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[IPV4]: Add ip_local_out

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Most callers of the LOCAL_OUT chain will set the IP packet length and
header checksum before doing so.  They also share the same output
function dst_output.

This patch creates a new function called ip_local_out which does all
of that and converts the appropriate users over to it.

Apart from removing duplicate code, it will also help in merging the
IPsec output path once the same thing is done for IPv6.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu 2008-01-11 19:14:00 -08:00 committed by David S. Miller
parent 227620e295
commit c439cb2e4b
7 changed files with 35 additions and 45 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/net/ip.h
View File

@ -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,

5
include/net/ipip.h
View File

@ -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++; \

12
net/ipv4/igmp.c
View File

@ -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)

39
net/ipv4/ip_output.c
View File

@ -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;

6
net/ipv4/ipvs/ip_vs_xmit.c
View File

@ -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);

8
net/ipv4/netfilter/ipt_REJECT.c
View File

@ -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:

8
net/ipv4/xfrm4_output.c
View File

@ -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;