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92 lines
2.2 KiB
92 lines
2.2 KiB
// 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_strscpy(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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