return skb;
}
-void tipc_msg_init(struct net *net, struct tipc_msg *m, u32 user, u32 type,
- u32 hsize, u32 destnode)
+void tipc_msg_init(u32 own_node, struct tipc_msg *m, u32 user, u32 type,
+ u32 hsize, u32 dnode)
{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
-
memset(m, 0, hsize);
msg_set_version(m);
msg_set_user(m, user);
msg_set_hdr_sz(m, hsize);
msg_set_size(m, hsize);
- msg_set_prevnode(m, tn->own_addr);
+ msg_set_prevnode(m, own_node);
msg_set_type(m, type);
if (hsize > SHORT_H_SIZE) {
- msg_set_orignode(m, tn->own_addr);
- msg_set_destnode(m, destnode);
+ msg_set_orignode(m, own_node);
+ msg_set_destnode(m, dnode);
}
}
-struct sk_buff *tipc_msg_create(struct net *net, uint user, uint type,
+struct sk_buff *tipc_msg_create(uint user, uint type,
uint hdr_sz, uint data_sz, u32 dnode,
u32 onode, u32 dport, u32 oport, int errcode)
{
return NULL;
msg = buf_msg(buf);
- tipc_msg_init(net, msg, user, type, hdr_sz, dnode);
+ tipc_msg_init(onode, msg, user, type, hdr_sz, dnode);
msg_set_size(msg, hdr_sz + data_sz);
- msg_set_prevnode(msg, onode);
msg_set_origport(msg, oport);
msg_set_destport(msg, dport);
msg_set_errcode(msg, errcode);
*
* Returns message data size or errno: -ENOMEM, -EFAULT
*/
-int tipc_msg_build(struct net *net, struct tipc_msg *mhdr, struct msghdr *m,
+int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m,
int offset, int dsz, int pktmax, struct sk_buff_head *list)
{
int mhsz = msg_hdr_sz(mhdr);
}
/* Prepare reusable fragment header */
- tipc_msg_init(net, &pkthdr, MSG_FRAGMENTER, FIRST_FRAGMENT, INT_H_SIZE,
- msg_destnode(mhdr));
+ tipc_msg_init(msg_prevnode(mhdr), &pkthdr, MSG_FRAGMENTER,
+ FIRST_FRAGMENT, INT_H_SIZE, msg_destnode(mhdr));
msg_set_size(&pkthdr, pktmax);
msg_set_fragm_no(&pkthdr, pktno);
return true;
}
+/**
+ * tipc_msg_extract(): extract bundled inner packet from buffer
+ * @skb: linear outer buffer, to be extracted from.
+ * @iskb: extracted inner buffer, to be returned
+ * @pos: position of msg to be extracted. Returns with pointer of next msg
+ * Consumes outer buffer when last packet extracted
+ * Returns true when when there is an extracted buffer, otherwise false
+ */
+bool tipc_msg_extract(struct sk_buff *skb, struct sk_buff **iskb, int *pos)
+{
+ struct tipc_msg *msg = buf_msg(skb);
+ int imsz;
+ struct tipc_msg *imsg = (struct tipc_msg *)(msg_data(msg) + *pos);
+
+ /* Is there space left for shortest possible message? */
+ if (*pos > (msg_data_sz(msg) - SHORT_H_SIZE))
+ goto none;
+ imsz = msg_size(imsg);
+
+ /* Is there space left for current message ? */
+ if ((*pos + imsz) > msg_data_sz(msg))
+ goto none;
+ *iskb = tipc_buf_acquire(imsz);
+ if (!*iskb)
+ goto none;
+ skb_copy_to_linear_data(*iskb, imsg, imsz);
+ *pos += align(imsz);
+ return true;
+none:
+ kfree_skb(skb);
+ *iskb = NULL;
+ return false;
+}
+
/**
* tipc_msg_make_bundle(): Create bundle buf and append message to its tail
* @list: the buffer chain
* Replaces buffer if successful
* Returns true if success, otherwise false
*/
-bool tipc_msg_make_bundle(struct net *net, struct sk_buff_head *list,
+bool tipc_msg_make_bundle(struct sk_buff_head *list,
struct sk_buff *skb, u32 mtu, u32 dnode)
{
struct sk_buff *bskb;
skb_trim(bskb, INT_H_SIZE);
bmsg = buf_msg(bskb);
- tipc_msg_init(net, bmsg, MSG_BUNDLER, 0, INT_H_SIZE, dnode);
+ tipc_msg_init(msg_prevnode(msg), bmsg, MSG_BUNDLER, 0,
+ INT_H_SIZE, dnode);
msg_set_seqno(bmsg, msg_seqno(msg));
msg_set_ack(bmsg, msg_ack(msg));
msg_set_bcast_ack(bmsg, msg_bcast_ack(msg));
* Consumes buffer if failure
* Returns true if success, otherwise false
*/
-bool tipc_msg_reverse(struct net *net, struct sk_buff *buf, u32 *dnode,
+bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
int err)
{
- struct tipc_net *tn = net_generic(net, tipc_net_id);
struct tipc_msg *msg = buf_msg(buf);
uint imp = msg_importance(msg);
struct tipc_msg ohdr;
msg_set_errcode(msg, err);
msg_set_origport(msg, msg_destport(&ohdr));
msg_set_destport(msg, msg_origport(&ohdr));
- msg_set_prevnode(msg, tn->own_addr);
+ msg_set_prevnode(msg, own_addr);
if (!msg_short(msg)) {
msg_set_orignode(msg, msg_destnode(&ohdr));
msg_set_destnode(msg, msg_orignode(&ohdr));
return true;
exit:
kfree_skb(buf);
+ *dnode = 0;
return false;
}
/**
- * tipc_msg_eval: determine fate of message that found no destination
- * @buf: the buffer containing the message.
- * @dnode: return value: next-hop node, if message to be forwarded
- * @err: error code to use, if message to be rejected
- *
+ * tipc_msg_lookup_dest(): try to find new destination for named message
+ * @skb: the buffer containing the message.
+ * @dnode: return value: next-hop node, if destination found
+ * @err: return value: error code to use, if message to be rejected
* Does not consume buffer
- * Returns 0 (TIPC_OK) if message ok and we can try again, -TIPC error
- * code if message to be rejected
+ * Returns true if a destination is found, false otherwise
*/
-int tipc_msg_eval(struct net *net, struct sk_buff *buf, u32 *dnode)
+bool tipc_msg_lookup_dest(struct net *net, struct sk_buff *skb,
+ u32 *dnode, int *err)
{
- struct tipc_msg *msg = buf_msg(buf);
+ struct tipc_msg *msg = buf_msg(skb);
u32 dport;
- if (msg_type(msg) != TIPC_NAMED_MSG)
- return -TIPC_ERR_NO_PORT;
- if (skb_linearize(buf))
- return -TIPC_ERR_NO_NAME;
- if (msg_data_sz(msg) > MAX_FORWARD_SIZE)
- return -TIPC_ERR_NO_NAME;
+ if (!msg_isdata(msg))
+ return false;
+ if (!msg_named(msg))
+ return false;
+ *err = -TIPC_ERR_NO_NAME;
+ if (skb_linearize(skb))
+ return false;
if (msg_reroute_cnt(msg) > 0)
- return -TIPC_ERR_NO_NAME;
-
+ return false;
*dnode = addr_domain(net, msg_lookup_scope(msg));
dport = tipc_nametbl_translate(net, msg_nametype(msg),
- msg_nameinst(msg),
- dnode);
+ msg_nameinst(msg), dnode);
if (!dport)
- return -TIPC_ERR_NO_NAME;
+ return false;
msg_incr_reroute_cnt(msg);
msg_set_destnode(msg, *dnode);
msg_set_destport(msg, dport);
- return TIPC_OK;
+ *err = TIPC_OK;
+ return true;
}
/* tipc_msg_reassemble() - clone a buffer chain of fragments and
projects / linux-2.6-block.git / blobdiff