Eric Lee / linux-smarc-t335x-v3.2

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Commit f630e43a215a3129d0c1173cae0bce6ea4855cf7

Authored by YOSHIFUJI Hideaki
Committed by David S. Miller
1 parent aea7427f70
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

ipv6: Drop packets for loopback address from outside of the box. 

[ Based upon original report and patch by Karsten Keil.  Karsten
  has verified that this fixes the TAHI test case "ICMPv6 test
  v6LC.5.1.2 Part F". -DaveM ]

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Showing 2 changed files with 15 additions and 0 deletions Side-by-side Diff

... ... @@ -367,6 +367,12 @@
367 367 a->s6_addr32[2] | a->s6_addr32[3] ) == 0);
368 368 }
369 369  
  370 +static inline int ipv6_addr_loopback(const struct in6_addr *a)
  371 +{
  372 + return ((a->s6_addr32[0] | a->s6_addr32[1] |
  373 + a->s6_addr32[2] | (a->s6_addr32[3] ^ htonl(1))) == 0);
  374 +}
  375 +
370 376 static inline int ipv6_addr_v4mapped(const struct in6_addr *a)
371 377 {
372 378 return ((a->s6_addr32[0] | a->s6_addr32[1] |
net/ipv6/ip6_input.c
Diff comments   View file @ f630e43
... ... @@ -102,6 +102,15 @@
102 102 if (hdr->version != 6)
103 103 goto err;
104 104  
  105 + /*
  106 + * RFC4291 2.5.3
  107 + * A packet received on an interface with a destination address
  108 + * of loopback must be dropped.
  109 + */
  110 + if (!(dev->flags & IFF_LOOPBACK) &&
  111 + ipv6_addr_loopback(&hdr->daddr))
  112 + goto err;
  113 +
105 114 skb->transport_header = skb->network_header + sizeof(*hdr);
106 115 IP6CB(skb)->nhoff = offsetof(struct ipv6hdr, nexthdr);
107 116