blob: 1ebee25de67721934531095848d358c9895f0620 [file] [log] [blame]
// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2008-2009 Patrick McHardy <kaber@trash.net>
* Copyright (c) 2016 Pablo Neira Ayuso <pablo@netfilter.org>
*
* Development of this code funded by Astaro AG (http://www.astaro.com/)
*/
#include <linux/kernel.h>
#include <linux/if_vlan.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/netlink.h>
#include <linux/netfilter.h>
#include <linux/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_core.h>
#include <net/netfilter/nf_tables.h>
#include <net/netfilter/nf_tables_offload.h>
/* For layer 4 checksum field offset. */
#include <linux/tcp.h>
#include <linux/udp.h>
#include <linux/icmpv6.h>
#include <linux/ip.h>
#include <linux/ipv6.h>
#include <net/sctp/checksum.h>
static bool nft_payload_rebuild_vlan_hdr(const struct sk_buff *skb, int mac_off,
struct vlan_ethhdr *veth)
{
if (skb_copy_bits(skb, mac_off, veth, ETH_HLEN))
return false;
veth->h_vlan_proto = skb->vlan_proto;
veth->h_vlan_TCI = htons(skb_vlan_tag_get(skb));
veth->h_vlan_encapsulated_proto = skb->protocol;
return true;
}
/* add vlan header into the user buffer for if tag was removed by offloads */
static bool
nft_payload_copy_vlan(u32 *d, const struct sk_buff *skb, u8 offset, u8 len)
{
int mac_off = skb_mac_header(skb) - skb->data;
u8 *vlanh, *dst_u8 = (u8 *) d;
struct vlan_ethhdr veth;
u8 vlan_hlen = 0;
if ((skb->protocol == htons(ETH_P_8021AD) ||
skb->protocol == htons(ETH_P_8021Q)) &&
offset >= VLAN_ETH_HLEN && offset < VLAN_ETH_HLEN + VLAN_HLEN)
vlan_hlen += VLAN_HLEN;
vlanh = (u8 *) &veth;
if (offset < VLAN_ETH_HLEN + vlan_hlen) {
u8 ethlen = len;
if (vlan_hlen &&
skb_copy_bits(skb, mac_off, &veth, VLAN_ETH_HLEN) < 0)
return false;
else if (!nft_payload_rebuild_vlan_hdr(skb, mac_off, &veth))
return false;
if (offset + len > VLAN_ETH_HLEN + vlan_hlen)
ethlen -= offset + len - VLAN_ETH_HLEN + vlan_hlen;
memcpy(dst_u8, vlanh + offset - vlan_hlen, ethlen);
len -= ethlen;
if (len == 0)
return true;
dst_u8 += ethlen;
offset = ETH_HLEN + vlan_hlen;
} else {
offset -= VLAN_HLEN + vlan_hlen;
}
return skb_copy_bits(skb, offset + mac_off, dst_u8, len) == 0;
}
void nft_payload_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_payload *priv = nft_expr_priv(expr);
const struct sk_buff *skb = pkt->skb;
u32 *dest = &regs->data[priv->dreg];
int offset;
if (priv->len % NFT_REG32_SIZE)
dest[priv->len / NFT_REG32_SIZE] = 0;
switch (priv->base) {
case NFT_PAYLOAD_LL_HEADER:
if (!skb_mac_header_was_set(skb))
goto err;
if (skb_vlan_tag_present(skb)) {
if (!nft_payload_copy_vlan(dest, skb,
priv->offset, priv->len))
goto err;
return;
}
offset = skb_mac_header(skb) - skb->data;
break;
case NFT_PAYLOAD_NETWORK_HEADER:
offset = skb_network_offset(skb);
break;
case NFT_PAYLOAD_TRANSPORT_HEADER:
if (!pkt->tprot_set)
goto err;
offset = pkt->xt.thoff;
break;
default:
BUG();
}
offset += priv->offset;
if (skb_copy_bits(skb, offset, dest, priv->len) < 0)
goto err;
return;
err:
regs->verdict.code = NFT_BREAK;
}
static const struct nla_policy nft_payload_policy[NFTA_PAYLOAD_MAX + 1] = {
[NFTA_PAYLOAD_SREG] = { .type = NLA_U32 },
[NFTA_PAYLOAD_DREG] = { .type = NLA_U32 },
[NFTA_PAYLOAD_BASE] = { .type = NLA_U32 },
[NFTA_PAYLOAD_OFFSET] = { .type = NLA_U32 },
[NFTA_PAYLOAD_LEN] = { .type = NLA_U32 },
[NFTA_PAYLOAD_CSUM_TYPE] = { .type = NLA_U32 },
[NFTA_PAYLOAD_CSUM_OFFSET] = { .type = NLA_U32 },
[NFTA_PAYLOAD_CSUM_FLAGS] = { .type = NLA_U32 },
};
static int nft_payload_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_payload *priv = nft_expr_priv(expr);
priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
priv->dreg = nft_parse_register(tb[NFTA_PAYLOAD_DREG]);
return nft_validate_register_store(ctx, priv->dreg, NULL,
NFT_DATA_VALUE, priv->len);
}
static int nft_payload_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_payload *priv = nft_expr_priv(expr);
if (nft_dump_register(skb, NFTA_PAYLOAD_DREG, priv->dreg) ||
nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) ||
nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) ||
nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static bool nft_payload_offload_mask(struct nft_offload_reg *reg,
u32 priv_len, u32 field_len)
{
unsigned int remainder, delta, k;
struct nft_data mask = {};
__be32 remainder_mask;
if (priv_len == field_len) {
memset(&reg->mask, 0xff, priv_len);
return true;
} else if (priv_len > field_len) {
return false;
}
memset(&mask, 0xff, field_len);
remainder = priv_len % sizeof(u32);
if (remainder) {
k = priv_len / sizeof(u32);
delta = field_len - priv_len;
remainder_mask = htonl(~((1 << (delta * BITS_PER_BYTE)) - 1));
mask.data[k] = (__force u32)remainder_mask;
}
memcpy(&reg->mask, &mask, field_len);
return true;
}
static int nft_payload_offload_ll(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
switch (priv->offset) {
case offsetof(struct ethhdr, h_source):
if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
src, ETH_ALEN, reg);
break;
case offsetof(struct ethhdr, h_dest):
if (!nft_payload_offload_mask(reg, priv->len, ETH_ALEN))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_ETH_ADDRS, eth_addrs,
dst, ETH_ALEN, reg);
break;
case offsetof(struct ethhdr, h_proto):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic,
n_proto, sizeof(__be16), reg);
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
break;
case offsetof(struct vlan_ethhdr, h_vlan_TCI):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_VLAN, vlan,
vlan_tci, sizeof(__be16), reg,
NFT_OFFLOAD_F_NETWORK2HOST);
break;
case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_VLAN, vlan,
vlan_tpid, sizeof(__be16), reg);
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
break;
case offsetof(struct vlan_ethhdr, h_vlan_TCI) + sizeof(struct vlan_hdr):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH_FLAGS(FLOW_DISSECTOR_KEY_CVLAN, cvlan,
vlan_tci, sizeof(__be16), reg,
NFT_OFFLOAD_F_NETWORK2HOST);
break;
case offsetof(struct vlan_ethhdr, h_vlan_encapsulated_proto) +
sizeof(struct vlan_hdr):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_CVLAN, cvlan,
vlan_tpid, sizeof(__be16), reg);
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_NETWORK);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int nft_payload_offload_ip(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
switch (priv->offset) {
case offsetof(struct iphdr, saddr):
if (!nft_payload_offload_mask(reg, priv->len,
sizeof(struct in_addr)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, src,
sizeof(struct in_addr), reg);
nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
break;
case offsetof(struct iphdr, daddr):
if (!nft_payload_offload_mask(reg, priv->len,
sizeof(struct in_addr)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV4_ADDRS, ipv4, dst,
sizeof(struct in_addr), reg);
nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV4_ADDRS);
break;
case offsetof(struct iphdr, protocol):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
sizeof(__u8), reg);
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int nft_payload_offload_ip6(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
switch (priv->offset) {
case offsetof(struct ipv6hdr, saddr):
if (!nft_payload_offload_mask(reg, priv->len,
sizeof(struct in6_addr)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, src,
sizeof(struct in6_addr), reg);
nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
break;
case offsetof(struct ipv6hdr, daddr):
if (!nft_payload_offload_mask(reg, priv->len,
sizeof(struct in6_addr)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_IPV6_ADDRS, ipv6, dst,
sizeof(struct in6_addr), reg);
nft_flow_rule_set_addr_type(flow, FLOW_DISSECTOR_KEY_IPV6_ADDRS);
break;
case offsetof(struct ipv6hdr, nexthdr):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__u8)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_BASIC, basic, ip_proto,
sizeof(__u8), reg);
nft_offload_set_dependency(ctx, NFT_OFFLOAD_DEP_TRANSPORT);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int nft_payload_offload_nh(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
int err;
switch (ctx->dep.l3num) {
case htons(ETH_P_IP):
err = nft_payload_offload_ip(ctx, flow, priv);
break;
case htons(ETH_P_IPV6):
err = nft_payload_offload_ip6(ctx, flow, priv);
break;
default:
return -EOPNOTSUPP;
}
return err;
}
static int nft_payload_offload_tcp(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
switch (priv->offset) {
case offsetof(struct tcphdr, source):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src,
sizeof(__be16), reg);
break;
case offsetof(struct tcphdr, dest):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst,
sizeof(__be16), reg);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int nft_payload_offload_udp(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
struct nft_offload_reg *reg = &ctx->regs[priv->dreg];
switch (priv->offset) {
case offsetof(struct udphdr, source):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, src,
sizeof(__be16), reg);
break;
case offsetof(struct udphdr, dest):
if (!nft_payload_offload_mask(reg, priv->len, sizeof(__be16)))
return -EOPNOTSUPP;
NFT_OFFLOAD_MATCH(FLOW_DISSECTOR_KEY_PORTS, tp, dst,
sizeof(__be16), reg);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int nft_payload_offload_th(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_payload *priv)
{
int err;
switch (ctx->dep.protonum) {
case IPPROTO_TCP:
err = nft_payload_offload_tcp(ctx, flow, priv);
break;
case IPPROTO_UDP:
err = nft_payload_offload_udp(ctx, flow, priv);
break;
default:
return -EOPNOTSUPP;
}
return err;
}
static int nft_payload_offload(struct nft_offload_ctx *ctx,
struct nft_flow_rule *flow,
const struct nft_expr *expr)
{
const struct nft_payload *priv = nft_expr_priv(expr);
int err;
switch (priv->base) {
case NFT_PAYLOAD_LL_HEADER:
err = nft_payload_offload_ll(ctx, flow, priv);
break;
case NFT_PAYLOAD_NETWORK_HEADER:
err = nft_payload_offload_nh(ctx, flow, priv);
break;
case NFT_PAYLOAD_TRANSPORT_HEADER:
err = nft_payload_offload_th(ctx, flow, priv);
break;
default:
err = -EOPNOTSUPP;
break;
}
return err;
}
static const struct nft_expr_ops nft_payload_ops = {
.type = &nft_payload_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_payload)),
.eval = nft_payload_eval,
.init = nft_payload_init,
.dump = nft_payload_dump,
.offload = nft_payload_offload,
};
const struct nft_expr_ops nft_payload_fast_ops = {
.type = &nft_payload_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_payload)),
.eval = nft_payload_eval,
.init = nft_payload_init,
.dump = nft_payload_dump,
.offload = nft_payload_offload,
};
static inline void nft_csum_replace(__sum16 *sum, __wsum fsum, __wsum tsum)
{
*sum = csum_fold(csum_add(csum_sub(~csum_unfold(*sum), fsum), tsum));
if (*sum == 0)
*sum = CSUM_MANGLED_0;
}
static bool nft_payload_udp_checksum(struct sk_buff *skb, unsigned int thoff)
{
struct udphdr *uh, _uh;
uh = skb_header_pointer(skb, thoff, sizeof(_uh), &_uh);
if (!uh)
return false;
return (__force bool)uh->check;
}
static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt,
struct sk_buff *skb,
unsigned int *l4csum_offset)
{
switch (pkt->tprot) {
case IPPROTO_TCP:
*l4csum_offset = offsetof(struct tcphdr, check);
break;
case IPPROTO_UDP:
if (!nft_payload_udp_checksum(skb, pkt->xt.thoff))
return -1;
fallthrough;
case IPPROTO_UDPLITE:
*l4csum_offset = offsetof(struct udphdr, check);
break;
case IPPROTO_ICMPV6:
*l4csum_offset = offsetof(struct icmp6hdr, icmp6_cksum);
break;
default:
return -1;
}
*l4csum_offset += pkt->xt.thoff;
return 0;
}
static int nft_payload_csum_sctp(struct sk_buff *skb, int offset)
{
struct sctphdr *sh;
if (skb_ensure_writable(skb, offset + sizeof(*sh)))
return -1;
sh = (struct sctphdr *)(skb->data + offset);
sh->checksum = sctp_compute_cksum(skb, offset);
skb->ip_summed = CHECKSUM_UNNECESSARY;
return 0;
}
static int nft_payload_l4csum_update(const struct nft_pktinfo *pkt,
struct sk_buff *skb,
__wsum fsum, __wsum tsum)
{
int l4csum_offset;
__sum16 sum;
/* If we cannot determine layer 4 checksum offset or this packet doesn't
* require layer 4 checksum recalculation, skip this packet.
*/
if (nft_payload_l4csum_offset(pkt, skb, &l4csum_offset) < 0)
return 0;
if (skb_copy_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0)
return -1;
/* Checksum mangling for an arbitrary amount of bytes, based on
* inet_proto_csum_replace*() functions.
*/
if (skb->ip_summed != CHECKSUM_PARTIAL) {
nft_csum_replace(&sum, fsum, tsum);
if (skb->ip_summed == CHECKSUM_COMPLETE) {
skb->csum = ~csum_add(csum_sub(~(skb->csum), fsum),
tsum);
}
} else {
sum = ~csum_fold(csum_add(csum_sub(csum_unfold(sum), fsum),
tsum));
}
if (skb_ensure_writable(skb, l4csum_offset + sizeof(sum)) ||
skb_store_bits(skb, l4csum_offset, &sum, sizeof(sum)) < 0)
return -1;
return 0;
}
static int nft_payload_csum_inet(struct sk_buff *skb, const u32 *src,
__wsum fsum, __wsum tsum, int csum_offset)
{
__sum16 sum;
if (skb_copy_bits(skb, csum_offset, &sum, sizeof(sum)) < 0)
return -1;
nft_csum_replace(&sum, fsum, tsum);
if (skb_ensure_writable(skb, csum_offset + sizeof(sum)) ||
skb_store_bits(skb, csum_offset, &sum, sizeof(sum)) < 0)
return -1;
return 0;
}
static void nft_payload_set_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
const struct nft_payload_set *priv = nft_expr_priv(expr);
struct sk_buff *skb = pkt->skb;
const u32 *src = &regs->data[priv->sreg];
int offset, csum_offset;
__wsum fsum, tsum;
switch (priv->base) {
case NFT_PAYLOAD_LL_HEADER:
if (!skb_mac_header_was_set(skb))
goto err;
offset = skb_mac_header(skb) - skb->data;
break;
case NFT_PAYLOAD_NETWORK_HEADER:
offset = skb_network_offset(skb);
break;
case NFT_PAYLOAD_TRANSPORT_HEADER:
if (!pkt->tprot_set)
goto err;
offset = pkt->xt.thoff;
break;
default:
BUG();
}
csum_offset = offset + priv->csum_offset;
offset += priv->offset;
if ((priv->csum_type == NFT_PAYLOAD_CSUM_INET || priv->csum_flags) &&
(priv->base != NFT_PAYLOAD_TRANSPORT_HEADER ||
skb->ip_summed != CHECKSUM_PARTIAL)) {
fsum = skb_checksum(skb, offset, priv->len, 0);
tsum = csum_partial(src, priv->len, 0);
if (priv->csum_type == NFT_PAYLOAD_CSUM_INET &&
nft_payload_csum_inet(skb, src, fsum, tsum, csum_offset))
goto err;
if (priv->csum_flags &&
nft_payload_l4csum_update(pkt, skb, fsum, tsum) < 0)
goto err;
}
if (skb_ensure_writable(skb, max(offset + priv->len, 0)) ||
skb_store_bits(skb, offset, src, priv->len) < 0)
goto err;
if (priv->csum_type == NFT_PAYLOAD_CSUM_SCTP &&
pkt->tprot == IPPROTO_SCTP &&
skb->ip_summed != CHECKSUM_PARTIAL) {
if (nft_payload_csum_sctp(skb, pkt->xt.thoff))
goto err;
}
return;
err:
regs->verdict.code = NFT_BREAK;
}
static int nft_payload_set_init(const struct nft_ctx *ctx,
const struct nft_expr *expr,
const struct nlattr * const tb[])
{
struct nft_payload_set *priv = nft_expr_priv(expr);
priv->base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
priv->offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
priv->len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
priv->sreg = nft_parse_register(tb[NFTA_PAYLOAD_SREG]);
if (tb[NFTA_PAYLOAD_CSUM_TYPE])
priv->csum_type =
ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_TYPE]));
if (tb[NFTA_PAYLOAD_CSUM_OFFSET])
priv->csum_offset =
ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_OFFSET]));
if (tb[NFTA_PAYLOAD_CSUM_FLAGS]) {
u32 flags;
flags = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_CSUM_FLAGS]));
if (flags & ~NFT_PAYLOAD_L4CSUM_PSEUDOHDR)
return -EINVAL;
priv->csum_flags = flags;
}
switch (priv->csum_type) {
case NFT_PAYLOAD_CSUM_NONE:
case NFT_PAYLOAD_CSUM_INET:
break;
case NFT_PAYLOAD_CSUM_SCTP:
if (priv->base != NFT_PAYLOAD_TRANSPORT_HEADER)
return -EINVAL;
if (priv->csum_offset != offsetof(struct sctphdr, checksum))
return -EINVAL;
break;
default:
return -EOPNOTSUPP;
}
return nft_validate_register_load(priv->sreg, priv->len);
}
static int nft_payload_set_dump(struct sk_buff *skb, const struct nft_expr *expr)
{
const struct nft_payload_set *priv = nft_expr_priv(expr);
if (nft_dump_register(skb, NFTA_PAYLOAD_SREG, priv->sreg) ||
nla_put_be32(skb, NFTA_PAYLOAD_BASE, htonl(priv->base)) ||
nla_put_be32(skb, NFTA_PAYLOAD_OFFSET, htonl(priv->offset)) ||
nla_put_be32(skb, NFTA_PAYLOAD_LEN, htonl(priv->len)) ||
nla_put_be32(skb, NFTA_PAYLOAD_CSUM_TYPE, htonl(priv->csum_type)) ||
nla_put_be32(skb, NFTA_PAYLOAD_CSUM_OFFSET,
htonl(priv->csum_offset)) ||
nla_put_be32(skb, NFTA_PAYLOAD_CSUM_FLAGS, htonl(priv->csum_flags)))
goto nla_put_failure;
return 0;
nla_put_failure:
return -1;
}
static const struct nft_expr_ops nft_payload_set_ops = {
.type = &nft_payload_type,
.size = NFT_EXPR_SIZE(sizeof(struct nft_payload_set)),
.eval = nft_payload_set_eval,
.init = nft_payload_set_init,
.dump = nft_payload_set_dump,
};
static const struct nft_expr_ops *
nft_payload_select_ops(const struct nft_ctx *ctx,
const struct nlattr * const tb[])
{
enum nft_payload_bases base;
unsigned int offset, len;
if (tb[NFTA_PAYLOAD_BASE] == NULL ||
tb[NFTA_PAYLOAD_OFFSET] == NULL ||
tb[NFTA_PAYLOAD_LEN] == NULL)
return ERR_PTR(-EINVAL);
base = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_BASE]));
switch (base) {
case NFT_PAYLOAD_LL_HEADER:
case NFT_PAYLOAD_NETWORK_HEADER:
case NFT_PAYLOAD_TRANSPORT_HEADER:
break;
default:
return ERR_PTR(-EOPNOTSUPP);
}
if (tb[NFTA_PAYLOAD_SREG] != NULL) {
if (tb[NFTA_PAYLOAD_DREG] != NULL)
return ERR_PTR(-EINVAL);
return &nft_payload_set_ops;
}
if (tb[NFTA_PAYLOAD_DREG] == NULL)
return ERR_PTR(-EINVAL);
offset = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_OFFSET]));
len = ntohl(nla_get_be32(tb[NFTA_PAYLOAD_LEN]));
if (len <= 4 && is_power_of_2(len) && IS_ALIGNED(offset, len) &&
base != NFT_PAYLOAD_LL_HEADER)
return &nft_payload_fast_ops;
else
return &nft_payload_ops;
}
struct nft_expr_type nft_payload_type __read_mostly = {
.name = "payload",
.select_ops = nft_payload_select_ops,
.policy = nft_payload_policy,
.maxattr = NFTA_PAYLOAD_MAX,
.owner = THIS_MODULE,
};