1 files changed, 288 insertions, 0 deletions

diff --git a/net/sched/pedit.c b/net/sched/pedit.c
new file mode 100644
index 000000000000..678be6a645fb
--- /dev/null
+++ b/net/sched/pedit.c
@@ -0,0 +1,288 @@
+/*
+ * 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 **pskb, struct tc_action *a)
+{
+        struct tcf_pedit *p = PRIV(a, pedit);
+        struct sk_buff *skb = *pskb;
+        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);
+        return skb->len;
+
+rtattr_failure:
+        skb_trim(skb, b - skb->data);
+        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);
+