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Diffstat (limited to 'net/tipc/msg.c')
-rw-r--r--net/tipc/msg.c94
1 files changed, 94 insertions, 0 deletions
diff --git a/net/tipc/msg.c b/net/tipc/msg.c
index 73dcd00d674e..381063817b41 100644
--- a/net/tipc/msg.c
+++ b/net/tipc/msg.c
@@ -40,6 +40,100 @@
#include "msg.h"
#include "bearer.h"
+u32 tipc_msg_tot_importance(struct tipc_msg *m)
+{
+ if (likely(msg_isdata(m))) {
+ if (likely(msg_orignode(m) == tipc_own_addr))
+ return msg_importance(m);
+ return msg_importance(m) + 4;
+ }
+ if ((msg_user(m) == MSG_FRAGMENTER) &&
+ (msg_type(m) == FIRST_FRAGMENT))
+ return msg_importance(msg_get_wrapped(m));
+ return msg_importance(m);
+}
+
+
+void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type,
+ u32 hsize, u32 destnode)
+{
+ 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_type(m, type);
+ if (!msg_short(m)) {
+ msg_set_orignode(m, tipc_own_addr);
+ msg_set_destnode(m, destnode);
+ }
+}
+
+/**
+ * tipc_msg_calc_data_size - determine total data size for message
+ */
+
+int tipc_msg_calc_data_size(struct iovec const *msg_sect, u32 num_sect)
+{
+ int dsz = 0;
+ int i;
+
+ for (i = 0; i < num_sect; i++)
+ dsz += msg_sect[i].iov_len;
+ return dsz;
+}
+
+/**
+ * tipc_msg_build - create message using specified header and data
+ *
+ * Note: Caller must not hold any locks in case copy_from_user() is interrupted!
+ *
+ * Returns message data size or errno
+ */
+
+int tipc_msg_build(struct tipc_msg *hdr,
+ struct iovec const *msg_sect, u32 num_sect,
+ int max_size, int usrmem, struct sk_buff** buf)
+{
+ int dsz, sz, hsz, pos, res, cnt;
+
+ dsz = tipc_msg_calc_data_size(msg_sect, num_sect);
+ if (unlikely(dsz > TIPC_MAX_USER_MSG_SIZE)) {
+ *buf = NULL;
+ return -EINVAL;
+ }
+
+ pos = hsz = msg_hdr_sz(hdr);
+ sz = hsz + dsz;
+ msg_set_size(hdr, sz);
+ if (unlikely(sz > max_size)) {
+ *buf = NULL;
+ return dsz;
+ }
+
+ *buf = buf_acquire(sz);
+ if (!(*buf))
+ return -ENOMEM;
+ skb_copy_to_linear_data(*buf, hdr, hsz);
+ for (res = 1, cnt = 0; res && (cnt < num_sect); cnt++) {
+ if (likely(usrmem))
+ res = !copy_from_user((*buf)->data + pos,
+ msg_sect[cnt].iov_base,
+ msg_sect[cnt].iov_len);
+ else
+ skb_copy_to_linear_data_offset(*buf, pos,
+ msg_sect[cnt].iov_base,
+ msg_sect[cnt].iov_len);
+ pos += msg_sect[cnt].iov_len;
+ }
+ if (likely(res))
+ return dsz;
+
+ buf_discard(*buf);
+ *buf = NULL;
+ return -EFAULT;
+}
#ifdef CONFIG_TIPC_DEBUG