+++ /dev/null
-/*
- * 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);
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