[Devel] [PATCH rh7 04/19] ms/netfilter: conntrack: check netns when comparing conntrack objects
Konstantin Khorenko
khorenko at virtuozzo.com
Fri May 22 11:10:41 MSK 2020
From: Florian Westphal <fw at strlen.de>
Once we place all conntracks in the same hash table we must also compare
the netns pointer to skip conntracks that belong to a different namespace.
Signed-off-by: Florian Westphal <fw at strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo at netfilter.org>
https://jira.sw.ru/browse/PSBM-103515
(cherry picked from commit e0c7d47221883966d930fa7335b3ca295bc316b2)
Signed-off-by: Konstantin Khorenko <khorenko at virtuozzo.com>
---
.../netfilter/nf_conntrack_l3proto_ipv4_compat.c | 8 ++++++--
net/netfilter/nf_conntrack_core.c | 23 ++++++++++++----------
net/netfilter/nf_conntrack_netlink.c | 3 +++
3 files changed, 22 insertions(+), 12 deletions(-)
diff --git a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
index 7ac69de208868..2082e52cb5d9e 100644
--- a/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
+++ b/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4_compat.c
@@ -117,6 +117,7 @@ static inline int ct_show_secctx(struct seq_file *s, const struct nf_conn *ct)
#endif
static bool ct_seq_should_skip(const struct nf_conn *ct,
+ const struct net *net,
const struct nf_conntrack_tuple_hash *hash)
{
/* we only want to print DIR_ORIGINAL */
@@ -126,6 +127,9 @@ static bool ct_seq_should_skip(const struct nf_conn *ct,
if (nf_ct_l3num(ct) != AF_INET)
return true;
+ if (!net_eq(nf_ct_net(ct), net))
+ return true;
+
return false;
}
@@ -138,7 +142,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
int ret = 0;
NF_CT_ASSERT(ct);
- if (ct_seq_should_skip(ct, hash))
+ if (ct_seq_should_skip(ct, seq_file_net(s), hash))
return 0;
if (unlikely(!atomic_inc_not_zero(&ct->ct_general.use)))
@@ -146,7 +150,7 @@ static int ct_seq_show(struct seq_file *s, void *v)
/* check if we raced w. object reuse */
if (!nf_ct_is_confirmed(ct) ||
- ct_seq_should_skip(ct, hash))
+ ct_seq_should_skip(ct, seq_file_net(s), hash))
goto release;
l3proto = __nf_ct_l3proto_find(nf_ct_l3num(ct));
diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
index c42074f98d155..67037c1fa3bac 100644
--- a/net/netfilter/nf_conntrack_core.c
+++ b/net/netfilter/nf_conntrack_core.c
@@ -463,7 +463,8 @@ static void death_by_timeout(unsigned long ul_conntrack)
static inline bool
nf_ct_key_equal(struct nf_conntrack_tuple_hash *h,
const struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_zone *zone)
+ const struct nf_conntrack_zone *zone,
+ const struct net *net)
{
struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
@@ -472,7 +473,8 @@ nf_ct_key_equal(struct nf_conntrack_tuple_hash *h,
*/
return nf_ct_tuple_equal(tuple, &h->tuple) &&
nf_ct_zone_equal(ct, zone, NF_CT_DIRECTION(h)) &&
- nf_ct_is_confirmed(ct);
+ nf_ct_is_confirmed(ct) &&
+ net_eq(net, nf_ct_net(ct));
}
static inline bool
@@ -529,7 +531,7 @@ ____nf_conntrack_find(struct net *net, const struct nf_conntrack_zone *zone,
} while (read_seqcount_retry(&nf_conntrack_generation, sequence));
hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[bucket], hnnode) {
- if (nf_ct_key_equal(h, tuple, zone)) {
+ if (nf_ct_key_equal(h, tuple, zone, net)) {
NF_CT_STAT_INC(net, found);
local_bh_enable();
return h;
@@ -567,7 +569,7 @@ __nf_conntrack_find_get(struct net *net, const struct nf_conntrack_zone *zone,
!atomic_inc_not_zero(&ct->ct_general.use)))
h = NULL;
else {
- if (unlikely(!nf_ct_key_equal(h, tuple, zone))) {
+ if (unlikely(!nf_ct_key_equal(h, tuple, zone, net))) {
nf_ct_put(ct);
goto begin;
}
@@ -623,12 +625,12 @@ nf_conntrack_hash_check_insert(struct nf_conn *ct)
/* See if there's one in the list already, including reverse */
hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- zone))
+ zone, net))
goto out;
hlist_nulls_for_each_entry(h, n, &net->ct.hash[reply_hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
- zone))
+ zone, net))
goto out;
add_timer(&ct->timeout);
@@ -772,12 +774,12 @@ __nf_conntrack_confirm(struct sk_buff *skb)
not in the hash. If there is, we lost race. */
hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- zone))
+ zone, net))
goto out;
hlist_nulls_for_each_entry(h, n, &net->ct.hash[reply_hash], hnnode)
if (nf_ct_key_equal(h, &ct->tuplehash[IP_CT_DIR_REPLY].tuple,
- zone))
+ zone, net))
goto out;
/* Timer relative to confirmation time, not original
@@ -854,7 +856,7 @@ nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple,
hlist_nulls_for_each_entry_rcu(h, n, &ct_hash[hash], hnnode) {
ct = nf_ct_tuplehash_to_ctrack(h);
if (ct != ignored_conntrack &&
- nf_ct_key_equal(h, tuple, zone)) {
+ nf_ct_key_equal(h, tuple, zone, net)) {
/* Tuple is taken already, so caller will need to find
* a new source port to use.
*
@@ -1530,7 +1532,8 @@ get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data),
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
- if (iter(ct, data))
+ if (net_eq(nf_ct_net(ct), net) &&
+ iter(ct, data))
goto found;
}
}
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index fd52f90c17373..62fb00ac575fc 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -827,6 +827,9 @@ ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
continue;
ct = nf_ct_tuplehash_to_ctrack(h);
+ if (!net_eq(net, nf_ct_net(ct)))
+ continue;
+
/* Dump entries of a given L3 protocol number.
* If it is not specified, ie. l3proto == 0,
* then dump everything. */
--
2.15.1
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