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authorJonathan T. Leighton <jtleight@udel.edu>2017-02-12 17:26:07 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-14 12:13:51 -0500
commit052d2369d1b479cdbbe020fdd6d057d3c342db74 (patch)
tree16f83a2393edec2827eac68eac1d1e739dcb862f /net/ipv6/udp.c
parentec5e3b0a1d41fbda0cc33a45bc9e54e91d9d12c7 (diff)
ipv6: Handle IPv4-mapped src to in6addr_any dst.
This patch adds a check on the type of the source address for the case where the destination address is in6addr_any. If the source is an IPv4-mapped IPv6 source address, the destination is changed to ::ffff:127.0.0.1, and otherwise the destination is changed to ::1. This is done in three locations to handle UDP calls to either connect() or sendmsg() and TCP calls to connect(). Note that udpv6_sendmsg() delays handling an in6addr_any destination until very late, so the patch only needs to handle the case where the source is an IPv4-mapped IPv6 address. Signed-off-by: Jonathan T. Leighton <jtleight@udel.edu> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/udp.c')
-rw-r--r--net/ipv6/udp.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 8990856f5101..221825a9407a 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -1033,6 +1033,10 @@ int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
if (addr_len < SIN6_LEN_RFC2133)
return -EINVAL;
daddr = &sin6->sin6_addr;
+ if (ipv6_addr_any(daddr) &&
+ ipv6_addr_v4mapped(&np->saddr))
+ ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK),
+ daddr);
break;
case AF_INET:
goto do_udp_sendmsg;