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Netlink: Do unified scan for both IPv4 and IPv6

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Instead of separate scans for IPv4, IPv6 and MPLS, do one AF_UNSPEC scan.

This also avoids kernel issue when kernel reported IPv4 and IPv6 routes
during MPLS scan if MPLS is not active.
This commit is contained in:
Ondrej Zajicek (work) 2019-07-02 16:30:36 +02:00
parent 026bfedb33
commit 1187627a1d
1 changed files with 8 additions and 29 deletions
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37
sysdep/linux/netlink.c
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@ -1393,10 +1393,10 @@ krt_replace_rte(struct krt_proto *p, net *n, rte *new, rte *old)
} }
static int static int
nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint priority, uint krt_type) nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint priority, uint krt_type, uint rtm_family)
{ {
/* Route merging must be active */ /* Route merging is used for IPv6 scans */
if (!s->merge) if (!s->scan || (rtm_family != AF_INET6))
return 0; return 0;
/* Saved and new route must have same network, proto/table, and priority */ /* Saved and new route must have same network, proto/table, and priority */
@ -1433,12 +1433,11 @@ nl_announce_route(struct nl_parse_state *s)
} }
static inline void static inline void
nl_parse_begin(struct nl_parse_state *s, int scan, int merge) nl_parse_begin(struct nl_parse_state *s, int scan)
{ {
memset(s, 0, sizeof (struct nl_parse_state)); memset(s, 0, sizeof (struct nl_parse_state));
s->pool = nl_linpool; s->pool = nl_linpool;
s->scan = scan; s->scan = scan;
s->merge = merge;
} }
static inline void static inline void
@ -1581,7 +1580,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
net *net = net_get(p->p.main_channel->table, n); net *net = net_get(p->p.main_channel->table, n);
if (s->net && !nl_mergable_route(s, net, p, priority, i->rtm_type)) if (s->net && !nl_mergable_route(s, net, p, priority, i->rtm_type, i->rtm_family))
nl_announce_route(s); nl_announce_route(s);
rta *ra = lp_allocz(s->pool, RTA_MAX_SIZE); rta *ra = lp_allocz(s->pool, RTA_MAX_SIZE);
@ -1814,34 +1813,14 @@ krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NUL
struct nlmsghdr *h; struct nlmsghdr *h;
struct nl_parse_state s; struct nl_parse_state s;
nl_parse_begin(&s, 1, 0); nl_parse_begin(&s, 1);
nl_request_dump(AF_INET, RTM_GETROUTE); nl_request_dump(AF_UNSPEC, RTM_GETROUTE);
while (h = nl_get_scan()) while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE) if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
nl_parse_route(&s, h); nl_parse_route(&s, h);
else else
log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type); log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
nl_parse_end(&s); nl_parse_end(&s);
nl_parse_begin(&s, 1, 1);
nl_request_dump(AF_INET6, RTM_GETROUTE);
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
nl_parse_route(&s, h);
else
log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
nl_parse_end(&s);
#ifdef HAVE_MPLS_KERNEL
nl_parse_begin(&s, 1, 1);
nl_request_dump(AF_MPLS, RTM_GETROUTE);
while (h = nl_get_scan())
if (h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)
nl_parse_route(&s, h);
else
log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
nl_parse_end(&s);
#endif
} }
/* /*
@ -1861,7 +1840,7 @@ nl_async_msg(struct nlmsghdr *h)
case RTM_NEWROUTE: case RTM_NEWROUTE:
case RTM_DELROUTE: case RTM_DELROUTE:
DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type); DBG("KRT: Received async route notification (%d)\n", h->nlmsg_type);
nl_parse_begin(&s, 0, 0); nl_parse_begin(&s, 0);
nl_parse_route(&s, h); nl_parse_route(&s, h);
nl_parse_end(&s); nl_parse_end(&s);
break; break;