Annotation of embedaddon/bird2/nest/attrs.h, revision 1.1.1.1
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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