/*
* Duplicate "from"'s mbuf pkthdr in "to".
* "from" must have M_PKTHDR set, and "to" must be empty.
* In particular, this does a deep copy of the packet tags.
*/
int
m_dup_pkthdr(struct mbuf *to, const struct mbuf *from, int how)
{
#if 0
/*
* The mbuf allocator only initializes the pkthdr
* when the mbuf is allocated with m_gethdr(). Many users
* (e.g. m_copy*, m_prepend) use m_get() and then
* smash the pkthdr as needed causing these
* assertions to trip. For now just disable them.
*/
M_ASSERTPKTHDR(to);
/* Note: with MAC, this may not be a good assertion. */
KASSERT(SLIST_EMPTY(&to->m_pkthdr.tags), ("m_dup_pkthdr: to has tags"));
#endif
MBUF_CHECKSLEEP(how);
#ifdef MAC
if (to->m_flags & M_PKTHDR)
m_tag_delete_chain(to, NULL);
#endif
to->m_flags = (from->m_flags & M_COPYFLAGS) | (to->m_flags & M_EXT);
if ((to->m_flags & M_EXT) == 0)
to->m_data = to->m_pktdat;
to->m_pkthdr = from->m_pkthdr;
SLIST_INIT(&to->m_pkthdr.tags);
return (m_tag_copy_chain(to, from, how));
}
/*
* Duplicate mbuf pkthdr from from to to.
* from must have M_PKTHDR set, and to must be empty.
*/
int
m_dup_pkthdr(struct mbuf *to, struct mbuf *from, int wait)
{
int error;
KASSERT(from->m_flags & M_PKTHDR);
to->m_flags = (to->m_flags & (M_EXT | M_EXTWR));
to->m_flags |= (from->m_flags & M_COPYFLAGS);
to->m_pkthdr = from->m_pkthdr;
SLIST_INIT(&to->m_pkthdr.tags);
if ((error = m_tag_copy_chain(to, from, wait)) != 0)
return (error);
if ((to->m_flags & M_EXT) == 0)
to->m_data = to->m_pktdat;
return (0);
}
