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net: sched: add termination action to allow goto chain
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Introduce new type of termination action called "goto_chain". This allows
user to specify a chain to be processed. This action type is
then processed as a return value in tcf_classify loop in similar
way as "reclassify" is, only it does not reset to the first filter
in chain but rather reset to the first filter of the desired chain.

Signed-off-by: Jiri Pirko <jiri@mellanox.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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jpirko authored and davem330 committed May 17, 2017
1 parent 9fb9f25 commit db50514
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Showing 5 changed files with 54 additions and 3 deletions.
1 change: 1 addition & 0 deletions include/net/act_api.h
Original file line number Diff line number Diff line change
Expand Up @@ -42,6 +42,7 @@ struct tc_action {
struct gnet_stats_basic_cpu __percpu *cpu_bstats;
struct gnet_stats_queue __percpu *cpu_qstats;
struct tc_cookie *act_cookie;
struct tcf_chain *goto_chain;
};
#define tcf_head common.tcfa_head
#define tcf_index common.tcfa_index
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9 changes: 7 additions & 2 deletions include/net/sch_generic.h
Original file line number Diff line number Diff line change
Expand Up @@ -193,8 +193,13 @@ struct Qdisc_ops {


struct tcf_result {
unsigned long class;
u32 classid;
union {
struct {
unsigned long class;
u32 classid;
};
const struct tcf_proto *goto_tp;
};
};

struct tcf_proto_ops {
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1 change: 1 addition & 0 deletions include/uapi/linux/pkt_cls.h
Original file line number Diff line number Diff line change
Expand Up @@ -51,6 +51,7 @@ enum {
(((combined) & (~TC_ACT_EXT_VAL_MASK)) == opcode)

#define TC_ACT_JUMP __TC_ACT_EXT(1)
#define TC_ACT_GOTO_CHAIN __TC_ACT_EXT(2)

/* Action type identifiers*/
enum {
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40 changes: 40 additions & 0 deletions net/sched/act_api.c
Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,31 @@
#include <net/act_api.h>
#include <net/netlink.h>

static int tcf_action_goto_chain_init(struct tc_action *a, struct tcf_proto *tp)
{
u32 chain_index = a->tcfa_action & TC_ACT_EXT_VAL_MASK;

if (!tp)
return -EINVAL;
a->goto_chain = tcf_chain_get(tp->chain->block, chain_index);
if (!a->goto_chain)
return -ENOMEM;
return 0;
}

static void tcf_action_goto_chain_fini(struct tc_action *a)
{
tcf_chain_put(a->goto_chain);
}

static void tcf_action_goto_chain_exec(const struct tc_action *a,
struct tcf_result *res)
{
const struct tcf_chain *chain = a->goto_chain;

res->goto_tp = rcu_dereference_bh(chain->filter_chain);
}

static void free_tcf(struct rcu_head *head)
{
struct tc_action *p = container_of(head, struct tc_action, tcfa_rcu);
Expand All @@ -39,6 +64,8 @@ static void free_tcf(struct rcu_head *head)
kfree(p->act_cookie->data);
kfree(p->act_cookie);
}
if (p->goto_chain)
tcf_action_goto_chain_fini(p);

kfree(p);
}
Expand Down Expand Up @@ -465,6 +492,8 @@ int tcf_action_exec(struct sk_buff *skb, struct tc_action **actions,
else /* faulty graph, stop pipeline */
return TC_ACT_OK;
}
} else if (TC_ACT_EXT_CMP(ret, TC_ACT_GOTO_CHAIN)) {
tcf_action_goto_chain_exec(a, res);
}

if (ret != TC_ACT_PIPE)
Expand Down Expand Up @@ -657,6 +686,17 @@ struct tc_action *tcf_action_init_1(struct net *net, struct tcf_proto *tp,
if (err != ACT_P_CREATED)
module_put(a_o->owner);

if (TC_ACT_EXT_CMP(a->tcfa_action, TC_ACT_GOTO_CHAIN)) {
err = tcf_action_goto_chain_init(a, tp);
if (err) {
LIST_HEAD(actions);

list_add_tail(&a->list, &actions);
tcf_action_destroy(&actions, bind);
return ERR_PTR(err);
}
}

return a;

err_mod:
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6 changes: 5 additions & 1 deletion net/sched/cls_api.c
Original file line number Diff line number Diff line change
Expand Up @@ -307,8 +307,12 @@ int tcf_classify(struct sk_buff *skb, const struct tcf_proto *tp,

err = tp->classify(skb, tp, res);
#ifdef CONFIG_NET_CLS_ACT
if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode))
if (unlikely(err == TC_ACT_RECLASSIFY && !compat_mode)) {
goto reset;
} else if (unlikely(TC_ACT_EXT_CMP(err, TC_ACT_GOTO_CHAIN))) {
old_tp = res->goto_tp;
goto reset;
}
#endif
if (err >= 0)
return err;
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