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amt: add mld report message handler 

In the previous patch, igmp report handler was added.
That handler can be used for mld too.
So, it uses that common code to parse mld report message.

Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Taehee Yoo 2021-10-31 16:00:05 +00:00 committed by David S. Miller
parent bc54e49c14
commit b75f7095d4
2 changed files with 441 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

447
drivers/net/amt.c
View File

@ -29,16 +29,14 @@
#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 struct igmpv3_grec igmpv3_zero_grec;
static HLIST_HEAD(source_gc_list);
/* Lock for source_gc_list */
static spinlock_t source_gc_lock;
static struct delayed_work source_gc_wq;
static char *status_str[] = {
"AMT_STATUS_INIT",
"AMT_STATUS_SENT_DISCOVERY",
@ -72,6 +70,14 @@ static char *action_str[] = {
"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) >
@ -226,6 +232,13 @@ static void amt_destroy_source(struct amt_source_node *snode)
"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);
@ -251,6 +264,11 @@ static void amt_del_group(struct amt_dev *amt, struct amt_group_node *gnode)
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);
@ -334,6 +352,13 @@ static void amt_act_src(struct amt_tunnel_list *tunnel,
&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,
@ -472,6 +497,12 @@ static struct amt_group_node *amt_add_group(struct amt_dev *amt,
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;
}
@ -779,6 +810,96 @@ static void amt_send_igmp_gq(struct amt_dev *amt,
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),
@ -1023,6 +1144,10 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *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;
@ -1054,6 +1179,31 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev)
}
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;
@ -1093,12 +1243,19 @@ static netdev_tx_t amt_dev_xmit(struct sk_buff *skb, struct net_device *dev)
hash = amt_group_hash(tunnel, &group);
hlist_for_each_entry_rcu(gnode, &tunnel->groups[hash],
node) {
if (!v6)
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:;
found:
amt_send_multicast_data(amt, skb, tunnel, v6);
}
}
@ -1188,6 +1345,13 @@ static void amt_cleanup_srcs(struct amt_dev *amt,
"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
}
}
}
@ -1198,6 +1362,9 @@ static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel,
{
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;
@ -1207,13 +1374,23 @@ static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel,
igmp_grec = (struct igmpv3_grec *)grec;
nsrcs = ntohs(igmp_grec->grec_nsrcs);
} else {
return;
#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;
@ -1229,6 +1406,13 @@ static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel,
"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
}
}
}
@ -1263,6 +1447,9 @@ static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
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;
@ -1272,7 +1459,12 @@ static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
igmp_grec = (struct igmpv3_grec *)grec;
nsrcs = ntohs(igmp_grec->grec_nsrcs);
} else {
return;
#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));
@ -1282,6 +1474,11 @@ static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
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;
@ -1300,6 +1497,11 @@ static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
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;
@ -1316,6 +1518,12 @@ static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
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;
@ -1331,6 +1539,11 @@ out_sub:;
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) {
@ -1838,6 +2051,169 @@ static void amt_igmp_report_handler(struct amt_dev *amt, struct sk_buff *skb,
}
}
#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;
@ -1893,6 +2269,17 @@ static bool amt_multicast_data_handler(struct amt_dev *amt, struct sk_buff *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;
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;
}
@ -1955,6 +2342,30 @@ static bool amt_membership_query_handler(struct amt_dev *amt,
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;
}
@ -2031,6 +2442,26 @@ report:
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;
@ -2230,6 +2661,8 @@ send:
if (!amtrh->p)
amt_send_igmp_gq(amt, tunnel);
else
amt_send_mld_gq(amt, tunnel);
return false;
}

1
include/net/amt.h
View File

@ -349,6 +349,7 @@ struct amt_dev {
#define AMT_TOS 0xc0
#define AMT_IPHDR_OPTS 4
#define AMT_IP6HDR_OPTS 8
#define AMT_GC_INTERVAL (30 * 1000)
#define AMT_MAX_GROUP 32
#define AMT_MAX_SOURCE 128