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Commit | Line | Data |
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0744dd00 | 1 | #include <linux/skbuff.h> |
c452ed70 | 2 | #include <linux/export.h> |
0744dd00 ED |
3 | #include <linux/ip.h> |
4 | #include <linux/ipv6.h> | |
5 | #include <linux/if_vlan.h> | |
6 | #include <net/ip.h> | |
ddbe5032 | 7 | #include <net/ipv6.h> |
f77668dc DB |
8 | #include <linux/igmp.h> |
9 | #include <linux/icmp.h> | |
10 | #include <linux/sctp.h> | |
11 | #include <linux/dccp.h> | |
0744dd00 ED |
12 | #include <linux/if_tunnel.h> |
13 | #include <linux/if_pppox.h> | |
14 | #include <linux/ppp_defs.h> | |
15 | #include <net/flow_keys.h> | |
16 | ||
4d77d2b5 ED |
17 | /* copy saddr & daddr, possibly using 64bit load/store |
18 | * Equivalent to : flow->src = iph->saddr; | |
19 | * flow->dst = iph->daddr; | |
20 | */ | |
21 | static void iph_to_flow_copy_addrs(struct flow_keys *flow, const struct iphdr *iph) | |
22 | { | |
23 | BUILD_BUG_ON(offsetof(typeof(*flow), dst) != | |
24 | offsetof(typeof(*flow), src) + sizeof(flow->src)); | |
25 | memcpy(&flow->src, &iph->saddr, sizeof(flow->src) + sizeof(flow->dst)); | |
26 | } | |
0744dd00 | 27 | |
357afe9c NA |
28 | /** |
29 | * skb_flow_get_ports - extract the upper layer ports and return them | |
30 | * @skb: buffer to extract the ports from | |
31 | * @thoff: transport header offset | |
32 | * @ip_proto: protocol for which to get port offset | |
33 | * | |
34 | * The function will try to retrieve the ports at offset thoff + poff where poff | |
35 | * is the protocol port offset returned from proto_ports_offset | |
36 | */ | |
37 | __be32 skb_flow_get_ports(const struct sk_buff *skb, int thoff, u8 ip_proto) | |
38 | { | |
39 | int poff = proto_ports_offset(ip_proto); | |
40 | ||
41 | if (poff >= 0) { | |
42 | __be32 *ports, _ports; | |
43 | ||
44 | ports = skb_header_pointer(skb, thoff + poff, | |
45 | sizeof(_ports), &_ports); | |
46 | if (ports) | |
47 | return *ports; | |
48 | } | |
49 | ||
50 | return 0; | |
51 | } | |
52 | EXPORT_SYMBOL(skb_flow_get_ports); | |
53 | ||
0744dd00 ED |
54 | bool skb_flow_dissect(const struct sk_buff *skb, struct flow_keys *flow) |
55 | { | |
357afe9c | 56 | int nhoff = skb_network_offset(skb); |
0744dd00 ED |
57 | u8 ip_proto; |
58 | __be16 proto = skb->protocol; | |
59 | ||
60 | memset(flow, 0, sizeof(*flow)); | |
61 | ||
62 | again: | |
63 | switch (proto) { | |
2b8837ae | 64 | case htons(ETH_P_IP): { |
0744dd00 ED |
65 | const struct iphdr *iph; |
66 | struct iphdr _iph; | |
67 | ip: | |
68 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
6f092343 | 69 | if (!iph || iph->ihl < 5) |
0744dd00 | 70 | return false; |
3797d3e8 | 71 | nhoff += iph->ihl * 4; |
0744dd00 | 72 | |
3797d3e8 | 73 | ip_proto = iph->protocol; |
0744dd00 ED |
74 | if (ip_is_fragment(iph)) |
75 | ip_proto = 0; | |
3797d3e8 | 76 | |
4d77d2b5 | 77 | iph_to_flow_copy_addrs(flow, iph); |
0744dd00 ED |
78 | break; |
79 | } | |
2b8837ae | 80 | case htons(ETH_P_IPV6): { |
0744dd00 ED |
81 | const struct ipv6hdr *iph; |
82 | struct ipv6hdr _iph; | |
19469a87 TH |
83 | __be32 flow_label; |
84 | ||
0744dd00 ED |
85 | ipv6: |
86 | iph = skb_header_pointer(skb, nhoff, sizeof(_iph), &_iph); | |
87 | if (!iph) | |
88 | return false; | |
89 | ||
90 | ip_proto = iph->nexthdr; | |
ddbe5032 ED |
91 | flow->src = (__force __be32)ipv6_addr_hash(&iph->saddr); |
92 | flow->dst = (__force __be32)ipv6_addr_hash(&iph->daddr); | |
0744dd00 | 93 | nhoff += sizeof(struct ipv6hdr); |
19469a87 TH |
94 | |
95 | flow_label = ip6_flowlabel(iph); | |
96 | if (flow_label) { | |
97 | /* Awesome, IPv6 packet has a flow label so we can | |
98 | * use that to represent the ports without any | |
99 | * further dissection. | |
100 | */ | |
101 | flow->n_proto = proto; | |
102 | flow->ip_proto = ip_proto; | |
103 | flow->ports = flow_label; | |
104 | flow->thoff = (u16)nhoff; | |
105 | ||
106 | return true; | |
107 | } | |
108 | ||
0744dd00 ED |
109 | break; |
110 | } | |
2b8837ae JP |
111 | case htons(ETH_P_8021AD): |
112 | case htons(ETH_P_8021Q): { | |
0744dd00 ED |
113 | const struct vlan_hdr *vlan; |
114 | struct vlan_hdr _vlan; | |
115 | ||
116 | vlan = skb_header_pointer(skb, nhoff, sizeof(_vlan), &_vlan); | |
117 | if (!vlan) | |
118 | return false; | |
119 | ||
120 | proto = vlan->h_vlan_encapsulated_proto; | |
121 | nhoff += sizeof(*vlan); | |
122 | goto again; | |
123 | } | |
2b8837ae | 124 | case htons(ETH_P_PPP_SES): { |
0744dd00 ED |
125 | struct { |
126 | struct pppoe_hdr hdr; | |
127 | __be16 proto; | |
128 | } *hdr, _hdr; | |
129 | hdr = skb_header_pointer(skb, nhoff, sizeof(_hdr), &_hdr); | |
130 | if (!hdr) | |
131 | return false; | |
132 | proto = hdr->proto; | |
133 | nhoff += PPPOE_SES_HLEN; | |
134 | switch (proto) { | |
2b8837ae | 135 | case htons(PPP_IP): |
0744dd00 | 136 | goto ip; |
2b8837ae | 137 | case htons(PPP_IPV6): |
0744dd00 ED |
138 | goto ipv6; |
139 | default: | |
140 | return false; | |
141 | } | |
142 | } | |
143 | default: | |
144 | return false; | |
145 | } | |
146 | ||
147 | switch (ip_proto) { | |
148 | case IPPROTO_GRE: { | |
149 | struct gre_hdr { | |
150 | __be16 flags; | |
151 | __be16 proto; | |
152 | } *hdr, _hdr; | |
153 | ||
154 | hdr = skb_header_pointer(skb, nhoff, sizeof(_hdr), &_hdr); | |
155 | if (!hdr) | |
156 | return false; | |
157 | /* | |
158 | * Only look inside GRE if version zero and no | |
159 | * routing | |
160 | */ | |
161 | if (!(hdr->flags & (GRE_VERSION|GRE_ROUTING))) { | |
162 | proto = hdr->proto; | |
163 | nhoff += 4; | |
164 | if (hdr->flags & GRE_CSUM) | |
165 | nhoff += 4; | |
166 | if (hdr->flags & GRE_KEY) | |
167 | nhoff += 4; | |
168 | if (hdr->flags & GRE_SEQ) | |
169 | nhoff += 4; | |
e1733de2 MD |
170 | if (proto == htons(ETH_P_TEB)) { |
171 | const struct ethhdr *eth; | |
172 | struct ethhdr _eth; | |
173 | ||
174 | eth = skb_header_pointer(skb, nhoff, | |
175 | sizeof(_eth), &_eth); | |
176 | if (!eth) | |
177 | return false; | |
178 | proto = eth->h_proto; | |
179 | nhoff += sizeof(*eth); | |
180 | } | |
0744dd00 ED |
181 | goto again; |
182 | } | |
183 | break; | |
184 | } | |
185 | case IPPROTO_IPIP: | |
fca41895 TH |
186 | proto = htons(ETH_P_IP); |
187 | goto ip; | |
b438f940 TH |
188 | case IPPROTO_IPV6: |
189 | proto = htons(ETH_P_IPV6); | |
190 | goto ipv6; | |
0744dd00 ED |
191 | default: |
192 | break; | |
193 | } | |
194 | ||
e0f31d84 | 195 | flow->n_proto = proto; |
0744dd00 | 196 | flow->ip_proto = ip_proto; |
357afe9c | 197 | flow->ports = skb_flow_get_ports(skb, nhoff, ip_proto); |
8ed78166 DB |
198 | flow->thoff = (u16) nhoff; |
199 | ||
0744dd00 ED |
200 | return true; |
201 | } | |
202 | EXPORT_SYMBOL(skb_flow_dissect); | |
441d9d32 CW |
203 | |
204 | static u32 hashrnd __read_mostly; | |
66415cf8 HFS |
205 | static __always_inline void __flow_hash_secret_init(void) |
206 | { | |
207 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
208 | } | |
209 | ||
210 | static __always_inline u32 __flow_hash_3words(u32 a, u32 b, u32 c) | |
211 | { | |
212 | __flow_hash_secret_init(); | |
213 | return jhash_3words(a, b, c, hashrnd); | |
214 | } | |
215 | ||
5ed20a68 TH |
216 | static inline u32 __flow_hash_from_keys(struct flow_keys *keys) |
217 | { | |
218 | u32 hash; | |
219 | ||
220 | /* get a consistent hash (same value on both flow directions) */ | |
221 | if (((__force u32)keys->dst < (__force u32)keys->src) || | |
222 | (((__force u32)keys->dst == (__force u32)keys->src) && | |
223 | ((__force u16)keys->port16[1] < (__force u16)keys->port16[0]))) { | |
224 | swap(keys->dst, keys->src); | |
225 | swap(keys->port16[0], keys->port16[1]); | |
226 | } | |
227 | ||
228 | hash = __flow_hash_3words((__force u32)keys->dst, | |
229 | (__force u32)keys->src, | |
230 | (__force u32)keys->ports); | |
231 | if (!hash) | |
232 | hash = 1; | |
233 | ||
234 | return hash; | |
235 | } | |
236 | ||
237 | u32 flow_hash_from_keys(struct flow_keys *keys) | |
238 | { | |
239 | return __flow_hash_from_keys(keys); | |
240 | } | |
241 | EXPORT_SYMBOL(flow_hash_from_keys); | |
242 | ||
441d9d32 | 243 | /* |
3958afa1 | 244 | * __skb_get_hash: calculate a flow hash based on src/dst addresses |
61b905da TH |
245 | * and src/dst port numbers. Sets hash in skb to non-zero hash value |
246 | * on success, zero indicates no valid hash. Also, sets l4_hash in skb | |
441d9d32 CW |
247 | * if hash is a canonical 4-tuple hash over transport ports. |
248 | */ | |
3958afa1 | 249 | void __skb_get_hash(struct sk_buff *skb) |
441d9d32 CW |
250 | { |
251 | struct flow_keys keys; | |
441d9d32 CW |
252 | |
253 | if (!skb_flow_dissect(skb, &keys)) | |
254 | return; | |
255 | ||
256 | if (keys.ports) | |
61b905da | 257 | skb->l4_hash = 1; |
441d9d32 | 258 | |
a3b18ddb TH |
259 | skb->sw_hash = 1; |
260 | ||
5ed20a68 | 261 | skb->hash = __flow_hash_from_keys(&keys); |
441d9d32 | 262 | } |
3958afa1 | 263 | EXPORT_SYMBOL(__skb_get_hash); |
441d9d32 CW |
264 | |
265 | /* | |
266 | * Returns a Tx hash based on the given packet descriptor a Tx queues' number | |
267 | * to be used as a distribution range. | |
268 | */ | |
0e001614 | 269 | u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb, |
441d9d32 CW |
270 | unsigned int num_tx_queues) |
271 | { | |
272 | u32 hash; | |
273 | u16 qoffset = 0; | |
274 | u16 qcount = num_tx_queues; | |
275 | ||
276 | if (skb_rx_queue_recorded(skb)) { | |
277 | hash = skb_get_rx_queue(skb); | |
278 | while (unlikely(hash >= num_tx_queues)) | |
279 | hash -= num_tx_queues; | |
280 | return hash; | |
281 | } | |
282 | ||
283 | if (dev->num_tc) { | |
284 | u8 tc = netdev_get_prio_tc_map(dev, skb->priority); | |
285 | qoffset = dev->tc_to_txq[tc].offset; | |
286 | qcount = dev->tc_to_txq[tc].count; | |
287 | } | |
288 | ||
0e001614 | 289 | return (u16) (((u64)skb_get_hash(skb) * qcount) >> 32) + qoffset; |
441d9d32 CW |
290 | } |
291 | EXPORT_SYMBOL(__skb_tx_hash); | |
292 | ||
f77668dc DB |
293 | /* __skb_get_poff() returns the offset to the payload as far as it could |
294 | * be dissected. The main user is currently BPF, so that we can dynamically | |
295 | * truncate packets without needing to push actual payload to the user | |
296 | * space and can analyze headers only, instead. | |
297 | */ | |
298 | u32 __skb_get_poff(const struct sk_buff *skb) | |
299 | { | |
300 | struct flow_keys keys; | |
301 | u32 poff = 0; | |
302 | ||
303 | if (!skb_flow_dissect(skb, &keys)) | |
304 | return 0; | |
305 | ||
306 | poff += keys.thoff; | |
307 | switch (keys.ip_proto) { | |
308 | case IPPROTO_TCP: { | |
309 | const struct tcphdr *tcph; | |
310 | struct tcphdr _tcph; | |
311 | ||
312 | tcph = skb_header_pointer(skb, poff, sizeof(_tcph), &_tcph); | |
313 | if (!tcph) | |
314 | return poff; | |
315 | ||
316 | poff += max_t(u32, sizeof(struct tcphdr), tcph->doff * 4); | |
317 | break; | |
318 | } | |
319 | case IPPROTO_UDP: | |
320 | case IPPROTO_UDPLITE: | |
321 | poff += sizeof(struct udphdr); | |
322 | break; | |
323 | /* For the rest, we do not really care about header | |
324 | * extensions at this point for now. | |
325 | */ | |
326 | case IPPROTO_ICMP: | |
327 | poff += sizeof(struct icmphdr); | |
328 | break; | |
329 | case IPPROTO_ICMPV6: | |
330 | poff += sizeof(struct icmp6hdr); | |
331 | break; | |
332 | case IPPROTO_IGMP: | |
333 | poff += sizeof(struct igmphdr); | |
334 | break; | |
335 | case IPPROTO_DCCP: | |
336 | poff += sizeof(struct dccp_hdr); | |
337 | break; | |
338 | case IPPROTO_SCTP: | |
339 | poff += sizeof(struct sctphdr); | |
340 | break; | |
341 | } | |
342 | ||
343 | return poff; | |
344 | } | |
345 | ||
441d9d32 CW |
346 | static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb) |
347 | { | |
348 | #ifdef CONFIG_XPS | |
349 | struct xps_dev_maps *dev_maps; | |
350 | struct xps_map *map; | |
351 | int queue_index = -1; | |
352 | ||
353 | rcu_read_lock(); | |
354 | dev_maps = rcu_dereference(dev->xps_maps); | |
355 | if (dev_maps) { | |
356 | map = rcu_dereference( | |
357 | dev_maps->cpu_map[raw_smp_processor_id()]); | |
358 | if (map) { | |
359 | if (map->len == 1) | |
360 | queue_index = map->queues[0]; | |
0e001614 | 361 | else |
441d9d32 | 362 | queue_index = map->queues[ |
0e001614 TH |
363 | ((u64)skb_get_hash(skb) * map->len) >> 32]; |
364 | ||
441d9d32 CW |
365 | if (unlikely(queue_index >= dev->real_num_tx_queues)) |
366 | queue_index = -1; | |
367 | } | |
368 | } | |
369 | rcu_read_unlock(); | |
370 | ||
371 | return queue_index; | |
372 | #else | |
373 | return -1; | |
374 | #endif | |
375 | } | |
376 | ||
99932d4f | 377 | static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb) |
441d9d32 CW |
378 | { |
379 | struct sock *sk = skb->sk; | |
380 | int queue_index = sk_tx_queue_get(sk); | |
381 | ||
382 | if (queue_index < 0 || skb->ooo_okay || | |
383 | queue_index >= dev->real_num_tx_queues) { | |
384 | int new_index = get_xps_queue(dev, skb); | |
385 | if (new_index < 0) | |
386 | new_index = skb_tx_hash(dev, skb); | |
387 | ||
702821f4 ED |
388 | if (queue_index != new_index && sk && |
389 | rcu_access_pointer(sk->sk_dst_cache)) | |
50d1784e | 390 | sk_tx_queue_set(sk, new_index); |
441d9d32 CW |
391 | |
392 | queue_index = new_index; | |
393 | } | |
394 | ||
395 | return queue_index; | |
396 | } | |
441d9d32 CW |
397 | |
398 | struct netdev_queue *netdev_pick_tx(struct net_device *dev, | |
f663dd9a JW |
399 | struct sk_buff *skb, |
400 | void *accel_priv) | |
441d9d32 CW |
401 | { |
402 | int queue_index = 0; | |
403 | ||
404 | if (dev->real_num_tx_queues != 1) { | |
405 | const struct net_device_ops *ops = dev->netdev_ops; | |
406 | if (ops->ndo_select_queue) | |
99932d4f DB |
407 | queue_index = ops->ndo_select_queue(dev, skb, accel_priv, |
408 | __netdev_pick_tx); | |
441d9d32 CW |
409 | else |
410 | queue_index = __netdev_pick_tx(dev, skb); | |
f663dd9a JW |
411 | |
412 | if (!accel_priv) | |
b9507bda | 413 | queue_index = netdev_cap_txqueue(dev, queue_index); |
441d9d32 CW |
414 | } |
415 | ||
416 | skb_set_queue_mapping(skb, queue_index); | |
417 | return netdev_get_tx_queue(dev, queue_index); | |
418 | } |