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-rw-r--r--include/net/netfilter/nf_conntrack_helper.h5
-rw-r--r--include/net/tc_act/tc_ct.h1
-rw-r--r--include/uapi/linux/tc_act/tc_ct.h3
-rw-r--r--net/netfilter/nf_conntrack_helper.c100
-rw-r--r--net/openvswitch/conntrack.c105
-rw-r--r--net/sched/act_ct.c124
6 files changed, 214 insertions, 124 deletions
diff --git a/include/net/netfilter/nf_conntrack_helper.h b/include/net/netfilter/nf_conntrack_helper.h
index 9939c366f720..f30b1694b690 100644
--- a/include/net/netfilter/nf_conntrack_helper.h
+++ b/include/net/netfilter/nf_conntrack_helper.h
@@ -115,6 +115,11 @@ struct nf_conn_help *nf_ct_helper_ext_add(struct nf_conn *ct, gfp_t gfp);
int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
gfp_t flags);
+int nf_ct_helper(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo, u16 proto);
+int nf_ct_add_helper(struct nf_conn *ct, const char *name, u8 family,
+ u8 proto, bool nat, struct nf_conntrack_helper **hp);
+
void nf_ct_helper_destroy(struct nf_conn *ct);
static inline struct nf_conn_help *nfct_help(const struct nf_conn *ct)
diff --git a/include/net/tc_act/tc_ct.h b/include/net/tc_act/tc_ct.h
index 8250d6f0a462..b24ea2d9400b 100644
--- a/include/net/tc_act/tc_ct.h
+++ b/include/net/tc_act/tc_ct.h
@@ -10,6 +10,7 @@
#include <net/netfilter/nf_conntrack_labels.h>
struct tcf_ct_params {
+ struct nf_conntrack_helper *helper;
struct nf_conn *tmpl;
u16 zone;
diff --git a/include/uapi/linux/tc_act/tc_ct.h b/include/uapi/linux/tc_act/tc_ct.h
index 5fb1d7ac1027..6c5200f0ed38 100644
--- a/include/uapi/linux/tc_act/tc_ct.h
+++ b/include/uapi/linux/tc_act/tc_ct.h
@@ -22,6 +22,9 @@ enum {
TCA_CT_NAT_PORT_MIN, /* be16 */
TCA_CT_NAT_PORT_MAX, /* be16 */
TCA_CT_PAD,
+ TCA_CT_HELPER_NAME, /* string */
+ TCA_CT_HELPER_FAMILY, /* u8 */
+ TCA_CT_HELPER_PROTO, /* u8 */
__TCA_CT_MAX
};
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index ff737a76052e..48ea6d0264b5 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -26,7 +26,9 @@
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
+#include <net/netfilter/nf_conntrack_seqadj.h>
#include <net/netfilter/nf_log.h>
+#include <net/ip.h>
static DEFINE_MUTEX(nf_ct_helper_mutex);
struct hlist_head *nf_ct_helper_hash __read_mostly;
@@ -240,6 +242,104 @@ int __nf_ct_try_assign_helper(struct nf_conn *ct, struct nf_conn *tmpl,
}
EXPORT_SYMBOL_GPL(__nf_ct_try_assign_helper);
+/* 'skb' should already be pulled to nh_ofs. */
+int nf_ct_helper(struct sk_buff *skb, struct nf_conn *ct,
+ enum ip_conntrack_info ctinfo, u16 proto)
+{
+ const struct nf_conntrack_helper *helper;
+ const struct nf_conn_help *help;
+ unsigned int protoff;
+ int err;
+
+ if (ctinfo == IP_CT_RELATED_REPLY)
+ return NF_ACCEPT;
+
+ help = nfct_help(ct);
+ if (!help)
+ return NF_ACCEPT;
+
+ helper = rcu_dereference(help->helper);
+ if (!helper)
+ return NF_ACCEPT;
+
+ if (helper->tuple.src.l3num != NFPROTO_UNSPEC &&
+ helper->tuple.src.l3num != proto)
+ return NF_ACCEPT;
+
+ switch (proto) {
+ case NFPROTO_IPV4:
+ protoff = ip_hdrlen(skb);
+ proto = ip_hdr(skb)->protocol;
+ break;
+ case NFPROTO_IPV6: {
+ u8 nexthdr = ipv6_hdr(skb)->nexthdr;
+ __be16 frag_off;
+ int ofs;
+
+ ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
+ &frag_off);
+ if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
+ pr_debug("proto header not found\n");
+ return NF_ACCEPT;
+ }
+ protoff = ofs;
+ proto = nexthdr;
+ break;
+ }
+ default:
+ WARN_ONCE(1, "helper invoked on non-IP family!");
+ return NF_DROP;
+ }
+
+ if (helper->tuple.dst.protonum != proto)
+ return NF_ACCEPT;
+
+ err = helper->help(skb, protoff, ct, ctinfo);
+ if (err != NF_ACCEPT)
+ return err;
+
+ /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
+ * FTP with NAT) adusting the TCP payload size when mangling IP
+ * addresses and/or port numbers in the text-based control connection.
+ */
+ if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
+ !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
+ return NF_DROP;
+ return NF_ACCEPT;
+}
+EXPORT_SYMBOL_GPL(nf_ct_helper);
+
+int nf_ct_add_helper(struct nf_conn *ct, const char *name, u8 family,
+ u8 proto, bool nat, struct nf_conntrack_helper **hp)
+{
+ struct nf_conntrack_helper *helper;
+ struct nf_conn_help *help;
+ int ret = 0;
+
+ helper = nf_conntrack_helper_try_module_get(name, family, proto);
+ if (!helper)
+ return -EINVAL;
+
+ help = nf_ct_helper_ext_add(ct, GFP_KERNEL);
+ if (!help) {
+ nf_conntrack_helper_put(helper);
+ return -ENOMEM;
+ }
+#if IS_ENABLED(CONFIG_NF_NAT)
+ if (nat) {
+ ret = nf_nat_helper_try_module_get(name, family, proto);
+ if (ret) {
+ nf_conntrack_helper_put(helper);
+ return ret;
+ }
+ }
+#endif
+ rcu_assign_pointer(help->helper, helper);
+ *hp = helper;
+ return ret;
+}
+EXPORT_SYMBOL_GPL(nf_ct_add_helper);
+
/* appropriate ct lock protecting must be taken by caller */
static int unhelp(struct nf_conn *ct, void *me)
{
diff --git a/net/openvswitch/conntrack.c b/net/openvswitch/conntrack.c
index c7b10234cf7c..4348321856af 100644
--- a/net/openvswitch/conntrack.c
+++ b/net/openvswitch/conntrack.c
@@ -434,65 +434,6 @@ static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
return 0;
}
-/* 'skb' should already be pulled to nh_ofs. */
-static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
-{
- const struct nf_conntrack_helper *helper;
- const struct nf_conn_help *help;
- enum ip_conntrack_info ctinfo;
- unsigned int protoff;
- struct nf_conn *ct;
- int err;
-
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct || ctinfo == IP_CT_RELATED_REPLY)
- return NF_ACCEPT;
-
- help = nfct_help(ct);
- if (!help)
- return NF_ACCEPT;
-
- helper = rcu_dereference(help->helper);
- if (!helper)
- return NF_ACCEPT;
-
- switch (proto) {
- case NFPROTO_IPV4:
- protoff = ip_hdrlen(skb);
- break;
- case NFPROTO_IPV6: {
- u8 nexthdr = ipv6_hdr(skb)->nexthdr;
- __be16 frag_off;
- int ofs;
-
- ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
- &frag_off);
- if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
- pr_debug("proto header not found\n");
- return NF_ACCEPT;
- }
- protoff = ofs;
- break;
- }
- default:
- WARN_ONCE(1, "helper invoked on non-IP family!");
- return NF_DROP;
- }
-
- err = helper->help(skb, protoff, ct, ctinfo);
- if (err != NF_ACCEPT)
- return err;
-
- /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
- * FTP with NAT) adusting the TCP payload size when mangling IP
- * addresses and/or port numbers in the text-based control connection.
- */
- if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
- !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
- return NF_DROP;
- return NF_ACCEPT;
-}
-
/* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
* value if 'skb' is freed.
*/
@@ -1038,7 +979,7 @@ static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
*/
if ((nf_ct_is_confirmed(ct) ? !cached || add_helper :
info->commit) &&
- ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
+ nf_ct_helper(skb, ct, ctinfo, info->family) != NF_ACCEPT) {
return -EINVAL;
}
@@ -1350,43 +1291,6 @@ int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
return 0;
}
-static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
- const struct sw_flow_key *key, bool log)
-{
- struct nf_conntrack_helper *helper;
- struct nf_conn_help *help;
- int ret = 0;
-
- helper = nf_conntrack_helper_try_module_get(name, info->family,
- key->ip.proto);
- if (!helper) {
- OVS_NLERR(log, "Unknown helper \"%s\"", name);
- return -EINVAL;
- }
-
- help = nf_ct_helper_ext_add(info->ct, GFP_KERNEL);
- if (!help) {
- nf_conntrack_helper_put(helper);
- return -ENOMEM;
- }
-
-#if IS_ENABLED(CONFIG_NF_NAT)
- if (info->nat) {
- ret = nf_nat_helper_try_module_get(name, info->family,
- key->ip.proto);
- if (ret) {
- nf_conntrack_helper_put(helper);
- OVS_NLERR(log, "Failed to load \"%s\" NAT helper, error: %d",
- name, ret);
- return ret;
- }
- }
-#endif
- rcu_assign_pointer(help->helper, helper);
- info->helper = helper;
- return ret;
-}
-
#if IS_ENABLED(CONFIG_NF_NAT)
static int parse_nat(const struct nlattr *attr,
struct ovs_conntrack_info *info, bool log)
@@ -1720,9 +1624,12 @@ int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
}
if (helper) {
- err = ovs_ct_add_helper(&ct_info, helper, key, log);
- if (err)
+ err = nf_ct_add_helper(ct_info.ct, helper, ct_info.family,
+ key->ip.proto, ct_info.nat, &ct_info.helper);
+ if (err) {
+ OVS_NLERR(log, "Failed to add %s helper %d", helper, err);
goto err_free_ct;
+ }
}
err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
diff --git a/net/sched/act_ct.c b/net/sched/act_ct.c
index b38d91d6b249..da0b7f665277 100644
--- a/net/sched/act_ct.c
+++ b/net/sched/act_ct.c
@@ -33,6 +33,7 @@
#include <net/netfilter/nf_conntrack_acct.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#include <net/netfilter/nf_conntrack_act_ct.h>
+#include <net/netfilter/nf_conntrack_seqadj.h>
#include <uapi/linux/netfilter/nf_nat.h>
static struct workqueue_struct *act_ct_wq;
@@ -345,11 +346,9 @@ static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
module_put(THIS_MODULE);
}
-static void tcf_ct_flow_table_put(struct tcf_ct_params *params)
+static void tcf_ct_flow_table_put(struct tcf_ct_flow_table *ct_ft)
{
- struct tcf_ct_flow_table *ct_ft = params->ct_ft;
-
- if (refcount_dec_and_test(&params->ct_ft->ref)) {
+ if (refcount_dec_and_test(&ct_ft->ref)) {
rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
queue_rcu_work(act_ct_wq, &ct_ft->rwork);
@@ -657,7 +656,7 @@ struct tc_ct_action_net {
/* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
- u16 zone_id, bool force)
+ struct tcf_ct_params *p)
{
enum ip_conntrack_info ctinfo;
struct nf_conn *ct;
@@ -667,11 +666,19 @@ static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
return false;
if (!net_eq(net, read_pnet(&ct->ct_net)))
goto drop_ct;
- if (nf_ct_zone(ct)->id != zone_id)
+ if (nf_ct_zone(ct)->id != p->zone)
goto drop_ct;
+ if (p->helper) {
+ struct nf_conn_help *help;
+
+ help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
+ if (help && rcu_access_pointer(help->helper) != p->helper)
+ goto drop_ct;
+ }
/* Force conntrack entry direction. */
- if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
+ if ((p->ct_action & TCA_CT_ACT_FORCE) &&
+ CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
if (nf_ct_is_confirmed(ct))
nf_ct_kill(ct);
@@ -832,18 +839,30 @@ out_free:
return err;
}
-static void tcf_ct_params_free(struct rcu_head *head)
+static void tcf_ct_params_free(struct tcf_ct_params *params)
{
- struct tcf_ct_params *params = container_of(head,
- struct tcf_ct_params, rcu);
-
- tcf_ct_flow_table_put(params);
-
+ if (params->helper) {
+#if IS_ENABLED(CONFIG_NF_NAT)
+ if (params->ct_action & TCA_CT_ACT_NAT)
+ nf_nat_helper_put(params->helper);
+#endif
+ nf_conntrack_helper_put(params->helper);
+ }
+ if (params->ct_ft)
+ tcf_ct_flow_table_put(params->ct_ft);
if (params->tmpl)
nf_ct_put(params->tmpl);
kfree(params);
}
+static void tcf_ct_params_free_rcu(struct rcu_head *head)
+{
+ struct tcf_ct_params *params;
+
+ params = container_of(head, struct tcf_ct_params, rcu);
+ tcf_ct_params_free(params);
+}
+
#if IS_ENABLED(CONFIG_NF_NAT)
/* Modelled after nf_nat_ipv[46]_fn().
* range is only used for new, uninitialized NAT state.
@@ -1023,13 +1042,14 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
struct net *net = dev_net(skb->dev);
- bool cached, commit, clear, force;
enum ip_conntrack_info ctinfo;
struct tcf_ct *c = to_ct(a);
struct nf_conn *tmpl = NULL;
struct nf_hook_state state;
+ bool cached, commit, clear;
int nh_ofs, err, retval;
struct tcf_ct_params *p;
+ bool add_helper = false;
bool skip_add = false;
bool defrag = false;
struct nf_conn *ct;
@@ -1040,7 +1060,6 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
retval = READ_ONCE(c->tcf_action);
commit = p->ct_action & TCA_CT_ACT_COMMIT;
clear = p->ct_action & TCA_CT_ACT_CLEAR;
- force = p->ct_action & TCA_CT_ACT_FORCE;
tmpl = p->tmpl;
tcf_lastuse_update(&c->tcf_tm);
@@ -1083,7 +1102,7 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
* actually run the packet through conntrack twice unless it's for a
* different zone.
*/
- cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
+ cached = tcf_ct_skb_nfct_cached(net, skb, p);
if (!cached) {
if (tcf_ct_flow_table_lookup(p, skb, family)) {
skip_add = true;
@@ -1116,6 +1135,22 @@ do_nat:
if (err != NF_ACCEPT)
goto drop;
+ if (!nf_ct_is_confirmed(ct) && commit && p->helper && !nfct_help(ct)) {
+ err = __nf_ct_try_assign_helper(ct, p->tmpl, GFP_ATOMIC);
+ if (err)
+ goto drop;
+ add_helper = true;
+ if (p->ct_action & TCA_CT_ACT_NAT && !nfct_seqadj(ct)) {
+ if (!nfct_seqadj_ext_add(ct))
+ goto drop;
+ }
+ }
+
+ if (nf_ct_is_confirmed(ct) ? ((!cached && !skip_add) || add_helper) : commit) {
+ if (nf_ct_helper(skb, ct, ctinfo, family) != NF_ACCEPT)
+ goto drop;
+ }
+
if (commit) {
tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
@@ -1164,6 +1199,9 @@ static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
[TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
[TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
[TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
+ [TCA_CT_HELPER_NAME] = { .type = NLA_STRING, .len = NF_CT_HELPER_NAME_LEN },
+ [TCA_CT_HELPER_FAMILY] = { .type = NLA_U8 },
+ [TCA_CT_HELPER_PROTO] = { .type = NLA_U8 },
};
static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
@@ -1253,8 +1291,9 @@ static int tcf_ct_fill_params(struct net *net,
{
struct tc_ct_action_net *tn = net_generic(net, act_ct_ops.net_id);
struct nf_conntrack_zone zone;
+ int err, family, proto, len;
struct nf_conn *tmpl;
- int err;
+ char *name;
p->zone = NF_CT_DEFAULT_ZONE_ID;
@@ -1315,10 +1354,31 @@ static int tcf_ct_fill_params(struct net *net,
NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
return -ENOMEM;
}
- __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
p->tmpl = tmpl;
+ if (tb[TCA_CT_HELPER_NAME]) {
+ name = nla_data(tb[TCA_CT_HELPER_NAME]);
+ len = nla_len(tb[TCA_CT_HELPER_NAME]);
+ if (len > 16 || name[len - 1] != '\0') {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to parse helper name.");
+ err = -EINVAL;
+ goto err;
+ }
+ family = tb[TCA_CT_HELPER_FAMILY] ? nla_get_u8(tb[TCA_CT_HELPER_FAMILY]) : AF_INET;
+ proto = tb[TCA_CT_HELPER_PROTO] ? nla_get_u8(tb[TCA_CT_HELPER_PROTO]) : IPPROTO_TCP;
+ err = nf_ct_add_helper(tmpl, name, family, proto,
+ p->ct_action & TCA_CT_ACT_NAT, &p->helper);
+ if (err) {
+ NL_SET_ERR_MSG_MOD(extack, "Failed to add helper");
+ goto err;
+ }
+ }
+ __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
return 0;
+err:
+ nf_ct_put(p->tmpl);
+ p->tmpl = NULL;
+ return err;
}
static int tcf_ct_init(struct net *net, struct nlattr *nla,
@@ -1390,7 +1450,7 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,
err = tcf_ct_flow_table_get(net, params);
if (err)
- goto cleanup_params;
+ goto cleanup;
spin_lock_bh(&c->tcf_lock);
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
@@ -1401,17 +1461,15 @@ static int tcf_ct_init(struct net *net, struct nlattr *nla,
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
if (params)
- call_rcu(&params->rcu, tcf_ct_params_free);
+ call_rcu(&params->rcu, tcf_ct_params_free_rcu);
return res;
-cleanup_params:
- if (params->tmpl)
- nf_ct_put(params->tmpl);
cleanup:
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
- kfree(params);
+ if (params)
+ tcf_ct_params_free(params);
tcf_idr_release(*a, bind);
return err;
}
@@ -1423,7 +1481,7 @@ static void tcf_ct_cleanup(struct tc_action *a)
params = rcu_dereference_protected(c->params, 1);
if (params)
- call_rcu(&params->rcu, tcf_ct_params_free);
+ call_rcu(&params->rcu, tcf_ct_params_free_rcu);
}
static int tcf_ct_dump_key_val(struct sk_buff *skb,
@@ -1489,6 +1547,19 @@ static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
return 0;
}
+static int tcf_ct_dump_helper(struct sk_buff *skb, struct nf_conntrack_helper *helper)
+{
+ if (!helper)
+ return 0;
+
+ if (nla_put_string(skb, TCA_CT_HELPER_NAME, helper->name) ||
+ nla_put_u8(skb, TCA_CT_HELPER_FAMILY, helper->tuple.src.l3num) ||
+ nla_put_u8(skb, TCA_CT_HELPER_PROTO, helper->tuple.dst.protonum))
+ return -1;
+
+ return 0;
+}
+
static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
@@ -1541,6 +1612,9 @@ static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
if (tcf_ct_dump_nat(skb, p))
goto nla_put_failure;
+ if (tcf_ct_dump_helper(skb, p->helper))
+ goto nla_put_failure;
+
skip_dump:
if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
generated by cgit v1.2.3 (git 2.39.0) at 2024-08-28 11:04:54 +0300