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-rw-r--r--src/vnet/ipsec-gre/node.c433
1 files changed, 433 insertions, 0 deletions
diff --git a/src/vnet/ipsec-gre/node.c b/src/vnet/ipsec-gre/node.c
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+++ b/src/vnet/ipsec-gre/node.c
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+/*
+ * 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-GRE over IPSec packet processing.
+ *
+ * Removes GRE header from the packet and sends it to the l2-input node.
+*/
+
+#include <vlib/vlib.h>
+#include <vnet/pg/pg.h>
+#include <vnet/ipsec-gre/ipsec_gre.h>
+#include <vppinfra/sparse_vec.h>
+
+#define foreach_ipsec_gre_input_next \
+_(PUNT, "error-punt") \
+_(DROP, "error-drop") \
+_(L2_INPUT, "l2-input")
+
+typedef enum {
+#define _(s,n) IPSEC_GRE_INPUT_NEXT_##s,
+ foreach_ipsec_gre_input_next
+#undef _
+ IPSEC_GRE_INPUT_N_NEXT,
+} ipsec_gre_input_next_t;
+
+typedef struct {
+ u32 tunnel_id;
+ u32 length;
+ ip4_address_t src;
+ ip4_address_t dst;
+} ipsec_gre_rx_trace_t;
+
+u8 * format_ipsec_gre_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 *);
+ ipsec_gre_rx_trace_t * t = va_arg (*args, ipsec_gre_rx_trace_t *);
+
+ s = format (s, "GRE: tunnel %d len %d src %U dst %U",
+ t->tunnel_id, clib_net_to_host_u16(t->length),
+ format_ip4_address, &t->src.as_u8,
+ format_ip4_address, &t->dst.as_u8);
+ return s;
+}
+
+/**
+ * @brief L2-GRE over IPSec input node.
+ * @node ipsec-gre-input
+ *
+ * This node remove GRE header.
+ *
+ * @param vm vlib_main_t corresponding to the current thread.
+ * @param node vlib_node_runtime_t data for this node.
+ * @param from_frame vlib_frame_t whose contents should be dispatched.
+ *
+ * @par Graph mechanics: buffer metadata, next index usage
+ *
+ * <em>Uses:</em>
+ * - <code>ip->src_address</code> and <code>ip->dst_address</code>
+ * - Match tunnel by source and destination addresses in GRE IP header.
+ *
+ * <em>Sets:</em>
+ * - <code>vnet_buffer(b)->gre.src</code>
+ * - Save tunnel source IPv4 address.
+ * - <code>vnet_buffer(b)->gre.dst</code>
+ * - Save tunnel destination IPv4 address.
+ * - <code>vnet_buffer(b)->sw_if_index[VLIB_RX]</code>
+ * - Set input sw_if_index to IPSec-GRE tunnel for learning.
+ *
+ * <em>Next Index:</em>
+ * - Dispatches the packet to the l2-input node.
+*/
+static uword
+ipsec_gre_input (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ ipsec_gre_main_t * igm = &ipsec_gre_main;
+ u32 n_left_from, next_index, * from, * to_next;
+ u64 cached_tunnel_key = (u64) ~0;
+ u32 cached_tunnel_sw_if_index = 0, tunnel_sw_if_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;
+ gre_header_t * h0, * h1;
+ u16 version0, version1, protocol0, protocol1;
+ int verr0, verr1;
+ u32 next0, next1;
+ ip4_header_t *ip0, *ip1;
+
+ /* 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, sizeof (h0[0]), LOAD);
+ CLIB_PREFETCH (p3->data, sizeof (h1[0]), 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);
+
+ /* ip4_local hands us the ip header, not the gre header */
+ ip0 = vlib_buffer_get_current (b0);
+ ip1 = vlib_buffer_get_current (b1);
+
+ /* Save src + dst ip4 address */
+ vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
+ vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
+ vnet_buffer(b1)->gre.src = ip1->src_address.as_u32;
+ vnet_buffer(b1)->gre.dst = ip1->dst_address.as_u32;
+
+ vlib_buffer_advance (b0, sizeof (*ip0));
+ vlib_buffer_advance (b1, sizeof (*ip1));
+
+ h0 = vlib_buffer_get_current (b0);
+ h1 = vlib_buffer_get_current (b1);
+
+ protocol0 = clib_net_to_host_u16 (h0->protocol);
+ protocol1 = clib_net_to_host_u16 (h1->protocol);
+ if (PREDICT_TRUE(protocol0 == 0x0001))
+ {
+ next0 = IPSEC_GRE_INPUT_NEXT_L2_INPUT;
+ b0->error = node->errors[IPSEC_GRE_ERROR_NONE];
+ }
+ else
+ {
+ clib_warning("unknown GRE protocol: %d", protocol0);
+ b0->error = node->errors[IPSEC_GRE_ERROR_UNKNOWN_PROTOCOL];
+ next0 = IPSEC_GRE_INPUT_NEXT_DROP;
+ }
+ if (PREDICT_TRUE(protocol1 == 0x0001))
+ {
+ next1 = IPSEC_GRE_INPUT_NEXT_L2_INPUT;
+ b1->error = node->errors[IPSEC_GRE_ERROR_NONE];
+ }
+ else
+ {
+ clib_warning("unknown GRE protocol: %d", protocol1);
+ b1->error = node->errors[IPSEC_GRE_ERROR_UNKNOWN_PROTOCOL];
+ next1 = IPSEC_GRE_INPUT_NEXT_DROP;
+ }
+
+ version0 = clib_net_to_host_u16 (h0->flags_and_version);
+ verr0 = version0 & GRE_VERSION_MASK;
+ version1 = clib_net_to_host_u16 (h1->flags_and_version);
+ verr1 = version1 & GRE_VERSION_MASK;
+
+ b0->error = verr0 ? node->errors[IPSEC_GRE_ERROR_UNSUPPORTED_VERSION]
+ : b0->error;
+ next0 = verr0 ? IPSEC_GRE_INPUT_NEXT_DROP : next0;
+ b1->error = verr1 ? node->errors[IPSEC_GRE_ERROR_UNSUPPORTED_VERSION]
+ : b1->error;
+ next1 = verr1 ? IPSEC_GRE_INPUT_NEXT_DROP : next1;
+
+ /* For L2 payload set input sw_if_index to GRE tunnel for learning */
+ if (PREDICT_TRUE(next0 == IPSEC_GRE_INPUT_NEXT_L2_INPUT))
+ {
+ u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
+ (u64)(vnet_buffer(b0)->gre.src);
+
+ if (cached_tunnel_key != key)
+ {
+ vnet_hw_interface_t * hi;
+ ipsec_gre_tunnel_t * t;
+ uword * p;
+
+ p = hash_get (igm->tunnel_by_key, key);
+ if (!p)
+ {
+ next0 = IPSEC_GRE_INPUT_NEXT_DROP;
+ b0->error = node->errors[IPSEC_GRE_ERROR_NO_SUCH_TUNNEL];
+ goto drop0;
+ }
+ t = pool_elt_at_index (igm->tunnels, p[0]);
+ hi = vnet_get_hw_interface (igm->vnet_main,
+ t->hw_if_index);
+ tunnel_sw_if_index = hi->sw_if_index;
+ cached_tunnel_sw_if_index = tunnel_sw_if_index;
+ }
+ else
+ {
+ tunnel_sw_if_index = cached_tunnel_sw_if_index;
+ }
+ vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+ }
+
+drop0:
+ /* For L2 payload set input sw_if_index to GRE tunnel for learning */
+ if (PREDICT_TRUE(next1 == IPSEC_GRE_INPUT_NEXT_L2_INPUT))
+ {
+ u64 key = ((u64)(vnet_buffer(b1)->gre.dst) << 32) |
+ (u64)(vnet_buffer(b1)->gre.src);
+
+ if (cached_tunnel_key != key)
+ {
+ vnet_hw_interface_t * hi;
+ ipsec_gre_tunnel_t * t;
+ uword * p;
+
+ p = hash_get (igm->tunnel_by_key, key);
+ if (!p)
+ {
+ next1 = IPSEC_GRE_INPUT_NEXT_DROP;
+ b1->error = node->errors[IPSEC_GRE_ERROR_NO_SUCH_TUNNEL];
+ goto drop1;
+ }
+ t = pool_elt_at_index (igm->tunnels, p[0]);
+ hi = vnet_get_hw_interface (igm->vnet_main,
+ t->hw_if_index);
+ tunnel_sw_if_index = hi->sw_if_index;
+ cached_tunnel_sw_if_index = tunnel_sw_if_index;
+ }
+ else
+ {
+ tunnel_sw_if_index = cached_tunnel_sw_if_index;
+ }
+ vnet_buffer(b1)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+ }
+
+drop1:
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_gre_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = ~0;
+ tr->length = ip0->length;
+ tr->src.as_u32 = ip0->src_address.as_u32;
+ tr->dst.as_u32 = ip0->dst_address.as_u32;
+ }
+
+ if (PREDICT_FALSE(b1->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_gre_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b1, sizeof (*tr));
+ tr->tunnel_id = ~0;
+ tr->length = ip1->length;
+ tr->src.as_u32 = ip1->src_address.as_u32;
+ tr->dst.as_u32 = ip1->dst_address.as_u32;
+ }
+
+ vlib_buffer_advance (b0, sizeof (*h0));
+ vlib_buffer_advance (b1, sizeof (*h1));
+
+ 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;
+ gre_header_t * h0;
+ ip4_header_t * ip0;
+ u16 version0, protocol0;
+ int verr0;
+ 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);
+ ip0 = vlib_buffer_get_current (b0);
+
+ vnet_buffer(b0)->gre.src = ip0->src_address.as_u32;
+ vnet_buffer(b0)->gre.dst = ip0->dst_address.as_u32;
+
+ vlib_buffer_advance (b0, sizeof (*ip0));
+
+ h0 = vlib_buffer_get_current (b0);
+
+ protocol0 = clib_net_to_host_u16 (h0->protocol);
+ if (PREDICT_TRUE(protocol0 == 0x0001))
+ {
+ next0 = IPSEC_GRE_INPUT_NEXT_L2_INPUT;
+ b0->error = node->errors[IPSEC_GRE_ERROR_NONE];
+ }
+ else
+ {
+ clib_warning("unknown GRE protocol: %d", protocol0);
+ b0->error = node->errors[IPSEC_GRE_ERROR_UNKNOWN_PROTOCOL];
+ next0 = IPSEC_GRE_INPUT_NEXT_DROP;
+ }
+
+ version0 = clib_net_to_host_u16 (h0->flags_and_version);
+ verr0 = version0 & GRE_VERSION_MASK;
+ b0->error = verr0 ? node->errors[IPSEC_GRE_ERROR_UNSUPPORTED_VERSION]
+ : b0->error;
+ next0 = verr0 ? IPSEC_GRE_INPUT_NEXT_DROP : next0;
+
+ /* For L2 payload set input sw_if_index to GRE tunnel for learning */
+ if (PREDICT_FALSE(next0 == IPSEC_GRE_INPUT_NEXT_L2_INPUT))
+ {
+ u64 key = ((u64)(vnet_buffer(b0)->gre.dst) << 32) |
+ (u64)(vnet_buffer(b0)->gre.src);
+
+ if (cached_tunnel_key != key)
+ {
+ vnet_hw_interface_t * hi;
+ ipsec_gre_tunnel_t * t;
+ uword * p;
+
+ p = hash_get (igm->tunnel_by_key, key);
+ if (!p)
+ {
+ next0 = IPSEC_GRE_INPUT_NEXT_DROP;
+ b0->error = node->errors[IPSEC_GRE_ERROR_NO_SUCH_TUNNEL];
+ goto drop;
+ }
+ t = pool_elt_at_index (igm->tunnels, p[0]);
+ hi = vnet_get_hw_interface (igm->vnet_main,
+ t->hw_if_index);
+ tunnel_sw_if_index = hi->sw_if_index;
+ cached_tunnel_sw_if_index = tunnel_sw_if_index;
+ }
+ else
+ {
+ tunnel_sw_if_index = cached_tunnel_sw_if_index;
+ }
+ vnet_buffer(b0)->sw_if_index[VLIB_RX] = tunnel_sw_if_index;
+ }
+
+drop:
+ if (PREDICT_FALSE(b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_gre_rx_trace_t *tr = vlib_add_trace (vm, node,
+ b0, sizeof (*tr));
+ tr->tunnel_id = ~0;
+ tr->length = ip0->length;
+ tr->src.as_u32 = ip0->src_address.as_u32;
+ tr->dst.as_u32 = ip0->dst_address.as_u32;
+ }
+
+ vlib_buffer_advance (b0, sizeof (*h0));
+
+ 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);
+ }
+ vlib_node_increment_counter (vm, ipsec_gre_input_node.index,
+ IPSEC_GRE_ERROR_PKTS_DECAP, from_frame->n_vectors);
+ return from_frame->n_vectors;
+}
+
+static char * ipsec_gre_error_strings[] = {
+#define ipsec_gre_error(n,s) s,
+#include "error.def"
+#undef ipsec_gre_error
+};
+
+VLIB_REGISTER_NODE (ipsec_gre_input_node) = {
+ .function = ipsec_gre_input,
+ .name = "ipsec-gre-input",
+ /* Takes a vector of packets. */
+ .vector_size = sizeof (u32),
+
+ .n_errors = IPSEC_GRE_N_ERROR,
+ .error_strings = ipsec_gre_error_strings,
+
+ .n_next_nodes = IPSEC_GRE_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [IPSEC_GRE_INPUT_NEXT_##s] = n,
+ foreach_ipsec_gre_input_next
+#undef _
+ },
+
+ .format_trace = format_ipsec_gre_rx_trace,
+};
+
+VLIB_NODE_FUNCTION_MULTIARCH (ipsec_gre_input_node, ipsec_gre_input)
+
+static clib_error_t * ipsec_gre_input_init (vlib_main_t * vm)
+{
+ {
+ clib_error_t * error;
+ error = vlib_call_init_function (vm, ipsec_gre_init);
+ if (error)
+ clib_error_report (error);
+ }
+
+ return 0;
+}
+
+VLIB_INIT_FUNCTION (ipsec_gre_input_init);