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-rw-r--r--net/tipc/msg.c153
1 files changed, 106 insertions, 47 deletions
diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index a687b30a699c..b6eb90cd3ef7 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -34,6 +34,7 @@
* POSSIBILITY OF SUCH DAMAGE.
*/
+#include <net/sock.h>
#include "core.h"
#include "msg.h"
#include "addr.h"
@@ -46,25 +47,48 @@ static unsigned int align(unsigned int i)
return (i + 3) & ~3u;
}
-void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, u32 hsize,
- u32 destnode)
+/**
+ * tipc_buf_acquire - creates a TIPC message buffer
+ * @size: message size (including TIPC header)
+ *
+ * Returns a new buffer with data pointers set to the specified size.
+ *
+ * NOTE: Headroom is reserved to allow prepending of a data link header.
+ * There may also be unrequested tailroom present at the buffer's end.
+ */
+struct sk_buff *tipc_buf_acquire(u32 size)
+{
+ struct sk_buff *skb;
+ unsigned int buf_size = (BUF_HEADROOM + size + 3) & ~3u;
+
+ skb = alloc_skb_fclone(buf_size, GFP_ATOMIC);
+ if (skb) {
+ skb_reserve(skb, BUF_HEADROOM);
+ skb_put(skb, size);
+ skb->next = NULL;
+ }
+ return skb;
+}
+
+void tipc_msg_init(u32 own_node, struct tipc_msg *m, u32 user, u32 type,
+ u32 hsize, u32 dnode)
{
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, tipc_own_addr);
+ msg_set_prevnode(m, own_node);
msg_set_type(m, type);
if (hsize > SHORT_H_SIZE) {
- msg_set_orignode(m, tipc_own_addr);
- msg_set_destnode(m, destnode);
+ msg_set_orignode(m, own_node);
+ msg_set_destnode(m, dnode);
}
}
-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)
+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)
{
struct tipc_msg *msg;
struct sk_buff *buf;
@@ -74,9 +98,8 @@ struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz,
return NULL;
msg = buf_msg(buf);
- tipc_msg_init(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);
@@ -163,15 +186,14 @@ err:
* tipc_msg_build - create buffer chain containing specified header and data
* @mhdr: Message header, to be prepended to data
* @m: User message
- * @offset: Posision in iov to start copying from
* @dsz: Total length of user data
* @pktmax: Max packet size that can be used
* @list: Buffer or chain of buffers to be returned to caller
*
* Returns message data size or errno: -ENOMEM, -EFAULT
*/
-int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset,
- int dsz, int pktmax, struct sk_buff_head *list)
+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);
int msz = mhsz + dsz;
@@ -191,19 +213,19 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset,
skb = tipc_buf_acquire(msz);
if (unlikely(!skb))
return -ENOMEM;
+ skb_orphan(skb);
__skb_queue_tail(list, skb);
skb_copy_to_linear_data(skb, mhdr, mhsz);
pktpos = skb->data + mhsz;
- if (!dsz || !memcpy_fromiovecend(pktpos, m->msg_iter.iov, offset,
- dsz))
+ if (copy_from_iter(pktpos, dsz, &m->msg_iter) == dsz)
return dsz;
rc = -EFAULT;
goto error;
}
/* Prepare reusable fragment header */
- tipc_msg_init(&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);
@@ -211,6 +233,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset,
skb = tipc_buf_acquire(pktmax);
if (!skb)
return -ENOMEM;
+ skb_orphan(skb);
__skb_queue_tail(list, skb);
pktpos = skb->data;
skb_copy_to_linear_data(skb, &pkthdr, INT_H_SIZE);
@@ -224,12 +247,11 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset,
if (drem < pktrem)
pktrem = drem;
- if (memcpy_fromiovecend(pktpos, m->msg_iter.iov, offset, pktrem)) {
+ if (copy_from_iter(pktpos, pktrem, &m->msg_iter) != pktrem) {
rc = -EFAULT;
goto error;
}
drem -= pktrem;
- offset += pktrem;
if (!drem)
break;
@@ -244,6 +266,7 @@ int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset,
rc = -ENOMEM;
goto error;
}
+ skb_orphan(skb);
__skb_queue_tail(list, skb);
msg_set_type(&pkthdr, FRAGMENT);
msg_set_size(&pkthdr, pktsz);
@@ -304,6 +327,40 @@ bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu)
}
/**
+ * 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
* @skb: buffer to be appended and replaced
@@ -312,8 +369,8 @@ bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu)
* Replaces buffer if successful
* Returns true if success, otherwise false
*/
-bool tipc_msg_make_bundle(struct sk_buff_head *list, struct sk_buff *skb,
- u32 mtu, u32 dnode)
+bool tipc_msg_make_bundle(struct sk_buff_head *list,
+ struct sk_buff *skb, u32 mtu, u32 dnode)
{
struct sk_buff *bskb;
struct tipc_msg *bmsg;
@@ -336,7 +393,8 @@ bool tipc_msg_make_bundle(struct sk_buff_head *list, struct sk_buff *skb,
skb_trim(bskb, INT_H_SIZE);
bmsg = buf_msg(bskb);
- tipc_msg_init(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));
@@ -353,7 +411,8 @@ bool tipc_msg_make_bundle(struct sk_buff_head *list, struct sk_buff *skb,
* Consumes buffer if failure
* Returns true if success, otherwise false
*/
-bool tipc_msg_reverse(struct sk_buff *buf, u32 *dnode, int err)
+bool tipc_msg_reverse(u32 own_addr, struct sk_buff *buf, u32 *dnode,
+ int err)
{
struct tipc_msg *msg = buf_msg(buf);
uint imp = msg_importance(msg);
@@ -374,7 +433,7 @@ bool tipc_msg_reverse(struct sk_buff *buf, u32 *dnode, int err)
msg_set_errcode(msg, err);
msg_set_origport(msg, msg_destport(&ohdr));
msg_set_destport(msg, msg_origport(&ohdr));
- msg_set_prevnode(msg, tipc_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));
@@ -386,43 +445,43 @@ bool tipc_msg_reverse(struct sk_buff *buf, u32 *dnode, int err)
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 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;
-
- *dnode = addr_domain(msg_lookup_scope(msg));
- dport = tipc_nametbl_translate(msg_nametype(msg),
- msg_nameinst(msg),
- dnode);
+ return false;
+ *dnode = addr_domain(net, msg_lookup_scope(msg));
+ dport = tipc_nametbl_translate(net, msg_nametype(msg),
+ 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
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 23:24:33 +0000