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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>
8#include <linux/types.h>
9#include <linux/string.h>
10#include <linux/errno.h>
11#include <linux/skbuff.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/rtnetlink.h>
David S. Miller5b0ac722008-01-21 02:21:45 -080013#include <linux/bitops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <net/pkt_sched.h>
15#include <net/dsfield.h>
16#include <net/inet_ecn.h>
17#include <asm/byteorder.h>
18
Linus Torvalds1da177e2005-04-16 15:20:36 -070019/*
20 * classid class marking
21 * ------- ----- -------
22 * n/a 0 n/a
23 * x:0 1 use entry [0]
24 * ... ... ...
25 * x:y y>0 y+1 use entry [y]
26 * ... ... ...
27 * x:indices-1 indices use entry [indices-1]
28 * ... ... ...
29 * x:y y+1 use entry [y & (indices-1)]
30 * ... ... ...
31 * 0xffff 0x10000 use entry [indices-1]
32 */
33
34
35#define NO_DEFAULT_INDEX (1 << 16)
36
37struct dsmark_qdisc_data {
38 struct Qdisc *q;
39 struct tcf_proto *filter_list;
Thomas Grafaf0d1142005-06-18 22:53:29 -070040 u8 *mask; /* "owns" the array */
41 u8 *value;
42 u16 indices;
43 u32 default_index; /* index range is 0...0xffff */
Linus Torvalds1da177e2005-04-16 15:20:36 -070044 int set_tc_index;
45};
46
Thomas Graf758cc432005-06-18 22:52:54 -070047static inline int dsmark_valid_index(struct dsmark_qdisc_data *p, u16 index)
48{
49 return (index <= p->indices && index > 0);
50}
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/* ------------------------- Class/flow operations ------------------------- */
53
Thomas Grafaf0d1142005-06-18 22:53:29 -070054static int dsmark_graft(struct Qdisc *sch, unsigned long arg,
55 struct Qdisc *new, struct Qdisc **old)
Linus Torvalds1da177e2005-04-16 15:20:36 -070056{
Stephen Hemminger81da99e2008-01-21 00:50:09 -080057 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Stephen Hemminger81da99e2008-01-21 00:50:09 -080059 pr_debug("dsmark_graft(sch %p,[qdisc %p],new %p,old %p)\n",
Thomas Grafaf0d1142005-06-18 22:53:29 -070060 sch, p, new, old);
Thomas Graf486b53e2005-05-31 15:16:52 -070061
62 if (new == NULL) {
David S. Miller5ce2d482008-07-08 17:06:30 -070063 new = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
David S. Millerbb949fb2008-07-08 16:55:56 -070064 &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);
Thomas Grafaf0d1142005-06-18 22:53:29 -070071 *old = xchg(&p->q, new);
Patrick McHardy5e50da02006-11-29 17:36:20 -080072 qdisc_tree_decrease_qlen(*old, (*old)->q.qlen);
Thomas Grafaf0d1142005-06-18 22:53:29 -070073 qdisc_reset(*old);
Thomas Grafaf0d1142005-06-18 22:53:29 -070074 sch_tree_unlock(sch);
75
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +090076 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static struct Qdisc *dsmark_leaf(struct Qdisc *sch, unsigned long arg)
80{
Stephen Hemminger81da99e2008-01-21 00:50:09 -080081 struct dsmark_qdisc_data *p = qdisc_priv(sch);
82 return p->q;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
Thomas Grafaf0d1142005-06-18 22:53:29 -070085static unsigned long dsmark_get(struct Qdisc *sch, u32 classid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Stephen Hemminger81da99e2008-01-21 00:50:09 -080087 pr_debug("dsmark_get(sch %p,[qdisc %p],classid %x)\n",
88 sch, qdisc_priv(sch), classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
Thomas Grafaf0d1142005-06-18 22:53:29 -070090 return TC_H_MIN(classid) + 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093static unsigned long dsmark_bind_filter(struct Qdisc *sch,
Thomas Grafaf0d1142005-06-18 22:53:29 -070094 unsigned long parent, u32 classid)
Linus Torvalds1da177e2005-04-16 15:20:36 -070095{
Thomas Grafaf0d1142005-06-18 22:53:29 -070096 return dsmark_get(sch, classid);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097}
98
Linus Torvalds1da177e2005-04-16 15:20:36 -070099static void dsmark_put(struct Qdisc *sch, unsigned long cl)
100{
101}
102
Patrick McHardy27a34212008-01-23 20:35:39 -0800103static const struct nla_policy dsmark_policy[TCA_DSMARK_MAX + 1] = {
104 [TCA_DSMARK_INDICES] = { .type = NLA_U16 },
105 [TCA_DSMARK_DEFAULT_INDEX] = { .type = NLA_U16 },
106 [TCA_DSMARK_SET_TC_INDEX] = { .type = NLA_FLAG },
107 [TCA_DSMARK_MASK] = { .type = NLA_U8 },
108 [TCA_DSMARK_VALUE] = { .type = NLA_U8 },
109};
110
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111static int dsmark_change(struct Qdisc *sch, u32 classid, u32 parent,
Patrick McHardy1e904742008-01-22 22:11:17 -0800112 struct nlattr **tca, unsigned long *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800114 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800115 struct nlattr *opt = tca[TCA_OPTIONS];
116 struct nlattr *tb[TCA_DSMARK_MAX + 1];
Thomas Graf758cc432005-06-18 22:52:54 -0700117 int err = -EINVAL;
118 u8 mask = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800120 pr_debug("dsmark_change(sch %p,[qdisc %p],classid %x,parent %x),"
Thomas Graf758cc432005-06-18 22:52:54 -0700121 "arg 0x%lx\n", sch, p, classid, parent, *arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122
Thomas Graf758cc432005-06-18 22:52:54 -0700123 if (!dsmark_valid_index(p, *arg)) {
124 err = -ENOENT;
Patrick McHardy1e904742008-01-22 22:11:17 -0800125 goto errout;
Thomas Graf758cc432005-06-18 22:52:54 -0700126 }
127
Patrick McHardycee63722008-01-23 20:33:32 -0800128 if (!opt)
Patrick McHardy1e904742008-01-22 22:11:17 -0800129 goto errout;
Thomas Graf758cc432005-06-18 22:52:54 -0700130
Patrick McHardy27a34212008-01-23 20:35:39 -0800131 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800132 if (err < 0)
Patrick McHardy27a34212008-01-23 20:35:39 -0800133 goto errout;
Patrick McHardycee63722008-01-23 20:33:32 -0800134
Patrick McHardy27a34212008-01-23 20:35:39 -0800135 if (tb[TCA_DSMARK_MASK])
Patrick McHardy1e904742008-01-22 22:11:17 -0800136 mask = nla_get_u8(tb[TCA_DSMARK_MASK]);
Patrick McHardy27a34212008-01-23 20:35:39 -0800137
138 if (tb[TCA_DSMARK_VALUE])
Patrick McHardy1e904742008-01-22 22:11:17 -0800139 p->value[*arg-1] = nla_get_u8(tb[TCA_DSMARK_VALUE]);
Thomas Graf758cc432005-06-18 22:52:54 -0700140
Patrick McHardy1e904742008-01-22 22:11:17 -0800141 if (tb[TCA_DSMARK_MASK])
Thomas Graf758cc432005-06-18 22:52:54 -0700142 p->mask[*arg-1] = mask;
143
144 err = 0;
145
Patrick McHardy1e904742008-01-22 22:11:17 -0800146errout:
Thomas Graf758cc432005-06-18 22:52:54 -0700147 return err;
148}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Thomas Grafaf0d1142005-06-18 22:53:29 -0700150static int dsmark_delete(struct Qdisc *sch, unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800152 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Thomas Grafaf0d1142005-06-18 22:53:29 -0700154 if (!dsmark_valid_index(p, arg))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return -EINVAL;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900156
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 p->mask[arg-1] = 0xff;
158 p->value[arg-1] = 0;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700159
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 return 0;
161}
162
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800163static void dsmark_walk(struct Qdisc *sch, struct qdisc_walker *walker)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800165 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 int i;
167
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800168 pr_debug("dsmark_walk(sch %p,[qdisc %p],walker %p)\n", sch, p, walker);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (walker->stop)
171 return;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700172
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 for (i = 0; i < p->indices; i++) {
174 if (p->mask[i] == 0xff && !p->value[i])
Thomas Graf0451eb02005-05-31 15:15:58 -0700175 goto ignore;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (walker->count >= walker->skip) {
177 if (walker->fn(sch, i+1, walker) < 0) {
178 walker->stop = 1;
179 break;
180 }
181 }
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900182ignore:
Thomas Graf0451eb02005-05-31 15:15:58 -0700183 walker->count++;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900184 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800187static inline struct tcf_proto **dsmark_find_tcf(struct Qdisc *sch,
188 unsigned long cl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800190 struct dsmark_qdisc_data *p = qdisc_priv(sch);
191 return &p->filter_list;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192}
193
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194/* --------------------------- Qdisc operations ---------------------------- */
195
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800196static int dsmark_enqueue(struct sk_buff *skb, struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800198 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700199 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800201 pr_debug("dsmark_enqueue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700202
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 if (p->set_tc_index) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 switch (skb->protocol) {
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800205 case __constant_htons(ETH_P_IP):
206 if (skb_cow_head(skb, sizeof(struct iphdr)))
207 goto drop;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800208
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800209 skb->tc_index = ipv4_get_dsfield(ip_hdr(skb))
210 & ~INET_ECN_MASK;
211 break;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800212
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800213 case __constant_htons(ETH_P_IPV6):
214 if (skb_cow_head(skb, sizeof(struct ipv6hdr)))
215 goto drop;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800216
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800217 skb->tc_index = ipv6_get_dsfield(ipv6_hdr(skb))
218 & ~INET_ECN_MASK;
219 break;
220 default:
221 skb->tc_index = 0;
222 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700223 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700225
226 if (TC_H_MAJ(skb->priority) == sch->handle)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 skb->tc_index = TC_H_MIN(skb->priority);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700228 else {
229 struct tcf_result res;
230 int result = tc_classify(skb, p->filter_list, &res);
231
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800232 pr_debug("result %d class 0x%04x\n", result, res.classid);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700233
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 switch (result) {
Patrick McHardyf6853e22007-07-15 00:02:10 -0700235#ifdef CONFIG_NET_CLS_ACT
236 case TC_ACT_QUEUED:
237 case TC_ACT_STOLEN:
238 kfree_skb(skb);
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700239 return NET_XMIT_SUCCESS | __NET_XMIT_STOLEN;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800240
Patrick McHardyf6853e22007-07-15 00:02:10 -0700241 case TC_ACT_SHOT:
Stephen Hemminger4c307192008-01-21 02:23:49 -0800242 goto drop;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243#endif
Patrick McHardyc3bc7cf2007-07-15 00:03:05 -0700244 case TC_ACT_OK:
Patrick McHardyf6853e22007-07-15 00:02:10 -0700245 skb->tc_index = TC_H_MIN(res.classid);
246 break;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800247
Patrick McHardyf6853e22007-07-15 00:02:10 -0700248 default:
249 if (p->default_index != NO_DEFAULT_INDEX)
250 skb->tc_index = p->default_index;
251 break;
Stephen Hemminger3ff50b72007-04-20 17:09:22 -0700252 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254
Jussi Kivilinna5f861732008-07-20 00:08:04 -0700255 err = qdisc_enqueue(skb, p->q);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700256 if (err != NET_XMIT_SUCCESS) {
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700257 if (net_xmit_drop_count(err))
258 sch->qstats.drops++;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700259 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 }
Thomas Grafaf0d1142005-06-18 22:53:29 -0700261
Jussi Kivilinna0abf77e2008-07-20 00:08:27 -0700262 sch->bstats.bytes += qdisc_pkt_len(skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 sch->bstats.packets++;
264 sch->q.qlen++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Thomas Grafaf0d1142005-06-18 22:53:29 -0700266 return NET_XMIT_SUCCESS;
Stephen Hemminger4c307192008-01-21 02:23:49 -0800267
268drop:
269 kfree_skb(skb);
270 sch->qstats.drops++;
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
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800280 pr_debug("dsmark_dequeue(sch %p,[qdisc %p])\n", 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 sch->q.qlen--;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700287
288 index = skb->tc_index & (p->indices - 1);
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800289 pr_debug("index %d->%d\n", skb->tc_index, index);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700290
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 switch (skb->protocol) {
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800292 case __constant_htons(ETH_P_IP):
293 ipv4_change_dsfield(ip_hdr(skb), p->mask[index],
294 p->value[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 break;
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800296 case __constant_htons(ETH_P_IPV6):
297 ipv6_change_dsfield(ipv6_hdr(skb), p->mask[index],
298 p->value[index]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 break;
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800300 default:
301 /*
302 * Only complain if a change was actually attempted.
303 * This way, we can send non-IP traffic through dsmark
304 * and don't need yet another qdisc as a bypass.
305 */
306 if (p->mask[index] != 0xff || p->value[index])
307 printk(KERN_WARNING
308 "dsmark_dequeue: unsupported protocol %d\n",
309 ntohs(skb->protocol));
310 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
Stephen Hemminger9d127fb2008-01-21 02:24:21 -0800316static int dsmark_requeue(struct sk_buff *skb, struct Qdisc *sch)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800318 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700319 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800321 pr_debug("dsmark_requeue(skb %p,sch %p,[qdisc %p])\n", skb, sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700322
323 err = p->q->ops->requeue(skb, p->q);
324 if (err != NET_XMIT_SUCCESS) {
Jarek Poplawski378a2f02008-08-04 22:31:03 -0700325 if (net_xmit_drop_count(err))
326 sch->qstats.drops++;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700327 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Thomas Grafaf0d1142005-06-18 22:53:29 -0700330 sch->q.qlen++;
331 sch->qstats.requeues++;
332
333 return NET_XMIT_SUCCESS;
334}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
336static unsigned int dsmark_drop(struct Qdisc *sch)
337{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800338 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 unsigned int len;
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900340
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800341 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700342
343 if (p->q->ops->drop == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344 return 0;
Thomas Grafaf0d1142005-06-18 22:53:29 -0700345
346 len = p->q->ops->drop(p->q);
347 if (len)
348 sch->q.qlen--;
349
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 return len;
351}
352
Patrick McHardy1e904742008-01-22 22:11:17 -0800353static int dsmark_init(struct Qdisc *sch, struct nlattr *opt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800355 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800356 struct nlattr *tb[TCA_DSMARK_MAX + 1];
Thomas Graf758cc432005-06-18 22:52:54 -0700357 int err = -EINVAL;
358 u32 default_index = NO_DEFAULT_INDEX;
359 u16 indices;
360 u8 *mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800362 pr_debug("dsmark_init(sch %p,[qdisc %p],opt %p)\n", sch, p, opt);
Thomas Graf758cc432005-06-18 22:52:54 -0700363
Patrick McHardycee63722008-01-23 20:33:32 -0800364 if (!opt)
Thomas Graf758cc432005-06-18 22:52:54 -0700365 goto errout;
366
Patrick McHardy27a34212008-01-23 20:35:39 -0800367 err = nla_parse_nested(tb, TCA_DSMARK_MAX, opt, dsmark_policy);
Patrick McHardycee63722008-01-23 20:33:32 -0800368 if (err < 0)
369 goto errout;
370
371 err = -EINVAL;
Patrick McHardy1e904742008-01-22 22:11:17 -0800372 indices = nla_get_u16(tb[TCA_DSMARK_INDICES]);
David S. Miller5b0ac722008-01-21 02:21:45 -0800373
374 if (hweight32(indices) != 1)
Thomas Graf758cc432005-06-18 22:52:54 -0700375 goto errout;
376
Patrick McHardy27a34212008-01-23 20:35:39 -0800377 if (tb[TCA_DSMARK_DEFAULT_INDEX])
Patrick McHardy1e904742008-01-22 22:11:17 -0800378 default_index = nla_get_u16(tb[TCA_DSMARK_DEFAULT_INDEX]);
Thomas Graf758cc432005-06-18 22:52:54 -0700379
380 mask = kmalloc(indices * 2, GFP_KERNEL);
381 if (mask == NULL) {
382 err = -ENOMEM;
383 goto errout;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 }
Thomas Graf758cc432005-06-18 22:52:54 -0700385
386 p->mask = mask;
387 memset(p->mask, 0xff, indices);
388
389 p->value = p->mask + indices;
390 memset(p->value, 0, indices);
391
392 p->indices = indices;
393 p->default_index = default_index;
Patrick McHardy1e904742008-01-22 22:11:17 -0800394 p->set_tc_index = nla_get_flag(tb[TCA_DSMARK_SET_TC_INDEX]);
Thomas Graf758cc432005-06-18 22:52:54 -0700395
David S. Miller5ce2d482008-07-08 17:06:30 -0700396 p->q = qdisc_create_dflt(qdisc_dev(sch), sch->dev_queue,
David S. Millerbb949fb2008-07-08 16:55:56 -0700397 &pfifo_qdisc_ops, sch->handle);
Thomas Graf758cc432005-06-18 22:52:54 -0700398 if (p->q == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399 p->q = &noop_qdisc;
Thomas Graf758cc432005-06-18 22:52:54 -0700400
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800401 pr_debug("dsmark_init: qdisc %p\n", p->q);
Thomas Graf758cc432005-06-18 22:52:54 -0700402
403 err = 0;
404errout:
Thomas Graf758cc432005-06-18 22:52:54 -0700405 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406}
407
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408static void dsmark_reset(struct Qdisc *sch)
409{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800410 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800412 pr_debug("dsmark_reset(sch %p,[qdisc %p])\n", sch, p);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 qdisc_reset(p->q);
414 sch->q.qlen = 0;
415}
416
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417static void dsmark_destroy(struct Qdisc *sch)
418{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800419 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800421 pr_debug("dsmark_destroy(sch %p,[qdisc %p])\n", sch, p);
Thomas Grafaf0d1142005-06-18 22:53:29 -0700422
Patrick McHardyff31ab52008-07-01 19:52:38 -0700423 tcf_destroy_chain(&p->filter_list);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 qdisc_destroy(p->q);
425 kfree(p->mask);
426}
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428static int dsmark_dump_class(struct Qdisc *sch, unsigned long cl,
Thomas Graf02f23f02005-06-18 22:53:12 -0700429 struct sk_buff *skb, struct tcmsg *tcm)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800431 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800432 struct nlattr *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800434 pr_debug("dsmark_dump_class(sch %p,[qdisc %p],class %ld\n", sch, p, cl);
Thomas Graf02f23f02005-06-18 22:53:12 -0700435
436 if (!dsmark_valid_index(p, cl))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 return -EINVAL;
Thomas Graf02f23f02005-06-18 22:53:12 -0700438
439 tcm->tcm_handle = TC_H_MAKE(TC_H_MAJ(sch->handle), cl-1);
Patrick McHardycdc7f8e2006-03-20 19:01:06 -0800440 tcm->tcm_info = p->q->handle;
Thomas Graf02f23f02005-06-18 22:53:12 -0700441
Patrick McHardy1e904742008-01-22 22:11:17 -0800442 opts = nla_nest_start(skb, TCA_OPTIONS);
443 if (opts == NULL)
444 goto nla_put_failure;
445 NLA_PUT_U8(skb, TCA_DSMARK_MASK, p->mask[cl-1]);
446 NLA_PUT_U8(skb, TCA_DSMARK_VALUE, p->value[cl-1]);
Thomas Graf02f23f02005-06-18 22:53:12 -0700447
Patrick McHardy1e904742008-01-22 22:11:17 -0800448 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
Patrick McHardy1e904742008-01-22 22:11:17 -0800450nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700451 nla_nest_cancel(skb, opts);
452 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453}
454
455static int dsmark_dump(struct Qdisc *sch, struct sk_buff *skb)
456{
Stephen Hemminger81da99e2008-01-21 00:50:09 -0800457 struct dsmark_qdisc_data *p = qdisc_priv(sch);
Patrick McHardy1e904742008-01-22 22:11:17 -0800458 struct nlattr *opts = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459
Patrick McHardy1e904742008-01-22 22:11:17 -0800460 opts = nla_nest_start(skb, TCA_OPTIONS);
461 if (opts == NULL)
462 goto nla_put_failure;
463 NLA_PUT_U16(skb, TCA_DSMARK_INDICES, p->indices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Thomas Graf02f23f02005-06-18 22:53:12 -0700465 if (p->default_index != NO_DEFAULT_INDEX)
Patrick McHardy1e904742008-01-22 22:11:17 -0800466 NLA_PUT_U16(skb, TCA_DSMARK_DEFAULT_INDEX, p->default_index);
Thomas Graf02f23f02005-06-18 22:53:12 -0700467
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (p->set_tc_index)
Patrick McHardy1e904742008-01-22 22:11:17 -0800469 NLA_PUT_FLAG(skb, TCA_DSMARK_SET_TC_INDEX);
Thomas Graf02f23f02005-06-18 22:53:12 -0700470
Patrick McHardy1e904742008-01-22 22:11:17 -0800471 return nla_nest_end(skb, opts);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
Patrick McHardy1e904742008-01-22 22:11:17 -0800473nla_put_failure:
Thomas Grafbc3ed282008-06-03 16:36:54 -0700474 nla_nest_cancel(skb, opts);
475 return -EMSGSIZE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476}
477
Eric Dumazet20fea082007-11-14 01:44:41 -0800478static const struct Qdisc_class_ops dsmark_class_ops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 .graft = dsmark_graft,
480 .leaf = dsmark_leaf,
481 .get = dsmark_get,
482 .put = dsmark_put,
483 .change = dsmark_change,
484 .delete = dsmark_delete,
485 .walk = dsmark_walk,
486 .tcf_chain = dsmark_find_tcf,
487 .bind_tcf = dsmark_bind_filter,
488 .unbind_tcf = dsmark_put,
489 .dump = dsmark_dump_class,
490};
491
Eric Dumazet20fea082007-11-14 01:44:41 -0800492static struct Qdisc_ops dsmark_qdisc_ops __read_mostly = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 .next = NULL,
494 .cl_ops = &dsmark_class_ops,
495 .id = "dsmark",
496 .priv_size = sizeof(struct dsmark_qdisc_data),
497 .enqueue = dsmark_enqueue,
498 .dequeue = dsmark_dequeue,
499 .requeue = dsmark_requeue,
500 .drop = dsmark_drop,
501 .init = dsmark_init,
502 .reset = dsmark_reset,
503 .destroy = dsmark_destroy,
504 .change = NULL,
505 .dump = dsmark_dump,
506 .owner = THIS_MODULE,
507};
508
509static int __init dsmark_module_init(void)
510{
511 return register_qdisc(&dsmark_qdisc_ops);
512}
Thomas Grafaf0d1142005-06-18 22:53:29 -0700513
YOSHIFUJI Hideaki10297b92007-02-09 23:25:16 +0900514static void __exit dsmark_module_exit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515{
516 unregister_qdisc(&dsmark_qdisc_ops);
517}
Thomas Grafaf0d1142005-06-18 22:53:29 -0700518
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519module_init(dsmark_module_init)
520module_exit(dsmark_module_exit)
Thomas Grafaf0d1142005-06-18 22:53:29 -0700521
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522MODULE_LICENSE("GPL");