networkd-route.c revision f0213e3796b4dd66e546e2de4d677db319f9171b
/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
/***
This file is part of systemd.
Copyright 2013 Tom Gundersen <teg@jklm.no>
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
systemd 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with systemd; If not, see <http://www.gnu.org/licenses/>.
***/
#include "util.h"
#include "conf-parser.h"
#include "netlink-util.h"
#include "networkd.h"
#include "networkd-route.h"
int route_new(Route **ret, unsigned char rtm_protocol) {
_cleanup_route_free_ Route *route = NULL;
route = new0(Route, 1);
if (!route)
return -ENOMEM;
route->family = AF_UNSPEC;
route->scope = RT_SCOPE_UNIVERSE;
route->protocol = rtm_protocol;
*ret = route;
route = NULL;
return 0;
}
int route_new_static(Network *network, unsigned section, Route **ret) {
_cleanup_route_free_ Route *route = NULL;
int r;
if (section) {
route = hashmap_get(network->routes_by_section,
UINT_TO_PTR(section));
if (route) {
*ret = route;
route = NULL;
return 0;
}
}
r = route_new(&route, RTPROT_STATIC);
if (r < 0)
return r;
route->network = network;
LIST_PREPEND(routes, network->static_routes, route);
if (section) {
route->section = section;
hashmap_put(network->routes_by_section,
UINT_TO_PTR(route->section), route);
}
*ret = route;
route = NULL;
return 0;
}
void route_free(Route *route) {
if (!route)
return;
if (route->network) {
LIST_REMOVE(routes, route->network->static_routes, route);
if (route->section)
hashmap_remove(route->network->routes_by_section,
UINT_TO_PTR(route->section));
}
free(route);
}
int route_drop(Route *route, Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(link->ifindex > 0);
assert(route->family == AF_INET || route->family == AF_INET6);
r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
RTM_DELROUTE, route->family,
route->protocol);
if (r < 0)
return log_error_errno(r, "Could not create RTM_DELROUTE message: %m");
if (!in_addr_is_null(route->family, &route->in_addr)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->in_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->in_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
}
if (route->dst_prefixlen) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_DST, &route->dst_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_DST attribute: %m");
r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set destination prefix length: %m");
}
if (route->src_prefixlen) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_SRC, &route->src_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_DST attribute: %m");
r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set source prefix length: %m");
}
if (!in_addr_is_null(route->family, &route->prefsrc_addr)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_PREFSRC attribute: %m");
}
r = sd_rtnl_message_route_set_scope(req, route->scope);
if (r < 0)
return log_error_errno(r, "Could not set scope: %m");
r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->metrics);
if (r < 0)
return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
if (r < 0)
return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
int route_configure(Route *route, Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
int r;
assert(link);
assert(link->manager);
assert(link->manager->rtnl);
assert(link->ifindex > 0);
assert(route->family == AF_INET || route->family == AF_INET6);
r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
RTM_NEWROUTE, route->family,
route->protocol);
if (r < 0)
return log_error_errno(r, "Could not create RTM_NEWROUTE message: %m");
if (!in_addr_is_null(route->family, &route->in_addr)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->in_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->in_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_GATEWAY attribute: %m");
}
if (route->dst_prefixlen) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_DST, &route->dst_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_DST attribute: %m");
r = sd_rtnl_message_route_set_dst_prefixlen(req, route->dst_prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set destination prefix length: %m");
}
if (route->src_prefixlen) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_SRC, &route->src_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_SRC attribute: %m");
r = sd_rtnl_message_route_set_src_prefixlen(req, route->src_prefixlen);
if (r < 0)
return log_error_errno(r, "Could not set source prefix length: %m");
}
if (!in_addr_is_null(route->family, &route->prefsrc_addr)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc_addr.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc_addr.in6);
if (r < 0)
return log_error_errno(r, "Could not append RTA_PREFSRC attribute: %m");
}
r = sd_rtnl_message_route_set_scope(req, route->scope);
if (r < 0)
return log_error_errno(r, "Could not set scope: %m");
r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->metrics);
if (r < 0)
return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
r = sd_netlink_message_append_u32(req, RTA_OIF, link->ifindex);
if (r < 0)
return log_error_errno(r, "Could not append RTA_OIF attribute: %m");
r = sd_netlink_call_async(link->manager->rtnl, req, callback, link, 0, NULL);
if (r < 0)
return log_error_errno(r, "Could not send rtnetlink message: %m");
link_ref(link);
return 0;
}
int config_parse_gateway(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_route_free_ Route *n = NULL;
union in_addr_union buffer;
int r, f;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
if (streq(section, "Network")) {
/* we are not in an Route section, so treat
* this as the special '0' section */
section_line = 0;
}
r = route_new_static(network, section_line, &n);
if (r < 0)
return r;
r = in_addr_from_string_auto(rvalue, &f, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Route is invalid, ignoring assignment: %s", rvalue);
return 0;
}
n->family = f;
n->in_addr = buffer;
n = NULL;
return 0;
}
int config_parse_preferred_src(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_route_free_ Route *n = NULL;
union in_addr_union buffer;
int r, f;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, section_line, &n);
if (r < 0)
return r;
r = in_addr_from_string_auto(rvalue, &f, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, EINVAL,
"Preferred source is invalid, ignoring assignment: %s", rvalue);
return 0;
}
n->family = f;
n->prefsrc_addr = buffer;
n = NULL;
return 0;
}
int config_parse_destination(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_route_free_ Route *n = NULL;
const char *address, *e;
union in_addr_union buffer;
unsigned char prefixlen;
int r, f;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, section_line, &n);
if (r < 0)
return r;
/* Destination|Source=address/prefixlen */
/* address */
e = strchr(rvalue, '/');
if (e)
address = strndupa(rvalue, e - rvalue);
else
address = rvalue;
r = in_addr_from_string_auto(address, &f, &buffer);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Destination is invalid, ignoring assignment: %s", address);
return 0;
}
if (f != AF_INET && f != AF_INET6) {
log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown address family, ignoring assignment: %s", address);
return 0;
}
/* prefixlen */
if (e) {
r = safe_atou8(e + 1, &prefixlen);
if (r < 0) {
log_syntax(unit, LOG_ERR, filename, line, r, "Route destination prefix length is invalid, ignoring assignment: %s", e + 1);
return 0;
}
} else {
switch (f) {
case AF_INET:
prefixlen = 32;
break;
case AF_INET6:
prefixlen = 128;
break;
}
}
n->family = f;
if (streq(lvalue, "Destination")) {
n->dst_addr = buffer;
n->dst_prefixlen = prefixlen;
} else if (streq(lvalue, "Source")) {
n->src_addr = buffer;
n->src_prefixlen = prefixlen;
} else
assert_not_reached(lvalue);
n = NULL;
return 0;
}
int config_parse_route_priority(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_route_free_ Route *n = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, section_line, &n);
if (r < 0)
return r;
r = config_parse_unsigned(unit, filename, line, section,
section_line, lvalue, ltype,
rvalue, &n->metrics, userdata);
if (r < 0)
return r;
n = NULL;
return 0;
}
int config_parse_route_scope(const char *unit,
const char *filename,
unsigned line,
const char *section,
unsigned section_line,
const char *lvalue,
int ltype,
const char *rvalue,
void *data,
void *userdata) {
Network *network = userdata;
_cleanup_route_free_ Route *n = NULL;
int r;
assert(filename);
assert(section);
assert(lvalue);
assert(rvalue);
assert(data);
r = route_new_static(network, section_line, &n);
if (r < 0)
return r;
if (streq(rvalue, "host"))
n->scope = RT_SCOPE_HOST;
else if (streq(rvalue, "link"))
n->scope = RT_SCOPE_LINK;
else if (streq(rvalue, "global"))
n->scope = RT_SCOPE_UNIVERSE;
else {
log_syntax(unit, LOG_ERR, filename, line, 0, "Unknown route scope: %s", rvalue);
return 0;
}
n = NULL;
return 0;
}