net/sqm-scripts/files/usr/lib/sqm/simple_pppoe.qos

   1 #!/bin/sh
   2 # Cero3 Shaper
   3 # A 3 bin tc_codel and ipv6 enabled shaping script for
   4 # ethernet gateways
   5
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License version 2 as
   8 # published by the Free Software Foundation.
   9 #
  10 #       Copyright (C) 2012-4 Michael D. Taht, Toke Høiland-Jørgensen, Sebastian Moeller
  11
  12 # Compared to the complexity that debloat had become
  13 # this cleanly shows a means of going from diffserv marking
  14 # to prioritization using the current tools (ip(6)tables
  15 # and tc. I note that the complexity of debloat exists for
  16 # a reason, and it is expected that script is run first
  17 # to setup various other parameters such as BQL and ethtool.
  18 # (And that the debloat script has setup the other interfaces)
  19
  20 # You need to jiggle these parameters. Note limits are tuned towards a <10Mbit uplink <60Mbup down
  21
  22 #sm: Goal to create a set of tc filters that also apply on pppoe encapsulated packets
  23 #       but having multiple filters run in succession is slow, so look at tc filter hashing
  24 #       (this should help cut down the number of OPs per packet considerably)
  25
  26
  27 . /usr/lib/sqm/functions.sh
  28 #sqm_logger IPT_MASK: ${IPT_MASK_STRING}
  29 ipt_setup() {
  30
  31 ipt -t mangle -N QOS_MARK_${IFACE}
  32
  33 ipt -t mangle -A QOS_MARK_${IFACE} -j MARK --set-mark 0x2${IPT_MASK_STRING}
  34 # You can go further with classification but...
  35 ipt -t mangle -A QOS_MARK_${IFACE} -m dscp --dscp-class CS1 -j MARK --set-mark 0x3${IPT_MASK_STRING}
  36 ipt -t mangle -A QOS_MARK_${IFACE} -m dscp --dscp-class CS6 -j MARK --set-mark 0x1${IPT_MASK_STRING}
  37 ipt -t mangle -A QOS_MARK_${IFACE} -m dscp --dscp-class EF -j MARK --set-mark 0x1${IPT_MASK_STRING}
  38 ipt -t mangle -A QOS_MARK_${IFACE} -m dscp --dscp-class AF42 -j MARK --set-mark 0x1${IPT_MASK_STRING}
  39 ipt -t mangle -A QOS_MARK_${IFACE} -m tos  --tos Minimize-Delay -j MARK --set-mark 0x1${IPT_MASK_STRING}
  40
  41 # and it might be a good idea to do it for udp tunnels too
  42
  43 # Turn it on. Preserve classification if already performed
  44
  45 if [ "$SQUASH_DSCP" = "1" ]
  46 then
  47 sqm_logger "Squashing differentiated services code points (DSCP) from ingress."
  48 ipt -t mangle -I PREROUTING -i $IFACE -m dscp ! --dscp 0 -j DSCP --set-dscp-class be
  49 else
  50 sqm_logger "Keeping differentiad services code points (DSCP) from ingress."
  51 ipt -t mangle -A PREROUTING -i $IFACE -m mark --mark 0x00${IPT_MASK_STRING} -g QOS_MARK_${IFACE}
  52 fi
  53
  54 ipt -t mangle -A POSTROUTING -o $IFACE -m mark --mark 0x00${IPT_MASK_STRING} -g QOS_MARK_${IFACE}
  55
  56 # The Syn optimization was nice but fq_codel does it for us
  57 # ipt -t mangle -A PREROUTING -i s+ -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x01
  58 # Not sure if this will work. Encapsulation is a problem period
  59
  60 ipt -t mangle -I PREROUTING -i vtun+ -p tcp -j MARK --set-mark 0x2${IPT_MASK_STRING} # tcp tunnels need ordering
  61
  62 # Emanating from router, do a little more optimization
  63 # but don't bother with it too much.
  64
  65 ipt -t mangle -A OUTPUT -p udp -m multiport --ports 123,53 -j DSCP --set-dscp-class AF42
  66
  67 #Not clear if the second line is needed
  68 #ipt -t mangle -A OUTPUT -o $IFACE -g QOS_MARK_${IFACE}
  69
  70 }
  71
  72
  73 MYBURST=1600    #sm: make burst and cburst as well as quantum configurable for ingress and egress in the GUI
  74 # TC rules
  75
  76 egress() {
  77
  78 CEIL=${UPLINK}
  79 PRIO_RATE=`expr $CEIL / 3` # Ceiling for priority
  80 BE_RATE=`expr $CEIL / 6`   # Min for best effort
  81 BK_RATE=`expr $CEIL / 6`   # Min for background
  82 BE_CEIL=`expr $CEIL - 16`  # A little slop at the top
  83
  84 LQ="quantum `get_mtu $IFACE $CEIL`"
  85 HTB_BURSTS="burst ${MYBURST} cburst ${MYBURST}"
  86
  87 $TC qdisc del dev $IFACE root 2> /dev/null
  88 $TC qdisc add dev $IFACE root handle 1: `get_stab_string` htb default 12
  89 $TC class add dev $IFACE parent 1: classid 1:1 htb $LQ ${HTB_BURSTS} rate ${CEIL}kbit ceil ${CEIL}kbit `get_htb_adsll_string`
  90 $TC class add dev $IFACE parent 1:1 classid 1:10 htb $LQ ${HTB_BURSTS} rate ${CEIL}kbit ceil ${CEIL}kbit prio 0 `get_htb_adsll_string`
  91 $TC class add dev $IFACE parent 1:1 classid 1:11 htb $LQ ${HTB_BURSTS} rate 128kbit ceil ${PRIO_RATE}kbit prio 1 `get_htb_adsll_string`
  92 $TC class add dev $IFACE parent 1:1 classid 1:12 htb $LQ ${HTB_BURSTS} rate ${BE_RATE}kbit ceil ${BE_CEIL}kbit prio 2 `get_htb_adsll_string`
  93 $TC class add dev $IFACE parent 1:1 classid 1:13 htb $LQ ${HTB_BURSTS} rate ${BK_RATE}kbit ceil ${BE_CEIL}kbit prio 3 `get_htb_adsll_string`
  94
  95 $TC qdisc add dev $IFACE parent 1:11 handle 110: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${PRIO_RATE}` ${EQDISC_OPTS}
  96 $TC qdisc add dev $IFACE parent 1:12 handle 120: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${BE_RATE}` ${EQDISC_OPTS}
  97 $TC qdisc add dev $IFACE parent 1:13 handle 130: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${BK_RATE}` ${EQDISC_OPTS}
  98
  99
 100 #sm: for testing we need a band to collect PPPOEd packets
 101 $TC class add dev $IFACE parent 1:1 classid 1:14 htb $LQ rate ${BE_RATE}kbit ceil ${BE_CEIL}kbit prio 2 `get_htb_adsll_string`
 102 $TC qdisc add dev $IFACE parent 1:14 handle 140: $QDISC `get_limit ${ELIMIT}` `get_target "${ETARGET}" ${UPLINK}` `get_ecn ${EECN}` `get_quantum 300` `get_flows ${BK_RATE}` ${EQDISC_OPTS}
 103
 104
 105 # Need a catchall rule (should also match VLANs and PPPoE packets)
 106
 107 $TC filter add dev $IFACE parent 1:0 protocol all prio 999 u32 \
 108         match ip protocol 0 0x00 flowid 1:12
 109
 110 # FIXME should probably change the filter here to do pre-nat
 111
 112 $TC filter add dev $IFACE parent 1:0 protocol ip prio 1 handle 1 fw classid 1:11
 113 $TC filter add dev $IFACE parent 1:0 protocol ip prio 2 handle 2 fw classid 1:12
 114 $TC filter add dev $IFACE parent 1:0 protocol ip prio 3 handle 3 fw classid 1:13
 115
 116 # ipv6 support. Note that the handle indicates the fw mark bucket that is looked for
 117
 118 $TC filter add dev $IFACE parent 1:0 protocol ipv6 prio 4 handle 1 fw classid 1:11
 119 $TC filter add dev $IFACE parent 1:0 protocol ipv6 prio 5 handle 2 fw classid 1:12
 120 $TC filter add dev $IFACE parent 1:0 protocol ipv6 prio 6 handle 3 fw classid 1:13
 121
 122 # Arp traffic
 123
 124 $TC filter add dev $IFACE parent 1:0 protocol arp prio 7 handle 1 fw classid 1:11
 125
 126 # ICMP traffic - Don't impress your friends. Deoptimize to manage ping floods
 127 # better instead
 128
 129 $TC filter add dev $IFACE parent 1:0 protocol ip prio 8 \
 130          u32 match ip protocol 1 0xff flowid 1:13
 131
 132 $TC filter add dev $IFACE parent 1:0 protocol ipv6 prio 9 \
 133          u32 match ip protocol 1 0xff flowid 1:13
 134
 135
 136
 137
 138 # PPPoE encapsulated packets traversing the router (e.g.: the router does PPPoE termination but we shape
 139 # on the underlaying ethernet interface instead of the pppoe device)
 140
 141 PPPOE_SESSION_ETHERTYPE="0x8864"
 142 PPPOE_DISCOVERY_ETHERTYPE="0x8863"
 143 PPP_PROTO_IP4="0x0021"
 144 PPP_PROTO_IP6="0x0057"
 145 ARP_PROTO_IP4="0x0806"
 146
 147 # NOTE it seems prio can not be reused?
 148 #$TC filter add dev $IFACE protocol 0x8863 parent 1:0 prio 1 u32 flowid 1:14
 149 # PPPoE can be selected for by ether_type, the encapsulated IP version from the PPP (0x0021 IPv4, 0x0057 IPv6)
 150 #U32_PREFIX="$TC filter add dev $IFACE" parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE}"
 151
 152 #BE: 1:12 is the default anyway, but this will catch all non marked packets
 153 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 400 u32 \
 154 #       match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 155 #       match u8 0x00 0xfb at 9 \
 156 #       flowid 1:12
 157
 158 #AF42
 159 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 401 u32 \
 160         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 161         match u8 0x90 0xfc at 9 \
 162         flowid 1:11
 163 #EF
 164 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 402 u32 \
 165         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 166         match u8 0xb8 0xfc at 9 \
 167         flowid 1:11
 168 #CS1
 169 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 403 u32 \
 170         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 171         match u8 0x20 0xf0 at 9 \
 172         flowid 1:13
 173 #IMM
 174 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 404 u32 \
 175         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 176         match u8 0x10 0xf0 at 9 \
 177         flowid 1:11
 178 #CS3
 179 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 405 u32 \
 180         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 181         match u8 0xc0 0xf0 at 9 \
 182         flowid 1:11
 183 #CS6
 184 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 406 u32 \
 185         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 186         match u8 0xe0 0xf0 at 9 \
 187         flowid 1:11
 188
 189
 190 ## Arp traffic
 191 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 409 u32 \
 192 #       match u16 ${ARP_PROTO_IP4} 0xffff at 6 \
 193 #       flowid 1:14
 194
 195 # ICMP traffic - Don't impress your friends. Deoptimize to manage ping floods
 196 # better instead; sm: really only deprio echo requestst and echo replies instead?
 197 # ECHO request, the rest stays in best effort
 198 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 410 u32 \
 199         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 200         match u8 0x01 0xff at 17 \
 201         match u8 0x08 0xff at 28 \
 202         flowid 1:13
 203 # ECHO reply
 204 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 410 u32 \
 205         match u16 ${PPP_PROTO_IP4} 0xffff at 6 \
 206         match u8 0x01 0xff at 17 \
 207         match u8 0x00 0xff at 28 \
 208         flowid 1:13
 209
 210 ## ICMPv6 133-137 (NDP) is equivalent to IPv4 ARP, so only push echo request and reply into the bulk class
 211 ## 133
 212 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 213 #       match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 214 #       match u8 0x85 0xff at 48 \
 215 #       match u8 0x3a 0xff at 14 \
 216 #       flowid 1:14
 217 ## 134
 218 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 219 #       match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 220 #       match u8 0x86 0xff at 48 \
 221 #       match u8 0x3a 0xff at 14 \
 222 #       flowid 1:14
 223 ## 135
 224 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 225 #       match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 226 #       match u8 0x87 0xff at 48 \
 227 #       match u8 0x3a 0xff at 14 \
 228 #       flowid 1:14
 229 ## 136
 230 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 231 #       match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 232 #       match u8 0x88 0xff at 48 \
 233 #       match u8 0x3a 0xff at 14 \
 234 #       flowid 1:14
 235 ## 137
 236 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 237 #       match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 238 #       match u8 0x89 0xff at 48 \
 239 #       match u8 0x3a 0xff at 14 \
 240 #       flowid 1:14
 241
 242 # ICMPv6 echo request
 243 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 244         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 245         match u8 0x3a 0xff at 14 \
 246         match u8 0x80 0xff at 48 \
 247         flowid 1:13
 248 # ICMPv6 echo reply
 249 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 610 u32 \
 250         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 251         match u8 0x3a 0xff at 14 \
 252         match u8 0x81 0xff at 48 \
 253         flowid 1:13
 254
 255
 256
 257
 258 #IPV6
 259 #BE: careful, will override ICMP
 260 #$TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 600 u32 \
 261 #       match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 262 #       match u16 0x0000 0x0fb0 at 8 \
 263 #       flowid 1:12
 264 #AF42
 265 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 601 u32 \
 266         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 267         match u16 0x0900 0x0fc0 at 8 \
 268         flowid 1:11
 269 #EF
 270 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 602 u32 \
 271         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 272         match u16 0x0b80 0x0fc0 at 8 \
 273         flowid 1:11
 274 #CS1
 275 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 603 u32 \
 276         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 277         match u16 0x0200 0x0fc0 at 8 \
 278         flowid 1:13
 279 #IMM
 280 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 604 u32 \
 281         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 282         match u16 0x0100 0x0fc0 at 8 \
 283         flowid 1:11
 284 #CS3
 285 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 605 u32 \
 286         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 287         match u16 0x0c00 0x0fc0 at 8 \
 288         flowid 1:11
 289 #CS6
 290 $TC filter add dev $IFACE parent 1:0 protocol ${PPPOE_SESSION_ETHERTYPE} prio 606 u32 \
 291         match u16 ${PPP_PROTO_IP6} 0xffff at 6 \
 292         match u16 0x0e00 0x0fc0 at 8 \
 293         flowid 1:11
 294
 295
 296
 297
 298 #diffserv $IFACE
 299
 300 }
 301
 302 ingress() {
 303
 304 CEIL=$DOWNLINK
 305 PRIO_RATE=`expr $CEIL / 3` # Ceiling for prioirty
 306 BE_RATE=`expr $CEIL / 6`   # Min for best effort
 307 BK_RATE=`expr $CEIL / 6`   # Min for background
 308 BE_CEIL=`expr $CEIL - 16`  # A little slop at the top
 309
 310 LQ="quantum `get_mtu $IFACE $CEIL`"
 311 HTB_BURSTS="burst ${MYBURST} cburst ${MYBURST}"
 312
 313 $TC qdisc del dev $IFACE handle ffff: ingress 2> /dev/null
 314 $TC qdisc add dev $IFACE handle ffff: ingress
 315
 316 $TC qdisc del dev $DEV root  2> /dev/null
 317
 318 if [ "$SQUASH_INGRESS" = "1" ]
 319 then
 320 sqm_logger "Do not perform DSCP based filtering on ingress. (1-tier classification)"
 321 # Revert to no dscp based filtering
 322 $TC qdisc del dev $DEV root 2>/dev/null
 323 $TC qdisc add dev $DEV root handle 1: `get_stab_string` htb default 10
 324 $TC class add dev $DEV parent 1: classid 1:1 htb $LQ ${HTB_BURSTS} rate ${DOWNLINK}kbit ceil ${DOWNLINK}kbit `get_htb_adsll_string`
 325 $TC class add dev $DEV parent 1:1 classid 1:10 htb $LQ ${HTB_BURSTS} rate ${DOWNLINK}kbit ceil ${DOWNLINK}kbit prio 0 `get_htb_adsll_string`
 326 $TC qdisc add dev $DEV parent 1:10 handle 110: $QDISC `get_limit ${ILIMIT}` `get_target "${ITARGET}" ${DOWNLINK}` `get_ecn ${IECN}` `get_flows ${DOWNLINK}` ${IQDISC_OPTS}
 327
 328 else
 329 sqm_logger "Perform DSCP based filtering on ingress. (3-tier classification)"
 330 $TC qdisc add dev $DEV root handle 1: `get_stab_string` htb default 12
 331 $TC class add dev $DEV parent 1: classid 1:1 htb $LQ ${HTB_BURSTS} rate ${CEIL}kbit ceil ${CEIL}kbit `get_htb_adsll_string`
 332 $TC class add dev $DEV parent 1:1 classid 1:10 htb $LQ ${HTB_BURSTS} rate ${CEIL}kbit ceil ${CEIL}kbit prio 0 `get_htb_adsll_string`
 333 $TC class add dev $DEV parent 1:1 classid 1:11 htb $LQ ${HTB_BURSTS} rate 32kbit ceil ${PRIO_RATE}kbit prio 1 `get_htb_adsll_string`
 334 $TC class add dev $DEV parent 1:1 classid 1:12 htb $LQ ${HTB_BURSTS} rate ${BE_RATE}kbit ceil ${BE_CEIL}kbit prio 2 `get_htb_adsll_string`
 335 $TC class add dev $DEV parent 1:1 classid 1:13 htb $LQ ${HTB_BURSTS} rate ${BK_RATE}kbit ceil ${BE_CEIL}kbit prio 3 `get_htb_adsll_string`
 336
 337 # I'd prefer to use a pre-nat filter but that causes permutation...
 338
 339 $TC qdisc add dev $DEV parent 1:11 handle 110: $QDISC `get_limit ${ILIMIT}` `get_target "${ITARGET}" ${DOWNLINK}` `get_ecn ${IECN}` `get_quantum 500` `get_flows ${PRIO_RATE}` ${IQDISC_OPTS}
 340 $TC qdisc add dev $DEV parent 1:12 handle 120: $QDISC `get_limit ${ILIMIT}` `get_target "${ITARGET}" ${DOWNLINK}` `get_ecn ${IECN}` `get_quantum 1500` `get_flows ${BE_RATE}` ${IQDISC_OPTS}
 341 $TC qdisc add dev $DEV parent 1:13 handle 130: $QDISC `get_limit ${ILIMIT}` `get_target "${ITARGET}" ${DOWNLINK}` `get_ecn ${IECN}` `get_quantum 300` `get_flows ${BK_RATE}` ${IQDISC_OPTS}
 342
 343 #sm: for PPPoE packet testing
 344 $TC class add dev $DEV parent 1:1 classid 1:14 htb $LQ rate ${BK_RATE}kbit ceil ${BE_CEIL}kbit prio 3 `get_htb_adsll_string`
 345 $TC qdisc add dev $DEV parent 1:14 handle 140: $QDISC `get_limit ${ILIMIT}` `get_target "${ITARGET}" ${DOWNLINK}` `get_ecn ${IECN}` `get_quantum 300` `get_flows ${BK_RATE}` ${IQDISC_OPTS}
 346
 347
 348
 349 #diffserv $DEV
 350 diffserv_pppoe $DEV
 351
 352 fi
 353
 354 ifconfig $DEV up
 355
 356 # redirect all IP packets arriving in $IFACE to ifb0
 357
 358 $TC filter add dev $IFACE parent ffff: protocol all prio 10 u32 \
 359   match u32 0 0 flowid 1:1 action mirred egress redirect dev $DEV
 360
 361 }
 362
 363 do_modules
 364 ipt_setup
 365
 366 if [ "$UPLINK" -ne 0 ];
 367 then
 368         egress
 369         sqm_logger "egress shaping activated"
 370 else
 371         sqm_logger "egress shaping deactivated"
 372         tc qdisc del dev $IFACE root 2> /dev/null
 373 fi
 374 if [ "$DOWNLINK" -ne 0 ];
 375 then
 376         ingress
 377         sqm_logger "ingress shaping activated"
 378 else
 379         sqm_logger "ingress shaping deactivated"
 380         tc qdisc del dev $DEV root 2> /dev/null
 381         tc qdisc del dev $IFACE ingress 2> /dev/null
 382 fi
 383
 384
 385
 386 # References:
 387 # This alternate shaper attempts to go for 1/u performance in a clever way
 388 # http://git.coverfire.com/?p=linux-qos-scripts.git;a=blob;f=src-3tos.sh;hb=HEAD
 389
 390 # Comments
 391 # This does the right thing with ipv6 traffic.
 392 # It also tries to leverage diffserv to some sane extent. In particular,
 393 # the 'priority' queue is limited to 33% of the total, so EF, and IMM traffic
 394 # cannot starve other types. The rfc suggested 30%. 30% is probably
 395 # a lot in today's world.
 396
 397 # Flaws
 398 # Many!