Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1 | /* |
| 2 | * File: pep.c |
| 3 | * |
| 4 | * Phonet pipe protocol end point socket |
| 5 | * |
| 6 | * Copyright (C) 2008 Nokia Corporation. |
| 7 | * |
Rémi Denis-Courmont | 31fdc55 | 2012-06-13 22:29:03 +0000 | [diff] [blame] | 8 | * Author: Rémi Denis-Courmont |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 9 | * |
| 10 | * This program is free software; you can redistribute it and/or |
| 11 | * modify it under the terms of the GNU General Public License |
| 12 | * version 2 as published by the Free Software Foundation. |
| 13 | * |
| 14 | * This program is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA |
| 22 | * 02110-1301 USA |
| 23 | */ |
| 24 | |
| 25 | #include <linux/kernel.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 26 | #include <linux/slab.h> |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 27 | #include <linux/socket.h> |
| 28 | #include <net/sock.h> |
| 29 | #include <net/tcp_states.h> |
| 30 | #include <asm/ioctls.h> |
| 31 | |
| 32 | #include <linux/phonet.h> |
Paul Gortmaker | 3a9a231 | 2011-05-27 09:12:25 -0400 | [diff] [blame] | 33 | #include <linux/module.h> |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 34 | #include <net/phonet/phonet.h> |
| 35 | #include <net/phonet/pep.h> |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 36 | #include <net/phonet/gprs.h> |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 37 | |
| 38 | /* sk_state values: |
| 39 | * TCP_CLOSE sock not in use yet |
| 40 | * TCP_CLOSE_WAIT disconnected pipe |
| 41 | * TCP_LISTEN listening pipe endpoint |
| 42 | * TCP_SYN_RECV connected pipe in disabled state |
| 43 | * TCP_ESTABLISHED connected pipe in enabled state |
| 44 | * |
| 45 | * pep_sock locking: |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 46 | * - sk_state, hlist: sock lock needed |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 47 | * - listener: read only |
| 48 | * - pipe_handle: read only |
| 49 | */ |
| 50 | |
| 51 | #define CREDITS_MAX 10 |
| 52 | #define CREDITS_THR 7 |
| 53 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 54 | #define pep_sb_size(s) (((s) + 5) & ~3) /* 2-bytes head, 32-bits aligned */ |
| 55 | |
| 56 | /* Get the next TLV sub-block. */ |
| 57 | static unsigned char *pep_get_sb(struct sk_buff *skb, u8 *ptype, u8 *plen, |
| 58 | void *buf) |
| 59 | { |
| 60 | void *data = NULL; |
| 61 | struct { |
| 62 | u8 sb_type; |
| 63 | u8 sb_len; |
| 64 | } *ph, h; |
| 65 | int buflen = *plen; |
| 66 | |
| 67 | ph = skb_header_pointer(skb, 0, 2, &h); |
| 68 | if (ph == NULL || ph->sb_len < 2 || !pskb_may_pull(skb, ph->sb_len)) |
| 69 | return NULL; |
| 70 | ph->sb_len -= 2; |
| 71 | *ptype = ph->sb_type; |
| 72 | *plen = ph->sb_len; |
| 73 | |
| 74 | if (buflen > ph->sb_len) |
| 75 | buflen = ph->sb_len; |
| 76 | data = skb_header_pointer(skb, 2, buflen, buf); |
| 77 | __skb_pull(skb, 2 + ph->sb_len); |
| 78 | return data; |
| 79 | } |
| 80 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 81 | static struct sk_buff *pep_alloc_skb(struct sock *sk, const void *payload, |
| 82 | int len, gfp_t priority) |
| 83 | { |
| 84 | struct sk_buff *skb = alloc_skb(MAX_PNPIPE_HEADER + len, priority); |
| 85 | if (!skb) |
| 86 | return NULL; |
| 87 | skb_set_owner_w(skb, sk); |
| 88 | |
| 89 | skb_reserve(skb, MAX_PNPIPE_HEADER); |
| 90 | __skb_put(skb, len); |
| 91 | skb_copy_to_linear_data(skb, payload, len); |
| 92 | __skb_push(skb, sizeof(struct pnpipehdr)); |
| 93 | skb_reset_transport_header(skb); |
| 94 | return skb; |
| 95 | } |
| 96 | |
| 97 | static int pep_reply(struct sock *sk, struct sk_buff *oskb, u8 code, |
| 98 | const void *data, int len, gfp_t priority) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 99 | { |
| 100 | const struct pnpipehdr *oph = pnp_hdr(oskb); |
| 101 | struct pnpipehdr *ph; |
| 102 | struct sk_buff *skb; |
Rémi Denis-Courmont | 14ba8fa | 2011-02-24 23:14:58 +0000 | [diff] [blame] | 103 | struct sockaddr_pn peer; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 104 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 105 | skb = pep_alloc_skb(sk, data, len, priority); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 106 | if (!skb) |
| 107 | return -ENOMEM; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 108 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 109 | ph = pnp_hdr(skb); |
| 110 | ph->utid = oph->utid; |
| 111 | ph->message_id = oph->message_id + 1; /* REQ -> RESP */ |
| 112 | ph->pipe_handle = oph->pipe_handle; |
| 113 | ph->error_code = code; |
| 114 | |
Rémi Denis-Courmont | 14ba8fa | 2011-02-24 23:14:58 +0000 | [diff] [blame] | 115 | pn_skb_get_src_sockaddr(oskb, &peer); |
| 116 | return pn_skb_send(sk, skb, &peer); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 117 | } |
| 118 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 119 | static int pep_indicate(struct sock *sk, u8 id, u8 code, |
| 120 | const void *data, int len, gfp_t priority) |
| 121 | { |
| 122 | struct pep_sock *pn = pep_sk(sk); |
| 123 | struct pnpipehdr *ph; |
| 124 | struct sk_buff *skb; |
| 125 | |
| 126 | skb = pep_alloc_skb(sk, data, len, priority); |
| 127 | if (!skb) |
| 128 | return -ENOMEM; |
| 129 | |
| 130 | ph = pnp_hdr(skb); |
| 131 | ph->utid = 0; |
| 132 | ph->message_id = id; |
| 133 | ph->pipe_handle = pn->pipe_handle; |
| 134 | ph->data[0] = code; |
| 135 | return pn_skb_send(sk, skb, NULL); |
| 136 | } |
| 137 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 138 | #define PAD 0x00 |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 139 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 140 | static int pipe_handler_request(struct sock *sk, u8 id, u8 code, |
| 141 | const void *data, int len) |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 142 | { |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 143 | struct pep_sock *pn = pep_sk(sk); |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 144 | struct pnpipehdr *ph; |
| 145 | struct sk_buff *skb; |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 146 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 147 | skb = pep_alloc_skb(sk, data, len, GFP_KERNEL); |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 148 | if (!skb) |
| 149 | return -ENOMEM; |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 150 | |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 151 | ph = pnp_hdr(skb); |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 152 | ph->utid = id; /* whatever */ |
| 153 | ph->message_id = id; |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 154 | ph->pipe_handle = pn->pipe_handle; |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 155 | ph->data[0] = code; |
Rémi Denis-Courmont | 14ba8fa | 2011-02-24 23:14:58 +0000 | [diff] [blame] | 156 | return pn_skb_send(sk, skb, NULL); |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 157 | } |
| 158 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 159 | static int pipe_handler_send_created_ind(struct sock *sk) |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 160 | { |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 161 | struct pep_sock *pn = pep_sk(sk); |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 162 | u8 data[4] = { |
| 163 | PN_PIPE_SB_NEGOTIATED_FC, pep_sb_size(2), |
| 164 | pn->tx_fc, pn->rx_fc, |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 165 | }; |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 166 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 167 | return pep_indicate(sk, PNS_PIPE_CREATED_IND, 1 /* sub-blocks */, |
| 168 | data, 4, GFP_ATOMIC); |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 169 | } |
| 170 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 171 | static int pep_accept_conn(struct sock *sk, struct sk_buff *skb) |
| 172 | { |
| 173 | static const u8 data[20] = { |
| 174 | PAD, PAD, PAD, 2 /* sub-blocks */, |
| 175 | PN_PIPE_SB_REQUIRED_FC_TX, pep_sb_size(5), 3, PAD, |
| 176 | PN_MULTI_CREDIT_FLOW_CONTROL, |
| 177 | PN_ONE_CREDIT_FLOW_CONTROL, |
| 178 | PN_LEGACY_FLOW_CONTROL, |
| 179 | PAD, |
| 180 | PN_PIPE_SB_PREFERRED_FC_RX, pep_sb_size(5), 3, PAD, |
| 181 | PN_MULTI_CREDIT_FLOW_CONTROL, |
| 182 | PN_ONE_CREDIT_FLOW_CONTROL, |
| 183 | PN_LEGACY_FLOW_CONTROL, |
| 184 | PAD, |
| 185 | }; |
| 186 | |
| 187 | might_sleep(); |
| 188 | return pep_reply(sk, skb, PN_PIPE_NO_ERROR, data, sizeof(data), |
| 189 | GFP_KERNEL); |
| 190 | } |
| 191 | |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 192 | static int pep_reject_conn(struct sock *sk, struct sk_buff *skb, u8 code, |
| 193 | gfp_t priority) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 194 | { |
| 195 | static const u8 data[4] = { PAD, PAD, PAD, 0 /* sub-blocks */ }; |
| 196 | WARN_ON(code == PN_PIPE_NO_ERROR); |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 197 | return pep_reply(sk, skb, code, data, sizeof(data), priority); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 198 | } |
| 199 | |
| 200 | /* Control requests are not sent by the pipe service and have a specific |
| 201 | * message format. */ |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 202 | static int pep_ctrlreq_error(struct sock *sk, struct sk_buff *oskb, u8 code, |
| 203 | gfp_t priority) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 204 | { |
| 205 | const struct pnpipehdr *oph = pnp_hdr(oskb); |
| 206 | struct sk_buff *skb; |
| 207 | struct pnpipehdr *ph; |
| 208 | struct sockaddr_pn dst; |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 209 | u8 data[4] = { |
| 210 | oph->data[0], /* PEP type */ |
| 211 | code, /* error code, at an unusual offset */ |
| 212 | PAD, PAD, |
| 213 | }; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 214 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 215 | skb = pep_alloc_skb(sk, data, 4, priority); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 216 | if (!skb) |
| 217 | return -ENOMEM; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 218 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 219 | ph = pnp_hdr(skb); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 220 | ph->utid = oph->utid; |
| 221 | ph->message_id = PNS_PEP_CTRL_RESP; |
| 222 | ph->pipe_handle = oph->pipe_handle; |
| 223 | ph->data[0] = oph->data[1]; /* CTRL id */ |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 224 | |
| 225 | pn_skb_get_src_sockaddr(oskb, &dst); |
| 226 | return pn_skb_send(sk, skb, &dst); |
| 227 | } |
| 228 | |
| 229 | static int pipe_snd_status(struct sock *sk, u8 type, u8 status, gfp_t priority) |
| 230 | { |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 231 | u8 data[4] = { type, PAD, PAD, status }; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 232 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 233 | return pep_indicate(sk, PNS_PEP_STATUS_IND, PN_PEP_TYPE_COMMON, |
| 234 | data, 4, priority); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 235 | } |
| 236 | |
| 237 | /* Send our RX flow control information to the sender. |
| 238 | * Socket must be locked. */ |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 239 | static void pipe_grant_credits(struct sock *sk, gfp_t priority) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 240 | { |
| 241 | struct pep_sock *pn = pep_sk(sk); |
| 242 | |
| 243 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); |
| 244 | |
| 245 | switch (pn->rx_fc) { |
| 246 | case PN_LEGACY_FLOW_CONTROL: /* TODO */ |
| 247 | break; |
| 248 | case PN_ONE_CREDIT_FLOW_CONTROL: |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 249 | if (pipe_snd_status(sk, PN_PEP_IND_FLOW_CONTROL, |
| 250 | PEP_IND_READY, priority) == 0) |
| 251 | pn->rx_credits = 1; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 252 | break; |
| 253 | case PN_MULTI_CREDIT_FLOW_CONTROL: |
| 254 | if ((pn->rx_credits + CREDITS_THR) > CREDITS_MAX) |
| 255 | break; |
| 256 | if (pipe_snd_status(sk, PN_PEP_IND_ID_MCFC_GRANT_CREDITS, |
| 257 | CREDITS_MAX - pn->rx_credits, |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 258 | priority) == 0) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 259 | pn->rx_credits = CREDITS_MAX; |
| 260 | break; |
| 261 | } |
| 262 | } |
| 263 | |
| 264 | static int pipe_rcv_status(struct sock *sk, struct sk_buff *skb) |
| 265 | { |
| 266 | struct pep_sock *pn = pep_sk(sk); |
Kumar Sanghvi | a91e7d4 | 2010-09-27 23:10:42 +0000 | [diff] [blame] | 267 | struct pnpipehdr *hdr; |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 268 | int wake = 0; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 269 | |
| 270 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) |
| 271 | return -EINVAL; |
| 272 | |
Kumar Sanghvi | a91e7d4 | 2010-09-27 23:10:42 +0000 | [diff] [blame] | 273 | hdr = pnp_hdr(skb); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 274 | if (hdr->data[0] != PN_PEP_TYPE_COMMON) { |
| 275 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP type: %u\n", |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 276 | (unsigned int)hdr->data[0]); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 277 | return -EOPNOTSUPP; |
| 278 | } |
| 279 | |
| 280 | switch (hdr->data[1]) { |
| 281 | case PN_PEP_IND_FLOW_CONTROL: |
| 282 | switch (pn->tx_fc) { |
| 283 | case PN_LEGACY_FLOW_CONTROL: |
| 284 | switch (hdr->data[4]) { |
| 285 | case PEP_IND_BUSY: |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 286 | atomic_set(&pn->tx_credits, 0); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 287 | break; |
| 288 | case PEP_IND_READY: |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 289 | atomic_set(&pn->tx_credits, wake = 1); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 290 | break; |
| 291 | } |
| 292 | break; |
| 293 | case PN_ONE_CREDIT_FLOW_CONTROL: |
| 294 | if (hdr->data[4] == PEP_IND_READY) |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 295 | atomic_set(&pn->tx_credits, wake = 1); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 296 | break; |
| 297 | } |
| 298 | break; |
| 299 | |
| 300 | case PN_PEP_IND_ID_MCFC_GRANT_CREDITS: |
| 301 | if (pn->tx_fc != PN_MULTI_CREDIT_FLOW_CONTROL) |
| 302 | break; |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 303 | atomic_add(wake = hdr->data[4], &pn->tx_credits); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 304 | break; |
| 305 | |
| 306 | default: |
| 307 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP indication: %u\n", |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 308 | (unsigned int)hdr->data[1]); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 309 | return -EOPNOTSUPP; |
| 310 | } |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 311 | if (wake) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 312 | sk->sk_write_space(sk); |
| 313 | return 0; |
| 314 | } |
| 315 | |
| 316 | static int pipe_rcv_created(struct sock *sk, struct sk_buff *skb) |
| 317 | { |
| 318 | struct pep_sock *pn = pep_sk(sk); |
| 319 | struct pnpipehdr *hdr = pnp_hdr(skb); |
| 320 | u8 n_sb = hdr->data[0]; |
| 321 | |
| 322 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
| 323 | __skb_pull(skb, sizeof(*hdr)); |
| 324 | while (n_sb > 0) { |
| 325 | u8 type, buf[2], len = sizeof(buf); |
| 326 | u8 *data = pep_get_sb(skb, &type, &len, buf); |
| 327 | |
| 328 | if (data == NULL) |
| 329 | return -EINVAL; |
| 330 | switch (type) { |
| 331 | case PN_PIPE_SB_NEGOTIATED_FC: |
| 332 | if (len < 2 || (data[0] | data[1]) > 3) |
| 333 | break; |
| 334 | pn->tx_fc = data[0] & 3; |
| 335 | pn->rx_fc = data[1] & 3; |
| 336 | break; |
| 337 | } |
| 338 | n_sb--; |
| 339 | } |
| 340 | return 0; |
| 341 | } |
| 342 | |
| 343 | /* Queue an skb to a connected sock. |
| 344 | * Socket lock must be held. */ |
| 345 | static int pipe_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 346 | { |
| 347 | struct pep_sock *pn = pep_sk(sk); |
| 348 | struct pnpipehdr *hdr = pnp_hdr(skb); |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 349 | struct sk_buff_head *queue; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 350 | int err = 0; |
| 351 | |
| 352 | BUG_ON(sk->sk_state == TCP_CLOSE_WAIT); |
| 353 | |
| 354 | switch (hdr->message_id) { |
| 355 | case PNS_PEP_CONNECT_REQ: |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 356 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_ATOMIC); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 357 | break; |
| 358 | |
| 359 | case PNS_PEP_DISCONNECT_REQ: |
| 360 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
| 361 | sk->sk_state = TCP_CLOSE_WAIT; |
| 362 | if (!sock_flag(sk, SOCK_DEAD)) |
| 363 | sk->sk_state_change(sk); |
| 364 | break; |
| 365 | |
| 366 | case PNS_PEP_ENABLE_REQ: |
| 367 | /* Wait for PNS_PIPE_(ENABLED|REDIRECTED)_IND */ |
| 368 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
| 369 | break; |
| 370 | |
| 371 | case PNS_PEP_RESET_REQ: |
| 372 | switch (hdr->state_after_reset) { |
| 373 | case PN_PIPE_DISABLE: |
| 374 | pn->init_enable = 0; |
| 375 | break; |
| 376 | case PN_PIPE_ENABLE: |
| 377 | pn->init_enable = 1; |
| 378 | break; |
| 379 | default: /* not allowed to send an error here!? */ |
| 380 | err = -EINVAL; |
| 381 | goto out; |
| 382 | } |
| 383 | /* fall through */ |
| 384 | case PNS_PEP_DISABLE_REQ: |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 385 | atomic_set(&pn->tx_credits, 0); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 386 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
| 387 | break; |
| 388 | |
| 389 | case PNS_PEP_CTRL_REQ: |
Rémi Denis-Courmont | 2e2fb4b | 2009-07-21 01:57:59 +0000 | [diff] [blame] | 390 | if (skb_queue_len(&pn->ctrlreq_queue) >= PNPIPE_CTRLREQ_MAX) { |
| 391 | atomic_inc(&sk->sk_drops); |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 392 | break; |
Rémi Denis-Courmont | 2e2fb4b | 2009-07-21 01:57:59 +0000 | [diff] [blame] | 393 | } |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 394 | __skb_pull(skb, 4); |
| 395 | queue = &pn->ctrlreq_queue; |
| 396 | goto queue; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 397 | |
Rémi Denis-Courmont | fc6a110 | 2010-01-04 02:02:47 +0000 | [diff] [blame] | 398 | case PNS_PIPE_ALIGNED_DATA: |
| 399 | __skb_pull(skb, 1); |
| 400 | /* fall through */ |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 401 | case PNS_PIPE_DATA: |
| 402 | __skb_pull(skb, 3); /* Pipe data header */ |
| 403 | if (!pn_flow_safe(pn->rx_fc)) { |
| 404 | err = sock_queue_rcv_skb(sk, skb); |
| 405 | if (!err) |
Rémi Denis-Courmont | 0ebbf31 | 2011-03-08 22:44:08 +0000 | [diff] [blame] | 406 | return NET_RX_SUCCESS; |
| 407 | err = -ENOBUFS; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 408 | break; |
| 409 | } |
| 410 | |
| 411 | if (pn->rx_credits == 0) { |
Rémi Denis-Courmont | 2e2fb4b | 2009-07-21 01:57:59 +0000 | [diff] [blame] | 412 | atomic_inc(&sk->sk_drops); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 413 | err = -ENOBUFS; |
| 414 | break; |
| 415 | } |
| 416 | pn->rx_credits--; |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 417 | queue = &sk->sk_receive_queue; |
| 418 | goto queue; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 419 | |
| 420 | case PNS_PEP_STATUS_IND: |
| 421 | pipe_rcv_status(sk, skb); |
| 422 | break; |
| 423 | |
| 424 | case PNS_PIPE_REDIRECTED_IND: |
| 425 | err = pipe_rcv_created(sk, skb); |
| 426 | break; |
| 427 | |
| 428 | case PNS_PIPE_CREATED_IND: |
| 429 | err = pipe_rcv_created(sk, skb); |
| 430 | if (err) |
| 431 | break; |
| 432 | /* fall through */ |
| 433 | case PNS_PIPE_RESET_IND: |
| 434 | if (!pn->init_enable) |
| 435 | break; |
| 436 | /* fall through */ |
| 437 | case PNS_PIPE_ENABLED_IND: |
| 438 | if (!pn_flow_safe(pn->tx_fc)) { |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 439 | atomic_set(&pn->tx_credits, 1); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 440 | sk->sk_write_space(sk); |
| 441 | } |
| 442 | if (sk->sk_state == TCP_ESTABLISHED) |
| 443 | break; /* Nothing to do */ |
| 444 | sk->sk_state = TCP_ESTABLISHED; |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 445 | pipe_grant_credits(sk, GFP_ATOMIC); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 446 | break; |
| 447 | |
| 448 | case PNS_PIPE_DISABLED_IND: |
| 449 | sk->sk_state = TCP_SYN_RECV; |
| 450 | pn->rx_credits = 0; |
| 451 | break; |
| 452 | |
| 453 | default: |
| 454 | LIMIT_NETDEBUG(KERN_DEBUG"Phonet unknown PEP message: %u\n", |
| 455 | hdr->message_id); |
| 456 | err = -EINVAL; |
| 457 | } |
| 458 | out: |
| 459 | kfree_skb(skb); |
Rémi Denis-Courmont | 0ebbf31 | 2011-03-08 22:44:08 +0000 | [diff] [blame] | 460 | return (err == -ENOBUFS) ? NET_RX_DROP : NET_RX_SUCCESS; |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 461 | |
| 462 | queue: |
| 463 | skb->dev = NULL; |
| 464 | skb_set_owner_r(skb, sk); |
| 465 | err = skb->len; |
| 466 | skb_queue_tail(queue, skb); |
| 467 | if (!sock_flag(sk, SOCK_DEAD)) |
| 468 | sk->sk_data_ready(sk, err); |
Rémi Denis-Courmont | 0ebbf31 | 2011-03-08 22:44:08 +0000 | [diff] [blame] | 469 | return NET_RX_SUCCESS; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 470 | } |
| 471 | |
| 472 | /* Destroy connected sock. */ |
| 473 | static void pipe_destruct(struct sock *sk) |
| 474 | { |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 475 | struct pep_sock *pn = pep_sk(sk); |
| 476 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 477 | skb_queue_purge(&sk->sk_receive_queue); |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 478 | skb_queue_purge(&pn->ctrlreq_queue); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 481 | static u8 pipe_negotiate_fc(const u8 *fcs, unsigned int n) |
Rémi Denis-Courmont | 8f44fcc | 2011-02-24 23:15:01 +0000 | [diff] [blame] | 482 | { |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 483 | unsigned int i; |
Rémi Denis-Courmont | 8f44fcc | 2011-02-24 23:15:01 +0000 | [diff] [blame] | 484 | u8 final_fc = PN_NO_FLOW_CONTROL; |
| 485 | |
| 486 | for (i = 0; i < n; i++) { |
| 487 | u8 fc = fcs[i]; |
| 488 | |
| 489 | if (fc > final_fc && fc < PN_MAX_FLOW_CONTROL) |
| 490 | final_fc = fc; |
| 491 | } |
| 492 | return final_fc; |
| 493 | } |
| 494 | |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 495 | static int pep_connresp_rcv(struct sock *sk, struct sk_buff *skb) |
| 496 | { |
| 497 | struct pep_sock *pn = pep_sk(sk); |
Rémi Denis-Courmont | 8f44fcc | 2011-02-24 23:15:01 +0000 | [diff] [blame] | 498 | struct pnpipehdr *hdr; |
| 499 | u8 n_sb; |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 500 | |
Rémi Denis-Courmont | 8f44fcc | 2011-02-24 23:15:01 +0000 | [diff] [blame] | 501 | if (!pskb_pull(skb, sizeof(*hdr) + 4)) |
| 502 | return -EINVAL; |
| 503 | |
| 504 | hdr = pnp_hdr(skb); |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 505 | if (hdr->error_code != PN_PIPE_NO_ERROR) |
| 506 | return -ECONNREFUSED; |
Rémi Denis-Courmont | 8f44fcc | 2011-02-24 23:15:01 +0000 | [diff] [blame] | 507 | |
| 508 | /* Parse sub-blocks */ |
| 509 | n_sb = hdr->data[4]; |
| 510 | while (n_sb > 0) { |
| 511 | u8 type, buf[6], len = sizeof(buf); |
| 512 | const u8 *data = pep_get_sb(skb, &type, &len, buf); |
| 513 | |
| 514 | if (data == NULL) |
| 515 | return -EINVAL; |
| 516 | |
| 517 | switch (type) { |
| 518 | case PN_PIPE_SB_REQUIRED_FC_TX: |
| 519 | if (len < 2 || len < data[0]) |
| 520 | break; |
| 521 | pn->tx_fc = pipe_negotiate_fc(data + 2, len - 2); |
| 522 | break; |
| 523 | |
| 524 | case PN_PIPE_SB_PREFERRED_FC_RX: |
| 525 | if (len < 2 || len < data[0]) |
| 526 | break; |
| 527 | pn->rx_fc = pipe_negotiate_fc(data + 2, len - 2); |
| 528 | break; |
| 529 | |
| 530 | } |
| 531 | n_sb--; |
| 532 | } |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 533 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 534 | return pipe_handler_send_created_ind(sk); |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 535 | } |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 536 | |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 537 | static int pep_enableresp_rcv(struct sock *sk, struct sk_buff *skb) |
| 538 | { |
| 539 | struct pnpipehdr *hdr = pnp_hdr(skb); |
| 540 | |
| 541 | if (hdr->error_code != PN_PIPE_NO_ERROR) |
| 542 | return -ECONNREFUSED; |
| 543 | |
| 544 | return pep_indicate(sk, PNS_PIPE_ENABLED_IND, 0 /* sub-blocks */, |
| 545 | NULL, 0, GFP_ATOMIC); |
| 546 | |
| 547 | } |
| 548 | |
| 549 | static void pipe_start_flow_control(struct sock *sk) |
| 550 | { |
| 551 | struct pep_sock *pn = pep_sk(sk); |
| 552 | |
| 553 | if (!pn_flow_safe(pn->tx_fc)) { |
| 554 | atomic_set(&pn->tx_credits, 1); |
| 555 | sk->sk_write_space(sk); |
| 556 | } |
| 557 | pipe_grant_credits(sk, GFP_ATOMIC); |
| 558 | } |
| 559 | |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 560 | /* Queue an skb to an actively connected sock. |
| 561 | * Socket lock must be held. */ |
| 562 | static int pipe_handler_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 563 | { |
| 564 | struct pep_sock *pn = pep_sk(sk); |
| 565 | struct pnpipehdr *hdr = pnp_hdr(skb); |
| 566 | int err = NET_RX_SUCCESS; |
| 567 | |
| 568 | switch (hdr->message_id) { |
| 569 | case PNS_PIPE_ALIGNED_DATA: |
| 570 | __skb_pull(skb, 1); |
| 571 | /* fall through */ |
| 572 | case PNS_PIPE_DATA: |
| 573 | __skb_pull(skb, 3); /* Pipe data header */ |
| 574 | if (!pn_flow_safe(pn->rx_fc)) { |
| 575 | err = sock_queue_rcv_skb(sk, skb); |
| 576 | if (!err) |
| 577 | return NET_RX_SUCCESS; |
| 578 | err = NET_RX_DROP; |
| 579 | break; |
| 580 | } |
| 581 | |
| 582 | if (pn->rx_credits == 0) { |
| 583 | atomic_inc(&sk->sk_drops); |
| 584 | err = NET_RX_DROP; |
| 585 | break; |
| 586 | } |
| 587 | pn->rx_credits--; |
| 588 | skb->dev = NULL; |
| 589 | skb_set_owner_r(skb, sk); |
| 590 | err = skb->len; |
| 591 | skb_queue_tail(&sk->sk_receive_queue, skb); |
| 592 | if (!sock_flag(sk, SOCK_DEAD)) |
| 593 | sk->sk_data_ready(sk, err); |
| 594 | return NET_RX_SUCCESS; |
| 595 | |
| 596 | case PNS_PEP_CONNECT_RESP: |
| 597 | if (sk->sk_state != TCP_SYN_SENT) |
| 598 | break; |
| 599 | if (!sock_flag(sk, SOCK_DEAD)) |
| 600 | sk->sk_state_change(sk); |
| 601 | if (pep_connresp_rcv(sk, skb)) { |
| 602 | sk->sk_state = TCP_CLOSE_WAIT; |
| 603 | break; |
| 604 | } |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 605 | if (pn->init_enable == PN_PIPE_DISABLE) |
| 606 | sk->sk_state = TCP_SYN_RECV; |
| 607 | else { |
| 608 | sk->sk_state = TCP_ESTABLISHED; |
| 609 | pipe_start_flow_control(sk); |
| 610 | } |
| 611 | break; |
| 612 | |
| 613 | case PNS_PEP_ENABLE_RESP: |
| 614 | if (sk->sk_state != TCP_SYN_SENT) |
| 615 | break; |
| 616 | |
| 617 | if (pep_enableresp_rcv(sk, skb)) { |
| 618 | sk->sk_state = TCP_CLOSE_WAIT; |
| 619 | break; |
| 620 | } |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 621 | |
| 622 | sk->sk_state = TCP_ESTABLISHED; |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 623 | pipe_start_flow_control(sk); |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 624 | break; |
| 625 | |
| 626 | case PNS_PEP_DISCONNECT_RESP: |
| 627 | /* sock should already be dead, nothing to do */ |
| 628 | break; |
| 629 | |
| 630 | case PNS_PEP_STATUS_IND: |
| 631 | pipe_rcv_status(sk, skb); |
| 632 | break; |
| 633 | } |
| 634 | kfree_skb(skb); |
| 635 | return err; |
| 636 | } |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 637 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 638 | /* Listening sock must be locked */ |
| 639 | static struct sock *pep_find_pipe(const struct hlist_head *hlist, |
| 640 | const struct sockaddr_pn *dst, |
| 641 | u8 pipe_handle) |
| 642 | { |
| 643 | struct hlist_node *node; |
| 644 | struct sock *sknode; |
| 645 | u16 dobj = pn_sockaddr_get_object(dst); |
| 646 | |
| 647 | sk_for_each(sknode, node, hlist) { |
| 648 | struct pep_sock *pnnode = pep_sk(sknode); |
| 649 | |
| 650 | /* Ports match, but addresses might not: */ |
| 651 | if (pnnode->pn_sk.sobject != dobj) |
| 652 | continue; |
| 653 | if (pnnode->pipe_handle != pipe_handle) |
| 654 | continue; |
| 655 | if (sknode->sk_state == TCP_CLOSE_WAIT) |
| 656 | continue; |
| 657 | |
| 658 | sock_hold(sknode); |
| 659 | return sknode; |
| 660 | } |
| 661 | return NULL; |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * Deliver an skb to a listening sock. |
| 666 | * Socket lock must be held. |
| 667 | * We then queue the skb to the right connected sock (if any). |
| 668 | */ |
| 669 | static int pep_do_rcv(struct sock *sk, struct sk_buff *skb) |
| 670 | { |
| 671 | struct pep_sock *pn = pep_sk(sk); |
| 672 | struct sock *sknode; |
Rémi Denis-Courmont | 2ddc1ac | 2009-02-10 17:14:50 -0800 | [diff] [blame] | 673 | struct pnpipehdr *hdr; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 674 | struct sockaddr_pn dst; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 675 | u8 pipe_handle; |
| 676 | |
| 677 | if (!pskb_may_pull(skb, sizeof(*hdr))) |
| 678 | goto drop; |
| 679 | |
| 680 | hdr = pnp_hdr(skb); |
| 681 | pipe_handle = hdr->pipe_handle; |
| 682 | if (pipe_handle == PN_PIPE_INVALID_HANDLE) |
| 683 | goto drop; |
| 684 | |
| 685 | pn_skb_get_dst_sockaddr(skb, &dst); |
| 686 | |
| 687 | /* Look for an existing pipe handle */ |
| 688 | sknode = pep_find_pipe(&pn->hlist, &dst, pipe_handle); |
| 689 | if (sknode) |
| 690 | return sk_receive_skb(sknode, skb, 1); |
| 691 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 692 | switch (hdr->message_id) { |
| 693 | case PNS_PEP_CONNECT_REQ: |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 694 | if (sk->sk_state != TCP_LISTEN || sk_acceptq_is_full(sk)) { |
| 695 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, |
| 696 | GFP_ATOMIC); |
| 697 | break; |
| 698 | } |
| 699 | skb_queue_head(&sk->sk_receive_queue, skb); |
| 700 | sk_acceptq_added(sk); |
| 701 | if (!sock_flag(sk, SOCK_DEAD)) |
| 702 | sk->sk_data_ready(sk, 0); |
| 703 | return NET_RX_SUCCESS; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 704 | |
| 705 | case PNS_PEP_DISCONNECT_REQ: |
| 706 | pep_reply(sk, skb, PN_PIPE_NO_ERROR, NULL, 0, GFP_ATOMIC); |
| 707 | break; |
| 708 | |
| 709 | case PNS_PEP_CTRL_REQ: |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 710 | pep_ctrlreq_error(sk, skb, PN_PIPE_INVALID_HANDLE, GFP_ATOMIC); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 711 | break; |
| 712 | |
| 713 | case PNS_PEP_RESET_REQ: |
| 714 | case PNS_PEP_ENABLE_REQ: |
| 715 | case PNS_PEP_DISABLE_REQ: |
| 716 | /* invalid handle is not even allowed here! */ |
Rémi Denis-Courmont | 0ebbf31 | 2011-03-08 22:44:08 +0000 | [diff] [blame] | 717 | break; |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 718 | |
| 719 | default: |
| 720 | if ((1 << sk->sk_state) |
| 721 | & ~(TCPF_CLOSE|TCPF_LISTEN|TCPF_CLOSE_WAIT)) |
| 722 | /* actively connected socket */ |
| 723 | return pipe_handler_do_rcv(sk, skb); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 724 | } |
| 725 | drop: |
| 726 | kfree_skb(skb); |
Rémi Denis-Courmont | 0ebbf31 | 2011-03-08 22:44:08 +0000 | [diff] [blame] | 727 | return NET_RX_SUCCESS; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 728 | } |
| 729 | |
Rémi Denis-Courmont | 6482f55 | 2010-09-15 12:19:53 +0000 | [diff] [blame] | 730 | static int pipe_do_remove(struct sock *sk) |
| 731 | { |
| 732 | struct pep_sock *pn = pep_sk(sk); |
| 733 | struct pnpipehdr *ph; |
| 734 | struct sk_buff *skb; |
| 735 | |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 736 | skb = pep_alloc_skb(sk, NULL, 0, GFP_KERNEL); |
Rémi Denis-Courmont | 6482f55 | 2010-09-15 12:19:53 +0000 | [diff] [blame] | 737 | if (!skb) |
| 738 | return -ENOMEM; |
| 739 | |
Rémi Denis-Courmont | 6482f55 | 2010-09-15 12:19:53 +0000 | [diff] [blame] | 740 | ph = pnp_hdr(skb); |
| 741 | ph->utid = 0; |
| 742 | ph->message_id = PNS_PIPE_REMOVE_REQ; |
| 743 | ph->pipe_handle = pn->pipe_handle; |
| 744 | ph->data[0] = PAD; |
Rémi Denis-Courmont | 14ba8fa | 2011-02-24 23:14:58 +0000 | [diff] [blame] | 745 | return pn_skb_send(sk, skb, NULL); |
Rémi Denis-Courmont | 6482f55 | 2010-09-15 12:19:53 +0000 | [diff] [blame] | 746 | } |
| 747 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 748 | /* associated socket ceases to exist */ |
| 749 | static void pep_sock_close(struct sock *sk, long timeout) |
| 750 | { |
| 751 | struct pep_sock *pn = pep_sk(sk); |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 752 | int ifindex = 0; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 753 | |
Rémi Denis-Courmont | e513480 | 2010-05-25 16:08:39 -0700 | [diff] [blame] | 754 | sock_hold(sk); /* keep a reference after sk_common_release() */ |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 755 | sk_common_release(sk); |
| 756 | |
| 757 | lock_sock(sk); |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 758 | if ((1 << sk->sk_state) & (TCPF_SYN_RECV|TCPF_ESTABLISHED)) { |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 759 | if (sk->sk_backlog_rcv == pipe_do_rcv) |
| 760 | /* Forcefully remove dangling Phonet pipe */ |
| 761 | pipe_do_remove(sk); |
| 762 | else |
| 763 | pipe_handler_request(sk, PNS_PEP_DISCONNECT_REQ, PAD, |
| 764 | NULL, 0); |
Rémi Denis-Courmont | 2feb618 | 2011-02-24 23:14:59 +0000 | [diff] [blame] | 765 | } |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 766 | sk->sk_state = TCP_CLOSE; |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 767 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 768 | ifindex = pn->ifindex; |
| 769 | pn->ifindex = 0; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 770 | release_sock(sk); |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 771 | |
| 772 | if (ifindex) |
| 773 | gprs_detach(sk); |
Rémi Denis-Courmont | e513480 | 2010-05-25 16:08:39 -0700 | [diff] [blame] | 774 | sock_put(sk); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 775 | } |
| 776 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 777 | static struct sock *pep_sock_accept(struct sock *sk, int flags, int *errp) |
| 778 | { |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 779 | struct pep_sock *pn = pep_sk(sk), *newpn; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 780 | struct sock *newsk = NULL; |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 781 | struct sk_buff *skb; |
| 782 | struct pnpipehdr *hdr; |
| 783 | struct sockaddr_pn dst, src; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 784 | int err; |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 785 | u16 peer_type; |
| 786 | u8 pipe_handle, enabled, n_sb; |
| 787 | u8 aligned = 0; |
| 788 | |
| 789 | skb = skb_recv_datagram(sk, 0, flags & O_NONBLOCK, errp); |
| 790 | if (!skb) |
| 791 | return NULL; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 792 | |
| 793 | lock_sock(sk); |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 794 | if (sk->sk_state != TCP_LISTEN) { |
| 795 | err = -EINVAL; |
| 796 | goto drop; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 797 | } |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 798 | sk_acceptq_removed(sk); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 799 | |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 800 | err = -EPROTO; |
| 801 | if (!pskb_may_pull(skb, sizeof(*hdr) + 4)) |
| 802 | goto drop; |
| 803 | |
| 804 | hdr = pnp_hdr(skb); |
| 805 | pipe_handle = hdr->pipe_handle; |
| 806 | switch (hdr->state_after_connect) { |
| 807 | case PN_PIPE_DISABLE: |
| 808 | enabled = 0; |
| 809 | break; |
| 810 | case PN_PIPE_ENABLE: |
| 811 | enabled = 1; |
| 812 | break; |
| 813 | default: |
| 814 | pep_reject_conn(sk, skb, PN_PIPE_ERR_INVALID_PARAM, |
| 815 | GFP_KERNEL); |
| 816 | goto drop; |
| 817 | } |
| 818 | peer_type = hdr->other_pep_type << 8; |
| 819 | |
| 820 | /* Parse sub-blocks (options) */ |
| 821 | n_sb = hdr->data[4]; |
| 822 | while (n_sb > 0) { |
| 823 | u8 type, buf[1], len = sizeof(buf); |
| 824 | const u8 *data = pep_get_sb(skb, &type, &len, buf); |
| 825 | |
| 826 | if (data == NULL) |
| 827 | goto drop; |
| 828 | switch (type) { |
| 829 | case PN_PIPE_SB_CONNECT_REQ_PEP_SUB_TYPE: |
| 830 | if (len < 1) |
| 831 | goto drop; |
| 832 | peer_type = (peer_type & 0xff00) | data[0]; |
| 833 | break; |
| 834 | case PN_PIPE_SB_ALIGNED_DATA: |
| 835 | aligned = data[0] != 0; |
| 836 | break; |
| 837 | } |
| 838 | n_sb--; |
| 839 | } |
| 840 | |
| 841 | /* Check for duplicate pipe handle */ |
| 842 | newsk = pep_find_pipe(&pn->hlist, &dst, pipe_handle); |
| 843 | if (unlikely(newsk)) { |
| 844 | __sock_put(newsk); |
| 845 | newsk = NULL; |
| 846 | pep_reject_conn(sk, skb, PN_PIPE_ERR_PEP_IN_USE, GFP_KERNEL); |
| 847 | goto drop; |
| 848 | } |
| 849 | |
| 850 | /* Create a new to-be-accepted sock */ |
| 851 | newsk = sk_alloc(sock_net(sk), PF_PHONET, GFP_KERNEL, sk->sk_prot); |
| 852 | if (!newsk) { |
| 853 | pep_reject_conn(sk, skb, PN_PIPE_ERR_OVERLOAD, GFP_KERNEL); |
| 854 | err = -ENOBUFS; |
| 855 | goto drop; |
| 856 | } |
| 857 | |
| 858 | sock_init_data(NULL, newsk); |
| 859 | newsk->sk_state = TCP_SYN_RECV; |
| 860 | newsk->sk_backlog_rcv = pipe_do_rcv; |
| 861 | newsk->sk_protocol = sk->sk_protocol; |
| 862 | newsk->sk_destruct = pipe_destruct; |
| 863 | |
| 864 | newpn = pep_sk(newsk); |
| 865 | pn_skb_get_dst_sockaddr(skb, &dst); |
| 866 | pn_skb_get_src_sockaddr(skb, &src); |
| 867 | newpn->pn_sk.sobject = pn_sockaddr_get_object(&dst); |
| 868 | newpn->pn_sk.dobject = pn_sockaddr_get_object(&src); |
| 869 | newpn->pn_sk.resource = pn_sockaddr_get_resource(&dst); |
| 870 | sock_hold(sk); |
| 871 | newpn->listener = sk; |
| 872 | skb_queue_head_init(&newpn->ctrlreq_queue); |
| 873 | newpn->pipe_handle = pipe_handle; |
| 874 | atomic_set(&newpn->tx_credits, 0); |
| 875 | newpn->ifindex = 0; |
| 876 | newpn->peer_type = peer_type; |
| 877 | newpn->rx_credits = 0; |
| 878 | newpn->rx_fc = newpn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
| 879 | newpn->init_enable = enabled; |
| 880 | newpn->aligned = aligned; |
| 881 | |
| 882 | err = pep_accept_conn(newsk, skb); |
| 883 | if (err) { |
| 884 | sock_put(newsk); |
| 885 | newsk = NULL; |
| 886 | goto drop; |
| 887 | } |
| 888 | sk_add_node(newsk, &pn->hlist); |
| 889 | drop: |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 890 | release_sock(sk); |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 891 | kfree_skb(skb); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 892 | *errp = err; |
| 893 | return newsk; |
| 894 | } |
| 895 | |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 896 | static int pep_sock_connect(struct sock *sk, struct sockaddr *addr, int len) |
| 897 | { |
| 898 | struct pep_sock *pn = pep_sk(sk); |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 899 | int err; |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 900 | u8 data[4] = { 0 /* sub-blocks */, PAD, PAD, PAD }; |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 901 | |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 902 | if (pn->pipe_handle == PN_PIPE_INVALID_HANDLE) |
| 903 | pn->pipe_handle = 1; /* anything but INVALID_HANDLE */ |
| 904 | |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 905 | err = pipe_handler_request(sk, PNS_PEP_CONNECT_REQ, |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 906 | pn->init_enable, data, 4); |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 907 | if (err) { |
| 908 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
| 909 | return err; |
| 910 | } |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 911 | |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 912 | sk->sk_state = TCP_SYN_SENT; |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 913 | |
| 914 | return 0; |
| 915 | } |
| 916 | |
| 917 | static int pep_sock_enable(struct sock *sk, struct sockaddr *addr, int len) |
| 918 | { |
| 919 | int err; |
| 920 | |
| 921 | err = pipe_handler_request(sk, PNS_PEP_ENABLE_REQ, PAD, |
| 922 | NULL, 0); |
| 923 | if (err) |
| 924 | return err; |
| 925 | |
| 926 | sk->sk_state = TCP_SYN_SENT; |
| 927 | |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 928 | return 0; |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 929 | } |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 930 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 931 | static int pep_ioctl(struct sock *sk, int cmd, unsigned long arg) |
| 932 | { |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 933 | struct pep_sock *pn = pep_sk(sk); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 934 | int answ; |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 935 | int ret = -ENOIOCTLCMD; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 936 | |
| 937 | switch (cmd) { |
| 938 | case SIOCINQ: |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 939 | if (sk->sk_state == TCP_LISTEN) { |
| 940 | ret = -EINVAL; |
| 941 | break; |
| 942 | } |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 943 | |
| 944 | lock_sock(sk); |
Joe Perches | f64f9e7 | 2009-11-29 16:55:45 -0800 | [diff] [blame] | 945 | if (sock_flag(sk, SOCK_URGINLINE) && |
| 946 | !skb_queue_empty(&pn->ctrlreq_queue)) |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 947 | answ = skb_peek(&pn->ctrlreq_queue)->len; |
| 948 | else if (!skb_queue_empty(&sk->sk_receive_queue)) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 949 | answ = skb_peek(&sk->sk_receive_queue)->len; |
| 950 | else |
| 951 | answ = 0; |
| 952 | release_sock(sk); |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 953 | ret = put_user(answ, (int __user *)arg); |
| 954 | break; |
| 955 | |
| 956 | case SIOCPNENABLEPIPE: |
| 957 | lock_sock(sk); |
| 958 | if (sk->sk_state == TCP_SYN_SENT) |
| 959 | ret = -EBUSY; |
| 960 | else if (sk->sk_state == TCP_ESTABLISHED) |
| 961 | ret = -EISCONN; |
| 962 | else |
| 963 | ret = pep_sock_enable(sk, NULL, 0); |
| 964 | release_sock(sk); |
| 965 | break; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 966 | } |
| 967 | |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 968 | return ret; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 969 | } |
| 970 | |
| 971 | static int pep_init(struct sock *sk) |
| 972 | { |
| 973 | struct pep_sock *pn = pep_sk(sk); |
| 974 | |
Rémi Denis-Courmont | f7ae8d5 | 2011-03-08 22:44:10 +0000 | [diff] [blame] | 975 | sk->sk_destruct = pipe_destruct; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 976 | INIT_HLIST_HEAD(&pn->hlist); |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 977 | pn->listener = NULL; |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 978 | skb_queue_head_init(&pn->ctrlreq_queue); |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 979 | atomic_set(&pn->tx_credits, 0); |
| 980 | pn->ifindex = 0; |
| 981 | pn->peer_type = 0; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 982 | pn->pipe_handle = PN_PIPE_INVALID_HANDLE; |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 983 | pn->rx_credits = 0; |
| 984 | pn->rx_fc = pn->tx_fc = PN_LEGACY_FLOW_CONTROL; |
| 985 | pn->init_enable = 1; |
| 986 | pn->aligned = 0; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 987 | return 0; |
| 988 | } |
| 989 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 990 | static int pep_setsockopt(struct sock *sk, int level, int optname, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 991 | char __user *optval, unsigned int optlen) |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 992 | { |
| 993 | struct pep_sock *pn = pep_sk(sk); |
| 994 | int val = 0, err = 0; |
| 995 | |
| 996 | if (level != SOL_PNPIPE) |
| 997 | return -ENOPROTOOPT; |
| 998 | if (optlen >= sizeof(int)) { |
| 999 | if (get_user(val, (int __user *) optval)) |
| 1000 | return -EFAULT; |
| 1001 | } |
| 1002 | |
| 1003 | lock_sock(sk); |
| 1004 | switch (optname) { |
| 1005 | case PNPIPE_ENCAP: |
| 1006 | if (val && val != PNPIPE_ENCAP_IP) { |
| 1007 | err = -EINVAL; |
| 1008 | break; |
| 1009 | } |
| 1010 | if (!pn->ifindex == !val) |
| 1011 | break; /* Nothing to do! */ |
| 1012 | if (!capable(CAP_NET_ADMIN)) { |
| 1013 | err = -EPERM; |
| 1014 | break; |
| 1015 | } |
| 1016 | if (val) { |
| 1017 | release_sock(sk); |
| 1018 | err = gprs_attach(sk); |
| 1019 | if (err > 0) { |
| 1020 | pn->ifindex = err; |
| 1021 | err = 0; |
| 1022 | } |
| 1023 | } else { |
| 1024 | pn->ifindex = 0; |
| 1025 | release_sock(sk); |
| 1026 | gprs_detach(sk); |
| 1027 | err = 0; |
| 1028 | } |
| 1029 | goto out_norel; |
Rémi Denis-Courmont | 03789f2 | 2010-10-08 04:02:02 +0000 | [diff] [blame] | 1030 | |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 1031 | case PNPIPE_HANDLE: |
| 1032 | if ((sk->sk_state == TCP_CLOSE) && |
| 1033 | (val >= 0) && (val < PN_PIPE_INVALID_HANDLE)) |
| 1034 | pn->pipe_handle = val; |
| 1035 | else |
| 1036 | err = -EINVAL; |
| 1037 | break; |
| 1038 | |
| 1039 | case PNPIPE_INITSTATE: |
| 1040 | pn->init_enable = !!val; |
| 1041 | break; |
| 1042 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1043 | default: |
| 1044 | err = -ENOPROTOOPT; |
| 1045 | } |
| 1046 | release_sock(sk); |
| 1047 | |
| 1048 | out_norel: |
| 1049 | return err; |
| 1050 | } |
| 1051 | |
| 1052 | static int pep_getsockopt(struct sock *sk, int level, int optname, |
| 1053 | char __user *optval, int __user *optlen) |
| 1054 | { |
| 1055 | struct pep_sock *pn = pep_sk(sk); |
| 1056 | int len, val; |
| 1057 | |
| 1058 | if (level != SOL_PNPIPE) |
| 1059 | return -ENOPROTOOPT; |
| 1060 | if (get_user(len, optlen)) |
| 1061 | return -EFAULT; |
| 1062 | |
| 1063 | switch (optname) { |
| 1064 | case PNPIPE_ENCAP: |
| 1065 | val = pn->ifindex ? PNPIPE_ENCAP_IP : PNPIPE_ENCAP_NONE; |
| 1066 | break; |
Kumar Sanghvi | 8d98efa | 2010-09-26 19:07:59 +0000 | [diff] [blame] | 1067 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1068 | case PNPIPE_IFINDEX: |
| 1069 | val = pn->ifindex; |
| 1070 | break; |
Rémi Denis-Courmont | 03789f2 | 2010-10-08 04:02:02 +0000 | [diff] [blame] | 1071 | |
Rémi Denis-Courmont | acaf7df | 2011-03-08 22:44:11 +0000 | [diff] [blame] | 1072 | case PNPIPE_HANDLE: |
| 1073 | val = pn->pipe_handle; |
| 1074 | if (val == PN_PIPE_INVALID_HANDLE) |
| 1075 | return -EINVAL; |
| 1076 | break; |
| 1077 | |
Dinesh Kumar Sharma | bdb6e69 | 2011-11-18 01:22:05 +0000 | [diff] [blame] | 1078 | case PNPIPE_INITSTATE: |
| 1079 | val = pn->init_enable; |
| 1080 | break; |
| 1081 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1082 | default: |
| 1083 | return -ENOPROTOOPT; |
| 1084 | } |
| 1085 | |
| 1086 | len = min_t(unsigned int, sizeof(int), len); |
| 1087 | if (put_user(len, optlen)) |
| 1088 | return -EFAULT; |
| 1089 | if (put_user(val, (int __user *) optval)) |
| 1090 | return -EFAULT; |
| 1091 | return 0; |
| 1092 | } |
| 1093 | |
| 1094 | static int pipe_skb_send(struct sock *sk, struct sk_buff *skb) |
| 1095 | { |
| 1096 | struct pep_sock *pn = pep_sk(sk); |
| 1097 | struct pnpipehdr *ph; |
Rémi Denis-Courmont | e1a5964 | 2010-09-29 22:33:50 +0000 | [diff] [blame] | 1098 | int err; |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1099 | |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 1100 | if (pn_flow_safe(pn->tx_fc) && |
| 1101 | !atomic_add_unless(&pn->tx_credits, -1, 0)) { |
| 1102 | kfree_skb(skb); |
| 1103 | return -ENOBUFS; |
| 1104 | } |
| 1105 | |
Rémi Denis-Courmont | fea93ec | 2010-01-04 02:02:48 +0000 | [diff] [blame] | 1106 | skb_push(skb, 3 + pn->aligned); |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1107 | skb_reset_transport_header(skb); |
| 1108 | ph = pnp_hdr(skb); |
| 1109 | ph->utid = 0; |
Rémi Denis-Courmont | fea93ec | 2010-01-04 02:02:48 +0000 | [diff] [blame] | 1110 | if (pn->aligned) { |
| 1111 | ph->message_id = PNS_PIPE_ALIGNED_DATA; |
| 1112 | ph->data[0] = 0; /* padding */ |
| 1113 | } else |
| 1114 | ph->message_id = PNS_PIPE_DATA; |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1115 | ph->pipe_handle = pn->pipe_handle; |
Rémi Denis-Courmont | 14ba8fa | 2011-02-24 23:14:58 +0000 | [diff] [blame] | 1116 | err = pn_skb_send(sk, skb, NULL); |
Rémi Denis-Courmont | e1a5964 | 2010-09-29 22:33:50 +0000 | [diff] [blame] | 1117 | |
| 1118 | if (err && pn_flow_safe(pn->tx_fc)) |
| 1119 | atomic_inc(&pn->tx_credits); |
| 1120 | return err; |
| 1121 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1122 | } |
| 1123 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1124 | static int pep_sendmsg(struct kiocb *iocb, struct sock *sk, |
| 1125 | struct msghdr *msg, size_t len) |
| 1126 | { |
| 1127 | struct pep_sock *pn = pep_sk(sk); |
Rémi Denis-Courmont | b170437 | 2009-11-09 04:06:40 +0000 | [diff] [blame] | 1128 | struct sk_buff *skb; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1129 | long timeo; |
| 1130 | int flags = msg->msg_flags; |
| 1131 | int err, done; |
| 1132 | |
Sasha Levin | bcf1b70 | 2012-04-05 12:07:45 +0000 | [diff] [blame] | 1133 | if (len > USHRT_MAX) |
| 1134 | return -EMSGSIZE; |
| 1135 | |
Rémi Denis-Courmont | 82ecbcb | 2010-01-04 02:02:49 +0000 | [diff] [blame] | 1136 | if ((msg->msg_flags & ~(MSG_DONTWAIT|MSG_EOR|MSG_NOSIGNAL| |
| 1137 | MSG_CMSG_COMPAT)) || |
| 1138 | !(msg->msg_flags & MSG_EOR)) |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1139 | return -EOPNOTSUPP; |
| 1140 | |
Rémi Denis-Courmont | b170437 | 2009-11-09 04:06:40 +0000 | [diff] [blame] | 1141 | skb = sock_alloc_send_skb(sk, MAX_PNPIPE_HEADER + len, |
| 1142 | flags & MSG_DONTWAIT, &err); |
| 1143 | if (!skb) |
Rémi Denis-Courmont | 02ac326 | 2010-08-30 12:57:04 +0000 | [diff] [blame] | 1144 | return err; |
Rémi Denis-Courmont | b170437 | 2009-11-09 04:06:40 +0000 | [diff] [blame] | 1145 | |
Rémi Denis-Courmont | 638be34 | 2011-03-15 14:55:49 -0700 | [diff] [blame] | 1146 | skb_reserve(skb, MAX_PHONET_HEADER + 3 + pn->aligned); |
Rémi Denis-Courmont | b170437 | 2009-11-09 04:06:40 +0000 | [diff] [blame] | 1147 | err = memcpy_fromiovec(skb_put(skb, len), msg->msg_iov, len); |
| 1148 | if (err < 0) |
| 1149 | goto outfree; |
| 1150 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1151 | lock_sock(sk); |
| 1152 | timeo = sock_sndtimeo(sk, flags & MSG_DONTWAIT); |
| 1153 | if ((1 << sk->sk_state) & (TCPF_LISTEN|TCPF_CLOSE)) { |
| 1154 | err = -ENOTCONN; |
| 1155 | goto out; |
| 1156 | } |
| 1157 | if (sk->sk_state != TCP_ESTABLISHED) { |
| 1158 | /* Wait until the pipe gets to enabled state */ |
| 1159 | disabled: |
| 1160 | err = sk_stream_wait_connect(sk, &timeo); |
| 1161 | if (err) |
| 1162 | goto out; |
| 1163 | |
| 1164 | if (sk->sk_state == TCP_CLOSE_WAIT) { |
| 1165 | err = -ECONNRESET; |
| 1166 | goto out; |
| 1167 | } |
| 1168 | } |
| 1169 | BUG_ON(sk->sk_state != TCP_ESTABLISHED); |
| 1170 | |
| 1171 | /* Wait until flow control allows TX */ |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 1172 | done = atomic_read(&pn->tx_credits); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1173 | while (!done) { |
| 1174 | DEFINE_WAIT(wait); |
| 1175 | |
| 1176 | if (!timeo) { |
| 1177 | err = -EAGAIN; |
| 1178 | goto out; |
| 1179 | } |
| 1180 | if (signal_pending(current)) { |
| 1181 | err = sock_intr_errno(timeo); |
| 1182 | goto out; |
| 1183 | } |
| 1184 | |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1185 | prepare_to_wait(sk_sleep(sk), &wait, |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1186 | TASK_INTERRUPTIBLE); |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 1187 | done = sk_wait_event(sk, &timeo, atomic_read(&pn->tx_credits)); |
Eric Dumazet | 4381548 | 2010-04-29 11:01:49 +0000 | [diff] [blame] | 1188 | finish_wait(sk_sleep(sk), &wait); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1189 | |
| 1190 | if (sk->sk_state != TCP_ESTABLISHED) |
| 1191 | goto disabled; |
| 1192 | } |
| 1193 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1194 | err = pipe_skb_send(sk, skb); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1195 | if (err >= 0) |
| 1196 | err = len; /* success! */ |
| 1197 | skb = NULL; |
| 1198 | out: |
| 1199 | release_sock(sk); |
Rémi Denis-Courmont | b170437 | 2009-11-09 04:06:40 +0000 | [diff] [blame] | 1200 | outfree: |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1201 | kfree_skb(skb); |
| 1202 | return err; |
| 1203 | } |
| 1204 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1205 | int pep_writeable(struct sock *sk) |
| 1206 | { |
| 1207 | struct pep_sock *pn = pep_sk(sk); |
| 1208 | |
Rémi Denis-Courmont | be67773 | 2008-12-17 15:48:31 -0800 | [diff] [blame] | 1209 | return atomic_read(&pn->tx_credits); |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1210 | } |
| 1211 | |
| 1212 | int pep_write(struct sock *sk, struct sk_buff *skb) |
| 1213 | { |
| 1214 | struct sk_buff *rskb, *fs; |
| 1215 | int flen = 0; |
| 1216 | |
Rémi Denis-Courmont | fea93ec | 2010-01-04 02:02:48 +0000 | [diff] [blame] | 1217 | if (pep_sk(sk)->aligned) |
| 1218 | return pipe_skb_send(sk, skb); |
| 1219 | |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1220 | rskb = alloc_skb(MAX_PNPIPE_HEADER, GFP_ATOMIC); |
| 1221 | if (!rskb) { |
| 1222 | kfree_skb(skb); |
| 1223 | return -ENOMEM; |
| 1224 | } |
| 1225 | skb_shinfo(rskb)->frag_list = skb; |
| 1226 | rskb->len += skb->len; |
| 1227 | rskb->data_len += rskb->len; |
| 1228 | rskb->truesize += rskb->len; |
| 1229 | |
| 1230 | /* Avoid nested fragments */ |
David S. Miller | 5c313e9 | 2009-06-09 00:21:58 -0700 | [diff] [blame] | 1231 | skb_walk_frags(skb, fs) |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1232 | flen += fs->len; |
| 1233 | skb->next = skb_shinfo(skb)->frag_list; |
David S. Miller | 5c313e9 | 2009-06-09 00:21:58 -0700 | [diff] [blame] | 1234 | skb_frag_list_init(skb); |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1235 | skb->len -= flen; |
| 1236 | skb->data_len -= flen; |
| 1237 | skb->truesize -= flen; |
| 1238 | |
| 1239 | skb_reserve(rskb, MAX_PHONET_HEADER + 3); |
| 1240 | return pipe_skb_send(sk, rskb); |
| 1241 | } |
| 1242 | |
| 1243 | struct sk_buff *pep_read(struct sock *sk) |
| 1244 | { |
| 1245 | struct sk_buff *skb = skb_dequeue(&sk->sk_receive_queue); |
| 1246 | |
| 1247 | if (sk->sk_state == TCP_ESTABLISHED) |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 1248 | pipe_grant_credits(sk, GFP_ATOMIC); |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1249 | return skb; |
| 1250 | } |
| 1251 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1252 | static int pep_recvmsg(struct kiocb *iocb, struct sock *sk, |
| 1253 | struct msghdr *msg, size_t len, int noblock, |
| 1254 | int flags, int *addr_len) |
| 1255 | { |
| 1256 | struct sk_buff *skb; |
| 1257 | int err; |
| 1258 | |
Rémi Denis-Courmont | 82ecbcb | 2010-01-04 02:02:49 +0000 | [diff] [blame] | 1259 | if (flags & ~(MSG_OOB|MSG_PEEK|MSG_TRUNC|MSG_DONTWAIT|MSG_WAITALL| |
| 1260 | MSG_NOSIGNAL|MSG_CMSG_COMPAT)) |
| 1261 | return -EOPNOTSUPP; |
| 1262 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1263 | if (unlikely(1 << sk->sk_state & (TCPF_LISTEN | TCPF_CLOSE))) |
| 1264 | return -ENOTCONN; |
| 1265 | |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 1266 | if ((flags & MSG_OOB) || sock_flag(sk, SOCK_URGINLINE)) { |
| 1267 | /* Dequeue and acknowledge control request */ |
| 1268 | struct pep_sock *pn = pep_sk(sk); |
| 1269 | |
Rémi Denis-Courmont | 82ecbcb | 2010-01-04 02:02:49 +0000 | [diff] [blame] | 1270 | if (flags & MSG_PEEK) |
| 1271 | return -EOPNOTSUPP; |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 1272 | skb = skb_dequeue(&pn->ctrlreq_queue); |
| 1273 | if (skb) { |
| 1274 | pep_ctrlreq_error(sk, skb, PN_PIPE_NO_ERROR, |
| 1275 | GFP_KERNEL); |
| 1276 | msg->msg_flags |= MSG_OOB; |
| 1277 | goto copy; |
| 1278 | } |
| 1279 | if (flags & MSG_OOB) |
| 1280 | return -EINVAL; |
| 1281 | } |
| 1282 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1283 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 1284 | lock_sock(sk); |
| 1285 | if (skb == NULL) { |
| 1286 | if (err == -ENOTCONN && sk->sk_state == TCP_CLOSE_WAIT) |
| 1287 | err = -ECONNRESET; |
| 1288 | release_sock(sk); |
| 1289 | return err; |
| 1290 | } |
| 1291 | |
| 1292 | if (sk->sk_state == TCP_ESTABLISHED) |
Rémi Denis-Courmont | 44c9ab1 | 2011-03-08 22:44:09 +0000 | [diff] [blame] | 1293 | pipe_grant_credits(sk, GFP_KERNEL); |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1294 | release_sock(sk); |
Rémi Denis-Courmont | c41bd97f8 | 2008-10-05 11:15:43 -0700 | [diff] [blame] | 1295 | copy: |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1296 | msg->msg_flags |= MSG_EOR; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1297 | if (skb->len > len) |
| 1298 | msg->msg_flags |= MSG_TRUNC; |
| 1299 | else |
| 1300 | len = skb->len; |
| 1301 | |
| 1302 | err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, len); |
| 1303 | if (!err) |
| 1304 | err = (flags & MSG_TRUNC) ? skb->len : len; |
| 1305 | |
| 1306 | skb_free_datagram(sk, skb); |
| 1307 | return err; |
| 1308 | } |
| 1309 | |
| 1310 | static void pep_sock_unhash(struct sock *sk) |
| 1311 | { |
| 1312 | struct pep_sock *pn = pep_sk(sk); |
| 1313 | struct sock *skparent = NULL; |
| 1314 | |
| 1315 | lock_sock(sk); |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 1316 | |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 1317 | if (pn->listener != NULL) { |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1318 | skparent = pn->listener; |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 1319 | pn->listener = NULL; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1320 | release_sock(sk); |
| 1321 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1322 | pn = pep_sk(skparent); |
Rémi Denis-Courmont | 7dfde17 | 2010-05-26 00:44:44 +0000 | [diff] [blame] | 1323 | lock_sock(skparent); |
| 1324 | sk_del_node_init(sk); |
| 1325 | sk = skparent; |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1326 | } |
Rémi Denis-Courmont | 297edb6 | 2011-03-08 22:44:12 +0000 | [diff] [blame] | 1327 | |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1328 | /* Unhash a listening sock only when it is closed |
| 1329 | * and all of its active connected pipes are closed. */ |
| 1330 | if (hlist_empty(&pn->hlist)) |
| 1331 | pn_sock_unhash(&pn->pn_sk.sk); |
| 1332 | release_sock(sk); |
| 1333 | |
| 1334 | if (skparent) |
| 1335 | sock_put(skparent); |
| 1336 | } |
| 1337 | |
| 1338 | static struct proto pep_proto = { |
| 1339 | .close = pep_sock_close, |
| 1340 | .accept = pep_sock_accept, |
Kumar Sanghvi | b3d6255 | 2010-10-12 20:14:43 +0000 | [diff] [blame] | 1341 | .connect = pep_sock_connect, |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1342 | .ioctl = pep_ioctl, |
| 1343 | .init = pep_init, |
Rémi Denis-Courmont | 02a4761 | 2008-10-05 11:16:16 -0700 | [diff] [blame] | 1344 | .setsockopt = pep_setsockopt, |
| 1345 | .getsockopt = pep_getsockopt, |
Rémi Denis-Courmont | 9641458 | 2008-10-05 11:15:13 -0700 | [diff] [blame] | 1346 | .sendmsg = pep_sendmsg, |
| 1347 | .recvmsg = pep_recvmsg, |
| 1348 | .backlog_rcv = pep_do_rcv, |
| 1349 | .hash = pn_sock_hash, |
| 1350 | .unhash = pep_sock_unhash, |
| 1351 | .get_port = pn_sock_get_port, |
| 1352 | .obj_size = sizeof(struct pep_sock), |
| 1353 | .owner = THIS_MODULE, |
| 1354 | .name = "PNPIPE", |
| 1355 | }; |
| 1356 | |
| 1357 | static struct phonet_protocol pep_pn_proto = { |
| 1358 | .ops = &phonet_stream_ops, |
| 1359 | .prot = &pep_proto, |
| 1360 | .sock_type = SOCK_SEQPACKET, |
| 1361 | }; |
| 1362 | |
| 1363 | static int __init pep_register(void) |
| 1364 | { |
| 1365 | return phonet_proto_register(PN_PROTO_PIPE, &pep_pn_proto); |
| 1366 | } |
| 1367 | |
| 1368 | static void __exit pep_unregister(void) |
| 1369 | { |
| 1370 | phonet_proto_unregister(PN_PROTO_PIPE, &pep_pn_proto); |
| 1371 | } |
| 1372 | |
| 1373 | module_init(pep_register); |
| 1374 | module_exit(pep_unregister); |
| 1375 | MODULE_AUTHOR("Remi Denis-Courmont, Nokia"); |
| 1376 | MODULE_DESCRIPTION("Phonet pipe protocol"); |
| 1377 | MODULE_LICENSE("GPL"); |
| 1378 | MODULE_ALIAS_NET_PF_PROTO(PF_PHONET, PN_PROTO_PIPE); |