sch_dsmark.c
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上传日期:2013-04-10
资源大小:33168k
文件大小:11k
- /* net/sched/sch_dsmark.c - Differentiated Services field marker */
- /* Written 1998-2000 by Werner Almesberger, EPFL ICA */
- #include <linux/config.h>
- #include <linux/module.h>
- #include <linux/types.h>
- #include <linux/string.h>
- #include <linux/errno.h>
- #include <linux/skbuff.h>
- #include <linux/netdevice.h> /* for pkt_sched */
- #include <linux/rtnetlink.h>
- #include <net/pkt_sched.h>
- #include <net/dsfield.h>
- #include <asm/byteorder.h>
- #if 1 /* control */
- #define DPRINTK(format,args...) printk(KERN_DEBUG format,##args)
- #else
- #define DPRINTK(format,args...)
- #endif
- #if 0 /* data */
- #define D2PRINTK(format,args...) printk(KERN_DEBUG format,##args)
- #else
- #define D2PRINTK(format,args...)
- #endif
- #define PRIV(sch) ((struct dsmark_qdisc_data *) (sch)->data)
- /*
- * classid class marking
- * ------- ----- -------
- * n/a 0 n/a
- * x:0 1 use entry [0]
- * ... ... ...
- * x:y y>0 y+1 use entry [y]
- * ... ... ...
- * x:indices-1 indices use entry [indices-1]
- * ... ... ...
- * x:y y+1 use entry [y & (indices-1)]
- * ... ... ...
- * 0xffff 0x10000 use entry [indices-1]
- */
- #define NO_DEFAULT_INDEX (1 << 16)
- struct dsmark_qdisc_data {
- struct Qdisc *q;
- struct tcf_proto *filter_list;
- __u8 *mask; /* "owns" the array */
- __u8 *value;
- __u16 indices;
- __u32 default_index; /* index range is 0...0xffff */
- int set_tc_index;
- };
- /* ------------------------- Class/flow operations ------------------------- */
- static int dsmark_graft(struct Qdisc *sch,unsigned long arg,
- struct Qdisc *new,struct Qdisc **old)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- DPRINTK("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)n",sch,p,new,
- old);
- if (!new)
- new = &noop_qdisc;
- sch_tree_lock(sch);
- *old = xchg(&p->q,new);
- if (*old)
- qdisc_reset(*old);
- sch_tree_unlock(sch); /* @@@ move up ? */
- return 0;
- }
- static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- return p->q;
- }
- static unsigned long dsmark_get(struct Qdisc *sch,u32 classid)
- {
- struct dsmark_qdisc_data *p __attribute__((unused)) = PRIV(sch);
- DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)n",sch,p,classid);
- return TC_H_MIN(classid)+1;
- }
- static unsigned long dsmark_bind_filter(struct Qdisc *sch,
- unsigned long parent, u32 classid)
- {
- return dsmark_get(sch,classid);
- }
- static void dsmark_put(struct Qdisc *sch, unsigned long cl)
- {
- }
- static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
- struct rtattr **tca, unsigned long *arg)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- struct rtattr *opt = tca[TCA_OPTIONS-1];
- struct rtattr *tb[TCA_DSMARK_MAX];
- DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
- "arg 0x%lxn",sch,p,classid,parent,*arg);
- if (*arg > p->indices)
- return -ENOENT;
- if (!opt || rtattr_parse(tb, TCA_DSMARK_MAX, RTA_DATA(opt),
- RTA_PAYLOAD(opt)))
- return -EINVAL;
- if (tb[TCA_DSMARK_MASK-1]) {
- if (!RTA_PAYLOAD(tb[TCA_DSMARK_MASK-1]))
- return -EINVAL;
- p->mask[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_MASK-1]);
- }
- if (tb[TCA_DSMARK_VALUE-1]) {
- if (!RTA_PAYLOAD(tb[TCA_DSMARK_VALUE-1]))
- return -EINVAL;
- p->value[*arg-1] = *(__u8 *) RTA_DATA(tb[TCA_DSMARK_VALUE-1]);
- }
- return 0;
- }
- static int dsmark_delete(struct Qdisc *sch,unsigned long arg)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- if (!arg || arg > p->indices)
- return -EINVAL;
- p->mask[arg-1] = 0xff;
- p->value[arg-1] = 0;
- return 0;
- }
- static void dsmark_walk(struct Qdisc *sch,struct qdisc_walker *walker)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- int i;
- DPRINTK("dsmark_walk(sch %p,[qdisc %p],walker %p)n",sch,p,walker);
- if (walker->stop)
- return;
- for (i = 0; i < p->indices; i++) {
- if (p->mask[i] == 0xff && !p->value[i])
- continue;
- if (walker->count >= walker->skip) {
- if (walker->fn(sch, i+1, walker) < 0) {
- walker->stop = 1;
- break;
- }
- }
- walker->count++;
- }
- }
- static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- return &p->filter_list;
- }
- /* --------------------------- Qdisc operations ---------------------------- */
- static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- struct tcf_result res;
- int result;
- int ret = NET_XMIT_POLICED;
- D2PRINTK("dsmark_enqueue(skb %p,sch %p,[qdisc %p])n",skb,sch,p);
- if (p->set_tc_index) {
- switch (skb->protocol) {
- case __constant_htons(ETH_P_IP):
- skb->tc_index = ipv4_get_dsfield(skb->nh.iph);
- break;
- case __constant_htons(ETH_P_IPV6):
- skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h);
- break;
- default:
- skb->tc_index = 0;
- break;
- };
- }
- result = TC_POLICE_OK; /* be nice to gcc */
- if (TC_H_MAJ(skb->priority) == sch->handle) {
- skb->tc_index = TC_H_MIN(skb->priority);
- } else {
- result = tc_classify(skb,p->filter_list,&res);
- D2PRINTK("result %d class 0x%04xn",result,res.classid);
- switch (result) {
- #ifdef CONFIG_NET_CLS_POLICE
- case TC_POLICE_SHOT:
- kfree_skb(skb);
- break;
- #if 0
- case TC_POLICE_RECLASSIFY:
- /* FIXME: what to do here ??? */
- #endif
- #endif
- case TC_POLICE_OK:
- skb->tc_index = TC_H_MIN(res.classid);
- break;
- case TC_POLICE_UNSPEC:
- /* fall through */
- default:
- if (p->default_index != NO_DEFAULT_INDEX)
- skb->tc_index = p->default_index;
- break;
- };
- }
- if (
- #ifdef CONFIG_NET_CLS_POLICE
- result == TC_POLICE_SHOT ||
- #endif
- ((ret = p->q->enqueue(skb,p->q)) != 0)) {
- sch->stats.drops++;
- return ret;
- }
- sch->stats.bytes += skb->len;
- sch->stats.packets++;
- sch->q.qlen++;
- return ret;
- }
- static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- struct sk_buff *skb;
- int index;
- D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])n",sch,p);
- skb = p->q->ops->dequeue(p->q);
- if (!skb)
- return NULL;
- sch->q.qlen--;
- index = skb->tc_index & (p->indices-1);
- D2PRINTK("index %d->%dn",skb->tc_index,index);
- switch (skb->protocol) {
- case __constant_htons(ETH_P_IP):
- ipv4_change_dsfield(skb->nh.iph,
- p->mask[index],p->value[index]);
- break;
- case __constant_htons(ETH_P_IPV6):
- ipv6_change_dsfield(skb->nh.ipv6h,
- p->mask[index],p->value[index]);
- break;
- default:
- /*
- * Only complain if a change was actually attempted.
- * This way, we can send non-IP traffic through dsmark
- * and don't need yet another qdisc as a bypass.
- */
- if (p->mask[index] != 0xff || p->value[index])
- printk(KERN_WARNING "dsmark_dequeue: "
- "unsupported protocol %dn",
- htons(skb->protocol));
- break;
- };
- return skb;
- }
- static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch)
- {
- int ret;
- struct dsmark_qdisc_data *p = PRIV(sch);
- D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])n",skb,sch,p);
- if ((ret = p->q->ops->requeue(skb, p->q)) == 0) {
- sch->q.qlen++;
- return 0;
- }
- sch->stats.drops++;
- return ret;
- }
- static int dsmark_drop(struct Qdisc *sch)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- DPRINTK("dsmark_reset(sch %p,[qdisc %p])n",sch,p);
- if (!p->q->ops->drop)
- return 0;
- if (!p->q->ops->drop(p->q))
- return 0;
- sch->q.qlen--;
- return 1;
- }
- int dsmark_init(struct Qdisc *sch,struct rtattr *opt)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- struct rtattr *tb[TCA_DSMARK_MAX];
- __u16 tmp;
- DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)n",sch,p,opt);
- if (rtattr_parse(tb,TCA_DSMARK_MAX,RTA_DATA(opt),RTA_PAYLOAD(opt)) < 0 ||
- !tb[TCA_DSMARK_INDICES-1] ||
- RTA_PAYLOAD(tb[TCA_DSMARK_INDICES-1]) < sizeof(__u16))
- return -EINVAL;
- memset(p,0,sizeof(*p));
- p->filter_list = NULL;
- p->indices = *(__u16 *) RTA_DATA(tb[TCA_DSMARK_INDICES-1]);
- if (!p->indices)
- return -EINVAL;
- for (tmp = p->indices; tmp != 1; tmp >>= 1) {
- if (tmp & 1)
- return -EINVAL;
- }
- p->default_index = NO_DEFAULT_INDEX;
- if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) {
- if (RTA_PAYLOAD(tb[TCA_DSMARK_DEFAULT_INDEX-1]) < sizeof(__u16))
- return -EINVAL;
- p->default_index =
- *(__u16 *) RTA_DATA(tb[TCA_DSMARK_DEFAULT_INDEX-1]);
- }
- p->set_tc_index = !!tb[TCA_DSMARK_SET_TC_INDEX-1];
- p->mask = kmalloc(p->indices*2,GFP_KERNEL);
- if (!p->mask)
- return -ENOMEM;
- p->value = p->mask+p->indices;
- memset(p->mask,0xff,p->indices);
- memset(p->value,0,p->indices);
- if (!(p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops)))
- p->q = &noop_qdisc;
- DPRINTK("dsmark_init: qdisc %pn",&p->q);
- MOD_INC_USE_COUNT;
- return 0;
- }
- static void dsmark_reset(struct Qdisc *sch)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- DPRINTK("dsmark_reset(sch %p,[qdisc %p])n",sch,p);
- qdisc_reset(p->q);
- sch->q.qlen = 0;
- }
- static void dsmark_destroy(struct Qdisc *sch)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- struct tcf_proto *tp;
- DPRINTK("dsmark_destroy(sch %p,[qdisc %p])n",sch,p);
- while (p->filter_list) {
- tp = p->filter_list;
- p->filter_list = tp->next;
- tp->ops->destroy(tp);
- }
- qdisc_destroy(p->q);
- p->q = &noop_qdisc;
- kfree(p->mask);
- MOD_DEC_USE_COUNT;
- }
- static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
- struct sk_buff *skb, struct tcmsg *tcm)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- unsigned char *b = skb->tail;
- struct rtattr *rta;
- DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ldn",sch,p,cl);
- if (!cl || cl > p->indices)
- return -EINVAL;
- tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle),cl-1);
- rta = (struct rtattr *) b;
- RTA_PUT(skb,TCA_OPTIONS,0,NULL);
- RTA_PUT(skb,TCA_DSMARK_MASK,1,&p->mask[cl-1]);
- RTA_PUT(skb,TCA_DSMARK_VALUE,1,&p->value[cl-1]);
- rta->rta_len = skb->tail-b;
- return skb->len;
- rtattr_failure:
- skb_trim(skb,b-skb->data);
- return -1;
- }
- static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
- {
- struct dsmark_qdisc_data *p = PRIV(sch);
- unsigned char *b = skb->tail;
- struct rtattr *rta;
- rta = (struct rtattr *) b;
- RTA_PUT(skb,TCA_OPTIONS,0,NULL);
- RTA_PUT(skb,TCA_DSMARK_INDICES,sizeof(__u16),&p->indices);
- if (p->default_index != NO_DEFAULT_INDEX) {
- __u16 tmp = p->default_index;
- RTA_PUT(skb,TCA_DSMARK_DEFAULT_INDEX, sizeof(__u16), &tmp);
- }
- if (p->set_tc_index)
- RTA_PUT(skb, TCA_DSMARK_SET_TC_INDEX, 0, NULL);
- rta->rta_len = skb->tail-b;
- return skb->len;
- rtattr_failure:
- skb_trim(skb,b-skb->data);
- return -1;
- }
- static struct Qdisc_class_ops dsmark_class_ops =
- {
- dsmark_graft, /* graft */
- dsmark_leaf, /* leaf */
- dsmark_get, /* get */
- dsmark_put, /* put */
- dsmark_change, /* change */
- dsmark_delete, /* delete */
- dsmark_walk, /* walk */
- dsmark_find_tcf, /* tcf_chain */
- dsmark_bind_filter, /* bind_tcf */
- dsmark_put, /* unbind_tcf */
- dsmark_dump_class, /* dump */
- };
- struct Qdisc_ops dsmark_qdisc_ops =
- {
- NULL, /* next */
- &dsmark_class_ops, /* cl_ops */
- "dsmark",
- sizeof(struct dsmark_qdisc_data),
- dsmark_enqueue, /* enqueue */
- dsmark_dequeue, /* dequeue */
- dsmark_requeue, /* requeue */
- dsmark_drop, /* drop */
- dsmark_init, /* init */
- dsmark_reset, /* reset */
- dsmark_destroy, /* destroy */
- NULL, /* change */
- dsmark_dump /* dump */
- };
- #ifdef MODULE
- int init_module(void)
- {
- return register_qdisc(&dsmark_qdisc_ops);
- }
- void cleanup_module(void)
- {
- unregister_qdisc(&dsmark_qdisc_ops);
- }
- #endif
- MODULE_LICENSE("GPL");