI6 from %pI6\n",
&snode->source_addr.ip6,
&gnode->group_addr.ip6);
#endif
}
}
}
/* Router State Report Rec'd New Router State
* ------------ ------------ ----------------
* EXCLUDE (X,Y) IS_IN (A) EXCLUDE (X+A,Y-A)
*
* -----------+-----------+-----------+
* | OLD | NEW |
* -----------+-----------+-----------+
* FWD | X | X+A |
* -----------+-----------+-----------+
* D_FWD | Y | Y-A |
* -----------+-----------+-----------+
* NONE | | A |
* -----------+-----------+-----------+
*
* a) Received sources are NONE/NEW
* b) All NONE will be deleted by amt_cleanup_srcs().
* c) All OLD will be deleted by amt_cleanup_srcs().
* d) After delete, NEW source will be switched to OLD.
*/
static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec,
enum amt_ops ops,
enum amt_filter filter,
enum amt_act act,
bool v6)
{
struct amt_dev *amt = tunnel->amt;
struct amt_source_node *snode;
struct igmpv3_grec *igmp_grec;
#if IS_ENABLED(CONFIG_IPV6)
struct mld2_grec *mld_grec;
#endif
union amt_addr src = {0,};
struct hlist_node *t;
u16 nsrcs;
int i, j;
if (!v6) {
igmp_grec = (struct igmpv3_grec *)grec;
nsrcs = ntohs(igmp_grec->grec_nsrcs);
} else {
#if IS_ENABLED(CONFIG_IPV6)
mld_grec = (struct mld2_grec *)grec;
nsrcs = ntohs(mld_grec->grec_nsrcs);
#else
return;
#endif
}
memset(&src, 0, sizeof(union amt_addr));
switch (ops) {
case AMT_OPS_INT:
/* A*B */
for (i = 0; i < nsrcs; i++) {
if (!v6)
src.ip4 = igmp_grec->grec_src[i];
#if IS_ENABLED(CONFIG_IPV6)
else
memcpy(&src.ip6, &mld_grec->grec_src[i],
sizeof(struct in6_addr));
#endif
snode = amt_lookup_src(tunnel, gnode, filter, &src);
if (!snode)
continue;
amt_act_src(tunnel, gnode, snode, act);
}
break;
case AMT_OPS_UNI:
/* A+B */
for (i = 0; i < amt->hash_buckets; i++) {
hlist_for_each_entry_safe(snode, t, &gnode->sources[i],
node) {
if (amt_status_filter(snode, filter))
amt_act_src(tunnel, gnode, snode, act);
}
}
for (i = 0; i < nsrcs; i++) {
if (!v6)
src.ip4 = igmp_grec->grec_src[i];
#if IS_ENABLED(CONFIG_IPV6)
else
memcpy(&src.ip6, &mld_grec->grec_src[i],
sizeof(struct in6_addr));
#endif
snode = amt_lookup_src(tunnel, gnode, filter, &src);
if (!snode)
continue;
amt_act_src(tunnel, gnode, snode, act);
}
break;
case AMT_OPS_SUB:
/* A-B */
for (i = 0; i < amt->hash_buckets; i++) {
hlist_for_each_entry_safe(snode, t, &gnode->sources[i],
node) {
if (!amt_status_filter(snode, filter))
continue;
for (j = 0; j < nsrcs; j++) {
if (!v6)
src.ip4 = igmp_grec->grec_src[j];
#if IS_ENABLED(CONFIG_IPV6)
else
memcpy(&src.ip6,
&mld_grec->grec_src[j],
sizeof(struct in6_addr));
#endif
if (amt_addr_equal(&snode->source_addr,
&src))
goto out_sub;
}
amt_act_src(tunnel, gnode, snode, act);
continue;
out_sub:;
}
}
break;
case AMT_OPS_SUB_REV:
/* B-A */
for (i = 0; i < nsrcs; i++) {
if (!v6)
src.ip4 = igmp_grec->grec_src[i];
#if IS_ENABLED(CONFIG_IPV6)
else
memcpy(&src.ip6, &mld_grec->grec_src[i],
sizeof(struct in6_addr));
#endif
snode = amt_lookup_src(tunnel, gnode, AMT_FILTER_ALL,
&src);
if (!snode) {
snode = amt_lookup_src(tunnel, gnode,
filter, &src);
if (snode)
amt_act_src(tunnel, gnode, snode, act);
}
}
break;
default:
netdev_dbg(amt->dev, "Invalid type\n");
return;
}
}
static void amt_mcast_is_in_handler(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec, void *zero_grec, bool v6)
{
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* INCLUDE (A) IS_IN (B) INCLUDE (A+B) (B)=GMI
*/
/* Update IS_IN (B) as FWD/NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_NONE_NEW,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* Update INCLUDE (A) as NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* (B)=GMI */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD_NEW,
AMT_ACT_GMI,
v6);
} else {
/* State Actions
* ------------ ------------ ---------------- -------
* EXCLUDE (X,Y) IS_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
*/
/* Update (A) in (X, Y) as NONE/NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_BOTH,
AMT_ACT_STATUS_NONE_NEW,
v6);
/* Update FWD/OLD as FWD/NEW */
amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* Update IS_IN (A) as FWD/NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_NONE_NEW,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* Update EXCLUDE (, Y-A) as D_FWD_NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
}
}
static void amt_mcast_is_ex_handler(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec, void *zero_grec, bool v6)
{
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* INCLUDE (A) IS_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
* Delete (A-B)
* Group Timer=GMI
*/
/* EXCLUDE(A*B, ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE(, B-A) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
/* (B-A)=0 */
amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI,
AMT_FILTER_D_FWD_NEW,
AMT_ACT_GMI_ZERO,
v6);
/* Group Timer=GMI */
if (!mod_delayed_work(amt_wq, &gnode->group_timer,
msecs_to_jiffies(amt_gmi(amt))))
dev_hold(amt->dev);
gnode->filter_mode = MCAST_EXCLUDE;
/* Delete (A-B) will be worked by amt_cleanup_srcs(). */
} else {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* EXCLUDE (X,Y) IS_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=GMI
* Delete (X-A)
* Delete (Y-A)
* Group Timer=GMI
*/
/* EXCLUDE (A-Y, ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (, Y*A ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
/* (A-X-Y)=GMI */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_BOTH_NEW,
AMT_ACT_GMI,
v6);
/* Group Timer=GMI */
if (!mod_delayed_work(amt_wq, &gnode->group_timer,
msecs_to_jiffies(amt_gmi(amt))))
dev_hold(amt->dev);
/* Delete (X-A), (Y-A) will be worked by amt_cleanup_srcs(). */
}
}
static void amt_mcast_to_in_handler(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec, void *zero_grec, bool v6)
{
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* INCLUDE (A) TO_IN (B) INCLUDE (A+B) (B)=GMI
* Send Q(G,A-B)
*/
/* Update TO_IN (B) sources as FWD/NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_NONE_NEW,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* Update INCLUDE (A) sources as NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* (B)=GMI */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD_NEW,
AMT_ACT_GMI,
v6);
} else {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* EXCLUDE (X,Y) TO_IN (A) EXCLUDE (X+A,Y-A) (A)=GMI
* Send Q(G,X-A)
* Send Q(G)
*/
/* Update TO_IN (A) sources as FWD/NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_NONE_NEW,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* Update EXCLUDE(X,) sources as FWD/NEW */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (, Y-A)
* (A) are already switched to FWD_NEW.
* So, D_FWD/OLD -> D_FWD/NEW is okay.
*/
amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
/* (A)=GMI
* Only FWD_NEW will have (A) sources.
*/
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD_NEW,
AMT_ACT_GMI,
v6);
}
}
static void amt_mcast_to_ex_handler(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec, void *zero_grec, bool v6)
{
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* INCLUDE (A) TO_EX (B) EXCLUDE (A*B,B-A) (B-A)=0
* Delete (A-B)
* Send Q(G,A*B)
* Group Timer=GMI
*/
/* EXCLUDE (A*B, ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (, B-A) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
/* (B-A)=0 */
amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI,
AMT_FILTER_D_FWD_NEW,
AMT_ACT_GMI_ZERO,
v6);
/* Group Timer=GMI */
if (!mod_delayed_work(amt_wq, &gnode->group_timer,
msecs_to_jiffies(amt_gmi(amt))))
dev_hold(amt->dev);
gnode->filter_mode = MCAST_EXCLUDE;
/* Delete (A-B) will be worked by amt_cleanup_srcs(). */
} else {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* EXCLUDE (X,Y) TO_EX (A) EXCLUDE (A-Y,Y*A) (A-X-Y)=Group Timer
* Delete (X-A)
* Delete (Y-A)
* Send Q(G,A-Y)
* Group Timer=GMI
*/
/* Update (A-X-Y) as NONE/OLD */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_BOTH,
AMT_ACT_GT,
v6);
/* EXCLUDE (A-Y, ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (, Y*A) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
/* Group Timer=GMI */
if (!mod_delayed_work(amt_wq, &gnode->group_timer,
msecs_to_jiffies(amt_gmi(amt))))
dev_hold(amt->dev);
/* Delete (X-A), (Y-A) will be worked by amt_cleanup_srcs(). */
}
}
static void amt_mcast_allow_handler(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec, void *zero_grec, bool v6)
{
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* INCLUDE (A) ALLOW (B) INCLUDE (A+B) (B)=GMI
*/
/* INCLUDE (A+B) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* (B)=GMI */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD_NEW,
AMT_ACT_GMI,
v6);
} else {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* EXCLUDE (X,Y) ALLOW (A) EXCLUDE (X+A,Y-A) (A)=GMI
*/
/* EXCLUDE (X+A, ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (, Y-A) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
/* (A)=GMI
* All (A) source are now FWD/NEW status.
*/
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_INT,
AMT_FILTER_FWD_NEW,
AMT_ACT_GMI,
v6);
}
}
static void amt_mcast_block_handler(struct amt_dev *amt,
struct amt_tunnel_list *tunnel,
struct amt_group_node *gnode,
void *grec, void *zero_grec, bool v6)
{
if (gnode->filter_mode == MCAST_INCLUDE) {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* INCLUDE (A) BLOCK (B) INCLUDE (A) Send Q(G,A*B)
*/
/* INCLUDE (A) */
amt_lookup_act_srcs(tunnel, gnode, zero_grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
} else {
/* Router State Report Rec'd New Router State Actions
* ------------ ------------ ---------------- -------
* EXCLUDE (X,Y) BLOCK (A) EXCLUDE (X+(A-Y),Y) (A-X-Y)=Group Timer
* Send Q(G,A-Y)
*/
/* (A-X-Y)=Group Timer */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_BOTH,
AMT_ACT_GT,
v6);
/* EXCLUDE (X, ) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (X+(A-Y) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_SUB_REV,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_FWD_NEW,
v6);
/* EXCLUDE (, Y) */
amt_lookup_act_srcs(tunnel, gnode, grec, AMT_OPS_UNI,
AMT_FILTER_D_FWD,
AMT_ACT_STATUS_D_FWD_NEW,
v6);
}
}
/* RFC 3376
* 7.3.2. In the Presence of Older Version Group Members
*
* When Group Compatibility Mode is IGMPv2, a router internally
* translates the following IGMPv2 messages for that group to their
* IGMPv3 equivalents:
*
* IGMPv2 Message IGMPv3 Equivalent
* -------------- -----------------
* Report IS_EX( {} )
* Leave TO_IN( {} )
*/
static void amt_igmpv2_report_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct igmphdr *ih = igmp_hdr(skb);
struct iphdr *iph = ip_hdr(skb);
struct amt_group_node *gnode;
union amt_addr group, host;
memset(&group, 0, sizeof(union amt_addr));
group.ip4 = ih->group;
memset(&host, 0, sizeof(union amt_addr));
host.ip4 = iph->saddr;
gnode = amt_lookup_group(tunnel, &group, &host, false);
if (!gnode) {
gnode = amt_add_group(amt, tunnel, &group, &host, false);
if (!IS_ERR(gnode)) {
gnode->filter_mode = MCAST_EXCLUDE;
if (!mod_delayed_work(amt_wq, &gnode->group_timer,
msecs_to_jiffies(amt_gmi(amt))))
dev_hold(amt->dev);
}
}
}
/* RFC 3376
* 7.3.2. In the Presence of Older Version Group Members
*
* When Group Compatibility Mode is IGMPv2, a router internally
* translates the following IGMPv2 messages for that group to their
* IGMPv3 equivalents:
*
* IGMPv2 Message IGMPv3 Equivalent
* -------------- -----------------
* Report IS_EX( {} )
* Leave TO_IN( {} )
*/
static void amt_igmpv2_leave_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct igmphdr *ih = igmp_hdr(skb);
struct iphdr *iph = ip_hdr(skb);
struct amt_group_node *gnode;
union amt_addr group, host;
memset(&group, 0, sizeof(union amt_addr));
group.ip4 = ih->group;
memset(&host, 0, sizeof(union amt_addr));
host.ip4 = iph->saddr;
gnode = amt_lookup_group(tunnel, &group, &host, false);
if (gnode)
amt_del_group(amt, gnode);
}
static void amt_igmpv3_report_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct igmpv3_report *ihrv3 = igmpv3_report_hdr(skb);
int len = skb_transport_offset(skb) + sizeof(*ihrv3);
void *zero_grec = (void *)&igmpv3_zero_grec;
struct iphdr *iph = ip_hdr(skb);
struct amt_group_node *gnode;
union amt_addr group, host;
struct igmpv3_grec *grec;
u16 nsrcs;
int i;
for (i = 0; i < ntohs(ihrv3->ngrec); i++) {
len += sizeof(*grec);
if (!ip_mc_may_pull(skb, len))
break;
grec = (void *)(skb->data + len - sizeof(*grec));
nsrcs = ntohs(grec->grec_nsrcs);
len += nsrcs * sizeof(__be32);
if (!ip_mc_may_pull(skb, len))
break;
memset(&group, 0, sizeof(union amt_addr));
group.ip4 = grec->grec_mca;
memset(&host, 0, sizeof(union amt_addr));
host.ip4 = iph->saddr;
gnode = amt_lookup_group(tunnel, &group, &host, false);
if (!gnode) {
gnode = amt_add_group(amt, tunnel, &group, &host,
false);
if (IS_ERR(gnode))
continue;
}
amt_add_srcs(amt, tunnel, gnode, grec, false);
switch (grec->grec_type) {
case IGMPV3_MODE_IS_INCLUDE:
amt_mcast_is_in_handler(amt, tunnel, gnode, grec,
zero_grec, false);
break;
case IGMPV3_MODE_IS_EXCLUDE:
amt_mcast_is_ex_handler(amt, tunnel, gnode, grec,
zero_grec, false);
break;
case IGMPV3_CHANGE_TO_INCLUDE:
amt_mcast_to_in_handler(amt, tunnel, gnode, grec,
zero_grec, false);
break;
case IGMPV3_CHANGE_TO_EXCLUDE:
amt_mcast_to_ex_handler(amt, tunnel, gnode, grec,
zero_grec, false);
break;
case IGMPV3_ALLOW_NEW_SOURCES:
amt_mcast_allow_handler(amt, tunnel, gnode, grec,
zero_grec, false);
break;
case IGMPV3_BLOCK_OLD_SOURCES:
amt_mcast_block_handler(amt, tunnel, gnode, grec,
zero_grec, false);
break;
default:
break;
}
amt_cleanup_srcs(amt, tunnel, gnode);
}
}
/* caller held tunnel->lock */
static void amt_igmp_report_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct igmphdr *ih = igmp_hdr(skb);
switch (ih->type) {
case IGMPV3_HOST_MEMBERSHIP_REPORT:
amt_igmpv3_report_handler(amt, skb, tunnel);
break;
case IGMPV2_HOST_MEMBERSHIP_REPORT:
amt_igmpv2_report_handler(amt, skb, tunnel);
break;
case IGMP_HOST_LEAVE_MESSAGE:
amt_igmpv2_leave_handler(amt, skb, tunnel);
break;
default:
break;
}
}
#if IS_ENABLED(CONFIG_IPV6)
/* RFC 3810
* 8.3.2. In the Presence of MLDv1 Multicast Address Listeners
*
* When Multicast Address Compatibility Mode is MLDv2, a router acts
* using the MLDv2 protocol for that multicast address. When Multicast
* Address Compatibility Mode is MLDv1, a router internally translates
* the following MLDv1 messages for that multicast address to their
* MLDv2 equivalents:
*
* MLDv1 Message MLDv2 Equivalent
* -------------- -----------------
* Report IS_EX( {} )
* Done TO_IN( {} )
*/
static void amt_mldv1_report_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb);
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct amt_group_node *gnode;
union amt_addr group, host;
memcpy(&group.ip6, &mld->mld_mca, sizeof(struct in6_addr));
memcpy(&host.ip6, &ip6h->saddr, sizeof(struct in6_addr));
gnode = amt_lookup_group(tunnel, &group, &host, true);
if (!gnode) {
gnode = amt_add_group(amt, tunnel, &group, &host, true);
if (!IS_ERR(gnode)) {
gnode->filter_mode = MCAST_EXCLUDE;
if (!mod_delayed_work(amt_wq, &gnode->group_timer,
msecs_to_jiffies(amt_gmi(amt))))
dev_hold(amt->dev);
}
}
}
/* RFC 3810
* 8.3.2. In the Presence of MLDv1 Multicast Address Listeners
*
* When Multicast Address Compatibility Mode is MLDv2, a router acts
* using the MLDv2 protocol for that multicast address. When Multicast
* Address Compatibility Mode is MLDv1, a router internally translates
* the following MLDv1 messages for that multicast address to their
* MLDv2 equivalents:
*
* MLDv1 Message MLDv2 Equivalent
* -------------- -----------------
* Report IS_EX( {} )
* Done TO_IN( {} )
*/
static void amt_mldv1_leave_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb);
struct iphdr *iph = ip_hdr(skb);
struct amt_group_node *gnode;
union amt_addr group, host;
memcpy(&group.ip6, &mld->mld_mca, sizeof(struct in6_addr));
memset(&host, 0, sizeof(union amt_addr));
host.ip4 = iph->saddr;
gnode = amt_lookup_group(tunnel, &group, &host, true);
if (gnode) {
amt_del_group(amt, gnode);
return;
}
}
static void amt_mldv2_report_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct mld2_report *mld2r = (struct mld2_report *)icmp6_hdr(skb);
int len = skb_transport_offset(skb) + sizeof(*mld2r);
void *zero_grec = (void *)&mldv2_zero_grec;
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct amt_group_node *gnode;
union amt_addr group, host;
struct mld2_grec *grec;
u16 nsrcs;
int i;
for (i = 0; i < ntohs(mld2r->mld2r_ngrec); i++) {
len += sizeof(*grec);
if (!ipv6_mc_may_pull(skb, len))
break;
grec = (void *)(skb->data + len - sizeof(*grec));
nsrcs = ntohs(grec->grec_nsrcs);
len += nsrcs * sizeof(struct in6_addr);
if (!ipv6_mc_may_pull(skb, len))
break;
memset(&group, 0, sizeof(union amt_addr));
group.ip6 = grec->grec_mca;
memset(&host, 0, sizeof(union amt_addr));
host.ip6 = ip6h->saddr;
gnode = amt_lookup_group(tunnel, &group, &host, true);
if (!gnode) {
gnode = amt_add_group(amt, tunnel, &group, &host,
ETH_P_IPV6);
if (IS_ERR(gnode))
continue;
}
amt_add_srcs(amt, tunnel, gnode, grec, true);
switch (grec->grec_type) {
case MLD2_MODE_IS_INCLUDE:
amt_mcast_is_in_handler(amt, tunnel, gnode, grec,
zero_grec, true);
break;
case MLD2_MODE_IS_EXCLUDE:
amt_mcast_is_ex_handler(amt, tunnel, gnode, grec,
zero_grec, true);
break;
case MLD2_CHANGE_TO_INCLUDE:
amt_mcast_to_in_handler(amt, tunnel, gnode, grec,
zero_grec, true);
break;
case MLD2_CHANGE_TO_EXCLUDE:
amt_mcast_to_ex_handler(amt, tunnel, gnode, grec,
zero_grec, true);
break;
case MLD2_ALLOW_NEW_SOURCES:
amt_mcast_allow_handler(amt, tunnel, gnode, grec,
zero_grec, true);
break;
case MLD2_BLOCK_OLD_SOURCES:
amt_mcast_block_handler(amt, tunnel, gnode, grec,
zero_grec, true);
break;
default:
break;
}
amt_cleanup_srcs(amt, tunnel, gnode);
}
}
/* caller held tunnel->lock */
static void amt_mld_report_handler(struct amt_dev *amt, struct sk_buff *skb,
struct amt_tunnel_list *tunnel)
{
struct mld_msg *mld = (struct mld_msg *)icmp6_hdr(skb);
switch (mld->mld_type) {
case ICMPV6_MGM_REPORT:
amt_mldv1_report_handler(amt, skb, tunnel);
break;
case ICMPV6_MLD2_REPORT:
amt_mldv2_report_handler(amt, skb, tunnel);
break;
case ICMPV6_MGM_REDUCTION:
amt_mldv1_leave_handler(amt, skb, tunnel);
break;
default:
break;
}
}
#endif
static bool amt_advertisement_handler(struct amt_dev *amt, struct sk_buff *skb)
{
struct amt_header_advertisement *amta;
int hdr_size;
hdr_size = sizeof(*amta) - sizeof(struct amt_header);
if (!pskb_may_pull(skb, hdr_size))
return true;
amta = (struct amt_header_advertisement *)(udp_hdr(skb) + 1);
if (!amta->ip4)
return true;
if (amta->reserved || amta->version)
return true;
if (ipv4_is_loopback(amta->ip4) || ipv4_is_multicast(amta->ip4) ||
ipv4_is_zeronet(amta->ip4))
return true;
amt->remote_ip = amta->ip4;
netdev_dbg(amt->dev, "advertised remote ip = %pI4\n", &amt->remote_ip);
mod_delayed_work(amt_wq, &amt->req_wq, 0);
amt_update_gw_status(amt, AMT_STATUS_RECEIVED_ADVERTISEMENT, true);
return false;
}
static bool amt_multicast_data_handler(struct amt_dev *amt, struct sk_buff *skb)
{
struct amt_header_mcast_data *amtmd;
int hdr_size, len, err;
struct ethhdr *eth;
struct iphdr *iph;
amtmd = (struct amt_header_mcast_data *)(udp_hdr(skb) + 1);
if (amtmd->reserved || amtmd->version)
return true;
hdr_size = sizeof(*amtmd) + sizeof(struct udphdr);
if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_IP), false))
return true;
skb_reset_network_header(skb);
skb_push(skb, sizeof(*eth));
skb_reset_mac_header(skb);
skb_pull(skb, sizeof(*eth));
eth = eth_hdr(skb);
iph = ip_hdr(skb);
if (iph->version == 4) {
if (!ipv4_is_multicast(iph->daddr))
return true;
skb->protocol = htons(ETH_P_IP);
eth->h_proto = htons(ETH_P_IP);
ip_eth_mc_map(iph->daddr, eth->h_dest);
#if IS_ENABLED(CONFIG_IPV6)
} else if (iph->version == 6) {
struct ipv6hdr *ip6h;
ip6h = ipv6_hdr(skb);
if (!ipv6_addr_is_multicast(&ip6h->daddr))
return true;
skb->protocol = htons(ETH_P_IPV6);
eth->h_proto = htons(ETH_P_IPV6);
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
#endif
} else {
return true;
}
skb->pkt_type = PACKET_MULTICAST;
skb->ip_summed = CHECKSUM_NONE;
len = skb->len;
err = gro_cells_receive(&amt->gro_cells, skb);
if (likely(err == NET_RX_SUCCESS))
dev_sw_netstats_rx_add(amt->dev, len);
else
amt->dev->stats.rx_dropped++;
return false;
}
static bool amt_membership_query_handler(struct amt_dev *amt,
struct sk_buff *skb)
{
struct amt_header_membership_query *amtmq;
struct igmpv3_query *ihv3;
struct ethhdr *eth, *oeth;
struct iphdr *iph;
int hdr_size, len;
hdr_size = sizeof(*amtmq) - sizeof(struct amt_header);
if (!pskb_may_pull(skb, hdr_size))
return true;
amtmq = (struct amt_header_membership_query *)(udp_hdr(skb) + 1);
if (amtmq->reserved || amtmq->version)
return true;
hdr_size = sizeof(*amtmq) + sizeof(struct udphdr) - sizeof(*eth);
if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_TEB), false))
return true;
oeth = eth_hdr(skb);
skb_reset_mac_header(skb);
skb_pull(skb, sizeof(*eth));
skb_reset_network_header(skb);
eth = eth_hdr(skb);
iph = ip_hdr(skb);
if (iph->version == 4) {
if (!ipv4_is_multicast(iph->daddr))
return true;
if (!pskb_may_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS +
sizeof(*ihv3)))
return true;
ihv3 = skb_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS);
skb_reset_transport_header(skb);
skb_push(skb, sizeof(*iph) + AMT_IPHDR_OPTS);
spin_lock_bh(&amt->lock);
amt->ready4 = true;
amt->mac = amtmq->response_mac;
amt->req_cnt = 0;
amt->qi = ihv3->qqic;
spin_unlock_bh(&amt->lock);
skb->protocol = htons(ETH_P_IP);
eth->h_proto = htons(ETH_P_IP);
ip_eth_mc_map(iph->daddr, eth->h_dest);
#if IS_ENABLED(CONFIG_IPV6)
} else if (iph->version == 6) {
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct mld2_query *mld2q;
if (!ipv6_addr_is_multicast(&ip6h->daddr))
return true;
if (!pskb_may_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS +
sizeof(*mld2q)))
return true;
mld2q = skb_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS);
skb_reset_transport_header(skb);
skb_push(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS);
spin_lock_bh(&amt->lock);
amt->ready6 = true;
amt->mac = amtmq->response_mac;
amt->req_cnt = 0;
amt->qi = mld2q->mld2q_qqic;
spin_unlock_bh(&amt->lock);
skb->protocol = htons(ETH_P_IPV6);
eth->h_proto = htons(ETH_P_IPV6);
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
#endif
} else {
return true;
}
ether_addr_copy(eth->h_source, oeth->h_source);
skb->pkt_type = PACKET_MULTICAST;
skb->ip_summed = CHECKSUM_NONE;
len = skb->len;
if (__netif_rx(skb) == NET_RX_SUCCESS) {
amt_update_gw_status(amt, AMT_STATUS_RECEIVED_QUERY, true);
dev_sw_netstats_rx_add(amt->dev, len);
} else {
amt->dev->stats.rx_dropped++;
}
return false;
}
static bool amt_update_handler(struct amt_dev *amt, struct sk_buff *skb)
{
struct amt_header_membership_update *amtmu;
struct amt_tunnel_list *tunnel;
struct udphdr *udph;
struct ethhdr *eth;
struct iphdr *iph;
int len;
iph = ip_hdr(skb);
udph = udp_hdr(skb);
if (__iptunnel_pull_header(skb, sizeof(*udph), skb->protocol,
false, false))
return true;
amtmu = (struct amt_header_membership_update *)skb->data;
if (amtmu->reserved || amtmu->version)
return true;
skb_pull(skb, sizeof(*amtmu));
skb_reset_network_header(skb);
list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list) {
if (tunnel->ip4 == iph->saddr) {
if ((amtmu->nonce == tunnel->nonce &&
amtmu->response_mac == tunnel->mac)) {
mod_delayed_work(amt_wq, &tunnel->gc_wq,
msecs_to_jiffies(amt_gmi(amt))
* 3);
goto report;
} else {
netdev_dbg(amt->dev, "Invalid MAC\n");
return true;
}
}
}
return false;
report:
iph = ip_hdr(skb);
if (iph->version == 4) {
if (ip_mc_check_igmp(skb)) {
netdev_dbg(amt->dev, "Invalid IGMP\n");
return true;
}
spin_lock_bh(&tunnel->lock);
amt_igmp_report_handler(amt, skb, tunnel);
spin_unlock_bh(&tunnel->lock);
skb_push(skb, sizeof(struct ethhdr));
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
skb->protocol = htons(ETH_P_IP);
eth->h_proto = htons(ETH_P_IP);
ip_eth_mc_map(iph->daddr, eth->h_dest);
#if IS_ENABLED(CONFIG_IPV6)
} else if (iph->version == 6) {
struct ipv6hdr *ip6h = ipv6_hdr(skb);
if (ipv6_mc_check_mld(skb)) {
netdev_dbg(amt->dev, "Invalid MLD\n");
return true;
}
spin_lock_bh(&tunnel->lock);
amt_mld_report_handler(amt, skb, tunnel);
spin_unlock_bh(&tunnel->lock);
skb_push(skb, sizeof(struct ethhdr));
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
skb->protocol = htons(ETH_P_IPV6);
eth->h_proto = htons(ETH_P_IPV6);
ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
#endif
} else {
netdev_dbg(amt->dev, "Unsupported Protocol\n");
return true;
}
skb_pull(skb, sizeof(struct ethhdr));
skb->pkt_type = PACKET_MULTICAST;
skb->ip_summed = CHECKSUM_NONE;
len = skb->len;
if (__netif_rx(skb) == NET_RX_SUCCESS) {
amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_UPDATE,
true);
dev_sw_netstats_rx_add(amt->dev, len);
} else {
amt->dev->stats.rx_dropped++;
}
return false;
}
static void amt_send_advertisement(struct amt_dev *amt, __be32 nonce,
__be32 daddr, __be16 dport)
{
struct amt_header_advertisement *amta;
int hlen, tlen, offset;
struct socket *sock;
struct udphdr *udph;
struct sk_buff *skb;
struct iphdr *iph;
struct rtable *rt;
struct flowi4 fl4;
u32 len;
int err;
rcu_read_lock();
sock = rcu_dereference(amt->sock);
if (!sock)
goto out;
if (!netif_running(amt->stream_dev) || !netif_running(amt->dev))
goto out;
rt = ip_route_output_ports(amt->net, &fl4, sock->sk,
daddr, amt->local_ip,
dport, amt->relay_port,
IPPROTO_UDP, 0,
amt->stream_dev->ifindex);
if (IS_ERR(rt)) {
amt->dev->stats.tx_errors++;
goto out;
}
hlen = LL_RESERVED_SPACE(amt->dev);
tlen = amt->dev->needed_tailroom;
len = hlen + tlen + sizeof(*iph) + sizeof(*udph) + sizeof(*amta);
skb = netdev_alloc_skb_ip_align(amt->dev, len);
if (!skb) {
ip_rt_put(rt);
amt->dev->stats.tx_errors++;
goto out;
}
skb->priority = TC_PRIO_CONTROL;
skb_dst_set(skb, &rt->dst);
len = sizeof(*iph) + sizeof(*udph) + sizeof(*amta);
skb_reset_network_header(skb);
skb_put(skb, len);
amta = skb_pull(skb, sizeof(*iph) + sizeof(*udph));
amta->version = 0;
amta->type = AMT_MSG_ADVERTISEMENT;
amta->reserved = 0;
amta->nonce = nonce;
amta->ip4 = amt->local_ip;
skb_push(skb, sizeof(*udph));
skb_reset_transport_header(skb);
udph = udp_hdr(skb);
udph->source = amt->relay_port;
udph->dest = dport;
udph->len = htons(sizeof(*amta) + sizeof(*udph));
udph->check = 0;
offset = skb_transport_offset(skb);
skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
udph->check = csum_tcpudp_magic(amt->local_ip, daddr,
sizeof(*udph) + sizeof(*amta),
IPPROTO_UDP, skb->csum);
skb_push(skb, sizeof(*iph));
iph = ip_hdr(skb);
iph->version = 4;
iph->ihl = (sizeof(struct iphdr)) >> 2;
iph->tos = AMT_TOS;
iph->frag_off = 0;
iph->ttl = ip4_dst_hoplimit(&rt->dst);
iph->daddr = daddr;
iph->saddr = amt->local_ip;
iph->protocol = IPPROTO_UDP;
iph->tot_len = htons(len);
skb->ip_summed = CHECKSUM_NONE;
ip_select_ident(amt->net, skb, NULL);
ip_send_check(iph);
err = ip_local_out(amt->net, sock->sk, skb);
if (unlikely(net_xmit_eval(err)))
amt->dev->stats.tx_errors++;
out:
rcu_read_unlock();
}
static bool amt_discovery_handler(struct amt_dev *amt, struct sk_buff *skb)
{
struct amt_header_discovery *amtd;
struct udphdr *udph;
struct iphdr *iph;
if (!pskb_may_pull(skb, sizeof(*udph) + sizeof(*amtd)))
return true;
iph = ip_hdr(skb);
udph = udp_hdr(skb);
amtd = (struct amt_header_discovery *)(udp_hdr(skb) + 1);
if (amtd->reserved || amtd->version)
return true;
amt_send_advertisement(amt, amtd->nonce, iph->saddr, udph->source);
return false;
}
static bool amt_request_handler(struct amt_dev *amt, struct sk_buff *skb)
{
struct amt_header_request *amtrh;
struct amt_tunnel_list *tunnel;
unsigned long long key;
struct udphdr *udph;
struct iphdr *iph;
u64 mac;
int i;
if (!pskb_may_pull(skb, sizeof(*udph) + sizeof(*amtrh)))
return true;
iph = ip_hdr(skb);
udph = udp_hdr(skb);
amtrh = (struct amt_header_request *)(udp_hdr(skb) + 1);
if (amtrh->reserved1 || amtrh->reserved2 || amtrh->version)
return true;
list_for_each_entry_rcu(tunnel, &amt->tunnel_list, list)
if (tunnel->ip4 == iph->saddr)
goto send;
if (amt->nr_tunnels >= amt->max_tunnels) {
icmp_ndo_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0);
return true;
}
tunnel = kzalloc(sizeof(*tunnel) +
(sizeof(struct hlist_head) * amt->hash_buckets),
GFP_ATOMIC);
if (!tunnel)
return true;
tunnel->source_port = udph->source;
tunnel->ip4 = iph->saddr;
memcpy(&key, &tunnel->key, sizeof(unsigned long long));
tunnel->amt = amt;
spin_lock_init(&tunnel->lock);
for (i = 0; i < amt->hash_buckets; i++)
INIT_HLIST_HEAD(&tunnel->groups[i]);
INIT_DELAYED_WORK(&tunnel->gc_wq, amt_tunnel_expire);
spin_lock_bh(&amt->lock);
list_add_tail_rcu(&tunnel->list, &amt->tunnel_list);
tunnel->key = amt->key;
amt_update_relay_status(tunnel, AMT_STATUS_RECEIVED_REQUEST, true);
amt->nr_tunnels++;
mod_delayed_work(amt_wq, &tunnel->gc_wq,
msecs_to_jiffies(amt_gmi(amt)));
spin_unlock_bh(&amt->lock);
send:
tunnel->nonce = amtrh->nonce;
mac = siphash_3u32((__force u32)tunnel->ip4,
(__force u32)tunnel->source_port,
(__force u32)tunnel->nonce,
&tunnel->key);
tunnel->mac = mac >> 16;
if (!netif_running(amt->dev) || !netif_running(amt->stream_dev))
return true;
if (!amtrh->p)
amt_send_igmp_gq(amt, tunnel);
else
amt_send_mld_gq(amt, tunnel);
return false;
}
static int amt_rcv(struct sock *sk, struct sk_buff *skb)
{
struct amt_dev *amt;
struct iphdr *iph;
int type;
bool err;
rcu_read_lock_bh();
amt = rcu_dereference_sk_user_data(sk);
if (!amt) {
err = true;
goto out;
}
skb->dev = amt->dev;
iph = ip_hdr(skb);
type = amt_parse_type(skb);
if (type == -1) {
err = true;
goto drop;
}
if (amt->mode == AMT_MODE_GATEWAY) {
switch (type) {
case AMT_MSG_ADVERTISEMENT:
if (iph->saddr != amt->discovery_ip) {
netdev_dbg(amt->dev, "Invalid Relay IP\n");
err = true;
goto drop;
}
if (amt_advertisement_handler(amt, skb))
amt->dev->stats.rx_dropped++;
goto out;
case AMT_MSG_MULTICAST_DATA:
if (iph->saddr != amt->remote_ip) {
netdev_dbg(amt->dev, "Invalid Relay IP\n");
err = true;
goto drop;
}
err = amt_multicast_data_handler(amt, skb);
if (err)
goto drop;
else
goto out;
case AMT_MSG_MEMBERSHIP_QUERY:
if (iph->saddr != amt->remote_ip) {
netdev_dbg(amt->dev, "Invalid Relay IP\n");
err = true;
goto drop;
}
err = amt_membership_query_handler(amt, skb);
if (err)
goto drop;
else
goto out;
default:
err = true;
netdev_dbg(amt->dev, "Invalid type of Gateway\n");
break;
}
} else {
switch (type) {
case AMT_MSG_DISCOVERY:
err = amt_discovery_handler(amt, skb);
break;
case AMT_MSG_REQUEST:
err = amt_request_handler(amt, skb);
break;
case AMT_MSG_MEMBERSHIP_UPDATE:
err = amt_update_handler(amt, skb);
if (err)
goto drop;
else
goto out;
default:
err = true;
netdev_dbg(amt->dev, "Invalid type of relay\n");
break;
}
}
drop:
if (err) {
amt->dev->stats.rx_dropped++;
kfree_skb(skb);
} else {
consume_skb(skb);
}
out:
rcu_read_unlock_bh();
return 0;
}
static int amt_err_lookup(struct sock *sk, struct sk_buff *skb)
{
struct amt_dev *amt;
int type;
rcu_read_lock_bh();
amt = rcu_dereference_sk_user_data(sk);
if (!amt)
goto out;
if (amt->mode != AMT_MODE_GATEWAY)
goto drop;
type = amt_parse_type(skb);
if (type == -1)
goto drop;
netdev_dbg(amt->dev, "Received IGMP Unreachable of %s\n",
type_str[type]);
switch (type) {
case AMT_MSG_DISCOVERY:
break;
case AMT_MSG_REQUEST:
case AMT_MSG_MEMBERSHIP_UPDATE:
if (amt->status >= AMT_STATUS_RECEIVED_ADVERTISEMENT)
mod_delayed_work(amt_wq, &amt->req_wq, 0);
break;
default:
goto drop;
}
out:
rcu_read_unlock_bh();
return 0;
drop:
rcu_read_unlock_bh();
amt->dev->stats.rx_dropped++;
return 0;
}
static struct socket *amt_create_sock(struct net *net, __be16 port)
{
struct udp_port_cfg udp_conf;
struct socket *sock;
int err;
memset(&udp_conf, 0, sizeof(udp_conf));
udp_conf.family = AF_INET;
udp_conf.local_ip.s_addr = htonl(INADDR_ANY);
udp_conf.local_udp_port = port;
err = udp_sock_create(net, &udp_conf, &sock);
if (err < 0)
return ERR_PTR(err);
return sock;
}
static int amt_socket_create(struct amt_dev *amt)
{
struct udp_tunnel_sock_cfg tunnel_cfg;
struct socket *sock;
sock = amt_create_sock(amt->net, amt->relay_port);
if (IS_ERR(sock))
return PTR_ERR(sock);
/* Mark socket as an encapsulation socket */
memset(&tunnel_cfg, 0, sizeof(tunnel_cfg));
tunnel_cfg.sk_user_data = amt;
tunnel_cfg.encap_type = 1;
tunnel_cfg.encap_rcv = amt_rcv;
tunnel_cfg.encap_err_lookup = amt_err_lookup;
tunnel_cfg.encap_destroy = NULL;
setup_udp_tunnel_sock(amt->net, sock, &tunnel_cfg);
rcu_assign_pointer(amt->sock, sock);
return 0;
}
static int amt_dev_open(struct net_device *dev)
{
struct amt_dev *amt = netdev_priv(dev);
int err;
amt->ready4 = false;
amt->ready6 = false;
err = amt_socket_create(amt);
if (err)
return err;
amt->req_cnt = 0;
amt->remote_ip = 0;
get_random_bytes(&amt->key, sizeof(siphash_key_t));
amt->status = AMT_STATUS_INIT;
if (amt->mode == AMT_MODE_GATEWAY) {
mod_delayed_work(amt_wq, &amt->discovery_wq, 0);
mod_delayed_work(amt_wq, &amt->req_wq, 0);
} else if (amt->mode == AMT_MODE_RELAY) {
mod_delayed_work(amt_wq, &amt->secret_wq,
msecs_to_jiffies(AMT_SECRET_TIMEOUT));
}
return err;
}
static int amt_dev_stop(struct net_device *dev)
{
struct amt_dev *amt = netdev_priv(dev);
struct amt_tunnel_list *tunnel, *tmp;
struct socket *sock;
cancel_delayed_work_sync(&amt->req_wq);
cancel_delayed_work_sync(&amt->discovery_wq);
cancel_delayed_work_sync(&amt->secret_wq);
/* shutdown */
sock = rtnl_dereference(amt->sock);
RCU_INIT_POINTER(amt->sock, NULL);
synchronize_net();
if (sock)
udp_tunnel_sock_release(sock);
amt->ready4 = false;
amt->ready6 = false;
amt->req_cnt = 0;
amt->remote_ip = 0;
list_for_each_entry_safe(tunnel, tmp, &amt->tunnel_list, list) {
list_del_rcu(&tunnel->list);
amt->nr_tunnels--;
cancel_delayed_work_sync(&tunnel->gc_wq);
amt_clear_groups(tunnel);
kfree_rcu(tunnel, rcu);
}
return 0;
}
static const struct device_type amt_type = {
.name = "amt",
};
static int amt_dev_init(struct net_device *dev)
{
struct amt_dev *amt = netdev_priv(dev);
int err;
amt->dev = dev;
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
if (!dev->tstats)
return -ENOMEM;
err = gro_cells_init(&amt->gro_cells, dev);
if (err) {
free_percpu(dev->tstats);
return err;
}
return 0;
}
static void amt_dev_uninit(struct net_device *dev)
{
struct amt_dev *amt = netdev_priv(dev);
gro_cells_destroy(&amt->gro_cells);
free_percpu(dev->tstats);
}
static const struct net_device_ops amt_netdev_ops = {
.ndo_init = amt_dev_init,
.ndo_uninit = amt_dev_uninit,
.ndo_open = amt_dev_open,
.ndo_stop = amt_dev_stop,
.ndo_start_xmit = amt_dev_xmit,
.ndo_get_stats64 = dev_get_tstats64,
};
static void amt_link_setup(struct net_device *dev)
{
dev->netdev_ops = &amt_netdev_ops;
dev->needs_free_netdev = true;
SET_NETDEV_DEVTYPE(dev, &amt_type);
dev->min_mtu = ETH_MIN_MTU;
dev->max_mtu = ETH_MAX_MTU;
dev->type = ARPHRD_NONE;
dev->flags = IFF_POINTOPOINT | IFF_NOARP | IFF_MULTICAST;
dev->hard_header_len = 0;
dev->addr_len = 0;
dev->priv_flags |= IFF_NO_QUEUE;
dev->features |= NETIF_F_LLTX;
dev->features |= NETIF_F_GSO_SOFTWARE;
dev->features |= NETIF_F_NETNS_LOCAL;
dev->hw_features |= NETIF_F_SG | NETIF_F_HW_CSUM;
dev->hw_features |= NETIF_F_FRAGLIST | NETIF_F_RXCSUM;
dev->hw_features |= NETIF_F_GSO_SOFTWARE;
eth_hw_addr_random(dev);
eth_zero_addr(dev->broadcast);
ether_setup(dev);
}
static const struct nla_policy amt_policy[IFLA_AMT_MAX + 1] = {
[IFLA_AMT_MODE] = { .type = NLA_U32 },
[IFLA_AMT_RELAY_PORT] = { .type = NLA_U16 },
[IFLA_AMT_GATEWAY_PORT] = { .type = NLA_U16 },
[IFLA_AMT_LINK] = { .type = NLA_U32 },
[IFLA_AMT_LOCAL_IP] = { .len = sizeof_field(struct iphdr, daddr) },
[IFLA_AMT_REMOTE_IP] = { .len = sizeof_field(struct iphdr, daddr) },
[IFLA_AMT_DISCOVERY_IP] = { .len = sizeof_field(struct iphdr, daddr) },
[IFLA_AMT_MAX_TUNNELS] = { .type = NLA_U32 },
};
static int amt_validate(struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
if (!data)
return -EINVAL;
if (!data[IFLA_AMT_LINK]) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LINK],
"Link attribute is required");
return -EINVAL;
}
if (!data[IFLA_AMT_MODE]) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE],
"Mode attribute is required");
return -EINVAL;
}
if (nla_get_u32(data[IFLA_AMT_MODE]) > AMT_MODE_MAX) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_MODE],
"Mode attribute is not valid");
return -EINVAL;
}
if (!data[IFLA_AMT_LOCAL_IP]) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_DISCOVERY_IP],
"Local attribute is required");
return -EINVAL;
}
if (!data[IFLA_AMT_DISCOVERY_IP] &&
nla_get_u32(data[IFLA_AMT_MODE]) == AMT_MODE_GATEWAY) {
NL_SET_ERR_MSG_ATTR(extack, data[IFLA_AMT_LOCAL_IP],
"Discovery attribute is required");
return -EINVAL;
}
return 0;
}
static int amt_newlink(struct net *net, struct net_device *dev,
struct nlattr *tb[], struct nlattr *data[],
struct netlink_ext_ack *extack)
{
struct amt_dev *amt = netdev_priv(dev);
int err = -EINVAL;
amt->net = net;
amt->mode = nla_get_u32(data[IFLA_AMT_MODE]);
if (data[IFLA_AMT_MAX_TUNNELS] &&
nla_get_u32(data[IFLA_AMT_MAX_TUNNELS]))
amt->max_tunnels = nla_get_u32(data[IFLA_AMT_MAX_TUNNELS]);
else
amt->max_tunnels = AMT_MAX_TUNNELS;
spin_lock_init(&amt->lock);
amt->max_groups = AMT_MAX_GROUP;
amt->max_sources = AMT_MAX_SOURCE;
amt->hash_buckets = AMT_HSIZE;
amt->nr_tunnels = 0;
get_random_bytes(&amt->hash_seed, sizeof(amt->hash_seed));
amt->stream_dev = dev_get_by_index(net,
nla_get_u32(data[IFLA_AMT_LINK]));
if (!amt->stream_dev) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK],
"Can't find stream device");
return -ENODEV;
}
if (amt->stream_dev->type != ARPHRD_ETHER) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LINK],
"Invalid stream device type");
goto err;
}
amt->local_ip = nla_get_in_addr(data[IFLA_AMT_LOCAL_IP]);
if (ipv4_is_loopback(amt->local_ip) ||
ipv4_is_zeronet(amt->local_ip) ||
ipv4_is_multicast(amt->local_ip)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_LOCAL_IP],
"Invalid Local address");
goto err;
}
if (data[IFLA_AMT_RELAY_PORT])
amt->relay_port = nla_get_be16(data[IFLA_AMT_RELAY_PORT]);
else
amt->relay_port = htons(IANA_AMT_UDP_PORT);
if (data[IFLA_AMT_GATEWAY_PORT])
amt->gw_port = nla_get_be16(data[IFLA_AMT_GATEWAY_PORT]);
else
amt->gw_port = htons(IANA_AMT_UDP_PORT);
if (!amt->relay_port) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
"relay port must not be 0");
goto err;
}
if (amt->mode == AMT_MODE_RELAY) {
amt->qrv = amt->net->ipv4.sysctl_igmp_qrv;
amt->qri = 10;
dev->needed_headroom = amt->stream_dev->needed_headroom +
AMT_RELAY_HLEN;
dev->mtu = amt->stream_dev->mtu - AMT_RELAY_HLEN;
dev->max_mtu = dev->mtu;
dev->min_mtu = ETH_MIN_MTU + AMT_RELAY_HLEN;
} else {
if (!data[IFLA_AMT_DISCOVERY_IP]) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
"discovery must be set in gateway mode");
goto err;
}
if (!amt->gw_port) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
"gateway port must not be 0");
goto err;
}
amt->remote_ip = 0;
amt->discovery_ip = nla_get_in_addr(data[IFLA_AMT_DISCOVERY_IP]);
if (ipv4_is_loopback(amt->discovery_ip) ||
ipv4_is_zeronet(amt->discovery_ip) ||
ipv4_is_multicast(amt->discovery_ip)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IFLA_AMT_DISCOVERY_IP],
"discovery must be unicast");
goto err;
}
dev->needed_headroom = amt->stream_dev->needed_headroom +
AMT_GW_HLEN;
dev->mtu = amt->stream_dev->mtu - AMT_GW_HLEN;
dev->max_mtu = dev->mtu;
dev->min_mtu = ETH_MIN_MTU + AMT_GW_HLEN;
}
amt->qi = AMT_INIT_QUERY_INTERVAL;
err = register_netdevice(dev);
if (err < 0) {
netdev_dbg(dev, "failed to register new netdev %d\n", err);
goto err;
}
err = netdev_upper_dev_link(amt->stream_dev, dev, extack);
if (err < 0) {
unregister_netdevice(dev);
goto err;
}
INIT_DELAYED_WORK(&amt->discovery_wq, amt_discovery_work);
INIT_DELAYED_WORK(&amt->req_wq, amt_req_work);
INIT_DELAYED_WORK(&amt->secret_wq, amt_secret_work);
INIT_LIST_HEAD(&amt->tunnel_list);
return 0;
err:
dev_put(amt->stream_dev);
return err;
}
static void amt_dellink(struct net_device *dev, struct list_head *head)
{
struct amt_dev *amt = netdev_priv(dev);
unregister_netdevice_queue(dev, head);
netdev_upper_dev_unlink(amt->stream_dev, dev);
dev_put(amt->stream_dev);
}
static size_t amt_get_size(const struct net_device *dev)
{
return nla_total_size(sizeof(__u32)) + /* IFLA_AMT_MODE */
nla_total_size(sizeof(__u16)) + /* IFLA_AMT_RELAY_PORT */
nla_total_size(sizeof(__u16)) + /* IFLA_AMT_GATEWAY_PORT */
nla_total_size(sizeof(__u32)) + /* IFLA_AMT_LINK */
nla_total_size(sizeof(__u32)) + /* IFLA_MAX_TUNNELS */
nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_DISCOVERY_IP */
nla_total_size(sizeof(struct iphdr)) + /* IFLA_AMT_REMOTE_IP */
nla_total_size(sizeof(struct iphdr)); /* IFLA_AMT_LOCAL_IP */
}
static int amt_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct amt_dev *amt = netdev_priv(dev);
if (nla_put_u32(skb, IFLA_AMT_MODE, amt->mode))
goto nla_put_failure;
if (nla_put_be16(skb, IFLA_AMT_RELAY_PORT, amt->relay_port))
goto nla_put_failure;
if (nla_put_be16(skb, IFLA_AMT_GATEWAY_PORT, amt->gw_port))
goto nla_put_failure;
if (nla_put_u32(skb, IFLA_AMT_LINK, amt->stream_dev->ifindex))
goto nla_put_failure;
if (nla_put_in_addr(skb, IFLA_AMT_LOCAL_IP, amt->local_ip))
goto nla_put_failure;
if (nla_put_in_addr(skb, IFLA_AMT_DISCOVERY_IP, amt->discovery_ip))
goto nla_put_failure;
if (amt->remote_ip)
if (nla_put_in_addr(skb, IFLA_AMT_REMOTE_IP, amt->remote_ip))
goto nla_put_failure;
if (nla_put_u32(skb, IFLA_AMT_MAX_TUNNELS, amt->max_tunnels))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops amt_link_ops __read_mostly = {
.kind = "amt",
.maxtype = IFLA_AMT_MAX,
.policy = amt_policy,
.priv_size = sizeof(struct amt_dev),
.setup = amt_link_setup,
.validate = amt_validate,
.newlink = amt_newlink,
.dellink = amt_dellink,
.get_size = amt_get_size,
.fill_info = amt_fill_info,
};
static struct net_device *amt_lookup_upper_dev(struct net_device *dev)
{
struct net_device *upper_dev;
struct amt_dev *amt;
for_each_netdev(dev_net(dev), upper_dev) {
if (netif_is_amt(upper_dev)) {
amt = netdev_priv(upper_dev);
if (amt->stream_dev == dev)
return upper_dev;
}
}
return NULL;
}
static int amt_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
{
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
struct net_device *upper_dev;
struct amt_dev *amt;
LIST_HEAD(list);
int new_mtu;
upper_dev = amt_lookup_upper_dev(dev);
if (!upper_dev)
return NOTIFY_DONE;
amt = netdev_priv(upper_dev);
switch (event) {
case NETDEV_UNREGISTER:
amt_dellink(amt->dev, &list);
unregister_netdevice_many(&list);
break;
case NETDEV_CHANGEMTU:
if (amt->mode == AMT_MODE_RELAY)
new_mtu = dev->mtu - AMT_RELAY_HLEN;
else
new_mtu = dev->mtu - AMT_GW_HLEN;
dev_set_mtu(amt->dev, new_mtu);
break;
}
return NOTIFY_DONE;
}
static struct notifier_block amt_notifier_block __read_mostly = {
.notifier_call = amt_device_event,
};
static int __init amt_init(void)
{
int err;
err = register_netdevice_notifier(&amt_notifier_block);
if (err < 0)
goto err;
err = rtnl_link_register(&amt_link_ops);
if (err < 0)
goto unregister_notifier;
amt_wq = alloc_workqueue("amt", WQ_UNBOUND, 1);
if (!amt_wq) {
err = -ENOMEM;
goto rtnl_unregister;
}
spin_lock_init(&source_gc_lock);
spin_lock_bh(&source_gc_lock);
INIT_DELAYED_WORK(&source_gc_wq, amt_source_gc_work);
mod_delayed_work(amt_wq, &source_gc_wq,
msecs_to_jiffies(AMT_GC_INTERVAL));
spin_unlock_bh(&source_gc_lock);
return 0;
rtnl_unregister:
rtnl_link_unregister(&amt_link_ops);
unregister_notifier:
unregister_netdevice_notifier(&amt_notifier_block);
err:
pr_err("error loading AMT module loaded\n");
return err;
}
late_initcall(amt_init);
static void __exit amt_fini(void)
{
rtnl_link_unregister(&amt_link_ops);
unregister_netdevice_notifier(&amt_notifier_block);
cancel_delayed_work_sync(&source_gc_wq);
__amt_source_gc_work();
destroy_workqueue(amt_wq);
}
module_exit(amt_fini);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Taehee Yoo <ap420073@gmail.com>");
MODULE_ALIAS_RTNL_LINK("amt");
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