| /* |
| * 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_hashinfo gact_hash_info; |
| |
| #ifdef CONFIG_GACT_PROB |
| static int gact_net_rand(struct tcf_gact *gact) |
| { |
| if (!gact->tcfg_pval || prandom_u32() % 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 net *net, 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; |
| #ifdef CONFIG_GACT_PROB |
| struct tc_gact_p *p_parm = NULL; |
| #endif |
| |
| 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; |
| #else |
| if (tb[TCA_GACT_PROB]) { |
| p_parm = nla_data(tb[TCA_GACT_PROB]); |
| if (p_parm->ptype >= MAX_RAND) |
| return -EINVAL; |
| } |
| #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_hash_info); |
| if (IS_ERR(pc)) |
| return PTR_ERR(pc); |
| ret = ACT_P_CREATED; |
| } else { |
| if (bind)/* dont override defaults */ |
| return 0; |
| tcf_hash_release(pc, bind, &gact_hash_info); |
| if (!ovr) |
| return -EEXIST; |
| } |
| |
| gact = to_gact(pc); |
| |
| spin_lock_bh(&gact->tcf_lock); |
| gact->tcf_action = parm->action; |
| #ifdef CONFIG_GACT_PROB |
| if (p_parm) { |
| 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, const 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) |
| 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; |
| |
| 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 |
| 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); |
| if (nla_put(skb, TCA_GACT_TM, sizeof(t), &t)) |
| goto nla_put_failure; |
| 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, |
| .init = tcf_gact_init, |
| }; |
| |
| MODULE_AUTHOR("Jamal Hadi Salim(2002-4)"); |
| MODULE_DESCRIPTION("Generic Classifier actions"); |
| MODULE_LICENSE("GPL"); |
| |
| static int __init gact_init_module(void) |
| { |
| int err = tcf_hashinfo_init(&gact_hash_info, GACT_TAB_MASK); |
| if (err) |
| return err; |
| #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); |
| tcf_hashinfo_destroy(&gact_hash_info); |
| } |
| |
| module_init(gact_init_module); |
| module_exit(gact_cleanup_module); |