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 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 val = nla_get_u32(nla); 36 } 37 if (type == RTAX_ADVMSS && val > 65535 - 40) 38 val = 65535 - 40; 39 if (type == RTAX_MTU && val > 65535 - 15) 40 val = 65535 - 15; 41 if (type == RTAX_HOPLIMIT && val > 255) 42 val = 255; 43 if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) 44 return -EINVAL; 45 metrics[type - 1] = val; 46 } 47 48 if (ecn_ca) 49 metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; 50 51 return 0; 52 } 53 EXPORT_SYMBOL_GPL(ip_metrics_convert); 54