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amt: add multicast(IGMP) report message handler 

amt 'Relay' interface manages multicast groups(igmp/mld) and sources.
In order to manage, it should have the function to parse igmp/mld
report messages. So, this adds the logic for parsing igmp report messages
and saves them on their own data structure.

   struct amt_group_node means one group(igmp/mld).
   struct amt_source_node means one source.

The same source can't exist in the same group.
The same group can exist in the same tunnel because it manages
the host address too.

The group information is used when forwarding multicast data.
If there are no groups in the specific tunnel, Relay doesn't forward it.

Although Relay manages sources, it doesn't support the source filtering
feature. Because the reason to manage sources is just that in order
to manage group more correctly.

In the next patch, MLD part will be added.

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 16:00:04 +00:00 committed by David S. Miller
parent cbc21dc1cf
commit bc54e49c14
2 changed files with 1234 additions and 2 deletions
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1132
drivers/net/amt.c
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File diff suppressed because it is too large Load Diff

104
include/net/amt.h
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@ -21,6 +21,46 @@ enum amt_msg_type {
#define AMT_MSG_MAX (__AMT_MSG_MAX - 1)
enum amt_ops {
/* A*B */
AMT_OPS_INT,
/* A+B */
AMT_OPS_UNI,
/* A-B */
AMT_OPS_SUB,
/* B-A */
AMT_OPS_SUB_REV,
__AMT_OPS_MAX,
};
#define AMT_OPS_MAX (__AMT_OPS_MAX - 1)
enum amt_filter {
AMT_FILTER_FWD,
AMT_FILTER_D_FWD,
AMT_FILTER_FWD_NEW,
AMT_FILTER_D_FWD_NEW,
AMT_FILTER_ALL,
AMT_FILTER_NONE_NEW,
AMT_FILTER_BOTH,
AMT_FILTER_BOTH_NEW,
__AMT_FILTER_MAX,
};
#define AMT_FILTER_MAX (__AMT_FILTER_MAX - 1)
enum amt_act {
AMT_ACT_GMI,
AMT_ACT_GMI_ZERO,
AMT_ACT_GT,
AMT_ACT_STATUS_FWD_NEW,
AMT_ACT_STATUS_D_FWD_NEW,
AMT_ACT_STATUS_NONE_NEW,
__AMT_ACT_MAX,
};
#define AMT_ACT_MAX (__AMT_ACT_MAX - 1)
enum amt_status {
AMT_STATUS_INIT,
AMT_STATUS_SENT_DISCOVERY,
@ -152,6 +192,17 @@ struct amt_header_mcast_data {
#endif
} __packed;
struct amt_headers {
union {
struct amt_header_discovery discovery;
struct amt_header_advertisement advertisement;
struct amt_header_request request;
struct amt_header_membership_query query;
struct amt_header_membership_update update;
struct amt_header_mcast_data data;
};
} __packed;
struct amt_gw_headers {
union {
struct amt_header_discovery discovery;
@ -191,6 +242,56 @@ struct amt_tunnel_list {
struct hlist_head groups[];
};
union amt_addr {
__be32 ip4;
#if IS_ENABLED(CONFIG_IPV6)
struct in6_addr ip6;
#endif
};
/* RFC 3810
*
* When the router is in EXCLUDE mode, the router state is represented
* by the notation EXCLUDE (X,Y), where X is called the "Requested List"
* and Y is called the "Exclude List". All sources, except those from
* the Exclude List, will be forwarded by the router
*/
enum amt_source_status {
AMT_SOURCE_STATUS_NONE,
/* Node of Requested List */
AMT_SOURCE_STATUS_FWD,
/* Node of Exclude List */
AMT_SOURCE_STATUS_D_FWD,
};
/* protected by gnode->lock */
struct amt_source_node {
struct hlist_node node;
struct amt_group_node *gnode;
struct delayed_work source_timer;
union amt_addr source_addr;
enum amt_source_status status;
#define AMT_SOURCE_OLD 0
#define AMT_SOURCE_NEW 1
u8 flags;
struct rcu_head rcu;
};
/* Protected by amt_tunnel_list->lock */
struct amt_group_node {
struct amt_dev *amt;
union amt_addr group_addr;
union amt_addr host_addr;
bool v6;
u8 filter_mode;
u32 nr_sources;
struct amt_tunnel_list *tunnel_list;
struct hlist_node node;
struct delayed_work group_timer;
struct rcu_head rcu;
struct hlist_head sources[];
};
struct amt_dev {
struct net_device *dev;
struct net_device *stream_dev;
@ -246,8 +347,9 @@ struct amt_dev {
reserved:16;
};
#define AMT_TOS 0xc0
#define AMT_TOS 0xc0
#define AMT_IPHDR_OPTS 4
#define AMT_GC_INTERVAL (30 * 1000)
#define AMT_MAX_GROUP 32
#define AMT_MAX_SOURCE 128
#define AMT_HSIZE_SHIFT 8