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-rw-r--r--include/osmocom/core/msgb.h12
1 files changed, 12 insertions, 0 deletions
diff --git a/include/osmocom/core/msgb.h b/include/osmocom/core/msgb.h
index b1cb6ec7..8843db01 100644
--- a/include/osmocom/core/msgb.h
+++ b/include/osmocom/core/msgb.h
@@ -169,6 +169,18 @@ static inline unsigned int msgb_l3len(const struct msgb *msgb)
return msgb->tail - (uint8_t *)msgb_l3(msgb);
}
+/*! determine length of L4 message
+ * \param[in] msgb message buffer
+ * \returns size of L4 message in bytes
+ *
+ * This function computes the number of bytes between the tail of the
+ * message and the layer 4 header.
+ */
+static inline unsigned int msgb_l4len(const struct msgb *msgb)
+{
+ return msgb->tail - (uint8_t *)msgb_sms(msgb);
+}
+
/*! determine the length of the header
* \param[in] msgb message buffer
* \returns number of bytes between start of buffer and start of msg