mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
347 lines
8.5 KiB
347 lines
8.5 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* net/sched/act_gact.c Generic actions |
|
* |
|
* copyright Jamal Hadi Salim (2002-4) |
|
*/ |
|
|
|
#include <linux/types.h> |
|
#include <linux/kernel.h> |
|
#include <linux/string.h> |
|
#include <linux/errno.h> |
|
#include <linux/skbuff.h> |
|
#include <linux/rtnetlink.h> |
|
#include <linux/module.h> |
|
#include <linux/init.h> |
|
#include <net/netlink.h> |
|
#include <net/pkt_sched.h> |
|
#include <net/pkt_cls.h> |
|
#include <linux/tc_act/tc_gact.h> |
|
#include <net/tc_act/tc_gact.h> |
|
|
|
static unsigned int gact_net_id; |
|
static struct tc_action_ops act_gact_ops; |
|
|
|
#ifdef CONFIG_GACT_PROB |
|
static int gact_net_rand(struct tcf_gact *gact) |
|
{ |
|
smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
|
if (prandom_u32() % gact->tcfg_pval) |
|
return gact->tcf_action; |
|
return gact->tcfg_paction; |
|
} |
|
|
|
static int gact_determ(struct tcf_gact *gact) |
|
{ |
|
u32 pack = atomic_inc_return(&gact->packets); |
|
|
|
smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */ |
|
if (pack % gact->tcfg_pval) |
|
return gact->tcf_action; |
|
return gact->tcfg_paction; |
|
} |
|
|
|
typedef int (*g_rand)(struct tcf_gact *gact); |
|
static g_rand gact_rand[MAX_RAND] = { NULL, gact_net_rand, gact_determ }; |
|
#endif /* CONFIG_GACT_PROB */ |
|
|
|
static const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = { |
|
[TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) }, |
|
[TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) }, |
|
}; |
|
|
|
static int tcf_gact_init(struct net *net, struct nlattr *nla, |
|
struct nlattr *est, struct tc_action **a, |
|
struct tcf_proto *tp, u32 flags, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, gact_net_id); |
|
bool bind = flags & TCA_ACT_FLAGS_BIND; |
|
struct nlattr *tb[TCA_GACT_MAX + 1]; |
|
struct tcf_chain *goto_ch = NULL; |
|
struct tc_gact *parm; |
|
struct tcf_gact *gact; |
|
int ret = 0; |
|
u32 index; |
|
int err; |
|
#ifdef CONFIG_GACT_PROB |
|
struct tc_gact_p *p_parm = NULL; |
|
#endif |
|
|
|
if (nla == NULL) |
|
return -EINVAL; |
|
|
|
err = nla_parse_nested_deprecated(tb, TCA_GACT_MAX, nla, gact_policy, |
|
NULL); |
|
if (err < 0) |
|
return err; |
|
|
|
if (tb[TCA_GACT_PARMS] == NULL) |
|
return -EINVAL; |
|
parm = nla_data(tb[TCA_GACT_PARMS]); |
|
index = parm->index; |
|
|
|
#ifndef CONFIG_GACT_PROB |
|
if (tb[TCA_GACT_PROB] != NULL) |
|
return -EOPNOTSUPP; |
|
#else |
|
if (tb[TCA_GACT_PROB]) { |
|
p_parm = nla_data(tb[TCA_GACT_PROB]); |
|
if (p_parm->ptype >= MAX_RAND) |
|
return -EINVAL; |
|
if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) { |
|
NL_SET_ERR_MSG(extack, |
|
"goto chain not allowed on fallback"); |
|
return -EINVAL; |
|
} |
|
} |
|
#endif |
|
|
|
err = tcf_idr_check_alloc(tn, &index, a, bind); |
|
if (!err) { |
|
ret = tcf_idr_create_from_flags(tn, index, est, a, |
|
&act_gact_ops, bind, flags); |
|
if (ret) { |
|
tcf_idr_cleanup(tn, index); |
|
return ret; |
|
} |
|
ret = ACT_P_CREATED; |
|
} else if (err > 0) { |
|
if (bind)/* dont override defaults */ |
|
return 0; |
|
if (!(flags & TCA_ACT_FLAGS_REPLACE)) { |
|
tcf_idr_release(*a, bind); |
|
return -EEXIST; |
|
} |
|
} else { |
|
return err; |
|
} |
|
|
|
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack); |
|
if (err < 0) |
|
goto release_idr; |
|
gact = to_gact(*a); |
|
|
|
spin_lock_bh(&gact->tcf_lock); |
|
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch); |
|
#ifdef CONFIG_GACT_PROB |
|
if (p_parm) { |
|
gact->tcfg_paction = p_parm->paction; |
|
gact->tcfg_pval = max_t(u16, 1, p_parm->pval); |
|
/* Make sure tcfg_pval is written before tcfg_ptype |
|
* coupled with smp_rmb() in gact_net_rand() & gact_determ() |
|
*/ |
|
smp_wmb(); |
|
gact->tcfg_ptype = p_parm->ptype; |
|
} |
|
#endif |
|
spin_unlock_bh(&gact->tcf_lock); |
|
|
|
if (goto_ch) |
|
tcf_chain_put_by_act(goto_ch); |
|
|
|
return ret; |
|
release_idr: |
|
tcf_idr_release(*a, bind); |
|
return err; |
|
} |
|
|
|
static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a, |
|
struct tcf_result *res) |
|
{ |
|
struct tcf_gact *gact = to_gact(a); |
|
int action = READ_ONCE(gact->tcf_action); |
|
|
|
#ifdef CONFIG_GACT_PROB |
|
{ |
|
u32 ptype = READ_ONCE(gact->tcfg_ptype); |
|
|
|
if (ptype) |
|
action = gact_rand[ptype](gact); |
|
} |
|
#endif |
|
tcf_action_update_bstats(&gact->common, skb); |
|
if (action == TC_ACT_SHOT) |
|
tcf_action_inc_drop_qstats(&gact->common); |
|
|
|
tcf_lastuse_update(&gact->tcf_tm); |
|
|
|
return action; |
|
} |
|
|
|
static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u64 packets, |
|
u64 drops, u64 lastuse, bool hw) |
|
{ |
|
struct tcf_gact *gact = to_gact(a); |
|
int action = READ_ONCE(gact->tcf_action); |
|
struct tcf_t *tm = &gact->tcf_tm; |
|
|
|
tcf_action_update_stats(a, bytes, packets, |
|
action == TC_ACT_SHOT ? packets : drops, hw); |
|
tm->lastuse = max_t(u64, tm->lastuse, lastuse); |
|
} |
|
|
|
static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, |
|
int bind, int ref) |
|
{ |
|
unsigned char *b = skb_tail_pointer(skb); |
|
struct tcf_gact *gact = to_gact(a); |
|
struct tc_gact opt = { |
|
.index = gact->tcf_index, |
|
.refcnt = refcount_read(&gact->tcf_refcnt) - ref, |
|
.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind, |
|
}; |
|
struct tcf_t t; |
|
|
|
spin_lock_bh(&gact->tcf_lock); |
|
opt.action = gact->tcf_action; |
|
if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt)) |
|
goto nla_put_failure; |
|
#ifdef CONFIG_GACT_PROB |
|
if (gact->tcfg_ptype) { |
|
struct tc_gact_p p_opt = { |
|
.paction = gact->tcfg_paction, |
|
.pval = gact->tcfg_pval, |
|
.ptype = gact->tcfg_ptype, |
|
}; |
|
|
|
if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt)) |
|
goto nla_put_failure; |
|
} |
|
#endif |
|
tcf_tm_dump(&t, &gact->tcf_tm); |
|
if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD)) |
|
goto nla_put_failure; |
|
spin_unlock_bh(&gact->tcf_lock); |
|
|
|
return skb->len; |
|
|
|
nla_put_failure: |
|
spin_unlock_bh(&gact->tcf_lock); |
|
nlmsg_trim(skb, b); |
|
return -1; |
|
} |
|
|
|
static int tcf_gact_walker(struct net *net, struct sk_buff *skb, |
|
struct netlink_callback *cb, int type, |
|
const struct tc_action_ops *ops, |
|
struct netlink_ext_ack *extack) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, gact_net_id); |
|
|
|
return tcf_generic_walker(tn, skb, cb, type, ops, extack); |
|
} |
|
|
|
static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, gact_net_id); |
|
|
|
return tcf_idr_search(tn, a, index); |
|
} |
|
|
|
static size_t tcf_gact_get_fill_size(const struct tc_action *act) |
|
{ |
|
size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */ |
|
|
|
#ifdef CONFIG_GACT_PROB |
|
if (to_gact(act)->tcfg_ptype) |
|
/* TCA_GACT_PROB */ |
|
sz += nla_total_size(sizeof(struct tc_gact_p)); |
|
#endif |
|
|
|
return sz; |
|
} |
|
|
|
static int tcf_gact_offload_act_setup(struct tc_action *act, void *entry_data, |
|
u32 *index_inc, bool bind) |
|
{ |
|
if (bind) { |
|
struct flow_action_entry *entry = entry_data; |
|
|
|
if (is_tcf_gact_ok(act)) { |
|
entry->id = FLOW_ACTION_ACCEPT; |
|
} else if (is_tcf_gact_shot(act)) { |
|
entry->id = FLOW_ACTION_DROP; |
|
} else if (is_tcf_gact_trap(act)) { |
|
entry->id = FLOW_ACTION_TRAP; |
|
} else if (is_tcf_gact_goto_chain(act)) { |
|
entry->id = FLOW_ACTION_GOTO; |
|
entry->chain_index = tcf_gact_goto_chain_index(act); |
|
} else { |
|
return -EOPNOTSUPP; |
|
} |
|
*index_inc = 1; |
|
} else { |
|
struct flow_offload_action *fl_action = entry_data; |
|
|
|
if (is_tcf_gact_ok(act)) |
|
fl_action->id = FLOW_ACTION_ACCEPT; |
|
else if (is_tcf_gact_shot(act)) |
|
fl_action->id = FLOW_ACTION_DROP; |
|
else if (is_tcf_gact_trap(act)) |
|
fl_action->id = FLOW_ACTION_TRAP; |
|
else if (is_tcf_gact_goto_chain(act)) |
|
fl_action->id = FLOW_ACTION_GOTO; |
|
else |
|
return -EOPNOTSUPP; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static struct tc_action_ops act_gact_ops = { |
|
.kind = "gact", |
|
.id = TCA_ID_GACT, |
|
.owner = THIS_MODULE, |
|
.act = tcf_gact_act, |
|
.stats_update = tcf_gact_stats_update, |
|
.dump = tcf_gact_dump, |
|
.init = tcf_gact_init, |
|
.walk = tcf_gact_walker, |
|
.lookup = tcf_gact_search, |
|
.get_fill_size = tcf_gact_get_fill_size, |
|
.offload_act_setup = tcf_gact_offload_act_setup, |
|
.size = sizeof(struct tcf_gact), |
|
}; |
|
|
|
static __net_init int gact_init_net(struct net *net) |
|
{ |
|
struct tc_action_net *tn = net_generic(net, gact_net_id); |
|
|
|
return tc_action_net_init(net, tn, &act_gact_ops); |
|
} |
|
|
|
static void __net_exit gact_exit_net(struct list_head *net_list) |
|
{ |
|
tc_action_net_exit(net_list, gact_net_id); |
|
} |
|
|
|
static struct pernet_operations gact_net_ops = { |
|
.init = gact_init_net, |
|
.exit_batch = gact_exit_net, |
|
.id = &gact_net_id, |
|
.size = sizeof(struct tc_action_net), |
|
}; |
|
|
|
MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); |
|
MODULE_DESCRIPTION("Generic Classifier actions"); |
|
MODULE_LICENSE("GPL"); |
|
|
|
static int __init gact_init_module(void) |
|
{ |
|
#ifdef CONFIG_GACT_PROB |
|
pr_info("GACT probability on\n"); |
|
#else |
|
pr_info("GACT probability NOT on\n"); |
|
#endif |
|
|
|
return tcf_register_action(&act_gact_ops, &gact_net_ops); |
|
} |
|
|
|
static void __exit gact_cleanup_module(void) |
|
{ |
|
tcf_unregister_action(&act_gact_ops, &gact_net_ops); |
|
} |
|
|
|
module_init(gact_init_module); |
|
module_exit(gact_cleanup_module);
|
|
|