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Netlink: Explicitly skip received cloned routes

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Kernel uses cloned routes to keep route cache entries, but reports them
together with regular routes. They were skipped implicitly as they
do not have rtm_protocol filled. Add explicit check for cloned flag
and skip such routes explicitly.

Also, improve debug logs of skipped routes.
This commit is contained in:
Ondrej Zajicek (work) 2022-01-14 19:07:57 +01:00
parent 60e9def9ef
commit d0dd1d20cd
1 changed files with 7 additions and 3 deletions
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10
sysdep/linux/netlink.c
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@ -1535,7 +1535,8 @@ nl_parse_end(struct nl_parse_state *s)
}
#define SKIP(ARG...) do { DBG("KRT: Ignoring route - " ARG); return; } while(0)
#define SKIP0(ARG, ...) do { DBG("KRT: Ignoring route - " ARG, ##__VA_ARGS__); return; } while(0)
#define SKIP(ARG, ...) do { DBG("KRT: Ignoring route %N - " ARG, &dst, ##__VA_ARGS__); return; } while(0)
static void
nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
@ -1588,10 +1589,10 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
return;
if (!a[RTA_DST])
SKIP("MPLS route without RTA_DST");
SKIP0("MPLS route without RTA_DST\n");
if (rta_get_mpls(a[RTA_DST], rta_mpls_stack) != 1)
SKIP("MPLS route with multi-label RTA_DST");
SKIP0("MPLS route with multi-label RTA_DST\n");
net_fill_mpls(&dst, rta_mpls_stack[0]);
break;
@ -1609,6 +1610,9 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
else
table_id = i->rtm_table;
if (i->rtm_flags & RTM_F_CLONED)
SKIP("cloned\n");
/* Do we know this table? */
p = HASH_FIND(nl_table_map, RTH, i->rtm_family, table_id);
if (!p)