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457c8996 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
7d208687 FF |
2 | #include <linux/kernel.h> |
3 | #include <linux/init.h> | |
4 | #include <linux/module.h> | |
5 | #include <linux/netfilter.h> | |
6 | #include <linux/rhashtable.h> | |
7 | #include <linux/ip.h> | |
a908fdec | 8 | #include <linux/ipv6.h> |
7d208687 | 9 | #include <linux/netdevice.h> |
72efd585 PNA |
10 | #include <linux/if_ether.h> |
11 | #include <linux/if_pppox.h> | |
12 | #include <linux/ppp_defs.h> | |
7d208687 | 13 | #include <net/ip.h> |
a908fdec FF |
14 | #include <net/ipv6.h> |
15 | #include <net/ip6_route.h> | |
7d208687 FF |
16 | #include <net/neighbour.h> |
17 | #include <net/netfilter/nf_flow_table.h> | |
53c2b289 | 18 | #include <net/netfilter/nf_conntrack_acct.h> |
7d208687 FF |
19 | /* For layer 4 checksum field offset. */ |
20 | #include <linux/tcp.h> | |
21 | #include <linux/udp.h> | |
22 | ||
33894c36 FF |
23 | static int nf_flow_state_check(struct flow_offload *flow, int proto, |
24 | struct sk_buff *skb, unsigned int thoff) | |
b6f27d32 FF |
25 | { |
26 | struct tcphdr *tcph; | |
27 | ||
33894c36 FF |
28 | if (proto != IPPROTO_TCP) |
29 | return 0; | |
30 | ||
b6f27d32 FF |
31 | tcph = (void *)(skb_network_header(skb) + thoff); |
32 | if (unlikely(tcph->fin || tcph->rst)) { | |
33 | flow_offload_teardown(flow); | |
34 | return -1; | |
35 | } | |
36 | ||
37 | return 0; | |
38 | } | |
39 | ||
f4401262 PNA |
40 | static void nf_flow_nat_ip_tcp(struct sk_buff *skb, unsigned int thoff, |
41 | __be32 addr, __be32 new_addr) | |
7d208687 FF |
42 | { |
43 | struct tcphdr *tcph; | |
44 | ||
7d208687 FF |
45 | tcph = (void *)(skb_network_header(skb) + thoff); |
46 | inet_proto_csum_replace4(&tcph->check, skb, addr, new_addr, true); | |
7d208687 FF |
47 | } |
48 | ||
f4401262 PNA |
49 | static void nf_flow_nat_ip_udp(struct sk_buff *skb, unsigned int thoff, |
50 | __be32 addr, __be32 new_addr) | |
7d208687 FF |
51 | { |
52 | struct udphdr *udph; | |
53 | ||
7d208687 FF |
54 | udph = (void *)(skb_network_header(skb) + thoff); |
55 | if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
56 | inet_proto_csum_replace4(&udph->check, skb, addr, | |
57 | new_addr, true); | |
58 | if (!udph->check) | |
59 | udph->check = CSUM_MANGLED_0; | |
60 | } | |
7d208687 FF |
61 | } |
62 | ||
f4401262 PNA |
63 | static void nf_flow_nat_ip_l4proto(struct sk_buff *skb, struct iphdr *iph, |
64 | unsigned int thoff, __be32 addr, | |
65 | __be32 new_addr) | |
7d208687 FF |
66 | { |
67 | switch (iph->protocol) { | |
68 | case IPPROTO_TCP: | |
f4401262 | 69 | nf_flow_nat_ip_tcp(skb, thoff, addr, new_addr); |
7d208687 FF |
70 | break; |
71 | case IPPROTO_UDP: | |
f4401262 | 72 | nf_flow_nat_ip_udp(skb, thoff, addr, new_addr); |
7d208687 FF |
73 | break; |
74 | } | |
7d208687 FF |
75 | } |
76 | ||
f4401262 PNA |
77 | static void nf_flow_snat_ip(const struct flow_offload *flow, |
78 | struct sk_buff *skb, struct iphdr *iph, | |
79 | unsigned int thoff, enum flow_offload_tuple_dir dir) | |
7d208687 FF |
80 | { |
81 | __be32 addr, new_addr; | |
82 | ||
83 | switch (dir) { | |
84 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
85 | addr = iph->saddr; | |
86 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v4.s_addr; | |
87 | iph->saddr = new_addr; | |
88 | break; | |
89 | case FLOW_OFFLOAD_DIR_REPLY: | |
90 | addr = iph->daddr; | |
91 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v4.s_addr; | |
92 | iph->daddr = new_addr; | |
93 | break; | |
7d208687 FF |
94 | } |
95 | csum_replace4(&iph->check, addr, new_addr); | |
96 | ||
f4401262 | 97 | nf_flow_nat_ip_l4proto(skb, iph, thoff, addr, new_addr); |
7d208687 FF |
98 | } |
99 | ||
f4401262 PNA |
100 | static void nf_flow_dnat_ip(const struct flow_offload *flow, |
101 | struct sk_buff *skb, struct iphdr *iph, | |
102 | unsigned int thoff, enum flow_offload_tuple_dir dir) | |
7d208687 FF |
103 | { |
104 | __be32 addr, new_addr; | |
105 | ||
106 | switch (dir) { | |
107 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
108 | addr = iph->daddr; | |
109 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v4.s_addr; | |
110 | iph->daddr = new_addr; | |
111 | break; | |
112 | case FLOW_OFFLOAD_DIR_REPLY: | |
113 | addr = iph->saddr; | |
114 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v4.s_addr; | |
115 | iph->saddr = new_addr; | |
116 | break; | |
7d208687 FF |
117 | } |
118 | csum_replace4(&iph->check, addr, new_addr); | |
119 | ||
f4401262 | 120 | nf_flow_nat_ip_l4proto(skb, iph, thoff, addr, new_addr); |
7d208687 FF |
121 | } |
122 | ||
f4401262 | 123 | static void nf_flow_nat_ip(const struct flow_offload *flow, struct sk_buff *skb, |
2fc11745 PNA |
124 | unsigned int thoff, enum flow_offload_tuple_dir dir, |
125 | struct iphdr *iph) | |
7d208687 | 126 | { |
f4401262 PNA |
127 | if (test_bit(NF_FLOW_SNAT, &flow->flags)) { |
128 | nf_flow_snat_port(flow, skb, thoff, iph->protocol, dir); | |
129 | nf_flow_snat_ip(flow, skb, iph, thoff, dir); | |
130 | } | |
131 | if (test_bit(NF_FLOW_DNAT, &flow->flags)) { | |
132 | nf_flow_dnat_port(flow, skb, thoff, iph->protocol, dir); | |
133 | nf_flow_dnat_ip(flow, skb, iph, thoff, dir); | |
134 | } | |
7d208687 FF |
135 | } |
136 | ||
137 | static bool ip_has_options(unsigned int thoff) | |
138 | { | |
139 | return thoff != sizeof(struct iphdr); | |
140 | } | |
141 | ||
4cd91f7c PNA |
142 | static void nf_flow_tuple_encap(struct sk_buff *skb, |
143 | struct flow_offload_tuple *tuple) | |
144 | { | |
72efd585 PNA |
145 | struct vlan_ethhdr *veth; |
146 | struct pppoe_hdr *phdr; | |
4cd91f7c PNA |
147 | int i = 0; |
148 | ||
149 | if (skb_vlan_tag_present(skb)) { | |
150 | tuple->encap[i].id = skb_vlan_tag_get(skb); | |
151 | tuple->encap[i].proto = skb->vlan_proto; | |
152 | i++; | |
153 | } | |
72efd585 PNA |
154 | switch (skb->protocol) { |
155 | case htons(ETH_P_8021Q): | |
156 | veth = (struct vlan_ethhdr *)skb_mac_header(skb); | |
4cd91f7c PNA |
157 | tuple->encap[i].id = ntohs(veth->h_vlan_TCI); |
158 | tuple->encap[i].proto = skb->protocol; | |
72efd585 PNA |
159 | break; |
160 | case htons(ETH_P_PPP_SES): | |
161 | phdr = (struct pppoe_hdr *)skb_mac_header(skb); | |
162 | tuple->encap[i].id = ntohs(phdr->sid); | |
163 | tuple->encap[i].proto = skb->protocol; | |
164 | break; | |
4cd91f7c PNA |
165 | } |
166 | } | |
167 | ||
7d208687 | 168 | static int nf_flow_tuple_ip(struct sk_buff *skb, const struct net_device *dev, |
4cd91f7c PNA |
169 | struct flow_offload_tuple *tuple, u32 *hdrsize, |
170 | u32 offset) | |
7d208687 FF |
171 | { |
172 | struct flow_ports *ports; | |
2fc11745 | 173 | unsigned int thoff; |
7d208687 FF |
174 | struct iphdr *iph; |
175 | ||
4cd91f7c | 176 | if (!pskb_may_pull(skb, sizeof(*iph) + offset)) |
7d208687 FF |
177 | return -1; |
178 | ||
4cd91f7c PNA |
179 | iph = (struct iphdr *)(skb_network_header(skb) + offset); |
180 | thoff = (iph->ihl * 4); | |
7d208687 FF |
181 | |
182 | if (ip_is_fragment(iph) || | |
183 | unlikely(ip_has_options(thoff))) | |
184 | return -1; | |
185 | ||
4cd91f7c PNA |
186 | thoff += offset; |
187 | ||
793d5d61 PNA |
188 | switch (iph->protocol) { |
189 | case IPPROTO_TCP: | |
2fc11745 | 190 | *hdrsize = sizeof(struct tcphdr); |
793d5d61 PNA |
191 | break; |
192 | case IPPROTO_UDP: | |
2fc11745 | 193 | *hdrsize = sizeof(struct udphdr); |
793d5d61 PNA |
194 | break; |
195 | default: | |
7d208687 | 196 | return -1; |
793d5d61 | 197 | } |
7d208687 | 198 | |
33cc3c0c TY |
199 | if (iph->ttl <= 1) |
200 | return -1; | |
201 | ||
2fc11745 | 202 | if (!pskb_may_pull(skb, thoff + *hdrsize)) |
7d208687 FF |
203 | return -1; |
204 | ||
4cd91f7c | 205 | iph = (struct iphdr *)(skb_network_header(skb) + offset); |
7d208687 FF |
206 | ports = (struct flow_ports *)(skb_network_header(skb) + thoff); |
207 | ||
208 | tuple->src_v4.s_addr = iph->saddr; | |
209 | tuple->dst_v4.s_addr = iph->daddr; | |
210 | tuple->src_port = ports->source; | |
211 | tuple->dst_port = ports->dest; | |
212 | tuple->l3proto = AF_INET; | |
213 | tuple->l4proto = iph->protocol; | |
214 | tuple->iifidx = dev->ifindex; | |
4cd91f7c | 215 | nf_flow_tuple_encap(skb, tuple); |
7d208687 FF |
216 | |
217 | return 0; | |
218 | } | |
219 | ||
220 | /* Based on ip_exceeds_mtu(). */ | |
221 | static bool nf_flow_exceeds_mtu(const struct sk_buff *skb, unsigned int mtu) | |
222 | { | |
223 | if (skb->len <= mtu) | |
224 | return false; | |
225 | ||
7d208687 FF |
226 | if (skb_is_gso(skb) && skb_gso_validate_network_len(skb, mtu)) |
227 | return false; | |
228 | ||
229 | return true; | |
230 | } | |
231 | ||
589b474a FW |
232 | static unsigned int nf_flow_xmit_xfrm(struct sk_buff *skb, |
233 | const struct nf_hook_state *state, | |
234 | struct dst_entry *dst) | |
235 | { | |
236 | skb_orphan(skb); | |
237 | skb_dst_set_noref(skb, dst); | |
589b474a FW |
238 | dst_output(state->net, state->sk, skb); |
239 | return NF_STOLEN; | |
240 | } | |
241 | ||
72efd585 PNA |
242 | static inline __be16 nf_flow_pppoe_proto(const struct sk_buff *skb) |
243 | { | |
244 | __be16 proto; | |
245 | ||
246 | proto = *((__be16 *)(skb_mac_header(skb) + ETH_HLEN + | |
247 | sizeof(struct pppoe_hdr))); | |
248 | switch (proto) { | |
249 | case htons(PPP_IP): | |
250 | return htons(ETH_P_IP); | |
251 | case htons(PPP_IPV6): | |
252 | return htons(ETH_P_IPV6); | |
253 | } | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
4cd91f7c PNA |
258 | static bool nf_flow_skb_encap_protocol(const struct sk_buff *skb, __be16 proto, |
259 | u32 *offset) | |
260 | { | |
72efd585 | 261 | struct vlan_ethhdr *veth; |
4cd91f7c | 262 | |
72efd585 PNA |
263 | switch (skb->protocol) { |
264 | case htons(ETH_P_8021Q): | |
4cd91f7c PNA |
265 | veth = (struct vlan_ethhdr *)skb_mac_header(skb); |
266 | if (veth->h_vlan_encapsulated_proto == proto) { | |
267 | *offset += VLAN_HLEN; | |
268 | return true; | |
269 | } | |
72efd585 PNA |
270 | break; |
271 | case htons(ETH_P_PPP_SES): | |
272 | if (nf_flow_pppoe_proto(skb) == proto) { | |
273 | *offset += PPPOE_SES_HLEN; | |
274 | return true; | |
275 | } | |
276 | break; | |
4cd91f7c PNA |
277 | } |
278 | ||
279 | return false; | |
280 | } | |
281 | ||
282 | static void nf_flow_encap_pop(struct sk_buff *skb, | |
283 | struct flow_offload_tuple_rhash *tuplehash) | |
284 | { | |
285 | struct vlan_hdr *vlan_hdr; | |
286 | int i; | |
287 | ||
288 | for (i = 0; i < tuplehash->tuple.encap_num; i++) { | |
289 | if (skb_vlan_tag_present(skb)) { | |
290 | __vlan_hwaccel_clear_tag(skb); | |
291 | continue; | |
292 | } | |
72efd585 PNA |
293 | switch (skb->protocol) { |
294 | case htons(ETH_P_8021Q): | |
4cd91f7c PNA |
295 | vlan_hdr = (struct vlan_hdr *)skb->data; |
296 | __skb_pull(skb, VLAN_HLEN); | |
297 | vlan_set_encap_proto(skb, vlan_hdr); | |
298 | skb_reset_network_header(skb); | |
299 | break; | |
72efd585 PNA |
300 | case htons(ETH_P_PPP_SES): |
301 | skb->protocol = nf_flow_pppoe_proto(skb); | |
302 | skb_pull(skb, PPPOE_SES_HLEN); | |
303 | skb_reset_network_header(skb); | |
304 | break; | |
4cd91f7c PNA |
305 | } |
306 | } | |
307 | } | |
308 | ||
7a27f6ab PNA |
309 | static unsigned int nf_flow_queue_xmit(struct net *net, struct sk_buff *skb, |
310 | const struct flow_offload_tuple_rhash *tuplehash, | |
311 | unsigned short type) | |
312 | { | |
313 | struct net_device *outdev; | |
314 | ||
315 | outdev = dev_get_by_index_rcu(net, tuplehash->tuple.out.ifidx); | |
316 | if (!outdev) | |
317 | return NF_DROP; | |
318 | ||
319 | skb->dev = outdev; | |
320 | dev_hard_header(skb, skb->dev, type, tuplehash->tuple.out.h_dest, | |
321 | tuplehash->tuple.out.h_source, skb->len); | |
322 | dev_queue_xmit(skb); | |
323 | ||
324 | return NF_STOLEN; | |
325 | } | |
326 | ||
7d208687 FF |
327 | unsigned int |
328 | nf_flow_offload_ip_hook(void *priv, struct sk_buff *skb, | |
329 | const struct nf_hook_state *state) | |
330 | { | |
331 | struct flow_offload_tuple_rhash *tuplehash; | |
332 | struct nf_flowtable *flow_table = priv; | |
333 | struct flow_offload_tuple tuple = {}; | |
334 | enum flow_offload_tuple_dir dir; | |
335 | struct flow_offload *flow; | |
336 | struct net_device *outdev; | |
4cd91f7c PNA |
337 | u32 hdrsize, offset = 0; |
338 | unsigned int thoff, mtu; | |
2a79fd39 | 339 | struct rtable *rt; |
7d208687 FF |
340 | struct iphdr *iph; |
341 | __be32 nexthop; | |
7a27f6ab | 342 | int ret; |
7d208687 | 343 | |
4cd91f7c PNA |
344 | if (skb->protocol != htons(ETH_P_IP) && |
345 | !nf_flow_skb_encap_protocol(skb, htons(ETH_P_IP), &offset)) | |
7d208687 FF |
346 | return NF_ACCEPT; |
347 | ||
4cd91f7c | 348 | if (nf_flow_tuple_ip(skb, state->in, &tuple, &hdrsize, offset) < 0) |
7d208687 FF |
349 | return NF_ACCEPT; |
350 | ||
351 | tuplehash = flow_offload_lookup(flow_table, &tuple); | |
352 | if (tuplehash == NULL) | |
353 | return NF_ACCEPT; | |
354 | ||
7d208687 FF |
355 | dir = tuplehash->tuple.dir; |
356 | flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); | |
7d208687 | 357 | |
4cd91f7c PNA |
358 | mtu = flow->tuplehash[dir].tuple.mtu + offset; |
359 | if (unlikely(nf_flow_exceeds_mtu(skb, mtu))) | |
7d208687 FF |
360 | return NF_ACCEPT; |
361 | ||
4cd91f7c PNA |
362 | iph = (struct iphdr *)(skb_network_header(skb) + offset); |
363 | thoff = (iph->ihl * 4) + offset; | |
2fc11745 | 364 | if (nf_flow_state_check(flow, iph->protocol, skb, thoff)) |
b6f27d32 FF |
365 | return NF_ACCEPT; |
366 | ||
7a27f6ab PNA |
367 | if (tuplehash->tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH || |
368 | tuplehash->tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM) { | |
369 | rt = (struct rtable *)tuplehash->tuple.dst_cache; | |
370 | if (!dst_check(&rt->dst, 0)) { | |
371 | flow_offload_teardown(flow); | |
372 | return NF_ACCEPT; | |
373 | } | |
589b474a FW |
374 | } |
375 | ||
2babb46c PNA |
376 | if (skb_try_make_writable(skb, thoff + hdrsize)) |
377 | return NF_DROP; | |
378 | ||
1b9cd769 PNA |
379 | flow_offload_refresh(flow_table, flow); |
380 | ||
4cd91f7c PNA |
381 | nf_flow_encap_pop(skb, tuplehash); |
382 | thoff -= offset; | |
383 | ||
2babb46c | 384 | iph = ip_hdr(skb); |
f4401262 | 385 | nf_flow_nat_ip(flow, skb, thoff, dir, iph); |
7d208687 | 386 | |
7d208687 | 387 | ip_decrease_ttl(iph); |
de20900f | 388 | skb->tstamp = 0; |
7d208687 | 389 | |
53c2b289 PNA |
390 | if (flow_table->flags & NF_FLOWTABLE_COUNTER) |
391 | nf_ct_acct_update(flow->ct, tuplehash->tuple.dir, skb->len); | |
392 | ||
5139c0c0 | 393 | if (unlikely(tuplehash->tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)) { |
589b474a FW |
394 | memset(skb->cb, 0, sizeof(struct inet_skb_parm)); |
395 | IPCB(skb)->iif = skb->dev->ifindex; | |
396 | IPCB(skb)->flags = IPSKB_FORWARDED; | |
397 | return nf_flow_xmit_xfrm(skb, state, &rt->dst); | |
398 | } | |
399 | ||
7a27f6ab PNA |
400 | switch (tuplehash->tuple.xmit_type) { |
401 | case FLOW_OFFLOAD_XMIT_NEIGH: | |
402 | outdev = rt->dst.dev; | |
403 | skb->dev = outdev; | |
404 | nexthop = rt_nexthop(rt, flow->tuplehash[!dir].tuple.src_v4.s_addr); | |
405 | skb_dst_set_noref(skb, &rt->dst); | |
406 | neigh_xmit(NEIGH_ARP_TABLE, outdev, &nexthop, skb); | |
407 | ret = NF_STOLEN; | |
408 | break; | |
409 | case FLOW_OFFLOAD_XMIT_DIRECT: | |
410 | ret = nf_flow_queue_xmit(state->net, skb, tuplehash, ETH_P_IP); | |
411 | if (ret == NF_DROP) | |
412 | flow_offload_teardown(flow); | |
413 | break; | |
414 | } | |
7d208687 | 415 | |
7a27f6ab | 416 | return ret; |
7d208687 FF |
417 | } |
418 | EXPORT_SYMBOL_GPL(nf_flow_offload_ip_hook); | |
a908fdec | 419 | |
f4401262 PNA |
420 | static void nf_flow_nat_ipv6_tcp(struct sk_buff *skb, unsigned int thoff, |
421 | struct in6_addr *addr, | |
422 | struct in6_addr *new_addr, | |
423 | struct ipv6hdr *ip6h) | |
a908fdec FF |
424 | { |
425 | struct tcphdr *tcph; | |
426 | ||
a908fdec FF |
427 | tcph = (void *)(skb_network_header(skb) + thoff); |
428 | inet_proto_csum_replace16(&tcph->check, skb, addr->s6_addr32, | |
429 | new_addr->s6_addr32, true); | |
a908fdec FF |
430 | } |
431 | ||
f4401262 PNA |
432 | static void nf_flow_nat_ipv6_udp(struct sk_buff *skb, unsigned int thoff, |
433 | struct in6_addr *addr, | |
434 | struct in6_addr *new_addr) | |
a908fdec FF |
435 | { |
436 | struct udphdr *udph; | |
437 | ||
a908fdec FF |
438 | udph = (void *)(skb_network_header(skb) + thoff); |
439 | if (udph->check || skb->ip_summed == CHECKSUM_PARTIAL) { | |
440 | inet_proto_csum_replace16(&udph->check, skb, addr->s6_addr32, | |
441 | new_addr->s6_addr32, true); | |
442 | if (!udph->check) | |
443 | udph->check = CSUM_MANGLED_0; | |
444 | } | |
a908fdec FF |
445 | } |
446 | ||
f4401262 PNA |
447 | static void nf_flow_nat_ipv6_l4proto(struct sk_buff *skb, struct ipv6hdr *ip6h, |
448 | unsigned int thoff, struct in6_addr *addr, | |
449 | struct in6_addr *new_addr) | |
a908fdec FF |
450 | { |
451 | switch (ip6h->nexthdr) { | |
452 | case IPPROTO_TCP: | |
f4401262 | 453 | nf_flow_nat_ipv6_tcp(skb, thoff, addr, new_addr, ip6h); |
a908fdec FF |
454 | break; |
455 | case IPPROTO_UDP: | |
f4401262 | 456 | nf_flow_nat_ipv6_udp(skb, thoff, addr, new_addr); |
a908fdec FF |
457 | break; |
458 | } | |
a908fdec FF |
459 | } |
460 | ||
f4401262 PNA |
461 | static void nf_flow_snat_ipv6(const struct flow_offload *flow, |
462 | struct sk_buff *skb, struct ipv6hdr *ip6h, | |
463 | unsigned int thoff, | |
464 | enum flow_offload_tuple_dir dir) | |
a908fdec FF |
465 | { |
466 | struct in6_addr addr, new_addr; | |
467 | ||
468 | switch (dir) { | |
469 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
470 | addr = ip6h->saddr; | |
471 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.dst_v6; | |
472 | ip6h->saddr = new_addr; | |
473 | break; | |
474 | case FLOW_OFFLOAD_DIR_REPLY: | |
475 | addr = ip6h->daddr; | |
476 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.src_v6; | |
477 | ip6h->daddr = new_addr; | |
478 | break; | |
a908fdec FF |
479 | } |
480 | ||
f4401262 | 481 | nf_flow_nat_ipv6_l4proto(skb, ip6h, thoff, &addr, &new_addr); |
a908fdec FF |
482 | } |
483 | ||
f4401262 PNA |
484 | static void nf_flow_dnat_ipv6(const struct flow_offload *flow, |
485 | struct sk_buff *skb, struct ipv6hdr *ip6h, | |
486 | unsigned int thoff, | |
487 | enum flow_offload_tuple_dir dir) | |
a908fdec FF |
488 | { |
489 | struct in6_addr addr, new_addr; | |
490 | ||
491 | switch (dir) { | |
492 | case FLOW_OFFLOAD_DIR_ORIGINAL: | |
493 | addr = ip6h->daddr; | |
494 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_REPLY].tuple.src_v6; | |
495 | ip6h->daddr = new_addr; | |
496 | break; | |
497 | case FLOW_OFFLOAD_DIR_REPLY: | |
498 | addr = ip6h->saddr; | |
499 | new_addr = flow->tuplehash[FLOW_OFFLOAD_DIR_ORIGINAL].tuple.dst_v6; | |
500 | ip6h->saddr = new_addr; | |
501 | break; | |
a908fdec FF |
502 | } |
503 | ||
f4401262 | 504 | nf_flow_nat_ipv6_l4proto(skb, ip6h, thoff, &addr, &new_addr); |
a908fdec FF |
505 | } |
506 | ||
f4401262 PNA |
507 | static void nf_flow_nat_ipv6(const struct flow_offload *flow, |
508 | struct sk_buff *skb, | |
509 | enum flow_offload_tuple_dir dir, | |
510 | struct ipv6hdr *ip6h) | |
a908fdec | 511 | { |
a908fdec FF |
512 | unsigned int thoff = sizeof(*ip6h); |
513 | ||
f4401262 PNA |
514 | if (test_bit(NF_FLOW_SNAT, &flow->flags)) { |
515 | nf_flow_snat_port(flow, skb, thoff, ip6h->nexthdr, dir); | |
516 | nf_flow_snat_ipv6(flow, skb, ip6h, thoff, dir); | |
517 | } | |
518 | if (test_bit(NF_FLOW_DNAT, &flow->flags)) { | |
519 | nf_flow_dnat_port(flow, skb, thoff, ip6h->nexthdr, dir); | |
520 | nf_flow_dnat_ipv6(flow, skb, ip6h, thoff, dir); | |
521 | } | |
a908fdec FF |
522 | } |
523 | ||
524 | static int nf_flow_tuple_ipv6(struct sk_buff *skb, const struct net_device *dev, | |
4cd91f7c PNA |
525 | struct flow_offload_tuple *tuple, u32 *hdrsize, |
526 | u32 offset) | |
a908fdec FF |
527 | { |
528 | struct flow_ports *ports; | |
529 | struct ipv6hdr *ip6h; | |
2fc11745 | 530 | unsigned int thoff; |
a908fdec | 531 | |
4cd91f7c PNA |
532 | thoff = sizeof(*ip6h) + offset; |
533 | if (!pskb_may_pull(skb, thoff)) | |
a908fdec FF |
534 | return -1; |
535 | ||
4cd91f7c | 536 | ip6h = (struct ipv6hdr *)(skb_network_header(skb) + offset); |
a908fdec | 537 | |
793d5d61 PNA |
538 | switch (ip6h->nexthdr) { |
539 | case IPPROTO_TCP: | |
2fc11745 | 540 | *hdrsize = sizeof(struct tcphdr); |
793d5d61 PNA |
541 | break; |
542 | case IPPROTO_UDP: | |
2fc11745 | 543 | *hdrsize = sizeof(struct udphdr); |
793d5d61 PNA |
544 | break; |
545 | default: | |
a908fdec | 546 | return -1; |
793d5d61 | 547 | } |
a908fdec | 548 | |
33cc3c0c TY |
549 | if (ip6h->hop_limit <= 1) |
550 | return -1; | |
551 | ||
2fc11745 | 552 | if (!pskb_may_pull(skb, thoff + *hdrsize)) |
a908fdec FF |
553 | return -1; |
554 | ||
4cd91f7c | 555 | ip6h = (struct ipv6hdr *)(skb_network_header(skb) + offset); |
a908fdec FF |
556 | ports = (struct flow_ports *)(skb_network_header(skb) + thoff); |
557 | ||
558 | tuple->src_v6 = ip6h->saddr; | |
559 | tuple->dst_v6 = ip6h->daddr; | |
560 | tuple->src_port = ports->source; | |
561 | tuple->dst_port = ports->dest; | |
562 | tuple->l3proto = AF_INET6; | |
563 | tuple->l4proto = ip6h->nexthdr; | |
564 | tuple->iifidx = dev->ifindex; | |
4cd91f7c | 565 | nf_flow_tuple_encap(skb, tuple); |
a908fdec FF |
566 | |
567 | return 0; | |
568 | } | |
569 | ||
570 | unsigned int | |
571 | nf_flow_offload_ipv6_hook(void *priv, struct sk_buff *skb, | |
572 | const struct nf_hook_state *state) | |
573 | { | |
574 | struct flow_offload_tuple_rhash *tuplehash; | |
575 | struct nf_flowtable *flow_table = priv; | |
576 | struct flow_offload_tuple tuple = {}; | |
577 | enum flow_offload_tuple_dir dir; | |
9b1c1ef1 | 578 | const struct in6_addr *nexthop; |
a908fdec FF |
579 | struct flow_offload *flow; |
580 | struct net_device *outdev; | |
4cd91f7c PNA |
581 | unsigned int thoff, mtu; |
582 | u32 hdrsize, offset = 0; | |
a908fdec FF |
583 | struct ipv6hdr *ip6h; |
584 | struct rt6_info *rt; | |
7a27f6ab | 585 | int ret; |
a908fdec | 586 | |
4cd91f7c PNA |
587 | if (skb->protocol != htons(ETH_P_IPV6) && |
588 | !nf_flow_skb_encap_protocol(skb, htons(ETH_P_IPV6), &offset)) | |
a908fdec FF |
589 | return NF_ACCEPT; |
590 | ||
4cd91f7c | 591 | if (nf_flow_tuple_ipv6(skb, state->in, &tuple, &hdrsize, offset) < 0) |
a908fdec FF |
592 | return NF_ACCEPT; |
593 | ||
594 | tuplehash = flow_offload_lookup(flow_table, &tuple); | |
595 | if (tuplehash == NULL) | |
596 | return NF_ACCEPT; | |
597 | ||
a908fdec FF |
598 | dir = tuplehash->tuple.dir; |
599 | flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]); | |
a908fdec | 600 | |
4cd91f7c PNA |
601 | mtu = flow->tuplehash[dir].tuple.mtu + offset; |
602 | if (unlikely(nf_flow_exceeds_mtu(skb, mtu))) | |
a908fdec FF |
603 | return NF_ACCEPT; |
604 | ||
4cd91f7c PNA |
605 | ip6h = (struct ipv6hdr *)(skb_network_header(skb) + offset); |
606 | thoff = sizeof(*ip6h) + offset; | |
607 | if (nf_flow_state_check(flow, ip6h->nexthdr, skb, thoff)) | |
b6f27d32 FF |
608 | return NF_ACCEPT; |
609 | ||
7a27f6ab PNA |
610 | if (tuplehash->tuple.xmit_type == FLOW_OFFLOAD_XMIT_NEIGH || |
611 | tuplehash->tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM) { | |
612 | rt = (struct rt6_info *)tuplehash->tuple.dst_cache; | |
613 | if (!dst_check(&rt->dst, 0)) { | |
614 | flow_offload_teardown(flow); | |
615 | return NF_ACCEPT; | |
616 | } | |
589b474a FW |
617 | } |
618 | ||
4cd91f7c | 619 | if (skb_try_make_writable(skb, thoff + hdrsize)) |
a908fdec FF |
620 | return NF_DROP; |
621 | ||
1b9cd769 PNA |
622 | flow_offload_refresh(flow_table, flow); |
623 | ||
4cd91f7c PNA |
624 | nf_flow_encap_pop(skb, tuplehash); |
625 | ||
2fc11745 | 626 | ip6h = ipv6_hdr(skb); |
f4401262 | 627 | nf_flow_nat_ipv6(flow, skb, dir, ip6h); |
a908fdec | 628 | |
a908fdec | 629 | ip6h->hop_limit--; |
de20900f | 630 | skb->tstamp = 0; |
a908fdec | 631 | |
53c2b289 PNA |
632 | if (flow_table->flags & NF_FLOWTABLE_COUNTER) |
633 | nf_ct_acct_update(flow->ct, tuplehash->tuple.dir, skb->len); | |
634 | ||
5139c0c0 | 635 | if (unlikely(tuplehash->tuple.xmit_type == FLOW_OFFLOAD_XMIT_XFRM)) { |
589b474a FW |
636 | memset(skb->cb, 0, sizeof(struct inet6_skb_parm)); |
637 | IP6CB(skb)->iif = skb->dev->ifindex; | |
638 | IP6CB(skb)->flags = IP6SKB_FORWARDED; | |
639 | return nf_flow_xmit_xfrm(skb, state, &rt->dst); | |
640 | } | |
641 | ||
7a27f6ab PNA |
642 | switch (tuplehash->tuple.xmit_type) { |
643 | case FLOW_OFFLOAD_XMIT_NEIGH: | |
644 | outdev = rt->dst.dev; | |
645 | skb->dev = outdev; | |
646 | nexthop = rt6_nexthop(rt, &flow->tuplehash[!dir].tuple.src_v6); | |
647 | skb_dst_set_noref(skb, &rt->dst); | |
648 | neigh_xmit(NEIGH_ND_TABLE, outdev, nexthop, skb); | |
649 | ret = NF_STOLEN; | |
650 | break; | |
651 | case FLOW_OFFLOAD_XMIT_DIRECT: | |
652 | ret = nf_flow_queue_xmit(state->net, skb, tuplehash, ETH_P_IPV6); | |
653 | if (ret == NF_DROP) | |
654 | flow_offload_teardown(flow); | |
655 | break; | |
656 | } | |
a908fdec | 657 | |
7a27f6ab | 658 | return ret; |
a908fdec FF |
659 | } |
660 | EXPORT_SYMBOL_GPL(nf_flow_offload_ipv6_hook); |