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Linux/net/ipv6/netfilter/nf_socket_ipv6.c

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  1 /*
  2  * Copyright (C) 2007-2008 BalaBit IT Ltd.
  3  * Author: Krisztian Kovacs
  4  *
  5  * This program is free software; you can redistribute it and/or modify
  6  * it under the terms of the GNU General Public License version 2 as
  7  * published by the Free Software Foundation.
  8  *
  9  */
 10 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 11 #include <linux/module.h>
 12 #include <linux/skbuff.h>
 13 #include <net/tcp.h>
 14 #include <net/udp.h>
 15 #include <net/icmp.h>
 16 #include <net/sock.h>
 17 #include <net/inet_sock.h>
 18 #include <net/inet6_hashtables.h>
 19 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 20 #include <net/netfilter/nf_socket.h>
 21 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 22 #include <net/netfilter/nf_conntrack.h>
 23 #endif
 24 
 25 static int
 26 extract_icmp6_fields(const struct sk_buff *skb,
 27                      unsigned int outside_hdrlen,
 28                      int *protocol,
 29                      const struct in6_addr **raddr,
 30                      const struct in6_addr **laddr,
 31                      __be16 *rport,
 32                      __be16 *lport,
 33                      struct ipv6hdr *ipv6_var)
 34 {
 35         const struct ipv6hdr *inside_iph;
 36         struct icmp6hdr *icmph, _icmph;
 37         __be16 *ports, _ports[2];
 38         u8 inside_nexthdr;
 39         __be16 inside_fragoff;
 40         int inside_hdrlen;
 41 
 42         icmph = skb_header_pointer(skb, outside_hdrlen,
 43                                    sizeof(_icmph), &_icmph);
 44         if (icmph == NULL)
 45                 return 1;
 46 
 47         if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
 48                 return 1;
 49 
 50         inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
 51                                         sizeof(*ipv6_var), ipv6_var);
 52         if (inside_iph == NULL)
 53                 return 1;
 54         inside_nexthdr = inside_iph->nexthdr;
 55 
 56         inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
 57                                               sizeof(*ipv6_var),
 58                                          &inside_nexthdr, &inside_fragoff);
 59         if (inside_hdrlen < 0)
 60                 return 1; /* hjm: Packet has no/incomplete transport layer headers. */
 61 
 62         if (inside_nexthdr != IPPROTO_TCP &&
 63             inside_nexthdr != IPPROTO_UDP)
 64                 return 1;
 65 
 66         ports = skb_header_pointer(skb, inside_hdrlen,
 67                                    sizeof(_ports), &_ports);
 68         if (ports == NULL)
 69                 return 1;
 70 
 71         /* the inside IP packet is the one quoted from our side, thus
 72          * its saddr is the local address */
 73         *protocol = inside_nexthdr;
 74         *laddr = &inside_iph->saddr;
 75         *lport = ports[0];
 76         *raddr = &inside_iph->daddr;
 77         *rport = ports[1];
 78 
 79         return 0;
 80 }
 81 
 82 static struct sock *
 83 nf_socket_get_sock_v6(struct net *net, struct sk_buff *skb, int doff,
 84                       const u8 protocol,
 85                       const struct in6_addr *saddr, const struct in6_addr *daddr,
 86                       const __be16 sport, const __be16 dport,
 87                       const struct net_device *in)
 88 {
 89         switch (protocol) {
 90         case IPPROTO_TCP:
 91                 return inet6_lookup(net, &tcp_hashinfo, skb, doff,
 92                                     saddr, sport, daddr, dport,
 93                                     in->ifindex);
 94         case IPPROTO_UDP:
 95                 return udp6_lib_lookup(net, saddr, sport, daddr, dport,
 96                                        in->ifindex);
 97         }
 98 
 99         return NULL;
100 }
101 
102 struct sock *nf_sk_lookup_slow_v6(struct net *net, const struct sk_buff *skb,
103                                   const struct net_device *indev)
104 {
105         __be16 uninitialized_var(dport), uninitialized_var(sport);
106         const struct in6_addr *daddr = NULL, *saddr = NULL;
107         struct ipv6hdr *iph = ipv6_hdr(skb);
108         struct sk_buff *data_skb = NULL;
109         int doff = 0;
110         int thoff = 0, tproto;
111 
112         tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
113         if (tproto < 0) {
114                 pr_debug("unable to find transport header in IPv6 packet, dropping\n");
115                 return NULL;
116         }
117 
118         if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
119                 struct udphdr _hdr, *hp;
120 
121                 hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
122                 if (hp == NULL)
123                         return NULL;
124 
125                 saddr = &iph->saddr;
126                 sport = hp->source;
127                 daddr = &iph->daddr;
128                 dport = hp->dest;
129                 data_skb = (struct sk_buff *)skb;
130                 doff = tproto == IPPROTO_TCP ?
131                         thoff + __tcp_hdrlen((struct tcphdr *)hp) :
132                         thoff + sizeof(*hp);
133 
134         } else if (tproto == IPPROTO_ICMPV6) {
135                 struct ipv6hdr ipv6_var;
136 
137                 if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
138                                          &sport, &dport, &ipv6_var))
139                         return NULL;
140         } else {
141                 return NULL;
142         }
143 
144         return nf_socket_get_sock_v6(net, data_skb, doff, tproto, saddr, daddr,
145                                      sport, dport, indev);
146 }
147 EXPORT_SYMBOL_GPL(nf_sk_lookup_slow_v6);
148 
149 MODULE_LICENSE("GPL");
150 MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler");
151 MODULE_DESCRIPTION("Netfilter IPv6 socket lookup infrastructure");
152 

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