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Add m_demote(struct mbuf *m, int all) to clean up mbuf (chain) from

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any tags and packet headers.  If "all" is set then the first mbuf
in the chain will be cleaned too.

This function is used before an mbuf, that arrived as packet with
m->flags & M_PKTHDR, is appended to an mbuf chain using m->m_next
(not m->m_nextpkt).

Reviewed by:	glebius
This commit is contained in:
Andre Oppermann 2005-08-29 19:45:39 +00:00
parent 919ccba73e
commit ed111688e9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=149598
2 changed files with 25 additions and 0 deletions
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24
sys/kern/uipc_mbuf.c
View File

@ -269,6 +269,30 @@ mb_free_ext(struct mbuf *m)
uma_zfree(zone_mbuf, m);
}
/*
* Clean up mbuf (chain) from any tags and packet headers.
* If "all" is set then the first mbuf in the chain will be
* cleaned too.
*/
void
m_demote(struct mbuf *m0, int all)
{
struct mbuf *m;
for (m = all ? m0 : m0->m_next; m != NULL; m = m->m_next) {
if (m->m_flags & M_PKTHDR) {
m_tag_delete_chain(m, NULL);
m->m_flags &= ~M_PKTHDR;
bzero(&m->m_pkthdr, sizeof(struct pkthdr));
}
if (m->m_type & MT_HEADER)
m->m_type = MT_DATA;
if (m != m0 && m->m_nextpkt)
m->m_nextpkt = NULL;
m->m_flags = m->m_flags & (M_EXT|M_EOR|M_RDONLY|M_FREELIST);
}
}
/*
* "Move" mbuf pkthdr from "from" to "to".
* "from" must have M_PKTHDR set, and "to" must be empty.

1
sys/sys/mbuf.h
View File

@ -577,6 +577,7 @@ struct mbuf *m_copypacket(struct mbuf *, int);
void m_copy_pkthdr(struct mbuf *, struct mbuf *);
struct mbuf *m_copyup(struct mbuf *n, int len, int dstoff);
struct mbuf *m_defrag(struct mbuf *, int);
void m_demote(struct mbuf *, int);
struct mbuf *m_devget(char *, int, int, struct ifnet *,
void (*)(char *, caddr_t, u_int));
struct mbuf *m_dup(struct mbuf *, int);