1 #include <linux/netlink.h>
2 #include <linux/rtnetlink.h>
3 #include <linux/types.h>
4 #include <net/ip.h>
5 #include <net/net_namespace.h>
6 #include <net/tcp.h>
7
ip_metrics_convert(struct net * net,struct nlattr * fc_mx,int fc_mx_len,u32 * metrics)8 int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len,
9 u32 *metrics)
10 {
11 bool ecn_ca = false;
12 struct nlattr *nla;
13 int remaining;
14
15 if (!fc_mx)
16 return 0;
17
18 nla_for_each_attr(nla, fc_mx, fc_mx_len, remaining) {
19 int type = nla_type(nla);
20 u32 val;
21
22 if (!type)
23 continue;
24 if (type > RTAX_MAX)
25 return -EINVAL;
26
27 if (type == RTAX_CC_ALGO) {
28 char tmp[TCP_CA_NAME_MAX];
29
30 nla_strlcpy(tmp, nla, sizeof(tmp));
31 val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca);
32 if (val == TCP_CA_UNSPEC)
33 return -EINVAL;
34 } else {
35 if (nla_len(nla) != sizeof(u32))
36 return -EINVAL;
37 val = nla_get_u32(nla);
38 }
39 if (type == RTAX_ADVMSS && val > 65535 - 40)
40 val = 65535 - 40;
41 if (type == RTAX_MTU && val > 65535 - 15)
42 val = 65535 - 15;
43 if (type == RTAX_HOPLIMIT && val > 255)
44 val = 255;
45 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
46 return -EINVAL;
47 metrics[type - 1] = val;
48 }
49
50 if (ecn_ca)
51 metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
52
53 return 0;
54 }
55 EXPORT_SYMBOL_GPL(ip_metrics_convert);
56
