/* RIPv2 routemap. * Copyright (C) 2005 6WIND * Copyright (C) 1999 Kunihiro Ishiguro * * This file is part of GNU Zebra. * * GNU Zebra 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. * * GNU Zebra 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 #include "memory.h" #include "prefix.h" #include "vty.h" #include "routemap.h" #include "command.h" #include "filter.h" #include "log.h" #include "sockunion.h" /* for inet_aton () */ #include "plist.h" #include "vrf.h" #include "ripd/ripd.h" struct rip_metric_modifier { enum { metric_increment, metric_decrement, metric_absolute } type; bool used; uint8_t metric; }; /* `match metric METRIC' */ /* Match function return 1 if match is success else return zero. */ static enum route_map_cmd_result_t route_match_metric(void *rule, const struct prefix *prefix, void *object) { uint32_t *metric; uint32_t check; struct rip_info *rinfo; metric = rule; rinfo = object; /* If external metric is available, the route-map should work on this one (for redistribute purpose) */ check = (rinfo->external_metric) ? rinfo->external_metric : rinfo->metric; if (check == *metric) return RMAP_MATCH; else return RMAP_NOMATCH; } /* Route map `match metric' match statement. `arg' is METRIC value */ static void *route_match_metric_compile(const char *arg) { uint32_t *metric; metric = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(uint32_t)); *metric = atoi(arg); if (*metric > 0) return metric; XFREE(MTYPE_ROUTE_MAP_COMPILED, metric); return NULL; } /* Free route map's compiled `match metric' value. */ static void route_match_metric_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } /* Route map commands for metric matching. */ static const struct route_map_rule_cmd route_match_metric_cmd = { "metric", route_match_metric, route_match_metric_compile, route_match_metric_free }; /* `match interface IFNAME' */ /* Match function return 1 if match is success else return zero. */ static enum route_map_cmd_result_t route_match_interface(void *rule, const struct prefix *prefix, void *object) { struct rip_info *rinfo; struct interface *ifp; char *ifname; ifname = rule; ifp = if_lookup_by_name(ifname, VRF_DEFAULT); if (!ifp) return RMAP_NOMATCH; rinfo = object; if (rinfo->ifindex_out == ifp->ifindex || rinfo->nh.ifindex == ifp->ifindex) return RMAP_MATCH; else return RMAP_NOMATCH; } /* Route map `match interface' match statement. `arg' is IFNAME value */ /* XXX I don`t know if I need to check does interface exist? */ static void *route_match_interface_compile(const char *arg) { return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg); } /* Free route map's compiled `match interface' value. */ static void route_match_interface_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } /* Route map commands for interface matching. */ static const struct route_map_rule_cmd route_match_interface_cmd = { "interface", route_match_interface, route_match_interface_compile, route_match_interface_free }; /* `match ip next-hop IP_ACCESS_LIST' */ /* Match function return 1 if match is success else return zero. */ static enum route_map_cmd_result_t route_match_ip_next_hop(void *rule, const struct prefix *prefix, void *object) { struct access_list *alist; struct rip_info *rinfo; struct prefix_ipv4 p; rinfo = object; p.family = AF_INET; p.prefix = (rinfo->nh.gate.ipv4.s_addr != INADDR_ANY) ? rinfo->nh.gate.ipv4 : rinfo->from; p.prefixlen = IPV4_MAX_BITLEN; alist = access_list_lookup(AFI_IP, (char *)rule); if (alist == NULL) return RMAP_NOMATCH; return (access_list_apply(alist, &p) == FILTER_DENY ? RMAP_NOMATCH : RMAP_MATCH); } /* Route map `ip next-hop' match statement. `arg' should be access-list name. */ static void *route_match_ip_next_hop_compile(const char *arg) { return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg); } /* Free route map's compiled `. */ static void route_match_ip_next_hop_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } /* Route map commands for ip next-hop matching. */ static const struct route_map_rule_cmd route_match_ip_next_hop_cmd = { "ip next-hop", route_match_ip_next_hop, route_match_ip_next_hop_compile, route_match_ip_next_hop_free }; /* `match ip next-hop prefix-list PREFIX_LIST' */ static enum route_map_cmd_result_t route_match_ip_next_hop_prefix_list(void *rule, const struct prefix *prefix, void *object) { struct prefix_list *plist; struct rip_info *rinfo; struct prefix_ipv4 p; rinfo = object; p.family = AF_INET; p.prefix = (rinfo->nh.gate.ipv4.s_addr != INADDR_ANY) ? rinfo->nh.gate.ipv4 : rinfo->from; p.prefixlen = IPV4_MAX_BITLEN; plist = prefix_list_lookup(AFI_IP, (char *)rule); if (plist == NULL) return RMAP_NOMATCH; return (prefix_list_apply(plist, &p) == PREFIX_DENY ? RMAP_NOMATCH : RMAP_MATCH); } static void *route_match_ip_next_hop_prefix_list_compile(const char *arg) { return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg); } static void route_match_ip_next_hop_prefix_list_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } static const struct route_map_rule_cmd route_match_ip_next_hop_prefix_list_cmd = { "ip next-hop prefix-list", route_match_ip_next_hop_prefix_list, route_match_ip_next_hop_prefix_list_compile, route_match_ip_next_hop_prefix_list_free }; /* `match ip next-hop type ' */ static enum route_map_cmd_result_t route_match_ip_next_hop_type(void *rule, const struct prefix *prefix, void *object) { struct rip_info *rinfo; if (prefix->family == AF_INET) { rinfo = (struct rip_info *)object; if (!rinfo) return RMAP_NOMATCH; if (rinfo->nh.type == NEXTHOP_TYPE_BLACKHOLE) return RMAP_MATCH; } return RMAP_NOMATCH; } static void *route_match_ip_next_hop_type_compile(const char *arg) { return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg); } static void route_match_ip_next_hop_type_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } static const struct route_map_rule_cmd route_match_ip_next_hop_type_cmd = { "ip next-hop type", route_match_ip_next_hop_type, route_match_ip_next_hop_type_compile, route_match_ip_next_hop_type_free }; /* `match ip address IP_ACCESS_LIST' */ /* Match function should return 1 if match is success else return zero. */ static enum route_map_cmd_result_t route_match_ip_address(void *rule, const struct prefix *prefix, void *object) { struct access_list *alist; alist = access_list_lookup(AFI_IP, (char *)rule); if (alist == NULL) return RMAP_NOMATCH; return (access_list_apply(alist, prefix) == FILTER_DENY ? RMAP_NOMATCH : RMAP_MATCH); } /* Route map `ip address' match statement. `arg' should be access-list name. */ static void *route_match_ip_address_compile(const char *arg) { return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg); } /* Free route map's compiled `ip address' value. */ static void route_match_ip_address_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } /* Route map commands for ip address matching. */ static const struct route_map_rule_cmd route_match_ip_address_cmd = { "ip address", route_match_ip_address, route_match_ip_address_compile, route_match_ip_address_free }; /* `match ip address prefix-list PREFIX_LIST' */ static enum route_map_cmd_result_t route_match_ip_address_prefix_list(void *rule, const struct prefix *prefix, void *object) { struct prefix_list *plist; plist = prefix_list_lookup(AFI_IP, (char *)rule); if (plist == NULL) return RMAP_NOMATCH; return (prefix_list_apply(plist, prefix) == PREFIX_DENY ? RMAP_NOMATCH : RMAP_MATCH); } static void *route_match_ip_address_prefix_list_compile(const char *arg) { return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg); } static void route_match_ip_address_prefix_list_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } static const struct route_map_rule_cmd route_match_ip_address_prefix_list_cmd = { "ip address prefix-list", route_match_ip_address_prefix_list, route_match_ip_address_prefix_list_compile, route_match_ip_address_prefix_list_free }; /* `match tag TAG' */ /* Match function return 1 if match is success else return zero. */ static enum route_map_cmd_result_t route_match_tag(void *rule, const struct prefix *p, void *object) { route_tag_t *tag; struct rip_info *rinfo; route_tag_t rinfo_tag; tag = rule; rinfo = object; /* The information stored by rinfo is host ordered. */ rinfo_tag = rinfo->tag; if (rinfo_tag == *tag) return RMAP_MATCH; else return RMAP_NOMATCH; } /* Route map commands for tag matching. */ static const struct route_map_rule_cmd route_match_tag_cmd = { "tag", route_match_tag, route_map_rule_tag_compile, route_map_rule_tag_free, }; /* `set metric METRIC' */ /* Set metric to attribute. */ static enum route_map_cmd_result_t route_set_metric(void *rule, const struct prefix *prefix, void *object) { struct rip_metric_modifier *mod; struct rip_info *rinfo; mod = rule; rinfo = object; if (!mod->used) return RMAP_OKAY; if (mod->type == metric_increment) rinfo->metric_out += mod->metric; else if (mod->type == metric_decrement) rinfo->metric_out -= mod->metric; else if (mod->type == metric_absolute) rinfo->metric_out = mod->metric; if ((signed int)rinfo->metric_out < 1) rinfo->metric_out = 1; if (rinfo->metric_out > RIP_METRIC_INFINITY) rinfo->metric_out = RIP_METRIC_INFINITY; rinfo->metric_set = 1; return RMAP_OKAY; } /* set metric compilation. */ static void *route_set_metric_compile(const char *arg) { int len; const char *pnt; long metric; char *endptr = NULL; struct rip_metric_modifier *mod; mod = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(struct rip_metric_modifier)); mod->used = false; len = strlen(arg); pnt = arg; if (len == 0) return mod; /* Examine first character. */ if (arg[0] == '+') { mod->type = metric_increment; pnt++; } else if (arg[0] == '-') { mod->type = metric_decrement; pnt++; } else mod->type = metric_absolute; /* Check beginning with digit string. */ if (*pnt < '0' || *pnt > '9') return mod; /* Convert string to integer. */ metric = strtol(pnt, &endptr, 10); if (*endptr != '\0' || metric < 0) { return mod; } if (metric > RIP_METRIC_INFINITY) { zlog_info( "%s: Metric specified: %ld is greater than RIP_METRIC_INFINITY, using INFINITY instead", __func__, metric); mod->metric = RIP_METRIC_INFINITY; } else mod->metric = metric; mod->used = true; return mod; } /* Free route map's compiled `set metric' value. */ static void route_set_metric_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } /* Set metric rule structure. */ static const struct route_map_rule_cmd route_set_metric_cmd = { "metric", route_set_metric, route_set_metric_compile, route_set_metric_free, }; /* `set ip next-hop IP_ADDRESS' */ /* Set nexthop to object. object must be pointer to struct attr. */ static enum route_map_cmd_result_t route_set_ip_nexthop(void *rule, const struct prefix *prefix, void *object) { struct in_addr *address; struct rip_info *rinfo; /* Fetch routemap's rule information. */ address = rule; rinfo = object; /* Set next hop value. */ rinfo->nexthop_out = *address; return RMAP_OKAY; } /* Route map `ip nexthop' compile function. Given string is converted to struct in_addr structure. */ static void *route_set_ip_nexthop_compile(const char *arg) { int ret; struct in_addr *address; address = XMALLOC(MTYPE_ROUTE_MAP_COMPILED, sizeof(struct in_addr)); ret = inet_aton(arg, address); if (ret == 0) { XFREE(MTYPE_ROUTE_MAP_COMPILED, address); return NULL; } return address; } /* Free route map's compiled `ip nexthop' value. */ static void route_set_ip_nexthop_free(void *rule) { XFREE(MTYPE_ROUTE_MAP_COMPILED, rule); } /* Route map commands for ip nexthop set. */ static const struct route_map_rule_cmd route_set_ip_nexthop_cmd = { "ip next-hop", route_set_ip_nexthop, route_set_ip_nexthop_compile, route_set_ip_nexthop_free }; /* `set tag TAG' */ /* Set tag to object. object must be pointer to struct attr. */ static enum route_map_cmd_result_t route_set_tag(void *rule, const struct prefix *prefix, void *object) { route_tag_t *tag; struct rip_info *rinfo; /* Fetch routemap's rule information. */ tag = rule; rinfo = object; /* Set next hop value. */ rinfo->tag_out = *tag; return RMAP_OKAY; } /* Route map commands for tag set. */ static const struct route_map_rule_cmd route_set_tag_cmd = { "tag", route_set_tag, route_map_rule_tag_compile, route_map_rule_tag_free }; #define MATCH_STR "Match values from routing table\n" #define SET_STR "Set values in destination routing protocol\n" /* Route-map init */ void rip_route_map_init(void) { route_map_init(); route_map_match_interface_hook(generic_match_add); route_map_no_match_interface_hook(generic_match_delete); route_map_match_ip_address_hook(generic_match_add); route_map_no_match_ip_address_hook(generic_match_delete); route_map_match_ip_address_prefix_list_hook(generic_match_add); route_map_no_match_ip_address_prefix_list_hook(generic_match_delete); route_map_match_ip_next_hop_hook(generic_match_add); route_map_no_match_ip_next_hop_hook(generic_match_delete); route_map_match_ip_next_hop_prefix_list_hook(generic_match_add); route_map_no_match_ip_next_hop_prefix_list_hook(generic_match_delete); route_map_match_ip_next_hop_type_hook(generic_match_add); route_map_no_match_ip_next_hop_type_hook(generic_match_delete); route_map_match_metric_hook(generic_match_add); route_map_no_match_metric_hook(generic_match_delete); route_map_match_tag_hook(generic_match_add); route_map_no_match_tag_hook(generic_match_delete); route_map_set_ip_nexthop_hook(generic_set_add); route_map_no_set_ip_nexthop_hook(generic_set_delete); route_map_set_metric_hook(generic_set_add); route_map_no_set_metric_hook(generic_set_delete); route_map_set_tag_hook(generic_set_add); route_map_no_set_tag_hook(generic_set_delete); route_map_install_match(&route_match_metric_cmd); route_map_install_match(&route_match_interface_cmd); route_map_install_match(&route_match_ip_next_hop_cmd); route_map_install_match(&route_match_ip_next_hop_prefix_list_cmd); route_map_install_match(&route_match_ip_next_hop_type_cmd); route_map_install_match(&route_match_ip_address_cmd); route_map_install_match(&route_match_ip_address_prefix_list_cmd); route_map_install_match(&route_match_tag_cmd); route_map_install_set(&route_set_metric_cmd); route_map_install_set(&route_set_ip_nexthop_cmd); route_map_install_set(&route_set_tag_cmd); }