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netfilter: nf_tables: add and use nft_thoff helper

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This allows to change storage placement later on without changing readers.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2021-05-28 12:30:06 +02:00 committed by Pablo Neira Ayuso
parent 85554eb981
commit 2d7b4ace07
8 changed files with 23 additions and 18 deletions
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5
include/net/netfilter/nf_tables.h
View File

@ -34,6 +34,11 @@ static inline struct sock *nft_sk(const struct nft_pktinfo *pkt)
return pkt->xt.state->sk;
}
static inline unsigned int nft_thoff(const struct nft_pktinfo *pkt)
{
return pkt->xt.thoff;
}
static inline struct net *nft_net(const struct nft_pktinfo *pkt)
{
return pkt->xt.state->net;

2
net/netfilter/nf_tables_core.c
View File

@ -81,7 +81,7 @@ static bool nft_payload_fast_eval(const struct nft_expr *expr,
else {
if (!pkt->tprot_set)
return false;
ptr = skb_network_header(skb) + pkt->xt.thoff;
ptr = skb_network_header(skb) + nft_thoff(pkt);
}
ptr += priv->offset;

6
net/netfilter/nf_tables_trace.c
View File

@ -113,17 +113,17 @@ static int nf_trace_fill_pkt_info(struct sk_buff *nlskb,
int off = skb_network_offset(skb);
unsigned int len, nh_end;
nh_end = pkt->tprot_set ? pkt->xt.thoff : skb->len;
nh_end = pkt->tprot_set ? nft_thoff(pkt) : skb->len;
len = min_t(unsigned int, nh_end - skb_network_offset(skb),
NFT_TRACETYPE_NETWORK_HSIZE);
if (trace_fill_header(nlskb, NFTA_TRACE_NETWORK_HEADER, skb, off, len))
return -1;
if (pkt->tprot_set) {
len = min_t(unsigned int, skb->len - pkt->xt.thoff,
len = min_t(unsigned int, skb->len - nft_thoff(pkt),
NFT_TRACETYPE_TRANSPORT_HSIZE);
if (trace_fill_header(nlskb, NFTA_TRACE_TRANSPORT_HEADER, skb,
pkt->xt.thoff, len))
nft_thoff(pkt), len))
return -1;
}

8
net/netfilter/nft_exthdr.c
View File

@ -167,7 +167,7 @@ nft_tcp_header_pointer(const struct nft_pktinfo *pkt,
if (!pkt->tprot_set || pkt->tprot != IPPROTO_TCP)
return NULL;
tcph = skb_header_pointer(pkt->skb, pkt->xt.thoff, sizeof(*tcph), buffer);
tcph = skb_header_pointer(pkt->skb, nft_thoff(pkt), sizeof(*tcph), buffer);
if (!tcph)
return NULL;
@ -175,7 +175,7 @@ nft_tcp_header_pointer(const struct nft_pktinfo *pkt,
if (*tcphdr_len < sizeof(*tcph) || *tcphdr_len > len)
return NULL;
return skb_header_pointer(pkt->skb, pkt->xt.thoff, *tcphdr_len, buffer);
return skb_header_pointer(pkt->skb, nft_thoff(pkt), *tcphdr_len, buffer);
}
static void nft_exthdr_tcp_eval(const struct nft_expr *expr,
@ -251,7 +251,7 @@ static void nft_exthdr_tcp_set_eval(const struct nft_expr *expr,
return;
if (skb_ensure_writable(pkt->skb,
pkt->xt.thoff + i + priv->len))
nft_thoff(pkt) + i + priv->len))
return;
tcph = nft_tcp_header_pointer(pkt, sizeof(buff), buff,
@ -306,7 +306,7 @@ static void nft_exthdr_sctp_eval(const struct nft_expr *expr,
struct nft_regs *regs,
const struct nft_pktinfo *pkt)
{
unsigned int offset = pkt->xt.thoff + sizeof(struct sctphdr);
unsigned int offset = nft_thoff(pkt) + sizeof(struct sctphdr);
struct nft_exthdr *priv = nft_expr_priv(expr);
u32 *dest = &regs->data[priv->dreg];
const struct sctp_chunkhdr *sch;

2
net/netfilter/nft_flow_offload.c
View File

@ -291,7 +291,7 @@ static void nft_flow_offload_eval(const struct nft_expr *expr,
switch (ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum) {
case IPPROTO_TCP:
tcph = skb_header_pointer(pkt->skb, pkt->xt.thoff,
tcph = skb_header_pointer(pkt->skb, nft_thoff(pkt),
sizeof(_tcph), &_tcph);
if (unlikely(!tcph || tcph->fin || tcph->rst))
goto out;

10
net/netfilter/nft_payload.c
View File

@ -110,7 +110,7 @@ void nft_payload_eval(const struct nft_expr *expr,
case NFT_PAYLOAD_TRANSPORT_HEADER:
if (!pkt->tprot_set)
goto err;
offset = pkt->xt.thoff;
offset = nft_thoff(pkt);
break;
default:
BUG();
@ -507,7 +507,7 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt,
*l4csum_offset = offsetof(struct tcphdr, check);
break;
case IPPROTO_UDP:
if (!nft_payload_udp_checksum(skb, pkt->xt.thoff))
if (!nft_payload_udp_checksum(skb, nft_thoff(pkt)))
return -1;
fallthrough;
case IPPROTO_UDPLITE:
@ -520,7 +520,7 @@ static int nft_payload_l4csum_offset(const struct nft_pktinfo *pkt,
return -1;
}
*l4csum_offset += pkt->xt.thoff;
*l4csum_offset += nft_thoff(pkt);
return 0;
}
@ -612,7 +612,7 @@ static void nft_payload_set_eval(const struct nft_expr *expr,
case NFT_PAYLOAD_TRANSPORT_HEADER:
if (!pkt->tprot_set)
goto err;
offset = pkt->xt.thoff;
offset = nft_thoff(pkt);
break;
default:
BUG();
@ -643,7 +643,7 @@ static void nft_payload_set_eval(const struct nft_expr *expr,
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))
if (nft_payload_csum_sctp(skb, nft_thoff(pkt)))
goto err;
}

4
net/netfilter/nft_synproxy.c
View File

@ -109,7 +109,7 @@ static void nft_synproxy_do_eval(const struct nft_synproxy *priv,
{
struct synproxy_options opts = {};
struct sk_buff *skb = pkt->skb;
int thoff = pkt->xt.thoff;
int thoff = nft_thoff(pkt);
const struct tcphdr *tcp;
struct tcphdr _tcph;
@ -123,7 +123,7 @@ static void nft_synproxy_do_eval(const struct nft_synproxy *priv,
return;
}
tcp = skb_header_pointer(skb, pkt->xt.thoff,
tcp = skb_header_pointer(skb, thoff,
sizeof(struct tcphdr),
&_tcph);
if (!tcp) {

4
net/netfilter/nft_tproxy.c
View File

@ -82,9 +82,9 @@ static void nft_tproxy_eval_v6(const struct nft_expr *expr,
const struct nft_tproxy *priv = nft_expr_priv(expr);
struct sk_buff *skb = pkt->skb;
const struct ipv6hdr *iph = ipv6_hdr(skb);
struct in6_addr taddr;
int thoff = pkt->xt.thoff;
int thoff = nft_thoff(pkt);
struct udphdr _hdr, *hp;
struct in6_addr taddr;
__be16 tport = 0;
struct sock *sk;
int l4proto;