Wireguard: Initial commit

4 files changed, 421 insertions, 0 deletions

diff --git a/proto/wireguard/Makefile b/proto/wireguard/Makefile
new file mode 100644
index 00000000..26a7970f
--- /dev/null
+++ b/proto/wireguard/Makefile
@@ -0,0 +1,8 @@
+WG := $(srcdir)/../WireGuard/contrib/examples/embeddable-wg-library
+
+src := wireguard.c
+obj := $(src-o-files)
+$(all-daemon)
+$(cf-local)
+
+tests_objs := $(tests_objs) $(src-o-files)
diff --git a/proto/wireguard/config.Y b/proto/wireguard/config.Y
new file mode 100644
index 00000000..dfe621bd
--- /dev/null
+++ b/proto/wireguard/config.Y
@@ -0,0 +1,48 @@
+/*
+ *	BIRD -- Wireguard Protocol Configuration
+ *
+ *	(c) 1999 Martin Mares <mj@ucw.cz>
+ *
+ *	Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+CF_HDR
+
+#include "proto/wireguard/wireguard.h"
+
+CF_DEFINES
+
+#define WG_CFG ((struct wg_config *) this_proto)
+
+CF_DECLS
+
+CF_KEYWORDS(WIREGUARD, PEERS)
+
+CF_GRAMMAR
+
+proto: wireguard_proto '}' ;
+
+wireguard_proto_start: proto_start WIREGUARD {
+     this_proto = proto_config_new(&proto_wireguard, $1);
+  }
+ ;
+
+wireguard_proto:
+   wireguard_proto_start proto_name '{'
+ | wireguard_proto proto_channel ';' { this_proto->net_type = $2->net_type; }
+ | wireguard_proto proto_item ';'
+ | wireguard_proto INTERFACE TEXT ';' { WG_CFG->ifname = $3; }
+ | wireguard_proto PEERS '{' peers '}'
+ ;
+
+peers:
+ /* empty */
+ | peers peer
+
+peer: ipa pubkey ';'
+
+pubkey: TEXT
+
+CF_CODE
+
+CF_END
diff --git a/proto/wireguard/wireguard.c b/proto/wireguard/wireguard.c
new file mode 100644
index 00000000..cdc50317
--- /dev/null
+++ b/proto/wireguard/wireguard.c
@@ -0,0 +1,343 @@
+// Based on proto/rip/rip.c
+
+#include <stdio.h>
+#include <stdlib.h>
+#include "nest/protocol.h"
+#include "nest/iface.h"
+#include "sysdep/linux/wireguard.h"
+#include "wireguard.h"
+#include "proto/bgp/bgp.h"
+
+static void
+wg_init_entry(void *e_)
+{
+  struct wg_entry *e UNUSED = e_;
+//  debug("wg_init_entry\n");
+}
+
+static void
+wg_postconfig(struct proto_config *C UNUSED)
+{
+  debug("postconfig\n");
+}
+
+static void
+wg_if_notify(struct proto *P, unsigned flags, struct iface *i)
+{
+  struct wg_proto *p = (struct wg_proto *) P;
+  struct wg_config *c = (struct wg_config *) P->cf;
+
+  debug("WG: if_notify %p %s %d %s\n", i, i->name, flags, c->ifname);
+  if (c->ifname && !strcmp(i->name, c->ifname)) {
+    debug("WG: found ifname\n");
+    p->iface = i;
+  }
+}
+
+static void
+wg_rt_notify(struct proto *P, struct channel *ch UNUSED, struct network *n,
+  struct rte *new, struct rte *old UNUSED)
+{
+  struct wg_proto *p = (struct wg_proto *) P;
+  struct wg_config *c = (struct wg_config *) P->cf;
+  struct wg_entry *en;
+  struct iface *iface = NULL;
+  const char *ifname = NULL;
+
+//  debug("WG: notify\n");
+
+  if (new) {
+    iface = new->attrs->nh.iface;
+    ifname = iface ? iface->name : NULL;
+
+    if (iface && iface == p->iface) {
+      struct eattr *t;
+
+      debug("WG: found iface\n");
+      en = fib_get(&p->rtable, n->n.addr);
+
+      debug("WG: notify new %d %N\n",
+        new->attrs->dest, n->n.addr);
+
+      t = ea_find(new->attrs->eattrs, EA_CODE(PROTOCOL_BGP, BA_TUNNEL_ENCAP));
+      if (t && t->u.ptr) {
+	log(L_TRACE "WG:     Attr %x %x %d", t->flags, t->type, t->u.ptr->length);
+
+	struct wg_device *dev = NULL;
+
+	if (wg_get_device(&dev, ifname) == 0) {
+	  bool found = false;
+	  struct wg_peer *peer = NULL;
+	  wg_for_each_peer(dev, peer) {
+	    // Look for public key
+	    size_t len = 32; // FIXME
+	    // MIN(32, t->u.ptr->length)
+	    if (memcmp(peer->public_key, &t->u.ptr->data[t->u.ptr->length - 32], len) != 0) {
+	      log(L_TRACE "WG:     Not found");
+	      continue;
+	    }
+
+	    log(L_TRACE "WG:     Found");
+	    found = true;
+
+	    if (found) {
+	      // Add allowed ip
+	      struct wg_allowedip *allowedip = malloc(sizeof(struct wg_allowedip));
+	      memset(allowedip, 0, sizeof(struct wg_allowedip));
+
+	      if (p->p.cf->net_type == NET_IP4) {
+		allowedip->family = AF_INET;
+		allowedip->ip4.s_addr = ip4_to_u32(ip4_hton(net4_prefix(n->n.addr)));
+	      } else if (p->p.cf->net_type == NET_IP6) {
+		allowedip->family = AF_INET6;
+		ip6_addr addr = ip6_hton(net6_prefix(n->n.addr));
+		memcpy(allowedip->ip6.s6_addr, &addr, 16);
+	      }
+	      
+	      allowedip->cidr = net_pxlen(n->n.addr);
+	      peer->last_allowedip->next_allowedip = allowedip;
+	      peer->last_allowedip = allowedip;
+
+	      int res = wg_set_device(dev);
+	      log(L_TRACE "WG: wg_set_device %d", res);
+	      break;
+	    }
+	  }
+
+	  wg_free_device(dev);
+	  dev = NULL;
+	}
+
+	
+/*
+	struct sub_tlv_remove_endpoint {
+		u32 asn;
+		u8 address_family;
+		union {
+			ip4_addr ip4;
+			ip6_addr ip6;
+		};
+	};
+
+	struct sub_tlv_udp_dest_port {
+		u16 port;
+	};
+
+	struct sub_tlv_wireguard {
+		u8 pubkey[32];
+	};
+
+	struct sub_tlv {
+		u8 type;
+		union {
+			struct {
+				u8 length;
+				struct sub_tlv_value value[];
+			} s8;
+			struct {
+				u16 length;
+				struct sub_tlv_value value[];
+			} s16;
+		} u;
+	};
+
+	struct bgp_tunnel_encap_attr {
+		u16 type;
+		u16 length;
+		struct sub_tlv stlv[];
+	};
+*/
+      } else {
+        log(L_TRACE "WG:     No Attr");
+      }
+
+  //  old_metric = en->valid ? en->metric : -1;
+
+//  en->valid = RIP_ENTRY_VALID;
+//  en->metric = rt_metric;
+//  en->tag = rt_tag;
+//  en->from = (new->attrs->src->proto == P) ? new->u.rip.from : NULL;
+//  en->iface = new->attrs->iface;
+//  en->next_hop = new->attrs->gw;
+      }
+
+  } else {
+    debug("WG: notify withdraw %N\n",
+	  n->n.addr);
+
+    /* Withdraw */
+    en = fib_find(&p->rtable, n->n.addr);
+
+    if (!en) // || en->valid != RIP_ENTRY_VALID)
+      return;
+
+	struct wg_device *dev = NULL;
+
+	if (wg_get_device(&dev, c->ifname) == 0) {
+	  bool found = false;
+	  struct wg_peer *peer = NULL;
+	  wg_for_each_peer(dev, peer) {
+	    // Remove from all peers
+	    found = true;
+
+	    if (found) {
+	      // Add allowed ip
+	      struct wg_allowedip *allowedip = malloc(sizeof(struct wg_allowedip));
+	      memset(allowedip, 0, sizeof(struct wg_allowedip));
+
+	      if (p->p.cf->net_type == NET_IP4) {
+		allowedip->family = AF_INET;
+		allowedip->ip4.s_addr = ip4_to_u32(ip4_hton(net4_prefix(n->n.addr)));
+	      } else if (p->p.cf->net_type == NET_IP6) {
+		allowedip->family = AF_INET6;
+		ip6_addr addr = ip6_hton(net6_prefix(n->n.addr));
+		memcpy(allowedip->ip6.s6_addr, &addr, 16);
+	      }
+
+	      allowedip->cidr = net_pxlen(n->n.addr);
+
+	      struct wg_allowedip *ip = NULL;
+	      struct wg_allowedip *previp = NULL;
+	      
+	      wg_for_each_allowedip(peer, ip) {
+		if (allowedip->family != ip->family) {
+		  previp = ip;
+		  continue;
+		}
+
+		if (allowedip->cidr != ip->cidr) {
+		  previp = ip;
+		  continue;
+		}
+		
+		if (memcmp(&allowedip->ip6, &ip->ip6, sizeof(struct in6_addr))) {
+		  previp = ip;
+		  continue;
+		}
+
+		debug("WG: found ip\n");
+
+		if (!previp) {
+		  debug("WG: remove first\n");
+		  peer->first_allowedip = ip->next_allowedip;
+		  if (peer->last_allowedip == ip)
+		    peer->last_allowedip = NULL;
+		} else {
+		  debug("WG: remove middle\n");
+		  // Remove
+		  if (peer->last_allowedip == ip)
+		      peer->last_allowedip = previp;
+
+		  previp->next_allowedip = ip->next_allowedip;
+		}
+
+		free(ip);
+		break;
+	      }
+	      
+	      peer->flags |= WGPEER_REPLACE_ALLOWEDIPS;
+	      int res = wg_set_device(dev);
+	      log(L_TRACE "WG: wg_set_device %d", res);
+	    }
+	  }
+
+	  wg_free_device(dev);
+	  dev = NULL;
+
+	  /*
+    old_metric = en->metric;
+
+    en->valid = RIP_ENTRY_STALE;
+    en->metric = p->infinity;
+    en->tag = 0;
+    en->from = NULL;
+    en->iface = NULL;
+    en->next_hop = IPA_NONE;
+*/
+	}
+  }
+
+//  TRACE(D_EVENTS, "wg notify %s %s", src_table->name, ifname?ifname:"(null)");
+}
+
+static void
+wg_reload_routes(struct channel *C)
+{
+  struct wg_proto *p UNUSED = (struct wg_proto *) C->proto;
+
+  debug("reload routes\n");
+
+// TODO
+//  WALK_LIST(c, p->channels)
+//    channel_request_feeding(c);
+}
+
+
+static struct proto *
+wg_init(struct proto_config *C)
+{
+  struct wg_config *c UNUSED = (struct wg_config *) C;
+  struct proto *P = proto_new(C);
+  struct wg_proto *p UNUSED = (struct wg_proto *) P;
+
+  debug("init\n");
+
+  P->main_channel = proto_add_channel(P, proto_cf_main_channel(C));
+
+  P->if_notify = wg_if_notify;
+  P->rt_notify = wg_rt_notify;
+  P->reload_routes = wg_reload_routes;
+//  P->accept_ra_types = RA_ANY;
+
+  return P;
+}
+
+
+static int
+wg_start(struct proto *P)
+{
+  struct wg_config *cf UNUSED = (struct wg_config *) P->cf;
+  struct wg_proto *p = (struct wg_proto *) P;
+
+  debug("start\n");
+  fib_init(&p->rtable, P->pool, P->net_type, sizeof(struct wg_entry),
+	 OFFSETOF(struct wg_entry, n), 0, wg_init_entry);
+  return PS_UP;
+}
+
+static void
+wg_dump(struct proto *P)
+{
+  struct wg_proto *p = (struct wg_proto *) P;
+  int i;
+
+  i = 0;
+  FIB_WALK(&p->rtable, struct wg_entry, en)
+  {
+//    struct wg_entry *en = (struct wg_entry *) e;
+    debug("WG: entry #%d:\n",
+          i++);
+  }
+  FIB_WALK_END;
+}
+
+
+struct protocol proto_wireguard = {
+  .name =		"Wireguard",
+  .template =		"wg%d",
+  .class =              PROTOCOL_WG,
+  .channel_mask =       NB_ANY,
+  .proto_size =         sizeof(struct wg_proto),
+  .config_size =	sizeof(struct wg_config),
+  .postconfig =		wg_postconfig,
+  .init =		wg_init,
+  .start =		wg_start,
+  .dump = 		wg_dump,
+/*  .multitable =		1,
+  .preference =		DEF_PREF_PIPE,
+  .cleanup =		wg_cleanup,
+  .reconfigure =	wg_reconfigure,
+  .copy_config = 	wg_copy_config,
+  .get_status = 	wg_get_status,
+  .show_proto_info = 	wg_show_proto_info*/
+};
diff --git a/proto/wireguard/wireguard.h b/proto/wireguard/wireguard.h
new file mode 100644
index 00000000..992bb12b
--- /dev/null
+++ b/proto/wireguard/wireguard.h
@@ -0,0 +1,22 @@
+#ifndef _BIRD_WIREGUARD_H
+#define _BIRD_WIREGUARD_H
+
+#include "nest/protocol.h"
+
+struct wg_config {
+  struct proto_config c;
+  const char *ifname;
+};
+
+struct wg_proto {
+  struct proto p;
+  struct fib rtable;
+  struct iface *iface;
+};
+
+struct wg_entry {
+  struct fib_node n;
+};
+
+
+#endif /* _BIRD_WIREGUARD_H */