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KRT: Add krt_scope attribute

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Add a new route attribute, krt_scope, to expose the Linux kernel route
scope. Constants from /etc/iproute2/rt_scopes (prefixed by "ips_") are
expected to be used with the attribute. Both import and export are
supported.

Also, the patch fixes device route export to the kernel, by setting link
scope automatically.
This commit is contained in:
Ondrej Zajicek (work)
2016-09-19 12:29:56 +02:00
parent 292f7858e6
commit 6e75d0d27f
4 changed files with 38 additions and 8 deletions
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33
sysdep/linux/netlink.c
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@@ -899,7 +899,7 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int op, int d
r.r.rtm_family = BIRD_AF;
r.r.rtm_dst_len = net->n.pxlen;
r.r.rtm_protocol = RTPROT_BIRD;
r.r.rtm_scope = RT_SCOPE_UNIVERSE;
r.r.rtm_scope = RT_SCOPE_NOWHERE;
nl_add_attr_ipa(&r.h, sizeof(r), RTA_DST, net->n.prefix);
/*
@@ -928,6 +928,12 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int op, int d
if (op == NL_OP_DELETE)
goto dest;
/* Default scope is LINK for device routes, UNIVERSE otherwise */
if (ea = ea_find(eattrs, EA_KRT_SCOPE))
r.r.rtm_scope = ea->u.data;
else
r.r.rtm_scope = (dest == RTD_DEVICE) ? RT_SCOPE_LINK : RT_SCOPE_UNIVERSE;
if (ea = ea_find(eattrs, EA_KRT_PREFSRC))
nl_add_attr_ipa(&r.h, sizeof(r), RTA_PREFSRC, *(ip_addr *)ea->u.ptr->data);
@@ -1135,6 +1141,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
u32 oif = ~0;
u32 table;
u32 priority = 0;
u32 def_scope = RT_SCOPE_UNIVERSE;
int src;
if (!(i = nl_checkin(h, sizeof(*i))))
@@ -1157,7 +1164,6 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
return;
}
if (a[RTA_DST])
{
memcpy(&dst, RTA_DATA(a[RTA_DST]), sizeof(dst));
@@ -1195,11 +1201,6 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
if ((c < 0) || !(c & IADDR_HOST) || ((c & IADDR_SCOPE_MASK) <= SCOPE_LINK))
SKIP("strange class/scope\n");
// ignore rtm_scope, it is not a real scope
// if (i->rtm_scope != RT_SCOPE_UNIVERSE)
// SKIP("scope %u\n", i->rtm_scope);
switch (i->rtm_protocol)
{
case RTPROT_UNSPEC:
@@ -1286,6 +1287,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
else
{
ra->dest = RTD_DEVICE;
def_scope = RT_SCOPE_LINK;
}
break;
@@ -1304,6 +1306,19 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
return;
}
if (i->rtm_scope != def_scope)
{
ea_list *ea = lp_alloc(s->pool, sizeof(ea_list) + sizeof(eattr));
ea->next = ra->eattrs;
ra->eattrs = ea;
ea->flags = EALF_SORTED;
ea->count = 1;
ea->attrs[0].id = EA_KRT_SCOPE;
ea->attrs[0].flags = 0;
ea->attrs[0].type = EAF_TYPE_INT;
ea->attrs[0].u.data = i->rtm_scope;
}
if (a[RTA_PREFSRC])
{
ip_addr ps;
@@ -1633,6 +1648,10 @@ krt_sys_get_attr(eattr *a, byte *buf, int buflen UNUSED)
bsprintf(buf, "realm");
return GA_NAME;
case EA_KRT_SCOPE:
bsprintf(buf, "scope");
return GA_NAME;
case EA_KRT_LOCK:
buf += bsprintf(buf, "lock:");
ea_format_bitfield(a, buf, buflen, krt_metrics_names, 2, KRT_METRICS_MAX);