projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| a919525a | 2 | #include <linux/netlink.h> |
| 1d1d63b6 | 3 | #include <linux/nospec.h> |
| a919525a DA |
4 | #include <linux/rtnetlink.h> |
| 5 | #include <linux/types.h> | |
| 6 | #include <net/ip.h> | |
| 7 | #include <net/net_namespace.h> | |
| 8 | #include <net/tcp.h> | |
| 9 | ||
| 61e2bbaf | 10 | static int ip_metrics_convert(struct nlattr *fc_mx, |
| d7e774f3 DA |
11 | int fc_mx_len, u32 *metrics, |
| 12 | struct netlink_ext_ack *extack) | |
| a919525a DA |
13 | { |
| 14 | bool ecn_ca = false; | |
| 15 | struct nlattr *nla; | |
| 16 | int remaining; | |
| 17 | ||
| a919525a DA |
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; | |
| d7e774f3 DA |
24 | if (type > RTAX_MAX) { |
| 25 | NL_SET_ERR_MSG(extack, "Invalid metric type"); | |
| a919525a | 26 | return -EINVAL; |
| d7e774f3 | 27 | } |
| a919525a | 28 | |
| 1d1d63b6 | 29 | type = array_index_nospec(type, RTAX_MAX + 1); |
| a919525a DA |
30 | if (type == RTAX_CC_ALGO) { |
| 31 | char tmp[TCP_CA_NAME_MAX]; | |
| 32 | ||
| 872f6903 | 33 | nla_strscpy(tmp, nla, sizeof(tmp)); |
| 61e2bbaf | 34 | val = tcp_ca_get_key_by_name(tmp, &ecn_ca); |
| d7e774f3 DA |
35 | if (val == TCP_CA_UNSPEC) { |
| 36 | NL_SET_ERR_MSG(extack, "Unknown tcp congestion algorithm"); | |
| a919525a | 37 | return -EINVAL; |
| d7e774f3 | 38 | } |
| a919525a | 39 | } else { |
| d7e774f3 DA |
40 | if (nla_len(nla) != sizeof(u32)) { |
| 41 | NL_SET_ERR_MSG_ATTR(extack, nla, | |
| 42 | "Invalid attribute in metrics"); | |
| 5b5e7a0d | 43 | return -EINVAL; |
| d7e774f3 | 44 | } |
| a919525a DA |
45 | val = nla_get_u32(nla); |
| 46 | } | |
| 47 | if (type == RTAX_ADVMSS && val > 65535 - 40) | |
| 48 | val = 65535 - 40; | |
| 49 | if (type == RTAX_MTU && val > 65535 - 15) | |
| 50 | val = 65535 - 15; | |
| 51 | if (type == RTAX_HOPLIMIT && val > 255) | |
| 52 | val = 255; | |
| d7e774f3 DA |
53 | if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK)) { |
| 54 | NL_SET_ERR_MSG(extack, "Unknown flag set in feature mask in metrics attribute"); | |
| a919525a | 55 | return -EINVAL; |
| d7e774f3 | 56 | } |
| a919525a DA |
57 | metrics[type - 1] = val; |
| 58 | } | |
| 59 | ||
| 60 | if (ecn_ca) | |
| 61 | metrics[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA; | |
| 62 | ||
| 63 | return 0; | |
| 64 | } | |
| 767a2217 | 65 | |
| 61e2bbaf | 66 | struct dst_metrics *ip_fib_metrics_init(struct nlattr *fc_mx, |
| d7e774f3 DA |
67 | int fc_mx_len, |
| 68 | struct netlink_ext_ack *extack) | |
| 767a2217 DA |
69 | { |
| 70 | struct dst_metrics *fib_metrics; | |
| 71 | int err; | |
| 72 | ||
| 73 | if (!fc_mx) | |
| 74 | return (struct dst_metrics *)&dst_default_metrics; | |
| 75 | ||
| 76 | fib_metrics = kzalloc(sizeof(*fib_metrics), GFP_KERNEL); | |
| 77 | if (unlikely(!fib_metrics)) | |
| 78 | return ERR_PTR(-ENOMEM); | |
| 79 | ||
| 61e2bbaf | 80 | err = ip_metrics_convert(fc_mx, fc_mx_len, fib_metrics->metrics, |
| d7e774f3 | 81 | extack); |
| 767a2217 DA |
82 | if (!err) { |
| 83 | refcount_set(&fib_metrics->refcnt, 1); | |
| 84 | } else { | |
| 85 | kfree(fib_metrics); | |
| 86 | fib_metrics = ERR_PTR(err); | |
| 87 | } | |
| 88 | ||
| 89 | return fib_metrics; | |
| 90 | } | |
| 91 | EXPORT_SYMBOL_GPL(ip_fib_metrics_init); |