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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> | |
12 | #include <net/ieee802154_netdev.h> | |
87a93e4e | 13 | #include <net/mac802154.h> |
4dc315e2 AA |
14 | |
15 | #include "6lowpan_i.h" | |
16 | ||
17 | /* don't save pan id, it's intra pan */ | |
18 | struct lowpan_addr { | |
19 | u8 mode; | |
20 | union { | |
21 | /* IPv6 needs big endian here */ | |
22 | __be64 extended_addr; | |
23 | __be16 short_addr; | |
24 | } u; | |
25 | }; | |
26 | ||
27 | struct lowpan_addr_info { | |
28 | struct lowpan_addr daddr; | |
29 | struct lowpan_addr saddr; | |
30 | }; | |
31 | ||
32 | static inline struct | |
33 | lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb) | |
34 | { | |
35 | WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info)); | |
36 | return (struct lowpan_addr_info *)(skb->data - | |
37 | sizeof(struct lowpan_addr_info)); | |
38 | } | |
39 | ||
87a93e4e AA |
40 | /* This callback will be called from AF_PACKET and IPv6 stack, the AF_PACKET |
41 | * sockets gives an 8 byte array for addresses only! | |
42 | * | |
43 | * TODO I think AF_PACKET DGRAM (sending/receiving) RAW (sending) makes no | |
44 | * sense here. We should disable it, the right use-case would be AF_INET6 | |
45 | * RAW/DGRAM sockets. | |
46 | */ | |
f4606583 | 47 | int lowpan_header_create(struct sk_buff *skb, struct net_device *ldev, |
4dc315e2 AA |
48 | unsigned short type, const void *_daddr, |
49 | const void *_saddr, unsigned int len) | |
50 | { | |
51 | const u8 *saddr = _saddr; | |
52 | const u8 *daddr = _daddr; | |
53 | struct lowpan_addr_info *info; | |
54 | ||
55 | /* TODO: | |
56 | * if this package isn't ipv6 one, where should it be routed? | |
57 | */ | |
58 | if (type != ETH_P_IPV6) | |
59 | return 0; | |
60 | ||
61 | if (!saddr) | |
f4606583 | 62 | saddr = ldev->dev_addr; |
4dc315e2 AA |
63 | |
64 | raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
65 | raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
66 | ||
67 | info = lowpan_skb_priv(skb); | |
68 | ||
69 | /* TODO: Currently we only support extended_addr */ | |
70 | info->daddr.mode = IEEE802154_ADDR_LONG; | |
71 | memcpy(&info->daddr.u.extended_addr, daddr, | |
72 | sizeof(info->daddr.u.extended_addr)); | |
73 | info->saddr.mode = IEEE802154_ADDR_LONG; | |
74 | memcpy(&info->saddr.u.extended_addr, saddr, | |
75 | sizeof(info->daddr.u.extended_addr)); | |
76 | ||
77 | return 0; | |
78 | } | |
79 | ||
80 | static struct sk_buff* | |
81 | lowpan_alloc_frag(struct sk_buff *skb, int size, | |
82 | const struct ieee802154_hdr *master_hdr) | |
83 | { | |
f4606583 | 84 | struct net_device *wdev = lowpan_dev_info(skb->dev)->wdev; |
4dc315e2 AA |
85 | struct sk_buff *frag; |
86 | int rc; | |
87 | ||
87a93e4e | 88 | frag = alloc_skb(wdev->needed_headroom + wdev->needed_tailroom + size, |
4dc315e2 AA |
89 | GFP_ATOMIC); |
90 | ||
91 | if (likely(frag)) { | |
f4606583 | 92 | frag->dev = wdev; |
4dc315e2 | 93 | frag->priority = skb->priority; |
87a93e4e | 94 | skb_reserve(frag, wdev->needed_headroom); |
4dc315e2 AA |
95 | skb_reset_network_header(frag); |
96 | *mac_cb(frag) = *mac_cb(skb); | |
97 | ||
838b83d6 AA |
98 | rc = wpan_dev_hard_header(frag, wdev, &master_hdr->dest, |
99 | &master_hdr->source, size); | |
4dc315e2 AA |
100 | if (rc < 0) { |
101 | kfree_skb(frag); | |
102 | return ERR_PTR(rc); | |
103 | } | |
104 | } else { | |
105 | frag = ERR_PTR(-ENOMEM); | |
106 | } | |
107 | ||
108 | return frag; | |
109 | } | |
110 | ||
111 | static int | |
112 | lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, | |
113 | u8 *frag_hdr, int frag_hdrlen, | |
114 | int offset, int len) | |
115 | { | |
116 | struct sk_buff *frag; | |
117 | ||
118 | raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); | |
119 | ||
120 | frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); | |
121 | if (IS_ERR(frag)) | |
8f8db918 | 122 | return PTR_ERR(frag); |
4dc315e2 AA |
123 | |
124 | memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen); | |
125 | memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len); | |
126 | ||
127 | raw_dump_table(__func__, " fragment dump", frag->data, frag->len); | |
128 | ||
129 | return dev_queue_xmit(frag); | |
130 | } | |
131 | ||
132 | static int | |
f4606583 | 133 | lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev, |
187625e1 AA |
134 | const struct ieee802154_hdr *wpan_hdr, u16 dgram_size, |
135 | u16 dgram_offset) | |
4dc315e2 | 136 | { |
4dc315e2 AA |
137 | __be16 frag_tag; |
138 | u8 frag_hdr[5]; | |
139 | int frag_cap, frag_len, payload_cap, rc; | |
140 | int skb_unprocessed, skb_offset; | |
141 | ||
f4606583 AA |
142 | frag_tag = htons(lowpan_dev_info(ldev)->fragment_tag); |
143 | lowpan_dev_info(ldev)->fragment_tag++; | |
4dc315e2 AA |
144 | |
145 | frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); | |
146 | frag_hdr[1] = dgram_size & 0xff; | |
147 | memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); | |
148 | ||
149 | payload_cap = ieee802154_max_payload(wpan_hdr); | |
150 | ||
151 | frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - | |
152 | skb_network_header_len(skb), 8); | |
153 | ||
154 | skb_offset = skb_network_header_len(skb); | |
155 | skb_unprocessed = skb->len - skb->mac_len - skb_offset; | |
156 | ||
157 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, | |
158 | LOWPAN_FRAG1_HEAD_SIZE, 0, | |
159 | frag_len + skb_network_header_len(skb)); | |
160 | if (rc) { | |
161 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
162 | __func__, ntohs(frag_tag)); | |
163 | goto err; | |
164 | } | |
165 | ||
166 | frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
167 | frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN; | |
168 | frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8); | |
169 | ||
170 | do { | |
171 | dgram_offset += frag_len; | |
172 | skb_offset += frag_len; | |
173 | skb_unprocessed -= frag_len; | |
174 | frag_len = min(frag_cap, skb_unprocessed); | |
175 | ||
176 | frag_hdr[4] = dgram_offset >> 3; | |
177 | ||
178 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, | |
179 | LOWPAN_FRAGN_HEAD_SIZE, skb_offset, | |
180 | frag_len); | |
181 | if (rc) { | |
182 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", | |
183 | __func__, ntohs(frag_tag), skb_offset); | |
184 | goto err; | |
185 | } | |
186 | } while (skb_unprocessed > frag_cap); | |
187 | ||
188 | consume_skb(skb); | |
189 | return NET_XMIT_SUCCESS; | |
190 | ||
191 | err: | |
192 | kfree_skb(skb); | |
193 | return rc; | |
194 | } | |
195 | ||
187625e1 AA |
196 | static int lowpan_header(struct sk_buff *skb, struct net_device *ldev, |
197 | u16 *dgram_size, u16 *dgram_offset) | |
4dc315e2 | 198 | { |
f4606583 | 199 | struct wpan_dev *wpan_dev = lowpan_dev_info(ldev)->wdev->ieee802154_ptr; |
4dc315e2 AA |
200 | struct ieee802154_addr sa, da; |
201 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); | |
202 | struct lowpan_addr_info info; | |
203 | void *daddr, *saddr; | |
204 | ||
205 | memcpy(&info, lowpan_skb_priv(skb), sizeof(info)); | |
206 | ||
207 | /* TODO: Currently we only support extended_addr */ | |
208 | daddr = &info.daddr.u.extended_addr; | |
209 | saddr = &info.saddr.u.extended_addr; | |
210 | ||
187625e1 | 211 | *dgram_size = skb->len; |
f4606583 | 212 | lowpan_header_compress(skb, ldev, ETH_P_IPV6, daddr, saddr, skb->len); |
187625e1 AA |
213 | /* dgram_offset = (saved bytes after compression) + lowpan header len */ |
214 | *dgram_offset = (*dgram_size - skb->len) + skb_network_header_len(skb); | |
4dc315e2 AA |
215 | |
216 | cb->type = IEEE802154_FC_TYPE_DATA; | |
217 | ||
218 | /* prepare wpan address data */ | |
219 | sa.mode = IEEE802154_ADDR_LONG; | |
1caf6f47 | 220 | sa.pan_id = wpan_dev->pan_id; |
4dc315e2 AA |
221 | sa.extended_addr = ieee802154_devaddr_from_raw(saddr); |
222 | ||
223 | /* intra-PAN communications */ | |
224 | da.pan_id = sa.pan_id; | |
225 | ||
226 | /* if the destination address is the broadcast address, use the | |
227 | * corresponding short address | |
228 | */ | |
229 | if (lowpan_is_addr_broadcast((const u8 *)daddr)) { | |
230 | da.mode = IEEE802154_ADDR_SHORT; | |
231 | da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); | |
232 | cb->ackreq = false; | |
233 | } else { | |
234 | da.mode = IEEE802154_ADDR_LONG; | |
235 | da.extended_addr = ieee802154_devaddr_from_raw(daddr); | |
c91208d8 | 236 | cb->ackreq = wpan_dev->ackreq; |
4dc315e2 AA |
237 | } |
238 | ||
838b83d6 AA |
239 | return wpan_dev_hard_header(skb, lowpan_dev_info(ldev)->wdev, &da, &sa, |
240 | 0); | |
4dc315e2 AA |
241 | } |
242 | ||
f4606583 | 243 | netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev) |
4dc315e2 AA |
244 | { |
245 | struct ieee802154_hdr wpan_hdr; | |
246 | int max_single, ret; | |
187625e1 | 247 | u16 dgram_size, dgram_offset; |
4dc315e2 AA |
248 | |
249 | pr_debug("package xmit\n"); | |
250 | ||
251 | /* We must take a copy of the skb before we modify/replace the ipv6 | |
252 | * header as the header could be used elsewhere | |
253 | */ | |
254 | skb = skb_unshare(skb, GFP_ATOMIC); | |
255 | if (!skb) | |
256 | return NET_XMIT_DROP; | |
257 | ||
187625e1 | 258 | ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset); |
4dc315e2 AA |
259 | if (ret < 0) { |
260 | kfree_skb(skb); | |
261 | return NET_XMIT_DROP; | |
262 | } | |
263 | ||
264 | if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) { | |
265 | kfree_skb(skb); | |
266 | return NET_XMIT_DROP; | |
267 | } | |
268 | ||
269 | max_single = ieee802154_max_payload(&wpan_hdr); | |
270 | ||
271 | if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) { | |
f4606583 | 272 | skb->dev = lowpan_dev_info(ldev)->wdev; |
4dc315e2 AA |
273 | return dev_queue_xmit(skb); |
274 | } else { | |
275 | netdev_tx_t rc; | |
276 | ||
277 | pr_debug("frame is too big, fragmentation is needed\n"); | |
187625e1 AA |
278 | rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr, dgram_size, |
279 | dgram_offset); | |
4dc315e2 AA |
280 | |
281 | return rc < 0 ? NET_XMIT_DROP : rc; | |
282 | } | |
283 | } |