diff options
Diffstat (limited to 'net/core/fib_rules.c')
| -rw-r--r-- | net/core/fib_rules.c | 78 |
1 files changed, 76 insertions, 2 deletions
diff --git a/net/core/fib_rules.c b/net/core/fib_rules.c index be4629c344a6..b6791d94841d 100644 --- a/net/core/fib_rules.c +++ b/net/core/fib_rules.c @@ -18,6 +18,11 @@ #include <net/fib_rules.h> #include <net/ip_tunnels.h> +static const struct fib_kuid_range fib_kuid_range_unset = { + KUIDT_INIT(0), + KUIDT_INIT(~0), +}; + int fib_default_rule_add(struct fib_rules_ops *ops, u32 pref, u32 table, u32 flags) { @@ -33,6 +38,7 @@ int fib_default_rule_add(struct fib_rules_ops *ops, r->table = table; r->flags = flags; r->fr_net = ops->fro_net; + r->uid_range = fib_kuid_range_unset; r->suppress_prefixlen = -1; r->suppress_ifgroup = -1; @@ -172,6 +178,34 @@ void fib_rules_unregister(struct fib_rules_ops *ops) } EXPORT_SYMBOL_GPL(fib_rules_unregister); +static int uid_range_set(struct fib_kuid_range *range) +{ + return uid_valid(range->start) && uid_valid(range->end); +} + +static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb) +{ + struct fib_rule_uid_range *in; + struct fib_kuid_range out; + + in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]); + + out.start = make_kuid(current_user_ns(), in->start); + out.end = make_kuid(current_user_ns(), in->end); + + return out; +} + +static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range) +{ + struct fib_rule_uid_range out = { + from_kuid_munged(current_user_ns(), range->start), + from_kuid_munged(current_user_ns(), range->end) + }; + + return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out); +} + static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, struct flowi *fl, int flags, struct fib_lookup_arg *arg) @@ -193,6 +227,10 @@ static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops, if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg)) goto out; + if (uid_lt(fl->flowi_uid, rule->uid_range.start) || + uid_gt(fl->flowi_uid, rule->uid_range.end)) + goto out; + ret = ops->match(rule, fl, flags); out: return (rule->flags & FIB_RULE_INVERT) ? !ret : ret; @@ -305,6 +343,10 @@ static int rule_exists(struct fib_rules_ops *ops, struct fib_rule_hdr *frh, if (r->l3mdev != rule->l3mdev) continue; + if (!uid_eq(r->uid_range.start, rule->uid_range.start) || + !uid_eq(r->uid_range.end, rule->uid_range.end)) + continue; + if (!ops->compare(r, frh, tb)) continue; return 1; @@ -429,6 +471,21 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh) if (rule->l3mdev && rule->table) goto errout_free; + if (tb[FRA_UID_RANGE]) { + if (current_user_ns() != net->user_ns) { + err = -EPERM; + goto errout_free; + } + + rule->uid_range = nla_get_kuid_range(tb); + + if (!uid_range_set(&rule->uid_range) || + !uid_lte(rule->uid_range.start, rule->uid_range.end)) + goto errout_free; + } else { + rule->uid_range = fib_kuid_range_unset; + } + if ((nlh->nlmsg_flags & NLM_F_EXCL) && rule_exists(ops, frh, tb, rule)) { err = -EEXIST; @@ -497,6 +554,7 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh) struct fib_rules_ops *ops = NULL; struct fib_rule *rule, *tmp; struct nlattr *tb[FRA_MAX+1]; + struct fib_kuid_range range; int err = -EINVAL; if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh))) @@ -516,6 +574,14 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh) if (err < 0) goto errout; + if (tb[FRA_UID_RANGE]) { + range = nla_get_kuid_range(tb); + if (!uid_range_set(&range)) + goto errout; + } else { + range = fib_kuid_range_unset; + } + list_for_each_entry(rule, &ops->rules_list, list) { if (frh->action && (frh->action != rule->action)) continue; @@ -552,6 +618,11 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh) (rule->l3mdev != nla_get_u8(tb[FRA_L3MDEV]))) continue; + if (uid_range_set(&range) && + (!uid_eq(rule->uid_range.start, range.start) || + !uid_eq(rule->uid_range.end, range.end))) + continue; + if (!ops->compare(rule, frh, tb)) continue; @@ -619,7 +690,8 @@ static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops, + nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */ + nla_total_size(4) /* FRA_FWMARK */ + nla_total_size(4) /* FRA_FWMASK */ - + nla_total_size_64bit(8); /* FRA_TUN_ID */ + + nla_total_size_64bit(8) /* FRA_TUN_ID */ + + nla_total_size(sizeof(struct fib_kuid_range)); if (ops->nlmsg_payload) payload += ops->nlmsg_payload(rule); @@ -679,7 +751,9 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule, (rule->tun_id && nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) || (rule->l3mdev && - nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev))) + nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) || + (uid_range_set(&rule->uid_range) && + nla_put_uid_range(skb, &rule->uid_range))) goto nla_put_failure; if (rule->suppress_ifgroup != -1) { |