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1 | /* |
2 | * Implements the IPX routing routines. |
3 | * Code moved from af_ipx.c. |
4 | * |
5 | * Arnaldo Carvalho de Melo <acme@conectiva.com.br>, 2003 |
6 | * |
7 | * See net/ipx/ChangeLog. |
8 | */ |
9 | |
10 | #include <linux/list.h> |
11 | #include <linux/route.h> |
12 | #include <linux/slab.h> |
13 | #include <linux/spinlock.h> |
14 | |
15 | #include <net/ipx.h> |
16 | #include <net/sock.h> |
17 | |
18 | LIST_HEAD(ipx_routes); |
19 | DEFINE_RWLOCK(ipx_routes_lock); |
20 | |
21 | extern struct ipx_interface *ipx_internal_net; |
22 | |
23 | extern __be16 ipx_cksum(struct ipxhdr *packet, int length); |
24 | extern struct ipx_interface *ipxitf_find_using_net(__be32 net); |
25 | extern int ipxitf_demux_socket(struct ipx_interface *intrfc, |
26 | struct sk_buff *skb, int copy); |
27 | extern int ipxitf_demux_socket(struct ipx_interface *intrfc, |
28 | struct sk_buff *skb, int copy); |
29 | extern int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, |
30 | char *node); |
31 | extern struct ipx_interface *ipxitf_find_using_net(__be32 net); |
32 | |
33 | struct ipx_route *ipxrtr_lookup(__be32 net) |
34 | { |
35 | struct ipx_route *r; |
36 | |
37 | read_lock_bh(&ipx_routes_lock); |
38 | list_for_each_entry(r, &ipx_routes, node) |
39 | if (r->ir_net == net) { |
40 | ipxrtr_hold(r); |
41 | goto unlock; |
42 | } |
43 | r = NULL; |
44 | unlock: |
45 | read_unlock_bh(&ipx_routes_lock); |
46 | return r; |
47 | } |
48 | |
49 | /* |
50 | * Caller must hold a reference to intrfc |
51 | */ |
52 | int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc, |
53 | unsigned char *node) |
54 | { |
55 | struct ipx_route *rt; |
56 | int rc; |
57 | |
58 | /* Get a route structure; either existing or create */ |
59 | rt = ipxrtr_lookup(network); |
60 | if (!rt) { |
61 | rt = kmalloc(sizeof(*rt), GFP_ATOMIC); |
62 | rc = -EAGAIN; |
63 | if (!rt) |
64 | goto out; |
65 | |
66 | atomic_set(&rt->refcnt, 1); |
67 | ipxrtr_hold(rt); |
68 | write_lock_bh(&ipx_routes_lock); |
69 | list_add(&rt->node, &ipx_routes); |
70 | write_unlock_bh(&ipx_routes_lock); |
71 | } else { |
72 | rc = -EEXIST; |
73 | if (intrfc == ipx_internal_net) |
74 | goto out_put; |
75 | } |
76 | |
77 | rt->ir_net = network; |
78 | rt->ir_intrfc = intrfc; |
79 | if (!node) { |
80 | memset(rt->ir_router_node, '\0', IPX_NODE_LEN); |
81 | rt->ir_routed = 0; |
82 | } else { |
83 | memcpy(rt->ir_router_node, node, IPX_NODE_LEN); |
84 | rt->ir_routed = 1; |
85 | } |
86 | |
87 | rc = 0; |
88 | out_put: |
89 | ipxrtr_put(rt); |
90 | out: |
91 | return rc; |
92 | } |
93 | |
94 | void ipxrtr_del_routes(struct ipx_interface *intrfc) |
95 | { |
96 | struct ipx_route *r, *tmp; |
97 | |
98 | write_lock_bh(&ipx_routes_lock); |
99 | list_for_each_entry_safe(r, tmp, &ipx_routes, node) |
100 | if (r->ir_intrfc == intrfc) { |
101 | list_del(&r->node); |
102 | ipxrtr_put(r); |
103 | } |
104 | write_unlock_bh(&ipx_routes_lock); |
105 | } |
106 | |
107 | static int ipxrtr_create(struct ipx_route_definition *rd) |
108 | { |
109 | struct ipx_interface *intrfc; |
110 | int rc = -ENETUNREACH; |
111 | |
112 | /* Find the appropriate interface */ |
113 | intrfc = ipxitf_find_using_net(rd->ipx_router_network); |
114 | if (!intrfc) |
115 | goto out; |
116 | rc = ipxrtr_add_route(rd->ipx_network, intrfc, rd->ipx_router_node); |
117 | ipxitf_put(intrfc); |
118 | out: |
119 | return rc; |
120 | } |
121 | |
122 | static int ipxrtr_delete(__be32 net) |
123 | { |
124 | struct ipx_route *r, *tmp; |
125 | int rc; |
126 | |
127 | write_lock_bh(&ipx_routes_lock); |
128 | list_for_each_entry_safe(r, tmp, &ipx_routes, node) |
129 | if (r->ir_net == net) { |
130 | /* Directly connected; can't lose route */ |
131 | rc = -EPERM; |
132 | if (!r->ir_routed) |
133 | goto out; |
134 | list_del(&r->node); |
135 | ipxrtr_put(r); |
136 | rc = 0; |
137 | goto out; |
138 | } |
139 | rc = -ENOENT; |
140 | out: |
141 | write_unlock_bh(&ipx_routes_lock); |
142 | return rc; |
143 | } |
144 | |
145 | /* |
146 | * The skb has to be unshared, we'll end up calling ipxitf_send, that'll |
147 | * modify the packet |
148 | */ |
149 | int ipxrtr_route_skb(struct sk_buff *skb) |
150 | { |
151 | struct ipxhdr *ipx = ipx_hdr(skb); |
152 | struct ipx_route *r = ipxrtr_lookup(IPX_SKB_CB(skb)->ipx_dest_net); |
153 | |
154 | if (!r) { /* no known route */ |
155 | kfree_skb(skb); |
156 | return 0; |
157 | } |
158 | |
159 | ipxitf_hold(r->ir_intrfc); |
160 | ipxitf_send(r->ir_intrfc, skb, r->ir_routed ? |
161 | r->ir_router_node : ipx->ipx_dest.node); |
162 | ipxitf_put(r->ir_intrfc); |
163 | ipxrtr_put(r); |
164 | |
165 | return 0; |
166 | } |
167 | |
168 | /* |
169 | * Route an outgoing frame from a socket. |
170 | */ |
171 | int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx, |
172 | struct iovec *iov, size_t len, int noblock) |
173 | { |
174 | struct sk_buff *skb; |
175 | struct ipx_sock *ipxs = ipx_sk(sk); |
176 | struct ipx_interface *intrfc; |
177 | struct ipxhdr *ipx; |
178 | size_t size; |
179 | int ipx_offset; |
180 | struct ipx_route *rt = NULL; |
181 | int rc; |
182 | |
183 | /* Find the appropriate interface on which to send packet */ |
184 | if (!usipx->sipx_network && ipx_primary_net) { |
185 | usipx->sipx_network = ipx_primary_net->if_netnum; |
186 | intrfc = ipx_primary_net; |
187 | } else { |
188 | rt = ipxrtr_lookup(usipx->sipx_network); |
189 | rc = -ENETUNREACH; |
190 | if (!rt) |
191 | goto out; |
192 | intrfc = rt->ir_intrfc; |
193 | } |
194 | |
195 | ipxitf_hold(intrfc); |
196 | ipx_offset = intrfc->if_ipx_offset; |
197 | size = sizeof(struct ipxhdr) + len + ipx_offset; |
198 | |
199 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); |
200 | if (!skb) |
201 | goto out_put; |
202 | |
203 | skb_reserve(skb, ipx_offset); |
204 | skb->sk = sk; |
205 | |
206 | /* Fill in IPX header */ |
207 | skb_reset_network_header(skb); |
208 | skb_reset_transport_header(skb); |
209 | skb_put(skb, sizeof(struct ipxhdr)); |
210 | ipx = ipx_hdr(skb); |
211 | ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr)); |
212 | IPX_SKB_CB(skb)->ipx_tctrl = 0; |
213 | ipx->ipx_type = usipx->sipx_type; |
214 | |
215 | IPX_SKB_CB(skb)->last_hop.index = -1; |
216 | #ifdef CONFIG_IPX_INTERN |
217 | IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum; |
218 | memcpy(ipx->ipx_source.node, ipxs->node, IPX_NODE_LEN); |
219 | #else |
220 | rc = ntohs(ipxs->port); |
221 | if (rc == 0x453 || rc == 0x452) { |
222 | /* RIP/SAP special handling for mars_nwe */ |
223 | IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum; |
224 | memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN); |
225 | } else { |
226 | IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum; |
227 | memcpy(ipx->ipx_source.node, ipxs->intrfc->if_node, |
228 | IPX_NODE_LEN); |
229 | } |
230 | #endif /* CONFIG_IPX_INTERN */ |
231 | ipx->ipx_source.sock = ipxs->port; |
232 | IPX_SKB_CB(skb)->ipx_dest_net = usipx->sipx_network; |
233 | memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN); |
234 | ipx->ipx_dest.sock = usipx->sipx_port; |
235 | |
236 | rc = memcpy_fromiovec(skb_put(skb, len), iov, len); |
237 | if (rc) { |
238 | kfree_skb(skb); |
239 | goto out_put; |
240 | } |
241 | |
242 | /* Apply checksum. Not allowed on 802.3 links. */ |
243 | if (sk->sk_no_check || intrfc->if_dlink_type == htons(IPX_FRAME_8023)) |
244 | ipx->ipx_checksum = htons(0xFFFF); |
245 | else |
246 | ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr)); |
247 | |
248 | rc = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ? |
249 | rt->ir_router_node : ipx->ipx_dest.node); |
250 | out_put: |
251 | ipxitf_put(intrfc); |
252 | if (rt) |
253 | ipxrtr_put(rt); |
254 | out: |
255 | return rc; |
256 | } |
257 | |
258 | /* |
259 | * We use a normal struct rtentry for route handling |
260 | */ |
261 | int ipxrtr_ioctl(unsigned int cmd, void __user *arg) |
262 | { |
263 | struct rtentry rt; /* Use these to behave like 'other' stacks */ |
264 | struct sockaddr_ipx *sg, *st; |
265 | int rc = -EFAULT; |
266 | |
267 | if (copy_from_user(&rt, arg, sizeof(rt))) |
268 | goto out; |
269 | |
270 | sg = (struct sockaddr_ipx *)&rt.rt_gateway; |
271 | st = (struct sockaddr_ipx *)&rt.rt_dst; |
272 | |
273 | rc = -EINVAL; |
274 | if (!(rt.rt_flags & RTF_GATEWAY) || /* Direct routes are fixed */ |
275 | sg->sipx_family != AF_IPX || |
276 | st->sipx_family != AF_IPX) |
277 | goto out; |
278 | |
279 | switch (cmd) { |
280 | case SIOCDELRT: |
281 | rc = ipxrtr_delete(st->sipx_network); |
282 | break; |
283 | case SIOCADDRT: { |
284 | struct ipx_route_definition f; |
285 | f.ipx_network = st->sipx_network; |
286 | f.ipx_router_network = sg->sipx_network; |
287 | memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN); |
288 | rc = ipxrtr_create(&f); |
289 | break; |
290 | } |
291 | } |
292 | |
293 | out: |
294 | return rc; |
295 | } |
296 |
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