Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 31c82a2d authored by Jon Maloy's avatar Jon Maloy Committed by David S. Miller
Browse files

tipc: add second source address to recvmsg()/recvfrom() 



With group communication, it becomes important for a message receiver to
identify not only from which socket (identfied by a node:port tuple) the
message was sent, but also the logical identity (type:instance) of the
sending member.

We fix this by adding a second instance of struct sockaddr_tipc to the
source address area when a message is read. The extra address struct
is filled in with data found in the received message header (type,) and
in the local member representation struct (instance.)

Signed-off-by: default avatarJon Maloy <jon.maloy@ericsson.com>
Acked-by: default avatarYing Xue <ying.xue@windriver.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 75da2163

net/tipc/group.c

+3 −0
Original line number Diff line number Diff line
@@ -61,6 +61,7 @@ struct tipc_member { 
	struct list_head list;

	u32 node;

	u32 port;

	u32 instance;

	enum mbr_state state;

	u16 bc_rcv_nxt;

};
@@ -282,6 +283,7 @@ void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq, 
	if (!tipc_group_is_receiver(m))

		goto drop;



	TIPC_SKB_CB(skb)->orig_member = m->instance;

	__skb_queue_tail(inputq, skb);



	m->bc_rcv_nxt = msg_grp_bc_seqno(hdr) + 1;
@@ -388,6 +390,7 @@ void tipc_group_member_evt(struct tipc_group *grp, 
			m->state = MBR_PUBLISHED;

		else

			m->state = MBR_JOINED;

		m->instance = evt->found_lower;

		tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);

	} else if (evt->event == TIPC_WITHDRAWN) {

		if (!m)

net/tipc/msg.h

+1 −0
Original line number Diff line number Diff line
@@ -100,6 +100,7 @@ struct plist; 


struct tipc_skb_cb {

	u32 bytes_read;

	u32 orig_member;

	struct sk_buff *tail;

	bool validated;

	u16 chain_imp;

net/tipc/socket.c

+35 −18
Original line number Diff line number Diff line
@@ -62,6 +62,11 @@ enum { 
	TIPC_CONNECTING = TCP_SYN_SENT,

};



struct sockaddr_pair {

	struct sockaddr_tipc sock;

	struct sockaddr_tipc member;

};



/**

 * struct tipc_sock - TIPC socket structure

 * @sk: socket - interacts with 'port' and with user via the socket API
@@ -1222,26 +1227,38 @@ static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port, 
}



/**

 * set_orig_addr - capture sender's address for received message

 * tipc_sk_set_orig_addr - capture sender's address for received message

 * @m: descriptor for message info

 * @msg: received message header

 * @hdr: received message header

 *

 * Note: Address is not captured if not requested by receiver.

 */

static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)

static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)

{

	DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);

	DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);

	struct tipc_msg *hdr = buf_msg(skb);



	if (addr) {

		addr->family = AF_TIPC;

		addr->addrtype = TIPC_ADDR_ID;

		memset(&addr->addr, 0, sizeof(addr->addr));

		addr->addr.id.ref = msg_origport(msg);

		addr->addr.id.node = msg_orignode(msg);

		addr->addr.name.domain = 0;	/* could leave uninitialized */

		addr->scope = 0;		/* could leave uninitialized */

	if (!srcaddr)

		return;



	srcaddr->sock.family = AF_TIPC;

	srcaddr->sock.addrtype = TIPC_ADDR_ID;

	srcaddr->sock.addr.id.ref = msg_origport(hdr);

	srcaddr->sock.addr.id.node = msg_orignode(hdr);

	srcaddr->sock.addr.name.domain = 0;

	srcaddr->sock.scope = 0;

	m->msg_namelen = sizeof(struct sockaddr_tipc);

	}



	if (!msg_in_group(hdr))

		return;



	/* Group message users may also want to know sending member's id */

	srcaddr->member.family = AF_TIPC;

	srcaddr->member.addrtype = TIPC_ADDR_NAME;

	srcaddr->member.addr.name.name.type = msg_nametype(hdr);

	srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;

	srcaddr->member.addr.name.domain = 0;

	m->msg_namelen = sizeof(*srcaddr);

}



/**
@@ -1432,7 +1449,7 @@ static int tipc_recvmsg(struct socket *sock, struct msghdr *m, 
	} while (1);



	/* Collect msg meta data, including error code and rejected data */

	set_orig_addr(m, hdr);

	tipc_sk_set_orig_addr(m, skb);

	rc = tipc_sk_anc_data_recv(m, hdr, tsk);

	if (unlikely(rc))

		goto exit;
@@ -1526,7 +1543,7 @@ static int tipc_recvstream(struct socket *sock, struct msghdr *m, 


		/* Collect msg meta data, incl. error code and rejected data */

		if (!copied) {

			set_orig_addr(m, hdr);

			tipc_sk_set_orig_addr(m, skb);

			rc = tipc_sk_anc_data_recv(m, hdr, tsk);

			if (rc)

				break;