examples: Add extension header octet to example

Mainly to make data/packets look (pseudo-)correct in Wireshark.

Also: Add helper for allocating message buffers with extended headroom for IPA.

Change-Id: I962b9edcba65cdc98da00d2f8753dc5acd481502

1 files changed, 5 insertions, 0 deletions

diff --git a/src/ipa.c b/src/ipa.c
index 197a47f..5f62e88 100644
--- a/src/ipa.c
+++ b/src/ipa.c
@@ -97,6 +97,11 @@ struct msgb *osmo_ipa_msg_alloc(int headroom)
 	return msg;
 }
 
+struct msgb *osmo_ipa_ext_msg_alloc(size_t headroom)
+{
+	return osmo_ipa_msg_alloc(sizeof(struct ipa_head_ext) + headroom);
+}
+
 void osmo_ipa_msg_push_header(struct msgb *msg, uint8_t proto)
 {
 	struct ipa_head *hh;