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net: sched: add helper support in act_ct

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This patch is to add helper support in act_ct for OVS actions=ct(alg=xxx)
offloading, which is corresponding to Commit cae3a26275 ("openvswitch:
Allow attaching helpers to ct action") in OVS kernel part.

The difference is when adding TC actions family and proto cannot be got
from the filter/match, other than helper name in tb[TCA_CT_HELPER_NAME],
we also need to send the family in tb[TCA_CT_HELPER_FAMILY] and the
proto in tb[TCA_CT_HELPER_PROTO] to kernel.

Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Xin Long 2022-11-06 15:34:17 -05:00 committed by Paolo Abeni
parent 1913894100
commit a21b06e731
3 changed files with 85 additions and 8 deletions
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1
include/net/tc_act/tc_ct.h
View File

@ -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;

3
include/uapi/linux/tc_act/tc_ct.h
View File

@ -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
};

89
net/sched/act_ct.c
View File

@ -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;
@ -655,7 +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;
@ -665,11 +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);
@ -832,6 +841,13 @@ static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
static void tcf_ct_params_free(struct tcf_ct_params *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)
@ -1026,13 +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;
@ -1043,7 +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);
@ -1086,7 +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;
@ -1119,6 +1135,22 @@ static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
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);
@ -1167,6 +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,
@ -1256,8 +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;
@ -1318,10 +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,
@ -1490,6 +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)
{
@ -1542,6 +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;