summaryrefslogtreecommitdiffstats
path: root/net/sched/sch_dsmark.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/sched/sch_dsmark.c')
-rw-r--r--net/sched/sch_dsmark.c479
1 files changed, 479 insertions, 0 deletions
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c
new file mode 100644
index 000000000000..8a3db9d95bab
--- /dev/null
+++ b/net/sched/sch_dsmark.c
@@ -0,0 +1,479 @@
+/* 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/init.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 <net/inet_ecn.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) qdisc_priv(sch)
+
+
+/*
+ * 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->q.qlen = 0;
+ 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%lx\n",sch,p,classid,parent,*arg);
+ if (*arg > p->indices)
+ return -ENOENT;
+ if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, 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) {
+ /* FIXME: Safe with non-linear skbs? --RR */
+ switch (skb->protocol) {
+ case __constant_htons(ETH_P_IP):
+ skb->tc_index = ipv4_get_dsfield(skb->nh.iph)
+ & ~INET_ECN_MASK;
+ break;
+ case __constant_htons(ETH_P_IPV6):
+ skb->tc_index = ipv6_get_dsfield(skb->nh.ipv6h)
+ & ~INET_ECN_MASK;
+ 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%04x\n",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->qstats.drops++;
+ return ret;
+ }
+ sch->bstats.bytes += skb->len;
+ sch->bstats.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->%d\n",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 %d\n",
+ 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++;
+ sch->qstats.requeues++;
+ return 0;
+ }
+ sch->qstats.drops++;
+ return ret;
+}
+
+
+static unsigned int dsmark_drop(struct Qdisc *sch)
+{
+ struct dsmark_qdisc_data *p = PRIV(sch);
+ unsigned int len;
+
+ DPRINTK("dsmark_reset(sch %p,[qdisc %p])\n",sch,p);
+ if (!p->q->ops->drop)
+ return 0;
+ if (!(len = p->q->ops->drop(p->q)))
+ return 0;
+ sch->q.qlen--;
+ return len;
+}
+
+
+static 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 (!opt ||
+ 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;
+ 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 %p\n",&p->q);
+ 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;
+ tcf_destroy(tp);
+ }
+ qdisc_destroy(p->q);
+ kfree(p->mask);
+}
+
+
+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 %ld\n",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 = {
+ .graft = dsmark_graft,
+ .leaf = dsmark_leaf,
+ .get = dsmark_get,
+ .put = dsmark_put,
+ .change = dsmark_change,
+ .delete = dsmark_delete,
+ .walk = dsmark_walk,
+ .tcf_chain = dsmark_find_tcf,
+ .bind_tcf = dsmark_bind_filter,
+ .unbind_tcf = dsmark_put,
+ .dump = dsmark_dump_class,
+};
+
+static struct Qdisc_ops dsmark_qdisc_ops = {
+ .next = NULL,
+ .cl_ops = &dsmark_class_ops,
+ .id = "dsmark",
+ .priv_size = sizeof(struct dsmark_qdisc_data),
+ .enqueue = dsmark_enqueue,
+ .dequeue = dsmark_dequeue,
+ .requeue = dsmark_requeue,
+ .drop = dsmark_drop,
+ .init = dsmark_init,
+ .reset = dsmark_reset,
+ .destroy = dsmark_destroy,
+ .change = NULL,
+ .dump = dsmark_dump,
+ .owner = THIS_MODULE,
+};
+
+static int __init dsmark_module_init(void)
+{
+ return register_qdisc(&dsmark_qdisc_ops);
+}
+static void __exit dsmark_module_exit(void)
+{
+ unregister_qdisc(&dsmark_qdisc_ops);
+}
+module_init(dsmark_module_init)
+module_exit(dsmark_module_exit)
+MODULE_LICENSE("GPL");