Commit | Line | Data |
---|---|---|
d2912cb1 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
96518518 | 2 | /* |
ef1f7df9 | 3 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
18140969 | 4 | * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org> |
96518518 | 5 | * |
96518518 PM |
6 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
7 | */ | |
8 | ||
9 | #include <linux/kernel.h> | |
8cfd23e6 | 10 | #include <linux/if_vlan.h> |
96518518 PM |
11 | #include <linux/init.h> |
12 | #include <linux/module.h> | |
13 | #include <linux/netlink.h> | |
14 | #include <linux/netfilter.h> | |
15 | #include <linux/netfilter/nf_tables.h> | |
16 | #include <net/netfilter/nf_tables_core.h> | |
17 | #include <net/netfilter/nf_tables.h> | |
c9626a2c | 18 | #include <net/netfilter/nf_tables_offload.h> |
18140969 PNA |
19 | /* For layer 4 checksum field offset. */ |
20 | #include <linux/tcp.h> | |
21 | #include <linux/udp.h> | |
c247897d | 22 | #include <net/gre.h> |
18140969 | 23 | #include <linux/icmpv6.h> |
c9626a2c PNA |
24 | #include <linux/ip.h> |
25 | #include <linux/ipv6.h> | |
346e320c | 26 | #include <net/sctp/checksum.h> |
96518518 | 27 | |
8dfd8b09 PNA |
28 | static bool nft_payload_rebuild_vlan_hdr(const struct sk_buff *skb, int mac_off, |
29 | struct vlan_ethhdr *veth) | |
30 | { | |
31 | if (skb_copy_bits(skb, mac_off, veth, ETH_HLEN)) | |
32 | return false; | |
33 | ||
34 | veth->h_vlan_proto = skb->vlan_proto; | |
35 | veth->h_vlan_TCI = htons(skb_vlan_tag_get(skb)); | |
36 | veth->h_vlan_encapsulated_proto = skb->protocol; | |
37 | ||
38 | return true; | |
39 | } | |
40 | ||
8cfd23e6 FW |
41 | /* add vlan header into the user buffer for if tag was removed by offloads */ |
42 | static bool | |
43 | nft_payload_copy_vlan(u32 *d, const struct sk_buff *skb, u8 offset, u8 len) | |
44 | { | |
45 | int mac_off = skb_mac_header(skb) - skb->data; | |
f41f72d0 | 46 | u8 *vlanh, *dst_u8 = (u8 *) d; |
8cfd23e6 | 47 | struct vlan_ethhdr veth; |
f6ae9f12 PNA |
48 | u8 vlan_hlen = 0; |
49 | ||
50 | if ((skb->protocol == htons(ETH_P_8021AD) || | |
51 | skb->protocol == htons(ETH_P_8021Q)) && | |
52 | offset >= VLAN_ETH_HLEN && offset < VLAN_ETH_HLEN + VLAN_HLEN) | |
53 | vlan_hlen += VLAN_HLEN; | |
8cfd23e6 FW |
54 | |
55 | vlanh = (u8 *) &veth; | |
f6ae9f12 | 56 | if (offset < VLAN_ETH_HLEN + vlan_hlen) { |
f41f72d0 | 57 | u8 ethlen = len; |
8cfd23e6 | 58 | |
f6ae9f12 PNA |
59 | if (vlan_hlen && |
60 | skb_copy_bits(skb, mac_off, &veth, VLAN_ETH_HLEN) < 0) | |
61 | return false; | |
62 | else if (!nft_payload_rebuild_vlan_hdr(skb, mac_off, &veth)) | |
8cfd23e6 FW |
63 | return false; |
64 | ||
f6ae9f12 | 65 | if (offset + len > VLAN_ETH_HLEN + vlan_hlen) |
696e1a48 | 66 | ethlen -= offset + len - VLAN_ETH_HLEN - vlan_hlen; |
8cfd23e6 | 67 | |
f6ae9f12 | 68 | memcpy(dst_u8, vlanh + offset - vlan_hlen, ethlen); |
8cfd23e6 FW |
69 | |
70 | len -= ethlen; | |
71 | if (len == 0) | |
72 | return true; | |
73 | ||
74 | dst_u8 += ethlen; | |
f6ae9f12 | 75 | offset = ETH_HLEN + vlan_hlen; |
f41f72d0 | 76 | } else { |
f6ae9f12 | 77 | offset -= VLAN_HLEN + vlan_hlen; |
8cfd23e6 FW |
78 | } |
79 | ||
8cfd23e6 FW |
80 | return skb_copy_bits(skb, offset + mac_off, dst_u8, len) == 0; |
81 | } | |
82 | ||
c46b38dc PNA |
83 | static int __nft_payload_inner_offset(struct nft_pktinfo *pkt) |
84 | { | |
85 | unsigned int thoff = nft_thoff(pkt); | |
86 | ||
a9e8503d | 87 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
c46b38dc PNA |
88 | return -1; |
89 | ||
90 | switch (pkt->tprot) { | |
91 | case IPPROTO_UDP: | |
92 | pkt->inneroff = thoff + sizeof(struct udphdr); | |
93 | break; | |
94 | case IPPROTO_TCP: { | |
95 | struct tcphdr *th, _tcph; | |
96 | ||
97 | th = skb_header_pointer(pkt->skb, thoff, sizeof(_tcph), &_tcph); | |
98 | if (!th) | |
99 | return -1; | |
100 | ||
101 | pkt->inneroff = thoff + __tcp_hdrlen(th); | |
102 | } | |
103 | break; | |
c247897d | 104 | case IPPROTO_GRE: { |
66394126 | 105 | u32 offset = sizeof(struct gre_base_hdr); |
c247897d | 106 | struct gre_base_hdr *gre, _gre; |
66394126 | 107 | __be16 version; |
c247897d PNA |
108 | |
109 | gre = skb_header_pointer(pkt->skb, thoff, sizeof(_gre), &_gre); | |
110 | if (!gre) | |
111 | return -1; | |
112 | ||
113 | version = gre->flags & GRE_VERSION; | |
114 | switch (version) { | |
115 | case GRE_VERSION_0: | |
116 | if (gre->flags & GRE_ROUTING) | |
117 | return -1; | |
118 | ||
119 | if (gre->flags & GRE_CSUM) { | |
120 | offset += sizeof_field(struct gre_full_hdr, csum) + | |
121 | sizeof_field(struct gre_full_hdr, reserved1); | |
122 | } | |
123 | if (gre->flags & GRE_KEY) | |
124 | offset += sizeof_field(struct gre_full_hdr, key); | |
125 | ||
126 | if (gre->flags & GRE_SEQ) | |
127 | offset += sizeof_field(struct gre_full_hdr, seq); | |
128 | break; | |
129 | default: | |
130 | return -1; | |
131 | } | |
132 | ||
133 | pkt->inneroff = thoff + offset; | |
134 | } | |
135 | break; | |
3927ce88 PNA |
136 | case IPPROTO_IPIP: |
137 | pkt->inneroff = thoff; | |
138 | break; | |
c46b38dc PNA |
139 | default: |
140 | return -1; | |
141 | } | |
142 | ||
143 | pkt->flags |= NFT_PKTINFO_INNER; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
3a07327d | 148 | int nft_payload_inner_offset(const struct nft_pktinfo *pkt) |
c46b38dc PNA |
149 | { |
150 | if (!(pkt->flags & NFT_PKTINFO_INNER) && | |
151 | __nft_payload_inner_offset((struct nft_pktinfo *)pkt) < 0) | |
152 | return -1; | |
153 | ||
154 | return pkt->inneroff; | |
155 | } | |
156 | ||
10870dd8 FW |
157 | void nft_payload_eval(const struct nft_expr *expr, |
158 | struct nft_regs *regs, | |
159 | const struct nft_pktinfo *pkt) | |
96518518 PM |
160 | { |
161 | const struct nft_payload *priv = nft_expr_priv(expr); | |
162 | const struct sk_buff *skb = pkt->skb; | |
49499c3e | 163 | u32 *dest = ®s->data[priv->dreg]; |
96518518 PM |
164 | int offset; |
165 | ||
1e105e6a FW |
166 | if (priv->len % NFT_REG32_SIZE) |
167 | dest[priv->len / NFT_REG32_SIZE] = 0; | |
168 | ||
96518518 PM |
169 | switch (priv->base) { |
170 | case NFT_PAYLOAD_LL_HEADER: | |
171 | if (!skb_mac_header_was_set(skb)) | |
172 | goto err; | |
8cfd23e6 FW |
173 | |
174 | if (skb_vlan_tag_present(skb)) { | |
175 | if (!nft_payload_copy_vlan(dest, skb, | |
176 | priv->offset, priv->len)) | |
177 | goto err; | |
178 | return; | |
179 | } | |
96518518 PM |
180 | offset = skb_mac_header(skb) - skb->data; |
181 | break; | |
182 | case NFT_PAYLOAD_NETWORK_HEADER: | |
183 | offset = skb_network_offset(skb); | |
184 | break; | |
185 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
a9e8503d | 186 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
a20877b5 | 187 | goto err; |
2d7b4ace | 188 | offset = nft_thoff(pkt); |
96518518 | 189 | break; |
c46b38dc PNA |
190 | case NFT_PAYLOAD_INNER_HEADER: |
191 | offset = nft_payload_inner_offset(pkt); | |
192 | if (offset < 0) | |
193 | goto err; | |
194 | break; | |
96518518 | 195 | default: |
8801d791 PNA |
196 | WARN_ON_ONCE(1); |
197 | goto err; | |
96518518 PM |
198 | } |
199 | offset += priv->offset; | |
200 | ||
fad136ea | 201 | if (skb_copy_bits(skb, offset, dest, priv->len) < 0) |
96518518 PM |
202 | goto err; |
203 | return; | |
204 | err: | |
a55e22e9 | 205 | regs->verdict.code = NFT_BREAK; |
96518518 PM |
206 | } |
207 | ||
208 | static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = { | |
7ec3f7b4 PM |
209 | [NFTA_PAYLOAD_SREG] = { .type = NLA_U32 }, |
210 | [NFTA_PAYLOAD_DREG] = { .type = NLA_U32 }, | |
211 | [NFTA_PAYLOAD_BASE] = { .type = NLA_U32 }, | |
ecaf75ff FW |
212 | [NFTA_PAYLOAD_OFFSET] = NLA_POLICY_MAX(NLA_BE32, 255), |
213 | [NFTA_PAYLOAD_LEN] = NLA_POLICY_MAX(NLA_BE32, 255), | |
7ec3f7b4 | 214 | [NFTA_PAYLOAD_CSUM_TYPE] = { .type = NLA_U32 }, |
ecaf75ff | 215 | [NFTA_PAYLOAD_CSUM_OFFSET] = NLA_POLICY_MAX(NLA_BE32, 255), |
9d6effb2 | 216 | [NFTA_PAYLOAD_CSUM_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
217 | }; |
218 | ||
219 | static int nft_payload_init(const struct nft_ctx *ctx, | |
220 | const struct nft_expr *expr, | |
221 | const struct nlattr * const tb[]) | |
222 | { | |
223 | struct nft_payload *priv = nft_expr_priv(expr); | |
96518518 | 224 | |
c29b72e0 | 225 | priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); |
96518518 PM |
226 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); |
227 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); | |
96518518 | 228 | |
345023b0 PNA |
229 | return nft_parse_register_store(ctx, tb[NFTA_PAYLOAD_DREG], |
230 | &priv->dreg, NULL, NFT_DATA_VALUE, | |
231 | priv->len); | |
96518518 PM |
232 | } |
233 | ||
7d34aa3e PS |
234 | static int nft_payload_dump(struct sk_buff *skb, |
235 | const struct nft_expr *expr, bool reset) | |
96518518 PM |
236 | { |
237 | const struct nft_payload *priv = nft_expr_priv(expr); | |
238 | ||
b1c96ed3 | 239 | if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) || |
96518518 PM |
240 | nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || |
241 | nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || | |
242 | nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len))) | |
243 | goto nla_put_failure; | |
244 | return 0; | |
245 | ||
246 | nla_put_failure: | |
247 | return -1; | |
248 | } | |
249 | ||
a7c176bf PNA |
250 | static bool nft_payload_reduce(struct nft_regs_track *track, |
251 | const struct nft_expr *expr) | |
252 | { | |
253 | const struct nft_payload *priv = nft_expr_priv(expr); | |
254 | const struct nft_payload *payload; | |
255 | ||
34cc9e52 PNA |
256 | if (!nft_reg_track_cmp(track, expr, priv->dreg)) { |
257 | nft_reg_track_update(track, expr, priv->dreg, priv->len); | |
a7c176bf PNA |
258 | return false; |
259 | } | |
260 | ||
261 | payload = nft_expr_priv(track->regs[priv->dreg].selector); | |
262 | if (priv->base != payload->base || | |
263 | priv->offset != payload->offset || | |
264 | priv->len != payload->len) { | |
34cc9e52 | 265 | nft_reg_track_update(track, expr, priv->dreg, priv->len); |
a7c176bf PNA |
266 | return false; |
267 | } | |
268 | ||
269 | if (!track->regs[priv->dreg].bitwise) | |
270 | return true; | |
271 | ||
be5650f8 | 272 | return nft_expr_reduce_bitwise(track, expr); |
a7c176bf PNA |
273 | } |
274 | ||
a5d45bc0 PNA |
275 | static bool nft_payload_offload_mask(struct nft_offload_reg *reg, |
276 | u32 priv_len, u32 field_len) | |
277 | { | |
278 | unsigned int remainder, delta, k; | |
279 | struct nft_data mask = {}; | |
280 | __be32 remainder_mask; | |
281 | ||
282 | if (priv_len == field_len) { | |
283 | memset(®->mask, 0xff, priv_len); | |
284 | return true; | |
285 | } else if (priv_len > field_len) { | |
286 | return false; | |
287 | } | |
288 | ||
289 | memset(&mask, 0xff, field_len); | |
290 | remainder = priv_len % sizeof(u32); | |
291 | if (remainder) { | |
292 | k = priv_len / sizeof(u32); | |
293 | delta = field_len - priv_len; | |
294 | remainder_mask = htonl(~((1 << (delta * BITS_PER_BYTE)) - 1)); | |
295 | mask.data[k] = (__force u32)remainder_mask; | |
296 | } | |
297 | ||
298 | memcpy(®->mask, &mask, field_len); | |
299 | ||
300 | return true; | |
301 | } | |
302 | ||
c9626a2c PNA |
303 | static int nft_payload_offload_ll(struct nft_offload_ctx *ctx, |
304 | struct nft_flow_rule *flow, | |
305 | const struct nft_payload *priv) | |
306 | { | |
307 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
308 | ||
309 | switch (priv->offset) { | |
310 | case offsetof(struct ethhdr, h_source): | |
a5d45bc0 | 311 | if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN)) |
a69a85da | 312 | return -EOPNOTSUPP; |
313 | ||
c9626a2c PNA |
314 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs, |
315 | src, ETH_ALEN, reg); | |
316 | break; | |
317 | case offsetof(struct ethhdr, h_dest): | |
a5d45bc0 | 318 | if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN)) |
a69a85da | 319 | return -EOPNOTSUPP; |
320 | ||
c9626a2c PNA |
321 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs, |
322 | dst, ETH_ALEN, reg); | |
323 | break; | |
a82055af | 324 | case offsetof(struct ethhdr, h_proto): |
a5d45bc0 | 325 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a82055af PNA |
326 | return -EOPNOTSUPP; |
327 | ||
328 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, | |
329 | n_proto, sizeof(__be16), reg); | |
330 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); | |
331 | break; | |
332 | case offsetof(struct vlan_ethhdr, h_vlan_TCI): | |
a5d45bc0 | 333 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a82055af PNA |
334 | return -EOPNOTSUPP; |
335 | ||
ff4d90a8 PNA |
336 | NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_VLAN, vlan, |
337 | vlan_tci, sizeof(__be16), reg, | |
338 | NFT_OFFLOAD_F_NETWORK2HOST); | |
a82055af PNA |
339 | break; |
340 | case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto): | |
a5d45bc0 | 341 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a82055af PNA |
342 | return -EOPNOTSUPP; |
343 | ||
344 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan, | |
345 | vlan_tpid, sizeof(__be16), reg); | |
89d8fd44 PNA |
346 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
347 | break; | |
348 | case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr): | |
a5d45bc0 | 349 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
89d8fd44 PNA |
350 | return -EOPNOTSUPP; |
351 | ||
ff4d90a8 PNA |
352 | NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_CVLAN, cvlan, |
353 | vlan_tci, sizeof(__be16), reg, | |
354 | NFT_OFFLOAD_F_NETWORK2HOST); | |
89d8fd44 PNA |
355 | break; |
356 | case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto) + | |
357 | sizeof(struct vlan_hdr): | |
a5d45bc0 | 358 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
89d8fd44 PNA |
359 | return -EOPNOTSUPP; |
360 | ||
14c20643 | 361 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, cvlan, |
89d8fd44 | 362 | vlan_tpid, sizeof(__be16), reg); |
14c20643 | 363 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
a82055af | 364 | break; |
a69a85da | 365 | default: |
366 | return -EOPNOTSUPP; | |
c9626a2c PNA |
367 | } |
368 | ||
369 | return 0; | |
370 | } | |
371 | ||
372 | static int nft_payload_offload_ip(struct nft_offload_ctx *ctx, | |
373 | struct nft_flow_rule *flow, | |
374 | const struct nft_payload *priv) | |
375 | { | |
376 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
377 | ||
378 | switch (priv->offset) { | |
379 | case offsetof(struct iphdr, saddr): | |
a5d45bc0 PNA |
380 | if (!nft_payload_offload_mask(reg, priv->len, |
381 | sizeof(struct in_addr))) | |
a69a85da | 382 | return -EOPNOTSUPP; |
383 | ||
c9626a2c PNA |
384 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, src, |
385 | sizeof(struct in_addr), reg); | |
3c78e9e0 | 386 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS); |
c9626a2c PNA |
387 | break; |
388 | case offsetof(struct iphdr, daddr): | |
a5d45bc0 PNA |
389 | if (!nft_payload_offload_mask(reg, priv->len, |
390 | sizeof(struct in_addr))) | |
a69a85da | 391 | return -EOPNOTSUPP; |
392 | ||
c9626a2c PNA |
393 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, dst, |
394 | sizeof(struct in_addr), reg); | |
3c78e9e0 | 395 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS); |
c9626a2c PNA |
396 | break; |
397 | case offsetof(struct iphdr, protocol): | |
a5d45bc0 | 398 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8))) |
a69a85da | 399 | return -EOPNOTSUPP; |
400 | ||
c9626a2c PNA |
401 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, |
402 | sizeof(__u8), reg); | |
403 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); | |
404 | break; | |
405 | default: | |
406 | return -EOPNOTSUPP; | |
407 | } | |
408 | ||
409 | return 0; | |
410 | } | |
411 | ||
412 | static int nft_payload_offload_ip6(struct nft_offload_ctx *ctx, | |
413 | struct nft_flow_rule *flow, | |
414 | const struct nft_payload *priv) | |
415 | { | |
416 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
417 | ||
418 | switch (priv->offset) { | |
419 | case offsetof(struct ipv6hdr, saddr): | |
a5d45bc0 PNA |
420 | if (!nft_payload_offload_mask(reg, priv->len, |
421 | sizeof(struct in6_addr))) | |
a69a85da | 422 | return -EOPNOTSUPP; |
423 | ||
c9626a2c PNA |
424 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, src, |
425 | sizeof(struct in6_addr), reg); | |
3c78e9e0 | 426 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS); |
c9626a2c PNA |
427 | break; |
428 | case offsetof(struct ipv6hdr, daddr): | |
a5d45bc0 PNA |
429 | if (!nft_payload_offload_mask(reg, priv->len, |
430 | sizeof(struct in6_addr))) | |
a69a85da | 431 | return -EOPNOTSUPP; |
432 | ||
c9626a2c PNA |
433 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, dst, |
434 | sizeof(struct in6_addr), reg); | |
3c78e9e0 | 435 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS); |
c9626a2c PNA |
436 | break; |
437 | case offsetof(struct ipv6hdr, nexthdr): | |
a5d45bc0 | 438 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8))) |
a69a85da | 439 | return -EOPNOTSUPP; |
440 | ||
c9626a2c PNA |
441 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, |
442 | sizeof(__u8), reg); | |
443 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); | |
444 | break; | |
445 | default: | |
446 | return -EOPNOTSUPP; | |
447 | } | |
448 | ||
449 | return 0; | |
450 | } | |
451 | ||
452 | static int nft_payload_offload_nh(struct nft_offload_ctx *ctx, | |
453 | struct nft_flow_rule *flow, | |
454 | const struct nft_payload *priv) | |
455 | { | |
456 | int err; | |
457 | ||
458 | switch (ctx->dep.l3num) { | |
459 | case htons(ETH_P_IP): | |
460 | err = nft_payload_offload_ip(ctx, flow, priv); | |
461 | break; | |
462 | case htons(ETH_P_IPV6): | |
463 | err = nft_payload_offload_ip6(ctx, flow, priv); | |
464 | break; | |
465 | default: | |
466 | return -EOPNOTSUPP; | |
467 | } | |
468 | ||
469 | return err; | |
470 | } | |
471 | ||
472 | static int nft_payload_offload_tcp(struct nft_offload_ctx *ctx, | |
473 | struct nft_flow_rule *flow, | |
474 | const struct nft_payload *priv) | |
475 | { | |
476 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
477 | ||
478 | switch (priv->offset) { | |
479 | case offsetof(struct tcphdr, source): | |
a5d45bc0 | 480 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 481 | return -EOPNOTSUPP; |
482 | ||
c9626a2c PNA |
483 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src, |
484 | sizeof(__be16), reg); | |
485 | break; | |
486 | case offsetof(struct tcphdr, dest): | |
a5d45bc0 | 487 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 488 | return -EOPNOTSUPP; |
489 | ||
c9626a2c PNA |
490 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst, |
491 | sizeof(__be16), reg); | |
492 | break; | |
493 | default: | |
494 | return -EOPNOTSUPP; | |
495 | } | |
496 | ||
497 | return 0; | |
498 | } | |
499 | ||
500 | static int nft_payload_offload_udp(struct nft_offload_ctx *ctx, | |
501 | struct nft_flow_rule *flow, | |
502 | const struct nft_payload *priv) | |
503 | { | |
504 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
505 | ||
506 | switch (priv->offset) { | |
507 | case offsetof(struct udphdr, source): | |
a5d45bc0 | 508 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 509 | return -EOPNOTSUPP; |
510 | ||
c9626a2c PNA |
511 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src, |
512 | sizeof(__be16), reg); | |
513 | break; | |
514 | case offsetof(struct udphdr, dest): | |
a5d45bc0 | 515 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 516 | return -EOPNOTSUPP; |
517 | ||
c9626a2c PNA |
518 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst, |
519 | sizeof(__be16), reg); | |
520 | break; | |
521 | default: | |
522 | return -EOPNOTSUPP; | |
523 | } | |
524 | ||
525 | return 0; | |
526 | } | |
527 | ||
528 | static int nft_payload_offload_th(struct nft_offload_ctx *ctx, | |
529 | struct nft_flow_rule *flow, | |
530 | const struct nft_payload *priv) | |
531 | { | |
532 | int err; | |
533 | ||
534 | switch (ctx->dep.protonum) { | |
535 | case IPPROTO_TCP: | |
536 | err = nft_payload_offload_tcp(ctx, flow, priv); | |
537 | break; | |
538 | case IPPROTO_UDP: | |
539 | err = nft_payload_offload_udp(ctx, flow, priv); | |
540 | break; | |
541 | default: | |
542 | return -EOPNOTSUPP; | |
543 | } | |
544 | ||
545 | return err; | |
546 | } | |
547 | ||
548 | static int nft_payload_offload(struct nft_offload_ctx *ctx, | |
549 | struct nft_flow_rule *flow, | |
550 | const struct nft_expr *expr) | |
551 | { | |
552 | const struct nft_payload *priv = nft_expr_priv(expr); | |
553 | int err; | |
554 | ||
555 | switch (priv->base) { | |
556 | case NFT_PAYLOAD_LL_HEADER: | |
557 | err = nft_payload_offload_ll(ctx, flow, priv); | |
558 | break; | |
559 | case NFT_PAYLOAD_NETWORK_HEADER: | |
560 | err = nft_payload_offload_nh(ctx, flow, priv); | |
561 | break; | |
562 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
563 | err = nft_payload_offload_th(ctx, flow, priv); | |
564 | break; | |
565 | default: | |
566 | err = -EOPNOTSUPP; | |
567 | break; | |
568 | } | |
569 | return err; | |
570 | } | |
571 | ||
ef1f7df9 PM |
572 | static const struct nft_expr_ops nft_payload_ops = { |
573 | .type = &nft_payload_type, | |
96518518 | 574 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), |
96518518 PM |
575 | .eval = nft_payload_eval, |
576 | .init = nft_payload_init, | |
577 | .dump = nft_payload_dump, | |
a7c176bf | 578 | .reduce = nft_payload_reduce, |
c9626a2c | 579 | .offload = nft_payload_offload, |
ef1f7df9 PM |
580 | }; |
581 | ||
c29b72e0 PM |
582 | const struct nft_expr_ops nft_payload_fast_ops = { |
583 | .type = &nft_payload_type, | |
584 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), | |
585 | .eval = nft_payload_eval, | |
586 | .init = nft_payload_init, | |
587 | .dump = nft_payload_dump, | |
a7c176bf | 588 | .reduce = nft_payload_reduce, |
c9626a2c | 589 | .offload = nft_payload_offload, |
c29b72e0 PM |
590 | }; |
591 | ||
3a07327d PNA |
592 | void nft_payload_inner_eval(const struct nft_expr *expr, struct nft_regs *regs, |
593 | const struct nft_pktinfo *pkt, | |
594 | struct nft_inner_tun_ctx *tun_ctx) | |
595 | { | |
596 | const struct nft_payload *priv = nft_expr_priv(expr); | |
597 | const struct sk_buff *skb = pkt->skb; | |
598 | u32 *dest = ®s->data[priv->dreg]; | |
599 | int offset; | |
600 | ||
601 | if (priv->len % NFT_REG32_SIZE) | |
602 | dest[priv->len / NFT_REG32_SIZE] = 0; | |
603 | ||
604 | switch (priv->base) { | |
605 | case NFT_PAYLOAD_TUN_HEADER: | |
606 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_TUN)) | |
607 | goto err; | |
608 | ||
609 | offset = tun_ctx->inner_tunoff; | |
610 | break; | |
611 | case NFT_PAYLOAD_LL_HEADER: | |
612 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_LL)) | |
613 | goto err; | |
614 | ||
615 | offset = tun_ctx->inner_lloff; | |
616 | break; | |
617 | case NFT_PAYLOAD_NETWORK_HEADER: | |
618 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_NH)) | |
619 | goto err; | |
620 | ||
621 | offset = tun_ctx->inner_nhoff; | |
622 | break; | |
623 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
624 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_TH)) | |
625 | goto err; | |
626 | ||
627 | offset = tun_ctx->inner_thoff; | |
628 | break; | |
629 | default: | |
630 | WARN_ON_ONCE(1); | |
631 | goto err; | |
632 | } | |
633 | offset += priv->offset; | |
634 | ||
635 | if (skb_copy_bits(skb, offset, dest, priv->len) < 0) | |
636 | goto err; | |
637 | ||
638 | return; | |
639 | err: | |
640 | regs->verdict.code = NFT_BREAK; | |
641 | } | |
642 | ||
643 | static int nft_payload_inner_init(const struct nft_ctx *ctx, | |
644 | const struct nft_expr *expr, | |
645 | const struct nlattr * const tb[]) | |
646 | { | |
647 | struct nft_payload *priv = nft_expr_priv(expr); | |
648 | u32 base; | |
649 | ||
650 | base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); | |
651 | switch (base) { | |
652 | case NFT_PAYLOAD_TUN_HEADER: | |
653 | case NFT_PAYLOAD_LL_HEADER: | |
654 | case NFT_PAYLOAD_NETWORK_HEADER: | |
655 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
656 | break; | |
657 | default: | |
658 | return -EOPNOTSUPP; | |
659 | } | |
660 | ||
661 | priv->base = base; | |
662 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); | |
663 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); | |
664 | ||
665 | return nft_parse_register_store(ctx, tb[NFTA_PAYLOAD_DREG], | |
666 | &priv->dreg, NULL, NFT_DATA_VALUE, | |
667 | priv->len); | |
668 | } | |
669 | ||
670 | static const struct nft_expr_ops nft_payload_inner_ops = { | |
671 | .type = &nft_payload_type, | |
672 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), | |
673 | .init = nft_payload_inner_init, | |
674 | .dump = nft_payload_dump, | |
675 | /* direct call to nft_payload_inner_eval(). */ | |
676 | }; | |
677 | ||
18140969 PNA |
678 | static inline void nft_csum_replace(__sum16 *sum, __wsum fsum, __wsum tsum) |
679 | { | |
680 | *sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), fsum), tsum)); | |
681 | if (*sum == 0) | |
682 | *sum = CSUM_MANGLED_0; | |
683 | } | |
684 | ||
685 | static bool nft_payload_udp_checksum(struct sk_buff *skb, unsigned int thoff) | |
686 | { | |
687 | struct udphdr *uh, _uh; | |
688 | ||
689 | uh = skb_header_pointer(skb, thoff, sizeof(_uh), &_uh); | |
690 | if (!uh) | |
691 | return false; | |
692 | ||
5fd02ebe | 693 | return (__force bool)uh->check; |
18140969 PNA |
694 | } |
695 | ||
696 | static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt, | |
697 | struct sk_buff *skb, | |
698 | unsigned int *l4csum_offset) | |
699 | { | |
4e1860a3 PNA |
700 | if (pkt->fragoff) |
701 | return -1; | |
702 | ||
18140969 PNA |
703 | switch (pkt->tprot) { |
704 | case IPPROTO_TCP: | |
705 | *l4csum_offset = offsetof(struct tcphdr, check); | |
706 | break; | |
707 | case IPPROTO_UDP: | |
2d7b4ace | 708 | if (!nft_payload_udp_checksum(skb, nft_thoff(pkt))) |
18140969 | 709 | return -1; |
954d8297 | 710 | fallthrough; |
18140969 PNA |
711 | case IPPROTO_UDPLITE: |
712 | *l4csum_offset = offsetof(struct udphdr, check); | |
713 | break; | |
714 | case IPPROTO_ICMPV6: | |
715 | *l4csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
716 | break; | |
717 | default: | |
718 | return -1; | |
719 | } | |
720 | ||
2d7b4ace | 721 | *l4csum_offset += nft_thoff(pkt); |
18140969 PNA |
722 | return 0; |
723 | } | |
724 | ||
346e320c DC |
725 | static int nft_payload_csum_sctp(struct sk_buff *skb, int offset) |
726 | { | |
727 | struct sctphdr *sh; | |
728 | ||
729 | if (skb_ensure_writable(skb, offset + sizeof(*sh))) | |
730 | return -1; | |
731 | ||
732 | sh = (struct sctphdr *)(skb->data + offset); | |
733 | sh->checksum = sctp_compute_cksum(skb, offset); | |
734 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
735 | return 0; | |
736 | } | |
737 | ||
18140969 PNA |
738 | static int nft_payload_l4csum_update(const struct nft_pktinfo *pkt, |
739 | struct sk_buff *skb, | |
740 | __wsum fsum, __wsum tsum) | |
741 | { | |
742 | int l4csum_offset; | |
743 | __sum16 sum; | |
744 | ||
745 | /* If we cannot determine layer 4 checksum offset or this packet doesn't | |
746 | * require layer 4 checksum recalculation, skip this packet. | |
747 | */ | |
748 | if (nft_payload_l4csum_offset(pkt, skb, &l4csum_offset) < 0) | |
749 | return 0; | |
750 | ||
751 | if (skb_copy_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0) | |
752 | return -1; | |
753 | ||
754 | /* Checksum mangling for an arbitrary amount of bytes, based on | |
755 | * inet_proto_csum_replace*() functions. | |
756 | */ | |
757 | if (skb->ip_summed != CHECKSUM_PARTIAL) { | |
758 | nft_csum_replace(&sum, fsum, tsum); | |
759 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
760 | skb->csum = ~csum_add(csum_sub(~(skb->csum), fsum), | |
761 | tsum); | |
762 | } | |
763 | } else { | |
764 | sum = ~csum_fold(csum_add(csum_sub(csum_unfold(sum), fsum), | |
765 | tsum)); | |
766 | } | |
767 | ||
7418ee4c | 768 | if (skb_ensure_writable(skb, l4csum_offset + sizeof(sum)) || |
18140969 PNA |
769 | skb_store_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0) |
770 | return -1; | |
771 | ||
772 | return 0; | |
773 | } | |
774 | ||
053d20f5 PNA |
775 | static int nft_payload_csum_inet(struct sk_buff *skb, const u32 *src, |
776 | __wsum fsum, __wsum tsum, int csum_offset) | |
777 | { | |
778 | __sum16 sum; | |
779 | ||
780 | if (skb_copy_bits(skb, csum_offset, &sum, sizeof(sum)) < 0) | |
781 | return -1; | |
782 | ||
783 | nft_csum_replace(&sum, fsum, tsum); | |
7418ee4c | 784 | if (skb_ensure_writable(skb, csum_offset + sizeof(sum)) || |
053d20f5 PNA |
785 | skb_store_bits(skb, csum_offset, &sum, sizeof(sum)) < 0) |
786 | return -1; | |
787 | ||
788 | return 0; | |
789 | } | |
790 | ||
ac1f8c04 PNA |
791 | struct nft_payload_set { |
792 | enum nft_payload_bases base:8; | |
793 | u8 offset; | |
794 | u8 len; | |
795 | u8 sreg; | |
796 | u8 csum_type; | |
797 | u8 csum_offset; | |
798 | u8 csum_flags; | |
799 | }; | |
800 | ||
7ec3f7b4 PM |
801 | static void nft_payload_set_eval(const struct nft_expr *expr, |
802 | struct nft_regs *regs, | |
803 | const struct nft_pktinfo *pkt) | |
804 | { | |
805 | const struct nft_payload_set *priv = nft_expr_priv(expr); | |
806 | struct sk_buff *skb = pkt->skb; | |
807 | const u32 *src = ®s->data[priv->sreg]; | |
808 | int offset, csum_offset; | |
809 | __wsum fsum, tsum; | |
7ec3f7b4 PM |
810 | |
811 | switch (priv->base) { | |
812 | case NFT_PAYLOAD_LL_HEADER: | |
813 | if (!skb_mac_header_was_set(skb)) | |
814 | goto err; | |
815 | offset = skb_mac_header(skb) - skb->data; | |
816 | break; | |
817 | case NFT_PAYLOAD_NETWORK_HEADER: | |
818 | offset = skb_network_offset(skb); | |
819 | break; | |
820 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
a9e8503d | 821 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
a20877b5 | 822 | goto err; |
2d7b4ace | 823 | offset = nft_thoff(pkt); |
7ec3f7b4 | 824 | break; |
c46b38dc PNA |
825 | case NFT_PAYLOAD_INNER_HEADER: |
826 | offset = nft_payload_inner_offset(pkt); | |
827 | if (offset < 0) | |
828 | goto err; | |
829 | break; | |
7ec3f7b4 | 830 | default: |
8801d791 PNA |
831 | WARN_ON_ONCE(1); |
832 | goto err; | |
7ec3f7b4 PM |
833 | } |
834 | ||
835 | csum_offset = offset + priv->csum_offset; | |
836 | offset += priv->offset; | |
837 | ||
053d20f5 | 838 | if ((priv->csum_type == NFT_PAYLOAD_CSUM_INET || priv->csum_flags) && |
c46b38dc PNA |
839 | ((priv->base != NFT_PAYLOAD_TRANSPORT_HEADER && |
840 | priv->base != NFT_PAYLOAD_INNER_HEADER) || | |
7ec3f7b4 | 841 | skb->ip_summed != CHECKSUM_PARTIAL)) { |
7ec3f7b4 PM |
842 | fsum = skb_checksum(skb, offset, priv->len, 0); |
843 | tsum = csum_partial(src, priv->len, 0); | |
7ec3f7b4 | 844 | |
053d20f5 PNA |
845 | if (priv->csum_type == NFT_PAYLOAD_CSUM_INET && |
846 | nft_payload_csum_inet(skb, src, fsum, tsum, csum_offset)) | |
7ec3f7b4 | 847 | goto err; |
18140969 PNA |
848 | |
849 | if (priv->csum_flags && | |
850 | nft_payload_l4csum_update(pkt, skb, fsum, tsum) < 0) | |
851 | goto err; | |
7ec3f7b4 PM |
852 | } |
853 | ||
7418ee4c | 854 | if (skb_ensure_writable(skb, max(offset + priv->len, 0)) || |
7ec3f7b4 PM |
855 | skb_store_bits(skb, offset, src, priv->len) < 0) |
856 | goto err; | |
857 | ||
346e320c DC |
858 | if (priv->csum_type == NFT_PAYLOAD_CSUM_SCTP && |
859 | pkt->tprot == IPPROTO_SCTP && | |
860 | skb->ip_summed != CHECKSUM_PARTIAL) { | |
a9e8503d FW |
861 | if (pkt->fragoff == 0 && |
862 | nft_payload_csum_sctp(skb, nft_thoff(pkt))) | |
346e320c DC |
863 | goto err; |
864 | } | |
865 | ||
7ec3f7b4 PM |
866 | return; |
867 | err: | |
868 | regs->verdict.code = NFT_BREAK; | |
869 | } | |
870 | ||
871 | static int nft_payload_set_init(const struct nft_ctx *ctx, | |
872 | const struct nft_expr *expr, | |
873 | const struct nlattr * const tb[]) | |
874 | { | |
875 | struct nft_payload_set *priv = nft_expr_priv(expr); | |
7044ab28 PNA |
876 | u32 csum_offset, csum_type = NFT_PAYLOAD_CSUM_NONE; |
877 | int err; | |
7ec3f7b4 PM |
878 | |
879 | priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); | |
880 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); | |
881 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); | |
7ec3f7b4 PM |
882 | |
883 | if (tb[NFTA_PAYLOAD_CSUM_TYPE]) | |
7044ab28 PNA |
884 | csum_type = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_TYPE])); |
885 | if (tb[NFTA_PAYLOAD_CSUM_OFFSET]) { | |
886 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_CSUM_OFFSET], U8_MAX, | |
887 | &csum_offset); | |
888 | if (err < 0) | |
889 | return err; | |
890 | ||
891 | priv->csum_offset = csum_offset; | |
892 | } | |
18140969 PNA |
893 | if (tb[NFTA_PAYLOAD_CSUM_FLAGS]) { |
894 | u32 flags; | |
895 | ||
896 | flags = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_FLAGS])); | |
897 | if (flags & ~NFT_PAYLOAD_L4CSUM_PSEUDOHDR) | |
898 | return -EINVAL; | |
899 | ||
900 | priv->csum_flags = flags; | |
901 | } | |
7ec3f7b4 | 902 | |
7044ab28 | 903 | switch (csum_type) { |
7ec3f7b4 PM |
904 | case NFT_PAYLOAD_CSUM_NONE: |
905 | case NFT_PAYLOAD_CSUM_INET: | |
906 | break; | |
346e320c DC |
907 | case NFT_PAYLOAD_CSUM_SCTP: |
908 | if (priv->base != NFT_PAYLOAD_TRANSPORT_HEADER) | |
909 | return -EINVAL; | |
910 | ||
911 | if (priv->csum_offset != offsetof(struct sctphdr, checksum)) | |
912 | return -EINVAL; | |
913 | break; | |
7ec3f7b4 PM |
914 | default: |
915 | return -EOPNOTSUPP; | |
916 | } | |
7044ab28 | 917 | priv->csum_type = csum_type; |
7ec3f7b4 | 918 | |
4f16d25c PNA |
919 | return nft_parse_register_load(tb[NFTA_PAYLOAD_SREG], &priv->sreg, |
920 | priv->len); | |
7ec3f7b4 PM |
921 | } |
922 | ||
7d34aa3e PS |
923 | static int nft_payload_set_dump(struct sk_buff *skb, |
924 | const struct nft_expr *expr, bool reset) | |
7ec3f7b4 PM |
925 | { |
926 | const struct nft_payload_set *priv = nft_expr_priv(expr); | |
927 | ||
928 | if (nft_dump_register(skb, NFTA_PAYLOAD_SREG, priv->sreg) || | |
929 | nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || | |
930 | nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || | |
931 | nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)) || | |
932 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_TYPE, htonl(priv->csum_type)) || | |
933 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_OFFSET, | |
18140969 PNA |
934 | htonl(priv->csum_offset)) || |
935 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_FLAGS, htonl(priv->csum_flags))) | |
7ec3f7b4 PM |
936 | goto nla_put_failure; |
937 | return 0; | |
938 | ||
939 | nla_put_failure: | |
940 | return -1; | |
941 | } | |
942 | ||
cc003c7e PNA |
943 | static bool nft_payload_set_reduce(struct nft_regs_track *track, |
944 | const struct nft_expr *expr) | |
945 | { | |
946 | int i; | |
947 | ||
948 | for (i = 0; i < NFT_REG32_NUM; i++) { | |
949 | if (!track->regs[i].selector) | |
950 | continue; | |
951 | ||
952 | if (track->regs[i].selector->ops != &nft_payload_ops && | |
953 | track->regs[i].selector->ops != &nft_payload_fast_ops) | |
954 | continue; | |
955 | ||
34cc9e52 | 956 | __nft_reg_track_cancel(track, i); |
cc003c7e PNA |
957 | } |
958 | ||
959 | return false; | |
960 | } | |
961 | ||
7ec3f7b4 PM |
962 | static const struct nft_expr_ops nft_payload_set_ops = { |
963 | .type = &nft_payload_type, | |
964 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload_set)), | |
965 | .eval = nft_payload_set_eval, | |
966 | .init = nft_payload_set_init, | |
967 | .dump = nft_payload_set_dump, | |
cc003c7e | 968 | .reduce = nft_payload_set_reduce, |
7ec3f7b4 PM |
969 | }; |
970 | ||
0ca743a5 PNA |
971 | static const struct nft_expr_ops * |
972 | nft_payload_select_ops(const struct nft_ctx *ctx, | |
973 | const struct nlattr * const tb[]) | |
c29b72e0 PM |
974 | { |
975 | enum nft_payload_bases base; | |
976 | unsigned int offset, len; | |
94254f99 | 977 | int err; |
c29b72e0 | 978 | |
7ec3f7b4 | 979 | if (tb[NFTA_PAYLOAD_BASE] == NULL || |
c29b72e0 PM |
980 | tb[NFTA_PAYLOAD_OFFSET] == NULL || |
981 | tb[NFTA_PAYLOAD_LEN] == NULL) | |
982 | return ERR_PTR(-EINVAL); | |
983 | ||
984 | base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); | |
985 | switch (base) { | |
986 | case NFT_PAYLOAD_LL_HEADER: | |
987 | case NFT_PAYLOAD_NETWORK_HEADER: | |
988 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
c46b38dc | 989 | case NFT_PAYLOAD_INNER_HEADER: |
c29b72e0 PM |
990 | break; |
991 | default: | |
992 | return ERR_PTR(-EOPNOTSUPP); | |
993 | } | |
994 | ||
7ec3f7b4 PM |
995 | if (tb[NFTA_PAYLOAD_SREG] != NULL) { |
996 | if (tb[NFTA_PAYLOAD_DREG] != NULL) | |
997 | return ERR_PTR(-EINVAL); | |
998 | return &nft_payload_set_ops; | |
999 | } | |
1000 | ||
1001 | if (tb[NFTA_PAYLOAD_DREG] == NULL) | |
1002 | return ERR_PTR(-EINVAL); | |
1003 | ||
94254f99 PNA |
1004 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_OFFSET], U8_MAX, &offset); |
1005 | if (err < 0) | |
1006 | return ERR_PTR(err); | |
1007 | ||
1008 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_LEN], U8_MAX, &len); | |
1009 | if (err < 0) | |
1010 | return ERR_PTR(err); | |
c29b72e0 | 1011 | |
f627ed91 | 1012 | if (len <= 4 && is_power_of_2(len) && IS_ALIGNED(offset, len) && |
c46b38dc | 1013 | base != NFT_PAYLOAD_LL_HEADER && base != NFT_PAYLOAD_INNER_HEADER) |
c29b72e0 PM |
1014 | return &nft_payload_fast_ops; |
1015 | else | |
1016 | return &nft_payload_ops; | |
1017 | } | |
1018 | ||
4e24877e | 1019 | struct nft_expr_type nft_payload_type __read_mostly = { |
ef1f7df9 | 1020 | .name = "payload", |
c29b72e0 | 1021 | .select_ops = nft_payload_select_ops, |
3a07327d | 1022 | .inner_ops = &nft_payload_inner_ops, |
96518518 PM |
1023 | .policy = nft_payload_policy, |
1024 | .maxattr = NFTA_PAYLOAD_MAX, | |
ef1f7df9 | 1025 | .owner = THIS_MODULE, |
96518518 | 1026 | }; |