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routing: Fix newly-added rt_get_inet[6]_parent() api.

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Correctly handle the case when no default route is present.

Reported by:	Konrad <konrad.kreciwilk at korbank.pl>

(cherry picked from commit f84c30106e)
This commit is contained in:
Alexander V. Chernikov 2021-08-30 21:10:37 +00:00
parent 4e97cbba1c
commit 0e77fc2a79
1 changed files with 6 additions and 0 deletions
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6
sys/net/route/route_helpers.c
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@ -434,6 +434,9 @@ get_inet_parent_prefix(uint32_t fibnum, struct in_addr addr, int plen)
struct radix_node *rn;
rt = fib4_lookup_rt(fibnum, addr, 0, NHR_UNLOCKED, &rnd);
if (rt == NULL)
return (NULL);
rt_get_inet_prefix_plen(rt, &addr4, &parent_plen, &scopeid);
if (parent_plen <= plen)
return (rt);
@ -503,6 +506,9 @@ get_inet6_parent_prefix(uint32_t fibnum, const struct in6_addr *paddr, int plen)
struct radix_node *rn;
rt = fib6_lookup_rt(fibnum, paddr, 0, NHR_UNLOCKED, &rnd);
if (rt == NULL)
return (NULL);
rt_get_inet6_prefix_plen(rt, &addr6, &parent_plen, &scopeid);
if (parent_plen <= plen)
return (rt);