Commit | Line | Data |
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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> | |
22 | #include <linux/icmpv6.h> | |
c9626a2c PNA |
23 | #include <linux/ip.h> |
24 | #include <linux/ipv6.h> | |
346e320c | 25 | #include <net/sctp/checksum.h> |
96518518 | 26 | |
8dfd8b09 PNA |
27 | static bool nft_payload_rebuild_vlan_hdr(const struct sk_buff *skb, int mac_off, |
28 | struct vlan_ethhdr *veth) | |
29 | { | |
30 | if (skb_copy_bits(skb, mac_off, veth, ETH_HLEN)) | |
31 | return false; | |
32 | ||
33 | veth->h_vlan_proto = skb->vlan_proto; | |
34 | veth->h_vlan_TCI = htons(skb_vlan_tag_get(skb)); | |
35 | veth->h_vlan_encapsulated_proto = skb->protocol; | |
36 | ||
37 | return true; | |
38 | } | |
39 | ||
8cfd23e6 FW |
40 | /* add vlan header into the user buffer for if tag was removed by offloads */ |
41 | static bool | |
42 | nft_payload_copy_vlan(u32 *d, const struct sk_buff *skb, u8 offset, u8 len) | |
43 | { | |
44 | int mac_off = skb_mac_header(skb) - skb->data; | |
f41f72d0 | 45 | u8 *vlanh, *dst_u8 = (u8 *) d; |
8cfd23e6 | 46 | struct vlan_ethhdr veth; |
f6ae9f12 PNA |
47 | u8 vlan_hlen = 0; |
48 | ||
49 | if ((skb->protocol == htons(ETH_P_8021AD) || | |
50 | skb->protocol == htons(ETH_P_8021Q)) && | |
51 | offset >= VLAN_ETH_HLEN && offset < VLAN_ETH_HLEN + VLAN_HLEN) | |
52 | vlan_hlen += VLAN_HLEN; | |
8cfd23e6 FW |
53 | |
54 | vlanh = (u8 *) &veth; | |
f6ae9f12 | 55 | if (offset < VLAN_ETH_HLEN + vlan_hlen) { |
f41f72d0 | 56 | u8 ethlen = len; |
8cfd23e6 | 57 | |
f6ae9f12 PNA |
58 | if (vlan_hlen && |
59 | skb_copy_bits(skb, mac_off, &veth, VLAN_ETH_HLEN) < 0) | |
60 | return false; | |
61 | else if (!nft_payload_rebuild_vlan_hdr(skb, mac_off, &veth)) | |
8cfd23e6 FW |
62 | return false; |
63 | ||
f6ae9f12 PNA |
64 | if (offset + len > VLAN_ETH_HLEN + vlan_hlen) |
65 | ethlen -= offset + len - VLAN_ETH_HLEN + vlan_hlen; | |
8cfd23e6 | 66 | |
f6ae9f12 | 67 | memcpy(dst_u8, vlanh + offset - vlan_hlen, ethlen); |
8cfd23e6 FW |
68 | |
69 | len -= ethlen; | |
70 | if (len == 0) | |
71 | return true; | |
72 | ||
73 | dst_u8 += ethlen; | |
f6ae9f12 | 74 | offset = ETH_HLEN + vlan_hlen; |
f41f72d0 | 75 | } else { |
f6ae9f12 | 76 | offset -= VLAN_HLEN + vlan_hlen; |
8cfd23e6 FW |
77 | } |
78 | ||
8cfd23e6 FW |
79 | return skb_copy_bits(skb, offset + mac_off, dst_u8, len) == 0; |
80 | } | |
81 | ||
c46b38dc PNA |
82 | static int __nft_payload_inner_offset(struct nft_pktinfo *pkt) |
83 | { | |
84 | unsigned int thoff = nft_thoff(pkt); | |
85 | ||
a9e8503d | 86 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
c46b38dc PNA |
87 | return -1; |
88 | ||
89 | switch (pkt->tprot) { | |
90 | case IPPROTO_UDP: | |
91 | pkt->inneroff = thoff + sizeof(struct udphdr); | |
92 | break; | |
93 | case IPPROTO_TCP: { | |
94 | struct tcphdr *th, _tcph; | |
95 | ||
96 | th = skb_header_pointer(pkt->skb, thoff, sizeof(_tcph), &_tcph); | |
97 | if (!th) | |
98 | return -1; | |
99 | ||
100 | pkt->inneroff = thoff + __tcp_hdrlen(th); | |
101 | } | |
102 | break; | |
103 | default: | |
104 | return -1; | |
105 | } | |
106 | ||
107 | pkt->flags |= NFT_PKTINFO_INNER; | |
108 | ||
109 | return 0; | |
110 | } | |
111 | ||
112 | static int nft_payload_inner_offset(const struct nft_pktinfo *pkt) | |
113 | { | |
114 | if (!(pkt->flags & NFT_PKTINFO_INNER) && | |
115 | __nft_payload_inner_offset((struct nft_pktinfo *)pkt) < 0) | |
116 | return -1; | |
117 | ||
118 | return pkt->inneroff; | |
119 | } | |
120 | ||
10870dd8 FW |
121 | void nft_payload_eval(const struct nft_expr *expr, |
122 | struct nft_regs *regs, | |
123 | const struct nft_pktinfo *pkt) | |
96518518 PM |
124 | { |
125 | const struct nft_payload *priv = nft_expr_priv(expr); | |
126 | const struct sk_buff *skb = pkt->skb; | |
49499c3e | 127 | u32 *dest = ®s->data[priv->dreg]; |
96518518 PM |
128 | int offset; |
129 | ||
1e105e6a FW |
130 | if (priv->len % NFT_REG32_SIZE) |
131 | dest[priv->len / NFT_REG32_SIZE] = 0; | |
132 | ||
96518518 PM |
133 | switch (priv->base) { |
134 | case NFT_PAYLOAD_LL_HEADER: | |
135 | if (!skb_mac_header_was_set(skb)) | |
136 | goto err; | |
8cfd23e6 FW |
137 | |
138 | if (skb_vlan_tag_present(skb)) { | |
139 | if (!nft_payload_copy_vlan(dest, skb, | |
140 | priv->offset, priv->len)) | |
141 | goto err; | |
142 | return; | |
143 | } | |
96518518 PM |
144 | offset = skb_mac_header(skb) - skb->data; |
145 | break; | |
146 | case NFT_PAYLOAD_NETWORK_HEADER: | |
147 | offset = skb_network_offset(skb); | |
148 | break; | |
149 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
a9e8503d | 150 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
a20877b5 | 151 | goto err; |
2d7b4ace | 152 | offset = nft_thoff(pkt); |
96518518 | 153 | break; |
c46b38dc PNA |
154 | case NFT_PAYLOAD_INNER_HEADER: |
155 | offset = nft_payload_inner_offset(pkt); | |
156 | if (offset < 0) | |
157 | goto err; | |
158 | break; | |
96518518 | 159 | default: |
8801d791 PNA |
160 | WARN_ON_ONCE(1); |
161 | goto err; | |
96518518 PM |
162 | } |
163 | offset += priv->offset; | |
164 | ||
fad136ea | 165 | if (skb_copy_bits(skb, offset, dest, priv->len) < 0) |
96518518 PM |
166 | goto err; |
167 | return; | |
168 | err: | |
a55e22e9 | 169 | regs->verdict.code = NFT_BREAK; |
96518518 PM |
170 | } |
171 | ||
172 | static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = { | |
7ec3f7b4 PM |
173 | [NFTA_PAYLOAD_SREG] = { .type = NLA_U32 }, |
174 | [NFTA_PAYLOAD_DREG] = { .type = NLA_U32 }, | |
175 | [NFTA_PAYLOAD_BASE] = { .type = NLA_U32 }, | |
e7af210e FW |
176 | [NFTA_PAYLOAD_OFFSET] = NLA_POLICY_MAX_BE(NLA_U32, 255), |
177 | [NFTA_PAYLOAD_LEN] = NLA_POLICY_MAX_BE(NLA_U32, 255), | |
7ec3f7b4 | 178 | [NFTA_PAYLOAD_CSUM_TYPE] = { .type = NLA_U32 }, |
e7af210e | 179 | [NFTA_PAYLOAD_CSUM_OFFSET] = NLA_POLICY_MAX_BE(NLA_U32, 255), |
9d6effb2 | 180 | [NFTA_PAYLOAD_CSUM_FLAGS] = { .type = NLA_U32 }, |
96518518 PM |
181 | }; |
182 | ||
183 | static int nft_payload_init(const struct nft_ctx *ctx, | |
184 | const struct nft_expr *expr, | |
185 | const struct nlattr * const tb[]) | |
186 | { | |
187 | struct nft_payload *priv = nft_expr_priv(expr); | |
96518518 | 188 | |
c29b72e0 | 189 | priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); |
96518518 PM |
190 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); |
191 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); | |
96518518 | 192 | |
345023b0 PNA |
193 | return nft_parse_register_store(ctx, tb[NFTA_PAYLOAD_DREG], |
194 | &priv->dreg, NULL, NFT_DATA_VALUE, | |
195 | priv->len); | |
96518518 PM |
196 | } |
197 | ||
198 | static int nft_payload_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
199 | { | |
200 | const struct nft_payload *priv = nft_expr_priv(expr); | |
201 | ||
b1c96ed3 | 202 | if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) || |
96518518 PM |
203 | nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || |
204 | nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || | |
205 | nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len))) | |
206 | goto nla_put_failure; | |
207 | return 0; | |
208 | ||
209 | nla_put_failure: | |
210 | return -1; | |
211 | } | |
212 | ||
a7c176bf PNA |
213 | static bool nft_payload_reduce(struct nft_regs_track *track, |
214 | const struct nft_expr *expr) | |
215 | { | |
216 | const struct nft_payload *priv = nft_expr_priv(expr); | |
217 | const struct nft_payload *payload; | |
218 | ||
34cc9e52 PNA |
219 | if (!nft_reg_track_cmp(track, expr, priv->dreg)) { |
220 | nft_reg_track_update(track, expr, priv->dreg, priv->len); | |
a7c176bf PNA |
221 | return false; |
222 | } | |
223 | ||
224 | payload = nft_expr_priv(track->regs[priv->dreg].selector); | |
225 | if (priv->base != payload->base || | |
226 | priv->offset != payload->offset || | |
227 | priv->len != payload->len) { | |
34cc9e52 | 228 | nft_reg_track_update(track, expr, priv->dreg, priv->len); |
a7c176bf PNA |
229 | return false; |
230 | } | |
231 | ||
232 | if (!track->regs[priv->dreg].bitwise) | |
233 | return true; | |
234 | ||
be5650f8 | 235 | return nft_expr_reduce_bitwise(track, expr); |
a7c176bf PNA |
236 | } |
237 | ||
a5d45bc0 PNA |
238 | static bool nft_payload_offload_mask(struct nft_offload_reg *reg, |
239 | u32 priv_len, u32 field_len) | |
240 | { | |
241 | unsigned int remainder, delta, k; | |
242 | struct nft_data mask = {}; | |
243 | __be32 remainder_mask; | |
244 | ||
245 | if (priv_len == field_len) { | |
246 | memset(®->mask, 0xff, priv_len); | |
247 | return true; | |
248 | } else if (priv_len > field_len) { | |
249 | return false; | |
250 | } | |
251 | ||
252 | memset(&mask, 0xff, field_len); | |
253 | remainder = priv_len % sizeof(u32); | |
254 | if (remainder) { | |
255 | k = priv_len / sizeof(u32); | |
256 | delta = field_len - priv_len; | |
257 | remainder_mask = htonl(~((1 << (delta * BITS_PER_BYTE)) - 1)); | |
258 | mask.data[k] = (__force u32)remainder_mask; | |
259 | } | |
260 | ||
261 | memcpy(®->mask, &mask, field_len); | |
262 | ||
263 | return true; | |
264 | } | |
265 | ||
c9626a2c PNA |
266 | static int nft_payload_offload_ll(struct nft_offload_ctx *ctx, |
267 | struct nft_flow_rule *flow, | |
268 | const struct nft_payload *priv) | |
269 | { | |
270 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
271 | ||
272 | switch (priv->offset) { | |
273 | case offsetof(struct ethhdr, h_source): | |
a5d45bc0 | 274 | if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN)) |
a69a85da | 275 | return -EOPNOTSUPP; |
276 | ||
c9626a2c PNA |
277 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs, |
278 | src, ETH_ALEN, reg); | |
279 | break; | |
280 | case offsetof(struct ethhdr, h_dest): | |
a5d45bc0 | 281 | if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN)) |
a69a85da | 282 | return -EOPNOTSUPP; |
283 | ||
c9626a2c PNA |
284 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs, |
285 | dst, ETH_ALEN, reg); | |
286 | break; | |
a82055af | 287 | case offsetof(struct ethhdr, h_proto): |
a5d45bc0 | 288 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a82055af PNA |
289 | return -EOPNOTSUPP; |
290 | ||
291 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, | |
292 | n_proto, sizeof(__be16), reg); | |
293 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); | |
294 | break; | |
295 | case offsetof(struct vlan_ethhdr, h_vlan_TCI): | |
a5d45bc0 | 296 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a82055af PNA |
297 | return -EOPNOTSUPP; |
298 | ||
ff4d90a8 PNA |
299 | NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_VLAN, vlan, |
300 | vlan_tci, sizeof(__be16), reg, | |
301 | NFT_OFFLOAD_F_NETWORK2HOST); | |
a82055af PNA |
302 | break; |
303 | case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto): | |
a5d45bc0 | 304 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a82055af PNA |
305 | return -EOPNOTSUPP; |
306 | ||
307 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan, | |
308 | vlan_tpid, sizeof(__be16), reg); | |
89d8fd44 PNA |
309 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
310 | break; | |
311 | case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr): | |
a5d45bc0 | 312 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
89d8fd44 PNA |
313 | return -EOPNOTSUPP; |
314 | ||
ff4d90a8 PNA |
315 | NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_CVLAN, cvlan, |
316 | vlan_tci, sizeof(__be16), reg, | |
317 | NFT_OFFLOAD_F_NETWORK2HOST); | |
89d8fd44 PNA |
318 | break; |
319 | case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto) + | |
320 | sizeof(struct vlan_hdr): | |
a5d45bc0 | 321 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
89d8fd44 PNA |
322 | return -EOPNOTSUPP; |
323 | ||
14c20643 | 324 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, cvlan, |
89d8fd44 | 325 | vlan_tpid, sizeof(__be16), reg); |
14c20643 | 326 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
a82055af | 327 | break; |
a69a85da | 328 | default: |
329 | return -EOPNOTSUPP; | |
c9626a2c PNA |
330 | } |
331 | ||
332 | return 0; | |
333 | } | |
334 | ||
335 | static int nft_payload_offload_ip(struct nft_offload_ctx *ctx, | |
336 | struct nft_flow_rule *flow, | |
337 | const struct nft_payload *priv) | |
338 | { | |
339 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
340 | ||
341 | switch (priv->offset) { | |
342 | case offsetof(struct iphdr, saddr): | |
a5d45bc0 PNA |
343 | if (!nft_payload_offload_mask(reg, priv->len, |
344 | sizeof(struct in_addr))) | |
a69a85da | 345 | return -EOPNOTSUPP; |
346 | ||
c9626a2c PNA |
347 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, src, |
348 | sizeof(struct in_addr), reg); | |
3c78e9e0 | 349 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS); |
c9626a2c PNA |
350 | break; |
351 | case offsetof(struct iphdr, daddr): | |
a5d45bc0 PNA |
352 | if (!nft_payload_offload_mask(reg, priv->len, |
353 | sizeof(struct in_addr))) | |
a69a85da | 354 | return -EOPNOTSUPP; |
355 | ||
c9626a2c PNA |
356 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, dst, |
357 | sizeof(struct in_addr), reg); | |
3c78e9e0 | 358 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS); |
c9626a2c PNA |
359 | break; |
360 | case offsetof(struct iphdr, protocol): | |
a5d45bc0 | 361 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8))) |
a69a85da | 362 | return -EOPNOTSUPP; |
363 | ||
c9626a2c PNA |
364 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, |
365 | sizeof(__u8), reg); | |
366 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); | |
367 | break; | |
368 | default: | |
369 | return -EOPNOTSUPP; | |
370 | } | |
371 | ||
372 | return 0; | |
373 | } | |
374 | ||
375 | static int nft_payload_offload_ip6(struct nft_offload_ctx *ctx, | |
376 | struct nft_flow_rule *flow, | |
377 | const struct nft_payload *priv) | |
378 | { | |
379 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
380 | ||
381 | switch (priv->offset) { | |
382 | case offsetof(struct ipv6hdr, saddr): | |
a5d45bc0 PNA |
383 | if (!nft_payload_offload_mask(reg, priv->len, |
384 | sizeof(struct in6_addr))) | |
a69a85da | 385 | return -EOPNOTSUPP; |
386 | ||
c9626a2c PNA |
387 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, src, |
388 | sizeof(struct in6_addr), reg); | |
3c78e9e0 | 389 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS); |
c9626a2c PNA |
390 | break; |
391 | case offsetof(struct ipv6hdr, daddr): | |
a5d45bc0 PNA |
392 | if (!nft_payload_offload_mask(reg, priv->len, |
393 | sizeof(struct in6_addr))) | |
a69a85da | 394 | return -EOPNOTSUPP; |
395 | ||
c9626a2c PNA |
396 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, dst, |
397 | sizeof(struct in6_addr), reg); | |
3c78e9e0 | 398 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS); |
c9626a2c PNA |
399 | break; |
400 | case offsetof(struct ipv6hdr, nexthdr): | |
a5d45bc0 | 401 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8))) |
a69a85da | 402 | return -EOPNOTSUPP; |
403 | ||
c9626a2c PNA |
404 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, |
405 | sizeof(__u8), reg); | |
406 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); | |
407 | break; | |
408 | default: | |
409 | return -EOPNOTSUPP; | |
410 | } | |
411 | ||
412 | return 0; | |
413 | } | |
414 | ||
415 | static int nft_payload_offload_nh(struct nft_offload_ctx *ctx, | |
416 | struct nft_flow_rule *flow, | |
417 | const struct nft_payload *priv) | |
418 | { | |
419 | int err; | |
420 | ||
421 | switch (ctx->dep.l3num) { | |
422 | case htons(ETH_P_IP): | |
423 | err = nft_payload_offload_ip(ctx, flow, priv); | |
424 | break; | |
425 | case htons(ETH_P_IPV6): | |
426 | err = nft_payload_offload_ip6(ctx, flow, priv); | |
427 | break; | |
428 | default: | |
429 | return -EOPNOTSUPP; | |
430 | } | |
431 | ||
432 | return err; | |
433 | } | |
434 | ||
435 | static int nft_payload_offload_tcp(struct nft_offload_ctx *ctx, | |
436 | struct nft_flow_rule *flow, | |
437 | const struct nft_payload *priv) | |
438 | { | |
439 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
440 | ||
441 | switch (priv->offset) { | |
442 | case offsetof(struct tcphdr, source): | |
a5d45bc0 | 443 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 444 | return -EOPNOTSUPP; |
445 | ||
c9626a2c PNA |
446 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src, |
447 | sizeof(__be16), reg); | |
448 | break; | |
449 | case offsetof(struct tcphdr, dest): | |
a5d45bc0 | 450 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 451 | return -EOPNOTSUPP; |
452 | ||
c9626a2c PNA |
453 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst, |
454 | sizeof(__be16), reg); | |
455 | break; | |
456 | default: | |
457 | return -EOPNOTSUPP; | |
458 | } | |
459 | ||
460 | return 0; | |
461 | } | |
462 | ||
463 | static int nft_payload_offload_udp(struct nft_offload_ctx *ctx, | |
464 | struct nft_flow_rule *flow, | |
465 | const struct nft_payload *priv) | |
466 | { | |
467 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; | |
468 | ||
469 | switch (priv->offset) { | |
470 | case offsetof(struct udphdr, source): | |
a5d45bc0 | 471 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 472 | return -EOPNOTSUPP; |
473 | ||
c9626a2c PNA |
474 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src, |
475 | sizeof(__be16), reg); | |
476 | break; | |
477 | case offsetof(struct udphdr, dest): | |
a5d45bc0 | 478 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
a69a85da | 479 | return -EOPNOTSUPP; |
480 | ||
c9626a2c PNA |
481 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst, |
482 | sizeof(__be16), reg); | |
483 | break; | |
484 | default: | |
485 | return -EOPNOTSUPP; | |
486 | } | |
487 | ||
488 | return 0; | |
489 | } | |
490 | ||
491 | static int nft_payload_offload_th(struct nft_offload_ctx *ctx, | |
492 | struct nft_flow_rule *flow, | |
493 | const struct nft_payload *priv) | |
494 | { | |
495 | int err; | |
496 | ||
497 | switch (ctx->dep.protonum) { | |
498 | case IPPROTO_TCP: | |
499 | err = nft_payload_offload_tcp(ctx, flow, priv); | |
500 | break; | |
501 | case IPPROTO_UDP: | |
502 | err = nft_payload_offload_udp(ctx, flow, priv); | |
503 | break; | |
504 | default: | |
505 | return -EOPNOTSUPP; | |
506 | } | |
507 | ||
508 | return err; | |
509 | } | |
510 | ||
511 | static int nft_payload_offload(struct nft_offload_ctx *ctx, | |
512 | struct nft_flow_rule *flow, | |
513 | const struct nft_expr *expr) | |
514 | { | |
515 | const struct nft_payload *priv = nft_expr_priv(expr); | |
516 | int err; | |
517 | ||
518 | switch (priv->base) { | |
519 | case NFT_PAYLOAD_LL_HEADER: | |
520 | err = nft_payload_offload_ll(ctx, flow, priv); | |
521 | break; | |
522 | case NFT_PAYLOAD_NETWORK_HEADER: | |
523 | err = nft_payload_offload_nh(ctx, flow, priv); | |
524 | break; | |
525 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
526 | err = nft_payload_offload_th(ctx, flow, priv); | |
527 | break; | |
528 | default: | |
529 | err = -EOPNOTSUPP; | |
530 | break; | |
531 | } | |
532 | return err; | |
533 | } | |
534 | ||
ef1f7df9 PM |
535 | static const struct nft_expr_ops nft_payload_ops = { |
536 | .type = &nft_payload_type, | |
96518518 | 537 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), |
96518518 PM |
538 | .eval = nft_payload_eval, |
539 | .init = nft_payload_init, | |
540 | .dump = nft_payload_dump, | |
a7c176bf | 541 | .reduce = nft_payload_reduce, |
c9626a2c | 542 | .offload = nft_payload_offload, |
ef1f7df9 PM |
543 | }; |
544 | ||
c29b72e0 PM |
545 | const struct nft_expr_ops nft_payload_fast_ops = { |
546 | .type = &nft_payload_type, | |
547 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), | |
548 | .eval = nft_payload_eval, | |
549 | .init = nft_payload_init, | |
550 | .dump = nft_payload_dump, | |
a7c176bf | 551 | .reduce = nft_payload_reduce, |
c9626a2c | 552 | .offload = nft_payload_offload, |
c29b72e0 PM |
553 | }; |
554 | ||
18140969 PNA |
555 | static inline void nft_csum_replace(__sum16 *sum, __wsum fsum, __wsum tsum) |
556 | { | |
557 | *sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), fsum), tsum)); | |
558 | if (*sum == 0) | |
559 | *sum = CSUM_MANGLED_0; | |
560 | } | |
561 | ||
562 | static bool nft_payload_udp_checksum(struct sk_buff *skb, unsigned int thoff) | |
563 | { | |
564 | struct udphdr *uh, _uh; | |
565 | ||
566 | uh = skb_header_pointer(skb, thoff, sizeof(_uh), &_uh); | |
567 | if (!uh) | |
568 | return false; | |
569 | ||
5fd02ebe | 570 | return (__force bool)uh->check; |
18140969 PNA |
571 | } |
572 | ||
573 | static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt, | |
574 | struct sk_buff *skb, | |
575 | unsigned int *l4csum_offset) | |
576 | { | |
4e1860a3 PNA |
577 | if (pkt->fragoff) |
578 | return -1; | |
579 | ||
18140969 PNA |
580 | switch (pkt->tprot) { |
581 | case IPPROTO_TCP: | |
582 | *l4csum_offset = offsetof(struct tcphdr, check); | |
583 | break; | |
584 | case IPPROTO_UDP: | |
2d7b4ace | 585 | if (!nft_payload_udp_checksum(skb, nft_thoff(pkt))) |
18140969 | 586 | return -1; |
954d8297 | 587 | fallthrough; |
18140969 PNA |
588 | case IPPROTO_UDPLITE: |
589 | *l4csum_offset = offsetof(struct udphdr, check); | |
590 | break; | |
591 | case IPPROTO_ICMPV6: | |
592 | *l4csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); | |
593 | break; | |
594 | default: | |
595 | return -1; | |
596 | } | |
597 | ||
2d7b4ace | 598 | *l4csum_offset += nft_thoff(pkt); |
18140969 PNA |
599 | return 0; |
600 | } | |
601 | ||
346e320c DC |
602 | static int nft_payload_csum_sctp(struct sk_buff *skb, int offset) |
603 | { | |
604 | struct sctphdr *sh; | |
605 | ||
606 | if (skb_ensure_writable(skb, offset + sizeof(*sh))) | |
607 | return -1; | |
608 | ||
609 | sh = (struct sctphdr *)(skb->data + offset); | |
610 | sh->checksum = sctp_compute_cksum(skb, offset); | |
611 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
612 | return 0; | |
613 | } | |
614 | ||
18140969 PNA |
615 | static int nft_payload_l4csum_update(const struct nft_pktinfo *pkt, |
616 | struct sk_buff *skb, | |
617 | __wsum fsum, __wsum tsum) | |
618 | { | |
619 | int l4csum_offset; | |
620 | __sum16 sum; | |
621 | ||
622 | /* If we cannot determine layer 4 checksum offset or this packet doesn't | |
623 | * require layer 4 checksum recalculation, skip this packet. | |
624 | */ | |
625 | if (nft_payload_l4csum_offset(pkt, skb, &l4csum_offset) < 0) | |
626 | return 0; | |
627 | ||
628 | if (skb_copy_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0) | |
629 | return -1; | |
630 | ||
631 | /* Checksum mangling for an arbitrary amount of bytes, based on | |
632 | * inet_proto_csum_replace*() functions. | |
633 | */ | |
634 | if (skb->ip_summed != CHECKSUM_PARTIAL) { | |
635 | nft_csum_replace(&sum, fsum, tsum); | |
636 | if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
637 | skb->csum = ~csum_add(csum_sub(~(skb->csum), fsum), | |
638 | tsum); | |
639 | } | |
640 | } else { | |
641 | sum = ~csum_fold(csum_add(csum_sub(csum_unfold(sum), fsum), | |
642 | tsum)); | |
643 | } | |
644 | ||
7418ee4c | 645 | if (skb_ensure_writable(skb, l4csum_offset + sizeof(sum)) || |
18140969 PNA |
646 | skb_store_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0) |
647 | return -1; | |
648 | ||
649 | return 0; | |
650 | } | |
651 | ||
053d20f5 PNA |
652 | static int nft_payload_csum_inet(struct sk_buff *skb, const u32 *src, |
653 | __wsum fsum, __wsum tsum, int csum_offset) | |
654 | { | |
655 | __sum16 sum; | |
656 | ||
657 | if (skb_copy_bits(skb, csum_offset, &sum, sizeof(sum)) < 0) | |
658 | return -1; | |
659 | ||
660 | nft_csum_replace(&sum, fsum, tsum); | |
7418ee4c | 661 | if (skb_ensure_writable(skb, csum_offset + sizeof(sum)) || |
053d20f5 PNA |
662 | skb_store_bits(skb, csum_offset, &sum, sizeof(sum)) < 0) |
663 | return -1; | |
664 | ||
665 | return 0; | |
666 | } | |
667 | ||
7ec3f7b4 PM |
668 | static void nft_payload_set_eval(const struct nft_expr *expr, |
669 | struct nft_regs *regs, | |
670 | const struct nft_pktinfo *pkt) | |
671 | { | |
672 | const struct nft_payload_set *priv = nft_expr_priv(expr); | |
673 | struct sk_buff *skb = pkt->skb; | |
674 | const u32 *src = ®s->data[priv->sreg]; | |
675 | int offset, csum_offset; | |
676 | __wsum fsum, tsum; | |
7ec3f7b4 PM |
677 | |
678 | switch (priv->base) { | |
679 | case NFT_PAYLOAD_LL_HEADER: | |
680 | if (!skb_mac_header_was_set(skb)) | |
681 | goto err; | |
682 | offset = skb_mac_header(skb) - skb->data; | |
683 | break; | |
684 | case NFT_PAYLOAD_NETWORK_HEADER: | |
685 | offset = skb_network_offset(skb); | |
686 | break; | |
687 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
a9e8503d | 688 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
a20877b5 | 689 | goto err; |
2d7b4ace | 690 | offset = nft_thoff(pkt); |
7ec3f7b4 | 691 | break; |
c46b38dc PNA |
692 | case NFT_PAYLOAD_INNER_HEADER: |
693 | offset = nft_payload_inner_offset(pkt); | |
694 | if (offset < 0) | |
695 | goto err; | |
696 | break; | |
7ec3f7b4 | 697 | default: |
8801d791 PNA |
698 | WARN_ON_ONCE(1); |
699 | goto err; | |
7ec3f7b4 PM |
700 | } |
701 | ||
702 | csum_offset = offset + priv->csum_offset; | |
703 | offset += priv->offset; | |
704 | ||
053d20f5 | 705 | if ((priv->csum_type == NFT_PAYLOAD_CSUM_INET || priv->csum_flags) && |
c46b38dc PNA |
706 | ((priv->base != NFT_PAYLOAD_TRANSPORT_HEADER && |
707 | priv->base != NFT_PAYLOAD_INNER_HEADER) || | |
7ec3f7b4 | 708 | skb->ip_summed != CHECKSUM_PARTIAL)) { |
7ec3f7b4 PM |
709 | fsum = skb_checksum(skb, offset, priv->len, 0); |
710 | tsum = csum_partial(src, priv->len, 0); | |
7ec3f7b4 | 711 | |
053d20f5 PNA |
712 | if (priv->csum_type == NFT_PAYLOAD_CSUM_INET && |
713 | nft_payload_csum_inet(skb, src, fsum, tsum, csum_offset)) | |
7ec3f7b4 | 714 | goto err; |
18140969 PNA |
715 | |
716 | if (priv->csum_flags && | |
717 | nft_payload_l4csum_update(pkt, skb, fsum, tsum) < 0) | |
718 | goto err; | |
7ec3f7b4 PM |
719 | } |
720 | ||
7418ee4c | 721 | if (skb_ensure_writable(skb, max(offset + priv->len, 0)) || |
7ec3f7b4 PM |
722 | skb_store_bits(skb, offset, src, priv->len) < 0) |
723 | goto err; | |
724 | ||
346e320c DC |
725 | if (priv->csum_type == NFT_PAYLOAD_CSUM_SCTP && |
726 | pkt->tprot == IPPROTO_SCTP && | |
727 | skb->ip_summed != CHECKSUM_PARTIAL) { | |
a9e8503d FW |
728 | if (pkt->fragoff == 0 && |
729 | nft_payload_csum_sctp(skb, nft_thoff(pkt))) | |
346e320c DC |
730 | goto err; |
731 | } | |
732 | ||
7ec3f7b4 PM |
733 | return; |
734 | err: | |
735 | regs->verdict.code = NFT_BREAK; | |
736 | } | |
737 | ||
738 | static int nft_payload_set_init(const struct nft_ctx *ctx, | |
739 | const struct nft_expr *expr, | |
740 | const struct nlattr * const tb[]) | |
741 | { | |
742 | struct nft_payload_set *priv = nft_expr_priv(expr); | |
7044ab28 PNA |
743 | u32 csum_offset, csum_type = NFT_PAYLOAD_CSUM_NONE; |
744 | int err; | |
7ec3f7b4 PM |
745 | |
746 | priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); | |
747 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); | |
748 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); | |
7ec3f7b4 PM |
749 | |
750 | if (tb[NFTA_PAYLOAD_CSUM_TYPE]) | |
7044ab28 PNA |
751 | csum_type = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_TYPE])); |
752 | if (tb[NFTA_PAYLOAD_CSUM_OFFSET]) { | |
753 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_CSUM_OFFSET], U8_MAX, | |
754 | &csum_offset); | |
755 | if (err < 0) | |
756 | return err; | |
757 | ||
758 | priv->csum_offset = csum_offset; | |
759 | } | |
18140969 PNA |
760 | if (tb[NFTA_PAYLOAD_CSUM_FLAGS]) { |
761 | u32 flags; | |
762 | ||
763 | flags = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_FLAGS])); | |
764 | if (flags & ~NFT_PAYLOAD_L4CSUM_PSEUDOHDR) | |
765 | return -EINVAL; | |
766 | ||
767 | priv->csum_flags = flags; | |
768 | } | |
7ec3f7b4 | 769 | |
7044ab28 | 770 | switch (csum_type) { |
7ec3f7b4 PM |
771 | case NFT_PAYLOAD_CSUM_NONE: |
772 | case NFT_PAYLOAD_CSUM_INET: | |
773 | break; | |
346e320c DC |
774 | case NFT_PAYLOAD_CSUM_SCTP: |
775 | if (priv->base != NFT_PAYLOAD_TRANSPORT_HEADER) | |
776 | return -EINVAL; | |
777 | ||
778 | if (priv->csum_offset != offsetof(struct sctphdr, checksum)) | |
779 | return -EINVAL; | |
780 | break; | |
7ec3f7b4 PM |
781 | default: |
782 | return -EOPNOTSUPP; | |
783 | } | |
7044ab28 | 784 | priv->csum_type = csum_type; |
7ec3f7b4 | 785 | |
4f16d25c PNA |
786 | return nft_parse_register_load(tb[NFTA_PAYLOAD_SREG], &priv->sreg, |
787 | priv->len); | |
7ec3f7b4 PM |
788 | } |
789 | ||
790 | static int nft_payload_set_dump(struct sk_buff *skb, const struct nft_expr *expr) | |
791 | { | |
792 | const struct nft_payload_set *priv = nft_expr_priv(expr); | |
793 | ||
794 | if (nft_dump_register(skb, NFTA_PAYLOAD_SREG, priv->sreg) || | |
795 | nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || | |
796 | nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || | |
797 | nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)) || | |
798 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_TYPE, htonl(priv->csum_type)) || | |
799 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_OFFSET, | |
18140969 PNA |
800 | htonl(priv->csum_offset)) || |
801 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_FLAGS, htonl(priv->csum_flags))) | |
7ec3f7b4 PM |
802 | goto nla_put_failure; |
803 | return 0; | |
804 | ||
805 | nla_put_failure: | |
806 | return -1; | |
807 | } | |
808 | ||
cc003c7e PNA |
809 | static bool nft_payload_set_reduce(struct nft_regs_track *track, |
810 | const struct nft_expr *expr) | |
811 | { | |
812 | int i; | |
813 | ||
814 | for (i = 0; i < NFT_REG32_NUM; i++) { | |
815 | if (!track->regs[i].selector) | |
816 | continue; | |
817 | ||
818 | if (track->regs[i].selector->ops != &nft_payload_ops && | |
819 | track->regs[i].selector->ops != &nft_payload_fast_ops) | |
820 | continue; | |
821 | ||
34cc9e52 | 822 | __nft_reg_track_cancel(track, i); |
cc003c7e PNA |
823 | } |
824 | ||
825 | return false; | |
826 | } | |
827 | ||
7ec3f7b4 PM |
828 | static const struct nft_expr_ops nft_payload_set_ops = { |
829 | .type = &nft_payload_type, | |
830 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload_set)), | |
831 | .eval = nft_payload_set_eval, | |
832 | .init = nft_payload_set_init, | |
833 | .dump = nft_payload_set_dump, | |
cc003c7e | 834 | .reduce = nft_payload_set_reduce, |
7ec3f7b4 PM |
835 | }; |
836 | ||
0ca743a5 PNA |
837 | static const struct nft_expr_ops * |
838 | nft_payload_select_ops(const struct nft_ctx *ctx, | |
839 | const struct nlattr * const tb[]) | |
c29b72e0 PM |
840 | { |
841 | enum nft_payload_bases base; | |
842 | unsigned int offset, len; | |
94254f99 | 843 | int err; |
c29b72e0 | 844 | |
7ec3f7b4 | 845 | if (tb[NFTA_PAYLOAD_BASE] == NULL || |
c29b72e0 PM |
846 | tb[NFTA_PAYLOAD_OFFSET] == NULL || |
847 | tb[NFTA_PAYLOAD_LEN] == NULL) | |
848 | return ERR_PTR(-EINVAL); | |
849 | ||
850 | base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); | |
851 | switch (base) { | |
852 | case NFT_PAYLOAD_LL_HEADER: | |
853 | case NFT_PAYLOAD_NETWORK_HEADER: | |
854 | case NFT_PAYLOAD_TRANSPORT_HEADER: | |
c46b38dc | 855 | case NFT_PAYLOAD_INNER_HEADER: |
c29b72e0 PM |
856 | break; |
857 | default: | |
858 | return ERR_PTR(-EOPNOTSUPP); | |
859 | } | |
860 | ||
7ec3f7b4 PM |
861 | if (tb[NFTA_PAYLOAD_SREG] != NULL) { |
862 | if (tb[NFTA_PAYLOAD_DREG] != NULL) | |
863 | return ERR_PTR(-EINVAL); | |
864 | return &nft_payload_set_ops; | |
865 | } | |
866 | ||
867 | if (tb[NFTA_PAYLOAD_DREG] == NULL) | |
868 | return ERR_PTR(-EINVAL); | |
869 | ||
94254f99 PNA |
870 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_OFFSET], U8_MAX, &offset); |
871 | if (err < 0) | |
872 | return ERR_PTR(err); | |
873 | ||
874 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_LEN], U8_MAX, &len); | |
875 | if (err < 0) | |
876 | return ERR_PTR(err); | |
c29b72e0 | 877 | |
f627ed91 | 878 | if (len <= 4 && is_power_of_2(len) && IS_ALIGNED(offset, len) && |
c46b38dc | 879 | base != NFT_PAYLOAD_LL_HEADER && base != NFT_PAYLOAD_INNER_HEADER) |
c29b72e0 PM |
880 | return &nft_payload_fast_ops; |
881 | else | |
882 | return &nft_payload_ops; | |
883 | } | |
884 | ||
4e24877e | 885 | struct nft_expr_type nft_payload_type __read_mostly = { |
ef1f7df9 | 886 | .name = "payload", |
c29b72e0 | 887 | .select_ops = nft_payload_select_ops, |
96518518 PM |
888 | .policy = nft_payload_policy, |
889 | .maxattr = NFTA_PAYLOAD_MAX, | |
ef1f7df9 | 890 | .owner = THIS_MODULE, |
96518518 | 891 | }; |