diff options
Diffstat (limited to 'arch/um/drivers/umcast_kern.c')
| -rw-r--r-- | arch/um/drivers/umcast_kern.c | 188 |
1 files changed, 188 insertions, 0 deletions
diff --git a/arch/um/drivers/umcast_kern.c b/arch/um/drivers/umcast_kern.c new file mode 100644 index 000000000..595a54f2b --- /dev/null +++ b/arch/um/drivers/umcast_kern.c @@ -0,0 +1,188 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * user-mode-linux networking multicast transport + * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org> + * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com) + * + * based on the existing uml-networking code, which is + * Copyright (C) 2001 Lennert Buytenhek (buytenh@gnu.org) and + * James Leu (jleu@mindspring.net). + * Copyright (C) 2001 by various other people who didn't put their name here. + * + */ + +#include <linux/init.h> +#include <linux/netdevice.h> +#include "umcast.h" +#include <net_kern.h> + +struct umcast_init { + char *addr; + int lport; + int rport; + int ttl; + bool unicast; +}; + +static void umcast_init(struct net_device *dev, void *data) +{ + struct uml_net_private *pri; + struct umcast_data *dpri; + struct umcast_init *init = data; + + pri = netdev_priv(dev); + dpri = (struct umcast_data *) pri->user; + dpri->addr = init->addr; + dpri->lport = init->lport; + dpri->rport = init->rport; + dpri->unicast = init->unicast; + dpri->ttl = init->ttl; + dpri->dev = dev; + + if (dpri->unicast) { + printk(KERN_INFO "ucast backend address: %s:%u listen port: " + "%u\n", dpri->addr, dpri->rport, dpri->lport); + } else { + printk(KERN_INFO "mcast backend multicast address: %s:%u, " + "TTL:%u\n", dpri->addr, dpri->lport, dpri->ttl); + } +} + +static int umcast_read(int fd, struct sk_buff *skb, struct uml_net_private *lp) +{ + return net_recvfrom(fd, skb_mac_header(skb), + skb->dev->mtu + ETH_HEADER_OTHER); +} + +static int umcast_write(int fd, struct sk_buff *skb, struct uml_net_private *lp) +{ + return umcast_user_write(fd, skb->data, skb->len, + (struct umcast_data *) &lp->user); +} + +static const struct net_kern_info umcast_kern_info = { + .init = umcast_init, + .protocol = eth_protocol, + .read = umcast_read, + .write = umcast_write, +}; + +static int mcast_setup(char *str, char **mac_out, void *data) +{ + struct umcast_init *init = data; + char *port_str = NULL, *ttl_str = NULL, *remain; + char *last; + + *init = ((struct umcast_init) + { .addr = "239.192.168.1", + .lport = 1102, + .ttl = 1 }); + + remain = split_if_spec(str, mac_out, &init->addr, &port_str, &ttl_str, + NULL); + if (remain != NULL) { + printk(KERN_ERR "mcast_setup - Extra garbage on " + "specification : '%s'\n", remain); + return 0; + } + + if (port_str != NULL) { + init->lport = simple_strtoul(port_str, &last, 10); + if ((*last != '\0') || (last == port_str)) { + printk(KERN_ERR "mcast_setup - Bad port : '%s'\n", + port_str); + return 0; + } + } + + if (ttl_str != NULL) { + init->ttl = simple_strtoul(ttl_str, &last, 10); + if ((*last != '\0') || (last == ttl_str)) { + printk(KERN_ERR "mcast_setup - Bad ttl : '%s'\n", + ttl_str); + return 0; + } + } + + init->unicast = false; + init->rport = init->lport; + + printk(KERN_INFO "Configured mcast device: %s:%u-%u\n", init->addr, + init->lport, init->ttl); + + return 1; +} + +static int ucast_setup(char *str, char **mac_out, void *data) +{ + struct umcast_init *init = data; + char *lport_str = NULL, *rport_str = NULL, *remain; + char *last; + + *init = ((struct umcast_init) + { .addr = "", + .lport = 1102, + .rport = 1102 }); + + remain = split_if_spec(str, mac_out, &init->addr, + &lport_str, &rport_str, NULL); + if (remain != NULL) { + printk(KERN_ERR "ucast_setup - Extra garbage on " + "specification : '%s'\n", remain); + return 0; + } + + if (lport_str != NULL) { + init->lport = simple_strtoul(lport_str, &last, 10); + if ((*last != '\0') || (last == lport_str)) { + printk(KERN_ERR "ucast_setup - Bad listen port : " + "'%s'\n", lport_str); + return 0; + } + } + + if (rport_str != NULL) { + init->rport = simple_strtoul(rport_str, &last, 10); + if ((*last != '\0') || (last == rport_str)) { + printk(KERN_ERR "ucast_setup - Bad remote port : " + "'%s'\n", rport_str); + return 0; + } + } + + init->unicast = true; + + printk(KERN_INFO "Configured ucast device: :%u -> %s:%u\n", + init->lport, init->addr, init->rport); + + return 1; +} + +static struct transport mcast_transport = { + .list = LIST_HEAD_INIT(mcast_transport.list), + .name = "mcast", + .setup = mcast_setup, + .user = &umcast_user_info, + .kern = &umcast_kern_info, + .private_size = sizeof(struct umcast_data), + .setup_size = sizeof(struct umcast_init), +}; + +static struct transport ucast_transport = { + .list = LIST_HEAD_INIT(ucast_transport.list), + .name = "ucast", + .setup = ucast_setup, + .user = &umcast_user_info, + .kern = &umcast_kern_info, + .private_size = sizeof(struct umcast_data), + .setup_size = sizeof(struct umcast_init), +}; + +static int register_umcast(void) +{ + register_transport(&mcast_transport); + register_transport(&ucast_transport); + return 0; +} + +late_initcall(register_umcast); |