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-rw-r--r--vnet/vnet/ipsec/ipsec_input.c406
1 files changed, 406 insertions, 0 deletions
diff --git a/vnet/vnet/ipsec/ipsec_input.c b/vnet/vnet/ipsec/ipsec_input.c
new file mode 100644
index 00000000000..abb4a47485a
--- /dev/null
+++ b/vnet/vnet/ipsec/ipsec_input.c
@@ -0,0 +1,406 @@
+/*
+ * 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/ipsec/ipsec.h>
+#include <vnet/ipsec/esp.h>
+
+#define foreach_ipsec_input_next \
+_(DROP, "error-drop") \
+_(ESP_DECRYPT, "esp-decrypt")
+
+#define _(v, s) IPSEC_INPUT_NEXT_##v,
+typedef enum {
+ foreach_ipsec_input_next
+#undef _
+ IPSEC_INPUT_N_NEXT,
+} ipsec_input_next_t;
+
+
+#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 _
+};
+
+vlib_node_registration_t ipsec_input_node;
+
+typedef struct {
+ u32 tunnel_index;
+ 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->tunnel_index != ~0)
+ {
+ s = format (s, "esp: tunnel %u spi %u seq %u", t->tunnel_index, t->spi, t->seq);
+ }
+ else
+ {
+ s = format (s, "esp: no tunnel 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 uword
+ipsec_input_ip4_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ ip4_main_t * i4m = &ip4_main;
+ ip_lookup_main_t * lm = &i4m->lookup_main;
+ ip_config_main_t * cm = &lm->rx_config_mains[VNET_UNICAST];
+ 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;
+ u32 tunnel_index0 = ~0;
+ ipsec_spd_t * spd0;
+
+ 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_get_config_data (&cm->config_main,
+ &vnet_buffer (b0)->ip.current_config_index,
+ &next0, 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
+ ipsec_policy_t * p0;
+ 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)->output_features.ipsec_sad_index = p0->sa_index;
+ next0 = IPSEC_INPUT_NEXT_ESP_DECRYPT;
+ 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));
+ tr->tunnel_index = tunnel_index0;
+ 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;
+}
+
+
+VLIB_REGISTER_NODE (ipsec_input_ip4_node) = {
+ .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 _
+ },
+};
+
+
+static uword
+ipsec_input_ip6_node_fn (vlib_main_t * vm,
+ vlib_node_runtime_t * node,
+ vlib_frame_t * from_frame)
+{
+ ip6_main_t * i6m = &ip6_main;
+ ip_lookup_main_t * lm = &i6m->lookup_main;
+ ip_config_main_t * cm = &lm->rx_config_mains[VNET_UNICAST];
+ 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;
+ u32 tunnel_index0 = ~0;
+ ipsec_spd_t * spd0;
+ 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_get_config_data (&cm->config_main,
+ &vnet_buffer (b0)->ip.current_config_index,
+ &next0, 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
+ ipsec_policy_t * p0;
+ 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)->output_features.ipsec_sad_index = p0->sa_index;
+ next0 = IPSEC_INPUT_NEXT_ESP_DECRYPT;
+ 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));
+ tr->tunnel_index = tunnel_index0;
+ 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;
+}
+
+
+VLIB_REGISTER_NODE (ipsec_input_ip6_node) = {
+ .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,
+
+ .n_next_nodes = IPSEC_INPUT_N_NEXT,
+ .next_nodes = {
+#define _(s,n) [IPSEC_INPUT_NEXT_##s] = n,
+ foreach_ipsec_input_next
+#undef _
+ },
+};