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ioam6: improve checks on user data

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This patch improves two checks on user data.

The first one prevents bit 23 from being set, as specified by RFC 9197
(Sec 4.4.1):

  Bit 23    Reserved; MUST be set to zero upon transmission and be
            ignored upon receipt.  This bit is reserved to allow for
            future extensions of the IOAM Trace-Type bit field.

The second one checks that the tunnel destination address !=
IPV6_ADDR_ANY, just like we already do for the tunnel source address.

Signed-off-by: Justin Iurman <justin.iurman@uliege.be>
Link: https://patch.msgid.link/20240830191919.51439-1-justin.iurman@uliege.be
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Justin Iurman 2024-08-30 21:19:19 +02:00 committed by Jakub Kicinski
parent 54f1a107bd
commit 1a5c486300
1 changed files with 10 additions and 2 deletions
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12
net/ipv6/ioam6_iptunnel.c
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@ -89,7 +89,7 @@ static bool ioam6_validate_trace_hdr(struct ioam6_trace_hdr *trace)
trace->type.bit12 | trace->type.bit13 | trace->type.bit14 |
trace->type.bit15 | trace->type.bit16 | trace->type.bit17 |
trace->type.bit18 | trace->type.bit19 | trace->type.bit20 |
trace->type.bit21)
trace->type.bit21 | trace->type.bit23)
return false;
trace->nodelen = 0;
@ -199,9 +199,17 @@ static int ioam6_build_state(struct net *net, struct nlattr *nla,
}
}
if (tb[IOAM6_IPTUNNEL_DST])
if (tb[IOAM6_IPTUNNEL_DST]) {
ilwt->tundst = nla_get_in6_addr(tb[IOAM6_IPTUNNEL_DST]);
if (ipv6_addr_any(&ilwt->tundst)) {
NL_SET_ERR_MSG_ATTR(extack, tb[IOAM6_IPTUNNEL_DST],
"invalid tunnel dest address");
err = -EINVAL;
goto free_cache;
}
}
tuninfo = ioam6_lwt_info(lwt);
tuninfo->eh.hdrlen = ((sizeof(*tuninfo) + len_aligned) >> 3) - 1;
tuninfo->pad[0] = IPV6_TLV_PADN;