[PATCH net-next,v2 04/12] cls_api: add translator to flow_action representation

Pablo Neira Ayuso
2018-11-19T10:38:50Z

This patch implements a new function to translate from native TC action
to the new flow_action representation. Moreover, this patch also updates
cls_flower to use this new function.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
v2: no changes.

include/net/pkt_cls.h | 3 ++
net/sched/cls_api.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++
net/sched/cls_flower.c | 15 ++++++-
3 files changed, 130 insertions(+), 1 deletion(-)

diff --git a/include/net/pkt_cls.h b/include/net/pkt_cls.h
index 8b79a1a3a5c7..7d7aefa5fcd2 100644
--- a/include/net/pkt_cls.h
+++ b/include/net/pkt_cls.h
@@ -619,6 +619,9 @@ tcf_match_indev(struct sk_buff *skb, int ifindex)
}
#endif /* CONFIG_NET_CLS_IND */

+int tc_setup_flow_action(struct flow_action *flow_action,
+ const struct tcf_exts *exts);
+
int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
enum tc_setup_type type, void *type_data, bool err_stop);

diff --git a/net/sched/cls_api.c b/net/sched/cls_api.c
index d92f44ac4c39..6ab44e650f43 100644
--- a/net/sched/cls_api.c
+++ b/net/sched/cls_api.c
@@ -31,6 +31,14 @@
#include <net/netlink.h>
#include <net/pkt_sched.h>
#include <net/pkt_cls.h>
+#include <net/tc_act/tc_mirred.h>
+#include <net/tc_act/tc_vlan.h>
+#include <net/tc_act/tc_tunnel_key.h>
+#include <net/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_csum.h>
+#include <net/tc_act/tc_gact.h>
+#include <net/tc_act/tc_skbedit.h>
+#include <net/tc_act/tc_mirred.h>

extern const struct nla_policy rtm_tca_policy[TCA_MAX + 1];

@@ -2567,6 +2575,111 @@ int tc_setup_cb_call(struct tcf_block *block, struct tcf_exts *exts,
}
EXPORT_SYMBOL(tc_setup_cb_call);

+int tc_setup_flow_action(struct flow_action *flow_action,
+ const struct tcf_exts *exts)
+{
+ const struct tc_action *act;
+ int num_acts = 0, i, j, k;
+
+ if (!exts)
+ return 0;
+
+ tcf_exts_for_each_action(i, act, exts) {
+ if (is_tcf_pedit(act))
+ num_acts += tcf_pedit_nkeys(act);
+ else
+ num_acts++;
+ }
+ if (!num_acts)
+ return 0;
+
+ if (flow_action_init(flow_action, num_acts) < 0)
+ return -ENOMEM;
+
+ j = 0;
+ tcf_exts_for_each_action(i, act, exts) {
+ struct flow_action_key *key;
+
+ key = &flow_action->keys[j];
+ if (is_tcf_gact_ok(act)) {
+ key->id = FLOW_ACTION_KEY_ACCEPT;
+ } else if (is_tcf_gact_shot(act)) {
+ key->id = FLOW_ACTION_KEY_DROP;
+ } else if (is_tcf_gact_trap(act)) {
+ key->id = FLOW_ACTION_KEY_TRAP;
+ } else if (is_tcf_gact_goto_chain(act)) {
+ key->id = FLOW_ACTION_KEY_GOTO;
+ key->chain_index = tcf_gact_goto_chain_index(act);
+ } else if (is_tcf_mirred_egress_redirect(act)) {
+ key->id = FLOW_ACTION_KEY_REDIRECT;
+ key->dev = tcf_mirred_dev(act);
+ } else if (is_tcf_mirred_egress_mirror(act)) {
+ key->id = FLOW_ACTION_KEY_MIRRED;
+ key->dev = tcf_mirred_dev(act);
+ } else if (is_tcf_vlan(act)) {
+ switch (tcf_vlan_action(act)) {
+ case TCA_VLAN_ACT_PUSH:
+ key->id = FLOW_ACTION_KEY_VLAN_PUSH;
+ key->vlan.vid = tcf_vlan_push_vid(act);
+ key->vlan.proto = tcf_vlan_push_proto(act);
+ key->vlan.prio = tcf_vlan_push_prio(act);
+ break;
+ case TCA_VLAN_ACT_POP:
+ key->id = FLOW_ACTION_KEY_VLAN_POP;
+ break;
+ case TCA_VLAN_ACT_MODIFY:
+ key->id = FLOW_ACTION_KEY_VLAN_MANGLE;
+ key->vlan.vid = tcf_vlan_push_vid(act);
+ key->vlan.proto = tcf_vlan_push_proto(act);
+ key->vlan.prio = tcf_vlan_push_prio(act);
+ break;
+ default:
+ goto err_out;
+ }
+ } else if (is_tcf_tunnel_set(act)) {
+ key->id = FLOW_ACTION_KEY_TUNNEL_ENCAP;
+ key->tunnel = tcf_tunnel_info(act);
+ } else if (is_tcf_tunnel_release(act)) {
+ key->id = FLOW_ACTION_KEY_TUNNEL_DECAP;
+ key->tunnel = tcf_tunnel_info(act);
+ } else if (is_tcf_pedit(act)) {
+ for (k = 0; k < tcf_pedit_nkeys(act); k++) {
+ switch (tcf_pedit_cmd(act, k)) {
+ case TCA_PEDIT_KEY_EX_CMD_SET:
+ key->id = FLOW_ACTION_KEY_MANGLE;
+ break;
+ case TCA_PEDIT_KEY_EX_CMD_ADD:
+ key->id = FLOW_ACTION_KEY_ADD;
+ break;
+ default:
+ goto err_out;
+ }
+ key->mangle.htype = tcf_pedit_htype(act, k);
+ key->mangle.mask = tcf_pedit_mask(act, k);
+ key->mangle.val = tcf_pedit_val(act, k);
+ key->mangle.offset = tcf_pedit_offset(act, k);
+ key = &flow_action->keys[++j];
+ }
+ } else if (is_tcf_csum(act)) {
+ key->id = FLOW_ACTION_KEY_CSUM;
+ key->csum_flags = tcf_csum_update_flags(act);
+ } else if (is_tcf_skbedit_mark(act)) {
+ key->id = FLOW_ACTION_KEY_MARK;
+ key->mark = tcf_skbedit_mark(act);
+ } else {
+ goto err_out;
+ }
+
+ if (!is_tcf_pedit(act))
+ j++;
+ }
+ return 0;
+err_out:
+ flow_action_free(flow_action);
+ return -EOPNOTSUPP;
+}
+EXPORT_SYMBOL(tc_setup_flow_action);
+
static __net_init int tcf_net_init(struct net *net)
{
struct tcf_net *tn = net_generic(net, tcf_net_id);
diff --git a/net/sched/cls_flower.c b/net/sched/cls_flower.c
index 26fc129ed504..a301fb8e68e7 100644
--- a/net/sched/cls_flower.c
+++ b/net/sched/cls_flower.c
@@ -104,6 +104,7 @@ struct cls_fl_filter {
u32 in_hw_count;
struct rcu_work rwork;
struct net_device *hw_dev;
+ struct flow_action action;
};

static const struct rhashtable_params mask_ht_params = {
@@ -391,18 +392,27 @@ static int fl_hw_replace_filter(struct tcf_proto *tp,
cls_flower.exts = &f->exts;
cls_flower.classid = f->res.classid;

+ if (tc_setup_flow_action(&f->action, &f->exts) < 0)
+ return -ENOMEM;
+
+ cls_flower.rule.action.keys = f->action.keys;
+ cls_flower.rule.action.num_keys = f->action.num_keys;
+
err = tc_setup_cb_call(block, &f->exts, TC_SETUP_CLSFLOWER,
&cls_flower, skip_sw);
if (err < 0) {
fl_hw_destroy_filter(tp, f, NULL);
+ flow_action_free(&f->action);
return err;
} else if (err > 0) {
f->in_hw_count = err;
tcf_block_offload_inc(block, &f->flags);
}

- if (skip_sw && !(f->flags & TCA_CLS_FLAGS_IN_HW))
+ if (skip_sw && !(f->flags & TCA_CLS_FLAGS_IN_HW)) {
+ flow_action_free(&f->action);
return -EINVAL;
+ }

return 0;
}
@@ -429,6 +439,7 @@ static bool __fl_delete(struct tcf_proto *tp, struct cls_fl_filter *f,
bool async = tcf_exts_get_net(&f->exts);
bool last;

+ flow_action_free(&f->action);
idr_remove(&head->handle_idr, f->handle);
list_del_rcu(&f->list);
last = fl_mask_put(head, f->mask, async);
@@ -1470,6 +1481,8 @@ static int fl_reoffload(struct tcf_proto *tp, bool add, tc_setup_cb_t *cb,
cls_flower.rule.match.mask = &mask->key;
cls_flower.rule.match.key = &f->mkey;
cls_flower.exts = &f->exts;
+ cls_flower.rule.action.num_keys = f->action.num_keys;
+ cls_flower.rule.action.keys = f->action.keys;
cls_flower.classid = f->res.classid;

err = cb(TC_SETUP_CLSFLOWER, &cls_flower, cb_priv);
--
2.11.0