--- /dev/null
+/*
+ * Copyright (c) 2015 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.
+ */
+/*
+ * ip/ip4_source_check.c: IP v4 check source address (unicast RPF check)
+ *
+ * Copyright (c) 2008 Eliot Dresselhaus
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef __URPF_DP_H__
+#define __URPF_DP_H__
+
+#include <vnet/fib/ip4_fib.h>
+#include <vnet/fib/ip6_fib.h>
+#include <vnet/fib/fib_urpf_list.h>
+#include <vnet/dpo/load_balance.h>
+
+#include <urpf/urpf.h>
+
+/**
+ * @file
+ * @brief Unicast Reverse Path forwarding.
+ *
+ * This file contains the interface unicast source check.
+ */
+typedef struct
+{
+ index_t urpf;
+} urpf_trace_t;
+
+static u8 *
+format_urpf_trace (u8 * s, va_list * va)
+{
+ CLIB_UNUSED (vlib_main_t * vm) = va_arg (*va, vlib_main_t *);
+ CLIB_UNUSED (vlib_node_t * node) = va_arg (*va, vlib_node_t *);
+ urpf_trace_t *t = va_arg (*va, urpf_trace_t *);
+
+ s = format (s, "uRPF:%d", t->urpf);
+
+ return s;
+}
+
+#define foreach_urpf_error \
+ _(DROP, "uRPF Drop") \
+
+typedef enum urpf_error_t_
+{
+#define _(a,b) URPF_ERROR_##a,
+ foreach_urpf_error
+#undef _
+ URPF_N_ERROR,
+} urpf_error_t;
+
+typedef enum
+{
+ URPF_NEXT_DROP,
+ URPF_N_NEXT,
+} urpf_next_t;
+
+static_always_inline uword
+urpf_inline (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * frame,
+ ip_address_family_t af, vlib_dir_t dir, urpf_mode_t mode)
+{
+ vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b;
+ u16 nexts[VLIB_FRAME_SIZE], *next;
+ u32 n_left, *from;
+
+ from = vlib_frame_vector_args (frame);
+ n_left = frame->n_vectors;
+ b = bufs;
+ next = nexts;
+
+ vlib_get_buffers (vm, from, bufs, n_left);
+
+ while (n_left >= 4)
+ {
+ u32 pass0, lb_index0, pass1, lb_index1;
+ const load_balance_t *lb0, *lb1;
+ u32 fib_index0, fib_index1;
+ const u8 *h0, *h1;
+
+ /* Prefetch next iteration. */
+ {
+ vlib_prefetch_buffer_header (b[2], LOAD);
+ vlib_prefetch_buffer_header (b[3], LOAD);
+ vlib_prefetch_buffer_data (b[2], LOAD);
+ vlib_prefetch_buffer_data (b[3], LOAD);
+ }
+
+ h0 = (u8 *) vlib_buffer_get_current (b[0]);
+ h1 = (u8 *) vlib_buffer_get_current (b[1]);
+
+ if (VLIB_TX == dir)
+ {
+ h0 += vnet_buffer (b[0])->ip.save_rewrite_length;
+ h1 += vnet_buffer (b[1])->ip.save_rewrite_length;
+ }
+
+ if (AF_IP4 == af)
+ {
+ const ip4_header_t *ip0, *ip1;
+
+ ip0 = (ip4_header_t *) h0;
+ ip1 = (ip4_header_t *) h1;
+
+ fib_index0 = ip4_main.fib_index_by_sw_if_index
+ [vnet_buffer (b[0])->sw_if_index[dir]];
+ fib_index1 = ip4_main.fib_index_by_sw_if_index
+ [vnet_buffer (b[1])->sw_if_index[dir]];
+
+ ip4_fib_forwarding_lookup_x2 (fib_index0,
+ fib_index1,
+ &ip0->src_address,
+ &ip1->src_address,
+ &lb_index0, &lb_index1);
+ /* Pass multicast. */
+ pass0 = (ip4_address_is_multicast (&ip0->src_address) ||
+ ip4_address_is_global_broadcast (&ip0->src_address));
+ pass1 = (ip4_address_is_multicast (&ip1->src_address) ||
+ ip4_address_is_global_broadcast (&ip1->src_address));
+ }
+ else
+ {
+ const ip6_header_t *ip0, *ip1;
+
+ fib_index0 = ip6_main.fib_index_by_sw_if_index
+ [vnet_buffer (b[0])->sw_if_index[dir]];
+ fib_index1 = ip6_main.fib_index_by_sw_if_index
+ [vnet_buffer (b[1])->sw_if_index[dir]];
+
+ ip0 = (ip6_header_t *) h0;
+ ip1 = (ip6_header_t *) h1;
+
+ lb_index0 = ip6_fib_table_fwding_lookup (fib_index0,
+ &ip0->src_address);
+ lb_index1 = ip6_fib_table_fwding_lookup (fib_index1,
+ &ip1->src_address);
+ pass0 = ip6_address_is_multicast (&ip0->src_address);
+ pass1 = ip6_address_is_multicast (&ip1->src_address);
+ }
+
+ lb0 = load_balance_get (lb_index0);
+ lb1 = load_balance_get (lb_index1);
+
+ if (URPF_MODE_STRICT == mode)
+ {
+ /* for RX the check is: would this source adddress be forwarded
+ * out of the interface on which it was recieved, if yes allow.
+ * For TX it's; would this source addres be forwarded out of the
+ * interface through which it is being sent, if yes drop.
+ */
+ int res0, res1;
+
+ res0 = fib_urpf_check (lb0->lb_urpf,
+ vnet_buffer (b[0])->sw_if_index[dir]);
+ res1 = fib_urpf_check (lb1->lb_urpf,
+ vnet_buffer (b[1])->sw_if_index[dir]);
+
+ if (VLIB_RX == dir)
+ {
+ pass0 |= res0;
+ pass1 |= res1;
+ }
+ else
+ {
+ pass0 |= !res0 && fib_urpf_check_size (lb0->lb_urpf);
+ pass1 |= !res1 && fib_urpf_check_size (lb1->lb_urpf);
+ }
+ }
+ else
+ {
+ pass0 |= fib_urpf_check_size (lb0->lb_urpf);
+ pass1 |= fib_urpf_check_size (lb1->lb_urpf);
+ }
+
+ if (PREDICT_TRUE (pass0))
+ vnet_feature_next_u16 (&next[0], b[0]);
+ else
+ {
+ next[0] = URPF_NEXT_DROP;
+ b[0]->error = node->errors[URPF_ERROR_DROP];
+ }
+ if (PREDICT_TRUE (pass1))
+ vnet_feature_next_u16 (&next[1], b[1]);
+ else
+ {
+ next[1] = URPF_NEXT_DROP;
+ b[1]->error = node->errors[URPF_ERROR_DROP];
+ }
+
+ if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ urpf_trace_t *t;
+
+ t = vlib_add_trace (vm, node, b[0], sizeof (*t));
+ t->urpf = lb0->lb_urpf;
+ }
+ if (b[1]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ urpf_trace_t *t;
+
+ t = vlib_add_trace (vm, node, b[1], sizeof (*t));
+ t->urpf = lb1->lb_urpf;
+ }
+
+ b += 2;
+ next += 2;
+ n_left -= 2;
+ }
+
+ while (n_left)
+ {
+ u32 pass0, lb_index0, fib_index0;
+ const load_balance_t *lb0;
+ const u8 *h0;
+
+ h0 = (u8 *) vlib_buffer_get_current (b[0]);
+
+ if (VLIB_TX == dir)
+ h0 += vnet_buffer (b[0])->ip.save_rewrite_length;
+
+ if (AF_IP4 == af)
+ {
+ const ip4_header_t *ip0;
+
+ fib_index0 = ip4_main.fib_index_by_sw_if_index
+ [vnet_buffer (b[0])->sw_if_index[dir]];
+ ip0 = (ip4_header_t *) h0;
+
+ lb_index0 = ip4_fib_forwarding_lookup (fib_index0,
+ &ip0->src_address);
+
+ /* Pass multicast. */
+ pass0 = (ip4_address_is_multicast (&ip0->src_address) ||
+ ip4_address_is_global_broadcast (&ip0->src_address));
+ }
+ else
+ {
+ const ip6_header_t *ip0;
+
+ ip0 = (ip6_header_t *) h0;
+ fib_index0 = ip6_main.fib_index_by_sw_if_index
+ [vnet_buffer (b[0])->sw_if_index[dir]];
+
+ lb_index0 = ip6_fib_table_fwding_lookup (fib_index0,
+ &ip0->src_address);
+ pass0 = ip6_address_is_multicast (&ip0->src_address);
+ }
+
+ lb0 = load_balance_get (lb_index0);
+
+ if (URPF_MODE_STRICT == mode)
+ {
+ int res0;
+
+ res0 = fib_urpf_check (lb0->lb_urpf,
+ vnet_buffer (b[0])->sw_if_index[dir]);
+ if (VLIB_RX == dir)
+ pass0 |= res0;
+ else
+ pass0 |= !res0 && fib_urpf_check_size (lb0->lb_urpf);
+ }
+ else
+ pass0 |= fib_urpf_check_size (lb0->lb_urpf);
+
+ if (PREDICT_TRUE (pass0))
+ vnet_feature_next_u16 (&next[0], b[0]);
+ else
+ {
+ next[0] = URPF_NEXT_DROP;
+ b[0]->error = node->errors[URPF_ERROR_DROP];
+ }
+
+ if (b[0]->flags & VLIB_BUFFER_IS_TRACED)
+ {
+ urpf_trace_t *t;
+
+ t = vlib_add_trace (vm, node, b[0], sizeof (*t));
+ t->urpf = lb0->lb_urpf;
+ }
+ b++;
+ next++;
+ n_left--;
+ }
+
+ vlib_buffer_enqueue_to_next (vm, node, from, nexts, frame->n_vectors);
+
+ return frame->n_vectors;
+}
+
+#endif
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */
Code Review / vpp.git / blobdiff