blob: 66700a6116aa98332e4996366378a633b9da552a [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* net/sched/sch_dsmark.c - Differentiated Services field marker */
2
3/* Written 1998-2000 by Werner Almesberger, EPFL ICA */
4
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/module.h>
7#include <linux/init.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09008#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07009#include <linux/types.h>
10#include <linux/string.h>
11#include <linux/errno.h>
12#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#include <linux/rtnetlink.h>
David S. Miller5b0ac722008-01-21 02:21:45 -080014#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <net/pkt_sched.h>
16#include <net/dsfield.h>
17#include <net/inet_ecn.h>
18#include <asm/byteorder.h>
19
Linus Torvalds1da177e2005-04-16 15:20:36 -070020/*
21 * classid class marking
22 * ------- ----- -------
23 * n/a 0 n/a
24 * x:0 1 use entry [0]
25 * ... ... ...
26 * x:y y>0 y+1 use entry [y]
27 * ... ... ...
28 * x:indices-1 indices use entry [indices-1]
29 * ... ... ...
30 * x:y y+1 use entry [y & (indices-1)]
31 * ... ... ...
32 * 0xffff 0x10000 use entry [indices-1]
33 */
34
35
36#define NO_DEFAULT_INDEX (1 << 16)
37
38struct dsmark_qdisc_data {
39 struct Qdisc *q;
John Fastabend25d8c0d2014-09-12 20:05:27 -070040 struct tcf_proto __rcu *filter_list;
Thomas Grafaf0d1142005-06-18 22:53:29 -070041 u8 *mask; /* "owns" the array */
42 u8 *value;
43 u16 indices;
44 u32 default_index; /* index range is 0...0xffff */
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 int set_tc_index;
46};
47
Thomas Graf758cc432005-06-18 22:52:54 -070048static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
49{
Yang Yingliang17569fa2013-12-10 20:55:29 +080050 return index <= p->indices && index > 0;
Thomas Graf758cc432005-06-18 22:52:54 -070051}
Linus Torvalds1da177e2005-04-16 15:20:36 -070052
53/* ------------------------- Class/flow operations ------------------------- */
54
Thomas Grafaf0d1142005-06-18 22:53:29 -070055static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
56 struct Qdisc *new, struct Qdisc **old)
Linus Torvalds1da177e2005-04-16 15:20:36 -070057{
Stephen Hemminger81da99e2008-01-21 00:50:09 -080058 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -070059
Yang Yingliangc76f2a22013-12-23 17:39:00 +080060 pr_debug("%s(sch %p,[qdisc %p],new %p,old %p)\n",
61 __func__, sch, p, new, old);
Thomas Graf486b53e2005-05-31 15:16:52 -070062
63 if (new == NULL) {
Changli Gao3511c912010-10-16 13:04:08 +000064 new = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops,
Patrick McHardy9f9afec2006-11-29 17:35:18 -080065 sch->handle);
Thomas Graf486b53e2005-05-31 15:16:52 -070066 if (new == NULL)
67 new = &noop_qdisc;
68 }
69
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 sch_tree_lock(sch);
Patrick McHardyb94c8af2008-11-20 04:11:36 -080071 *old = p->q;
72 p->q = new;
Patrick McHardy5e50da02006-11-29 17:36:20 -080073 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
Thomas Grafaf0d1142005-06-18 22:53:29 -070074 qdisc_reset(*old);
Thomas Grafaf0d1142005-06-18 22:53:29 -070075 sch_tree_unlock(sch);
76
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090077 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078}
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
81{
Stephen Hemminger81da99e2008-01-21 00:50:09 -080082 struct dsmark_qdisc_data *p = qdisc_priv(sch);
83 return p->q;
Linus Torvalds1da177e2005-04-16 15:20:36 -070084}
85
Thomas Grafaf0d1142005-06-18 22:53:29 -070086static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070087{
Yang Yingliangc76f2a22013-12-23 17:39:00 +080088 pr_debug("%s(sch %p,[qdisc %p],classid %x)\n",
89 __func__, sch, qdisc_priv(sch), classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
Thomas Grafaf0d1142005-06-18 22:53:29 -070091 return TC_H_MIN(classid) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092}
93
Linus Torvalds1da177e2005-04-16 15:20:36 -070094static unsigned long dsmark_bind_filter(struct Qdisc *sch,
Thomas Grafaf0d1142005-06-18 22:53:29 -070095 unsigned long parent, u32 classid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Thomas Grafaf0d1142005-06-18 22:53:29 -070097 return dsmark_get(sch, classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070098}
99
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100static void dsmark_put(struct Qdisc *sch, unsigned long cl)
101{
102}
103
Patrick McHardy27a34212008-01-23 20:35:39 -0800104static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
105 [TCA_DSMARK_INDICES] = { .type = NLA_U16 },
106 [TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 },
107 [TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG },
108 [TCA_DSMARK_MASK] = { .type = NLA_U8 },
109 [TCA_DSMARK_VALUE] = { .type = NLA_U8 },
110};
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
Patrick McHardy1e904742008-01-22 22:11:17 -0800113 struct nlattr **tca, unsigned long *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800115 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800116 struct nlattr *opt = tca[TCA_OPTIONS];
117 struct nlattr *tb[TCA_DSMARK_MAX + 1];
Thomas Graf758cc432005-06-18 22:52:54 -0700118 int err = -EINVAL;
119 u8 mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800121 pr_debug("%s(sch %p,[qdisc %p],classid %x,parent %x), arg 0x%lx\n",
122 __func__, sch, p, classid, parent, *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
Thomas Graf758cc432005-06-18 22:52:54 -0700124 if (!dsmark_valid_index(p, *arg)) {
125 err = -ENOENT;
Patrick McHardy1e904742008-01-22 22:11:17 -0800126 goto errout;
Thomas Graf758cc432005-06-18 22:52:54 -0700127 }
128
Patrick McHardycee63722008-01-23 20:33:32 -0800129 if (!opt)
Patrick McHardy1e904742008-01-22 22:11:17 -0800130 goto errout;
Thomas Graf758cc432005-06-18 22:52:54 -0700131
Patrick McHardy27a34212008-01-23 20:35:39 -0800132 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800133 if (err < 0)
Patrick McHardy27a34212008-01-23 20:35:39 -0800134 goto errout;
Patrick McHardycee63722008-01-23 20:33:32 -0800135
Patrick McHardy27a34212008-01-23 20:35:39 -0800136 if (tb[TCA_DSMARK_MASK])
Patrick McHardy1e904742008-01-22 22:11:17 -0800137 mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
Patrick McHardy27a34212008-01-23 20:35:39 -0800138
139 if (tb[TCA_DSMARK_VALUE])
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000140 p->value[*arg - 1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
Thomas Graf758cc432005-06-18 22:52:54 -0700141
Patrick McHardy1e904742008-01-22 22:11:17 -0800142 if (tb[TCA_DSMARK_MASK])
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000143 p->mask[*arg - 1] = mask;
Thomas Graf758cc432005-06-18 22:52:54 -0700144
145 err = 0;
146
Patrick McHardy1e904742008-01-22 22:11:17 -0800147errout:
Thomas Graf758cc432005-06-18 22:52:54 -0700148 return err;
149}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
Thomas Grafaf0d1142005-06-18 22:53:29 -0700151static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800153 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Thomas Grafaf0d1142005-06-18 22:53:29 -0700155 if (!dsmark_valid_index(p, arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return -EINVAL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900157
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000158 p->mask[arg - 1] = 0xff;
159 p->value[arg - 1] = 0;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700160
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 return 0;
162}
163
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800164static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800166 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 int i;
168
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800169 pr_debug("%s(sch %p,[qdisc %p],walker %p)\n",
170 __func__, sch, p, walker);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700171
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (walker->stop)
173 return;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 for (i = 0; i < p->indices; i++) {
176 if (p->mask[i] == 0xff && !p->value[i])
Thomas Graf0451eb02005-05-31 15:15:58 -0700177 goto ignore;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 if (walker->count >= walker->skip) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000179 if (walker->fn(sch, i + 1, walker) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 walker->stop = 1;
181 break;
182 }
183 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900184ignore:
Thomas Graf0451eb02005-05-31 15:15:58 -0700185 walker->count++;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900186 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
John Fastabend25d8c0d2014-09-12 20:05:27 -0700189static inline struct tcf_proto __rcu **dsmark_find_tcf(struct Qdisc *sch,
190 unsigned long cl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800192 struct dsmark_qdisc_data *p = qdisc_priv(sch);
193 return &p->filter_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194}
195
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196/* --------------------------- Qdisc operations ---------------------------- */
197
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800198static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800200 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700201 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800203 pr_debug("%s(skb %p,sch %p,[qdisc %p])\n", __func__, skb, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 if (p->set_tc_index) {
Jiri Pirkod8b96052015-01-13 17:13:43 +0100206 switch (tc_skb_protocol(skb)) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700207 case htons(ETH_P_IP):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800208 if (skb_cow_head(skb, sizeof(struct iphdr)))
209 goto drop;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800210
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800211 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
212 & ~INET_ECN_MASK;
213 break;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800214
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700215 case htons(ETH_P_IPV6):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800216 if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
217 goto drop;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800218
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800219 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
220 & ~INET_ECN_MASK;
221 break;
222 default:
223 skb->tc_index = 0;
224 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700225 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700227
228 if (TC_H_MAJ(skb->priority) == sch->handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 skb->tc_index = TC_H_MIN(skb->priority);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700230 else {
231 struct tcf_result res;
John Fastabend25d8c0d2014-09-12 20:05:27 -0700232 struct tcf_proto *fl = rcu_dereference_bh(p->filter_list);
233 int result = tc_classify(skb, fl, &res);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700234
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800235 pr_debug("result %d class 0x%04x\n", result, res.classid);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 switch (result) {
Patrick McHardyf6853e22007-07-15 00:02:10 -0700238#ifdef CONFIG_NET_CLS_ACT
239 case TC_ACT_QUEUED:
240 case TC_ACT_STOLEN:
241 kfree_skb(skb);
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700242 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800243
Patrick McHardyf6853e22007-07-15 00:02:10 -0700244 case TC_ACT_SHOT:
Stephen Hemminger4c307192008-01-21 02:23:49 -0800245 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246#endif
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700247 case TC_ACT_OK:
Patrick McHardyf6853e22007-07-15 00:02:10 -0700248 skb->tc_index = TC_H_MIN(res.classid);
249 break;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800250
Patrick McHardyf6853e22007-07-15 00:02:10 -0700251 default:
252 if (p->default_index != NO_DEFAULT_INDEX)
253 skb->tc_index = p->default_index;
254 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700255 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700258 err = qdisc_enqueue(skb, p->q);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700259 if (err != NET_XMIT_SUCCESS) {
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700260 if (net_xmit_drop_count(err))
John Fastabend25331d62014-09-28 11:53:29 -0700261 qdisc_qstats_drop(sch);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700262 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700264
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 sch->q.qlen++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
Thomas Grafaf0d1142005-06-18 22:53:29 -0700267 return NET_XMIT_SUCCESS;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800268
269drop:
Eric Dumazet17045752012-05-04 04:37:21 +0000270 qdisc_drop(skb, sch);
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700271 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700272}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
275{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800276 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 struct sk_buff *skb;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700278 u32 index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800280 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700281
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 skb = p->q->ops->dequeue(p->q);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700283 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 return NULL;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700285
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800286 qdisc_bstats_update(sch, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 sch->q.qlen--;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700288
289 index = skb->tc_index & (p->indices - 1);
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800290 pr_debug("index %d->%d\n", skb->tc_index, index);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700291
Jiri Pirkod8b96052015-01-13 17:13:43 +0100292 switch (tc_skb_protocol(skb)) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700293 case htons(ETH_P_IP):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800294 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
295 p->value[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700297 case htons(ETH_P_IPV6):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800298 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
299 p->value[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 break;
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800301 default:
302 /*
303 * Only complain if a change was actually attempted.
304 * This way, we can send non-IP traffic through dsmark
305 * and don't need yet another qdisc as a bypass.
306 */
307 if (p->mask[index] != 0xff || p->value[index])
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800308 pr_warn("%s: unsupported protocol %d\n",
Jiri Pirkod8b96052015-01-13 17:13:43 +0100309 __func__, ntohs(tc_skb_protocol(skb)));
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800310 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700311 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 return skb;
314}
315
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700316static struct sk_buff *dsmark_peek(struct Qdisc *sch)
317{
318 struct dsmark_qdisc_data *p = qdisc_priv(sch);
319
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800320 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700321
322 return p->q->ops->peek(p->q);
323}
324
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325static unsigned int dsmark_drop(struct Qdisc *sch)
326{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800327 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 unsigned int len;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900329
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800330 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700331
332 if (p->q->ops->drop == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 return 0;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700334
335 len = p->q->ops->drop(p->q);
336 if (len)
337 sch->q.qlen--;
338
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 return len;
340}
341
Patrick McHardy1e904742008-01-22 22:11:17 -0800342static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800344 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800345 struct nlattr *tb[TCA_DSMARK_MAX + 1];
Thomas Graf758cc432005-06-18 22:52:54 -0700346 int err = -EINVAL;
347 u32 default_index = NO_DEFAULT_INDEX;
348 u16 indices;
349 u8 *mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800351 pr_debug("%s(sch %p,[qdisc %p],opt %p)\n", __func__, sch, p, opt);
Thomas Graf758cc432005-06-18 22:52:54 -0700352
Patrick McHardycee63722008-01-23 20:33:32 -0800353 if (!opt)
Thomas Graf758cc432005-06-18 22:52:54 -0700354 goto errout;
355
Patrick McHardy27a34212008-01-23 20:35:39 -0800356 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800357 if (err < 0)
358 goto errout;
359
360 err = -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800361 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
David S. Miller5b0ac722008-01-21 02:21:45 -0800362
363 if (hweight32(indices) != 1)
Thomas Graf758cc432005-06-18 22:52:54 -0700364 goto errout;
365
Patrick McHardy27a34212008-01-23 20:35:39 -0800366 if (tb[TCA_DSMARK_DEFAULT_INDEX])
Patrick McHardy1e904742008-01-22 22:11:17 -0800367 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
Thomas Graf758cc432005-06-18 22:52:54 -0700368
369 mask = kmalloc(indices * 2, GFP_KERNEL);
370 if (mask == NULL) {
371 err = -ENOMEM;
372 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
Thomas Graf758cc432005-06-18 22:52:54 -0700374
375 p->mask = mask;
376 memset(p->mask, 0xff, indices);
377
378 p->value = p->mask + indices;
379 memset(p->value, 0, indices);
380
381 p->indices = indices;
382 p->default_index = default_index;
Patrick McHardy1e904742008-01-22 22:11:17 -0800383 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
Thomas Graf758cc432005-06-18 22:52:54 -0700384
Changli Gao3511c912010-10-16 13:04:08 +0000385 p->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, sch->handle);
Thomas Graf758cc432005-06-18 22:52:54 -0700386 if (p->q == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 p->q = &noop_qdisc;
Thomas Graf758cc432005-06-18 22:52:54 -0700388
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800389 pr_debug("%s: qdisc %p\n", __func__, p->q);
Thomas Graf758cc432005-06-18 22:52:54 -0700390
391 err = 0;
392errout:
Thomas Graf758cc432005-06-18 22:52:54 -0700393 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394}
395
Linus Torvalds1da177e2005-04-16 15:20:36 -0700396static void dsmark_reset(struct Qdisc *sch)
397{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800398 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800400 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 qdisc_reset(p->q);
402 sch->q.qlen = 0;
403}
404
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405static void dsmark_destroy(struct Qdisc *sch)
406{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800407 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800409 pr_debug("%s(sch %p,[qdisc %p])\n", __func__, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700410
Patrick McHardyff31ab52008-07-01 19:52:38 -0700411 tcf_destroy_chain(&p->filter_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 qdisc_destroy(p->q);
413 kfree(p->mask);
414}
415
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
Thomas Graf02f23f02005-06-18 22:53:12 -0700417 struct sk_buff *skb, struct tcmsg *tcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800419 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800420 struct nlattr *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Yang Yingliangc76f2a22013-12-23 17:39:00 +0800422 pr_debug("%s(sch %p,[qdisc %p],class %ld\n", __func__, sch, p, cl);
Thomas Graf02f23f02005-06-18 22:53:12 -0700423
424 if (!dsmark_valid_index(p, cl))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425 return -EINVAL;
Thomas Graf02f23f02005-06-18 22:53:12 -0700426
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000427 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl - 1);
Patrick McHardycdc7f8e2006-03-20 19:01:06 -0800428 tcm->tcm_info = p->q->handle;
Thomas Graf02f23f02005-06-18 22:53:12 -0700429
Patrick McHardy1e904742008-01-22 22:11:17 -0800430 opts = nla_nest_start(skb, TCA_OPTIONS);
431 if (opts == NULL)
432 goto nla_put_failure;
David S. Miller1b34ec42012-03-29 05:11:39 -0400433 if (nla_put_u8(skb, TCA_DSMARK_MASK, p->mask[cl - 1]) ||
434 nla_put_u8(skb, TCA_DSMARK_VALUE, p->value[cl - 1]))
435 goto nla_put_failure;
Thomas Graf02f23f02005-06-18 22:53:12 -0700436
Patrick McHardy1e904742008-01-22 22:11:17 -0800437 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438
Patrick McHardy1e904742008-01-22 22:11:17 -0800439nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700440 nla_nest_cancel(skb, opts);
441 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442}
443
444static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
445{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800446 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800447 struct nlattr *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448
Patrick McHardy1e904742008-01-22 22:11:17 -0800449 opts = nla_nest_start(skb, TCA_OPTIONS);
450 if (opts == NULL)
451 goto nla_put_failure;
David S. Miller1b34ec42012-03-29 05:11:39 -0400452 if (nla_put_u16(skb, TCA_DSMARK_INDICES, p->indices))
453 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454
David S. Miller1b34ec42012-03-29 05:11:39 -0400455 if (p->default_index != NO_DEFAULT_INDEX &&
456 nla_put_u16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index))
457 goto nla_put_failure;
Thomas Graf02f23f02005-06-18 22:53:12 -0700458
David S. Miller1b34ec42012-03-29 05:11:39 -0400459 if (p->set_tc_index &&
460 nla_put_flag(skb, TCA_DSMARK_SET_TC_INDEX))
461 goto nla_put_failure;
Thomas Graf02f23f02005-06-18 22:53:12 -0700462
Patrick McHardy1e904742008-01-22 22:11:17 -0800463 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Patrick McHardy1e904742008-01-22 22:11:17 -0800465nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700466 nla_nest_cancel(skb, opts);
467 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468}
469
Eric Dumazet20fea082007-11-14 01:44:41 -0800470static const struct Qdisc_class_ops dsmark_class_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 .graft = dsmark_graft,
472 .leaf = dsmark_leaf,
473 .get = dsmark_get,
474 .put = dsmark_put,
475 .change = dsmark_change,
476 .delete = dsmark_delete,
477 .walk = dsmark_walk,
478 .tcf_chain = dsmark_find_tcf,
479 .bind_tcf = dsmark_bind_filter,
480 .unbind_tcf = dsmark_put,
481 .dump = dsmark_dump_class,
482};
483
Eric Dumazet20fea082007-11-14 01:44:41 -0800484static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 .next = NULL,
486 .cl_ops = &dsmark_class_ops,
487 .id = "dsmark",
488 .priv_size = sizeof(struct dsmark_qdisc_data),
489 .enqueue = dsmark_enqueue,
490 .dequeue = dsmark_dequeue,
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700491 .peek = dsmark_peek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 .drop = dsmark_drop,
493 .init = dsmark_init,
494 .reset = dsmark_reset,
495 .destroy = dsmark_destroy,
496 .change = NULL,
497 .dump = dsmark_dump,
498 .owner = THIS_MODULE,
499};
500
501static int __init dsmark_module_init(void)
502{
503 return register_qdisc(&dsmark_qdisc_ops);
504}
Thomas Grafaf0d1142005-06-18 22:53:29 -0700505
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900506static void __exit dsmark_module_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507{
508 unregister_qdisc(&dsmark_qdisc_ops);
509}
Thomas Grafaf0d1142005-06-18 22:53:29 -0700510
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511module_init(dsmark_module_init)
512module_exit(dsmark_module_exit)
Thomas Grafaf0d1142005-06-18 22:53:29 -0700513
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514MODULE_LICENSE("GPL");