401 строка
8.3 KiB
C
401 строка
8.3 KiB
C
/*
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* net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class.
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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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* Changes:
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* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one
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* Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel).
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* Alex <alex@pilotsoft.com> : 2004xxyy: Added Action extension
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*
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* JHS: We should remove the CONFIG_NET_CLS_IND from here
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* eventually when the meta match extension is made available
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*
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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 <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/bitops.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/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/interrupt.h>
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#include <linux/if_ether.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/etherdevice.h>
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#include <linux/notifier.h>
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#include <linux/netfilter.h>
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#include <net/ip.h>
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#include <net/route.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/act_api.h>
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#include <net/pkt_cls.h>
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#define HTSIZE (PAGE_SIZE/sizeof(struct fw_filter *))
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struct fw_head
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{
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struct fw_filter *ht[HTSIZE];
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};
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struct fw_filter
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{
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struct fw_filter *next;
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u32 id;
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struct tcf_result res;
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#ifdef CONFIG_NET_CLS_IND
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char indev[IFNAMSIZ];
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#endif /* CONFIG_NET_CLS_IND */
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struct tcf_exts exts;
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};
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static struct tcf_ext_map fw_ext_map = {
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.action = TCA_FW_ACT,
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.police = TCA_FW_POLICE
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};
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static __inline__ int fw_hash(u32 handle)
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{
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if (HTSIZE == 4096)
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return ((handle >> 24) & 0xFFF) ^
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((handle >> 12) & 0xFFF) ^
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(handle & 0xFFF);
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else if (HTSIZE == 2048)
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return ((handle >> 22) & 0x7FF) ^
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((handle >> 11) & 0x7FF) ^
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(handle & 0x7FF);
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else if (HTSIZE == 1024)
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return ((handle >> 20) & 0x3FF) ^
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((handle >> 10) & 0x3FF) ^
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(handle & 0x3FF);
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else if (HTSIZE == 512)
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return (handle >> 27) ^
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((handle >> 18) & 0x1FF) ^
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((handle >> 9) & 0x1FF) ^
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(handle & 0x1FF);
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else if (HTSIZE == 256) {
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u8 *t = (u8 *) &handle;
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return t[0] ^ t[1] ^ t[2] ^ t[3];
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} else
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return handle & (HTSIZE - 1);
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}
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static int fw_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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struct fw_head *head = (struct fw_head*)tp->root;
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struct fw_filter *f;
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int r;
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#ifdef CONFIG_NETFILTER
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u32 id = skb->nfmark;
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#else
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u32 id = 0;
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#endif
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if (head != NULL) {
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for (f=head->ht[fw_hash(id)]; f; f=f->next) {
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if (f->id == id) {
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*res = f->res;
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#ifdef CONFIG_NET_CLS_IND
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if (!tcf_match_indev(skb, f->indev))
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continue;
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#endif /* CONFIG_NET_CLS_IND */
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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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}
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} else {
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/* old method */
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if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) {
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res->classid = id;
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res->class = 0;
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return 0;
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}
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}
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return -1;
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}
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static unsigned long fw_get(struct tcf_proto *tp, u32 handle)
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{
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struct fw_head *head = (struct fw_head*)tp->root;
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struct fw_filter *f;
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if (head == NULL)
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return 0;
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for (f=head->ht[fw_hash(handle)]; f; f=f->next) {
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if (f->id == handle)
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return (unsigned long)f;
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}
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return 0;
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}
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static void fw_put(struct tcf_proto *tp, unsigned long f)
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{
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}
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static int fw_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
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fw_delete_filter(struct tcf_proto *tp, struct fw_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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kfree(f);
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}
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static void fw_destroy(struct tcf_proto *tp)
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{
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struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL);
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struct fw_filter *f;
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int h;
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if (head == NULL)
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return;
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for (h=0; h<HTSIZE; h++) {
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while ((f=head->ht[h]) != NULL) {
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head->ht[h] = f->next;
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fw_delete_filter(tp, f);
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}
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}
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kfree(head);
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}
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static int fw_delete(struct tcf_proto *tp, unsigned long arg)
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{
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struct fw_head *head = (struct fw_head*)tp->root;
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struct fw_filter *f = (struct fw_filter*)arg;
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struct fw_filter **fp;
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if (head == NULL || f == NULL)
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goto out;
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for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) {
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if (*fp == f) {
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tcf_tree_lock(tp);
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*fp = f->next;
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tcf_tree_unlock(tp);
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fw_delete_filter(tp, f);
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return 0;
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}
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}
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out:
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return -EINVAL;
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}
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static int
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fw_change_attrs(struct tcf_proto *tp, struct fw_filter *f,
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struct rtattr **tb, struct rtattr **tca, unsigned long base)
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{
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struct tcf_exts e;
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int err;
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err = tcf_exts_validate(tp, tb, tca[TCA_RATE-1], &e, &fw_ext_map);
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if (err < 0)
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return err;
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err = -EINVAL;
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if (tb[TCA_FW_CLASSID-1]) {
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if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != sizeof(u32))
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goto errout;
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f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]);
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tcf_bind_filter(tp, &f->res, base);
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}
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#ifdef CONFIG_NET_CLS_IND
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if (tb[TCA_FW_INDEV-1]) {
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err = tcf_change_indev(tp, f->indev, tb[TCA_FW_INDEV-1]);
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if (err < 0)
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goto errout;
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}
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#endif /* CONFIG_NET_CLS_IND */
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tcf_exts_change(tp, &f->exts, &e);
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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 fw_change(struct tcf_proto *tp, unsigned long base,
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u32 handle,
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struct rtattr **tca,
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unsigned long *arg)
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{
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struct fw_head *head = (struct fw_head*)tp->root;
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struct fw_filter *f = (struct fw_filter *) *arg;
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struct rtattr *opt = tca[TCA_OPTIONS-1];
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struct rtattr *tb[TCA_FW_MAX];
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int err;
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if (!opt)
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return handle ? -EINVAL : 0;
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if (rtattr_parse_nested(tb, TCA_FW_MAX, opt) < 0)
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return -EINVAL;
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if (f != NULL) {
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if (f->id != handle && handle)
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return -EINVAL;
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return fw_change_attrs(tp, f, tb, tca, base);
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}
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if (!handle)
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return -EINVAL;
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if (head == NULL) {
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head = kmalloc(sizeof(struct fw_head), GFP_KERNEL);
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if (head == NULL)
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return -ENOBUFS;
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memset(head, 0, sizeof(*head));
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tcf_tree_lock(tp);
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tp->root = head;
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tcf_tree_unlock(tp);
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}
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f = kmalloc(sizeof(struct fw_filter), GFP_KERNEL);
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if (f == NULL)
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return -ENOBUFS;
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memset(f, 0, sizeof(*f));
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f->id = handle;
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err = fw_change_attrs(tp, f, tb, tca, base);
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if (err < 0)
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goto errout;
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f->next = head->ht[fw_hash(handle)];
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tcf_tree_lock(tp);
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head->ht[fw_hash(handle)] = f;
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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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kfree(f);
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return err;
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}
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static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg)
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{
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struct fw_head *head = (struct fw_head*)tp->root;
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int h;
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if (head == NULL)
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arg->stop = 1;
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if (arg->stop)
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return;
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for (h = 0; h < HTSIZE; h++) {
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struct fw_filter *f;
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for (f = head->ht[h]; f; f = f->next) {
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if (arg->count < arg->skip) {
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arg->count++;
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continue;
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}
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if (arg->fn(tp, (unsigned long)f, arg) < 0) {
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arg->stop = 1;
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return;
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}
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arg->count++;
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}
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}
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}
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static int fw_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 fw_filter *f = (struct fw_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->id;
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if (!f->res.classid && !tcf_exts_is_available(&f->exts))
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return skb->len;
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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_FW_CLASSID, 4, &f->res.classid);
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#ifdef CONFIG_NET_CLS_IND
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if (strlen(f->indev))
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RTA_PUT(skb, TCA_FW_INDEV, IFNAMSIZ, f->indev);
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#endif /* CONFIG_NET_CLS_IND */
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if (tcf_exts_dump(skb, &f->exts, &fw_ext_map) < 0)
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goto rtattr_failure;
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rta->rta_len = skb->tail - b;
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if (tcf_exts_dump_stats(skb, &f->exts, &fw_ext_map) < 0)
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goto rtattr_failure;
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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_fw_ops = {
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.next = NULL,
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.kind = "fw",
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.classify = fw_classify,
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.init = fw_init,
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.destroy = fw_destroy,
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.get = fw_get,
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.put = fw_put,
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.change = fw_change,
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.delete = fw_delete,
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.walk = fw_walk,
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.dump = fw_dump,
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.owner = THIS_MODULE,
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};
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static int __init init_fw(void)
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{
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return register_tcf_proto_ops(&cls_fw_ops);
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}
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static void __exit exit_fw(void)
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{
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unregister_tcf_proto_ops(&cls_fw_ops);
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}
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module_init(init_fw)
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module_exit(exit_fw)
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MODULE_LICENSE("GPL");
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