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networkd: also enforce limit on total number of address/routes

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This covers the address/routers acquire dynamically.
This commit is contained in:
Lennart Poettering 2016-06-03 19:51:48 +02:00
parent a60a720c7e
commit 1b56607157
3 changed files with 63 additions and 34 deletions
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48
src/network/networkd-address.c
View File

@ -32,6 +32,7 @@
#include "utf8.h"
#include "util.h"
#define ADDRESSES_PER_LINK_MAX 2048U
#define STATIC_ADDRESSES_PER_NETWORK_MAX 1024U
int address_new(Address **ret) {
@ -392,31 +393,38 @@ int address_drop(Address *address) {
return 0;
}
int address_get(Link *link, int family, const union in_addr_union *in_addr, unsigned char prefixlen, Address **ret) {
Address address = {}, *existing;
int address_get(Link *link,
int family,
const union in_addr_union *in_addr,
unsigned char prefixlen,
Address **ret) {
Address address, *existing;
assert(link);
assert(in_addr);
assert(ret);
address.family = family;
address.in_addr = *in_addr;
address.prefixlen = prefixlen;
address = (Address) {
.family = family,
.in_addr = *in_addr,
.prefixlen = prefixlen,
};
existing = set_get(link->addresses, &address);
if (existing) {
*ret = existing;
if (ret)
*ret = existing;
return 1;
} else {
existing = set_get(link->addresses_foreign, &address);
if (!existing)
return -ENOENT;
}
*ret = existing;
existing = set_get(link->addresses_foreign, &address);
if (existing) {
if (ret)
*ret = existing;
return 0;
}
return 0;
return -ENOENT;
}
int address_remove(
@ -518,7 +526,12 @@ static int address_acquire(Link *link, Address *original, Address **ret) {
return 0;
}
int address_configure(Address *address, Link *link, sd_netlink_message_handler_t callback, bool update) {
int address_configure(
Address *address,
Link *link,
sd_netlink_message_handler_t callback,
bool update) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
int r;
@ -529,6 +542,11 @@ int address_configure(Address *address, Link *link, sd_netlink_message_handler_t
assert(link->manager);
assert(link->manager->rtnl);
/* If this is a new address, then refuse adding more than the limit */
if (address_get(link, address->family, &address->in_addr, address->prefixlen, NULL) <= 0 &&
set_size(link->addresses) >= ADDRESSES_PER_LINK_MAX)
return -E2BIG;
r = address_acquire(link, address, &address);
if (r < 0)
return r;

47
src/network/networkd-route.c
View File

@ -28,6 +28,7 @@
#include "string-util.h"
#include "util.h"
#define ROUTES_PER_LINK_MAX 2048U
#define STATIC_ROUTES_PER_NETWORK_MAX 1024U
int route_new(Route **ret) {
@ -187,39 +188,42 @@ static const struct hash_ops route_hash_ops = {
int route_get(Link *link,
int family,
union in_addr_union *dst,
const union in_addr_union *dst,
unsigned char dst_prefixlen,
unsigned char tos,
uint32_t priority,
unsigned char table,
Route **ret) {
Route route = {
Route route, *existing;
assert(link);
assert(dst);
route = (Route) {
.family = family,
.dst = *dst,
.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;
if (ret)
*ret = existing;
return 1;
} else {
existing = set_get(link->routes_foreign, &route);
if (!existing)
return -ENOENT;
}
*ret = existing;
existing = set_get(link->routes_foreign, &route);
if (existing) {
if (ret)
*ret = existing;
return 0;
}
return 0;
return -ENOENT;
}
static int route_add_internal(Link *link, Set **routes,
@ -460,8 +464,11 @@ int route_expire_handler(sd_event_source *s, uint64_t usec, void *userdata) {
return 1;
}
int route_configure(Route *route, Link *link,
sd_netlink_message_handler_t callback) {
int route_configure(
Route *route,
Link *link,
sd_netlink_message_handler_t callback) {
_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *req = NULL;
_cleanup_(sd_event_source_unrefp) sd_event_source *expire = NULL;
usec_t lifetime;
@ -473,6 +480,10 @@ int route_configure(Route *route, Link *link,
assert(link->ifindex > 0);
assert(route->family == AF_INET || route->family == AF_INET6);
if (route_get(link, route->family, &route->dst, route->dst_prefixlen, route->tos, route->priority, route->table, NULL) <= 0 &&
set_size(route->link->routes) >= ROUTES_PER_LINK_MAX)
return -E2BIG;
r = sd_rtnl_message_new_route(link->manager->rtnl, &req,
RTM_NEWROUTE, route->family,
route->protocol);

2
src/network/networkd-route.h
View File

@ -57,7 +57,7 @@ void route_free(Route *route);
int route_configure(Route *route, Link *link, sd_netlink_message_handler_t callback);
int route_remove(Route *route, Link *link, sd_netlink_message_handler_t callback);
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);
int route_get(Link *link, int family, const union in_addr_union *dst, unsigned char dst_prefixlen, unsigned char tos, uint32_t priority, unsigned char table, Route **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);
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);
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);