| #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); |