From a92cf57dd6ba021a495fe7268c86dc8e6aeecbb2 Mon Sep 17 00:00:00 2001 From: Ondrej Zajicek Date: Wed, 26 Dec 2012 12:40:48 +0100 Subject: Implements undo command and optional timeout for configuration Several new configure command variants: configure undo - undo last reconfiguration configure timeout - configure with scheduled undo if not confirmed in timeout configure confirm - confirm last configuration configure check - just parse and validate config file --- conf/conf.c | 253 +++++++++++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 192 insertions(+), 61 deletions(-) (limited to 'conf/conf.c') diff --git a/conf/conf.c b/conf/conf.c index 9375861f..6dfa3691 100644 --- a/conf/conf.c +++ b/conf/conf.c @@ -21,9 +21,12 @@ * There can exist up to four different configurations at one time: an active * one (pointed to by @config), configuration we are just switching from * (@old_config), one queued for the next reconfiguration (@future_config; - * if it's non-%NULL and the user wants to reconfigure once again, we just + * if there is one and the user wants to reconfigure once again, we just * free the previous queued config and replace it with the new one) and - * finally a config being parsed (@new_config). + * finally a config being parsed (@new_config). The stored @old_config + * is also used for undo reconfiguration, which works in a similar way. + * Reconfiguration could also have timeout (using @config_timer) and undo + * is automatically called if the new configuration is not confirmed later. * * Loading of new configuration is very simple: just call config_alloc() * to get a new &config structure, then use config_parse() to parse a @@ -55,10 +58,23 @@ static jmp_buf conf_jmpbuf; -struct config *config, *new_config, *old_config, *future_config; -static event *config_event; -int shutting_down, future_type; -bird_clock_t boot_time; +struct config *config, *new_config; + +static struct config *old_config; /* Old configuration */ +static struct config *future_config; /* New config held here if recon requested during recon */ +static int old_cftype; /* Type of transition old_config -> config (RECONFIG_SOFT/HARD) */ +static int future_cftype; /* Type of scheduled transition, may also be RECONFIG_UNDO */ +/* Note that when future_cftype is RECONFIG_UNDO, then future_config is NULL, + therefore proper check for future scheduled config checks future_cftype */ + +static event *config_event; /* Event for finalizing reconfiguration */ +static timer *config_timer; /* Timer for scheduled configuration rollback */ + +/* These are public just for cmd_show_status(), should not be accessed elsewhere */ +int shutting_down; /* Shutdown requested, do not accept new config changes */ +int configuring; /* Reconfiguration is running */ +int undo_available; /* Undo was not requested from last reconfiguration */ +/* Note that both shutting_down and undo_available are related to requests, not processing */ /** * config_alloc - allocate a new configuration @@ -82,8 +98,6 @@ config_alloc(byte *name) c->load_time = now; c->tf_base.fmt1 = c->tf_log.fmt1 = "%d-%m-%Y %T"; - if (!boot_time) - boot_time = now; return c; } @@ -154,7 +168,8 @@ cli_parse(struct config *c) void config_free(struct config *c) { - rfree(c->pool); + if (c) + rfree(c->pool); } void @@ -170,10 +185,7 @@ config_del_obstacle(struct config *c) DBG("+++ deleting obstacle %d\n", c->obstacle_count); c->obstacle_count--; if (!c->obstacle_count) - { - ASSERT(config_event); - ev_schedule(config_event); - } + ev_schedule(config_event); } static int @@ -197,16 +209,31 @@ global_commit(struct config *new, struct config *old) static int config_do_commit(struct config *c, int type) { - int force_restart, nobs; + if (type == RECONFIG_UNDO) + { + c = old_config; + type = old_cftype; + } + else + config_free(old_config); - DBG("do_commit\n"); old_config = config; - config = new_config = c; + old_cftype = type; + config = c; + + configuring = 1; + if (old_config && !config->shutdown) + log(L_INFO "Reconfiguring"); + + /* This should not be necessary, but it seems there are some + functions that access new_config instead of config */ + new_config = config; + if (old_config) old_config->obstacle_count++; DBG("sysdep_commit\n"); - force_restart = sysdep_commit(c, old_config); + int force_restart = sysdep_commit(c, old_config); DBG("global_commit\n"); force_restart |= global_commit(c, old_config); DBG("rt_commit\n"); @@ -214,38 +241,38 @@ config_do_commit(struct config *c, int type) roa_commit(c, old_config); DBG("protos_commit\n"); protos_commit(c, old_config, force_restart, type); - new_config = NULL; /* Just to be sure nobody uses that now */ + + /* Just to be sure nobody uses that now */ + new_config = NULL; + + int obs = 0; if (old_config) - nobs = --old_config->obstacle_count; - else - nobs = 0; - DBG("do_commit finished with %d obstacles remaining\n", nobs); - return !nobs; + obs = --old_config->obstacle_count; + + DBG("do_commit finished with %d obstacles remaining\n", obs); + return !obs; } static void config_done(void *unused UNUSED) { - struct config *c; + if (config->shutdown) + sysdep_shutdown_done(); + + configuring = 0; + if (old_config) + log(L_INFO "Reconfigured"); - DBG("config_done\n"); - for(;;) + if (future_cftype) { - if (config->shutdown) - sysdep_shutdown_done(); - log(L_INFO "Reconfigured"); - if (old_config) - { - config_free(old_config); - old_config = NULL; - } - if (!future_config) - break; - c = future_config; + int type = future_cftype; + struct config *conf = future_config; + future_cftype = RECONFIG_NONE; future_config = NULL; + log(L_INFO "Reconfiguring to queued configuration"); - if (!config_do_commit(c, future_type)) - break; + if (config_do_commit(conf, type)) + config_done(NULL); } } @@ -253,6 +280,7 @@ config_done(void *unused UNUSED) * config_commit - commit a configuration * @c: new configuration * @type: type of reconfiguration (RECONFIG_SOFT or RECONFIG_HARD) + * @timeout: timeout for undo (or 0 for no timeout) * * When a configuration is parsed and prepared for use, the * config_commit() function starts the process of reconfiguration. @@ -265,6 +293,10 @@ config_done(void *unused UNUSED) * using config_del_obstacle(), the old configuration is freed and * everything runs according to the new one. * + * When @timeout is nonzero, the undo timer is activated with given + * timeout. The timer is deactivated when config_commit(), + * config_confirm() or config_undo() is called. + * * Result: %CONF_DONE if the configuration has been accepted immediately, * %CONF_PROGRESS if it will take some time to switch to it, %CONF_QUEUED * if it's been queued due to another reconfiguration being in progress now @@ -272,49 +304,147 @@ config_done(void *unused UNUSED) * are accepted. */ int -config_commit(struct config *c, int type) +config_commit(struct config *c, int type, int timeout) { - if (!config) /* First-time configuration */ + if (shutting_down) { - config_do_commit(c, RECONFIG_HARD); - return CONF_DONE; + config_free(c); + return CONF_SHUTDOWN; } - if (old_config) /* Reconfiguration already in progress */ + + undo_available = 1; + if (timeout > 0) + tm_start(config_timer, timeout); + else + tm_stop(config_timer); + + if (configuring) { - if (shutting_down == 2) - { - log(L_INFO "New configuration discarded due to shutdown"); - config_free(c); - return CONF_SHUTDOWN; - } - if (future_config) + if (future_cftype) { log(L_INFO "Queueing new configuration, ignoring the one already queued"); config_free(future_config); } else - log(L_INFO "Queued new configuration"); + log(L_INFO "Queueing new configuration"); + + future_cftype = type; future_config = c; - future_type = type; return CONF_QUEUED; } - if (!shutting_down) - log(L_INFO "Reconfiguring"); - if (config_do_commit(c, type)) { config_done(NULL); return CONF_DONE; } - if (!config_event) + return CONF_PROGRESS; +} + +/** + * config_confirm - confirm a commited configuration + * + * When the undo timer is activated by config_commit() with nonzero timeout, + * this function can be used to deactivate it and therefore confirm + * the current configuration. + * + * Result: %CONF_CONFIRM when the current configuration is confirmed, + * %CONF_NONE when there is nothing to confirm (i.e. undo timer is not active). + */ +int +config_confirm(void) +{ + if (config_timer->expires == 0) + return CONF_NOTHING; + + tm_stop(config_timer); + + return CONF_CONFIRM; +} + +/** + * config_undo - undo a configuration + * + * Function config_undo() can be used to change the current + * configuration back to stored %old_config. If no reconfiguration is + * running, this stored configuration is commited in the same way as a + * new configuration in config_commit(). If there is already a + * reconfiguration in progress and no next reconfiguration is + * scheduled, then the undo is scheduled for later processing as + * usual, but if another reconfiguration is already scheduled, then + * such reconfiguration is removed instead (i.e. undo is applied on + * the last commit that scheduled it). + * + * Result: %CONF_DONE if the configuration has been accepted immediately, + * %CONF_PROGRESS if it will take some time to switch to it, %CONF_QUEUED + * if it's been queued due to another reconfiguration being in progress now, + * %CONF_UNQUEUED if a scheduled reconfiguration is removed, %CONF_NOTHING + * if there is no relevant configuration to undo (the previous config request + * was config_undo() too) or %CONF_SHUTDOWN if BIRD is in shutdown mode and + * no new configuration changes are accepted. + */ +int +config_undo(void) +{ + if (shutting_down) + return CONF_SHUTDOWN; + + if (!undo_available || !old_config) + return CONF_NOTHING; + + undo_available = 0; + tm_stop(config_timer); + + if (configuring) { - config_event = ev_new(&root_pool); - config_event->hook = config_done; + if (future_cftype) + { + config_free(future_config); + future_config = NULL; + + log(L_INFO "Removing queued configuration"); + future_cftype = RECONFIG_NONE; + return CONF_UNQUEUED; + } + else + { + log(L_INFO "Queueing undo configuration"); + future_cftype = RECONFIG_UNDO; + return CONF_QUEUED; + } + } + + if (config_do_commit(NULL, RECONFIG_UNDO)) + { + config_done(NULL); + return CONF_DONE; } return CONF_PROGRESS; } +extern void cmd_reconfig_undo_notify(void); + +static void +config_timeout(struct timer *t) +{ + log(L_INFO "Config timeout expired, starting undo"); + cmd_reconfig_undo_notify(); + + int r = config_undo(); + if (r < 0) + log(L_ERR "Undo request failed"); +} + +void +config_init(void) +{ + config_event = ev_new(&root_pool); + config_event->hook = config_done; + + config_timer = tm_new(&root_pool); + config_timer->hook = config_timeout; +} + /** * order_shutdown - order BIRD shutdown * @@ -328,15 +458,16 @@ order_shutdown(void) if (shutting_down) return; + log(L_INFO "Shutting down"); c = lp_alloc(config->mem, sizeof(struct config)); memcpy(c, config, sizeof(struct config)); init_list(&c->protos); init_list(&c->tables); c->shutdown = 1; + + config_commit(c, RECONFIG_HARD, 0); shutting_down = 1; - config_commit(c, RECONFIG_HARD); - shutting_down = 2; } /** -- cgit v1.2.3 From 79b4e12e6032faf6bb1f3feac385bd36ee53019e Mon Sep 17 00:00:00 2001 From: Ondrej Zajicek Date: Thu, 27 Dec 2012 12:56:23 +0100 Subject: Implements interface masks for choosing router id. Router ID could be automatically determined based of subset of ifaces/addresses specified by 'router id from' option. The patch also does some minor changes related to router ID reconfiguration. Thanks to Alexander V. Chernikov for most of the work. --- conf/conf.c | 16 +++++++++++--- conf/conf.h | 1 + doc/bird.sgml | 13 ++++++++++- nest/config.Y | 17 +++++++++++--- nest/iface.c | 66 +++++++++++++++++++++++++++++++++++++++---------------- nest/iface.h | 4 ++++ nest/proto.c | 14 +++++++++--- proto/bgp/bgp.c | 3 +++ proto/ospf/ospf.c | 3 +++ 9 files changed, 108 insertions(+), 29 deletions(-) (limited to 'conf/conf.c') diff --git a/conf/conf.c b/conf/conf.c index 6dfa3691..14225d3b 100644 --- a/conf/conf.c +++ b/conf/conf.c @@ -200,9 +200,19 @@ global_commit(struct config *new, struct config *old) log(L_WARN "Reconfiguration of BGP listening socket not implemented, please restart BIRD."); if (!new->router_id) - new->router_id = old->router_id; - if (new->router_id != old->router_id) - return 1; + { + new->router_id = old->router_id; + + if (new->router_id_from) + { + u32 id = if_choose_router_id(new->router_id_from, old->router_id); + if (!id) + log(L_WARN "Cannot determine router ID, using old one"); + else + new->router_id = id; + } + } + return 0; } diff --git a/conf/conf.h b/conf/conf.h index 19300f54..683374e0 100644 --- a/conf/conf.h +++ b/conf/conf.h @@ -26,6 +26,7 @@ struct config { int mrtdump_file; /* Configured MRTDump file (sysdep, fd in unix) */ char *syslog_name; /* Name used for syslog (NULL -> no syslog) */ struct rtable_config *master_rtc; /* Configuration of master routing table */ + struct iface_patt *router_id_from; /* Configured list of router ID iface patterns */ u32 router_id; /* Our Router ID */ ip_addr listen_bgp_addr; /* Listening BGP socket should use this address */ diff --git a/doc/bird.sgml b/doc/bird.sgml index 615ced98..4e04a138 100644 --- a/doc/bird.sgml +++ b/doc/bird.sgml @@ -337,7 +337,18 @@ protocol rip { Besides, there are some predefined numeric constants based on /etc/iproute2/rt_* files. A list of defined constants can be seen (together with other symbols) using 'show symbols' command. - router id Set BIRD's router ID. It's a world-wide unique identification of your router, usually one of router's IPv4 addresses. Default: in IPv4 version, the lowest IP address of a non-loopback interface. In IPv6 version, this option is mandatory. + router id + Set BIRD's router ID. It's a world-wide unique identification + of your router, usually one of router's IPv4 addresses. + Default: in IPv4 version, the lowest IP address of a + non-loopback interface. In IPv6 version, this option is + mandatory. + + router id from [-] [ " + Set BIRD's router ID based on an IP address of an interface + specified by an interface pattern. The option is applicable + for IPv4 version only. See + section for detailed description of interface patterns. listen bgp [address This option allows to specify address and port where BGP diff --git a/nest/config.Y b/nest/config.Y index cb6a85c2..dbd72055 100644 --- a/nest/config.Y +++ b/nest/config.Y @@ -75,9 +75,9 @@ CF_GRAMMAR CF_ADDTO(conf, rtrid) -rtrid: ROUTER ID idval ';' { - new_config->router_id = $3; - } +rtrid: + ROUTER ID idval ';' { new_config->router_id = $3; } + | ROUTER ID FROM iface_patt ';' { new_config->router_id_from = this_ipatt; } ; idval: @@ -264,6 +264,17 @@ iface_patt_list: | iface_patt_list ',' iface_patt_node ; +iface_patt_init: { + /* Generic this_ipatt init */ + this_ipatt = cfg_allocz(sizeof(struct iface_patt)); + init_list(&this_ipatt->ipn_list); + } + ; + +iface_patt: + iface_patt_init iface_patt_list + ; + /* Direct device route protocol */ diff --git a/nest/iface.c b/nest/iface.c index eea3d3b1..da79b21f 100644 --- a/nest/iface.c +++ b/nest/iface.c @@ -35,8 +35,6 @@ static pool *if_pool; -static void auto_router_id(void); - list iface_list; /** @@ -354,9 +352,6 @@ if_end_update(void) struct iface *i; struct ifa *a, *b; - if (!config->router_id) - auto_router_id(); - WALK_LIST(i, iface_list) { if (!(i->flags & IF_UPDATED)) @@ -583,24 +578,57 @@ ifa_delete(struct ifa *a) } } -static void -auto_router_id(void) +u32 +if_choose_router_id(struct iface_patt *mask, u32 old_id) { #ifndef IPV6 - struct iface *i, *j; + struct iface *i; + struct ifa *a, *b; - j = NULL; + b = NULL; WALK_LIST(i, iface_list) - if ((i->flags & IF_ADMIN_UP) && - !(i->flags & (IF_IGNORE | IF_SHUTDOWN)) && - i->addr && - !(i->addr->flags & IA_PEER) && - (!j || ipa_to_u32(i->addr->ip) < ipa_to_u32(j->addr->ip))) - j = i; - if (!j) - die("Cannot determine router ID (no suitable network interface found), please configure it manually"); - log(L_INFO "Guessed router ID %I according to interface %s", j->addr->ip, j->name); - config->router_id = ipa_to_u32(j->addr->ip); + { + if (!(i->flags & IF_ADMIN_UP) || + (i->flags & (IF_IGNORE | IF_SHUTDOWN))) + continue; + + WALK_LIST(a, i->addrs) + { + if (a->flags & IA_SECONDARY) + continue; + + if (a->scope <= SCOPE_LINK) + continue; + + /* FIXME: This should go away */ + if (a->flags & IA_PEER) + continue; + + /* FIXME: This should go away too */ + if (!mask && (a != i->addr)) + continue; + + /* Check pattern if specified */ + if (mask && !iface_patt_match(mask, i, a)) + continue; + + /* No pattern or pattern matched */ + if (!b || ipa_to_u32(a->ip) < ipa_to_u32(b->ip)) + b = a; + } + } + + if (!b) + return 0; + + u32 id = ipa_to_u32(b->ip); + if (id != old_id) + log(L_INFO "Chosen router ID %R according to interface %s", id, b->iface->name); + + return id; + +#else + return 0; #endif } diff --git a/nest/iface.h b/nest/iface.h index 2416f82f..697ea543 100644 --- a/nest/iface.h +++ b/nest/iface.h @@ -101,6 +101,7 @@ struct iface *if_find_by_name(char *); struct iface *if_get_by_name(char *); void ifa_recalc_all_primary_addresses(void); + /* The Neighbor Cache */ typedef struct neighbor { @@ -161,4 +162,7 @@ int iface_patt_match(struct iface_patt *ifp, struct iface *i, struct ifa *a); struct iface_patt *iface_patt_find(list *l, struct iface *i, struct ifa *a); int iface_patts_equal(list *, list *, int (*)(struct iface_patt *, struct iface_patt *)); + +u32 if_choose_router_id(struct iface_patt *mask, u32 old_id); + #endif diff --git a/nest/proto.c b/nest/proto.c index 1334884e..b976a6cb 100644 --- a/nest/proto.c +++ b/nest/proto.c @@ -382,11 +382,9 @@ proto_reconfigure(struct proto *p, struct proto_config *oc, struct proto_config /* If there is a too big change in core attributes, ... */ if ((nc->protocol != oc->protocol) || (nc->disabled != p->disabled) || - (nc->table->table != oc->table->table) || - (proto_get_router_id(nc) != proto_get_router_id(oc))) + (nc->table->table != oc->table->table)) return 0; - p->debug = nc->debug; p->mrtdump = nc->mrtdump; proto_reconfig_type = type; @@ -552,6 +550,16 @@ protos_commit(struct config *new, struct config *old, int force_reconfig, int ty initial_device_proto = NULL; } + /* Determine router ID for the first time - it has to be here and not in + global_commit() because it is postponed after start of device protocol */ + if (!config->router_id) + { + config->router_id = if_choose_router_id(config->router_id_from, 0); + if (!config->router_id) + die("Cannot determine router ID, please configure it manually"); + } + + /* Start all other protocols */ WALK_LIST_DELSAFE(p, n, initial_proto_list) proto_rethink_goal(p); } diff --git a/proto/bgp/bgp.c b/proto/bgp/bgp.c index 346c641b..249d2e07 100644 --- a/proto/bgp/bgp.c +++ b/proto/bgp/bgp.c @@ -1009,6 +1009,9 @@ bgp_reconfigure(struct proto *P, struct proto_config *C) struct bgp_proto *p = (struct bgp_proto *) P; struct bgp_config *old = p->cf; + if (proto_get_router_id(C) != p->local_id) + return 0; + int same = !memcmp(((byte *) old) + sizeof(struct proto_config), ((byte *) new) + sizeof(struct proto_config), // password item is last and must be checked separately diff --git a/proto/ospf/ospf.c b/proto/ospf/ospf.c index 6654e107..a3b6b2e7 100644 --- a/proto/ospf/ospf.c +++ b/proto/ospf/ospf.c @@ -729,6 +729,9 @@ ospf_reconfigure(struct proto *p, struct proto_config *c) struct ospf_iface *ifa, *ifx; struct ospf_iface_patt *ip; + if (proto_get_router_id(c) != po->router_id) + return 0; + if (po->rfc1583 != new->rfc1583) return 0; -- cgit v1.2.3