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523 lines
12 KiB
523 lines
12 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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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/pkt_cls.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 tcf_block *block; |
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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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struct netlink_ext_ack *extack) |
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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, NULL); |
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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_find(struct Qdisc *sch, u32 classid) |
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{ |
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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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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 dsmark_find(sch, classid); |
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} |
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static void dsmark_unbind_filter(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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struct netlink_ext_ack *extack) |
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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_deprecated(tb, TCA_DSMARK_MAX, opt, |
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dsmark_policy, NULL); |
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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 struct tcf_block *dsmark_tcf_block(struct Qdisc *sch, unsigned long cl, |
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struct netlink_ext_ack *extack) |
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{ |
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struct dsmark_qdisc_data *p = qdisc_priv(sch); |
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return p->block; |
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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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unsigned int len = qdisc_pkt_len(skb); |
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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 (skb_protocol(skb, true)) { |
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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 = tcf_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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case TC_ACT_TRAP: |
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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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sch->qstats.backlog += len; |
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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 (skb_protocol(skb, true)) { |
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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(skb_protocol(skb, true))); |
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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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struct netlink_ext_ack *extack) |
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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 = tcf_block_get(&p->block, &p->filter_list, sch, extack); |
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if (err) |
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return err; |
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err = nla_parse_nested_deprecated(tb, TCA_DSMARK_MAX, opt, |
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dsmark_policy, NULL); |
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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, |
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NULL); |
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if (p->q == NULL) |
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p->q = &noop_qdisc; |
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else |
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qdisc_hash_add(p->q, true); |
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pr_debug("%s: qdisc %p\n", __func__, 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("%s(sch %p,[qdisc %p])\n", __func__, sch, p); |
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if (p->q) |
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qdisc_reset(p->q); |
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sch->qstats.backlog = 0; |
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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("%s(sch %p,[qdisc %p])\n", __func__, sch, p); |
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tcf_block_put(p->block); |
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qdisc_put(p->q); |
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if (p->mv != p->embedded) |
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kfree(p->mv); |
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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("%s(sch %p,[qdisc %p],class %ld\n", __func__, 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_noflag(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->mv[cl - 1].mask) || |
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nla_put_u8(skb, TCA_DSMARK_VALUE, p->mv[cl - 1].value)) |
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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_noflag(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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.find = dsmark_find, |
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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_block = dsmark_tcf_block, |
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.bind_tcf = dsmark_bind_filter, |
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.unbind_tcf = dsmark_unbind_filter, |
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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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.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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