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![Eric Dumazet](/assets/img/avatar_default.png)
Use qdisc_drop() helper where possible. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
512 lines
11 KiB
C
512 lines
11 KiB
C
/* 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 dsmark_qdisc_data {
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struct Qdisc *q;
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struct tcf_proto *filter_list;
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u8 *mask; /* "owns" the array */
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u8 *value;
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u16 indices;
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u32 default_index; /* index range is 0...0xffff */
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int set_tc_index;
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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("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
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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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sch_tree_lock(sch);
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*old = p->q;
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p->q = new;
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qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
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qdisc_reset(*old);
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sch_tree_unlock(sch);
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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("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
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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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u8 mask = 0;
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pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
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"arg 0x%lx\n", 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_MASK])
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mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
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if (tb[TCA_DSMARK_VALUE])
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p->value[*arg - 1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
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if (tb[TCA_DSMARK_MASK])
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p->mask[*arg - 1] = 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->mask[arg - 1] = 0xff;
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p->value[arg - 1] = 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("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", 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->mask[i] == 0xff && !p->value[i])
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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 **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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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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int err;
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pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
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if (p->set_tc_index) {
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switch (skb->protocol) {
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case htons(ETH_P_IP):
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if (skb_cow_head(skb, sizeof(struct iphdr)))
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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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if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
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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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int result = tc_classify(skb, p->filter_list, &res);
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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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kfree_skb(skb);
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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);
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if (err != NET_XMIT_SUCCESS) {
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if (net_xmit_drop_count(err))
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sch->qstats.drops++;
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return err;
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}
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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);
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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("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
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skb = p->q->ops->dequeue(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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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 (skb->protocol) {
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case htons(ETH_P_IP):
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ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
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p->value[index]);
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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->mask[index],
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p->value[index]);
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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->mask[index] != 0xff || p->value[index])
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pr_warning("dsmark_dequeue: unsupported protocol %d\n",
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ntohs(skb->protocol));
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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("dsmark_peek(sch %p,[qdisc %p])\n", sch, p);
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return p->q->ops->peek(p->q);
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}
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static unsigned int dsmark_drop(struct Qdisc *sch)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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unsigned int len;
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pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
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if (p->q->ops->drop == NULL)
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return 0;
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len = p->q->ops->drop(p->q);
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if (len)
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sch->q.qlen--;
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return len;
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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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u8 *mask;
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pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", 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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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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mask = kmalloc(indices * 2, GFP_KERNEL);
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if (mask == NULL) {
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err = -ENOMEM;
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goto errout;
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}
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p->mask = mask;
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memset(p->mask, 0xff, indices);
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p->value = p->mask + indices;
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memset(p->value, 0, indices);
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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);
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if (p->q == NULL)
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p->q = &noop_qdisc;
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pr_debug("dsmark_init: qdisc %p\n", p->q);
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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 void dsmark_reset(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("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
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qdisc_reset(p->q);
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sch->q.qlen = 0;
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}
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static void dsmark_destroy(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("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
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tcf_destroy_chain(&p->filter_list);
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qdisc_destroy(p->q);
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kfree(p->mask);
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}
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static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
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struct sk_buff *skb, struct tcmsg *tcm)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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struct nlattr *opts = NULL;
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pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
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if (!dsmark_valid_index(p, cl))
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return -EINVAL;
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tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl - 1);
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tcm->tcm_info = p->q->handle;
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opts = nla_nest_start(skb, TCA_OPTIONS);
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if (opts == NULL)
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goto nla_put_failure;
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if (nla_put_u8(skb, TCA_DSMARK_MASK, p->mask[cl - 1]) ||
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nla_put_u8(skb, TCA_DSMARK_VALUE, p->value[cl - 1]))
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goto nla_put_failure;
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return nla_nest_end(skb, opts);
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nla_put_failure:
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nla_nest_cancel(skb, opts);
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return -EMSGSIZE;
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}
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static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
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{
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struct dsmark_qdisc_data *p = qdisc_priv(sch);
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struct nlattr *opts = NULL;
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opts = nla_nest_start(skb, TCA_OPTIONS);
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if (opts == NULL)
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goto nla_put_failure;
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if (nla_put_u16(skb, TCA_DSMARK_INDICES, p->indices))
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goto nla_put_failure;
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if (p->default_index != NO_DEFAULT_INDEX &&
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nla_put_u16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index))
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goto nla_put_failure;
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if (p->set_tc_index &&
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nla_put_flag(skb, TCA_DSMARK_SET_TC_INDEX))
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goto nla_put_failure;
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return nla_nest_end(skb, opts);
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nla_put_failure:
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nla_nest_cancel(skb, opts);
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return -EMSGSIZE;
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}
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static const struct Qdisc_class_ops dsmark_class_ops = {
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.graft = dsmark_graft,
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.leaf = dsmark_leaf,
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.get = dsmark_get,
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.put = dsmark_put,
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.change = dsmark_change,
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.delete = dsmark_delete,
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.walk = dsmark_walk,
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.tcf_chain = dsmark_find_tcf,
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.bind_tcf = dsmark_bind_filter,
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.unbind_tcf = dsmark_put,
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.dump = dsmark_dump_class,
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};
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static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
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.next = NULL,
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.cl_ops = &dsmark_class_ops,
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.id = "dsmark",
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.priv_size = sizeof(struct dsmark_qdisc_data),
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.enqueue = dsmark_enqueue,
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.dequeue = dsmark_dequeue,
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.peek = dsmark_peek,
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.drop = dsmark_drop,
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.init = dsmark_init,
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.reset = dsmark_reset,
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.destroy = dsmark_destroy,
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.change = NULL,
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.dump = dsmark_dump,
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.owner = THIS_MODULE,
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};
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static int __init dsmark_module_init(void)
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{
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return register_qdisc(&dsmark_qdisc_ops);
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}
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static void __exit dsmark_module_exit(void)
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{
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unregister_qdisc(&dsmark_qdisc_ops);
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}
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module_init(dsmark_module_init)
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module_exit(dsmark_module_exit)
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MODULE_LICENSE("GPL");
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