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Linux/net/ipv6/netfilter/nf_socket_ipv6.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) 2007-2008 BalaBit IT Ltd.
  4  * Author: Krisztian Kovacs
  5  */
  6 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  7 #include <linux/module.h>
  8 #include <linux/skbuff.h>
  9 #include <net/tcp.h>
 10 #include <net/udp.h>
 11 #include <net/icmp.h>
 12 #include <net/sock.h>
 13 #include <net/inet_sock.h>
 14 #include <net/inet6_hashtables.h>
 15 #include <net/netfilter/nf_socket.h>
 16 #if IS_ENABLED(CONFIG_NF_CONNTRACK)
 17 #include <net/netfilter/nf_conntrack.h>
 18 #endif
 19 
 20 static int
 21 extract_icmp6_fields(const struct sk_buff *skb,
 22                      unsigned int outside_hdrlen,
 23                      int *protocol,
 24                      const struct in6_addr **raddr,
 25                      const struct in6_addr **laddr,
 26                      __be16 *rport,
 27                      __be16 *lport,
 28                      struct ipv6hdr *ipv6_var)
 29 {
 30         const struct ipv6hdr *inside_iph;
 31         struct icmp6hdr *icmph, _icmph;
 32         __be16 *ports, _ports[2];
 33         u8 inside_nexthdr;
 34         __be16 inside_fragoff;
 35         int inside_hdrlen;
 36 
 37         icmph = skb_header_pointer(skb, outside_hdrlen,
 38                                    sizeof(_icmph), &_icmph);
 39         if (icmph == NULL)
 40                 return 1;
 41 
 42         if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
 43                 return 1;
 44 
 45         inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
 46                                         sizeof(*ipv6_var), ipv6_var);
 47         if (inside_iph == NULL)
 48                 return 1;
 49         inside_nexthdr = inside_iph->nexthdr;
 50 
 51         inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
 52                                               sizeof(*ipv6_var),
 53                                          &inside_nexthdr, &inside_fragoff);
 54         if (inside_hdrlen < 0)
 55                 return 1; /* hjm: Packet has no/incomplete transport layer headers. */
 56 
 57         if (inside_nexthdr != IPPROTO_TCP &&
 58             inside_nexthdr != IPPROTO_UDP)
 59                 return 1;
 60 
 61         ports = skb_header_pointer(skb, inside_hdrlen,
 62                                    sizeof(_ports), &_ports);
 63         if (ports == NULL)
 64                 return 1;
 65 
 66         /* the inside IP packet is the one quoted from our side, thus
 67          * its saddr is the local address */
 68         *protocol = inside_nexthdr;
 69         *laddr = &inside_iph->saddr;
 70         *lport = ports[0];
 71         *raddr = &inside_iph->daddr;
 72         *rport = ports[1];
 73 
 74         return 0;
 75 }
 76 
 77 static struct sock *
 78 nf_socket_get_sock_v6(struct net *net, struct sk_buff *skb, int doff,
 79                       const u8 protocol,
 80                       const struct in6_addr *saddr, const struct in6_addr *daddr,
 81                       const __be16 sport, const __be16 dport,
 82                       const struct net_device *in)
 83 {
 84         switch (protocol) {
 85         case IPPROTO_TCP:
 86                 return inet6_lookup(net, &tcp_hashinfo, skb, doff,
 87                                     saddr, sport, daddr, dport,
 88                                     in->ifindex);
 89         case IPPROTO_UDP:
 90                 return udp6_lib_lookup(net, saddr, sport, daddr, dport,
 91                                        in->ifindex);
 92         }
 93 
 94         return NULL;
 95 }
 96 
 97 struct sock *nf_sk_lookup_slow_v6(struct net *net, const struct sk_buff *skb,
 98                                   const struct net_device *indev)
 99 {
100         __be16 dport, sport;
101         const struct in6_addr *daddr = NULL, *saddr = NULL;
102         struct ipv6hdr *iph = ipv6_hdr(skb);
103         struct sk_buff *data_skb = NULL;
104         int doff = 0;
105         int thoff = 0, tproto;
106 
107         tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
108         if (tproto < 0) {
109                 pr_debug("unable to find transport header in IPv6 packet, dropping\n");
110                 return NULL;
111         }
112 
113         if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
114                 struct tcphdr _hdr;
115                 struct udphdr *hp;
116 
117                 hp = skb_header_pointer(skb, thoff, tproto == IPPROTO_UDP ?
118                                         sizeof(*hp) : sizeof(_hdr), &_hdr);
119                 if (hp == NULL)
120                         return NULL;
121 
122                 saddr = &iph->saddr;
123                 sport = hp->source;
124                 daddr = &iph->daddr;
125                 dport = hp->dest;
126                 data_skb = (struct sk_buff *)skb;
127                 doff = tproto == IPPROTO_TCP ?
128                         thoff + __tcp_hdrlen((struct tcphdr *)hp) :
129                         thoff + sizeof(*hp);
130 
131         } else if (tproto == IPPROTO_ICMPV6) {
132                 struct ipv6hdr ipv6_var;
133 
134                 if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
135                                          &sport, &dport, &ipv6_var))
136                         return NULL;
137         } else {
138                 return NULL;
139         }
140 
141         return nf_socket_get_sock_v6(net, data_skb, doff, tproto, saddr, daddr,
142                                      sport, dport, indev);
143 }
144 EXPORT_SYMBOL_GPL(nf_sk_lookup_slow_v6);
145 
146 MODULE_LICENSE("GPL");
147 MODULE_AUTHOR("Krisztian Kovacs, Balazs Scheidler");
148 MODULE_DESCRIPTION("Netfilter IPv6 socket lookup infrastructure");
149 

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