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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 (15 years, 9 months ago) by thorpej
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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