/* * Copyright (c) 2016-2019 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 __UDP_ENCAP_H__ #define __UDP_ENCAP_H__ #include <vnet/ip/ip.h> #include <vnet/udp/udp_packet.h> #include <vnet/fib/fib_node.h> /** * UDP encapsulation. * A representation of the encapsulation of packets in UDP-over-IP. * This is encapsulation only, there is no tunnel interface, hence * it is uni-directional. For decap register a handler with the UDP port * dispatcher. */ /** * Fixup behaviour. Actions performed on the encap in the data-plane */ typedef enum udp_encap_fixup_flags_t_ { UDP_ENCAP_FIXUP_NONE = 0, /** * UDP source port contains an entropy/hash value for load-balancing by downstream peers. */ UDP_ENCAP_FIXUP_UDP_SRC_PORT_ENTROPY = (1 << 0), } udp_encap_fixup_flags_t; /** * The UDP encap representation */ typedef struct udp_encap_t_ { /** * The first cacheline contains the data used in the data-plane */ CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); /** * The headers to paint, in packet painting order */ union { struct { ip4_header_t ue_ip4; udp_header_t ue_udp; } __attribute__ ((packed)) ip4; struct { ip6_header_t ue_ip6; udp_header_t ue_udp; } __attribute__ ((packed)) ip6; } __attribute__ ((packed)) ue_hdrs; /** * The DPO used to forward to the next node in the VLIB graph */ dpo_id_t ue_dpo; /** * Flags controlling fixup behaviour */ udp_encap_fixup_flags_t ue_flags; /** * the protocol of the IP header imposed */ fib_protocol_t ue_ip_proto; /** * The second cacheline contains control-plane data */ CLIB_CACHE_LINE_ALIGN_MARK (cacheline1); /** * linkage into the FIB graph */ fib_node_t ue_fib_node; /** * Tracking information for the IP destination */ fib_node_index_t ue_fib_entry_index; u32 ue_fib_sibling; /** * The FIB index in which the encap destination resides */ index_t ue_fib_index; } udp_encap_t; extern index_t udp_encap_add_and_lock (fib_protocol_t proto, index_t fib_index, const ip46_address_t * src_ip, const ip46_address_t * dst_ip, u16 src_port, u16 dst_port, udp_encap_fixup_flags_t flags); extern void udp_encap_lock (index_t uei); extern void udp_encap_unlock (index_t uei); extern u8 *format_udp_encap (u8 * s, va_list * args); extern void udp_encap_contribute_forwarding (index_t uei, dpo_proto_t proto, dpo_id_t * dpo); extern void udp_encap_get_stats (index_t uei, u64 * packets, u64 * bytes); /** * Callback function invoked when walking all encap objects. * Return non-zero to continue the walk. */ typedef walk_rc_t (*udp_encap_walk_cb_t) (index_t uei, void *ctx); /** * Walk each of the encap objects */ extern void udp_encap_walk (udp_encap_walk_cb_t cb, void *ctx); /** * Pool of encaps */ extern udp_encap_t *udp_encap_pool; static inline udp_encap_t * udp_encap_get (index_t uei) { return (pool_elt_at_index (udp_encap_pool, uei)); } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */ #endif