return new;
}
+/* Replace all ASNs with our own ASN */
+struct aspath *aspath_replace_all_asn(struct aspath *aspath, as_t our_asn)
+{
+ struct aspath *new;
+ struct assegment *seg;
+
+ new = aspath_dup(aspath);
+ seg = new->segments;
+
+ while (seg) {
+ int i;
+
+ for (i = 0; i < seg->length; i++)
+ seg->as[i] = our_asn;
+
+ seg = seg->next;
+ }
+
+ aspath_str_update(new, false);
+ return new;
+}
+
/* Replace all private ASNs with our own ASN */
struct aspath *aspath_replace_private_asns(struct aspath *aspath, as_t asn,
as_t peer_asn)
extern struct aspath *aspath_replace_specific_asn(struct aspath *aspath,
as_t target_asn,
as_t our_asn);
+extern struct aspath *aspath_replace_all_asn(struct aspath *aspath,
+ as_t our_asn);
extern struct aspath *aspath_replace_private_asns(struct aspath *aspath,
as_t asn, as_t peer_asn);
extern struct aspath *aspath_remove_private_asns(struct aspath *aspath,
route_aspath_free,
};
+/* `set as-path replace AS-PATH` */
+static void *route_aspath_replace_compile(const char *arg)
+{
+ return XSTRDUP(MTYPE_ROUTE_MAP_COMPILED, arg);
+}
+
+static void route_aspath_replace_free(void *rule)
+{
+ XFREE(MTYPE_ROUTE_MAP_COMPILED, rule);
+}
+
+static enum route_map_cmd_result_t
+route_set_aspath_replace(void *rule, const struct prefix *dummy, void *object)
+{
+ struct aspath *aspath_new;
+ const char *replace = rule;
+ struct bgp_path_info *path = object;
+ as_t own_asn = path->peer->change_local_as ? path->peer->change_local_as
+ : path->peer->local_as;
+
+ if (path->peer->sort != BGP_PEER_EBGP) {
+ zlog_warn(
+ "`set as-path replace` is supported only for EBGP peers");
+ return RMAP_NOOP;
+ }
+
+ if (path->attr->aspath->refcnt)
+ aspath_new = aspath_dup(path->attr->aspath);
+ else
+ aspath_new = path->attr->aspath;
+
+ if (strmatch(replace, "any")) {
+ path->attr->aspath =
+ aspath_replace_all_asn(aspath_new, own_asn);
+ } else {
+ as_t replace_asn = strtoul(replace, NULL, 10);
+
+ path->attr->aspath = aspath_replace_specific_asn(
+ aspath_new, replace_asn, own_asn);
+ }
+
+ return RMAP_OKAY;
+}
+
+static const struct route_map_rule_cmd route_set_aspath_replace_cmd = {
+ "as-path replace",
+ route_set_aspath_replace,
+ route_aspath_replace_compile,
+ route_aspath_replace_free,
+};
+
/* `set community COMMUNITY' */
struct rmap_com_set {
struct community *com;
return nb_cli_apply_changes(vty, NULL);
}
+DEFPY_YANG (set_aspath_replace_asn,
+ set_aspath_replace_asn_cmd,
+ "set as-path replace <any|(1-4294967295)>$replace",
+ SET_STR
+ "Transform BGP AS_PATH attribute\n"
+ "Replace AS number to local AS number\n"
+ "Replace any AS number to local AS number\n"
+ "Replace a specific AS number to local AS number\n")
+{
+ const char *xpath =
+ "./set-action[action='frr-bgp-route-map:as-path-replace']";
+ char xpath_value[XPATH_MAXLEN];
+
+ nb_cli_enqueue_change(vty, xpath, NB_OP_CREATE, NULL);
+ snprintf(xpath_value, sizeof(xpath_value),
+ "%s/rmap-set-action/frr-bgp-route-map:replace-as-path", xpath);
+ nb_cli_enqueue_change(vty, xpath_value, NB_OP_MODIFY, replace);
+ return nb_cli_apply_changes(vty, NULL);
+}
+
+DEFPY_YANG (no_set_aspath_replace_asn,
+ no_set_aspath_replace_asn_cmd,
+ "no set as-path replace [<any|(1-4294967295)>]",
+ NO_STR
+ SET_STR
+ "Transform BGP AS_PATH attribute\n"
+ "Replace AS number to local AS number\n"
+ "Replace any AS number to local AS number\n"
+ "Replace a specific AS number to local AS number\n")
+{
+ const char *xpath =
+ "./set-action[action='frr-bgp-route-map:as-path-replace']";
+
+ nb_cli_enqueue_change(vty, xpath, NB_OP_DESTROY, NULL);
+ return nb_cli_apply_changes(vty, NULL);
+}
+
DEFUN_YANG (no_set_aspath_prepend,
no_set_aspath_prepend_cmd,
"no set as-path prepend [(1-4294967295)]",
route_map_install_set(&route_set_distance_cmd);
route_map_install_set(&route_set_aspath_prepend_cmd);
route_map_install_set(&route_set_aspath_exclude_cmd);
+ route_map_install_set(&route_set_aspath_replace_cmd);
route_map_install_set(&route_set_origin_cmd);
route_map_install_set(&route_set_atomic_aggregate_cmd);
route_map_install_set(&route_set_aggregator_as_cmd);
install_element(RMAP_NODE, &set_aspath_prepend_asn_cmd);
install_element(RMAP_NODE, &set_aspath_prepend_lastas_cmd);
install_element(RMAP_NODE, &set_aspath_exclude_cmd);
+ install_element(RMAP_NODE, &set_aspath_replace_asn_cmd);
install_element(RMAP_NODE, &no_set_aspath_prepend_cmd);
install_element(RMAP_NODE, &no_set_aspath_prepend_lastas_cmd);
install_element(RMAP_NODE, &no_set_aspath_exclude_cmd);
install_element(RMAP_NODE, &no_set_aspath_exclude_all_cmd);
+ install_element(RMAP_NODE, &no_set_aspath_replace_asn_cmd);
install_element(RMAP_NODE, &set_origin_cmd);
install_element(RMAP_NODE, &no_set_origin_cmd);
install_element(RMAP_NODE, &set_atomic_aggregate_cmd);
.destroy = lib_route_map_entry_set_action_rmap_set_action_exclude_as_path_destroy,
}
},
+ {
+ .xpath = "/frr-route-map:lib/route-map/entry/set-action/rmap-set-action/frr-bgp-route-map:replace-as-path",
+ .cbs = {
+ .modify = lib_route_map_entry_set_action_rmap_set_action_replace_as_path_modify,
+ .destroy = lib_route_map_entry_set_action_rmap_set_action_replace_as_path_destroy,
+ }
+ },
{
.xpath = "/frr-route-map:lib/route-map/entry/set-action/rmap-set-action/frr-bgp-route-map:community-none",
.cbs = {
int lib_route_map_entry_set_action_rmap_set_action_last_as_destroy(struct nb_cb_destroy_args *args);
int lib_route_map_entry_set_action_rmap_set_action_exclude_as_path_modify(struct nb_cb_modify_args *args);
int lib_route_map_entry_set_action_rmap_set_action_exclude_as_path_destroy(struct nb_cb_destroy_args *args);
+int lib_route_map_entry_set_action_rmap_set_action_replace_as_path_modify(
+ struct nb_cb_modify_args *args);
+int lib_route_map_entry_set_action_rmap_set_action_replace_as_path_destroy(
+ struct nb_cb_destroy_args *args);
int lib_route_map_entry_set_action_rmap_set_action_community_none_modify(struct nb_cb_modify_args *args);
int lib_route_map_entry_set_action_rmap_set_action_community_none_destroy(struct nb_cb_destroy_args *args);
int lib_route_map_entry_set_action_rmap_set_action_community_string_modify(struct nb_cb_modify_args *args);
return NB_OK;
}
+/*
+ * XPath:
+ * /frr-route-map:lib/route-map/entry/set-action/rmap-set-action/frr-bgp-route-map:replace-as-path
+ */
+int lib_route_map_entry_set_action_rmap_set_action_replace_as_path_modify(
+ struct nb_cb_modify_args *args)
+{
+ struct routemap_hook_context *rhc;
+ const char *type;
+ int rv;
+
+ switch (args->event) {
+ case NB_EV_VALIDATE:
+ case NB_EV_PREPARE:
+ case NB_EV_ABORT:
+ break;
+ case NB_EV_APPLY:
+ /* Add configuration. */
+ rhc = nb_running_get_entry(args->dnode, NULL, true);
+ type = yang_dnode_get_string(args->dnode, NULL);
+
+ /* Set destroy information. */
+ rhc->rhc_shook = generic_set_delete;
+ rhc->rhc_rule = "as-path replace";
+ rhc->rhc_event = RMAP_EVENT_SET_DELETED;
+
+ rv = generic_set_add(rhc->rhc_rmi, "as-path replace", type,
+ args->errmsg, args->errmsg_len);
+ if (rv != CMD_SUCCESS) {
+ rhc->rhc_shook = NULL;
+ return NB_ERR_INCONSISTENCY;
+ }
+ }
+
+ return NB_OK;
+}
+
+int lib_route_map_entry_set_action_rmap_set_action_replace_as_path_destroy(
+ struct nb_cb_destroy_args *args)
+{
+ switch (args->event) {
+ case NB_EV_VALIDATE:
+ case NB_EV_PREPARE:
+ case NB_EV_ABORT:
+ break;
+ case NB_EV_APPLY:
+ return lib_route_map_entry_set_destroy(args);
+ }
+
+ return NB_OK;
+}
+
/*
* XPath:
* /frr-route-map:lib/route-map/entry/set-action/rmap-set-action/frr-bgp-route-map:community-none
Prepend the existing last AS number (the leftmost ASN) to the AS_PATH.
The no form of this command removes this set operation from the route-map.
+.. clicmd:: set as-path replace <any|ASN>
+
+ Replace a specific AS number to local AS number. ``any`` replaces each
+ AS number in the AS-PATH with the local AS number.
+
.. _bgp-communities-attribute:
Communities Attribute
(strmatch(A, "frr-bgp-route-map:as-path-prepend"))
#define IS_SET_AS_EXCLUDE(A) \
(strmatch(A, "frr-bgp-route-map:as-path-exclude"))
+#define IS_SET_AS_REPLACE(A) (strmatch(A, "frr-bgp-route-map:as-path-replace"))
#define IS_SET_IPV6_NH_GLOBAL(A) \
(strmatch(A, "frr-bgp-route-map:ipv6-nexthop-global"))
#define IS_SET_IPV6_VPN_NH(A) \
yang_dnode_get_string(
dnode,
"./rmap-set-action/frr-bgp-route-map:exclude-as-path"));
+ } else if (IS_SET_AS_REPLACE(action)) {
+ vty_out(vty, " set as-path replace %s\n",
+ yang_dnode_get_string(
+ dnode,
+ "./rmap-set-action/frr-bgp-route-map:replace-as-path"));
} else if (IS_SET_AS_PREPEND(action)) {
if (yang_dnode_exists(
dnode,
--- /dev/null
+!
+router bgp 65001
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.2 remote-as external
+ neighbor 192.168.1.2 timers 3 10
+ address-family ipv4 unicast
+ neighbor 192.168.1.2 route-map r2 in
+ exit-address-family
+!
+ip prefix-list p1 seq 5 permit 172.16.255.31/32
+!
+route-map r2 permit 10
+ match ip address prefix-list p1
+ set as-path replace 65003
+route-map r2 permit 20
+ set as-path replace any
+!
--- /dev/null
+!
+interface r1-eth0
+ ip address 192.168.1.1/24
+!
+ip forwarding
+!
--- /dev/null
+!
+router bgp 65002
+ no bgp ebgp-requires-policy
+ neighbor 192.168.1.1 remote-as external
+ neighbor 192.168.1.1 timers 3 10
+ neighbor 192.168.2.1 remote-as external
+ neighbor 192.168.2.1 timers 3 10
+!
--- /dev/null
+!
+interface r2-eth0
+ ip address 192.168.1.2/24
+!
+interface r2-eth1
+ ip address 192.168.2.2/24
+!
+ip forwarding
+!
--- /dev/null
+!
+router bgp 65003
+ no bgp ebgp-requires-policy
+ neighbor 192.168.2.2 remote-as external
+ neighbor 192.168.2.2 timers 3 10
+ address-family ipv4 unicast
+ redistribute connected
+ exit-address-family
+!
--- /dev/null
+!
+int lo
+ ip address 172.16.255.31/32
+ ip address 172.16.255.32/32
+!
+interface r3-eth0
+ ip address 192.168.2.1/24
+!
+ip forwarding
+!
--- /dev/null
+#!/usr/bin/env python
+
+#
+# test_bgp_set_aspath_replace.py
+#
+# Copyright (c) 2022 by
+# Donatas Abraitis <donatas.abraitis@gmail.com>
+#
+# Permission to use, copy, modify, and/or distribute this software
+# for any purpose with or without fee is hereby granted, provided
+# that the above copyright notice and this permission notice appear
+# in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NETDEF DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NETDEF BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
+# DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+# WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
+# ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+# OF THIS SOFTWARE.
+#
+
+"""
+Test if `set as-path replace` is working correctly for route-maps.
+"""
+
+import os
+import sys
+import json
+import pytest
+import functools
+
+CWD = os.path.dirname(os.path.realpath(__file__))
+sys.path.append(os.path.join(CWD, "../"))
+
+# pylint: disable=C0413
+from lib import topotest
+from lib.topogen import Topogen, TopoRouter, get_topogen
+
+pytestmark = [pytest.mark.bgpd]
+
+
+def build_topo(tgen):
+ for routern in range(1, 5):
+ tgen.add_router("r{}".format(routern))
+
+ switch = tgen.add_switch("s1")
+ switch.add_link(tgen.gears["r1"])
+ switch.add_link(tgen.gears["r2"])
+
+ switch = tgen.add_switch("s2")
+ switch.add_link(tgen.gears["r2"])
+ switch.add_link(tgen.gears["r3"])
+
+
+def setup_module(mod):
+ tgen = Topogen(build_topo, mod.__name__)
+ tgen.start_topology()
+
+ router_list = tgen.routers()
+
+ for i, (rname, router) in enumerate(router_list.items(), 1):
+ router.load_config(
+ TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
+ )
+ router.load_config(
+ TopoRouter.RD_BGP, os.path.join(CWD, "{}/bgpd.conf".format(rname))
+ )
+
+ tgen.start_router()
+
+
+def teardown_module(mod):
+ tgen = get_topogen()
+ tgen.stop_topology()
+
+
+def test_bgp_maximum_prefix_out():
+ tgen = get_topogen()
+
+ if tgen.routers_have_failure():
+ pytest.skip(tgen.errors)
+
+ def _bgp_converge(router):
+ output = json.loads(router.vtysh_cmd("show bgp ipv4 unicast json"))
+ expected = {
+ "routes": {
+ "172.16.255.31/32": [{"path": "65002 65001"}],
+ "172.16.255.32/32": [{"path": "65001 65001"}],
+ }
+ }
+ return topotest.json_cmp(output, expected)
+
+ test_func = functools.partial(_bgp_converge, tgen.gears["r1"])
+ _, result = topotest.run_and_expect(test_func, None, count=30, wait=0.5)
+
+ assert result is None, "Failed overriding incoming AS-PATH with route-map"
+
+
+if __name__ == "__main__":
+ args = ["-s"] + sys.argv[1:]
+ sys.exit(pytest.main(args))
"Set the BGP AS-path attribute";
}
+ identity as-path-replace {
+ base frr-route-map:rmap-set-type;
+ description
+ "Replace ASNs to local AS number";
+ }
+
identity set-community {
base frr-route-map:rmap-set-type;
description
}
}
+ case as-path-replace {
+ when "derived-from-or-self(/frr-route-map:lib/frr-route-map:route-map/frr-route-map:entry/frr-route-map:set-action/frr-route-map:action, 'frr-bgp-route-map:as-path-replace')";
+ leaf replace-as-path {
+ type string;
+ description
+ "Replace ASNs to local AS number";
+ }
+ }
+
case community {
when "derived-from-or-self(/frr-route-map:lib/frr-route-map:route-map/frr-route-map:entry/frr-route-map:set-action/frr-route-map:action, 'frr-bgp-route-map:set-community')";
choice community {
projects / mirror / frr.git / commitdiff