LCOV - code coverage report
Current view: top level - net/ipv4 - metrics.c (source / functions) Hit Total Coverage
Test: landlock.info Lines: 5 48 10.4 %
Date: 2021-04-22 12:43:58 Functions: 1 2 50.0 %

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

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