musl - musl - an implementation of the standard library for Linux-based systems

fix erroneous definition of IN6_IS_ADDR_V4COMPAT

v4-compatible addresses in ipv6 are a deprecated feature where the high 96 bits are all zero and an ipv4 address is stored in the low 32 bits. however, since :: and ::1 are the unspecified and loopback addresses, these two particular values are excluded from the definition of the v4-compat class. our version of the macro incorrectly assessed this condition by checking only the high 96 and low 8 bits. this incorrectly excluded the v4compat version of any ipv4 address ending in .1, not just ::1. rather than writing out non-obvious or error-prone conditions on the individual address bytes, just express the "not :: or ::1" condition naturally using the existing IN6_IS_ADDR_UNSPECIFIED and IN6_IS_ADDR_LOOPBACK macros, after checking that the high 96 bits are all zero. any vaguely reasonable compiler will collapse out the redundant tests of the upper bits as part of CSE.

Diffstat (limited to 'include/netinet')

1 files changed, 2 insertions, 1 deletions