diff options
Diffstat (limited to 'bfdd/bfdd_nb_config.c')
| -rw-r--r-- | bfdd/bfdd_nb_config.c | 520 |
1 files changed, 520 insertions, 0 deletions
diff --git a/bfdd/bfdd_nb_config.c b/bfdd/bfdd_nb_config.c new file mode 100644 index 000000000..50f953115 --- /dev/null +++ b/bfdd/bfdd_nb_config.c @@ -0,0 +1,520 @@ +/* + * BFD daemon northbound implementation. + * + * Copyright (C) 2019 Network Device Education Foundation, Inc. ("NetDEF") + * Rafael Zalamena + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301 USA. + */ + +#include <zebra.h> + +#include "lib/log.h" +#include "lib/northbound.h" + +#include "bfd.h" +#include "bfdd_nb.h" + +/* + * Helpers. + */ +static void bfd_session_get_key(bool mhop, const struct lyd_node *dnode, + struct bfd_key *bk) +{ + const char *ifname = NULL, *vrfname = NULL; + struct sockaddr_any psa, lsa; + + /* Required destination parameter. */ + strtosa(yang_dnode_get_string(dnode, "./dest-addr"), &psa); + + /* Get optional source address. */ + memset(&lsa, 0, sizeof(lsa)); + if (yang_dnode_exists(dnode, "./source-addr")) + strtosa(yang_dnode_get_string(dnode, "./source-addr"), &lsa); + + /* Get optional interface and vrf names. */ + if (yang_dnode_exists(dnode, "./interface")) + ifname = yang_dnode_get_string(dnode, "./interface"); + if (yang_dnode_exists(dnode, "./vrf")) + vrfname = yang_dnode_get_string(dnode, "./vrf"); + + /* Generate the corresponding key. */ + gen_bfd_key(bk, &psa, &lsa, mhop, ifname, vrfname); +} + +static int bfd_session_create(enum nb_event event, const struct lyd_node *dnode, + union nb_resource *resource, bool mhop) +{ + struct bfd_session *bs; + const char *ifname; + struct bfd_key bk; + struct prefix p; + + switch (event) { + case NB_EV_VALIDATE: + /* + * When `dest-addr` is IPv6 and link-local we must + * require interface name, otherwise we can't figure + * which interface to use to send the packets. + */ + yang_dnode_get_prefix(&p, dnode, "./dest-addr"); + + /* + * To support old FRR versions we must allow empty + * interface to be specified, however that should + * change in the future. + */ + if (yang_dnode_exists(dnode, "./interface")) + ifname = yang_dnode_get_string(dnode, "./interface"); + else + ifname = ""; + + if (p.family == AF_INET6 && IN6_IS_ADDR_LINKLOCAL(&p.u.prefix6) + && strlen(ifname) == 0) { + zlog_warn( + "%s: when using link-local you must specify " + "an interface.", + __func__); + return NB_ERR_VALIDATION; + } + break; + + case NB_EV_PREPARE: + bfd_session_get_key(mhop, dnode, &bk); + bs = bfd_key_lookup(bk); + + /* This session was already configured by another daemon. */ + if (bs != NULL) { + /* Now it is configured also by CLI. */ + BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_CONFIG); + bs->refcount++; + + resource->ptr = bs; + break; + } + + bs = bfd_session_new(); + if (bs == NULL) + return NB_ERR_RESOURCE; + + /* Fill the session key. */ + bfd_session_get_key(mhop, dnode, &bs->key); + + /* Set configuration flags. */ + bs->refcount = 1; + BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_CONFIG); + if (mhop) + BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_MH); + if (bs->key.family == AF_INET6) + BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_IPV6); + + resource->ptr = bs; + break; + + case NB_EV_APPLY: + bs = resource->ptr; + + /* Only attempt to registrate if freshly allocated. */ + if (bs->discrs.my_discr == 0 && bs_registrate(bs) == NULL) + return NB_ERR_RESOURCE; + + nb_running_set_entry(dnode, bs); + break; + + case NB_EV_ABORT: + bs = resource->ptr; + if (bs->refcount <= 1) + bfd_session_free(resource->ptr); + break; + } + + return NB_OK; +} + +static int bfd_session_destroy(enum nb_event event, + const struct lyd_node *dnode, bool mhop) +{ + struct bfd_session *bs; + struct bfd_key bk; + + switch (event) { + case NB_EV_VALIDATE: + bfd_session_get_key(mhop, dnode, &bk); + if (bfd_key_lookup(bk) == NULL) + return NB_ERR_INCONSISTENCY; + break; + + case NB_EV_PREPARE: + /* NOTHING */ + break; + + case NB_EV_APPLY: + bs = nb_running_unset_entry(dnode); + /* CLI is not using this session anymore. */ + if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_CONFIG) == 0) + break; + + BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_CONFIG); + bs->refcount--; + /* There are still daemons using it. */ + if (bs->refcount > 0) + break; + + bfd_session_free(bs); + break; + + case NB_EV_ABORT: + /* NOTHING */ + break; + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd + */ +int bfdd_bfd_create(enum nb_event event, + const struct lyd_node *dnode __attribute__((__unused__)), + union nb_resource *resource __attribute__((__unused__))) +{ + /* NOTHING */ + return NB_OK; +} + +int bfdd_bfd_destroy(enum nb_event event, const struct lyd_node *dnode) +{ + switch (event) { + case NB_EV_VALIDATE: + /* NOTHING */ + return NB_OK; + + case NB_EV_PREPARE: + /* NOTHING */ + return NB_OK; + + case NB_EV_APPLY: + bfd_sessions_remove_manual(); + break; + + case NB_EV_ABORT: + /* NOTHING */ + return NB_OK; + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop + */ +int bfdd_bfd_sessions_single_hop_create(enum nb_event event, + const struct lyd_node *dnode, + union nb_resource *resource) +{ + return bfd_session_create(event, dnode, resource, false); +} + +int bfdd_bfd_sessions_single_hop_destroy(enum nb_event event, + const struct lyd_node *dnode) +{ + return bfd_session_destroy(event, dnode, false); +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop/source-addr + */ +int bfdd_bfd_sessions_single_hop_source_addr_modify(enum nb_event event + __attribute__((__unused__)), + const struct lyd_node *dnode + __attribute__((__unused__)), + union nb_resource *resource + __attribute__((__unused__))) +{ + return NB_OK; +} + +int bfdd_bfd_sessions_single_hop_source_addr_destroy( + enum nb_event event __attribute__((__unused__)), + const struct lyd_node *dnode __attribute__((__unused__))) +{ + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop/detection-multiplier + */ +int bfdd_bfd_sessions_single_hop_detection_multiplier_modify( + enum nb_event event, const struct lyd_node *dnode, + union nb_resource *resource __attribute__((__unused__))) +{ + uint8_t detection_multiplier = yang_dnode_get_uint8(dnode, NULL); + struct bfd_session *bs; + + switch (event) { + case NB_EV_VALIDATE: + break; + + case NB_EV_PREPARE: + /* NOTHING */ + break; + + case NB_EV_APPLY: + bs = nb_running_get_entry(dnode, NULL, true); + bs->detect_mult = detection_multiplier; + break; + + case NB_EV_ABORT: + /* NOTHING */ + break; + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop/desired-transmission-interval + */ +int bfdd_bfd_sessions_single_hop_desired_transmission_interval_modify( + enum nb_event event, const struct lyd_node *dnode, + union nb_resource *resource __attribute__((__unused__))) +{ + uint32_t tx_interval = yang_dnode_get_uint32(dnode, NULL); + struct bfd_session *bs; + + switch (event) { + case NB_EV_VALIDATE: + if (tx_interval < 10000 || tx_interval > 60000000) + return NB_ERR_VALIDATION; + break; + + case NB_EV_PREPARE: + /* NOTHING */ + break; + + case NB_EV_APPLY: + bs = nb_running_get_entry(dnode, NULL, true); + if (tx_interval == bs->timers.desired_min_tx) + return NB_OK; + + bs->timers.desired_min_tx = tx_interval; + bfd_set_polling(bs); + break; + + case NB_EV_ABORT: + /* NOTHING */ + break; + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop/required-receive-interval + */ +int bfdd_bfd_sessions_single_hop_required_receive_interval_modify( + enum nb_event event, const struct lyd_node *dnode, + union nb_resource *resource __attribute__((__unused__))) +{ + uint32_t rx_interval = yang_dnode_get_uint32(dnode, NULL); + struct bfd_session *bs; + + switch (event) { + case NB_EV_VALIDATE: + if (rx_interval < 10000 || rx_interval > 60000000) + return NB_ERR_VALIDATION; + break; + + case NB_EV_PREPARE: + /* NOTHING */ + break; + + case NB_EV_APPLY: + bs = nb_running_get_entry(dnode, NULL, true); + if (rx_interval == bs->timers.required_min_rx) + return NB_OK; + + bs->timers.required_min_rx = rx_interval; + bfd_set_polling(bs); + break; + + case NB_EV_ABORT: + /* NOTHING */ + break; + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop/administrative-down + */ +int bfdd_bfd_sessions_single_hop_administrative_down_modify( + enum nb_event event, const struct lyd_node *dnode, + union nb_resource *resource __attribute__((__unused__))) +{ + bool shutdown = yang_dnode_get_bool(dnode, NULL); + struct bfd_session *bs; + + switch (event) { + case NB_EV_VALIDATE: + case NB_EV_PREPARE: + return NB_OK; + + case NB_EV_APPLY: + break; + + case NB_EV_ABORT: + return NB_OK; + } + + bs = nb_running_get_entry(dnode, NULL, true); + + if (shutdown == false) { + if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN)) + return NB_OK; + + BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN); + + /* Change and notify state change. */ + bs->ses_state = PTM_BFD_DOWN; + control_notify(bs, bs->ses_state); + + /* Enable all timers. */ + bfd_recvtimer_update(bs); + bfd_xmttimer_update(bs, bs->xmt_TO); + if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO)) { + bfd_echo_recvtimer_update(bs); + bfd_echo_xmttimer_update(bs, bs->echo_xmt_TO); + } + } else { + if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN)) + return NB_OK; + + BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN); + + /* Disable all events. */ + bfd_recvtimer_delete(bs); + bfd_echo_recvtimer_delete(bs); + bfd_xmttimer_delete(bs); + bfd_echo_xmttimer_delete(bs); + + /* Change and notify state change. */ + bs->ses_state = PTM_BFD_ADM_DOWN; + control_notify(bs, bs->ses_state); + + ptm_bfd_snd(bs, 0); + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/single-hop/echo-mode + */ +int bfdd_bfd_sessions_single_hop_echo_mode_modify(enum nb_event event, + const struct lyd_node *dnode, + union nb_resource *resource + __attribute__((__unused__))) +{ + bool echo = yang_dnode_get_bool(dnode, NULL); + struct bfd_session *bs; + + switch (event) { + case NB_EV_VALIDATE: + case NB_EV_PREPARE: + return NB_OK; + + case NB_EV_APPLY: + break; + + case NB_EV_ABORT: + return NB_OK; + } + + bs = nb_running_get_entry(dnode, NULL, true); + + if (echo == false) { + if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO)) + return NB_OK; + + BFD_UNSET_FLAG(bs->flags, BFD_SESS_FLAG_ECHO); + ptm_bfd_echo_stop(bs); + } else { + if (BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_ECHO)) + return NB_OK; + + BFD_SET_FLAG(bs->flags, BFD_SESS_FLAG_ECHO); + /* Apply setting immediately. */ + if (!BFD_CHECK_FLAG(bs->flags, BFD_SESS_FLAG_SHUTDOWN)) + bs_echo_timer_handler(bs); + } + + return NB_OK; +} + +/* + * XPath: + * /frr-bfdd:bfdd/bfd/sessions/single-hop/desired-echo-transmission-interval + */ +int bfdd_bfd_sessions_single_hop_desired_echo_transmission_interval_modify( + enum nb_event event, const struct lyd_node *dnode, + union nb_resource *resource __attribute__((__unused__))) +{ + uint32_t echo_interval = yang_dnode_get_uint32(dnode, NULL); + struct bfd_session *bs; + + switch (event) { + case NB_EV_VALIDATE: + if (echo_interval < 10000 || echo_interval > 60000000) + return NB_ERR_VALIDATION; + break; + + case NB_EV_PREPARE: + /* NOTHING */ + break; + + case NB_EV_APPLY: + bs = nb_running_get_entry(dnode, NULL, true); + if (echo_interval == bs->timers.required_min_echo) + return NB_OK; + + bs->timers.required_min_echo = echo_interval; + break; + + case NB_EV_ABORT: + /* NOTHING */ + break; + } + + return NB_OK; +} + +/* + * XPath: /frr-bfdd:bfdd/bfd/sessions/multi-hop + */ +int bfdd_bfd_sessions_multi_hop_create(enum nb_event event, + const struct lyd_node *dnode, + union nb_resource *resource) +{ + return bfd_session_create(event, dnode, resource, true); +} + +int bfdd_bfd_sessions_multi_hop_destroy(enum nb_event event, + const struct lyd_node *dnode) +{ + return bfd_session_destroy(event, dnode, true); +} |