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    Subject[PATCH V2 2/7] net: lorawan: Add LoRaWAN socket module
    Date
    This patch adds a new address/protocol family for LoRaWAN network.
    It also implements the the functions and maps to Datagram socket for
    LoRaWAN unconfirmed data messages.

    Signed-off-by: Jian-Hong Pan <starnight@g.ncu.edu.tw>
    ---
    V2:
    - Split the LoRaWAN class module patch in V1 into LoRaWAN socket and
    LoRaWAN Soft MAC modules
    - Add lorawan_netdev.h header file for network address related
    declaration
    - Use SPDX license identifiers

    include/linux/lora/lorawan_netdev.h | 52 +++
    net/lorawan/Kconfig | 10 +
    net/lorawan/Makefile | 2 +
    net/lorawan/socket.c | 681 ++++++++++++++++++++++++++++
    4 files changed, 745 insertions(+)
    create mode 100644 include/linux/lora/lorawan_netdev.h
    create mode 100644 net/lorawan/Kconfig
    create mode 100644 net/lorawan/Makefile
    create mode 100644 net/lorawan/socket.c

    diff --git a/include/linux/lora/lorawan_netdev.h b/include/linux/lora/lorawan_netdev.h
    new file mode 100644
    index 000000000000..4adf93fd06c5
    --- /dev/null
    +++ b/include/linux/lora/lorawan_netdev.h
    @@ -0,0 +1,52 @@
    +/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */
    +/*-
    + * LoRaWAN stack related definitions
    + *
    + * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw>
    + *
    + */
    +
    +#ifndef __LORAWAN_NET_DEVICE_H__
    +#define __LORAWAN_NET_DEVICE_H__
    +
    +enum {
    + LRW_ADDR_APPEUI,
    + LRW_ADDR_DEVEUI,
    + LRW_ADDR_DEVADDR,
    +};
    +
    +struct lrw_addr_in {
    + int addr_type;
    + union {
    + u64 app_eui;
    + u64 dev_eui;
    + u32 devaddr;
    + };
    +};
    +
    +struct sockaddr_lorawan {
    + sa_family_t family; /* AF_LORAWAN */
    + struct lrw_addr_in addr_in;
    +};
    +
    +/**
    + * lrw_mac_cb - This structure holds the control buffer (cb) of sk_buff
    + *
    + * @devaddr: the LoRaWAN device address of this LoRaWAN hardware
    + */
    +struct lrw_mac_cb {
    + u32 devaddr;
    +};
    +
    +/**
    + * mac_cb - Get the LoRaWAN MAC control buffer of the sk_buff
    + * @skb: the exchanging sk_buff
    + *
    + * Return: the pointer of LoRaWAN MAC control buffer
    + */
    +static inline struct lrw_mac_cb * mac_cb(struct sk_buff *skb)
    +{
    + return (struct lrw_mac_cb *)skb->cb;
    +}
    +
    +#endif
    diff --git a/net/lorawan/Kconfig b/net/lorawan/Kconfig
    new file mode 100644
    index 000000000000..7f2f344085c4
    --- /dev/null
    +++ b/net/lorawan/Kconfig
    @@ -0,0 +1,10 @@
    +config LORAWAN
    + tristate "LoRaWAN Network support"
    + ---help---
    + LoRaWAN defines low data rate, low power and long range wireless
    + wide area networks. It was designed to organize networks of automation
    + devices, such as sensors, switches and actuators. It can operate
    + multiple kilometers wide.
    +
    + Say Y here to compile LoRaWAN support into the kernel or say M to
    + compile it as a module.
    diff --git a/net/lorawan/Makefile b/net/lorawan/Makefile
    new file mode 100644
    index 000000000000..8c923ca6541a
    --- /dev/null
    +++ b/net/lorawan/Makefile
    @@ -0,0 +1,2 @@
    +obj-$(CONFIG_LORAWAN) += lorawan.o
    +lorawan-objs := socket.o
    diff --git a/net/lorawan/socket.c b/net/lorawan/socket.c
    new file mode 100644
    index 000000000000..0c03f7a0fb0e
    --- /dev/null
    +++ b/net/lorawan/socket.c
    @@ -0,0 +1,681 @@
    +/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */
    +/*-
    + * LoRaWAN stack related definitions
    + *
    + * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw>
    + *
    + */
    +
    +#include <linux/init.h>
    +#include <linux/module.h>
    +#include <linux/list.h>
    +#include <linux/net.h>
    +#include <linux/if_arp.h>
    +#include <linux/termios.h> /* For TIOCOUTQ/INQ */
    +#include <net/sock.h>
    +#include <linux/lora/lorawan_netdev.h>
    +
    +#define LORAWAN_MODULE_NAME "lorawan"
    +
    +#define LRW_DBG_STR(fmt) LORAWAN_MODULE_NAME": "fmt
    +#define lrw_info(fmt, ...) (pr_info(LRW_DBG_STR(fmt), ##__VA_ARGS__))
    +#define lrw_dbg(fmt, ...) (pr_debug(LRW_DBG_STR(fmt), ##__VA_ARGS__))
    +
    +/**
    + * dgram_sock - This structure holds the states of Datagram socket
    + *
    + * @sk: network layer representation of the socket
    + * sk must be the first member of dgram_sock
    + * @src_devaddr: the LoRaWAN device address for this connection
    + * @bound: this socket is bound or not
    + * @connected: this socket is connected to the destination or not
    + * @want_ack: this socket needs to ack for the connection or not
    + */
    +struct dgram_sock {
    + struct sock sk;
    + u32 src_devaddr;
    +
    + u8 bound:1;
    + u8 connected:1;
    +};
    +
    +static HLIST_HEAD(dgram_head);
    +static DEFINE_RWLOCK(dgram_lock);
    +
    +static inline struct dgram_sock *
    +dgram_sk(const struct sock *sk)
    +{
    + return container_of(sk, struct dgram_sock, sk);
    +}
    +
    +static inline struct net_device *
    +lrw_get_dev_by_addr(struct net *net, u32 devaddr)
    +{
    + struct net_device *ndev = NULL;
    + __be32 be_addr = cpu_to_be32(devaddr);
    +
    + rcu_read_lock();
    + ndev = dev_getbyhwaddr_rcu(net, ARPHRD_LORAWAN, (char *)&be_addr);
    + if (ndev)
    + dev_hold(ndev);
    + rcu_read_unlock();
    +
    + return ndev;
    +}
    +
    +static int
    +dgram_init(struct sock *sk)
    +{
    + return 0;
    +}
    +
    +static void
    +dgram_close(struct sock *sk, long timeout)
    +{
    + sk_common_release(sk);
    +}
    +
    +static int
    +dgram_bind(struct sock *sk, struct sockaddr *uaddr, int len)
    +{
    + struct sockaddr_lorawan *addr = (struct sockaddr_lorawan *)uaddr;
    + struct dgram_sock *ro = dgram_sk(sk);
    + struct net_device *ndev;
    + int ret;
    +
    + lock_sock(sk);
    + ro->bound = 0;
    +
    + ret = -EINVAL;
    + if (len < sizeof(*addr))
    + goto dgram_bind_end;
    +
    + if (addr->family != AF_LORAWAN)
    + goto dgram_bind_end;
    +
    + if (addr->addr_in.addr_type != LRW_ADDR_DEVADDR)
    + goto dgram_bind_end;
    +
    + lrw_dbg("%s: bind address %X\n", __func__, addr->addr_in.devaddr);
    + ndev = lrw_get_dev_by_addr(sock_net(sk), addr->addr_in.devaddr);
    + if (!ndev) {
    + ret = -ENODEV;
    + goto dgram_bind_end;
    + }
    + netdev_dbg(ndev, "%s: get ndev\n", __func__);
    +
    + if (ndev->type != ARPHRD_LORAWAN) {
    + ret = -ENODEV;
    + goto dgram_bind_end;
    + }
    +
    + ro->src_devaddr = addr->addr_in.devaddr;
    + ro->bound = 1;
    + ret = 0;
    + dev_put(ndev);
    + lrw_dbg("%s: bound address %X\n", __func__, ro->src_devaddr);
    +
    +dgram_bind_end:
    + release_sock(sk);
    + return ret;
    +}
    +
    +static inline int
    +lrw_dev_hard_header(struct sk_buff *skb, struct net_device *ndev,
    + const u32 src_devaddr, size_t len)
    +{
    + /* TODO: Prepare the LoRaWAN sending header here */
    + return 0;
    +}
    +
    +static int
    +dgram_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
    +{
    + struct dgram_sock *ro = dgram_sk(sk);
    + struct net_device *ndev;
    + struct sk_buff *skb;
    + size_t hlen;
    + size_t tlen;
    + int ret;
    +
    + lrw_dbg("%s: going to send %zu bytes", __func__, size);
    + if (msg->msg_flags & MSG_OOB) {
    + lrw_dbg("msg->msg_flags = 0x%x\n", msg->msg_flags);
    + return -EOPNOTSUPP;
    + }
    +
    + lrw_dbg("%s: check msg_name\n", __func__);
    + if (!ro->connected && !msg->msg_name)
    + return -EDESTADDRREQ;
    + else if (ro->connected && msg->msg_name)
    + return -EISCONN;
    +
    + lrw_dbg("%s: check bound\n", __func__);
    + if (!ro->bound)
    + ndev = dev_getfirstbyhwtype(sock_net(sk), ARPHRD_LORAWAN);
    + else
    + ndev = lrw_get_dev_by_addr(sock_net(sk), ro->src_devaddr);
    +
    + if (!ndev) {
    + lrw_dbg("no dev\n");
    + ret = -ENXIO;
    + goto dgram_sendmsg_end;
    + }
    +
    + if (size > ndev->mtu){
    + netdev_dbg(ndev, "size = %zu, mtu = %u\n", size, ndev->mtu);
    + ret = -EMSGSIZE;
    + goto dgram_sendmsg_end;
    + }
    +
    + netdev_dbg(ndev, "%s: create skb\n", __func__);
    + hlen = LL_RESERVED_SPACE(ndev);
    + tlen = ndev->needed_tailroom;
    + skb = sock_alloc_send_skb(sk, hlen + tlen + size,
    + msg->msg_flags & MSG_DONTWAIT,
    + &ret);
    +
    + if (!skb)
    + goto dgram_sendmsg_no_skb;
    +
    + skb_reserve(skb, hlen);
    + skb_reset_network_header(skb);
    +
    + ret = lrw_dev_hard_header(skb, ndev, 0, size);
    + if (ret < 0)
    + goto dgram_sendmsg_no_skb;
    +
    + ret = memcpy_from_msg(skb_put(skb, size), msg, size);
    + if (ret > 0)
    + goto dgram_sendmsg_err_skb;
    +
    + skb->dev = ndev;
    + skb->protocol = htons(ETH_P_LORAWAN);
    +
    + netdev_dbg(ndev, "%s: push skb to xmit queue\n", __func__);
    + ret = dev_queue_xmit(skb);
    + if (ret > 0)
    + ret = net_xmit_errno(ret);
    + netdev_dbg(ndev, "%s: pushed skb to xmit queue with ret=%d\n",
    + __func__, ret);
    + dev_put(ndev);
    +
    + return ret ?: size;
    +
    +dgram_sendmsg_err_skb:
    + kfree_skb(skb);
    +dgram_sendmsg_no_skb:
    + dev_put(ndev);
    +
    +dgram_sendmsg_end:
    + return ret;
    +}
    +
    +static int
    +dgram_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
    + int noblock, int flags, int *addr_len)
    +{
    + struct sk_buff *skb;
    + size_t copied = 0;
    + DECLARE_SOCKADDR(struct sockaddr_lorawan *, saddr, msg->msg_name);
    + int err;
    +
    + skb = skb_recv_datagram(sk, flags, noblock, &err);
    + if (!skb)
    + goto dgram_recvmsg_end;
    +
    + copied = skb->len;
    + if (len < copied) {
    + msg->msg_flags |= MSG_TRUNC;
    + copied = len;
    + }
    +
    + err = skb_copy_datagram_msg(skb, 0, msg, copied);
    + if (err)
    + goto dgram_recvmsg_done;
    +
    + sock_recv_ts_and_drops(msg, sk, skb);
    + if(saddr) {
    + memset(saddr, 0, sizeof(*saddr));
    + saddr->family = AF_LORAWAN;
    + saddr->addr_in.devaddr = mac_cb(skb)->devaddr;
    + *addr_len = sizeof(*saddr);
    + }
    +
    + if (flags & MSG_TRUNC)
    + copied = skb->len;
    +
    +dgram_recvmsg_done:
    + skb_free_datagram(sk, skb);
    +
    +dgram_recvmsg_end:
    + if (err)
    + return err;
    + return copied;
    +}
    +
    +static int
    +dgram_hash(struct sock *sk)
    +{
    + lrw_dbg("%s\n", __func__);
    + write_lock_bh(&dgram_lock);
    + sk_add_node(sk, &dgram_head);
    + sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
    + write_unlock_bh(&dgram_lock);
    +
    + return 0;
    +}
    +
    +static void
    +dgram_unhash(struct sock *sk)
    +{
    + lrw_dbg("%s\n", __func__);
    + write_lock_bh(&dgram_lock);
    + if (sk_del_node_init(sk))
    + sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
    + write_unlock_bh(&dgram_lock);
    +}
    +
    +static int
    +dgram_connect(struct sock *sk, struct sockaddr *uaddr, int len)
    +{
    + struct dgram_sock *ro = dgram_sk(sk);
    +
    + /* Nodes of LoRaWAN send data to a gateway only, then data is received
    + * and transferred to servers with the gateway's policy.
    + * So, the destination address is not used by nodes.
    + */
    + lock_sock(sk);
    + ro->connected = 1;
    + release_sock(sk);
    +
    + return 0;
    +}
    +
    +static int
    +dgram_disconnect(struct sock *sk, int flags)
    +{
    + struct dgram_sock *ro = dgram_sk(sk);
    +
    + lock_sock(sk);
    + ro->connected = 0;
    + release_sock(sk);
    +
    + return 0;
    +}
    +
    +static int
    +dgram_ioctl(struct sock *sk, int cmd, unsigned long arg)
    +{
    + struct sk_buff *skb;
    + int amount;
    + int err;
    + struct net_device *ndev = sk->sk_dst_cache->dev;
    +
    + netdev_dbg(ndev, "%s: ioctl file (cmd=0x%X)\n", __func__, cmd);
    + switch (cmd) {
    + case SIOCOUTQ:
    + amount = sk_wmem_alloc_get(sk);
    + err = put_user(amount, (int __user *)arg);
    + break;
    + case SIOCINQ:
    + amount = 0;
    + spin_lock_bh(&sk->sk_receive_queue.lock);
    + skb = skb_peek(&sk->sk_receive_queue);
    + if (skb) {
    + /* We will only return the amount of this packet
    + * since that is all that will be read.
    + */
    + amount = skb->len;
    + }
    + spin_unlock_bh(&sk->sk_receive_queue.lock);
    + err = put_user(amount, (int __user *)arg);
    + break;
    + default:
    + err = -ENOIOCTLCMD;
    + }
    +
    + return err;
    +}
    +
    +static int
    +dgram_getsockopt(struct sock *sk, int level, int optname,
    + char __user *optval, int __user *optlen)
    +{
    + int val, len;
    +
    + if (level != SOL_LORAWAN)
    + return -EOPNOTSUPP;
    +
    + if (get_user(len, optlen))
    + return -EFAULT;
    +
    + len = min_t(unsigned int, len, sizeof(int));
    +
    + switch (optname) {
    + default:
    + return -ENOPROTOOPT;
    + }
    +
    + if (put_user(len, optlen))
    + return -EFAULT;
    +
    + if (copy_to_user(optval, &val, len))
    + return -EFAULT;
    +
    + return 0;
    +}
    +
    +static int
    +dgram_setsockopt(struct sock *sk, int level, int optname,
    + char __user *optval, unsigned int optlen)
    +{
    + int val;
    + int err = 0;
    +
    + if (optlen < sizeof(int))
    + return -EINVAL;
    +
    + if (get_user(val, (int __user *)optval))
    + return -EFAULT;
    +
    + lock_sock(sk);
    +
    + switch (optname) {
    + default:
    + err = -ENOPROTOOPT;
    + break;
    + }
    +
    + release_sock(sk);
    +
    + return err;
    +}
    +
    +static struct proto lrw_dgram_prot = {
    + .name = "LoRaWAN",
    + .owner = THIS_MODULE,
    + .obj_size = sizeof(struct dgram_sock),
    + .init = dgram_init,
    + .close = dgram_close,
    + .bind = dgram_bind,
    + .sendmsg = dgram_sendmsg,
    + .recvmsg = dgram_recvmsg,
    + .hash = dgram_hash,
    + .unhash = dgram_unhash,
    + .connect = dgram_connect,
    + .disconnect = dgram_disconnect,
    + .ioctl = dgram_ioctl,
    + .getsockopt = dgram_getsockopt,
    + .setsockopt = dgram_setsockopt,
    +};
    +
    +static int
    +lrw_sock_release(struct socket *sock)
    +{
    + struct sock *sk = sock->sk;
    +
    + if (sk) {
    + sock->sk = NULL;
    + sk->sk_prot->close(sk, 0);
    + }
    +
    + return 0;
    +}
    +
    +static int
    +lrw_sock_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
    +{
    + struct sock *sk = sock->sk;
    + struct sockaddr_lorawan *addr = (struct sockaddr_lorawan *)uaddr;
    +
    + lrw_dbg("%s: bind address %X\n", __func__, addr->addr_in.devaddr);
    + if (sk->sk_prot->bind)
    + return sk->sk_prot->bind(sk, uaddr, addr_len);
    +
    + return sock_no_bind(sock, uaddr, addr_len);
    +}
    +
    +static int
    +lrw_sock_connect(struct socket *sock, struct sockaddr *uaddr,
    + int addr_len, int flags)
    +{
    + struct sock *sk = sock->sk;
    +
    + if (addr_len < sizeof(uaddr->sa_family))
    + return -EINVAL;
    +
    + return sk->sk_prot->connect(sk, uaddr, addr_len);
    +}
    +
    +static int
    +lrw_ndev_ioctl(struct sock *sk, struct ifreq __user *arg, unsigned int cmd)
    +{
    + struct ifreq ifr;
    + int ret = -ENOIOCTLCMD;
    + struct net_device *ndev;
    +
    + lrw_dbg("%s: cmd %ud\n", __func__, cmd);
    + if (copy_from_user(&ifr, arg, sizeof(struct ifreq)))
    + return -EFAULT;
    +
    + ifr.ifr_name[IFNAMSIZ-1] = 0;
    +
    + dev_load(sock_net(sk), ifr.ifr_name);
    + ndev = dev_get_by_name(sock_net(sk), ifr.ifr_name);
    +
    + netdev_dbg(ndev, "%s: cmd %ud\n", __func__, cmd);
    + if (!ndev)
    + return -ENODEV;
    +
    + if (ndev->type == ARPHRD_LORAWAN && ndev->netdev_ops->ndo_do_ioctl)
    + ret = ndev->netdev_ops->ndo_do_ioctl(ndev, &ifr, cmd);
    +
    + if (!ret && copy_to_user(arg, &ifr, sizeof(struct ifreq)))
    + ret = -EFAULT;
    + dev_put(ndev);
    +
    + return ret;
    +}
    +
    +static int
    +lrw_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
    +{
    + struct sock *sk = sock->sk;
    +
    + lrw_dbg("%s: cmd %ud\n", __func__, cmd);
    + switch (cmd) {
    + case SIOCGSTAMP:
    + return sock_get_timestamp(sk, (struct timeval __user *)arg);
    + case SIOCGSTAMPNS:
    + return sock_get_timestampns(sk, (struct timespec __user *)arg);
    + case SIOCOUTQ:
    + case SIOCINQ:
    + if (!sk->sk_prot->ioctl)
    + return -ENOIOCTLCMD;
    + return sk->sk_prot->ioctl(sk, cmd, arg);
    + default:
    + return lrw_ndev_ioctl(sk, (struct ifreq __user *)arg, cmd);
    + }
    +}
    +
    +static int
    +lrw_sock_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
    +{
    + struct sock *sk = sock->sk;
    +
    + lrw_dbg("%s: going to send %zu bytes\n", __func__, len);
    + return sk->sk_prot->sendmsg(sk, msg, len);
    +}
    +
    +static const struct proto_ops lrw_dgram_ops = {
    + .family = PF_LORAWAN,
    + .owner = THIS_MODULE,
    + .release = lrw_sock_release,
    + .bind = lrw_sock_bind,
    + .connect = lrw_sock_connect,
    + .socketpair = sock_no_socketpair,
    + .accept = sock_no_accept,
    + .getname = sock_no_getname,
    + .poll = datagram_poll,
    + .ioctl = lrw_sock_ioctl,
    + .listen = sock_no_listen,
    + .shutdown = sock_no_shutdown,
    + .setsockopt = sock_common_setsockopt,
    + .getsockopt = sock_common_getsockopt,
    + .sendmsg = lrw_sock_sendmsg,
    + .recvmsg = sock_common_recvmsg,
    + .mmap = sock_no_mmap,
    + .sendpage = sock_no_sendpage,
    +};
    +
    +static int
    +lorawan_creat(struct net *net, struct socket *sock, int protocol, int kern)
    +{
    + struct sock *sk;
    + int ret;
    +
    + if (!net_eq(net, &init_net))
    + return -EAFNOSUPPORT;
    +
    + if (sock->type != SOCK_DGRAM)
    + return -EAFNOSUPPORT;
    +
    + /* Allocates enough memory for dgram_sock whose first member is sk */
    + sk = sk_alloc(net, PF_LORAWAN, GFP_KERNEL, &lrw_dgram_prot, kern);
    + if (!sk)
    + return -ENOMEM;
    +
    + sock->ops = &lrw_dgram_ops;
    + sock_init_data(sock, sk);
    + sk->sk_family = PF_LORAWAN;
    + sock_set_flag(sk, SOCK_ZAPPED);
    +
    + if (sk->sk_prot->hash) {
    + ret = sk->sk_prot->hash(sk);
    + if (ret) {
    + sk_common_release(sk);
    + goto lorawan_creat_end;
    + }
    + }
    +
    + if (sk->sk_prot->init) {
    + ret = sk->sk_prot->init(sk);
    + if (ret)
    + sk_common_release(sk);
    + }
    +
    +lorawan_creat_end:
    + return ret;
    +}
    +
    +static const struct net_proto_family lorawan_family_ops = {
    + .owner = THIS_MODULE,
    + .family = PF_LORAWAN,
    + .create = lorawan_creat,
    +};
    +
    +static inline int
    +lrw_dgram_deliver(struct net_device *ndev, struct sk_buff *skb)
    +{
    + struct sock *sk;
    + struct dgram_sock *ro;
    + bool found = false;
    + int ret = NET_RX_SUCCESS;
    +
    + read_lock(&dgram_lock);
    + sk_for_each(sk, &dgram_head) {
    + ro = dgram_sk(sk);
    + if(cpu_to_le32(ro->src_devaddr) == *(__le32 *)ndev->dev_addr) {
    + found = true;
    + break;
    + }
    + }
    + read_unlock(&dgram_lock);
    +
    + if (!found)
    + goto lrw_dgram_deliver_err;
    +
    + skb = skb_share_check(skb, GFP_ATOMIC);
    + if (!skb)
    + return NET_RX_DROP;
    +
    + if (sock_queue_rcv_skb(sk, skb) < 0)
    + goto lrw_dgram_deliver_err;
    +
    + return ret;
    +
    +lrw_dgram_deliver_err:
    + kfree_skb(skb);
    + ret = NET_RX_DROP;
    + return ret;
    +}
    +
    +static int
    +lorawan_rcv(struct sk_buff *skb, struct net_device *ndev,
    + struct packet_type *pt, struct net_device *orig_ndev)
    +{
    + if (!netif_running(ndev))
    + goto lorawan_rcv_drop;
    +
    + if (!net_eq(dev_net(ndev), &init_net))
    + goto lorawan_rcv_drop;
    +
    + if (ndev->type != ARPHRD_LORAWAN)
    + goto lorawan_rcv_drop;
    +
    + if (skb->pkt_type != PACKET_OTHERHOST)
    + return lrw_dgram_deliver(ndev, skb);
    +
    +lorawan_rcv_drop:
    + kfree_skb(skb);
    + return NET_RX_DROP;
    +}
    +
    +static struct packet_type lorawan_packet_type = {
    + .type = htons(ETH_P_LORAWAN),
    + .func = lorawan_rcv,
    +};
    +
    +static int __init
    +lrw_sock_init(void)
    +{
    + int ret;
    +
    + lrw_info("module inserted\n");
    + ret = proto_register(&lrw_dgram_prot, 1);
    + if(ret)
    + goto lrw_sock_init_end;
    +
    + /* Tell SOCKET that we are alive */
    + ret = sock_register(&lorawan_family_ops);
    + if(ret)
    + goto lrw_sock_init_err;
    +
    + dev_add_pack(&lorawan_packet_type);
    + ret = 0;
    + goto lrw_sock_init_end;
    +
    +lrw_sock_init_err:
    + proto_unregister(&lrw_dgram_prot);
    +
    +lrw_sock_init_end:
    + return 0;
    +}
    +
    +static void __exit
    +lrw_sock_exit(void)
    +{
    + dev_remove_pack(&lorawan_packet_type);
    + sock_unregister(PF_LORAWAN);
    + proto_unregister(&lrw_dgram_prot);
    + lrw_info("module removed\n");
    +}
    +
    +module_init(lrw_sock_init);
    +module_exit(lrw_sock_exit);
    +
    +MODULE_AUTHOR("Jian-Hong Pan, <starnight@g.ncu.edu.tw>");
    +MODULE_DESCRIPTION("LoRaWAN socket kernel module");
    +MODULE_LICENSE("Dual BSD/GPL");
    +MODULE_ALIAS_NETPROTO(PF_LORAWAN);
    --
    2.19.1
    \
     
     \ /
      Last update: 2018-11-05 17:58    [W:6.267 / U:0.108 seconds]
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