From 08571b20598c58877e1565403d970efc2b90dba6 Mon Sep 17 00:00:00 2001
From: Maria Matejka <mq@ucw.cz>
Date: Sun, 15 Oct 2023 16:04:36 +0200
Subject: ASPA: basic data structures and Static protocol support

---
 proto/bgp/attrs.c     |  2 +-
 proto/static/config.Y | 29 +++++++++++++++++++++++++++++
 proto/static/static.c | 26 ++++++++++++++++++++++++++
 proto/static/static.h |  5 ++++-
 4 files changed, 60 insertions(+), 2 deletions(-)

(limited to 'proto')

diff --git a/proto/bgp/attrs.c b/proto/bgp/attrs.c
index 85646647..5bd05fb2 100644
--- a/proto/bgp/attrs.c
+++ b/proto/bgp/attrs.c
@@ -690,7 +690,7 @@ static void
 bgp_format_cluster_list(const eattr *a, byte *buf, uint size)
 {
   /* Truncates cluster lists larger than buflen, probably not a problem */
-  int_set_format(a->u.ptr, 0, -1, buf, size);
+  int_set_format(a->u.ptr, ISF_ROUTER_ID, -1, buf, size);
 }
 
 
diff --git a/proto/static/config.Y b/proto/static/config.Y
index f1825edf..58d22d3a 100644
--- a/proto/static/config.Y
+++ b/proto/static/config.Y
@@ -15,6 +15,7 @@ CF_DEFINES
 #define STATIC_CFG ((struct static_config *) this_proto)
 static struct static_route *this_srt, *this_snh;
 static struct f_inst *this_srt_cmds, *this_srt_last_cmd;
+static uint this_srt_aspa_max;
 
 static struct static_route *
 static_nexthop_new(void)
@@ -47,6 +48,7 @@ CF_DECLS
 
 CF_KEYWORDS(STATIC, ROUTE, VIA, DROP, REJECT, PROHIBIT, PREFERENCE, CHECK, LINK, DEV)
 CF_KEYWORDS(ONLINK, WEIGHT, RECURSIVE, IGP, TABLE, BLACKHOLE, UNREACHABLE, BFD, MPLS)
+CF_KEYWORDS(TRANSIT, PROVIDERS)
 
 
 CF_GRAMMAR
@@ -148,8 +150,35 @@ stat_route:
  | stat_route0 BLACKHOLE	{ this_srt->dest = RTD_BLACKHOLE; }
  | stat_route0 UNREACHABLE	{ this_srt->dest = RTD_UNREACHABLE; }
  | stat_route0 PROHIBIT		{ this_srt->dest = RTD_PROHIBIT; }
+ | stat_route0 PROVIDER {
+    if (this_srt->net->type != NET_ASPA) cf_error("Provider settings available only for ASPA");
+    this_srt->aspa = cfg_alloc(sizeof (adata) + (this_srt_aspa_max = 8) * sizeof (u32));
+    this_srt->aspa->length = 0;
+   } stat_aspa_providers
+ | stat_route0 TRANSIT {
+    if (this_srt->net->type != NET_ASPA) cf_error("Transit settings available only for ASPA");
+    /* Allocate an explicit zero */
+    this_srt->aspa = cfg_alloc(sizeof (adata) + sizeof (u32));
+    this_srt->aspa->length = sizeof(u32);
+    ((u32 *) this_srt->aspa->data)[0] = 0;
+   }
  ;
 
+stat_aspa_provider: NUM {
+  if (this_srt->aspa->length == this_srt_aspa_max * sizeof(u32))
+  {
+    adata *new = cfg_alloc(sizeof (adata) + (this_srt_aspa_max * 2) * sizeof (u32));
+    memcpy(new, this_srt->aspa, this_srt->aspa->length + sizeof(adata));
+    this_srt->aspa = new;
+    this_srt_aspa_max *= 2;
+  }
+
+  ((u32 *) this_srt->aspa->data)[this_srt->aspa->length / sizeof(u32)] = $1;
+  this_srt->aspa->length += sizeof(u32);
+}
+
+stat_aspa_providers: stat_aspa_provider | stat_aspa_providers ',' stat_aspa_provider ;
+
 stat_route_item:
    cmd {
      if (this_srt_last_cmd)
diff --git a/proto/static/static.c b/proto/static/static.c
index 071803a8..661d04aa 100644
--- a/proto/static/static.c
+++ b/proto/static/static.c
@@ -99,6 +99,32 @@ static_announce_rte(struct static_proto *p, struct static_route *r)
     rta_set_recursive_next_hop(p->p.main_channel->table, a, tab, r->via, IPA_NONE, r->mls);
   }
 
+  if (r->net->type == NET_ASPA)
+  {
+    if (r->dest != RTD_NONE)
+    {
+      log(L_WARN "%s: ASPA %u configured with nexthop, ignoring the nexthop",
+	p->p.name, ((struct net_addr_aspa *) r->net)->asn);
+      r->dest = RTD_NONE;
+    }
+
+    if (!r->aspa)
+    {
+      log(L_WARN "%s: ASPA %u configured with no provider list, ignoring the whole rule",
+	p->p.name, ((struct net_addr_aspa *) r->net)->asn);
+      goto withdraw;
+    }
+
+    ea_list *ea = alloca(sizeof(ea_list) + sizeof(eattr));
+    *ea = (ea_list) { .flags = EALF_SORTED, .count = 1, .next = a->eattrs, };
+    ea->attrs[0] = (eattr) {
+      .id = EA_ASPA_PROVIDERS,
+      .type = EAF_TYPE_INT_SET,
+      .u.ptr = r->aspa,
+    };
+    a->eattrs = ea;
+  }
+
   if (p->p.mpls_channel)
   {
     struct mpls_channel *mc = (void *) p->p.mpls_channel;
diff --git a/proto/static/static.h b/proto/static/static.h
index a0a95a4b..edd2dc22 100644
--- a/proto/static/static.h
+++ b/proto/static/static.h
@@ -50,7 +50,10 @@ struct static_route {
   byte use_bfd;				/* Configured to use BFD */
   uint mpls_label;			/* Local MPLS label, -1 if unused */
   struct bfd_request *bfd_req;		/* BFD request, if BFD is used */
-  mpls_label_stack *mls;		/* MPLS label stack; may be NULL */
+  union {
+    mpls_label_stack *mls;		/* MPLS label stack; may be NULL */
+    adata *aspa;			/* ASPA provider list; may be NULL */
+  };
 };
 
 /*
-- 
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