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