/* net/sched/sch_dsmark.c - Differentiated Services field marker */ /* Written 1998-2000 by Werner Almesberger, EPFL ICA */ #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/rtnetlink.h> #include <net/pkt_sched.h> #include <net/dsfield.h> #include <net/inet_ecn.h> #include <asm/byteorder.h> #if 0 /* 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 *) 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; }; static inline int dsmark_valid_indices(u16 indices) { while (indices != 1) { if (indices & 1) return 0; indices >>= 1; } return 1; } static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index) { return (index <= p->indices && index > 0); } /* ------------------------- 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 == NULL) { new = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle); if (new == NULL) new = &noop_qdisc; } sch_tree_lock(sch); *old = xchg(&p->q, new); qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); qdisc_reset(*old); sch_tree_unlock(sch); return 0; } static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg) { return PRIV(sch)->q; } static unsigned long dsmark_get(struct Qdisc *sch, u32 classid) { DPRINTK("dsmark_get(sch %p,[qdisc %p],classid %x)\n", sch, PRIV(sch), 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]; int err = -EINVAL; u8 mask = 0; DPRINTK("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x)," "arg 0x%lx\n", sch, p, classid, parent, *arg); if (!dsmark_valid_index(p, *arg)) { err = -ENOENT; goto rtattr_failure; } if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt)) goto rtattr_failure; if (tb[TCA_DSMARK_MASK-1]) mask = RTA_GET_U8(tb[TCA_DSMARK_MASK-1]); if (tb[TCA_DSMARK_VALUE-1]) p->value[*arg-1] = RTA_GET_U8(tb[TCA_DSMARK_VALUE-1]); if (tb[TCA_DSMARK_MASK-1]) p->mask[*arg-1] = mask; err = 0; rtattr_failure: return err; } static int dsmark_delete(struct Qdisc *sch, unsigned long arg) { struct dsmark_qdisc_data *p = PRIV(sch); if (!dsmark_valid_index(p, arg)) 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]) goto ignore; if (walker->count >= walker->skip) { if (walker->fn(sch, i+1, walker) < 0) { walker->stop = 1; break; } } ignore: walker->count++; } } static struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,unsigned long cl) { return &PRIV(sch)->filter_list; } /* --------------------------- Qdisc operations ---------------------------- */ static int dsmark_enqueue(struct sk_buff *skb,struct Qdisc *sch) { struct dsmark_qdisc_data *p = PRIV(sch); int err; 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(ip_hdr(skb)) & ~INET_ECN_MASK; break; case __constant_htons(ETH_P_IPV6): skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb)) & ~INET_ECN_MASK; break; default: skb->tc_index = 0; break; } } if (TC_H_MAJ(skb->priority) == sch->handle) skb->tc_index = TC_H_MIN(skb->priority); else { struct tcf_result res; int result = tc_classify(skb, p->filter_list, &res); D2PRINTK("result %d class 0x%04x\n", result, res.classid); switch (result) { #ifdef CONFIG_NET_CLS_ACT case TC_ACT_QUEUED: case TC_ACT_STOLEN: kfree_skb(skb); return NET_XMIT_SUCCESS; case TC_ACT_SHOT: kfree_skb(skb); sch->qstats.drops++; return NET_XMIT_BYPASS; #endif case TC_ACT_OK: skb->tc_index = TC_H_MIN(res.classid); break; default: if (p->default_index != NO_DEFAULT_INDEX) skb->tc_index = p->default_index; break; } } err = p->q->enqueue(skb,p->q); if (err != NET_XMIT_SUCCESS) { sch->qstats.drops++; return err; } sch->bstats.bytes += skb->len; sch->bstats.packets++; sch->q.qlen++; return NET_XMIT_SUCCESS; } static struct sk_buff *dsmark_dequeue(struct Qdisc *sch) { struct dsmark_qdisc_data *p = PRIV(sch); struct sk_buff *skb; u32 index; D2PRINTK("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p); skb = p->q->ops->dequeue(p->q); if (skb == NULL) 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(ip_hdr(skb), p->mask[index], p->value[index]); break; case __constant_htons(ETH_P_IPV6): ipv6_change_dsfield(ipv6_hdr(skb), 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", ntohs(skb->protocol)); break; } return skb; } static int dsmark_requeue(struct sk_buff *skb,struct Qdisc *sch) { struct dsmark_qdisc_data *p = PRIV(sch); int err; D2PRINTK("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); err = p->q->ops->requeue(skb, p->q); if (err != NET_XMIT_SUCCESS) { sch->qstats.drops++; return err; } sch->q.qlen++; sch->qstats.requeues++; return NET_XMIT_SUCCESS; } 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 == NULL) return 0; len = p->q->ops->drop(p->q); if (len) 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]; int err = -EINVAL; u32 default_index = NO_DEFAULT_INDEX; u16 indices; u8 *mask; DPRINTK("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); if (!opt || rtattr_parse_nested(tb, TCA_DSMARK_MAX, opt) < 0) goto errout; indices = RTA_GET_U16(tb[TCA_DSMARK_INDICES-1]); if (!indices || !dsmark_valid_indices(indices)) goto errout; if (tb[TCA_DSMARK_DEFAULT_INDEX-1]) default_index = RTA_GET_U16(tb[TCA_DSMARK_DEFAULT_INDEX-1]); mask = kmalloc(indices * 2, GFP_KERNEL); if (mask == NULL) { err = -ENOMEM; goto errout; } p->mask = mask; memset(p->mask, 0xff, indices); p->value = p->mask + indices; memset(p->value, 0, indices); p->indices = indices; p->default_index = default_index; p->set_tc_index = RTA_GET_FLAG(tb[TCA_DSMARK_SET_TC_INDEX-1]); p->q = qdisc_create_dflt(sch->dev, &pfifo_qdisc_ops, sch->handle); if (p->q == NULL) p->q = &noop_qdisc; DPRINTK("dsmark_init: qdisc %p\n", p->q); err = 0; errout: rtattr_failure: return err; } 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); DPRINTK("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p); tcf_destroy_chain(p->filter_list); 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); struct rtattr *opts = NULL; DPRINTK("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl); if (!dsmark_valid_index(p, cl)) return -EINVAL; tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1); tcm->tcm_info = p->q->handle; opts = RTA_NEST(skb, TCA_OPTIONS); RTA_PUT_U8(skb,TCA_DSMARK_MASK, p->mask[cl-1]); RTA_PUT_U8(skb,TCA_DSMARK_VALUE, p->value[cl-1]); return RTA_NEST_END(skb, opts); rtattr_failure: return RTA_NEST_CANCEL(skb, opts); } static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb) { struct dsmark_qdisc_data *p = PRIV(sch); struct rtattr *opts = NULL; opts = RTA_NEST(skb, TCA_OPTIONS); RTA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices); if (p->default_index != NO_DEFAULT_INDEX) RTA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index); if (p->set_tc_index) RTA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX); return RTA_NEST_END(skb, opts); rtattr_failure: return RTA_NEST_CANCEL(skb, opts); } 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");