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CVS log for src/sys/netinet6/ip6_input.c

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Default branch: MAIN
Current tag: gehenna-devsw-base

Revision 1.57 / (download) - annotate - [select for diffs], Sun Jun 30 22:40:39 2002 UTC (14 years, 6 months ago) by thorpej
Branch: MAIN
CVS Tags: gehenna-devsw-base
Changes since 1.56: +22 -5 lines
Diff to previous 1.56 (colored)

Changes to allow the IPv4 and IPv6 layers to align headers themseves,
as necessary:
* Implement a new mbuf utility routine, m_copyup(), is is like
  m_pullup(), except that it always prepends and copies, rather
  than only doing so if the desired length is larger than m->m_len.
  m_copyup() also allows an offset into the destination mbuf, which
  allows space for packet headers, in the forwarding case.
* Add *_HDR_ALIGNED_P() macros for IP, IPv6, ICMP, and IGMP.  These
  macros expand to 1 if __NO_STRICT_ALIGNMENT is defined, so that
  architectures which do not have strict alignment constraints don't
  pay for the test or visit the new align-if-needed path.
* Use the new macros to check if a header needs to be aligned, or to
  assert that it already is, as appropriate.

Note: This code is still somewhat experimental.  However, the new
code path won't be visited if individual device drivers continue
to guarantee that packets are delivered to layer 3 already properly
aligned (which are rules that are already in use).

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