diff options
Diffstat (limited to 'net/sched/sch_dsmark.c')
| -rw-r--r-- | net/sched/sch_dsmark.c | 512 |
1 files changed, 0 insertions, 512 deletions
diff --git a/net/sched/sch_dsmark.c b/net/sched/sch_dsmark.c deleted file mode 100644 index 3886365cc207..000000000000 --- a/net/sched/sch_dsmark.c +++ /dev/null @@ -1,512 +0,0 @@ -/* 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/slab.h> -#include <linux/types.h> -#include <linux/string.h> -#include <linux/errno.h> -#include <linux/skbuff.h> -#include <linux/rtnetlink.h> -#include <linux/bitops.h> -#include <net/pkt_sched.h> -#include <net/dsfield.h> -#include <net/inet_ecn.h> -#include <asm/byteorder.h> - -/* - * 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_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 = qdisc_priv(sch); - - pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n", - sch, p, new, old); - - if (new == NULL) { - new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, - sch->handle); - if (new == NULL) - new = &noop_qdisc; - } - - sch_tree_lock(sch); - *old = p->q; - 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) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - return p->q; -} - -static unsigned long dsmark_get(struct Qdisc *sch, u32 classid) -{ - pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n", - sch, qdisc_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 const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = { - [TCA_DSMARK_INDICES] = { .type = NLA_U16 }, - [TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 }, - [TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG }, - [TCA_DSMARK_MASK] = { .type = NLA_U8 }, - [TCA_DSMARK_VALUE] = { .type = NLA_U8 }, -}; - -static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent, - struct nlattr **tca, unsigned long *arg) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - struct nlattr *opt = tca[TCA_OPTIONS]; - struct nlattr *tb[TCA_DSMARK_MAX + 1]; - int err = -EINVAL; - u8 mask = 0; - - pr_debug("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 errout; - } - - if (!opt) - goto errout; - - err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy); - if (err < 0) - goto errout; - - if (tb[TCA_DSMARK_MASK]) - mask = nla_get_u8(tb[TCA_DSMARK_MASK]); - - if (tb[TCA_DSMARK_VALUE]) - p->value[*arg - 1] = nla_get_u8(tb[TCA_DSMARK_VALUE]); - - if (tb[TCA_DSMARK_MASK]) - p->mask[*arg - 1] = mask; - - err = 0; - -errout: - return err; -} - -static int dsmark_delete(struct Qdisc *sch, unsigned long arg) -{ - struct dsmark_qdisc_data *p = qdisc_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 = qdisc_priv(sch); - int i; - - pr_debug("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 inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch, - unsigned long cl) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - return &p->filter_list; -} - -/* --------------------------- Qdisc operations ---------------------------- */ - -static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - int err; - - pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p); - - if (p->set_tc_index) { - switch (skb->protocol) { - case htons(ETH_P_IP): - if (skb_cow_head(skb, sizeof(struct iphdr))) - goto drop; - - skb->tc_index = ipv4_get_dsfield(ip_hdr(skb)) - & ~INET_ECN_MASK; - break; - - case htons(ETH_P_IPV6): - if (skb_cow_head(skb, sizeof(struct ipv6hdr))) - goto drop; - - 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); - - pr_debug("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 | __NET_XMIT_STOLEN; - - case TC_ACT_SHOT: - goto drop; -#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 = qdisc_enqueue(skb, p->q); - if (err != NET_XMIT_SUCCESS) { - if (net_xmit_drop_count(err)) - sch->qstats.drops++; - return err; - } - - sch->q.qlen++; - - return NET_XMIT_SUCCESS; - -drop: - qdisc_drop(skb, sch); - return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; -} - -static struct sk_buff *dsmark_dequeue(struct Qdisc *sch) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - struct sk_buff *skb; - u32 index; - - pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p); - - skb = p->q->ops->dequeue(p->q); - if (skb == NULL) - return NULL; - - qdisc_bstats_update(sch, skb); - sch->q.qlen--; - - index = skb->tc_index & (p->indices - 1); - pr_debug("index %d->%d\n", skb->tc_index, index); - - switch (skb->protocol) { - case htons(ETH_P_IP): - ipv4_change_dsfield(ip_hdr(skb), p->mask[index], - p->value[index]); - break; - case 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]) - pr_warning("dsmark_dequeue: unsupported protocol %d\n", - ntohs(skb->protocol)); - break; - } - - return skb; -} - -static struct sk_buff *dsmark_peek(struct Qdisc *sch) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - - pr_debug("dsmark_peek(sch %p,[qdisc %p])\n", sch, p); - - return p->q->ops->peek(p->q); -} - -static unsigned int dsmark_drop(struct Qdisc *sch) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - unsigned int len; - - pr_debug("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 nlattr *opt) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - struct nlattr *tb[TCA_DSMARK_MAX + 1]; - int err = -EINVAL; - u32 default_index = NO_DEFAULT_INDEX; - u16 indices; - u8 *mask; - - pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt); - - if (!opt) - goto errout; - - err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy); - if (err < 0) - goto errout; - - err = -EINVAL; - indices = nla_get_u16(tb[TCA_DSMARK_INDICES]); - - if (hweight32(indices) != 1) - goto errout; - - if (tb[TCA_DSMARK_DEFAULT_INDEX]) - default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]); - - 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 = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]); - - p->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, sch->handle); - if (p->q == NULL) - p->q = &noop_qdisc; - - pr_debug("dsmark_init: qdisc %p\n", p->q); - - err = 0; -errout: - return err; -} - -static void dsmark_reset(struct Qdisc *sch) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - - pr_debug("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 = qdisc_priv(sch); - - pr_debug("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 = qdisc_priv(sch); - struct nlattr *opts = NULL; - - pr_debug("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 = nla_nest_start(skb, TCA_OPTIONS); - if (opts == NULL) - goto nla_put_failure; - if (nla_put_u8(skb, TCA_DSMARK_MASK, p->mask[cl - 1]) || - nla_put_u8(skb, TCA_DSMARK_VALUE, p->value[cl - 1])) - goto nla_put_failure; - - return nla_nest_end(skb, opts); - -nla_put_failure: - nla_nest_cancel(skb, opts); - return -EMSGSIZE; -} - -static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb) -{ - struct dsmark_qdisc_data *p = qdisc_priv(sch); - struct nlattr *opts = NULL; - - opts = nla_nest_start(skb, TCA_OPTIONS); - if (opts == NULL) - goto nla_put_failure; - if (nla_put_u16(skb, TCA_DSMARK_INDICES, p->indices)) - goto nla_put_failure; - - if (p->default_index != NO_DEFAULT_INDEX && - nla_put_u16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index)) - goto nla_put_failure; - - if (p->set_tc_index && - nla_put_flag(skb, TCA_DSMARK_SET_TC_INDEX)) - goto nla_put_failure; - - return nla_nest_end(skb, opts); - -nla_put_failure: - nla_nest_cancel(skb, opts); - return -EMSGSIZE; -} - -static const 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 __read_mostly = { - .next = NULL, - .cl_ops = &dsmark_class_ops, - .id = "dsmark", - .priv_size = sizeof(struct dsmark_qdisc_data), - .enqueue = dsmark_enqueue, - .dequeue = dsmark_dequeue, - .peek = dsmark_peek, - .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"); |