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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*
0003  * Copyright (C) 2011  Intel Corporation. All rights reserved.
0004  * Copyright (C) 2014 Marvell International Ltd.
0005  */
0006 
0007 #define pr_fmt(fmt) "llcp: %s: " fmt, __func__
0008 
0009 #include <linux/init.h>
0010 #include <linux/kernel.h>
0011 #include <linux/list.h>
0012 #include <linux/nfc.h>
0013 
0014 #include "nfc.h"
0015 #include "llcp.h"
0016 
0017 static u8 llcp_magic[3] = {0x46, 0x66, 0x6d};
0018 
0019 static LIST_HEAD(llcp_devices);
0020 
0021 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb);
0022 
0023 void nfc_llcp_sock_link(struct llcp_sock_list *l, struct sock *sk)
0024 {
0025     write_lock(&l->lock);
0026     sk_add_node(sk, &l->head);
0027     write_unlock(&l->lock);
0028 }
0029 
0030 void nfc_llcp_sock_unlink(struct llcp_sock_list *l, struct sock *sk)
0031 {
0032     write_lock(&l->lock);
0033     sk_del_node_init(sk);
0034     write_unlock(&l->lock);
0035 }
0036 
0037 void nfc_llcp_socket_remote_param_init(struct nfc_llcp_sock *sock)
0038 {
0039     sock->remote_rw = LLCP_DEFAULT_RW;
0040     sock->remote_miu = LLCP_MAX_MIU + 1;
0041 }
0042 
0043 static void nfc_llcp_socket_purge(struct nfc_llcp_sock *sock)
0044 {
0045     struct nfc_llcp_local *local = sock->local;
0046     struct sk_buff *s, *tmp;
0047 
0048     skb_queue_purge(&sock->tx_queue);
0049     skb_queue_purge(&sock->tx_pending_queue);
0050 
0051     if (local == NULL)
0052         return;
0053 
0054     /* Search for local pending SKBs that are related to this socket */
0055     skb_queue_walk_safe(&local->tx_queue, s, tmp) {
0056         if (s->sk != &sock->sk)
0057             continue;
0058 
0059         skb_unlink(s, &local->tx_queue);
0060         kfree_skb(s);
0061     }
0062 }
0063 
0064 static void nfc_llcp_socket_release(struct nfc_llcp_local *local, bool device,
0065                     int err)
0066 {
0067     struct sock *sk;
0068     struct hlist_node *tmp;
0069     struct nfc_llcp_sock *llcp_sock;
0070 
0071     skb_queue_purge(&local->tx_queue);
0072 
0073     write_lock(&local->sockets.lock);
0074 
0075     sk_for_each_safe(sk, tmp, &local->sockets.head) {
0076         llcp_sock = nfc_llcp_sock(sk);
0077 
0078         bh_lock_sock(sk);
0079 
0080         nfc_llcp_socket_purge(llcp_sock);
0081 
0082         if (sk->sk_state == LLCP_CONNECTED)
0083             nfc_put_device(llcp_sock->dev);
0084 
0085         if (sk->sk_state == LLCP_LISTEN) {
0086             struct nfc_llcp_sock *lsk, *n;
0087             struct sock *accept_sk;
0088 
0089             list_for_each_entry_safe(lsk, n,
0090                          &llcp_sock->accept_queue,
0091                          accept_queue) {
0092                 accept_sk = &lsk->sk;
0093                 bh_lock_sock(accept_sk);
0094 
0095                 nfc_llcp_accept_unlink(accept_sk);
0096 
0097                 if (err)
0098                     accept_sk->sk_err = err;
0099                 accept_sk->sk_state = LLCP_CLOSED;
0100                 accept_sk->sk_state_change(sk);
0101 
0102                 bh_unlock_sock(accept_sk);
0103             }
0104         }
0105 
0106         if (err)
0107             sk->sk_err = err;
0108         sk->sk_state = LLCP_CLOSED;
0109         sk->sk_state_change(sk);
0110 
0111         bh_unlock_sock(sk);
0112 
0113         sk_del_node_init(sk);
0114     }
0115 
0116     write_unlock(&local->sockets.lock);
0117 
0118     /* If we still have a device, we keep the RAW sockets alive */
0119     if (device == true)
0120         return;
0121 
0122     write_lock(&local->raw_sockets.lock);
0123 
0124     sk_for_each_safe(sk, tmp, &local->raw_sockets.head) {
0125         llcp_sock = nfc_llcp_sock(sk);
0126 
0127         bh_lock_sock(sk);
0128 
0129         nfc_llcp_socket_purge(llcp_sock);
0130 
0131         if (err)
0132             sk->sk_err = err;
0133         sk->sk_state = LLCP_CLOSED;
0134         sk->sk_state_change(sk);
0135 
0136         bh_unlock_sock(sk);
0137 
0138         sk_del_node_init(sk);
0139     }
0140 
0141     write_unlock(&local->raw_sockets.lock);
0142 }
0143 
0144 struct nfc_llcp_local *nfc_llcp_local_get(struct nfc_llcp_local *local)
0145 {
0146     kref_get(&local->ref);
0147 
0148     return local;
0149 }
0150 
0151 static void local_cleanup(struct nfc_llcp_local *local)
0152 {
0153     nfc_llcp_socket_release(local, false, ENXIO);
0154     del_timer_sync(&local->link_timer);
0155     skb_queue_purge(&local->tx_queue);
0156     cancel_work_sync(&local->tx_work);
0157     cancel_work_sync(&local->rx_work);
0158     cancel_work_sync(&local->timeout_work);
0159     kfree_skb(local->rx_pending);
0160     del_timer_sync(&local->sdreq_timer);
0161     cancel_work_sync(&local->sdreq_timeout_work);
0162     nfc_llcp_free_sdp_tlv_list(&local->pending_sdreqs);
0163 }
0164 
0165 static void local_release(struct kref *ref)
0166 {
0167     struct nfc_llcp_local *local;
0168 
0169     local = container_of(ref, struct nfc_llcp_local, ref);
0170 
0171     list_del(&local->list);
0172     local_cleanup(local);
0173     kfree(local);
0174 }
0175 
0176 int nfc_llcp_local_put(struct nfc_llcp_local *local)
0177 {
0178     if (local == NULL)
0179         return 0;
0180 
0181     return kref_put(&local->ref, local_release);
0182 }
0183 
0184 static struct nfc_llcp_sock *nfc_llcp_sock_get(struct nfc_llcp_local *local,
0185                            u8 ssap, u8 dsap)
0186 {
0187     struct sock *sk;
0188     struct nfc_llcp_sock *llcp_sock, *tmp_sock;
0189 
0190     pr_debug("ssap dsap %d %d\n", ssap, dsap);
0191 
0192     if (ssap == 0 && dsap == 0)
0193         return NULL;
0194 
0195     read_lock(&local->sockets.lock);
0196 
0197     llcp_sock = NULL;
0198 
0199     sk_for_each(sk, &local->sockets.head) {
0200         tmp_sock = nfc_llcp_sock(sk);
0201 
0202         if (tmp_sock->ssap == ssap && tmp_sock->dsap == dsap) {
0203             llcp_sock = tmp_sock;
0204             break;
0205         }
0206     }
0207 
0208     read_unlock(&local->sockets.lock);
0209 
0210     if (llcp_sock == NULL)
0211         return NULL;
0212 
0213     sock_hold(&llcp_sock->sk);
0214 
0215     return llcp_sock;
0216 }
0217 
0218 static void nfc_llcp_sock_put(struct nfc_llcp_sock *sock)
0219 {
0220     sock_put(&sock->sk);
0221 }
0222 
0223 static void nfc_llcp_timeout_work(struct work_struct *work)
0224 {
0225     struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
0226                             timeout_work);
0227 
0228     nfc_dep_link_down(local->dev);
0229 }
0230 
0231 static void nfc_llcp_symm_timer(struct timer_list *t)
0232 {
0233     struct nfc_llcp_local *local = from_timer(local, t, link_timer);
0234 
0235     pr_err("SYMM timeout\n");
0236 
0237     schedule_work(&local->timeout_work);
0238 }
0239 
0240 static void nfc_llcp_sdreq_timeout_work(struct work_struct *work)
0241 {
0242     unsigned long time;
0243     HLIST_HEAD(nl_sdres_list);
0244     struct hlist_node *n;
0245     struct nfc_llcp_sdp_tlv *sdp;
0246     struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
0247                             sdreq_timeout_work);
0248 
0249     mutex_lock(&local->sdreq_lock);
0250 
0251     time = jiffies - msecs_to_jiffies(3 * local->remote_lto);
0252 
0253     hlist_for_each_entry_safe(sdp, n, &local->pending_sdreqs, node) {
0254         if (time_after(sdp->time, time))
0255             continue;
0256 
0257         sdp->sap = LLCP_SDP_UNBOUND;
0258 
0259         hlist_del(&sdp->node);
0260 
0261         hlist_add_head(&sdp->node, &nl_sdres_list);
0262     }
0263 
0264     if (!hlist_empty(&local->pending_sdreqs))
0265         mod_timer(&local->sdreq_timer,
0266               jiffies + msecs_to_jiffies(3 * local->remote_lto));
0267 
0268     mutex_unlock(&local->sdreq_lock);
0269 
0270     if (!hlist_empty(&nl_sdres_list))
0271         nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
0272 }
0273 
0274 static void nfc_llcp_sdreq_timer(struct timer_list *t)
0275 {
0276     struct nfc_llcp_local *local = from_timer(local, t, sdreq_timer);
0277 
0278     schedule_work(&local->sdreq_timeout_work);
0279 }
0280 
0281 struct nfc_llcp_local *nfc_llcp_find_local(struct nfc_dev *dev)
0282 {
0283     struct nfc_llcp_local *local;
0284 
0285     list_for_each_entry(local, &llcp_devices, list)
0286         if (local->dev == dev)
0287             return local;
0288 
0289     pr_debug("No device found\n");
0290 
0291     return NULL;
0292 }
0293 
0294 static char *wks[] = {
0295     NULL,
0296     NULL, /* SDP */
0297     "urn:nfc:sn:ip",
0298     "urn:nfc:sn:obex",
0299     "urn:nfc:sn:snep",
0300 };
0301 
0302 static int nfc_llcp_wks_sap(const char *service_name, size_t service_name_len)
0303 {
0304     int sap, num_wks;
0305 
0306     pr_debug("%s\n", service_name);
0307 
0308     if (service_name == NULL)
0309         return -EINVAL;
0310 
0311     num_wks = ARRAY_SIZE(wks);
0312 
0313     for (sap = 0; sap < num_wks; sap++) {
0314         if (wks[sap] == NULL)
0315             continue;
0316 
0317         if (strncmp(wks[sap], service_name, service_name_len) == 0)
0318             return sap;
0319     }
0320 
0321     return -EINVAL;
0322 }
0323 
0324 static
0325 struct nfc_llcp_sock *nfc_llcp_sock_from_sn(struct nfc_llcp_local *local,
0326                         const u8 *sn, size_t sn_len)
0327 {
0328     struct sock *sk;
0329     struct nfc_llcp_sock *llcp_sock, *tmp_sock;
0330 
0331     pr_debug("sn %zd %p\n", sn_len, sn);
0332 
0333     if (sn == NULL || sn_len == 0)
0334         return NULL;
0335 
0336     read_lock(&local->sockets.lock);
0337 
0338     llcp_sock = NULL;
0339 
0340     sk_for_each(sk, &local->sockets.head) {
0341         tmp_sock = nfc_llcp_sock(sk);
0342 
0343         pr_debug("llcp sock %p\n", tmp_sock);
0344 
0345         if (tmp_sock->sk.sk_type == SOCK_STREAM &&
0346             tmp_sock->sk.sk_state != LLCP_LISTEN)
0347             continue;
0348 
0349         if (tmp_sock->sk.sk_type == SOCK_DGRAM &&
0350             tmp_sock->sk.sk_state != LLCP_BOUND)
0351             continue;
0352 
0353         if (tmp_sock->service_name == NULL ||
0354             tmp_sock->service_name_len == 0)
0355             continue;
0356 
0357         if (tmp_sock->service_name_len != sn_len)
0358             continue;
0359 
0360         if (memcmp(sn, tmp_sock->service_name, sn_len) == 0) {
0361             llcp_sock = tmp_sock;
0362             break;
0363         }
0364     }
0365 
0366     read_unlock(&local->sockets.lock);
0367 
0368     pr_debug("Found llcp sock %p\n", llcp_sock);
0369 
0370     return llcp_sock;
0371 }
0372 
0373 u8 nfc_llcp_get_sdp_ssap(struct nfc_llcp_local *local,
0374              struct nfc_llcp_sock *sock)
0375 {
0376     mutex_lock(&local->sdp_lock);
0377 
0378     if (sock->service_name != NULL && sock->service_name_len > 0) {
0379         int ssap = nfc_llcp_wks_sap(sock->service_name,
0380                         sock->service_name_len);
0381 
0382         if (ssap > 0) {
0383             pr_debug("WKS %d\n", ssap);
0384 
0385             /* This is a WKS, let's check if it's free */
0386             if (test_bit(ssap, &local->local_wks)) {
0387                 mutex_unlock(&local->sdp_lock);
0388 
0389                 return LLCP_SAP_MAX;
0390             }
0391 
0392             set_bit(ssap, &local->local_wks);
0393             mutex_unlock(&local->sdp_lock);
0394 
0395             return ssap;
0396         }
0397 
0398         /*
0399          * Check if there already is a non WKS socket bound
0400          * to this service name.
0401          */
0402         if (nfc_llcp_sock_from_sn(local, sock->service_name,
0403                       sock->service_name_len) != NULL) {
0404             mutex_unlock(&local->sdp_lock);
0405 
0406             return LLCP_SAP_MAX;
0407         }
0408 
0409         mutex_unlock(&local->sdp_lock);
0410 
0411         return LLCP_SDP_UNBOUND;
0412 
0413     } else if (sock->ssap != 0 && sock->ssap < LLCP_WKS_NUM_SAP) {
0414         if (!test_bit(sock->ssap, &local->local_wks)) {
0415             set_bit(sock->ssap, &local->local_wks);
0416             mutex_unlock(&local->sdp_lock);
0417 
0418             return sock->ssap;
0419         }
0420     }
0421 
0422     mutex_unlock(&local->sdp_lock);
0423 
0424     return LLCP_SAP_MAX;
0425 }
0426 
0427 u8 nfc_llcp_get_local_ssap(struct nfc_llcp_local *local)
0428 {
0429     u8 local_ssap;
0430 
0431     mutex_lock(&local->sdp_lock);
0432 
0433     local_ssap = find_first_zero_bit(&local->local_sap, LLCP_LOCAL_NUM_SAP);
0434     if (local_ssap == LLCP_LOCAL_NUM_SAP) {
0435         mutex_unlock(&local->sdp_lock);
0436         return LLCP_SAP_MAX;
0437     }
0438 
0439     set_bit(local_ssap, &local->local_sap);
0440 
0441     mutex_unlock(&local->sdp_lock);
0442 
0443     return local_ssap + LLCP_LOCAL_SAP_OFFSET;
0444 }
0445 
0446 void nfc_llcp_put_ssap(struct nfc_llcp_local *local, u8 ssap)
0447 {
0448     u8 local_ssap;
0449     unsigned long *sdp;
0450 
0451     if (ssap < LLCP_WKS_NUM_SAP) {
0452         local_ssap = ssap;
0453         sdp = &local->local_wks;
0454     } else if (ssap < LLCP_LOCAL_NUM_SAP) {
0455         atomic_t *client_cnt;
0456 
0457         local_ssap = ssap - LLCP_WKS_NUM_SAP;
0458         sdp = &local->local_sdp;
0459         client_cnt = &local->local_sdp_cnt[local_ssap];
0460 
0461         pr_debug("%d clients\n", atomic_read(client_cnt));
0462 
0463         mutex_lock(&local->sdp_lock);
0464 
0465         if (atomic_dec_and_test(client_cnt)) {
0466             struct nfc_llcp_sock *l_sock;
0467 
0468             pr_debug("No more clients for SAP %d\n", ssap);
0469 
0470             clear_bit(local_ssap, sdp);
0471 
0472             /* Find the listening sock and set it back to UNBOUND */
0473             l_sock = nfc_llcp_sock_get(local, ssap, LLCP_SAP_SDP);
0474             if (l_sock) {
0475                 l_sock->ssap = LLCP_SDP_UNBOUND;
0476                 nfc_llcp_sock_put(l_sock);
0477             }
0478         }
0479 
0480         mutex_unlock(&local->sdp_lock);
0481 
0482         return;
0483     } else if (ssap < LLCP_MAX_SAP) {
0484         local_ssap = ssap - LLCP_LOCAL_NUM_SAP;
0485         sdp = &local->local_sap;
0486     } else {
0487         return;
0488     }
0489 
0490     mutex_lock(&local->sdp_lock);
0491 
0492     clear_bit(local_ssap, sdp);
0493 
0494     mutex_unlock(&local->sdp_lock);
0495 }
0496 
0497 static u8 nfc_llcp_reserve_sdp_ssap(struct nfc_llcp_local *local)
0498 {
0499     u8 ssap;
0500 
0501     mutex_lock(&local->sdp_lock);
0502 
0503     ssap = find_first_zero_bit(&local->local_sdp, LLCP_SDP_NUM_SAP);
0504     if (ssap == LLCP_SDP_NUM_SAP) {
0505         mutex_unlock(&local->sdp_lock);
0506 
0507         return LLCP_SAP_MAX;
0508     }
0509 
0510     pr_debug("SDP ssap %d\n", LLCP_WKS_NUM_SAP + ssap);
0511 
0512     set_bit(ssap, &local->local_sdp);
0513 
0514     mutex_unlock(&local->sdp_lock);
0515 
0516     return LLCP_WKS_NUM_SAP + ssap;
0517 }
0518 
0519 static int nfc_llcp_build_gb(struct nfc_llcp_local *local)
0520 {
0521     u8 *gb_cur, version, version_length;
0522     u8 lto_length, wks_length, miux_length;
0523     const u8 *version_tlv = NULL, *lto_tlv = NULL,
0524        *wks_tlv = NULL, *miux_tlv = NULL;
0525     __be16 wks = cpu_to_be16(local->local_wks);
0526     u8 gb_len = 0;
0527     int ret = 0;
0528 
0529     version = LLCP_VERSION_11;
0530     version_tlv = nfc_llcp_build_tlv(LLCP_TLV_VERSION, &version,
0531                      1, &version_length);
0532     if (!version_tlv) {
0533         ret = -ENOMEM;
0534         goto out;
0535     }
0536     gb_len += version_length;
0537 
0538     lto_tlv = nfc_llcp_build_tlv(LLCP_TLV_LTO, &local->lto, 1, &lto_length);
0539     if (!lto_tlv) {
0540         ret = -ENOMEM;
0541         goto out;
0542     }
0543     gb_len += lto_length;
0544 
0545     pr_debug("Local wks 0x%lx\n", local->local_wks);
0546     wks_tlv = nfc_llcp_build_tlv(LLCP_TLV_WKS, (u8 *)&wks, 2, &wks_length);
0547     if (!wks_tlv) {
0548         ret = -ENOMEM;
0549         goto out;
0550     }
0551     gb_len += wks_length;
0552 
0553     miux_tlv = nfc_llcp_build_tlv(LLCP_TLV_MIUX, (u8 *)&local->miux, 0,
0554                       &miux_length);
0555     if (!miux_tlv) {
0556         ret = -ENOMEM;
0557         goto out;
0558     }
0559     gb_len += miux_length;
0560 
0561     gb_len += ARRAY_SIZE(llcp_magic);
0562 
0563     if (gb_len > NFC_MAX_GT_LEN) {
0564         ret = -EINVAL;
0565         goto out;
0566     }
0567 
0568     gb_cur = local->gb;
0569 
0570     memcpy(gb_cur, llcp_magic, ARRAY_SIZE(llcp_magic));
0571     gb_cur += ARRAY_SIZE(llcp_magic);
0572 
0573     memcpy(gb_cur, version_tlv, version_length);
0574     gb_cur += version_length;
0575 
0576     memcpy(gb_cur, lto_tlv, lto_length);
0577     gb_cur += lto_length;
0578 
0579     memcpy(gb_cur, wks_tlv, wks_length);
0580     gb_cur += wks_length;
0581 
0582     memcpy(gb_cur, miux_tlv, miux_length);
0583     gb_cur += miux_length;
0584 
0585     local->gb_len = gb_len;
0586 
0587 out:
0588     kfree(version_tlv);
0589     kfree(lto_tlv);
0590     kfree(wks_tlv);
0591     kfree(miux_tlv);
0592 
0593     return ret;
0594 }
0595 
0596 u8 *nfc_llcp_general_bytes(struct nfc_dev *dev, size_t *general_bytes_len)
0597 {
0598     struct nfc_llcp_local *local;
0599 
0600     local = nfc_llcp_find_local(dev);
0601     if (local == NULL) {
0602         *general_bytes_len = 0;
0603         return NULL;
0604     }
0605 
0606     nfc_llcp_build_gb(local);
0607 
0608     *general_bytes_len = local->gb_len;
0609 
0610     return local->gb;
0611 }
0612 
0613 int nfc_llcp_set_remote_gb(struct nfc_dev *dev, const u8 *gb, u8 gb_len)
0614 {
0615     struct nfc_llcp_local *local;
0616 
0617     if (gb_len < 3 || gb_len > NFC_MAX_GT_LEN)
0618         return -EINVAL;
0619 
0620     local = nfc_llcp_find_local(dev);
0621     if (local == NULL) {
0622         pr_err("No LLCP device\n");
0623         return -ENODEV;
0624     }
0625 
0626     memset(local->remote_gb, 0, NFC_MAX_GT_LEN);
0627     memcpy(local->remote_gb, gb, gb_len);
0628     local->remote_gb_len = gb_len;
0629 
0630     if (memcmp(local->remote_gb, llcp_magic, 3)) {
0631         pr_err("MAC does not support LLCP\n");
0632         return -EINVAL;
0633     }
0634 
0635     return nfc_llcp_parse_gb_tlv(local,
0636                      &local->remote_gb[3],
0637                      local->remote_gb_len - 3);
0638 }
0639 
0640 static u8 nfc_llcp_dsap(const struct sk_buff *pdu)
0641 {
0642     return (pdu->data[0] & 0xfc) >> 2;
0643 }
0644 
0645 static u8 nfc_llcp_ptype(const struct sk_buff *pdu)
0646 {
0647     return ((pdu->data[0] & 0x03) << 2) | ((pdu->data[1] & 0xc0) >> 6);
0648 }
0649 
0650 static u8 nfc_llcp_ssap(const struct sk_buff *pdu)
0651 {
0652     return pdu->data[1] & 0x3f;
0653 }
0654 
0655 static u8 nfc_llcp_ns(const struct sk_buff *pdu)
0656 {
0657     return pdu->data[2] >> 4;
0658 }
0659 
0660 static u8 nfc_llcp_nr(const struct sk_buff *pdu)
0661 {
0662     return pdu->data[2] & 0xf;
0663 }
0664 
0665 static void nfc_llcp_set_nrns(struct nfc_llcp_sock *sock, struct sk_buff *pdu)
0666 {
0667     pdu->data[2] = (sock->send_n << 4) | (sock->recv_n);
0668     sock->send_n = (sock->send_n + 1) % 16;
0669     sock->recv_ack_n = (sock->recv_n - 1) % 16;
0670 }
0671 
0672 void nfc_llcp_send_to_raw_sock(struct nfc_llcp_local *local,
0673                    struct sk_buff *skb, u8 direction)
0674 {
0675     struct sk_buff *skb_copy = NULL, *nskb;
0676     struct sock *sk;
0677     u8 *data;
0678 
0679     read_lock(&local->raw_sockets.lock);
0680 
0681     sk_for_each(sk, &local->raw_sockets.head) {
0682         if (sk->sk_state != LLCP_BOUND)
0683             continue;
0684 
0685         if (skb_copy == NULL) {
0686             skb_copy = __pskb_copy_fclone(skb, NFC_RAW_HEADER_SIZE,
0687                               GFP_ATOMIC, true);
0688 
0689             if (skb_copy == NULL)
0690                 continue;
0691 
0692             data = skb_push(skb_copy, NFC_RAW_HEADER_SIZE);
0693 
0694             data[0] = local->dev ? local->dev->idx : 0xFF;
0695             data[1] = direction & 0x01;
0696             data[1] |= (RAW_PAYLOAD_LLCP << 1);
0697         }
0698 
0699         nskb = skb_clone(skb_copy, GFP_ATOMIC);
0700         if (!nskb)
0701             continue;
0702 
0703         if (sock_queue_rcv_skb(sk, nskb))
0704             kfree_skb(nskb);
0705     }
0706 
0707     read_unlock(&local->raw_sockets.lock);
0708 
0709     kfree_skb(skb_copy);
0710 }
0711 
0712 static void nfc_llcp_tx_work(struct work_struct *work)
0713 {
0714     struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
0715                             tx_work);
0716     struct sk_buff *skb;
0717     struct sock *sk;
0718     struct nfc_llcp_sock *llcp_sock;
0719 
0720     skb = skb_dequeue(&local->tx_queue);
0721     if (skb != NULL) {
0722         sk = skb->sk;
0723         llcp_sock = nfc_llcp_sock(sk);
0724 
0725         if (llcp_sock == NULL && nfc_llcp_ptype(skb) == LLCP_PDU_I) {
0726             kfree_skb(skb);
0727             nfc_llcp_send_symm(local->dev);
0728         } else if (llcp_sock && !llcp_sock->remote_ready) {
0729             skb_queue_head(&local->tx_queue, skb);
0730             nfc_llcp_send_symm(local->dev);
0731         } else {
0732             struct sk_buff *copy_skb = NULL;
0733             u8 ptype = nfc_llcp_ptype(skb);
0734             int ret;
0735 
0736             pr_debug("Sending pending skb\n");
0737             print_hex_dump_debug("LLCP Tx: ", DUMP_PREFIX_OFFSET,
0738                          16, 1, skb->data, skb->len, true);
0739 
0740             if (ptype == LLCP_PDU_I)
0741                 copy_skb = skb_copy(skb, GFP_ATOMIC);
0742 
0743             __net_timestamp(skb);
0744 
0745             nfc_llcp_send_to_raw_sock(local, skb,
0746                           NFC_DIRECTION_TX);
0747 
0748             ret = nfc_data_exchange(local->dev, local->target_idx,
0749                         skb, nfc_llcp_recv, local);
0750 
0751             if (ret) {
0752                 kfree_skb(copy_skb);
0753                 goto out;
0754             }
0755 
0756             if (ptype == LLCP_PDU_I && copy_skb)
0757                 skb_queue_tail(&llcp_sock->tx_pending_queue,
0758                            copy_skb);
0759         }
0760     } else {
0761         nfc_llcp_send_symm(local->dev);
0762     }
0763 
0764 out:
0765     mod_timer(&local->link_timer,
0766           jiffies + msecs_to_jiffies(2 * local->remote_lto));
0767 }
0768 
0769 static struct nfc_llcp_sock *nfc_llcp_connecting_sock_get(struct nfc_llcp_local *local,
0770                               u8 ssap)
0771 {
0772     struct sock *sk;
0773     struct nfc_llcp_sock *llcp_sock;
0774 
0775     read_lock(&local->connecting_sockets.lock);
0776 
0777     sk_for_each(sk, &local->connecting_sockets.head) {
0778         llcp_sock = nfc_llcp_sock(sk);
0779 
0780         if (llcp_sock->ssap == ssap) {
0781             sock_hold(&llcp_sock->sk);
0782             goto out;
0783         }
0784     }
0785 
0786     llcp_sock = NULL;
0787 
0788 out:
0789     read_unlock(&local->connecting_sockets.lock);
0790 
0791     return llcp_sock;
0792 }
0793 
0794 static struct nfc_llcp_sock *nfc_llcp_sock_get_sn(struct nfc_llcp_local *local,
0795                           const u8 *sn, size_t sn_len)
0796 {
0797     struct nfc_llcp_sock *llcp_sock;
0798 
0799     llcp_sock = nfc_llcp_sock_from_sn(local, sn, sn_len);
0800 
0801     if (llcp_sock == NULL)
0802         return NULL;
0803 
0804     sock_hold(&llcp_sock->sk);
0805 
0806     return llcp_sock;
0807 }
0808 
0809 static const u8 *nfc_llcp_connect_sn(const struct sk_buff *skb, size_t *sn_len)
0810 {
0811     u8 type, length;
0812     const u8 *tlv = &skb->data[2];
0813     size_t tlv_array_len = skb->len - LLCP_HEADER_SIZE, offset = 0;
0814 
0815     while (offset < tlv_array_len) {
0816         type = tlv[0];
0817         length = tlv[1];
0818 
0819         pr_debug("type 0x%x length %d\n", type, length);
0820 
0821         if (type == LLCP_TLV_SN) {
0822             *sn_len = length;
0823             return &tlv[2];
0824         }
0825 
0826         offset += length + 2;
0827         tlv += length + 2;
0828     }
0829 
0830     return NULL;
0831 }
0832 
0833 static void nfc_llcp_recv_ui(struct nfc_llcp_local *local,
0834                  struct sk_buff *skb)
0835 {
0836     struct nfc_llcp_sock *llcp_sock;
0837     struct nfc_llcp_ui_cb *ui_cb;
0838     u8 dsap, ssap;
0839 
0840     dsap = nfc_llcp_dsap(skb);
0841     ssap = nfc_llcp_ssap(skb);
0842 
0843     ui_cb = nfc_llcp_ui_skb_cb(skb);
0844     ui_cb->dsap = dsap;
0845     ui_cb->ssap = ssap;
0846 
0847     pr_debug("%d %d\n", dsap, ssap);
0848 
0849     /* We're looking for a bound socket, not a client one */
0850     llcp_sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
0851     if (llcp_sock == NULL || llcp_sock->sk.sk_type != SOCK_DGRAM)
0852         return;
0853 
0854     /* There is no sequence with UI frames */
0855     skb_pull(skb, LLCP_HEADER_SIZE);
0856     if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
0857         /*
0858          * UI frames will be freed from the socket layer, so we
0859          * need to keep them alive until someone receives them.
0860          */
0861         skb_get(skb);
0862     } else {
0863         pr_err("Receive queue is full\n");
0864     }
0865 
0866     nfc_llcp_sock_put(llcp_sock);
0867 }
0868 
0869 static void nfc_llcp_recv_connect(struct nfc_llcp_local *local,
0870                   const struct sk_buff *skb)
0871 {
0872     struct sock *new_sk, *parent;
0873     struct nfc_llcp_sock *sock, *new_sock;
0874     u8 dsap, ssap, reason;
0875 
0876     dsap = nfc_llcp_dsap(skb);
0877     ssap = nfc_llcp_ssap(skb);
0878 
0879     pr_debug("%d %d\n", dsap, ssap);
0880 
0881     if (dsap != LLCP_SAP_SDP) {
0882         sock = nfc_llcp_sock_get(local, dsap, LLCP_SAP_SDP);
0883         if (sock == NULL || sock->sk.sk_state != LLCP_LISTEN) {
0884             reason = LLCP_DM_NOBOUND;
0885             goto fail;
0886         }
0887     } else {
0888         const u8 *sn;
0889         size_t sn_len;
0890 
0891         sn = nfc_llcp_connect_sn(skb, &sn_len);
0892         if (sn == NULL) {
0893             reason = LLCP_DM_NOBOUND;
0894             goto fail;
0895         }
0896 
0897         pr_debug("Service name length %zu\n", sn_len);
0898 
0899         sock = nfc_llcp_sock_get_sn(local, sn, sn_len);
0900         if (sock == NULL) {
0901             reason = LLCP_DM_NOBOUND;
0902             goto fail;
0903         }
0904     }
0905 
0906     lock_sock(&sock->sk);
0907 
0908     parent = &sock->sk;
0909 
0910     if (sk_acceptq_is_full(parent)) {
0911         reason = LLCP_DM_REJ;
0912         release_sock(&sock->sk);
0913         sock_put(&sock->sk);
0914         goto fail;
0915     }
0916 
0917     if (sock->ssap == LLCP_SDP_UNBOUND) {
0918         u8 ssap = nfc_llcp_reserve_sdp_ssap(local);
0919 
0920         pr_debug("First client, reserving %d\n", ssap);
0921 
0922         if (ssap == LLCP_SAP_MAX) {
0923             reason = LLCP_DM_REJ;
0924             release_sock(&sock->sk);
0925             sock_put(&sock->sk);
0926             goto fail;
0927         }
0928 
0929         sock->ssap = ssap;
0930     }
0931 
0932     new_sk = nfc_llcp_sock_alloc(NULL, parent->sk_type, GFP_ATOMIC, 0);
0933     if (new_sk == NULL) {
0934         reason = LLCP_DM_REJ;
0935         release_sock(&sock->sk);
0936         sock_put(&sock->sk);
0937         goto fail;
0938     }
0939 
0940     new_sock = nfc_llcp_sock(new_sk);
0941     new_sock->dev = local->dev;
0942     new_sock->local = nfc_llcp_local_get(local);
0943     new_sock->rw = sock->rw;
0944     new_sock->miux = sock->miux;
0945     new_sock->nfc_protocol = sock->nfc_protocol;
0946     new_sock->dsap = ssap;
0947     new_sock->target_idx = local->target_idx;
0948     new_sock->parent = parent;
0949     new_sock->ssap = sock->ssap;
0950     if (sock->ssap < LLCP_LOCAL_NUM_SAP && sock->ssap >= LLCP_WKS_NUM_SAP) {
0951         atomic_t *client_count;
0952 
0953         pr_debug("reserved_ssap %d for %p\n", sock->ssap, new_sock);
0954 
0955         client_count =
0956             &local->local_sdp_cnt[sock->ssap - LLCP_WKS_NUM_SAP];
0957 
0958         atomic_inc(client_count);
0959         new_sock->reserved_ssap = sock->ssap;
0960     }
0961 
0962     nfc_llcp_parse_connection_tlv(new_sock, &skb->data[LLCP_HEADER_SIZE],
0963                       skb->len - LLCP_HEADER_SIZE);
0964 
0965     pr_debug("new sock %p sk %p\n", new_sock, &new_sock->sk);
0966 
0967     nfc_llcp_sock_link(&local->sockets, new_sk);
0968 
0969     nfc_llcp_accept_enqueue(&sock->sk, new_sk);
0970 
0971     nfc_get_device(local->dev->idx);
0972 
0973     new_sk->sk_state = LLCP_CONNECTED;
0974 
0975     /* Wake the listening processes */
0976     parent->sk_data_ready(parent);
0977 
0978     /* Send CC */
0979     nfc_llcp_send_cc(new_sock);
0980 
0981     release_sock(&sock->sk);
0982     sock_put(&sock->sk);
0983 
0984     return;
0985 
0986 fail:
0987     /* Send DM */
0988     nfc_llcp_send_dm(local, dsap, ssap, reason);
0989 }
0990 
0991 int nfc_llcp_queue_i_frames(struct nfc_llcp_sock *sock)
0992 {
0993     int nr_frames = 0;
0994     struct nfc_llcp_local *local = sock->local;
0995 
0996     pr_debug("Remote ready %d tx queue len %d remote rw %d",
0997          sock->remote_ready, skb_queue_len(&sock->tx_pending_queue),
0998          sock->remote_rw);
0999 
1000     /* Try to queue some I frames for transmission */
1001     while (sock->remote_ready &&
1002            skb_queue_len(&sock->tx_pending_queue) < sock->remote_rw) {
1003         struct sk_buff *pdu;
1004 
1005         pdu = skb_dequeue(&sock->tx_queue);
1006         if (pdu == NULL)
1007             break;
1008 
1009         /* Update N(S)/N(R) */
1010         nfc_llcp_set_nrns(sock, pdu);
1011 
1012         skb_queue_tail(&local->tx_queue, pdu);
1013         nr_frames++;
1014     }
1015 
1016     return nr_frames;
1017 }
1018 
1019 static void nfc_llcp_recv_hdlc(struct nfc_llcp_local *local,
1020                    struct sk_buff *skb)
1021 {
1022     struct nfc_llcp_sock *llcp_sock;
1023     struct sock *sk;
1024     u8 dsap, ssap, ptype, ns, nr;
1025 
1026     ptype = nfc_llcp_ptype(skb);
1027     dsap = nfc_llcp_dsap(skb);
1028     ssap = nfc_llcp_ssap(skb);
1029     ns = nfc_llcp_ns(skb);
1030     nr = nfc_llcp_nr(skb);
1031 
1032     pr_debug("%d %d R %d S %d\n", dsap, ssap, nr, ns);
1033 
1034     llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1035     if (llcp_sock == NULL) {
1036         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1037         return;
1038     }
1039 
1040     sk = &llcp_sock->sk;
1041     lock_sock(sk);
1042     if (sk->sk_state == LLCP_CLOSED) {
1043         release_sock(sk);
1044         nfc_llcp_sock_put(llcp_sock);
1045     }
1046 
1047     /* Pass the payload upstream */
1048     if (ptype == LLCP_PDU_I) {
1049         pr_debug("I frame, queueing on %p\n", &llcp_sock->sk);
1050 
1051         if (ns == llcp_sock->recv_n)
1052             llcp_sock->recv_n = (llcp_sock->recv_n + 1) % 16;
1053         else
1054             pr_err("Received out of sequence I PDU\n");
1055 
1056         skb_pull(skb, LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE);
1057         if (!sock_queue_rcv_skb(&llcp_sock->sk, skb)) {
1058             /*
1059              * I frames will be freed from the socket layer, so we
1060              * need to keep them alive until someone receives them.
1061              */
1062             skb_get(skb);
1063         } else {
1064             pr_err("Receive queue is full\n");
1065         }
1066     }
1067 
1068     /* Remove skbs from the pending queue */
1069     if (llcp_sock->send_ack_n != nr) {
1070         struct sk_buff *s, *tmp;
1071         u8 n;
1072 
1073         llcp_sock->send_ack_n = nr;
1074 
1075         /* Remove and free all skbs until ns == nr */
1076         skb_queue_walk_safe(&llcp_sock->tx_pending_queue, s, tmp) {
1077             n = nfc_llcp_ns(s);
1078 
1079             skb_unlink(s, &llcp_sock->tx_pending_queue);
1080             kfree_skb(s);
1081 
1082             if (n == nr)
1083                 break;
1084         }
1085 
1086         /* Re-queue the remaining skbs for transmission */
1087         skb_queue_reverse_walk_safe(&llcp_sock->tx_pending_queue,
1088                         s, tmp) {
1089             skb_unlink(s, &llcp_sock->tx_pending_queue);
1090             skb_queue_head(&local->tx_queue, s);
1091         }
1092     }
1093 
1094     if (ptype == LLCP_PDU_RR)
1095         llcp_sock->remote_ready = true;
1096     else if (ptype == LLCP_PDU_RNR)
1097         llcp_sock->remote_ready = false;
1098 
1099     if (nfc_llcp_queue_i_frames(llcp_sock) == 0 && ptype == LLCP_PDU_I)
1100         nfc_llcp_send_rr(llcp_sock);
1101 
1102     release_sock(sk);
1103     nfc_llcp_sock_put(llcp_sock);
1104 }
1105 
1106 static void nfc_llcp_recv_disc(struct nfc_llcp_local *local,
1107                    const struct sk_buff *skb)
1108 {
1109     struct nfc_llcp_sock *llcp_sock;
1110     struct sock *sk;
1111     u8 dsap, ssap;
1112 
1113     dsap = nfc_llcp_dsap(skb);
1114     ssap = nfc_llcp_ssap(skb);
1115 
1116     if ((dsap == 0) && (ssap == 0)) {
1117         pr_debug("Connection termination");
1118         nfc_dep_link_down(local->dev);
1119         return;
1120     }
1121 
1122     llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1123     if (llcp_sock == NULL) {
1124         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1125         return;
1126     }
1127 
1128     sk = &llcp_sock->sk;
1129     lock_sock(sk);
1130 
1131     nfc_llcp_socket_purge(llcp_sock);
1132 
1133     if (sk->sk_state == LLCP_CLOSED) {
1134         release_sock(sk);
1135         nfc_llcp_sock_put(llcp_sock);
1136     }
1137 
1138     if (sk->sk_state == LLCP_CONNECTED) {
1139         nfc_put_device(local->dev);
1140         sk->sk_state = LLCP_CLOSED;
1141         sk->sk_state_change(sk);
1142     }
1143 
1144     nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_DISC);
1145 
1146     release_sock(sk);
1147     nfc_llcp_sock_put(llcp_sock);
1148 }
1149 
1150 static void nfc_llcp_recv_cc(struct nfc_llcp_local *local,
1151                  const struct sk_buff *skb)
1152 {
1153     struct nfc_llcp_sock *llcp_sock;
1154     struct sock *sk;
1155     u8 dsap, ssap;
1156 
1157     dsap = nfc_llcp_dsap(skb);
1158     ssap = nfc_llcp_ssap(skb);
1159 
1160     llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1161     if (llcp_sock == NULL) {
1162         pr_err("Invalid CC\n");
1163         nfc_llcp_send_dm(local, dsap, ssap, LLCP_DM_NOCONN);
1164 
1165         return;
1166     }
1167 
1168     sk = &llcp_sock->sk;
1169 
1170     /* Unlink from connecting and link to the client array */
1171     nfc_llcp_sock_unlink(&local->connecting_sockets, sk);
1172     nfc_llcp_sock_link(&local->sockets, sk);
1173     llcp_sock->dsap = ssap;
1174 
1175     nfc_llcp_parse_connection_tlv(llcp_sock, &skb->data[LLCP_HEADER_SIZE],
1176                       skb->len - LLCP_HEADER_SIZE);
1177 
1178     sk->sk_state = LLCP_CONNECTED;
1179     sk->sk_state_change(sk);
1180 
1181     nfc_llcp_sock_put(llcp_sock);
1182 }
1183 
1184 static void nfc_llcp_recv_dm(struct nfc_llcp_local *local,
1185                  const struct sk_buff *skb)
1186 {
1187     struct nfc_llcp_sock *llcp_sock;
1188     struct sock *sk;
1189     u8 dsap, ssap, reason;
1190 
1191     dsap = nfc_llcp_dsap(skb);
1192     ssap = nfc_llcp_ssap(skb);
1193     reason = skb->data[2];
1194 
1195     pr_debug("%d %d reason %d\n", ssap, dsap, reason);
1196 
1197     switch (reason) {
1198     case LLCP_DM_NOBOUND:
1199     case LLCP_DM_REJ:
1200         llcp_sock = nfc_llcp_connecting_sock_get(local, dsap);
1201         break;
1202 
1203     default:
1204         llcp_sock = nfc_llcp_sock_get(local, dsap, ssap);
1205         break;
1206     }
1207 
1208     if (llcp_sock == NULL) {
1209         pr_debug("Already closed\n");
1210         return;
1211     }
1212 
1213     sk = &llcp_sock->sk;
1214 
1215     sk->sk_err = ENXIO;
1216     sk->sk_state = LLCP_CLOSED;
1217     sk->sk_state_change(sk);
1218 
1219     nfc_llcp_sock_put(llcp_sock);
1220 }
1221 
1222 static void nfc_llcp_recv_snl(struct nfc_llcp_local *local,
1223                   const struct sk_buff *skb)
1224 {
1225     struct nfc_llcp_sock *llcp_sock;
1226     u8 dsap, ssap, type, length, tid, sap;
1227     const u8 *tlv;
1228     u16 tlv_len, offset;
1229     const char *service_name;
1230     size_t service_name_len;
1231     struct nfc_llcp_sdp_tlv *sdp;
1232     HLIST_HEAD(llc_sdres_list);
1233     size_t sdres_tlvs_len;
1234     HLIST_HEAD(nl_sdres_list);
1235 
1236     dsap = nfc_llcp_dsap(skb);
1237     ssap = nfc_llcp_ssap(skb);
1238 
1239     pr_debug("%d %d\n", dsap, ssap);
1240 
1241     if (dsap != LLCP_SAP_SDP || ssap != LLCP_SAP_SDP) {
1242         pr_err("Wrong SNL SAP\n");
1243         return;
1244     }
1245 
1246     tlv = &skb->data[LLCP_HEADER_SIZE];
1247     tlv_len = skb->len - LLCP_HEADER_SIZE;
1248     offset = 0;
1249     sdres_tlvs_len = 0;
1250 
1251     while (offset < tlv_len) {
1252         type = tlv[0];
1253         length = tlv[1];
1254 
1255         switch (type) {
1256         case LLCP_TLV_SDREQ:
1257             tid = tlv[2];
1258             service_name = (char *) &tlv[3];
1259             service_name_len = length - 1;
1260 
1261             pr_debug("Looking for %.16s\n", service_name);
1262 
1263             if (service_name_len == strlen("urn:nfc:sn:sdp") &&
1264                 !strncmp(service_name, "urn:nfc:sn:sdp",
1265                      service_name_len)) {
1266                 sap = 1;
1267                 goto add_snl;
1268             }
1269 
1270             llcp_sock = nfc_llcp_sock_from_sn(local, service_name,
1271                               service_name_len);
1272             if (!llcp_sock) {
1273                 sap = 0;
1274                 goto add_snl;
1275             }
1276 
1277             /*
1278              * We found a socket but its ssap has not been reserved
1279              * yet. We need to assign it for good and send a reply.
1280              * The ssap will be freed when the socket is closed.
1281              */
1282             if (llcp_sock->ssap == LLCP_SDP_UNBOUND) {
1283                 atomic_t *client_count;
1284 
1285                 sap = nfc_llcp_reserve_sdp_ssap(local);
1286 
1287                 pr_debug("Reserving %d\n", sap);
1288 
1289                 if (sap == LLCP_SAP_MAX) {
1290                     sap = 0;
1291                     goto add_snl;
1292                 }
1293 
1294                 client_count =
1295                     &local->local_sdp_cnt[sap -
1296                                   LLCP_WKS_NUM_SAP];
1297 
1298                 atomic_inc(client_count);
1299 
1300                 llcp_sock->ssap = sap;
1301                 llcp_sock->reserved_ssap = sap;
1302             } else {
1303                 sap = llcp_sock->ssap;
1304             }
1305 
1306             pr_debug("%p %d\n", llcp_sock, sap);
1307 
1308 add_snl:
1309             sdp = nfc_llcp_build_sdres_tlv(tid, sap);
1310             if (sdp == NULL)
1311                 goto exit;
1312 
1313             sdres_tlvs_len += sdp->tlv_len;
1314             hlist_add_head(&sdp->node, &llc_sdres_list);
1315             break;
1316 
1317         case LLCP_TLV_SDRES:
1318             mutex_lock(&local->sdreq_lock);
1319 
1320             pr_debug("LLCP_TLV_SDRES: searching tid %d\n", tlv[2]);
1321 
1322             hlist_for_each_entry(sdp, &local->pending_sdreqs, node) {
1323                 if (sdp->tid != tlv[2])
1324                     continue;
1325 
1326                 sdp->sap = tlv[3];
1327 
1328                 pr_debug("Found: uri=%s, sap=%d\n",
1329                      sdp->uri, sdp->sap);
1330 
1331                 hlist_del(&sdp->node);
1332 
1333                 hlist_add_head(&sdp->node, &nl_sdres_list);
1334 
1335                 break;
1336             }
1337 
1338             mutex_unlock(&local->sdreq_lock);
1339             break;
1340 
1341         default:
1342             pr_err("Invalid SNL tlv value 0x%x\n", type);
1343             break;
1344         }
1345 
1346         offset += length + 2;
1347         tlv += length + 2;
1348     }
1349 
1350 exit:
1351     if (!hlist_empty(&nl_sdres_list))
1352         nfc_genl_llc_send_sdres(local->dev, &nl_sdres_list);
1353 
1354     if (!hlist_empty(&llc_sdres_list))
1355         nfc_llcp_send_snl_sdres(local, &llc_sdres_list, sdres_tlvs_len);
1356 }
1357 
1358 static void nfc_llcp_recv_agf(struct nfc_llcp_local *local, struct sk_buff *skb)
1359 {
1360     u8 ptype;
1361     u16 pdu_len;
1362     struct sk_buff *new_skb;
1363 
1364     if (skb->len <= LLCP_HEADER_SIZE) {
1365         pr_err("Malformed AGF PDU\n");
1366         return;
1367     }
1368 
1369     skb_pull(skb, LLCP_HEADER_SIZE);
1370 
1371     while (skb->len > LLCP_AGF_PDU_HEADER_SIZE) {
1372         pdu_len = skb->data[0] << 8 | skb->data[1];
1373 
1374         skb_pull(skb, LLCP_AGF_PDU_HEADER_SIZE);
1375 
1376         if (pdu_len < LLCP_HEADER_SIZE || pdu_len > skb->len) {
1377             pr_err("Malformed AGF PDU\n");
1378             return;
1379         }
1380 
1381         ptype = nfc_llcp_ptype(skb);
1382 
1383         if (ptype == LLCP_PDU_SYMM || ptype == LLCP_PDU_AGF)
1384             goto next;
1385 
1386         new_skb = nfc_alloc_recv_skb(pdu_len, GFP_KERNEL);
1387         if (new_skb == NULL) {
1388             pr_err("Could not allocate PDU\n");
1389             return;
1390         }
1391 
1392         skb_put_data(new_skb, skb->data, pdu_len);
1393 
1394         nfc_llcp_rx_skb(local, new_skb);
1395 
1396         kfree_skb(new_skb);
1397 next:
1398         skb_pull(skb, pdu_len);
1399     }
1400 }
1401 
1402 static void nfc_llcp_rx_skb(struct nfc_llcp_local *local, struct sk_buff *skb)
1403 {
1404     u8 dsap, ssap, ptype;
1405 
1406     ptype = nfc_llcp_ptype(skb);
1407     dsap = nfc_llcp_dsap(skb);
1408     ssap = nfc_llcp_ssap(skb);
1409 
1410     pr_debug("ptype 0x%x dsap 0x%x ssap 0x%x\n", ptype, dsap, ssap);
1411 
1412     if (ptype != LLCP_PDU_SYMM)
1413         print_hex_dump_debug("LLCP Rx: ", DUMP_PREFIX_OFFSET, 16, 1,
1414                      skb->data, skb->len, true);
1415 
1416     switch (ptype) {
1417     case LLCP_PDU_SYMM:
1418         pr_debug("SYMM\n");
1419         break;
1420 
1421     case LLCP_PDU_UI:
1422         pr_debug("UI\n");
1423         nfc_llcp_recv_ui(local, skb);
1424         break;
1425 
1426     case LLCP_PDU_CONNECT:
1427         pr_debug("CONNECT\n");
1428         nfc_llcp_recv_connect(local, skb);
1429         break;
1430 
1431     case LLCP_PDU_DISC:
1432         pr_debug("DISC\n");
1433         nfc_llcp_recv_disc(local, skb);
1434         break;
1435 
1436     case LLCP_PDU_CC:
1437         pr_debug("CC\n");
1438         nfc_llcp_recv_cc(local, skb);
1439         break;
1440 
1441     case LLCP_PDU_DM:
1442         pr_debug("DM\n");
1443         nfc_llcp_recv_dm(local, skb);
1444         break;
1445 
1446     case LLCP_PDU_SNL:
1447         pr_debug("SNL\n");
1448         nfc_llcp_recv_snl(local, skb);
1449         break;
1450 
1451     case LLCP_PDU_I:
1452     case LLCP_PDU_RR:
1453     case LLCP_PDU_RNR:
1454         pr_debug("I frame\n");
1455         nfc_llcp_recv_hdlc(local, skb);
1456         break;
1457 
1458     case LLCP_PDU_AGF:
1459         pr_debug("AGF frame\n");
1460         nfc_llcp_recv_agf(local, skb);
1461         break;
1462     }
1463 }
1464 
1465 static void nfc_llcp_rx_work(struct work_struct *work)
1466 {
1467     struct nfc_llcp_local *local = container_of(work, struct nfc_llcp_local,
1468                             rx_work);
1469     struct sk_buff *skb;
1470 
1471     skb = local->rx_pending;
1472     if (skb == NULL) {
1473         pr_debug("No pending SKB\n");
1474         return;
1475     }
1476 
1477     __net_timestamp(skb);
1478 
1479     nfc_llcp_send_to_raw_sock(local, skb, NFC_DIRECTION_RX);
1480 
1481     nfc_llcp_rx_skb(local, skb);
1482 
1483     schedule_work(&local->tx_work);
1484     kfree_skb(local->rx_pending);
1485     local->rx_pending = NULL;
1486 }
1487 
1488 static void __nfc_llcp_recv(struct nfc_llcp_local *local, struct sk_buff *skb)
1489 {
1490     local->rx_pending = skb;
1491     del_timer(&local->link_timer);
1492     schedule_work(&local->rx_work);
1493 }
1494 
1495 void nfc_llcp_recv(void *data, struct sk_buff *skb, int err)
1496 {
1497     struct nfc_llcp_local *local = (struct nfc_llcp_local *) data;
1498 
1499     if (err < 0) {
1500         pr_err("LLCP PDU receive err %d\n", err);
1501         return;
1502     }
1503 
1504     __nfc_llcp_recv(local, skb);
1505 }
1506 
1507 int nfc_llcp_data_received(struct nfc_dev *dev, struct sk_buff *skb)
1508 {
1509     struct nfc_llcp_local *local;
1510 
1511     local = nfc_llcp_find_local(dev);
1512     if (local == NULL) {
1513         kfree_skb(skb);
1514         return -ENODEV;
1515     }
1516 
1517     __nfc_llcp_recv(local, skb);
1518 
1519     return 0;
1520 }
1521 
1522 void nfc_llcp_mac_is_down(struct nfc_dev *dev)
1523 {
1524     struct nfc_llcp_local *local;
1525 
1526     local = nfc_llcp_find_local(dev);
1527     if (local == NULL)
1528         return;
1529 
1530     local->remote_miu = LLCP_DEFAULT_MIU;
1531     local->remote_lto = LLCP_DEFAULT_LTO;
1532 
1533     /* Close and purge all existing sockets */
1534     nfc_llcp_socket_release(local, true, 0);
1535 }
1536 
1537 void nfc_llcp_mac_is_up(struct nfc_dev *dev, u32 target_idx,
1538             u8 comm_mode, u8 rf_mode)
1539 {
1540     struct nfc_llcp_local *local;
1541 
1542     pr_debug("rf mode %d\n", rf_mode);
1543 
1544     local = nfc_llcp_find_local(dev);
1545     if (local == NULL)
1546         return;
1547 
1548     local->target_idx = target_idx;
1549     local->comm_mode = comm_mode;
1550     local->rf_mode = rf_mode;
1551 
1552     if (rf_mode == NFC_RF_INITIATOR) {
1553         pr_debug("Queueing Tx work\n");
1554 
1555         schedule_work(&local->tx_work);
1556     } else {
1557         mod_timer(&local->link_timer,
1558               jiffies + msecs_to_jiffies(local->remote_lto));
1559     }
1560 }
1561 
1562 int nfc_llcp_register_device(struct nfc_dev *ndev)
1563 {
1564     struct nfc_llcp_local *local;
1565 
1566     local = kzalloc(sizeof(struct nfc_llcp_local), GFP_KERNEL);
1567     if (local == NULL)
1568         return -ENOMEM;
1569 
1570     local->dev = ndev;
1571     INIT_LIST_HEAD(&local->list);
1572     kref_init(&local->ref);
1573     mutex_init(&local->sdp_lock);
1574     timer_setup(&local->link_timer, nfc_llcp_symm_timer, 0);
1575 
1576     skb_queue_head_init(&local->tx_queue);
1577     INIT_WORK(&local->tx_work, nfc_llcp_tx_work);
1578 
1579     local->rx_pending = NULL;
1580     INIT_WORK(&local->rx_work, nfc_llcp_rx_work);
1581 
1582     INIT_WORK(&local->timeout_work, nfc_llcp_timeout_work);
1583 
1584     rwlock_init(&local->sockets.lock);
1585     rwlock_init(&local->connecting_sockets.lock);
1586     rwlock_init(&local->raw_sockets.lock);
1587 
1588     local->lto = 150; /* 1500 ms */
1589     local->rw = LLCP_MAX_RW;
1590     local->miux = cpu_to_be16(LLCP_MAX_MIUX);
1591     local->local_wks = 0x1; /* LLC Link Management */
1592 
1593     nfc_llcp_build_gb(local);
1594 
1595     local->remote_miu = LLCP_DEFAULT_MIU;
1596     local->remote_lto = LLCP_DEFAULT_LTO;
1597 
1598     mutex_init(&local->sdreq_lock);
1599     INIT_HLIST_HEAD(&local->pending_sdreqs);
1600     timer_setup(&local->sdreq_timer, nfc_llcp_sdreq_timer, 0);
1601     INIT_WORK(&local->sdreq_timeout_work, nfc_llcp_sdreq_timeout_work);
1602 
1603     list_add(&local->list, &llcp_devices);
1604 
1605     return 0;
1606 }
1607 
1608 void nfc_llcp_unregister_device(struct nfc_dev *dev)
1609 {
1610     struct nfc_llcp_local *local = nfc_llcp_find_local(dev);
1611 
1612     if (local == NULL) {
1613         pr_debug("No such device\n");
1614         return;
1615     }
1616 
1617     local_cleanup(local);
1618 
1619     nfc_llcp_local_put(local);
1620 }
1621 
1622 int __init nfc_llcp_init(void)
1623 {
1624     return nfc_llcp_sock_init();
1625 }
1626 
1627 void nfc_llcp_exit(void)
1628 {
1629     nfc_llcp_sock_exit();
1630 }
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