93 lines
2.2 KiB
C
93 lines
2.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
#include <linux/netlink.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/types.h>
|
|
#include <net/ip.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/tcp.h>
|
|
|
|
static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx,
|
|
int fc_mx_len, u32 *metrics,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
bool ecn_ca = false;
|
|
struct nlattr *nla;
|
|
int remaining;
|
|
|
|
if (!fc_mx)
|
|
return 0;
|
|
|
|
nla_for_each_attr(nla, fc_mx, fc_mx_len, remaining) {
|
|
int type = nla_type(nla);
|
|
u32 val;
|
|
|
|
if (!type)
|
|
continue;
|
|
if (type > RTAX_MAX) {
|
|
NL_SET_ERR_MSG(extack, "Invalid metric type");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (type == RTAX_CC_ALGO) {
|
|
char tmp[TCP_CA_NAME_MAX];
|
|
|
|
nla_strscpy(tmp, nla, sizeof(tmp));
|
|
val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
|
|
if (val == TCP_CA_UNSPEC) {
|
|
NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm");
|
|
return -EINVAL;
|
|
}
|
|
} else {
|
|
if (nla_len(nla) != sizeof(u32)) {
|
|
NL_SET_ERR_MSG_ATTR(extack, nla,
|
|
"Invalid attribute in metrics");
|
|
return -EINVAL;
|
|
}
|
|
val = nla_get_u32(nla);
|
|
}
|
|
if (type == RTAX_ADVMSS && val > 65535 - 40)
|
|
val = 65535 - 40;
|
|
if (type == RTAX_MTU && val > 65535 - 15)
|
|
val = 65535 - 15;
|
|
if (type == RTAX_HOPLIMIT && val > 255)
|
|
val = 255;
|
|
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) {
|
|
NL_SET_ERR_MSG(extack, "Unknown flag set in feature mask in metrics attribute");
|
|
return -EINVAL;
|
|
}
|
|
metrics[type - 1] = val;
|
|
}
|
|
|
|
if (ecn_ca)
|
|
metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx,
|
|
int fc_mx_len,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct dst_metrics *fib_metrics;
|
|
int err;
|
|
|
|
if (!fc_mx)
|
|
return (struct dst_metrics *)&dst_default_metrics;
|
|
|
|
fib_metrics = kzalloc(sizeof(*fib_metrics), GFP_KERNEL);
|
|
if (unlikely(!fib_metrics))
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics,
|
|
extack);
|
|
if (!err) {
|
|
refcount_set(&fib_metrics->refcnt, 1);
|
|
} else {
|
|
kfree(fib_metrics);
|
|
fib_metrics = ERR_PTR(err);
|
|
}
|
|
|
|
return fib_metrics;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip_fib_metrics_init);
|