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authorJon Maloy <jmaloy@redhat.com>2021-06-02 20:44:25 +0300
committerDavid S. Miller <davem@davemloft.net>2021-06-04 00:06:39 +0300
commit62633c2f17f1f0e6dd6932f990ade9525204ea24 (patch)
tree9ea19e00dfa756ed1595f7816e7993d4ec44172d /net/tipc
parent14623e005a1e74864afca1261a3aa8e6e8017df9 (diff)
downloadlinux-62633c2f17f1f0e6dd6932f990ade9525204ea24.tar.xz
tipc: refactor function tipc_sk_anc_data_recv()
We refactor tipc_sk_anc_data_recv() to make it slightly more comprehensible, but also to facilitate application of some additions to the code in a future commit. Reviewed-by: Xin Long <lucien.xin@gmail.com> Tested-by: Hoang Le <hoang.h.le@dektech.com.au> Signed-off-by: Jon Maloy <jmaloy@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/tipc')
-rw-r--r--net/tipc/socket.c85
1 files changed, 38 insertions, 47 deletions
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index cb2d9fffbc5d..c635fd27fb38 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -1733,67 +1733,58 @@ static void tipc_sk_set_orig_addr(struct msghdr *m, struct sk_buff *skb)
static int tipc_sk_anc_data_recv(struct msghdr *m, struct sk_buff *skb,
struct tipc_sock *tsk)
{
- struct tipc_msg *msg;
- u32 anc_data[3];
- u32 err;
- u32 dest_type;
- int has_name;
- int res;
+ struct tipc_msg *hdr;
+ u32 data[3] = {0,};
+ bool has_addr;
+ int dlen, rc;
if (likely(m->msg_controllen == 0))
return 0;
- msg = buf_msg(skb);
- /* Optionally capture errored message object(s) */
- err = msg ? msg_errcode(msg) : 0;
- if (unlikely(err)) {
- anc_data[0] = err;
- anc_data[1] = msg_data_sz(msg);
- res = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, anc_data);
- if (res)
- return res;
- if (anc_data[1]) {
- if (skb_linearize(skb))
- return -ENOMEM;
- msg = buf_msg(skb);
- res = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, anc_data[1],
- msg_data(msg));
- if (res)
- return res;
- }
+ hdr = buf_msg(skb);
+ dlen = msg_data_sz(hdr);
+
+ /* Capture errored message object, if any */
+ if (msg_errcode(hdr)) {
+ if (skb_linearize(skb))
+ return -ENOMEM;
+ hdr = buf_msg(skb);
+ data[0] = msg_errcode(hdr);
+ data[1] = dlen;
+ rc = put_cmsg(m, SOL_TIPC, TIPC_ERRINFO, 8, data);
+ if (rc || !dlen)
+ return rc;
+ rc = put_cmsg(m, SOL_TIPC, TIPC_RETDATA, dlen, msg_data(hdr));
+ if (rc)
+ return rc;
}
- /* Optionally capture message destination object */
- dest_type = msg ? msg_type(msg) : TIPC_DIRECT_MSG;
- switch (dest_type) {
+ /* Capture TIPC_SERVICE_ADDR/RANGE destination address, if any */
+ switch (msg_type(hdr)) {
case TIPC_NAMED_MSG:
- has_name = 1;
- anc_data[0] = msg_nametype(msg);
- anc_data[1] = msg_namelower(msg);
- anc_data[2] = msg_namelower(msg);
+ has_addr = true;
+ data[0] = msg_nametype(hdr);
+ data[1] = msg_namelower(hdr);
+ data[2] = data[1];
break;
case TIPC_MCAST_MSG:
- has_name = 1;
- anc_data[0] = msg_nametype(msg);
- anc_data[1] = msg_namelower(msg);
- anc_data[2] = msg_nameupper(msg);
+ has_addr = true;
+ data[0] = msg_nametype(hdr);
+ data[1] = msg_namelower(hdr);
+ data[2] = msg_nameupper(hdr);
break;
case TIPC_CONN_MSG:
- has_name = !!tsk->conn_addrtype;
- anc_data[0] = msg_nametype(&tsk->phdr);
- anc_data[1] = msg_nameinst(&tsk->phdr);
- anc_data[2] = anc_data[1];
+ has_addr = !!tsk->conn_addrtype;
+ data[0] = msg_nametype(&tsk->phdr);
+ data[1] = msg_nameinst(&tsk->phdr);
+ data[2] = data[1];
break;
default:
- has_name = 0;
- }
- if (has_name) {
- res = put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, anc_data);
- if (res)
- return res;
+ has_addr = false;
}
-
- return 0;
+ if (!has_addr)
+ return 0;
+ return put_cmsg(m, SOL_TIPC, TIPC_DESTNAME, 12, data);
}
static struct sk_buff *tipc_sk_build_ack(struct tipc_sock *tsk)