/* * MPLS packet format * * Copyright (c) 2012 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 included_vnet_mpls_packet_h #define included_vnet_mpls_packet_h #include <vnet/ip/ip_packet.h> /** * A label value only, i.e. 20bits. */ typedef u32 mpls_label_t; typedef struct { /* Label: top 20 bits [in network byte order] */ /* Experimental: 3 bits ... */ /* S (bottom of label stack): 1 bit */ /* TTL: 8 bits */ mpls_label_t label_exp_s_ttl; } mpls_unicast_header_t; typedef enum mpls_eos_bit_t_ { MPLS_NON_EOS = 0, MPLS_EOS = 1, } mpls_eos_bit_t; #define MPLS_EOS_BITS { \ [MPLS_NON_EOS] = "neos", \ [MPLS_EOS] = "eos", \ } /** * The Default TTL added to MPLS label headers when no other value is available */ #define MPLS_LABEL_DEFAULT_TTL 64 /** * The Default EXP added to MPLS label headers when no other value is available */ #define MPLS_LABEL_DEFAULT_EXP 0 /** * When in uniform mode convert an IPv[46] DSCP value to an MPLS EXP value */ static inline u8 ip_dscp_to_mpls_exp (ip_dscp_t tos) { return (tos >> 5); } /** * When in uniform mode convert an MPLS EXP value to an IPv[46] DSCP value */ static inline u8 mpls_exp_to_ip_dscp (u8 exp) { return (exp << 5); } #define FOR_EACH_MPLS_EOS_BIT(_eos) \ for (_eos = MPLS_NON_EOS; _eos <= MPLS_EOS; _eos++) #define MPLS_ENTRY_LABEL_OFFSET 0 #define MPLS_ENTRY_LABEL_SHIFT 12 #define MPLS_ENTRY_LABEL_MASK 0x000fffff #define MPLS_ENTRY_LABEL_BITS \ (MPLS_ENTRY_LABEL_MASK << MPLS_ENTRY_LABEL_SHIFT) #define MPLS_ENTRY_EXP_OFFSET 2 /* byte offset to EXP bits */ #define MPLS_ENTRY_EXP_SHIFT 9 #define MPLS_ENTRY_EXP_MASK 0x07 #define MPLS_ENTRY_EXP(mpls) \ (((mpls)>>MPLS_ENTRY_EXP_SHIFT) & MPLS_ENTRY_EXP_MASK) #define MPLS_ENTRY_EXP_BITS \ (MPLS_ENTRY_EXP_MASK << MPLS_ENTRY_EXP_SHIFT) #define MPLS_ENTRY_EOS_OFFSET 2 /* byte offset to EOS bit */ #define MPLS_ENTRY_EOS_SHIFT 8 #define MPLS_ENTRY_EOS_MASK 0x01 /* EOS bit in its byte */ #define MPLS_ENTRY_EOS(mpls) \ (((mpls) >> MPLS_ENTRY_EOS_SHIFT) & MPLS_ENTRY_EOS_MASK) #define MPLS_ENTRY_EOS_BIT (MPLS_ENTRY_EOS_MASK << MPLS_ENTRY_EOS_SHIFT) #define MPLS_ENTRY_TTL_OFFSET 3 /* byte offset to ttl field */ #define MPLS_ENTRY_TTL_SHIFT 0 #define MPLS_ENTRY_TTL_MASK 0xff #define MPLS_ENTRY_TTL(mpls) \ (((mpls) >> MPLS_ENTRY_TTL_SHIFT) & MPLS_ENTRY_TTL_MASK) #define MPLS_ENTRY_TTL_BITS \ (MPLS_ENTRY_TTL_MASK << MPLS_ENTRY_TTL_SHIFT) static inline u32 vnet_mpls_uc_get_label (mpls_label_t label_exp_s_ttl) { return (label_exp_s_ttl>>MPLS_ENTRY_LABEL_SHIFT); } static inline u32 vnet_mpls_uc_get_exp (mpls_label_t label_exp_s_ttl) { return (MPLS_ENTRY_EXP(label_exp_s_ttl)); } static inline u32 vnet_mpls_uc_get_s (mpls_label_t label_exp_s_ttl) { return (MPLS_ENTRY_EOS(label_exp_s_ttl)); } static inline u32 vnet_mpls_uc_get_ttl (mpls_label_t label_exp_s_ttl) { return (MPLS_ENTRY_TTL(label_exp_s_ttl)); } static inline void vnet_mpls_uc_set_label (mpls_label_t *label_exp_s_ttl, u32 value) { *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_LABEL_BITS)) | ((value & MPLS_ENTRY_LABEL_MASK) << MPLS_ENTRY_LABEL_SHIFT)); } static inline void vnet_mpls_uc_set_exp (mpls_label_t *label_exp_s_ttl, u32 exp) { *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EXP_BITS)) | ((exp & MPLS_ENTRY_EXP_MASK) << MPLS_ENTRY_EXP_SHIFT)); } static inline void vnet_mpls_uc_set_s (mpls_label_t *label_exp_s_ttl, u32 eos) { *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_EOS_BIT)) | ((eos & MPLS_ENTRY_EOS_MASK) << MPLS_ENTRY_EOS_SHIFT)); } static inline void vnet_mpls_uc_set_ttl (mpls_label_t *label_exp_s_ttl, u32 ttl) { *label_exp_s_ttl = (((*label_exp_s_ttl) & ~(MPLS_ENTRY_TTL_BITS)) | ((ttl & MPLS_ENTRY_TTL_MASK))); } #endif /* included_vnet_mpls_packet_h */