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network: dhcp4: introduce link_set_dhcp_static_routes()

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This commit is contained in:
Yu Watanabe 2021-04-12 08:22:24 +09:00
parent c0fef8f349
commit 7872d0f7b6
1 changed files with 89 additions and 63 deletions
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152
src/network/networkd-dhcp4.c
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@ -266,13 +266,94 @@ static int link_set_dhcp_prefix_route(Link *link) {
return dhcp_route_configure(route, link);
}
static int link_set_dhcp_routes(Link *link) {
static int link_set_dhcp_static_routes(Link *link) {
_cleanup_free_ sd_dhcp_route **static_routes = NULL;
bool classless_route = false, static_route = false;
_cleanup_(route_freep) Route *route = NULL;
struct in_addr address;
int n, r;
assert(link);
assert(link->dhcp_lease);
if (!link->network->dhcp_use_routes)
return 0;
r = sd_dhcp_lease_get_address(link->dhcp_lease, &address);
if (r < 0)
return r;
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (IN_SET(n, 0, -ENODATA)) {
log_link_debug(link, "DHCP: No static routes received from DHCP server.");
return 0;
}
if (n < 0)
return n;
for (int i = 0; i < n; i++) {
switch (sd_dhcp_route_get_option(static_routes[i])) {
case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
classless_route = true;
break;
case SD_DHCP_OPTION_STATIC_ROUTE:
static_route = true;
break;
}
}
/* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
* the DHCP client MUST ignore the Static Routes option. */
if (classless_route && static_route)
log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option");
r = route_new(&route);
if (r < 0)
return r;
route->family = AF_INET;
route->gw_family = AF_INET;
route->protocol = RTPROT_DHCP;
route->priority = link->network->dhcp_route_metric;
route->table = link_get_dhcp_route_table(link);
route->mtu = link->network->dhcp_route_mtu;
for (int i = 0; i < n; i++) {
if (sd_dhcp_route_get_option(static_routes[i]) !=
(classless_route ? SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE : SD_DHCP_OPTION_STATIC_ROUTE))
continue;
r = sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination(static_routes[i], &route->dst.in);
if (r < 0)
return r;
r = sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen);
if (r < 0)
return r;
route->scope = route_scope_from_address(route, &address);
if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
route->prefsrc.in = address;
else
route->prefsrc = IN_ADDR_NULL;
r = dhcp_route_configure(route, link);
if (r < 0)
return r;
}
return classless_route;
}
static int link_set_dhcp_routes(Link *link) {
struct in_addr address;
uint32_t table;
Route *rt;
int r, n;
int r;
assert(link);
@ -303,65 +384,14 @@ static int link_set_dhcp_routes(Link *link) {
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not set prefix route: %m");
n = sd_dhcp_lease_get_routes(link->dhcp_lease, &static_routes);
if (n == -ENODATA)
log_link_debug_errno(link, n, "DHCP: No routes received from DHCP server: %m");
else if (n < 0)
return log_link_error_errno(link, n, "DHCP: could not get routes: %m");
for (int i = 0; i < n; i++) {
switch (sd_dhcp_route_get_option(static_routes[i])) {
case SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE:
classless_route = true;
break;
case SD_DHCP_OPTION_STATIC_ROUTE:
static_route = true;
break;
}
}
if (link->network->dhcp_use_routes) {
/* if the DHCP server returns both a Classless Static Routes option and a Static Routes option,
* the DHCP client MUST ignore the Static Routes option. */
if (classless_route && static_route)
log_link_warning(link, "Classless static routes received from DHCP server: ignoring static-route option");
for (int i = 0; i < n; i++) {
_cleanup_(route_freep) Route *route = NULL;
if (classless_route &&
sd_dhcp_route_get_option(static_routes[i]) != SD_DHCP_OPTION_CLASSLESS_STATIC_ROUTE)
continue;
r = route_new(&route);
if (r < 0)
return log_link_error_errno(link, r, "Could not allocate route: %m");
route->family = AF_INET;
route->protocol = RTPROT_DHCP;
route->gw_family = AF_INET;
assert_se(sd_dhcp_route_get_gateway(static_routes[i], &route->gw.in) >= 0);
assert_se(sd_dhcp_route_get_destination(static_routes[i], &route->dst.in) >= 0);
assert_se(sd_dhcp_route_get_destination_prefix_length(static_routes[i], &route->dst_prefixlen) >= 0);
route->priority = link->network->dhcp_route_metric;
route->table = table;
route->mtu = link->network->dhcp_route_mtu;
route->scope = route_scope_from_address(route, &address);
if (IN_SET(route->scope, RT_SCOPE_LINK, RT_SCOPE_UNIVERSE))
route->prefsrc.in = address;
if (set_contains(link->dhcp_routes, route))
continue;
r = dhcp_route_configure(route, link);
if (r < 0)
return log_link_error_errno(link, r, "Could not set route: %m");
}
}
if (link->network->dhcp_use_gateway) {
r = link_set_dhcp_static_routes(link);
if (r < 0)
return log_link_error_errno(link, r, "DHCP error: Could not set static routes: %m");
if (r == 0 && link->network->dhcp_use_gateway) {
const struct in_addr *router;
/* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
* a Router option, the DHCP client MUST ignore the Router option. */
r = sd_dhcp_lease_get_router(link->dhcp_lease, &router);
if (IN_SET(r, 0, -ENODATA))
log_link_info(link, "DHCP: No gateway received from DHCP server.");
@ -369,10 +399,6 @@ static int link_set_dhcp_routes(Link *link) {
return log_link_error_errno(link, r, "DHCP error: could not get gateway: %m");
else if (in4_addr_is_null(&router[0]))
log_link_info(link, "DHCP: Received gateway is null.");
else if (classless_route)
/* According to RFC 3442: If the DHCP server returns both a Classless Static Routes option and
* a Router option, the DHCP client MUST ignore the Router option. */
log_link_warning(link, "Classless static routes received from DHCP server: ignoring router option");
else {
_cleanup_(route_freep) Route *route = NULL, *route_gw = NULL;