2005-04-16 22:20:36 +00:00
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/*
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* DECnet An implementation of the DECnet protocol suite for the LINUX
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* operating system. DECnet is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* DECnet Routing Message Grabulator
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*
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* (C) 2000 ChyGwyn Limited - http://www.chygwyn.com/
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* This code may be copied under the GPL v.2 or at your option
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* any later version.
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*
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* Author: Steven Whitehouse <steve@chygwyn.com>
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*
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*/
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#include <linux/module.h>
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#include <linux/skbuff.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/slab.h>
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2005-04-16 22:20:36 +00:00
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#include <linux/init.h>
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#include <linux/netdevice.h>
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#include <linux/netfilter.h>
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#include <linux/spinlock.h>
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2013-03-27 06:47:04 +00:00
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#include <net/netlink.h>
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2005-08-16 03:35:44 +00:00
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#include <linux/netfilter_decnet.h>
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2005-04-16 22:20:36 +00:00
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#include <net/sock.h>
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#include <net/flow.h>
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#include <net/dn.h>
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#include <net/dn_route.h>
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static struct sock *dnrmg = NULL;
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static struct sk_buff *dnrmg_build_message(struct sk_buff *rt_skb, int *errp)
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{
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struct sk_buff *skb = NULL;
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size_t size;
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2007-04-20 03:29:13 +00:00
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sk_buff_data_t old_tail;
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2005-04-16 22:20:36 +00:00
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struct nlmsghdr *nlh;
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unsigned char *ptr;
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struct nf_dn_rtmsg *rtm;
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2013-03-27 06:47:04 +00:00
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size = NLMSG_ALIGN(rt_skb->len) +
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NLMSG_ALIGN(sizeof(struct nf_dn_rtmsg));
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skb = nlmsg_new(size, GFP_ATOMIC);
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2012-06-27 04:25:55 +00:00
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if (!skb) {
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*errp = -ENOMEM;
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return NULL;
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}
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2005-04-16 22:20:36 +00:00
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old_tail = skb->tail;
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2013-03-27 06:47:04 +00:00
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nlh = nlmsg_put(skb, 0, 0, 0, size, 0);
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2012-06-27 04:25:55 +00:00
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if (!nlh) {
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kfree_skb(skb);
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*errp = -ENOMEM;
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return NULL;
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}
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2013-03-27 06:47:04 +00:00
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rtm = (struct nf_dn_rtmsg *)nlmsg_data(nlh);
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2005-04-16 22:20:36 +00:00
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rtm->nfdn_ifindex = rt_skb->dev->ifindex;
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ptr = NFDN_RTMSG(rtm);
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2007-03-31 14:55:45 +00:00
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skb_copy_from_linear_data(rt_skb, ptr, rt_skb->len);
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2005-04-16 22:20:36 +00:00
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nlh->nlmsg_len = skb->tail - old_tail;
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return skb;
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}
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static void dnrmg_send_peer(struct sk_buff *skb)
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{
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struct sk_buff *skb2;
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int status = 0;
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int group = 0;
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unsigned char flags = *skb->data;
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2011-07-01 09:43:03 +00:00
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switch (flags & DN_RT_CNTL_MSK) {
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case DN_RT_PKT_L1RT:
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group = DNRNG_NLGRP_L1;
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break;
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case DN_RT_PKT_L2RT:
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group = DNRNG_NLGRP_L2;
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break;
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default:
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return;
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2005-04-16 22:20:36 +00:00
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}
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skb2 = dnrmg_build_message(skb, &status);
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if (skb2 == NULL)
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return;
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2005-08-15 02:29:52 +00:00
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NETLINK_CB(skb2).dst_group = group;
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2005-04-16 22:20:36 +00:00
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netlink_broadcast(dnrmg, skb2, 0, group, GFP_ATOMIC);
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}
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2013-10-10 07:21:55 +00:00
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static unsigned int dnrmg_hook(const struct nf_hook_ops *ops,
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2007-10-15 07:53:15 +00:00
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struct sk_buff *skb,
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2005-04-16 22:20:36 +00:00
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const struct net_device *in,
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const struct net_device *out,
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int (*okfn)(struct sk_buff *))
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{
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2007-10-15 07:53:15 +00:00
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dnrmg_send_peer(skb);
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2005-04-16 22:20:36 +00:00
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return NF_ACCEPT;
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}
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#define RCV_SKB_FAIL(err) do { netlink_ack(skb, nlh, (err)); return; } while (0)
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static inline void dnrmg_receive_user_skb(struct sk_buff *skb)
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{
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2007-04-26 02:08:35 +00:00
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struct nlmsghdr *nlh = nlmsg_hdr(skb);
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2005-04-16 22:20:36 +00:00
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if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
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return;
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2014-04-23 21:29:27 +00:00
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if (!netlink_capable(skb, CAP_NET_ADMIN))
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2005-04-16 22:20:36 +00:00
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RCV_SKB_FAIL(-EPERM);
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/* Eventually we might send routing messages too */
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RCV_SKB_FAIL(-EINVAL);
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}
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2007-12-05 09:23:00 +00:00
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static struct nf_hook_ops dnrmg_ops __read_mostly = {
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2005-04-16 22:20:36 +00:00
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.hook = dnrmg_hook,
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2012-05-14 03:56:35 +00:00
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.pf = NFPROTO_DECNET,
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2005-04-16 22:20:36 +00:00
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.hooknum = NF_DN_ROUTE,
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.priority = NF_DN_PRI_DNRTMSG,
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};
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2006-03-29 00:37:06 +00:00
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static int __init dn_rtmsg_init(void)
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2005-04-16 22:20:36 +00:00
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{
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int rv = 0;
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2012-06-29 06:15:21 +00:00
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struct netlink_kernel_cfg cfg = {
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.groups = DNRNG_NLGRP_MAX,
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.input = dnrmg_receive_user_skb,
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};
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2005-04-16 22:20:36 +00:00
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2012-09-08 02:53:54 +00:00
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dnrmg = netlink_kernel_create(&init_net, NETLINK_DNRTMSG, &cfg);
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2005-04-16 22:20:36 +00:00
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if (dnrmg == NULL) {
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printk(KERN_ERR "dn_rtmsg: Cannot create netlink socket");
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return -ENOMEM;
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}
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rv = nf_register_hook(&dnrmg_ops);
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if (rv) {
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2008-01-28 22:41:19 +00:00
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netlink_kernel_release(dnrmg);
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2005-04-16 22:20:36 +00:00
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}
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return rv;
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}
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2006-03-29 00:37:06 +00:00
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static void __exit dn_rtmsg_fini(void)
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2005-04-16 22:20:36 +00:00
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{
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nf_unregister_hook(&dnrmg_ops);
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2008-01-28 22:41:19 +00:00
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netlink_kernel_release(dnrmg);
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2005-04-16 22:20:36 +00:00
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}
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MODULE_DESCRIPTION("DECnet Routing Message Grabulator");
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MODULE_AUTHOR("Steven Whitehouse <steve@chygwyn.com>");
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MODULE_LICENSE("GPL");
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2005-08-10 02:40:55 +00:00
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MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_DNRTMSG);
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2005-04-16 22:20:36 +00:00
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2006-03-29 00:37:06 +00:00
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module_init(dn_rtmsg_init);
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module_exit(dn_rtmsg_fini);
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2005-04-16 22:20:36 +00:00
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