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authorNeale Ranns <nranns@cisco.com>2017-10-21 10:53:20 -0700
committerDamjan Marion <dmarion.lists@gmail.com>2017-11-09 15:16:52 +0000
commitd792d9c01e60656cbfe1b0f1fd6a9b125f5dab0c (patch)
treedb88d99dd8102389fb92e8ed44bc7d6a55dc3080 /src/vnet/bier/bier_imp_node.c
parenta2ff7b8cfc829ffbb6d5de7534efb51f7cba9cf3 (diff)
BIER
- see draft-ietf-bier-mpls-encapsulation-10 - midpoint, head and tail functions - supported payload protocols; IPv4 and IPv6 only. Change-Id: I59d7363bb6fdfdce8e4016a68a9c8f5a5e5791cb Signed-off-by: Neale Ranns <nranns@cisco.com>
Diffstat (limited to 'src/vnet/bier/bier_imp_node.c')
-rw-r--r--src/vnet/bier/bier_imp_node.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/src/vnet/bier/bier_imp_node.c b/src/vnet/bier/bier_imp_node.c
new file mode 100644
index 00000000000..e9aae93b460
--- /dev/null
+++ b/src/vnet/bier/bier_imp_node.c
@@ -0,0 +1,217 @@
+/*
+ * 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.
+ */
+
+#include <vnet/bier/bier_imp.h>
+#include <vnet/bier/bier_hdr_inlines.h>
+#include <vnet/ip/ip.h>
+
+/**
+ * @brief A struct to hold tracing information for the BIER imposition
+ * node.
+ */
+typedef struct bier_imp_trace_t_
+{
+ /**
+ * BIER imposition object hit
+ */
+ index_t imp;
+
+ /**
+ * BIER hdr applied
+ */
+ bier_hdr_t hdr;
+} bier_imp_trace_t;
+
+always_inline uword
+bier_imp_dpo_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame,
+ fib_protocol_t fproto,
+ bier_hdr_proto_id_t bproto)
+{
+ u32 n_left_from, next_index, * from, * to_next;
+
+ 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 > 0 && n_left_to_next > 0)
+ {
+ vlib_buffer_t * b0;
+ bier_imp_t *bimp0;
+ bier_hdr_t *hdr0;
+ u32 bi0, bii0;
+ u32 next0;
+
+ 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);
+
+ bii0 = vnet_buffer(b0)->ip.adj_index[VLIB_TX];
+ bimp0 = bier_imp_get(bii0);
+
+ if (FIB_PROTOCOL_IP4 == fproto)
+ {
+ /*
+ * decrement the TTL on ingress to the BIER domain
+ */
+ ip4_header_t * ip0 = vlib_buffer_get_current(b0);
+ u32 checksum0;
+
+ checksum0 = ip0->checksum + clib_host_to_net_u16 (0x0100);
+ checksum0 += checksum0 >= 0xffff;
+
+ ip0->checksum = checksum0;
+ ip0->ttl -= 1;
+
+ /*
+ * calculate an entropy
+ */
+ if (0 == vnet_buffer(b0)->ip.flow_hash)
+ {
+ vnet_buffer(b0)->ip.flow_hash =
+ ip4_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
+ }
+ }
+ if (FIB_PROTOCOL_IP6 == fproto)
+ {
+ /*
+ * decrement the TTL on ingress to the BIER domain
+ */
+ ip6_header_t * ip0 = vlib_buffer_get_current(b0);
+
+ ip0->hop_limit -= 1;
+
+ /*
+ * calculate an entropy
+ */
+ if (0 == vnet_buffer(b0)->ip.flow_hash)
+ {
+ vnet_buffer(b0)->ip.flow_hash =
+ ip6_compute_flow_hash (ip0, IP_FLOW_HASH_DEFAULT);
+ }
+ }
+
+ /* Paint the BIER header */
+ vlib_buffer_advance(b0, -(sizeof(bier_hdr_t) +
+ bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
+ hdr0 = vlib_buffer_get_current(b0);
+ clib_memcpy(hdr0, &bimp0->bi_hdr,
+ (sizeof(bier_hdr_t) +
+ bier_hdr_len_id_to_num_bytes(bimp0->bi_tbl.bti_hdr_len)));
+ /*
+ * Fixup the entropy and protocol, both of which have a
+ * zero value post the paint job
+ */
+ hdr0->bh_oam_dscp_proto |=
+ clib_host_to_net_u16(bproto << BIER_HDR_PROTO_FIELD_SHIFT);
+ hdr0->bh_first_word |=
+ clib_host_to_net_u32((vnet_buffer(b0)->ip.flow_hash &
+ BIER_HDR_ENTROPY_FIELD_MASK) <<
+ BIER_HDR_ENTROPY_FIELD_SHIFT);
+
+ /* next node */
+ next0 = bimp0->bi_dpo[fproto].dpoi_next_node;
+ vnet_buffer(b0)->ip.adj_index[VLIB_TX] =
+ bimp0->bi_dpo[fproto].dpoi_index;
+
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ bier_imp_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ tr->imp = bii0;
+ tr->hdr = *hdr0;
+ }
+
+ 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 from_frame->n_vectors;
+}
+
+static u8 *
+format_bier_imp_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 *);
+ bier_imp_trace_t * t;
+ u32 indent;
+
+ t = va_arg (*args, bier_imp_trace_t *);
+ indent = format_get_indent (s);
+
+ s = format (s, "%U", format_bier_imp, t->imp, indent, BIER_SHOW_BRIEF);
+ return (s);
+}
+
+static uword
+bier_imp_ip4 (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (bier_imp_dpo_inline(vm, node, frame,
+ FIB_PROTOCOL_IP4,
+ BIER_HDR_PROTO_IPV4));
+}
+
+VLIB_REGISTER_NODE (bier_imp_ip4_node) = {
+ .function = bier_imp_ip4,
+ .name = "bier-imp-ip4",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_bier_imp_trace,
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [0] = "error-drop",
+ }
+};
+VLIB_NODE_FUNCTION_MULTIARCH (bier_imp_ip4_node, bier_imp_ip4)
+
+static uword
+bier_imp_ip6 (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame)
+{
+ return (bier_imp_dpo_inline(vm, node, frame,
+ FIB_PROTOCOL_IP6,
+ BIER_HDR_PROTO_IPV6));
+}
+
+VLIB_REGISTER_NODE (bier_imp_ip6_node) = {
+ .function = bier_imp_ip6,
+ .name = "bier-imp-ip6",
+ .vector_size = sizeof (u32),
+
+ .format_trace = format_bier_imp_trace,
+ .n_next_nodes = 1,
+ .next_nodes = {
+ [0] = "error-drop",
+ }
+};
+VLIB_NODE_FUNCTION_MULTIARCH (bier_imp_ip6_node, bier_imp_ip6)