From 16526538051e87098467af09278a8e8aca36843a Mon Sep 17 00:00:00 2001 From: Taehee Yoo Date: Sun, 17 Jul 2022 16:09:08 +0000 Subject: [PATCH] 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: 19284cc854b3 ("amt: add data plane of amt interface") Signed-off-by: Taehee Yoo Signed-off-by: Paolo Abeni --- drivers/net/amt.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/net/amt.c b/drivers/net/amt.c index 2d007c5c54636..8dc7b8f258c89 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; -- 2.39.5