~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/net/bridge/netfilter/ebt_ip6.c

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /*
  2  *  ebt_ip6
  3  *
  4  *      Authors:
  5  *      Manohar Castelino <manohar.r.castelino@intel.com>
  6  *      Kuo-Lang Tseng <kuo-lang.tseng@intel.com>
  7  *      Jan Engelhardt <jengelh@medozas.de>
  8  *
  9  * Summary:
 10  * This is just a modification of the IPv4 code written by
 11  * Bart De Schuymer <bdschuym@pandora.be>
 12  * with the changes required to support IPv6
 13  *
 14  *  Jan, 2008
 15  */
 16 #include <linux/ipv6.h>
 17 #include <net/ipv6.h>
 18 #include <linux/in.h>
 19 #include <linux/module.h>
 20 #include <net/dsfield.h>
 21 #include <linux/netfilter/x_tables.h>
 22 #include <linux/netfilter_bridge/ebtables.h>
 23 #include <linux/netfilter_bridge/ebt_ip6.h>
 24 
 25 union pkthdr {
 26         struct {
 27                 __be16 src;
 28                 __be16 dst;
 29         } tcpudphdr;
 30         struct {
 31                 u8 type;
 32                 u8 code;
 33         } icmphdr;
 34 };
 35 
 36 static bool
 37 ebt_ip6_mt(const struct sk_buff *skb, struct xt_action_param *par)
 38 {
 39         const struct ebt_ip6_info *info = par->matchinfo;
 40         const struct ipv6hdr *ih6;
 41         struct ipv6hdr _ip6h;
 42         const union pkthdr *pptr;
 43         union pkthdr _pkthdr;
 44 
 45         ih6 = skb_header_pointer(skb, 0, sizeof(_ip6h), &_ip6h);
 46         if (ih6 == NULL)
 47                 return false;
 48         if (info->bitmask & EBT_IP6_TCLASS &&
 49            FWINV(info->tclass != ipv6_get_dsfield(ih6), EBT_IP6_TCLASS))
 50                 return false;
 51         if ((info->bitmask & EBT_IP6_SOURCE &&
 52             FWINV(ipv6_masked_addr_cmp(&ih6->saddr, &info->smsk,
 53                                        &info->saddr), EBT_IP6_SOURCE)) ||
 54             (info->bitmask & EBT_IP6_DEST &&
 55             FWINV(ipv6_masked_addr_cmp(&ih6->daddr, &info->dmsk,
 56                                        &info->daddr), EBT_IP6_DEST)))
 57                 return false;
 58         if (info->bitmask & EBT_IP6_PROTO) {
 59                 uint8_t nexthdr = ih6->nexthdr;
 60                 __be16 frag_off;
 61                 int offset_ph;
 62 
 63                 offset_ph = ipv6_skip_exthdr(skb, sizeof(_ip6h), &nexthdr, &frag_off);
 64                 if (offset_ph == -1)
 65                         return false;
 66                 if (FWINV(info->protocol != nexthdr, EBT_IP6_PROTO))
 67                         return false;
 68                 if (!(info->bitmask & (EBT_IP6_DPORT |
 69                                        EBT_IP6_SPORT | EBT_IP6_ICMP6)))
 70                         return true;
 71 
 72                 /* min icmpv6 headersize is 4, so sizeof(_pkthdr) is ok. */
 73                 pptr = skb_header_pointer(skb, offset_ph, sizeof(_pkthdr),
 74                                           &_pkthdr);
 75                 if (pptr == NULL)
 76                         return false;
 77                 if (info->bitmask & EBT_IP6_DPORT) {
 78                         u16 dst = ntohs(pptr->tcpudphdr.dst);
 79                         if (FWINV(dst < info->dport[0] ||
 80                                   dst > info->dport[1], EBT_IP6_DPORT))
 81                                 return false;
 82                 }
 83                 if (info->bitmask & EBT_IP6_SPORT) {
 84                         u16 src = ntohs(pptr->tcpudphdr.src);
 85                         if (FWINV(src < info->sport[0] ||
 86                                   src > info->sport[1], EBT_IP6_SPORT))
 87                         return false;
 88                 }
 89                 if ((info->bitmask & EBT_IP6_ICMP6) &&
 90                      FWINV(pptr->icmphdr.type < info->icmpv6_type[0] ||
 91                            pptr->icmphdr.type > info->icmpv6_type[1] ||
 92                            pptr->icmphdr.code < info->icmpv6_code[0] ||
 93                            pptr->icmphdr.code > info->icmpv6_code[1],
 94                                                         EBT_IP6_ICMP6))
 95                         return false;
 96         }
 97         return true;
 98 }
 99 
100 static int ebt_ip6_mt_check(const struct xt_mtchk_param *par)
101 {
102         const struct ebt_entry *e = par->entryinfo;
103         struct ebt_ip6_info *info = par->matchinfo;
104 
105         if (e->ethproto != htons(ETH_P_IPV6) || e->invflags & EBT_IPROTO)
106                 return -EINVAL;
107         if (info->bitmask & ~EBT_IP6_MASK || info->invflags & ~EBT_IP6_MASK)
108                 return -EINVAL;
109         if (info->bitmask & (EBT_IP6_DPORT | EBT_IP6_SPORT)) {
110                 if (info->invflags & EBT_IP6_PROTO)
111                         return -EINVAL;
112                 if (info->protocol != IPPROTO_TCP &&
113                     info->protocol != IPPROTO_UDP &&
114                     info->protocol != IPPROTO_UDPLITE &&
115                     info->protocol != IPPROTO_SCTP &&
116                     info->protocol != IPPROTO_DCCP)
117                         return -EINVAL;
118         }
119         if (info->bitmask & EBT_IP6_DPORT && info->dport[0] > info->dport[1])
120                 return -EINVAL;
121         if (info->bitmask & EBT_IP6_SPORT && info->sport[0] > info->sport[1])
122                 return -EINVAL;
123         if (info->bitmask & EBT_IP6_ICMP6) {
124                 if ((info->invflags & EBT_IP6_PROTO) ||
125                      info->protocol != IPPROTO_ICMPV6)
126                         return -EINVAL;
127                 if (info->icmpv6_type[0] > info->icmpv6_type[1] ||
128                     info->icmpv6_code[0] > info->icmpv6_code[1])
129                         return -EINVAL;
130         }
131         return 0;
132 }
133 
134 static struct xt_match ebt_ip6_mt_reg __read_mostly = {
135         .name           = "ip6",
136         .revision       = 0,
137         .family         = NFPROTO_BRIDGE,
138         .match          = ebt_ip6_mt,
139         .checkentry     = ebt_ip6_mt_check,
140         .matchsize      = sizeof(struct ebt_ip6_info),
141         .me             = THIS_MODULE,
142 };
143 
144 static int __init ebt_ip6_init(void)
145 {
146         return xt_register_match(&ebt_ip6_mt_reg);
147 }
148 
149 static void __exit ebt_ip6_fini(void)
150 {
151         xt_unregister_match(&ebt_ip6_mt_reg);
152 }
153 
154 module_init(ebt_ip6_init);
155 module_exit(ebt_ip6_fini);
156 MODULE_DESCRIPTION("Ebtables: IPv6 protocol packet match");
157 MODULE_AUTHOR("Kuo-Lang Tseng <kuo-lang.tseng@intel.com>");
158 MODULE_LICENSE("GPL");
159 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp