Annotation of embedaddon/bird2/nest/attrs.h, revision 1.1
1.1 ! misho 1: /*
! 2: * BIRD Internet Routing Daemon -- Attribute Operations
! 3: *
! 4: * (c) 2000 Martin Mares <mj@ucw.cz>
! 5: *
! 6: * Can be freely distributed and used under the terms of the GNU GPL.
! 7: */
! 8:
! 9: #ifndef _BIRD_ATTRS_H_
! 10: #define _BIRD_ATTRS_H_
! 11:
! 12: #include <stdint.h>
! 13: #include "lib/unaligned.h"
! 14: #include "nest/route.h"
! 15:
! 16:
! 17: /* a-path.c */
! 18:
! 19: #define AS_PATH_SET 1 /* Types of path segments */
! 20: #define AS_PATH_SEQUENCE 2
! 21: #define AS_PATH_CONFED_SEQUENCE 3
! 22: #define AS_PATH_CONFED_SET 4
! 23:
! 24: #define AS_PATH_MAXLEN 10000
! 25:
! 26: #define AS_TRANS 23456
! 27: /* AS_TRANS is used when we need to store 32bit ASN larger than 0xFFFF
! 28: * to 16bit slot (like in 16bit AS_PATH). See RFC 4893 for details
! 29: */
! 30:
! 31: struct f_tree;
! 32:
! 33: int as_path_valid(byte *data, uint len, int bs, int confed, char *err, uint elen);
! 34: int as_path_16to32(byte *dst, const byte *src, uint len);
! 35: int as_path_32to16(byte *dst, const byte *src, uint len);
! 36: int as_path_contains_as4(const struct adata *path);
! 37: int as_path_contains_confed(const struct adata *path);
! 38: struct adata *as_path_strip_confed(struct linpool *pool, const struct adata *op);
! 39: struct adata *as_path_prepend2(struct linpool *pool, const struct adata *op, int seq, u32 as);
! 40: struct adata *as_path_to_old(struct linpool *pool, const struct adata *path);
! 41: struct adata *as_path_cut(struct linpool *pool, const struct adata *path, uint num);
! 42: const struct adata *as_path_merge(struct linpool *pool, const struct adata *p1, const struct adata *p2);
! 43: void as_path_format(const struct adata *path, byte *buf, uint size);
! 44: int as_path_getlen(const struct adata *path);
! 45: int as_path_getlen_int(const struct adata *path, int bs);
! 46: int as_path_get_first(const struct adata *path, u32 *orig_as);
! 47: int as_path_get_first_regular(const struct adata *path, u32 *last_as);
! 48: int as_path_get_last(const struct adata *path, u32 *last_as);
! 49: u32 as_path_get_last_nonaggregated(const struct adata *path);
! 50: int as_path_contains(const struct adata *path, u32 as, int min);
! 51: int as_path_match_set(const struct adata *path, const struct f_tree *set);
! 52: const struct adata *as_path_filter(struct linpool *pool, const struct adata *path, const struct f_tree *set, u32 key, int pos);
! 53:
! 54: static inline struct adata *as_path_prepend(struct linpool *pool, const struct adata *path, u32 as)
! 55: { return as_path_prepend2(pool, path, AS_PATH_SEQUENCE, as); }
! 56:
! 57:
! 58: #define PM_ASN 0
! 59: #define PM_QUESTION 1
! 60: #define PM_ASTERISK 2
! 61: #define PM_ASN_EXPR 3
! 62: #define PM_ASN_RANGE 4
! 63: #define PM_ASN_SET 5
! 64:
! 65: struct f_path_mask_item {
! 66: union {
! 67: u32 asn; /* PM_ASN */
! 68: const struct f_line *expr; /* PM_ASN_EXPR */
! 69: const struct f_tree *set; /* PM_ASN_SET */
! 70: struct { /* PM_ASN_RANGE */
! 71: u32 from;
! 72: u32 to;
! 73: };
! 74: };
! 75: int kind;
! 76: };
! 77:
! 78: struct f_path_mask {
! 79: uint len;
! 80: struct f_path_mask_item item[0];
! 81: };
! 82:
! 83: int as_path_match(const struct adata *path, const struct f_path_mask *mask);
! 84:
! 85:
! 86: /* Counterparts to appropriate as_path_* functions */
! 87:
! 88: static inline int
! 89: aggregator_16to32(byte *dst, const byte *src)
! 90: {
! 91: put_u32(dst, get_u16(src));
! 92: memcpy(dst+4, src+2, 4);
! 93: return 8;
! 94: }
! 95:
! 96: static inline int
! 97: aggregator_32to16(byte *dst, const byte *src)
! 98: {
! 99: put_u16(dst, get_u32(src));
! 100: memcpy(dst+2, src+4, 4);
! 101: return 6;
! 102: }
! 103:
! 104: static inline int
! 105: aggregator_contains_as4(const struct adata *a)
! 106: {
! 107: return get_u32(a->data) > 0xFFFF;
! 108: }
! 109:
! 110: static inline struct adata *
! 111: aggregator_to_old(struct linpool *pool, const struct adata *a)
! 112: {
! 113: struct adata *d = lp_alloc_adata(pool, 8);
! 114: put_u32(d->data, 0xFFFF);
! 115: memcpy(d->data + 4, a->data + 4, 4);
! 116: return d;
! 117: }
! 118:
! 119:
! 120: /* a-set.c */
! 121:
! 122:
! 123: /* Extended Community subtypes (kinds) */
! 124: enum ec_subtype {
! 125: EC_RT = 0x0002,
! 126: EC_RO = 0x0003,
! 127: EC_GENERIC = 0xFFFF,
! 128: };
! 129:
! 130: static inline const char *ec_subtype_str(const enum ec_subtype ecs) {
! 131: switch (ecs) {
! 132: case EC_RT: return "rt";
! 133: case EC_RO: return "ro";
! 134: default: return NULL;
! 135: }
! 136: }
! 137:
! 138: /* Transitive bit (for first u32 half of EC) */
! 139: #define EC_TBIT 0x40000000
! 140:
! 141: #define ECOMM_LENGTH 8
! 142:
! 143: static inline int int_set_get_size(const struct adata *list)
! 144: { return list->length / 4; }
! 145:
! 146: static inline int ec_set_get_size(const struct adata *list)
! 147: { return list->length / 8; }
! 148:
! 149: static inline int lc_set_get_size(const struct adata *list)
! 150: { return list->length / 12; }
! 151:
! 152: static inline u32 *int_set_get_data(const struct adata *list)
! 153: { return (u32 *) list->data; }
! 154:
! 155: static inline u32 ec_hi(u64 ec) { return ec >> 32; }
! 156: static inline u32 ec_lo(u64 ec) { return ec; }
! 157: static inline u64 ec_get(const u32 *l, int i)
! 158: { return (((u64) l[i]) << 32) | l[i+1]; }
! 159:
! 160: /* RFC 4360 3.1. Two-Octet AS Specific Extended Community */
! 161: static inline u64 ec_as2(enum ec_subtype kind, u64 key, u64 val)
! 162: { return (((u64) kind | 0x0000) << 48) | (key << 32) | val; }
! 163:
! 164: /* RFC 5668 4-Octet AS Specific BGP Extended Community */
! 165: static inline u64 ec_as4(enum ec_subtype kind, u64 key, u64 val)
! 166: { return (((u64) kind | 0x0200) << 48) | (key << 16) | val; }
! 167:
! 168: /* RFC 4360 3.2. IPv4 Address Specific Extended Community */
! 169: static inline u64 ec_ip4(enum ec_subtype kind, u64 key, u64 val)
! 170: { return (((u64) kind | 0x0100) << 48) | (key << 16) | val; }
! 171:
! 172: static inline u64 ec_generic(u64 key, u64 val)
! 173: { return (key << 32) | val; }
! 174:
! 175: /* Large community value */
! 176: typedef struct lcomm {
! 177: u32 asn;
! 178: u32 ldp1;
! 179: u32 ldp2;
! 180: } lcomm;
! 181:
! 182: #define LCOMM_LENGTH 12
! 183:
! 184: static inline lcomm lc_get(const u32 *l, int i)
! 185: { return (lcomm) { l[i], l[i+1], l[i+2] }; }
! 186:
! 187: static inline void lc_put(u32 *l, lcomm v)
! 188: { l[0] = v.asn; l[1] = v.ldp1; l[2] = v.ldp2; }
! 189:
! 190: static inline int lc_match(const u32 *l, int i, lcomm v)
! 191: { return (l[i] == v.asn && l[i+1] == v.ldp1 && l[i+2] == v.ldp2); }
! 192:
! 193: static inline u32 *lc_copy(u32 *dst, const u32 *src)
! 194: { memcpy(dst, src, LCOMM_LENGTH); return dst + 3; }
! 195:
! 196:
! 197: int int_set_format(const struct adata *set, int way, int from, byte *buf, uint size);
! 198: int ec_format(byte *buf, u64 ec);
! 199: int ec_set_format(const struct adata *set, int from, byte *buf, uint size);
! 200: int lc_format(byte *buf, lcomm lc);
! 201: int lc_set_format(const struct adata *set, int from, byte *buf, uint size);
! 202: int int_set_contains(const struct adata *list, u32 val);
! 203: int ec_set_contains(const struct adata *list, u64 val);
! 204: int lc_set_contains(const struct adata *list, lcomm val);
! 205: const struct adata *int_set_prepend(struct linpool *pool, const struct adata *list, u32 val);
! 206: const struct adata *int_set_add(struct linpool *pool, const struct adata *list, u32 val);
! 207: const struct adata *ec_set_add(struct linpool *pool, const struct adata *list, u64 val);
! 208: const struct adata *lc_set_add(struct linpool *pool, const struct adata *list, lcomm val);
! 209: const struct adata *int_set_del(struct linpool *pool, const struct adata *list, u32 val);
! 210: const struct adata *ec_set_del(struct linpool *pool, const struct adata *list, u64 val);
! 211: const struct adata *lc_set_del(struct linpool *pool, const struct adata *list, lcomm val);
! 212: const struct adata *int_set_union(struct linpool *pool, const struct adata *l1, const struct adata *l2);
! 213: const struct adata *ec_set_union(struct linpool *pool, const struct adata *l1, const struct adata *l2);
! 214: const struct adata *lc_set_union(struct linpool *pool, const struct adata *l1, const struct adata *l2);
! 215:
! 216: struct adata *ec_set_del_nontrans(struct linpool *pool, const struct adata *set);
! 217: struct adata *int_set_sort(struct linpool *pool, const struct adata *src);
! 218: struct adata *ec_set_sort(struct linpool *pool, const struct adata *src);
! 219: struct adata *lc_set_sort(struct linpool *pool, const struct adata *src);
! 220:
! 221: void ec_set_sort_x(struct adata *set); /* Sort in place */
! 222:
! 223: #endif
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