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