[PKT_SCHED]: Prefix tc actions with act_

Clean up the net/sched directory a bit by prefix all actions with act_.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 328 insertions, 0 deletions

diff --git a/net/sched/act_ipt.c b/net/sched/act_ipt.c
new file mode 100644
index 000000000000..b5001939b74b
--- /dev/null
+++ b/net/sched/act_ipt.c
@@ -0,0 +1,328 @@
+/*
+ * net/sched/ipt.c      iptables target interface
+ *
+ *TODO: Add other tables. For now we only support the ipv4 table targets
+ *
+ *              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 <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/bitops.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in.h>
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/proc_fs.h>
+#include <linux/kmod.h>
+#include <net/sock.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_ipt.h>
+#include <net/tc_act/tc_ipt.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+/* use generic hash table */
+#define MY_TAB_SIZE     16
+#define MY_TAB_MASK     15
+
+static u32 idx_gen;
+static struct tcf_ipt *tcf_ipt_ht[MY_TAB_SIZE];
+/* ipt hash table lock */
+static DEFINE_RWLOCK(ipt_lock);
+
+/* ovewrride the defaults */
+#define tcf_st          tcf_ipt
+#define tcf_t_lock      ipt_lock
+#define tcf_ht          tcf_ipt_ht
+
+#define CONFIG_NET_ACT_INIT
+#include <net/pkt_act.h>
+
+static int
+ipt_init_target(struct ipt_entry_target *t, char *table, unsigned int hook)
+{
+        struct ipt_target *target;
+        int ret = 0;
+
+        target = ipt_find_target(t->u.user.name, t->u.user.revision);
+        if (!target)
+                return -ENOENT;
+
+        DPRINTK("ipt_init_target: found %s\n", target->name);
+        t->u.kernel.target = target;
+
+        if (t->u.kernel.target->checkentry
+            && !t->u.kernel.target->checkentry(table, NULL, t->data,
+                                               t->u.target_size - sizeof(*t),
+                                               hook)) {
+                DPRINTK("ipt_init_target: check failed for `%s'.\n",
+                        t->u.kernel.target->name);
+                module_put(t->u.kernel.target->me);
+                ret = -EINVAL;
+        }
+
+        return ret;
+}
+
+static void
+ipt_destroy_target(struct ipt_entry_target *t)
+{
+        if (t->u.kernel.target->destroy)
+                t->u.kernel.target->destroy(t->data,
+                                            t->u.target_size - sizeof(*t));
+        module_put(t->u.kernel.target->me);
+}
+
+static int
+tcf_ipt_release(struct tcf_ipt *p, int bind)
+{
+        int ret = 0;
+        if (p) {
+                if (bind)
+                        p->bindcnt--;
+                p->refcnt--;
+                if (p->bindcnt <= 0 && p->refcnt <= 0) {
+                        ipt_destroy_target(p->t);
+                        kfree(p->tname);
+                        kfree(p->t);
+                        tcf_hash_destroy(p);
+                        ret = ACT_P_DELETED;
+                }
+        }
+        return ret;
+}
+
+static int
+tcf_ipt_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
+             int ovr, int bind)
+{
+        struct rtattr *tb[TCA_IPT_MAX];
+        struct tcf_ipt *p;
+        struct ipt_entry_target *td, *t;
+        char *tname;
+        int ret = 0, err;
+        u32 hook = 0;
+        u32 index = 0;
+
+        if (rta == NULL || rtattr_parse_nested(tb, TCA_IPT_MAX, rta) < 0)
+                return -EINVAL;
+
+        if (tb[TCA_IPT_HOOK-1] == NULL ||
+            RTA_PAYLOAD(tb[TCA_IPT_HOOK-1]) < sizeof(u32))
+                return -EINVAL;
+        if (tb[TCA_IPT_TARG-1] == NULL ||
+            RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < sizeof(*t))
+                return -EINVAL;
+        td = (struct ipt_entry_target *)RTA_DATA(tb[TCA_IPT_TARG-1]);
+        if (RTA_PAYLOAD(tb[TCA_IPT_TARG-1]) < td->u.target_size)
+                return -EINVAL;
+
+        if (tb[TCA_IPT_INDEX-1] != NULL &&
+            RTA_PAYLOAD(tb[TCA_IPT_INDEX-1]) >= sizeof(u32))
+                index = *(u32 *)RTA_DATA(tb[TCA_IPT_INDEX-1]);
+
+        p = tcf_hash_check(index, a, ovr, bind);
+        if (p == NULL) {
+                p = tcf_hash_create(index, est, a, sizeof(*p), ovr, bind);
+                if (p == NULL)
+                        return -ENOMEM;
+                ret = ACT_P_CREATED;
+        } else {
+                if (!ovr) {
+                        tcf_ipt_release(p, bind);
+                        return -EEXIST;
+                }
+        }
+
+        hook = *(u32 *)RTA_DATA(tb[TCA_IPT_HOOK-1]);
+
+        err = -ENOMEM;
+        tname = kmalloc(IFNAMSIZ, GFP_KERNEL);
+        if (tname == NULL)
+                goto err1;
+        if (tb[TCA_IPT_TABLE - 1] == NULL ||
+            rtattr_strlcpy(tname, tb[TCA_IPT_TABLE-1], IFNAMSIZ) >= IFNAMSIZ)
+                strcpy(tname, "mangle");
+
+        t = kmalloc(td->u.target_size, GFP_KERNEL);
+        if (t == NULL)
+                goto err2;
+        memcpy(t, td, td->u.target_size);
+
+        if ((err = ipt_init_target(t, tname, hook)) < 0)
+                goto err3;
+
+        spin_lock_bh(&p->lock);
+        if (ret != ACT_P_CREATED) {
+                ipt_destroy_target(p->t);
+                kfree(p->tname);
+                kfree(p->t);
+        }
+        p->tname = tname;
+        p->t     = t;
+        p->hook  = hook;
+        spin_unlock_bh(&p->lock);
+        if (ret == ACT_P_CREATED)
+                tcf_hash_insert(p);
+        return ret;
+
+err3:
+        kfree(t);
+err2:
+        kfree(tname);
+err1:
+        kfree(p);
+        return err;
+}
+
+static int
+tcf_ipt_cleanup(struct tc_action *a, int bind)
+{
+        struct tcf_ipt *p = PRIV(a, ipt);
+        return tcf_ipt_release(p, bind);
+}
+
+static int
+tcf_ipt(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
+{
+        int ret = 0, result = 0;
+        struct tcf_ipt *p = PRIV(a, ipt);
+
+        if (skb_cloned(skb)) {
+                if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC))
+                        return TC_ACT_UNSPEC;
+        }
+
+        spin_lock(&p->lock);
+
+        p->tm.lastuse = jiffies;
+        p->bstats.bytes += skb->len;
+        p->bstats.packets++;
+
+        /* yes, we have to worry about both in and out dev
+         worry later - danger - this API seems to have changed
+         from earlier kernels */
+
+        /* iptables targets take a double skb pointer in case the skb
+         * needs to be replaced. We don't own the skb, so this must not
+         * happen. The pskb_expand_head above should make sure of this */
+        ret = p->t->u.kernel.target->target(&skb, skb->dev, NULL,
+                                            p->hook, p->t->data, NULL);
+        switch (ret) {
+        case NF_ACCEPT:
+                result = TC_ACT_OK;
+                break;
+        case NF_DROP:
+                result = TC_ACT_SHOT;
+                p->qstats.drops++;
+                break;
+        case IPT_CONTINUE:
+                result = TC_ACT_PIPE;
+                break;
+        default:
+                if (net_ratelimit())
+                        printk("Bogus netfilter code %d assume ACCEPT\n", ret);
+                result = TC_POLICE_OK;
+                break;
+        }
+        spin_unlock(&p->lock);
+        return result;
+
+}
+
+static int
+tcf_ipt_dump(struct sk_buff *skb, struct tc_action *a, int bind, int ref)
+{
+        struct ipt_entry_target *t;
+        struct tcf_t tm;
+        struct tc_cnt c;
+        unsigned char *b = skb->tail;
+        struct tcf_ipt *p = PRIV(a, ipt);
+
+        /* for simple targets kernel size == user size
+        ** user name = target name
+        ** for foolproof you need to not assume this
+        */
+
+        t = kmalloc(p->t->u.user.target_size, GFP_ATOMIC);
+        if (t == NULL)
+                goto rtattr_failure;
+
+        c.bindcnt = p->bindcnt - bind;
+        c.refcnt = p->refcnt - ref;
+        memcpy(t, p->t, p->t->u.user.target_size);
+        strcpy(t->u.user.name, p->t->u.kernel.target->name);
+
+        DPRINTK("\ttcf_ipt_dump tablename %s length %d\n", p->tname,
+                strlen(p->tname));
+        DPRINTK("\tdump target name %s size %d size user %d "
+                "data[0] %x data[1] %x\n", p->t->u.kernel.target->name,
+                p->t->u.target_size, p->t->u.user.target_size,
+                p->t->data[0], p->t->data[1]);
+        RTA_PUT(skb, TCA_IPT_TARG, p->t->u.user.target_size, t);
+        RTA_PUT(skb, TCA_IPT_INDEX, 4, &p->index);
+        RTA_PUT(skb, TCA_IPT_HOOK, 4, &p->hook);
+        RTA_PUT(skb, TCA_IPT_CNT, sizeof(struct tc_cnt), &c);
+        RTA_PUT(skb, TCA_IPT_TABLE, IFNAMSIZ, p->tname);
+        tm.install = jiffies_to_clock_t(jiffies - p->tm.install);
+        tm.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
+        tm.expires = jiffies_to_clock_t(p->tm.expires);
+        RTA_PUT(skb, TCA_IPT_TM, sizeof (tm), &tm);
+        kfree(t);
+        return skb->len;
+
+      rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        kfree(t);
+        return -1;
+}
+
+static struct tc_action_ops act_ipt_ops = {
+        .kind           =       "ipt",
+        .type           =       TCA_ACT_IPT,
+        .capab          =       TCA_CAP_NONE,
+        .owner          =       THIS_MODULE,
+        .act            =       tcf_ipt,
+        .dump           =       tcf_ipt_dump,
+        .cleanup        =       tcf_ipt_cleanup,
+        .lookup         =       tcf_hash_search,
+        .init           =       tcf_ipt_init,
+        .walk           =       tcf_generic_walker
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
+MODULE_DESCRIPTION("Iptables target actions");
+MODULE_LICENSE("GPL");
+
+static int __init
+ipt_init_module(void)
+{
+        return tcf_register_action(&act_ipt_ops);
+}
+
+static void __exit
+ipt_cleanup_module(void)
+{
+        tcf_unregister_action(&act_ipt_ops);
+}
+
+module_init(ipt_init_module);
+module_exit(ipt_cleanup_module);