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git.ipfire.org Git - thirdparty/bird.git/blob - nest/route.h
2 * BIRD Internet Routing Daemon -- Routing Table
4 * (c) 1998--2000 Martin Mares <mj@ucw.cz>
6 * Can be freely distributed and used under the terms of the GNU GPL.
10 #define _BIRD_ROUTE_H_
12 #include "lib/lists.h"
13 #include "lib/resource.h"
25 * Generic data structure for storing network prefixes. Also used
26 * for the master routing table. Currently implemented as a hash
29 * Available operations:
30 * - insertion of new entry
32 * - searching for entry by network prefix
33 * - asynchronous retrieval of fib contents
37 struct fib_node
*next
; /* Next in hash chain */
38 struct fib_iterator
*readers
; /* List of readers of this node */
39 byte flags
; /* User-defined, will be removed */
43 struct fib_iterator
{ /* See lib/slists.h for an explanation */
44 struct fib_iterator
*prev
, *next
; /* Must be synced with struct fib_node! */
45 byte efef
; /* 0xff to distinguish between iterator and node */
47 struct fib_node
*node
; /* Or NULL if freshly merged */
51 typedef void (*fib_init_fn
)(void *);
54 pool
*fib_pool
; /* Pool holding all our data */
55 slab
*fib_slab
; /* Slab holding all fib nodes */
56 struct fib_node
**hash_table
; /* Node hash table */
57 uint hash_size
; /* Number of hash table entries (a power of two) */
58 uint hash_order
; /* Binary logarithm of hash_size */
59 uint hash_shift
; /* 32 - hash_order */
60 uint addr_type
; /* Type of address data stored in fib (NET_*) */
61 uint node_size
; /* FIB node size, 0 for nonuniform */
62 uint node_offset
; /* Offset of fib_node struct inside of user data */
63 uint entries
; /* Number of entries */
64 uint entries_min
, entries_max
; /* Entry count limits (else start rehashing) */
65 fib_init_fn init
; /* Constructor */
68 static inline void * fib_node_to_user(struct fib
*f
, struct fib_node
*e
)
69 { return e
? (void *) ((char *) e
- f
->node_offset
) : NULL
; }
71 static inline struct fib_node
* fib_user_to_node(struct fib
*f
, void *e
)
72 { return e
? (void *) ((char *) e
+ f
->node_offset
) : NULL
; }
74 void fib_init(struct fib
*f
, pool
*p
, uint addr_type
, uint node_size
, uint node_offset
, uint hash_order
, fib_init_fn init
);
75 void *fib_find(struct fib
*, const net_addr
*); /* Find or return NULL if doesn't exist */
76 void *fib_get_chain(struct fib
*f
, const net_addr
*a
); /* Find first node in linked list from hash table */
77 void *fib_get(struct fib
*, const net_addr
*); /* Find or create new if nonexistent */
78 void *fib_route(struct fib
*, const net_addr
*); /* Longest-match routing lookup */
79 void fib_delete(struct fib
*, void *); /* Remove fib entry */
80 void fib_free(struct fib
*); /* Destroy the fib */
81 void fib_check(struct fib
*); /* Consistency check for debugging */
83 void fit_init(struct fib_iterator
*, struct fib
*); /* Internal functions, don't call */
84 struct fib_node
*fit_get(struct fib
*, struct fib_iterator
*);
85 void fit_put(struct fib_iterator
*, struct fib_node
*);
86 void fit_put_next(struct fib
*f
, struct fib_iterator
*i
, struct fib_node
*n
, uint hpos
);
89 #define FIB_WALK(fib, type, z) do { \
90 struct fib_node *fn_, **ff_ = (fib)->hash_table; \
91 uint count_ = (fib)->hash_size; \
94 for (fn_ = *ff_++; z = fib_node_to_user(fib, fn_); fn_=fn_->next)
96 #define FIB_WALK_END } while (0)
98 #define FIB_ITERATE_INIT(it, fib) fit_init(it, fib)
100 #define FIB_ITERATE_START(fib, it, type, z) do { \
101 struct fib_node *fn_ = fit_get(fib, it); \
102 uint count_ = (fib)->hash_size; \
103 uint hpos_ = (it)->hash; \
108 if (++hpos_ >= count_) \
110 fn_ = (fib)->hash_table[hpos_]; \
113 z = fib_node_to_user(fib, fn_);
115 #define FIB_ITERATE_END fn_ = fn_->next; } } while(0)
117 #define FIB_ITERATE_PUT(it) fit_put(it, fn_)
119 #define FIB_ITERATE_PUT_NEXT(it, fib) fit_put_next(fib, it, fn_, hpos_)
121 #define FIB_ITERATE_UNLINK(it, fib) fit_get(fib, it)
125 * Master Routing Tables. Generally speaking, each of them contains a FIB
126 * with each entry pointing to a list of route entries representing routes
127 * to given network (with the selected one at the head).
129 * Each of the RTE's contains variable data (the preference and protocol-dependent
130 * metrics) and a pointer to a route attribute block common for many routes).
132 * It's guaranteed that there is at most one RTE for every (prefix,proto) pair.
135 struct rtable_config
{
138 struct rtable
*table
;
139 struct proto_config
*krt_attached
; /* Kernel syncer attached to this table */
140 uint addr_type
; /* Type of address data stored in table (NET_*) */
141 int gc_max_ops
; /* Maximum number of operations before GC is run */
142 int gc_min_time
; /* Minimum time between two consecutive GC runs */
143 byte sorted
; /* Routes of network are sorted according to rte_better() */
146 typedef struct rtable
{
147 node n
; /* Node in list of all tables */
149 char *name
; /* Name of this table */
150 list channels
; /* List of attached channels (struct channel) */
151 uint addr_type
; /* Type of address data stored in table (NET_*) */
152 int pipe_busy
; /* Pipe loop detection */
153 int use_count
; /* Number of protocols using this table */
154 u32 rt_count
; /* Number of routes in the table */
155 struct hostcache
*hostcache
;
156 struct rtable_config
*config
; /* Configuration of this table */
157 struct config
*deleted
; /* Table doesn't exist in current configuration,
158 * delete as soon as use_count becomes 0 and remove
159 * obstacle from this routing table.
161 struct event
*rt_event
; /* Routing table event */
162 btime gc_time
; /* Time of last GC */
163 int gc_counter
; /* Number of operations since last GC */
164 byte prune_state
; /* Table prune state, 1 -> scheduled, 2-> running */
165 byte hcu_scheduled
; /* Hostcache update is scheduled */
166 byte nhu_state
; /* Next Hop Update state */
167 struct fib_iterator prune_fit
; /* Rtable prune FIB iterator */
168 struct fib_iterator nhu_fit
; /* Next Hop Update FIB iterator */
172 #define NHU_SCHEDULED 1
173 #define NHU_RUNNING 2
176 typedef struct network
{
177 struct rte
*routes
; /* Available routes for this network */
178 struct fib_node n
; /* FIB flags reserved for kernel syncer */
182 slab
*slab
; /* Slab holding all hostentries */
183 struct hostentry
**hash_table
; /* Hash table for hostentries */
184 unsigned hash_order
, hash_shift
;
185 unsigned hash_max
, hash_min
;
187 linpool
*lp
; /* Linpool for trie */
188 struct f_trie
*trie
; /* Trie of prefixes that might affect hostentries */
189 list hostentries
; /* List of all hostentries */
190 byte update_hostcache
;
195 ip_addr addr
; /* IP address of host, part of key */
196 ip_addr link
; /* (link-local) IP address of host, used as gw
197 if host is directly attached */
198 struct rtable
*tab
; /* Dependent table, part of key */
199 struct hostentry
*next
; /* Next in hash chain */
200 unsigned hash_key
; /* Hash key */
201 unsigned uc
; /* Use count */
202 struct rta
*src
; /* Source rta entry */
203 byte dest
; /* Chosen route destination type (RTD_...) */
204 byte nexthop_linkable
; /* Nexthop list is completely non-device */
205 u32 igp_metric
; /* Chosen route IGP metric */
210 net
*net
; /* Network this RTE belongs to */
211 struct channel
*sender
; /* Channel used to send the route to the routing table */
212 struct rta
*attrs
; /* Attributes of this route */
213 byte flags
; /* Flags (REF_...) */
214 byte pflags
; /* Protocol-specific flags */
215 word pref
; /* Route preference */
216 btime lastmod
; /* Last modified */
217 union { /* Protocol-dependent data (metrics etc.) */
220 struct iface
*from
; /* Incoming iface */
221 u8 metric
; /* RIP metric */
222 u16 tag
; /* External route tag */
227 u32 metric1
, metric2
; /* OSPF Type 1 and Type 2 metrics */
228 u32 tag
; /* External route tag */
229 u32 router_id
; /* Router that originated this route */
234 u8 suppressed
; /* Used for deterministic MED comparison */
235 s8 stale
; /* Route is LLGR_STALE, -1 if unknown */
240 u16 seqno
; /* Babel seqno */
241 u16 metric
; /* Babel metric */
242 u64 router_id
; /* Babel router id */
245 struct { /* Routes generated by krt sync (both temporary and inherited ones) */
246 s8 src
; /* Alleged route source (see krt.h) */
247 u8 proto
; /* Kernel source protocol ID */
248 u8 seen
; /* Seen during last scan */
249 u8 best
; /* Best route in network, propagated to core */
250 u32 metric
; /* Kernel metric */
255 #define REF_COW 1 /* Copy this rte on write */
256 #define REF_FILTERED 2 /* Route is rejected by import filter */
257 #define REF_STALE 4 /* Route is stale in a refresh cycle */
258 #define REF_DISCARD 8 /* Route is scheduled for discard */
259 #define REF_MODIFY 16 /* Route is scheduled for modify */
261 /* Route is valid for propagation (may depend on other flags in the future), accepts NULL */
262 static inline int rte_is_valid(rte
*r
) { return r
&& !(r
->flags
& REF_FILTERED
); }
264 /* Route just has REF_FILTERED flag */
265 static inline int rte_is_filtered(rte
*r
) { return !!(r
->flags
& REF_FILTERED
); }
268 /* Types of route announcement, also used as flags */
269 #define RA_UNDEF 0 /* Undefined RA type */
270 #define RA_OPTIMAL 1 /* Announcement of optimal route change */
271 #define RA_ACCEPTED 2 /* Announcement of first accepted route */
272 #define RA_ANY 3 /* Announcement of any route change */
273 #define RA_MERGED 4 /* Announcement of optimal route merged with next ones */
275 /* Return value of preexport() callback */
276 #define RIC_ACCEPT 1 /* Accepted by protocol */
277 #define RIC_PROCESS 0 /* Process it through import filter */
278 #define RIC_REJECT -1 /* Rejected by protocol */
279 #define RIC_DROP -2 /* Silently dropped by protocol */
281 extern list routing_tables
;
285 void rt_preconfig(struct config
*);
286 void rt_commit(struct config
*new, struct config
*old
);
287 void rt_lock_table(rtable
*);
288 void rt_unlock_table(rtable
*);
289 void rt_setup(pool
*, rtable
*, struct rtable_config
*);
290 static inline net
*net_find(rtable
*tab
, const net_addr
*addr
) { return (net
*) fib_find(&tab
->fib
, addr
); }
291 static inline net
*net_find_valid(rtable
*tab
, const net_addr
*addr
)
292 { net
*n
= net_find(tab
, addr
); return (n
&& rte_is_valid(n
->routes
)) ? n
: NULL
; }
293 static inline net
*net_get(rtable
*tab
, const net_addr
*addr
) { return (net
*) fib_get(&tab
->fib
, addr
); }
294 void *net_route(rtable
*tab
, const net_addr
*n
);
295 int net_roa_check(rtable
*tab
, const net_addr
*n
, u32 asn
);
296 rte
*rte_find(net
*net
, struct rte_src
*src
);
297 rte
*rte_get_temp(struct rta
*);
298 void rte_update2(struct channel
*c
, const net_addr
*n
, rte
*new, struct rte_src
*src
);
299 /* rte_update() moved to protocol.h to avoid dependency conflicts */
300 int rt_examine(rtable
*t
, net_addr
*a
, struct proto
*p
, struct filter
*filter
);
301 rte
*rt_export_merged(struct channel
*c
, net
*net
, rte
**rt_free
, linpool
*pool
, int silent
);
302 void rt_refresh_begin(rtable
*t
, struct channel
*c
);
303 void rt_refresh_end(rtable
*t
, struct channel
*c
);
304 void rt_modify_stale(rtable
*t
, struct channel
*c
);
305 void rt_schedule_prune(rtable
*t
);
306 void rte_dump(rte
*);
307 void rte_free(rte
*);
308 rte
*rte_do_cow(rte
*);
309 static inline rte
* rte_cow(rte
*r
) { return (r
->flags
& REF_COW
) ? rte_do_cow(r
) : r
; }
310 rte
*rte_cow_rta(rte
*r
, linpool
*lp
);
311 void rt_dump(rtable
*);
312 void rt_dump_all(void);
313 int rt_feed_channel(struct channel
*c
);
314 void rt_feed_channel_abort(struct channel
*c
);
315 int rte_update_in(struct channel
*c
, const net_addr
*n
, rte
*new, struct rte_src
*src
);
316 int rt_reload_channel(struct channel
*c
);
317 void rt_reload_channel_abort(struct channel
*c
);
318 void rt_prune_sync(rtable
*t
, int all
);
319 struct rtable_config
*rt_new_table(struct symbol
*s
, uint addr_type
);
322 /* Default limit for ECMP next hops, defined in sysdep code */
323 extern const int rt_default_ecmp
;
325 struct rt_show_data_rtable
{
328 struct channel
*export_channel
;
331 struct rt_show_data
{
334 struct rt_show_data_rtable
*tab
; /* Iterator over table list */
335 struct rt_show_data_rtable
*last_table
; /* Last table in output */
336 struct fib_iterator fit
; /* Iterator over networks in table */
337 int verbose
, tables_defined_by
;
338 struct filter
*filter
;
339 struct proto
*show_protocol
;
340 struct proto
*export_protocol
;
341 struct channel
*export_channel
;
342 struct config
*running_on_config
;
343 int export_mode
, primary_only
, filtered
, stats
, show_for
;
345 int table_open
; /* Iteration (fit) is open */
346 int net_counter
, rt_counter
, show_counter
, table_counter
;
347 int net_counter_last
, rt_counter_last
, show_counter_last
;
350 void rt_show(struct rt_show_data
*);
351 struct rt_show_data_rtable
* rt_show_add_table(struct rt_show_data
*d
, rtable
*t
);
353 /* Value of table definition mode in struct rt_show_data */
354 #define RSD_TDB_DEFAULT 0 /* no table specified */
355 #define RSD_TDB_INDIRECT 0 /* show route ... protocol P ... */
356 #define RSD_TDB_ALL RSD_TDB_SET /* show route ... table all ... */
357 #define RSD_TDB_DIRECT RSD_TDB_SET | RSD_TDB_NMN /* show route ... table X table Y ... */
359 #define RSD_TDB_SET 0x1 /* internal: show empty tables */
360 #define RSD_TDB_NMN 0x2 /* internal: need matching net */
362 /* Value of export_mode in struct rt_show_data */
363 #define RSEM_NONE 0 /* Export mode not used */
364 #define RSEM_PREEXPORT 1 /* Routes ready for export, before filtering */
365 #define RSEM_EXPORT 2 /* Routes accepted by export filter */
366 #define RSEM_NOEXPORT 3 /* Routes rejected by export filter */
371 * Beware: All standard BGP attributes must be represented here instead
372 * of making them local to the route. This is needed to ensure proper
373 * construction of BGP route attribute lists.
376 /* Nexthop structure */
378 ip_addr gw
; /* Next hop */
379 struct iface
*iface
; /* Outgoing interface */
380 struct nexthop
*next
;
383 byte labels_orig
; /* Number of labels before hostentry was applied */
384 byte labels
; /* Number of all labels */
388 #define RNF_ONLINK 0x1 /* Gateway is onlink regardless of IP ranges */
392 struct rte_src
*next
; /* Hash chain */
393 struct proto
*proto
; /* Protocol the source is based on */
394 u32 private_id
; /* Private ID, assigned by the protocol */
395 u32 global_id
; /* Globally unique ID of the source */
396 unsigned uc
; /* Use count */
401 struct rta
*next
, **pprev
; /* Hash chain */
402 u32 uc
; /* Use count */
403 u32 hash_key
; /* Hash over important fields */
404 struct ea_list
*eattrs
; /* Extended Attribute chain */
405 struct rte_src
*src
; /* Route source that created the route */
406 struct hostentry
*hostentry
; /* Hostentry for recursive next-hops */
407 ip_addr from
; /* Advertising router */
408 u32 igp_metric
; /* IGP metric to next hop (for iBGP routes) */
409 u8 source
; /* Route source (RTS_...) */
410 u8 scope
; /* Route scope (SCOPE_... -- see ip.h) */
411 u8 dest
; /* Route destination type (RTD_...) */
413 struct nexthop nh
; /* Next hop */
416 #define RTS_DUMMY 0 /* Dummy route to be removed soon */
417 #define RTS_STATIC 1 /* Normal static route */
418 #define RTS_INHERIT 2 /* Route inherited from kernel */
419 #define RTS_DEVICE 3 /* Device route */
420 #define RTS_STATIC_DEVICE 4 /* Static device route */
421 #define RTS_REDIRECT 5 /* Learned via redirect */
422 #define RTS_RIP 6 /* RIP route */
423 #define RTS_OSPF 7 /* OSPF route */
424 #define RTS_OSPF_IA 8 /* OSPF inter-area route */
425 #define RTS_OSPF_EXT1 9 /* OSPF external route type 1 */
426 #define RTS_OSPF_EXT2 10 /* OSPF external route type 2 */
427 #define RTS_BGP 11 /* BGP route */
428 #define RTS_PIPE 12 /* Inter-table wormhole */
429 #define RTS_BABEL 13 /* Babel route */
430 #define RTS_RPKI 14 /* Route Origin Authorization */
434 #define RTC_UNICAST 0
435 #define RTC_BROADCAST 1
436 #define RTC_MULTICAST 2
437 #define RTC_ANYCAST 3 /* IPv6 Anycast */
439 #define RTD_NONE 0 /* Undefined next hop */
440 #define RTD_UNICAST 1 /* Next hop is neighbor router */
441 #define RTD_BLACKHOLE 2 /* Silently drop packets */
442 #define RTD_UNREACHABLE 3 /* Reject as unreachable */
443 #define RTD_PROHIBIT 4 /* Administratively prohibited */
446 /* Flags for net->n.flags, used by kernel syncer */
447 #define KRF_INSTALLED 0x80 /* This route should be installed in the kernel */
448 #define KRF_SYNC_ERROR 0x40 /* Error during kernel table synchronization */
450 #define RTAF_CACHED 1 /* This is a cached rta */
452 #define IGP_METRIC_UNKNOWN 0x80000000 /* Default igp_metric used when no other
453 protocol-specific metric is availabe */
456 const char * rta_dest_names
[RTD_MAX
];
458 static inline const char *rta_dest_name(uint n
)
459 { return (n
< RTD_MAX
) ? rta_dest_names
[n
] : "???"; }
461 /* Route has regular, reachable nexthop (i.e. not RTD_UNREACHABLE and like) */
462 static inline int rte_is_reachable(rte
*r
)
463 { return r
->attrs
->dest
== RTD_UNICAST
; }
467 * Extended Route Attributes
470 typedef struct eattr
{
471 word id
; /* EA_CODE(PROTOCOL_..., protocol-dependent ID) */
472 byte flags
; /* Protocol-dependent flags */
473 byte type
; /* Attribute type and several flags (EAF_...) */
476 struct adata
*ptr
; /* Attribute data elsewhere */
481 #define EA_CODE(proto,id) (((proto) << 8) | (id))
482 #define EA_ID(ea) ((ea) & 0xff)
483 #define EA_PROTO(ea) ((ea) >> 8)
484 #define EA_CUSTOM(id) ((id) | EA_CUSTOM_BIT)
485 #define EA_IS_CUSTOM(ea) ((ea) & EA_CUSTOM_BIT)
486 #define EA_CUSTOM_ID(ea) ((ea) & ~EA_CUSTOM_BIT)
488 const char *ea_custom_name(uint ea
);
490 #define EA_GEN_IGP_METRIC EA_CODE(PROTOCOL_NONE, 0)
492 #define EA_CODE_MASK 0xffff
493 #define EA_CUSTOM_BIT 0x8000
494 #define EA_ALLOW_UNDEF 0x10000 /* ea_find: allow EAF_TYPE_UNDEF */
495 #define EA_BIT(n) ((n) << 24) /* Used in bitfield accessors */
497 #define EAF_TYPE_MASK 0x1f /* Mask with this to get type */
498 #define EAF_TYPE_INT 0x01 /* 32-bit unsigned integer number */
499 #define EAF_TYPE_OPAQUE 0x02 /* Opaque byte string (not filterable) */
500 #define EAF_TYPE_IP_ADDRESS 0x04 /* IP address */
501 #define EAF_TYPE_ROUTER_ID 0x05 /* Router ID (IPv4 address) */
502 #define EAF_TYPE_AS_PATH 0x06 /* BGP AS path (encoding per RFC 1771:4.3) */
503 #define EAF_TYPE_BITFIELD 0x09 /* 32-bit embedded bitfield */
504 #define EAF_TYPE_INT_SET 0x0a /* Set of u32's (e.g., a community list) */
505 #define EAF_TYPE_EC_SET 0x0e /* Set of pairs of u32's - ext. community list */
506 #define EAF_TYPE_LC_SET 0x12 /* Set of triplets of u32's - large community list */
507 #define EAF_TYPE_UNDEF 0x1f /* `force undefined' entry */
508 #define EAF_EMBEDDED 0x01 /* Data stored in eattr.u.data (part of type spec) */
509 #define EAF_VAR_LENGTH 0x02 /* Attribute length is variable (part of type spec) */
510 #define EAF_ORIGINATED 0x20 /* The attribute has originated locally */
511 #define EAF_FRESH 0x40 /* An uncached attribute (e.g. modified in export filter) */
512 #define EAF_TEMP 0x80 /* A temporary attribute (the one stored in the tmp attr list) */
514 typedef struct adata
{
515 uint length
; /* Length of data */
519 static inline struct adata
*
520 lp_alloc_adata(struct linpool
*pool
, uint len
)
522 struct adata
*ad
= lp_alloc(pool
, sizeof(struct adata
) + len
);
527 static inline int adata_same(struct adata
*a
, struct adata
*b
)
528 { return (a
->length
== b
->length
&& !memcmp(a
->data
, b
->data
, a
->length
)); }
531 typedef struct ea_list
{
532 struct ea_list
*next
; /* In case we have an override list */
533 byte flags
; /* Flags: EALF_... */
535 word count
; /* Number of attributes */
536 eattr attrs
[0]; /* Attribute definitions themselves */
539 #define EALF_SORTED 1 /* Attributes are sorted by code */
540 #define EALF_BISECT 2 /* Use interval bisection for searching */
541 #define EALF_CACHED 4 /* Attributes belonging to cached rta */
543 struct rte_src
*rt_find_source(struct proto
*p
, u32 id
);
544 struct rte_src
*rt_get_source(struct proto
*p
, u32 id
);
545 static inline void rt_lock_source(struct rte_src
*src
) { src
->uc
++; }
546 static inline void rt_unlock_source(struct rte_src
*src
) { src
->uc
--; }
547 void rt_prune_sources(void);
549 struct ea_walk_state
{
550 ea_list
*eattrs
; /* Ccurrent ea_list, initially set by caller */
551 eattr
*ea
; /* Current eattr, initially NULL */
552 u32 visited
[4]; /* Bitfield, limiting max to 128 */
555 eattr
*ea_find(ea_list
*, unsigned ea
);
556 eattr
*ea_walk(struct ea_walk_state
*s
, uint id
, uint max
);
557 int ea_get_int(ea_list
*, unsigned ea
, int def
);
558 void ea_dump(ea_list
*);
559 void ea_sort(ea_list
*); /* Sort entries in all sub-lists */
560 unsigned ea_scan(ea_list
*); /* How many bytes do we need for merged ea_list */
561 void ea_merge(ea_list
*from
, ea_list
*to
); /* Merge sub-lists to allocated buffer */
562 int ea_same(ea_list
*x
, ea_list
*y
); /* Test whether two ea_lists are identical */
563 uint
ea_hash(ea_list
*e
); /* Calculate 16-bit hash value */
564 ea_list
*ea_append(ea_list
*to
, ea_list
*what
);
565 void ea_format_bitfield(struct eattr
*a
, byte
*buf
, int bufsize
, const char **names
, int min
, int max
);
567 #define ea_normalize(ea) do { \
569 ea_list *t = alloca(ea_scan(ea)); \
576 static inline eattr *
577 ea_set_attr(ea_list
**to
, struct linpool
*pool
, uint id
, uint flags
, uint type
, uintptr_t val
)
579 ea_list
*a
= lp_alloc(pool
, sizeof(ea_list
) + sizeof(eattr
));
580 eattr
*e
= &a
->attrs
[0];
582 a
->flags
= EALF_SORTED
;
591 if (type
& EAF_EMBEDDED
)
592 e
->u
.data
= (u32
) val
;
594 e
->u
.ptr
= (struct adata
*) val
;
600 ea_set_attr_u32(ea_list
**to
, struct linpool
*pool
, uint id
, uint flags
, uint type
, u32 val
)
601 { ea_set_attr(to
, pool
, id
, flags
, type
, (uintptr_t) val
); }
604 ea_set_attr_ptr(ea_list
**to
, struct linpool
*pool
, uint id
, uint flags
, uint type
, struct adata
*val
)
605 { ea_set_attr(to
, pool
, id
, flags
, type
, (uintptr_t) val
); }
608 ea_set_attr_data(ea_list
**to
, struct linpool
*pool
, uint id
, uint flags
, uint type
, void *data
, uint len
)
610 struct adata
*a
= lp_alloc_adata(pool
, len
);
611 memcpy(a
->data
, data
, len
);
612 ea_set_attr(to
, pool
, id
, flags
, type
, (uintptr_t) a
);
616 #define NEXTHOP_MAX_SIZE (sizeof(struct nexthop) + sizeof(u32)*MPLS_MAX_LABEL_STACK)
618 static inline size_t nexthop_size(const struct nexthop
*nh
)
619 { return sizeof(struct nexthop
) + sizeof(u32
)*nh
->labels
; }
620 int nexthop__same(struct nexthop
*x
, struct nexthop
*y
); /* Compare multipath nexthops */
621 static inline int nexthop_same(struct nexthop
*x
, struct nexthop
*y
)
622 { return (x
== y
) || nexthop__same(x
, y
); }
623 struct nexthop
*nexthop_merge(struct nexthop
*x
, struct nexthop
*y
, int rx
, int ry
, int max
, linpool
*lp
);
624 static inline void nexthop_link(struct rta
*a
, struct nexthop
*from
)
625 { memcpy(&a
->nh
, from
, nexthop_size(from
)); }
626 void nexthop_insert(struct nexthop
**n
, struct nexthop
*y
);
627 int nexthop_is_sorted(struct nexthop
*x
);
630 static inline size_t rta_size(const rta
*a
) { return sizeof(rta
) + sizeof(u32
)*a
->nh
.labels
; }
631 #define RTA_MAX_SIZE (sizeof(rta) + sizeof(u32)*MPLS_MAX_LABEL_STACK)
632 rta
*rta_lookup(rta
*); /* Get rta equivalent to this one, uc++ */
633 static inline int rta_is_cached(rta
*r
) { return r
->aflags
& RTAF_CACHED
; }
634 static inline rta
*rta_clone(rta
*r
) { r
->uc
++; return r
; }
635 void rta__free(rta
*r
);
636 static inline void rta_free(rta
*r
) { if (r
&& !--r
->uc
) rta__free(r
); }
637 rta
*rta_do_cow(rta
*o
, linpool
*lp
);
638 static inline rta
* rta_cow(rta
*r
, linpool
*lp
) { return rta_is_cached(r
) ? rta_do_cow(r
, lp
) : r
; }
639 void rta_dump(rta
*);
640 void rta_dump_all(void);
641 void rta_show(struct cli
*, rta
*);
643 struct hostentry
* rt_get_hostentry(rtable
*tab
, ip_addr a
, ip_addr ll
, rtable
*dep
);
644 void rta_apply_hostentry(rta
*a
, struct hostentry
*he
, mpls_label_stack
*mls
);
647 rta_set_recursive_next_hop(rtable
*dep
, rta
*a
, rtable
*tab
, ip_addr gw
, ip_addr ll
, mpls_label_stack
*mls
)
649 rta_apply_hostentry(a
, rt_get_hostentry(tab
, gw
, ll
, dep
), mls
);
653 * rta_set_recursive_next_hop() acquires hostentry from hostcache and fills
654 * rta->hostentry field. New hostentry has zero use count. Cached rta locks its
655 * hostentry (increases its use count), uncached rta does not lock it. Hostentry
656 * with zero use count is removed asynchronously during host cache update,
657 * therefore it is safe to hold such hostentry temorarily. Hostentry holds a
658 * lock for a 'source' rta, mainly to share multipath nexthops.
660 * There is no need to hold a lock for hostentry->dep table, because that table
661 * contains routes responsible for that hostentry, and therefore is non-empty if
662 * given hostentry has non-zero use count. If the hostentry has zero use count,
663 * the entry is removed before dep is referenced.
665 * The protocol responsible for routes with recursive next hops should hold a
666 * lock for a 'source' table governing that routes (argument tab to
667 * rta_set_recursive_next_hop()), because its routes reference hostentries
668 * (through rta) related to the governing table. When all such routes are
669 * removed, rtas are immediately removed achieving zero uc. Then the 'source'
670 * table lock could be immediately released, although hostentries may still
671 * exist - they will be freed together with the 'source' table.
674 static inline void rt_lock_hostentry(struct hostentry
*he
) { if (he
) he
->uc
++; }
675 static inline void rt_unlock_hostentry(struct hostentry
*he
) { if (he
) he
->uc
--; }
678 * Default protocol preferences
681 #define DEF_PREF_DIRECT 240 /* Directly connected */
682 #define DEF_PREF_STATIC 200 /* Static route */
683 #define DEF_PREF_OSPF 150 /* OSPF intra-area, inter-area and type 1 external routes */
684 #define DEF_PREF_BABEL 130 /* Babel */
685 #define DEF_PREF_RIP 120 /* RIP */
686 #define DEF_PREF_BGP 100 /* BGP */
687 #define DEF_PREF_RPKI 100 /* RPKI */
688 #define DEF_PREF_INHERITED 10 /* Routes inherited from other routing daemons */
691 * Route Origin Authorization
694 #define ROA_UNKNOWN 0
696 #define ROA_INVALID 2