diff options
Diffstat (limited to 'isisd/isis_mt.c')
| -rw-r--r-- | isisd/isis_mt.c | 573 |
1 files changed, 573 insertions, 0 deletions
diff --git a/isisd/isis_mt.c b/isisd/isis_mt.c new file mode 100644 index 0000000..6bbb01c --- /dev/null +++ b/isisd/isis_mt.c @@ -0,0 +1,573 @@ +/* + * IS-IS Rout(e)ing protocol - Multi Topology Support + * + * Copyright (C) 2017 Christian Franke + * + * This file is part of FRRouting (FRR) + * + * FRR 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, or (at your option) any + * later version. + * + * FRR 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; see the file COPYING; if not, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ +#include <zebra.h> +#include "isisd/isisd.h" +#include "isisd/isis_circuit.h" +#include "isisd/isis_adjacency.h" +#include "isisd/isis_misc.h" +#include "isisd/isis_lsp.h" +#include "isisd/isis_mt.h" +#include "isisd/isis_tlvs.h" + +DEFINE_MTYPE_STATIC(ISISD, MT_AREA_SETTING, "ISIS MT Area Setting"); +DEFINE_MTYPE_STATIC(ISISD, MT_CIRCUIT_SETTING, "ISIS MT Circuit Setting"); +DEFINE_MTYPE_STATIC(ISISD, MT_ADJ_INFO, "ISIS MT Adjacency Info"); + +bool isis_area_ipv6_dstsrc_enabled(struct isis_area *area) +{ + struct isis_area_mt_setting *area_mt_setting; + area_mt_setting = area_lookup_mt_setting(area, ISIS_MT_IPV6_DSTSRC); + + return (area_mt_setting && area_mt_setting->enabled); +} + +uint16_t isis_area_ipv6_topology(struct isis_area *area) +{ + struct isis_area_mt_setting *area_mt_setting; + area_mt_setting = area_lookup_mt_setting(area, ISIS_MT_IPV6_UNICAST); + + if (area_mt_setting && area_mt_setting->enabled) + return ISIS_MT_IPV6_UNICAST; + return ISIS_MT_IPV4_UNICAST; +} + +/* MT naming api */ +const char *isis_mtid2str(uint16_t mtid) +{ + static char buf[sizeof("65535")]; + + switch (mtid) { + case ISIS_MT_STANDARD: + return "standard"; + case ISIS_MT_IPV4_MGMT: + return "ipv4-mgmt"; + case ISIS_MT_IPV6_UNICAST: + return "ipv6-unicast"; + case ISIS_MT_IPV4_MULTICAST: + return "ipv4-multicast"; + case ISIS_MT_IPV6_MULTICAST: + return "ipv6-multicast"; + case ISIS_MT_IPV6_MGMT: + return "ipv6-mgmt"; + case ISIS_MT_IPV6_DSTSRC: + return "ipv6-dstsrc"; + default: + snprintf(buf, sizeof(buf), "%hu", mtid); + return buf; + } +} + +uint16_t isis_str2mtid(const char *name) +{ + if (!strcmp(name, "ipv4-unicast")) + return ISIS_MT_IPV4_UNICAST; + if (!strcmp(name, "standard")) + return ISIS_MT_STANDARD; + if (!strcmp(name, "ipv4-mgmt")) + return ISIS_MT_IPV4_MGMT; + if (!strcmp(name, "ipv6-unicast")) + return ISIS_MT_IPV6_UNICAST; + if (!strcmp(name, "ipv4-multicast")) + return ISIS_MT_IPV4_MULTICAST; + if (!strcmp(name, "ipv6-multicast")) + return ISIS_MT_IPV6_MULTICAST; + if (!strcmp(name, "ipv6-mgmt")) + return ISIS_MT_IPV6_MGMT; + if (!strcmp(name, "ipv6-dstsrc")) + return ISIS_MT_IPV6_DSTSRC; + return -1; +} + +/* General MT settings api */ + +struct mt_setting { + ISIS_MT_INFO_FIELDS; +}; + +static void *lookup_mt_setting(struct list *mt_list, uint16_t mtid) +{ + struct listnode *node; + struct mt_setting *setting; + + for (ALL_LIST_ELEMENTS_RO(mt_list, node, setting)) { + if (setting->mtid == mtid) + return setting; + } + return NULL; +} + +static void add_mt_setting(struct list **mt_list, void *setting) +{ + if (!*mt_list) + *mt_list = list_new(); + listnode_add(*mt_list, setting); +} + +/* Area specific MT settings api */ + +struct isis_area_mt_setting *area_lookup_mt_setting(struct isis_area *area, + uint16_t mtid) +{ + return lookup_mt_setting(area->mt_settings, mtid); +} + +struct isis_area_mt_setting *area_new_mt_setting(struct isis_area *area, + uint16_t mtid) +{ + struct isis_area_mt_setting *setting; + + setting = XCALLOC(MTYPE_MT_AREA_SETTING, sizeof(*setting)); + setting->mtid = mtid; + return setting; +} + +static void area_free_mt_setting(void *setting) +{ + XFREE(MTYPE_MT_AREA_SETTING, setting); +} + +void area_add_mt_setting(struct isis_area *area, + struct isis_area_mt_setting *setting) +{ + add_mt_setting(&area->mt_settings, setting); +} + +void area_mt_init(struct isis_area *area) +{ + struct isis_area_mt_setting *v4_unicast_setting; + + /* MTID 0 is always enabled */ + v4_unicast_setting = area_new_mt_setting(area, ISIS_MT_IPV4_UNICAST); + v4_unicast_setting->enabled = true; + add_mt_setting(&area->mt_settings, v4_unicast_setting); + area->mt_settings->del = area_free_mt_setting; +} + +void area_mt_finish(struct isis_area *area) +{ + list_delete(&area->mt_settings); +} + +struct isis_area_mt_setting *area_get_mt_setting(struct isis_area *area, + uint16_t mtid) +{ + struct isis_area_mt_setting *setting; + + setting = area_lookup_mt_setting(area, mtid); + if (!setting) { + setting = area_new_mt_setting(area, mtid); + area_add_mt_setting(area, setting); + } + return setting; +} + +int area_write_mt_settings(struct isis_area *area, struct vty *vty) +{ + int written = 0; + struct listnode *node; + struct isis_area_mt_setting *setting; + + for (ALL_LIST_ELEMENTS_RO(area->mt_settings, node, setting)) { + const char *name = isis_mtid2str(setting->mtid); + if (name && setting->enabled) { + if (setting->mtid == ISIS_MT_IPV4_UNICAST) + continue; /* always enabled, no need to write + out config */ + vty_out(vty, " topology %s%s\n", name, + setting->overload ? " overload" : ""); + written++; + } + } + return written; +} + +bool area_is_mt(struct isis_area *area) +{ + struct listnode *node, *node2; + struct isis_area_mt_setting *setting; + struct isis_circuit *circuit; + struct isis_circuit_mt_setting *csetting; + + for (ALL_LIST_ELEMENTS_RO(area->mt_settings, node, setting)) { + if (setting->enabled && setting->mtid != ISIS_MT_IPV4_UNICAST) + return true; + } + for (ALL_LIST_ELEMENTS_RO(area->circuit_list, node, circuit)) { + for (ALL_LIST_ELEMENTS_RO(circuit->mt_settings, node2, + csetting)) { + if (!csetting->enabled + && csetting->mtid == ISIS_MT_IPV4_UNICAST) + return true; + } + } + + return false; +} + +struct isis_area_mt_setting **area_mt_settings(struct isis_area *area, + unsigned int *mt_count) +{ + static unsigned int size = 0; + static struct isis_area_mt_setting **rv = NULL; + + unsigned int count = 0; + struct listnode *node; + struct isis_area_mt_setting *setting; + + for (ALL_LIST_ELEMENTS_RO(area->mt_settings, node, setting)) { + if (!setting->enabled) + continue; + + count++; + if (count > size) { + rv = XREALLOC(MTYPE_TMP, rv, count * sizeof(*rv)); + size = count; + } + rv[count - 1] = setting; + } + + *mt_count = count; + return rv; +} + +/* Circuit specific MT settings api */ + +struct isis_circuit_mt_setting * +circuit_lookup_mt_setting(struct isis_circuit *circuit, uint16_t mtid) +{ + return lookup_mt_setting(circuit->mt_settings, mtid); +} + +struct isis_circuit_mt_setting * +circuit_new_mt_setting(struct isis_circuit *circuit, uint16_t mtid) +{ + struct isis_circuit_mt_setting *setting; + + setting = XCALLOC(MTYPE_MT_CIRCUIT_SETTING, sizeof(*setting)); + setting->mtid = mtid; + setting->enabled = true; /* Enabled is default for circuit */ + return setting; +} + +static void circuit_free_mt_setting(void *setting) +{ + XFREE(MTYPE_MT_CIRCUIT_SETTING, setting); +} + +void circuit_add_mt_setting(struct isis_circuit *circuit, + struct isis_circuit_mt_setting *setting) +{ + add_mt_setting(&circuit->mt_settings, setting); +} + +void circuit_mt_init(struct isis_circuit *circuit) +{ + circuit->mt_settings = list_new(); + circuit->mt_settings->del = circuit_free_mt_setting; +} + +void circuit_mt_finish(struct isis_circuit *circuit) +{ + list_delete(&circuit->mt_settings); +} + +struct isis_circuit_mt_setting * +circuit_get_mt_setting(struct isis_circuit *circuit, uint16_t mtid) +{ + struct isis_circuit_mt_setting *setting; + + setting = circuit_lookup_mt_setting(circuit, mtid); + if (!setting) { + setting = circuit_new_mt_setting(circuit, mtid); + circuit_add_mt_setting(circuit, setting); + } + return setting; +} + +#ifdef FABRICD +static int circuit_write_mt_settings(struct isis_circuit *circuit, + struct vty *vty) +{ + int written = 0; + struct listnode *node; + struct isis_circuit_mt_setting *setting; + + for (ALL_LIST_ELEMENTS_RO(circuit->mt_settings, node, setting)) { + const char *name = isis_mtid2str(setting->mtid); + if (name && !setting->enabled) { + vty_out(vty, " no " PROTO_NAME " topology %s\n", name); + written++; + } + } + return written; +} +#endif + +struct isis_circuit_mt_setting ** +circuit_mt_settings(struct isis_circuit *circuit, unsigned int *mt_count) +{ + static unsigned int size = 0; + static struct isis_circuit_mt_setting **rv = NULL; + + struct isis_area_mt_setting **area_settings; + unsigned int area_count; + + unsigned int count = 0; + + struct listnode *node; + struct isis_circuit_mt_setting *setting; + + area_settings = area_mt_settings(circuit->area, &area_count); + + for (unsigned int i = 0; i < area_count; i++) { + for (ALL_LIST_ELEMENTS_RO(circuit->mt_settings, node, + setting)) { + if (setting->mtid != area_settings[i]->mtid) + continue; + break; + } + if (!setting) + setting = circuit_get_mt_setting( + circuit, area_settings[i]->mtid); + + if (!setting->enabled) + continue; + + count++; + if (count > size) { + rv = XREALLOC(MTYPE_TMP, rv, count * sizeof(*rv)); + size = count; + } + rv[count - 1] = setting; + } + + *mt_count = count; + return rv; +} + +/* ADJ specific MT API */ +static void adj_mt_set(struct isis_adjacency *adj, unsigned int index, + uint16_t mtid) +{ + if (adj->mt_count < index + 1) { + adj->mt_set = XREALLOC(MTYPE_MT_ADJ_INFO, adj->mt_set, + (index + 1) * sizeof(*adj->mt_set)); + adj->mt_count = index + 1; + } + adj->mt_set[index] = mtid; +} + +bool tlvs_to_adj_mt_set(struct isis_tlvs *tlvs, bool v4_usable, bool v6_usable, + struct isis_adjacency *adj) +{ + struct isis_circuit_mt_setting **mt_settings; + unsigned int circuit_mt_count; + + unsigned int intersect_count = 0; + + uint16_t *old_mt_set = NULL; + unsigned int old_mt_count; + + old_mt_count = adj->mt_count; + if (old_mt_count) { + old_mt_set = + XCALLOC(MTYPE_TMP, old_mt_count * sizeof(*old_mt_set)); + memcpy(old_mt_set, adj->mt_set, + old_mt_count * sizeof(*old_mt_set)); + } + + mt_settings = circuit_mt_settings(adj->circuit, &circuit_mt_count); + for (unsigned int i = 0; i < circuit_mt_count; i++) { + if (!tlvs->mt_router_info.count + && !tlvs->mt_router_info_empty) { + /* Other end does not have MT enabled */ + if (mt_settings[i]->mtid == ISIS_MT_IPV4_UNICAST + && (v4_usable || v6_usable)) + adj_mt_set(adj, intersect_count++, + ISIS_MT_IPV4_UNICAST); + } else { + struct isis_mt_router_info *info_head; + + info_head = (struct isis_mt_router_info *) + tlvs->mt_router_info.head; + for (struct isis_mt_router_info *info = info_head; info; + info = info->next) { + if (mt_settings[i]->mtid == info->mtid) { + bool usable; + switch (info->mtid) { + case ISIS_MT_IPV4_UNICAST: + case ISIS_MT_IPV4_MGMT: + case ISIS_MT_IPV4_MULTICAST: + usable = v4_usable; + break; + case ISIS_MT_IPV6_UNICAST: + case ISIS_MT_IPV6_MGMT: + case ISIS_MT_IPV6_MULTICAST: + usable = v6_usable; + break; + default: + usable = true; + break; + } + if (usable) + adj_mt_set(adj, + intersect_count++, + info->mtid); + } + } + } + } + adj->mt_count = intersect_count; + + bool changed = false; + + if (adj->mt_count != old_mt_count) + changed = true; + + if (!changed && old_mt_count + && memcmp(adj->mt_set, old_mt_set, + old_mt_count * sizeof(*old_mt_set))) + changed = true; + + if (old_mt_count) + XFREE(MTYPE_TMP, old_mt_set); + + return changed; +} + +bool adj_has_mt(struct isis_adjacency *adj, uint16_t mtid) +{ + for (unsigned int i = 0; i < adj->mt_count; i++) + if (adj->mt_set[i] == mtid) + return true; + return false; +} + +void adj_mt_finish(struct isis_adjacency *adj) +{ + XFREE(MTYPE_MT_ADJ_INFO, adj->mt_set); + adj->mt_count = 0; +} + +static void mt_set_add(uint16_t **mt_set, unsigned int *size, + unsigned int *index, uint16_t mtid) +{ + for (unsigned int i = 0; i < *index; i++) { + if ((*mt_set)[i] == mtid) + return; + } + + if (*index >= *size) { + *mt_set = XREALLOC(MTYPE_TMP, *mt_set, + sizeof(**mt_set) * ((*index) + 1)); + *size = (*index) + 1; + } + + (*mt_set)[*index] = mtid; + *index = (*index) + 1; +} + +static uint16_t *circuit_bcast_mt_set(struct isis_circuit *circuit, int level, + unsigned int *mt_count) +{ + static uint16_t *rv; + static unsigned int size; + struct listnode *node; + struct isis_adjacency *adj; + + unsigned int count = 0; + + if (circuit->circ_type != CIRCUIT_T_BROADCAST) { + *mt_count = 0; + return NULL; + } + + for (ALL_LIST_ELEMENTS_RO(circuit->u.bc.adjdb[level - 1], node, adj)) { + if (adj->adj_state != ISIS_ADJ_UP) + continue; + for (unsigned int i = 0; i < adj->mt_count; i++) + mt_set_add(&rv, &size, &count, adj->mt_set[i]); + } + + *mt_count = count; + return rv; +} + +static void tlvs_add_mt_set(struct isis_area *area, struct isis_tlvs *tlvs, + unsigned int mt_count, uint16_t *mt_set, + uint8_t *id, uint32_t metric, + struct isis_ext_subtlvs *ext) +{ + /* Check if MT is enable for this area */ + if (!area_is_mt(area)) { + lsp_debug( + "ISIS (%s): Adding %s.%02x as te-style neighbor (MT disable)", + area->area_tag, sysid_print(id), LSP_PSEUDO_ID(id)); + isis_tlvs_add_extended_reach(tlvs, ISIS_MT_DISABLE, id, metric, + ext); + return; + } + + /* Process Multi-Topology */ + for (unsigned int i = 0; i < mt_count; i++) { + uint16_t mtid = mt_set[i]; + if (mt_set[i] == ISIS_MT_IPV4_UNICAST) { + lsp_debug( + "ISIS (%s): Adding %s.%02x as te-style neighbor", + area->area_tag, sysid_print(id), + LSP_PSEUDO_ID(id)); + } else { + lsp_debug( + "ISIS (%s): Adding %s.%02x as mt-style neighbor for %s", + area->area_tag, sysid_print(id), + LSP_PSEUDO_ID(id), isis_mtid2str(mtid)); + } + isis_tlvs_add_extended_reach(tlvs, mtid, id, metric, ext); + } +} + +void tlvs_add_mt_bcast(struct isis_tlvs *tlvs, struct isis_circuit *circuit, + int level, uint8_t *id, uint32_t metric) +{ + unsigned int mt_count; + uint16_t *mt_set = circuit_bcast_mt_set(circuit, level, &mt_count); + + tlvs_add_mt_set(circuit->area, tlvs, mt_count, mt_set, id, metric, + circuit->ext); +} + +void tlvs_add_mt_p2p(struct isis_tlvs *tlvs, struct isis_circuit *circuit, + uint8_t *id, uint32_t metric) +{ + struct isis_adjacency *adj = circuit->u.p2p.neighbor; + + tlvs_add_mt_set(circuit->area, tlvs, adj->mt_count, adj->mt_set, id, + metric, circuit->ext); +} + +void mt_init(void) +{ +#ifdef FABRICD + hook_register(isis_circuit_config_write, + circuit_write_mt_settings); +#endif +} |