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[/] [or1k/] [trunk/] [linux/] [linux-2.4/] [net/] [sched/] [cls_fw.c] - Rev 1774
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/* * net/sched/cls_fw.c Classifier mapping ipchains' fwmark to traffic class. * * 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: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> * * Changes: * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_walk off by one * Karlis Peisenieks <karlis@mt.lv> : 990415 : fw_delete killed all the filter (and kernel). */ #include <linux/config.h> #include <linux/module.h> #include <asm/uaccess.h> #include <asm/system.h> #include <asm/bitops.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/if_ether.h> #include <linux/inet.h> #include <linux/netdevice.h> #include <linux/etherdevice.h> #include <linux/notifier.h> #include <linux/netfilter.h> #include <net/ip.h> #include <net/route.h> #include <linux/skbuff.h> #include <net/sock.h> #include <net/pkt_sched.h> struct fw_head { struct fw_filter *ht[256]; }; struct fw_filter { struct fw_filter *next; u32 id; struct tcf_result res; #ifdef CONFIG_NET_CLS_POLICE struct tcf_police *police; #endif }; static __inline__ int fw_hash(u32 handle) { return handle&0xFF; } static int fw_classify(struct sk_buff *skb, struct tcf_proto *tp, struct tcf_result *res) { struct fw_head *head = (struct fw_head*)tp->root; struct fw_filter *f; #ifdef CONFIG_NETFILTER u32 id = skb->nfmark; #else u32 id = 0; #endif if (head == NULL) goto old_method; for (f=head->ht[fw_hash(id)]; f; f=f->next) { if (f->id == id) { *res = f->res; #ifdef CONFIG_NET_CLS_POLICE if (f->police) return tcf_police(skb, f->police); #endif return 0; } } return -1; old_method: if (id && (TC_H_MAJ(id) == 0 || !(TC_H_MAJ(id^tp->q->handle)))) { res->classid = id; res->class = 0; return 0; } return -1; } static unsigned long fw_get(struct tcf_proto *tp, u32 handle) { struct fw_head *head = (struct fw_head*)tp->root; struct fw_filter *f; if (head == NULL) return 0; for (f=head->ht[fw_hash(handle)]; f; f=f->next) { if (f->id == handle) return (unsigned long)f; } return 0; } static void fw_put(struct tcf_proto *tp, unsigned long f) { } static int fw_init(struct tcf_proto *tp) { MOD_INC_USE_COUNT; return 0; } static void fw_destroy(struct tcf_proto *tp) { struct fw_head *head = (struct fw_head*)xchg(&tp->root, NULL); struct fw_filter *f; int h; if (head == NULL) { MOD_DEC_USE_COUNT; return; } for (h=0; h<256; h++) { while ((f=head->ht[h]) != NULL) { unsigned long cl; head->ht[h] = f->next; if ((cl = __cls_set_class(&f->res.class, 0)) != 0) tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); #ifdef CONFIG_NET_CLS_POLICE tcf_police_release(f->police); #endif kfree(f); } } kfree(head); MOD_DEC_USE_COUNT; } static int fw_delete(struct tcf_proto *tp, unsigned long arg) { struct fw_head *head = (struct fw_head*)tp->root; struct fw_filter *f = (struct fw_filter*)arg; struct fw_filter **fp; if (head == NULL || f == NULL) return -EINVAL; for (fp=&head->ht[fw_hash(f->id)]; *fp; fp = &(*fp)->next) { if (*fp == f) { unsigned long cl; tcf_tree_lock(tp); *fp = f->next; tcf_tree_unlock(tp); if ((cl = cls_set_class(tp, &f->res.class, 0)) != 0) tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); #ifdef CONFIG_NET_CLS_POLICE tcf_police_release(f->police); #endif kfree(f); return 0; } } return -EINVAL; } static int fw_change(struct tcf_proto *tp, unsigned long base, u32 handle, struct rtattr **tca, unsigned long *arg) { struct fw_head *head = (struct fw_head*)tp->root; struct fw_filter *f; struct rtattr *opt = tca[TCA_OPTIONS-1]; struct rtattr *tb[TCA_FW_MAX]; int err; if (!opt) return handle ? -EINVAL : 0; if (rtattr_parse(tb, TCA_FW_MAX, RTA_DATA(opt), RTA_PAYLOAD(opt)) < 0) return -EINVAL; if ((f = (struct fw_filter*)*arg) != NULL) { /* Node exists: adjust only classid */ if (f->id != handle && handle) return -EINVAL; if (tb[TCA_FW_CLASSID-1]) { unsigned long cl; f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]); cl = tp->q->ops->cl_ops->bind_tcf(tp->q, base, f->res.classid); cl = cls_set_class(tp, &f->res.class, cl); if (cl) tp->q->ops->cl_ops->unbind_tcf(tp->q, cl); } #ifdef CONFIG_NET_CLS_POLICE if (tb[TCA_FW_POLICE-1]) { struct tcf_police *police = tcf_police_locate(tb[TCA_FW_POLICE-1], tca[TCA_RATE-1]); tcf_tree_lock(tp); police = xchg(&f->police, police); tcf_tree_unlock(tp); tcf_police_release(police); } #endif return 0; } if (!handle) return -EINVAL; if (head == NULL) { head = kmalloc(sizeof(struct fw_head), GFP_KERNEL); if (head == NULL) return -ENOBUFS; memset(head, 0, sizeof(*head)); tcf_tree_lock(tp); tp->root = head; tcf_tree_unlock(tp); } f = kmalloc(sizeof(struct fw_filter), GFP_KERNEL); if (f == NULL) return -ENOBUFS; memset(f, 0, sizeof(*f)); f->id = handle; if (tb[TCA_FW_CLASSID-1]) { err = -EINVAL; if (RTA_PAYLOAD(tb[TCA_FW_CLASSID-1]) != 4) goto errout; f->res.classid = *(u32*)RTA_DATA(tb[TCA_FW_CLASSID-1]); cls_set_class(tp, &f->res.class, tp->q->ops->cl_ops->bind_tcf(tp->q, base, f->res.classid)); } #ifdef CONFIG_NET_CLS_POLICE if (tb[TCA_FW_POLICE-1]) f->police = tcf_police_locate(tb[TCA_FW_POLICE-1], tca[TCA_RATE-1]); #endif f->next = head->ht[fw_hash(handle)]; tcf_tree_lock(tp); head->ht[fw_hash(handle)] = f; tcf_tree_unlock(tp); *arg = (unsigned long)f; return 0; errout: if (f) kfree(f); return err; } static void fw_walk(struct tcf_proto *tp, struct tcf_walker *arg) { struct fw_head *head = (struct fw_head*)tp->root; int h; if (head == NULL) arg->stop = 1; if (arg->stop) return; for (h = 0; h < 256; h++) { struct fw_filter *f; for (f = head->ht[h]; f; f = f->next) { if (arg->count < arg->skip) { arg->count++; continue; } if (arg->fn(tp, (unsigned long)f, arg) < 0) { arg->stop = 1; break; } arg->count++; } } } static int fw_dump(struct tcf_proto *tp, unsigned long fh, struct sk_buff *skb, struct tcmsg *t) { struct fw_filter *f = (struct fw_filter*)fh; unsigned char *b = skb->tail; struct rtattr *rta; if (f == NULL) return skb->len; t->tcm_handle = f->id; if (!f->res.classid #ifdef CONFIG_NET_CLS_POLICE && !f->police #endif ) return skb->len; rta = (struct rtattr*)b; RTA_PUT(skb, TCA_OPTIONS, 0, NULL); if (f->res.classid) RTA_PUT(skb, TCA_FW_CLASSID, 4, &f->res.classid); #ifdef CONFIG_NET_CLS_POLICE if (f->police) { struct rtattr * p_rta = (struct rtattr*)skb->tail; RTA_PUT(skb, TCA_FW_POLICE, 0, NULL); if (tcf_police_dump(skb, f->police) < 0) goto rtattr_failure; p_rta->rta_len = skb->tail - (u8*)p_rta; } #endif rta->rta_len = skb->tail - b; #ifdef CONFIG_NET_CLS_POLICE if (f->police) { if (qdisc_copy_stats(skb, &f->police->stats)) goto rtattr_failure; } #endif return skb->len; rtattr_failure: skb_trim(skb, b - skb->data); return -1; } struct tcf_proto_ops cls_fw_ops = { NULL, "fw", fw_classify, fw_init, fw_destroy, fw_get, fw_put, fw_change, fw_delete, fw_walk, fw_dump }; #ifdef MODULE int init_module(void) { return register_tcf_proto_ops(&cls_fw_ops); } void cleanup_module(void) { unregister_tcf_proto_ops(&cls_fw_ops); } #endif MODULE_LICENSE("GPL");
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