Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 2 | /* |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 3 | * Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net> |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 4 | * Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 5 | * |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 6 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 7 | */ |
| 8 | |
| 9 | #include <linux/kernel.h> |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 10 | #include <linux/if_vlan.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 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> |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 18 | #include <net/netfilter/nf_tables_offload.h> |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 19 | /* For layer 4 checksum field offset. */ |
| 20 | #include <linux/tcp.h> |
| 21 | #include <linux/udp.h> |
Pablo Neira Ayuso | c247897 | 2022-10-17 13:03:29 +0200 | [diff] [blame] | 22 | #include <net/gre.h> |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 23 | #include <linux/icmpv6.h> |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 24 | #include <linux/ip.h> |
| 25 | #include <linux/ipv6.h> |
Davide Caratti | 346e320 | 2020-10-15 18:39:27 +0200 | [diff] [blame] | 26 | #include <net/sctp/checksum.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 27 | |
Pablo Neira Ayuso | 8dfd8b0 | 2019-10-31 15:51:22 +0100 | [diff] [blame] | 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 | |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 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; |
Pablo Neira Ayuso | f41f72d | 2019-10-31 15:51:21 +0100 | [diff] [blame] | 46 | u8 *vlanh, *dst_u8 = (u8 *) d; |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 47 | struct vlan_ethhdr veth; |
| 48 | |
| 49 | vlanh = (u8 *) &veth; |
Pablo Neira Ayuso | aff5c01 | 2024-05-09 23:02:24 +0200 | [diff] [blame] | 50 | if (offset < VLAN_ETH_HLEN) { |
Pablo Neira Ayuso | f41f72d | 2019-10-31 15:51:21 +0100 | [diff] [blame] | 51 | u8 ethlen = len; |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 52 | |
Pablo Neira Ayuso | aff5c01 | 2024-05-09 23:02:24 +0200 | [diff] [blame] | 53 | if (!nft_payload_rebuild_vlan_hdr(skb, mac_off, &veth)) |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 54 | return false; |
| 55 | |
Pablo Neira Ayuso | aff5c01 | 2024-05-09 23:02:24 +0200 | [diff] [blame] | 56 | if (offset + len > VLAN_ETH_HLEN) |
| 57 | ethlen -= offset + len - VLAN_ETH_HLEN; |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 58 | |
Pablo Neira Ayuso | aff5c01 | 2024-05-09 23:02:24 +0200 | [diff] [blame] | 59 | memcpy(dst_u8, vlanh + offset, ethlen); |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 60 | |
| 61 | len -= ethlen; |
| 62 | if (len == 0) |
| 63 | return true; |
| 64 | |
| 65 | dst_u8 += ethlen; |
Pablo Neira Ayuso | aff5c01 | 2024-05-09 23:02:24 +0200 | [diff] [blame] | 66 | offset = ETH_HLEN; |
Pablo Neira Ayuso | f41f72d | 2019-10-31 15:51:21 +0100 | [diff] [blame] | 67 | } else { |
Pablo Neira Ayuso | aff5c01 | 2024-05-09 23:02:24 +0200 | [diff] [blame] | 68 | offset -= VLAN_HLEN; |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 69 | } |
| 70 | |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 71 | return skb_copy_bits(skb, offset + mac_off, dst_u8, len) == 0; |
| 72 | } |
| 73 | |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 74 | static int __nft_payload_inner_offset(struct nft_pktinfo *pkt) |
| 75 | { |
| 76 | unsigned int thoff = nft_thoff(pkt); |
| 77 | |
Florian Westphal | a9e8503 | 2022-01-29 17:13:23 +0100 | [diff] [blame] | 78 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 79 | return -1; |
| 80 | |
| 81 | switch (pkt->tprot) { |
| 82 | case IPPROTO_UDP: |
| 83 | pkt->inneroff = thoff + sizeof(struct udphdr); |
| 84 | break; |
| 85 | case IPPROTO_TCP: { |
| 86 | struct tcphdr *th, _tcph; |
| 87 | |
| 88 | th = skb_header_pointer(pkt->skb, thoff, sizeof(_tcph), &_tcph); |
| 89 | if (!th) |
| 90 | return -1; |
| 91 | |
| 92 | pkt->inneroff = thoff + __tcp_hdrlen(th); |
| 93 | } |
| 94 | break; |
Pablo Neira Ayuso | c247897 | 2022-10-17 13:03:29 +0200 | [diff] [blame] | 95 | case IPPROTO_GRE: { |
Pablo Neira Ayuso | 6639412 | 2022-10-28 10:05:57 +0200 | [diff] [blame] | 96 | u32 offset = sizeof(struct gre_base_hdr); |
Pablo Neira Ayuso | c247897 | 2022-10-17 13:03:29 +0200 | [diff] [blame] | 97 | struct gre_base_hdr *gre, _gre; |
Pablo Neira Ayuso | 6639412 | 2022-10-28 10:05:57 +0200 | [diff] [blame] | 98 | __be16 version; |
Pablo Neira Ayuso | c247897 | 2022-10-17 13:03:29 +0200 | [diff] [blame] | 99 | |
| 100 | gre = skb_header_pointer(pkt->skb, thoff, sizeof(_gre), &_gre); |
| 101 | if (!gre) |
| 102 | return -1; |
| 103 | |
| 104 | version = gre->flags & GRE_VERSION; |
| 105 | switch (version) { |
| 106 | case GRE_VERSION_0: |
| 107 | if (gre->flags & GRE_ROUTING) |
| 108 | return -1; |
| 109 | |
| 110 | if (gre->flags & GRE_CSUM) { |
| 111 | offset += sizeof_field(struct gre_full_hdr, csum) + |
| 112 | sizeof_field(struct gre_full_hdr, reserved1); |
| 113 | } |
| 114 | if (gre->flags & GRE_KEY) |
| 115 | offset += sizeof_field(struct gre_full_hdr, key); |
| 116 | |
| 117 | if (gre->flags & GRE_SEQ) |
| 118 | offset += sizeof_field(struct gre_full_hdr, seq); |
| 119 | break; |
| 120 | default: |
| 121 | return -1; |
| 122 | } |
| 123 | |
| 124 | pkt->inneroff = thoff + offset; |
| 125 | } |
| 126 | break; |
Pablo Neira Ayuso | 3927ce8 | 2022-10-17 13:03:30 +0200 | [diff] [blame] | 127 | case IPPROTO_IPIP: |
| 128 | pkt->inneroff = thoff; |
| 129 | break; |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 130 | default: |
| 131 | return -1; |
| 132 | } |
| 133 | |
| 134 | pkt->flags |= NFT_PKTINFO_INNER; |
| 135 | |
| 136 | return 0; |
| 137 | } |
| 138 | |
Pablo Neira Ayuso | 3a07327 | 2022-10-25 13:48:15 +0200 | [diff] [blame] | 139 | int nft_payload_inner_offset(const struct nft_pktinfo *pkt) |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 140 | { |
| 141 | if (!(pkt->flags & NFT_PKTINFO_INNER) && |
| 142 | __nft_payload_inner_offset((struct nft_pktinfo *)pkt) < 0) |
| 143 | return -1; |
| 144 | |
| 145 | return pkt->inneroff; |
| 146 | } |
| 147 | |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 148 | static bool nft_payload_need_vlan_adjust(u32 offset, u32 len) |
Florian Westphal | af84f9e | 2023-09-29 10:42:10 +0200 | [diff] [blame] | 149 | { |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 150 | unsigned int boundary = offset + len; |
Florian Westphal | af84f9e | 2023-09-29 10:42:10 +0200 | [diff] [blame] | 151 | |
| 152 | /* data past ether src/dst requested, copy needed */ |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 153 | if (boundary > offsetof(struct ethhdr, h_proto)) |
Florian Westphal | af84f9e | 2023-09-29 10:42:10 +0200 | [diff] [blame] | 154 | return true; |
| 155 | |
| 156 | return false; |
| 157 | } |
| 158 | |
Florian Westphal | 10870dd | 2019-01-08 17:35:34 +0100 | [diff] [blame] | 159 | void nft_payload_eval(const struct nft_expr *expr, |
| 160 | struct nft_regs *regs, |
| 161 | const struct nft_pktinfo *pkt) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 162 | { |
| 163 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 164 | const struct sk_buff *skb = pkt->skb; |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 165 | u32 *dest = ®s->data[priv->dreg]; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 166 | int offset; |
| 167 | |
Florian Westphal | 1e105e6 | 2020-08-20 21:05:50 +0200 | [diff] [blame] | 168 | if (priv->len % NFT_REG32_SIZE) |
| 169 | dest[priv->len / NFT_REG32_SIZE] = 0; |
| 170 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 171 | switch (priv->base) { |
| 172 | case NFT_PAYLOAD_LL_HEADER: |
Florian Westphal | d351c1e | 2023-10-08 19:36:53 +0200 | [diff] [blame] | 173 | if (!skb_mac_header_was_set(skb) || skb_mac_header_len(skb) == 0) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 174 | goto err; |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 175 | |
Pablo Neira Ayuso | de6843b | 2023-06-06 09:38:42 +0200 | [diff] [blame] | 176 | if (skb_vlan_tag_present(skb) && |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 177 | nft_payload_need_vlan_adjust(priv->offset, priv->len)) { |
Florian Westphal | 8cfd23e | 2015-08-17 18:09:55 +0200 | [diff] [blame] | 178 | if (!nft_payload_copy_vlan(dest, skb, |
| 179 | priv->offset, priv->len)) |
| 180 | goto err; |
| 181 | return; |
| 182 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 183 | offset = skb_mac_header(skb) - skb->data; |
| 184 | break; |
| 185 | case NFT_PAYLOAD_NETWORK_HEADER: |
| 186 | offset = skb_network_offset(skb); |
| 187 | break; |
| 188 | case NFT_PAYLOAD_TRANSPORT_HEADER: |
Florian Westphal | a9e8503 | 2022-01-29 17:13:23 +0100 | [diff] [blame] | 189 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
Liping Zhang | a20877b | 2016-09-17 14:31:20 +0800 | [diff] [blame] | 190 | goto err; |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 191 | offset = nft_thoff(pkt); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 192 | break; |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 193 | case NFT_PAYLOAD_INNER_HEADER: |
| 194 | offset = nft_payload_inner_offset(pkt); |
| 195 | if (offset < 0) |
| 196 | goto err; |
| 197 | break; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 198 | default: |
Pablo Neira Ayuso | 8801d79 | 2021-12-10 00:09:49 +0100 | [diff] [blame] | 199 | WARN_ON_ONCE(1); |
| 200 | goto err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 201 | } |
| 202 | offset += priv->offset; |
| 203 | |
Patrick McHardy | fad136e | 2015-04-11 02:27:33 +0100 | [diff] [blame] | 204 | if (skb_copy_bits(skb, offset, dest, priv->len) < 0) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 205 | goto err; |
| 206 | return; |
| 207 | err: |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 208 | regs->verdict.code = NFT_BREAK; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 209 | } |
| 210 | |
| 211 | static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = { |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 212 | [NFTA_PAYLOAD_SREG] = { .type = NLA_U32 }, |
| 213 | [NFTA_PAYLOAD_DREG] = { .type = NLA_U32 }, |
| 214 | [NFTA_PAYLOAD_BASE] = { .type = NLA_U32 }, |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 215 | [NFTA_PAYLOAD_OFFSET] = NLA_POLICY_MAX(NLA_BE32, 255), |
| 216 | [NFTA_PAYLOAD_LEN] = NLA_POLICY_MAX(NLA_BE32, 255), |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 217 | [NFTA_PAYLOAD_CSUM_TYPE] = { .type = NLA_U32 }, |
Florian Westphal | ecaf75f | 2022-10-31 13:34:07 +0100 | [diff] [blame] | 218 | [NFTA_PAYLOAD_CSUM_OFFSET] = NLA_POLICY_MAX(NLA_BE32, 255), |
Jakub Kicinski | 9d6effb | 2020-03-02 21:08:32 -0800 | [diff] [blame] | 219 | [NFTA_PAYLOAD_CSUM_FLAGS] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 220 | }; |
| 221 | |
| 222 | static int nft_payload_init(const struct nft_ctx *ctx, |
| 223 | const struct nft_expr *expr, |
| 224 | const struct nlattr * const tb[]) |
| 225 | { |
| 226 | struct nft_payload *priv = nft_expr_priv(expr); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 227 | |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 228 | priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 229 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); |
| 230 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 231 | |
Pablo Neira Ayuso | 345023b | 2021-01-25 18:27:22 +0100 | [diff] [blame] | 232 | return nft_parse_register_store(ctx, tb[NFTA_PAYLOAD_DREG], |
| 233 | &priv->dreg, NULL, NFT_DATA_VALUE, |
| 234 | priv->len); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 235 | } |
| 236 | |
Phil Sutter | 7d34aa3 | 2022-10-14 23:45:58 +0200 | [diff] [blame] | 237 | static int nft_payload_dump(struct sk_buff *skb, |
| 238 | const struct nft_expr *expr, bool reset) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 239 | { |
| 240 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 241 | |
Patrick McHardy | b1c96ed | 2015-04-11 02:27:36 +0100 | [diff] [blame] | 242 | if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) || |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 243 | nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || |
| 244 | nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || |
| 245 | nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len))) |
| 246 | goto nla_put_failure; |
| 247 | return 0; |
| 248 | |
| 249 | nla_put_failure: |
| 250 | return -1; |
| 251 | } |
| 252 | |
Pablo Neira Ayuso | a7c176b | 2022-01-09 17:11:22 +0100 | [diff] [blame] | 253 | static bool nft_payload_reduce(struct nft_regs_track *track, |
| 254 | const struct nft_expr *expr) |
| 255 | { |
| 256 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 257 | const struct nft_payload *payload; |
| 258 | |
Pablo Neira Ayuso | 34cc9e5 | 2022-03-14 18:23:01 +0100 | [diff] [blame] | 259 | if (!nft_reg_track_cmp(track, expr, priv->dreg)) { |
| 260 | nft_reg_track_update(track, expr, priv->dreg, priv->len); |
Pablo Neira Ayuso | a7c176b | 2022-01-09 17:11:22 +0100 | [diff] [blame] | 261 | return false; |
| 262 | } |
| 263 | |
| 264 | payload = nft_expr_priv(track->regs[priv->dreg].selector); |
| 265 | if (priv->base != payload->base || |
| 266 | priv->offset != payload->offset || |
| 267 | priv->len != payload->len) { |
Pablo Neira Ayuso | 34cc9e5 | 2022-03-14 18:23:01 +0100 | [diff] [blame] | 268 | nft_reg_track_update(track, expr, priv->dreg, priv->len); |
Pablo Neira Ayuso | a7c176b | 2022-01-09 17:11:22 +0100 | [diff] [blame] | 269 | return false; |
| 270 | } |
| 271 | |
| 272 | if (!track->regs[priv->dreg].bitwise) |
| 273 | return true; |
| 274 | |
Pablo Neira Ayuso | be5650f | 2022-01-09 17:11:24 +0100 | [diff] [blame] | 275 | return nft_expr_reduce_bitwise(track, expr); |
Pablo Neira Ayuso | a7c176b | 2022-01-09 17:11:22 +0100 | [diff] [blame] | 276 | } |
| 277 | |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 278 | static bool nft_payload_offload_mask(struct nft_offload_reg *reg, |
| 279 | u32 priv_len, u32 field_len) |
| 280 | { |
| 281 | unsigned int remainder, delta, k; |
| 282 | struct nft_data mask = {}; |
| 283 | __be32 remainder_mask; |
| 284 | |
| 285 | if (priv_len == field_len) { |
| 286 | memset(®->mask, 0xff, priv_len); |
| 287 | return true; |
| 288 | } else if (priv_len > field_len) { |
| 289 | return false; |
| 290 | } |
| 291 | |
| 292 | memset(&mask, 0xff, field_len); |
| 293 | remainder = priv_len % sizeof(u32); |
| 294 | if (remainder) { |
| 295 | k = priv_len / sizeof(u32); |
| 296 | delta = field_len - priv_len; |
| 297 | remainder_mask = htonl(~((1 << (delta * BITS_PER_BYTE)) - 1)); |
| 298 | mask.data[k] = (__force u32)remainder_mask; |
| 299 | } |
| 300 | |
| 301 | memcpy(®->mask, &mask, field_len); |
| 302 | |
| 303 | return true; |
| 304 | } |
| 305 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 306 | static int nft_payload_offload_ll(struct nft_offload_ctx *ctx, |
| 307 | struct nft_flow_rule *flow, |
| 308 | const struct nft_payload *priv) |
| 309 | { |
| 310 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; |
| 311 | |
| 312 | switch (priv->offset) { |
| 313 | case offsetof(struct ethhdr, h_source): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 314 | if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN)) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 315 | return -EOPNOTSUPP; |
| 316 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 317 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs, |
| 318 | src, ETH_ALEN, reg); |
| 319 | break; |
| 320 | case offsetof(struct ethhdr, h_dest): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 321 | if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN)) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 322 | return -EOPNOTSUPP; |
| 323 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 324 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs, |
| 325 | dst, ETH_ALEN, reg); |
| 326 | break; |
Pablo Neira Ayuso | a82055a | 2019-11-19 23:05:54 +0100 | [diff] [blame] | 327 | case offsetof(struct ethhdr, h_proto): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 328 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
Pablo Neira Ayuso | a82055a | 2019-11-19 23:05:54 +0100 | [diff] [blame] | 329 | return -EOPNOTSUPP; |
| 330 | |
| 331 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, |
| 332 | n_proto, sizeof(__be16), reg); |
| 333 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
| 334 | break; |
| 335 | case offsetof(struct vlan_ethhdr, h_vlan_TCI): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 336 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
Pablo Neira Ayuso | a82055a | 2019-11-19 23:05:54 +0100 | [diff] [blame] | 337 | return -EOPNOTSUPP; |
| 338 | |
Pablo Neira Ayuso | ff4d90a | 2021-04-12 14:20:15 +0200 | [diff] [blame] | 339 | NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_VLAN, vlan, |
| 340 | vlan_tci, sizeof(__be16), reg, |
| 341 | NFT_OFFLOAD_F_NETWORK2HOST); |
Pablo Neira Ayuso | a82055a | 2019-11-19 23:05:54 +0100 | [diff] [blame] | 342 | break; |
| 343 | case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 344 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
Pablo Neira Ayuso | a82055a | 2019-11-19 23:05:54 +0100 | [diff] [blame] | 345 | return -EOPNOTSUPP; |
| 346 | |
| 347 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan, |
| 348 | vlan_tpid, sizeof(__be16), reg); |
Pablo Neira Ayuso | 89d8fd4 | 2019-11-19 23:05:55 +0100 | [diff] [blame] | 349 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
| 350 | break; |
| 351 | case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 352 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
Pablo Neira Ayuso | 89d8fd4 | 2019-11-19 23:05:55 +0100 | [diff] [blame] | 353 | return -EOPNOTSUPP; |
| 354 | |
Pablo Neira Ayuso | ff4d90a | 2021-04-12 14:20:15 +0200 | [diff] [blame] | 355 | NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_CVLAN, cvlan, |
| 356 | vlan_tci, sizeof(__be16), reg, |
| 357 | NFT_OFFLOAD_F_NETWORK2HOST); |
Pablo Neira Ayuso | 89d8fd4 | 2019-11-19 23:05:55 +0100 | [diff] [blame] | 358 | break; |
| 359 | case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto) + |
| 360 | sizeof(struct vlan_hdr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 361 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
Pablo Neira Ayuso | 89d8fd4 | 2019-11-19 23:05:55 +0100 | [diff] [blame] | 362 | return -EOPNOTSUPP; |
| 363 | |
Pablo Neira Ayuso | 14c2064 | 2021-04-12 14:11:39 +0200 | [diff] [blame] | 364 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, cvlan, |
Pablo Neira Ayuso | 89d8fd4 | 2019-11-19 23:05:55 +0100 | [diff] [blame] | 365 | vlan_tpid, sizeof(__be16), reg); |
Pablo Neira Ayuso | 14c2064 | 2021-04-12 14:11:39 +0200 | [diff] [blame] | 366 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK); |
Pablo Neira Ayuso | a82055a | 2019-11-19 23:05:54 +0100 | [diff] [blame] | 367 | break; |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 368 | default: |
| 369 | return -EOPNOTSUPP; |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 370 | } |
| 371 | |
| 372 | return 0; |
| 373 | } |
| 374 | |
| 375 | static int nft_payload_offload_ip(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 iphdr, saddr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 383 | if (!nft_payload_offload_mask(reg, priv->len, |
| 384 | sizeof(struct in_addr))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 385 | return -EOPNOTSUPP; |
| 386 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 387 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, src, |
| 388 | sizeof(struct in_addr), reg); |
Pablo Neira Ayuso | 3c78e9e | 2020-11-25 23:50:07 +0100 | [diff] [blame] | 389 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS); |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 390 | break; |
| 391 | case offsetof(struct iphdr, daddr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 392 | if (!nft_payload_offload_mask(reg, priv->len, |
| 393 | sizeof(struct in_addr))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 394 | return -EOPNOTSUPP; |
| 395 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 396 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, dst, |
| 397 | sizeof(struct in_addr), reg); |
Pablo Neira Ayuso | 3c78e9e | 2020-11-25 23:50:07 +0100 | [diff] [blame] | 398 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS); |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 399 | break; |
| 400 | case offsetof(struct iphdr, protocol): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 401 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 402 | return -EOPNOTSUPP; |
| 403 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 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_ip6(struct nft_offload_ctx *ctx, |
| 416 | struct nft_flow_rule *flow, |
| 417 | const struct nft_payload *priv) |
| 418 | { |
| 419 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; |
| 420 | |
| 421 | switch (priv->offset) { |
| 422 | case offsetof(struct ipv6hdr, saddr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 423 | if (!nft_payload_offload_mask(reg, priv->len, |
| 424 | sizeof(struct in6_addr))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 425 | return -EOPNOTSUPP; |
| 426 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 427 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, src, |
| 428 | sizeof(struct in6_addr), reg); |
Pablo Neira Ayuso | 3c78e9e | 2020-11-25 23:50:07 +0100 | [diff] [blame] | 429 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS); |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 430 | break; |
| 431 | case offsetof(struct ipv6hdr, daddr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 432 | if (!nft_payload_offload_mask(reg, priv->len, |
| 433 | sizeof(struct in6_addr))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 434 | return -EOPNOTSUPP; |
| 435 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 436 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, dst, |
| 437 | sizeof(struct in6_addr), reg); |
Pablo Neira Ayuso | 3c78e9e | 2020-11-25 23:50:07 +0100 | [diff] [blame] | 438 | nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS); |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 439 | break; |
| 440 | case offsetof(struct ipv6hdr, nexthdr): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 441 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 442 | return -EOPNOTSUPP; |
| 443 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 444 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto, |
| 445 | sizeof(__u8), reg); |
| 446 | nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT); |
| 447 | break; |
| 448 | default: |
| 449 | return -EOPNOTSUPP; |
| 450 | } |
| 451 | |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | static int nft_payload_offload_nh(struct nft_offload_ctx *ctx, |
| 456 | struct nft_flow_rule *flow, |
| 457 | const struct nft_payload *priv) |
| 458 | { |
| 459 | int err; |
| 460 | |
| 461 | switch (ctx->dep.l3num) { |
| 462 | case htons(ETH_P_IP): |
| 463 | err = nft_payload_offload_ip(ctx, flow, priv); |
| 464 | break; |
| 465 | case htons(ETH_P_IPV6): |
| 466 | err = nft_payload_offload_ip6(ctx, flow, priv); |
| 467 | break; |
| 468 | default: |
| 469 | return -EOPNOTSUPP; |
| 470 | } |
| 471 | |
| 472 | return err; |
| 473 | } |
| 474 | |
| 475 | static int nft_payload_offload_tcp(struct nft_offload_ctx *ctx, |
| 476 | struct nft_flow_rule *flow, |
| 477 | const struct nft_payload *priv) |
| 478 | { |
| 479 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; |
| 480 | |
| 481 | switch (priv->offset) { |
| 482 | case offsetof(struct tcphdr, source): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 483 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 484 | return -EOPNOTSUPP; |
| 485 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 486 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src, |
| 487 | sizeof(__be16), reg); |
| 488 | break; |
| 489 | case offsetof(struct tcphdr, dest): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 490 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 491 | return -EOPNOTSUPP; |
| 492 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 493 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst, |
| 494 | sizeof(__be16), reg); |
| 495 | break; |
| 496 | default: |
| 497 | return -EOPNOTSUPP; |
| 498 | } |
| 499 | |
| 500 | return 0; |
| 501 | } |
| 502 | |
| 503 | static int nft_payload_offload_udp(struct nft_offload_ctx *ctx, |
| 504 | struct nft_flow_rule *flow, |
| 505 | const struct nft_payload *priv) |
| 506 | { |
| 507 | struct nft_offload_reg *reg = &ctx->regs[priv->dreg]; |
| 508 | |
| 509 | switch (priv->offset) { |
| 510 | case offsetof(struct udphdr, source): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 511 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 512 | return -EOPNOTSUPP; |
| 513 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 514 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src, |
| 515 | sizeof(__be16), reg); |
| 516 | break; |
| 517 | case offsetof(struct udphdr, dest): |
Pablo Neira Ayuso | a5d45bc | 2020-11-25 23:50:17 +0100 | [diff] [blame] | 518 | if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16))) |
wenxu | a69a85da | 2019-10-24 15:52:45 +0800 | [diff] [blame] | 519 | return -EOPNOTSUPP; |
| 520 | |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 521 | NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst, |
| 522 | sizeof(__be16), reg); |
| 523 | break; |
| 524 | default: |
| 525 | return -EOPNOTSUPP; |
| 526 | } |
| 527 | |
| 528 | return 0; |
| 529 | } |
| 530 | |
| 531 | static int nft_payload_offload_th(struct nft_offload_ctx *ctx, |
| 532 | struct nft_flow_rule *flow, |
| 533 | const struct nft_payload *priv) |
| 534 | { |
| 535 | int err; |
| 536 | |
| 537 | switch (ctx->dep.protonum) { |
| 538 | case IPPROTO_TCP: |
| 539 | err = nft_payload_offload_tcp(ctx, flow, priv); |
| 540 | break; |
| 541 | case IPPROTO_UDP: |
| 542 | err = nft_payload_offload_udp(ctx, flow, priv); |
| 543 | break; |
| 544 | default: |
| 545 | return -EOPNOTSUPP; |
| 546 | } |
| 547 | |
| 548 | return err; |
| 549 | } |
| 550 | |
| 551 | static int nft_payload_offload(struct nft_offload_ctx *ctx, |
| 552 | struct nft_flow_rule *flow, |
| 553 | const struct nft_expr *expr) |
| 554 | { |
| 555 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 556 | int err; |
| 557 | |
| 558 | switch (priv->base) { |
| 559 | case NFT_PAYLOAD_LL_HEADER: |
| 560 | err = nft_payload_offload_ll(ctx, flow, priv); |
| 561 | break; |
| 562 | case NFT_PAYLOAD_NETWORK_HEADER: |
| 563 | err = nft_payload_offload_nh(ctx, flow, priv); |
| 564 | break; |
| 565 | case NFT_PAYLOAD_TRANSPORT_HEADER: |
| 566 | err = nft_payload_offload_th(ctx, flow, priv); |
| 567 | break; |
| 568 | default: |
| 569 | err = -EOPNOTSUPP; |
| 570 | break; |
| 571 | } |
| 572 | return err; |
| 573 | } |
| 574 | |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 575 | static const struct nft_expr_ops nft_payload_ops = { |
| 576 | .type = &nft_payload_type, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 577 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 578 | .eval = nft_payload_eval, |
| 579 | .init = nft_payload_init, |
| 580 | .dump = nft_payload_dump, |
Pablo Neira Ayuso | a7c176b | 2022-01-09 17:11:22 +0100 | [diff] [blame] | 581 | .reduce = nft_payload_reduce, |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 582 | .offload = nft_payload_offload, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 583 | }; |
| 584 | |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 585 | const struct nft_expr_ops nft_payload_fast_ops = { |
| 586 | .type = &nft_payload_type, |
| 587 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), |
| 588 | .eval = nft_payload_eval, |
| 589 | .init = nft_payload_init, |
| 590 | .dump = nft_payload_dump, |
Pablo Neira Ayuso | a7c176b | 2022-01-09 17:11:22 +0100 | [diff] [blame] | 591 | .reduce = nft_payload_reduce, |
Pablo Neira Ayuso | c9626a2 | 2019-07-09 23:00:43 +0200 | [diff] [blame] | 592 | .offload = nft_payload_offload, |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 593 | }; |
| 594 | |
Pablo Neira Ayuso | 3a07327 | 2022-10-25 13:48:15 +0200 | [diff] [blame] | 595 | void nft_payload_inner_eval(const struct nft_expr *expr, struct nft_regs *regs, |
| 596 | const struct nft_pktinfo *pkt, |
| 597 | struct nft_inner_tun_ctx *tun_ctx) |
| 598 | { |
| 599 | const struct nft_payload *priv = nft_expr_priv(expr); |
| 600 | const struct sk_buff *skb = pkt->skb; |
| 601 | u32 *dest = ®s->data[priv->dreg]; |
| 602 | int offset; |
| 603 | |
| 604 | if (priv->len % NFT_REG32_SIZE) |
| 605 | dest[priv->len / NFT_REG32_SIZE] = 0; |
| 606 | |
| 607 | switch (priv->base) { |
| 608 | case NFT_PAYLOAD_TUN_HEADER: |
| 609 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_TUN)) |
| 610 | goto err; |
| 611 | |
| 612 | offset = tun_ctx->inner_tunoff; |
| 613 | break; |
| 614 | case NFT_PAYLOAD_LL_HEADER: |
| 615 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_LL)) |
| 616 | goto err; |
| 617 | |
| 618 | offset = tun_ctx->inner_lloff; |
| 619 | break; |
| 620 | case NFT_PAYLOAD_NETWORK_HEADER: |
| 621 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_NH)) |
| 622 | goto err; |
| 623 | |
| 624 | offset = tun_ctx->inner_nhoff; |
| 625 | break; |
| 626 | case NFT_PAYLOAD_TRANSPORT_HEADER: |
| 627 | if (!(tun_ctx->flags & NFT_PAYLOAD_CTX_INNER_TH)) |
| 628 | goto err; |
| 629 | |
| 630 | offset = tun_ctx->inner_thoff; |
| 631 | break; |
| 632 | default: |
| 633 | WARN_ON_ONCE(1); |
| 634 | goto err; |
| 635 | } |
| 636 | offset += priv->offset; |
| 637 | |
| 638 | if (skb_copy_bits(skb, offset, dest, priv->len) < 0) |
| 639 | goto err; |
| 640 | |
| 641 | return; |
| 642 | err: |
| 643 | regs->verdict.code = NFT_BREAK; |
| 644 | } |
| 645 | |
| 646 | static int nft_payload_inner_init(const struct nft_ctx *ctx, |
| 647 | const struct nft_expr *expr, |
| 648 | const struct nlattr * const tb[]) |
| 649 | { |
| 650 | struct nft_payload *priv = nft_expr_priv(expr); |
| 651 | u32 base; |
| 652 | |
Davide Ornaghi | c4ab9da | 2024-06-05 13:03:45 +0200 | [diff] [blame] | 653 | if (!tb[NFTA_PAYLOAD_BASE] || !tb[NFTA_PAYLOAD_OFFSET] || |
| 654 | !tb[NFTA_PAYLOAD_LEN] || !tb[NFTA_PAYLOAD_DREG]) |
| 655 | return -EINVAL; |
| 656 | |
Pablo Neira Ayuso | 3a07327 | 2022-10-25 13:48:15 +0200 | [diff] [blame] | 657 | base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); |
| 658 | switch (base) { |
| 659 | case NFT_PAYLOAD_TUN_HEADER: |
| 660 | case NFT_PAYLOAD_LL_HEADER: |
| 661 | case NFT_PAYLOAD_NETWORK_HEADER: |
| 662 | case NFT_PAYLOAD_TRANSPORT_HEADER: |
| 663 | break; |
| 664 | default: |
| 665 | return -EOPNOTSUPP; |
| 666 | } |
| 667 | |
| 668 | priv->base = base; |
| 669 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); |
| 670 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); |
| 671 | |
| 672 | return nft_parse_register_store(ctx, tb[NFTA_PAYLOAD_DREG], |
| 673 | &priv->dreg, NULL, NFT_DATA_VALUE, |
| 674 | priv->len); |
| 675 | } |
| 676 | |
| 677 | static const struct nft_expr_ops nft_payload_inner_ops = { |
| 678 | .type = &nft_payload_type, |
| 679 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload)), |
| 680 | .init = nft_payload_inner_init, |
| 681 | .dump = nft_payload_dump, |
| 682 | /* direct call to nft_payload_inner_eval(). */ |
| 683 | }; |
| 684 | |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 685 | static inline void nft_csum_replace(__sum16 *sum, __wsum fsum, __wsum tsum) |
| 686 | { |
| 687 | *sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), fsum), tsum)); |
| 688 | if (*sum == 0) |
| 689 | *sum = CSUM_MANGLED_0; |
| 690 | } |
| 691 | |
| 692 | static bool nft_payload_udp_checksum(struct sk_buff *skb, unsigned int thoff) |
| 693 | { |
| 694 | struct udphdr *uh, _uh; |
| 695 | |
| 696 | uh = skb_header_pointer(skb, thoff, sizeof(_uh), &_uh); |
| 697 | if (!uh) |
| 698 | return false; |
| 699 | |
Florian Westphal | 5fd02eb | 2017-08-21 16:19:26 +0200 | [diff] [blame] | 700 | return (__force bool)uh->check; |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 701 | } |
| 702 | |
| 703 | static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt, |
| 704 | struct sk_buff *skb, |
| 705 | unsigned int *l4csum_offset) |
| 706 | { |
Pablo Neira Ayuso | 4e1860a | 2022-01-05 16:09:57 +0100 | [diff] [blame] | 707 | if (pkt->fragoff) |
| 708 | return -1; |
| 709 | |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 710 | switch (pkt->tprot) { |
| 711 | case IPPROTO_TCP: |
| 712 | *l4csum_offset = offsetof(struct tcphdr, check); |
| 713 | break; |
| 714 | case IPPROTO_UDP: |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 715 | if (!nft_payload_udp_checksum(skb, nft_thoff(pkt))) |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 716 | return -1; |
Gustavo A. R. Silva | 954d829 | 2020-07-08 15:09:39 -0500 | [diff] [blame] | 717 | fallthrough; |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 718 | case IPPROTO_UDPLITE: |
| 719 | *l4csum_offset = offsetof(struct udphdr, check); |
| 720 | break; |
| 721 | case IPPROTO_ICMPV6: |
| 722 | *l4csum_offset = offsetof(struct icmp6hdr, icmp6_cksum); |
| 723 | break; |
| 724 | default: |
| 725 | return -1; |
| 726 | } |
| 727 | |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 728 | *l4csum_offset += nft_thoff(pkt); |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 729 | return 0; |
| 730 | } |
| 731 | |
Davide Caratti | 346e320 | 2020-10-15 18:39:27 +0200 | [diff] [blame] | 732 | static int nft_payload_csum_sctp(struct sk_buff *skb, int offset) |
| 733 | { |
| 734 | struct sctphdr *sh; |
| 735 | |
| 736 | if (skb_ensure_writable(skb, offset + sizeof(*sh))) |
| 737 | return -1; |
| 738 | |
| 739 | sh = (struct sctphdr *)(skb->data + offset); |
| 740 | sh->checksum = sctp_compute_cksum(skb, offset); |
| 741 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 742 | return 0; |
| 743 | } |
| 744 | |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 745 | static int nft_payload_l4csum_update(const struct nft_pktinfo *pkt, |
| 746 | struct sk_buff *skb, |
| 747 | __wsum fsum, __wsum tsum) |
| 748 | { |
| 749 | int l4csum_offset; |
| 750 | __sum16 sum; |
| 751 | |
| 752 | /* If we cannot determine layer 4 checksum offset or this packet doesn't |
| 753 | * require layer 4 checksum recalculation, skip this packet. |
| 754 | */ |
| 755 | if (nft_payload_l4csum_offset(pkt, skb, &l4csum_offset) < 0) |
| 756 | return 0; |
| 757 | |
| 758 | if (skb_copy_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0) |
| 759 | return -1; |
| 760 | |
| 761 | /* Checksum mangling for an arbitrary amount of bytes, based on |
| 762 | * inet_proto_csum_replace*() functions. |
| 763 | */ |
| 764 | if (skb->ip_summed != CHECKSUM_PARTIAL) { |
| 765 | nft_csum_replace(&sum, fsum, tsum); |
| 766 | if (skb->ip_summed == CHECKSUM_COMPLETE) { |
| 767 | skb->csum = ~csum_add(csum_sub(~(skb->csum), fsum), |
| 768 | tsum); |
| 769 | } |
| 770 | } else { |
| 771 | sum = ~csum_fold(csum_add(csum_sub(csum_unfold(sum), fsum), |
| 772 | tsum)); |
| 773 | } |
| 774 | |
Florian Westphal | 7418ee4 | 2019-05-23 15:44:09 +0200 | [diff] [blame] | 775 | if (skb_ensure_writable(skb, l4csum_offset + sizeof(sum)) || |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 776 | skb_store_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0) |
| 777 | return -1; |
| 778 | |
| 779 | return 0; |
| 780 | } |
| 781 | |
Pablo Neira Ayuso | 053d20f | 2016-12-14 12:15:49 +0100 | [diff] [blame] | 782 | static int nft_payload_csum_inet(struct sk_buff *skb, const u32 *src, |
| 783 | __wsum fsum, __wsum tsum, int csum_offset) |
| 784 | { |
| 785 | __sum16 sum; |
| 786 | |
| 787 | if (skb_copy_bits(skb, csum_offset, &sum, sizeof(sum)) < 0) |
| 788 | return -1; |
| 789 | |
| 790 | nft_csum_replace(&sum, fsum, tsum); |
Florian Westphal | 7418ee4 | 2019-05-23 15:44:09 +0200 | [diff] [blame] | 791 | if (skb_ensure_writable(skb, csum_offset + sizeof(sum)) || |
Pablo Neira Ayuso | 053d20f | 2016-12-14 12:15:49 +0100 | [diff] [blame] | 792 | skb_store_bits(skb, csum_offset, &sum, sizeof(sum)) < 0) |
| 793 | return -1; |
| 794 | |
| 795 | return 0; |
| 796 | } |
| 797 | |
Pablo Neira Ayuso | ac1f8c0 | 2022-09-28 23:55:06 +0200 | [diff] [blame] | 798 | struct nft_payload_set { |
| 799 | enum nft_payload_bases base:8; |
| 800 | u8 offset; |
| 801 | u8 len; |
| 802 | u8 sreg; |
| 803 | u8 csum_type; |
| 804 | u8 csum_offset; |
| 805 | u8 csum_flags; |
| 806 | }; |
| 807 | |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 808 | /* This is not struct vlan_hdr. */ |
| 809 | struct nft_payload_vlan_hdr { |
| 810 | __be16 h_vlan_proto; |
| 811 | __be16 h_vlan_TCI; |
| 812 | }; |
| 813 | |
| 814 | static bool |
| 815 | nft_payload_set_vlan(const u32 *src, struct sk_buff *skb, u8 offset, u8 len, |
| 816 | int *vlan_hlen) |
| 817 | { |
| 818 | struct nft_payload_vlan_hdr *vlanh; |
| 819 | __be16 vlan_proto; |
| 820 | u16 vlan_tci; |
| 821 | |
| 822 | if (offset >= offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto)) { |
| 823 | *vlan_hlen = VLAN_HLEN; |
| 824 | return true; |
| 825 | } |
| 826 | |
| 827 | switch (offset) { |
| 828 | case offsetof(struct vlan_ethhdr, h_vlan_proto): |
| 829 | if (len == 2) { |
| 830 | vlan_proto = nft_reg_load_be16(src); |
| 831 | skb->vlan_proto = vlan_proto; |
| 832 | } else if (len == 4) { |
| 833 | vlanh = (struct nft_payload_vlan_hdr *)src; |
| 834 | __vlan_hwaccel_put_tag(skb, vlanh->h_vlan_proto, |
| 835 | ntohs(vlanh->h_vlan_TCI)); |
| 836 | } else { |
| 837 | return false; |
| 838 | } |
| 839 | break; |
| 840 | case offsetof(struct vlan_ethhdr, h_vlan_TCI): |
| 841 | if (len != 2) |
| 842 | return false; |
| 843 | |
| 844 | vlan_tci = ntohs(nft_reg_load_be16(src)); |
| 845 | skb->vlan_tci = vlan_tci; |
| 846 | break; |
| 847 | default: |
| 848 | return false; |
| 849 | } |
| 850 | |
| 851 | return true; |
| 852 | } |
| 853 | |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 854 | static void nft_payload_set_eval(const struct nft_expr *expr, |
| 855 | struct nft_regs *regs, |
| 856 | const struct nft_pktinfo *pkt) |
| 857 | { |
| 858 | const struct nft_payload_set *priv = nft_expr_priv(expr); |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 859 | const u32 *src = ®s->data[priv->sreg]; |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 860 | int offset, csum_offset, vlan_hlen = 0; |
| 861 | struct sk_buff *skb = pkt->skb; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 862 | __wsum fsum, tsum; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 863 | |
| 864 | switch (priv->base) { |
| 865 | case NFT_PAYLOAD_LL_HEADER: |
| 866 | if (!skb_mac_header_was_set(skb)) |
| 867 | goto err; |
Pablo Neira Ayuso | 33c563e | 2024-05-08 22:50:34 +0200 | [diff] [blame] | 868 | |
| 869 | if (skb_vlan_tag_present(skb) && |
| 870 | nft_payload_need_vlan_adjust(priv->offset, priv->len)) { |
| 871 | if (!nft_payload_set_vlan(src, skb, |
| 872 | priv->offset, priv->len, |
| 873 | &vlan_hlen)) |
| 874 | goto err; |
| 875 | |
| 876 | if (!vlan_hlen) |
| 877 | return; |
| 878 | } |
| 879 | |
| 880 | offset = skb_mac_header(skb) - skb->data - vlan_hlen; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 881 | break; |
| 882 | case NFT_PAYLOAD_NETWORK_HEADER: |
| 883 | offset = skb_network_offset(skb); |
| 884 | break; |
| 885 | case NFT_PAYLOAD_TRANSPORT_HEADER: |
Florian Westphal | a9e8503 | 2022-01-29 17:13:23 +0100 | [diff] [blame] | 886 | if (!(pkt->flags & NFT_PKTINFO_L4PROTO) || pkt->fragoff) |
Liping Zhang | a20877b | 2016-09-17 14:31:20 +0800 | [diff] [blame] | 887 | goto err; |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 888 | offset = nft_thoff(pkt); |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 889 | break; |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 890 | case NFT_PAYLOAD_INNER_HEADER: |
| 891 | offset = nft_payload_inner_offset(pkt); |
| 892 | if (offset < 0) |
| 893 | goto err; |
| 894 | break; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 895 | default: |
Pablo Neira Ayuso | 8801d79 | 2021-12-10 00:09:49 +0100 | [diff] [blame] | 896 | WARN_ON_ONCE(1); |
| 897 | goto err; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 898 | } |
| 899 | |
| 900 | csum_offset = offset + priv->csum_offset; |
| 901 | offset += priv->offset; |
| 902 | |
Pablo Neira Ayuso | 053d20f | 2016-12-14 12:15:49 +0100 | [diff] [blame] | 903 | if ((priv->csum_type == NFT_PAYLOAD_CSUM_INET || priv->csum_flags) && |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 904 | ((priv->base != NFT_PAYLOAD_TRANSPORT_HEADER && |
| 905 | priv->base != NFT_PAYLOAD_INNER_HEADER) || |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 906 | skb->ip_summed != CHECKSUM_PARTIAL)) { |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 907 | fsum = skb_checksum(skb, offset, priv->len, 0); |
| 908 | tsum = csum_partial(src, priv->len, 0); |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 909 | |
Pablo Neira Ayuso | 053d20f | 2016-12-14 12:15:49 +0100 | [diff] [blame] | 910 | if (priv->csum_type == NFT_PAYLOAD_CSUM_INET && |
| 911 | nft_payload_csum_inet(skb, src, fsum, tsum, csum_offset)) |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 912 | goto err; |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 913 | |
| 914 | if (priv->csum_flags && |
| 915 | nft_payload_l4csum_update(pkt, skb, fsum, tsum) < 0) |
| 916 | goto err; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 917 | } |
| 918 | |
Florian Westphal | 7418ee4 | 2019-05-23 15:44:09 +0200 | [diff] [blame] | 919 | if (skb_ensure_writable(skb, max(offset + priv->len, 0)) || |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 920 | skb_store_bits(skb, offset, src, priv->len) < 0) |
| 921 | goto err; |
| 922 | |
Davide Caratti | 346e320 | 2020-10-15 18:39:27 +0200 | [diff] [blame] | 923 | if (priv->csum_type == NFT_PAYLOAD_CSUM_SCTP && |
| 924 | pkt->tprot == IPPROTO_SCTP && |
| 925 | skb->ip_summed != CHECKSUM_PARTIAL) { |
Florian Westphal | a9e8503 | 2022-01-29 17:13:23 +0100 | [diff] [blame] | 926 | if (pkt->fragoff == 0 && |
| 927 | nft_payload_csum_sctp(skb, nft_thoff(pkt))) |
Davide Caratti | 346e320 | 2020-10-15 18:39:27 +0200 | [diff] [blame] | 928 | goto err; |
| 929 | } |
| 930 | |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 931 | return; |
| 932 | err: |
| 933 | regs->verdict.code = NFT_BREAK; |
| 934 | } |
| 935 | |
| 936 | static int nft_payload_set_init(const struct nft_ctx *ctx, |
| 937 | const struct nft_expr *expr, |
| 938 | const struct nlattr * const tb[]) |
| 939 | { |
| 940 | struct nft_payload_set *priv = nft_expr_priv(expr); |
Pablo Neira Ayuso | 7044ab2 | 2022-08-21 11:55:19 +0200 | [diff] [blame] | 941 | u32 csum_offset, csum_type = NFT_PAYLOAD_CSUM_NONE; |
| 942 | int err; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 943 | |
| 944 | priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); |
| 945 | priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET])); |
| 946 | priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN])); |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 947 | |
| 948 | if (tb[NFTA_PAYLOAD_CSUM_TYPE]) |
Pablo Neira Ayuso | 7044ab2 | 2022-08-21 11:55:19 +0200 | [diff] [blame] | 949 | csum_type = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_TYPE])); |
| 950 | if (tb[NFTA_PAYLOAD_CSUM_OFFSET]) { |
| 951 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_CSUM_OFFSET], U8_MAX, |
| 952 | &csum_offset); |
| 953 | if (err < 0) |
| 954 | return err; |
| 955 | |
| 956 | priv->csum_offset = csum_offset; |
| 957 | } |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 958 | if (tb[NFTA_PAYLOAD_CSUM_FLAGS]) { |
| 959 | u32 flags; |
| 960 | |
| 961 | flags = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_FLAGS])); |
| 962 | if (flags & ~NFT_PAYLOAD_L4CSUM_PSEUDOHDR) |
| 963 | return -EINVAL; |
| 964 | |
| 965 | priv->csum_flags = flags; |
| 966 | } |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 967 | |
Pablo Neira Ayuso | 7044ab2 | 2022-08-21 11:55:19 +0200 | [diff] [blame] | 968 | switch (csum_type) { |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 969 | case NFT_PAYLOAD_CSUM_NONE: |
| 970 | case NFT_PAYLOAD_CSUM_INET: |
| 971 | break; |
Davide Caratti | 346e320 | 2020-10-15 18:39:27 +0200 | [diff] [blame] | 972 | case NFT_PAYLOAD_CSUM_SCTP: |
| 973 | if (priv->base != NFT_PAYLOAD_TRANSPORT_HEADER) |
| 974 | return -EINVAL; |
| 975 | |
| 976 | if (priv->csum_offset != offsetof(struct sctphdr, checksum)) |
| 977 | return -EINVAL; |
| 978 | break; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 979 | default: |
| 980 | return -EOPNOTSUPP; |
| 981 | } |
Pablo Neira Ayuso | 7044ab2 | 2022-08-21 11:55:19 +0200 | [diff] [blame] | 982 | priv->csum_type = csum_type; |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 983 | |
Pablo Neira Ayuso | 4f16d25 | 2021-01-25 17:28:18 +0100 | [diff] [blame] | 984 | return nft_parse_register_load(tb[NFTA_PAYLOAD_SREG], &priv->sreg, |
| 985 | priv->len); |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 986 | } |
| 987 | |
Phil Sutter | 7d34aa3 | 2022-10-14 23:45:58 +0200 | [diff] [blame] | 988 | static int nft_payload_set_dump(struct sk_buff *skb, |
| 989 | const struct nft_expr *expr, bool reset) |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 990 | { |
| 991 | const struct nft_payload_set *priv = nft_expr_priv(expr); |
| 992 | |
| 993 | if (nft_dump_register(skb, NFTA_PAYLOAD_SREG, priv->sreg) || |
| 994 | nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) || |
| 995 | nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) || |
| 996 | nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)) || |
| 997 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_TYPE, htonl(priv->csum_type)) || |
| 998 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_OFFSET, |
Pablo Neira Ayuso | 1814096 | 2016-11-24 12:04:55 +0100 | [diff] [blame] | 999 | htonl(priv->csum_offset)) || |
| 1000 | nla_put_be32(skb, NFTA_PAYLOAD_CSUM_FLAGS, htonl(priv->csum_flags))) |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 1001 | goto nla_put_failure; |
| 1002 | return 0; |
| 1003 | |
| 1004 | nla_put_failure: |
| 1005 | return -1; |
| 1006 | } |
| 1007 | |
Pablo Neira Ayuso | cc003c7 | 2022-01-09 17:11:25 +0100 | [diff] [blame] | 1008 | static bool nft_payload_set_reduce(struct nft_regs_track *track, |
| 1009 | const struct nft_expr *expr) |
| 1010 | { |
| 1011 | int i; |
| 1012 | |
| 1013 | for (i = 0; i < NFT_REG32_NUM; i++) { |
| 1014 | if (!track->regs[i].selector) |
| 1015 | continue; |
| 1016 | |
| 1017 | if (track->regs[i].selector->ops != &nft_payload_ops && |
| 1018 | track->regs[i].selector->ops != &nft_payload_fast_ops) |
| 1019 | continue; |
| 1020 | |
Pablo Neira Ayuso | 34cc9e5 | 2022-03-14 18:23:01 +0100 | [diff] [blame] | 1021 | __nft_reg_track_cancel(track, i); |
Pablo Neira Ayuso | cc003c7 | 2022-01-09 17:11:25 +0100 | [diff] [blame] | 1022 | } |
| 1023 | |
| 1024 | return false; |
| 1025 | } |
| 1026 | |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 1027 | static const struct nft_expr_ops nft_payload_set_ops = { |
| 1028 | .type = &nft_payload_type, |
| 1029 | .size = NFT_EXPR_SIZE(sizeof(struct nft_payload_set)), |
| 1030 | .eval = nft_payload_set_eval, |
| 1031 | .init = nft_payload_set_init, |
| 1032 | .dump = nft_payload_set_dump, |
Pablo Neira Ayuso | cc003c7 | 2022-01-09 17:11:25 +0100 | [diff] [blame] | 1033 | .reduce = nft_payload_set_reduce, |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 1034 | }; |
| 1035 | |
Pablo Neira Ayuso | 0ca743a | 2013-10-14 00:06:06 +0200 | [diff] [blame] | 1036 | static const struct nft_expr_ops * |
| 1037 | nft_payload_select_ops(const struct nft_ctx *ctx, |
| 1038 | const struct nlattr * const tb[]) |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1039 | { |
| 1040 | enum nft_payload_bases base; |
| 1041 | unsigned int offset, len; |
Pablo Neira Ayuso | 94254f9 | 2022-08-21 11:47:04 +0200 | [diff] [blame] | 1042 | int err; |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1043 | |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 1044 | if (tb[NFTA_PAYLOAD_BASE] == NULL || |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1045 | tb[NFTA_PAYLOAD_OFFSET] == NULL || |
| 1046 | tb[NFTA_PAYLOAD_LEN] == NULL) |
| 1047 | return ERR_PTR(-EINVAL); |
| 1048 | |
| 1049 | base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE])); |
| 1050 | switch (base) { |
| 1051 | case NFT_PAYLOAD_LL_HEADER: |
| 1052 | case NFT_PAYLOAD_NETWORK_HEADER: |
| 1053 | case NFT_PAYLOAD_TRANSPORT_HEADER: |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 1054 | case NFT_PAYLOAD_INNER_HEADER: |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1055 | break; |
| 1056 | default: |
| 1057 | return ERR_PTR(-EOPNOTSUPP); |
| 1058 | } |
| 1059 | |
Patrick McHardy | 7ec3f7b | 2015-11-24 10:00:22 +0000 | [diff] [blame] | 1060 | if (tb[NFTA_PAYLOAD_SREG] != NULL) { |
| 1061 | if (tb[NFTA_PAYLOAD_DREG] != NULL) |
| 1062 | return ERR_PTR(-EINVAL); |
| 1063 | return &nft_payload_set_ops; |
| 1064 | } |
| 1065 | |
| 1066 | if (tb[NFTA_PAYLOAD_DREG] == NULL) |
| 1067 | return ERR_PTR(-EINVAL); |
| 1068 | |
Pablo Neira Ayuso | 94254f9 | 2022-08-21 11:47:04 +0200 | [diff] [blame] | 1069 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_OFFSET], U8_MAX, &offset); |
| 1070 | if (err < 0) |
| 1071 | return ERR_PTR(err); |
| 1072 | |
| 1073 | err = nft_parse_u32_check(tb[NFTA_PAYLOAD_LEN], U8_MAX, &len); |
| 1074 | if (err < 0) |
| 1075 | return ERR_PTR(err); |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1076 | |
Nikolay Aleksandrov | f627ed9 | 2014-02-16 14:01:58 +0100 | [diff] [blame] | 1077 | if (len <= 4 && is_power_of_2(len) && IS_ALIGNED(offset, len) && |
Pablo Neira Ayuso | c46b38d | 2021-10-28 22:15:00 +0200 | [diff] [blame] | 1078 | base != NFT_PAYLOAD_LL_HEADER && base != NFT_PAYLOAD_INNER_HEADER) |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1079 | return &nft_payload_fast_ops; |
| 1080 | else |
| 1081 | return &nft_payload_ops; |
| 1082 | } |
| 1083 | |
Liping Zhang | 4e24877 | 2016-11-06 21:15:51 +0800 | [diff] [blame] | 1084 | struct nft_expr_type nft_payload_type __read_mostly = { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1085 | .name = "payload", |
Patrick McHardy | c29b72e | 2013-10-10 11:06:41 +0200 | [diff] [blame] | 1086 | .select_ops = nft_payload_select_ops, |
Pablo Neira Ayuso | 3a07327 | 2022-10-25 13:48:15 +0200 | [diff] [blame] | 1087 | .inner_ops = &nft_payload_inner_ops, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1088 | .policy = nft_payload_policy, |
| 1089 | .maxattr = NFTA_PAYLOAD_MAX, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 1090 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 1091 | }; |