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authorFlorin Coras <fcoras@cisco.com>2017-01-26 14:25:34 -0800
committerNeale Ranns <nranns@cisco.com>2017-02-13 08:51:30 +0000
commitce1b4c7f05ce28d7b73eb7ed0a8ea4bd483f09e9 (patch)
tree5e7f6cab01b2df39d12d3865af7c809916c51d63 /src/vnet/adj/adj_nsh.c
parentfdd81af6afe6c782ad2c1a139210378badec626b (diff)
Basic support for LISP-GPE encapsulated NSH packets
Change-Id: I97fedb0f70dd18ed9bbe985407cc5fe714e8a2e2 Signed-off-by: Florin Coras <fcoras@cisco.com>
Diffstat (limited to 'src/vnet/adj/adj_nsh.c')
-rw-r--r--src/vnet/adj/adj_nsh.c211
1 files changed, 211 insertions, 0 deletions
diff --git a/src/vnet/adj/adj_nsh.c b/src/vnet/adj/adj_nsh.c
new file mode 100644
index 00000000000..9a0f9d8b9d6
--- /dev/null
+++ b/src/vnet/adj/adj_nsh.c
@@ -0,0 +1,211 @@
+/*
+ * Copyright (c) 2017 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/vnet.h>
+#include <vnet/adj/adj_nsh.h>
+#include <vnet/ip/ip.h>
+
+nsh_main_dummy_t nsh_main_dummy;
+
+/**
+ * @brief Trace data for a NSH Midchain
+ */
+typedef struct adj_nsh_trace_t_ {
+ /** Adjacency index taken. */
+ u32 adj_index;
+} adj_nsh_trace_t;
+
+static u8 *
+format_adj_nsh_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 *);
+ adj_nsh_trace_t * t = va_arg (*args, adj_nsh_trace_t *);
+
+ s = format (s, "adj-idx %d : %U",
+ t->adj_index,
+ format_ip_adjacency, t->adj_index, FORMAT_IP_ADJACENCY_NONE);
+ return s;
+}
+
+typedef enum adj_nsh_rewrite_next_t_
+{
+ ADJ_NSH_REWRITE_NEXT_DROP,
+} adj_gpe_rewrite_next_t;
+
+always_inline uword
+adj_nsh_rewrite_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ int is_midchain)
+{
+ u32 * from = vlib_frame_vector_args (frame);
+ u32 n_left_from, n_left_to_next, * to_next, next_index;
+ u32 cpu_index = os_get_cpu_number();
+
+ n_left_from = frame->n_vectors;
+ next_index = node->cached_next_index;
+
+ while (n_left_from > 0)
+ {
+ vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next);
+
+ while (n_left_from > 0 && n_left_to_next > 0)
+ {
+ ip_adjacency_t * adj0;
+ vlib_buffer_t * p0;
+ char *h0;
+ u32 pi0, rw_len0, adj_index0, next0 = 0;
+ u32 tx_sw_if_index0;
+
+ pi0 = to_next[0] = from[0];
+ from += 1;
+ n_left_from -= 1;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ p0 = vlib_get_buffer (vm, pi0);
+ h0 = vlib_buffer_get_current (p0);
+
+ adj_index0 = vnet_buffer (p0)->ip.adj_index[VLIB_TX];
+
+ /* We should never rewrite a pkt using the MISS adjacency */
+ ASSERT(adj_index0);
+
+ adj0 = adj_get (adj_index0);
+
+ /* Guess we are only writing on simple IP4 header. */
+ vnet_rewrite_one_header(adj0[0], h0, sizeof(ip4_header_t));
+
+ /* Update packet buffer attributes/set output interface. */
+ rw_len0 = adj0[0].rewrite_header.data_bytes;
+ vnet_buffer(p0)->ip.save_rewrite_length = rw_len0;
+
+ vlib_increment_combined_counter(&adjacency_counters,
+ cpu_index,
+ adj_index0,
+ /* packet increment */ 0,
+ /* byte increment */ rw_len0);
+
+ /* Check MTU of outgoing interface. */
+ if (PREDICT_TRUE((vlib_buffer_length_in_chain (vm, p0) <=
+ adj0[0].rewrite_header.max_l3_packet_bytes)))
+ {
+ /* Don't adjust the buffer for ttl issue; icmp-error node wants
+ * to see the IP headerr */
+ p0->current_data -= rw_len0;
+ p0->current_length += rw_len0;
+ tx_sw_if_index0 = adj0[0].rewrite_header.sw_if_index;
+
+ if (is_midchain)
+ {
+ adj0->sub_type.midchain.fixup_func(vm, adj0, p0);
+ }
+
+ vnet_buffer (p0)->sw_if_index[VLIB_TX] = tx_sw_if_index0;
+
+ /*
+ * Follow the feature ARC. this will result eventually in
+ * the midchain-tx node
+ */
+ vnet_feature_arc_start (nsh_main_dummy.output_feature_arc_index,
+ tx_sw_if_index0, &next0, p0);
+ }
+ else
+ {
+ /* can't fragment NSH */
+ next0 = ADJ_NSH_REWRITE_NEXT_DROP;
+ }
+
+ if (PREDICT_FALSE(p0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ adj_nsh_trace_t *tr = vlib_add_trace (vm, node,
+ p0, sizeof (*tr));
+ tr->adj_index = vnet_buffer(p0)->ip.adj_index[VLIB_TX];
+ }
+
+ vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
+ to_next, n_left_to_next,
+ pi0, next0);
+ }
+
+ vlib_put_next_frame (vm, node, next_index, n_left_to_next);
+ }
+
+ return frame->n_vectors;
+}
+
+static uword
+adj_nsh_rewrite (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return adj_nsh_rewrite_inline (vm, node, frame, 0);
+}
+
+static uword
+adj_nsh_midchain (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return adj_nsh_rewrite_inline (vm, node, frame, 1);
+}
+
+VLIB_REGISTER_NODE (adj_nsh_rewrite_node) = {
+ .function = adj_nsh_rewrite,
+ .name = "adj-nsh-rewrite",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_adj_nsh_trace,
+
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [ADJ_NSH_REWRITE_NEXT_DROP] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (adj_nsh_rewrite_node, adj_nsh_rewrite)
+
+VLIB_REGISTER_NODE (adj_nsh_midchain_node) = {
+ .function = adj_nsh_midchain,
+ .name = "adj-nsh-midchain",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_adj_nsh_trace,
+
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [ADJ_NSH_REWRITE_NEXT_DROP] = "error-drop",
+ },
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (adj_nsh_midchain_node, adj_nsh_midchain)
+
+/* Built-in ip4 tx feature path definition */
+/* *INDENT-OFF* */
+VNET_FEATURE_ARC_INIT (nsh_output, static) =
+{
+ .arc_name = "nsh-output",
+ .start_nodes = VNET_FEATURES ("adj-nsh-midchain"),
+ .arc_index_ptr = &nsh_main_dummy.output_feature_arc_index,
+};
+
+VNET_FEATURE_INIT (nsh_tx_drop, static) =
+{
+ .arc_name = "nsh-output",
+ .node_name = "error-drop",
+ .runs_before = 0, /* not before any other features */
+};
+/* *INDENT-ON* */