WSL2-Linux-Kernel/net/ipx/ipx_route.c

296 строки
6.8 KiB
C
Исходник Обычный вид История

/*
* Implements the IPX routing routines.
* Code moved from af_ipx.c.
*
* Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 2003
*
* See net/ipx/ChangeLog.
*/
#include <linux/list.h>
#include <linux/route.h>
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 11:04:11 +03:00
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <net/ipx.h>
#include <net/sock.h>
LIST_HEAD(ipx_routes);
DEFINE_RWLOCK(ipx_routes_lock);
extern struct ipx_interface *ipx_internal_net;
extern __be16 ipx_cksum(struct ipxhdr *packet, int length);
extern struct ipx_interface *ipxitf_find_using_net(__be32 net);
extern int ipxitf_demux_socket(struct ipx_interface *intrfc,
struct sk_buff *skb, int copy);
extern int ipxitf_demux_socket(struct ipx_interface *intrfc,
struct sk_buff *skb, int copy);
extern int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb,
char *node);
extern struct ipx_interface *ipxitf_find_using_net(__be32 net);
struct ipx_route *ipxrtr_lookup(__be32 net)
{
struct ipx_route *r;
read_lock_bh(&ipx_routes_lock);
list_for_each_entry(r, &ipx_routes, node)
if (r->ir_net == net) {
ipxrtr_hold(r);
goto unlock;
}
r = NULL;
unlock:
read_unlock_bh(&ipx_routes_lock);
return r;
}
/*
* Caller must hold a reference to intrfc
*/
int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc,
unsigned char *node)
{
struct ipx_route *rt;
int rc;
/* Get a route structure; either existing or create */
rt = ipxrtr_lookup(network);
if (!rt) {
rt = kmalloc(sizeof(*rt), GFP_ATOMIC);
rc = -EAGAIN;
if (!rt)
goto out;
atomic_set(&rt->refcnt, 1);
ipxrtr_hold(rt);
write_lock_bh(&ipx_routes_lock);
list_add(&rt->node, &ipx_routes);
write_unlock_bh(&ipx_routes_lock);
} else {
rc = -EEXIST;
if (intrfc == ipx_internal_net)
goto out_put;
}
rt->ir_net = network;
rt->ir_intrfc = intrfc;
if (!node) {
memset(rt->ir_router_node, '\0', IPX_NODE_LEN);
rt->ir_routed = 0;
} else {
memcpy(rt->ir_router_node, node, IPX_NODE_LEN);
rt->ir_routed = 1;
}
rc = 0;
out_put:
ipxrtr_put(rt);
out:
return rc;
}
void ipxrtr_del_routes(struct ipx_interface *intrfc)
{
struct ipx_route *r, *tmp;
write_lock_bh(&ipx_routes_lock);
list_for_each_entry_safe(r, tmp, &ipx_routes, node)
if (r->ir_intrfc == intrfc) {
list_del(&r->node);
ipxrtr_put(r);
}
write_unlock_bh(&ipx_routes_lock);
}
static int ipxrtr_create(struct ipx_route_definition *rd)
{
struct ipx_interface *intrfc;
int rc = -ENETUNREACH;
/* Find the appropriate interface */
intrfc = ipxitf_find_using_net(rd->ipx_router_network);
if (!intrfc)
goto out;
rc = ipxrtr_add_route(rd->ipx_network, intrfc, rd->ipx_router_node);
ipxitf_put(intrfc);
out:
return rc;
}
static int ipxrtr_delete(__be32 net)
{
struct ipx_route *r, *tmp;
int rc;
write_lock_bh(&ipx_routes_lock);
list_for_each_entry_safe(r, tmp, &ipx_routes, node)
if (r->ir_net == net) {
/* Directly connected; can't lose route */
rc = -EPERM;
if (!r->ir_routed)
goto out;
list_del(&r->node);
ipxrtr_put(r);
rc = 0;
goto out;
}
rc = -ENOENT;
out:
write_unlock_bh(&ipx_routes_lock);
return rc;
}
/*
* The skb has to be unshared, we'll end up calling ipxitf_send, that'll
* modify the packet
*/
int ipxrtr_route_skb(struct sk_buff *skb)
{
struct ipxhdr *ipx = ipx_hdr(skb);
struct ipx_route *r = ipxrtr_lookup(IPX_SKB_CB(skb)->ipx_dest_net);
if (!r) { /* no known route */
kfree_skb(skb);
return 0;
}
ipxitf_hold(r->ir_intrfc);
ipxitf_send(r->ir_intrfc, skb, r->ir_routed ?
r->ir_router_node : ipx->ipx_dest.node);
ipxitf_put(r->ir_intrfc);
ipxrtr_put(r);
return 0;
}
/*
* Route an outgoing frame from a socket.
*/
int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx,
struct iovec *iov, size_t len, int noblock)
{
struct sk_buff *skb;
struct ipx_sock *ipxs = ipx_sk(sk);
struct ipx_interface *intrfc;
struct ipxhdr *ipx;
size_t size;
int ipx_offset;
struct ipx_route *rt = NULL;
int rc;
/* Find the appropriate interface on which to send packet */
if (!usipx->sipx_network && ipx_primary_net) {
usipx->sipx_network = ipx_primary_net->if_netnum;
intrfc = ipx_primary_net;
} else {
rt = ipxrtr_lookup(usipx->sipx_network);
rc = -ENETUNREACH;
if (!rt)
goto out;
intrfc = rt->ir_intrfc;
}
ipxitf_hold(intrfc);
ipx_offset = intrfc->if_ipx_offset;
size = sizeof(struct ipxhdr) + len + ipx_offset;
skb = sock_alloc_send_skb(sk, size, noblock, &rc);
if (!skb)
goto out_put;
skb_reserve(skb, ipx_offset);
skb->sk = sk;
/* Fill in IPX header */
skb_reset_network_header(skb);
skb_reset_transport_header(skb);
skb_put(skb, sizeof(struct ipxhdr));
ipx = ipx_hdr(skb);
ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr));
IPX_SKB_CB(skb)->ipx_tctrl = 0;
ipx->ipx_type = usipx->sipx_type;
IPX_SKB_CB(skb)->last_hop.index = -1;
#ifdef CONFIG_IPX_INTERN
IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum;
memcpy(ipx->ipx_source.node, ipxs->node, IPX_NODE_LEN);
#else
rc = ntohs(ipxs->port);
if (rc == 0x453 || rc == 0x452) {
/* RIP/SAP special handling for mars_nwe */
IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum;
memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN);
} else {
IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum;
memcpy(ipx->ipx_source.node, ipxs->intrfc->if_node,
IPX_NODE_LEN);
}
#endif /* CONFIG_IPX_INTERN */
ipx->ipx_source.sock = ipxs->port;
IPX_SKB_CB(skb)->ipx_dest_net = usipx->sipx_network;
memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN);
ipx->ipx_dest.sock = usipx->sipx_port;
rc = memcpy_fromiovec(skb_put(skb, len), iov, len);
if (rc) {
kfree_skb(skb);
goto out_put;
}
/* Apply checksum. Not allowed on 802.3 links. */
if (sk->sk_no_check || intrfc->if_dlink_type == htons(IPX_FRAME_8023))
ipx->ipx_checksum = htons(0xFFFF);
else
ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr));
rc = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ?
rt->ir_router_node : ipx->ipx_dest.node);
out_put:
ipxitf_put(intrfc);
if (rt)
ipxrtr_put(rt);
out:
return rc;
}
/*
* We use a normal struct rtentry for route handling
*/
int ipxrtr_ioctl(unsigned int cmd, void __user *arg)
{
struct rtentry rt; /* Use these to behave like 'other' stacks */
struct sockaddr_ipx *sg, *st;
int rc = -EFAULT;
if (copy_from_user(&rt, arg, sizeof(rt)))
goto out;
sg = (struct sockaddr_ipx *)&rt.rt_gateway;
st = (struct sockaddr_ipx *)&rt.rt_dst;
rc = -EINVAL;
if (!(rt.rt_flags & RTF_GATEWAY) || /* Direct routes are fixed */
sg->sipx_family != AF_IPX ||
st->sipx_family != AF_IPX)
goto out;
switch (cmd) {
case SIOCDELRT:
rc = ipxrtr_delete(st->sipx_network);
break;
case SIOCADDRT: {
struct ipx_route_definition f;
f.ipx_network = st->sipx_network;
f.ipx_router_network = sg->sipx_network;
memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN);
rc = ipxrtr_create(&f);
break;
}
}
out:
return rc;
}