Commit | Line | Data |
---|---|---|
457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
a919525a DA |
2 | #include <linux/netlink.h> |
3 | #include <linux/rtnetlink.h> | |
4 | #include <linux/types.h> | |
5 | #include <net/ip.h> | |
6 | #include <net/net_namespace.h> | |
7 | #include <net/tcp.h> | |
8 | ||
767a2217 | 9 | static int ip_metrics_convert(struct net *net, struct nlattr *fc_mx, |
d7e774f3 DA |
10 | int fc_mx_len, u32 *metrics, |
11 | struct netlink_ext_ack *extack) | |
a919525a DA |
12 | { |
13 | bool ecn_ca = false; | |
14 | struct nlattr *nla; | |
15 | int remaining; | |
16 | ||
17 | if (!fc_mx) | |
18 | return 0; | |
19 | ||
20 | nla_for_each_attr(nla, fc_mx, fc_mx_len, remaining) { | |
21 | int type = nla_type(nla); | |
22 | u32 val; | |
23 | ||
24 | if (!type) | |
25 | continue; | |
d7e774f3 DA |
26 | if (type > RTAX_MAX) { |
27 | NL_SET_ERR_MSG(extack, "Invalid metric type"); | |
a919525a | 28 | return -EINVAL; |
d7e774f3 | 29 | } |
a919525a DA |
30 | |
31 | if (type == RTAX_CC_ALGO) { | |
32 | char tmp[TCP_CA_NAME_MAX]; | |
33 | ||
872f6903 | 34 | nla_strscpy(tmp, nla, sizeof(tmp)); |
a919525a | 35 | val = tcp_ca_get_key_by_name(net, tmp, &ecn_ca); |
d7e774f3 DA |
36 | if (val == TCP_CA_UNSPEC) { |
37 | NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm"); | |
a919525a | 38 | return -EINVAL; |
d7e774f3 | 39 | } |
a919525a | 40 | } else { |
d7e774f3 DA |
41 | if (nla_len(nla) != sizeof(u32)) { |
42 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
43 | "Invalid attribute in metrics"); | |
5b5e7a0d | 44 | return -EINVAL; |
d7e774f3 | 45 | } |
a919525a DA |
46 | val = nla_get_u32(nla); |
47 | } | |
48 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
49 | val = 65535 - 40; | |
50 | if (type == RTAX_MTU && val > 65535 - 15) | |
51 | val = 65535 - 15; | |
52 | if (type == RTAX_HOPLIMIT && val > 255) | |
53 | val = 255; | |
d7e774f3 DA |
54 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) { |
55 | NL_SET_ERR_MSG(extack, "Unknown flag set in feature mask in metrics attribute"); | |
a919525a | 56 | return -EINVAL; |
d7e774f3 | 57 | } |
a919525a DA |
58 | metrics[type - 1] = val; |
59 | } | |
60 | ||
61 | if (ecn_ca) | |
62 | metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
63 | ||
64 | return 0; | |
65 | } | |
767a2217 DA |
66 | |
67 | struct dst_metrics *ip_fib_metrics_init(struct net *net, struct nlattr *fc_mx, | |
d7e774f3 DA |
68 | int fc_mx_len, |
69 | struct netlink_ext_ack *extack) | |
767a2217 DA |
70 | { |
71 | struct dst_metrics *fib_metrics; | |
72 | int err; | |
73 | ||
74 | if (!fc_mx) | |
75 | return (struct dst_metrics *)&dst_default_metrics; | |
76 | ||
77 | fib_metrics = kzalloc(sizeof(*fib_metrics), GFP_KERNEL); | |
78 | if (unlikely(!fib_metrics)) | |
79 | return ERR_PTR(-ENOMEM); | |
80 | ||
d7e774f3 DA |
81 | err = ip_metrics_convert(net, fc_mx, fc_mx_len, fib_metrics->metrics, |
82 | extack); | |
767a2217 DA |
83 | if (!err) { |
84 | refcount_set(&fib_metrics->refcnt, 1); | |
85 | } else { | |
86 | kfree(fib_metrics); | |
87 | fib_metrics = ERR_PTR(err); | |
88 | } | |
89 | ||
90 | return fib_metrics; | |
91 | } | |
92 | EXPORT_SYMBOL_GPL(ip_fib_metrics_init); |