mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-27 22:24:11 +08:00
Phonet: factor common code to send control messages
With the addition of the pipe controller, there is now quite a bit of repetitive code for small signaling messages. Lets factor it. Signed-off-by: Rémi Denis-Courmont <remi.denis-courmont@nokia.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rémi Denis-Courmont
David S. Miller
parent
0ebbf31863
commit
44c9ab16d2
255
net/phonet/pep.c
255
net/phonet/pep.c
@ -77,24 +77,34 @@ static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen,
|
||||
return data;
|
||||
}
|
||||
|
||||
static int pep_reply(struct sock *sk, struct sk_buff *oskb,
|
||||
u8 code, const void *data, int len, gfp_t priority)
|
||||
static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload,
|
||||
int len, gfp_t priority)
|
||||
{
|
||||
struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
|
||||
if (!skb)
|
||||
return NULL;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER);
|
||||
__skb_put(skb, len);
|
||||
skb_copy_to_linear_data(skb, payload, len);
|
||||
__skb_push(skb, sizeof(struct pnpipehdr));
|
||||
skb_reset_transport_header(skb);
|
||||
return skb;
|
||||
}
|
||||
|
||||
static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code,
|
||||
const void *data, int len, gfp_t priority)
|
||||
{
|
||||
const struct pnpipehdr *oph = pnp_hdr(oskb);
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
struct sockaddr_pn peer;
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
|
||||
skb = pep_alloc_skb(sk, data, len, priority);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER);
|
||||
__skb_put(skb, len);
|
||||
skb_copy_to_linear_data(skb, data, len);
|
||||
__skb_push(skb, sizeof(*ph));
|
||||
skb_reset_transport_header(skb);
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = oph->utid;
|
||||
ph->message_id = oph->message_id + 1; /* REQ -> RESP */
|
||||
@ -105,135 +115,69 @@ static int pep_reply(struct sock *sk, struct sk_buff *oskb,
|
||||
return pn_skb_send(sk, skb, &peer);
|
||||
}
|
||||
|
||||
static int pep_indicate(struct sock *sk, u8 id, u8 code,
|
||||
const void *data, int len, gfp_t priority)
|
||||
{
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
|
||||
skb = pep_alloc_skb(sk, data, len, priority);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = 0;
|
||||
ph->message_id = id;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->data[0] = code;
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
}
|
||||
|
||||
#define PAD 0x00
|
||||
|
||||
#ifdef CONFIG_PHONET_PIPECTRLR
|
||||
static int pipe_handler_send_req(struct sock *sk, u8 msg_id, gfp_t priority)
|
||||
static int pipe_handler_request(struct sock *sk, u8 id, u8 code,
|
||||
const void *data, int len)
|
||||
{
|
||||
int len;
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
|
||||
static const u8 data[4] = {
|
||||
PAD, PAD, PAD, PAD,
|
||||
skb = pep_alloc_skb(sk, data, len, GFP_KERNEL);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = id; /* whatever */
|
||||
ph->message_id = id;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->data[0] = code;
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
}
|
||||
|
||||
static int pipe_handler_send_created_ind(struct sock *sk)
|
||||
{
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
u8 data[4] = {
|
||||
PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2),
|
||||
pn->tx_fc, pn->rx_fc,
|
||||
};
|
||||
|
||||
switch (msg_id) {
|
||||
case PNS_PEP_CONNECT_REQ:
|
||||
len = sizeof(data);
|
||||
break;
|
||||
|
||||
case PNS_PEP_DISCONNECT_REQ:
|
||||
case PNS_PEP_ENABLE_REQ:
|
||||
case PNS_PEP_DISABLE_REQ:
|
||||
len = 0;
|
||||
break;
|
||||
|
||||
default:
|
||||
return -EINVAL;
|
||||
return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */,
|
||||
data, 4, GFP_ATOMIC);
|
||||
}
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER);
|
||||
if (len) {
|
||||
__skb_put(skb, len);
|
||||
skb_copy_to_linear_data(skb, data, len);
|
||||
}
|
||||
__skb_push(skb, sizeof(*ph));
|
||||
skb_reset_transport_header(skb);
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = msg_id; /* whatever */
|
||||
ph->message_id = msg_id;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->error_code = PN_PIPE_NO_ERROR;
|
||||
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
}
|
||||
|
||||
static int pipe_handler_send_created_ind(struct sock *sk, u8 msg_id)
|
||||
static int pipe_handler_send_ind(struct sock *sk, u8 id)
|
||||
{
|
||||
int err_code;
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
static u8 data[4] = {
|
||||
0x03, 0x04,
|
||||
};
|
||||
data[2] = pn->tx_fc;
|
||||
data[3] = pn->rx_fc;
|
||||
|
||||
/*
|
||||
* actually, below is number of sub-blocks and not error code.
|
||||
* Pipe_created_ind message format does not have any
|
||||
* error code field. However, the Phonet stack will always send
|
||||
* an error code as part of pnpipehdr. So, use that err_code to
|
||||
* specify the number of sub-blocks.
|
||||
*/
|
||||
err_code = 0x01;
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER + sizeof(data), GFP_ATOMIC);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER);
|
||||
__skb_put(skb, sizeof(data));
|
||||
skb_copy_to_linear_data(skb, data, sizeof(data));
|
||||
__skb_push(skb, sizeof(*ph));
|
||||
skb_reset_transport_header(skb);
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = 0;
|
||||
ph->message_id = msg_id;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->error_code = err_code;
|
||||
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
}
|
||||
|
||||
static int pipe_handler_send_ind(struct sock *sk, u8 msg_id)
|
||||
{
|
||||
int err_code;
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
|
||||
/*
|
||||
* actually, below is a filler.
|
||||
* Pipe_enabled/disabled_ind message format does not have any
|
||||
* error code field. However, the Phonet stack will always send
|
||||
* an error code as part of pnpipehdr. So, use that err_code to
|
||||
* specify the filler value.
|
||||
*/
|
||||
err_code = 0x0;
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER);
|
||||
__skb_push(skb, sizeof(*ph));
|
||||
skb_reset_transport_header(skb);
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = 0;
|
||||
ph->message_id = msg_id;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->error_code = err_code;
|
||||
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
return pep_indicate(sk, id, PAD, NULL, 0, GFP_ATOMIC);
|
||||
}
|
||||
|
||||
static int pipe_handler_enable_pipe(struct sock *sk, int enable)
|
||||
{
|
||||
u8 id = enable ? PNS_PEP_ENABLE_REQ : PNS_PEP_DISABLE_REQ;
|
||||
|
||||
return pipe_handler_send_req(sk, id, GFP_KERNEL);
|
||||
return pipe_handler_request(sk, id, PAD, NULL, 0);
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -274,23 +218,21 @@ static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
|
||||
struct sk_buff *skb;
|
||||
struct pnpipehdr *ph;
|
||||
struct sockaddr_pn dst;
|
||||
u8 data[4] = {
|
||||
oph->data[0], /* PEP type */
|
||||
code, /* error code, at an unusual offset */
|
||||
PAD, PAD,
|
||||
};
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
|
||||
skb = pep_alloc_skb(sk, data, 4, priority);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PHONET_HEADER);
|
||||
ph = (struct pnpipehdr *)skb_put(skb, sizeof(*ph) + 4);
|
||||
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = oph->utid;
|
||||
ph->message_id = PNS_PEP_CTRL_RESP;
|
||||
ph->pipe_handle = oph->pipe_handle;
|
||||
ph->data[0] = oph->data[1]; /* CTRL id */
|
||||
ph->data[1] = oph->data[0]; /* PEP type */
|
||||
ph->data[2] = code; /* error code, at an usual offset */
|
||||
ph->data[3] = PAD;
|
||||
ph->data[4] = PAD;
|
||||
|
||||
pn_skb_get_src_sockaddr(oskb, &dst);
|
||||
return pn_skb_send(sk, skb, &dst);
|
||||
@ -298,34 +240,15 @@ static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code,
|
||||
|
||||
static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority)
|
||||
{
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
u8 data[4] = { type, PAD, PAD, status };
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER + 4, priority);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
skb_set_owner_w(skb, sk);
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER + 4);
|
||||
__skb_push(skb, sizeof(*ph) + 4);
|
||||
skb_reset_transport_header(skb);
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = 0;
|
||||
ph->message_id = PNS_PEP_STATUS_IND;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->pep_type = PN_PEP_TYPE_COMMON;
|
||||
ph->data[1] = type;
|
||||
ph->data[2] = PAD;
|
||||
ph->data[3] = PAD;
|
||||
ph->data[4] = status;
|
||||
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON,
|
||||
data, 4, priority);
|
||||
}
|
||||
|
||||
/* Send our RX flow control information to the sender.
|
||||
* Socket must be locked. */
|
||||
static void pipe_grant_credits(struct sock *sk)
|
||||
static void pipe_grant_credits(struct sock *sk, gfp_t priority)
|
||||
{
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
|
||||
@ -335,8 +258,8 @@ static void pipe_grant_credits(struct sock *sk)
|
||||
case PN_LEGACY_FLOW_CONTROL: /* TODO */
|
||||
break;
|
||||
case PN_ONE_CREDIT_FLOW_CONTROL:
|
||||
pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
|
||||
PEP_IND_READY, GFP_ATOMIC);
|
||||
if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL,
|
||||
PEP_IND_READY, priority) == 0)
|
||||
pn->rx_credits = 1;
|
||||
break;
|
||||
case PN_MULTI_CREDIT_FLOW_CONTROL:
|
||||
@ -344,7 +267,7 @@ static void pipe_grant_credits(struct sock *sk)
|
||||
break;
|
||||
if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS,
|
||||
CREDITS_MAX - pn->rx_credits,
|
||||
GFP_ATOMIC) == 0)
|
||||
priority) == 0)
|
||||
pn->rx_credits = CREDITS_MAX;
|
||||
break;
|
||||
}
|
||||
@ -474,7 +397,7 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
|
||||
if (sk->sk_state == TCP_ESTABLISHED)
|
||||
break; /* Nothing to do */
|
||||
sk->sk_state = TCP_ESTABLISHED;
|
||||
pipe_grant_credits(sk);
|
||||
pipe_grant_credits(sk, GFP_ATOMIC);
|
||||
break;
|
||||
#endif
|
||||
|
||||
@ -561,7 +484,7 @@ static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb)
|
||||
if (sk->sk_state == TCP_ESTABLISHED)
|
||||
break; /* Nothing to do */
|
||||
sk->sk_state = TCP_ESTABLISHED;
|
||||
pipe_grant_credits(sk);
|
||||
pipe_grant_credits(sk, GFP_ATOMIC);
|
||||
break;
|
||||
|
||||
case PNS_PIPE_DISABLED_IND:
|
||||
@ -655,7 +578,7 @@ static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb)
|
||||
pn->rx_credits = 0;
|
||||
sk->sk_state_change(sk);
|
||||
|
||||
return pipe_handler_send_created_ind(sk, PNS_PIPE_CREATED_IND);
|
||||
return pipe_handler_send_created_ind(sk);
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -853,19 +776,15 @@ static int pipe_do_remove(struct sock *sk)
|
||||
struct pnpipehdr *ph;
|
||||
struct sk_buff *skb;
|
||||
|
||||
skb = alloc_skb(MAX_PNPIPE_HEADER, GFP_KERNEL);
|
||||
skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL);
|
||||
if (!skb)
|
||||
return -ENOMEM;
|
||||
|
||||
skb_reserve(skb, MAX_PNPIPE_HEADER);
|
||||
__skb_push(skb, sizeof(*ph));
|
||||
skb_reset_transport_header(skb);
|
||||
ph = pnp_hdr(skb);
|
||||
ph->utid = 0;
|
||||
ph->message_id = PNS_PIPE_REMOVE_REQ;
|
||||
ph->pipe_handle = pn->pipe_handle;
|
||||
ph->data[0] = PAD;
|
||||
|
||||
return pn_skb_send(sk, skb, NULL);
|
||||
}
|
||||
#endif
|
||||
@ -894,7 +813,7 @@ static void pep_sock_close(struct sock *sk, long timeout)
|
||||
pipe_do_remove(sk);
|
||||
#else
|
||||
/* send pep disconnect request */
|
||||
pipe_handler_send_req(sk, PNS_PEP_DISCONNECT_REQ, GFP_KERNEL);
|
||||
pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD, NULL, 0);
|
||||
sk->sk_state = TCP_CLOSE;
|
||||
#endif
|
||||
}
|
||||
@ -980,10 +899,12 @@ static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len)
|
||||
{
|
||||
struct pep_sock *pn = pep_sk(sk);
|
||||
const struct sockaddr_pn *spn = (struct sockaddr_pn *)addr;
|
||||
u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD };
|
||||
|
||||
pn->pn_sk.dobject = pn_sockaddr_get_object(spn);
|
||||
pn->pn_sk.resource = pn_sockaddr_get_resource(spn);
|
||||
return pipe_handler_send_req(sk, PNS_PEP_CONNECT_REQ, GFP_KERNEL);
|
||||
return pipe_handler_request(sk, PNS_PEP_CONNECT_REQ,
|
||||
PN_PIPE_DISABLE, data, 4);
|
||||
}
|
||||
#endif
|
||||
|
||||
@ -1280,7 +1201,7 @@ struct sk_buff *pep_read(struct sock *sk)
|
||||
struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue);
|
||||
|
||||
if (sk->sk_state == TCP_ESTABLISHED)
|
||||
pipe_grant_credits(sk);
|
||||
pipe_grant_credits(sk, GFP_ATOMIC);
|
||||
return skb;
|
||||
}
|
||||
|
||||
@ -1325,7 +1246,7 @@ static int pep_recvmsg(struct kiocb *iocb, struct sock *sk,
|
||||
}
|
||||
|
||||
if (sk->sk_state == TCP_ESTABLISHED)
|
||||
pipe_grant_credits(sk);
|
||||
pipe_grant_credits(sk, GFP_KERNEL);
|
||||
release_sock(sk);
|
||||
copy:
|
||||
msg->msg_flags |= MSG_EOR;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user