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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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9469f375ab
in the following command: # tc action add action <c1> random <rand_type> <c2> <rand_param> 'goto chain x' is allowed only for c1: setting it for c2 makes the kernel crash with NULL pointer dereference, since TC core doesn't initialize the chain handle. Signed-off-by: Davide Caratti <dcaratti@redhat.com> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Acked-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
309 lines
7.5 KiB
C
309 lines
7.5 KiB
C
/*
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* net/sched/act_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 <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.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 <net/netlink.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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static unsigned int gact_net_id;
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static struct tc_action_ops act_gact_ops;
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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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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (prandom_u32() % 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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u32 pack = atomic_inc_return(&gact->packets);
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smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
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if (pack % 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 const struct nla_policy gact_policy[TCA_GACT_MAX + 1] = {
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[TCA_GACT_PARMS] = { .len = sizeof(struct tc_gact) },
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[TCA_GACT_PROB] = { .len = sizeof(struct tc_gact_p) },
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};
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static int tcf_gact_init(struct net *net, struct nlattr *nla,
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struct nlattr *est, struct tc_action **a,
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int ovr, int bind, bool rtnl_held,
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struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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struct nlattr *tb[TCA_GACT_MAX + 1];
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struct tc_gact *parm;
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struct tcf_gact *gact;
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int ret = 0;
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int err;
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#ifdef CONFIG_GACT_PROB
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struct tc_gact_p *p_parm = NULL;
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#endif
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if (nla == NULL)
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return -EINVAL;
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err = nla_parse_nested(tb, TCA_GACT_MAX, nla, gact_policy, NULL);
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if (err < 0)
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return err;
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if (tb[TCA_GACT_PARMS] == NULL)
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return -EINVAL;
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parm = nla_data(tb[TCA_GACT_PARMS]);
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#ifndef CONFIG_GACT_PROB
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if (tb[TCA_GACT_PROB] != NULL)
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return -EOPNOTSUPP;
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#else
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if (tb[TCA_GACT_PROB]) {
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p_parm = nla_data(tb[TCA_GACT_PROB]);
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if (p_parm->ptype >= MAX_RAND)
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return -EINVAL;
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if (TC_ACT_EXT_CMP(p_parm->paction, TC_ACT_GOTO_CHAIN)) {
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NL_SET_ERR_MSG(extack,
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"goto chain not allowed on fallback");
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return -EINVAL;
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}
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}
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#endif
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err = tcf_idr_check_alloc(tn, &parm->index, a, bind);
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if (!err) {
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ret = tcf_idr_create(tn, parm->index, est, a,
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&act_gact_ops, bind, true);
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if (ret) {
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tcf_idr_cleanup(tn, parm->index);
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return ret;
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}
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ret = ACT_P_CREATED;
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} else if (err > 0) {
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if (bind)/* dont override defaults */
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return 0;
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if (!ovr) {
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tcf_idr_release(*a, bind);
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return -EEXIST;
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}
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} else {
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return err;
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}
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gact = to_gact(*a);
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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 (p_parm) {
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gact->tcfg_paction = p_parm->paction;
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gact->tcfg_pval = max_t(u16, 1, p_parm->pval);
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/* Make sure tcfg_pval is written before tcfg_ptype
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* coupled with smp_rmb() in gact_net_rand() & gact_determ()
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*/
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smp_wmb();
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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_idr_insert(tn, *a);
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return ret;
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}
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static int tcf_gact_act(struct sk_buff *skb, const struct tc_action *a,
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struct tcf_result *res)
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{
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struct tcf_gact *gact = to_gact(a);
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int action = READ_ONCE(gact->tcf_action);
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#ifdef CONFIG_GACT_PROB
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{
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u32 ptype = READ_ONCE(gact->tcfg_ptype);
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if (ptype)
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action = gact_rand[ptype](gact);
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}
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#endif
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bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), skb);
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if (action == TC_ACT_SHOT)
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qstats_drop_inc(this_cpu_ptr(gact->common.cpu_qstats));
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tcf_lastuse_update(&gact->tcf_tm);
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return action;
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}
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static void tcf_gact_stats_update(struct tc_action *a, u64 bytes, u32 packets,
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u64 lastuse, bool hw)
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{
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struct tcf_gact *gact = to_gact(a);
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int action = READ_ONCE(gact->tcf_action);
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struct tcf_t *tm = &gact->tcf_tm;
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_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats), bytes,
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packets);
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if (action == TC_ACT_SHOT)
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this_cpu_ptr(gact->common.cpu_qstats)->drops += packets;
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if (hw)
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_bstats_cpu_update(this_cpu_ptr(gact->common.cpu_bstats_hw),
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bytes, packets);
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tm->lastuse = max_t(u64, tm->lastuse, lastuse);
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}
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static int tcf_gact_dump(struct sk_buff *skb, struct tc_action *a,
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int bind, int ref)
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{
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unsigned char *b = skb_tail_pointer(skb);
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struct tcf_gact *gact = to_gact(a);
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struct tc_gact opt = {
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.index = gact->tcf_index,
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.refcnt = refcount_read(&gact->tcf_refcnt) - ref,
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.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
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};
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struct tcf_t t;
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spin_lock_bh(&gact->tcf_lock);
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opt.action = gact->tcf_action;
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if (nla_put(skb, TCA_GACT_PARMS, sizeof(opt), &opt))
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goto nla_put_failure;
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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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.paction = gact->tcfg_paction,
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.pval = gact->tcfg_pval,
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.ptype = gact->tcfg_ptype,
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};
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if (nla_put(skb, TCA_GACT_PROB, sizeof(p_opt), &p_opt))
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goto nla_put_failure;
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}
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#endif
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tcf_tm_dump(&t, &gact->tcf_tm);
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if (nla_put_64bit(skb, TCA_GACT_TM, sizeof(t), &t, TCA_GACT_PAD))
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goto nla_put_failure;
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spin_unlock_bh(&gact->tcf_lock);
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return skb->len;
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nla_put_failure:
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spin_unlock_bh(&gact->tcf_lock);
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nlmsg_trim(skb, b);
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return -1;
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}
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static int tcf_gact_walker(struct net *net, struct sk_buff *skb,
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struct netlink_callback *cb, int type,
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const struct tc_action_ops *ops,
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struct netlink_ext_ack *extack)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tcf_generic_walker(tn, skb, cb, type, ops, extack);
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}
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static int tcf_gact_search(struct net *net, struct tc_action **a, u32 index)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tcf_idr_search(tn, a, index);
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}
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static size_t tcf_gact_get_fill_size(const struct tc_action *act)
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{
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size_t sz = nla_total_size(sizeof(struct tc_gact)); /* TCA_GACT_PARMS */
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#ifdef CONFIG_GACT_PROB
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if (to_gact(act)->tcfg_ptype)
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/* TCA_GACT_PROB */
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sz += nla_total_size(sizeof(struct tc_gact_p));
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#endif
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return sz;
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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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.type = TCA_ACT_GACT,
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.owner = THIS_MODULE,
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.act = tcf_gact_act,
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.stats_update = tcf_gact_stats_update,
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.dump = tcf_gact_dump,
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.init = tcf_gact_init,
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.walk = tcf_gact_walker,
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.lookup = tcf_gact_search,
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.get_fill_size = tcf_gact_get_fill_size,
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.size = sizeof(struct tcf_gact),
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};
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static __net_init int gact_init_net(struct net *net)
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{
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struct tc_action_net *tn = net_generic(net, gact_net_id);
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return tc_action_net_init(tn, &act_gact_ops);
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}
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static void __net_exit gact_exit_net(struct list_head *net_list)
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{
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tc_action_net_exit(net_list, gact_net_id);
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}
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static struct pernet_operations gact_net_ops = {
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.init = gact_init_net,
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.exit_batch = gact_exit_net,
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.id = &gact_net_id,
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.size = sizeof(struct tc_action_net),
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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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pr_info("GACT probability on\n");
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#else
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pr_info("GACT probability NOT on\n");
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#endif
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return tcf_register_action(&act_gact_ops, &gact_net_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, &gact_net_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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