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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-17 00:20:36 +0200 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/drivers/mcast_user.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/um/drivers/mcast_user.c')
-rw-r--r-- | arch/um/drivers/mcast_user.c | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/arch/um/drivers/mcast_user.c b/arch/um/drivers/mcast_user.c new file mode 100644 index 000000000000..0fe1d9fa9139 --- /dev/null +++ b/arch/um/drivers/mcast_user.c @@ -0,0 +1,177 @@ +/* + * user-mode-linux networking multicast transport + * Copyright (C) 2001 by Harald Welte <laforge@gnumonks.org> + * + * 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. + * + * Licensed under the GPL. + * + */ + +#include <errno.h> +#include <unistd.h> +#include <linux/inet.h> +#include <sys/socket.h> +#include <sys/un.h> +#include <sys/time.h> +#include <netinet/in.h> +#include "net_user.h" +#include "mcast.h" +#include "kern_util.h" +#include "user_util.h" +#include "user.h" +#include "os.h" + +#define MAX_PACKET (ETH_MAX_PACKET + ETH_HEADER_OTHER) + +static struct sockaddr_in *new_addr(char *addr, unsigned short port) +{ + struct sockaddr_in *sin; + + sin = um_kmalloc(sizeof(struct sockaddr_in)); + if(sin == NULL){ + printk("new_addr: allocation of sockaddr_in failed\n"); + return(NULL); + } + sin->sin_family = AF_INET; + sin->sin_addr.s_addr = in_aton(addr); + sin->sin_port = port; + return(sin); +} + +static void mcast_user_init(void *data, void *dev) +{ + struct mcast_data *pri = data; + + pri->mcast_addr = new_addr(pri->addr, pri->port); + pri->dev = dev; +} + +static int mcast_open(void *data) +{ + struct mcast_data *pri = data; + struct sockaddr_in *sin = pri->mcast_addr; + struct ip_mreq mreq; + int fd, yes = 1; + + + if ((sin->sin_addr.s_addr == 0) || (sin->sin_port == 0)) { + fd = -EINVAL; + goto out; + } + + fd = socket(AF_INET, SOCK_DGRAM, 0); + if (fd < 0){ + printk("mcast_open : data socket failed, errno = %d\n", + errno); + fd = -ENOMEM; + goto out; + } + + if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) { + printk("mcast_open: SO_REUSEADDR failed, errno = %d\n", + errno); + os_close_file(fd); + fd = -EINVAL; + goto out; + } + + /* set ttl according to config */ + if (setsockopt(fd, SOL_IP, IP_MULTICAST_TTL, &pri->ttl, + sizeof(pri->ttl)) < 0) { + printk("mcast_open: IP_MULTICAST_TTL failed, error = %d\n", + errno); + os_close_file(fd); + fd = -EINVAL; + goto out; + } + + /* set LOOP, so data does get fed back to local sockets */ + if (setsockopt(fd, SOL_IP, IP_MULTICAST_LOOP, &yes, sizeof(yes)) < 0) { + printk("mcast_open: IP_MULTICAST_LOOP failed, error = %d\n", + errno); + os_close_file(fd); + fd = -EINVAL; + goto out; + } + + /* bind socket to mcast address */ + if (bind(fd, (struct sockaddr *) sin, sizeof(*sin)) < 0) { + printk("mcast_open : data bind failed, errno = %d\n", errno); + os_close_file(fd); + fd = -EINVAL; + goto out; + } + + /* subscribe to the multicast group */ + mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr; + mreq.imr_interface.s_addr = 0; + if (setsockopt(fd, SOL_IP, IP_ADD_MEMBERSHIP, + &mreq, sizeof(mreq)) < 0) { + printk("mcast_open: IP_ADD_MEMBERSHIP failed, error = %d\n", + errno); + printk("There appears not to be a multicast-capable network " + "interface on the host.\n"); + printk("eth0 should be configured in order to use the " + "multicast transport.\n"); + os_close_file(fd); + fd = -EINVAL; + } + + out: + return(fd); +} + +static void mcast_close(int fd, void *data) +{ + struct ip_mreq mreq; + struct mcast_data *pri = data; + struct sockaddr_in *sin = pri->mcast_addr; + + mreq.imr_multiaddr.s_addr = sin->sin_addr.s_addr; + mreq.imr_interface.s_addr = 0; + if (setsockopt(fd, SOL_IP, IP_DROP_MEMBERSHIP, + &mreq, sizeof(mreq)) < 0) { + printk("mcast_open: IP_DROP_MEMBERSHIP failed, error = %d\n", + errno); + } + + os_close_file(fd); +} + +int mcast_user_write(int fd, void *buf, int len, struct mcast_data *pri) +{ + struct sockaddr_in *data_addr = pri->mcast_addr; + + return(net_sendto(fd, buf, len, data_addr, sizeof(*data_addr))); +} + +static int mcast_set_mtu(int mtu, void *data) +{ + return(mtu); +} + +struct net_user_info mcast_user_info = { + .init = mcast_user_init, + .open = mcast_open, + .close = mcast_close, + .remove = NULL, + .set_mtu = mcast_set_mtu, + .add_address = NULL, + .delete_address = NULL, + .max_packet = MAX_PACKET - ETH_HEADER_OTHER +}; + +/* + * Overrides for Emacs so that we follow Linus's tabbing style. + * Emacs will notice this stuff at the end of the file and automatically + * adjust the settings for this buffer only. This must remain at the end + * of the file. + * --------------------------------------------------------------------------- + * Local variables: + * c-file-style: "linux" + * End: + */ |