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net/sched: act_pedit: check static offsets a priori

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Static key offsets should always be on 32 bit boundaries. Validate them on
create/update time for static offsets and move the datapath validation
for runtime offsets only.

iproute2 already errors out if a given offset and data size cannot be
packed to a 32 bit boundary. This change will make sure users which
create/update pedit instances directly via netlink also error out,
instead of finding out when packets are traversing.

Reviewed-by: Jamal Hadi Salim <jhs@mojatatu.com>
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Pedro Tammela <pctammela@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pedro Tammela 2023-04-21 18:25:15 -03:00 committed by David S. Miller
parent 0c83c5210e
commit e1201bc781
1 changed files with 14 additions and 6 deletions
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20
net/sched/act_pedit.c
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@ -251,8 +251,16 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
memcpy(nparms->tcfp_keys, parm->keys, ksize);
for (i = 0; i < nparms->tcfp_nkeys; ++i) {
u32 offmask = nparms->tcfp_keys[i].offmask;
u32 cur = nparms->tcfp_keys[i].off;
/* The AT option can be added to static offsets in the datapath */
if (!offmask && cur % 4) {
NL_SET_ERR_MSG_MOD(extack, "Offsets must be on 32bit boundaries");
ret = -EINVAL;
goto put_chain;
}
/* sanitize the shift value for any later use */
nparms->tcfp_keys[i].shift = min_t(size_t,
BITS_PER_TYPE(int) - 1,
@ -261,7 +269,7 @@ static int tcf_pedit_init(struct net *net, struct nlattr *nla,
/* The AT option can read a single byte, we can bound the actual
* value with uchar max.
*/
cur += (0xff & nparms->tcfp_keys[i].offmask) >> nparms->tcfp_keys[i].shift;
cur += (0xff & offmask) >> nparms->tcfp_keys[i].shift;
/* Each key touches 4 bytes starting from the computed offset */
nparms->tcfp_off_max_hint =
@ -411,12 +419,12 @@ TC_INDIRECT_SCOPE int tcf_pedit_act(struct sk_buff *skb,
sizeof(_d), &_d);
if (!d)
goto bad;
offset += (*d & tkey->offmask) >> tkey->shift;
}
if (offset % 4) {
pr_info("tc action pedit offset must be on 32 bit boundaries\n");
goto bad;
offset += (*d & tkey->offmask) >> tkey->shift;
if (offset % 4) {
pr_info("tc action pedit offset must be on 32 bit boundaries\n");
goto bad;
}
}
if (!offset_valid(skb, hoffset + offset)) {