506 lines
11 KiB
C
506 lines
11 KiB
C
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/* net/sched/sch_dsmark.c - Differentiated Services field marker */
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/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/bitops.h>
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#include <net/pkt_sched.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <asm/byteorder.h>
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/*
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* classid class marking
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* ------- ----- -------
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* n/a 0 n/a
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* x:0 1 use entry [0]
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* ... ... ...
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* x:y y>0 y+1 use entry [y]
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* ... ... ...
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* x:indices-1 indices use entry [indices-1]
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* ... ... ...
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* x:y y+1 use entry [y & (indices-1)]
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* ... ... ...
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* 0xffff 0x10000 use entry [indices-1]
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*/
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#define NO_DEFAULT_INDEX (1 << 16)
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struct mask_value {
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u8 mask;
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u8 value;
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};
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struct dsmark_qdisc_data {
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struct Qdisc *q;
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struct tcf_proto __rcu *filter_list;
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struct mask_value *mv;
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u16 indices;
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u8 set_tc_index;
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u32 default_index; /* index range is 0...0xffff */
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#define DSMARK_EMBEDDED_SZ 16
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struct mask_value embedded[DSMARK_EMBEDDED_SZ];
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};
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static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
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{
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return index <= p->indices && index > 0;
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}
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/* ------------------------- Class/flow operations ------------------------- */
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static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
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struct Qdisc *new, struct Qdisc **old)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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pr_debug("%s(sch %p,[qdisc %p],new %p,old %p)\n",
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__func__, sch, p, new, old);
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if (new == NULL) {
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new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
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sch->handle);
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if (new == NULL)
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new = &noop_qdisc;
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}
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*old = qdisc_replace(sch, new, &p->q);
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return 0;
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}
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static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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return p->q;
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}
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static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
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{
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pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
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__func__, sch, qdisc_priv(sch), classid);
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return TC_H_MIN(classid) + 1;
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}
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static unsigned long dsmark_bind_filter(struct Qdisc *sch,
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unsigned long parent, u32 classid)
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{
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return dsmark_get(sch, classid);
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}
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static void dsmark_put(struct Qdisc *sch, unsigned long cl)
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{
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}
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static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
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[TCA_DSMARK_INDICES] = { .type = NLA_U16 },
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[TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 },
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[TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG },
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[TCA_DSMARK_MASK] = { .type = NLA_U8 },
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[TCA_DSMARK_VALUE] = { .type = NLA_U8 },
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};
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static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
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struct nlattr **tca, unsigned long *arg)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_DSMARK_MAX + 1];
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int err = -EINVAL;
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pr_debug("%s(sch %p,[qdisc %p],classid %x,parent %x), arg 0x%lx\n",
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__func__, sch, p, classid, parent, *arg);
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if (!dsmark_valid_index(p, *arg)) {
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err = -ENOENT;
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goto errout;
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}
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if (!opt)
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goto errout;
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err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
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if (err < 0)
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goto errout;
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if (tb[TCA_DSMARK_VALUE])
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p->mv[*arg - 1].value = nla_get_u8(tb[TCA_DSMARK_VALUE]);
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if (tb[TCA_DSMARK_MASK])
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p->mv[*arg - 1].mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
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err = 0;
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errout:
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return err;
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}
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static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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if (!dsmark_valid_index(p, arg))
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return -EINVAL;
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p->mv[arg - 1].mask = 0xff;
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p->mv[arg - 1].value = 0;
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return 0;
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}
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static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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int i;
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pr_debug("%s(sch %p,[qdisc %p],walker %p)\n",
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__func__, sch, p, walker);
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if (walker->stop)
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return;
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for (i = 0; i < p->indices; i++) {
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if (p->mv[i].mask == 0xff && !p->mv[i].value)
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goto ignore;
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if (walker->count >= walker->skip) {
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if (walker->fn(sch, i + 1, walker) < 0) {
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walker->stop = 1;
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break;
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}
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}
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ignore:
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walker->count++;
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}
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}
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static inline struct tcf_proto __rcu **dsmark_find_tcf(struct Qdisc *sch,
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unsigned long cl)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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return &p->filter_list;
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}
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/* --------------------------- Qdisc operations ---------------------------- */
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static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch,
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struct sk_buff **to_free)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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int err;
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pr_debug("%s(skb %p,sch %p,[qdisc %p])\n", __func__, skb, sch, p);
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if (p->set_tc_index) {
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int wlen = skb_network_offset(skb);
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switch (tc_skb_protocol(skb)) {
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case htons(ETH_P_IP):
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wlen += sizeof(struct iphdr);
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if (!pskb_may_pull(skb, wlen) ||
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skb_try_make_writable(skb, wlen))
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goto drop;
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skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
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& ~INET_ECN_MASK;
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break;
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case htons(ETH_P_IPV6):
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wlen += sizeof(struct ipv6hdr);
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if (!pskb_may_pull(skb, wlen) ||
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skb_try_make_writable(skb, wlen))
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goto drop;
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skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
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& ~INET_ECN_MASK;
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break;
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default:
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skb->tc_index = 0;
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break;
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}
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}
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if (TC_H_MAJ(skb->priority) == sch->handle)
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skb->tc_index = TC_H_MIN(skb->priority);
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else {
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struct tcf_result res;
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struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
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int result = tc_classify(skb, fl, &res, false);
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pr_debug("result %d class 0x%04x\n", result, res.classid);
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switch (result) {
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#ifdef CONFIG_NET_CLS_ACT
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case TC_ACT_QUEUED:
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case TC_ACT_STOLEN:
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__qdisc_drop(skb, to_free);
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return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
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case TC_ACT_SHOT:
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goto drop;
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#endif
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case TC_ACT_OK:
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skb->tc_index = TC_H_MIN(res.classid);
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break;
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default:
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if (p->default_index != NO_DEFAULT_INDEX)
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skb->tc_index = p->default_index;
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break;
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}
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}
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err = qdisc_enqueue(skb, p->q, to_free);
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if (err != NET_XMIT_SUCCESS) {
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if (net_xmit_drop_count(err))
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qdisc_qstats_drop(sch);
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return err;
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}
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qdisc_qstats_backlog_inc(sch, skb);
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sch->q.qlen++;
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return NET_XMIT_SUCCESS;
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drop:
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qdisc_drop(skb, sch, to_free);
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return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
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}
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static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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struct sk_buff *skb;
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u32 index;
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pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
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skb = qdisc_dequeue_peeked(p->q);
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if (skb == NULL)
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return NULL;
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qdisc_bstats_update(sch, skb);
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qdisc_qstats_backlog_dec(sch, skb);
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sch->q.qlen--;
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index = skb->tc_index & (p->indices - 1);
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pr_debug("index %d->%d\n", skb->tc_index, index);
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switch (tc_skb_protocol(skb)) {
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case htons(ETH_P_IP):
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ipv4_change_dsfield(ip_hdr(skb), p->mv[index].mask,
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p->mv[index].value);
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break;
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case htons(ETH_P_IPV6):
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ipv6_change_dsfield(ipv6_hdr(skb), p->mv[index].mask,
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p->mv[index].value);
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break;
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default:
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/*
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* Only complain if a change was actually attempted.
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* This way, we can send non-IP traffic through dsmark
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* and don't need yet another qdisc as a bypass.
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*/
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if (p->mv[index].mask != 0xff || p->mv[index].value)
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pr_warn("%s: unsupported protocol %d\n",
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__func__, ntohs(tc_skb_protocol(skb)));
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break;
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}
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return skb;
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}
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static struct sk_buff *dsmark_peek(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
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return p->q->ops->peek(p->q);
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}
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static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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struct nlattr *tb[TCA_DSMARK_MAX + 1];
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int err = -EINVAL;
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u32 default_index = NO_DEFAULT_INDEX;
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u16 indices;
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int i;
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pr_debug("%s(sch %p,[qdisc %p],opt %p)\n", __func__, sch, p, opt);
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if (!opt)
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goto errout;
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err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
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if (err < 0)
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goto errout;
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err = -EINVAL;
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if (!tb[TCA_DSMARK_INDICES])
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goto errout;
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indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
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if (hweight32(indices) != 1)
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goto errout;
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if (tb[TCA_DSMARK_DEFAULT_INDEX])
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default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
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if (indices <= DSMARK_EMBEDDED_SZ)
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p->mv = p->embedded;
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else
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p->mv = kmalloc_array(indices, sizeof(*p->mv), GFP_KERNEL);
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if (!p->mv) {
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err = -ENOMEM;
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goto errout;
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}
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for (i = 0; i < indices; i++) {
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p->mv[i].mask = 0xff;
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p->mv[i].value = 0;
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}
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p->indices = indices;
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p->default_index = default_index;
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p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
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p->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, sch->handle);
|
||
|
|
if (p->q == NULL)
|
||
|
|
p->q = &noop_qdisc;
|
||
|
|
|
||
|
|
pr_debug("%s: qdisc %p\n", __func__, p->q);
|
||
|
|
|
||
|
|
err = 0;
|
||
|
|
errout:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void dsmark_reset(struct Qdisc *sch)
|
||
|
|
{
|
||
|
|
struct dsmark_qdisc_data *p = qdisc_priv(sch);
|
||
|
|
|
||
|
|
pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
|
||
|
|
qdisc_reset(p->q);
|
||
|
|
sch->qstats.backlog = 0;
|
||
|
|
sch->q.qlen = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void dsmark_destroy(struct Qdisc *sch)
|
||
|
|
{
|
||
|
|
struct dsmark_qdisc_data *p = qdisc_priv(sch);
|
||
|
|
|
||
|
|
pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
|
||
|
|
|
||
|
|
tcf_destroy_chain(&p->filter_list);
|
||
|
|
qdisc_destroy(p->q);
|
||
|
|
if (p->mv != p->embedded)
|
||
|
|
kfree(p->mv);
|
||
|
|
}
|
||
|
|
|
||
|
|
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("%s(sch %p,[qdisc %p],class %ld\n", __func__, 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->mv[cl - 1].mask) ||
|
||
|
|
nla_put_u8(skb, TCA_DSMARK_VALUE, p->mv[cl - 1].value))
|
||
|
|
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,
|
||
|
|
.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");
|