Added mpls_output() used to output mpls packets originating from local host.

Strictly similar to mpls_input().

Input and OK claudio@, OK laurent@

1 files changed, 153 insertions, 0 deletions

diff --git a/sys/netmpls/mpls_output.c b/sys/netmpls/mpls_output.c
new file mode 100644
index 00000000000..3139918be0d
--- /dev/null
+++ b/sys/netmpls/mpls_output.c
@@ -0,0 +1,153 @@
+/* $Id: mpls_output.c,v 1.1 2008/10/28 01:16:14 michele Exp $ */
+
+/*
+ * Copyright (c) 2008 Claudio Jeker <claudio@openbsd.org>
+ * Copyright (c) 2008 Michele Marchetto <michele@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/param.h>
+#include <sys/mbuf.h>
+#include <sys/systm.h>
+#include <sys/socket.h>
+
+#include <net/if.h>
+#include <net/route.h>
+
+#include <netmpls/mpls.h>
+
+extern int	mpls_inkloop;
+
+#ifdef MPLS_DEBUG
+#define MPLS_LABEL_GET(l)	((ntohl((l) & MPLS_LABEL_MASK)) >> MPLS_LABEL_OFFSET)
+#endif
+
+void
+mpls_output(struct mbuf *m)
+{
+	struct ifnet		*ifp = m->m_pkthdr.rcvif;
+	struct sockaddr_mpls	*smpls;
+	struct sockaddr_mpls	 sa_mpls;
+	struct shim_hdr		*shim;
+	struct rtentry		*rt = NULL;
+	u_int32_t		 ttl;
+	int			 i;
+
+	if (!mpls_enable) {
+		m_freem(m);
+		return;
+	}
+
+	/* reset broadcast and multicast flags, this is a P2P tunnel */
+	m->m_flags &= ~(M_BCAST | M_MCAST);
+
+	if (m->m_len < sizeof(*shim))
+		if ((m = m_pullup(m, sizeof(*shim))) == NULL)
+			return;
+
+	shim = mtod(m, struct shim_hdr *);
+
+	/* extract TTL */
+	ttl = shim->shim_label & MPLS_TTL_MASK;
+
+	for (i = 0; i < mpls_inkloop; i++) {
+		bzero(&sa_mpls, sizeof(sa_mpls));
+		smpls = &sa_mpls;
+		smpls->smpls_family = AF_MPLS;
+		smpls->smpls_len = sizeof(*smpls);
+		smpls->smpls_in_ifindex = ifp->if_index;
+		smpls->smpls_in_label = shim->shim_label & MPLS_LABEL_MASK;
+
+#ifdef MPLS_DEBUG
+		printf("smpls af %d len %d in_label %d in_ifindex %d\n",
+		    smpls->smpls_family, smpls->smpls_len,
+		    MPLS_LABEL_GET(smpls->smpls_in_label),
+		    smpls->smpls_in_ifindex);
+#endif
+
+		rt = rtalloc1(smplstosa(smpls), 1, 0);
+
+		if (rt == NULL) {
+			/* no entry for this label */
+#ifdef MPLS_DEBUG
+			printf("MPLS_DEBUG: label not found\n");
+#endif
+			m_freem(m);
+			goto done;
+		}
+
+		rt->rt_use++;
+		smpls = satosmpls(rt_key(rt));
+
+#ifdef MPLS_DEBUG
+		printf("route af %d len %d in_label %d in_ifindex %d\n",
+		    smpls->smpls_family, smpls->smpls_len,
+		    MPLS_LABEL_GET(smpls->smpls_in_label),
+		    smpls->smpls_in_ifindex);
+		printf("\top %d out_label %d out_ifindex %d\n",
+		    smpls->smpls_operation,
+		    MPLS_LABEL_GET(smpls->smpls_out_label),
+		    smpls->smpls_out_ifindex);
+#endif
+
+		switch (smpls->smpls_operation) {
+		case MPLS_OP_POP:
+			if (MPLS_BOS_ISSET(shim->shim_label)) {
+				/* drop to avoid loops */
+				m_freem(m);
+				goto done;
+			}
+
+			m = mpls_shim_pop(m);
+			break;
+		case MPLS_OP_PUSH:
+			m = mpls_shim_push(m, smpls);
+			break;
+		case MPLS_OP_SWAP:
+			m = mpls_shim_swap(m, smpls);
+			break;
+		default:
+			m_freem(m);
+			goto done;
+		}
+
+		if (m == NULL)
+			goto done;
+
+		/* refetch label */
+		shim = mtod(m, struct shim_hdr *);
+		ifp = rt->rt_ifp;
+
+		if (smpls->smpls_out_ifindex)
+			break;
+
+		RTFREE(rt);
+		rt = NULL;
+	}
+
+	/* write back TTL */
+	shim->shim_label = (shim->shim_label & ~MPLS_TTL_MASK) | ttl;
+
+#ifdef MPLS_DEBUG
+	printf("MPLS: sending on %s outlabel %x dst af %d in %d out %d\n",
+	    ifp->if_xname, ntohl(shim->shim_label), smpls->smpls_family,
+	    MPLS_LABEL_GET(smpls->smpls_in_label),
+	    MPLS_LABEL_GET(smpls->smpls_out_label));
+#endif
+
+	(*ifp->if_output)(ifp, m, smplstosa(smpls), rt);
+done:
+	if (rt)
+		RTFREE(rt);
+}