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| -rw-r--r-- | lib/mpls.h | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/lib/mpls.h b/lib/mpls.h new file mode 100644 index 0000000..74bd7aa --- /dev/null +++ b/lib/mpls.h @@ -0,0 +1,226 @@ +/* + * MPLS definitions + * Copyright 2015 Cumulus Networks, Inc. + * + * This file is part of GNU Zebra. + * + * GNU Zebra is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published + * by the Free Software Foundation; either version 2, or (at your + * option) any later version. + * + * GNU Zebra is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef _QUAGGA_MPLS_H +#define _QUAGGA_MPLS_H + +#include <zebra.h> +#include <arpa/inet.h> + +#ifdef __cplusplus +extern "C" { +#endif + +#ifdef MPLS_LABEL_MAX +#undef MPLS_LABEL_MAX +#endif + +#define MPLS_LABEL_HELPSTR \ + "Specify label(s) for this route\nOne or more " \ + "labels in the range (16-1048575) separated by '/'\n" + +/* Well-known MPLS label values (RFC 3032 etc). */ +#define MPLS_LABEL_IPV4_EXPLICIT_NULL 0 /* [RFC3032] */ +#define MPLS_LABEL_ROUTER_ALERT 1 /* [RFC3032] */ +#define MPLS_LABEL_IPV6_EXPLICIT_NULL 2 /* [RFC3032] */ +#define MPLS_LABEL_IMPLICIT_NULL 3 /* [RFC3032] */ +#define MPLS_LABEL_ELI 7 /* [RFC6790] */ +#define MPLS_LABEL_GAL 13 /* [RFC5586] */ +#define MPLS_LABEL_OAM_ALERT 14 /* [RFC3429] */ +#define MPLS_LABEL_EXTENSION 15 /* [RFC7274] */ +#define MPLS_LABEL_MAX 1048575 +#define MPLS_LABEL_VALUE_MASK 0x000FFFFF +#define MPLS_LABEL_NONE 0xFFFFFFFF /* for internal use only */ + +/* Minimum and maximum label values */ +#define MPLS_LABEL_RESERVED_MIN 0 +#define MPLS_LABEL_RESERVED_MAX 15 +#define MPLS_LABEL_UNRESERVED_MIN 16 +#define MPLS_LABEL_UNRESERVED_MAX 1048575 +#define MPLS_LABEL_BASE_ANY 0 + +/* Default min and max SRGB label range */ +/* Even if the SRGB allows to manage different Label space between routers, + * if an operator want to use the same SRGB for all its router, we must fix + * a common range. However, Cisco start its SRGB at 16000 and Juniper ends + * its SRGB at 16384 for OSPF. Thus, by fixing the minimum SRGB label to + * 8000 we could deal with both Cisco and Juniper. + */ +#define MPLS_DEFAULT_MIN_SRGB_LABEL 8000 +#define MPLS_DEFAULT_MAX_SRGB_LABEL 50000 +#define MPLS_DEFAULT_MIN_SRGB_SIZE 5000 +#define MPLS_DEFAULT_MAX_SRGB_SIZE 20000 + +/* Maximum # labels that can be pushed. */ +#define MPLS_MAX_LABELS 16 + +#define IS_MPLS_RESERVED_LABEL(label) (label <= MPLS_LABEL_RESERVED_MAX) + +#define IS_MPLS_UNRESERVED_LABEL(label) \ + (label >= MPLS_LABEL_UNRESERVED_MIN \ + && label <= MPLS_LABEL_UNRESERVED_MAX) + +/* Definitions for a MPLS label stack entry (RFC 3032). This encodes the + * label, EXP, BOS and TTL fields. + */ +typedef unsigned int mpls_lse_t; + +#define MPLS_LS_LABEL_MASK 0xFFFFF000 +#define MPLS_LS_LABEL_SHIFT 12 +#define MPLS_LS_EXP_MASK 0x00000E00 +#define MPLS_LS_EXP_SHIFT 9 +#define MPLS_LS_S_MASK 0x00000100 +#define MPLS_LS_S_SHIFT 8 +#define MPLS_LS_TTL_MASK 0x000000FF +#define MPLS_LS_TTL_SHIFT 0 + +#define MPLS_LABEL_VALUE(lse) \ + ((lse & MPLS_LS_LABEL_MASK) >> MPLS_LS_LABEL_SHIFT) +#define MPLS_LABEL_EXP(lse) ((lse & MPLS_LS_EXP_MASK) >> MPLS_LS_EXP_SHIFT) +#define MPLS_LABEL_BOS(lse) ((lse & MPLS_LS_S_MASK) >> MPLS_LS_S_SHIFT) +#define MPLS_LABEL_TTL(lse) ((lse & MPLS_LS_TTL_MASK) >> MPLS_LS_TTL_SHIFT) + +#define IS_MPLS_LABEL_BOS(ls) (MPLS_LABEL_BOS(ls) == 1) + +#define MPLS_LABEL_LEN_BITS 20 + +/* MPLS label value as a 32-bit (mostly we only care about the label value). */ +typedef unsigned int mpls_label_t; + +struct mpls_label_stack { + uint8_t num_labels; + uint8_t reserved[3]; + mpls_label_t label[0]; /* 1 or more labels */ +}; + +/* The MPLS explicit-null label is 0 which means when you memset a mpls_label_t + * to zero you have set that variable to explicit-null which was probably not + * your intent. The work-around is to use one bit to indicate if the + * mpls_label_t has been set by the user. MPLS_INVALID_LABEL has this bit clear + * so that we can use MPLS_INVALID_LABEL to initialize mpls_label_t variables. + */ +#define MPLS_INVALID_LABEL 0xFFFDFFFF + +/* LSP types. */ +enum lsp_types_t { + ZEBRA_LSP_NONE = 0, /* No LSP. */ + ZEBRA_LSP_STATIC = 1, /* Static LSP. */ + ZEBRA_LSP_LDP = 2, /* LDP LSP. */ + ZEBRA_LSP_BGP = 3, /* BGP LSP. */ + ZEBRA_LSP_OSPF_SR = 4,/* OSPF Segment Routing LSP. */ + ZEBRA_LSP_ISIS_SR = 5,/* IS-IS Segment Routing LSP. */ + ZEBRA_LSP_SHARP = 6, /* Identifier for test protocol */ + ZEBRA_LSP_SRTE = 7, /* SR-TE LSP */ +}; + +/* Functions for basic label operations. */ + +/* Encode a label stack entry from fields; convert to network byte-order as + * the Netlink interface expects MPLS labels to be in this format. + */ +static inline mpls_lse_t mpls_lse_encode(mpls_label_t label, uint32_t ttl, + uint32_t exp, uint32_t bos) +{ + mpls_lse_t lse; + lse = htonl((label << MPLS_LS_LABEL_SHIFT) | (exp << MPLS_LS_EXP_SHIFT) + | (bos ? (1 << MPLS_LS_S_SHIFT) : 0) + | (ttl << MPLS_LS_TTL_SHIFT)); + return lse; +} + +/* Extract the fields from a label stack entry after converting to host-byte + * order. This is expected to be called only for messages received over the + * Netlink interface. + */ +static inline void mpls_lse_decode(mpls_lse_t lse, mpls_label_t *label, + uint32_t *ttl, uint32_t *exp, uint32_t *bos) +{ + mpls_lse_t local_lse; + + local_lse = ntohl(lse); + *label = MPLS_LABEL_VALUE(local_lse); + *exp = MPLS_LABEL_EXP(local_lse); + *bos = MPLS_LABEL_BOS(local_lse); + *ttl = MPLS_LABEL_TTL(local_lse); +} + +/* Invalid label index value (when used with BGP Prefix-SID). Should + * match the BGP definition. + */ +#define MPLS_INVALID_LABEL_INDEX 0xFFFFFFFF + +/* Printable string for labels (with consideration for reserved values). */ +static inline char *label2str(mpls_label_t label, char *buf, size_t len) +{ + switch (label) { + case MPLS_LABEL_IPV4_EXPLICIT_NULL: + strlcpy(buf, "IPv4 Explicit Null", len); + return (buf); + case MPLS_LABEL_ROUTER_ALERT: + strlcpy(buf, "Router Alert", len); + return (buf); + case MPLS_LABEL_IPV6_EXPLICIT_NULL: + strlcpy(buf, "IPv6 Explicit Null", len); + return (buf); + case MPLS_LABEL_IMPLICIT_NULL: + strlcpy(buf, "implicit-null", len); + return (buf); + case MPLS_LABEL_ELI: + strlcpy(buf, "Entropy Label Indicator", len); + return (buf); + case MPLS_LABEL_GAL: + strlcpy(buf, "Generic Associated Channel", len); + return (buf); + case MPLS_LABEL_OAM_ALERT: + strlcpy(buf, "OAM Alert", len); + return (buf); + case MPLS_LABEL_EXTENSION: + strlcpy(buf, "Extension", len); + return (buf); + default: + if (label < 16) + snprintf(buf, len, "Reserved (%u)", label); + else + snprintf(buf, len, "%u", label); + return (buf); + } +} + +/* + * String to label conversion, labels separated by '/'. + */ +int mpls_str2label(const char *label_str, uint8_t *num_labels, + mpls_label_t *labels); + +/* Generic string buffer for label-stack-to-str */ +#define MPLS_LABEL_STRLEN 1024 + +/* + * Label to string conversion, labels in string separated by '/'. + */ +char *mpls_label2str(uint8_t num_labels, const mpls_label_t *labels, char *buf, + int len, int pretty); + +#ifdef __cplusplus +} +#endif + +#endif |