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synced 2024-08-25 02:09:42 +00:00
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: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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parent
75da2163db
commit
31c82a2d9d
3 changed files with 37 additions and 16 deletions
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@ -61,6 +61,7 @@ struct tipc_member {
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struct list_head list;
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u32 node;
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u32 port;
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u32 instance;
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enum mbr_state state;
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u16 bc_rcv_nxt;
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};
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@ -282,6 +283,7 @@ void tipc_group_filter_msg(struct tipc_group *grp, struct sk_buff_head *inputq,
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if (!tipc_group_is_receiver(m))
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goto drop;
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TIPC_SKB_CB(skb)->orig_member = m->instance;
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__skb_queue_tail(inputq, skb);
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m->bc_rcv_nxt = msg_grp_bc_seqno(hdr) + 1;
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@ -388,6 +390,7 @@ void tipc_group_member_evt(struct tipc_group *grp,
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m->state = MBR_PUBLISHED;
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else
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m->state = MBR_JOINED;
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m->instance = evt->found_lower;
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tipc_group_proto_xmit(grp, m, GRP_JOIN_MSG, xmitq);
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} else if (evt->event == TIPC_WITHDRAWN) {
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if (!m)
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@ -100,6 +100,7 @@ struct plist;
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struct tipc_skb_cb {
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u32 bytes_read;
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u32 orig_member;
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struct sk_buff *tail;
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bool validated;
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u16 chain_imp;
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@ -62,6 +62,11 @@ enum {
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TIPC_CONNECTING = TCP_SYN_SENT,
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};
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struct sockaddr_pair {
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struct sockaddr_tipc sock;
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struct sockaddr_tipc member;
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};
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/**
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* struct tipc_sock - TIPC socket structure
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* @sk: socket - interacts with 'port' and with user via the socket API
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@ -1222,26 +1227,38 @@ static void tipc_sk_finish_conn(struct tipc_sock *tsk, u32 peer_port,
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}
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/**
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* set_orig_addr - capture sender's address for received message
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* tipc_sk_set_orig_addr - capture sender's address for received message
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* @m: descriptor for message info
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* @msg: received message header
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* @hdr: received message header
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*
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* Note: Address is not captured if not requested by receiver.
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*/
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static void set_orig_addr(struct msghdr *m, struct tipc_msg *msg)
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static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
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{
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DECLARE_SOCKADDR(struct sockaddr_tipc *, addr, m->msg_name);
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DECLARE_SOCKADDR(struct sockaddr_pair *, srcaddr, m->msg_name);
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struct tipc_msg *hdr = buf_msg(skb);
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if (addr) {
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addr->family = AF_TIPC;
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addr->addrtype = TIPC_ADDR_ID;
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memset(&addr->addr, 0, sizeof(addr->addr));
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addr->addr.id.ref = msg_origport(msg);
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addr->addr.id.node = msg_orignode(msg);
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addr->addr.name.domain = 0; /* could leave uninitialized */
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addr->scope = 0; /* could leave uninitialized */
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m->msg_namelen = sizeof(struct sockaddr_tipc);
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}
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if (!srcaddr)
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return;
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srcaddr->sock.family = AF_TIPC;
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srcaddr->sock.addrtype = TIPC_ADDR_ID;
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srcaddr->sock.addr.id.ref = msg_origport(hdr);
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srcaddr->sock.addr.id.node = msg_orignode(hdr);
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srcaddr->sock.addr.name.domain = 0;
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srcaddr->sock.scope = 0;
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m->msg_namelen = sizeof(struct sockaddr_tipc);
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if (!msg_in_group(hdr))
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return;
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/* Group message users may also want to know sending member's id */
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srcaddr->member.family = AF_TIPC;
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srcaddr->member.addrtype = TIPC_ADDR_NAME;
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srcaddr->member.addr.name.name.type = msg_nametype(hdr);
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srcaddr->member.addr.name.name.instance = TIPC_SKB_CB(skb)->orig_member;
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srcaddr->member.addr.name.domain = 0;
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m->msg_namelen = sizeof(*srcaddr);
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}
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/**
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@ -1432,7 +1449,7 @@ static int tipc_recvmsg(struct socket *sock, struct msghdr *m,
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} while (1);
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/* Collect msg meta data, including error code and rejected data */
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set_orig_addr(m, hdr);
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tipc_sk_set_orig_addr(m, skb);
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rc = tipc_sk_anc_data_recv(m, hdr, tsk);
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if (unlikely(rc))
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goto exit;
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@ -1526,7 +1543,7 @@ static int tipc_recvstream(struct socket *sock, struct msghdr *m,
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/* Collect msg meta data, incl. error code and rejected data */
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if (!copied) {
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set_orig_addr(m, hdr);
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tipc_sk_set_orig_addr(m, skb);
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rc = tipc_sk_anc_data_recv(m, hdr, tsk);
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if (rc)
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break;
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