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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipx/ipx_route.c
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz
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 'net/ipx/ipx_route.c')
-rw-r--r--net/ipx/ipx_route.c293
1 files changed, 293 insertions, 0 deletions
diff --git a/net/ipx/ipx_route.c b/net/ipx/ipx_route.c
new file mode 100644
index 00000000000..67774448efd
--- /dev/null
+++ b/net/ipx/ipx_route.c
@@ -0,0 +1,293 @@
+/*
+ * 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/config.h>
+#include <linux/list.h>
+#include <linux/route.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 __u16 ipx_cksum(struct ipxhdr *packet, int length);
+extern struct ipx_interface *ipxitf_find_using_net(__u32 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(__u32 net);
+
+struct ipx_route *ipxrtr_lookup(__u32 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(__u32 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(long 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->h.raw = skb->nh.raw = 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 == IPX_FRAME_8023)
+ ipx->ipx_checksum = 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;
+}