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-rw-r--r--net/sched/act_ipt.c328
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 00000000000..b5001939b74
--- /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);
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-23 19:26:33 +0000