#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> int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, int fc_mx_len, u32 *metrics) { 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) return -EINVAL; if (type == RTAX_CC_ALGO) { char tmp[TCP_CA_NAME_MAX]; nla_strlcpy(tmp, nla, sizeof(tmp)); val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca); if (val == TCP_CA_UNSPEC) return -EINVAL; } else { if (nla_len(nla) != sizeof(u32)) 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)) return -EINVAL; metrics[type - 1] = val; } if (ecn_ca) metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; return 0; } EXPORT_SYMBOL_GPL(ip_metrics_convert);