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Split route data structure to storage (ro) / manipulation (rw) structures.

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Routes are now allocated only when they are just to be inserted to the
table. Updating a route needs a locally allocated route structure.
Ownership of the attributes is also now not transfered from protocols to
tables and vice versa but just borrowed which should be easier to handle
in a multithreaded environment.
This commit is contained in:
Maria Matejka
2020-01-28 11:42:46 +01:00
committed by Maria Matejka
parent 60880b539b
commit 69d1ffde4c
27 changed files with 611 additions and 875 deletions
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58
sysdep/linux/netlink.c
View File

@@ -105,7 +105,7 @@ struct nl_parse_state
int scan;
int merge;
net *net;
net_addr *net;
rta *attrs;
struct krt_proto *proto;
s8 new;
@@ -1233,10 +1233,9 @@ nh_bufsize(struct nexthop *nh)
}
static int
nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
nl_send_route(struct krt_proto *p, const rte *e, int op, int dest, struct nexthop *nh)
{
eattr *ea;
net *net = e->net;
rta *a = e->attrs;
ea_list *eattrs = a->eattrs;
int bufsize = 128 + KRT_METRICS_MAX*8 + nh_bufsize(&(a->nh));
@@ -1251,7 +1250,7 @@ nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
int rsize = sizeof(*r) + bufsize;
r = alloca(rsize);
DBG("nl_send_route(%N,op=%x)\n", net->n.addr, op);
DBG("nl_send_route(%N,op=%x)\n", e->net, op);
bzero(&r->h, sizeof(r->h));
bzero(&r->r, sizeof(r->r));
@@ -1260,7 +1259,7 @@ nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
r->h.nlmsg_flags = op | NLM_F_REQUEST | NLM_F_ACK;
r->r.rtm_family = p->af;
r->r.rtm_dst_len = net_pxlen(net->n.addr);
r->r.rtm_dst_len = net_pxlen(e->net);
r->r.rtm_protocol = RTPROT_BIRD;
r->r.rtm_scope = RT_SCOPE_NOWHERE;
#ifdef HAVE_MPLS_KERNEL
@@ -1272,7 +1271,7 @@ nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
* 2) Never use RTA_PRIORITY
*/
u32 label = net_mpls(net->n.addr);
u32 label = net_mpls(e->net);
nl_add_attr_mpls(&r->h, rsize, RTA_DST, 1, &label);
r->r.rtm_scope = RT_SCOPE_UNIVERSE;
r->r.rtm_type = RTN_UNICAST;
@@ -1280,12 +1279,12 @@ nl_send_route(struct krt_proto *p, rte *e, int op, int dest, struct nexthop *nh)
else
#endif
{
nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr));
nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(e->net));
/* Add source address for IPv6 SADR routes */
if (net->n.addr->type == NET_IP6_SADR)
if (e->net->type == NET_IP6_SADR)
{
net_addr_ip6_sadr *a = (void *) &net->n.addr;
net_addr_ip6_sadr *a = (void *) &e->net;
nl_add_attr_ip6(&r->h, rsize, RTA_SRC, a->src_prefix);
r->r.rtm_src_len = a->src_pxlen;
}
@@ -1406,7 +1405,7 @@ nl_add_rte(struct krt_proto *p, rte *e)
}
static inline int
nl_delete_rte(struct krt_proto *p, rte *e)
nl_delete_rte(struct krt_proto *p, const rte *e)
{
int err = 0;
@@ -1427,7 +1426,7 @@ nl_replace_rte(struct krt_proto *p, rte *e)
void
krt_replace_rte(struct krt_proto *p, net *n UNUSED, rte *new, rte *old)
krt_replace_rte(struct krt_proto *p, const net_addr *n UNUSED, rte *new, const rte *old)
{
int err = 0;
@@ -1466,7 +1465,7 @@ krt_replace_rte(struct krt_proto *p, net *n UNUSED, rte *new, rte *old)
}
static int
nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint priority, uint krt_type, uint rtm_family)
nl_mergable_route(struct nl_parse_state *s, const net_addr *net, struct krt_proto *p, uint priority, uint krt_type, uint rtm_family)
{
/* Route merging is used for IPv6 scans */
if (!s->scan || (rtm_family != AF_INET6))
@@ -1486,12 +1485,14 @@ nl_mergable_route(struct nl_parse_state *s, net *net, struct krt_proto *p, uint
static void
nl_announce_route(struct nl_parse_state *s)
{
rte *e = rte_get_temp(s->attrs, s->proto->p.main_source);
e->net = s->net;
rte e0 = {
.attrs = s->attrs,
.net = s->net,
};
ea_list *ea = alloca(sizeof(ea_list) + 2 * sizeof(eattr));
*ea = (ea_list) { .count = 2, .next = e->attrs->eattrs };
e->attrs->eattrs = ea;
*ea = (ea_list) { .count = 2, .next = e0.attrs->eattrs };
e0.attrs->eattrs = ea;
ea->attrs[0] = (eattr) {
.id = EA_KRT_SOURCE,
@@ -1505,9 +1506,9 @@ nl_announce_route(struct nl_parse_state *s)
};
if (s->scan)
krt_got_route(s->proto, e, s->krt_src);
krt_got_route(s->proto, &e0, s->krt_src);
else
krt_got_route_async(s->proto, e, s->new, s->krt_src);
krt_got_route_async(s->proto, &e0, s->new, s->krt_src);
s->net = NULL;
s->attrs = NULL;
@@ -1653,16 +1654,14 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
krt_src = KRT_SRC_ALIEN;
}
net_addr *n = &dst;
net_addr *net = &dst;
if (p->p.net_type == NET_IP6_SADR)
{
n = alloca(sizeof(net_addr_ip6_sadr));
net_fill_ip6_sadr(n, net6_prefix(&dst), net6_pxlen(&dst),
net = alloca(sizeof(net_addr_ip6_sadr));
net_fill_ip6_sadr(net, net6_prefix(&dst), net6_pxlen(&dst),
net6_prefix(&src), net6_pxlen(&src));
}
net *net = net_get(p->p.main_channel->table, n);
if (s->net && !nl_mergable_route(s, net, p, priority, i->rtm_type, i->rtm_family))
nl_announce_route(s);
@@ -1685,7 +1684,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
struct nexthop *nh = nl_parse_multipath(s, p, a[RTA_MULTIPATH], i->rtm_family);
if (!nh)
{
log(L_ERR "KRT: Received strange multipath route %N", net->n.addr);
log(L_ERR "KRT: Received strange multipath route %N", net);
return;
}
@@ -1699,7 +1698,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
ra->nh.iface = if_find_by_index(oif);
if (!ra->nh.iface)
{
log(L_ERR "KRT: Received route %N with unknown ifindex %u", net->n.addr, oif);
log(L_ERR "KRT: Received route %N with unknown ifindex %u", net, oif);
return;
}
@@ -1726,8 +1725,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
(ra->nh.flags & RNF_ONLINK) ? NEF_ONLINK : 0);
if (!nbr || (nbr->scope == SCOPE_HOST))
{
log(L_ERR "KRT: Received route %N with strange next-hop %I", net->n.addr,
ra->nh.gw);
log(L_ERR "KRT: Received route %N with strange next-hop %I", net, ra->nh.gw);
return;
}
}
@@ -1826,7 +1824,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
if (nl_parse_metrics(a[RTA_METRICS], metrics, ARRAY_SIZE(metrics)) < 0)
{
log(L_ERR "KRT: Received route %N with strange RTA_METRICS attribute", net->n.addr);
log(L_ERR "KRT: Received route %N with strange RTA_METRICS attribute", net);
return;
}
@@ -1860,7 +1858,9 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
if (!s->net)
{
/* Store the new route */
s->net = net;
s->net = lp_alloc(s->pool, net->length);
net_copy(s->net, net);
s->attrs = ra;
s->proto = p;
s->new = new;