--- /dev/null
+/*
+ * net/sched/act_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 <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/skbuff.h>
+#include <linux/rtnetlink.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <net/netlink.h>
+#include <net/pkt_sched.h>
+#include <linux/tc_act/tc_pedit.h>
+#include <net/tc_act/tc_pedit.h>
+
+#define PEDIT_TAB_MASK 15
+
+static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = {
+ [TCA_PEDIT_PARMS] = { .len = sizeof(struct tc_pedit) },
+};
+
+static int tcf_pedit_init(struct net *net, struct nlattr *nla,
+ struct nlattr *est, struct tc_action *a,
+ int ovr, int bind)
+{
+ struct nlattr *tb[TCA_PEDIT_MAX + 1];
+ struct tc_pedit *parm;
+ int ret = 0, err;
+ struct tcf_pedit *p;
+ struct tc_pedit_key *keys = NULL;
+ int ksize;
+
+ if (nla == NULL)
+ return -EINVAL;
+
+ err = nla_parse_nested(tb, TCA_PEDIT_MAX, nla, pedit_policy);
+ if (err < 0)
+ return err;
+
+ if (tb[TCA_PEDIT_PARMS] == NULL)
+ return -EINVAL;
+ parm = nla_data(tb[TCA_PEDIT_PARMS]);
+ ksize = parm->nkeys * sizeof(struct tc_pedit_key);
+ if (nla_len(tb[TCA_PEDIT_PARMS]) < sizeof(*parm) + ksize)
+ return -EINVAL;
+
+ if (!tcf_hash_check(parm->index, a, bind)) {
+ if (!parm->nkeys)
+ return -EINVAL;
+ ret = tcf_hash_create(parm->index, est, a, sizeof(*p), bind);
+ if (ret)
+ return ret;
+ p = to_pedit(a);
+ keys = kmalloc(ksize, GFP_KERNEL);
+ if (keys == NULL) {
+ tcf_hash_cleanup(a, est);
+ return -ENOMEM;
+ }
+ ret = ACT_P_CREATED;
+ } else {
+ p = to_pedit(a);
+ tcf_hash_release(a, bind);
+ if (bind)
+ return 0;
+ if (!ovr)
+ return -EEXIST;
+
+ if (p->tcfp_nkeys && p->tcfp_nkeys != parm->nkeys) {
+ keys = kmalloc(ksize, GFP_KERNEL);
+ if (keys == NULL)
+ return -ENOMEM;
+ }
+ }
+
+ spin_lock_bh(&p->tcf_lock);
+ p->tcfp_flags = parm->flags;
+ p->tcf_action = parm->action;
+ if (keys) {
+ kfree(p->tcfp_keys);
+ p->tcfp_keys = keys;
+ p->tcfp_nkeys = parm->nkeys;
+ }
+ memcpy(p->tcfp_keys, parm->keys, ksize);
+ spin_unlock_bh(&p->tcf_lock);
+ if (ret == ACT_P_CREATED)
+ tcf_hash_insert(a);
+ return ret;
+}
+
+static void tcf_pedit_cleanup(struct tc_action *a, int bind)
+{
+ struct tcf_pedit *p = a->priv;
+ struct tc_pedit_key *keys = p->tcfp_keys;
+ kfree(keys);
+}
+
+static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a,
+ struct tcf_result *res)
+{
+ struct tcf_pedit *p = a->priv;
+ int i, munged = 0;
+ unsigned int off;
+
+ if (skb_unclone(skb, GFP_ATOMIC))
+ return p->tcf_action;
+
+ off = skb_network_offset(skb);
+
+ spin_lock(&p->tcf_lock);
+
+ p->tcf_tm.lastuse = jiffies;
+
+ if (p->tcfp_nkeys > 0) {
+ struct tc_pedit_key *tkey = p->tcfp_keys;
+
+ for (i = p->tcfp_nkeys; i > 0; i--, tkey++) {
+ u32 *ptr, _data;
+ int offset = tkey->off;
+
+ if (tkey->offmask) {
+ char *d, _d;
+
+ d = skb_header_pointer(skb, off + tkey->at, 1,
+ &_d);
+ if (!d)
+ goto bad;
+ offset += (*d & tkey->offmask) >> tkey->shift;
+ }
+
+ if (offset % 4) {
+ pr_info("tc filter pedit"
+ " offset must be on 32 bit boundaries\n");
+ goto bad;
+ }
+ if (offset > 0 && offset > skb->len) {
+ pr_info("tc filter pedit"
+ " offset %d can't exceed pkt length %d\n",
+ offset, skb->len);
+ goto bad;
+ }
+
+ ptr = skb_header_pointer(skb, off + offset, 4, &_data);
+ if (!ptr)
+ goto bad;
+ /* just do it, baby */
+ *ptr = ((*ptr & tkey->mask) ^ tkey->val);
+ if (ptr == &_data)
+ skb_store_bits(skb, off + offset, ptr, 4);
+ munged++;
+ }
+
+ if (munged)
+ skb->tc_verd = SET_TC_MUNGED(skb->tc_verd);
+ goto done;
+ } else
+ WARN(1, "pedit BUG: index %d\n", p->tcf_index);
+
+bad:
+ p->tcf_qstats.overlimits++;
+done:
+ bstats_update(&p->tcf_bstats, skb);
+ spin_unlock(&p->tcf_lock);
+ return p->tcf_action;
+}
+
+static int tcf_pedit_dump(struct sk_buff *skb, struct tc_action *a,
+ int bind, int ref)
+{
+ unsigned char *b = skb_tail_pointer(skb);
+ struct tcf_pedit *p = a->priv;
+ struct tc_pedit *opt;
+ struct tcf_t t;
+ int s;
+
+ s = sizeof(*opt) + p->tcfp_nkeys * sizeof(struct tc_pedit_key);
+
+ /* netlink spinlocks held above us - must use ATOMIC */
+ opt = kzalloc(s, GFP_ATOMIC);
+ if (unlikely(!opt))
+ return -ENOBUFS;
+
+ memcpy(opt->keys, p->tcfp_keys,
+ p->tcfp_nkeys * sizeof(struct tc_pedit_key));
+ opt->index = p->tcf_index;
+ opt->nkeys = p->tcfp_nkeys;
+ opt->flags = p->tcfp_flags;
+ opt->action = p->tcf_action;
+ opt->refcnt = p->tcf_refcnt - ref;
+ opt->bindcnt = p->tcf_bindcnt - bind;
+
+ if (nla_put(skb, TCA_PEDIT_PARMS, s, opt))
+ goto nla_put_failure;
+ t.install = jiffies_to_clock_t(jiffies - p->tcf_tm.install);
+ t.lastuse = jiffies_to_clock_t(jiffies - p->tcf_tm.lastuse);
+ t.expires = jiffies_to_clock_t(p->tcf_tm.expires);
+ if (nla_put(skb, TCA_PEDIT_TM, sizeof(t), &t))
+ goto nla_put_failure;
+ kfree(opt);
+ return skb->len;
+
+nla_put_failure:
+ nlmsg_trim(skb, b);
+ kfree(opt);
+ return -1;
+}
+
+static struct tc_action_ops act_pedit_ops = {
+ .kind = "pedit",
+ .type = TCA_ACT_PEDIT,
+ .owner = THIS_MODULE,
+ .act = tcf_pedit,
+ .dump = tcf_pedit_dump,
+ .cleanup = tcf_pedit_cleanup,
+ .init = tcf_pedit_init,
+};
+
+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, PEDIT_TAB_MASK);
+}
+
+static void __exit pedit_cleanup_module(void)
+{
+ tcf_unregister_action(&act_pedit_ops);
+}
+
+module_init(pedit_init_module);
+module_exit(pedit_cleanup_module);
+
Code Review / kvmfornfv.git / blobdiff