target/linux/generic/patches-3.2/621-sched_act_connmark.patch

   1 --- /dev/null
   2 +++ b/net/sched/act_connmark.c
   3 @@ -0,0 +1,137 @@
   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, 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 nlattr *nla, struct nlattr *est,
  85 +                        struct tc_action *a, int ovr, int bind)
  86 +{
  87 +       struct tcf_common *pc;
  88 +
  89 +       pc = tcf_hash_create(0, est, a, sizeof(*pc), bind,
  90 +                            &connmark_idx_gen, &connmark_hash_info);
  91 +       if (IS_ERR(pc))
  92 +           return PTR_ERR(pc);
  93 +
  94 +       tcf_hash_insert(pc, &connmark_hash_info);
  95 +
  96 +       return ACT_P_CREATED;
  97 +}
  98 +
  99 +static inline int tcf_connmark_cleanup(struct tc_action *a, int bind)
 100 +{
 101 +       if (a->priv)
 102 +               return tcf_hash_release(a->priv, bind, &connmark_hash_info);
 103 +       return 0;
 104 +}
 105 +
 106 +static inline int tcf_connmark_dump(struct sk_buff *skb, struct tc_action *a,
 107 +                               int bind, int ref)
 108 +{
 109 +       return skb->len;
 110 +}
 111 +
 112 +static struct tc_action_ops act_connmark_ops = {
 113 +       .kind           =       "connmark",
 114 +       .hinfo          =       &connmark_hash_info,
 115 +       .type           =       TCA_ACT_CONNMARK,
 116 +       .capab          =       TCA_CAP_NONE,
 117 +       .owner          =       THIS_MODULE,
 118 +       .act            =       tcf_connmark,
 119 +       .dump           =       tcf_connmark_dump,
 120 +       .cleanup        =       tcf_connmark_cleanup,
 121 +       .init           =       tcf_connmark_init,
 122 +       .walk           =       tcf_generic_walker,
 123 +};
 124 +
 125 +MODULE_AUTHOR("Felix Fietkau <nbd@openwrt.org>");
 126 +MODULE_DESCRIPTION("Connection tracking mark restoring");
 127 +MODULE_LICENSE("GPL");
 128 +
 129 +static int __init connmark_init_module(void)
 130 +{
 131 +       return tcf_register_action(&act_connmark_ops);
 132 +}
 133 +
 134 +static void __exit connmark_cleanup_module(void)
 135 +{
 136 +       tcf_unregister_action(&act_connmark_ops);
 137 +}
 138 +
 139 +module_init(connmark_init_module);
 140 +module_exit(connmark_cleanup_module);
 141 --- a/net/sched/Kconfig
 142 +++ b/net/sched/Kconfig
 143 @@ -602,6 +602,19 @@ config NET_ACT_CSUM
 144           To compile this code as a module, choose M here: the
 145           module will be called act_csum.
 146
 147 +config NET_ACT_CONNMARK
 148 +        tristate "Connection Tracking Marking"
 149 +        depends on NET_CLS_ACT
 150 +        depends on NF_CONNTRACK
 151 +        depends on NF_CONNTRACK_MARK
 152 +        ---help---
 153 +         Say Y here to restore the connmark from a scheduler action
 154 +
 155 +         If unsure, say N.
 156 +
 157 +         To compile this code as a module, choose M here: the
 158 +         module will be called act_connmark.
 159 +
 160  config NET_CLS_IND
 161         bool "Incoming device classification"
 162         depends on NET_CLS_U32 || NET_CLS_FW
 163 --- a/net/sched/Makefile
 164 +++ b/net/sched/Makefile
 165 @@ -16,6 +16,7 @@ obj-$(CONFIG_NET_ACT_PEDIT)   += act_pedit
 166  obj-$(CONFIG_NET_ACT_SIMP)     += act_simple.o
 167  obj-$(CONFIG_NET_ACT_SKBEDIT)  += act_skbedit.o
 168  obj-$(CONFIG_NET_ACT_CSUM)     += act_csum.o
 169 +obj-$(CONFIG_NET_ACT_CONNMARK) += act_connmark.o
 170  obj-$(CONFIG_NET_SCH_FIFO)     += sch_fifo.o
 171  obj-$(CONFIG_NET_SCH_CBQ)      += sch_cbq.o
 172  obj-$(CONFIG_NET_SCH_HTB)      += sch_htb.o