/* * net/sched/gact.c Generic actions * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * * 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 <linux/tc_act/tc_gact.h> #include <net/tc_act/tc_gact.h> #define GACT_TAB_MASK 15 static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1]; static u32 gact_idx_gen; static DEFINE_RWLOCK(gact_lock); static struct tcf_hashinfo gact_hash_info = { .htab = tcf_gact_ht, .hmask = GACT_TAB_MASK, .lock = &gact_lock, }; #ifdef CONFIG_GACT_PROB static int gact_net_rand(struct tcf_gact *gact) { if (!gact->tcfg_pval || net_random() % gact->tcfg_pval) return gact->tcf_action; return gact->tcfg_paction; } static int gact_determ(struct tcf_gact *gact) { if (!gact->tcfg_pval || gact->tcf_bstats.packets % 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 nlattr *nla, struct nlattr *est, struct tc_action *a, int ovr, int bind) { struct nlattr *tb[TCA_GACT_MAX + 1]; struct tc_gact *parm; struct tcf_gact *gact; struct tcf_common *pc; int ret = 0; int err; if (nla == NULL) return -EINVAL; err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy); if (err < 0) return err; if (tb[TCA_GACT_PARMS] == NULL) return -EINVAL; parm = nla_data(tb[TCA_GACT_PARMS]); #ifndef CONFIG_GACT_PROB if (tb[TCA_GACT_PROB] != NULL) return -EOPNOTSUPP; #endif pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info); if (!pc) { pc = tcf_hash_create(parm->index, est, a, sizeof(*gact), bind, &gact_idx_gen, &gact_hash_info); if (IS_ERR(pc)) return PTR_ERR(pc); ret = ACT_P_CREATED; } else { if (!ovr) { tcf_hash_release(pc, bind, &gact_hash_info); return -EEXIST; } } gact = to_gact(pc); spin_lock_bh(&gact->tcf_lock); gact->tcf_action = parm->action; #ifdef CONFIG_GACT_PROB if (tb[TCA_GACT_PROB] != NULL) { struct tc_gact_p *p_parm = nla_data(tb[TCA_GACT_PROB]); gact->tcfg_paction = p_parm->paction; gact->tcfg_pval = p_parm->pval; gact->tcfg_ptype = p_parm->ptype; } #endif spin_unlock_bh(&gact->tcf_lock); if (ret == ACT_P_CREATED) tcf_hash_insert(pc, &gact_hash_info); return ret; } static int tcf_gact_cleanup(struct tc_action *a, int bind) { struct tcf_gact *gact = a->priv; if (gact) return tcf_hash_release(&gact->common, bind, &gact_hash_info); return 0; } static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res) { struct tcf_gact *gact = a->priv; int action = TC_ACT_SHOT; spin_lock(&gact->tcf_lock); #ifdef CONFIG_GACT_PROB if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL) action = gact_rand[gact->tcfg_ptype](gact); else action = gact->tcf_action; #else action = gact->tcf_action; #endif gact->tcf_bstats.bytes += qdisc_pkt_len(skb); gact->tcf_bstats.packets++; if (action == TC_ACT_SHOT) gact->tcf_qstats.drops++; gact->tcf_tm.lastuse = jiffies; spin_unlock(&gact->tcf_lock); return action; } 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 = a->priv; struct tc_gact opt = { .index = gact->tcf_index, .refcnt = gact->tcf_refcnt - ref, .bindcnt = gact->tcf_bindcnt - bind, .action = gact->tcf_action, }; struct tcf_t t; NLA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt); #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, }; NLA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt); } #endif t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install); t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse); t.expires = jiffies_to_clock_t(gact->tcf_tm.expires); NLA_PUT(skb, TCA_GACT_TM, sizeof(t), &t); return skb->len; nla_put_failure: nlmsg_trim(skb, b); return -1; } static struct tc_action_ops act_gact_ops = { .kind = "gact", .hinfo = &gact_hash_info, .type = TCA_ACT_GACT, .capab = TCA_CAP_NONE, .owner = THIS_MODULE, .act = tcf_gact, .dump = tcf_gact_dump, .cleanup = tcf_gact_cleanup, .lookup = tcf_hash_search, .init = tcf_gact_init, .walk = tcf_generic_walker }; 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); } static void __exit gact_cleanup_module(void) { tcf_unregister_action(&act_gact_ops); } module_init(gact_init_module); module_exit(gact_cleanup_module);