| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 | 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); |