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 | /* |
| 3 | * Copyright (c) 2008 Patrick McHardy <kaber@trash.net> |
| 4 | * |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 5 | * Development of this code funded by Astaro AG (http://www.astaro.com/) |
| 6 | */ |
| 7 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 8 | #include <asm/unaligned.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 9 | #include <linux/kernel.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 10 | #include <linux/netlink.h> |
| 11 | #include <linux/netfilter.h> |
| 12 | #include <linux/netfilter/nf_tables.h> |
Jeremy Sowden | b9f9a485 | 2023-05-09 22:19:45 +0100 | [diff] [blame] | 13 | #include <linux/dccp.h> |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 14 | #include <linux/sctp.h> |
Florian Westphal | d010315 | 2018-04-16 19:15:56 +0200 | [diff] [blame] | 15 | #include <net/netfilter/nf_tables_core.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 16 | #include <net/netfilter/nf_tables.h> |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 17 | #include <net/tcp.h> |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 18 | |
| 19 | struct nft_exthdr { |
| 20 | u8 type; |
| 21 | u8 offset; |
| 22 | u8 len; |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 23 | u8 op; |
Pablo Neira Ayuso | 345023b | 2021-01-25 18:27:22 +0100 | [diff] [blame] | 24 | u8 dreg; |
Pablo Neira Ayuso | 4f16d25 | 2021-01-25 17:28:18 +0100 | [diff] [blame] | 25 | u8 sreg; |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 26 | u8 flags; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 27 | }; |
| 28 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 29 | static unsigned int optlen(const u8 *opt, unsigned int offset) |
| 30 | { |
| 31 | /* Beware zero-length options: make finite progress */ |
| 32 | if (opt[offset] <= TCPOPT_NOP || opt[offset + 1] == 0) |
| 33 | return 1; |
| 34 | else |
| 35 | return opt[offset + 1]; |
| 36 | } |
| 37 | |
Florian Westphal | fd94d9d | 2023-09-05 23:13:56 +0200 | [diff] [blame] | 38 | static int nft_skb_copy_to_reg(const struct sk_buff *skb, int offset, u32 *dest, unsigned int len) |
| 39 | { |
| 40 | if (len % NFT_REG32_SIZE) |
| 41 | dest[len / NFT_REG32_SIZE] = 0; |
| 42 | |
| 43 | return skb_copy_bits(skb, offset, dest, len); |
| 44 | } |
| 45 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 46 | static void nft_exthdr_ipv6_eval(const struct nft_expr *expr, |
| 47 | struct nft_regs *regs, |
| 48 | const struct nft_pktinfo *pkt) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 49 | { |
| 50 | struct nft_exthdr *priv = nft_expr_priv(expr); |
Patrick McHardy | 49499c3 | 2015-04-11 02:27:37 +0100 | [diff] [blame] | 51 | u32 *dest = ®s->data[priv->dreg]; |
Daniel Borkmann | 540436c | 2013-12-20 11:23:15 +0100 | [diff] [blame] | 52 | unsigned int offset = 0; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 53 | int err; |
| 54 | |
Pablo Neira Ayuso | cdd73cc | 2021-06-10 20:20:30 +0200 | [diff] [blame] | 55 | if (pkt->skb->protocol != htons(ETH_P_IPV6)) |
| 56 | goto err; |
| 57 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 58 | err = ipv6_find_hdr(pkt->skb, &offset, priv->type, NULL, NULL); |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 59 | if (priv->flags & NFT_EXTHDR_F_PRESENT) { |
Stephen Suryaputra | b428336 | 2020-08-04 17:44:09 -0400 | [diff] [blame] | 60 | nft_reg_store8(dest, err >= 0); |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 61 | return; |
| 62 | } else if (err < 0) { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 63 | goto err; |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 64 | } |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 65 | offset += priv->offset; |
| 66 | |
Florian Westphal | fd94d9d | 2023-09-05 23:13:56 +0200 | [diff] [blame] | 67 | if (nft_skb_copy_to_reg(pkt->skb, offset, dest, priv->len) < 0) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 68 | goto err; |
| 69 | return; |
| 70 | err: |
Patrick McHardy | a55e22e | 2015-04-11 02:27:31 +0100 | [diff] [blame] | 71 | regs->verdict.code = NFT_BREAK; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 72 | } |
| 73 | |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 74 | /* find the offset to specified option. |
| 75 | * |
| 76 | * If target header is found, its offset is set in *offset and return option |
| 77 | * number. Otherwise, return negative error. |
| 78 | * |
| 79 | * If the first fragment doesn't contain the End of Options it is considered |
| 80 | * invalid. |
| 81 | */ |
| 82 | static int ipv4_find_option(struct net *net, struct sk_buff *skb, |
| 83 | unsigned int *offset, int target) |
| 84 | { |
| 85 | unsigned char optbuf[sizeof(struct ip_options) + 40]; |
| 86 | struct ip_options *opt = (struct ip_options *)optbuf; |
| 87 | struct iphdr *iph, _iph; |
| 88 | unsigned int start; |
| 89 | bool found = false; |
| 90 | __be32 info; |
| 91 | int optlen; |
| 92 | |
| 93 | iph = skb_header_pointer(skb, 0, sizeof(_iph), &_iph); |
| 94 | if (!iph) |
| 95 | return -EBADMSG; |
| 96 | start = sizeof(struct iphdr); |
| 97 | |
| 98 | optlen = iph->ihl * 4 - (int)sizeof(struct iphdr); |
| 99 | if (optlen <= 0) |
| 100 | return -ENOENT; |
| 101 | |
| 102 | memset(opt, 0, sizeof(struct ip_options)); |
| 103 | /* Copy the options since __ip_options_compile() modifies |
| 104 | * the options. |
| 105 | */ |
| 106 | if (skb_copy_bits(skb, start, opt->__data, optlen)) |
| 107 | return -EBADMSG; |
| 108 | opt->optlen = optlen; |
| 109 | |
| 110 | if (__ip_options_compile(net, opt, NULL, &info)) |
| 111 | return -EBADMSG; |
| 112 | |
| 113 | switch (target) { |
| 114 | case IPOPT_SSRR: |
| 115 | case IPOPT_LSRR: |
| 116 | if (!opt->srr) |
| 117 | break; |
| 118 | found = target == IPOPT_SSRR ? opt->is_strictroute : |
| 119 | !opt->is_strictroute; |
| 120 | if (found) |
| 121 | *offset = opt->srr + start; |
| 122 | break; |
| 123 | case IPOPT_RR: |
| 124 | if (!opt->rr) |
| 125 | break; |
| 126 | *offset = opt->rr + start; |
| 127 | found = true; |
| 128 | break; |
| 129 | case IPOPT_RA: |
| 130 | if (!opt->router_alert) |
| 131 | break; |
| 132 | *offset = opt->router_alert + start; |
| 133 | found = true; |
| 134 | break; |
| 135 | default: |
| 136 | return -EOPNOTSUPP; |
| 137 | } |
| 138 | return found ? target : -ENOENT; |
| 139 | } |
| 140 | |
| 141 | static void nft_exthdr_ipv4_eval(const struct nft_expr *expr, |
| 142 | struct nft_regs *regs, |
| 143 | const struct nft_pktinfo *pkt) |
| 144 | { |
| 145 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 146 | u32 *dest = ®s->data[priv->dreg]; |
| 147 | struct sk_buff *skb = pkt->skb; |
| 148 | unsigned int offset; |
| 149 | int err; |
| 150 | |
| 151 | if (skb->protocol != htons(ETH_P_IP)) |
| 152 | goto err; |
| 153 | |
| 154 | err = ipv4_find_option(nft_net(pkt), skb, &offset, priv->type); |
| 155 | if (priv->flags & NFT_EXTHDR_F_PRESENT) { |
Stephen Suryaputra | b428336 | 2020-08-04 17:44:09 -0400 | [diff] [blame] | 156 | nft_reg_store8(dest, err >= 0); |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 157 | return; |
| 158 | } else if (err < 0) { |
| 159 | goto err; |
| 160 | } |
| 161 | offset += priv->offset; |
| 162 | |
Florian Westphal | fd94d9d | 2023-09-05 23:13:56 +0200 | [diff] [blame] | 163 | if (nft_skb_copy_to_reg(pkt->skb, offset, dest, priv->len) < 0) |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 164 | goto err; |
| 165 | return; |
| 166 | err: |
| 167 | regs->verdict.code = NFT_BREAK; |
| 168 | } |
| 169 | |
Florian Westphal | a181770 | 2017-08-08 15:15:27 +0200 | [diff] [blame] | 170 | static void * |
| 171 | nft_tcp_header_pointer(const struct nft_pktinfo *pkt, |
| 172 | unsigned int len, void *buffer, unsigned int *tcphdr_len) |
| 173 | { |
| 174 | struct tcphdr *tcph; |
| 175 | |
Florian Westphal | a9e8503 | 2022-01-29 17:13:23 +0100 | [diff] [blame] | 176 | if (pkt->tprot != IPPROTO_TCP || pkt->fragoff) |
Florian Westphal | a181770 | 2017-08-08 15:15:27 +0200 | [diff] [blame] | 177 | return NULL; |
| 178 | |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 179 | tcph = skb_header_pointer(pkt->skb, nft_thoff(pkt), sizeof(*tcph), buffer); |
Florian Westphal | a181770 | 2017-08-08 15:15:27 +0200 | [diff] [blame] | 180 | if (!tcph) |
| 181 | return NULL; |
| 182 | |
| 183 | *tcphdr_len = __tcp_hdrlen(tcph); |
| 184 | if (*tcphdr_len < sizeof(*tcph) || *tcphdr_len > len) |
| 185 | return NULL; |
| 186 | |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 187 | return skb_header_pointer(pkt->skb, nft_thoff(pkt), *tcphdr_len, buffer); |
Florian Westphal | a181770 | 2017-08-08 15:15:27 +0200 | [diff] [blame] | 188 | } |
| 189 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 190 | static void nft_exthdr_tcp_eval(const struct nft_expr *expr, |
| 191 | struct nft_regs *regs, |
| 192 | const struct nft_pktinfo *pkt) |
| 193 | { |
| 194 | u8 buff[sizeof(struct tcphdr) + MAX_TCP_OPTION_SPACE]; |
| 195 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 196 | unsigned int i, optl, tcphdr_len, offset; |
| 197 | u32 *dest = ®s->data[priv->dreg]; |
| 198 | struct tcphdr *tcph; |
| 199 | u8 *opt; |
| 200 | |
Florian Westphal | a181770 | 2017-08-08 15:15:27 +0200 | [diff] [blame] | 201 | tcph = nft_tcp_header_pointer(pkt, sizeof(buff), buff, &tcphdr_len); |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 202 | if (!tcph) |
| 203 | goto err; |
| 204 | |
| 205 | opt = (u8 *)tcph; |
| 206 | for (i = sizeof(*tcph); i < tcphdr_len - 1; i += optl) { |
| 207 | optl = optlen(opt, i); |
| 208 | |
| 209 | if (priv->type != opt[i]) |
| 210 | continue; |
| 211 | |
| 212 | if (i + optl > tcphdr_len || priv->len + priv->offset > optl) |
| 213 | goto err; |
| 214 | |
| 215 | offset = i + priv->offset; |
Phil Sutter | 3c1fece | 2017-02-20 17:52:27 +0100 | [diff] [blame] | 216 | if (priv->flags & NFT_EXTHDR_F_PRESENT) { |
Florian Westphal | 63331e3 | 2023-12-04 12:29:54 +0100 | [diff] [blame] | 217 | nft_reg_store8(dest, 1); |
Phil Sutter | 3c1fece | 2017-02-20 17:52:27 +0100 | [diff] [blame] | 218 | } else { |
Florian Westphal | fd94d9d | 2023-09-05 23:13:56 +0200 | [diff] [blame] | 219 | if (priv->len % NFT_REG32_SIZE) |
| 220 | dest[priv->len / NFT_REG32_SIZE] = 0; |
Phil Sutter | 3c1fece | 2017-02-20 17:52:27 +0100 | [diff] [blame] | 221 | memcpy(dest, opt + offset, priv->len); |
| 222 | } |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 223 | |
| 224 | return; |
| 225 | } |
| 226 | |
| 227 | err: |
Phil Sutter | 3c1fece | 2017-02-20 17:52:27 +0100 | [diff] [blame] | 228 | if (priv->flags & NFT_EXTHDR_F_PRESENT) |
| 229 | *dest = 0; |
| 230 | else |
| 231 | regs->verdict.code = NFT_BREAK; |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 232 | } |
| 233 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 234 | static void nft_exthdr_tcp_set_eval(const struct nft_expr *expr, |
| 235 | struct nft_regs *regs, |
| 236 | const struct nft_pktinfo *pkt) |
| 237 | { |
| 238 | u8 buff[sizeof(struct tcphdr) + MAX_TCP_OPTION_SPACE]; |
| 239 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 240 | unsigned int i, optl, tcphdr_len, offset; |
| 241 | struct tcphdr *tcph; |
| 242 | u8 *opt; |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 243 | |
| 244 | tcph = nft_tcp_header_pointer(pkt, sizeof(buff), buff, &tcphdr_len); |
| 245 | if (!tcph) |
Pablo Neira Ayuso | 962e5a4 | 2021-11-30 11:34:04 +0100 | [diff] [blame] | 246 | goto err; |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 247 | |
Xiao Liang | 28427f3 | 2023-08-25 13:33:27 +0800 | [diff] [blame] | 248 | if (skb_ensure_writable(pkt->skb, nft_thoff(pkt) + tcphdr_len)) |
| 249 | goto err; |
| 250 | |
| 251 | tcph = (struct tcphdr *)(pkt->skb->data + nft_thoff(pkt)); |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 252 | opt = (u8 *)tcph; |
Xiao Liang | 28427f3 | 2023-08-25 13:33:27 +0800 | [diff] [blame] | 253 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 254 | for (i = sizeof(*tcph); i < tcphdr_len - 1; i += optl) { |
| 255 | union { |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 256 | __be16 v16; |
| 257 | __be32 v32; |
| 258 | } old, new; |
| 259 | |
| 260 | optl = optlen(opt, i); |
| 261 | |
| 262 | if (priv->type != opt[i]) |
| 263 | continue; |
| 264 | |
| 265 | if (i + optl > tcphdr_len || priv->len + priv->offset > optl) |
Pablo Neira Ayuso | 962e5a4 | 2021-11-30 11:34:04 +0100 | [diff] [blame] | 266 | goto err; |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 267 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 268 | offset = i + priv->offset; |
| 269 | |
| 270 | switch (priv->len) { |
| 271 | case 2: |
Florian Westphal | ffb3d9a | 2022-06-23 15:05:13 +0200 | [diff] [blame] | 272 | old.v16 = (__force __be16)get_unaligned((u16 *)(opt + offset)); |
Sergey Marinkevich | 2e34328 | 2020-03-29 19:19:14 +0700 | [diff] [blame] | 273 | new.v16 = (__force __be16)nft_reg_load16( |
| 274 | ®s->data[priv->sreg]); |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 275 | |
| 276 | switch (priv->type) { |
| 277 | case TCPOPT_MSS: |
| 278 | /* increase can cause connection to stall */ |
| 279 | if (ntohs(old.v16) <= ntohs(new.v16)) |
| 280 | return; |
| 281 | break; |
| 282 | } |
| 283 | |
| 284 | if (old.v16 == new.v16) |
| 285 | return; |
| 286 | |
Florian Westphal | ffb3d9a | 2022-06-23 15:05:13 +0200 | [diff] [blame] | 287 | put_unaligned(new.v16, (__be16*)(opt + offset)); |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 288 | inet_proto_csum_replace2(&tcph->check, pkt->skb, |
| 289 | old.v16, new.v16, false); |
| 290 | break; |
| 291 | case 4: |
Florian Westphal | ffb3d9a | 2022-06-23 15:05:13 +0200 | [diff] [blame] | 292 | new.v32 = nft_reg_load_be32(®s->data[priv->sreg]); |
| 293 | old.v32 = (__force __be32)get_unaligned((u32 *)(opt + offset)); |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 294 | |
| 295 | if (old.v32 == new.v32) |
| 296 | return; |
| 297 | |
Florian Westphal | ffb3d9a | 2022-06-23 15:05:13 +0200 | [diff] [blame] | 298 | put_unaligned(new.v32, (__be32*)(opt + offset)); |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 299 | inet_proto_csum_replace4(&tcph->check, pkt->skb, |
| 300 | old.v32, new.v32, false); |
| 301 | break; |
| 302 | default: |
| 303 | WARN_ON_ONCE(1); |
| 304 | break; |
| 305 | } |
| 306 | |
| 307 | return; |
| 308 | } |
Pablo Neira Ayuso | 962e5a4 | 2021-11-30 11:34:04 +0100 | [diff] [blame] | 309 | return; |
| 310 | err: |
| 311 | regs->verdict.code = NFT_BREAK; |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 312 | } |
| 313 | |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 314 | static void nft_exthdr_tcp_strip_eval(const struct nft_expr *expr, |
| 315 | struct nft_regs *regs, |
| 316 | const struct nft_pktinfo *pkt) |
| 317 | { |
| 318 | u8 buff[sizeof(struct tcphdr) + MAX_TCP_OPTION_SPACE]; |
| 319 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 320 | unsigned int i, tcphdr_len, optl; |
| 321 | struct tcphdr *tcph; |
| 322 | u8 *opt; |
| 323 | |
| 324 | tcph = nft_tcp_header_pointer(pkt, sizeof(buff), buff, &tcphdr_len); |
| 325 | if (!tcph) |
| 326 | goto err; |
| 327 | |
| 328 | if (skb_ensure_writable(pkt->skb, nft_thoff(pkt) + tcphdr_len)) |
| 329 | goto drop; |
| 330 | |
Xiao Liang | 28427f3 | 2023-08-25 13:33:27 +0800 | [diff] [blame] | 331 | tcph = (struct tcphdr *)(pkt->skb->data + nft_thoff(pkt)); |
| 332 | opt = (u8 *)tcph; |
| 333 | |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 334 | for (i = sizeof(*tcph); i < tcphdr_len - 1; i += optl) { |
| 335 | unsigned int j; |
| 336 | |
| 337 | optl = optlen(opt, i); |
| 338 | if (priv->type != opt[i]) |
| 339 | continue; |
| 340 | |
| 341 | if (i + optl > tcphdr_len) |
| 342 | goto drop; |
| 343 | |
| 344 | for (j = 0; j < optl; ++j) { |
| 345 | u16 n = TCPOPT_NOP; |
| 346 | u16 o = opt[i+j]; |
| 347 | |
| 348 | if ((i + j) % 2 == 0) { |
| 349 | o <<= 8; |
| 350 | n <<= 8; |
| 351 | } |
| 352 | inet_proto_csum_replace2(&tcph->check, pkt->skb, htons(o), |
| 353 | htons(n), false); |
| 354 | } |
| 355 | memset(opt + i, TCPOPT_NOP, optl); |
| 356 | return; |
| 357 | } |
| 358 | |
| 359 | /* option not found, continue. This allows to do multiple |
| 360 | * option removals per rule. |
| 361 | */ |
| 362 | return; |
| 363 | err: |
| 364 | regs->verdict.code = NFT_BREAK; |
| 365 | return; |
| 366 | drop: |
| 367 | /* can't remove, no choice but to drop */ |
| 368 | regs->verdict.code = NF_DROP; |
| 369 | } |
| 370 | |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 371 | static void nft_exthdr_sctp_eval(const struct nft_expr *expr, |
| 372 | struct nft_regs *regs, |
| 373 | const struct nft_pktinfo *pkt) |
| 374 | { |
Florian Westphal | 2d7b4ac | 2021-05-28 12:30:06 +0200 | [diff] [blame] | 375 | unsigned int offset = nft_thoff(pkt) + sizeof(struct sctphdr); |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 376 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 377 | u32 *dest = ®s->data[priv->dreg]; |
| 378 | const struct sctp_chunkhdr *sch; |
| 379 | struct sctp_chunkhdr _sch; |
| 380 | |
Phil Sutter | 5acc44f | 2021-06-11 19:06:45 +0200 | [diff] [blame] | 381 | if (pkt->tprot != IPPROTO_SCTP) |
| 382 | goto err; |
| 383 | |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 384 | do { |
| 385 | sch = skb_header_pointer(pkt->skb, offset, sizeof(_sch), &_sch); |
| 386 | if (!sch || !sch->length) |
| 387 | break; |
| 388 | |
| 389 | if (sch->type == priv->type) { |
| 390 | if (priv->flags & NFT_EXTHDR_F_PRESENT) { |
| 391 | nft_reg_store8(dest, true); |
| 392 | return; |
| 393 | } |
| 394 | if (priv->offset + priv->len > ntohs(sch->length) || |
| 395 | offset + ntohs(sch->length) > pkt->skb->len) |
| 396 | break; |
| 397 | |
Florian Westphal | fd94d9d | 2023-09-05 23:13:56 +0200 | [diff] [blame] | 398 | if (nft_skb_copy_to_reg(pkt->skb, offset + priv->offset, |
| 399 | dest, priv->len) < 0) |
Phil Sutter | cf6b5ff | 2021-06-08 11:40:57 +0200 | [diff] [blame] | 400 | break; |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 401 | return; |
| 402 | } |
| 403 | offset += SCTP_PAD4(ntohs(sch->length)); |
| 404 | } while (offset < pkt->skb->len); |
Phil Sutter | 5acc44f | 2021-06-11 19:06:45 +0200 | [diff] [blame] | 405 | err: |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 406 | if (priv->flags & NFT_EXTHDR_F_PRESENT) |
| 407 | nft_reg_store8(dest, false); |
| 408 | else |
| 409 | regs->verdict.code = NFT_BREAK; |
| 410 | } |
| 411 | |
Jeremy Sowden | b9f9a485 | 2023-05-09 22:19:45 +0100 | [diff] [blame] | 412 | static void nft_exthdr_dccp_eval(const struct nft_expr *expr, |
| 413 | struct nft_regs *regs, |
| 414 | const struct nft_pktinfo *pkt) |
| 415 | { |
| 416 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 417 | unsigned int thoff, dataoff, optoff, optlen, i; |
| 418 | u32 *dest = ®s->data[priv->dreg]; |
| 419 | const struct dccp_hdr *dh; |
| 420 | struct dccp_hdr _dh; |
| 421 | |
| 422 | if (pkt->tprot != IPPROTO_DCCP || pkt->fragoff) |
| 423 | goto err; |
| 424 | |
| 425 | thoff = nft_thoff(pkt); |
| 426 | |
| 427 | dh = skb_header_pointer(pkt->skb, thoff, sizeof(_dh), &_dh); |
| 428 | if (!dh) |
| 429 | goto err; |
| 430 | |
| 431 | dataoff = dh->dccph_doff * sizeof(u32); |
| 432 | optoff = __dccp_hdr_len(dh); |
| 433 | if (dataoff <= optoff) |
| 434 | goto err; |
| 435 | |
| 436 | optlen = dataoff - optoff; |
| 437 | |
| 438 | for (i = 0; i < optlen; ) { |
| 439 | /* Options 0 (DCCPO_PADDING) - 31 (DCCPO_MAX_RESERVED) are 1B in |
| 440 | * the length; the remaining options are at least 2B long. In |
| 441 | * all cases, the first byte contains the option type. In |
| 442 | * multi-byte options, the second byte contains the option |
| 443 | * length, which must be at least two: 1 for the type plus 1 for |
| 444 | * the length plus 0-253 for any following option data. We |
| 445 | * aren't interested in the option data, only the type and the |
| 446 | * length, so we don't need to read more than two bytes at a |
| 447 | * time. |
| 448 | */ |
| 449 | unsigned int buflen = optlen - i; |
| 450 | u8 buf[2], *bufp; |
| 451 | u8 type, len; |
| 452 | |
| 453 | if (buflen > sizeof(buf)) |
| 454 | buflen = sizeof(buf); |
| 455 | |
| 456 | bufp = skb_header_pointer(pkt->skb, thoff + optoff + i, buflen, |
| 457 | &buf); |
| 458 | if (!bufp) |
| 459 | goto err; |
| 460 | |
| 461 | type = bufp[0]; |
| 462 | |
| 463 | if (type == priv->type) { |
Florian Westphal | 63331e3 | 2023-12-04 12:29:54 +0100 | [diff] [blame] | 464 | nft_reg_store8(dest, 1); |
Jeremy Sowden | b9f9a485 | 2023-05-09 22:19:45 +0100 | [diff] [blame] | 465 | return; |
| 466 | } |
| 467 | |
| 468 | if (type <= DCCPO_MAX_RESERVED) { |
| 469 | i++; |
| 470 | continue; |
| 471 | } |
| 472 | |
| 473 | if (buflen < 2) |
| 474 | goto err; |
| 475 | |
| 476 | len = bufp[1]; |
| 477 | |
| 478 | if (len < 2) |
| 479 | goto err; |
| 480 | |
| 481 | i += len; |
| 482 | } |
| 483 | |
| 484 | err: |
| 485 | *dest = 0; |
| 486 | } |
| 487 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 488 | static const struct nla_policy nft_exthdr_policy[NFTA_EXTHDR_MAX + 1] = { |
| 489 | [NFTA_EXTHDR_DREG] = { .type = NLA_U32 }, |
| 490 | [NFTA_EXTHDR_TYPE] = { .type = NLA_U8 }, |
| 491 | [NFTA_EXTHDR_OFFSET] = { .type = NLA_U32 }, |
Florian Westphal | a412dbf | 2023-06-21 21:11:03 +0200 | [diff] [blame] | 492 | [NFTA_EXTHDR_LEN] = NLA_POLICY_MAX(NLA_BE32, 255), |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 493 | [NFTA_EXTHDR_FLAGS] = { .type = NLA_U32 }, |
Florian Westphal | a412dbf | 2023-06-21 21:11:03 +0200 | [diff] [blame] | 494 | [NFTA_EXTHDR_OP] = NLA_POLICY_MAX(NLA_BE32, 255), |
Florian Westphal | f5b5702 | 2017-12-11 10:14:27 +0100 | [diff] [blame] | 495 | [NFTA_EXTHDR_SREG] = { .type = NLA_U32 }, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 496 | }; |
| 497 | |
| 498 | static int nft_exthdr_init(const struct nft_ctx *ctx, |
| 499 | const struct nft_expr *expr, |
| 500 | const struct nlattr * const tb[]) |
| 501 | { |
| 502 | struct nft_exthdr *priv = nft_expr_priv(expr); |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 503 | u32 offset, len, flags = 0, op = NFT_EXTHDR_OP_IPV6; |
Dan Carpenter | 21a9e0f | 2016-10-12 09:09:12 +0300 | [diff] [blame] | 504 | int err; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 505 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 506 | if (!tb[NFTA_EXTHDR_DREG] || |
| 507 | !tb[NFTA_EXTHDR_TYPE] || |
| 508 | !tb[NFTA_EXTHDR_OFFSET] || |
| 509 | !tb[NFTA_EXTHDR_LEN]) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 510 | return -EINVAL; |
| 511 | |
Laura Garcia Liebana | 36b701f | 2016-09-14 15:00:02 +0200 | [diff] [blame] | 512 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_OFFSET], U8_MAX, &offset); |
| 513 | if (err < 0) |
| 514 | return err; |
Laura Garcia Liebana | 4da449a | 2016-08-09 20:46:16 +0200 | [diff] [blame] | 515 | |
Laura Garcia Liebana | 36b701f | 2016-09-14 15:00:02 +0200 | [diff] [blame] | 516 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_LEN], U8_MAX, &len); |
| 517 | if (err < 0) |
| 518 | return err; |
Laura Garcia Liebana | 4da449a | 2016-08-09 20:46:16 +0200 | [diff] [blame] | 519 | |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 520 | if (tb[NFTA_EXTHDR_FLAGS]) { |
| 521 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_FLAGS], U8_MAX, &flags); |
| 522 | if (err < 0) |
| 523 | return err; |
| 524 | |
| 525 | if (flags & ~NFT_EXTHDR_F_PRESENT) |
| 526 | return -EINVAL; |
| 527 | } |
| 528 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 529 | if (tb[NFTA_EXTHDR_OP]) { |
| 530 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_OP], U8_MAX, &op); |
| 531 | if (err < 0) |
| 532 | return err; |
| 533 | } |
| 534 | |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 535 | priv->type = nla_get_u8(tb[NFTA_EXTHDR_TYPE]); |
Laura Garcia Liebana | 4da449a | 2016-08-09 20:46:16 +0200 | [diff] [blame] | 536 | priv->offset = offset; |
| 537 | priv->len = len; |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 538 | priv->flags = flags; |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 539 | priv->op = op; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 540 | |
Pablo Neira Ayuso | 345023b | 2021-01-25 18:27:22 +0100 | [diff] [blame] | 541 | return nft_parse_register_store(ctx, tb[NFTA_EXTHDR_DREG], |
| 542 | &priv->dreg, NULL, NFT_DATA_VALUE, |
| 543 | priv->len); |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 544 | } |
| 545 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 546 | static int nft_exthdr_tcp_set_init(const struct nft_ctx *ctx, |
| 547 | const struct nft_expr *expr, |
| 548 | const struct nlattr * const tb[]) |
| 549 | { |
| 550 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 551 | u32 offset, len, flags = 0, op = NFT_EXTHDR_OP_IPV6; |
| 552 | int err; |
| 553 | |
| 554 | if (!tb[NFTA_EXTHDR_SREG] || |
| 555 | !tb[NFTA_EXTHDR_TYPE] || |
| 556 | !tb[NFTA_EXTHDR_OFFSET] || |
| 557 | !tb[NFTA_EXTHDR_LEN]) |
| 558 | return -EINVAL; |
| 559 | |
| 560 | if (tb[NFTA_EXTHDR_DREG] || tb[NFTA_EXTHDR_FLAGS]) |
| 561 | return -EINVAL; |
| 562 | |
| 563 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_OFFSET], U8_MAX, &offset); |
| 564 | if (err < 0) |
| 565 | return err; |
| 566 | |
| 567 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_LEN], U8_MAX, &len); |
| 568 | if (err < 0) |
| 569 | return err; |
| 570 | |
| 571 | if (offset < 2) |
| 572 | return -EOPNOTSUPP; |
| 573 | |
| 574 | switch (len) { |
| 575 | case 2: break; |
| 576 | case 4: break; |
| 577 | default: |
| 578 | return -EOPNOTSUPP; |
| 579 | } |
| 580 | |
| 581 | err = nft_parse_u32_check(tb[NFTA_EXTHDR_OP], U8_MAX, &op); |
| 582 | if (err < 0) |
| 583 | return err; |
| 584 | |
| 585 | priv->type = nla_get_u8(tb[NFTA_EXTHDR_TYPE]); |
| 586 | priv->offset = offset; |
| 587 | priv->len = len; |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 588 | priv->flags = flags; |
| 589 | priv->op = op; |
| 590 | |
Pablo Neira Ayuso | 4f16d25 | 2021-01-25 17:28:18 +0100 | [diff] [blame] | 591 | return nft_parse_register_load(tb[NFTA_EXTHDR_SREG], &priv->sreg, |
| 592 | priv->len); |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 593 | } |
| 594 | |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 595 | static int nft_exthdr_tcp_strip_init(const struct nft_ctx *ctx, |
| 596 | const struct nft_expr *expr, |
| 597 | const struct nlattr * const tb[]) |
| 598 | { |
| 599 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 600 | |
| 601 | if (tb[NFTA_EXTHDR_SREG] || |
| 602 | tb[NFTA_EXTHDR_DREG] || |
| 603 | tb[NFTA_EXTHDR_FLAGS] || |
| 604 | tb[NFTA_EXTHDR_OFFSET] || |
| 605 | tb[NFTA_EXTHDR_LEN]) |
| 606 | return -EINVAL; |
| 607 | |
| 608 | if (!tb[NFTA_EXTHDR_TYPE]) |
| 609 | return -EINVAL; |
| 610 | |
| 611 | priv->type = nla_get_u8(tb[NFTA_EXTHDR_TYPE]); |
| 612 | priv->op = NFT_EXTHDR_OP_TCPOPT; |
| 613 | |
| 614 | return 0; |
| 615 | } |
| 616 | |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 617 | static int nft_exthdr_ipv4_init(const struct nft_ctx *ctx, |
| 618 | const struct nft_expr *expr, |
| 619 | const struct nlattr * const tb[]) |
| 620 | { |
| 621 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 622 | int err = nft_exthdr_init(ctx, expr, tb); |
| 623 | |
| 624 | if (err < 0) |
| 625 | return err; |
| 626 | |
| 627 | switch (priv->type) { |
| 628 | case IPOPT_SSRR: |
| 629 | case IPOPT_LSRR: |
| 630 | case IPOPT_RR: |
| 631 | case IPOPT_RA: |
| 632 | break; |
| 633 | default: |
| 634 | return -EOPNOTSUPP; |
| 635 | } |
| 636 | return 0; |
| 637 | } |
| 638 | |
Jeremy Sowden | b9f9a485 | 2023-05-09 22:19:45 +0100 | [diff] [blame] | 639 | static int nft_exthdr_dccp_init(const struct nft_ctx *ctx, |
| 640 | const struct nft_expr *expr, |
| 641 | const struct nlattr * const tb[]) |
| 642 | { |
| 643 | struct nft_exthdr *priv = nft_expr_priv(expr); |
| 644 | int err = nft_exthdr_init(ctx, expr, tb); |
| 645 | |
| 646 | if (err < 0) |
| 647 | return err; |
| 648 | |
| 649 | if (!(priv->flags & NFT_EXTHDR_F_PRESENT)) |
| 650 | return -EOPNOTSUPP; |
| 651 | |
| 652 | return 0; |
| 653 | } |
| 654 | |
Florian Westphal | 5e7d695 | 2017-08-08 15:15:28 +0200 | [diff] [blame] | 655 | static int nft_exthdr_dump_common(struct sk_buff *skb, const struct nft_exthdr *priv) |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 656 | { |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 657 | if (nla_put_u8(skb, NFTA_EXTHDR_TYPE, priv->type)) |
| 658 | goto nla_put_failure; |
| 659 | if (nla_put_be32(skb, NFTA_EXTHDR_OFFSET, htonl(priv->offset))) |
| 660 | goto nla_put_failure; |
| 661 | if (nla_put_be32(skb, NFTA_EXTHDR_LEN, htonl(priv->len))) |
| 662 | goto nla_put_failure; |
Phil Sutter | c078ca3 | 2017-01-17 22:51:26 +0100 | [diff] [blame] | 663 | if (nla_put_be32(skb, NFTA_EXTHDR_FLAGS, htonl(priv->flags))) |
| 664 | goto nla_put_failure; |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 665 | if (nla_put_be32(skb, NFTA_EXTHDR_OP, htonl(priv->op))) |
| 666 | goto nla_put_failure; |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 667 | return 0; |
| 668 | |
| 669 | nla_put_failure: |
| 670 | return -1; |
| 671 | } |
| 672 | |
Phil Sutter | 7d34aa3 | 2022-10-14 23:45:58 +0200 | [diff] [blame] | 673 | static int nft_exthdr_dump(struct sk_buff *skb, |
| 674 | const struct nft_expr *expr, bool reset) |
Florian Westphal | 5e7d695 | 2017-08-08 15:15:28 +0200 | [diff] [blame] | 675 | { |
| 676 | const struct nft_exthdr *priv = nft_expr_priv(expr); |
| 677 | |
| 678 | if (nft_dump_register(skb, NFTA_EXTHDR_DREG, priv->dreg)) |
| 679 | return -1; |
| 680 | |
| 681 | return nft_exthdr_dump_common(skb, priv); |
| 682 | } |
| 683 | |
Phil Sutter | 7d34aa3 | 2022-10-14 23:45:58 +0200 | [diff] [blame] | 684 | static int nft_exthdr_dump_set(struct sk_buff *skb, |
| 685 | const struct nft_expr *expr, bool reset) |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 686 | { |
| 687 | const struct nft_exthdr *priv = nft_expr_priv(expr); |
| 688 | |
| 689 | if (nft_dump_register(skb, NFTA_EXTHDR_SREG, priv->sreg)) |
| 690 | return -1; |
| 691 | |
| 692 | return nft_exthdr_dump_common(skb, priv); |
| 693 | } |
| 694 | |
Phil Sutter | 7d34aa3 | 2022-10-14 23:45:58 +0200 | [diff] [blame] | 695 | static int nft_exthdr_dump_strip(struct sk_buff *skb, |
| 696 | const struct nft_expr *expr, bool reset) |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 697 | { |
| 698 | const struct nft_exthdr *priv = nft_expr_priv(expr); |
| 699 | |
| 700 | return nft_exthdr_dump_common(skb, priv); |
| 701 | } |
| 702 | |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 703 | static bool nft_exthdr_reduce(struct nft_regs_track *track, |
| 704 | const struct nft_expr *expr) |
| 705 | { |
| 706 | const struct nft_exthdr *priv = nft_expr_priv(expr); |
| 707 | const struct nft_exthdr *exthdr; |
| 708 | |
| 709 | if (!nft_reg_track_cmp(track, expr, priv->dreg)) { |
| 710 | nft_reg_track_update(track, expr, priv->dreg, priv->len); |
| 711 | return false; |
| 712 | } |
| 713 | |
| 714 | exthdr = nft_expr_priv(track->regs[priv->dreg].selector); |
| 715 | if (priv->type != exthdr->type || |
| 716 | priv->op != exthdr->op || |
| 717 | priv->flags != exthdr->flags || |
| 718 | priv->offset != exthdr->offset || |
| 719 | priv->len != exthdr->len) { |
| 720 | nft_reg_track_update(track, expr, priv->dreg, priv->len); |
| 721 | return false; |
| 722 | } |
| 723 | |
| 724 | if (!track->regs[priv->dreg].bitwise) |
| 725 | return true; |
| 726 | |
| 727 | return nft_expr_reduce_bitwise(track, expr); |
| 728 | } |
| 729 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 730 | static const struct nft_expr_ops nft_exthdr_ipv6_ops = { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 731 | .type = &nft_exthdr_type, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 732 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 733 | .eval = nft_exthdr_ipv6_eval, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 734 | .init = nft_exthdr_init, |
| 735 | .dump = nft_exthdr_dump, |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 736 | .reduce = nft_exthdr_reduce, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 737 | }; |
| 738 | |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 739 | static const struct nft_expr_ops nft_exthdr_ipv4_ops = { |
| 740 | .type = &nft_exthdr_type, |
| 741 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
| 742 | .eval = nft_exthdr_ipv4_eval, |
| 743 | .init = nft_exthdr_ipv4_init, |
| 744 | .dump = nft_exthdr_dump, |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 745 | .reduce = nft_exthdr_reduce, |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 746 | }; |
| 747 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 748 | static const struct nft_expr_ops nft_exthdr_tcp_ops = { |
| 749 | .type = &nft_exthdr_type, |
| 750 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
| 751 | .eval = nft_exthdr_tcp_eval, |
| 752 | .init = nft_exthdr_init, |
| 753 | .dump = nft_exthdr_dump, |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 754 | .reduce = nft_exthdr_reduce, |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 755 | }; |
| 756 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 757 | static const struct nft_expr_ops nft_exthdr_tcp_set_ops = { |
| 758 | .type = &nft_exthdr_type, |
| 759 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
| 760 | .eval = nft_exthdr_tcp_set_eval, |
| 761 | .init = nft_exthdr_tcp_set_init, |
| 762 | .dump = nft_exthdr_dump_set, |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 763 | .reduce = NFT_REDUCE_READONLY, |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 764 | }; |
| 765 | |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 766 | static const struct nft_expr_ops nft_exthdr_tcp_strip_ops = { |
| 767 | .type = &nft_exthdr_type, |
| 768 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
| 769 | .eval = nft_exthdr_tcp_strip_eval, |
| 770 | .init = nft_exthdr_tcp_strip_init, |
| 771 | .dump = nft_exthdr_dump_strip, |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 772 | .reduce = NFT_REDUCE_READONLY, |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 773 | }; |
| 774 | |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 775 | static const struct nft_expr_ops nft_exthdr_sctp_ops = { |
| 776 | .type = &nft_exthdr_type, |
| 777 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
| 778 | .eval = nft_exthdr_sctp_eval, |
| 779 | .init = nft_exthdr_init, |
| 780 | .dump = nft_exthdr_dump, |
Florian Westphal | e86dbdb | 2022-03-14 18:23:13 +0100 | [diff] [blame] | 781 | .reduce = nft_exthdr_reduce, |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 782 | }; |
| 783 | |
Jeremy Sowden | b9f9a485 | 2023-05-09 22:19:45 +0100 | [diff] [blame] | 784 | static const struct nft_expr_ops nft_exthdr_dccp_ops = { |
| 785 | .type = &nft_exthdr_type, |
| 786 | .size = NFT_EXPR_SIZE(sizeof(struct nft_exthdr)), |
| 787 | .eval = nft_exthdr_dccp_eval, |
| 788 | .init = nft_exthdr_dccp_init, |
| 789 | .dump = nft_exthdr_dump, |
| 790 | .reduce = nft_exthdr_reduce, |
| 791 | }; |
| 792 | |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 793 | static const struct nft_expr_ops * |
| 794 | nft_exthdr_select_ops(const struct nft_ctx *ctx, |
| 795 | const struct nlattr * const tb[]) |
| 796 | { |
| 797 | u32 op; |
| 798 | |
| 799 | if (!tb[NFTA_EXTHDR_OP]) |
| 800 | return &nft_exthdr_ipv6_ops; |
| 801 | |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 802 | if (tb[NFTA_EXTHDR_SREG] && tb[NFTA_EXTHDR_DREG]) |
| 803 | return ERR_PTR(-EOPNOTSUPP); |
| 804 | |
Florian Westphal | 5fd02eb | 2017-08-21 16:19:26 +0200 | [diff] [blame] | 805 | op = ntohl(nla_get_be32(tb[NFTA_EXTHDR_OP])); |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 806 | switch (op) { |
| 807 | case NFT_EXTHDR_OP_TCPOPT: |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 808 | if (tb[NFTA_EXTHDR_SREG]) |
| 809 | return &nft_exthdr_tcp_set_ops; |
| 810 | if (tb[NFTA_EXTHDR_DREG]) |
| 811 | return &nft_exthdr_tcp_ops; |
Florian Westphal | 7890cbe | 2022-01-28 13:00:36 +0100 | [diff] [blame] | 812 | return &nft_exthdr_tcp_strip_ops; |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 813 | case NFT_EXTHDR_OP_IPV6: |
Florian Westphal | 99d1712 | 2017-08-08 15:15:29 +0200 | [diff] [blame] | 814 | if (tb[NFTA_EXTHDR_DREG]) |
| 815 | return &nft_exthdr_ipv6_ops; |
| 816 | break; |
Stephen Suryaputra | dbb5281 | 2019-06-20 12:19:59 -0400 | [diff] [blame] | 817 | case NFT_EXTHDR_OP_IPV4: |
| 818 | if (ctx->family != NFPROTO_IPV6) { |
| 819 | if (tb[NFTA_EXTHDR_DREG]) |
| 820 | return &nft_exthdr_ipv4_ops; |
| 821 | } |
| 822 | break; |
Phil Sutter | 133dc20 | 2021-05-04 17:54:06 +0200 | [diff] [blame] | 823 | case NFT_EXTHDR_OP_SCTP: |
| 824 | if (tb[NFTA_EXTHDR_DREG]) |
| 825 | return &nft_exthdr_sctp_ops; |
| 826 | break; |
Jeremy Sowden | b9f9a485 | 2023-05-09 22:19:45 +0100 | [diff] [blame] | 827 | case NFT_EXTHDR_OP_DCCP: |
| 828 | if (tb[NFTA_EXTHDR_DREG]) |
| 829 | return &nft_exthdr_dccp_ops; |
| 830 | break; |
Manuel Messner | 935b7f6 | 2017-02-07 03:14:53 +0100 | [diff] [blame] | 831 | } |
| 832 | |
| 833 | return ERR_PTR(-EOPNOTSUPP); |
| 834 | } |
| 835 | |
Florian Westphal | d010315 | 2018-04-16 19:15:56 +0200 | [diff] [blame] | 836 | struct nft_expr_type nft_exthdr_type __read_mostly = { |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 837 | .name = "exthdr", |
Arushi Singhal | d4ef383 | 2017-04-02 14:52:12 +0530 | [diff] [blame] | 838 | .select_ops = nft_exthdr_select_ops, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 839 | .policy = nft_exthdr_policy, |
| 840 | .maxattr = NFTA_EXTHDR_MAX, |
Patrick McHardy | ef1f7df | 2013-10-10 11:41:20 +0200 | [diff] [blame] | 841 | .owner = THIS_MODULE, |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 842 | }; |