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-rw-r--r--include/net/ip.h2
-rw-r--r--include/net/ipip.h5
-rw-r--r--net/ipv4/igmp.c12
-rw-r--r--net/ipv4/ip_output.c39
-rw-r--r--net/ipv4/ipvs/ip_vs_xmit.c6
-rw-r--r--net/ipv4/netfilter/ipt_REJECT.c8
-rw-r--r--net/ipv4/xfrm4_output.c8
7 files changed, 35 insertions, 45 deletions
diff --git a/include/net/ip.h b/include/net/ip.h
index 50c8889b1b8d..66d51616ade8 100644
--- a/include/net/ip.h
+++ b/include/net/ip.h
@@ -102,6 +102,8 @@ extern int ip_mc_output(struct sk_buff *skb);
extern int ip_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *));
extern int ip_do_nat(struct sk_buff *skb);
extern void ip_send_check(struct iphdr *ip);
+extern int __ip_local_out(struct sk_buff *skb);
+extern int ip_local_out(struct sk_buff *skb);
extern int ip_queue_xmit(struct sk_buff *skb, int ipfragok);
extern void ip_init(void);
extern int ip_append_data(struct sock *sk,
diff --git a/include/net/ipip.h b/include/net/ipip.h
index 7cdc914322f0..549e132bca9c 100644
--- a/include/net/ipip.h
+++ b/include/net/ipip.h
@@ -2,6 +2,7 @@
#define __NET_IPIP_H 1
#include <linux/if_tunnel.h>
+#include <net/ip.h>
/* Keep error state on tunnel for 30 sec */
#define IPTUNNEL_ERR_TIMEO (30*HZ)
@@ -30,11 +31,9 @@ struct ip_tunnel
int pkt_len = skb->len; \
\
skb->ip_summed = CHECKSUM_NONE; \
- iph->tot_len = htons(skb->len); \
ip_select_ident(iph, &rt->u.dst, NULL); \
- ip_send_check(iph); \
\
- err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev, dst_output);\
+ err = ip_local_out(skb); \
if (net_xmit_eval(err) == 0) { \
stats->tx_bytes += pkt_len; \
stats->tx_packets++; \
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 701558564e96..c560a9392b1d 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -349,17 +349,12 @@ static struct sk_buff *igmpv3_newpack(struct net_device *dev, int size)
static int igmpv3_sendpack(struct sk_buff *skb)
{
- struct iphdr *pip = ip_hdr(skb);
struct igmphdr *pig = igmp_hdr(skb);
- const int iplen = skb->tail - skb->network_header;
const int igmplen = skb->tail - skb->transport_header;
- pip->tot_len = htons(iplen);
- ip_send_check(pip);
pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
- return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dev,
- dst_output);
+ return ip_local_out(skb);
}
static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
@@ -680,13 +675,11 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
iph->daddr = dst;
iph->saddr = rt->rt_src;
iph->protocol = IPPROTO_IGMP;
- iph->tot_len = htons(IGMP_SIZE);
ip_select_ident(iph, &rt->u.dst, NULL);
((u8*)&iph[1])[0] = IPOPT_RA;
((u8*)&iph[1])[1] = 4;
((u8*)&iph[1])[2] = 0;
((u8*)&iph[1])[3] = 0;
- ip_send_check(iph);
ih = (struct igmphdr *)skb_put(skb, sizeof(struct igmphdr));
ih->type=type;
@@ -695,8 +688,7 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
ih->group=group;
ih->csum=ip_compute_csum((void *)ih, sizeof(struct igmphdr));
- return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
- dst_output);
+ return ip_local_out(skb);
}
static void igmp_gq_timer_expire(unsigned long data)
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index bc9e57550e86..03b9b0600276 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -91,6 +91,28 @@ __inline__ void ip_send_check(struct iphdr *iph)
iph->check = ip_fast_csum((unsigned char *)iph, iph->ihl);
}
+int __ip_local_out(struct sk_buff *skb)
+{
+ struct iphdr *iph = ip_hdr(skb);
+
+ iph->tot_len = htons(skb->len);
+ ip_send_check(iph);
+ return nf_hook(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, skb->dst->dev,
+ dst_output);
+}
+
+int ip_local_out(struct sk_buff *skb)
+{
+ int err;
+
+ err = __ip_local_out(skb);
+ if (likely(err == 1))
+ err = dst_output(skb);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(ip_local_out);
+
/* dev_loopback_xmit for use with netfilter. */
static int ip_dev_loopback_xmit(struct sk_buff *newskb)
{
@@ -138,20 +160,17 @@ int ip_build_and_send_pkt(struct sk_buff *skb, struct sock *sk,
iph->daddr = rt->rt_dst;
iph->saddr = rt->rt_src;
iph->protocol = sk->sk_protocol;
- iph->tot_len = htons(skb->len);
ip_select_ident(iph, &rt->u.dst, sk);
if (opt && opt->optlen) {
iph->ihl += opt->optlen>>2;
ip_options_build(skb, opt, daddr, rt, 0);
}
- ip_send_check(iph);
skb->priority = sk->sk_priority;
/* Send it out. */
- return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
- dst_output);
+ return ip_local_out(skb);
}
EXPORT_SYMBOL_GPL(ip_build_and_send_pkt);
@@ -347,7 +366,6 @@ packet_routed:
skb_reset_network_header(skb);
iph = ip_hdr(skb);
*((__be16 *)iph) = htons((4 << 12) | (5 << 8) | (inet->tos & 0xff));
- iph->tot_len = htons(skb->len);
if (ip_dont_fragment(sk, &rt->u.dst) && !ipfragok)
iph->frag_off = htons(IP_DF);
else
@@ -366,13 +384,9 @@ packet_routed:
ip_select_ident_more(iph, &rt->u.dst, sk,
(skb_shinfo(skb)->gso_segs ?: 1) - 1);
- /* Add an IP checksum. */
- ip_send_check(iph);
-
skb->priority = sk->sk_priority;
- return NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL, rt->u.dst.dev,
- dst_output);
+ return ip_local_out(skb);
no_route:
IP_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
@@ -1262,14 +1276,12 @@ int ip_push_pending_frames(struct sock *sk)
ip_options_build(skb, opt, inet->cork.addr, rt, 0);
}
iph->tos = inet->tos;
- iph->tot_len = htons(skb->len);
iph->frag_off = df;
ip_select_ident(iph, &rt->u.dst, sk);
iph->ttl = ttl;
iph->protocol = sk->sk_protocol;
iph->saddr = rt->rt_src;
iph->daddr = rt->rt_dst;
- ip_send_check(iph);
skb->priority = sk->sk_priority;
skb->dst = dst_clone(&rt->u.dst);
@@ -1279,8 +1291,7 @@ int ip_push_pending_frames(struct sock *sk)
skb_transport_header(skb))->type);
/* Netfilter gets whole the not fragmented skb. */
- err = NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, skb, NULL,
- skb->dst->dev, dst_output);
+ err = ip_local_out(skb);
if (err) {
if (err > 0)
err = inet->recverr ? net_xmit_errno(err) : 0;
diff --git a/net/ipv4/ipvs/ip_vs_xmit.c b/net/ipv4/ipvs/ip_vs_xmit.c
index 7c074e386c17..66775ad9e328 100644
--- a/net/ipv4/ipvs/ip_vs_xmit.c
+++ b/net/ipv4/ipvs/ip_vs_xmit.c
@@ -16,8 +16,8 @@
*/
#include <linux/kernel.h>
-#include <linux/ip.h>
#include <linux/tcp.h> /* for tcphdr */
+#include <net/ip.h>
#include <net/tcp.h> /* for csum_tcpudp_magic */
#include <net/udp.h>
#include <net/icmp.h> /* for icmp_send */
@@ -406,14 +406,12 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
iph->daddr = rt->rt_dst;
iph->saddr = rt->rt_src;
iph->ttl = old_iph->ttl;
- iph->tot_len = htons(skb->len);
ip_select_ident(iph, &rt->u.dst, NULL);
- ip_send_check(iph);
/* Another hack: avoid icmp_send in ip_fragment */
skb->local_df = 1;
- IP_VS_XMIT(skb, rt);
+ ip_local_out(skb);
LeaveFunction(10);
diff --git a/net/ipv4/netfilter/ipt_REJECT.c b/net/ipv4/netfilter/ipt_REJECT.c
index dcf4d21d5116..ccb2a03dcd5a 100644
--- a/net/ipv4/netfilter/ipt_REJECT.c
+++ b/net/ipv4/netfilter/ipt_REJECT.c
@@ -90,7 +90,6 @@ static void send_reset(struct sk_buff *oldskb, int hook)
/* Truncate to length (no data) */
tcph->doff = sizeof(struct tcphdr)/4;
skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr));
- niph->tot_len = htons(nskb->len);
if (tcph->ack) {
needs_ack = 0;
@@ -139,18 +138,13 @@ static void send_reset(struct sk_buff *oldskb, int hook)
/* Adjust IP TTL */
niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT);
- /* Adjust IP checksum */
- niph->check = 0;
- niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl);
-
/* "Never happens" */
if (nskb->len > dst_mtu(nskb->dst))
goto free_nskb;
nf_ct_attach(nskb, oldskb);
- NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev,
- dst_output);
+ ip_local_out(nskb);
return;
free_nskb:
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index 13fd11335e28..0ffc3d078489 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -69,17 +69,12 @@ EXPORT_SYMBOL(xfrm4_prepare_output);
static inline int xfrm4_output_one(struct sk_buff *skb)
{
- struct iphdr *iph;
int err;
err = xfrm_output(skb);
if (err)
goto error_nolock;
- iph = ip_hdr(skb);
- iph->tot_len = htons(skb->len);
- ip_send_check(iph);
-
IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
err = 0;
@@ -97,8 +92,7 @@ static int xfrm4_output_finish2(struct sk_buff *skb)
while (likely((err = xfrm4_output_one(skb)) == 0)) {
nf_reset(skb);
- err = nf_hook(PF_INET, NF_IP_LOCAL_OUT, skb, NULL,
- skb->dst->dev, dst_output);
+ err = __ip_local_out(skb);
if (unlikely(err != 1))
break;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.