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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> | |
13 | ||
14 | #include "6lowpan_i.h" | |
15 | ||
16 | /* don't save pan id, it's intra pan */ | |
17 | struct lowpan_addr { | |
18 | u8 mode; | |
19 | union { | |
20 | /* IPv6 needs big endian here */ | |
21 | __be64 extended_addr; | |
22 | __be16 short_addr; | |
23 | } u; | |
24 | }; | |
25 | ||
26 | struct lowpan_addr_info { | |
27 | struct lowpan_addr daddr; | |
28 | struct lowpan_addr saddr; | |
29 | }; | |
30 | ||
31 | static inline struct | |
32 | lowpan_addr_info *lowpan_skb_priv(const struct sk_buff *skb) | |
33 | { | |
34 | WARN_ON_ONCE(skb_headroom(skb) < sizeof(struct lowpan_addr_info)); | |
35 | return (struct lowpan_addr_info *)(skb->data - | |
36 | sizeof(struct lowpan_addr_info)); | |
37 | } | |
38 | ||
f4606583 | 39 | int lowpan_header_create(struct sk_buff *skb, struct net_device *ldev, |
4dc315e2 AA |
40 | unsigned short type, const void *_daddr, |
41 | const void *_saddr, unsigned int len) | |
42 | { | |
43 | const u8 *saddr = _saddr; | |
44 | const u8 *daddr = _daddr; | |
45 | struct lowpan_addr_info *info; | |
46 | ||
47 | /* TODO: | |
48 | * if this package isn't ipv6 one, where should it be routed? | |
49 | */ | |
50 | if (type != ETH_P_IPV6) | |
51 | return 0; | |
52 | ||
53 | if (!saddr) | |
f4606583 | 54 | saddr = ldev->dev_addr; |
4dc315e2 AA |
55 | |
56 | raw_dump_inline(__func__, "saddr", (unsigned char *)saddr, 8); | |
57 | raw_dump_inline(__func__, "daddr", (unsigned char *)daddr, 8); | |
58 | ||
59 | info = lowpan_skb_priv(skb); | |
60 | ||
61 | /* TODO: Currently we only support extended_addr */ | |
62 | info->daddr.mode = IEEE802154_ADDR_LONG; | |
63 | memcpy(&info->daddr.u.extended_addr, daddr, | |
64 | sizeof(info->daddr.u.extended_addr)); | |
65 | info->saddr.mode = IEEE802154_ADDR_LONG; | |
66 | memcpy(&info->saddr.u.extended_addr, saddr, | |
67 | sizeof(info->daddr.u.extended_addr)); | |
68 | ||
69 | return 0; | |
70 | } | |
71 | ||
72 | static struct sk_buff* | |
73 | lowpan_alloc_frag(struct sk_buff *skb, int size, | |
74 | const struct ieee802154_hdr *master_hdr) | |
75 | { | |
f4606583 | 76 | struct net_device *wdev = lowpan_dev_info(skb->dev)->wdev; |
4dc315e2 AA |
77 | struct sk_buff *frag; |
78 | int rc; | |
79 | ||
f4606583 | 80 | frag = alloc_skb(wdev->hard_header_len + wdev->needed_tailroom + size, |
4dc315e2 AA |
81 | GFP_ATOMIC); |
82 | ||
83 | if (likely(frag)) { | |
f4606583 | 84 | frag->dev = wdev; |
4dc315e2 | 85 | frag->priority = skb->priority; |
f4606583 | 86 | skb_reserve(frag, wdev->hard_header_len); |
4dc315e2 AA |
87 | skb_reset_network_header(frag); |
88 | *mac_cb(frag) = *mac_cb(skb); | |
89 | ||
f4606583 | 90 | rc = dev_hard_header(frag, wdev, 0, &master_hdr->dest, |
4dc315e2 AA |
91 | &master_hdr->source, size); |
92 | if (rc < 0) { | |
93 | kfree_skb(frag); | |
94 | return ERR_PTR(rc); | |
95 | } | |
96 | } else { | |
97 | frag = ERR_PTR(-ENOMEM); | |
98 | } | |
99 | ||
100 | return frag; | |
101 | } | |
102 | ||
103 | static int | |
104 | lowpan_xmit_fragment(struct sk_buff *skb, const struct ieee802154_hdr *wpan_hdr, | |
105 | u8 *frag_hdr, int frag_hdrlen, | |
106 | int offset, int len) | |
107 | { | |
108 | struct sk_buff *frag; | |
109 | ||
110 | raw_dump_inline(__func__, " fragment header", frag_hdr, frag_hdrlen); | |
111 | ||
112 | frag = lowpan_alloc_frag(skb, frag_hdrlen + len, wpan_hdr); | |
113 | if (IS_ERR(frag)) | |
8f8db918 | 114 | return PTR_ERR(frag); |
4dc315e2 AA |
115 | |
116 | memcpy(skb_put(frag, frag_hdrlen), frag_hdr, frag_hdrlen); | |
117 | memcpy(skb_put(frag, len), skb_network_header(skb) + offset, len); | |
118 | ||
119 | raw_dump_table(__func__, " fragment dump", frag->data, frag->len); | |
120 | ||
121 | return dev_queue_xmit(frag); | |
122 | } | |
123 | ||
124 | static int | |
f4606583 | 125 | lowpan_xmit_fragmented(struct sk_buff *skb, struct net_device *ldev, |
187625e1 AA |
126 | const struct ieee802154_hdr *wpan_hdr, u16 dgram_size, |
127 | u16 dgram_offset) | |
4dc315e2 | 128 | { |
4dc315e2 AA |
129 | __be16 frag_tag; |
130 | u8 frag_hdr[5]; | |
131 | int frag_cap, frag_len, payload_cap, rc; | |
132 | int skb_unprocessed, skb_offset; | |
133 | ||
f4606583 AA |
134 | frag_tag = htons(lowpan_dev_info(ldev)->fragment_tag); |
135 | lowpan_dev_info(ldev)->fragment_tag++; | |
4dc315e2 AA |
136 | |
137 | frag_hdr[0] = LOWPAN_DISPATCH_FRAG1 | ((dgram_size >> 8) & 0x07); | |
138 | frag_hdr[1] = dgram_size & 0xff; | |
139 | memcpy(frag_hdr + 2, &frag_tag, sizeof(frag_tag)); | |
140 | ||
141 | payload_cap = ieee802154_max_payload(wpan_hdr); | |
142 | ||
143 | frag_len = round_down(payload_cap - LOWPAN_FRAG1_HEAD_SIZE - | |
144 | skb_network_header_len(skb), 8); | |
145 | ||
146 | skb_offset = skb_network_header_len(skb); | |
147 | skb_unprocessed = skb->len - skb->mac_len - skb_offset; | |
148 | ||
149 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, | |
150 | LOWPAN_FRAG1_HEAD_SIZE, 0, | |
151 | frag_len + skb_network_header_len(skb)); | |
152 | if (rc) { | |
153 | pr_debug("%s unable to send FRAG1 packet (tag: %d)", | |
154 | __func__, ntohs(frag_tag)); | |
155 | goto err; | |
156 | } | |
157 | ||
158 | frag_hdr[0] &= ~LOWPAN_DISPATCH_FRAG1; | |
159 | frag_hdr[0] |= LOWPAN_DISPATCH_FRAGN; | |
160 | frag_cap = round_down(payload_cap - LOWPAN_FRAGN_HEAD_SIZE, 8); | |
161 | ||
162 | do { | |
163 | dgram_offset += frag_len; | |
164 | skb_offset += frag_len; | |
165 | skb_unprocessed -= frag_len; | |
166 | frag_len = min(frag_cap, skb_unprocessed); | |
167 | ||
168 | frag_hdr[4] = dgram_offset >> 3; | |
169 | ||
170 | rc = lowpan_xmit_fragment(skb, wpan_hdr, frag_hdr, | |
171 | LOWPAN_FRAGN_HEAD_SIZE, skb_offset, | |
172 | frag_len); | |
173 | if (rc) { | |
174 | pr_debug("%s unable to send a FRAGN packet. (tag: %d, offset: %d)\n", | |
175 | __func__, ntohs(frag_tag), skb_offset); | |
176 | goto err; | |
177 | } | |
178 | } while (skb_unprocessed > frag_cap); | |
179 | ||
180 | consume_skb(skb); | |
181 | return NET_XMIT_SUCCESS; | |
182 | ||
183 | err: | |
184 | kfree_skb(skb); | |
185 | return rc; | |
186 | } | |
187 | ||
187625e1 AA |
188 | static int lowpan_header(struct sk_buff *skb, struct net_device *ldev, |
189 | u16 *dgram_size, u16 *dgram_offset) | |
4dc315e2 | 190 | { |
f4606583 | 191 | struct wpan_dev *wpan_dev = lowpan_dev_info(ldev)->wdev->ieee802154_ptr; |
4dc315e2 AA |
192 | struct ieee802154_addr sa, da; |
193 | struct ieee802154_mac_cb *cb = mac_cb_init(skb); | |
194 | struct lowpan_addr_info info; | |
195 | void *daddr, *saddr; | |
196 | ||
197 | memcpy(&info, lowpan_skb_priv(skb), sizeof(info)); | |
198 | ||
199 | /* TODO: Currently we only support extended_addr */ | |
200 | daddr = &info.daddr.u.extended_addr; | |
201 | saddr = &info.saddr.u.extended_addr; | |
202 | ||
187625e1 | 203 | *dgram_size = skb->len; |
f4606583 | 204 | lowpan_header_compress(skb, ldev, ETH_P_IPV6, daddr, saddr, skb->len); |
187625e1 AA |
205 | /* dgram_offset = (saved bytes after compression) + lowpan header len */ |
206 | *dgram_offset = (*dgram_size - skb->len) + skb_network_header_len(skb); | |
4dc315e2 AA |
207 | |
208 | cb->type = IEEE802154_FC_TYPE_DATA; | |
209 | ||
210 | /* prepare wpan address data */ | |
211 | sa.mode = IEEE802154_ADDR_LONG; | |
1caf6f47 | 212 | sa.pan_id = wpan_dev->pan_id; |
4dc315e2 AA |
213 | sa.extended_addr = ieee802154_devaddr_from_raw(saddr); |
214 | ||
215 | /* intra-PAN communications */ | |
216 | da.pan_id = sa.pan_id; | |
217 | ||
218 | /* if the destination address is the broadcast address, use the | |
219 | * corresponding short address | |
220 | */ | |
221 | if (lowpan_is_addr_broadcast((const u8 *)daddr)) { | |
222 | da.mode = IEEE802154_ADDR_SHORT; | |
223 | da.short_addr = cpu_to_le16(IEEE802154_ADDR_BROADCAST); | |
224 | cb->ackreq = false; | |
225 | } else { | |
226 | da.mode = IEEE802154_ADDR_LONG; | |
227 | da.extended_addr = ieee802154_devaddr_from_raw(daddr); | |
c91208d8 | 228 | cb->ackreq = wpan_dev->ackreq; |
4dc315e2 AA |
229 | } |
230 | ||
f4606583 AA |
231 | return dev_hard_header(skb, lowpan_dev_info(ldev)->wdev, ETH_P_IPV6, |
232 | (void *)&da, (void *)&sa, 0); | |
4dc315e2 AA |
233 | } |
234 | ||
f4606583 | 235 | netdev_tx_t lowpan_xmit(struct sk_buff *skb, struct net_device *ldev) |
4dc315e2 AA |
236 | { |
237 | struct ieee802154_hdr wpan_hdr; | |
238 | int max_single, ret; | |
187625e1 | 239 | u16 dgram_size, dgram_offset; |
4dc315e2 AA |
240 | |
241 | pr_debug("package xmit\n"); | |
242 | ||
243 | /* We must take a copy of the skb before we modify/replace the ipv6 | |
244 | * header as the header could be used elsewhere | |
245 | */ | |
246 | skb = skb_unshare(skb, GFP_ATOMIC); | |
247 | if (!skb) | |
248 | return NET_XMIT_DROP; | |
249 | ||
187625e1 | 250 | ret = lowpan_header(skb, ldev, &dgram_size, &dgram_offset); |
4dc315e2 AA |
251 | if (ret < 0) { |
252 | kfree_skb(skb); | |
253 | return NET_XMIT_DROP; | |
254 | } | |
255 | ||
256 | if (ieee802154_hdr_peek(skb, &wpan_hdr) < 0) { | |
257 | kfree_skb(skb); | |
258 | return NET_XMIT_DROP; | |
259 | } | |
260 | ||
261 | max_single = ieee802154_max_payload(&wpan_hdr); | |
262 | ||
263 | if (skb_tail_pointer(skb) - skb_network_header(skb) <= max_single) { | |
f4606583 | 264 | skb->dev = lowpan_dev_info(ldev)->wdev; |
4dc315e2 AA |
265 | return dev_queue_xmit(skb); |
266 | } else { | |
267 | netdev_tx_t rc; | |
268 | ||
269 | pr_debug("frame is too big, fragmentation is needed\n"); | |
187625e1 AA |
270 | rc = lowpan_xmit_fragmented(skb, ldev, &wpan_hdr, dgram_size, |
271 | dgram_offset); | |
4dc315e2 AA |
272 | |
273 | return rc < 0 ? NET_XMIT_DROP : rc; | |
274 | } | |
275 | } |