Ejemplo n.º 1
0
/**
 * tipc_disc_rcv - handle incoming discovery message (request or response)
 * @net: the applicable net namespace
 * @buf: buffer containing message
 * @bearer: bearer that message arrived on
 */
void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
		   struct tipc_bearer *bearer)
{
	struct tipc_net *tn = net_generic(net, tipc_net_id);
	struct tipc_media_addr maddr;
	struct sk_buff *rskb;
	struct tipc_msg *hdr = buf_msg(skb);
	u32 ddom = msg_dest_domain(hdr);
	u32 onode = msg_prevnode(hdr);
	u32 net_id = msg_bc_netid(hdr);
	u32 mtyp = msg_type(hdr);
	u32 signature = msg_node_sig(hdr);
	u16 caps = msg_node_capabilities(hdr);
	bool respond = false;
	bool dupl_addr = false;
	int err;

	err = bearer->media->msg2addr(bearer, &maddr, msg_media_addr(hdr));
	kfree_skb(skb);
	if (err)
		return;

	/* Ensure message from node is valid and communication is permitted */
	if (net_id != tn->net_id)
		return;
	if (maddr.broadcast)
		return;
	if (!tipc_addr_domain_valid(ddom))
		return;
	if (!tipc_addr_node_valid(onode))
		return;

	if (in_own_node(net, onode)) {
		if (memcmp(&maddr, &bearer->addr, sizeof(maddr)))
			disc_dupl_alert(bearer, tn->own_addr, &maddr);
		return;
	}
	if (!tipc_in_scope(ddom, tn->own_addr))
		return;
	if (!tipc_in_scope(bearer->domain, onode))
		return;

	tipc_node_check_dest(net, onode, bearer, caps, signature,
			     &maddr, &respond, &dupl_addr);
	if (dupl_addr)
		disc_dupl_alert(bearer, onode, &maddr);

	/* Send response, if necessary */
	if (respond && (mtyp == DSC_REQ_MSG)) {
		rskb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
		if (!rskb)
			return;
		tipc_disc_init_msg(net, rskb, DSC_RESP_MSG, bearer);
		tipc_bearer_xmit_skb(net, bearer->identity, rskb, &maddr);
	}
}
void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
{
	struct tipc_node *n_ptr;
	struct tipc_link *link;
	struct tipc_media_addr media_addr;
	struct sk_buff *rbuf;
	struct tipc_msg *msg = buf_msg(buf);
	u32 dest = msg_dest_domain(msg);
	u32 orig = msg_prevnode(msg);
	u32 net_id = msg_bc_netid(msg);
	u32 type = msg_type(msg);
	u32 signature = msg_node_sig(msg);
	int addr_mismatch;
	int link_fully_up;

	media_addr.broadcast = 1;
	b_ptr->media->msg2addr(&media_addr, msg_media_addr(msg));
	kfree_skb(buf);

	/* Ensure message from node is valid and communication is permitted */
	if (net_id != tipc_net_id)
		return;
	if (media_addr.broadcast)
		return;
	if (!tipc_addr_domain_valid(dest))
		return;
	if (!tipc_addr_node_valid(orig))
		return;
	if (orig == tipc_own_addr) {
		if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr)))
			disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
		return;
	}
	if (!tipc_in_scope(dest, tipc_own_addr))
		return;
	if (!tipc_in_scope(b_ptr->link_req->domain, orig))
		return;

	/* Locate structure corresponding to requesting node */
	n_ptr = tipc_node_find(orig);
	if (!n_ptr) {
		n_ptr = tipc_node_create(orig);
		if (!n_ptr)
			return;
	}
	tipc_node_lock(n_ptr);

	/* Prepare to validate requesting node's signature and media address */
	link = n_ptr->links[b_ptr->identity];
	addr_mismatch = (link != NULL) &&
		memcmp(&link->media_addr, &media_addr, sizeof(media_addr));

	/*
	 * Ensure discovery message's signature is correct
	 *
	 * If signature is incorrect and there is no working link to the node,
	 * accept the new signature but invalidate all existing links to the
	 * node so they won't re-activate without a new discovery message.
	 *
	 * If signature is incorrect and the requested link to the node is
	 * working, accept the new signature. (This is an instance of delayed
	 * rediscovery, where a link endpoint was able to re-establish contact
	 * with its peer endpoint on a node that rebooted before receiving a
	 * discovery message from that node.)
	 *
	 * If signature is incorrect and there is a working link to the node
	 * that is not the requested link, reject the request (must be from
	 * a duplicate node).
	 */
	if (signature != n_ptr->signature) {
		if (n_ptr->working_links == 0) {
			struct tipc_link *curr_link;
			int i;

			for (i = 0; i < MAX_BEARERS; i++) {
				curr_link = n_ptr->links[i];
				if (curr_link) {
					memset(&curr_link->media_addr, 0,
					       sizeof(media_addr));
					tipc_link_reset(curr_link);
				}
			}
			addr_mismatch = (link != NULL);
		} else if (tipc_link_is_up(link) && !addr_mismatch) {
			/* delayed rediscovery */
		} else {
			disc_dupl_alert(b_ptr, orig, &media_addr);
			tipc_node_unlock(n_ptr);
			return;
		}
		n_ptr->signature = signature;
	}

	/*
	 * Ensure requesting node's media address is correct
	 *
	 * If media address doesn't match and the link is working, reject the
	 * request (must be from a duplicate node).
	 *
	 * If media address doesn't match and the link is not working, accept
	 * the new media address and reset the link to ensure it starts up
	 * cleanly.
	 */

	if (addr_mismatch) {
		if (tipc_link_is_up(link)) {
			disc_dupl_alert(b_ptr, orig, &media_addr);
			tipc_node_unlock(n_ptr);
			return;
		} else {
			memcpy(&link->media_addr, &media_addr,
			       sizeof(media_addr));
			tipc_link_reset(link);
		}
	}

	/* Create a link endpoint for this bearer, if necessary */
	if (!link) {
		link = tipc_link_create(n_ptr, b_ptr, &media_addr);
		if (!link) {
			tipc_node_unlock(n_ptr);
			return;
		}
	}

	/* Accept discovery message & send response, if necessary */
	link_fully_up = link_working_working(link);

	if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr);
		if (rbuf) {
			b_ptr->media->send_msg(rbuf, b_ptr, &media_addr);
			kfree_skb(rbuf);
		}
	}

	tipc_node_unlock(n_ptr);
}
Ejemplo n.º 3
0
void tipc_disc_recv_msg(struct sk_buff *buf, struct bearer *b_ptr)
{
	struct link *link;
	struct tipc_media_addr media_addr;
	struct tipc_msg *msg = buf_msg(buf);
	u32 dest = msg_dest_domain(msg);
	u32 orig = msg_prevnode(msg);
	u32 net_id = msg_bc_netid(msg);
	u32 type = msg_type(msg);

	msg_get_media_addr(msg, &media_addr);
	buf_discard(buf);

	if (net_id != tipc_net_id)
		return;
	if (!tipc_addr_domain_valid(dest))
		return;
	if (!tipc_addr_node_valid(orig))
		return;
	if (orig == tipc_own_addr) {
		if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr)))
			disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
		return;
	}
	if (!tipc_in_scope(dest, tipc_own_addr))
		return;
	if (in_own_cluster(orig)) {
		/* Always accept link here */
		struct sk_buff *rbuf;
		struct tipc_media_addr *addr;
		struct tipc_node *n_ptr = tipc_node_find(orig);
		int link_fully_up;

		if (n_ptr == NULL) {
			n_ptr = tipc_node_create(orig);
			if (!n_ptr)
				return;
		}
		spin_lock_bh(&n_ptr->lock);

		/* Don't talk to neighbor during cleanup after last session */

		if (n_ptr->cleanup_required) {
			spin_unlock_bh(&n_ptr->lock);
			return;
		}

		link = n_ptr->links[b_ptr->identity];
		if (!link) {
			link = tipc_link_create(b_ptr, orig, &media_addr);
			if (!link) {
				spin_unlock_bh(&n_ptr->lock);
				return;
			}
		}
		addr = &link->media_addr;
		if (memcmp(addr, &media_addr, sizeof(*addr))) {
			if (tipc_link_is_up(link) || (!link->started)) {
				disc_dupl_alert(b_ptr, orig, &media_addr);
				spin_unlock_bh(&n_ptr->lock);
				return;
			}
			warn("Resetting link <%s>, peer interface address changed\n",
			     link->name);
			memcpy(addr, &media_addr, sizeof(*addr));
			tipc_link_reset(link);
		}
		link_fully_up = link_working_working(link);
		spin_unlock_bh(&n_ptr->lock);
		if ((type == DSC_RESP_MSG) || link_fully_up)
			return;
		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
		if (rbuf != NULL) {
			b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
			buf_discard(rbuf);
		}
	}
}
Ejemplo n.º 4
0
void tipc_disc_recv_msg(struct sk_buff *buf, struct bearer *b_ptr)
{
	struct link *link;
	struct tipc_media_addr media_addr;
	struct tipc_msg *msg = buf_msg(buf);
	u32 dest = msg_dest_domain(msg);
	u32 orig = msg_prevnode(msg);
	u32 net_id = msg_bc_netid(msg);
	u32 type = msg_type(msg);

	msg_get_media_addr(msg,&media_addr);
	msg_dbg(msg, "RECV:");
	buf_discard(buf);

	if (net_id != tipc_net_id)
		return;
	if (!tipc_addr_domain_valid(dest))
		return;
	if (!tipc_addr_node_valid(orig))
		return;
	if (orig == tipc_own_addr) {
		if (memcmp(&media_addr, &b_ptr->publ.addr, sizeof(media_addr)))
			disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
		return;
	}
	if (!in_scope(dest, tipc_own_addr))
		return;
	if (is_slave(tipc_own_addr) && is_slave(orig))
		return;
	if (is_slave(orig) && !in_own_cluster(orig))
		return;
	if (in_own_cluster(orig)) {
		/* Always accept link here */
		struct sk_buff *rbuf;
		struct tipc_media_addr *addr;
		struct tipc_node *n_ptr = tipc_node_find(orig);
		int link_fully_up;

		dbg(" in own cluster\n");
		if (n_ptr == NULL) {
			n_ptr = tipc_node_create(orig);
			if (!n_ptr)
				return;
		}
		spin_lock_bh(&n_ptr->lock);
		link = n_ptr->links[b_ptr->identity];
		if (!link) {
			dbg("creating link\n");
			link = tipc_link_create(b_ptr, orig, &media_addr);
			if (!link) {
				spin_unlock_bh(&n_ptr->lock);
				return;
			}
		}
		addr = &link->media_addr;
		if (memcmp(addr, &media_addr, sizeof(*addr))) {
			if (tipc_link_is_up(link) || (!link->started)) {
				disc_dupl_alert(b_ptr, orig, &media_addr);
				spin_unlock_bh(&n_ptr->lock);
				return;
			}
			warn("Resetting link <%s>, peer interface address changed\n",
			     link->name);
			memcpy(addr, &media_addr, sizeof(*addr));
			tipc_link_reset(link);
		}
		link_fully_up = (link->state == WORKING_WORKING);
		spin_unlock_bh(&n_ptr->lock);
		if ((type == DSC_RESP_MSG) || link_fully_up)
			return;
		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, 1, orig, b_ptr);
		if (rbuf != NULL) {
			msg_dbg(buf_msg(rbuf),"SEND:");
			b_ptr->media->send_msg(rbuf, &b_ptr->publ, &media_addr);
			buf_discard(rbuf);
		}
	}
}
Ejemplo n.º 5
0
void tipc_disc_recv_msg(struct sk_buff *buf, struct tipc_bearer *b_ptr)
{
	struct tipc_node *n_ptr;
	struct tipc_link *link;
	struct tipc_media_addr media_addr, *addr;
	struct sk_buff *rbuf;
	struct tipc_msg *msg = buf_msg(buf);
	u32 dest = msg_dest_domain(msg);
	u32 orig = msg_prevnode(msg);
	u32 net_id = msg_bc_netid(msg);
	u32 type = msg_type(msg);
	int link_fully_up;

	media_addr.broadcast = 1;
	b_ptr->media->msg2addr(&media_addr, msg_media_addr(msg));
	buf_discard(buf);

	/* Validate discovery message from requesting node */
	if (net_id != tipc_net_id)
		return;
	if (media_addr.broadcast)
		return;
	if (!tipc_addr_domain_valid(dest))
		return;
	if (!tipc_addr_node_valid(orig))
		return;
	if (orig == tipc_own_addr) {
		if (memcmp(&media_addr, &b_ptr->addr, sizeof(media_addr)))
			disc_dupl_alert(b_ptr, tipc_own_addr, &media_addr);
		return;
	}
	if (!tipc_in_scope(dest, tipc_own_addr))
		return;
	if (!tipc_in_scope(b_ptr->link_req->domain, orig))
		return;

	/* Locate structure corresponding to requesting node */
	n_ptr = tipc_node_find(orig);
	if (!n_ptr) {
		n_ptr = tipc_node_create(orig);
		if (!n_ptr)
			return;
	}
	tipc_node_lock(n_ptr);

	link = n_ptr->links[b_ptr->identity];

	/* Create a link endpoint for this bearer, if necessary */
	if (!link) {
		link = tipc_link_create(n_ptr, b_ptr, &media_addr);
		if (!link) {
			tipc_node_unlock(n_ptr);
			return;
		}
	}

	/*
	 * Ensure requesting node's media address is correct
	 *
	 * If media address doesn't match and the link is working, reject the
	 * request (must be from a duplicate node).
	 *
	 * If media address doesn't match and the link is not working, accept
	 * the new media address and reset the link to ensure it starts up
	 * cleanly.
	 */
	addr = &link->media_addr;
	if (memcmp(addr, &media_addr, sizeof(*addr))) {
		if (tipc_link_is_up(link) || (!link->started)) {
			disc_dupl_alert(b_ptr, orig, &media_addr);
			tipc_node_unlock(n_ptr);
			return;
		}
		warn("Resetting link <%s>, peer interface address changed\n",
		     link->name);
		memcpy(addr, &media_addr, sizeof(*addr));
		tipc_link_reset(link);
	}

	/* Accept discovery message & send response, if necessary */
	link_fully_up = link_working_working(link);

	if ((type == DSC_REQ_MSG) && !link_fully_up && !b_ptr->blocked) {
		rbuf = tipc_disc_init_msg(DSC_RESP_MSG, orig, b_ptr);
		if (rbuf) {
			b_ptr->media->send_msg(rbuf, b_ptr, &media_addr);
			buf_discard(rbuf);
		}
	}

	tipc_node_unlock(n_ptr);
}