--- /dev/null
+/*
+ * BIRD -- Multi-Threaded Routing Toolkit (MRT) Protocol
+ *
+ * (c) 2017--2018 Ondrej Zajicek <santiago@crfreenet.org>
+ * (c) 2017--2018 CZ.NIC z.s.p.o.
+ *
+ * Can be freely distributed and used under the terms of the GNU GPL.
+ */
+
+/**
+ * DOC: Multi-Threaded Routing Toolkit (MRT) protocol
+ *
+ * The MRT protocol is implemented in just one file: |mrt.c|. It contains of
+ * several parts: Generic functions for preparing MRT messages in a buffer,
+ * functions for MRT table dump (called from timer or CLI), functions for MRT
+ * BGP4MP dump (called from BGP), and the usual protocol glue. For the MRT table
+ * dump, the key structure is struct mrt_table_dump_state, which contains all
+ * necessary data and created when the MRT dump cycle is started for the
+ * duration of the MRT dump. The MBGP4MP dump is currently not bound to MRT
+ * protocol instance and uses the config->mrtdump_file fd.
+ *
+ * The protocol is simple, just periodically scans routing table and export it
+ * to a file. It does not use the regular update mechanism, but a direct access
+ * in order to handle iteration through multiple routing tables. The table dump
+ * needs to dump all peers first and then use indexes to address the peers, we
+ * use a hash table (@peer_hash) to find peer index based on BGP protocol key
+ * attributes.
+ *
+ * One thing worth documenting is the locking. During processing, the currently
+ * processed table (@table field in the state structure) is locked and also the
+ * explicitly named table is locked (@table_ptr field in the state structure) if
+ * specified. Between dumps no table is locked. Also the current config is
+ * locked (by config_add_obstacle()) during table dumps as some data (strings,
+ * filters) are shared from the config and the running table dump may be
+ * interrupted by reconfiguration.
+ *
+ * Supported standards:
+ * - RFC 6396 - MRT format standard
+ * - RFC 8050 - ADD_PATH extension
+ */
+
+#include <unistd.h>
+#include <limits.h>
+#include <errno.h>
+
+#include "mrt.h"
+
+#include "nest/cli.h"
+#include "filter/filter.h"
+#include "proto/bgp/bgp.h"
+#include "sysdep/unix/unix.h"
+
+
+#ifdef PATH_MAX
+#define BIRD_PATH_MAX PATH_MAX
+#else
+#define BIRD_PATH_MAX 4096
+#endif
+
+#define mrt_log(s, msg, args...) \
+ ({ \
+ if (s->cli) \
+ cli_printf(s->cli, -8009, msg, ## args); \
+ if (s->proto) \
+ log(L_ERR "%s: " msg, s->proto->p.name, ## args); \
+ })
+
+
+/*
+ * MRT buffer code
+ */
+
+static void
+mrt_buffer_init(buffer *b, pool *pool, size_t n)
+{
+ b->start = mb_alloc(pool, n);
+ b->pos = b->start;
+ b->end = b->start + n;
+}
+
+static void
+mrt_buffer_grow(buffer *b, size_t n)
+{
+ size_t used = b->pos - b->start;
+ size_t size = b->end - b->start;
+ size_t req = used + n;
+
+ while (size < req)
+ size = size * 3 / 2;
+
+ b->start = mb_realloc(b->start, size);
+ b->pos = b->start + used;
+ b->end = b->start + size;
+}
+
+static inline void
+mrt_buffer_need(buffer *b, size_t n)
+{
+ if (b->pos + n > b->end)
+ mrt_buffer_grow(b, n);
+}
+
+static inline uint
+mrt_buffer_pos(buffer *b)
+{
+ return b->pos - b->start;
+}
+
+static inline void
+mrt_buffer_flush(buffer *b)
+{
+ b->pos = b->start;
+}
+
+#define MRT_DEFINE_TYPE(S, T) \
+ static inline void mrt_put_##S##_(buffer *b, T x) \
+ { \
+ put_##S(b->pos, x); \
+ b->pos += sizeof(T); \
+ } \
+ \
+ static inline void mrt_put_##S(buffer *b, T x) \
+ { \
+ mrt_buffer_need(b, sizeof(T)); \
+ put_##S(b->pos, x); \
+ b->pos += sizeof(T); \
+ }
+
+MRT_DEFINE_TYPE(u8, u8)
+MRT_DEFINE_TYPE(u16, u16)
+MRT_DEFINE_TYPE(u32, u32)
+MRT_DEFINE_TYPE(u64, u64)
+MRT_DEFINE_TYPE(ip4, ip4_addr)
+MRT_DEFINE_TYPE(ip6, ip6_addr)
+
+static inline void
+mrt_put_ipa(buffer *b, ip_addr x)
+{
+ if (ipa_is_ip4(x))
+ mrt_put_ip4(b, ipa_to_ip4(x));
+ else
+ mrt_put_ip6(b, ipa_to_ip6(x));
+}
+
+static inline void
+mrt_put_data(buffer *b, const void *src, size_t n)
+{
+ if (!n)
+ return;
+
+ mrt_buffer_need(b, n);
+ memcpy(b->pos, src, n);
+ b->pos += n;
+}
+
+static void
+mrt_init_message(buffer *b, u16 type, u16 subtype)
+{
+ /* Reset buffer */
+ mrt_buffer_flush(b);
+ mrt_buffer_need(b, MRT_HDR_LENGTH);
+
+ /* Prepare header */
+ mrt_put_u32_(b, now_real);
+ mrt_put_u16_(b, type);
+ mrt_put_u16_(b, subtype);
+
+ /* Message length, will be fixed later */
+ mrt_put_u32_(b, 0);
+}
+
+static void
+mrt_dump_message(buffer *b, int fd)
+{
+ uint len = mrt_buffer_pos(b);
+
+ /* Fix message length */
+ ASSERT(len >= MRT_HDR_LENGTH);
+ put_u32(b->start + 8, len - MRT_HDR_LENGTH);
+
+ if (fd < 0)
+ return;
+
+ if (write(fd, b->start, len) < 0)
+ log(L_ERR "Write to MRT file failed: %m"); /* TODO: name of file */
+}
+
+static int
+bstrsub(char *dst, size_t n, const char *src, const char *key, const char *val)
+{
+ const char *last, *next;
+ char *pos = dst;
+ size_t step, klen = strlen(key), vlen = strlen(val);
+
+ for (last = src; next = strstr(last, key); last = next + klen)
+ {
+ step = next - last;
+ if (n <= step + vlen)
+ return 0;
+
+ memcpy(pos, last, step);
+ ADVANCE(pos, n, step);
+
+ memcpy(pos, val, vlen);
+ ADVANCE(pos, n, vlen);
+ }
+
+ step = strlen(last);
+ if (n <= step)
+ return 0;
+
+ memcpy(pos, last, step);
+ ADVANCE(pos, n, step);
+
+ pos[0] = 0;
+ return 1;
+}
+
+static inline rtable *
+mrt_next_table_(rtable *tab, rtable *tab_ptr, const char *pattern)
+{
+ /* Handle explicit table, return it in the first pass */
+ if (tab_ptr)
+ return !tab ? tab_ptr : NULL;
+
+ /* Walk routing_tables list, starting after tab (if non-NULL) */
+ for (tab = !tab ? HEAD(routing_tables) : NODE_NEXT(tab);
+ NODE_VALID(tab);
+ tab = NODE_NEXT(tab))
+ if (patmatch(pattern, tab->name))
+ return tab;
+
+ return NULL;
+}
+
+static rtable *
+mrt_next_table(struct mrt_table_dump_state *s)
+{
+ rtable *tab = mrt_next_table_(s->table, s->table_ptr, s->table_expr);
+
+ if (s->table)
+ rt_unlock_table(s->table);
+
+ s->table = tab;
+
+ if (s->table)
+ rt_lock_table(s->table);
+
+ return s->table;
+}
+
+static int
+mrt_open_file(struct mrt_table_dump_state *s)
+{
+ char fmt1[BIRD_PATH_MAX];
+ char name[BIRD_PATH_MAX];
+
+ if (!bstrsub(fmt1, sizeof(fmt1), s->filename, "%N", s->table->name) ||
+ !tm_format_real_time(name, sizeof(name), fmt1, now_real))
+ {
+ mrt_log(s, "Invalid filename '%s'", s->filename);
+ return 0;
+ }
+
+ s->file = rf_open(s->pool, name, "a");
+ if (!s->file)
+ {
+ mrt_log(s, "Unable to open MRT file '%s': %m", name);
+ return 0;
+ }
+
+ s->fd = rf_fileno(s->file);
+ s->time_offset = now_real - now;
+
+ return 1;
+}
+
+static void
+mrt_close_file(struct mrt_table_dump_state *s)
+{
+ rfree(s->file);
+ s->file = NULL;
+ s->fd = -1;
+}
+
+
+/*
+ * MRT Table Dump: Peer Index Table
+ */
+
+#define PEER_KEY(n) n->peer_id, n->peer_as, n->peer_ip
+#define PEER_NEXT(n) n->next
+#define PEER_EQ(id1,as1,ip1,id2,as2,ip2) \
+ id1 == id2 && as1 == as2 && ipa_equal(ip1, ip2)
+#define PEER_FN(id,as,ip) ipa_hash(ip)
+
+static void
+mrt_peer_table_header(struct mrt_table_dump_state *s, u32 router_id, const char *name)
+{
+ buffer *b = &s->buf;
+
+ /* Collector BGP ID */
+ mrt_put_u32(b, router_id);
+
+ /* View Name */
+ uint name_length = name ? strlen(name) : 0;
+ name_length = MIN(name_length, 65535);
+ mrt_put_u16(b, name_length);
+ mrt_put_data(b, name, name_length);
+
+ /* Peer Count, will be fixed later */
+ s->peer_count = 0;
+ s->peer_count_offset = mrt_buffer_pos(b);
+ mrt_put_u16(b, 0);
+
+ HASH_INIT(s->peer_hash, s->pool, 10);
+}
+
+static void
+mrt_peer_table_entry(struct mrt_table_dump_state *s, u32 peer_id, u32 peer_as, ip_addr peer_ip)
+{
+ buffer *b = &s->buf;
+
+ uint type = MRT_PEER_TYPE_32BIT_ASN;
+ if (ipa_is_ip6(peer_ip))
+ type |= MRT_PEER_TYPE_IPV6;
+
+ /* Dump peer to buffer */
+ mrt_put_u8(b, type);
+ mrt_put_u32(b, peer_id);
+ mrt_put_ipa(b, peer_ip);
+ mrt_put_u32(b, peer_as);
+
+ /* Add peer to hash table */
+ struct mrt_peer_entry *n = lp_allocz(s->peer_lp, sizeof(struct mrt_peer_entry));
+ n->peer_id = peer_id;
+ n->peer_as = peer_as;
+ n->peer_ip = peer_ip;
+ n->index = s->peer_count++;
+
+ HASH_INSERT(s->peer_hash, PEER, n);
+}
+
+static void
+mrt_peer_table_dump(struct mrt_table_dump_state *s)
+{
+ mrt_init_message(&s->buf, MRT_TABLE_DUMP_V2, MRT_PEER_INDEX_TABLE);
+ mrt_peer_table_header(s, config->router_id, s->table->name);
+
+ /* 0 is fake peer for non-BGP routes */
+ mrt_peer_table_entry(s, 0, 0, IPA_NONE);
+
+#ifdef CONFIG_BGP
+ struct proto *P;
+ WALK_LIST(P, active_proto_list)
+ if (P->proto == &proto_bgp)
+ {
+ struct bgp_proto *p = (void *) P;
+ mrt_peer_table_entry(s, p->remote_id, p->remote_as, p->cf->remote_ip);
+ }
+#endif
+
+ /* Fix Peer Count */
+ put_u16(s->buf.start + s->peer_count_offset, s->peer_count);
+
+ mrt_dump_message(&s->buf, s->fd);
+}
+
+static void
+mrt_peer_table_flush(struct mrt_table_dump_state *s)
+{
+ lp_flush(s->peer_lp);
+ HASH_FREE(s->peer_hash);
+}
+
+
+/*
+ * MRT Table Dump: RIB Table
+ */
+
+static void
+mrt_rib_table_header(struct mrt_table_dump_state *s, net *n)
+{
+ buffer *b = &s->buf;
+
+ /* Sequence Number */
+ mrt_put_u32(b, s->seqnum);
+
+ /* Network Prefix */
+ ip_addr a = n->n.prefix;
+ ipa_hton(a);
+
+ mrt_put_u8(b, n->n.pxlen);
+ mrt_put_data(b, &a, BYTES(n->n.pxlen));
+
+ /* Entry Count, will be fixed later */
+ s->entry_count = 0;
+ s->entry_count_offset = mrt_buffer_pos(b);
+ mrt_put_u16(b, 0);
+}
+
+static void
+mrt_rib_table_entry(struct mrt_table_dump_state *s, rte *r, struct ea_list *tmpa)
+{
+ buffer *b = &s->buf;
+ uint peer = 0;
+
+#ifdef CONFIG_BGP
+ /* Find peer index */
+ if (r->attrs->src->proto->proto == &proto_bgp)
+ {
+ struct bgp_proto *p = (void *) r->attrs->src->proto;
+ struct mrt_peer_entry *n =
+ HASH_FIND(s->peer_hash, PEER, p->remote_id, p->remote_as, p->cf->remote_ip);
+
+ peer = n ? n->index : 0;
+ }
+#endif
+
+ /* Peer Index and Originated Time */
+ mrt_put_u16(b, peer);
+ mrt_put_u32(b, r->lastmod + s->time_offset);
+
+ /* Path Identifier */
+ if (s->add_path)
+ mrt_put_u32(b, r->attrs->src->private_id);
+
+ /* Route Attributes */
+ mrt_put_u16(b, 0);
+
+#ifdef CONFIG_BGP
+ if (r->attrs->eattrs || tmpa)
+ {
+ struct ea_list *eattrs = r->attrs->eattrs;
+
+ if (!rta_is_cached(r->attrs) || tmpa)
+ {
+ /* Attributes must be merged and sorted for bgp_encode_attrs() */
+ tmpa = ea_append(tmpa, eattrs);
+ eattrs = alloca(ea_scan(tmpa));
+ ea_merge(tmpa, eattrs);
+ ea_sort(eattrs);
+ }
+
+ mrt_buffer_need(b, MRT_ATTR_BUFFER_SIZE);
+ int alen = bgp_encode_attrs(NULL, b->pos, eattrs, MRT_ATTR_BUFFER_SIZE);
+
+ if (alen < 0)
+ {
+ mrt_log(s, "Attribute list too long for %I/%d",
+ r->net->n.prefix, r->net->n.pxlen);
+ alen = 0;
+ }
+
+ put_u16(b->pos - 2, alen);
+ b->pos += alen;
+ }
+#endif
+
+ s->entry_count++;
+}
+
+static void
+mrt_rib_table_dump(struct mrt_table_dump_state *s, net *n, int add_path)
+{
+ rte *rt, *rt0;
+ int subtype;
+
+ s->add_path = add_path;
+
+#ifndef IPV6
+ subtype = !add_path ? MRT_RIB_IPV4_UNICAST : MRT_RIB_IPV4_UNICAST_ADDPATH;
+#else
+ subtype = !add_path ? MRT_RIB_IPV6_UNICAST : MRT_RIB_IPV6_UNICAST_ADDPATH;
+#endif
+
+ mrt_init_message(&s->buf, MRT_TABLE_DUMP_V2, subtype);
+ mrt_rib_table_header(s, n);
+
+ for (rt0 = n->routes; rt = rt0; rt0 = rt0->next)
+ {
+ if (rte_is_filtered(rt))
+ continue;
+
+ /* Skip routes that should be reported in the other phase */
+ if (!s->always_add_path && (!rt->attrs->src->private_id != !s->add_path))
+ {
+ s->want_add_path = 1;
+ continue;
+ }
+
+ struct ea_list *tmp_attrs = rte_make_tmp_attrs(rt, s->linpool);
+
+ if (f_run(s->filter, &rt, &tmp_attrs, s->linpool, 0) <= F_ACCEPT)
+ mrt_rib_table_entry(s, rt, tmp_attrs);
+
+ if (rt != rt0)
+ rte_free(rt);
+
+ lp_flush(s->linpool);
+ }
+
+ /* Fix Entry Count */
+ put_u16(s->buf.start + s->entry_count_offset, s->entry_count);
+
+ /* Update max counter */
+ s->max -= 1 + s->entry_count;
+
+ /* Skip empty entries */
+ if (!s->entry_count)
+ return;
+
+ s->seqnum++;
+ mrt_dump_message(&s->buf, s->fd);
+}
+
+
+/*
+ * MRT Table Dump: main logic
+ */
+
+static struct mrt_table_dump_state *
+mrt_table_dump_init(pool *pp)
+{
+ pool *pool = rp_new(pp, "MRT Table Dump");
+ struct mrt_table_dump_state *s = mb_allocz(pool, sizeof(struct mrt_table_dump_state));
+
+ s->pool = pool;
+ s->linpool = lp_new(pool, 4080);
+ s->peer_lp = lp_new(pool, 4080);
+ mrt_buffer_init(&s->buf, pool, 2 * MRT_ATTR_BUFFER_SIZE);
+
+ /* We lock the current config as we may reference it indirectly by filter */
+ s->config = config;
+ config_add_obstacle(s->config);
+
+ s->fd = -1;
+
+ return s;
+}
+
+static void
+mrt_table_dump_free(struct mrt_table_dump_state *s)
+{
+ if (s->table_open)
+ FIB_ITERATE_UNLINK(&s->fit, &s->table->fib);
+
+ if (s->table)
+ rt_unlock_table(s->table);
+
+ if (s->table_ptr)
+ rt_unlock_table(s->table_ptr);
+
+ config_del_obstacle(s->config);
+
+ rfree(s->pool);
+}
+
+
+static int
+mrt_table_dump_step(struct mrt_table_dump_state *s)
+{
+ s->max = 2048;
+
+ if (s->table_open)
+ goto step;
+
+ while (mrt_next_table(s))
+ {
+ if (!mrt_open_file(s))
+ continue;
+
+ mrt_peer_table_dump(s);
+
+ FIB_ITERATE_INIT(&s->fit, &s->table->fib);
+ s->table_open = 1;
+
+ step:
+ FIB_ITERATE_START(&s->table->fib, &s->fit, fn)
+ {
+ if (s->max < 0)
+ {
+ FIB_ITERATE_PUT(&s->fit, fn);
+ return 0;
+ }
+
+ /* With Always ADD_PATH option, we jump directly to second phase */
+ s->want_add_path = s->always_add_path;
+
+ if (s->want_add_path == 0)
+ mrt_rib_table_dump(s, (net *) fn, 0);
+
+ if (s->want_add_path == 1)
+ mrt_rib_table_dump(s, (net *) fn, 1);
+ }
+ FIB_ITERATE_END(fn);
+ s->table_open = 0;
+
+ mrt_close_file(s);
+ mrt_peer_table_flush(s);
+ }
+
+ return 1;
+}
+
+static void
+mrt_timer(timer *t)
+{
+ struct mrt_proto *p = t->data;
+ struct mrt_config *cf = (void *) (p->p.cf);
+
+ if (p->table_dump)
+ {
+ log(L_WARN "%s: Earlier RIB table dump still not finished, skipping next one", p->p.name);
+ return;
+ }
+
+ TRACE(D_EVENTS, "RIB table dump started");
+
+ struct mrt_table_dump_state *s = mrt_table_dump_init(p->p.pool);
+
+ s->proto = p;
+ s->table_expr = cf->table_expr;
+ s->table_ptr = cf->table_cf ? cf->table_cf->table : NULL;
+ s->filter = cf->filter;
+ s->filename = cf->filename;
+ s->always_add_path = cf->always_add_path;
+
+ if (s->table_ptr)
+ rt_lock_table(s->table_ptr);
+
+ p->table_dump = s;
+ ev_schedule(p->event);
+}
+
+static void
+mrt_event(void *P)
+{
+ struct mrt_proto *p = P;
+
+ if (!p->table_dump)
+ return;
+
+ if (!mrt_table_dump_step(p->table_dump))
+ {
+ ev_schedule(p->event);
+ return;
+ }
+
+ mrt_table_dump_free(p->table_dump);
+ p->table_dump = NULL;
+
+ TRACE(D_EVENTS, "RIB table dump done");
+
+ if (p->p.proto_state == PS_STOP)
+ proto_notify_state(&p->p, PS_DOWN);
+}
+
+
+/*
+ * MRT Table Dump: CLI command
+ */
+
+static void
+mrt_dump_cont(struct cli *c)
+{
+ if (!mrt_table_dump_step(c->rover))
+ return;
+
+ cli_printf(c, 0, "");
+ c->cont = c->cleanup = NULL;
+}
+
+static void
+mrt_dump_cleanup(struct cli *c)
+{
+ mrt_table_dump_free(c->rover);
+ c->rover = NULL;
+}
+
+void
+mrt_dump_cmd(struct mrt_dump_data *d)
+{
+ if (cli_access_restricted())
+ return;
+
+ if (!d->table_expr && !d->table_ptr)
+ cf_error("Table not specified");
+
+ if (!d->filename)
+ cf_error("File not specified");
+
+ struct mrt_table_dump_state *s = mrt_table_dump_init(this_cli->pool);
+
+ s->cli = this_cli;
+ s->table_expr = d->table_expr;
+ s->table_ptr = d->table_ptr;
+ s->filter = d->filter;
+ s->filename = d->filename;
+
+ if (s->table_ptr)
+ rt_lock_table(s->table_ptr);
+
+ this_cli->cont = mrt_dump_cont;
+ this_cli->cleanup = mrt_dump_cleanup;
+ this_cli->rover = s;
+}
+
+
+/*
+ * MRT BGP4MP dump
+ */
+
+static buffer *
+mrt_bgp_buffer(void)
+{
+ /* Static buffer for BGP4MP dump, TODO: change to use MRT protocol */
+ static buffer b;
+
+ if (!b.start)
+ mrt_buffer_init(&b, &root_pool, 1024);
+
+ return &b;
+}
+
+static void
+mrt_bgp_header(buffer *b, struct mrt_bgp_data *d)
+{
+ if (d->as4)
+ {
+ mrt_put_u32(b, d->peer_as);
+ mrt_put_u32(b, d->local_as);
+ }
+ else
+ {
+ mrt_put_u16(b, (d->peer_as <= 0xFFFF) ? d->peer_as : AS_TRANS);
+ mrt_put_u16(b, (d->local_as <= 0xFFFF) ? d->local_as : AS_TRANS);
+ }
+
+ mrt_put_u16(b, (d->index <= 0xFFFF) ? d->index : 0);
+ mrt_put_u16(b, d->af);
+
+ if (d->af == BGP_AF_IPV4)
+ {
+ mrt_put_ip4(b, ipa_to_ip4(d->peer_ip));
+ mrt_put_ip4(b, ipa_to_ip4(d->local_ip));
+ }
+ else
+ {
+ mrt_put_ip6(b, ipa_to_ip6(d->peer_ip));
+ mrt_put_ip6(b, ipa_to_ip6(d->local_ip));
+ }
+}
+
+void
+mrt_dump_bgp_message(struct mrt_bgp_data *d)
+{
+ const u16 subtypes[] = {
+ MRT_BGP4MP_MESSAGE, MRT_BGP4MP_MESSAGE_AS4,
+ MRT_BGP4MP_MESSAGE_LOCAL, MRT_BGP4MP_MESSAGE_AS4_LOCAL,
+ MRT_BGP4MP_MESSAGE_ADDPATH, MRT_BGP4MP_MESSAGE_AS4_ADDPATH,
+ MRT_BGP4MP_MESSAGE_LOCAL_ADDPATH, MRT_BGP4MP_MESSAGE_AS4_LOCAL_ADDPATH,
+ };
+
+ buffer *b = mrt_bgp_buffer();
+ mrt_init_message(b, MRT_BGP4MP, subtypes[d->as4 + 4*d->add_path]);
+ mrt_bgp_header(b, d);
+ mrt_put_data(b, d->message, d->msg_len);
+ mrt_dump_message(b, config->mrtdump_file);
+}
+
+void
+mrt_dump_bgp_state_change(struct mrt_bgp_data *d)
+{
+ /* Convert state from our BS_* values to values used in MRTDump */
+ const u16 states[BS_MAX] = {1, 2, 3, 4, 5, 6, 1};
+
+ if (states[d->old_state] == states[d->new_state])
+ return;
+
+ /* Always use AS4 mode for STATE_CHANGE */
+ d->as4 = 1;
+
+ buffer *b = mrt_bgp_buffer();
+ mrt_init_message(b, MRT_BGP4MP, MRT_BGP4MP_STATE_CHANGE_AS4);
+ mrt_bgp_header(b, d);
+ mrt_put_u16(b, states[d->old_state]);
+ mrt_put_u16(b, states[d->new_state]);
+ mrt_dump_message(b, config->mrtdump_file);
+}
+
+
+/*
+ * MRT protocol glue
+ */
+
+void
+mrt_check_config(struct proto_config *C)
+{
+ struct mrt_config *cf = (void *) C;
+
+ /* c.table must be always defined, but it is relevant only if table_expr is not set */
+ if (!cf->table_expr)
+ cf->table_cf = cf->c.table;
+
+ if (!cf->table_expr && !cf->table_cf)
+ cf_error("Table not specified");
+
+ if (!cf->filename)
+ cf_error("File not specified");
+
+ if (!cf->period)
+ cf_error("Period not specified");
+}
+
+static struct proto *
+mrt_init(struct proto_config *C)
+{
+ struct proto *P = proto_new(C, sizeof(struct mrt_proto));
+
+ return P;
+}
+
+static int
+mrt_start(struct proto *P)
+{
+ struct mrt_proto *p = (void *) P;
+ struct mrt_config *cf = (void *) (P->cf);
+
+ p->timer = tm_new_set(P->pool, mrt_timer, p, 0, cf->period);
+ p->event = ev_new_set(P->pool, mrt_event, p);
+
+ tm_start(p->timer, cf->period);
+
+ return PS_UP;
+}
+
+static int
+mrt_shutdown(struct proto *P)
+{
+ struct mrt_proto *p = (void *) P;
+
+ return p->table_dump ? PS_STOP : PS_DOWN;
+}
+
+static int
+mrt_reconfigure(struct proto *P, struct proto_config *CF)
+{
+ struct mrt_proto *p = (void *) P;
+ struct mrt_config *old = (void *) (P->cf);
+ struct mrt_config *new = (void *) CF;
+
+ if (new->period != old->period)
+ {
+ TRACE(D_EVENTS, "Changing period from %d to %d s", old->period, new->period);
+
+ bird_clock_t new_time = p->timer->expires - old->period + new->period;
+ tm_start(p->timer, (new_time > now) ? (new_time - now) : 0);
+ p->timer->recurrent = new->period;
+ }
+
+ return 1;
+}
+
+static void
+mrt_copy_config(struct proto_config *dest, struct proto_config *src)
+{
+ /* Just a shallow copy, not many items here */
+ proto_copy_rest(dest, src, sizeof(struct mrt_config));
+}
+
+
+struct protocol proto_mrt = {
+ .name = "MRT",
+ .template = "mrt%d",
+ .config_size = sizeof(struct mrt_config),
+ .init = mrt_init,
+ .start = mrt_start,
+ .shutdown = mrt_shutdown,
+ .reconfigure = mrt_reconfigure,
+ .copy_config = mrt_copy_config,
+};
projects / thirdparty / bird.git / commitdiff
