Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | ||
1da177e4 LT |
10 | #include <linux/list.h> |
11 | #include <linux/route.h> | |
12 | #include <linux/spinlock.h> | |
13 | ||
14 | #include <net/ipx.h> | |
15 | #include <net/sock.h> | |
16 | ||
17 | LIST_HEAD(ipx_routes); | |
18 | DEFINE_RWLOCK(ipx_routes_lock); | |
19 | ||
20 | extern struct ipx_interface *ipx_internal_net; | |
21 | ||
02e60370 | 22 | extern __be16 ipx_cksum(struct ipxhdr *packet, int length); |
4833ed09 | 23 | extern struct ipx_interface *ipxitf_find_using_net(__be32 net); |
1da177e4 LT |
24 | extern int ipxitf_demux_socket(struct ipx_interface *intrfc, |
25 | struct sk_buff *skb, int copy); | |
26 | extern int ipxitf_demux_socket(struct ipx_interface *intrfc, | |
27 | struct sk_buff *skb, int copy); | |
28 | extern int ipxitf_send(struct ipx_interface *intrfc, struct sk_buff *skb, | |
29 | char *node); | |
4833ed09 | 30 | extern struct ipx_interface *ipxitf_find_using_net(__be32 net); |
1da177e4 | 31 | |
4833ed09 | 32 | struct ipx_route *ipxrtr_lookup(__be32 net) |
1da177e4 LT |
33 | { |
34 | struct ipx_route *r; | |
35 | ||
36 | read_lock_bh(&ipx_routes_lock); | |
37 | list_for_each_entry(r, &ipx_routes, node) | |
38 | if (r->ir_net == net) { | |
39 | ipxrtr_hold(r); | |
40 | goto unlock; | |
41 | } | |
42 | r = NULL; | |
43 | unlock: | |
44 | read_unlock_bh(&ipx_routes_lock); | |
45 | return r; | |
46 | } | |
47 | ||
48 | /* | |
49 | * Caller must hold a reference to intrfc | |
50 | */ | |
4833ed09 | 51 | int ipxrtr_add_route(__be32 network, struct ipx_interface *intrfc, |
1da177e4 LT |
52 | unsigned char *node) |
53 | { | |
54 | struct ipx_route *rt; | |
55 | int rc; | |
56 | ||
57 | /* Get a route structure; either existing or create */ | |
58 | rt = ipxrtr_lookup(network); | |
59 | if (!rt) { | |
60 | rt = kmalloc(sizeof(*rt), GFP_ATOMIC); | |
61 | rc = -EAGAIN; | |
62 | if (!rt) | |
63 | goto out; | |
64 | ||
65 | atomic_set(&rt->refcnt, 1); | |
66 | ipxrtr_hold(rt); | |
67 | write_lock_bh(&ipx_routes_lock); | |
68 | list_add(&rt->node, &ipx_routes); | |
69 | write_unlock_bh(&ipx_routes_lock); | |
70 | } else { | |
71 | rc = -EEXIST; | |
72 | if (intrfc == ipx_internal_net) | |
73 | goto out_put; | |
74 | } | |
75 | ||
76 | rt->ir_net = network; | |
77 | rt->ir_intrfc = intrfc; | |
78 | if (!node) { | |
79 | memset(rt->ir_router_node, '\0', IPX_NODE_LEN); | |
80 | rt->ir_routed = 0; | |
81 | } else { | |
82 | memcpy(rt->ir_router_node, node, IPX_NODE_LEN); | |
83 | rt->ir_routed = 1; | |
84 | } | |
85 | ||
86 | rc = 0; | |
87 | out_put: | |
88 | ipxrtr_put(rt); | |
89 | out: | |
90 | return rc; | |
91 | } | |
92 | ||
93 | void ipxrtr_del_routes(struct ipx_interface *intrfc) | |
94 | { | |
95 | struct ipx_route *r, *tmp; | |
96 | ||
97 | write_lock_bh(&ipx_routes_lock); | |
98 | list_for_each_entry_safe(r, tmp, &ipx_routes, node) | |
99 | if (r->ir_intrfc == intrfc) { | |
100 | list_del(&r->node); | |
101 | ipxrtr_put(r); | |
102 | } | |
103 | write_unlock_bh(&ipx_routes_lock); | |
104 | } | |
105 | ||
106 | static int ipxrtr_create(struct ipx_route_definition *rd) | |
107 | { | |
108 | struct ipx_interface *intrfc; | |
109 | int rc = -ENETUNREACH; | |
110 | ||
111 | /* Find the appropriate interface */ | |
112 | intrfc = ipxitf_find_using_net(rd->ipx_router_network); | |
113 | if (!intrfc) | |
114 | goto out; | |
115 | rc = ipxrtr_add_route(rd->ipx_network, intrfc, rd->ipx_router_node); | |
116 | ipxitf_put(intrfc); | |
117 | out: | |
118 | return rc; | |
119 | } | |
120 | ||
4833ed09 | 121 | static int ipxrtr_delete(__be32 net) |
1da177e4 LT |
122 | { |
123 | struct ipx_route *r, *tmp; | |
124 | int rc; | |
125 | ||
126 | write_lock_bh(&ipx_routes_lock); | |
127 | list_for_each_entry_safe(r, tmp, &ipx_routes, node) | |
128 | if (r->ir_net == net) { | |
129 | /* Directly connected; can't lose route */ | |
130 | rc = -EPERM; | |
131 | if (!r->ir_routed) | |
132 | goto out; | |
133 | list_del(&r->node); | |
134 | ipxrtr_put(r); | |
135 | rc = 0; | |
136 | goto out; | |
137 | } | |
138 | rc = -ENOENT; | |
139 | out: | |
140 | write_unlock_bh(&ipx_routes_lock); | |
141 | return rc; | |
142 | } | |
143 | ||
144 | /* | |
145 | * The skb has to be unshared, we'll end up calling ipxitf_send, that'll | |
146 | * modify the packet | |
147 | */ | |
148 | int ipxrtr_route_skb(struct sk_buff *skb) | |
149 | { | |
150 | struct ipxhdr *ipx = ipx_hdr(skb); | |
151 | struct ipx_route *r = ipxrtr_lookup(IPX_SKB_CB(skb)->ipx_dest_net); | |
152 | ||
153 | if (!r) { /* no known route */ | |
154 | kfree_skb(skb); | |
155 | return 0; | |
156 | } | |
157 | ||
158 | ipxitf_hold(r->ir_intrfc); | |
159 | ipxitf_send(r->ir_intrfc, skb, r->ir_routed ? | |
160 | r->ir_router_node : ipx->ipx_dest.node); | |
161 | ipxitf_put(r->ir_intrfc); | |
162 | ipxrtr_put(r); | |
163 | ||
164 | return 0; | |
165 | } | |
166 | ||
167 | /* | |
168 | * Route an outgoing frame from a socket. | |
169 | */ | |
170 | int ipxrtr_route_packet(struct sock *sk, struct sockaddr_ipx *usipx, | |
171 | struct iovec *iov, size_t len, int noblock) | |
172 | { | |
173 | struct sk_buff *skb; | |
174 | struct ipx_sock *ipxs = ipx_sk(sk); | |
175 | struct ipx_interface *intrfc; | |
176 | struct ipxhdr *ipx; | |
177 | size_t size; | |
178 | int ipx_offset; | |
179 | struct ipx_route *rt = NULL; | |
180 | int rc; | |
181 | ||
182 | /* Find the appropriate interface on which to send packet */ | |
183 | if (!usipx->sipx_network && ipx_primary_net) { | |
184 | usipx->sipx_network = ipx_primary_net->if_netnum; | |
185 | intrfc = ipx_primary_net; | |
186 | } else { | |
187 | rt = ipxrtr_lookup(usipx->sipx_network); | |
188 | rc = -ENETUNREACH; | |
189 | if (!rt) | |
190 | goto out; | |
191 | intrfc = rt->ir_intrfc; | |
192 | } | |
193 | ||
194 | ipxitf_hold(intrfc); | |
195 | ipx_offset = intrfc->if_ipx_offset; | |
196 | size = sizeof(struct ipxhdr) + len + ipx_offset; | |
197 | ||
198 | skb = sock_alloc_send_skb(sk, size, noblock, &rc); | |
199 | if (!skb) | |
200 | goto out_put; | |
201 | ||
202 | skb_reserve(skb, ipx_offset); | |
203 | skb->sk = sk; | |
204 | ||
205 | /* Fill in IPX header */ | |
7e28ecc2 ACM |
206 | skb_reset_network_header(skb); |
207 | skb->h.raw = skb->data; | |
208 | skb_put(skb, sizeof(struct ipxhdr)); | |
1da177e4 LT |
209 | ipx = ipx_hdr(skb); |
210 | ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr)); | |
211 | IPX_SKB_CB(skb)->ipx_tctrl = 0; | |
212 | ipx->ipx_type = usipx->sipx_type; | |
213 | ||
214 | IPX_SKB_CB(skb)->last_hop.index = -1; | |
215 | #ifdef CONFIG_IPX_INTERN | |
216 | IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum; | |
217 | memcpy(ipx->ipx_source.node, ipxs->node, IPX_NODE_LEN); | |
218 | #else | |
219 | rc = ntohs(ipxs->port); | |
220 | if (rc == 0x453 || rc == 0x452) { | |
221 | /* RIP/SAP special handling for mars_nwe */ | |
222 | IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum; | |
223 | memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN); | |
224 | } else { | |
225 | IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum; | |
226 | memcpy(ipx->ipx_source.node, ipxs->intrfc->if_node, | |
227 | IPX_NODE_LEN); | |
228 | } | |
229 | #endif /* CONFIG_IPX_INTERN */ | |
230 | ipx->ipx_source.sock = ipxs->port; | |
231 | IPX_SKB_CB(skb)->ipx_dest_net = usipx->sipx_network; | |
232 | memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN); | |
233 | ipx->ipx_dest.sock = usipx->sipx_port; | |
234 | ||
235 | rc = memcpy_fromiovec(skb_put(skb, len), iov, len); | |
236 | if (rc) { | |
237 | kfree_skb(skb); | |
238 | goto out_put; | |
981c0ff6 | 239 | } |
1da177e4 LT |
240 | |
241 | /* Apply checksum. Not allowed on 802.3 links. */ | |
f8d59621 | 242 | if (sk->sk_no_check || intrfc->if_dlink_type == htons(IPX_FRAME_8023)) |
02e60370 | 243 | ipx->ipx_checksum = htons(0xFFFF); |
1da177e4 LT |
244 | else |
245 | ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr)); | |
246 | ||
981c0ff6 | 247 | rc = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ? |
1da177e4 LT |
248 | rt->ir_router_node : ipx->ipx_dest.node); |
249 | out_put: | |
250 | ipxitf_put(intrfc); | |
251 | if (rt) | |
252 | ipxrtr_put(rt); | |
253 | out: | |
254 | return rc; | |
255 | } | |
256 | ||
257 | /* | |
258 | * We use a normal struct rtentry for route handling | |
259 | */ | |
260 | int ipxrtr_ioctl(unsigned int cmd, void __user *arg) | |
261 | { | |
262 | struct rtentry rt; /* Use these to behave like 'other' stacks */ | |
263 | struct sockaddr_ipx *sg, *st; | |
264 | int rc = -EFAULT; | |
265 | ||
266 | if (copy_from_user(&rt, arg, sizeof(rt))) | |
267 | goto out; | |
268 | ||
269 | sg = (struct sockaddr_ipx *)&rt.rt_gateway; | |
270 | st = (struct sockaddr_ipx *)&rt.rt_dst; | |
271 | ||
272 | rc = -EINVAL; | |
273 | if (!(rt.rt_flags & RTF_GATEWAY) || /* Direct routes are fixed */ | |
274 | sg->sipx_family != AF_IPX || | |
275 | st->sipx_family != AF_IPX) | |
276 | goto out; | |
277 | ||
278 | switch (cmd) { | |
279 | case SIOCDELRT: | |
280 | rc = ipxrtr_delete(st->sipx_network); | |
281 | break; | |
282 | case SIOCADDRT: { | |
283 | struct ipx_route_definition f; | |
284 | f.ipx_network = st->sipx_network; | |
285 | f.ipx_router_network = sg->sipx_network; | |
286 | memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN); | |
287 | rc = ipxrtr_create(&f); | |
288 | break; | |
289 | } | |
290 | } | |
291 | ||
292 | out: | |
293 | return rc; | |
294 | } |