--- /dev/null
+/*
+ * Copyright (c) 2015 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.
+ */
+#include <vnet/l2/l2_xcrw.h>
+
+/**
+ * @file
+ * General L2 / L3 cross-connect, used to set up
+ * "L2 interface <--> your-favorite-tunnel-encap" tunnels.
+ *
+ * We set up a typical L2 cross-connect or (future) bridge
+ * to hook L2 interface(s) up to the L3 stack in arbitrary ways.
+ *
+ * Each l2_xcrw adjacency specifies 3 things:
+ *
+ * 1. The next graph node (presumably in the L3 stack) to
+ * process the (L2 -> L3) packet
+ *
+ * 2. A new value for vnet_buffer(b)->sw_if_index[VLIB_TX]
+ * (i.e. a lookup FIB index),
+ *
+ * 3. A rewrite string to apply.
+ *
+ * Example: to cross-connect an L2 interface or (future) bridge
+ * to an mpls-o-gre tunnel, set up the L2 rewrite string as shown in
+ * mpls_gre_rewrite, and use "mpls-post-rewrite" to fix the
+ * GRE IP header checksum and length fields.
+ */
+
+typedef struct
+{
+ u32 next_index;
+ u32 tx_fib_index;
+} l2_xcrw_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_l2_xcrw_trace (u8 * s, va_list * args)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *);
+ l2_xcrw_trace_t *t = va_arg (*args, l2_xcrw_trace_t *);
+
+ s = format (s, "L2_XCRW: next index %d tx_fib_index %d",
+ t->next_index, t->tx_fib_index);
+ return s;
+}
+
+l2_xcrw_main_t l2_xcrw_main;
+
+static vlib_node_registration_t l2_xcrw_node;
+
+static char *l2_xcrw_error_strings[] = {
+#define _(sym,string) string,
+ foreach_l2_xcrw_error
+#undef _
+};
+
+static uword
+l2_xcrw_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ u32 n_left_from, *from, *to_next;
+ l2_xcrw_next_t next_index;
+ l2_xcrw_main_t *xcm = &l2_xcrw_main;
+ vlib_node_t *n = vlib_get_node (vm, l2_xcrw_node.index);
+ u32 node_counter_base_index = n->error_heap_index;
+ vlib_error_main_t *em = &vm->error_main;
+
+ from = vlib_frame_vector_args (frame);
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ u32 n_left_to_next;
+
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from >= 4 && n_left_to_next >= 2)
+ {
+ u32 bi0, bi1;
+ vlib_buffer_t *b0, *b1;
+ u32 next0, next1;
+ u32 sw_if_index0, sw_if_index1;
+ l2_xcrw_adjacency_t *adj0, *adj1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_buffer_t *p2, *p3;
+
+ p2 = vlib_get_buffer (vm, from[2]);
+ p3 = vlib_get_buffer (vm, from[3]);
+
+ vlib_prefetch_buffer_header (p2, LOAD);
+ vlib_prefetch_buffer_header (p3, LOAD);
+
+ CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE);
+ CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE);
+ }
+
+ /* speculatively enqueue b0 and b1 to the current next frame */
+ to_next[0] = bi0 = from[0];
+ to_next[1] = bi1 = from[1];
+ from += 2;
+ to_next += 2;
+ n_left_from -= 2;
+ n_left_to_next -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+ sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX];
+
+ adj0 = vec_elt_at_index (xcm->adj_by_sw_if_index, sw_if_index0);
+ adj1 = vec_elt_at_index (xcm->adj_by_sw_if_index, sw_if_index1);
+
+ next0 = adj0->rewrite_header.next_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] =
+ adj0->rewrite_header.sw_if_index;
+
+ next1 = adj1->rewrite_header.next_index;
+ vnet_buffer (b1)->sw_if_index[VLIB_TX] =
+ adj1->rewrite_header.sw_if_index;
+
+ em->counters[node_counter_base_index + next1]++;
+
+ if (PREDICT_TRUE (next0 > 0))
+ {
+ u8 *h0 = vlib_buffer_get_current (b0);
+ vnet_rewrite_one_header (adj0[0], h0,
+ adj0->rewrite_header.data_bytes);
+ vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
+ em->counters[node_counter_base_index + L2_XCRW_ERROR_FWD]++;
+ }
+
+ if (PREDICT_TRUE (next1 > 0))
+ {
+ u8 *h1 = vlib_buffer_get_current (b1);
+ vnet_rewrite_one_header (adj1[0], h1,
+ adj1->rewrite_header.data_bytes);
+ vlib_buffer_advance (b1, -adj1->rewrite_header.data_bytes);
+ em->counters[node_counter_base_index + L2_XCRW_ERROR_FWD]++;
+ }
+
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)))
+ {
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2_xcrw_trace_t *t =
+ vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->next_index = next0;
+ t->tx_fib_index = adj0->rewrite_header.sw_if_index;
+ }
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b1->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2_xcrw_trace_t *t =
+ vlib_add_trace (vm, node, b1, sizeof (*t));
+ t->next_index = next1;
+ t->tx_fib_index = adj1->rewrite_header.sw_if_index;
+ }
+ }
+
+ /* verify speculative enqueues, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x2 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, bi1, next0, next1);
+ }
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ u32 bi0;
+ vlib_buffer_t *b0;
+ u32 next0;
+ u32 sw_if_index0;
+ l2_xcrw_adjacency_t *adj0;
+
+ /* speculatively enqueue b0 to the current next frame */
+ bi0 = from[0];
+ to_next[0] = bi0;
+ from += 1;
+ to_next += 1;
+ n_left_from -= 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+
+ sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
+
+ adj0 = vec_elt_at_index (xcm->adj_by_sw_if_index, sw_if_index0);
+
+ next0 = adj0->rewrite_header.next_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] =
+ adj0->rewrite_header.sw_if_index;
+
+ if (PREDICT_TRUE (next0 > 0))
+ {
+ u8 *h0 = vlib_buffer_get_current (b0);
+ vnet_rewrite_one_header (adj0[0], h0,
+ adj0->rewrite_header.data_bytes);
+ vlib_buffer_advance (b0, -adj0->rewrite_header.data_bytes);
+ em->counters[node_counter_base_index + L2_XCRW_ERROR_FWD]++;
+ }
+
+ if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
+ && (b0->flags & VLIB_BUFFER_IS_TRACED)))
+ {
+ l2_xcrw_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t));
+ t->next_index = next0;
+ t->tx_fib_index = adj0->rewrite_header.sw_if_index;
+ }
+
+ /* verify speculative enqueue, maybe switch current next frame */
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ bi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (l2_xcrw_node, static) = {
+ .function = l2_xcrw_node_fn,
+ .name = "l2-xcrw",
+ .vector_size = sizeof (u32),
+ .format_trace = format_l2_xcrw_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(l2_xcrw_error_strings),
+ .error_strings = l2_xcrw_error_strings,
+
+ .n_next_nodes = L2_XCRW_N_NEXT,
+
+ /* edit / add dispositions here */
+ .next_nodes = {
+ [L2_XCRW_NEXT_DROP] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (l2_xcrw_node, l2_xcrw_node_fn)
+ clib_error_t *l2_xcrw_init (vlib_main_t * vm)
+{
+ l2_xcrw_main_t *mp = &l2_xcrw_main;
+
+ mp->vlib_main = vm;
+ mp->vnet_main = &vnet_main;
+ mp->tunnel_index_by_l2_sw_if_index = hash_create (0, sizeof (uword));
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (l2_xcrw_init);
+
+static uword
+dummy_interface_tx (vlib_main_t * vm,
+ vlib_node_runtime_t * node, vlib_frame_t * frame)
+{
+ clib_warning ("you shouldn't be here, leaking buffers...");
+ return frame->n_vectors;
+}
+
+static u8 *
+format_xcrw_name (u8 * s, va_list * args)
+{
+ u32 dev_instance = va_arg (*args, u32);
+ return format (s, "xcrw%d", dev_instance);
+}
+
+/* *INDENT-OFF* */
+VNET_DEVICE_CLASS (xcrw_device_class,static) = {
+ .name = "Xcrw",
+ .format_device_name = format_xcrw_name,
+ .tx_function = dummy_interface_tx,
+};
+/* *INDENT-ON* */
+
+/* Create a sham tunnel interface and return its sw_if_index */
+static u32
+create_xcrw_interface (vlib_main_t * vm)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ static u32 instance;
+ u8 address[6];
+ u32 hw_if_index;
+ vnet_hw_interface_t *hi;
+ u32 sw_if_index;
+
+ /* mac address doesn't really matter */
+ memset (address, 0, sizeof (address));
+ address[2] = 0x12;
+
+ /* can returns error iff phy != 0 */
+ (void) ethernet_register_interface
+ (vnm, xcrw_device_class.index, instance++, address, &hw_if_index,
+ /* flag change */ 0);
+
+ hi = vnet_get_hw_interface (vnm, hw_if_index);
+ sw_if_index = hi->sw_if_index;
+ vnet_sw_interface_set_flags (vnm, sw_if_index,
+ VNET_SW_INTERFACE_FLAG_ADMIN_UP);
+
+ /* Output to the sham tunnel invokes the encap node */
+ hi->output_node_index = l2_xcrw_node.index;
+
+ return sw_if_index;
+}
+
+int
+vnet_configure_l2_xcrw (vlib_main_t * vm, vnet_main_t * vnm,
+ u32 l2_sw_if_index, u32 tx_fib_index,
+ u8 * rewrite, u32 next_node_index, int is_add)
+{
+ l2_xcrw_main_t *xcm = &l2_xcrw_main;
+ l2_xcrw_adjacency_t *a;
+ l2_xcrw_tunnel_t *t;
+ uword *p;
+
+ if (is_add)
+ {
+
+ pool_get (xcm->tunnels, t);
+
+ /* No interface allocated? Do it. Otherwise, set admin up */
+ if (t->tunnel_sw_if_index == 0)
+ t->tunnel_sw_if_index = create_xcrw_interface (vm);
+ else
+ vnet_sw_interface_set_flags (vnm, t->tunnel_sw_if_index,
+ VNET_SW_INTERFACE_FLAG_ADMIN_UP);
+
+ t->l2_sw_if_index = l2_sw_if_index;
+
+ vec_validate (xcm->adj_by_sw_if_index, t->l2_sw_if_index);
+
+ a = vec_elt_at_index (xcm->adj_by_sw_if_index, t->l2_sw_if_index);
+ memset (a, 0, sizeof (*a));
+
+ a->rewrite_header.sw_if_index = tx_fib_index;
+
+ /*
+ * Add or find a dynamic disposition for the successor node,
+ * e.g. so we can ship pkts to mpls_post_rewrite...
+ */
+ a->rewrite_header.next_index =
+ vlib_node_add_next (vm, l2_xcrw_node.index, next_node_index);
+
+ if (vec_len (rewrite))
+ vnet_rewrite_set_data (a[0], rewrite, vec_len (rewrite));
+
+ set_int_l2_mode (vm, vnm, MODE_L2_XC, t->l2_sw_if_index, 0, 0, 0,
+ t->tunnel_sw_if_index);
+ hash_set (xcm->tunnel_index_by_l2_sw_if_index,
+ t->l2_sw_if_index, t - xcm->tunnels);
+ return 0;
+ }
+ else
+ {
+ p = hash_get (xcm->tunnel_index_by_l2_sw_if_index, l2_sw_if_index);
+ if (p == 0)
+ return VNET_API_ERROR_INVALID_SW_IF_INDEX;
+
+ t = pool_elt_at_index (xcm->tunnels, p[0]);
+
+ a = vec_elt_at_index (xcm->adj_by_sw_if_index, t->l2_sw_if_index);
+ /* Reset adj to drop traffic */
+ memset (a, 0, sizeof (*a));
+
+ set_int_l2_mode (vm, vnm, MODE_L3, t->l2_sw_if_index, 0, 0, 0, 0);
+
+ vnet_sw_interface_set_flags (vnm, t->tunnel_sw_if_index, 0 /* down */ );
+
+ hash_unset (xcm->tunnel_index_by_l2_sw_if_index, l2_sw_if_index);
+ pool_put (xcm->tunnels, t);
+ }
+ return 0;
+}
+
+
+static clib_error_t *
+set_l2_xcrw_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ unformat_input_t _line_input, *line_input = &_line_input;
+ int is_add = 1;
+ int is_ipv6 = 0; /* for fib id -> fib index mapping */
+ u32 tx_fib_id = ~0;
+ u32 tx_fib_index = ~0;
+ u32 next_node_index = ~0;
+ u32 l2_sw_if_index;
+ u8 *rw = 0;
+ vnet_main_t *vnm = vnet_get_main ();
+ int rv;
+
+
+ if (!unformat_user (input, unformat_line_input, line_input))
+ return 0;
+
+ if (!unformat (line_input, "%U",
+ unformat_vnet_sw_interface, vnm, &l2_sw_if_index))
+ return clib_error_return (0, "unknown input '%U'",
+ format_unformat_error, line_input);
+
+ while (unformat_check_input (line_input) != UNFORMAT_END_OF_INPUT)
+ {
+ if (unformat (line_input, "next %U",
+ unformat_vlib_node, vm, &next_node_index))
+ ;
+ else if (unformat (line_input, "tx-fib-id %d", &tx_fib_id))
+ ;
+ else if (unformat (line_input, "del"))
+ is_add = 0;
+ else if (unformat (line_input, "ipv6"))
+ is_ipv6 = 1;
+ else if (unformat (line_input, "rw %U", unformat_hex_string, &rw));
+ else
+ break;
+ }
+
+ if (next_node_index == ~0)
+ return clib_error_return (0, "next node not specified");
+
+ if (tx_fib_id != ~0)
+ {
+ uword *p;
+
+ if (is_ipv6)
+ p = hash_get (ip6_main.fib_index_by_table_id, tx_fib_id);
+ else
+ p = hash_get (ip4_main.fib_index_by_table_id, tx_fib_id);
+
+ if (p == 0)
+ return clib_error_return (0, "nonexistent tx_fib_id %d", tx_fib_id);
+
+ tx_fib_index = p[0];
+ }
+
+ rv = vnet_configure_l2_xcrw (vm, vnm, l2_sw_if_index, tx_fib_index,
+ rw, next_node_index, is_add);
+
+ switch (rv)
+ {
+
+ case 0:
+ break;
+
+ case VNET_API_ERROR_INVALID_SW_IF_INDEX:
+ return clib_error_return (0, "%U not cross-connected",
+ format_vnet_sw_if_index_name,
+ vnm, l2_sw_if_index);
+ default:
+ return clib_error_return (0, "vnet_configure_l2_xcrw returned %d", rv);
+ }
+
+ vec_free (rw);
+
+ return 0;
+}
+
+/*?
+ * Add or delete a Layer 2 to Layer 3 rewrite cross-connect. This is
+ * used to hook Layer 2 interface(s) up to the Layer 3 stack in
+ * arbitrary ways. For example, cross-connect an L2 interface or
+ * (future) bridge to an mpls-o-gre tunnel. Set up the L2 rewrite
+ * string as shown in mpls_gre_rewrite, and use \"mpls-post-rewrite\"
+ * to fix the GRE IP header checksum and length fields.
+ *
+ * @cliexpar
+ * @todo This is incomplete. This needs a detailed description and a
+ * practical example.
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (set_l2_xcrw_command, static) = {
+ .path = "set interface l2 xcrw",
+ .short_help =
+ "set interface l2 xcrw <interface> next <node-name>\n"
+ " [del] [tx-fib-id <id>] [ipv6] rw <hex-bytes>",
+ .function = set_l2_xcrw_command_fn,
+};
+/* *INDENT-ON* */
+
+static u8 *
+format_l2xcrw (u8 * s, va_list * args)
+{
+ vnet_main_t *vnm = va_arg (*args, vnet_main_t *);
+ l2_xcrw_tunnel_t *t = va_arg (*args, l2_xcrw_tunnel_t *);
+ l2_xcrw_main_t *xcm = &l2_xcrw_main;
+ vlib_main_t *vm = vlib_get_main ();
+ l2_xcrw_adjacency_t *a;
+ u8 *rewrite_string;
+
+ if (t == 0)
+ {
+ s = format (s, "%-25s%s", "L2 interface", "Tunnel Details");
+ return s;
+ }
+
+ s = format (s, "%-25U %U ",
+ format_vnet_sw_if_index_name, vnm, t->l2_sw_if_index,
+ format_vnet_sw_if_index_name, vnm, t->tunnel_sw_if_index);
+
+ a = vec_elt_at_index (xcm->adj_by_sw_if_index, t->l2_sw_if_index);
+
+ s = format (s, "next %U ",
+ format_vlib_next_node_name, vm, l2_xcrw_node.index,
+ a->rewrite_header.next_index);
+
+ if (a->rewrite_header.sw_if_index != ~0)
+ s = format (s, "tx fib index %d ", a->rewrite_header.sw_if_index);
+
+ if (a->rewrite_header.data_bytes)
+ {
+ rewrite_string = (u8 *) (a + 1);
+ rewrite_string -= a->rewrite_header.data_bytes;
+ s = format (s, "rewrite data: %U ",
+ format_hex_bytes, rewrite_string,
+ a->rewrite_header.data_bytes);
+ }
+
+ s = format (s, "\n");
+
+ return s;
+}
+
+
+static clib_error_t *
+show_l2xcrw_command_fn (vlib_main_t * vm,
+ unformat_input_t * input, vlib_cli_command_t * cmd)
+{
+ vnet_main_t *vnm = vnet_get_main ();
+ l2_xcrw_main_t *xcm = &l2_xcrw_main;
+ l2_xcrw_tunnel_t *t;
+
+ if (pool_elts (xcm->tunnels) == 0)
+ {
+ vlib_cli_output (vm, "No L2 / L3 rewrite cross-connects configured");
+ return 0;
+ }
+
+ vlib_cli_output (vm, "%U", format_l2xcrw, 0, 0);
+
+ /* *INDENT-OFF* */
+ pool_foreach (t, xcm->tunnels,
+ ({
+ vlib_cli_output (vm, "%U", format_l2xcrw, vnm, t);
+ }));
+ /* *INDENT-ON* */
+
+ return 0;
+}
+
+/*?
+ * Display a Layer 2 to Layer 3 rewrite cross-connect. This is used to
+ * hook Layer 2 interface(s) up to the Layer 3 stack in arbitrary ways.
+ *
+ * @todo This is incomplete. This needs a detailed description and a
+ * practical example.
+?*/
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (show_l2xcrw_command, static) = {
+ .path = "show l2xcrw",
+ .short_help = "show l2xcrw",
+ .function = show_l2xcrw_command_fn,
+};
+/* *INDENT-ON* */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff