From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- net/sched/act_gact.c | 338 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 338 insertions(+) create mode 100644 net/sched/act_gact.c (limited to 'net/sched/act_gact.c') diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c new file mode 100644 index 000000000..62d682b96 --- /dev/null +++ b/net/sched/act_gact.c @@ -0,0 +1,338 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * net/sched/act_gact.c Generic actions + * + * copyright Jamal Hadi Salim (2002-4) + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +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_max(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, act_gact_ops.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 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, + struct netlink_ext_ack *extack) +{ + 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 if (is_tcf_gact_continue(act)) { + NL_SET_ERR_MSG_MOD(extack, "Offload of \"continue\" action is not supported"); + return -EOPNOTSUPP; + } else if (is_tcf_gact_reclassify(act)) { + NL_SET_ERR_MSG_MOD(extack, "Offload of \"reclassify\" action is not supported"); + return -EOPNOTSUPP; + } else if (is_tcf_gact_pipe(act)) { + NL_SET_ERR_MSG_MOD(extack, "Offload of \"pipe\" action is not supported"); + return -EOPNOTSUPP; + } else { + NL_SET_ERR_MSG_MOD(extack, "Unsupported generic action offload"); + 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, + .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, act_gact_ops.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, act_gact_ops.net_id); +} + +static struct pernet_operations gact_net_ops = { + .init = gact_init_net, + .exit_batch = gact_exit_net, + .id = &act_gact_ops.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); -- cgit v1.2.3