Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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/config.h> |
| 11 | #include <linux/list.h> |
| 12 | #include <linux/route.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 __u16 ipx_cksum(struct ipxhdr *packet, int length); |
| 24 | extern struct ipx_interface *ipxitf_find_using_net(__u32 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(__u32 net); |
| 32 | |
| 33 | struct ipx_route *ipxrtr_lookup(__u32 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(__u32 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 | |
Alexey Dobriyan | 53d42f5 | 2006-05-16 15:07:28 -0700 | [diff] [blame] | 122 | static int ipxrtr_delete(__u32 net) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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->h.raw = skb->nh.raw = skb_put(skb, sizeof(struct ipxhdr)); |
| 208 | ipx = ipx_hdr(skb); |
| 209 | ipx->ipx_pktsize = htons(len + sizeof(struct ipxhdr)); |
| 210 | IPX_SKB_CB(skb)->ipx_tctrl = 0; |
| 211 | ipx->ipx_type = usipx->sipx_type; |
| 212 | |
| 213 | IPX_SKB_CB(skb)->last_hop.index = -1; |
| 214 | #ifdef CONFIG_IPX_INTERN |
| 215 | IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum; |
| 216 | memcpy(ipx->ipx_source.node, ipxs->node, IPX_NODE_LEN); |
| 217 | #else |
| 218 | rc = ntohs(ipxs->port); |
| 219 | if (rc == 0x453 || rc == 0x452) { |
| 220 | /* RIP/SAP special handling for mars_nwe */ |
| 221 | IPX_SKB_CB(skb)->ipx_source_net = intrfc->if_netnum; |
| 222 | memcpy(ipx->ipx_source.node, intrfc->if_node, IPX_NODE_LEN); |
| 223 | } else { |
| 224 | IPX_SKB_CB(skb)->ipx_source_net = ipxs->intrfc->if_netnum; |
| 225 | memcpy(ipx->ipx_source.node, ipxs->intrfc->if_node, |
| 226 | IPX_NODE_LEN); |
| 227 | } |
| 228 | #endif /* CONFIG_IPX_INTERN */ |
| 229 | ipx->ipx_source.sock = ipxs->port; |
| 230 | IPX_SKB_CB(skb)->ipx_dest_net = usipx->sipx_network; |
| 231 | memcpy(ipx->ipx_dest.node, usipx->sipx_node, IPX_NODE_LEN); |
| 232 | ipx->ipx_dest.sock = usipx->sipx_port; |
| 233 | |
| 234 | rc = memcpy_fromiovec(skb_put(skb, len), iov, len); |
| 235 | if (rc) { |
| 236 | kfree_skb(skb); |
| 237 | goto out_put; |
| 238 | } |
| 239 | |
| 240 | /* Apply checksum. Not allowed on 802.3 links. */ |
| 241 | if (sk->sk_no_check || intrfc->if_dlink_type == IPX_FRAME_8023) |
| 242 | ipx->ipx_checksum = 0xFFFF; |
| 243 | else |
| 244 | ipx->ipx_checksum = ipx_cksum(ipx, len + sizeof(struct ipxhdr)); |
| 245 | |
| 246 | rc = ipxitf_send(intrfc, skb, (rt && rt->ir_routed) ? |
| 247 | rt->ir_router_node : ipx->ipx_dest.node); |
| 248 | out_put: |
| 249 | ipxitf_put(intrfc); |
| 250 | if (rt) |
| 251 | ipxrtr_put(rt); |
| 252 | out: |
| 253 | return rc; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * We use a normal struct rtentry for route handling |
| 258 | */ |
| 259 | int ipxrtr_ioctl(unsigned int cmd, void __user *arg) |
| 260 | { |
| 261 | struct rtentry rt; /* Use these to behave like 'other' stacks */ |
| 262 | struct sockaddr_ipx *sg, *st; |
| 263 | int rc = -EFAULT; |
| 264 | |
| 265 | if (copy_from_user(&rt, arg, sizeof(rt))) |
| 266 | goto out; |
| 267 | |
| 268 | sg = (struct sockaddr_ipx *)&rt.rt_gateway; |
| 269 | st = (struct sockaddr_ipx *)&rt.rt_dst; |
| 270 | |
| 271 | rc = -EINVAL; |
| 272 | if (!(rt.rt_flags & RTF_GATEWAY) || /* Direct routes are fixed */ |
| 273 | sg->sipx_family != AF_IPX || |
| 274 | st->sipx_family != AF_IPX) |
| 275 | goto out; |
| 276 | |
| 277 | switch (cmd) { |
| 278 | case SIOCDELRT: |
| 279 | rc = ipxrtr_delete(st->sipx_network); |
| 280 | break; |
| 281 | case SIOCADDRT: { |
| 282 | struct ipx_route_definition f; |
| 283 | f.ipx_network = st->sipx_network; |
| 284 | f.ipx_router_network = sg->sipx_network; |
| 285 | memcpy(f.ipx_router_node, sg->sipx_node, IPX_NODE_LEN); |
| 286 | rc = ipxrtr_create(&f); |
| 287 | break; |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | out: |
| 292 | return rc; |
| 293 | } |