[kernel] revert 15922 - add back 2.6.29 kernel support
[openwrt.git] / target / linux / generic-2.6 / patches-2.6.29 / 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 @@ -88,6 +88,9 @@ 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 @@ -147,13 +150,35 @@ 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 @@ -163,6 +188,8 @@ 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 @@ -210,7 +237,6 @@ unconditional(const struct ipt_ip *ip)
71                         return 0;
72  
73         return 1;
74 -#undef FWINV
75  }
76  
77  #if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
78 @@ -328,8 +354,27 @@ ipt_do_table(struct sk_buff *skb,
79         struct xt_match_param mtpar;
80         struct xt_target_param tgpar;
81  
82 -       /* Initialization */
83         ip = ip_hdr(skb);
84 +
85 +       read_lock_bh(&table->lock);
86 +       IP_NF_ASSERT(table->valid_hooks & (1 << hook));
87 +       private = table->private;
88 +       table_base = (void *)private->entries[smp_processor_id()];
89 +       e = get_entry(table_base, private->hook_entry[hook]);
90 +       if (e->target_offset <= sizeof(struct ipt_entry) &&
91 +               (e->ip.flags & IPT_F_NO_DEF_MATCH)) {
92 +                       struct ipt_entry_target *t = ipt_get_target(e);
93 +                       if (!t->u.kernel.target->target) {
94 +                               int v = ((struct ipt_standard_target *)t)->verdict;
95 +                               if ((v < 0) && (v != IPT_RETURN)) {
96 +                                       ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
97 +                                       read_unlock_bh(&table->lock);
98 +                                       return (unsigned)(-v) - 1;
99 +                               }
100 +                       }
101 +       }
102 +
103 +       /* Initialization */
104         datalen = skb->len - ip->ihl * 4;
105         indev = in ? in->name : nulldevname;
106         outdev = out ? out->name : nulldevname;
107 @@ -347,12 +392,6 @@ ipt_do_table(struct sk_buff *skb,
108         mtpar.family  = tgpar.family = NFPROTO_IPV4;
109         tgpar.hooknum = hook;
110  
111 -       read_lock_bh(&table->lock);
112 -       IP_NF_ASSERT(table->valid_hooks & (1 << hook));
113 -       private = table->private;
114 -       table_base = (void *)private->entries[smp_processor_id()];
115 -       e = get_entry(table_base, private->hook_entry[hook]);
116 -
117         /* For return from builtin chain */
118         back = get_entry(table_base, private->underflow[hook]);
119