480 lines
11 KiB
C
480 lines
11 KiB
C
/* net/sched/sch_dsmark.c - Differentiated Services field marker */
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/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h> /* for pkt_sched */
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#include <linux/rtnetlink.h>
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#include <net/pkt_sched.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <asm/byteorder.h>
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#if 1 /* 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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/*
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* classid class marking
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* ------- ----- -------
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* n/a 0 n/a
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* x:0 1 use entry [0]
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* ... ... ...
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* x:y y>0 y+1 use entry [y]
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* ... ... ...
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* x:indices-1 indices use entry [indices-1]
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* ... ... ...
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* x:y y+1 use entry [y & (indices-1)]
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* ... ... ...
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* 0xffff 0x10000 use entry [indices-1]
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*/
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#define NO_DEFAULT_INDEX (1 << 16)
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struct dsmark_qdisc_data {
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struct Qdisc *q;
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struct tcf_proto *filter_list;
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__u8 *mask; /* "owns" the array */
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__u8 *value;
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__u16 indices;
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__u32 default_index; /* index range is 0...0xffff */
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int set_tc_index;
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};
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/* ------------------------- Class/flow operations ------------------------- */
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static int dsmark_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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struct dsmark_qdisc_data *p = PRIV(sch);
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DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",sch,p,new,
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old);
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if (!new)
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new = &noop_qdisc;
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sch_tree_lock(sch);
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*old = xchg(&p->q,new);
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if (*old)
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qdisc_reset(*old);
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sch->q.qlen = 0;
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sch_tree_unlock(sch); /* @@@ move up ? */
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return 0;
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}
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static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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return p->q;
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}
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static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
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{
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struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
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DPRINTK("dsmark_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 dsmark_bind_filter(struct Qdisc *sch,
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unsigned long parent, u32 classid)
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{
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return dsmark_get(sch,classid);
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}
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static void dsmark_put(struct Qdisc *sch, unsigned long cl)
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{
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}
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static int dsmark_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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struct dsmark_qdisc_data *p = PRIV(sch);
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struct rtattr *opt = tca[TCA_OPTIONS-1];
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struct rtattr *tb[TCA_DSMARK_MAX];
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DPRINTK("dsmark_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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if (*arg > p->indices)
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return -ENOENT;
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if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt))
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return -EINVAL;
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if (tb[TCA_DSMARK_MASK-1]) {
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if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
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return -EINVAL;
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p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
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}
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if (tb[TCA_DSMARK_VALUE-1]) {
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if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
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return -EINVAL;
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p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
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}
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return 0;
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}
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static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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if (!arg || arg > p->indices)
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return -EINVAL;
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p->mask[arg-1] = 0xff;
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p->value[arg-1] = 0;
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return 0;
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}
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static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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int i;
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DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)\n",sch,p,walker);
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if (walker->stop)
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return;
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for (i = 0; i < p->indices; i++) {
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if (p->mask[i] == 0xff && !p->value[i])
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continue;
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if (walker->count >= walker->skip) {
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if (walker->fn(sch, i+1, walker) < 0) {
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walker->stop = 1;
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break;
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}
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}
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walker->count++;
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}
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}
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static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
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{
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struct dsmark_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 dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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struct tcf_result res;
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int result;
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int ret = NET_XMIT_POLICED;
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D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
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if (p->set_tc_index) {
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/* FIXME: Safe with non-linear skbs? --RR */
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switch (skb->protocol) {
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case __constant_htons(ETH_P_IP):
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skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
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& ~INET_ECN_MASK;
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break;
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case __constant_htons(ETH_P_IPV6):
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skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
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& ~INET_ECN_MASK;
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break;
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default:
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skb->tc_index = 0;
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break;
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};
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}
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result = TC_POLICE_OK; /* be nice to gcc */
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if (TC_H_MAJ(skb->priority) == sch->handle) {
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skb->tc_index = TC_H_MIN(skb->priority);
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} else {
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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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switch (result) {
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#ifdef CONFIG_NET_CLS_POLICE
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case TC_POLICE_SHOT:
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kfree_skb(skb);
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break;
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#if 0
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case TC_POLICE_RECLASSIFY:
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/* FIXME: what to do here ??? */
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#endif
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#endif
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case TC_POLICE_OK:
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skb->tc_index = TC_H_MIN(res.classid);
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break;
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case TC_POLICE_UNSPEC:
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/* fall through */
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default:
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if (p->default_index != NO_DEFAULT_INDEX)
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skb->tc_index = p->default_index;
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break;
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};
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}
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if (
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#ifdef CONFIG_NET_CLS_POLICE
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result == TC_POLICE_SHOT ||
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#endif
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((ret = p->q->enqueue(skb,p->q)) != 0)) {
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sch->qstats.drops++;
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return ret;
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}
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sch->bstats.bytes += skb->len;
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sch->bstats.packets++;
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sch->q.qlen++;
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return ret;
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}
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static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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struct sk_buff *skb;
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int index;
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D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n",sch,p);
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skb = p->q->ops->dequeue(p->q);
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if (!skb)
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return NULL;
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sch->q.qlen--;
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index = skb->tc_index & (p->indices-1);
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D2PRINTK("index %d->%d\n",skb->tc_index,index);
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switch (skb->protocol) {
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case __constant_htons(ETH_P_IP):
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ipv4_change_dsfield(skb->nh.iph,
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p->mask[index],p->value[index]);
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break;
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case __constant_htons(ETH_P_IPV6):
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ipv6_change_dsfield(skb->nh.ipv6h,
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p->mask[index],p->value[index]);
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break;
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default:
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/*
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* Only complain if a change was actually attempted.
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* This way, we can send non-IP traffic through dsmark
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* and don't need yet another qdisc as a bypass.
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*/
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if (p->mask[index] != 0xff || p->value[index])
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printk(KERN_WARNING "dsmark_dequeue: "
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"unsupported protocol %d\n",
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htons(skb->protocol));
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break;
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};
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return skb;
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}
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static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
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{
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int ret;
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struct dsmark_qdisc_data *p = PRIV(sch);
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D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n",skb,sch,p);
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if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
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sch->q.qlen++;
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sch->qstats.requeues++;
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return 0;
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}
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sch->qstats.drops++;
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return ret;
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}
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static unsigned int dsmark_drop(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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unsigned int len;
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DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
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if (!p->q->ops->drop)
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return 0;
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if (!(len = p->q->ops->drop(p->q)))
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return 0;
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sch->q.qlen--;
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return len;
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}
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static int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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struct rtattr *tb[TCA_DSMARK_MAX];
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__u16 tmp;
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DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n",sch,p,opt);
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if (!opt ||
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rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
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!tb[TCA_DSMARK_INDICES-1] ||
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RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
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return -EINVAL;
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p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
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if (!p->indices)
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return -EINVAL;
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for (tmp = p->indices; tmp != 1; tmp >>= 1) {
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if (tmp & 1)
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return -EINVAL;
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}
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p->default_index = NO_DEFAULT_INDEX;
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if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
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if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
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return -EINVAL;
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p->default_index =
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*(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
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}
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p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
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p->mask = kmalloc(p->indices*2,GFP_KERNEL);
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if (!p->mask)
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return -ENOMEM;
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p->value = p->mask+p->indices;
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memset(p->mask,0xff,p->indices);
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memset(p->value,0,p->indices);
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if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
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p->q = &noop_qdisc;
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DPRINTK("dsmark_init: qdisc %p\n",&p->q);
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return 0;
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}
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static void dsmark_reset(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
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qdisc_reset(p->q);
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sch->q.qlen = 0;
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}
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static void dsmark_destroy(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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struct tcf_proto *tp;
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DPRINTK("dsmark_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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qdisc_destroy(p->q);
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kfree(p->mask);
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}
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static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
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struct sk_buff *skb, struct tcmsg *tcm)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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unsigned char *b = skb->tail;
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struct rtattr *rta;
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DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n",sch,p,cl);
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if (!cl || cl > p->indices)
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return -EINVAL;
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tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
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rta = (struct rtattr *) b;
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RTA_PUT(skb,TCA_OPTIONS,0,NULL);
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RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
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RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
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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 int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct dsmark_qdisc_data *p = PRIV(sch);
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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_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
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if (p->default_index != NO_DEFAULT_INDEX) {
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__u16 tmp = p->default_index;
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RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp);
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}
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if (p->set_tc_index)
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RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 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 dsmark_class_ops = {
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.graft = dsmark_graft,
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.leaf = dsmark_leaf,
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.get = dsmark_get,
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.put = dsmark_put,
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.change = dsmark_change,
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.delete = dsmark_delete,
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.walk = dsmark_walk,
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.tcf_chain = dsmark_find_tcf,
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.bind_tcf = dsmark_bind_filter,
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.unbind_tcf = dsmark_put,
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.dump = dsmark_dump_class,
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};
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static struct Qdisc_ops dsmark_qdisc_ops = {
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.next = NULL,
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.cl_ops = &dsmark_class_ops,
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.id = "dsmark",
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.priv_size = sizeof(struct dsmark_qdisc_data),
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.enqueue = dsmark_enqueue,
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.dequeue = dsmark_dequeue,
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.requeue = dsmark_requeue,
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.drop = dsmark_drop,
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.init = dsmark_init,
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.reset = dsmark_reset,
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.destroy = dsmark_destroy,
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.change = NULL,
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.dump = dsmark_dump,
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.owner = THIS_MODULE,
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};
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static int __init dsmark_module_init(void)
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{
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return register_qdisc(&dsmark_qdisc_ops);
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}
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static void __exit dsmark_module_exit(void)
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{
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unregister_qdisc(&dsmark_qdisc_ops);
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}
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module_init(dsmark_module_init)
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module_exit(dsmark_module_exit)
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MODULE_LICENSE("GPL");
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