net: core: add UID to flows, rules, and routes
- Define a new FIB rule attributes, FRA_UID_RANGE, to describe a range of UIDs. - Define a RTA_UID attribute for per-UID route lookups and dumps. - Support passing these attributes to and from userspace via rtnetlink. The value INVALID_UID indicates no UID was specified. - Add a UID field to the flow structures. Signed-off-by: Lorenzo Colitti <lorenzo@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Lorenzo Colitti
David S. Miller
Родитель
86741ec254
Коммит
622ec2c9d5
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@ -8,6 +8,11 @@
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#include <net/flow.h>
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#include <net/rtnetlink.h>
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struct fib_kuid_range {
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kuid_t start;
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kuid_t end;
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};
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struct fib_rule {
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struct list_head list;
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int iifindex;
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@ -30,6 +35,7 @@ struct fib_rule {
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int suppress_prefixlen;
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char iifname[IFNAMSIZ];
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char oifname[IFNAMSIZ];
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struct fib_kuid_range uid_range;
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struct rcu_head rcu;
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};
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@ -92,7 +98,8 @@ struct fib_rules_ops {
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[FRA_SUPPRESS_PREFIXLEN] = { .type = NLA_U32 }, \
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[FRA_SUPPRESS_IFGROUP] = { .type = NLA_U32 }, \
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[FRA_GOTO] = { .type = NLA_U32 }, \
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[FRA_L3MDEV] = { .type = NLA_U8 }
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[FRA_L3MDEV] = { .type = NLA_U8 }, \
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[FRA_UID_RANGE] = { .len = sizeof(struct fib_rule_uid_range) }
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static inline void fib_rule_get(struct fib_rule *rule)
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{
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@ -11,6 +11,7 @@
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#include <linux/in6.h>
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#include <linux/atomic.h>
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#include <net/flow_dissector.h>
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#include <linux/uidgid.h>
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/*
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* ifindex generation is per-net namespace, and loopback is
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@ -37,6 +38,7 @@ struct flowi_common {
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#define FLOWI_FLAG_SKIP_NH_OIF 0x04
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__u32 flowic_secid;
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struct flowi_tunnel flowic_tun_key;
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kuid_t flowic_uid;
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};
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union flowi_uli {
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@ -74,6 +76,7 @@ struct flowi4 {
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#define flowi4_flags __fl_common.flowic_flags
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#define flowi4_secid __fl_common.flowic_secid
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#define flowi4_tun_key __fl_common.flowic_tun_key
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#define flowi4_uid __fl_common.flowic_uid
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/* (saddr,daddr) must be grouped, same order as in IP header */
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__be32 saddr;
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@ -131,6 +134,7 @@ struct flowi6 {
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#define flowi6_flags __fl_common.flowic_flags
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#define flowi6_secid __fl_common.flowic_secid
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#define flowi6_tun_key __fl_common.flowic_tun_key
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#define flowi6_uid __fl_common.flowic_uid
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struct in6_addr daddr;
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struct in6_addr saddr;
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/* Note: flowi6_tos is encoded in flowlabel, too. */
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@ -176,6 +180,7 @@ struct flowi {
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#define flowi_flags u.__fl_common.flowic_flags
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#define flowi_secid u.__fl_common.flowic_secid
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#define flowi_tun_key u.__fl_common.flowic_tun_key
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#define flowi_uid u.__fl_common.flowic_uid
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} __attribute__((__aligned__(BITS_PER_LONG/8)));
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static inline struct flowi *flowi4_to_flowi(struct flowi4 *fl4)
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@ -29,6 +29,11 @@ struct fib_rule_hdr {
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__u32 flags;
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};
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struct fib_rule_uid_range {
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__u32 start;
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__u32 end;
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};
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enum {
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FRA_UNSPEC,
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FRA_DST, /* destination address */
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@ -51,6 +56,7 @@ enum {
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FRA_OIFNAME,
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FRA_PAD,
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FRA_L3MDEV, /* iif or oif is l3mdev goto its table */
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FRA_UID_RANGE, /* UID range */
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__FRA_MAX
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};
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@ -318,6 +318,7 @@ enum rtattr_type_t {
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RTA_ENCAP,
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RTA_EXPIRES,
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RTA_PAD,
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RTA_UID,
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__RTA_MAX
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};
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@ -18,6 +18,11 @@
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#include <net/fib_rules.h>
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#include <net/ip_tunnels.h>
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static const struct fib_kuid_range fib_kuid_range_unset = {
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KUIDT_INIT(0),
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KUIDT_INIT(~0),
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};
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int fib_default_rule_add(struct fib_rules_ops *ops,
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u32 pref, u32 table, u32 flags)
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{
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@ -33,6 +38,7 @@ int fib_default_rule_add(struct fib_rules_ops *ops,
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r->table = table;
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r->flags = flags;
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r->fr_net = ops->fro_net;
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r->uid_range = fib_kuid_range_unset;
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r->suppress_prefixlen = -1;
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r->suppress_ifgroup = -1;
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@ -172,6 +178,34 @@ void fib_rules_unregister(struct fib_rules_ops *ops)
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}
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EXPORT_SYMBOL_GPL(fib_rules_unregister);
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static int uid_range_set(struct fib_kuid_range *range)
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{
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return uid_valid(range->start) && uid_valid(range->end);
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}
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static struct fib_kuid_range nla_get_kuid_range(struct nlattr **tb)
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{
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struct fib_rule_uid_range *in;
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struct fib_kuid_range out;
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in = (struct fib_rule_uid_range *)nla_data(tb[FRA_UID_RANGE]);
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out.start = make_kuid(current_user_ns(), in->start);
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out.end = make_kuid(current_user_ns(), in->end);
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return out;
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}
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static int nla_put_uid_range(struct sk_buff *skb, struct fib_kuid_range *range)
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{
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struct fib_rule_uid_range out = {
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from_kuid_munged(current_user_ns(), range->start),
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from_kuid_munged(current_user_ns(), range->end)
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};
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return nla_put(skb, FRA_UID_RANGE, sizeof(out), &out);
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}
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static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
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struct flowi *fl, int flags,
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struct fib_lookup_arg *arg)
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@ -193,6 +227,10 @@ static int fib_rule_match(struct fib_rule *rule, struct fib_rules_ops *ops,
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if (rule->l3mdev && !l3mdev_fib_rule_match(rule->fr_net, fl, arg))
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goto out;
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if (uid_lt(fl->flowi_uid, rule->uid_range.start) ||
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uid_gt(fl->flowi_uid, rule->uid_range.end))
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goto out;
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ret = ops->match(rule, fl, flags);
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out:
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return (rule->flags & FIB_RULE_INVERT) ? !ret : ret;
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@ -429,6 +467,21 @@ int fib_nl_newrule(struct sk_buff *skb, struct nlmsghdr *nlh)
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if (rule->l3mdev && rule->table)
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goto errout_free;
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if (tb[FRA_UID_RANGE]) {
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if (current_user_ns() != net->user_ns) {
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err = -EPERM;
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goto errout_free;
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}
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rule->uid_range = nla_get_kuid_range(tb);
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if (!uid_range_set(&rule->uid_range) ||
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!uid_lte(rule->uid_range.start, rule->uid_range.end))
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goto errout_free;
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} else {
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rule->uid_range = fib_kuid_range_unset;
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}
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if ((nlh->nlmsg_flags & NLM_F_EXCL) &&
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rule_exists(ops, frh, tb, rule)) {
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err = -EEXIST;
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@ -497,6 +550,7 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh)
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struct fib_rules_ops *ops = NULL;
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struct fib_rule *rule, *tmp;
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struct nlattr *tb[FRA_MAX+1];
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struct fib_kuid_range range;
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int err = -EINVAL;
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if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*frh)))
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@ -516,6 +570,14 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh)
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if (err < 0)
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goto errout;
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if (tb[FRA_UID_RANGE]) {
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range = nla_get_kuid_range(tb);
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if (!uid_range_set(&range))
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goto errout;
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} else {
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range = fib_kuid_range_unset;
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}
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list_for_each_entry(rule, &ops->rules_list, list) {
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if (frh->action && (frh->action != rule->action))
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continue;
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@ -552,6 +614,11 @@ int fib_nl_delrule(struct sk_buff *skb, struct nlmsghdr *nlh)
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(rule->l3mdev != nla_get_u8(tb[FRA_L3MDEV])))
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continue;
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if (uid_range_set(&range) &&
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(!uid_eq(rule->uid_range.start, range.start) ||
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!uid_eq(rule->uid_range.end, range.end)))
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continue;
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if (!ops->compare(rule, frh, tb))
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continue;
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@ -619,7 +686,8 @@ static inline size_t fib_rule_nlmsg_size(struct fib_rules_ops *ops,
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+ nla_total_size(4) /* FRA_SUPPRESS_IFGROUP */
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+ nla_total_size(4) /* FRA_FWMARK */
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+ nla_total_size(4) /* FRA_FWMASK */
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+ nla_total_size_64bit(8); /* FRA_TUN_ID */
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+ nla_total_size_64bit(8) /* FRA_TUN_ID */
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+ nla_total_size(sizeof(struct fib_kuid_range));
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if (ops->nlmsg_payload)
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payload += ops->nlmsg_payload(rule);
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@ -679,7 +747,9 @@ static int fib_nl_fill_rule(struct sk_buff *skb, struct fib_rule *rule,
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(rule->tun_id &&
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nla_put_be64(skb, FRA_TUN_ID, rule->tun_id, FRA_PAD)) ||
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(rule->l3mdev &&
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nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)))
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nla_put_u8(skb, FRA_L3MDEV, rule->l3mdev)) ||
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(uid_range_set(&rule->uid_range) &&
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nla_put_uid_range(skb, &rule->uid_range)))
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goto nla_put_failure;
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if (rule->suppress_ifgroup != -1) {
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@ -610,6 +610,7 @@ const struct nla_policy rtm_ipv4_policy[RTA_MAX + 1] = {
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[RTA_FLOW] = { .type = NLA_U32 },
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[RTA_ENCAP_TYPE] = { .type = NLA_U16 },
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[RTA_ENCAP] = { .type = NLA_NESTED },
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[RTA_UID] = { .type = NLA_U32 },
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};
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static int rtm_to_fib_config(struct net *net, struct sk_buff *skb,
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@ -2504,6 +2504,11 @@ static int rt_fill_info(struct net *net, __be32 dst, __be32 src, u32 table_id,
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nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark))
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goto nla_put_failure;
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if (!uid_eq(fl4->flowi4_uid, INVALID_UID) &&
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nla_put_u32(skb, RTA_UID,
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from_kuid_munged(current_user_ns(), fl4->flowi4_uid)))
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goto nla_put_failure;
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error = rt->dst.error;
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if (rt_is_input_route(rt)) {
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@ -2556,6 +2561,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
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int mark;
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struct sk_buff *skb;
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u32 table_id = RT_TABLE_MAIN;
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kuid_t uid;
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err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv4_policy);
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if (err < 0)
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@ -2583,6 +2589,10 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
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dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0;
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iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0;
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mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0;
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if (tb[RTA_UID])
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uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID]));
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else
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uid = (iif ? INVALID_UID : current_uid());
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memset(&fl4, 0, sizeof(fl4));
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fl4.daddr = dst;
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@ -2590,6 +2600,7 @@ static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
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fl4.flowi4_tos = rtm->rtm_tos;
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fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0;
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fl4.flowi4_mark = mark;
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fl4.flowi4_uid = uid;
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if (iif) {
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struct net_device *dev;
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@ -2797,6 +2797,7 @@ static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
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[RTA_ENCAP_TYPE] = { .type = NLA_U16 },
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[RTA_ENCAP] = { .type = NLA_NESTED },
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[RTA_EXPIRES] = { .type = NLA_U32 },
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[RTA_UID] = { .type = NLA_U32 },
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};
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static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
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@ -3371,6 +3372,12 @@ static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
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if (tb[RTA_MARK])
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fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
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if (tb[RTA_UID])
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fl6.flowi6_uid = make_kuid(current_user_ns(),
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nla_get_u32(tb[RTA_UID]));
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else
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fl6.flowi6_uid = iif ? INVALID_UID : current_uid();
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if (iif) {
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struct net_device *dev;
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int flags = 0;
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