target/linux/generic/patches-3.12/621-sched_act_connmark.patch

   1 --- /dev/null
   2 +++ b/net/sched/act_connmark.c
   3 @@ -0,0 +1,148 @@
   4 +/*
   5 + * Copyright (c) 2011 Felix Fietkau <nbd@openwrt.org>
   6 + *
   7 + * This program is free software; you can redistribute it and/or modify it
   8 + * under the terms and conditions of the GNU General Public License,
   9 + * version 2, as published by the Free Software Foundation.
  10 + *
  11 + * This program is distributed in the hope it will be useful, but WITHOUT
  12 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14 + * more details.
  15 + *
  16 + * You should have received a copy of the GNU General Public License along with
  17 + * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  18 + * Place - Suite 330, Boston, MA 02111-1307 USA.
  19 + */
  20 +
  21 +#include <linux/module.h>
  22 +#include <linux/init.h>
  23 +#include <linux/kernel.h>
  24 +#include <linux/skbuff.h>
  25 +#include <linux/rtnetlink.h>
  26 +#include <linux/pkt_cls.h>
  27 +#include <linux/ip.h>
  28 +#include <linux/ipv6.h>
  29 +#include <net/netlink.h>
  30 +#include <net/pkt_sched.h>
  31 +#include <net/act_api.h>
  32 +
  33 +#include <net/netfilter/nf_conntrack.h>
  34 +#include <net/netfilter/nf_conntrack_core.h>
  35 +
  36 +#define TCA_ACT_CONNMARK       20
  37 +
  38 +#define CONNMARK_TAB_MASK     3
  39 +static struct tcf_common *tcf_connmark_ht[CONNMARK_TAB_MASK + 1];
  40 +static u32 connmark_idx_gen;
  41 +static DEFINE_RWLOCK(connmark_lock);
  42 +
  43 +static struct tcf_hashinfo connmark_hash_info = {
  44 +       .htab   =       tcf_connmark_ht,
  45 +       .hmask  =       CONNMARK_TAB_MASK,
  46 +       .lock   =       &connmark_lock,
  47 +};
  48 +
  49 +static int tcf_connmark(struct sk_buff *skb, const struct tc_action *a,
  50 +                      struct tcf_result *res)
  51 +{
  52 +       struct nf_conn *c;
  53 +       enum ip_conntrack_info ctinfo;
  54 +       int proto;
  55 +       int r;
  56 +
  57 +       if (skb->protocol == htons(ETH_P_IP)) {
  58 +               if (skb->len < sizeof(struct iphdr))
  59 +                       goto out;
  60 +               proto = PF_INET;
  61 +       } else if (skb->protocol == htons(ETH_P_IPV6)) {
  62 +               if (skb->len < sizeof(struct ipv6hdr))
  63 +                       goto out;
  64 +               proto = PF_INET6;
  65 +       } else
  66 +               goto out;
  67 +
  68 +       r = nf_conntrack_in(dev_net(skb->dev), proto, NF_INET_PRE_ROUTING, skb);
  69 +       if (r != NF_ACCEPT)
  70 +               goto out;
  71 +
  72 +       c = nf_ct_get(skb, &ctinfo);
  73 +       if (!c)
  74 +               goto out;
  75 +
  76 +       skb->mark = c->mark;
  77 +       nf_conntrack_put(skb->nfct);
  78 +       skb->nfct = NULL;
  79 +
  80 +out:
  81 +       return TC_ACT_PIPE;
  82 +}
  83 +
  84 +static int tcf_connmark_init(struct net *net, struct nlattr *nla,
  85 +                            struct nlattr *est, struct tc_action *a,
  86 +                            int ovr, int bind)
  87 +{
  88 +       struct tcf_common *pc;
  89 +       int ret = 0;
  90 +
  91 +       pc = tcf_hash_check(0, a, bind, &connmark_hash_info);
  92 +       if (!pc) {
  93 +               pc = tcf_hash_create(0, est, a, sizeof(*pc), bind,
  94 +                                    &connmark_idx_gen, &connmark_hash_info);
  95 +               if (IS_ERR(pc))
  96 +                   return PTR_ERR(pc);
  97 +
  98 +               tcf_hash_insert(pc, &connmark_hash_info);
  99 +               ret = ACT_P_CREATED;
 100 +       } else {
 101 +               if (!ovr) {
 102 +                       tcf_hash_release(pc, bind, &connmark_hash_info);
 103 +                       return -EEXIST;
 104 +               }
 105 +       }
 106 +
 107 +       return ret;
 108 +}
 109 +
 110 +static inline int tcf_connmark_cleanup(struct tc_action *a, int bind)
 111 +{
 112 +       if (a->priv)
 113 +               return tcf_hash_release(a->priv, bind, &connmark_hash_info);
 114 +       return 0;
 115 +}
 116 +
 117 +static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
 118 +                               int bind, int ref)
 119 +{
 120 +       return skb->len;
 121 +}
 122 +
 123 +static struct tc_action_ops act_connmark_ops = {
 124 +       .kind           =       "connmark",
 125 +       .hinfo          =       &connmark_hash_info,
 126 +       .type           =       TCA_ACT_CONNMARK,
 127 +       .capab          =       TCA_CAP_NONE,
 128 +       .owner          =       THIS_MODULE,
 129 +       .act            =       tcf_connmark,
 130 +       .dump           =       tcf_connmark_dump,
 131 +       .cleanup        =       tcf_connmark_cleanup,
 132 +       .init           =       tcf_connmark_init,
 133 +       .walk           =       tcf_generic_walker,
 134 +};
 135 +
 136 +MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
 137 +MODULE_DESCRIPTION("Connection tracking mark restoring");
 138 +MODULE_LICENSE("GPL");
 139 +
 140 +static int __init connmark_init_module(void)
 141 +{
 142 +       return tcf_register_action(&act_connmark_ops);
 143 +}
 144 +
 145 +static void __exit connmark_cleanup_module(void)
 146 +{
 147 +       tcf_unregister_action(&act_connmark_ops);
 148 +}
 149 +
 150 +module_init(connmark_init_module);
 151 +module_exit(connmark_cleanup_module);
 152 --- a/net/sched/Kconfig
 153 +++ b/net/sched/Kconfig
 154 @@ -684,6 +684,19 @@ config NET_ACT_CSUM
 155           To compile this code as a module, choose M here: the
 156           module will be called act_csum.
 157
 158 +config NET_ACT_CONNMARK
 159 +        tristate "Connection Tracking Marking"
 160 +        depends on NET_CLS_ACT
 161 +        depends on NF_CONNTRACK
 162 +        depends on NF_CONNTRACK_MARK
 163 +        ---help---
 164 +         Say Y here to restore the connmark from a scheduler action
 165 +
 166 +         If unsure, say N.
 167 +
 168 +         To compile this code as a module, choose M here: the
 169 +         module will be called act_connmark.
 170 +
 171  config NET_CLS_IND
 172         bool "Incoming device classification"
 173         depends on NET_CLS_U32 || NET_CLS_FW
 174 --- a/net/sched/Makefile
 175 +++ b/net/sched/Makefile
 176 @@ -16,6 +16,7 @@ obj-$(CONFIG_NET_ACT_PEDIT)   += act_pedit
 177  obj-$(CONFIG_NET_ACT_SIMP)     += act_simple.o
 178  obj-$(CONFIG_NET_ACT_SKBEDIT)  += act_skbedit.o
 179  obj-$(CONFIG_NET_ACT_CSUM)     += act_csum.o
 180 +obj-$(CONFIG_NET_ACT_CONNMARK) += act_connmark.o
 181  obj-$(CONFIG_NET_SCH_FIFO)     += sch_fifo.o
 182  obj-$(CONFIG_NET_SCH_CBQ)      += sch_cbq.o
 183  obj-$(CONFIG_NET_SCH_HTB)      += sch_htb.o