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4dc315e2 AA |
1 | /* This program is free software; you can redistribute it and/or modify |
2 | * it under the terms of the GNU General Public License version 2 | |
3 | * as published by the Free Software Foundation. | |
4 | * | |
5 | * This program is distributed in the hope that it will be useful, | |
6 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8 | * GNU General Public License for more details. | |
9 | */ | |
10 | ||
11 | #include <net/6lowpan.h> | |
eab560e5 | 12 | #include <net/ndisc.h> |
4dc315e2 | 13 | #include <net/ieee802154_netdev.h> |
87a93e4e | 14 | #include <net/mac802154.h> |
4dc315e2 AA |
15 | |
16 | #include "6lowpan_i.h" | |
17 | ||
6350047e AA |
18 | #define LOWPAN_FRAG1_HEAD_SIZE 0x4 |
19 | #define LOWPAN_FRAGN_HEAD_SIZE 0x5 | |
20 | ||
4dc315e2 | 21 | struct lowpan_addr_info { |
eab560e5 AA |
22 | struct ieee802154_addr daddr; |
23 | struct ieee802154_addr saddr; | |
4dc315e2 AA |
24 | }; |
25 | ||
26 | static inline struct | |
27 | lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb) | |
28 | { | |
29 | WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info)); | |
30 | return (struct lowpan_addr_info *)(skb->data - | |
31 | sizeof(struct lowpan_addr_info)); | |
32 | } | |
33 | ||
87a93e4e AA |
34 | /* This callback will be called from AF_PACKET and IPv6 stack, the AF_PACKET |
35 | * sockets gives an 8 byte array for addresses only! | |
36 | * | |
37 | * TODO I think AF_PACKET DGRAM (sending/receiving) RAW (sending) makes no | |
38 | * sense here. We should disable it, the right use-case would be AF_INET6 | |
39 | * RAW/DGRAM sockets. | |
40 | */ | |
f4606583 | 41 | int lowpan_header_create(struct sk_buff *skb, struct net_device *ldev, |
eab560e5 AA |
42 | unsigned short type, const void *daddr, |
43 | const void *saddr, unsigned int len) | |
4dc315e2 | 44 | { |
eab560e5 AA |
45 | struct wpan_dev *wpan_dev = lowpan_802154_dev(ldev)->wdev->ieee802154_ptr; |
46 | struct lowpan_addr_info *info = lowpan_skb_priv(skb); | |
47 | struct lowpan_802154_neigh *llneigh = NULL; | |
48 | const struct ipv6hdr *hdr = ipv6_hdr(skb); | |
49 | struct neighbour *n; | |
4dc315e2 AA |
50 | |
51 | /* TODO: | |
52 | * if this package isn't ipv6 one, where should it be routed? | |
53 | */ | |
54 | if (type != ETH_P_IPV6) | |
55 | return 0; | |
56 | ||
eab560e5 AA |
57 | /* intra-pan communication */ |
58 | info->saddr.pan_id = wpan_dev->pan_id; | |
59 | info->daddr.pan_id = info->saddr.pan_id; | |
4dc315e2 | 60 | |
eab560e5 AA |
61 | if (!memcmp(daddr, ldev->broadcast, EUI64_ADDR_LEN)) { |
62 | info->daddr.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); | |
63 | info->daddr.mode = IEEE802154_ADDR_SHORT; | |
64 | } else { | |
65 | __le16 short_addr = cpu_to_le16(IEEE802154_ADDR_SHORT_UNSPEC); | |
66 | ||
67 | n = neigh_lookup(&nd_tbl, &hdr->daddr, ldev); | |
68 | if (n) { | |
69 | llneigh = lowpan_802154_neigh(neighbour_priv(n)); | |
70 | read_lock_bh(&n->lock); | |
71 | short_addr = llneigh->short_addr; | |
72 | read_unlock_bh(&n->lock); | |
73 | } | |
4dc315e2 | 74 | |
eab560e5 AA |
75 | if (llneigh && |
76 | lowpan_802154_is_valid_src_short_addr(short_addr)) { | |
77 | info->daddr.short_addr = short_addr; | |
78 | info->daddr.mode = IEEE802154_ADDR_SHORT; | |
79 | } else { | |
80 | info->daddr.mode = IEEE802154_ADDR_LONG; | |
81 | ieee802154_be64_to_le64(&info->daddr.extended_addr, | |
82 | daddr); | |
83 | } | |
4dc315e2 | 84 | |
eab560e5 AA |
85 | if (n) |
86 | neigh_release(n); | |
87 | } | |
88 | ||
89 | if (!saddr) { | |
90 | if (lowpan_802154_is_valid_src_short_addr(wpan_dev->short_addr)) { | |
91 | info->saddr.mode = IEEE802154_ADDR_SHORT; | |
92 | info->saddr.short_addr = wpan_dev->short_addr; | |
93 | } else { | |
94 | info->saddr.mode = IEEE802154_ADDR_LONG; | |
95 | info->saddr.extended_addr = wpan_dev->extended_addr; | |
96 | } | |
97 | } else { | |
98 | info->saddr.mode = IEEE802154_ADDR_LONG; | |
99 | ieee802154_be64_to_le64(&info->saddr.extended_addr, saddr); | |
100 | } | |
4dc315e2 AA |
101 | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static struct sk_buff* | |
106 | lowpan_alloc_frag(struct sk_buff *skb, int size, | |
4bc8fbc9 | 107 | const struct ieee802154_hdr *master_hdr, bool frag1) |
4dc315e2 | 108 | { |
2e4d60cb | 109 | struct net_device *wdev = lowpan_802154_dev(skb->dev)->wdev; |
4dc315e2 AA |
110 | struct sk_buff *frag; |
111 | int rc; | |
112 | ||
87a93e4e | 113 | frag = alloc_skb(wdev->needed_headroom + wdev->needed_tailroom + size, |
4dc315e2 AA |
114 | GFP_ATOMIC); |
115 | ||
116 | if (likely(frag)) { | |
f4606583 | 117 | frag->dev = wdev; |
4dc315e2 | 118 | frag->priority = skb->priority; |
87a93e4e | 119 | skb_reserve(frag, wdev->needed_headroom); |
4dc315e2 AA |
120 | skb_reset_network_header(frag); |
121 | *mac_cb(frag) = *mac_cb(skb); | |
122 | ||
4bc8fbc9 | 123 | if (frag1) { |
59ae1d12 | 124 | skb_put_data(frag, skb_mac_header(skb), skb->mac_len); |
4bc8fbc9 AA |
125 | } else { |
126 | rc = wpan_dev_hard_header(frag, wdev, | |
127 | &master_hdr->dest, | |
128 | &master_hdr->source, size); | |
129 | if (rc < 0) { | |
130 | kfree_skb(frag); | |
131 | return ERR_PTR(rc); | |
132 | } | |
4dc315e2 AA |
133 | } |
134 | } else { | |
135 | frag = ERR_PTR(-ENOMEM); | |
136 | } | |
137 | ||
138 | return frag; | |
139 | } | |
140 | ||
141 | static int | |
142 | lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, | |
143 | u8 *frag_hdr, int frag_hdrlen, | |
4bc8fbc9 | 144 | int offset, int len, bool frag1) |
4dc315e2 AA |
145 | { |
146 | struct sk_buff *frag; | |
147 | ||
148 | raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); | |
149 | ||
4bc8fbc9 | 150 | frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr, frag1); |
4dc315e2 | 151 | if (IS_ERR(frag)) |
8f8db918 | 152 | return PTR_ERR(frag); |
4dc315e2 | 153 | |
59ae1d12 JB |
154 | skb_put_data(frag, frag_hdr, frag_hdrlen); |
155 | skb_put_data(frag, skb_network_header(skb) + offset, len); | |
4dc315e2 AA |
156 | |
157 | raw_dump_table(__func__, " fragment dump", frag->data, frag->len); | |
158 | ||
159 | return dev_queue_xmit(frag); | |
160 | } | |
161 | ||
162 | static int | |
f4606583 | 163 | lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev, |
5f509239 AA |
164 | const struct ieee802154_hdr *wpan_hdr, u16 dgram_size, |
165 | u16 dgram_offset) | |
4dc315e2 | 166 | { |
4dc315e2 AA |
167 | __be16 frag_tag; |
168 | u8 frag_hdr[5]; | |
169 | int frag_cap, frag_len, payload_cap, rc; | |
170 | int skb_unprocessed, skb_offset; | |
171 | ||
2e4d60cb AA |
172 | frag_tag = htons(lowpan_802154_dev(ldev)->fragment_tag); |
173 | lowpan_802154_dev(ldev)->fragment_tag++; | |
4dc315e2 AA |
174 | |
175 | frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); | |
176 | frag_hdr[1] = dgram_size & 0xff; | |
177 | memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); | |
178 | ||
179 | payload_cap = ieee802154_max_payload(wpan_hdr); | |
180 | ||
181 | frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - | |
182 | skb_network_header_len(skb), 8); | |
183 | ||
184 | skb_offset = skb_network_header_len(skb); | |
185 | skb_unprocessed = skb->len - skb->mac_len - skb_offset; | |
186 | ||
187 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, | |
188 | LOWPAN_FRAG1_HEAD_SIZE, 0, | |
4bc8fbc9 AA |
189 | frag_len + skb_network_header_len(skb), |
190 | true); | |
4dc315e2 AA |
191 | if (rc) { |
192 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
193 | __func__, ntohs(frag_tag)); | |
194 | goto err; | |
195 | } | |
196 | ||
197 | frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
198 | frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN; | |
199 | frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8); | |
200 | ||
201 | do { | |
202 | dgram_offset += frag_len; | |
203 | skb_offset += frag_len; | |
204 | skb_unprocessed -= frag_len; | |
205 | frag_len = min(frag_cap, skb_unprocessed); | |
206 | ||
207 | frag_hdr[4] = dgram_offset >> 3; | |
208 | ||
209 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, | |
210 | LOWPAN_FRAGN_HEAD_SIZE, skb_offset, | |
4bc8fbc9 | 211 | frag_len, false); |
4dc315e2 AA |
212 | if (rc) { |
213 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", | |
214 | __func__, ntohs(frag_tag), skb_offset); | |
215 | goto err; | |
216 | } | |
217 | } while (skb_unprocessed > frag_cap); | |
218 | ||
1c64f147 AA |
219 | ldev->stats.tx_packets++; |
220 | ldev->stats.tx_bytes += dgram_size; | |
4dc315e2 AA |
221 | consume_skb(skb); |
222 | return NET_XMIT_SUCCESS; | |
223 | ||
224 | err: | |
225 | kfree_skb(skb); | |
226 | return rc; | |
227 | } | |
228 | ||
187625e1 | 229 | static int lowpan_header(struct sk_buff *skb, struct net_device *ldev, |
5f509239 | 230 | u16 *dgram_size, u16 *dgram_offset) |
4dc315e2 | 231 | { |
2e4d60cb | 232 | struct wpan_dev *wpan_dev = lowpan_802154_dev(ldev)->wdev->ieee802154_ptr; |
4dc315e2 AA |
233 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); |
234 | struct lowpan_addr_info info; | |
4dc315e2 AA |
235 | |
236 | memcpy(&info, lowpan_skb_priv(skb), sizeof(info)); | |
237 | ||
187625e1 | 238 | *dgram_size = skb->len; |
eab560e5 | 239 | lowpan_header_compress(skb, ldev, &info.daddr, &info.saddr); |
187625e1 AA |
240 | /* dgram_offset = (saved bytes after compression) + lowpan header len */ |
241 | *dgram_offset = (*dgram_size - skb->len) + skb_network_header_len(skb); | |
4dc315e2 AA |
242 | |
243 | cb->type = IEEE802154_FC_TYPE_DATA; | |
244 | ||
eab560e5 AA |
245 | if (info.daddr.mode == IEEE802154_ADDR_SHORT && |
246 | ieee802154_is_broadcast_short_addr(info.daddr.short_addr)) | |
4dc315e2 | 247 | cb->ackreq = false; |
eab560e5 | 248 | else |
c91208d8 | 249 | cb->ackreq = wpan_dev->ackreq; |
4dc315e2 | 250 | |
eab560e5 AA |
251 | return wpan_dev_hard_header(skb, lowpan_802154_dev(ldev)->wdev, |
252 | &info.daddr, &info.saddr, 0); | |
4dc315e2 AA |
253 | } |
254 | ||
f4606583 | 255 | netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev) |
4dc315e2 AA |
256 | { |
257 | struct ieee802154_hdr wpan_hdr; | |
258 | int max_single, ret; | |
5f509239 | 259 | u16 dgram_size, dgram_offset; |
4dc315e2 AA |
260 | |
261 | pr_debug("package xmit\n"); | |
262 | ||
5f509239 AA |
263 | WARN_ON_ONCE(skb->len > IPV6_MIN_MTU); |
264 | ||
4dc315e2 AA |
265 | /* We must take a copy of the skb before we modify/replace the ipv6 |
266 | * header as the header could be used elsewhere | |
267 | */ | |
10f177b0 AA |
268 | if (unlikely(skb_headroom(skb) < ldev->needed_headroom || |
269 | skb_tailroom(skb) < ldev->needed_tailroom)) { | |
270 | struct sk_buff *nskb; | |
271 | ||
272 | nskb = skb_copy_expand(skb, ldev->needed_headroom, | |
273 | ldev->needed_tailroom, GFP_ATOMIC); | |
274 | if (likely(nskb)) { | |
275 | consume_skb(skb); | |
276 | skb = nskb; | |
277 | } else { | |
278 | kfree_skb(skb); | |
279 | return NET_XMIT_DROP; | |
280 | } | |
281 | } else { | |
282 | skb = skb_unshare(skb, GFP_ATOMIC); | |
283 | if (!skb) | |
284 | return NET_XMIT_DROP; | |
285 | } | |
4dc315e2 | 286 | |
187625e1 | 287 | ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset); |
4dc315e2 AA |
288 | if (ret < 0) { |
289 | kfree_skb(skb); | |
290 | return NET_XMIT_DROP; | |
291 | } | |
292 | ||
293 | if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) { | |
294 | kfree_skb(skb); | |
295 | return NET_XMIT_DROP; | |
296 | } | |
297 | ||
298 | max_single = ieee802154_max_payload(&wpan_hdr); | |
299 | ||
300 | if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) { | |
2e4d60cb | 301 | skb->dev = lowpan_802154_dev(ldev)->wdev; |
1c64f147 AA |
302 | ldev->stats.tx_packets++; |
303 | ldev->stats.tx_bytes += dgram_size; | |
4dc315e2 AA |
304 | return dev_queue_xmit(skb); |
305 | } else { | |
306 | netdev_tx_t rc; | |
307 | ||
308 | pr_debug("frame is too big, fragmentation is needed\n"); | |
187625e1 AA |
309 | rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr, dgram_size, |
310 | dgram_offset); | |
4dc315e2 AA |
311 | |
312 | return rc < 0 ? NET_XMIT_DROP : rc; | |
313 | } | |
314 | } |