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

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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: Jon Maloy <jon.maloy@ericsson.com>
Acked-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jon Maloy
2017-10-13 11:04:24 +02:00
committed by David S. Miller
parent 75da2163db
commit 31c82a2d9d
3 changed files with 37 additions and 16 deletions
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49
net/tipc/socket.c
View File

@@ -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 */
m->msg_namelen = sizeof(struct sockaddr_tipc);
}
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;