minix3/net/lwip/raw_ip.c

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2020-02-21 00:59:27 +05:30
#include <stdlib.h>
#include <sys/ioc_net.h>
#include <net/gen/in.h>
#include <net/gen/ip_io.h>
#include <lwip/raw.h>
#include <lwip/ip_addr.h>
#include <minix/netsock.h>
#include "proto.h"
#define RAW_IP_BUF_SIZE (32 << 10)
#define sock_alloc_buf(s) debug_malloc(s)
#define sock_free_buf(x) debug_free(x)
struct raw_ip_recv_data {
ip_addr_t ip;
struct pbuf * pbuf;
};
#define raw_ip_recv_alloc() debug_malloc(sizeof(struct raw_ip_recv_data))
static void raw_ip_recv_free(void * data)
{
if (((struct raw_ip_recv_data *)data)->pbuf)
pbuf_free(((struct raw_ip_recv_data *)data)->pbuf);
debug_free(data);
}
static int raw_ip_op_open(struct socket * sock)
{
debug_print("socket num %ld", get_sock_num(sock));
if (!(sock->buf = sock_alloc_buf(RAW_IP_BUF_SIZE))) {
return ENOMEM;
}
sock->buf_size = RAW_IP_BUF_SIZE;
return OK;
}
static void raw_ip_close(struct socket * sock)
{
/* deque and free all enqueued data before closing */
sock_dequeue_data_all(sock, raw_ip_recv_free);
if (sock->pcb)
raw_remove(sock->pcb);
if (sock->buf)
sock_free_buf(sock->buf);
/* mark it as unused */
sock->ops = NULL;
}
static int raw_ip_op_close(struct socket * sock)
{
debug_print("socket num %ld", get_sock_num(sock));
raw_ip_close(sock);
return OK;
}
static int raw_ip_do_receive(struct sock_req *req,
struct pbuf *pbuf)
{
struct pbuf * p;
size_t rem_len = req->size;
unsigned int written = 0, hdr_sz = 0;
int err;
debug_print("user buffer size : %u\n", rem_len);
for (p = pbuf; p && rem_len; p = p->next) {
size_t cp_len;
cp_len = (rem_len < p->len) ? rem_len : p->len;
err = copy_to_user(req->endpt, p->payload, cp_len, req->grant,
hdr_sz + written);
if (err != OK)
return err;
written += cp_len;
rem_len -= cp_len;
}
debug_print("copied %d bytes\n", written + hdr_sz);
return written + hdr_sz;
}
static u8_t raw_ip_op_receive(void *arg,
__unused struct raw_pcb *pcb,
struct pbuf *pbuf,
ip_addr_t *addr)
{
struct socket * sock = (struct socket *) arg;
struct raw_ip_recv_data * data;
int ret;
debug_print("socket num : %ld addr : %x\n",
get_sock_num(sock), (unsigned int) addr->addr);
if (sock->flags & SOCK_FLG_OP_PENDING) {
/* we are resuming a suspended operation */
ret = raw_ip_do_receive(&sock->req, pbuf);
send_req_reply(&sock->req, ret);
sock->flags &= ~SOCK_FLG_OP_PENDING;
if (ret > 0) {
if (sock->usr_flags & NWIO_EXCL) {
pbuf_free(pbuf);
return 1;
} else
return 0;
}
}
/* Do not enqueue more data than allowed */
if (sock->recv_data_size > RAW_IP_BUF_SIZE)
return 0;
/*
* nobody is waiting for the data or an error occured above, we enqueue
* the packet
*/
if (!(data = raw_ip_recv_alloc())) {
return 0;
}
data->ip = *addr;
if (sock->usr_flags & NWIO_EXCL) {
data->pbuf = pbuf;
ret = 1;
} else {
/* we store a copy of this packet */
data->pbuf = pbuf_alloc(PBUF_RAW, pbuf->tot_len, PBUF_RAM);
if (data->pbuf == NULL) {
debug_print("LWIP : cannot allocated new pbuf\n");
raw_ip_recv_free(data);
return 0;
}
if (pbuf_copy(data->pbuf, pbuf) != ERR_OK) {
debug_print("LWIP : cannot copy pbuf\n");
raw_ip_recv_free(data);
return 0;
}
ret = 0;
}
/*
* If we didn't managed to enqueue the packet we report it as not
* consumed
*/
if (sock_enqueue_data(sock, data, data->pbuf->tot_len) != OK) {
raw_ip_recv_free(data);
ret = 0;
}
return ret;
}
static int raw_ip_op_read(struct socket * sock, struct sock_req * req, int blk)
{
debug_print("socket num %ld", get_sock_num(sock));
if (sock->pcb == NULL)
return EIO;
if (sock->recv_head) {
/* data available receive immeditely */
struct raw_ip_recv_data * data;
int ret;
data = (struct raw_ip_recv_data *) sock->recv_head->data;
ret = raw_ip_do_receive(req, data->pbuf);
if (ret > 0) {
sock_dequeue_data(sock);
sock->recv_data_size -= data->pbuf->tot_len;
raw_ip_recv_free(data);
}
return ret;
} else if (!blk)
return EAGAIN;
else {
/* store the request so we know how to reply */
sock->req = *req;
/* operation is being processes */
sock->flags |= SOCK_FLG_OP_PENDING;
debug_print("no data to read, suspending");
return EDONTREPLY;
}
}
static int raw_ip_op_write(struct socket * sock, struct sock_req * req,
__unused int blk)
{
int ret;
struct pbuf * pbuf;
struct ip_hdr * ip_hdr;
debug_print("socket num %ld data size %u",
get_sock_num(sock), req->size);
if (sock->pcb == NULL)
return EIO;
if (req->size > sock->buf_size)
return ENOMEM;
pbuf = pbuf_alloc(PBUF_LINK, req->size, PBUF_RAM);
if (!pbuf)
return ENOMEM;
if ((ret = copy_from_user(req->endpt, pbuf->payload, req->size,
req->grant, 0)) != OK) {
pbuf_free(pbuf);
return ret;
}
ip_hdr = (struct ip_hdr *) pbuf->payload;
if (pbuf_header(pbuf, -IP_HLEN)) {
pbuf_free(pbuf);
return EIO;
}
if ((ret = raw_sendto((struct raw_pcb *)sock->pcb, pbuf,
(ip_addr_t *) &ip_hdr->dest)) != OK) {
debug_print("raw_sendto failed %d", ret);
ret = EIO;
} else
ret = req->size;
pbuf_free(pbuf);
return ret;
}
static int raw_ip_set_opt(struct socket * sock, endpoint_t endpt,
cp_grant_id_t grant)
{
int err;
nwio_ipopt_t ipopt;
struct raw_pcb * pcb;
err = copy_from_user(endpt, &ipopt, sizeof(ipopt), grant, 0);
if (err != OK)
return err;
debug_print("ipopt.nwio_flags = 0x%x", ipopt.nwio_flags);
debug_print("ipopt.nwio_proto = 0x%x", ipopt.nwio_proto);
debug_print("ipopt.nwio_rem = 0x%x",
(unsigned int) ipopt.nwio_rem);
if (sock->pcb == NULL) {
if (!(pcb = raw_new(ipopt.nwio_proto))) {
raw_ip_close(sock);
return ENOMEM;
}
sock->pcb = pcb;
} else
pcb = (struct raw_pcb *) sock->pcb;
if (pcb->protocol != ipopt.nwio_proto) {
debug_print("conflicting ip socket protocols\n");
return EINVAL;
}
sock->usr_flags = ipopt.nwio_flags;
#if 0
if (raw_bind(pcb, (ip_addr_t *)&ipopt.nwio_rem) == ERR_USE) {
raw_ip_close(sock);
return EADDRINUSE;
}
#endif
/* register a receive hook */
raw_recv((struct raw_pcb *) sock->pcb, raw_ip_op_receive, sock);
return OK;
}
static int raw_ip_get_opt(struct socket * sock, endpoint_t endpt,
cp_grant_id_t grant)
{
nwio_ipopt_t ipopt;
struct raw_pcb * pcb = (struct raw_pcb *) sock->pcb;
assert(pcb);
ipopt.nwio_rem = pcb->remote_ip.addr;
ipopt.nwio_flags = sock->usr_flags;
return copy_to_user(endpt, &ipopt, sizeof(ipopt), grant, 0);
}
static int raw_ip_op_ioctl(struct socket * sock, struct sock_req * req,
__unused int blk)
{
int r;
debug_print("socket num %ld req %c %ld %ld",
get_sock_num(sock),
(unsigned char) (req->req >> 8),
req->req & 0xff,
_MINIX_IOCTL_SIZE(req->req));
switch (req->req) {
case NWIOSIPOPT:
r = raw_ip_set_opt(sock, req->endpt, req->grant);
break;
case NWIOGIPOPT:
r = raw_ip_get_opt(sock, req->endpt, req->grant);
break;
default:
/*
* /dev/ip can be also accessed as a default device to be
* configured
*/
r = nic_default_ioctl(req);
}
return r;
}
struct sock_ops sock_raw_ip_ops = {
.open = raw_ip_op_open,
.close = raw_ip_op_close,
.read = raw_ip_op_read,
.write = raw_ip_op_write,
.ioctl = raw_ip_op_ioctl,
.select = generic_op_select,
.select_reply = generic_op_select_reply
};