target/linux/generic-2.6/patches-2.6.35/110-netfilter_match_speedup.patch

   1 --- a/include/linux/netfilter_ipv4/ip_tables.h
   2 +++ b/include/linux/netfilter_ipv4/ip_tables.h
   3 @@ -62,6 +62,7 @@ struct ipt_ip {
   4  #define IPT_F_FRAG             0x01    /* Set if rule is a fragment rule */
   5  #define IPT_F_GOTO             0x02    /* Set if jump is a goto */
   6  #define IPT_F_MASK             0x03    /* All possible flag bits mask. */
   7 +#define IPT_F_NO_DEF_MATCH     0x80    /* Internal: no default match rules present */
   8
   9  /* Values for "inv" field in struct ipt_ip. */
  10  #define IPT_INV_VIA_IN         0x01    /* Invert the sense of IN IFACE. */
  11 --- a/net/ipv4/netfilter/ip_tables.c
  12 +++ b/net/ipv4/netfilter/ip_tables.c
  13 @@ -90,6 +90,9 @@ ip_packet_match(const struct iphdr *ip,
  14
  15  #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
  16
  17 +       if (ipinfo->flags & IPT_F_NO_DEF_MATCH)
  18 +               return true;
  19 +
  20         if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
  21                   IPT_INV_SRCIP) ||
  22             FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
  23 @@ -140,13 +143,35 @@ ip_packet_match(const struct iphdr *ip,
  24                 return false;
  25         }
  26
  27 +#undef FWINV
  28         return true;
  29  }
  30
  31  static bool
  32 -ip_checkentry(const struct ipt_ip *ip)
  33 +ip_checkentry(struct ipt_ip *ip)
  34  {
  35 -       if (ip->flags & ~IPT_F_MASK) {
  36 +#define FWINV(bool, invflg) ((bool) || (ip->invflags & (invflg)))
  37 +
  38 +       if (FWINV(ip->smsk.s_addr, IPT_INV_SRCIP) ||
  39 +               FWINV(ip->dmsk.s_addr, IPT_INV_DSTIP))
  40 +               goto has_match_rules;
  41 +
  42 +       if (FWINV(!!((const unsigned long *)ip->iniface_mask)[0],
  43 +               IPT_INV_VIA_IN) ||
  44 +           FWINV(!!((const unsigned long *)ip->outiface_mask)[0],
  45 +               IPT_INV_VIA_OUT))
  46 +               goto has_match_rules;
  47 +
  48 +       if (FWINV(ip->proto, IPT_INV_PROTO))
  49 +               goto has_match_rules;
  50 +
  51 +       if (FWINV(ip->flags&IPT_F_FRAG, IPT_INV_FRAG))
  52 +               goto has_match_rules;
  53 +
  54 +       ip->flags |= IPT_F_NO_DEF_MATCH;
  55 +
  56 +has_match_rules:
  57 +       if (ip->flags & ~(IPT_F_MASK|IPT_F_NO_DEF_MATCH)) {
  58                 duprintf("Unknown flag bits set: %08X\n",
  59                          ip->flags & ~IPT_F_MASK);
  60                 return false;
  61 @@ -156,6 +181,8 @@ ip_checkentry(const struct ipt_ip *ip)
  62                          ip->invflags & ~IPT_INV_MASK);
  63                 return false;
  64         }
  65 +
  66 +#undef FWINV
  67         return true;
  68  }
  69
  70 @@ -182,7 +209,6 @@ static inline bool unconditional(const s
  71         static const struct ipt_ip uncond;
  72
  73         return memcmp(ip, &uncond, sizeof(uncond)) == 0;
  74 -#undef FWINV
  75  }
  76
  77  /* for const-correctness */
  78 @@ -312,8 +338,28 @@ ipt_do_table(struct sk_buff *skb,
  79         const struct xt_table_info *private;
  80         struct xt_action_param acpar;
  81
  82 -       /* Initialization */
  83         ip = ip_hdr(skb);
  84 +
  85 +       IP_NF_ASSERT(table->valid_hooks & (1 << hook));
  86 +       xt_info_rdlock_bh();
  87 +       private = table->private;
  88 +       table_base = private->entries[smp_processor_id()];
  89 +       e = get_entry(table_base, private->hook_entry[hook]);
  90 +
  91 +       if (e->target_offset <= sizeof(struct ipt_entry) &&
  92 +               (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
  93 +                       struct ipt_entry_target *t = ipt_get_target(e);
  94 +                       if (!t->u.kernel.target->target) {
  95 +                               int v = ((struct ipt_standard_target *)t)->verdict;
  96 +                               if ((v < 0) && (v != IPT_RETURN)) {
  97 +                                       ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
  98 +                                       xt_info_rdunlock_bh();
  99 +                                       return (unsigned)(-v) - 1;
 100 +                               }
 101 +                       }
 102 +       }
 103 +
 104 +       /* Initialization */
 105         indev = in ? in->name : nulldevname;
 106         outdev = out ? out->name : nulldevname;
 107         /* We handle fragments by dealing with the first fragment as
 108 @@ -970,6 +1016,7 @@ copy_entries_to_user(unsigned int total_
 109                 unsigned int i;
 110                 const struct ipt_entry_match *m;
 111                 const struct ipt_entry_target *t;
 112 +               u8 flags;
 113
 114                 e = (struct ipt_entry *)(loc_cpu_entry + off);
 115                 if (copy_to_user(userptr + off
 116 @@ -979,6 +1026,14 @@ copy_entries_to_user(unsigned int total_
 117                         ret = -EFAULT;
 118                         goto free_counters;
 119                 }
 120 +
 121 +               flags = e->ip.flags & ~IPT_F_NO_DEF_MATCH;
 122 +               if (copy_to_user(userptr + off
 123 +                                + offsetof(struct ipt_entry, ip.flags),
 124 +                                &flags, sizeof(flags)) != 0) {
 125 +                       ret = -EFAULT;
 126 +                       goto free_counters;
 127 +               }
 128
 129                 for (i = sizeof(struct ipt_entry);
 130                      i < e->target_offset;