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| author | Taehee Yoo <ap420073@gmail.com> | 2022-07-17 19:09:08 +0300 |
|---|---|---|
| committer | Paolo Abeni <pabeni@redhat.com> | 2022-07-19 13:37:02 +0300 |
| commit | 239d886601e38d948a28f3b2a1c9ce5f01bf75f2 (patch) | |
| tree | e03650ce70b4b7af7b4ad2d148bed15edeafedda /drivers/net/amt.c | |
| parent | 40185f359fbabaa61da754cc29d12f3a41e0a987 (diff) | |
| download | linux-239d886601e38d948a28f3b2a1c9ce5f01bf75f2.tar.xz | |
amt: drop unexpected query message
AMT gateway interface should not receive unexpected query messages.
In order to drop unexpected query messages, it checks nonce.
And it also checks ready4 and ready6 variables to drop duplicated messages.
Fixes: cbc21dc1cfe9 ("amt: add data plane of amt interface")
Signed-off-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Diffstat (limited to 'drivers/net/amt.c')
| -rw-r--r-- | drivers/net/amt.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/net/amt.c b/drivers/net/amt.c index 2d007c5c5463..8dc7b8f258c8 100644 --- a/drivers/net/amt.c +++ b/drivers/net/amt.c @@ -967,8 +967,11 @@ static void amt_event_send_request(struct amt_dev *amt) goto out; } - if (!amt->req_cnt) + if (!amt->req_cnt) { + WRITE_ONCE(amt->ready4, false); + WRITE_ONCE(amt->ready6, false); get_random_bytes(&amt->nonce, sizeof(__be32)); + } amt_send_request(amt, false); amt_send_request(amt, true); @@ -2353,6 +2356,9 @@ static bool amt_membership_query_handler(struct amt_dev *amt, if (amtmq->reserved || amtmq->version) return true; + if (amtmq->nonce != amt->nonce) + return true; + hdr_size -= sizeof(*eth); if (iptunnel_pull_header(skb, hdr_size, htons(ETH_P_TEB), false)) return true; @@ -2367,6 +2373,9 @@ static bool amt_membership_query_handler(struct amt_dev *amt, iph = ip_hdr(skb); if (iph->version == 4) { + if (READ_ONCE(amt->ready4)) + return true; + if (!pskb_may_pull(skb, sizeof(*iph) + AMT_IPHDR_OPTS + sizeof(*ihv3))) return true; @@ -2389,6 +2398,9 @@ static bool amt_membership_query_handler(struct amt_dev *amt, struct mld2_query *mld2q; struct ipv6hdr *ip6h; + if (READ_ONCE(amt->ready6)) + return true; + if (!pskb_may_pull(skb, sizeof(*ip6h) + AMT_IP6HDR_OPTS + sizeof(*mld2q))) return true; |