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netfilter: use actual socket sk for REJECT action 

True to the message of commit v5.10-rc1-105-g46d6c5ae953c, _do_
actually make use of state->sk when possible, such as in the REJECT
modules.

Reported-by: Minqiang Chen <ptpt52@gmail.com>
Cc: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Jan Engelhardt <jengelh@inai.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Jan Engelhardt 2020-11-21 12:11:51 +01:00 committed by Pablo Neira Ayuso
parent f7583f02a5
commit 04295878be
9 changed files with 21 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/netfilter/ipv4/nf_reject.h
View File

@ -8,8 +8,8 @@
#include <net/netfilter/nf_reject.h>
void nf_send_unreach(struct sk_buff *skb_in, int code, int hook);
void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook);
void nf_send_reset(struct net *net, struct sock *, struct sk_buff *oldskb,
int hook);
const struct tcphdr *nf_reject_ip_tcphdr_get(struct sk_buff *oldskb,
struct tcphdr *_oth, int hook);
struct iphdr *nf_reject_iphdr_put(struct sk_buff *nskb,

5
include/net/netfilter/ipv6/nf_reject.h
View File

@ -7,9 +7,8 @@
void nf_send_unreach6(struct net *net, struct sk_buff *skb_in, unsigned char code,
unsigned int hooknum);
void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook);
void nf_send_reset6(struct net *net, struct sock *sk, struct sk_buff *oldskb,
int hook);
const struct tcphdr *nf_reject_ip6_tcphdr_get(struct sk_buff *oldskb,
struct tcphdr *otcph,
unsigned int *otcplen, int hook);

3
net/ipv4/netfilter/ipt_REJECT.c
View File

@ -56,7 +56,8 @@ reject_tg(struct sk_buff *skb, const struct xt_action_param *par)
nf_send_unreach(skb, ICMP_PKT_FILTERED, hook);
break;
case IPT_TCP_RESET:
nf_send_reset(xt_net(par), skb, hook);
nf_send_reset(xt_net(par), par->state->sk, skb, hook);
break;
case IPT_ICMP_ECHOREPLY:
/* Doesn't happen. */
break;

6
net/ipv4/netfilter/nf_reject_ipv4.c
View File

@ -234,7 +234,8 @@ static int nf_reject_fill_skb_dst(struct sk_buff *skb_in)
}
/* Send RST reply */
void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
void nf_send_reset(struct net *net, struct sock *sk, struct sk_buff *oldskb,
int hook)
{
struct net_device *br_indev __maybe_unused;
struct sk_buff *nskb;
@ -267,8 +268,7 @@ void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
niph = nf_reject_iphdr_put(nskb, oldskb, IPPROTO_TCP,
ip4_dst_hoplimit(skb_dst(nskb)));
nf_reject_ip_tcphdr_put(nskb, oldskb, oth);
if (ip_route_me_harder(net, nskb->sk, nskb, RTN_UNSPEC))
if (ip_route_me_harder(net, sk, nskb, RTN_UNSPEC))
goto free_nskb;
niph = ip_hdr(nskb);

3
net/ipv4/netfilter/nft_reject_ipv4.c
View File

@ -27,7 +27,8 @@ static void nft_reject_ipv4_eval(const struct nft_expr *expr,
nf_send_unreach(pkt->skb, priv->icmp_code, nft_hook(pkt));
break;
case NFT_REJECT_TCP_RST:
nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
nf_send_reset(nft_net(pkt), pkt->xt.state->sk, pkt->skb,
nft_hook(pkt));
break;
default:
break;

2
net/ipv6/netfilter/ip6t_REJECT.c
View File

@ -61,7 +61,7 @@ reject_tg6(struct sk_buff *skb, const struct xt_action_param *par)
/* Do nothing */
break;
case IP6T_TCP_RESET:
nf_send_reset6(net, skb, xt_hooknum(par));
nf_send_reset6(net, par->state->sk, skb, xt_hooknum(par));
break;
case IP6T_ICMP6_POLICY_FAIL:
nf_send_unreach6(net, skb, ICMPV6_POLICY_FAIL, xt_hooknum(par));

5
net/ipv6/netfilter/nf_reject_ipv6.c
View File

@ -275,7 +275,8 @@ static int nf_reject6_fill_skb_dst(struct sk_buff *skb_in)
return 0;
}
void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
void nf_send_reset6(struct net *net, struct sock *sk, struct sk_buff *oldskb,
int hook)
{
struct net_device *br_indev __maybe_unused;
struct sk_buff *nskb;
@ -367,7 +368,7 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
dev_queue_xmit(nskb);
} else
#endif
ip6_local_out(net, nskb->sk, nskb);
ip6_local_out(net, sk, nskb);
}
EXPORT_SYMBOL_GPL(nf_send_reset6);

3
net/ipv6/netfilter/nft_reject_ipv6.c
View File

@ -28,7 +28,8 @@ static void nft_reject_ipv6_eval(const struct nft_expr *expr,
nft_hook(pkt));
break;
case NFT_REJECT_TCP_RST:
nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
nf_send_reset6(nft_net(pkt), pkt->xt.state->sk, pkt->skb,
nft_hook(pkt));
break;
default:
break;

6
net/netfilter/nft_reject_inet.c
View File

@ -28,7 +28,8 @@ static void nft_reject_inet_eval(const struct nft_expr *expr,
nft_hook(pkt));
break;
case NFT_REJECT_TCP_RST:
nf_send_reset(nft_net(pkt), pkt->skb, nft_hook(pkt));
nf_send_reset(nft_net(pkt), pkt->xt.state->sk,
pkt->skb, nft_hook(pkt));
break;
case NFT_REJECT_ICMPX_UNREACH:
nf_send_unreach(pkt->skb,
@ -44,7 +45,8 @@ static void nft_reject_inet_eval(const struct nft_expr *expr,
priv->icmp_code, nft_hook(pkt));
break;
case NFT_REJECT_TCP_RST:
nf_send_reset6(nft_net(pkt), pkt->skb, nft_hook(pkt));
nf_send_reset6(nft_net(pkt), pkt->xt.state->sk,
pkt->skb, nft_hook(pkt));
break;
case NFT_REJECT_ICMPX_UNREACH:
nf_send_unreach6(nft_net(pkt), pkt->skb,