1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
4 * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
6 * Development of this code funded by Astaro AG (http://www.astaro.com/)
9 #include <linux/kernel.h>
10 #include <linux/if_vlan.h>
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>
18 #include <net/netfilter/nf_tables_offload.h>
19 /* For layer 4 checksum field offset. */
20 #include <linux/tcp.h>
21 #include <linux/udp.h>
22 #include <linux/icmpv6.h>
24 #include <linux/ipv6.h>
25 #include <net/sctp/checksum.h>
27 static bool nft_payload_rebuild_vlan_hdr(const struct sk_buff *skb, int mac_off,
28 struct vlan_ethhdr *veth)
30 if (skb_copy_bits(skb, mac_off, veth, ETH_HLEN))
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;
40 /* add vlan header into the user buffer for if tag was removed by offloads */
42 nft_payload_copy_vlan(u32 *d, const struct sk_buff *skb, u8 offset, u8 len)
44 int mac_off = skb_mac_header(skb) - skb->data;
45 u8 *vlanh, *dst_u8 = (u8 *) d;
46 struct vlan_ethhdr veth;
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;
55 if (offset < VLAN_ETH_HLEN + vlan_hlen) {
59 skb_copy_bits(skb, mac_off, &veth, VLAN_ETH_HLEN) < 0)
61 else if (!nft_payload_rebuild_vlan_hdr(skb, mac_off, &veth))
64 if (offset + len > VLAN_ETH_HLEN + vlan_hlen)
65 ethlen -= offset + len - VLAN_ETH_HLEN + vlan_hlen;
67 memcpy(dst_u8, vlanh + offset - vlan_hlen, ethlen);
74 offset = ETH_HLEN + vlan_hlen;
76 offset -= VLAN_HLEN + vlan_hlen;
79 return skb_copy_bits(skb, offset + mac_off, dst_u8, len) == 0;
82 static int __nft_payload_inner_offset(struct nft_pktinfo *pkt)
84 unsigned int thoff = nft_thoff(pkt);
86 if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff)
91 pkt->inneroff = thoff + sizeof(struct udphdr);
94 struct tcphdr *th, _tcph;
96 th = skb_header_pointer(pkt->skb, thoff, sizeof(_tcph), &_tcph);
100 pkt->inneroff = thoff + __tcp_hdrlen(th);
107 pkt->flags |= NFT_PKTINFO_INNER;
112 static int nft_payload_inner_offset(const struct nft_pktinfo *pkt)
114 if (!(pkt->flags & NFT_PKTINFO_INNER) &&
115 __nft_payload_inner_offset((struct nft_pktinfo *)pkt) < 0)
118 return pkt->inneroff;
121 void nft_payload_eval(const struct nft_expr *expr,
122 struct nft_regs *regs,
123 const struct nft_pktinfo *pkt)
125 const struct nft_payload *priv = nft_expr_priv(expr);
126 const struct sk_buff *skb = pkt->skb;
127 u32 *dest = ®s->data[priv->dreg];
130 if (priv->len % NFT_REG32_SIZE)
131 dest[priv->len / NFT_REG32_SIZE] = 0;
133 switch (priv->base) {
134 case NFT_PAYLOAD_LL_HEADER:
135 if (!skb_mac_header_was_set(skb))
138 if (skb_vlan_tag_present(skb)) {
139 if (!nft_payload_copy_vlan(dest, skb,
140 priv->offset, priv->len))
144 offset = skb_mac_header(skb) - skb->data;
146 case NFT_PAYLOAD_NETWORK_HEADER:
147 offset = skb_network_offset(skb);
149 case NFT_PAYLOAD_TRANSPORT_HEADER:
150 if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff)
152 offset = nft_thoff(pkt);
154 case NFT_PAYLOAD_INNER_HEADER:
155 offset = nft_payload_inner_offset(pkt);
163 offset += priv->offset;
165 if (skb_copy_bits(skb, offset, dest, priv->len) < 0)
169 regs->verdict.code = NFT_BREAK;
172 static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = {
173 [NFTA_PAYLOAD_SREG] = { .type = NLA_U32 },
174 [NFTA_PAYLOAD_DREG] = { .type = NLA_U32 },
175 [NFTA_PAYLOAD_BASE] = { .type = NLA_U32 },
176 [NFTA_PAYLOAD_OFFSET] = NLA_POLICY_MAX_BE(NLA_U32, 255),
177 [NFTA_PAYLOAD_LEN] = NLA_POLICY_MAX_BE(NLA_U32, 255),
178 [NFTA_PAYLOAD_CSUM_TYPE] = { .type = NLA_U32 },
179 [NFTA_PAYLOAD_CSUM_OFFSET] = NLA_POLICY_MAX_BE(NLA_U32, 255),
180 [NFTA_PAYLOAD_CSUM_FLAGS] = { .type = NLA_U32 },
183 static int nft_payload_init(const struct nft_ctx *ctx,
184 const struct nft_expr *expr,
185 const struct nlattr * const tb[])
187 struct nft_payload *priv = nft_expr_priv(expr);
189 priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
190 priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
191 priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
193 return nft_parse_register_store(ctx, tb[NFTA_PAYLOAD_DREG],
194 &priv->dreg, NULL, NFT_DATA_VALUE,
198 static int nft_payload_dump(struct sk_buff *skb, const struct nft_expr *expr)
200 const struct nft_payload *priv = nft_expr_priv(expr);
202 if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) ||
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;
213 static bool nft_payload_reduce(struct nft_regs_track *track,
214 const struct nft_expr *expr)
216 const struct nft_payload *priv = nft_expr_priv(expr);
217 const struct nft_payload *payload;
219 if (!nft_reg_track_cmp(track, expr, priv->dreg)) {
220 nft_reg_track_update(track, expr, priv->dreg, priv->len);
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) {
228 nft_reg_track_update(track, expr, priv->dreg, priv->len);
232 if (!track->regs[priv->dreg].bitwise)
235 return nft_expr_reduce_bitwise(track, expr);
238 static bool nft_payload_offload_mask(struct nft_offload_reg *reg,
239 u32 priv_len, u32 field_len)
241 unsigned int remainder, delta, k;
242 struct nft_data mask = {};
243 __be32 remainder_mask;
245 if (priv_len == field_len) {
246 memset(®->mask, 0xff, priv_len);
248 } else if (priv_len > field_len) {
252 memset(&mask, 0xff, field_len);
253 remainder = priv_len % sizeof(u32);
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;
261 memcpy(®->mask, &mask, field_len);
266 static int nft_payload_offload_ll(struct nft_offload_ctx *ctx,
267 struct nft_flow_rule *flow,
268 const struct nft_payload *priv)
270 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
272 switch (priv->offset) {
273 case offsetof(struct ethhdr, h_source):
274 if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN))
277 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
280 case offsetof(struct ethhdr, h_dest):
281 if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN))
284 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
287 case offsetof(struct ethhdr, h_proto):
288 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
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);
295 case offsetof(struct vlan_ethhdr, h_vlan_TCI):
296 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
299 NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_VLAN, vlan,
300 vlan_tci, sizeof(__be16), reg,
301 NFT_OFFLOAD_F_NETWORK2HOST);
303 case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto):
304 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
307 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
308 vlan_tpid, sizeof(__be16), reg);
309 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
311 case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr):
312 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
315 NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_CVLAN, cvlan,
316 vlan_tci, sizeof(__be16), reg,
317 NFT_OFFLOAD_F_NETWORK2HOST);
319 case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto) +
320 sizeof(struct vlan_hdr):
321 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
324 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, cvlan,
325 vlan_tpid, sizeof(__be16), reg);
326 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
335 static int nft_payload_offload_ip(struct nft_offload_ctx *ctx,
336 struct nft_flow_rule *flow,
337 const struct nft_payload *priv)
339 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
341 switch (priv->offset) {
342 case offsetof(struct iphdr, saddr):
343 if (!nft_payload_offload_mask(reg, priv->len,
344 sizeof(struct in_addr)))
347 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, src,
348 sizeof(struct in_addr), reg);
349 nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
351 case offsetof(struct iphdr, daddr):
352 if (!nft_payload_offload_mask(reg, priv->len,
353 sizeof(struct in_addr)))
356 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, dst,
357 sizeof(struct in_addr), reg);
358 nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
360 case offsetof(struct iphdr, protocol):
361 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8)))
364 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
366 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
375 static int nft_payload_offload_ip6(struct nft_offload_ctx *ctx,
376 struct nft_flow_rule *flow,
377 const struct nft_payload *priv)
379 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
381 switch (priv->offset) {
382 case offsetof(struct ipv6hdr, saddr):
383 if (!nft_payload_offload_mask(reg, priv->len,
384 sizeof(struct in6_addr)))
387 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, src,
388 sizeof(struct in6_addr), reg);
389 nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
391 case offsetof(struct ipv6hdr, daddr):
392 if (!nft_payload_offload_mask(reg, priv->len,
393 sizeof(struct in6_addr)))
396 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, dst,
397 sizeof(struct in6_addr), reg);
398 nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
400 case offsetof(struct ipv6hdr, nexthdr):
401 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8)))
404 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
406 nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
415 static int nft_payload_offload_nh(struct nft_offload_ctx *ctx,
416 struct nft_flow_rule *flow,
417 const struct nft_payload *priv)
421 switch (ctx->dep.l3num) {
422 case htons(ETH_P_IP):
423 err = nft_payload_offload_ip(ctx, flow, priv);
425 case htons(ETH_P_IPV6):
426 err = nft_payload_offload_ip6(ctx, flow, priv);
435 static int nft_payload_offload_tcp(struct nft_offload_ctx *ctx,
436 struct nft_flow_rule *flow,
437 const struct nft_payload *priv)
439 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
441 switch (priv->offset) {
442 case offsetof(struct tcphdr, source):
443 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
446 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src,
447 sizeof(__be16), reg);
449 case offsetof(struct tcphdr, dest):
450 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
453 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst,
454 sizeof(__be16), reg);
463 static int nft_payload_offload_udp(struct nft_offload_ctx *ctx,
464 struct nft_flow_rule *flow,
465 const struct nft_payload *priv)
467 struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
469 switch (priv->offset) {
470 case offsetof(struct udphdr, source):
471 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
474 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src,
475 sizeof(__be16), reg);
477 case offsetof(struct udphdr, dest):
478 if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
481 NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst,
482 sizeof(__be16), reg);
491 static int nft_payload_offload_th(struct nft_offload_ctx *ctx,
492 struct nft_flow_rule *flow,
493 const struct nft_payload *priv)
497 switch (ctx->dep.protonum) {
499 err = nft_payload_offload_tcp(ctx, flow, priv);
502 err = nft_payload_offload_udp(ctx, flow, priv);
511 static int nft_payload_offload(struct nft_offload_ctx *ctx,
512 struct nft_flow_rule *flow,
513 const struct nft_expr *expr)
515 const struct nft_payload *priv = nft_expr_priv(expr);
518 switch (priv->base) {
519 case NFT_PAYLOAD_LL_HEADER:
520 err = nft_payload_offload_ll(ctx, flow, priv);
522 case NFT_PAYLOAD_NETWORK_HEADER:
523 err = nft_payload_offload_nh(ctx, flow, priv);
525 case NFT_PAYLOAD_TRANSPORT_HEADER:
526 err = nft_payload_offload_th(ctx, flow, priv);
535 static const struct nft_expr_ops nft_payload_ops = {
536 .type = &nft_payload_type,
537 .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)),
538 .eval = nft_payload_eval,
539 .init = nft_payload_init,
540 .dump = nft_payload_dump,
541 .reduce = nft_payload_reduce,
542 .offload = nft_payload_offload,
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,
551 .reduce = nft_payload_reduce,
552 .offload = nft_payload_offload,
555 static inline void nft_csum_replace(__sum16 *sum, __wsum fsum, __wsum tsum)
557 *sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), fsum), tsum));
559 *sum = CSUM_MANGLED_0;
562 static bool nft_payload_udp_checksum(struct sk_buff *skb, unsigned int thoff)
564 struct udphdr *uh, _uh;
566 uh = skb_header_pointer(skb, thoff, sizeof(_uh), &_uh);
570 return (__force bool)uh->check;
573 static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt,
575 unsigned int *l4csum_offset)
580 switch (pkt->tprot) {
582 *l4csum_offset = offsetof(struct tcphdr, check);
585 if (!nft_payload_udp_checksum(skb, nft_thoff(pkt)))
588 case IPPROTO_UDPLITE:
589 *l4csum_offset = offsetof(struct udphdr, check);
592 *l4csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
598 *l4csum_offset += nft_thoff(pkt);
602 static int nft_payload_csum_sctp(struct sk_buff *skb, int offset)
606 if (skb_ensure_writable(skb, offset + sizeof(*sh)))
609 sh = (struct sctphdr *)(skb->data + offset);
610 sh->checksum = sctp_compute_cksum(skb, offset);
611 skb->ip_summed = CHECKSUM_UNNECESSARY;
615 static int nft_payload_l4csum_update(const struct nft_pktinfo *pkt,
617 __wsum fsum, __wsum tsum)
622 /* If we cannot determine layer 4 checksum offset or this packet doesn't
623 * require layer 4 checksum recalculation, skip this packet.
625 if (nft_payload_l4csum_offset(pkt, skb, &l4csum_offset) < 0)
628 if (skb_copy_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0)
631 /* Checksum mangling for an arbitrary amount of bytes, based on
632 * inet_proto_csum_replace*() functions.
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),
641 sum = ~csum_fold(csum_add(csum_sub(csum_unfold(sum), fsum),
645 if (skb_ensure_writable(skb, l4csum_offset + sizeof(sum)) ||
646 skb_store_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0)
652 static int nft_payload_csum_inet(struct sk_buff *skb, const u32 *src,
653 __wsum fsum, __wsum tsum, int csum_offset)
657 if (skb_copy_bits(skb, csum_offset, &sum, sizeof(sum)) < 0)
660 nft_csum_replace(&sum, fsum, tsum);
661 if (skb_ensure_writable(skb, csum_offset + sizeof(sum)) ||
662 skb_store_bits(skb, csum_offset, &sum, sizeof(sum)) < 0)
668 static void nft_payload_set_eval(const struct nft_expr *expr,
669 struct nft_regs *regs,
670 const struct nft_pktinfo *pkt)
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;
678 switch (priv->base) {
679 case NFT_PAYLOAD_LL_HEADER:
680 if (!skb_mac_header_was_set(skb))
682 offset = skb_mac_header(skb) - skb->data;
684 case NFT_PAYLOAD_NETWORK_HEADER:
685 offset = skb_network_offset(skb);
687 case NFT_PAYLOAD_TRANSPORT_HEADER:
688 if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff)
690 offset = nft_thoff(pkt);
692 case NFT_PAYLOAD_INNER_HEADER:
693 offset = nft_payload_inner_offset(pkt);
702 csum_offset = offset + priv->csum_offset;
703 offset += priv->offset;
705 if ((priv->csum_type == NFT_PAYLOAD_CSUM_INET || priv->csum_flags) &&
706 ((priv->base != NFT_PAYLOAD_TRANSPORT_HEADER &&
707 priv->base != NFT_PAYLOAD_INNER_HEADER) ||
708 skb->ip_summed != CHECKSUM_PARTIAL)) {
709 fsum = skb_checksum(skb, offset, priv->len, 0);
710 tsum = csum_partial(src, priv->len, 0);
712 if (priv->csum_type == NFT_PAYLOAD_CSUM_INET &&
713 nft_payload_csum_inet(skb, src, fsum, tsum, csum_offset))
716 if (priv->csum_flags &&
717 nft_payload_l4csum_update(pkt, skb, fsum, tsum) < 0)
721 if (skb_ensure_writable(skb, max(offset + priv->len, 0)) ||
722 skb_store_bits(skb, offset, src, priv->len) < 0)
725 if (priv->csum_type == NFT_PAYLOAD_CSUM_SCTP &&
726 pkt->tprot == IPPROTO_SCTP &&
727 skb->ip_summed != CHECKSUM_PARTIAL) {
728 if (pkt->fragoff == 0 &&
729 nft_payload_csum_sctp(skb, nft_thoff(pkt)))
735 regs->verdict.code = NFT_BREAK;
738 static int nft_payload_set_init(const struct nft_ctx *ctx,
739 const struct nft_expr *expr,
740 const struct nlattr * const tb[])
742 struct nft_payload_set *priv = nft_expr_priv(expr);
743 u32 csum_offset, csum_type = NFT_PAYLOAD_CSUM_NONE;
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]));
750 if (tb[NFTA_PAYLOAD_CSUM_TYPE])
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,
758 priv->csum_offset = csum_offset;
760 if (tb[NFTA_PAYLOAD_CSUM_FLAGS]) {
763 flags = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_FLAGS]));
764 if (flags & ~NFT_PAYLOAD_L4CSUM_PSEUDOHDR)
767 priv->csum_flags = flags;
771 case NFT_PAYLOAD_CSUM_NONE:
772 case NFT_PAYLOAD_CSUM_INET:
774 case NFT_PAYLOAD_CSUM_SCTP:
775 if (priv->base != NFT_PAYLOAD_TRANSPORT_HEADER)
778 if (priv->csum_offset != offsetof(struct sctphdr, checksum))
784 priv->csum_type = csum_type;
786 return nft_parse_register_load(tb[NFTA_PAYLOAD_SREG], &priv->sreg,
790 static int nft_payload_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
792 const struct nft_payload_set *priv = nft_expr_priv(expr);
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,
800 htonl(priv->csum_offset)) ||
801 nla_put_be32(skb, NFTA_PAYLOAD_CSUM_FLAGS, htonl(priv->csum_flags)))
802 goto nla_put_failure;
809 static bool nft_payload_set_reduce(struct nft_regs_track *track,
810 const struct nft_expr *expr)
814 for (i = 0; i < NFT_REG32_NUM; i++) {
815 if (!track->regs[i].selector)
818 if (track->regs[i].selector->ops != &nft_payload_ops &&
819 track->regs[i].selector->ops != &nft_payload_fast_ops)
822 __nft_reg_track_cancel(track, i);
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,
834 .reduce = nft_payload_set_reduce,
837 static const struct nft_expr_ops *
838 nft_payload_select_ops(const struct nft_ctx *ctx,
839 const struct nlattr * const tb[])
841 enum nft_payload_bases base;
842 unsigned int offset, len;
845 if (tb[NFTA_PAYLOAD_BASE] == NULL ||
846 tb[NFTA_PAYLOAD_OFFSET] == NULL ||
847 tb[NFTA_PAYLOAD_LEN] == NULL)
848 return ERR_PTR(-EINVAL);
850 base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
852 case NFT_PAYLOAD_LL_HEADER:
853 case NFT_PAYLOAD_NETWORK_HEADER:
854 case NFT_PAYLOAD_TRANSPORT_HEADER:
855 case NFT_PAYLOAD_INNER_HEADER:
858 return ERR_PTR(-EOPNOTSUPP);
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;
867 if (tb[NFTA_PAYLOAD_DREG] == NULL)
868 return ERR_PTR(-EINVAL);
870 err = nft_parse_u32_check(tb[NFTA_PAYLOAD_OFFSET], U8_MAX, &offset);
874 err = nft_parse_u32_check(tb[NFTA_PAYLOAD_LEN], U8_MAX, &len);
878 if (len <= 4 && is_power_of_2(len) && IS_ALIGNED(offset, len) &&
879 base != NFT_PAYLOAD_LL_HEADER && base != NFT_PAYLOAD_INNER_HEADER)
880 return &nft_payload_fast_ops;
882 return &nft_payload_ops;
885 struct nft_expr_type nft_payload_type __read_mostly = {
887 .select_ops = nft_payload_select_ops,
888 .policy = nft_payload_policy,
889 .maxattr = NFTA_PAYLOAD_MAX,
890 .owner = THIS_MODULE,