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network: do not set broadcast if prefixlen is 31 or 32

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After fe841414ef, broadcast address is
also compared with existing one to determine whether the address is
foregin or not. So, the address object should not contain unnecessary
information.

Fixes #17803.
This commit is contained in:
Yu Watanabe 2020-12-02 19:19:06 +09:00
parent 565147b7bb
commit df8aa08642
1 changed files with 2 additions and 1 deletions
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3
src/network/networkd-dhcp4.c
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@ -865,7 +865,8 @@ static int dhcp4_update_address(Link *link, bool announce) {
addr->cinfo.ifa_prefered = lifetime;
addr->cinfo.ifa_valid = lifetime;
addr->prefixlen = prefixlen;
addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr;
if (prefixlen <= 30)
addr->broadcast.s_addr = address.s_addr | ~netmask.s_addr;
SET_FLAG(addr->flags, IFA_F_NOPREFIXROUTE, !link_prefixroute(link));
/* allow reusing an existing address and simply update its lifetime