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-rw-r--r--src/vnet/lisp-gpe/lisp_gpe_tunnel.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/src/vnet/lisp-gpe/lisp_gpe_tunnel.c b/src/vnet/lisp-gpe/lisp_gpe_tunnel.c
new file mode 100644
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+++ b/src/vnet/lisp-gpe/lisp_gpe_tunnel.c
@@ -0,0 +1,293 @@
+/*
+ * Copyright (c) 2016 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+/**
+ * @file
+ * @brief Common utility functions for IPv4, IPv6 and L2 LISP-GPE tunnels.
+ *
+ */
+#include <vnet/lisp-gpe/lisp_gpe.h>
+#include <vnet/lisp-gpe/lisp_gpe_tunnel.h>
+#include <vnet/lisp-gpe/lisp_gpe_adjacency.h>
+
+#include <vnet/fib/fib_table.h>
+
+/**
+ * @brief Pool of all LISP tunnels
+ */
+static lisp_gpe_tunnel_t *lisp_gpe_tunnel_pool;
+
+/**
+ * @brief a DB of all tunnels
+ */
+static uword *lisp_gpe_tunnel_db;
+
+/**
+ * @brief Compute IP-UDP-GPE sub-tunnel encap/rewrite header.
+ *
+ * @param[in] t Parent of the sub-tunnel.
+ * @param[in] st Sub-tunnel.
+ * @param[in] lp Local and remote locators used in the encap header.
+ *
+ * @return 0 on success.
+ */
+u8 *
+lisp_gpe_tunnel_build_rewrite (const lisp_gpe_tunnel_t * lgt,
+ const lisp_gpe_adjacency_t * ladj,
+ lisp_gpe_next_protocol_e payload_proto)
+{
+ lisp_gpe_header_t *lisp0;
+ u8 *rw = 0;
+ int len;
+ gpe_encap_mode_t encap_mode = vnet_gpe_get_encap_mode ();
+
+ if (IP4 == ip_addr_version (&lgt->key->lcl))
+ {
+ ip4_udp_lisp_gpe_header_t *h0;
+ ip4_header_t *ip0;
+
+ len = sizeof (*h0);
+
+ vec_validate_aligned (rw, len - 1, CLIB_CACHE_LINE_BYTES);
+
+ h0 = (ip4_udp_lisp_gpe_header_t *) rw;
+
+ /* Fixed portion of the (outer) ip4 header */
+ ip0 = &h0->ip4;
+ ip0->ip_version_and_header_length = 0x45;
+ ip0->ttl = 254;
+ ip0->protocol = IP_PROTOCOL_UDP;
+
+ /* we fix up the ip4 header length and checksum after-the-fact */
+ ip_address_copy_addr (&ip0->src_address, &lgt->key->lcl);
+ ip_address_copy_addr (&ip0->dst_address, &lgt->key->rmt);
+ ip0->checksum = ip4_header_checksum (ip0);
+
+ /* UDP header, randomize src port on something, maybe? */
+ h0->udp.src_port = clib_host_to_net_u16 (4341);
+ h0->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_lisp_gpe);
+
+ /* LISP-gpe header */
+ lisp0 = &h0->lisp;
+ }
+ else
+ {
+ ip6_udp_lisp_gpe_header_t *h0;
+ ip6_header_t *ip0;
+
+ len = sizeof (*h0);
+
+ vec_validate_aligned (rw, len - 1, CLIB_CACHE_LINE_BYTES);
+
+ h0 = (ip6_udp_lisp_gpe_header_t *) rw;
+
+ /* Fixed portion of the (outer) ip6 header */
+ ip0 = &h0->ip6;
+ ip0->ip_version_traffic_class_and_flow_label =
+ clib_host_to_net_u32 (0x6 << 28);
+ ip0->hop_limit = 254;
+ ip0->protocol = IP_PROTOCOL_UDP;
+
+ /* we fix up the ip6 header length after-the-fact */
+ ip_address_copy_addr (&ip0->src_address, &lgt->key->lcl);
+ ip_address_copy_addr (&ip0->dst_address, &lgt->key->rmt);
+
+ /* UDP header, randomize src port on something, maybe? */
+ h0->udp.src_port = clib_host_to_net_u16 (4341);
+ h0->udp.dst_port = clib_host_to_net_u16 (UDP_DST_PORT_lisp_gpe);
+
+ /* LISP-gpe header */
+ lisp0 = &h0->lisp;
+ }
+
+ lisp0->flags = ladj->flags;
+ if (GPE_ENCAP_VXLAN == encap_mode)
+ /* unset P flag */
+ lisp0->flags &= ~LISP_GPE_FLAGS_P;
+
+ lisp0->ver_res = 0;
+ lisp0->res = 0;
+ lisp0->next_protocol = payload_proto;
+ lisp0->iid = clib_host_to_net_u32 (ladj->vni) >> 8; /* first 24 bits only */
+
+ return (rw);
+}
+
+static lisp_gpe_tunnel_t *
+lisp_gpe_tunnel_db_find (const lisp_gpe_tunnel_key_t * key)
+{
+ uword *p;
+
+ p = hash_get_mem (lisp_gpe_tunnel_db, (void *) key);
+
+ if (NULL != p)
+ {
+ return (pool_elt_at_index (lisp_gpe_tunnel_pool, p[0]));
+ }
+ return (NULL);
+}
+
+lisp_gpe_tunnel_t *
+lisp_gpe_tunnel_get_i (index_t lgti)
+{
+ return (pool_elt_at_index (lisp_gpe_tunnel_pool, lgti));
+}
+
+index_t
+lisp_gpe_tunnel_find_or_create_and_lock (const locator_pair_t * pair,
+ u32 rloc_fib_index)
+{
+ lisp_gpe_tunnel_key_t key = {
+ .lcl = pair->lcl_loc,
+ .rmt = pair->rmt_loc,
+ .fib_index = rloc_fib_index,
+ };
+ lisp_gpe_tunnel_t *lgt;
+ fib_prefix_t pfx;
+
+ lgt = lisp_gpe_tunnel_db_find (&key);
+
+ if (NULL == lgt)
+ {
+ pool_get (lisp_gpe_tunnel_pool, lgt);
+ memset (lgt, 0, sizeof (*lgt));
+
+ lgt->key = clib_mem_alloc (sizeof (*lgt->key));
+ memset (lgt->key, 0, sizeof (*lgt->key));
+
+ lgt->key->rmt = pair->rmt_loc;
+ lgt->key->lcl = pair->lcl_loc;
+ lgt->key->fib_index = rloc_fib_index;
+
+ /*
+ * source the FIB entry for the RLOC so we can track its forwarding
+ * chain
+ */
+ ip_address_to_fib_prefix (&lgt->key->rmt, &pfx);
+
+ lgt->fib_entry_index = fib_table_entry_special_add (rloc_fib_index,
+ &pfx,
+ FIB_SOURCE_RR,
+ FIB_ENTRY_FLAG_NONE);
+
+ hash_set_mem (lisp_gpe_tunnel_db, &lgt->key,
+ (lgt - lisp_gpe_tunnel_pool));
+ }
+
+ lgt->locks++;
+
+ return (lgt - lisp_gpe_tunnel_pool);
+}
+
+void
+lisp_gpe_tunnel_unlock (index_t lgti)
+{
+ lisp_gpe_tunnel_t *lgt;
+
+ lgt = lisp_gpe_tunnel_get_i (lgti);
+ lgt->locks--;
+
+ if (0 == lgt->locks)
+ {
+ hash_unset_mem (lisp_gpe_tunnel_db, &lgt->key);
+ clib_mem_free (lgt->key);
+ pool_put (lisp_gpe_tunnel_pool, lgt);
+ }
+}
+
+const lisp_gpe_tunnel_t *
+lisp_gpe_tunnel_get (index_t lgti)
+{
+ return (lisp_gpe_tunnel_get_i (lgti));
+}
+
+/** Format LISP-GPE tunnel. */
+u8 *
+format_lisp_gpe_tunnel (u8 * s, va_list * args)
+{
+ lisp_gpe_tunnel_t *lgt = va_arg (*args, lisp_gpe_tunnel_t *);
+
+ s = format (s, "tunnel %d\n", lgt - lisp_gpe_tunnel_pool);
+ s = format (s, " fib-index: %d, locks:%d \n",
+ lgt->key->fib_index, lgt->locks);
+ s = format (s, " lisp ver 0\n");
+
+ s = format (s, " locator-pair:\n");
+ s = format (s, " local: %U remote: %U\n",
+ format_ip_address, &lgt->key->lcl,
+ format_ip_address, &lgt->key->rmt);
+ s = format (s, " RLOC FIB entry: %d\n", lgt->fib_entry_index);
+
+ return s;
+}
+
+/**
+ * CLI command to show LISP-GPE tunnels.
+ */
+static clib_error_t *
+show_lisp_gpe_tunnel_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ lisp_gpe_tunnel_t *lgt;
+ index_t index;
+
+ if (pool_elts (lisp_gpe_tunnel_pool) == 0)
+ vlib_cli_output (vm, "No lisp-gpe tunnels configured...");
+
+ if (unformat (input, "%d", &index))
+ {
+ lgt = lisp_gpe_tunnel_get_i (index);
+ vlib_cli_output (vm, "%U", format_lisp_gpe_tunnel, lgt);
+ }
+ else
+ {
+ /* *INDENT-OFF* */
+ pool_foreach (lgt, lisp_gpe_tunnel_pool,
+ ({
+ vlib_cli_output (vm, "%U", format_lisp_gpe_tunnel, lgt);
+ }));
+ /* *INDENT-ON* */
+ }
+
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_lisp_gpe_tunnel_command, static) =
+{
+ .path = "show gpe tunnel",
+ .function = show_lisp_gpe_tunnel_command_fn,
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+lisp_gpe_tunnel_module_init (vlib_main_t * vm)
+{
+ lisp_gpe_tunnel_db = hash_create_mem (0,
+ sizeof (lisp_gpe_tunnel_key_t),
+ sizeof (uword));
+
+ return (NULL);
+}
+
+VLIB_INIT_FUNCTION (lisp_gpe_tunnel_module_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */