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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/sched/sch_dsmark.c | |
download | kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_smdk4412-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/sched/sch_dsmark.c')
-rw-r--r-- | net/sched/sch_dsmark.c | 479 |
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 0000000..8a3db9d --- /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"); 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