436 lines
9.6 KiB
C
436 lines
9.6 KiB
C
/* net/sched/sch_ingress.c - Ingress qdisc
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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: Jamal Hadi Salim 1999
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/netfilter.h>
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#include <linux/smp.h>
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#include <net/pkt_sched.h>
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#include <asm/byteorder.h>
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#include <asm/uaccess.h>
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#include <linux/kmod.h>
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#include <linux/stat.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#undef DEBUG_INGRESS
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#ifdef DEBUG_INGRESS /* control */
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#define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define DPRINTK(format,args...)
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#endif
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#if 0 /* data */
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#define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
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#else
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#define D2PRINTK(format,args...)
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#endif
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#define PRIV(sch) qdisc_priv(sch)
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/* Thanks to Doron Oz for this hack
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*/
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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static int nf_registered;
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#endif
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#endif
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struct ingress_qdisc_data {
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struct Qdisc *q;
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struct tcf_proto *filter_list;
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};
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/* ------------------------- Class/flow operations ------------------------- */
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static int ingress_graft(struct Qdisc *sch,unsigned long arg,
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struct Qdisc *new,struct Qdisc **old)
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{
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#ifdef DEBUG_INGRESS
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struct ingress_qdisc_data *p = PRIV(sch);
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#endif
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DPRINTK("ingress_graft(sch %p,[qdisc %p],new %p,old %p)\n",
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sch, p, new, old);
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DPRINTK("\n ingress_graft: You cannot add qdiscs to classes");
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return 1;
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}
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static struct Qdisc *ingress_leaf(struct Qdisc *sch, unsigned long arg)
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{
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return NULL;
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}
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static unsigned long ingress_get(struct Qdisc *sch,u32 classid)
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{
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#ifdef DEBUG_INGRESS
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struct ingress_qdisc_data *p = PRIV(sch);
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#endif
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DPRINTK("ingress_get(sch %p,[qdisc %p],classid %x)\n", sch, p, classid);
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return TC_H_MIN(classid) + 1;
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}
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static unsigned long ingress_bind_filter(struct Qdisc *sch,
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unsigned long parent, u32 classid)
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{
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return ingress_get(sch, classid);
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}
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static void ingress_put(struct Qdisc *sch, unsigned long cl)
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{
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}
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static int ingress_change(struct Qdisc *sch, u32 classid, u32 parent,
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struct rtattr **tca, unsigned long *arg)
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{
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#ifdef DEBUG_INGRESS
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struct ingress_qdisc_data *p = PRIV(sch);
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#endif
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DPRINTK("ingress_change(sch %p,[qdisc %p],classid %x,parent %x),"
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"arg 0x%lx\n", sch, p, classid, parent, *arg);
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DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
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return 0;
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}
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static void ingress_walk(struct Qdisc *sch,struct qdisc_walker *walker)
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{
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#ifdef DEBUG_INGRESS
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struct ingress_qdisc_data *p = PRIV(sch);
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#endif
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DPRINTK("ingress_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
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DPRINTK("No effect. sch_ingress doesn't maintain classes at the moment");
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}
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static struct tcf_proto **ingress_find_tcf(struct Qdisc *sch,unsigned long cl)
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{
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struct ingress_qdisc_data *p = PRIV(sch);
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return &p->filter_list;
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}
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/* --------------------------- Qdisc operations ---------------------------- */
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static int ingress_enqueue(struct sk_buff *skb,struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = PRIV(sch);
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struct tcf_result res;
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int result;
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D2PRINTK("ingress_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
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result = tc_classify(skb, p->filter_list, &res);
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D2PRINTK("result %d class 0x%04x\n", result, res.classid);
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/*
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* Unlike normal "enqueue" functions, ingress_enqueue returns a
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* firewall FW_* code.
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*/
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#ifdef CONFIG_NET_CLS_ACT
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sch->bstats.packets++;
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sch->bstats.bytes += skb->len;
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switch (result) {
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case TC_ACT_SHOT:
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result = TC_ACT_SHOT;
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sch->qstats.drops++;
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break;
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case TC_ACT_STOLEN:
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case TC_ACT_QUEUED:
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result = TC_ACT_STOLEN;
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break;
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case TC_ACT_RECLASSIFY:
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case TC_ACT_OK:
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case TC_ACT_UNSPEC:
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default:
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skb->tc_index = TC_H_MIN(res.classid);
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result = TC_ACT_OK;
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break;
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};
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/* backward compat */
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#else
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#ifdef CONFIG_NET_CLS_POLICE
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switch (result) {
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case TC_POLICE_SHOT:
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result = NF_DROP;
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sch->qstats.drops++;
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break;
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case TC_POLICE_RECLASSIFY: /* DSCP remarking here ? */
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case TC_POLICE_OK:
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case TC_POLICE_UNSPEC:
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default:
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sch->bstats.packets++;
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sch->bstats.bytes += skb->len;
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result = NF_ACCEPT;
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break;
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};
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#else
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D2PRINTK("Overriding result to ACCEPT\n");
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result = NF_ACCEPT;
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sch->bstats.packets++;
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sch->bstats.bytes += skb->len;
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#endif
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#endif
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return result;
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}
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static struct sk_buff *ingress_dequeue(struct Qdisc *sch)
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{
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/*
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struct ingress_qdisc_data *p = PRIV(sch);
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D2PRINTK("ingress_dequeue(sch %p,[qdisc %p])\n",sch,PRIV(p));
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*/
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return NULL;
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}
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static int ingress_requeue(struct sk_buff *skb,struct Qdisc *sch)
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{
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/*
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struct ingress_qdisc_data *p = PRIV(sch);
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D2PRINTK("ingress_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,PRIV(p));
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*/
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return 0;
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}
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static unsigned int ingress_drop(struct Qdisc *sch)
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{
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#ifdef DEBUG_INGRESS
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struct ingress_qdisc_data *p = PRIV(sch);
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#endif
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DPRINTK("ingress_drop(sch %p,[qdisc %p])\n", sch, p);
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return 0;
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}
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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static unsigned int
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ing_hook(unsigned int hook, struct sk_buff **pskb,
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const struct net_device *indev,
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const struct net_device *outdev,
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int (*okfn)(struct sk_buff *))
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{
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struct Qdisc *q;
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struct sk_buff *skb = *pskb;
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struct net_device *dev = skb->dev;
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int fwres=NF_ACCEPT;
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DPRINTK("ing_hook: skb %s dev=%s len=%u\n",
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skb->sk ? "(owned)" : "(unowned)",
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skb->dev ? (*pskb)->dev->name : "(no dev)",
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skb->len);
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/*
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revisit later: Use a private since lock dev->queue_lock is also
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used on the egress (might slow things for an iota)
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*/
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if (dev->qdisc_ingress) {
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spin_lock(&dev->queue_lock);
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if ((q = dev->qdisc_ingress) != NULL)
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fwres = q->enqueue(skb, q);
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spin_unlock(&dev->queue_lock);
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}
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return fwres;
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}
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/* after ipt_filter */
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static struct nf_hook_ops ing_ops = {
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.hook = ing_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET,
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.hooknum = NF_IP_PRE_ROUTING,
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.priority = NF_IP_PRI_FILTER + 1,
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};
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static struct nf_hook_ops ing6_ops = {
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.hook = ing_hook,
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.owner = THIS_MODULE,
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.pf = PF_INET6,
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.hooknum = NF_IP6_PRE_ROUTING,
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.priority = NF_IP6_PRI_FILTER + 1,
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};
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#endif
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#endif
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static int ingress_init(struct Qdisc *sch,struct rtattr *opt)
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{
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struct ingress_qdisc_data *p = PRIV(sch);
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/* Make sure either netfilter or preferably CLS_ACT is
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* compiled in */
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#ifndef CONFIG_NET_CLS_ACT
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#ifndef CONFIG_NETFILTER
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printk("You MUST compile classifier actions into the kernel\n");
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return -EINVAL;
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#else
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printk("Ingress scheduler: Classifier actions prefered over netfilter\n");
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#endif
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#endif
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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if (!nf_registered) {
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if (nf_register_hook(&ing_ops) < 0) {
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printk("ingress qdisc registration error \n");
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return -EINVAL;
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}
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nf_registered++;
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if (nf_register_hook(&ing6_ops) < 0) {
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printk("IPv6 ingress qdisc registration error, " \
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"disabling IPv6 support.\n");
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} else
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nf_registered++;
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}
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#endif
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#endif
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DPRINTK("ingress_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
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p->q = &noop_qdisc;
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return 0;
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}
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static void ingress_reset(struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = PRIV(sch);
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DPRINTK("ingress_reset(sch %p,[qdisc %p])\n", sch, p);
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/*
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#if 0
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*/
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/* for future use */
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qdisc_reset(p->q);
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/*
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#endif
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*/
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}
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/* ------------------------------------------------------------- */
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/* ------------------------------------------------------------- */
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static void ingress_destroy(struct Qdisc *sch)
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{
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struct ingress_qdisc_data *p = PRIV(sch);
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struct tcf_proto *tp;
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DPRINTK("ingress_destroy(sch %p,[qdisc %p])\n", sch, p);
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while (p->filter_list) {
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tp = p->filter_list;
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p->filter_list = tp->next;
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tcf_destroy(tp);
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}
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#if 0
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/* for future use */
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qdisc_destroy(p->q);
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#endif
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}
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static int ingress_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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unsigned char *b = skb->tail;
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struct rtattr *rta;
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rta = (struct rtattr *) b;
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RTA_PUT(skb, TCA_OPTIONS, 0, NULL);
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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 Qdisc_class_ops ingress_class_ops = {
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.graft = ingress_graft,
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.leaf = ingress_leaf,
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.get = ingress_get,
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.put = ingress_put,
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.change = ingress_change,
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.delete = NULL,
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.walk = ingress_walk,
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.tcf_chain = ingress_find_tcf,
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.bind_tcf = ingress_bind_filter,
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.unbind_tcf = ingress_put,
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.dump = NULL,
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};
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static struct Qdisc_ops ingress_qdisc_ops = {
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.next = NULL,
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.cl_ops = &ingress_class_ops,
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.id = "ingress",
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.priv_size = sizeof(struct ingress_qdisc_data),
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.enqueue = ingress_enqueue,
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.dequeue = ingress_dequeue,
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.requeue = ingress_requeue,
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.drop = ingress_drop,
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.init = ingress_init,
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.reset = ingress_reset,
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.destroy = ingress_destroy,
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.change = NULL,
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.dump = ingress_dump,
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.owner = THIS_MODULE,
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};
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static int __init ingress_module_init(void)
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{
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int ret = 0;
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if ((ret = register_qdisc(&ingress_qdisc_ops)) < 0) {
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printk("Unable to register Ingress qdisc\n");
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return ret;
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}
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return ret;
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}
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static void __exit ingress_module_exit(void)
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{
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unregister_qdisc(&ingress_qdisc_ops);
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#ifndef CONFIG_NET_CLS_ACT
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#ifdef CONFIG_NETFILTER
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if (nf_registered) {
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nf_unregister_hook(&ing_ops);
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if (nf_registered > 1)
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nf_unregister_hook(&ing6_ops);
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}
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#endif
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#endif
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}
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module_init(ingress_module_init)
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module_exit(ingress_module_exit)
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MODULE_LICENSE("GPL");
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