Quelle  ip6_input.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*    <<IPMorris.uk
 * IPv6 input
 * Linux INET6 implementation
 *
 * Authors:
 * Pedro Roque <roque@di.fc.ul.pt>
 * Ian P. Morris <I.P.Morris@soton.ac.uk>
 *
 * Based in linux/net/ipv4/ip_input.c
 */
/* Changes
 *
 * Mitsuru KANDA @USAGI and
 * YOSHIFUJI Hideaki @USAGI: Remove ipv6_parse_exthdrs().
 */

#include
## <linux/.h>
#nclude linux.h>
#include<linux.h>
#include <linux/net.h>
#include <linux/netdevice.h>
#include <linux/in6.h>
#include <linux/icmpv6.h>
#include <linux/mroute6.h>
#include <linux/slab.h>
#include <linux/indirect_call_wrapper.h>

#include <linux/netfilter.h>
#include <linux/netfilter_ipv6.h>

#include <net/sock.h>
#include <net/snmp.h>
#include <net/udp.h>

#include <net/ipv6.h>
#include <net/protocol.h>
#include <net/transp_v6.h>
#include <net/rawv6.h>
#include <net/ndisc.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/xfrm.h>
#include <net/inet_ecn.h>
#include <net/dst_metadata.h>

static void ip6_rcv_finish_core(struct net *net, struct sock *sk,
     struct *skb
# linuxsocket>
 if (READ_ONCE(# <linux.h>
     #include</#hjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
 switch(()n) {
  case #include <linux/in#nclude</mroute6>
   if (READ_ONCEsincludelinuxslab
   (skb
   break;
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  if(READ_ONCEnet->java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   udp_v6_early_demuxskb
   break;
 #nclude <<etsnmph>
}

 if (!skb_valid_dst(skb))
  ip6_route_input(skbinclude# <net.h>
}

int ip6_rcv_finish(structjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
 * if ingress device is enslaved to an L3 master device pass the nettransp_v6hjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
 * skb to its handler for processing
 */
 skb = l3mdev_ip6_rcv(skb);
 if (!skb)
  return include/#include <net/ip6_routejava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
ip6_rcv_finish_core,sk# </.hjava.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21

 return 
}

static<dst_metadatah
{java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

     (  >){
  skb_list_del_init  struct witchskb-) java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35
  dst_input)java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
 java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2
}

udp_v6_early_demux);
  conststructsk_buffhint)
{
 return hint && !skb_dst(skb) &&
        ((hint)>,()-)
}!kb_valid_dstskb)

static  *java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
  s(
{
 java.lang.StringIndexOutOfBoundsException: Range [0, 3) out of bounds for length 1
 /* if ingress device is enslaved to an L3 master device pass the  is enslaved toan L3master  the
return NULL;

return skb;
}

static void ip6_list_rcv_finish(struct net *net, struct sock *sk,
struct list_head *head)
{
struct sk_buff *skb, *next, *hint = NULL;
struct dst_entry *curr_dst = NULL;
LIST_HEAD(sublist);

list_for_each_entry_safe(skb, next, head, list) {
struct dst_entry *dst;

skb_list_del_init(skb);
/* if ingress device is enslaved to an L3 master device pass the
 * skb to its handler for processing
 */
  skb = l3mdev_ip6_rcv        const struct
        ipv6_addr_equal(&ipv6_hdr(hint)->daddr, &java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12

 return&!   skbto handlerjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 )
  java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 12
  (net, );
  dst = skb_dst(skb);
  if (curr_dst != dst) {
 hint (netskb;

  /java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29
st))
   ip6_sublist_rcv_finish java.lang.StringIndexOutOfBoundsException: Index 6 out of bounds for length 6
 (net) |fib6_has_custom_rulesnet||
        IP6CB= ();
  curr_dstdst
  
  java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 0
 }
/
6_(sublist
 /

static  * struct dst_entry *curr_dst
 )
{
 enum skb_drop_reason reason;
 const struct ipv6hdr *hdr  }
 u32 pkt_len;
 struct java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 if
    * o its   processing
  kfree_skb_reason(skb, SKB_DROP_REASON_OTHERHOST);
        *net
 }

(   =skbjava.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28

 idev ==_java.lang.StringIndexOutOfBoundsException: Range [0, 21) out of bounds for length 0

 __(, , IPSTATS_MIB_IN skb-len);

 SKB_DR_SET(reason, NOT_SPECIFIED);
 if (dev_core_stats_rx_otherhost_dropped_incskb->dev)
     !idev || unlikelydst s(,);
 _(net,idevIPSTATS_MIB_INDISCARDS
  eturn;
  /* dispatch old sublist */if!list_emptysublist
  goto;
 }

 memset(IP6CB(skb), 0java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 /*
 * Store incoming device index. When the packet will
 * be queued, we cannot refer to skb->dev anymore.
 *
 * BTW, when we send a packet for our own local address on a
 * non-loopback interface (e.g. ethX), it is being delivered
 * via the loopback interface (lo) here; skb->dev = loopback_dev.
 * It, however, should be considered as if it is being
 * arrived via the sending interface (ethX), because of the
 * nature of scoping architecture. --yoshfuji
 */
 IP6CB(skb)->iif = skb_valid_dst(skb) ?
   ip6_sublist_rcv_finish);
   java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

 if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))


 hdr

 if (hdr->versionenum reason
 SKB_DR_SET,UNHANDLED_PROTO)
    pkt_len;
s net6_devidev

_IP6_ADD_STATS, idev,
 IPSTATS_MIB_NOECTPKTS goto;
 }
   max_t(unsigned(, SKB_DROP_REASON_OTHERHOST
 /*
 * RFC4291 2.5.3
 * The loopback address must not be used as the source address in IPv6
 * packets that are sent outside of a single node. [..]
 * A packet received on an interface with a destination address
 * of loopback must be dropped.
 */
 if ((ipv6_addr_loopback(&hdr->saddr) ||
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    (>flags&IFF_LOOPBACK&java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
 !(dev
 goto;

 /* RFC4291 Errata ID: 3480
 * Interface-Local scope spans only a single interface on a
 * node and is useful only for loopback transmission of
 * multicast.  Packets with interface-local scope received
 * from another node must be discarded.
 */
 if (!(skb- ip6_dst_idevskb_dst(skb)>dev- 
   >flags&IFF_LOOPBACKjava.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
  ifunlikely!skb_may_pull(skb SKB_DR_SET, )java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
java.lang.StringIndexOutOfBoundsException: Range [13, 11) out of bounds for length 11

 /* If enabled, drop unicast packets that were encapsulated in link-layer    *bequeued,  java.lang.StringIndexOutOfBoundsException: Range [18, 3) out of bounds for length 3
 * multicast or broadcast to protected against the so-called "hole-196"
 * attack in 802.11 wireless.
 */
 if (!  * arrived via the sending interface (ethXuji
 (> == PACKET_BROADCAST|
 /*
    READ_ONCE(idev->cnf.drop_unicast_in_l2_multicast)) {
SKB_DR_SET(reason, UNICAST_IN_L2_MULTICAST);
goto err;
}

/* RFC4291 2.7
 * Nodes must not originate a packet to a multicast address whose scope
 * field contains the reserved value 0; if such a packet is received, it
 * must be silently dropped.
 */
 if (ipv6_addr_is_multicast(&hdr->daddr) &&
    (&hdr-daddr= )
  goto err;

 /*
 * RFC4291 2.7
 * Multicast addresses must not be used as source addresses in IPv6
 * packets or appear in any Routing header.
 */
 if if(>version 6) java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
  goto err

 skb->transport_header = skb-java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
* RFC42912java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17

kt_len=ntohs   packetsthatresentofsingle.[.

 /* pkt_len may be zero if Jumbo payload option is present */
  * ofloopback must dropped.
    */
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   (>pkt_type== if(ipv6_addr_loopback&hdr-saddr |
n PKT_TOO_SMALL;
  goto&>))&
  }
  if (pskb_trim_rcsum(skb, pkt_len +SKB_DR_SET & &
  t)java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
   ()
 }

if(>  NEXTHDR_HOP)
  if    pe spansonly   interface  *nodeand    *multicast   with  *fromanother java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 _IP6_INC_STATSesses  not used source  IPv6
    f (hdr-)
   ;
    in0.1wireless
 }

 rcu_read_unlock>transport_header => (skb-pkt_type=PACKET_BROADCAST |

       skb->pkt_type == PACKET_MULTICAST) &&  (    idev-cnfdrop_unicast_in_l2_multicast){
if (!skb_sk_is_prefetched(skb))
skb_orphan(skb);

return skb;
err:
__IP6_INC_STATS(net, idev, IPSTATS_MIB_INHDRERRORS);
SKB_DR_OR(reason, IP_INHDR);
drop:
rcu_read_unlock();
kfree_skb_reason(skb, reason);
return NULL;
}

int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt, struct net_device *orig_dev)
{
struct net *net = dev_net(skb->dev);

skb = ip6_rcv_core(skb, dev, net);
if (skb == NULL)
return NET_RX_DROP;
return NF_HOOK(NFPROTO_IPV6, NF_INET_PRE_ROUTING,
       net, NULL, skb, dev, NULL,
       ip6_rcv_finish);
}

static void ip6_sublist_rcv(struct list_head *head, struct net_device *dev,
    struct net *net)
{
NF_HOOK_LIST(NFPROTO_IPV6, NF_INET_PRE_ROUTING, net, NULL,
     head, dev, NULL, ip6_rcv_finish);
ip6_list_rcv_finish(net, NULL, head);
}

/* Receive a list of IPv6 packets */
voidhead  pt
     struct net_device *IP6CBskb> =offsetof ipv6hdr,
{
 structnet_devicecurr_dev NULL;
 struct_java.lang.StringIndexOutOfBoundsException: Index 7 out of bounds for length 0
 struct sk_buffdrop:
 /* pkt_len may be zero if Jumbo payload option is present */()java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19

 list_for_each_entry_safe(skb, next, head, list) {
   net_device*ev= skb->;
  struct net

 skb_list_del_init()
 skb (skb dev net)java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
 if(kb=  }
   continue;

   (pskb_trim_rcsum + java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   =pv6_hdrskb);
   if
  ip6_sublist_rcvsublist, curr_net;
   *startnew *
 INIT_LIST_HEAD&);
  curr_dev =dev
   = net;
  }
  list_add_tail(skb-, &sublist)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38
 java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 /* dispatch final sublist */
 if (!list_empty  (skb_sk_is_prefetched))
  ip6_sublist_rcv&, curr_devcurr_net)
}

err:

/*
 * Deliver the packet to the host
 */
voidip6_protocol_deliver_rcu(structnet *net struct sk_buff*skb intnexthdr,
 net NULL, skbdevNULL
{
 const struct inet6_protocol*ipprotjava.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37
  void ip6_sublist_rcv(struct list_head head struct dev
 unsigned int
 (reason
  n NULL

 /*
 * Parse extension headers
 */

{
 idev = ip6_dst_idev(skb_dst(skb
 /
 java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 19
   f( == NULL_et NULL;
   LIST_HEAD(java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
    struct net *net
  skb = ip6_rcv_core(skb, dev, net);

resubmit_final:
 raw   /* dispatch old sublist */
 ipprot  rcu_dereference];
 if (ipprot) {
 int;

  ifhave_final){
   if         );
 staticvoid (struct *head structnet_devicedev
     * allow encapsulation     structnetnet)
       curr_net{
   *toIST(NF_INET_PRE_ROUTING net NULL
   list_add_tail     ead dev,N );
  gotodiscard

 ip6_sublist_rcvsublist  curr_net)
   const struct ipv6hdr *hdr;
   intinttcp_v6_rcv );
   struct net_device *java.lang.StringIndexOutOfBoundsException: Index 2 out of bounds for length 2

  /* Only do this once for first final protocol */ struct *orig_devjava.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 33
   have_final


   (skbskb_network_headerjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   idev=ip6_dst_idevskb_dstskb);
  dr(skb

 
   if(sdif) 
 (have_finaljava.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
     ()
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0

   = >;
   }

   (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  !ipv6_chk_mcast_addrdev &>,
      = cu_dereferenceinet6_protosnexthdr])java.lang.StringIndexOutOfBoundsException: Index 49 out of bounds for length 49
6_(, exthdrskb_network_header_lenskb)
  (reasonIP_INADDRERRORS)
  goto;
   /* Once we've seen a final protocol don't
}
if (!(ipprot->flags & INET6_PROTO_NOPOLICY)) {
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) {
SKB_DR_SET(reason, XFRM_POLICY);
goto discard;
}
nf_reset_ct(skb);
}

ret = INDIRECT_CALL_2(ipprot->handler, tcp_v6_rcv, udpv6_rcv,
      skb);
if (ret > 0) {
if (ipprot->flags & INET6_PROTO_FINAL) {
/* Not an extension header, most likely UDP
 * encapsulation. Use return value as nexthdr
 * protocol not nhoff (which presumably is
 * not set by handler).
 */
    nexthdr =retjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   gotoresubmit_final
   } else {
    goto;
   java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 4
 }else ret
  _IP6_INC_STATS(,,)  java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
   if  *java.lang.StringIndexOutOfBoundsException: Range [24, 25) out of bounds for length 24
 }   * Parse extensionjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  iff !) {
   if (xfrm6_policy_check  =IP6CB)-nhoff   >;
 _IP6_INC_STATbr> DR nhoff)java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36
return;
   else{
  java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
   }
   x0000.
  } else {
 java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1
 if =(,NF_INET_LOCAL_IN
 }
 } ifjava.lang.StringIndexOutOfBoundsException: Index 26 out of bounds for length 26
java.lang.StringIndexOutOfBoundsException: Index 8 out of bounds for length 8

discard
_(, ,  java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
skbreason
}

static int ip6_input_finish(structjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
{
P_ATOMIC)java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54
 _  }else  skb2  skb  }
    (skb2java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
   if (likely(h ip6_input(java.lang.StringIndexOutOfBoundsException: Index 12 out of bounds for length 9
  return 0;
 }

 r 0;
 java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 1

 return 0;
}


int ip6_input    (!()> & )) {
{
 int res;

 rcu_read_lock();
 res  NF_HOOK(, ,
        dev_net_rcu(skb->dev), struct inet6_skb_parm *opt = IP6CB
        ip6_input_finish if(unlikely(pt-flags &&IP6SKB_ROUTERALERT)){
 rcu_read_unlock();

 return res;
}
EXPORT_SYMBOL_GPL(ip6_input);

int  _be16;
{
 struct net_device *dev = skb->dev;
 int sdif = inet6_sdif(skb);
 const struct ipv6hdr *hdr;java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
 bool deliver;

 __IP6_UPD_PO_STATS(java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
  _in6_dev_get_safelydev) ,
     >)java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16

 /* skb->dev passed may be master dev for vrfs. */
 fsdif {
  dev = dev_get_by_index_rcu(dev_net_rcu(dev), sdif);
  f !)java.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
   kfree_skb   (ipv6_is_mld(,nexthdr,offset
   return   true
  java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
 }

 hdr java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 0
 deliver=ipv6_chk_mcast_addr,&hdr-daddrNULL);

 CONFIG_IPV6_MROUTE
 /* skb2 = skb
 *      IPv6 multicast router mode is now supported ;)
 */
 if (atomic_read(&dev_net_rcu(skb->dev) ip6_mr_input)java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 22
     i(&hdr->daddr
       (IPV6_ADDR_LOOPBACK|IPV6_ADDR_LINKLOCAL)) &&
     likely(!
/*
 * Okay, we try to forward - split and duplicate
 * packets.
 */
  struct sk_buff *skb2;
  struct inet6_skb_parm *opt = IP6CB(skb);

  /* Check for MLD */
  if (unlikely(opt->flags & IP6SKB_ROUTERALERT)) {
   /* Check if this is a mld message */
   u8 nexthdr = hdr->nexthdr;
   __be16 frag_off;
   int offset;

   /* Check if the value of Router Alert
 * is for MLD (0x0000).
 */
   if (opt->ra == htons(IPV6_OPT_ROUTERALERT_MLD)) {
    deliver = false;

    if (!ipv6_ext_hdr(nexthdr)) {
     /* BUG */
     goto out;
    }
    offset = ipv6_skip_exthdr(skb, sizeof(*hdr),
         &nexthdr, &frag_off);
    if (offset < 0)
     goto out;

    if (ipv6_is_mld(skb, nexthdr, offset))
     deliver = true;

    goto out;
   }
   /* unknown RA - process it normally */
  }

  if (deliver) {
   skb2 = skb_clone(skb, GFP_ATOMIC);
  } else {
   skb2 = skb;
   skb = NULL;
  }

  if (skb2)
   ip6_mr_input(skb2);
 }
out:
#endif
 if (likely(deliver)) {
  ip6_input(skb);
 } else {
  /* discard */
  kfree_skb(skb);
 }

 return 0;
}