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e9ce1cd3cf
This was simply making templates of functions and mostly causing a lot of code duplication in the classifier action modules. We solve this more cleanly by having a common "struct tcf_common" that hash worker functions contained once in act_api.c can work with. Callers work with real action objects that have the common struct plus their module specific struct members. You go from a common object to the higher level one using a "to_foo()" macro which makes use of container_of() to do the dirty work. This also kills off act_generic.h which was only used by act_simple.c and keeping it around was more work than the it's value. Signed-off-by: David S. Miller <davem@davemloft.net>
224 lines
5.5 KiB
C
224 lines
5.5 KiB
C
/*
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* net/sched/gact.c Generic actions
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* copyright Jamal Hadi Salim (2002-4)
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*
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*/
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/netdevice.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/proc_fs.h>
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#include <net/sock.h>
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#include <net/pkt_sched.h>
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#include <linux/tc_act/tc_gact.h>
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#include <net/tc_act/tc_gact.h>
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#define GACT_TAB_MASK 15
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static struct tcf_common *tcf_gact_ht[GACT_TAB_MASK + 1];
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static u32 gact_idx_gen;
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static DEFINE_RWLOCK(gact_lock);
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static struct tcf_hashinfo gact_hash_info = {
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.htab = tcf_gact_ht,
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.hmask = GACT_TAB_MASK,
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.lock = &gact_lock,
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};
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#ifdef CONFIG_GACT_PROB
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static int gact_net_rand(struct tcf_gact *gact)
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{
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if (net_random() % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcfg_paction;
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}
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static int gact_determ(struct tcf_gact *gact)
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{
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if (gact->tcf_bstats.packets % gact->tcfg_pval)
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return gact->tcf_action;
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return gact->tcfg_paction;
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}
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typedef int (*g_rand)(struct tcf_gact *gact);
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static g_rand gact_rand[MAX_RAND]= { NULL, gact_net_rand, gact_determ };
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#endif /* CONFIG_GACT_PROB */
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static int tcf_gact_init(struct rtattr *rta, struct rtattr *est,
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struct tc_action *a, int ovr, int bind)
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{
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struct rtattr *tb[TCA_GACT_MAX];
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struct tc_gact *parm;
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struct tcf_gact *gact;
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struct tcf_common *pc;
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int ret = 0;
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if (rta == NULL || rtattr_parse_nested(tb, TCA_GACT_MAX, rta) < 0)
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return -EINVAL;
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if (tb[TCA_GACT_PARMS - 1] == NULL ||
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RTA_PAYLOAD(tb[TCA_GACT_PARMS - 1]) < sizeof(*parm))
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return -EINVAL;
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parm = RTA_DATA(tb[TCA_GACT_PARMS - 1]);
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if (tb[TCA_GACT_PROB-1] != NULL)
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#ifdef CONFIG_GACT_PROB
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if (RTA_PAYLOAD(tb[TCA_GACT_PROB-1]) < sizeof(struct tc_gact_p))
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return -EINVAL;
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#else
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return -EOPNOTSUPP;
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#endif
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pc = tcf_hash_check(parm->index, a, bind, &gact_hash_info);
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if (!pc) {
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pc = tcf_hash_create(parm->index, est, a, sizeof(*gact),
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bind, &gact_idx_gen, &gact_hash_info);
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if (unlikely(!pc))
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return -ENOMEM;
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ret = ACT_P_CREATED;
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} else {
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if (!ovr) {
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tcf_hash_release(pc, bind, &gact_hash_info);
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return -EEXIST;
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}
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}
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gact = to_gact(pc);
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spin_lock_bh(&gact->tcf_lock);
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gact->tcf_action = parm->action;
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#ifdef CONFIG_GACT_PROB
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if (tb[TCA_GACT_PROB-1] != NULL) {
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struct tc_gact_p *p_parm = RTA_DATA(tb[TCA_GACT_PROB-1]);
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gact->tcfg_paction = p_parm->paction;
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gact->tcfg_pval = p_parm->pval;
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gact->tcfg_ptype = p_parm->ptype;
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}
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#endif
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spin_unlock_bh(&gact->tcf_lock);
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if (ret == ACT_P_CREATED)
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tcf_hash_insert(pc, &gact_hash_info);
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return ret;
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}
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static int tcf_gact_cleanup(struct tc_action *a, int bind)
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{
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struct tcf_gact *gact = a->priv;
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if (gact)
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return tcf_hash_release(&gact->common, bind, &gact_hash_info);
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return 0;
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}
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static int tcf_gact(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
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{
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struct tcf_gact *gact = a->priv;
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int action = TC_ACT_SHOT;
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spin_lock(&gact->tcf_lock);
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#ifdef CONFIG_GACT_PROB
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if (gact->tcfg_ptype && gact_rand[gact->tcfg_ptype] != NULL)
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action = gact_rand[gact->tcfg_ptype](gact);
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else
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action = gact->tcf_action;
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#else
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action = gact->tcf_action;
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#endif
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gact->tcf_bstats.bytes += skb->len;
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gact->tcf_bstats.packets++;
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if (action == TC_ACT_SHOT)
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gact->tcf_qstats.drops++;
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gact->tcf_tm.lastuse = jiffies;
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spin_unlock(&gact->tcf_lock);
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return action;
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}
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static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
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{
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unsigned char *b = skb->tail;
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struct tc_gact opt;
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struct tcf_gact *gact = a->priv;
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struct tcf_t t;
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opt.index = gact->tcf_index;
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opt.refcnt = gact->tcf_refcnt - ref;
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opt.bindcnt = gact->tcf_bindcnt - bind;
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opt.action = gact->tcf_action;
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RTA_PUT(skb, TCA_GACT_PARMS, sizeof(opt), &opt);
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#ifdef CONFIG_GACT_PROB
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if (gact->tcfg_ptype) {
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struct tc_gact_p p_opt;
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p_opt.paction = gact->tcfg_paction;
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p_opt.pval = gact->tcfg_pval;
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p_opt.ptype = gact->tcfg_ptype;
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RTA_PUT(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt);
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}
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#endif
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t.install = jiffies_to_clock_t(jiffies - gact->tcf_tm.install);
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t.lastuse = jiffies_to_clock_t(jiffies - gact->tcf_tm.lastuse);
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t.expires = jiffies_to_clock_t(gact->tcf_tm.expires);
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RTA_PUT(skb, TCA_GACT_TM, sizeof(t), &t);
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return skb->len;
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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static struct tc_action_ops act_gact_ops = {
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.kind = "gact",
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.hinfo = &gact_hash_info,
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.type = TCA_ACT_GACT,
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.capab = TCA_CAP_NONE,
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.owner = THIS_MODULE,
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.act = tcf_gact,
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.dump = tcf_gact_dump,
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.cleanup = tcf_gact_cleanup,
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.lookup = tcf_hash_search,
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.init = tcf_gact_init,
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.walk = tcf_generic_walker
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};
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MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
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MODULE_DESCRIPTION("Generic Classifier actions");
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MODULE_LICENSE("GPL");
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static int __init gact_init_module(void)
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{
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#ifdef CONFIG_GACT_PROB
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printk("GACT probability on\n");
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#else
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printk("GACT probability NOT on\n");
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#endif
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return tcf_register_action(&act_gact_ops);
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}
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static void __exit gact_cleanup_module(void)
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{
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tcf_unregister_action(&act_gact_ops);
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}
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module_init(gact_init_module);
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module_exit(gact_cleanup_module);
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