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-rw-r--r--net/sched/act_pedit.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c
new file mode 100644
index 000000000000..1742a68e0122
--- /dev/null
+++ b/net/sched/act_pedit.c
@@ -0,0 +1,289 @@
+/*
+ * net/sched/pedit.c Generic packet editor
+ *
+ * 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.
+ *
+ * Authors: 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 <net/sock.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_pedit.h>
+
+
+#define PEDIT_DEB 1
+
+/* use generic hash table */
+#define MY_TAB_SIZE 16
+#define MY_TAB_MASK 15
+static u32 idx_gen;
+static struct tcf_pedit *tcf_pedit_ht[MY_TAB_SIZE];
+static DEFINE_RWLOCK(pedit_lock);
+
+#define tcf_st tcf_pedit
+#define tc_st tc_pedit
+#define tcf_t_lock pedit_lock
+#define tcf_ht tcf_pedit_ht
+
+#define CONFIG_NET_ACT_INIT 1
+#include <net/pkt_act.h>
+
+static int
+tcf_pedit_init(struct rtattr *rta, struct rtattr *est, struct tc_action *a,
+ int ovr, int bind)
+{
+ struct rtattr *tb[TCA_PEDIT_MAX];
+ struct tc_pedit *parm;
+ int ret = 0;
+ struct tcf_pedit *p;
+ struct tc_pedit_key *keys = NULL;
+ int ksize;
+
+ if (rta == NULL || rtattr_parse_nested(tb, TCA_PEDIT_MAX, rta) < 0)
+ return -EINVAL;
+
+ if (tb[TCA_PEDIT_PARMS - 1] == NULL ||
+ RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm))
+ return -EINVAL;
+ parm = RTA_DATA(tb[TCA_PEDIT_PARMS-1]);
+ ksize = parm->nkeys * sizeof(struct tc_pedit_key);
+ if (RTA_PAYLOAD(tb[TCA_PEDIT_PARMS-1]) < sizeof(*parm) + ksize)
+ return -EINVAL;
+
+ p = tcf_hash_check(parm->index, a, ovr, bind);
+ if (p == NULL) {
+ if (!parm->nkeys)
+ return -EINVAL;
+ p = tcf_hash_create(parm->index, est, a, sizeof(*p), ovr, bind);
+ if (p == NULL)
+ return -ENOMEM;
+ keys = kmalloc(ksize, GFP_KERNEL);
+ if (keys == NULL) {
+ kfree(p);
+ return -ENOMEM;
+ }
+ ret = ACT_P_CREATED;
+ } else {
+ if (!ovr) {
+ tcf_hash_release(p, bind);
+ return -EEXIST;
+ }
+ if (p->nkeys && p->nkeys != parm->nkeys) {
+ keys = kmalloc(ksize, GFP_KERNEL);
+ if (keys == NULL)
+ return -ENOMEM;
+ }
+ }
+
+ spin_lock_bh(&p->lock);
+ p->flags = parm->flags;
+ p->action = parm->action;
+ if (keys) {
+ kfree(p->keys);
+ p->keys = keys;
+ p->nkeys = parm->nkeys;
+ }
+ memcpy(p->keys, parm->keys, ksize);
+ spin_unlock_bh(&p->lock);
+ if (ret == ACT_P_CREATED)
+ tcf_hash_insert(p);
+ return ret;
+}
+
+static int
+tcf_pedit_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_pedit *p = PRIV(a, pedit);
+
+ if (p != NULL) {
+ struct tc_pedit_key *keys = p->keys;
+ if (tcf_hash_release(p, bind)) {
+ kfree(keys);
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static int
+tcf_pedit(struct sk_buff *skb, struct tc_action *a, struct tcf_result *res)
+{
+ struct tcf_pedit *p = PRIV(a, pedit);
+ int i, munged = 0;
+ u8 *pptr;
+
+ if (!(skb->tc_verd & TC_OK2MUNGE)) {
+ /* should we set skb->cloned? */
+ if (pskb_expand_head(skb, 0, 0, GFP_ATOMIC)) {
+ return p->action;
+ }
+ }
+
+ pptr = skb->nh.raw;
+
+ spin_lock(&p->lock);
+
+ p->tm.lastuse = jiffies;
+
+ if (p->nkeys > 0) {
+ struct tc_pedit_key *tkey = p->keys;
+
+ for (i = p->nkeys; i > 0; i--, tkey++) {
+ u32 *ptr;
+ int offset = tkey->off;
+
+ if (tkey->offmask) {
+ if (skb->len > tkey->at) {
+ char *j = pptr + tkey->at;
+ offset += ((*j & tkey->offmask) >>
+ tkey->shift);
+ } else {
+ goto bad;
+ }
+ }
+
+ if (offset % 4) {
+ printk("offset must be on 32 bit boundaries\n");
+ goto bad;
+ }
+ if (skb->len < 0 || (offset > 0 && offset > skb->len)) {
+ printk("offset %d cant exceed pkt length %d\n",
+ offset, skb->len);
+ goto bad;
+ }
+
+ ptr = (u32 *)(pptr+offset);
+ /* just do it, baby */
+ *ptr = ((*ptr & tkey->mask) ^ tkey->val);
+ munged++;
+ }
+
+ if (munged)
+ skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
+ goto done;
+ } else {
+ printk("pedit BUG: index %d\n",p->index);
+ }
+
+bad:
+ p->qstats.overlimits++;
+done:
+ p->bstats.bytes += skb->len;
+ p->bstats.packets++;
+ spin_unlock(&p->lock);
+ return p->action;
+}
+
+static int
+tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,int bind, int ref)
+{
+ unsigned char *b = skb->tail;
+ struct tc_pedit *opt;
+ struct tcf_pedit *p = PRIV(a, pedit);
+ struct tcf_t t;
+ int s;
+
+ s = sizeof(*opt) + p->nkeys * sizeof(struct tc_pedit_key);
+
+ /* netlink spinlocks held above us - must use ATOMIC */
+ opt = kmalloc(s, GFP_ATOMIC);
+ if (opt == NULL)
+ return -ENOBUFS;
+ memset(opt, 0, s);
+
+ memcpy(opt->keys, p->keys, p->nkeys * sizeof(struct tc_pedit_key));
+ opt->index = p->index;
+ opt->nkeys = p->nkeys;
+ opt->flags = p->flags;
+ opt->action = p->action;
+ opt->refcnt = p->refcnt - ref;
+ opt->bindcnt = p->bindcnt - bind;
+
+
+#ifdef PEDIT_DEB
+ {
+ /* Debug - get rid of later */
+ int i;
+ struct tc_pedit_key *key = opt->keys;
+
+ for (i=0; i<opt->nkeys; i++, key++) {
+ printk( "\n key #%d",i);
+ printk( " at %d: val %08x mask %08x",
+ (unsigned int)key->off,
+ (unsigned int)key->val,
+ (unsigned int)key->mask);
+ }
+ }
+#endif
+
+ RTA_PUT(skb, TCA_PEDIT_PARMS, s, opt);
+ t.install = jiffies_to_clock_t(jiffies - p->tm.install);
+ t.lastuse = jiffies_to_clock_t(jiffies - p->tm.lastuse);
+ t.expires = jiffies_to_clock_t(p->tm.expires);
+ RTA_PUT(skb, TCA_PEDIT_TM, sizeof(t), &t);
+ kfree(opt);
+ return skb->len;
+
+rtattr_failure:
+ skb_trim(skb, b - skb->data);
+ kfree(opt);
+ return -1;
+}
+
+static
+struct tc_action_ops act_pedit_ops = {
+ .kind = "pedit",
+ .type = TCA_ACT_PEDIT,
+ .capab = TCA_CAP_NONE,
+ .owner = THIS_MODULE,
+ .act = tcf_pedit,
+ .dump = tcf_pedit_dump,
+ .cleanup = tcf_pedit_cleanup,
+ .lookup = tcf_hash_search,
+ .init = tcf_pedit_init,
+ .walk = tcf_generic_walker
+};
+
+MODULE_AUTHOR("Jamal Hadi Salim(2002-4)");
+MODULE_DESCRIPTION("Generic Packet Editor actions");
+MODULE_LICENSE("GPL");
+
+static int __init
+pedit_init_module(void)
+{
+ return tcf_register_action(&act_pedit_ops);
+}
+
+static void __exit
+pedit_cleanup_module(void)
+{
+ tcf_unregister_action(&act_pedit_ops);
+}
+
+module_init(pedit_init_module);
+module_exit(pedit_cleanup_module);
+