/* * decap.c - decapsulate VXLAN GPE * * Copyright (c) 2013 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 Functions for decapsulating VXLAN GPE tunnels * */ #include #include #include /** * @brief Struct for VXLAN GPE decap packet tracing * */ typedef struct { u32 next_index; u32 tunnel_index; u32 error; } vxlan_gpe_rx_trace_t; /** * @brief Tracing function for VXLAN GPE packet decapsulation * * @param *s * @param *args * * @return *s * */ static u8 * format_vxlan_gpe_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 *); vxlan_gpe_rx_trace_t *t = va_arg (*args, vxlan_gpe_rx_trace_t *); if (t->tunnel_index != ~0) { s = format (s, "VXLAN-GPE: tunnel %d next %d error %d", t->tunnel_index, t->next_index, t->error); } else { s = format (s, "VXLAN-GPE: no tunnel next %d error %d\n", t->next_index, t->error); } return s; } /** * @brief Tracing function for VXLAN GPE packet decapsulation including length * * @param *s * @param *args * * @return *s * */ static u8 * format_vxlan_gpe_with_length (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 *); return s; } /** * @brief Common processing for IPv4 and IPv6 VXLAN GPE decap dispatch functions * * It is worth noting that other than trivial UDP forwarding (transit), VXLAN GPE * tunnels are "terminate local". This means that there is no "TX" interface for this * decap case, so that field in the buffer_metadata can be "used for something else". * The something else in this case is, for the IPv4/IPv6 inner-packet type case, the * FIB index used to look up the inner-packet's adjacency. * * vnet_buffer(b0)->sw_if_index[VLIB_TX] = t0->decap_fib_index; * * @param *vm * @param *node * @param *from_frame * @param is_ip4 * * @return from_frame->n_vectors * */ always_inline uword vxlan_gpe_input (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * from_frame, u8 is_ip4) { u32 n_left_from, next_index, *from, *to_next; vxlan_gpe_main_t *nngm = &vxlan_gpe_main; vnet_main_t *vnm = nngm->vnet_main; vnet_interface_main_t *im = &vnm->interface_main; u32 last_tunnel_index = ~0; vxlan4_gpe_tunnel_key_t last_key4; vxlan6_gpe_tunnel_key_t last_key6; u32 ip4_pkts_decapsulated = 0; u32 ip6_pkts_decapsulated = 0; u32 thread_index = vm->thread_index; u32 stats_sw_if_index, stats_n_packets, stats_n_bytes; if (is_ip4) clib_memset (&last_key4, 0xff, sizeof (last_key4)); else clib_memset (&last_key6, 0xff, sizeof (last_key6)); from = vlib_frame_vector_args (from_frame); n_left_from = from_frame->n_vectors; next_index = node->cached_next_index; stats_sw_if_index = node->runtime_data[0]; stats_n_packets = stats_n_bytes = 0; 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; u32 next0, next1; ip4_vxlan_gpe_header_t *iuvn4_0, *iuvn4_1; ip6_vxlan_gpe_header_t *iuvn6_0, *iuvn6_1; uword *p0, *p1; u32 tunnel_index0, tunnel_index1; vxlan_gpe_tunnel_t *t0, *t1; vxlan4_gpe_tunnel_key_t key4_0, key4_1; vxlan6_gpe_tunnel_key_t key6_0, key6_1; u32 error0, error1; u32 sw_if_index0, sw_if_index1, len0, len1; /* 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, 2 * CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, 2 * CLIB_CACHE_LINE_BYTES, 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); if (is_ip4) { /* udp leaves current_data pointing at the vxlan-gpe header */ vlib_buffer_advance (b0, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t))); vlib_buffer_advance (b1, -(word) (sizeof (udp_header_t) + sizeof (ip4_header_t))); iuvn4_0 = vlib_buffer_get_current (b0); iuvn4_1 = vlib_buffer_get_current (b1); /* pop (ip, udp, vxlan) */ vlib_buffer_advance (b0, sizeof (*iuvn4_0)); vlib_buffer_advance (b1, sizeof (*iuvn4_1)); } else { /* udp leaves current_data pointing at the vxlan-gpe header */ vlib_buffer_advance (b0, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t))); vlib_buffer_advance (b1, -(word) (sizeof (udp_header_t) + sizeof (ip6_header_t))); iuvn6_0 = vlib_buffer_get_current (b0); iuvn6_1 = vlib_buffer_get_current (b1); /* pop (ip, udp, vxlan) */ vlib_buffer_advance (b0, sizeof (*iuvn6_0)); vlib_buffer_advance (b1, sizeof (*iuvn6_1)); } tunnel_index0 = ~0; tunnel_index1 = ~0; error0 = 0; error1 = 0; if (is_ip4) { next0 = (iuvn4_0->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ? nngm->decap_next_node_list[iuvn4_0->vxlan.protocol] : VXLAN_GPE_INPUT_NEXT_DROP; next1 = (iuvn4_1->vxlan.protocol < VXLAN_GPE_PROTOCOL_MAX) ? nngm->decap_next_node_list[iuvn4_1->vxlan.protocol] : VXLAN_GPE_INPUT_NEXT_DROP; key4_0.local = iuvn4_0->ip4.dst_address.as_u32; key4_1.local = iuvn4_1->ip4.dst_address.as_u32; key4_0.remote = iuvn4_0->ip4.src_address.as_u32; key4_1.remote = iuvn4_1->ip4.src_address.as_u32; key4_0.vni = iuvn4_0->vxlan.vni_res; key4_1.vni = iuvn4_1->vxlan.vni_res; key4_0.pad = 0; key4_1.pad = 0; } else /* is_ip6 */ { next0 = (iuvn6_0->vxlan.protocol < node->n_next_nodes) ? iuvn6_0->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP; next1 = (iuvn6_1->vxlan.protocol < node->n_next_nodes) ? iuvn6_1->vxlan.protocol : VXLAN_GPE_INPUT_NEXT_DROP; key6_0.local.as_u64[0] = iuvn6_0->ip6.dst_address.as_u64[0]; key6_0.local.as_u64[1] = iuvn6_0->ip6.dst_address.as_u64[1]; key6_1.local.as_u64[0] = iuvn6_1->ip6.dst_address.as_u64[0]; key6_1.local.as_u64[1] = iuvn6_1->ip6.dst_address.as_u64[1]; key6_0.remote.as_u64[0] = iuvn6_0->ip6.src_address.as_u64[0]; key6_0.remote.as_u64[1] = iuvn6_0->ip6.src_address.as_u64[1]; key6_1.remote.as_u64[0] = iuvn6_1->ip6.src_address.as_u64[0]; key6_1.remote.as_u64[1] = iuvn6_1->ip6.src_address.as_u64[1]; key6_0.vni = iuvn6_0->vxlan.vni_res; key6_1.vni = iuvn6_1->vxlan.vni_res; 
/*
 * Copyright (c) 2017 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.
 */

#ifndef SRC_VNET_SESSION_SESSION_TABLE_H_
#define SRC_VNET_SESSION_SESSION_TABLE_H_

#include <vppinfra/bihash_16_8.h>
#include <vppinfra/bihash_48_8.h>
#include <vnet/session/session_rules_table.h>

typedef struct _session_lookup_table
{
  /**
   * Lookup tables for established sessions and listeners
   */
  clib_bihash_16_8_t v4_session_hash;
  clib_bihash_48_8_t v6_session_hash;

  /**
   * Lookup tables for half-open sessions
   */
  clib_bihash_16_8_t v4_half_open_hash;
  clib_bihash_48_8_t v6_half_open_hash;

  /**
   * Per fib proto and transport proto session rules tables
   */
  session_rules_table_t session_rules[TRANSPORT_N_PROTO];

  /** Flag that indicates if table has local scope */
  u8 is_local;

  /** Namespace this table belongs to */
  u32 appns_index;

  /** For global tables only one fib proto is active. This is a
   * byproduct of fib table ids not necessarily being the same for
   * identical fib idices of v4 and v6 fib protos */
  u8 active_fib_proto;
  /* Required for pool_get_aligned(...) */
    CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
} session_table_t;

#define SESSION_TABLE_INVALID_INDEX ((u32)~0)
#define SESSION_LOCAL_TABLE_PREFIX ((u32)~0)
#define SESSION_INVALID_INDEX ((u32)~0)
#define SESSION_INVALID_HANDLE ((u64)~0)
#define SESSION_DROP_HANDLE (((u64)~0) - 1)

typedef int (*ip4_session_table_walk_fn_t) (clib_bihash_kv_16_8_t * kvp,
					    void *ctx);

void ip4_session_table_walk_cb (clib_bihash_kv_16_8_t * kvp, void *arg);
void ip4_session_table_walk (clib_bihash_16_8_t * hash,
			     ip4_session_table_walk_fn_t fn, void *arg);

session_table_t *session_table_alloc (void);
session_table_t *session_table_get (u32 table_index);
u32 session_table_index (session_table_t * slt);
void session_table_init (session_table_t * slt, u8 fib_proto);

/* Internal, try not to use it! */
session_table_t *_get_session_tables ();

#define session_table_foreach(VAR, BODY)		\
  pool_foreach(VAR, _get_session_tables (), BODY)

#endif /* SRC_VNET_SESSION_SESSION_TABLE_H_ */
/* *INDENT-ON* */
/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */
vnet_feature_next (&next1, b1); if (is_ip4) { proto0 = ip40->protocol; proto1 = ip41->protocol; } else { proto0 = ip60->protocol; proto1 = ip61->protocol; } /* Process packet 0 */ if (proto0 != IP_PROTOCOL_UDP) goto exit0; /* not UDP packet */ if (is_ip4) udp0 = ip4_next_header (ip40); else udp0 = ip6_next_header (ip60); if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE)) goto exit0; /* not VXLAN packet */ /* Validate DIP against VTEPs */ if (is_ip4) { if (addr4.as_u32 != ip40->dst_address.as_u32) { if (!hash_get (ngm->vtep4, ip40->dst_address.as_u32)) goto exit0; /* no local VTEP for VXLAN packet */ addr4 = ip40->dst_address; } } else { if (!ip6_address_is_equal (&addr6, &ip60->dst_address)) { if (!hash_get_mem (ngm->vtep6, &ip60->dst_address)) goto exit0; /* no local VTEP for VXLAN packet */ addr6 = ip60->dst_address; } } flags0 = b0->flags; good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp0 |= udp0->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len0 = clib_net_to_host_u16 (ip40->length); else ip_len0 = clib_net_to_host_u16 (ip60->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp0)) { if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { if (is_ip4) flags0 = ip4_tcp_udp_validate_checksum (vm, b0); else flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0); good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } } if (is_ip4) { error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH; } else { error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH; } next0 = error0 ? IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN; b0->error = error0 ? error_node->errors[error0] : 0; /* vxlan_gpe-input node expect current at VXLAN header */ if (is_ip4) vlib_buffer_advance (b0, sizeof (ip4_header_t) + sizeof (udp_header_t)); else vlib_buffer_advance (b0, sizeof (ip6_header_t) + sizeof (udp_header_t)); exit0: /* Process packet 1 */ if (proto1 != IP_PROTOCOL_UDP) goto exit1; /* not UDP packet */ if (is_ip4) udp1 = ip4_next_header (ip41); else udp1 = ip6_next_header (ip61); if (udp1->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE)) goto exit1; /* not VXLAN packet */ /* Validate DIP against VTEPs */ if (is_ip4) { if (addr4.as_u32 != ip41->dst_address.as_u32) { if (!hash_get (ngm->vtep4, ip41->dst_address.as_u32)) goto exit1; /* no local VTEP for VXLAN packet */ addr4 = ip41->dst_address; } } else { if (!ip6_address_is_equal (&addr6, &ip61->dst_address)) { if (!hash_get_mem (ngm->vtep6, &ip61->dst_address)) goto exit1; /* no local VTEP for VXLAN packet */ addr6 = ip61->dst_address; } } flags1 = b1->flags; good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp1 |= udp1->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len1 = clib_net_to_host_u16 (ip41->length); else ip_len1 = clib_net_to_host_u16 (ip61->payload_length); udp_len1 = clib_net_to_host_u16 (udp1->length); len_diff1 = ip_len1 - udp_len1; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp1)) { if ((flags1 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { if (is_ip4) flags1 = ip4_tcp_udp_validate_checksum (vm, b1); else flags1 = ip6_tcp_udp_icmp_validate_checksum (vm, b1); good_udp1 = (flags1 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } } if (is_ip4) { error1 = good_udp1 ? 0 : IP4_ERROR_UDP_CHECKSUM; error1 = (len_diff1 >= 0) ? error1 : IP4_ERROR_UDP_LENGTH; } else { error1 = good_udp1 ? 0 : IP6_ERROR_UDP_CHECKSUM; error1 = (len_diff1 >= 0) ? error1 : IP6_ERROR_UDP_LENGTH; } next1 = error1 ? IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN; b1->error = error1 ? error_node->errors[error1] : 0; /* vxlan_gpe-input node expect current at VXLAN header */ if (is_ip4) vlib_buffer_advance (b1, sizeof (ip4_header_t) + sizeof (udp_header_t)); else vlib_buffer_advance (b1, sizeof (ip6_header_t) + sizeof (udp_header_t)); exit1: 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) { vlib_buffer_t *b0; ip4_header_t *ip40; ip6_header_t *ip60; udp_header_t *udp0; u32 bi0, ip_len0, udp_len0, flags0, next0; i32 len_diff0; u8 error0, good_udp0, proto0; 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); if (is_ip4) ip40 = vlib_buffer_get_current (b0); else ip60 = vlib_buffer_get_current (b0); /* Setup packet for next IP feature */ vnet_feature_next (&next0, b0); if (is_ip4) proto0 = ip40->protocol; else proto0 = ip60->protocol; if (proto0 != IP_PROTOCOL_UDP) goto exit; /* not UDP packet */ if (is_ip4) udp0 = ip4_next_header (ip40); else udp0 = ip6_next_header (ip60); if (udp0->dst_port != clib_host_to_net_u16 (UDP_DST_PORT_VXLAN_GPE)) goto exit; /* not VXLAN packet */ /* Validate DIP against VTEPs */ if (is_ip4) { if (addr4.as_u32 != ip40->dst_address.as_u32) { if (!hash_get (ngm->vtep4, ip40->dst_address.as_u32)) goto exit; /* no local VTEP for VXLAN packet */ addr4 = ip40->dst_address; } } else { if (!ip6_address_is_equal (&addr6, &ip60->dst_address)) { if (!hash_get_mem (ngm->vtep6, &ip60->dst_address)) goto exit; /* no local VTEP for VXLAN packet */ addr6 = ip60->dst_address; } } flags0 = b0->flags; good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; /* Don't verify UDP checksum for packets with explicit zero checksum. */ good_udp0 |= udp0->checksum == 0; /* Verify UDP length */ if (is_ip4) ip_len0 = clib_net_to_host_u16 (ip40->length); else ip_len0 = clib_net_to_host_u16 (ip60->payload_length); udp_len0 = clib_net_to_host_u16 (udp0->length); len_diff0 = ip_len0 - udp_len0; /* Verify UDP checksum */ if (PREDICT_FALSE (!good_udp0)) { if ((flags0 & VNET_BUFFER_F_L4_CHECKSUM_COMPUTED) == 0) { if (is_ip4) flags0 = ip4_tcp_udp_validate_checksum (vm, b0); else flags0 = ip6_tcp_udp_icmp_validate_checksum (vm, b0); good_udp0 = (flags0 & VNET_BUFFER_F_L4_CHECKSUM_CORRECT) != 0; } } if (is_ip4) { error0 = good_udp0 ? 0 : IP4_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP4_ERROR_UDP_LENGTH; } else { error0 = good_udp0 ? 0 : IP6_ERROR_UDP_CHECKSUM; error0 = (len_diff0 >= 0) ? error0 : IP6_ERROR_UDP_LENGTH; } next0 = error0 ? IP_VXLAN_BYPASS_NEXT_DROP : IP_VXLAN_BYPASS_NEXT_VXLAN; b0->error = error0 ? error_node->errors[error0] : 0; /* vxlan_gpe-input node expect current at VXLAN header */ if (is_ip4) vlib_buffer_advance (b0, sizeof (ip4_header_t) + sizeof (udp_header_t)); else vlib_buffer_advance (b0, sizeof (ip6_header_t) + sizeof (udp_header_t)); exit: 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); } return frame->n_vectors; } VLIB_NODE_FN (ip4_vxlan_gpe_bypass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_vxlan_gpe_bypass_inline (vm, node, frame, /* is_ip4 */ 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip4_vxlan_gpe_bypass_node) = { .name = "ip4-vxlan-gpe-bypass", .vector_size = sizeof (u32), .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT, .next_nodes = { [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop", [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan4-gpe-input", }, .format_buffer = format_ip4_header, .format_trace = format_ip4_forward_next_trace, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT /* Dummy init function to get us linked in. */ clib_error_t * ip4_vxlan_gpe_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip4_vxlan_gpe_bypass_init); #endif /* CLIB_MARCH_VARIANT */ VLIB_NODE_FN (ip6_vxlan_gpe_bypass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return ip_vxlan_gpe_bypass_inline (vm, node, frame, /* is_ip4 */ 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (ip6_vxlan_gpe_bypass_node) = { .name = "ip6-vxlan-gpe-bypass", .vector_size = sizeof (u32), .n_next_nodes = IP_VXLAN_BYPASS_N_NEXT, .next_nodes = { [IP_VXLAN_BYPASS_NEXT_DROP] = "error-drop", [IP_VXLAN_BYPASS_NEXT_VXLAN] = "vxlan6-gpe-input", }, .format_buffer = format_ip6_header, .format_trace = format_ip6_forward_next_trace, }; /* *INDENT-ON* */ #ifndef CLIB_MARCH_VARIANT /* Dummy init function to get us linked in. */ clib_error_t * ip6_vxlan_gpe_bypass_init (vlib_main_t * vm) { return 0; } VLIB_INIT_FUNCTION (ip6_vxlan_gpe_bypass_init); #endif /* CLIB_MARCH_VARIANT */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */