Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 1 | /* |
| 2 | * net/tipc/msg.c: TIPC message header routines |
YOSHIFUJI Hideaki | c430728 | 2007-02-09 23:25:21 +0900 | [diff] [blame] | 3 | * |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 4 | * Copyright (c) 2000-2006, 2014, Ericsson AB |
Allan Stephens | 741de3e | 2011-01-25 13:33:31 -0500 | [diff] [blame] | 5 | * Copyright (c) 2005, 2010-2011, Wind River Systems |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 6 | * All rights reserved. |
| 7 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 8 | * Redistribution and use in source and binary forms, with or without |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 9 | * modification, are permitted provided that the following conditions are met: |
| 10 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 11 | * 1. Redistributions of source code must retain the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer. |
| 13 | * 2. Redistributions in binary form must reproduce the above copyright |
| 14 | * notice, this list of conditions and the following disclaimer in the |
| 15 | * documentation and/or other materials provided with the distribution. |
| 16 | * 3. Neither the names of the copyright holders nor the names of its |
| 17 | * contributors may be used to endorse or promote products derived from |
| 18 | * this software without specific prior written permission. |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 19 | * |
Per Liden | 9ea1fd3 | 2006-01-11 13:30:43 +0100 | [diff] [blame] | 20 | * Alternatively, this software may be distributed under the terms of the |
| 21 | * GNU General Public License ("GPL") version 2 as published by the Free |
| 22 | * Software Foundation. |
| 23 | * |
| 24 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| 25 | * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE |
| 28 | * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| 31 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| 32 | * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 33 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 34 | * POSSIBILITY OF SUCH DAMAGE. |
| 35 | */ |
| 36 | |
| 37 | #include "core.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 38 | #include "msg.h" |
Jon Paul Maloy | 5a37907 | 2014-06-25 20:41:36 -0500 | [diff] [blame] | 39 | #include "addr.h" |
| 40 | #include "name_table.h" |
Per Liden | b97bf3f | 2006-01-02 19:04:38 +0100 | [diff] [blame] | 41 | |
Jon Paul Maloy | 8db1bae | 2014-06-25 20:41:35 -0500 | [diff] [blame] | 42 | #define MAX_FORWARD_SIZE 1024 |
| 43 | |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 44 | static unsigned int align(unsigned int i) |
Allan Stephens | 23461e8 | 2010-05-11 14:30:18 +0000 | [diff] [blame] | 45 | { |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 46 | return (i + 3) & ~3u; |
Allan Stephens | 23461e8 | 2010-05-11 14:30:18 +0000 | [diff] [blame] | 47 | } |
| 48 | |
Paul Gortmaker | ae8509c | 2013-06-17 10:54:47 -0400 | [diff] [blame] | 49 | void tipc_msg_init(struct tipc_msg *m, u32 user, u32 type, u32 hsize, |
| 50 | u32 destnode) |
Allan Stephens | 23461e8 | 2010-05-11 14:30:18 +0000 | [diff] [blame] | 51 | { |
| 52 | memset(m, 0, hsize); |
| 53 | msg_set_version(m); |
| 54 | msg_set_user(m, user); |
| 55 | msg_set_hdr_sz(m, hsize); |
| 56 | msg_set_size(m, hsize); |
| 57 | msg_set_prevnode(m, tipc_own_addr); |
| 58 | msg_set_type(m, type); |
Jon Paul Maloy | 1dd0bd2 | 2014-08-22 18:09:06 -0400 | [diff] [blame] | 59 | if (hsize > SHORT_H_SIZE) { |
| 60 | msg_set_orignode(m, tipc_own_addr); |
| 61 | msg_set_destnode(m, destnode); |
| 62 | } |
| 63 | } |
| 64 | |
| 65 | struct sk_buff *tipc_msg_create(uint user, uint type, uint hdr_sz, |
| 66 | uint data_sz, u32 dnode, u32 onode, |
| 67 | u32 dport, u32 oport, int errcode) |
| 68 | { |
| 69 | struct tipc_msg *msg; |
| 70 | struct sk_buff *buf; |
| 71 | |
| 72 | buf = tipc_buf_acquire(hdr_sz + data_sz); |
| 73 | if (unlikely(!buf)) |
| 74 | return NULL; |
| 75 | |
| 76 | msg = buf_msg(buf); |
| 77 | tipc_msg_init(msg, user, type, hdr_sz, dnode); |
| 78 | msg_set_size(msg, hdr_sz + data_sz); |
| 79 | msg_set_prevnode(msg, onode); |
| 80 | msg_set_origport(msg, oport); |
| 81 | msg_set_destport(msg, dport); |
| 82 | msg_set_errcode(msg, errcode); |
| 83 | if (hdr_sz > SHORT_H_SIZE) { |
| 84 | msg_set_orignode(msg, onode); |
| 85 | msg_set_destnode(msg, dnode); |
| 86 | } |
| 87 | return buf; |
Allan Stephens | 23461e8 | 2010-05-11 14:30:18 +0000 | [diff] [blame] | 88 | } |
| 89 | |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 90 | /* tipc_buf_append(): Append a buffer to the fragment list of another buffer |
Jon Paul Maloy | 29322d0d | 2014-07-05 13:44:13 -0400 | [diff] [blame] | 91 | * @*headbuf: in: NULL for first frag, otherwise value returned from prev call |
| 92 | * out: set when successful non-complete reassembly, otherwise NULL |
| 93 | * @*buf: in: the buffer to append. Always defined |
stephen hemminger | b2ad5e5 | 2014-10-29 22:58:51 -0700 | [diff] [blame] | 94 | * out: head buf after successful complete reassembly, otherwise NULL |
Jon Paul Maloy | 29322d0d | 2014-07-05 13:44:13 -0400 | [diff] [blame] | 95 | * Returns 1 when reassembly complete, otherwise 0 |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 96 | */ |
| 97 | int tipc_buf_append(struct sk_buff **headbuf, struct sk_buff **buf) |
| 98 | { |
| 99 | struct sk_buff *head = *headbuf; |
| 100 | struct sk_buff *frag = *buf; |
| 101 | struct sk_buff *tail; |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 102 | struct tipc_msg *msg; |
| 103 | u32 fragid; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 104 | int delta; |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 105 | bool headstolen; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 106 | |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 107 | if (!frag) |
| 108 | goto err; |
| 109 | |
| 110 | msg = buf_msg(frag); |
| 111 | fragid = msg_type(msg); |
| 112 | frag->next = NULL; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 113 | skb_pull(frag, msg_hdr_sz(msg)); |
| 114 | |
| 115 | if (fragid == FIRST_FRAGMENT) { |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 116 | if (unlikely(head)) |
| 117 | goto err; |
| 118 | if (unlikely(skb_unclone(frag, GFP_ATOMIC))) |
| 119 | goto err; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 120 | head = *headbuf = frag; |
| 121 | skb_frag_list_init(head); |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 122 | TIPC_SKB_CB(head)->tail = NULL; |
Jon Paul Maloy | 29322d0d | 2014-07-05 13:44:13 -0400 | [diff] [blame] | 123 | *buf = NULL; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 124 | return 0; |
| 125 | } |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 126 | |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 127 | if (!head) |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 128 | goto err; |
| 129 | |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 130 | if (skb_try_coalesce(head, frag, &headstolen, &delta)) { |
| 131 | kfree_skb_partial(frag, headstolen); |
| 132 | } else { |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 133 | tail = TIPC_SKB_CB(head)->tail; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 134 | if (!skb_has_frag_list(head)) |
| 135 | skb_shinfo(head)->frag_list = frag; |
| 136 | else |
| 137 | tail->next = frag; |
| 138 | head->truesize += frag->truesize; |
| 139 | head->data_len += frag->len; |
| 140 | head->len += frag->len; |
| 141 | TIPC_SKB_CB(head)->tail = frag; |
| 142 | } |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 143 | |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 144 | if (fragid == LAST_FRAGMENT) { |
| 145 | *buf = head; |
| 146 | TIPC_SKB_CB(head)->tail = NULL; |
| 147 | *headbuf = NULL; |
| 148 | return 1; |
| 149 | } |
| 150 | *buf = NULL; |
| 151 | return 0; |
Jon Paul Maloy | 13e9b99 | 2014-07-25 14:48:09 -0400 | [diff] [blame] | 152 | |
| 153 | err: |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 154 | pr_warn_ratelimited("Unable to build fragment list\n"); |
| 155 | kfree_skb(*buf); |
Jon Paul Maloy | 29322d0d | 2014-07-05 13:44:13 -0400 | [diff] [blame] | 156 | kfree_skb(*headbuf); |
| 157 | *buf = *headbuf = NULL; |
Jon Paul Maloy | 37e2216 | 2014-05-14 05:39:12 -0400 | [diff] [blame] | 158 | return 0; |
| 159 | } |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 160 | |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 161 | |
| 162 | /** |
Jon Paul Maloy | 9fbfb8b | 2014-07-16 20:41:03 -0400 | [diff] [blame] | 163 | * tipc_msg_build - create buffer chain containing specified header and data |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 164 | * @mhdr: Message header, to be prepended to data |
Al Viro | 45dcc68 | 2014-11-15 01:16:27 -0500 | [diff] [blame] | 165 | * @m: User message |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 166 | * @offset: Posision in iov to start copying from |
| 167 | * @dsz: Total length of user data |
| 168 | * @pktmax: Max packet size that can be used |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 169 | * @list: Buffer or chain of buffers to be returned to caller |
| 170 | * |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 171 | * Returns message data size or errno: -ENOMEM, -EFAULT |
| 172 | */ |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 173 | int tipc_msg_build(struct tipc_msg *mhdr, struct msghdr *m, int offset, |
| 174 | int dsz, int pktmax, struct sk_buff_head *list) |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 175 | { |
| 176 | int mhsz = msg_hdr_sz(mhdr); |
| 177 | int msz = mhsz + dsz; |
| 178 | int pktno = 1; |
| 179 | int pktsz; |
| 180 | int pktrem = pktmax; |
| 181 | int drem = dsz; |
| 182 | struct tipc_msg pkthdr; |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 183 | struct sk_buff *skb; |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 184 | char *pktpos; |
| 185 | int rc; |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 186 | |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 187 | msg_set_size(mhdr, msz); |
| 188 | |
| 189 | /* No fragmentation needed? */ |
| 190 | if (likely(msz <= pktmax)) { |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 191 | skb = tipc_buf_acquire(msz); |
| 192 | if (unlikely(!skb)) |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 193 | return -ENOMEM; |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 194 | __skb_queue_tail(list, skb); |
| 195 | skb_copy_to_linear_data(skb, mhdr, mhsz); |
| 196 | pktpos = skb->data + mhsz; |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 197 | if (!dsz || !memcpy_fromiovecend(pktpos, m->msg_iter.iov, offset, |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 198 | dsz)) |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 199 | return dsz; |
| 200 | rc = -EFAULT; |
| 201 | goto error; |
| 202 | } |
| 203 | |
| 204 | /* Prepare reusable fragment header */ |
| 205 | tipc_msg_init(&pkthdr, MSG_FRAGMENTER, FIRST_FRAGMENT, |
| 206 | INT_H_SIZE, msg_destnode(mhdr)); |
| 207 | msg_set_size(&pkthdr, pktmax); |
| 208 | msg_set_fragm_no(&pkthdr, pktno); |
| 209 | |
| 210 | /* Prepare first fragment */ |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 211 | skb = tipc_buf_acquire(pktmax); |
| 212 | if (!skb) |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 213 | return -ENOMEM; |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 214 | __skb_queue_tail(list, skb); |
| 215 | pktpos = skb->data; |
| 216 | skb_copy_to_linear_data(skb, &pkthdr, INT_H_SIZE); |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 217 | pktpos += INT_H_SIZE; |
| 218 | pktrem -= INT_H_SIZE; |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 219 | skb_copy_to_linear_data_offset(skb, INT_H_SIZE, mhdr, mhsz); |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 220 | pktpos += mhsz; |
| 221 | pktrem -= mhsz; |
| 222 | |
| 223 | do { |
| 224 | if (drem < pktrem) |
| 225 | pktrem = drem; |
| 226 | |
Al Viro | c0371da | 2014-11-24 10:42:55 -0500 | [diff] [blame] | 227 | if (memcpy_fromiovecend(pktpos, m->msg_iter.iov, offset, pktrem)) { |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 228 | rc = -EFAULT; |
| 229 | goto error; |
| 230 | } |
| 231 | drem -= pktrem; |
| 232 | offset += pktrem; |
| 233 | |
| 234 | if (!drem) |
| 235 | break; |
| 236 | |
| 237 | /* Prepare new fragment: */ |
| 238 | if (drem < (pktmax - INT_H_SIZE)) |
| 239 | pktsz = drem + INT_H_SIZE; |
| 240 | else |
| 241 | pktsz = pktmax; |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 242 | skb = tipc_buf_acquire(pktsz); |
| 243 | if (!skb) { |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 244 | rc = -ENOMEM; |
| 245 | goto error; |
| 246 | } |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 247 | __skb_queue_tail(list, skb); |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 248 | msg_set_type(&pkthdr, FRAGMENT); |
| 249 | msg_set_size(&pkthdr, pktsz); |
| 250 | msg_set_fragm_no(&pkthdr, ++pktno); |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 251 | skb_copy_to_linear_data(skb, &pkthdr, INT_H_SIZE); |
| 252 | pktpos = skb->data + INT_H_SIZE; |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 253 | pktrem = pktsz - INT_H_SIZE; |
| 254 | |
| 255 | } while (1); |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 256 | msg_set_type(buf_msg(skb), LAST_FRAGMENT); |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 257 | return dsz; |
| 258 | error: |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 259 | __skb_queue_purge(list); |
| 260 | __skb_queue_head_init(list); |
Jon Paul Maloy | 067608e | 2014-06-25 20:41:34 -0500 | [diff] [blame] | 261 | return rc; |
| 262 | } |
| 263 | |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 264 | /** |
| 265 | * tipc_msg_bundle(): Append contents of a buffer to tail of an existing one |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 266 | * @list: the buffer chain of the existing buffer ("bundle") |
| 267 | * @skb: buffer to be appended |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 268 | * @mtu: max allowable size for the bundle buffer |
| 269 | * Consumes buffer if successful |
| 270 | * Returns true if bundling could be performed, otherwise false |
| 271 | */ |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 272 | bool tipc_msg_bundle(struct sk_buff_head *list, struct sk_buff *skb, u32 mtu) |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 273 | { |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 274 | struct sk_buff *bskb = skb_peek_tail(list); |
| 275 | struct tipc_msg *bmsg = buf_msg(bskb); |
| 276 | struct tipc_msg *msg = buf_msg(skb); |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 277 | unsigned int bsz = msg_size(bmsg); |
| 278 | unsigned int msz = msg_size(msg); |
| 279 | u32 start = align(bsz); |
| 280 | u32 max = mtu - INT_H_SIZE; |
| 281 | u32 pad = start - bsz; |
| 282 | |
| 283 | if (likely(msg_user(msg) == MSG_FRAGMENTER)) |
| 284 | return false; |
| 285 | if (unlikely(msg_user(msg) == CHANGEOVER_PROTOCOL)) |
| 286 | return false; |
| 287 | if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) |
| 288 | return false; |
| 289 | if (likely(msg_user(bmsg) != MSG_BUNDLER)) |
| 290 | return false; |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 291 | if (likely(!TIPC_SKB_CB(bskb)->bundling)) |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 292 | return false; |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 293 | if (unlikely(skb_tailroom(bskb) < (pad + msz))) |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 294 | return false; |
| 295 | if (unlikely(max < (start + msz))) |
| 296 | return false; |
| 297 | |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 298 | skb_put(bskb, pad + msz); |
| 299 | skb_copy_to_linear_data_offset(bskb, start, skb->data, msz); |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 300 | msg_set_size(bmsg, start + msz); |
| 301 | msg_set_msgcnt(bmsg, msg_msgcnt(bmsg) + 1); |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 302 | kfree_skb(skb); |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 303 | return true; |
| 304 | } |
| 305 | |
| 306 | /** |
| 307 | * tipc_msg_make_bundle(): Create bundle buf and append message to its tail |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 308 | * @list: the buffer chain |
| 309 | * @skb: buffer to be appended and replaced |
| 310 | * @mtu: max allowable size for the bundle buffer, inclusive header |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 311 | * @dnode: destination node for message. (Not always present in header) |
| 312 | * Replaces buffer if successful |
stephen hemminger | b2ad5e5 | 2014-10-29 22:58:51 -0700 | [diff] [blame] | 313 | * Returns true if success, otherwise false |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 314 | */ |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 315 | bool tipc_msg_make_bundle(struct sk_buff_head *list, struct sk_buff *skb, |
| 316 | u32 mtu, u32 dnode) |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 317 | { |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 318 | struct sk_buff *bskb; |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 319 | struct tipc_msg *bmsg; |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 320 | struct tipc_msg *msg = buf_msg(skb); |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 321 | u32 msz = msg_size(msg); |
| 322 | u32 max = mtu - INT_H_SIZE; |
| 323 | |
| 324 | if (msg_user(msg) == MSG_FRAGMENTER) |
| 325 | return false; |
| 326 | if (msg_user(msg) == CHANGEOVER_PROTOCOL) |
| 327 | return false; |
| 328 | if (msg_user(msg) == BCAST_PROTOCOL) |
| 329 | return false; |
| 330 | if (msz > (max / 2)) |
| 331 | return false; |
| 332 | |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 333 | bskb = tipc_buf_acquire(max); |
| 334 | if (!bskb) |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 335 | return false; |
| 336 | |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 337 | skb_trim(bskb, INT_H_SIZE); |
| 338 | bmsg = buf_msg(bskb); |
Ying Xue | 58311d1 | 2014-11-26 11:41:49 +0800 | [diff] [blame] | 339 | tipc_msg_init(bmsg, MSG_BUNDLER, 0, INT_H_SIZE, dnode); |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 340 | msg_set_seqno(bmsg, msg_seqno(msg)); |
| 341 | msg_set_ack(bmsg, msg_ack(msg)); |
| 342 | msg_set_bcast_ack(bmsg, msg_bcast_ack(msg)); |
Ying Xue | 58dc55f | 2014-11-26 11:41:52 +0800 | [diff] [blame] | 343 | TIPC_SKB_CB(bskb)->bundling = true; |
| 344 | __skb_queue_tail(list, bskb); |
| 345 | return tipc_msg_bundle(list, skb, mtu); |
Jon Paul Maloy | 4f1688b | 2014-06-25 20:41:32 -0500 | [diff] [blame] | 346 | } |
Jon Paul Maloy | 8db1bae | 2014-06-25 20:41:35 -0500 | [diff] [blame] | 347 | |
| 348 | /** |
| 349 | * tipc_msg_reverse(): swap source and destination addresses and add error code |
| 350 | * @buf: buffer containing message to be reversed |
| 351 | * @dnode: return value: node where to send message after reversal |
| 352 | * @err: error code to be set in message |
| 353 | * Consumes buffer if failure |
| 354 | * Returns true if success, otherwise false |
| 355 | */ |
| 356 | bool tipc_msg_reverse(struct sk_buff *buf, u32 *dnode, int err) |
| 357 | { |
| 358 | struct tipc_msg *msg = buf_msg(buf); |
| 359 | uint imp = msg_importance(msg); |
| 360 | struct tipc_msg ohdr; |
| 361 | uint rdsz = min_t(uint, msg_data_sz(msg), MAX_FORWARD_SIZE); |
| 362 | |
Jon Paul Maloy | ac0074e | 2014-06-25 20:41:41 -0500 | [diff] [blame] | 363 | if (skb_linearize(buf)) |
Jon Paul Maloy | 8db1bae | 2014-06-25 20:41:35 -0500 | [diff] [blame] | 364 | goto exit; |
Jon Paul Maloy | ac0074e | 2014-06-25 20:41:41 -0500 | [diff] [blame] | 365 | if (msg_dest_droppable(msg)) |
| 366 | goto exit; |
| 367 | if (msg_errcode(msg)) |
Jon Paul Maloy | 8db1bae | 2014-06-25 20:41:35 -0500 | [diff] [blame] | 368 | goto exit; |
| 369 | |
| 370 | memcpy(&ohdr, msg, msg_hdr_sz(msg)); |
Jon Paul Maloy | ac0074e | 2014-06-25 20:41:41 -0500 | [diff] [blame] | 371 | imp = min_t(uint, imp + 1, TIPC_CRITICAL_IMPORTANCE); |
| 372 | if (msg_isdata(msg)) |
| 373 | msg_set_importance(msg, imp); |
Jon Paul Maloy | 8db1bae | 2014-06-25 20:41:35 -0500 | [diff] [blame] | 374 | msg_set_errcode(msg, err); |
| 375 | msg_set_origport(msg, msg_destport(&ohdr)); |
| 376 | msg_set_destport(msg, msg_origport(&ohdr)); |
| 377 | msg_set_prevnode(msg, tipc_own_addr); |
| 378 | if (!msg_short(msg)) { |
| 379 | msg_set_orignode(msg, msg_destnode(&ohdr)); |
| 380 | msg_set_destnode(msg, msg_orignode(&ohdr)); |
| 381 | } |
| 382 | msg_set_size(msg, msg_hdr_sz(msg) + rdsz); |
| 383 | skb_trim(buf, msg_size(msg)); |
| 384 | skb_orphan(buf); |
| 385 | *dnode = msg_orignode(&ohdr); |
| 386 | return true; |
| 387 | exit: |
| 388 | kfree_skb(buf); |
| 389 | return false; |
| 390 | } |
Jon Paul Maloy | 5a37907 | 2014-06-25 20:41:36 -0500 | [diff] [blame] | 391 | |
| 392 | /** |
| 393 | * tipc_msg_eval: determine fate of message that found no destination |
| 394 | * @buf: the buffer containing the message. |
| 395 | * @dnode: return value: next-hop node, if message to be forwarded |
| 396 | * @err: error code to use, if message to be rejected |
| 397 | * |
| 398 | * Does not consume buffer |
| 399 | * Returns 0 (TIPC_OK) if message ok and we can try again, -TIPC error |
| 400 | * code if message to be rejected |
| 401 | */ |
| 402 | int tipc_msg_eval(struct sk_buff *buf, u32 *dnode) |
| 403 | { |
| 404 | struct tipc_msg *msg = buf_msg(buf); |
| 405 | u32 dport; |
| 406 | |
| 407 | if (msg_type(msg) != TIPC_NAMED_MSG) |
| 408 | return -TIPC_ERR_NO_PORT; |
| 409 | if (skb_linearize(buf)) |
| 410 | return -TIPC_ERR_NO_NAME; |
| 411 | if (msg_data_sz(msg) > MAX_FORWARD_SIZE) |
| 412 | return -TIPC_ERR_NO_NAME; |
| 413 | if (msg_reroute_cnt(msg) > 0) |
| 414 | return -TIPC_ERR_NO_NAME; |
| 415 | |
| 416 | *dnode = addr_domain(msg_lookup_scope(msg)); |
| 417 | dport = tipc_nametbl_translate(msg_nametype(msg), |
| 418 | msg_nameinst(msg), |
| 419 | dnode); |
| 420 | if (!dport) |
| 421 | return -TIPC_ERR_NO_NAME; |
| 422 | msg_incr_reroute_cnt(msg); |
| 423 | msg_set_destnode(msg, *dnode); |
| 424 | msg_set_destport(msg, dport); |
| 425 | return TIPC_OK; |
| 426 | } |
Jon Paul Maloy | 078bec8 | 2014-07-16 20:41:00 -0400 | [diff] [blame] | 427 | |
| 428 | /* tipc_msg_reassemble() - clone a buffer chain of fragments and |
| 429 | * reassemble the clones into one message |
| 430 | */ |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 431 | struct sk_buff *tipc_msg_reassemble(struct sk_buff_head *list) |
Jon Paul Maloy | 078bec8 | 2014-07-16 20:41:00 -0400 | [diff] [blame] | 432 | { |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 433 | struct sk_buff *skb; |
| 434 | struct sk_buff *frag = NULL; |
Jon Paul Maloy | 078bec8 | 2014-07-16 20:41:00 -0400 | [diff] [blame] | 435 | struct sk_buff *head = NULL; |
| 436 | int hdr_sz; |
| 437 | |
| 438 | /* Copy header if single buffer */ |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 439 | if (skb_queue_len(list) == 1) { |
| 440 | skb = skb_peek(list); |
| 441 | hdr_sz = skb_headroom(skb) + msg_hdr_sz(buf_msg(skb)); |
| 442 | return __pskb_copy(skb, hdr_sz, GFP_ATOMIC); |
Jon Paul Maloy | 078bec8 | 2014-07-16 20:41:00 -0400 | [diff] [blame] | 443 | } |
| 444 | |
| 445 | /* Clone all fragments and reassemble */ |
Ying Xue | a6ca109 | 2014-11-26 11:41:55 +0800 | [diff] [blame] | 446 | skb_queue_walk(list, skb) { |
| 447 | frag = skb_clone(skb, GFP_ATOMIC); |
Jon Paul Maloy | 078bec8 | 2014-07-16 20:41:00 -0400 | [diff] [blame] | 448 | if (!frag) |
| 449 | goto error; |
| 450 | frag->next = NULL; |
| 451 | if (tipc_buf_append(&head, &frag)) |
| 452 | break; |
| 453 | if (!head) |
| 454 | goto error; |
Jon Paul Maloy | 078bec8 | 2014-07-16 20:41:00 -0400 | [diff] [blame] | 455 | } |
| 456 | return frag; |
| 457 | error: |
| 458 | pr_warn("Failed do clone local mcast rcv buffer\n"); |
| 459 | kfree_skb(head); |
| 460 | return NULL; |
| 461 | } |