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| author | Mathieu Xhonneux <m.xhonneux@gmail.com> | 2018-01-10 16:35:49 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-01-17 11:45:23 +0300 |
| commit | 0c21439334069b0cf8cac9f9115918b9b3a11287 (patch) | |
| tree | d79fa43ee87b30734fdf6d5aef94c10652f9e7e7 /net/ipv6/exthdrs.c | |
| parent | 71e7f85e10f189f4aa0162d6eea4a7163a48e3a6 (diff) | |
| download | linux-0c21439334069b0cf8cac9f9115918b9b3a11287.tar.xz | |
ipv6: sr: fix TLVs not being copied using setsockopt
[ Upstream commit ccc12b11c5332c84442ef120dcd631523be75089 ]
Function ipv6_push_rthdr4 allows to add an IPv6 Segment Routing Header
to a socket through setsockopt, but the current implementation doesn't
copy possible TLVs at the end of the SRH received from userspace.
Therefore, the execution of the following branch if (sr_has_hmac(sr_phdr))
{ ... } will never complete since the len and type fields of a possible
HMAC TLV are not copied, hence seg6_get_tlv_hmac will return an error,
and the HMAC will not be computed.
This commit adds a memcpy in case TLVs have been appended to the SRH.
Fixes: a149e7c7ce81 ("ipv6: sr: add support for SRH injection through setsockopt")
Acked-by: David Lebrun <dlebrun@google.com>
Signed-off-by: Mathieu Xhonneux <m.xhonneux@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/ipv6/exthdrs.c')
| -rw-r--r-- | net/ipv6/exthdrs.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c index 95516138e861..d6189c2a35e4 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -884,6 +884,15 @@ static void ipv6_push_rthdr4(struct sk_buff *skb, u8 *proto, sr_phdr->segments[0] = **addr_p; *addr_p = &sr_ihdr->segments[sr_ihdr->segments_left]; + if (sr_ihdr->hdrlen > hops * 2) { + int tlvs_offset, tlvs_length; + + tlvs_offset = (1 + hops * 2) << 3; + tlvs_length = (sr_ihdr->hdrlen - hops * 2) << 3; + memcpy((char *)sr_phdr + tlvs_offset, + (char *)sr_ihdr + tlvs_offset, tlvs_length); + } + #ifdef CONFIG_IPV6_SEG6_HMAC if (sr_has_hmac(sr_phdr)) { struct net *net = NULL; |