networkd-route.c revision 3b015d40c19d9338b66bf916d84dec601019c811
/*-*- 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 "alloc-util.h"
#include "conf-parser.h"
#include "event-util.h"
#include "in-addr-util.h"
#include "netlink-util.h"
#include "networkd-route.h"
#include "networkd.h"
#include "parse-util.h"
#include "set.h"
#include "string-util.h"
#include "util.h"
int route_new(Route **ret) {
_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 = RTPROT_UNSPEC;
route->table = RT_TABLE_DEFAULT;
route->lifetime = USEC_INFINITY;
*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);
if (r < 0)
return r;
route->protocol = RTPROT_STATIC;
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));
}
if (route->link) {
set_remove(route->link->routes, route);
set_remove(route->link->routes_foreign, route);
}
sd_event_source_unref(route->expire);
free(route);
}
static void route_hash_func(const void *b, struct siphash *state) {
const Route *route = b;
assert(route);
siphash24_compress(&route->family, sizeof(route->family), state);
switch (route->family) {
case AF_INET:
case AF_INET6:
/* Equality of routes are given by the 4-touple
(dst_prefix,dst_prefixlen,tos,priority,table) */
siphash24_compress(&route->dst, FAMILY_ADDRESS_SIZE(route->family), state);
siphash24_compress(&route->dst_prefixlen, sizeof(route->dst_prefixlen), state);
siphash24_compress(&route->tos, sizeof(route->tos), state);
siphash24_compress(&route->priority, sizeof(route->priority), state);
siphash24_compress(&route->table, sizeof(route->table), state);
break;
default:
/* treat any other address family as AF_UNSPEC */
break;
}
}
static int route_compare_func(const void *_a, const void *_b) {
const Route *a = _a, *b = _b;
if (a->family < b->family)
return -1;
if (a->family > b->family)
return 1;
switch (a->family) {
case AF_INET:
case AF_INET6:
if (a->dst_prefixlen < b->dst_prefixlen)
return -1;
if (a->dst_prefixlen > b->dst_prefixlen)
return 1;
if (a->tos < b->tos)
return -1;
if (a->tos > b->tos)
return 1;
if (a->priority < b->priority)
return -1;
if (a->priority > b->priority)
return 1;
if (a->table < b->table)
return -1;
if (a->table > b->table)
return 1;
return memcmp(&a->dst, &b->dst, FAMILY_ADDRESS_SIZE(a->family));
default:
/* treat any other address family as AF_UNSPEC */
return 0;
}
}
static const struct hash_ops route_hash_ops = {
.hash = route_hash_func,
.compare = route_compare_func
};
int route_get(Link *link,
int family,
union in_addr_union *dst,
unsigned char dst_prefixlen,
unsigned char tos,
uint32_t priority,
unsigned char table,
Route **ret) {
Route route = {
.family = family,
.dst_prefixlen = dst_prefixlen,
.tos = tos,
.priority = priority,
.table = table,
}, *existing;
assert(link);
assert(dst);
assert(ret);
route.dst = *dst;
existing = set_get(link->routes, &route);
if (existing) {
*ret = existing;
return 1;
} else {
existing = set_get(link->routes_foreign, &route);
if (!existing)
return -ENOENT;
}
*ret = existing;
return 0;
}
static int route_add_internal(Link *link, Set **routes,
int family,
union in_addr_union *dst,
unsigned char dst_prefixlen,
unsigned char tos,
uint32_t priority,
unsigned char table, Route **ret) {
_cleanup_route_free_ Route *route = NULL;
int r;
assert(link);
assert(routes);
assert(dst);
r = route_new(&route);
if (r < 0)
return r;
route->family = family;
route->dst = *dst;
route->dst_prefixlen = dst_prefixlen;
route->tos = tos;
route->priority = priority;
route->table = table;
r = set_ensure_allocated(routes, &route_hash_ops);
if (r < 0)
return r;
r = set_put(*routes, route);
if (r < 0)
return r;
route->link = link;
if (ret)
*ret = route;
route = NULL;
return 0;
}
int route_add_foreign(Link *link,
int family,
union in_addr_union *dst,
unsigned char dst_prefixlen,
unsigned char tos,
uint32_t priority,
unsigned char table, Route **ret) {
return route_add_internal(link, &link->routes_foreign, family, dst, dst_prefixlen, tos, priority, table, ret);
}
int route_add(Link *link,
int family,
union in_addr_union *dst,
unsigned char dst_prefixlen,
unsigned char tos,
uint32_t priority,
unsigned char table, Route **ret) {
Route *route;
int r;
r = route_get(link, family, dst, dst_prefixlen, tos, priority, table, &route);
if (r == -ENOENT) {
/* Route does not exist, create a new one */
r = route_add_internal(link, &link->routes, family, dst, dst_prefixlen, tos, priority, table, &route);
if (r < 0)
return r;
} else if (r == 0) {
/* Take over a foreign route */
r = set_ensure_allocated(&link->routes, &route_hash_ops);
if (r < 0)
return r;
r = set_put(link->routes, route);
if (r < 0)
return r;
set_remove(link->routes_foreign, route);
} else if (r == 1) {
/* Route exists, do nothing */
;
} else
return r;
*ret = route;
return 0;
}
int route_update(Route *route,
union in_addr_union *src,
unsigned char src_prefixlen,
union in_addr_union *gw,
union in_addr_union *prefsrc,
unsigned char scope,
unsigned char protocol) {
assert(route);
assert(src);
assert(gw);
assert(prefsrc);
route->src = *src;
route->src_prefixlen = src_prefixlen;
route->gw = *gw;
route->prefsrc = *prefsrc;
route->scope = scope;
route->protocol = protocol;
return 0;
}
void route_drop(Route *route) {
assert(route);
route_free(route);
}
int route_remove(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->gw)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->gw.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->gw.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.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst.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.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src.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)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc.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->priority);
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_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) {
Route *route = userdata;
int r;
assert(route);
r = route_remove(route, route->link, NULL);
if (r < 0)
log_warning_errno(r, "Could not remove route: %m");
return 1;
}
int route_configure(Route *route, Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_netlink_message_unref_ sd_netlink_message *req = NULL;
_cleanup_event_source_unref_ sd_event_source *expire = NULL;
usec_t lifetime;
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->gw)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_GATEWAY, &route->gw.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_GATEWAY, &route->gw.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.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_DST, &route->dst.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.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_SRC, &route->src.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)) {
if (route->family == AF_INET)
r = sd_netlink_message_append_in_addr(req, RTA_PREFSRC, &route->prefsrc.in);
else if (route->family == AF_INET6)
r = sd_netlink_message_append_in6_addr(req, RTA_PREFSRC, &route->prefsrc.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_rtnl_message_route_set_flags(req, route->flags);
if (r < 0)
return log_error_errno(r, "Colud not set flags: %m");
r = sd_netlink_message_append_u32(req, RTA_PRIORITY, route->priority);
if (r < 0)
return log_error_errno(r, "Could not append RTA_PRIORITY attribute: %m");
r = sd_netlink_message_append_u8(req, RTA_PREF, route->pref);
if (r < 0)
return log_error_errno(r, "Could not append RTA_PREF 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);
lifetime = route->lifetime;
r = route_add(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, &route);
if (r < 0)
return log_error_errno(r, "Could not add route: %m");
/* TODO: drop expiration handling once it can be pushed into the kernel */
route->lifetime = lifetime;
if (route->lifetime != USEC_INFINITY) {
r = sd_event_add_time(link->manager->event, &expire, clock_boottime_or_monotonic(),
route->lifetime, 0, route_expire_handler, route);
if (r < 0)
return log_error_errno(r, "Could not arm expiration timer: %m");
}
sd_event_source_unref(route->expire);
route->expire = expire;
expire = NULL;
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->gw = 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 = 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 = buffer;
n->dst_prefixlen = prefixlen;
} else if (streq(lvalue, "Source")) {
n->src = 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_uint32(unit, filename, line, section,
section_line, lvalue, ltype,
rvalue, &n->priority, 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;
}