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-rw-r--r--src/vnet/ipsec/ipsec_input.c430
1 files changed, 430 insertions, 0 deletions
diff --git a/src/vnet/ipsec/ipsec_input.c b/src/vnet/ipsec/ipsec_input.c
new file mode 100644
index 00000000..f27058bb
--- /dev/null
+++ b/src/vnet/ipsec/ipsec_input.c
@@ -0,0 +1,430 @@
+/*
+ * decap.c : IPSec tunnel decapsulation
+ *
+ * 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.
+ */
+
+#include <vnet/vnet.h>
+#include <vnet/api_errno.h>
+#include <vnet/ip/ip.h>
+#include <vnet/feature/feature.h>
+
+#include <vnet/ipsec/ipsec.h>
+#include <vnet/ipsec/esp.h>
+
+#define foreach_ipsec_input_error \
+ _(RX_PKTS, "IPSEC pkts received") \
+ _(DECRYPTION_FAILED, "IPSEC decryption failed")
+
+typedef enum
+{
+#define _(sym,str) IPSEC_INPUT_ERROR_##sym,
+ foreach_ipsec_input_error
+#undef _
+ IPSEC_INPUT_N_ERROR,
+} ipsec_input_error_t;
+
+static char *ipsec_input_error_strings[] = {
+#define _(sym,string) string,
+ foreach_ipsec_input_error
+#undef _
+};
+
+typedef struct
+{
+ u32 sa_id;
+ u32 spi;
+ u32 seq;
+} ipsec_input_trace_t;
+
+/* packet trace format function */
+static u8 *
+format_ipsec_input_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_input_trace_t *t = va_arg (*args, ipsec_input_trace_t *);
+
+ if (t->spi == 0 && t->seq == 0)
+ {
+ s = format (s, "esp: no esp packet");
+ return s;
+ }
+
+ if (t->sa_id != 0)
+ {
+ s = format (s, "esp: sa_id %u spi %u seq %u", t->sa_id, t->spi, t->seq);
+ }
+ else
+ {
+ s = format (s, "esp: no sa spi %u seq %u", t->spi, t->seq);
+ }
+ return s;
+}
+
+always_inline ipsec_policy_t *
+ipsec_input_protect_policy_match (ipsec_spd_t * spd, u32 sa, u32 da, u32 spi)
+{
+ ipsec_main_t *im = &ipsec_main;
+ ipsec_policy_t *p;
+ ipsec_sa_t *s;
+ u32 *i;
+
+ vec_foreach (i, spd->ipv4_inbound_protect_policy_indices)
+ {
+ p = pool_elt_at_index (spd->policies, *i);
+ s = pool_elt_at_index (im->sad, p->sa_index);
+
+ if (spi != s->spi)
+ continue;
+
+ if (s->is_tunnel)
+ {
+ if (da != clib_net_to_host_u32 (s->tunnel_dst_addr.ip4.as_u32))
+ continue;
+
+ if (sa != clib_net_to_host_u32 (s->tunnel_src_addr.ip4.as_u32))
+ continue;
+
+ return p;
+ }
+
+ if (da < clib_net_to_host_u32 (p->laddr.start.ip4.as_u32))
+ continue;
+
+ if (da > clib_net_to_host_u32 (p->laddr.stop.ip4.as_u32))
+ continue;
+
+ if (sa < clib_net_to_host_u32 (p->raddr.start.ip4.as_u32))
+ continue;
+
+ if (sa > clib_net_to_host_u32 (p->raddr.stop.ip4.as_u32))
+ continue;
+
+ return p;
+ }
+ return 0;
+}
+
+always_inline uword
+ip6_addr_match_range (ip6_address_t * a, ip6_address_t * la,
+ ip6_address_t * ua)
+{
+ if ((memcmp (a->as_u64, la->as_u64, 2 * sizeof (u64)) >= 0) &&
+ (memcmp (a->as_u64, ua->as_u64, 2 * sizeof (u64)) <= 0))
+ return 1;
+ return 0;
+}
+
+always_inline ipsec_policy_t *
+ipsec_input_ip6_protect_policy_match (ipsec_spd_t * spd,
+ ip6_address_t * sa,
+ ip6_address_t * da, u32 spi)
+{
+ ipsec_main_t *im = &ipsec_main;
+ ipsec_policy_t *p;
+ ipsec_sa_t *s;
+ u32 *i;
+
+ vec_foreach (i, spd->ipv6_inbound_protect_policy_indices)
+ {
+ p = pool_elt_at_index (spd->policies, *i);
+ s = pool_elt_at_index (im->sad, p->sa_index);
+
+ if (spi != s->spi)
+ continue;
+
+ if (s->is_tunnel)
+ {
+ if (!ip6_address_is_equal (sa, &s->tunnel_src_addr.ip6))
+ continue;
+
+ if (!ip6_address_is_equal (da, &s->tunnel_dst_addr.ip6))
+ continue;
+
+ return p;
+ }
+
+ if (!ip6_addr_match_range (sa, &p->raddr.start.ip6, &p->raddr.stop.ip6))
+ continue;
+
+ if (!ip6_addr_match_range (da, &p->laddr.start.ip6, &p->laddr.stop.ip6))
+ continue;
+
+ return p;
+ }
+ return 0;
+}
+
+static vlib_node_registration_t ipsec_input_ip4_node;
+
+static uword
+ipsec_input_ip4_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, *from, next_index, *to_next;
+ ipsec_main_t *im = &ipsec_main;
+
+ 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)
+ {
+ u32 bi0, next0;
+ vlib_buffer_t *b0;
+ ip4_header_t *ip0;
+ esp_header_t *esp0;
+ ip4_ipsec_config_t *c0;
+ ipsec_spd_t *spd0;
+ ipsec_policy_t *p0 = 0;
+
+ bi0 = to_next[0] = from[0];
+ from += 1;
+ n_left_from -= 1;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ c0 =
+ vnet_feature_next_with_data (vnet_buffer (b0)->sw_if_index
+ [VLIB_RX], &next0, b0,
+ sizeof (c0[0]));
+
+ spd0 = pool_elt_at_index (im->spds, c0->spd_index);
+
+ ip0 = vlib_buffer_get_current (b0);
+ esp0 = (esp_header_t *) ((u8 *) ip0 + ip4_header_bytes (ip0));
+
+ if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
+ {
+#if 0
+ clib_warning
+ ("packet received from %U to %U spi %u size %u spd_id %u",
+ format_ip4_address, ip0->src_address.as_u8,
+ format_ip4_address, ip0->dst_address.as_u8,
+ clib_net_to_host_u32 (esp0->spi),
+ clib_net_to_host_u16 (ip0->length), spd0->id);
+#endif
+
+ p0 = ipsec_input_protect_policy_match (spd0,
+ clib_net_to_host_u32
+ (ip0->src_address.
+ as_u32),
+ clib_net_to_host_u32
+ (ip0->dst_address.
+ as_u32),
+ clib_net_to_host_u32
+ (esp0->spi));
+
+ if (PREDICT_TRUE (p0 != 0))
+ {
+ p0->counter.packets++;
+ p0->counter.bytes += clib_net_to_host_u16 (ip0->length);
+ vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
+ vnet_buffer (b0)->ipsec.flags = 0;
+ next0 = im->esp_decrypt_next_index;
+ vlib_buffer_advance (b0, ip4_header_bytes (ip0));
+ goto trace0;
+ }
+ }
+
+ /* FIXME bypass and discard */
+
+ trace0:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_input_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
+ {
+ if (p0)
+ tr->sa_id = p0->sa_id;
+ tr->spi = clib_host_to_net_u32 (esp0->spi);
+ tr->seq = clib_host_to_net_u32 (esp0->seq);
+ }
+ }
+
+ 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_input_ip4_node.index,
+ IPSEC_INPUT_ERROR_RX_PKTS,
+ from_frame->n_vectors);
+
+ return from_frame->n_vectors;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ipsec_input_ip4_node,static) = {
+ .function = ipsec_input_ip4_node_fn,
+ .name = "ipsec-input-ip4",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ipsec_input_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(ipsec_input_error_strings),
+ .error_strings = ipsec_input_error_strings,
+
+ .n_next_nodes = IPSEC_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
+ foreach_ipsec_input_next
+#undef _
+ },
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (ipsec_input_ip4_node, ipsec_input_ip4_node_fn)
+ static vlib_node_registration_t ipsec_input_ip6_node;
+
+ static uword
+ ipsec_input_ip6_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ u32 n_left_from, *from, next_index, *to_next;
+ ipsec_main_t *im = &ipsec_main;
+
+ 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)
+ {
+ u32 bi0, next0;
+ vlib_buffer_t *b0;
+ ip6_header_t *ip0;
+ esp_header_t *esp0;
+ ip4_ipsec_config_t *c0;
+ ipsec_spd_t *spd0;
+ ipsec_policy_t *p0 = 0;
+ u32 header_size = sizeof (ip0[0]);
+
+ bi0 = to_next[0] = from[0];
+ from += 1;
+ n_left_from -= 1;
+ to_next += 1;
+ n_left_to_next -= 1;
+
+ b0 = vlib_get_buffer (vm, bi0);
+ c0 =
+ vnet_feature_next_with_data (vnet_buffer (b0)->sw_if_index
+ [VLIB_RX], &next0, b0,
+ sizeof (c0[0]));
+
+ spd0 = pool_elt_at_index (im->spds, c0->spd_index);
+
+ ip0 = vlib_buffer_get_current (b0);
+ esp0 = (esp_header_t *) ((u8 *) ip0 + header_size);
+
+ if (PREDICT_TRUE (ip0->protocol == IP_PROTOCOL_IPSEC_ESP))
+ {
+#if 0
+ clib_warning
+ ("packet received from %U to %U spi %u size %u spd_id %u",
+ format_ip6_address, &ip0->src_address, format_ip6_address,
+ &ip0->dst_address, clib_net_to_host_u32 (esp0->spi),
+ clib_net_to_host_u16 (ip0->payload_length) + header_size,
+ spd0->id);
+#endif
+ p0 = ipsec_input_ip6_protect_policy_match (spd0,
+ &ip0->src_address,
+ &ip0->dst_address,
+ clib_net_to_host_u32
+ (esp0->spi));
+
+ if (PREDICT_TRUE (p0 != 0))
+ {
+ p0->counter.packets++;
+ p0->counter.bytes +=
+ clib_net_to_host_u16 (ip0->payload_length);
+ p0->counter.bytes += header_size;
+ vnet_buffer (b0)->ipsec.sad_index = p0->sa_index;
+ vnet_buffer (b0)->ipsec.flags = 0;
+ next0 = im->esp_decrypt_next_index;
+ vlib_buffer_advance (b0, header_size);
+ goto trace0;
+ }
+ }
+
+ trace0:
+ if (PREDICT_FALSE (b0->flags & VLIB_BUFFER_IS_TRACED))
+ {
+ ipsec_input_trace_t *tr =
+ vlib_add_trace (vm, node, b0, sizeof (*tr));
+ if (ip0->protocol == IP_PROTOCOL_IPSEC_ESP)
+ {
+ if (p0)
+ tr->sa_id = p0->sa_id;
+ tr->spi = clib_host_to_net_u32 (esp0->spi);
+ tr->seq = clib_host_to_net_u32 (esp0->seq);
+ }
+ }
+
+ 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_input_ip6_node.index,
+ IPSEC_INPUT_ERROR_RX_PKTS,
+ from_frame->n_vectors);
+
+ return from_frame->n_vectors;
+}
+
+
+/* *INDENT-OFF* */
+VLIB_REGISTER_NODE (ipsec_input_ip6_node,static) = {
+ .function = ipsec_input_ip6_node_fn,
+ .name = "ipsec-input-ip6",
+ .vector_size = sizeof (u32),
+ .format_trace = format_ipsec_input_trace,
+ .type = VLIB_NODE_TYPE_INTERNAL,
+
+ .n_errors = ARRAY_LEN(ipsec_input_error_strings),
+ .error_strings = ipsec_input_error_strings,
+
+ .sibling_of = "ipsec-input-ip4",
+};
+/* *INDENT-ON* */
+
+VLIB_NODE_FUNCTION_MULTIARCH (ipsec_input_ip6_node, ipsec_input_ip6_node_fn)
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */