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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;
40 struct tcf_proto *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{
50 return (index <= p->indices && index > 0);
51}
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
Stephen Hemminger81da99e2008-01-21 00:50:09 -080060 pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
Thomas Grafaf0d1142005-06-18 22:53:29 -070061 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{
Stephen Hemminger81da99e2008-01-21 00:50:09 -080088 pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
89 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
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800121 pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
Thomas Graf758cc432005-06-18 22:52:54 -0700122 "arg 0x%lx\n", 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
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800169 pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 if (walker->stop)
172 return;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 for (i = 0; i < p->indices; i++) {
175 if (p->mask[i] == 0xff && !p->value[i])
Thomas Graf0451eb02005-05-31 15:15:58 -0700176 goto ignore;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (walker->count >= walker->skip) {
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000178 if (walker->fn(sch, i + 1, walker) < 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 walker->stop = 1;
180 break;
181 }
182 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900183ignore:
Thomas Graf0451eb02005-05-31 15:15:58 -0700184 walker->count++;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900185 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800188static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
189 unsigned long cl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800191 struct dsmark_qdisc_data *p = qdisc_priv(sch);
192 return &p->filter_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193}
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195/* --------------------------- Qdisc operations ---------------------------- */
196
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800197static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800199 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700200 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800202 pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (p->set_tc_index) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700206 case htons(ETH_P_IP):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800207 if (skb_cow_head(skb, sizeof(struct iphdr)))
208 goto drop;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800209
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800210 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
211 & ~INET_ECN_MASK;
212 break;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800213
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700214 case htons(ETH_P_IPV6):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800215 if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
216 goto drop;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800217
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800218 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
219 & ~INET_ECN_MASK;
220 break;
221 default:
222 skb->tc_index = 0;
223 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700224 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700226
227 if (TC_H_MAJ(skb->priority) == sch->handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 skb->tc_index = TC_H_MIN(skb->priority);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700229 else {
230 struct tcf_result res;
231 int result = tc_classify(skb, p->filter_list, &res);
232
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800233 pr_debug("result %d class 0x%04x\n", result, res.classid);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 switch (result) {
Patrick McHardyf6853e22007-07-15 00:02:10 -0700236#ifdef CONFIG_NET_CLS_ACT
237 case TC_ACT_QUEUED:
238 case TC_ACT_STOLEN:
239 kfree_skb(skb);
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700240 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800241
Patrick McHardyf6853e22007-07-15 00:02:10 -0700242 case TC_ACT_SHOT:
Stephen Hemminger4c307192008-01-21 02:23:49 -0800243 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244#endif
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700245 case TC_ACT_OK:
Patrick McHardyf6853e22007-07-15 00:02:10 -0700246 skb->tc_index = TC_H_MIN(res.classid);
247 break;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800248
Patrick McHardyf6853e22007-07-15 00:02:10 -0700249 default:
250 if (p->default_index != NO_DEFAULT_INDEX)
251 skb->tc_index = p->default_index;
252 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700253 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700256 err = qdisc_enqueue(skb, p->q);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700257 if (err != NET_XMIT_SUCCESS) {
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700258 if (net_xmit_drop_count(err))
259 sch->qstats.drops++;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700260 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700262
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 sch->q.qlen++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
Thomas Grafaf0d1142005-06-18 22:53:29 -0700265 return NET_XMIT_SUCCESS;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800266
267drop:
Eric Dumazet17045752012-05-04 04:37:21 +0000268 qdisc_drop(skb, sch);
Jarek Poplawskic27f3392008-08-04 22:39:11 -0700269 return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700270}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272static struct sk_buff *dsmark_dequeue(struct Qdisc *sch)
273{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800274 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 struct sk_buff *skb;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700276 u32 index;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800278 pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700279
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 skb = p->q->ops->dequeue(p->q);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700281 if (skb == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return NULL;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700283
Eric Dumazet9190b3b2011-01-20 23:31:33 -0800284 qdisc_bstats_update(sch, skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 sch->q.qlen--;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700286
287 index = skb->tc_index & (p->indices - 1);
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800288 pr_debug("index %d->%d\n", skb->tc_index, index);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 switch (skb->protocol) {
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700291 case htons(ETH_P_IP):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800292 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
293 p->value[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 break;
Arnaldo Carvalho de Melo60678042008-09-20 22:20:49 -0700295 case htons(ETH_P_IPV6):
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800296 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
297 p->value[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 break;
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800299 default:
300 /*
301 * Only complain if a change was actually attempted.
302 * This way, we can send non-IP traffic through dsmark
303 * and don't need yet another qdisc as a bypass.
304 */
305 if (p->mask[index] != 0xff || p->value[index])
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000306 pr_warning("dsmark_dequeue: unsupported protocol %d\n",
307 ntohs(skb->protocol));
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800308 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700309 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700310
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 return skb;
312}
313
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700314static struct sk_buff *dsmark_peek(struct Qdisc *sch)
315{
316 struct dsmark_qdisc_data *p = qdisc_priv(sch);
317
318 pr_debug("dsmark_peek(sch %p,[qdisc %p])\n", sch, p);
319
320 return p->q->ops->peek(p->q);
321}
322
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323static unsigned int dsmark_drop(struct Qdisc *sch)
324{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800325 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 unsigned int len;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900327
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800328 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700329
330 if (p->q->ops->drop == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 return 0;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700332
333 len = p->q->ops->drop(p->q);
334 if (len)
335 sch->q.qlen--;
336
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 return len;
338}
339
Patrick McHardy1e904742008-01-22 22:11:17 -0800340static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800342 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800343 struct nlattr *tb[TCA_DSMARK_MAX + 1];
Thomas Graf758cc432005-06-18 22:52:54 -0700344 int err = -EINVAL;
345 u32 default_index = NO_DEFAULT_INDEX;
346 u16 indices;
347 u8 *mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800349 pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
Thomas Graf758cc432005-06-18 22:52:54 -0700350
Patrick McHardycee63722008-01-23 20:33:32 -0800351 if (!opt)
Thomas Graf758cc432005-06-18 22:52:54 -0700352 goto errout;
353
Patrick McHardy27a34212008-01-23 20:35:39 -0800354 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800355 if (err < 0)
356 goto errout;
357
358 err = -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800359 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
David S. Miller5b0ac722008-01-21 02:21:45 -0800360
361 if (hweight32(indices) != 1)
Thomas Graf758cc432005-06-18 22:52:54 -0700362 goto errout;
363
Patrick McHardy27a34212008-01-23 20:35:39 -0800364 if (tb[TCA_DSMARK_DEFAULT_INDEX])
Patrick McHardy1e904742008-01-22 22:11:17 -0800365 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
Thomas Graf758cc432005-06-18 22:52:54 -0700366
367 mask = kmalloc(indices * 2, GFP_KERNEL);
368 if (mask == NULL) {
369 err = -ENOMEM;
370 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 }
Thomas Graf758cc432005-06-18 22:52:54 -0700372
373 p->mask = mask;
374 memset(p->mask, 0xff, indices);
375
376 p->value = p->mask + indices;
377 memset(p->value, 0, indices);
378
379 p->indices = indices;
380 p->default_index = default_index;
Patrick McHardy1e904742008-01-22 22:11:17 -0800381 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
Thomas Graf758cc432005-06-18 22:52:54 -0700382
Changli Gao3511c912010-10-16 13:04:08 +0000383 p->q = qdisc_create_dflt(sch->dev_queue, &pfifo_qdisc_ops, sch->handle);
Thomas Graf758cc432005-06-18 22:52:54 -0700384 if (p->q == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 p->q = &noop_qdisc;
Thomas Graf758cc432005-06-18 22:52:54 -0700386
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800387 pr_debug("dsmark_init: qdisc %p\n", p->q);
Thomas Graf758cc432005-06-18 22:52:54 -0700388
389 err = 0;
390errout:
Thomas Graf758cc432005-06-18 22:52:54 -0700391 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392}
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394static void dsmark_reset(struct Qdisc *sch)
395{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800396 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800398 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 qdisc_reset(p->q);
400 sch->q.qlen = 0;
401}
402
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403static void dsmark_destroy(struct Qdisc *sch)
404{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800405 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800407 pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700408
Patrick McHardyff31ab52008-07-01 19:52:38 -0700409 tcf_destroy_chain(&p->filter_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 qdisc_destroy(p->q);
411 kfree(p->mask);
412}
413
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
Thomas Graf02f23f02005-06-18 22:53:12 -0700415 struct sk_buff *skb, struct tcmsg *tcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800417 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800418 struct nlattr *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800420 pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
Thomas Graf02f23f02005-06-18 22:53:12 -0700421
422 if (!dsmark_valid_index(p, cl))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 return -EINVAL;
Thomas Graf02f23f02005-06-18 22:53:12 -0700424
Eric Dumazetcc7ec452011-01-19 19:26:56 +0000425 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl - 1);
Patrick McHardycdc7f8e2006-03-20 19:01:06 -0800426 tcm->tcm_info = p->q->handle;
Thomas Graf02f23f02005-06-18 22:53:12 -0700427
Patrick McHardy1e904742008-01-22 22:11:17 -0800428 opts = nla_nest_start(skb, TCA_OPTIONS);
429 if (opts == NULL)
430 goto nla_put_failure;
David S. Miller1b34ec42012-03-29 05:11:39 -0400431 if (nla_put_u8(skb, TCA_DSMARK_MASK, p->mask[cl - 1]) ||
432 nla_put_u8(skb, TCA_DSMARK_VALUE, p->value[cl - 1]))
433 goto nla_put_failure;
Thomas Graf02f23f02005-06-18 22:53:12 -0700434
Patrick McHardy1e904742008-01-22 22:11:17 -0800435 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436
Patrick McHardy1e904742008-01-22 22:11:17 -0800437nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700438 nla_nest_cancel(skb, opts);
439 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
442static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
443{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800444 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800445 struct nlattr *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446
Patrick McHardy1e904742008-01-22 22:11:17 -0800447 opts = nla_nest_start(skb, TCA_OPTIONS);
448 if (opts == NULL)
449 goto nla_put_failure;
David S. Miller1b34ec42012-03-29 05:11:39 -0400450 if (nla_put_u16(skb, TCA_DSMARK_INDICES, p->indices))
451 goto nla_put_failure;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700452
David S. Miller1b34ec42012-03-29 05:11:39 -0400453 if (p->default_index != NO_DEFAULT_INDEX &&
454 nla_put_u16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index))
455 goto nla_put_failure;
Thomas Graf02f23f02005-06-18 22:53:12 -0700456
David S. Miller1b34ec42012-03-29 05:11:39 -0400457 if (p->set_tc_index &&
458 nla_put_flag(skb, TCA_DSMARK_SET_TC_INDEX))
459 goto nla_put_failure;
Thomas Graf02f23f02005-06-18 22:53:12 -0700460
Patrick McHardy1e904742008-01-22 22:11:17 -0800461 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
Patrick McHardy1e904742008-01-22 22:11:17 -0800463nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700464 nla_nest_cancel(skb, opts);
465 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466}
467
Eric Dumazet20fea082007-11-14 01:44:41 -0800468static const struct Qdisc_class_ops dsmark_class_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 .graft = dsmark_graft,
470 .leaf = dsmark_leaf,
471 .get = dsmark_get,
472 .put = dsmark_put,
473 .change = dsmark_change,
474 .delete = dsmark_delete,
475 .walk = dsmark_walk,
476 .tcf_chain = dsmark_find_tcf,
477 .bind_tcf = dsmark_bind_filter,
478 .unbind_tcf = dsmark_put,
479 .dump = dsmark_dump_class,
480};
481
Eric Dumazet20fea082007-11-14 01:44:41 -0800482static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 .next = NULL,
484 .cl_ops = &dsmark_class_ops,
485 .id = "dsmark",
486 .priv_size = sizeof(struct dsmark_qdisc_data),
487 .enqueue = dsmark_enqueue,
488 .dequeue = dsmark_dequeue,
Jarek Poplawski8e3af972008-10-31 00:45:55 -0700489 .peek = dsmark_peek,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 .drop = dsmark_drop,
491 .init = dsmark_init,
492 .reset = dsmark_reset,
493 .destroy = dsmark_destroy,
494 .change = NULL,
495 .dump = dsmark_dump,
496 .owner = THIS_MODULE,
497};
498
499static int __init dsmark_module_init(void)
500{
501 return register_qdisc(&dsmark_qdisc_ops);
502}
Thomas Grafaf0d1142005-06-18 22:53:29 -0700503
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900504static void __exit dsmark_module_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505{
506 unregister_qdisc(&dsmark_qdisc_ops);
507}
Thomas Grafaf0d1142005-06-18 22:53:29 -0700508
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509module_init(dsmark_module_init)
510module_exit(dsmark_module_exit)
Thomas Grafaf0d1142005-06-18 22:53:29 -0700511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512MODULE_LICENSE("GPL");