diff options
| author | Avinash Repaka <avinash.repaka@oracle.com> | 2016-02-29 15:30:57 -0800 |
|---|---|---|
| committer | Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2017-01-02 14:02:57 -0800 |
| commit | f9fb69adb6c7acca60977a4db5a5f95b8e66c041 (patch) | |
| tree | dff2d16511069d9fb5961ba6284ae3aa56520fa1 /net/rds/send.c | |
| parent | 192a798f52998a643cef84fce0204be56666b0bf (diff) | |
| download | linux-f9fb69adb6c7acca60977a4db5a5f95b8e66c041.tar.gz linux-f9fb69adb6c7acca60977a4db5a5f95b8e66c041.tar.bz2 linux-f9fb69adb6c7acca60977a4db5a5f95b8e66c041.zip | |
RDS: make message size limit compliant with spec
RDS support max message size as 1M but the code doesn't check this
in all cases. Patch fixes it for RDMA & non-RDMA and RDS MR size
and its enforced irrespective of underlying transport.
Signed-off-by: Avinash Repaka <avinash.repaka@oracle.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Diffstat (limited to 'net/rds/send.c')
| -rw-r--r-- | net/rds/send.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/net/rds/send.c b/net/rds/send.c index 45e025b65d29..5cc64039caf7 100644 --- a/net/rds/send.c +++ b/net/rds/send.c @@ -994,6 +994,26 @@ static int rds_send_mprds_hash(struct rds_sock *rs, struct rds_connection *conn) return hash; } +static int rds_rdma_bytes(struct msghdr *msg, size_t *rdma_bytes) +{ + struct rds_rdma_args *args; + struct cmsghdr *cmsg; + + for_each_cmsghdr(cmsg, msg) { + if (!CMSG_OK(msg, cmsg)) + return -EINVAL; + + if (cmsg->cmsg_level != SOL_RDS) + continue; + + if (cmsg->cmsg_type == RDS_CMSG_RDMA_ARGS) { + args = CMSG_DATA(cmsg); + *rdma_bytes += args->remote_vec.bytes; + } + } + return 0; +} + int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len) { struct sock *sk = sock->sk; @@ -1008,6 +1028,7 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len) int nonblock = msg->msg_flags & MSG_DONTWAIT; long timeo = sock_sndtimeo(sk, nonblock); struct rds_conn_path *cpath; + size_t total_payload_len = payload_len, rdma_payload_len = 0; /* Mirror Linux UDP mirror of BSD error message compatibility */ /* XXX: Perhaps MSG_MORE someday */ @@ -1040,6 +1061,16 @@ int rds_sendmsg(struct socket *sock, struct msghdr *msg, size_t payload_len) } release_sock(sk); + ret = rds_rdma_bytes(msg, &rdma_payload_len); + if (ret) + goto out; + + total_payload_len += rdma_payload_len; + if (max_t(size_t, payload_len, rdma_payload_len) > RDS_MAX_MSG_SIZE) { + ret = -EMSGSIZE; + goto out; + } + if (payload_len > rds_sk_sndbuf(rs)) { ret = -EMSGSIZE; goto out; |