On Fri, 7 Jun 2002, Archie Cobbs wrote:
> - Rejigger the oltr driver to pass its "secret" information using
> an auxillary mbuf instead of m->m_pkthdr.header.
>
> Any comments/objections?
Please look at the 'kluge' that NetBSD uses.
netinet/if_arp.c:
trh = (struct token_header *)M_TRHSTART(m);
net/if_token.h:
/*
* This is a kludge to get at the token ring mac header and the source route
* information after m_adj() has been used on the mbuf.
* Note that m is always an mbuf with a packet header.
*/
#define M_TRHSTART(m) \
(ALIGN(((m)->m_flags & M_EXT ? (m)->m_ext.ext_buf : &(m)->m_pktdat[0]) \
+ sizeof (struct token_header)) - sizeof(struct token_header))
--
| Matthew N. Dodd | '78 Datsun 280Z | '75 Volvo 164E | FreeBSD/NetBSD |
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