14b07b3f6SRemi Denis-Courmont /* 24b07b3f6SRemi Denis-Courmont * File: af_phonet.c 34b07b3f6SRemi Denis-Courmont * 44b07b3f6SRemi Denis-Courmont * Phonet protocols family 54b07b3f6SRemi Denis-Courmont * 64b07b3f6SRemi Denis-Courmont * Copyright (C) 2008 Nokia Corporation. 74b07b3f6SRemi Denis-Courmont * 84b07b3f6SRemi Denis-Courmont * Contact: Remi Denis-Courmont <remi.denis-courmont@nokia.com> 94b07b3f6SRemi Denis-Courmont * Original author: Sakari Ailus <sakari.ailus@nokia.com> 104b07b3f6SRemi Denis-Courmont * 114b07b3f6SRemi Denis-Courmont * This program is free software; you can redistribute it and/or 124b07b3f6SRemi Denis-Courmont * modify it under the terms of the GNU General Public License 134b07b3f6SRemi Denis-Courmont * version 2 as published by the Free Software Foundation. 144b07b3f6SRemi Denis-Courmont * 154b07b3f6SRemi Denis-Courmont * This program is distributed in the hope that it will be useful, but 164b07b3f6SRemi Denis-Courmont * WITHOUT ANY WARRANTY; without even the implied warranty of 174b07b3f6SRemi Denis-Courmont * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 184b07b3f6SRemi Denis-Courmont * General Public License for more details. 194b07b3f6SRemi Denis-Courmont * 204b07b3f6SRemi Denis-Courmont * You should have received a copy of the GNU General Public License 214b07b3f6SRemi Denis-Courmont * along with this program; if not, write to the Free Software 224b07b3f6SRemi Denis-Courmont * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 234b07b3f6SRemi Denis-Courmont * 02110-1301 USA 244b07b3f6SRemi Denis-Courmont */ 254b07b3f6SRemi Denis-Courmont 264b07b3f6SRemi Denis-Courmont #include <linux/kernel.h> 274b07b3f6SRemi Denis-Courmont #include <linux/module.h> 284b07b3f6SRemi Denis-Courmont #include <asm/unaligned.h> 294b07b3f6SRemi Denis-Courmont #include <net/sock.h> 304b07b3f6SRemi Denis-Courmont 314b07b3f6SRemi Denis-Courmont #include <linux/if_phonet.h> 324b07b3f6SRemi Denis-Courmont #include <linux/phonet.h> 334b07b3f6SRemi Denis-Courmont #include <net/phonet/phonet.h> 34f8ff6028SRemi Denis-Courmont #include <net/phonet/pn_dev.h> 354b07b3f6SRemi Denis-Courmont 36566521d6SAlexey Dobriyan /* Transport protocol registration */ 37566521d6SAlexey Dobriyan static struct phonet_protocol *proto_tab[PHONET_NPROTO] __read_mostly; 38566521d6SAlexey Dobriyan static DEFINE_SPINLOCK(proto_tab_lock); 39566521d6SAlexey Dobriyan 40566521d6SAlexey Dobriyan static struct phonet_protocol *phonet_proto_get(int protocol) 41566521d6SAlexey Dobriyan { 42566521d6SAlexey Dobriyan struct phonet_protocol *pp; 43566521d6SAlexey Dobriyan 44566521d6SAlexey Dobriyan if (protocol >= PHONET_NPROTO) 45566521d6SAlexey Dobriyan return NULL; 46566521d6SAlexey Dobriyan 47566521d6SAlexey Dobriyan spin_lock(&proto_tab_lock); 48566521d6SAlexey Dobriyan pp = proto_tab[protocol]; 49566521d6SAlexey Dobriyan if (pp && !try_module_get(pp->prot->owner)) 50566521d6SAlexey Dobriyan pp = NULL; 51566521d6SAlexey Dobriyan spin_unlock(&proto_tab_lock); 52566521d6SAlexey Dobriyan 53566521d6SAlexey Dobriyan return pp; 54566521d6SAlexey Dobriyan } 55566521d6SAlexey Dobriyan 56566521d6SAlexey Dobriyan static inline void phonet_proto_put(struct phonet_protocol *pp) 57566521d6SAlexey Dobriyan { 58566521d6SAlexey Dobriyan module_put(pp->prot->owner); 59566521d6SAlexey Dobriyan } 604b07b3f6SRemi Denis-Courmont 614b07b3f6SRemi Denis-Courmont /* protocol family functions */ 624b07b3f6SRemi Denis-Courmont 634b07b3f6SRemi Denis-Courmont static int pn_socket_create(struct net *net, struct socket *sock, int protocol) 644b07b3f6SRemi Denis-Courmont { 65ba113a94SRemi Denis-Courmont struct sock *sk; 66ba113a94SRemi Denis-Courmont struct pn_sock *pn; 674b07b3f6SRemi Denis-Courmont struct phonet_protocol *pnp; 684b07b3f6SRemi Denis-Courmont int err; 694b07b3f6SRemi Denis-Courmont 704b07b3f6SRemi Denis-Courmont if (!capable(CAP_SYS_ADMIN)) 714b07b3f6SRemi Denis-Courmont return -EPERM; 724b07b3f6SRemi Denis-Courmont 734b07b3f6SRemi Denis-Courmont if (protocol == 0) { 744b07b3f6SRemi Denis-Courmont /* Default protocol selection */ 754b07b3f6SRemi Denis-Courmont switch (sock->type) { 764b07b3f6SRemi Denis-Courmont case SOCK_DGRAM: 774b07b3f6SRemi Denis-Courmont protocol = PN_PROTO_PHONET; 784b07b3f6SRemi Denis-Courmont break; 799641458dSRémi Denis-Courmont case SOCK_SEQPACKET: 809641458dSRémi Denis-Courmont protocol = PN_PROTO_PIPE; 819641458dSRémi Denis-Courmont break; 824b07b3f6SRemi Denis-Courmont default: 834b07b3f6SRemi Denis-Courmont return -EPROTONOSUPPORT; 844b07b3f6SRemi Denis-Courmont } 854b07b3f6SRemi Denis-Courmont } 864b07b3f6SRemi Denis-Courmont 874b07b3f6SRemi Denis-Courmont pnp = phonet_proto_get(protocol); 8825532824SRémi Denis-Courmont if (pnp == NULL && 8925532824SRémi Denis-Courmont request_module("net-pf-%d-proto-%d", PF_PHONET, protocol) == 0) 9025532824SRémi Denis-Courmont pnp = phonet_proto_get(protocol); 9195a5afcaSJohannes Berg 924b07b3f6SRemi Denis-Courmont if (pnp == NULL) 934b07b3f6SRemi Denis-Courmont return -EPROTONOSUPPORT; 944b07b3f6SRemi Denis-Courmont if (sock->type != pnp->sock_type) { 954b07b3f6SRemi Denis-Courmont err = -EPROTONOSUPPORT; 964b07b3f6SRemi Denis-Courmont goto out; 974b07b3f6SRemi Denis-Courmont } 984b07b3f6SRemi Denis-Courmont 99ba113a94SRemi Denis-Courmont sk = sk_alloc(net, PF_PHONET, GFP_KERNEL, pnp->prot); 100ba113a94SRemi Denis-Courmont if (sk == NULL) { 101ba113a94SRemi Denis-Courmont err = -ENOMEM; 102ba113a94SRemi Denis-Courmont goto out; 103ba113a94SRemi Denis-Courmont } 104ba113a94SRemi Denis-Courmont 105ba113a94SRemi Denis-Courmont sock_init_data(sock, sk); 106ba113a94SRemi Denis-Courmont sock->state = SS_UNCONNECTED; 107ba113a94SRemi Denis-Courmont sock->ops = pnp->ops; 108ba113a94SRemi Denis-Courmont sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; 109ba113a94SRemi Denis-Courmont sk->sk_protocol = protocol; 110ba113a94SRemi Denis-Courmont pn = pn_sk(sk); 111ba113a94SRemi Denis-Courmont pn->sobject = 0; 112ba113a94SRemi Denis-Courmont pn->resource = 0; 113ba113a94SRemi Denis-Courmont sk->sk_prot->init(sk); 114ba113a94SRemi Denis-Courmont err = 0; 1154b07b3f6SRemi Denis-Courmont 1164b07b3f6SRemi Denis-Courmont out: 1174b07b3f6SRemi Denis-Courmont phonet_proto_put(pnp); 1184b07b3f6SRemi Denis-Courmont return err; 1194b07b3f6SRemi Denis-Courmont } 1204b07b3f6SRemi Denis-Courmont 1214b07b3f6SRemi Denis-Courmont static struct net_proto_family phonet_proto_family = { 12225532824SRémi Denis-Courmont .family = PF_PHONET, 1234b07b3f6SRemi Denis-Courmont .create = pn_socket_create, 1244b07b3f6SRemi Denis-Courmont .owner = THIS_MODULE, 1254b07b3f6SRemi Denis-Courmont }; 1264b07b3f6SRemi Denis-Courmont 1275f77076dSRemi Denis-Courmont /* Phonet device header operations */ 1285f77076dSRemi Denis-Courmont static int pn_header_create(struct sk_buff *skb, struct net_device *dev, 1295f77076dSRemi Denis-Courmont unsigned short type, const void *daddr, 1305f77076dSRemi Denis-Courmont const void *saddr, unsigned len) 1315f77076dSRemi Denis-Courmont { 1325f77076dSRemi Denis-Courmont u8 *media = skb_push(skb, 1); 1335f77076dSRemi Denis-Courmont 1345f77076dSRemi Denis-Courmont if (type != ETH_P_PHONET) 1355f77076dSRemi Denis-Courmont return -1; 1365f77076dSRemi Denis-Courmont 1375f77076dSRemi Denis-Courmont if (!saddr) 1385f77076dSRemi Denis-Courmont saddr = dev->dev_addr; 1395f77076dSRemi Denis-Courmont *media = *(const u8 *)saddr; 1405f77076dSRemi Denis-Courmont return 1; 1415f77076dSRemi Denis-Courmont } 1425f77076dSRemi Denis-Courmont 1435f77076dSRemi Denis-Courmont static int pn_header_parse(const struct sk_buff *skb, unsigned char *haddr) 1445f77076dSRemi Denis-Courmont { 1455f77076dSRemi Denis-Courmont const u8 *media = skb_mac_header(skb); 1465f77076dSRemi Denis-Courmont *haddr = *media; 1475f77076dSRemi Denis-Courmont return 1; 1485f77076dSRemi Denis-Courmont } 1495f77076dSRemi Denis-Courmont 1505f77076dSRemi Denis-Courmont struct header_ops phonet_header_ops = { 1515f77076dSRemi Denis-Courmont .create = pn_header_create, 1525f77076dSRemi Denis-Courmont .parse = pn_header_parse, 1535f77076dSRemi Denis-Courmont }; 1545f77076dSRemi Denis-Courmont EXPORT_SYMBOL(phonet_header_ops); 1555f77076dSRemi Denis-Courmont 156107d0d9bSRemi Denis-Courmont /* 157107d0d9bSRemi Denis-Courmont * Prepends an ISI header and sends a datagram. 158107d0d9bSRemi Denis-Courmont */ 159107d0d9bSRemi Denis-Courmont static int pn_send(struct sk_buff *skb, struct net_device *dev, 160be0c52bfSRemi Denis-Courmont u16 dst, u16 src, u8 res, u8 irq) 161107d0d9bSRemi Denis-Courmont { 162107d0d9bSRemi Denis-Courmont struct phonethdr *ph; 163107d0d9bSRemi Denis-Courmont int err; 164107d0d9bSRemi Denis-Courmont 165ebfe92caSRémi Denis-Courmont if (skb->len + 2 > 0xffff /* Phonet length field limit */ || 166ebfe92caSRémi Denis-Courmont skb->len + sizeof(struct phonethdr) > dev->mtu) { 167107d0d9bSRemi Denis-Courmont err = -EMSGSIZE; 168107d0d9bSRemi Denis-Courmont goto drop; 169107d0d9bSRemi Denis-Courmont } 170107d0d9bSRemi Denis-Courmont 17118a1166dSRémi Denis-Courmont /* Broadcast sending is not implemented */ 17218a1166dSRémi Denis-Courmont if (pn_addr(dst) == PNADDR_BROADCAST) { 17318a1166dSRémi Denis-Courmont err = -EOPNOTSUPP; 17418a1166dSRémi Denis-Courmont goto drop; 17518a1166dSRémi Denis-Courmont } 17618a1166dSRémi Denis-Courmont 177107d0d9bSRemi Denis-Courmont skb_reset_transport_header(skb); 178107d0d9bSRemi Denis-Courmont WARN_ON(skb_headroom(skb) & 1); /* HW assumes word alignment */ 179107d0d9bSRemi Denis-Courmont skb_push(skb, sizeof(struct phonethdr)); 180107d0d9bSRemi Denis-Courmont skb_reset_network_header(skb); 181107d0d9bSRemi Denis-Courmont ph = pn_hdr(skb); 182107d0d9bSRemi Denis-Courmont ph->pn_rdev = pn_dev(dst); 183107d0d9bSRemi Denis-Courmont ph->pn_sdev = pn_dev(src); 184107d0d9bSRemi Denis-Courmont ph->pn_res = res; 185107d0d9bSRemi Denis-Courmont ph->pn_length = __cpu_to_be16(skb->len + 2 - sizeof(*ph)); 186107d0d9bSRemi Denis-Courmont ph->pn_robj = pn_obj(dst); 187107d0d9bSRemi Denis-Courmont ph->pn_sobj = pn_obj(src); 188107d0d9bSRemi Denis-Courmont 189107d0d9bSRemi Denis-Courmont skb->protocol = htons(ETH_P_PHONET); 190107d0d9bSRemi Denis-Courmont skb->priority = 0; 191107d0d9bSRemi Denis-Courmont skb->dev = dev; 192107d0d9bSRemi Denis-Courmont 193107d0d9bSRemi Denis-Courmont if (pn_addr(src) == pn_addr(dst)) { 194107d0d9bSRemi Denis-Courmont skb_reset_mac_header(skb); 195107d0d9bSRemi Denis-Courmont skb->pkt_type = PACKET_LOOPBACK; 196107d0d9bSRemi Denis-Courmont skb_orphan(skb); 197be0c52bfSRemi Denis-Courmont if (irq) 198be0c52bfSRemi Denis-Courmont netif_rx(skb); 199be0c52bfSRemi Denis-Courmont else 200107d0d9bSRemi Denis-Courmont netif_rx_ni(skb); 201107d0d9bSRemi Denis-Courmont err = 0; 202107d0d9bSRemi Denis-Courmont } else { 203107d0d9bSRemi Denis-Courmont err = dev_hard_header(skb, dev, ntohs(skb->protocol), 204107d0d9bSRemi Denis-Courmont NULL, NULL, skb->len); 205107d0d9bSRemi Denis-Courmont if (err < 0) { 206107d0d9bSRemi Denis-Courmont err = -EHOSTUNREACH; 207107d0d9bSRemi Denis-Courmont goto drop; 208107d0d9bSRemi Denis-Courmont } 209107d0d9bSRemi Denis-Courmont err = dev_queue_xmit(skb); 210107d0d9bSRemi Denis-Courmont } 211107d0d9bSRemi Denis-Courmont 212107d0d9bSRemi Denis-Courmont return err; 213107d0d9bSRemi Denis-Courmont drop: 214107d0d9bSRemi Denis-Courmont kfree_skb(skb); 215107d0d9bSRemi Denis-Courmont return err; 216107d0d9bSRemi Denis-Courmont } 217107d0d9bSRemi Denis-Courmont 218be0c52bfSRemi Denis-Courmont static int pn_raw_send(const void *data, int len, struct net_device *dev, 219be0c52bfSRemi Denis-Courmont u16 dst, u16 src, u8 res) 220be0c52bfSRemi Denis-Courmont { 221be0c52bfSRemi Denis-Courmont struct sk_buff *skb = alloc_skb(MAX_PHONET_HEADER + len, GFP_ATOMIC); 222be0c52bfSRemi Denis-Courmont if (skb == NULL) 223be0c52bfSRemi Denis-Courmont return -ENOMEM; 224be0c52bfSRemi Denis-Courmont 225be0c52bfSRemi Denis-Courmont skb_reserve(skb, MAX_PHONET_HEADER); 226be0c52bfSRemi Denis-Courmont __skb_put(skb, len); 227be0c52bfSRemi Denis-Courmont skb_copy_to_linear_data(skb, data, len); 228be0c52bfSRemi Denis-Courmont return pn_send(skb, dev, dst, src, res, 1); 229be0c52bfSRemi Denis-Courmont } 230be0c52bfSRemi Denis-Courmont 231107d0d9bSRemi Denis-Courmont /* 232107d0d9bSRemi Denis-Courmont * Create a Phonet header for the skb and send it out. Returns 233107d0d9bSRemi Denis-Courmont * non-zero error code if failed. The skb is freed then. 234107d0d9bSRemi Denis-Courmont */ 235107d0d9bSRemi Denis-Courmont int pn_skb_send(struct sock *sk, struct sk_buff *skb, 236107d0d9bSRemi Denis-Courmont const struct sockaddr_pn *target) 237107d0d9bSRemi Denis-Courmont { 238107d0d9bSRemi Denis-Courmont struct net_device *dev; 239107d0d9bSRemi Denis-Courmont struct pn_sock *pn = pn_sk(sk); 240107d0d9bSRemi Denis-Courmont int err; 241107d0d9bSRemi Denis-Courmont u16 src; 242107d0d9bSRemi Denis-Courmont u8 daddr = pn_sockaddr_get_addr(target), saddr = PN_NO_ADDR; 243107d0d9bSRemi Denis-Courmont 244107d0d9bSRemi Denis-Courmont err = -EHOSTUNREACH; 245107d0d9bSRemi Denis-Courmont if (sk->sk_bound_dev_if) 246107d0d9bSRemi Denis-Courmont dev = dev_get_by_index(sock_net(sk), sk->sk_bound_dev_if); 247107d0d9bSRemi Denis-Courmont else 248107d0d9bSRemi Denis-Courmont dev = phonet_device_get(sock_net(sk)); 249107d0d9bSRemi Denis-Courmont if (!dev || !(dev->flags & IFF_UP)) 250107d0d9bSRemi Denis-Courmont goto drop; 251107d0d9bSRemi Denis-Courmont 252107d0d9bSRemi Denis-Courmont saddr = phonet_address_get(dev, daddr); 253107d0d9bSRemi Denis-Courmont if (saddr == PN_NO_ADDR) 254107d0d9bSRemi Denis-Courmont goto drop; 255107d0d9bSRemi Denis-Courmont 256107d0d9bSRemi Denis-Courmont src = pn->sobject; 257107d0d9bSRemi Denis-Courmont if (!pn_addr(src)) 258107d0d9bSRemi Denis-Courmont src = pn_object(saddr, pn_obj(src)); 259107d0d9bSRemi Denis-Courmont 260107d0d9bSRemi Denis-Courmont err = pn_send(skb, dev, pn_sockaddr_get_object(target), 261be0c52bfSRemi Denis-Courmont src, pn_sockaddr_get_resource(target), 0); 262107d0d9bSRemi Denis-Courmont dev_put(dev); 263107d0d9bSRemi Denis-Courmont return err; 264107d0d9bSRemi Denis-Courmont 265107d0d9bSRemi Denis-Courmont drop: 266107d0d9bSRemi Denis-Courmont kfree_skb(skb); 267107d0d9bSRemi Denis-Courmont if (dev) 268107d0d9bSRemi Denis-Courmont dev_put(dev); 269107d0d9bSRemi Denis-Courmont return err; 270107d0d9bSRemi Denis-Courmont } 271107d0d9bSRemi Denis-Courmont EXPORT_SYMBOL(pn_skb_send); 272107d0d9bSRemi Denis-Courmont 273be0c52bfSRemi Denis-Courmont /* Do not send an error message in response to an error message */ 274be0c52bfSRemi Denis-Courmont static inline int can_respond(struct sk_buff *skb) 275be0c52bfSRemi Denis-Courmont { 276be0c52bfSRemi Denis-Courmont const struct phonethdr *ph; 277be0c52bfSRemi Denis-Courmont const struct phonetmsg *pm; 278be0c52bfSRemi Denis-Courmont u8 submsg_id; 279be0c52bfSRemi Denis-Courmont 280be0c52bfSRemi Denis-Courmont if (!pskb_may_pull(skb, 3)) 281be0c52bfSRemi Denis-Courmont return 0; 282be0c52bfSRemi Denis-Courmont 283be0c52bfSRemi Denis-Courmont ph = pn_hdr(skb); 284be0c52bfSRemi Denis-Courmont if (ph->pn_res == PN_PREFIX && !pskb_may_pull(skb, 5)) 285be0c52bfSRemi Denis-Courmont return 0; 286c3a90c78SRemi Denis-Courmont if (ph->pn_res == PN_COMMGR) /* indications */ 287c3a90c78SRemi Denis-Courmont return 0; 288be0c52bfSRemi Denis-Courmont 289be0c52bfSRemi Denis-Courmont ph = pn_hdr(skb); /* re-acquires the pointer */ 290be0c52bfSRemi Denis-Courmont pm = pn_msg(skb); 291be0c52bfSRemi Denis-Courmont if (pm->pn_msg_id != PN_COMMON_MESSAGE) 292be0c52bfSRemi Denis-Courmont return 1; 293be0c52bfSRemi Denis-Courmont submsg_id = (ph->pn_res == PN_PREFIX) 294be0c52bfSRemi Denis-Courmont ? pm->pn_e_submsg_id : pm->pn_submsg_id; 295be0c52bfSRemi Denis-Courmont if (submsg_id != PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP && 296be0c52bfSRemi Denis-Courmont pm->pn_e_submsg_id != PN_COMM_SERVICE_NOT_IDENTIFIED_RESP) 297be0c52bfSRemi Denis-Courmont return 1; 298be0c52bfSRemi Denis-Courmont return 0; 299be0c52bfSRemi Denis-Courmont } 300be0c52bfSRemi Denis-Courmont 301be0c52bfSRemi Denis-Courmont static int send_obj_unreachable(struct sk_buff *rskb) 302be0c52bfSRemi Denis-Courmont { 303be0c52bfSRemi Denis-Courmont const struct phonethdr *oph = pn_hdr(rskb); 304be0c52bfSRemi Denis-Courmont const struct phonetmsg *opm = pn_msg(rskb); 305be0c52bfSRemi Denis-Courmont struct phonetmsg resp; 306be0c52bfSRemi Denis-Courmont 307be0c52bfSRemi Denis-Courmont memset(&resp, 0, sizeof(resp)); 308be0c52bfSRemi Denis-Courmont resp.pn_trans_id = opm->pn_trans_id; 309be0c52bfSRemi Denis-Courmont resp.pn_msg_id = PN_COMMON_MESSAGE; 310be0c52bfSRemi Denis-Courmont if (oph->pn_res == PN_PREFIX) { 311be0c52bfSRemi Denis-Courmont resp.pn_e_res_id = opm->pn_e_res_id; 312be0c52bfSRemi Denis-Courmont resp.pn_e_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP; 313be0c52bfSRemi Denis-Courmont resp.pn_e_orig_msg_id = opm->pn_msg_id; 314be0c52bfSRemi Denis-Courmont resp.pn_e_status = 0; 315be0c52bfSRemi Denis-Courmont } else { 316be0c52bfSRemi Denis-Courmont resp.pn_submsg_id = PN_COMM_ISA_ENTITY_NOT_REACHABLE_RESP; 317be0c52bfSRemi Denis-Courmont resp.pn_orig_msg_id = opm->pn_msg_id; 318be0c52bfSRemi Denis-Courmont resp.pn_status = 0; 319be0c52bfSRemi Denis-Courmont } 320be0c52bfSRemi Denis-Courmont return pn_raw_send(&resp, sizeof(resp), rskb->dev, 321be0c52bfSRemi Denis-Courmont pn_object(oph->pn_sdev, oph->pn_sobj), 322be0c52bfSRemi Denis-Courmont pn_object(oph->pn_rdev, oph->pn_robj), 323be0c52bfSRemi Denis-Courmont oph->pn_res); 324be0c52bfSRemi Denis-Courmont } 325be0c52bfSRemi Denis-Courmont 326be0c52bfSRemi Denis-Courmont static int send_reset_indications(struct sk_buff *rskb) 327be0c52bfSRemi Denis-Courmont { 328be0c52bfSRemi Denis-Courmont struct phonethdr *oph = pn_hdr(rskb); 329be0c52bfSRemi Denis-Courmont static const u8 data[4] = { 330be0c52bfSRemi Denis-Courmont 0x00 /* trans ID */, 0x10 /* subscribe msg */, 331be0c52bfSRemi Denis-Courmont 0x00 /* subscription count */, 0x00 /* dummy */ 332be0c52bfSRemi Denis-Courmont }; 333be0c52bfSRemi Denis-Courmont 334be0c52bfSRemi Denis-Courmont return pn_raw_send(data, sizeof(data), rskb->dev, 335be0c52bfSRemi Denis-Courmont pn_object(oph->pn_sdev, 0x00), 336c3a90c78SRemi Denis-Courmont pn_object(oph->pn_rdev, oph->pn_robj), 337c3a90c78SRemi Denis-Courmont PN_COMMGR); 338be0c52bfSRemi Denis-Courmont } 339be0c52bfSRemi Denis-Courmont 340be0c52bfSRemi Denis-Courmont 3414b07b3f6SRemi Denis-Courmont /* packet type functions */ 3424b07b3f6SRemi Denis-Courmont 3434b07b3f6SRemi Denis-Courmont /* 3444b07b3f6SRemi Denis-Courmont * Stuff received packets to associated sockets. 3454b07b3f6SRemi Denis-Courmont * On error, returns non-zero and releases the skb. 3464b07b3f6SRemi Denis-Courmont */ 3474b07b3f6SRemi Denis-Courmont static int phonet_rcv(struct sk_buff *skb, struct net_device *dev, 3484b07b3f6SRemi Denis-Courmont struct packet_type *pkttype, 3494b07b3f6SRemi Denis-Courmont struct net_device *orig_dev) 3504b07b3f6SRemi Denis-Courmont { 3514b8f704bSremi.denis-courmont@nokia struct net *net = dev_net(dev); 3524b07b3f6SRemi Denis-Courmont struct phonethdr *ph; 3534b07b3f6SRemi Denis-Courmont struct sockaddr_pn sa; 3544b07b3f6SRemi Denis-Courmont u16 len; 3554b07b3f6SRemi Denis-Courmont 3564b07b3f6SRemi Denis-Courmont /* check we have at least a full Phonet header */ 3574b07b3f6SRemi Denis-Courmont if (!pskb_pull(skb, sizeof(struct phonethdr))) 3584b07b3f6SRemi Denis-Courmont goto out; 3594b07b3f6SRemi Denis-Courmont 3604b07b3f6SRemi Denis-Courmont /* check that the advertised length is correct */ 3614b07b3f6SRemi Denis-Courmont ph = pn_hdr(skb); 3624b07b3f6SRemi Denis-Courmont len = get_unaligned_be16(&ph->pn_length); 3634b07b3f6SRemi Denis-Courmont if (len < 2) 3644b07b3f6SRemi Denis-Courmont goto out; 3654b07b3f6SRemi Denis-Courmont len -= 2; 3664b07b3f6SRemi Denis-Courmont if ((len > skb->len) || pskb_trim(skb, len)) 3674b07b3f6SRemi Denis-Courmont goto out; 3684b07b3f6SRemi Denis-Courmont skb_reset_transport_header(skb); 3694b07b3f6SRemi Denis-Courmont 3704b07b3f6SRemi Denis-Courmont pn_skb_get_dst_sockaddr(skb, &sa); 3714b07b3f6SRemi Denis-Courmont 3724b8f704bSremi.denis-courmont@nokia /* check if we are the destination */ 3734b8f704bSremi.denis-courmont@nokia if (phonet_address_lookup(net, pn_sockaddr_get_addr(&sa)) == 0) { 3744b8f704bSremi.denis-courmont@nokia /* Phonet packet input */ 3754b8f704bSremi.denis-courmont@nokia struct sock *sk = pn_find_sock_by_sa(net, &sa); 3764b8f704bSremi.denis-courmont@nokia 3774b8f704bSremi.denis-courmont@nokia if (sk) 3784b8f704bSremi.denis-courmont@nokia return sk_receive_skb(sk, skb, 0); 3794b8f704bSremi.denis-courmont@nokia 380be0c52bfSRemi Denis-Courmont if (can_respond(skb)) { 381be0c52bfSRemi Denis-Courmont send_obj_unreachable(skb); 382be0c52bfSRemi Denis-Courmont send_reset_indications(skb); 383be0c52bfSRemi Denis-Courmont } 384be0c52bfSRemi Denis-Courmont } 385ba113a94SRemi Denis-Courmont 3864b07b3f6SRemi Denis-Courmont out: 3874b07b3f6SRemi Denis-Courmont kfree_skb(skb); 3884b07b3f6SRemi Denis-Courmont return NET_RX_DROP; 3894b07b3f6SRemi Denis-Courmont } 3904b07b3f6SRemi Denis-Courmont 3917546dd97SStephen Hemminger static struct packet_type phonet_packet_type __read_mostly = { 39209640e63SHarvey Harrison .type = cpu_to_be16(ETH_P_PHONET), 3934b07b3f6SRemi Denis-Courmont .func = phonet_rcv, 3944b07b3f6SRemi Denis-Courmont }; 3954b07b3f6SRemi Denis-Courmont 3964b07b3f6SRemi Denis-Courmont int __init_or_module phonet_proto_register(int protocol, 3974b07b3f6SRemi Denis-Courmont struct phonet_protocol *pp) 3984b07b3f6SRemi Denis-Courmont { 3994b07b3f6SRemi Denis-Courmont int err = 0; 4004b07b3f6SRemi Denis-Courmont 4014b07b3f6SRemi Denis-Courmont if (protocol >= PHONET_NPROTO) 4024b07b3f6SRemi Denis-Courmont return -EINVAL; 4034b07b3f6SRemi Denis-Courmont 4044b07b3f6SRemi Denis-Courmont err = proto_register(pp->prot, 1); 4054b07b3f6SRemi Denis-Courmont if (err) 4064b07b3f6SRemi Denis-Courmont return err; 4074b07b3f6SRemi Denis-Courmont 4084b07b3f6SRemi Denis-Courmont spin_lock(&proto_tab_lock); 4094b07b3f6SRemi Denis-Courmont if (proto_tab[protocol]) 4104b07b3f6SRemi Denis-Courmont err = -EBUSY; 4114b07b3f6SRemi Denis-Courmont else 4124b07b3f6SRemi Denis-Courmont proto_tab[protocol] = pp; 4134b07b3f6SRemi Denis-Courmont spin_unlock(&proto_tab_lock); 4144b07b3f6SRemi Denis-Courmont 4154b07b3f6SRemi Denis-Courmont return err; 4164b07b3f6SRemi Denis-Courmont } 4174b07b3f6SRemi Denis-Courmont EXPORT_SYMBOL(phonet_proto_register); 4184b07b3f6SRemi Denis-Courmont 4194b07b3f6SRemi Denis-Courmont void phonet_proto_unregister(int protocol, struct phonet_protocol *pp) 4204b07b3f6SRemi Denis-Courmont { 4214b07b3f6SRemi Denis-Courmont spin_lock(&proto_tab_lock); 4224b07b3f6SRemi Denis-Courmont BUG_ON(proto_tab[protocol] != pp); 4234b07b3f6SRemi Denis-Courmont proto_tab[protocol] = NULL; 4244b07b3f6SRemi Denis-Courmont spin_unlock(&proto_tab_lock); 4254b07b3f6SRemi Denis-Courmont proto_unregister(pp->prot); 4264b07b3f6SRemi Denis-Courmont } 4274b07b3f6SRemi Denis-Courmont EXPORT_SYMBOL(phonet_proto_unregister); 4284b07b3f6SRemi Denis-Courmont 4294b07b3f6SRemi Denis-Courmont /* Module registration */ 4304b07b3f6SRemi Denis-Courmont static int __init phonet_init(void) 4314b07b3f6SRemi Denis-Courmont { 4324b07b3f6SRemi Denis-Courmont int err; 4334b07b3f6SRemi Denis-Courmont 43476e02cf6Sremi.denis-courmont@nokia err = phonet_device_init(); 43576e02cf6Sremi.denis-courmont@nokia if (err) 43676e02cf6Sremi.denis-courmont@nokia return err; 43776e02cf6Sremi.denis-courmont@nokia 4384b07b3f6SRemi Denis-Courmont err = sock_register(&phonet_proto_family); 4394b07b3f6SRemi Denis-Courmont if (err) { 4404b07b3f6SRemi Denis-Courmont printk(KERN_ALERT 4414b07b3f6SRemi Denis-Courmont "phonet protocol family initialization failed\n"); 44276e02cf6Sremi.denis-courmont@nokia goto err_sock; 4434b07b3f6SRemi Denis-Courmont } 4444b07b3f6SRemi Denis-Courmont 4454b07b3f6SRemi Denis-Courmont dev_add_pack(&phonet_packet_type); 44687ab4e20SRemi Denis-Courmont phonet_sysctl_init(); 447107d0d9bSRemi Denis-Courmont 448107d0d9bSRemi Denis-Courmont err = isi_register(); 449107d0d9bSRemi Denis-Courmont if (err) 450107d0d9bSRemi Denis-Courmont goto err; 4514b07b3f6SRemi Denis-Courmont return 0; 452107d0d9bSRemi Denis-Courmont 453107d0d9bSRemi Denis-Courmont err: 45487ab4e20SRemi Denis-Courmont phonet_sysctl_exit(); 45525532824SRémi Denis-Courmont sock_unregister(PF_PHONET); 456107d0d9bSRemi Denis-Courmont dev_remove_pack(&phonet_packet_type); 45776e02cf6Sremi.denis-courmont@nokia err_sock: 458107d0d9bSRemi Denis-Courmont phonet_device_exit(); 459107d0d9bSRemi Denis-Courmont return err; 4604b07b3f6SRemi Denis-Courmont } 4614b07b3f6SRemi Denis-Courmont 4624b07b3f6SRemi Denis-Courmont static void __exit phonet_exit(void) 4634b07b3f6SRemi Denis-Courmont { 464107d0d9bSRemi Denis-Courmont isi_unregister(); 46587ab4e20SRemi Denis-Courmont phonet_sysctl_exit(); 46625532824SRémi Denis-Courmont sock_unregister(PF_PHONET); 4674b07b3f6SRemi Denis-Courmont dev_remove_pack(&phonet_packet_type); 468f8ff6028SRemi Denis-Courmont phonet_device_exit(); 4694b07b3f6SRemi Denis-Courmont } 4704b07b3f6SRemi Denis-Courmont 4714b07b3f6SRemi Denis-Courmont module_init(phonet_init); 4724b07b3f6SRemi Denis-Courmont module_exit(phonet_exit); 4734b07b3f6SRemi Denis-Courmont MODULE_DESCRIPTION("Phonet protocol stack for Linux"); 4744b07b3f6SRemi Denis-Courmont MODULE_LICENSE("GPL"); 47525532824SRémi Denis-Courmont MODULE_ALIAS_NETPROTO(PF_PHONET); 476