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-rw-r--r--src/plugins/lisp/lisp-gpe/decap.c605
1 files changed, 605 insertions, 0 deletions
diff --git a/src/plugins/lisp/lisp-gpe/decap.c b/src/plugins/lisp/lisp-gpe/decap.c
new file mode 100644
index 00000000000..03e265ab739
--- /dev/null
+++ b/src/plugins/lisp/lisp-gpe/decap.c
@@ -0,0 +1,605 @@
+/*
+ * 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 L2 LISP-GPE decap code.
+ *
+ */
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <lisp/lisp-gpe/lisp_gpe.h>
+
+typedef struct
+{
+ u32 next_index;
+ u32 tunnel_index;
+ u32 error;
+ lisp_gpe_header_t h;
+} lisp_gpe_rx_trace_t;
+
+static u8 *
+format_lisp_gpe_rx_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 *);
+ lisp_gpe_rx_trace_t *t = va_arg (*args, lisp_gpe_rx_trace_t *);
+
+ if (t->tunnel_index != ~0)
+ {
+ s = format (s, "LISP-GPE: tunnel %d next %d error %d", t->tunnel_index,
+ t->next_index, t->error);
+ }
+ else
+ {
+ s = format (s, "LISP-GPE: no tunnel next %d error %d\n", t->next_index,
+ t->error);
+ }
+ s = format (s, "\n %U", format_lisp_gpe_header_with_length, &t->h,
+ (u32) sizeof (t->h) /* max size */ );
+ return s;
+}
+
+static u32 next_proto_to_next_index[LISP_GPE_NEXT_PROTOS] = {
+ LISP_GPE_INPUT_NEXT_DROP,
+ LISP_GPE_INPUT_NEXT_IP4_INPUT,
+ LISP_GPE_INPUT_NEXT_IP6_INPUT,
+ LISP_GPE_INPUT_NEXT_L2_INPUT,
+ LISP_GPE_INPUT_NEXT_DROP
+};
+
+always_inline u32
+next_protocol_to_next_index (lisp_gpe_header_t * lgh, u8 * next_header)
+{
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+
+ /* lisp-gpe router */
+ if (PREDICT_TRUE ((lgh->flags & LISP_GPE_FLAGS_P)
+ || GPE_ENCAP_VXLAN == lgm->encap_mode))
+ {
+ if (PREDICT_FALSE (lgh->next_protocol >= LISP_GPE_NEXT_PROTOS))
+ return LISP_GPE_INPUT_NEXT_DROP;
+
+ return next_proto_to_next_index[lgh->next_protocol];
+ }
+ /* legacy lisp router */
+ else if ((lgh->flags & LISP_GPE_FLAGS_P) == 0)
+ {
+ ip4_header_t *iph = (ip4_header_t *) next_header;
+ if ((iph->ip_version_and_header_length & 0xF0) == 0x40)
+ return LISP_GPE_INPUT_NEXT_IP4_INPUT;
+ else if ((iph->ip_version_and_header_length & 0xF0) == 0x60)
+ return LISP_GPE_INPUT_NEXT_IP6_INPUT;
+ else
+ return LISP_GPE_INPUT_NEXT_DROP;
+ }
+ else
+ return LISP_GPE_INPUT_NEXT_DROP;
+}
+
+always_inline tunnel_lookup_t *
+next_index_to_iface (lisp_gpe_main_t * lgm, u32 next_index)
+{
+ if (LISP_GPE_INPUT_NEXT_IP4_INPUT == next_index
+ || LISP_GPE_INPUT_NEXT_IP6_INPUT == next_index)
+ return &lgm->l3_ifaces;
+ else if (LISP_GPE_INPUT_NEXT_L2_INPUT == next_index)
+ return &lgm->l2_ifaces;
+ else if (LISP_GPE_INPUT_NEXT_NSH_INPUT == next_index)
+ return &lgm->nsh_ifaces;
+ clib_warning ("next_index not associated to an interface!");
+ return 0;
+}
+
+static_always_inline void
+incr_decap_stats (vnet_main_t * vnm, u32 thread_index, u32 length,
+ u32 sw_if_index, u32 * last_sw_if_index, u32 * n_packets,
+ u32 * n_bytes)
+{
+ vnet_interface_main_t *im;
+
+ if (PREDICT_TRUE (sw_if_index == *last_sw_if_index))
+ {
+ *n_packets += 1;
+ *n_bytes += length;
+ }
+ else
+ {
+ if (PREDICT_TRUE (*last_sw_if_index != ~0))
+ {
+ im = &vnm->interface_main;
+
+ vlib_increment_combined_counter (im->combined_sw_if_counters +
+ VNET_INTERFACE_COUNTER_RX,
+ thread_index, *last_sw_if_index,
+ *n_packets, *n_bytes);
+ }
+ *last_sw_if_index = sw_if_index;
+ *n_packets = 1;
+ *n_bytes = length;
+ }
+}
+
+/**
+ * @brief LISP-GPE decap dispatcher.
+ * @node lisp_gpe_input_inline
+ *
+ * LISP-GPE decap dispatcher.
+ *
+ * Decaps IP-UDP-LISP-GPE header and based on the next protocol and in the
+ * GPE header and the vni decides the next node to forward the packet to.
+ *
+ * @param[in] vm vlib_main_t corresponding to current thread.
+ * @param[in] node vlib_node_runtime_t data for this node.
+ * @param[in] frame vlib_frame_t whose contents should be dispatched.
+ *
+ * @return number of vectors in frame.
+ */
+static uword
+lisp_gpe_input_inline (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame, u8 is_v4)
+{
+ u32 n_left_from, next_index, *from, *to_next, thread_index;
+ u32 n_bytes = 0, n_packets = 0, last_sw_if_index = ~0, drops = 0;
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+
+ thread_index = vm->thread_index;
+ from = vlib_frame_vector_args (from_frame);
+ n_left_from = 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;
+ ip4_udp_lisp_gpe_header_t *iul4_0, *iul4_1;
+ ip6_udp_lisp_gpe_header_t *iul6_0, *iul6_1;
+ lisp_gpe_header_t *lh0, *lh1;
+ u32 next0, next1, error0, error1;
+ uword *si0, *si1;
+ tunnel_lookup_t *tl0, *tl1;
+
+ /* 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, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, LOAD);
+ }
+
+ bi0 = from[0];
+ bi1 = from[1];
+ to_next[0] = bi0;
+ to_next[1] = bi1;
+ from += 2;
+ to_next += 2;
+ n_left_to_next -= 2;
+ n_left_from -= 2;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ b1 = vlib_get_buffer (vm, bi1);
+
+ /* udp leaves current_data pointing at the lisp header */
+ if (is_v4)
+ {
+ vlib_buffer_advance (b0,
+ -(word) (sizeof (udp_header_t) +
+ sizeof (ip4_header_t)));
+ vlib_buffer_advance (b1,
+ -(word) (sizeof (udp_header_t) +
+ sizeof (ip4_header_t)));
+
+ iul4_0 = vlib_buffer_get_current (b0);
+ iul4_1 = vlib_buffer_get_current (b1);
+
+ /* pop (ip, udp, lisp-gpe) */
+ vlib_buffer_advance (b0, sizeof (*iul4_0));
+ vlib_buffer_advance (b1, sizeof (*iul4_1));
+
+ lh0 = &iul4_0->lisp;
+ lh1 = &iul4_1->lisp;
+ }
+ else
+ {
+ vlib_buffer_advance (b0,
+ -(word) (sizeof (udp_header_t) +
+ sizeof (ip6_header_t)));
+ vlib_buffer_advance (b1,
+ -(word) (sizeof (udp_header_t) +
+ sizeof (ip6_header_t)));
+
+ iul6_0 = vlib_buffer_get_current (b0);
+ iul6_1 = vlib_buffer_get_current (b1);
+
+ /* pop (ip, udp, lisp-gpe) */
+ vlib_buffer_advance (b0, sizeof (*iul6_0));
+ vlib_buffer_advance (b1, sizeof (*iul6_1));
+
+ lh0 = &iul6_0->lisp;
+ lh1 = &iul6_1->lisp;
+ }
+
+ /* determine next_index from lisp-gpe header */
+ next0 = next_protocol_to_next_index (lh0,
+ vlib_buffer_get_current (b0));
+ next1 = next_protocol_to_next_index (lh1,
+ vlib_buffer_get_current (b1));
+
+ /* determine if tunnel is l2 or l3 */
+ tl0 = next_index_to_iface (lgm, next0);
+ tl1 = next_index_to_iface (lgm, next1);
+
+ /* map iid/vni to lisp-gpe sw_if_index which is used by ipx_input to
+ * decide the rx vrf and the input features to be applied */
+ si0 = hash_get (tl0->sw_if_index_by_vni,
+ clib_net_to_host_u32 (lh0->iid << 8));
+ si1 = hash_get (tl1->sw_if_index_by_vni,
+ clib_net_to_host_u32 (lh1->iid << 8));
+
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ vnet_update_l2_len (b0);
+ vnet_update_l2_len (b1);
+
+ if (si0)
+ {
+ incr_decap_stats (lgm->vnet_main, thread_index,
+ vlib_buffer_length_in_chain (vm, b0), si0[0],
+ &last_sw_if_index, &n_packets, &n_bytes);
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = si0[0];
+ error0 = 0;
+ }
+ else
+ {
+ next0 = LISP_GPE_INPUT_NEXT_DROP;
+ error0 = LISP_GPE_ERROR_NO_TUNNEL;
+ drops++;
+ }
+
+ if (si1)
+ {
+ incr_decap_stats (lgm->vnet_main, thread_index,
+ vlib_buffer_length_in_chain (vm, b1), si1[0],
+ &last_sw_if_index, &n_packets, &n_bytes);
+ vnet_buffer (b1)->sw_if_index[VLIB_RX] = si1[0];
+ error1 = 0;
+ }
+ else
+ {
+ next1 = LISP_GPE_INPUT_NEXT_DROP;
+ error1 = LISP_GPE_ERROR_NO_TUNNEL;
+ drops++;
+ }
+
+ b0->error = error0 ? node->errors[error0] : 0;
+ b1->error = error1 ? node->errors[error1] : 0;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lisp_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b0,
+ sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->h = lh0[0];
+ }
+
+ if (PREDICT_FALSE (b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lisp_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b1,
+ sizeof (*tr));
+ tr->next_index = next1;
+ tr->error = error1;
+ tr->h = lh1[0];
+ }
+
+ 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;
+ ip4_udp_lisp_gpe_header_t *iul4_0;
+ ip6_udp_lisp_gpe_header_t *iul6_0;
+ lisp_gpe_header_t *lh0;
+ u32 error0;
+ uword *si0;
+ tunnel_lookup_t *tl0;
+
+ 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);
+
+ /* udp leaves current_data pointing at the lisp header
+ * TODO: there's no difference in processing between v4 and v6
+ * encapsulated packets so the code should be simplified if ip header
+ * info is not going to be used for dp smrs/dpsec */
+ if (is_v4)
+ {
+ vlib_buffer_advance (b0,
+ -(word) (sizeof (udp_header_t) +
+ sizeof (ip4_header_t)));
+
+ iul4_0 = vlib_buffer_get_current (b0);
+
+ /* pop (ip, udp, lisp-gpe) */
+ vlib_buffer_advance (b0, sizeof (*iul4_0));
+
+ lh0 = &iul4_0->lisp;
+ }
+ else
+ {
+ vlib_buffer_advance (b0,
+ -(word) (sizeof (udp_header_t) +
+ sizeof (ip6_header_t)));
+
+ iul6_0 = vlib_buffer_get_current (b0);
+
+ /* pop (ip, udp, lisp-gpe) */
+ vlib_buffer_advance (b0, sizeof (*iul6_0));
+
+ lh0 = &iul6_0->lisp;
+ }
+
+ /* TODO if security is to be implemented, something similar to RPF,
+ * probably we'd like to check that the peer is allowed to send us
+ * packets. For this, we should use the tunnel table OR check that
+ * we have a mapping for the source eid and that the outer source of
+ * the packet is one of its locators */
+
+ /* determine next_index from lisp-gpe header */
+ next0 = next_protocol_to_next_index (lh0,
+ vlib_buffer_get_current (b0));
+
+ /* determine if tunnel is l2 or l3 */
+ tl0 = next_index_to_iface (lgm, next0);
+
+ /* map iid/vni to lisp-gpe sw_if_index which is used by ipx_input to
+ * decide the rx vrf and the input features to be applied.
+ * NOTE: vni uses only the first 24 bits */
+ si0 = hash_get (tl0->sw_if_index_by_vni,
+ clib_net_to_host_u32 (lh0->iid << 8));
+
+ /* Required to make the l2 tag push / pop code work on l2 subifs */
+ vnet_update_l2_len (b0);
+
+ if (si0)
+ {
+ incr_decap_stats (lgm->vnet_main, thread_index,
+ vlib_buffer_length_in_chain (vm, b0), si0[0],
+ &last_sw_if_index, &n_packets, &n_bytes);
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = si0[0];
+ error0 = 0;
+ }
+ else
+ {
+ next0 = LISP_GPE_INPUT_NEXT_DROP;
+ error0 = LISP_GPE_ERROR_NO_TUNNEL;
+ drops++;
+ }
+
+ /* TODO error handling if security is implemented */
+ b0->error = error0 ? node->errors[error0] : 0;
+
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ lisp_gpe_rx_trace_t *tr = vlib_add_trace (vm, node, b0,
+ sizeof (*tr));
+ tr->next_index = next0;
+ tr->error = error0;
+ tr->h = lh0[0];
+ }
+
+ 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);
+ }
+
+ /* flush iface stats */
+ incr_decap_stats (lgm->vnet_main, thread_index, 0, ~0, &last_sw_if_index,
+ &n_packets, &n_bytes);
+ vlib_node_increment_counter (vm, lisp_gpe_ip4_input_node.index,
+ LISP_GPE_ERROR_NO_TUNNEL, drops);
+ return from_frame->n_vectors;
+}
+
+static uword
+lisp_gpe_ip4_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return lisp_gpe_input_inline (vm, node, from_frame, 1);
+}
+
+static uword
+lisp_gpe_ip6_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ return lisp_gpe_input_inline (vm, node, from_frame, 0);
+}
+
+static char *lisp_gpe_ip4_input_error_strings[] = {
+#define lisp_gpe_error(n,s) s,
+#include <lisp/lisp-gpe/lisp_gpe_error.def>
+#undef lisp_gpe_error
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (lisp_gpe_ip4_input_node) = {
+ .function = lisp_gpe_ip4_input,
+ .name = "lisp-gpe-ip4-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .n_next_nodes = LISP_GPE_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [LISP_GPE_INPUT_NEXT_##s] = n,
+ foreach_lisp_gpe_ip_input_next
+#undef _
+ },
+
+ .n_errors = ARRAY_LEN (lisp_gpe_ip4_input_error_strings),
+ .error_strings = lisp_gpe_ip4_input_error_strings,
+
+ .format_buffer = format_lisp_gpe_header_with_length,
+ .format_trace = format_lisp_gpe_rx_trace,
+ // $$$$ .unformat_buffer = unformat_lisp_gpe_header,
+};
+/* *INDENT-ON* */
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (lisp_gpe_ip6_input_node) = {
+ .function = lisp_gpe_ip6_input,
+ .name = "lisp-gpe-ip6-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+ .n_next_nodes = LISP_GPE_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [LISP_GPE_INPUT_NEXT_##s] = n,
+ foreach_lisp_gpe_ip_input_next
+#undef _
+ },
+
+ .n_errors = ARRAY_LEN (lisp_gpe_ip4_input_error_strings),
+ .error_strings = lisp_gpe_ip4_input_error_strings,
+
+ .format_buffer = format_lisp_gpe_header_with_length,
+ .format_trace = format_lisp_gpe_rx_trace,
+ // $$$$ .unformat_buffer = unformat_lisp_gpe_header,
+};
+/* *INDENT-ON* */
+
+/**
+ * Adds arc from lisp-gpe-input to nsh-input if nsh-input is available
+ */
+static void
+gpe_add_arc_from_input_to_nsh ()
+{
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+ vlib_main_t *vm = lgm->vlib_main;
+ vlib_node_t *nsh_input;
+
+ /* Arc already exists */
+ if (next_proto_to_next_index[LISP_GPE_NEXT_PROTO_NSH]
+ != LISP_GPE_INPUT_NEXT_DROP)
+ return;
+
+ /* Check if nsh-input is available */
+ if ((nsh_input = vlib_get_node_by_name (vm, (u8 *) "nsh-input")))
+ {
+ u32 slot4, slot6;
+ slot4 = vlib_node_add_next_with_slot (vm, lisp_gpe_ip4_input_node.index,
+ nsh_input->index,
+ LISP_GPE_NEXT_PROTO_NSH);
+ slot6 = vlib_node_add_next_with_slot (vm, lisp_gpe_ip6_input_node.index,
+ nsh_input->index,
+ LISP_GPE_NEXT_PROTO_NSH);
+ ASSERT (slot4 == slot6 && slot4 == LISP_GPE_INPUT_NEXT_NSH_INPUT);
+
+ next_proto_to_next_index[LISP_GPE_NEXT_PROTO_NSH] = slot4;
+ }
+}
+
+/** GPE decap init function. */
+clib_error_t *
+gpe_decap_init (vlib_main_t * vm)
+{
+ clib_error_t *error = 0;
+
+ if ((error = vlib_call_init_function (vm, lisp_gpe_init)))
+ return error;
+
+ gpe_add_arc_from_input_to_nsh ();
+ return 0;
+}
+
+static uword
+lisp_gpe_nsh_placeholder_input (vlib_main_t * vm, vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ vlib_node_increment_counter (vm, node->node_index, 0, 1);
+ return from_frame->n_vectors;
+}
+
+static char *lisp_gpe_nsh_placeholder_error_strings[] = {
+ "lisp gpe placeholder nsh decap",
+};
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (lisp_gpe_nsh_placeholder_input_node) = {
+ .function = lisp_gpe_nsh_placeholder_input,
+ .name = "lisp-gpe-nsh-placeholder-input",
+ .vector_size = sizeof (u32),
+ .type = VLIB_NODE_TYPE_INTERNAL,
+ .n_next_nodes = 1,
+
+ .n_errors = 1,
+ .error_strings = lisp_gpe_nsh_placeholder_error_strings,
+
+ .next_nodes = {
+ [0] = "error-drop",
+ },
+};
+/* *INDENT-ON* */
+
+static clib_error_t *
+lisp_add_placeholder_nsh_node_command_fn (vlib_main_t * vm,
+ unformat_input_t * input,
+ vlib_cli_command_t * cmd)
+{
+ lisp_gpe_main_t *lgm = vnet_lisp_gpe_get_main ();
+ vlib_node_add_next (lgm->vlib_main, lisp_gpe_ip4_input_node.index,
+ lisp_gpe_nsh_placeholder_input_node.index);
+ next_proto_to_next_index[LISP_GPE_NEXT_PROTO_NSH] =
+ LISP_GPE_INPUT_NEXT_NSH_INPUT;
+ return 0;
+}
+
+/* *INDENT-OFF* */
+VLIB_CLI_COMMAND (lisp_add_placeholder_nsh_node_command, static) = {
+ .path = "test one nsh add-placeholder-decap-node",
+ .function = lisp_add_placeholder_nsh_node_command_fn,
+};
+/* *INDENT-ON* */
+
+VLIB_INIT_FUNCTION (gpe_decap_init);
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */