Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * net/sched/sch_netem.c Network emulator |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; either version |
Stephen Hemminger | 798b6b1 | 2006-10-22 20:16:57 -0700 | [diff] [blame] | 7 | * 2 of the License. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
| 9 | * Many of the algorithms and ideas for this came from |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 10 | * NIST Net which is not copyrighted. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * Authors: Stephen Hemminger <shemminger@osdl.org> |
| 13 | * Catalin(ux aka Dino) BOIE <catab at umbrella dot ro> |
| 14 | */ |
| 15 | |
Alexey Dobriyan | b7f080c | 2011-06-16 11:01:34 +0000 | [diff] [blame] | 16 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/module.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/types.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/errno.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/skbuff.h> |
David S. Miller | 78776d3 | 2011-02-24 22:48:13 -0800 | [diff] [blame] | 23 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <linux/rtnetlink.h> |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 25 | #include <linux/reciprocal_div.h> |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 26 | #include <linux/rbtree.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | |
Arnaldo Carvalho de Melo | dc5fc57 | 2007-03-25 23:06:12 -0700 | [diff] [blame] | 28 | #include <net/netlink.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <net/pkt_sched.h> |
Eric Dumazet | e4ae004 | 2012-04-30 23:11:05 +0000 | [diff] [blame] | 30 | #include <net/inet_ecn.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | |
stephen hemminger | 250a65f | 2011-02-23 13:04:22 +0000 | [diff] [blame] | 32 | #define VERSION "1.3" |
Stephen Hemminger | eb229c4 | 2005-11-03 13:49:01 -0800 | [diff] [blame] | 33 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | /* Network Emulation Queuing algorithm. |
| 35 | ==================================== |
| 36 | |
| 37 | Sources: [1] Mark Carson, Darrin Santay, "NIST Net - A Linux-based |
| 38 | Network Emulation Tool |
| 39 | [2] Luigi Rizzo, DummyNet for FreeBSD |
| 40 | |
| 41 | ---------------------------------------------------------------- |
| 42 | |
| 43 | This started out as a simple way to delay outgoing packets to |
| 44 | test TCP but has grown to include most of the functionality |
| 45 | of a full blown network emulator like NISTnet. It can delay |
| 46 | packets and add random jitter (and correlation). The random |
| 47 | distribution can be loaded from a table as well to provide |
| 48 | normal, Pareto, or experimental curves. Packet loss, |
| 49 | duplication, and reordering can also be emulated. |
| 50 | |
| 51 | This qdisc does not do classification that can be handled in |
| 52 | layering other disciplines. It does not need to do bandwidth |
| 53 | control either since that can be handled by using token |
| 54 | bucket or other rate control. |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 55 | |
| 56 | Correlated Loss Generator models |
| 57 | |
| 58 | Added generation of correlated loss according to the |
| 59 | "Gilbert-Elliot" model, a 4-state markov model. |
| 60 | |
| 61 | References: |
| 62 | [1] NetemCLG Home http://netgroup.uniroma2.it/NetemCLG |
| 63 | [2] S. Salsano, F. Ludovici, A. Ordine, "Definition of a general |
| 64 | and intuitive loss model for packet networks and its implementation |
| 65 | in the Netem module in the Linux kernel", available in [1] |
| 66 | |
| 67 | Authors: Stefano Salsano <stefano.salsano at uniroma2.it |
| 68 | Fabio Ludovici <fabio.ludovici at yahoo.it> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | */ |
| 70 | |
| 71 | struct netem_sched_data { |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 72 | /* internal t(ime)fifo qdisc uses t_root and sch->limit */ |
| 73 | struct rb_root t_root; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 74 | |
| 75 | /* optional qdisc for classful handling (NULL at netem init) */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | struct Qdisc *qdisc; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 77 | |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 78 | struct qdisc_watchdog watchdog; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 80 | psched_tdiff_t latency; |
| 81 | psched_tdiff_t jitter; |
| 82 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | u32 loss; |
Eric Dumazet | e4ae004 | 2012-04-30 23:11:05 +0000 | [diff] [blame] | 84 | u32 ecn; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | u32 limit; |
| 86 | u32 counter; |
| 87 | u32 gap; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | u32 duplicate; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 89 | u32 reorder; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 90 | u32 corrupt; |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 91 | u32 rate; |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 92 | s32 packet_overhead; |
| 93 | u32 cell_size; |
| 94 | u32 cell_size_reciprocal; |
| 95 | s32 cell_overhead; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | |
| 97 | struct crndstate { |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 98 | u32 last; |
| 99 | u32 rho; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 100 | } delay_cor, loss_cor, dup_cor, reorder_cor, corrupt_cor; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | struct disttable { |
| 103 | u32 size; |
| 104 | s16 table[0]; |
| 105 | } *delay_dist; |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 106 | |
| 107 | enum { |
| 108 | CLG_RANDOM, |
| 109 | CLG_4_STATES, |
| 110 | CLG_GILB_ELL, |
| 111 | } loss_model; |
| 112 | |
| 113 | /* Correlated Loss Generation models */ |
| 114 | struct clgstate { |
| 115 | /* state of the Markov chain */ |
| 116 | u8 state; |
| 117 | |
| 118 | /* 4-states and Gilbert-Elliot models */ |
| 119 | u32 a1; /* p13 for 4-states or p for GE */ |
| 120 | u32 a2; /* p31 for 4-states or r for GE */ |
| 121 | u32 a3; /* p32 for 4-states or h for GE */ |
| 122 | u32 a4; /* p14 for 4-states or 1-k for GE */ |
| 123 | u32 a5; /* p23 used only in 4-states */ |
| 124 | } clg; |
| 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | }; |
| 127 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 128 | /* Time stamp put into socket buffer control block |
| 129 | * Only valid when skbs are in our internal t(ime)fifo queue. |
| 130 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | struct netem_skb_cb { |
| 132 | psched_time_t time_to_send; |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 133 | ktime_t tstamp_save; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 136 | /* Because space in skb->cb[] is tight, netem overloads skb->next/prev/tstamp |
| 137 | * to hold a rb_node structure. |
| 138 | * |
| 139 | * If struct sk_buff layout is changed, the following checks will complain. |
| 140 | */ |
| 141 | static struct rb_node *netem_rb_node(struct sk_buff *skb) |
| 142 | { |
| 143 | BUILD_BUG_ON(offsetof(struct sk_buff, next) != 0); |
| 144 | BUILD_BUG_ON(offsetof(struct sk_buff, prev) != |
| 145 | offsetof(struct sk_buff, next) + sizeof(skb->next)); |
| 146 | BUILD_BUG_ON(offsetof(struct sk_buff, tstamp) != |
| 147 | offsetof(struct sk_buff, prev) + sizeof(skb->prev)); |
| 148 | BUILD_BUG_ON(sizeof(struct rb_node) > sizeof(skb->next) + |
| 149 | sizeof(skb->prev) + |
| 150 | sizeof(skb->tstamp)); |
| 151 | return (struct rb_node *)&skb->next; |
| 152 | } |
| 153 | |
| 154 | static struct sk_buff *netem_rb_to_skb(struct rb_node *rb) |
| 155 | { |
| 156 | return (struct sk_buff *)rb; |
| 157 | } |
| 158 | |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 159 | static inline struct netem_skb_cb *netem_skb_cb(struct sk_buff *skb) |
| 160 | { |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 161 | /* we assume we can use skb next/prev/tstamp as storage for rb_node */ |
David S. Miller | 16bda13 | 2012-02-06 15:14:37 -0500 | [diff] [blame] | 162 | qdisc_cb_private_validate(skb, sizeof(struct netem_skb_cb)); |
Jussi Kivilinna | 175f9c1 | 2008-07-20 00:08:47 -0700 | [diff] [blame] | 163 | return (struct netem_skb_cb *)qdisc_skb_cb(skb)->data; |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 164 | } |
| 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* init_crandom - initialize correlated random number generator |
| 167 | * Use entropy source for initial seed. |
| 168 | */ |
| 169 | static void init_crandom(struct crndstate *state, unsigned long rho) |
| 170 | { |
| 171 | state->rho = rho; |
| 172 | state->last = net_random(); |
| 173 | } |
| 174 | |
| 175 | /* get_crandom - correlated random number generator |
| 176 | * Next number depends on last value. |
| 177 | * rho is scaled to avoid floating point. |
| 178 | */ |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 179 | static u32 get_crandom(struct crndstate *state) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | { |
| 181 | u64 value, rho; |
| 182 | unsigned long answer; |
| 183 | |
Stephen Hemminger | bb2f8cc | 2007-03-23 00:12:09 -0700 | [diff] [blame] | 184 | if (state->rho == 0) /* no correlation */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | return net_random(); |
| 186 | |
| 187 | value = net_random(); |
| 188 | rho = (u64)state->rho + 1; |
| 189 | answer = (value * ((1ull<<32) - rho) + state->last * rho) >> 32; |
| 190 | state->last = answer; |
| 191 | return answer; |
| 192 | } |
| 193 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 194 | /* loss_4state - 4-state model loss generator |
| 195 | * Generates losses according to the 4-state Markov chain adopted in |
| 196 | * the GI (General and Intuitive) loss model. |
| 197 | */ |
| 198 | static bool loss_4state(struct netem_sched_data *q) |
| 199 | { |
| 200 | struct clgstate *clg = &q->clg; |
| 201 | u32 rnd = net_random(); |
| 202 | |
| 203 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 204 | * Makes a comparison between rnd and the transition |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 205 | * probabilities outgoing from the current state, then decides the |
| 206 | * next state and if the next packet has to be transmitted or lost. |
| 207 | * The four states correspond to: |
| 208 | * 1 => successfully transmitted packets within a gap period |
| 209 | * 4 => isolated losses within a gap period |
| 210 | * 3 => lost packets within a burst period |
| 211 | * 2 => successfully transmitted packets within a burst period |
| 212 | */ |
| 213 | switch (clg->state) { |
| 214 | case 1: |
| 215 | if (rnd < clg->a4) { |
| 216 | clg->state = 4; |
| 217 | return true; |
| 218 | } else if (clg->a4 < rnd && rnd < clg->a1) { |
| 219 | clg->state = 3; |
| 220 | return true; |
| 221 | } else if (clg->a1 < rnd) |
| 222 | clg->state = 1; |
| 223 | |
| 224 | break; |
| 225 | case 2: |
| 226 | if (rnd < clg->a5) { |
| 227 | clg->state = 3; |
| 228 | return true; |
| 229 | } else |
| 230 | clg->state = 2; |
| 231 | |
| 232 | break; |
| 233 | case 3: |
| 234 | if (rnd < clg->a3) |
| 235 | clg->state = 2; |
| 236 | else if (clg->a3 < rnd && rnd < clg->a2 + clg->a3) { |
| 237 | clg->state = 1; |
| 238 | return true; |
| 239 | } else if (clg->a2 + clg->a3 < rnd) { |
| 240 | clg->state = 3; |
| 241 | return true; |
| 242 | } |
| 243 | break; |
| 244 | case 4: |
| 245 | clg->state = 1; |
| 246 | break; |
| 247 | } |
| 248 | |
| 249 | return false; |
| 250 | } |
| 251 | |
| 252 | /* loss_gilb_ell - Gilbert-Elliot model loss generator |
| 253 | * Generates losses according to the Gilbert-Elliot loss model or |
| 254 | * its special cases (Gilbert or Simple Gilbert) |
| 255 | * |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 256 | * Makes a comparison between random number and the transition |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 257 | * probabilities outgoing from the current state, then decides the |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 258 | * next state. A second random number is extracted and the comparison |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 259 | * with the loss probability of the current state decides if the next |
| 260 | * packet will be transmitted or lost. |
| 261 | */ |
| 262 | static bool loss_gilb_ell(struct netem_sched_data *q) |
| 263 | { |
| 264 | struct clgstate *clg = &q->clg; |
| 265 | |
| 266 | switch (clg->state) { |
| 267 | case 1: |
| 268 | if (net_random() < clg->a1) |
| 269 | clg->state = 2; |
| 270 | if (net_random() < clg->a4) |
| 271 | return true; |
| 272 | case 2: |
| 273 | if (net_random() < clg->a2) |
| 274 | clg->state = 1; |
| 275 | if (clg->a3 > net_random()) |
| 276 | return true; |
| 277 | } |
| 278 | |
| 279 | return false; |
| 280 | } |
| 281 | |
| 282 | static bool loss_event(struct netem_sched_data *q) |
| 283 | { |
| 284 | switch (q->loss_model) { |
| 285 | case CLG_RANDOM: |
| 286 | /* Random packet drop 0 => none, ~0 => all */ |
| 287 | return q->loss && q->loss >= get_crandom(&q->loss_cor); |
| 288 | |
| 289 | case CLG_4_STATES: |
| 290 | /* 4state loss model algorithm (used also for GI model) |
| 291 | * Extracts a value from the markov 4 state loss generator, |
| 292 | * if it is 1 drops a packet and if needed writes the event in |
| 293 | * the kernel logs |
| 294 | */ |
| 295 | return loss_4state(q); |
| 296 | |
| 297 | case CLG_GILB_ELL: |
| 298 | /* Gilbert-Elliot loss model algorithm |
| 299 | * Extracts a value from the Gilbert-Elliot loss generator, |
| 300 | * if it is 1 drops a packet and if needed writes the event in |
| 301 | * the kernel logs |
| 302 | */ |
| 303 | return loss_gilb_ell(q); |
| 304 | } |
| 305 | |
| 306 | return false; /* not reached */ |
| 307 | } |
| 308 | |
| 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | /* tabledist - return a pseudo-randomly distributed value with mean mu and |
| 311 | * std deviation sigma. Uses table lookup to approximate the desired |
| 312 | * distribution, and a uniformly-distributed pseudo-random source. |
| 313 | */ |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 314 | static psched_tdiff_t tabledist(psched_tdiff_t mu, psched_tdiff_t sigma, |
| 315 | struct crndstate *state, |
| 316 | const struct disttable *dist) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | { |
Stephen Hemminger | b407621 | 2007-03-22 12:16:21 -0700 | [diff] [blame] | 318 | psched_tdiff_t x; |
| 319 | long t; |
| 320 | u32 rnd; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
| 322 | if (sigma == 0) |
| 323 | return mu; |
| 324 | |
| 325 | rnd = get_crandom(state); |
| 326 | |
| 327 | /* default uniform distribution */ |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 328 | if (dist == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | return (rnd % (2*sigma)) - sigma + mu; |
| 330 | |
| 331 | t = dist->table[rnd % dist->size]; |
| 332 | x = (sigma % NETEM_DIST_SCALE) * t; |
| 333 | if (x >= 0) |
| 334 | x += NETEM_DIST_SCALE/2; |
| 335 | else |
| 336 | x -= NETEM_DIST_SCALE/2; |
| 337 | |
| 338 | return x / NETEM_DIST_SCALE + (sigma / NETEM_DIST_SCALE) * t + mu; |
| 339 | } |
| 340 | |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 341 | static psched_time_t packet_len_2_sched_time(unsigned int len, struct netem_sched_data *q) |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 342 | { |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 343 | u64 ticks; |
Eric Dumazet | fc33cc7 | 2011-11-30 23:32:14 +0000 | [diff] [blame] | 344 | |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 345 | len += q->packet_overhead; |
| 346 | |
| 347 | if (q->cell_size) { |
| 348 | u32 cells = reciprocal_divide(len, q->cell_size_reciprocal); |
| 349 | |
| 350 | if (len > cells * q->cell_size) /* extra cell needed for remainder */ |
| 351 | cells++; |
| 352 | len = cells * (q->cell_size + q->cell_overhead); |
| 353 | } |
| 354 | |
| 355 | ticks = (u64)len * NSEC_PER_SEC; |
| 356 | |
| 357 | do_div(ticks, q->rate); |
Eric Dumazet | fc33cc7 | 2011-11-30 23:32:14 +0000 | [diff] [blame] | 358 | return PSCHED_NS2TICKS(ticks); |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 359 | } |
| 360 | |
Eric Dumazet | 960fb66 | 2012-07-03 20:55:21 +0000 | [diff] [blame] | 361 | static void tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch) |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 362 | { |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 363 | struct netem_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 364 | psched_time_t tnext = netem_skb_cb(nskb)->time_to_send; |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 365 | struct rb_node **p = &q->t_root.rb_node, *parent = NULL; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 366 | |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 367 | while (*p) { |
| 368 | struct sk_buff *skb; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 369 | |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 370 | parent = *p; |
| 371 | skb = netem_rb_to_skb(parent); |
Eric Dumazet | 960fb66 | 2012-07-03 20:55:21 +0000 | [diff] [blame] | 372 | if (tnext >= netem_skb_cb(skb)->time_to_send) |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 373 | p = &parent->rb_right; |
| 374 | else |
| 375 | p = &parent->rb_left; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 376 | } |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 377 | rb_link_node(netem_rb_node(nskb), parent, p); |
| 378 | rb_insert_color(netem_rb_node(nskb), &q->t_root); |
| 379 | sch->q.qlen++; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 380 | } |
| 381 | |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 382 | /* |
| 383 | * Insert one skb into qdisc. |
| 384 | * Note: parent depends on return value to account for queue length. |
| 385 | * NET_XMIT_DROP: queue length didn't change. |
| 386 | * NET_XMIT_SUCCESS: one skb was queued. |
| 387 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch) |
| 389 | { |
| 390 | struct netem_sched_data *q = qdisc_priv(sch); |
Guillaume Chazarain | 89e1df7 | 2006-07-21 14:45:25 -0700 | [diff] [blame] | 391 | /* We don't fill cb now as skb_unshare() may invalidate it */ |
| 392 | struct netem_skb_cb *cb; |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 393 | struct sk_buff *skb2; |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 394 | int count = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 396 | /* Random duplication */ |
| 397 | if (q->duplicate && q->duplicate >= get_crandom(&q->dup_cor)) |
| 398 | ++count; |
| 399 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 400 | /* Drop packet? */ |
Eric Dumazet | e4ae004 | 2012-04-30 23:11:05 +0000 | [diff] [blame] | 401 | if (loss_event(q)) { |
| 402 | if (q->ecn && INET_ECN_set_ce(skb)) |
| 403 | sch->qstats.drops++; /* mark packet */ |
| 404 | else |
| 405 | --count; |
| 406 | } |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 407 | if (count == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | sch->qstats.drops++; |
| 409 | kfree_skb(skb); |
Jarek Poplawski | c27f339 | 2008-08-04 22:39:11 -0700 | [diff] [blame] | 410 | return NET_XMIT_SUCCESS | __NET_XMIT_BYPASS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
Eric Dumazet | 5a308f4 | 2012-07-14 03:16:27 +0000 | [diff] [blame] | 413 | /* If a delay is expected, orphan the skb. (orphaning usually takes |
| 414 | * place at TX completion time, so _before_ the link transit delay) |
| 415 | * Ideally, this orphaning should be done after the rate limiting |
| 416 | * module, because this breaks TCP Small Queue, and other mechanisms |
| 417 | * based on socket sk_wmem_alloc. |
| 418 | */ |
| 419 | if (q->latency || q->jitter) |
| 420 | skb_orphan(skb); |
David S. Miller | 4e8a520 | 2006-10-22 21:00:33 -0700 | [diff] [blame] | 421 | |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 422 | /* |
| 423 | * If we need to duplicate packet, then re-insert at top of the |
| 424 | * qdisc tree, since parent queuer expects that only one |
| 425 | * skb will be queued. |
| 426 | */ |
| 427 | if (count > 1 && (skb2 = skb_clone(skb, GFP_ATOMIC)) != NULL) { |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 428 | struct Qdisc *rootq = qdisc_root(sch); |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 429 | u32 dupsave = q->duplicate; /* prevent duplicating a dup... */ |
| 430 | q->duplicate = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 432 | qdisc_enqueue_root(skb2, rootq); |
Stephen Hemminger | 0afb51e | 2005-05-26 12:53:49 -0700 | [diff] [blame] | 433 | q->duplicate = dupsave; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | } |
| 435 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 436 | /* |
| 437 | * Randomized packet corruption. |
| 438 | * Make copy if needed since we are modifying |
| 439 | * If packet is going to be hardware checksummed, then |
| 440 | * do it now in software before we mangle it. |
| 441 | */ |
| 442 | if (q->corrupt && q->corrupt >= get_crandom(&q->corrupt_cor)) { |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 443 | if (!(skb = skb_unshare(skb, GFP_ATOMIC)) || |
| 444 | (skb->ip_summed == CHECKSUM_PARTIAL && |
Eric Dumazet | 116a0fc | 2012-04-29 09:08:22 +0000 | [diff] [blame] | 445 | skb_checksum_help(skb))) |
| 446 | return qdisc_drop(skb, sch); |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 447 | |
| 448 | skb->data[net_random() % skb_headlen(skb)] ^= 1<<(net_random() % 8); |
| 449 | } |
| 450 | |
Eric Dumazet | 960fb66 | 2012-07-03 20:55:21 +0000 | [diff] [blame] | 451 | if (unlikely(skb_queue_len(&sch->q) >= sch->limit)) |
| 452 | return qdisc_reshape_fail(skb, sch); |
| 453 | |
| 454 | sch->qstats.backlog += qdisc_pkt_len(skb); |
| 455 | |
Jussi Kivilinna | 5f86173 | 2008-07-20 00:08:04 -0700 | [diff] [blame] | 456 | cb = netem_skb_cb(skb); |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 457 | if (q->gap == 0 || /* not doing reordering */ |
Vijay Subramanian | a42b479 | 2012-01-19 10:20:59 +0000 | [diff] [blame] | 458 | q->counter < q->gap - 1 || /* inside last reordering gap */ |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 459 | q->reorder < get_crandom(&q->reorder_cor)) { |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 460 | psched_time_t now; |
Stephen Hemminger | 07aaa11 | 2005-11-03 13:43:07 -0800 | [diff] [blame] | 461 | psched_tdiff_t delay; |
| 462 | |
| 463 | delay = tabledist(q->latency, q->jitter, |
| 464 | &q->delay_cor, q->delay_dist); |
| 465 | |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 466 | now = psched_get_time(); |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 467 | |
| 468 | if (q->rate) { |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 469 | struct sk_buff *last; |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 470 | |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 471 | if (!skb_queue_empty(&sch->q)) |
| 472 | last = skb_peek_tail(&sch->q); |
| 473 | else |
| 474 | last = netem_rb_to_skb(rb_last(&q->t_root)); |
| 475 | if (last) { |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 476 | /* |
Johannes Naab | a13d310 | 2013-01-23 11:36:51 +0000 | [diff] [blame] | 477 | * Last packet in queue is reference point (now), |
| 478 | * calculate this time bonus and subtract |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 479 | * from delay. |
| 480 | */ |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 481 | delay -= netem_skb_cb(last)->time_to_send - now; |
Johannes Naab | a13d310 | 2013-01-23 11:36:51 +0000 | [diff] [blame] | 482 | delay = max_t(psched_tdiff_t, 0, delay); |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 483 | now = netem_skb_cb(last)->time_to_send; |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 484 | } |
Johannes Naab | a13d310 | 2013-01-23 11:36:51 +0000 | [diff] [blame] | 485 | |
| 486 | delay += packet_len_2_sched_time(skb->len, q); |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 487 | } |
| 488 | |
Patrick McHardy | 7c59e25 | 2007-03-23 11:27:45 -0700 | [diff] [blame] | 489 | cb->time_to_send = now + delay; |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 490 | cb->tstamp_save = skb->tstamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | ++q->counter; |
Eric Dumazet | 960fb66 | 2012-07-03 20:55:21 +0000 | [diff] [blame] | 492 | tfifo_enqueue(skb, sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | } else { |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 494 | /* |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 495 | * Do re-ordering by putting one out of N packets at the front |
| 496 | * of the queue. |
| 497 | */ |
Patrick McHardy | 3bebcda | 2007-03-23 11:29:25 -0700 | [diff] [blame] | 498 | cb->time_to_send = psched_get_time(); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 499 | q->counter = 0; |
Jarek Poplawski | 8ba25da | 2008-11-02 00:36:03 -0700 | [diff] [blame] | 500 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 501 | __skb_queue_head(&sch->q, skb); |
Hagen Paul Pfeifer | eb10192 | 2012-01-04 17:35:26 +0000 | [diff] [blame] | 502 | sch->qstats.requeues++; |
Jarek Poplawski | 378a2f0 | 2008-08-04 22:31:03 -0700 | [diff] [blame] | 503 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 505 | return NET_XMIT_SUCCESS; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | } |
| 507 | |
Eric Dumazet | cc7ec45 | 2011-01-19 19:26:56 +0000 | [diff] [blame] | 508 | static unsigned int netem_drop(struct Qdisc *sch) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | { |
| 510 | struct netem_sched_data *q = qdisc_priv(sch); |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 511 | unsigned int len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 513 | len = qdisc_queue_drop(sch); |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 514 | |
| 515 | if (!len) { |
| 516 | struct rb_node *p = rb_first(&q->t_root); |
| 517 | |
| 518 | if (p) { |
| 519 | struct sk_buff *skb = netem_rb_to_skb(p); |
| 520 | |
| 521 | rb_erase(p, &q->t_root); |
| 522 | sch->q.qlen--; |
| 523 | skb->next = NULL; |
| 524 | skb->prev = NULL; |
| 525 | len = qdisc_pkt_len(skb); |
| 526 | kfree_skb(skb); |
| 527 | } |
| 528 | } |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 529 | if (!len && q->qdisc && q->qdisc->ops->drop) |
| 530 | len = q->qdisc->ops->drop(q->qdisc); |
| 531 | if (len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | sch->qstats.drops++; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 533 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | return len; |
| 535 | } |
| 536 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | static struct sk_buff *netem_dequeue(struct Qdisc *sch) |
| 538 | { |
| 539 | struct netem_sched_data *q = qdisc_priv(sch); |
| 540 | struct sk_buff *skb; |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 541 | struct rb_node *p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | |
Eric Dumazet | fd245a4 | 2011-01-20 05:27:16 +0000 | [diff] [blame] | 543 | if (qdisc_is_throttled(sch)) |
Stephen Hemminger | 11274e5 | 2007-03-22 12:17:42 -0700 | [diff] [blame] | 544 | return NULL; |
| 545 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 546 | tfifo_dequeue: |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 547 | skb = __skb_dequeue(&sch->q); |
Stephen Hemminger | 771018e | 2005-05-03 16:24:32 -0700 | [diff] [blame] | 548 | if (skb) { |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 549 | deliver: |
| 550 | sch->qstats.backlog -= qdisc_pkt_len(skb); |
| 551 | qdisc_unthrottled(sch); |
| 552 | qdisc_bstats_update(sch, skb); |
| 553 | return skb; |
| 554 | } |
| 555 | p = rb_first(&q->t_root); |
| 556 | if (p) { |
Eric Dumazet | 36b7bfe | 2013-07-03 14:04:14 -0700 | [diff] [blame] | 557 | psched_time_t time_to_send; |
| 558 | |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 559 | skb = netem_rb_to_skb(p); |
Stephen Hemminger | 771018e | 2005-05-03 16:24:32 -0700 | [diff] [blame] | 560 | |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 561 | /* if more time remaining? */ |
Eric Dumazet | 36b7bfe | 2013-07-03 14:04:14 -0700 | [diff] [blame] | 562 | time_to_send = netem_skb_cb(skb)->time_to_send; |
| 563 | if (time_to_send <= psched_get_time()) { |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 564 | rb_erase(p, &q->t_root); |
| 565 | |
| 566 | sch->q.qlen--; |
| 567 | skb->next = NULL; |
| 568 | skb->prev = NULL; |
| 569 | skb->tstamp = netem_skb_cb(skb)->tstamp_save; |
Jarek Poplawski | 03c05f0 | 2008-10-31 00:46:19 -0700 | [diff] [blame] | 570 | |
Jarek Poplawski | 8caf153 | 2009-04-17 10:08:49 +0000 | [diff] [blame] | 571 | #ifdef CONFIG_NET_CLS_ACT |
| 572 | /* |
| 573 | * If it's at ingress let's pretend the delay is |
| 574 | * from the network (tstamp will be updated). |
| 575 | */ |
| 576 | if (G_TC_FROM(skb->tc_verd) & AT_INGRESS) |
| 577 | skb->tstamp.tv64 = 0; |
| 578 | #endif |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 579 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 580 | if (q->qdisc) { |
| 581 | int err = qdisc_enqueue(skb, q->qdisc); |
| 582 | |
| 583 | if (unlikely(err != NET_XMIT_SUCCESS)) { |
| 584 | if (net_xmit_drop_count(err)) { |
| 585 | sch->qstats.drops++; |
| 586 | qdisc_tree_decrease_qlen(sch, 1); |
| 587 | } |
| 588 | } |
| 589 | goto tfifo_dequeue; |
| 590 | } |
Eric Dumazet | aec0a40 | 2013-06-28 07:40:57 -0700 | [diff] [blame] | 591 | goto deliver; |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 592 | } |
Stephen Hemminger | 11274e5 | 2007-03-22 12:17:42 -0700 | [diff] [blame] | 593 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 594 | if (q->qdisc) { |
| 595 | skb = q->qdisc->ops->dequeue(q->qdisc); |
| 596 | if (skb) |
| 597 | goto deliver; |
| 598 | } |
Eric Dumazet | 36b7bfe | 2013-07-03 14:04:14 -0700 | [diff] [blame] | 599 | qdisc_watchdog_schedule(&q->watchdog, time_to_send); |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 600 | } |
| 601 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 602 | if (q->qdisc) { |
| 603 | skb = q->qdisc->ops->dequeue(q->qdisc); |
| 604 | if (skb) |
| 605 | goto deliver; |
| 606 | } |
Stephen Hemminger | 0f9f32a | 2005-05-26 12:55:01 -0700 | [diff] [blame] | 607 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | } |
| 609 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | static void netem_reset(struct Qdisc *sch) |
| 611 | { |
| 612 | struct netem_sched_data *q = qdisc_priv(sch); |
| 613 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 614 | qdisc_reset_queue(sch); |
| 615 | if (q->qdisc) |
| 616 | qdisc_reset(q->qdisc); |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 617 | qdisc_watchdog_cancel(&q->watchdog); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | } |
| 619 | |
stephen hemminger | 6373a9a | 2011-02-23 13:04:18 +0000 | [diff] [blame] | 620 | static void dist_free(struct disttable *d) |
| 621 | { |
| 622 | if (d) { |
| 623 | if (is_vmalloc_addr(d)) |
| 624 | vfree(d); |
| 625 | else |
| 626 | kfree(d); |
| 627 | } |
| 628 | } |
| 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | /* |
| 631 | * Distribution data is a variable size payload containing |
| 632 | * signed 16 bit values. |
| 633 | */ |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 634 | static int get_dist_table(struct Qdisc *sch, const struct nlattr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | { |
| 636 | struct netem_sched_data *q = qdisc_priv(sch); |
stephen hemminger | 6373a9a | 2011-02-23 13:04:18 +0000 | [diff] [blame] | 637 | size_t n = nla_len(attr)/sizeof(__s16); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 638 | const __s16 *data = nla_data(attr); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 639 | spinlock_t *root_lock; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | struct disttable *d; |
| 641 | int i; |
stephen hemminger | 6373a9a | 2011-02-23 13:04:18 +0000 | [diff] [blame] | 642 | size_t s; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | |
stephen hemminger | df173bd | 2011-02-23 13:04:19 +0000 | [diff] [blame] | 644 | if (n > NETEM_DIST_MAX) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | return -EINVAL; |
| 646 | |
stephen hemminger | 6373a9a | 2011-02-23 13:04:18 +0000 | [diff] [blame] | 647 | s = sizeof(struct disttable) + n * sizeof(s16); |
Eric Dumazet | bb52c7a | 2011-12-23 19:28:51 +0000 | [diff] [blame] | 648 | d = kmalloc(s, GFP_KERNEL | __GFP_NOWARN); |
stephen hemminger | 6373a9a | 2011-02-23 13:04:18 +0000 | [diff] [blame] | 649 | if (!d) |
| 650 | d = vmalloc(s); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | if (!d) |
| 652 | return -ENOMEM; |
| 653 | |
| 654 | d->size = n; |
| 655 | for (i = 0; i < n; i++) |
| 656 | d->table[i] = data[i]; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 657 | |
Jarek Poplawski | 102396a | 2008-08-29 14:21:52 -0700 | [diff] [blame] | 658 | root_lock = qdisc_root_sleeping_lock(sch); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 659 | |
| 660 | spin_lock_bh(root_lock); |
Eric Dumazet | bb52c7a | 2011-12-23 19:28:51 +0000 | [diff] [blame] | 661 | swap(q->delay_dist, d); |
David S. Miller | 7698b4f | 2008-07-16 01:42:40 -0700 | [diff] [blame] | 662 | spin_unlock_bh(root_lock); |
Eric Dumazet | bb52c7a | 2011-12-23 19:28:51 +0000 | [diff] [blame] | 663 | |
| 664 | dist_free(d); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | return 0; |
| 666 | } |
| 667 | |
Stephen Hemminger | 265eb67 | 2008-11-03 21:13:26 -0800 | [diff] [blame] | 668 | static void get_correlation(struct Qdisc *sch, const struct nlattr *attr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
| 670 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 671 | const struct tc_netem_corr *c = nla_data(attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | init_crandom(&q->delay_cor, c->delay_corr); |
| 674 | init_crandom(&q->loss_cor, c->loss_corr); |
| 675 | init_crandom(&q->dup_cor, c->dup_corr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | |
Stephen Hemminger | 265eb67 | 2008-11-03 21:13:26 -0800 | [diff] [blame] | 678 | static void get_reorder(struct Qdisc *sch, const struct nlattr *attr) |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 679 | { |
| 680 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 681 | const struct tc_netem_reorder *r = nla_data(attr); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 682 | |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 683 | q->reorder = r->probability; |
| 684 | init_crandom(&q->reorder_cor, r->correlation); |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Stephen Hemminger | 265eb67 | 2008-11-03 21:13:26 -0800 | [diff] [blame] | 687 | static void get_corrupt(struct Qdisc *sch, const struct nlattr *attr) |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 688 | { |
| 689 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 690 | const struct tc_netem_corrupt *r = nla_data(attr); |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 691 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 692 | q->corrupt = r->probability; |
| 693 | init_crandom(&q->corrupt_cor, r->correlation); |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 694 | } |
| 695 | |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 696 | static void get_rate(struct Qdisc *sch, const struct nlattr *attr) |
| 697 | { |
| 698 | struct netem_sched_data *q = qdisc_priv(sch); |
| 699 | const struct tc_netem_rate *r = nla_data(attr); |
| 700 | |
| 701 | q->rate = r->rate; |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 702 | q->packet_overhead = r->packet_overhead; |
| 703 | q->cell_size = r->cell_size; |
| 704 | if (q->cell_size) |
| 705 | q->cell_size_reciprocal = reciprocal_value(q->cell_size); |
| 706 | q->cell_overhead = r->cell_overhead; |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 707 | } |
| 708 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 709 | static int get_loss_clg(struct Qdisc *sch, const struct nlattr *attr) |
| 710 | { |
| 711 | struct netem_sched_data *q = qdisc_priv(sch); |
| 712 | const struct nlattr *la; |
| 713 | int rem; |
| 714 | |
| 715 | nla_for_each_nested(la, attr, rem) { |
| 716 | u16 type = nla_type(la); |
| 717 | |
| 718 | switch(type) { |
| 719 | case NETEM_LOSS_GI: { |
| 720 | const struct tc_netem_gimodel *gi = nla_data(la); |
| 721 | |
stephen hemminger | 2494654 | 2011-12-23 09:16:30 +0000 | [diff] [blame] | 722 | if (nla_len(la) < sizeof(struct tc_netem_gimodel)) { |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 723 | pr_info("netem: incorrect gi model size\n"); |
| 724 | return -EINVAL; |
| 725 | } |
| 726 | |
| 727 | q->loss_model = CLG_4_STATES; |
| 728 | |
| 729 | q->clg.state = 1; |
| 730 | q->clg.a1 = gi->p13; |
| 731 | q->clg.a2 = gi->p31; |
| 732 | q->clg.a3 = gi->p32; |
| 733 | q->clg.a4 = gi->p14; |
| 734 | q->clg.a5 = gi->p23; |
| 735 | break; |
| 736 | } |
| 737 | |
| 738 | case NETEM_LOSS_GE: { |
| 739 | const struct tc_netem_gemodel *ge = nla_data(la); |
| 740 | |
stephen hemminger | 2494654 | 2011-12-23 09:16:30 +0000 | [diff] [blame] | 741 | if (nla_len(la) < sizeof(struct tc_netem_gemodel)) { |
| 742 | pr_info("netem: incorrect ge model size\n"); |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 743 | return -EINVAL; |
| 744 | } |
| 745 | |
| 746 | q->loss_model = CLG_GILB_ELL; |
| 747 | q->clg.state = 1; |
| 748 | q->clg.a1 = ge->p; |
| 749 | q->clg.a2 = ge->r; |
| 750 | q->clg.a3 = ge->h; |
| 751 | q->clg.a4 = ge->k1; |
| 752 | break; |
| 753 | } |
| 754 | |
| 755 | default: |
| 756 | pr_info("netem: unknown loss type %u\n", type); |
| 757 | return -EINVAL; |
| 758 | } |
| 759 | } |
| 760 | |
| 761 | return 0; |
| 762 | } |
| 763 | |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 764 | static const struct nla_policy netem_policy[TCA_NETEM_MAX + 1] = { |
| 765 | [TCA_NETEM_CORR] = { .len = sizeof(struct tc_netem_corr) }, |
| 766 | [TCA_NETEM_REORDER] = { .len = sizeof(struct tc_netem_reorder) }, |
| 767 | [TCA_NETEM_CORRUPT] = { .len = sizeof(struct tc_netem_corrupt) }, |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 768 | [TCA_NETEM_RATE] = { .len = sizeof(struct tc_netem_rate) }, |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 769 | [TCA_NETEM_LOSS] = { .type = NLA_NESTED }, |
Eric Dumazet | e4ae004 | 2012-04-30 23:11:05 +0000 | [diff] [blame] | 770 | [TCA_NETEM_ECN] = { .type = NLA_U32 }, |
Patrick McHardy | 27a3421 | 2008-01-23 20:35:39 -0800 | [diff] [blame] | 771 | }; |
| 772 | |
Thomas Graf | 2c10b32 | 2008-09-02 17:30:27 -0700 | [diff] [blame] | 773 | static int parse_attr(struct nlattr *tb[], int maxtype, struct nlattr *nla, |
| 774 | const struct nla_policy *policy, int len) |
| 775 | { |
| 776 | int nested_len = nla_len(nla) - NLA_ALIGN(len); |
| 777 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 778 | if (nested_len < 0) { |
| 779 | pr_info("netem: invalid attributes len %d\n", nested_len); |
Thomas Graf | 2c10b32 | 2008-09-02 17:30:27 -0700 | [diff] [blame] | 780 | return -EINVAL; |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 781 | } |
| 782 | |
Thomas Graf | 2c10b32 | 2008-09-02 17:30:27 -0700 | [diff] [blame] | 783 | if (nested_len >= nla_attr_size(0)) |
| 784 | return nla_parse(tb, maxtype, nla_data(nla) + NLA_ALIGN(len), |
| 785 | nested_len, policy); |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 786 | |
Thomas Graf | 2c10b32 | 2008-09-02 17:30:27 -0700 | [diff] [blame] | 787 | memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1)); |
| 788 | return 0; |
| 789 | } |
| 790 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 791 | /* Parse netlink message to set options */ |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 792 | static int netem_change(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | { |
| 794 | struct netem_sched_data *q = qdisc_priv(sch); |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 795 | struct nlattr *tb[TCA_NETEM_MAX + 1]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | struct tc_netem_qopt *qopt; |
| 797 | int ret; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 798 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 799 | if (opt == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | return -EINVAL; |
| 801 | |
Thomas Graf | 2c10b32 | 2008-09-02 17:30:27 -0700 | [diff] [blame] | 802 | qopt = nla_data(opt); |
| 803 | ret = parse_attr(tb, TCA_NETEM_MAX, opt, netem_policy, sizeof(*qopt)); |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 804 | if (ret < 0) |
| 805 | return ret; |
| 806 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 807 | sch->limit = qopt->limit; |
YOSHIFUJI Hideaki | 10297b9 | 2007-02-09 23:25:16 +0900 | [diff] [blame] | 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | q->latency = qopt->latency; |
| 810 | q->jitter = qopt->jitter; |
| 811 | q->limit = qopt->limit; |
| 812 | q->gap = qopt->gap; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 813 | q->counter = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | q->loss = qopt->loss; |
| 815 | q->duplicate = qopt->duplicate; |
| 816 | |
Stephen Hemminger | bb2f8cc | 2007-03-23 00:12:09 -0700 | [diff] [blame] | 817 | /* for compatibility with earlier versions. |
| 818 | * if gap is set, need to assume 100% probability |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 819 | */ |
Stephen Hemminger | a362e0a | 2007-03-22 12:15:45 -0700 | [diff] [blame] | 820 | if (q->gap) |
| 821 | q->reorder = ~0; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 822 | |
Stephen Hemminger | 265eb67 | 2008-11-03 21:13:26 -0800 | [diff] [blame] | 823 | if (tb[TCA_NETEM_CORR]) |
| 824 | get_correlation(sch, tb[TCA_NETEM_CORR]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
Patrick McHardy | b03f467 | 2008-01-23 20:32:21 -0800 | [diff] [blame] | 826 | if (tb[TCA_NETEM_DELAY_DIST]) { |
| 827 | ret = get_dist_table(sch, tb[TCA_NETEM_DELAY_DIST]); |
| 828 | if (ret) |
| 829 | return ret; |
| 830 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | |
Stephen Hemminger | 265eb67 | 2008-11-03 21:13:26 -0800 | [diff] [blame] | 832 | if (tb[TCA_NETEM_REORDER]) |
| 833 | get_reorder(sch, tb[TCA_NETEM_REORDER]); |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 834 | |
Stephen Hemminger | 265eb67 | 2008-11-03 21:13:26 -0800 | [diff] [blame] | 835 | if (tb[TCA_NETEM_CORRUPT]) |
| 836 | get_corrupt(sch, tb[TCA_NETEM_CORRUPT]); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 838 | if (tb[TCA_NETEM_RATE]) |
| 839 | get_rate(sch, tb[TCA_NETEM_RATE]); |
| 840 | |
Eric Dumazet | e4ae004 | 2012-04-30 23:11:05 +0000 | [diff] [blame] | 841 | if (tb[TCA_NETEM_ECN]) |
| 842 | q->ecn = nla_get_u32(tb[TCA_NETEM_ECN]); |
| 843 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 844 | q->loss_model = CLG_RANDOM; |
| 845 | if (tb[TCA_NETEM_LOSS]) |
| 846 | ret = get_loss_clg(sch, tb[TCA_NETEM_LOSS]); |
| 847 | |
| 848 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | } |
| 850 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 851 | static int netem_init(struct Qdisc *sch, struct nlattr *opt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | { |
| 853 | struct netem_sched_data *q = qdisc_priv(sch); |
| 854 | int ret; |
| 855 | |
| 856 | if (!opt) |
| 857 | return -EINVAL; |
| 858 | |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 859 | qdisc_watchdog_init(&q->watchdog, sch); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 861 | q->loss_model = CLG_RANDOM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 862 | ret = netem_change(sch, opt); |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 863 | if (ret) |
stephen hemminger | 250a65f | 2011-02-23 13:04:22 +0000 | [diff] [blame] | 864 | pr_info("netem: change failed\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | return ret; |
| 866 | } |
| 867 | |
| 868 | static void netem_destroy(struct Qdisc *sch) |
| 869 | { |
| 870 | struct netem_sched_data *q = qdisc_priv(sch); |
| 871 | |
Patrick McHardy | 59cb5c6 | 2007-03-16 01:20:31 -0700 | [diff] [blame] | 872 | qdisc_watchdog_cancel(&q->watchdog); |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 873 | if (q->qdisc) |
| 874 | qdisc_destroy(q->qdisc); |
stephen hemminger | 6373a9a | 2011-02-23 13:04:18 +0000 | [diff] [blame] | 875 | dist_free(q->delay_dist); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | } |
| 877 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 878 | static int dump_loss_model(const struct netem_sched_data *q, |
| 879 | struct sk_buff *skb) |
| 880 | { |
| 881 | struct nlattr *nest; |
| 882 | |
| 883 | nest = nla_nest_start(skb, TCA_NETEM_LOSS); |
| 884 | if (nest == NULL) |
| 885 | goto nla_put_failure; |
| 886 | |
| 887 | switch (q->loss_model) { |
| 888 | case CLG_RANDOM: |
| 889 | /* legacy loss model */ |
| 890 | nla_nest_cancel(skb, nest); |
| 891 | return 0; /* no data */ |
| 892 | |
| 893 | case CLG_4_STATES: { |
| 894 | struct tc_netem_gimodel gi = { |
| 895 | .p13 = q->clg.a1, |
| 896 | .p31 = q->clg.a2, |
| 897 | .p32 = q->clg.a3, |
| 898 | .p14 = q->clg.a4, |
| 899 | .p23 = q->clg.a5, |
| 900 | }; |
| 901 | |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 902 | if (nla_put(skb, NETEM_LOSS_GI, sizeof(gi), &gi)) |
| 903 | goto nla_put_failure; |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 904 | break; |
| 905 | } |
| 906 | case CLG_GILB_ELL: { |
| 907 | struct tc_netem_gemodel ge = { |
| 908 | .p = q->clg.a1, |
| 909 | .r = q->clg.a2, |
| 910 | .h = q->clg.a3, |
| 911 | .k1 = q->clg.a4, |
| 912 | }; |
| 913 | |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 914 | if (nla_put(skb, NETEM_LOSS_GE, sizeof(ge), &ge)) |
| 915 | goto nla_put_failure; |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 916 | break; |
| 917 | } |
| 918 | } |
| 919 | |
| 920 | nla_nest_end(skb, nest); |
| 921 | return 0; |
| 922 | |
| 923 | nla_put_failure: |
| 924 | nla_nest_cancel(skb, nest); |
| 925 | return -1; |
| 926 | } |
| 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | static int netem_dump(struct Qdisc *sch, struct sk_buff *skb) |
| 929 | { |
| 930 | const struct netem_sched_data *q = qdisc_priv(sch); |
stephen hemminger | 861d7f7 | 2011-02-23 13:04:17 +0000 | [diff] [blame] | 931 | struct nlattr *nla = (struct nlattr *) skb_tail_pointer(skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | struct tc_netem_qopt qopt; |
| 933 | struct tc_netem_corr cor; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 934 | struct tc_netem_reorder reorder; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 935 | struct tc_netem_corrupt corrupt; |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 936 | struct tc_netem_rate rate; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | |
| 938 | qopt.latency = q->latency; |
| 939 | qopt.jitter = q->jitter; |
| 940 | qopt.limit = q->limit; |
| 941 | qopt.loss = q->loss; |
| 942 | qopt.gap = q->gap; |
| 943 | qopt.duplicate = q->duplicate; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 944 | if (nla_put(skb, TCA_OPTIONS, sizeof(qopt), &qopt)) |
| 945 | goto nla_put_failure; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | cor.delay_corr = q->delay_cor.rho; |
| 948 | cor.loss_corr = q->loss_cor.rho; |
| 949 | cor.dup_corr = q->dup_cor.rho; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 950 | if (nla_put(skb, TCA_NETEM_CORR, sizeof(cor), &cor)) |
| 951 | goto nla_put_failure; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 952 | |
| 953 | reorder.probability = q->reorder; |
| 954 | reorder.correlation = q->reorder_cor.rho; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 955 | if (nla_put(skb, TCA_NETEM_REORDER, sizeof(reorder), &reorder)) |
| 956 | goto nla_put_failure; |
Stephen Hemminger | 0dca51d | 2005-05-26 12:55:48 -0700 | [diff] [blame] | 957 | |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 958 | corrupt.probability = q->corrupt; |
| 959 | corrupt.correlation = q->corrupt_cor.rho; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 960 | if (nla_put(skb, TCA_NETEM_CORRUPT, sizeof(corrupt), &corrupt)) |
| 961 | goto nla_put_failure; |
Stephen Hemminger | c865e5d | 2005-12-21 19:03:44 -0800 | [diff] [blame] | 962 | |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 963 | rate.rate = q->rate; |
Hagen Paul Pfeifer | 90b41a1 | 2011-12-12 14:30:00 +0000 | [diff] [blame] | 964 | rate.packet_overhead = q->packet_overhead; |
| 965 | rate.cell_size = q->cell_size; |
| 966 | rate.cell_overhead = q->cell_overhead; |
David S. Miller | 1b34ec4 | 2012-03-29 05:11:39 -0400 | [diff] [blame] | 967 | if (nla_put(skb, TCA_NETEM_RATE, sizeof(rate), &rate)) |
| 968 | goto nla_put_failure; |
Hagen Paul Pfeifer | 7bc0f28 | 2011-11-30 12:20:26 +0000 | [diff] [blame] | 969 | |
Eric Dumazet | e4ae004 | 2012-04-30 23:11:05 +0000 | [diff] [blame] | 970 | if (q->ecn && nla_put_u32(skb, TCA_NETEM_ECN, q->ecn)) |
| 971 | goto nla_put_failure; |
| 972 | |
stephen hemminger | 661b797 | 2011-02-23 13:04:21 +0000 | [diff] [blame] | 973 | if (dump_loss_model(q, skb) != 0) |
| 974 | goto nla_put_failure; |
| 975 | |
stephen hemminger | 861d7f7 | 2011-02-23 13:04:17 +0000 | [diff] [blame] | 976 | return nla_nest_end(skb, nla); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | |
Patrick McHardy | 1e90474 | 2008-01-22 22:11:17 -0800 | [diff] [blame] | 978 | nla_put_failure: |
stephen hemminger | 861d7f7 | 2011-02-23 13:04:17 +0000 | [diff] [blame] | 979 | nlmsg_trim(skb, nla); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 980 | return -1; |
| 981 | } |
| 982 | |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 983 | static int netem_dump_class(struct Qdisc *sch, unsigned long cl, |
| 984 | struct sk_buff *skb, struct tcmsg *tcm) |
| 985 | { |
| 986 | struct netem_sched_data *q = qdisc_priv(sch); |
| 987 | |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 988 | if (cl != 1 || !q->qdisc) /* only one class */ |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 989 | return -ENOENT; |
| 990 | |
| 991 | tcm->tcm_handle |= TC_H_MIN(1); |
| 992 | tcm->tcm_info = q->qdisc->handle; |
| 993 | |
| 994 | return 0; |
| 995 | } |
| 996 | |
| 997 | static int netem_graft(struct Qdisc *sch, unsigned long arg, struct Qdisc *new, |
| 998 | struct Qdisc **old) |
| 999 | { |
| 1000 | struct netem_sched_data *q = qdisc_priv(sch); |
| 1001 | |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 1002 | sch_tree_lock(sch); |
| 1003 | *old = q->qdisc; |
| 1004 | q->qdisc = new; |
Eric Dumazet | 5061253 | 2011-12-28 23:12:02 +0000 | [diff] [blame] | 1005 | if (*old) { |
| 1006 | qdisc_tree_decrease_qlen(*old, (*old)->q.qlen); |
| 1007 | qdisc_reset(*old); |
| 1008 | } |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 1009 | sch_tree_unlock(sch); |
| 1010 | |
| 1011 | return 0; |
| 1012 | } |
| 1013 | |
| 1014 | static struct Qdisc *netem_leaf(struct Qdisc *sch, unsigned long arg) |
| 1015 | { |
| 1016 | struct netem_sched_data *q = qdisc_priv(sch); |
| 1017 | return q->qdisc; |
| 1018 | } |
| 1019 | |
| 1020 | static unsigned long netem_get(struct Qdisc *sch, u32 classid) |
| 1021 | { |
| 1022 | return 1; |
| 1023 | } |
| 1024 | |
| 1025 | static void netem_put(struct Qdisc *sch, unsigned long arg) |
| 1026 | { |
| 1027 | } |
| 1028 | |
| 1029 | static void netem_walk(struct Qdisc *sch, struct qdisc_walker *walker) |
| 1030 | { |
| 1031 | if (!walker->stop) { |
| 1032 | if (walker->count >= walker->skip) |
| 1033 | if (walker->fn(sch, 1, walker) < 0) { |
| 1034 | walker->stop = 1; |
| 1035 | return; |
| 1036 | } |
| 1037 | walker->count++; |
| 1038 | } |
| 1039 | } |
| 1040 | |
| 1041 | static const struct Qdisc_class_ops netem_class_ops = { |
| 1042 | .graft = netem_graft, |
| 1043 | .leaf = netem_leaf, |
| 1044 | .get = netem_get, |
| 1045 | .put = netem_put, |
| 1046 | .walk = netem_walk, |
| 1047 | .dump = netem_dump_class, |
| 1048 | }; |
| 1049 | |
Eric Dumazet | 20fea08 | 2007-11-14 01:44:41 -0800 | [diff] [blame] | 1050 | static struct Qdisc_ops netem_qdisc_ops __read_mostly = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | .id = "netem", |
stephen hemminger | 10f6dfc | 2011-02-23 13:04:20 +0000 | [diff] [blame] | 1052 | .cl_ops = &netem_class_ops, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1053 | .priv_size = sizeof(struct netem_sched_data), |
| 1054 | .enqueue = netem_enqueue, |
| 1055 | .dequeue = netem_dequeue, |
Jarek Poplawski | 77be155 | 2008-10-31 00:47:01 -0700 | [diff] [blame] | 1056 | .peek = qdisc_peek_dequeued, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | .drop = netem_drop, |
| 1058 | .init = netem_init, |
| 1059 | .reset = netem_reset, |
| 1060 | .destroy = netem_destroy, |
| 1061 | .change = netem_change, |
| 1062 | .dump = netem_dump, |
| 1063 | .owner = THIS_MODULE, |
| 1064 | }; |
| 1065 | |
| 1066 | |
| 1067 | static int __init netem_module_init(void) |
| 1068 | { |
Stephen Hemminger | eb229c4 | 2005-11-03 13:49:01 -0800 | [diff] [blame] | 1069 | pr_info("netem: version " VERSION "\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | return register_qdisc(&netem_qdisc_ops); |
| 1071 | } |
| 1072 | static void __exit netem_module_exit(void) |
| 1073 | { |
| 1074 | unregister_qdisc(&netem_qdisc_ops); |
| 1075 | } |
| 1076 | module_init(netem_module_init) |
| 1077 | module_exit(netem_module_exit) |
| 1078 | MODULE_LICENSE("GPL"); |