nvmet: don't return "any" ip address in discovery log page

Its perfectly valid to assign a nvmet port to listen on "any"
IP address (traddr 0.0.0.0 for ipv4 address family) for IP based
transport ports. However, we must not return this address in
discovery log entries. Instead we need to return the address
where the request was accepted on (req->port address).

Since this is nvme transport specific, introduce an optional
.disc_traddr interface that is designed to check that a
port in question is bound to "any" IP address and if so, set
the traddr from the port where the request came from.

Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

1 files changed, 27 insertions, 3 deletions

diff --git a/drivers/nvme/target/discovery.c b/drivers/nvme/target/discovery.c
index 8f3b57b4c97b..a72425d8bce0 100644
--- a/drivers/nvme/target/discovery.c
+++ b/drivers/nvme/target/discovery.c
@@ -43,7 +43,8 @@ void nvmet_referral_disable(struct nvmet_port *port)
 }
 
 static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
-		struct nvmet_port *port, char *subsys_nqn, u8 type, u32 numrec)
+		struct nvmet_port *port, char *subsys_nqn, char *traddr,
+		u8 type, u32 numrec)
 {
 	struct nvmf_disc_rsp_page_entry *e = &hdr->entries[numrec];
 
@@ -56,11 +57,30 @@ static void nvmet_format_discovery_entry(struct nvmf_disc_rsp_page_hdr *hdr,
 	e->asqsz = cpu_to_le16(NVME_AQ_DEPTH);
 	e->subtype = type;
 	memcpy(e->trsvcid, port->disc_addr.trsvcid, NVMF_TRSVCID_SIZE);
-	memcpy(e->traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
+	memcpy(e->traddr, traddr, NVMF_TRADDR_SIZE);
 	memcpy(e->tsas.common, port->disc_addr.tsas.common, NVMF_TSAS_SIZE);
 	memcpy(e->subnqn, subsys_nqn, NVMF_NQN_SIZE);
 }
 
+/*
+ * nvmet_set_disc_traddr - set a correct discovery log entry traddr
+ *
+ * IP based transports (e.g RDMA) can listen on "any" ipv4/ipv6 addresses
+ * (INADDR_ANY or IN6ADDR_ANY_INIT). The discovery log page traddr reply
+ * must not contain that "any" IP address. If the transport implements
+ * .disc_traddr, use it. this callback will set the discovery traddr
+ * from the req->port address in case the port in question listens
+ * "any" IP address.
+ */
+static void nvmet_set_disc_traddr(struct nvmet_req *req, struct nvmet_port *port,
+		char *traddr)
+{
+	if (req->ops->disc_traddr)
+		req->ops->disc_traddr(req, port, traddr);
+	else
+		memcpy(traddr, port->disc_addr.traddr, NVMF_TRADDR_SIZE);
+}
+
 static void nvmet_execute_get_disc_log_page(struct nvmet_req *req)
 {
 	const int entry_size = sizeof(struct nvmf_disc_rsp_page_entry);
@@ -90,8 +110,11 @@ static void nvmet_execute_get_disc_log_page(struct nvmet_req *req)
 		if (!nvmet_host_allowed(req, p->subsys, ctrl->hostnqn))
 			continue;
 		if (residual_len >= entry_size) {
+			char traddr[NVMF_TRADDR_SIZE];
+
+			nvmet_set_disc_traddr(req, req->port, traddr);
 			nvmet_format_discovery_entry(hdr, req->port,
-					p->subsys->subsysnqn,
+					p->subsys->subsysnqn, traddr,
 					NVME_NQN_NVME, numrec);
 			residual_len -= entry_size;
 		}
@@ -102,6 +125,7 @@ static void nvmet_execute_get_disc_log_page(struct nvmet_req *req)
 		if (residual_len >= entry_size) {
 			nvmet_format_discovery_entry(hdr, r,
 					NVME_DISC_SUBSYS_NAME,
+					r->disc_addr.traddr,
 					NVME_NQN_DISC, numrec);
 			residual_len -= entry_size;
 		}