307 lines
6.4 KiB
C
307 lines
6.4 KiB
C
/*
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* net/sched/cls_basic.c Basic Packet Classifier.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Thomas Graf <tgraf@suug.ch>
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*/
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/errno.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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struct basic_head
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{
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u32 hgenerator;
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struct list_head flist;
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};
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struct basic_filter
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{
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u32 handle;
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struct tcf_exts exts;
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struct tcf_ematch_tree ematches;
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struct tcf_result res;
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struct list_head link;
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};
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static struct tcf_ext_map basic_ext_map = {
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.action = TCA_BASIC_ACT,
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.police = TCA_BASIC_POLICE
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};
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static int basic_classify(struct sk_buff *skb, struct tcf_proto *tp,
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struct tcf_result *res)
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{
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int r;
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struct basic_head *head = (struct basic_head *) tp->root;
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struct basic_filter *f;
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list_for_each_entry(f, &head->flist, link) {
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if (!tcf_em_tree_match(skb, &f->ematches, NULL))
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continue;
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*res = f->res;
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r = tcf_exts_exec(skb, &f->exts, res);
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if (r < 0)
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continue;
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return r;
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}
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return -1;
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}
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static unsigned long basic_get(struct tcf_proto *tp, u32 handle)
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{
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unsigned long l = 0UL;
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struct basic_head *head = (struct basic_head *) tp->root;
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struct basic_filter *f;
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if (head == NULL)
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return 0UL;
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list_for_each_entry(f, &head->flist, link)
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if (f->handle == handle)
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l = (unsigned long) f;
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return l;
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}
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static void basic_put(struct tcf_proto *tp, unsigned long f)
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{
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}
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static int basic_init(struct tcf_proto *tp)
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{
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return 0;
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}
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static inline void basic_delete_filter(struct tcf_proto *tp,
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struct basic_filter *f)
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{
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_destroy(tp, &f->exts);
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tcf_em_tree_destroy(tp, &f->ematches);
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kfree(f);
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}
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static void basic_destroy(struct tcf_proto *tp)
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{
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struct basic_head *head = (struct basic_head *) xchg(&tp->root, NULL);
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struct basic_filter *f, *n;
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list_for_each_entry_safe(f, n, &head->flist, link) {
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list_del(&f->link);
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basic_delete_filter(tp, f);
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}
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}
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static int basic_delete(struct tcf_proto *tp, unsigned long arg)
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{
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struct basic_head *head = (struct basic_head *) tp->root;
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struct basic_filter *t, *f = (struct basic_filter *) arg;
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list_for_each_entry(t, &head->flist, link)
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if (t == f) {
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tcf_tree_lock(tp);
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list_del(&t->link);
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tcf_tree_unlock(tp);
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basic_delete_filter(tp, t);
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return 0;
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}
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return -ENOENT;
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}
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static inline int basic_set_parms(struct tcf_proto *tp, struct basic_filter *f,
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unsigned long base, struct rtattr **tb,
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struct rtattr *est)
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{
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int err = -EINVAL;
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struct tcf_exts e;
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struct tcf_ematch_tree t;
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if (tb[TCA_BASIC_CLASSID-1])
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if (RTA_PAYLOAD(tb[TCA_BASIC_CLASSID-1]) < sizeof(u32))
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return err;
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err = tcf_exts_validate(tp, tb, est, &e, &basic_ext_map);
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if (err < 0)
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return err;
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err = tcf_em_tree_validate(tp, tb[TCA_BASIC_EMATCHES-1], &t);
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if (err < 0)
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goto errout;
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if (tb[TCA_BASIC_CLASSID-1]) {
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f->res.classid = *(u32*)RTA_DATA(tb[TCA_BASIC_CLASSID-1]);
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tcf_bind_filter(tp, &f->res, base);
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}
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tcf_exts_change(tp, &f->exts, &e);
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tcf_em_tree_change(tp, &f->ematches, &t);
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return 0;
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errout:
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tcf_exts_destroy(tp, &e);
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return err;
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}
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static int basic_change(struct tcf_proto *tp, unsigned long base, u32 handle,
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struct rtattr **tca, unsigned long *arg)
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{
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int err = -EINVAL;
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struct basic_head *head = (struct basic_head *) tp->root;
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struct rtattr *tb[TCA_BASIC_MAX];
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struct basic_filter *f = (struct basic_filter *) *arg;
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if (tca[TCA_OPTIONS-1] == NULL)
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return -EINVAL;
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if (rtattr_parse_nested(tb, TCA_BASIC_MAX, tca[TCA_OPTIONS-1]) < 0)
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return -EINVAL;
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if (f != NULL) {
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if (handle && f->handle != handle)
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return -EINVAL;
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return basic_set_parms(tp, f, base, tb, tca[TCA_RATE-1]);
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}
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err = -ENOBUFS;
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if (head == NULL) {
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head = kmalloc(sizeof(*head), GFP_KERNEL);
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if (head == NULL)
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goto errout;
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memset(head, 0, sizeof(*head));
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INIT_LIST_HEAD(&head->flist);
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tp->root = head;
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}
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f = kmalloc(sizeof(*f), GFP_KERNEL);
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if (f == NULL)
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goto errout;
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memset(f, 0, sizeof(*f));
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err = -EINVAL;
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if (handle)
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f->handle = handle;
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else {
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int i = 0x80000000;
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do {
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if (++head->hgenerator == 0x7FFFFFFF)
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head->hgenerator = 1;
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} while (--i > 0 && basic_get(tp, head->hgenerator));
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if (i <= 0) {
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printk(KERN_ERR "Insufficient number of handles\n");
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goto errout;
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}
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f->handle = head->hgenerator;
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}
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err = basic_set_parms(tp, f, base, tb, tca[TCA_RATE-1]);
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if (err < 0)
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goto errout;
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tcf_tree_lock(tp);
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list_add(&f->link, &head->flist);
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tcf_tree_unlock(tp);
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*arg = (unsigned long) f;
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return 0;
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errout:
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if (*arg == 0UL && f)
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kfree(f);
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return err;
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}
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static void basic_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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{
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struct basic_head *head = (struct basic_head *) tp->root;
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struct basic_filter *f;
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list_for_each_entry(f, &head->flist, link) {
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if (arg->count < arg->skip)
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goto skip;
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if (arg->fn(tp, (unsigned long) f, arg) < 0) {
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arg->stop = 1;
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break;
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}
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skip:
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arg->count++;
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}
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}
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static int basic_dump(struct tcf_proto *tp, unsigned long fh,
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struct sk_buff *skb, struct tcmsg *t)
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{
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struct basic_filter *f = (struct basic_filter *) fh;
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unsigned char *b = skb->tail;
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struct rtattr *rta;
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if (f == NULL)
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return skb->len;
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t->tcm_handle = f->handle;
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rta = (struct rtattr *) b;
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RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
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if (f->res.classid)
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RTA_PUT(skb, TCA_BASIC_CLASSID, sizeof(u32), &f->res.classid);
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if (tcf_exts_dump(skb, &f->exts, &basic_ext_map) < 0 ||
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tcf_em_tree_dump(skb, &f->ematches, TCA_BASIC_EMATCHES) < 0)
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goto rtattr_failure;
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rta->rta_len = (skb->tail - b);
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return skb->len;
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rtattr_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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}
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static struct tcf_proto_ops cls_basic_ops = {
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.kind = "basic",
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.classify = basic_classify,
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.init = basic_init,
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.destroy = basic_destroy,
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.get = basic_get,
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.put = basic_put,
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.change = basic_change,
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.delete = basic_delete,
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.walk = basic_walk,
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.dump = basic_dump,
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.owner = THIS_MODULE,
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};
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static int __init init_basic(void)
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{
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return register_tcf_proto_ops(&cls_basic_ops);
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}
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static void __exit exit_basic(void)
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{
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unregister_tcf_proto_ops(&cls_basic_ops);
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}
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module_init(init_basic)
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module_exit(exit_basic)
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MODULE_LICENSE("GPL");
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