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Merge branch 'pass_net_through_output_path'

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Eric W. Biederman says:

====================
net: Pass net through the output path v2

This is the next installment of my work to pass struct net through the
output path so the code does not need to guess how to figure out which
network namespace it is in, and ultimately routes can have output
devices in another network namespace.

The first patch in this series is a fix for a bug that came in when sk
was passed through the functions in the output path, and as such is
probably a candidate for net.  At the same time my later patches depend
on it so sending the fix separately would be confusing.

The second patch in this series is another fix that for an issue that
came in when sk was passed through the output path.  I don't think it
needs a backport as I don't think anyone uses the path where the code
was incorrect.

The rest of the patchset focuses on the path from xxx_local_out to
dst_output and in the end succeeds in passing sock_net(sk) from the
socket a packet locally originates on to the dst->output function.

Given the size reduction in the code I think this counts as a cleanup as
much as feature work.

There remain a number of helper functions (like ip option processing) to
take care of before the network stack can support destination devices in
other network namespaces but with this set of changes the backbone of
the work is done.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2015-10-08 04:27:13 -07:00
commit 6b92d0c4a6
43 changed files with 125 additions and 155 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

10
drivers/net/ipvlan/ipvlan_core.c
View file

@ -344,6 +344,7 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
{
const struct iphdr *ip4h = ip_hdr(skb);
struct net_device *dev = skb->dev;
struct net *net = dev_net(dev);
struct rtable *rt;
int err, ret = NET_XMIT_DROP;
struct flowi4 fl4 = {
@ -354,7 +355,7 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
.saddr = ip4h->saddr,
};
rt = ip_route_output_flow(dev_net(dev), &fl4, NULL);
rt = ip_route_output_flow(net, &fl4, NULL);
if (IS_ERR(rt))
goto err;
@ -364,7 +365,7 @@ static int ipvlan_process_v4_outbound(struct sk_buff *skb)
}
skb_dst_drop(skb);
skb_dst_set(skb, &rt->dst);
err = ip_local_out(skb);
err = ip_local_out(net, skb->sk, skb);
if (unlikely(net_xmit_eval(err)))
dev->stats.tx_errors++;
else
@ -381,6 +382,7 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
{
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct net_device *dev = skb->dev;
struct net *net = dev_net(dev);
struct dst_entry *dst;
int err, ret = NET_XMIT_DROP;
struct flowi6 fl6 = {
@ -393,7 +395,7 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
.flowi6_proto = ip6h->nexthdr,
};
dst = ip6_route_output(dev_net(dev), NULL, &fl6);
dst = ip6_route_output(net, NULL, &fl6);
if (dst->error) {
ret = dst->error;
dst_release(dst);
@ -401,7 +403,7 @@ static int ipvlan_process_v6_outbound(struct sk_buff *skb)
}
skb_dst_drop(skb);
skb_dst_set(skb, dst);
err = ip6_local_out(skb);
err = ip6_local_out(net, skb->sk, skb);
if (unlikely(net_xmit_eval(err)))
dev->stats.tx_errors++;
else

7
drivers/net/ppp/pptp.c
View file

@ -169,6 +169,7 @@ static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
{
struct sock *sk = (struct sock *) chan->private;
struct pppox_sock *po = pppox_sk(sk);
struct net *net = sock_net(sk);
struct pptp_opt *opt = &po->proto.pptp;
struct pptp_gre_header *hdr;
unsigned int header_len = sizeof(*hdr);
@ -187,7 +188,7 @@ static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
if (sk_pppox(po)->sk_state & PPPOX_DEAD)
goto tx_error;
rt = ip_route_output_ports(sock_net(sk), &fl4, NULL,
rt = ip_route_output_ports(net, &fl4, NULL,
opt->dst_addr.sin_addr.s_addr,
opt->src_addr.sin_addr.s_addr,
0, 0, IPPROTO_GRE,
@ -279,10 +280,10 @@ static int pptp_xmit(struct ppp_channel *chan, struct sk_buff *skb)
nf_reset(skb);
skb->ip_summed = CHECKSUM_NONE;
ip_select_ident(sock_net(sk), skb, NULL);
ip_select_ident(net, skb, NULL);
ip_send_check(iph);
ip_local_out(skb);
ip_local_out(net, skb->sk, skb);
return 1;
tx_error:

9
drivers/net/vrf.c
View file

@ -74,9 +74,9 @@ static struct dst_entry *vrf_ip_check(struct dst_entry *dst, u32 cookie)
return dst;
}
static int vrf_ip_local_out(struct sk_buff *skb)
static int vrf_ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
return ip_local_out(skb);
return ip_local_out(net, sk, skb);
}
static unsigned int vrf_v4_mtu(const struct dst_entry *dst)
@ -222,7 +222,7 @@ static netdev_tx_t vrf_process_v4_outbound(struct sk_buff *skb,
RT_SCOPE_LINK);
}
ret = ip_local_out(skb);
ret = ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
if (unlikely(net_xmit_eval(ret)))
vrf_dev->stats.tx_errors++;
else
@ -312,10 +312,9 @@ static int vrf_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
return ret;
}
static int vrf_output(struct sock *sk, struct sk_buff *skb)
static int vrf_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net_device *dev = skb_dst(skb)->dev;
struct net *net = dev_net(dev);
IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);

14
include/net/dst.h
View file

@ -45,7 +45,7 @@ struct dst_entry {
void *__pad1;
#endif
int (*input)(struct sk_buff *);
int (*output)(struct sock *sk, struct sk_buff *skb);
int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
unsigned short flags;
#define DST_HOST 0x0001
@ -365,10 +365,10 @@ static inline void skb_tunnel_rx(struct sk_buff *skb, struct net_device *dev,
__skb_tunnel_rx(skb, dev, net);
}
int dst_discard_sk(struct sock *sk, struct sk_buff *skb);
int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
static inline int dst_discard(struct sk_buff *skb)
{
return dst_discard_sk(skb->sk, skb);
return dst_discard_out(&init_net, skb->sk, skb);
}
void *dst_alloc(struct dst_ops *ops, struct net_device *dev, int initial_ref,
int initial_obsolete, unsigned short flags);
@ -454,13 +454,9 @@ static inline void dst_set_expires(struct dst_entry *dst, int timeout)
}
/* Output packet to network from transport. */
static inline int dst_output(struct sock *sk, struct sk_buff *skb)
static inline int dst_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
return skb_dst(skb)->output(sk, skb);
}
static inline int dst_output_okfn(struct net *net, struct sock *sk, struct sk_buff *skb)
{
return dst_output(sk, skb);
return skb_dst(skb)->output(net, sk, skb);
}
/* Input packet from network to transport. */

3
include/net/dst_ops.h
View file

@ -9,6 +9,7 @@ struct kmem_cachep;
struct net_device;
struct sk_buff;
struct sock;
struct net;
struct dst_ops {
unsigned short family;
@ -28,7 +29,7 @@ struct dst_ops {
struct sk_buff *skb, u32 mtu);
void (*redirect)(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb);
int (*local_out)(struct sk_buff *skb);
int (*local_out)(struct net *net, struct sock *sk, struct sk_buff *skb);
struct neighbour * (*neigh_lookup)(const struct dst_entry *dst,
struct sk_buff *skb,
const void *daddr);

12
include/net/ip.h
View file

@ -107,17 +107,13 @@ int ip_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt,
struct net_device *orig_dev);
int ip_local_deliver(struct sk_buff *skb);
int ip_mr_input(struct sk_buff *skb);
int ip_output(struct sock *sk, struct sk_buff *skb);
int ip_mc_output(struct sock *sk, struct sk_buff *skb);
int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip_do_fragment(struct net *net, struct sock *sk, struct sk_buff *skb,
int (*output)(struct net *, struct sock *, struct sk_buff *));
void ip_send_check(struct iphdr *ip);
int __ip_local_out(struct sk_buff *skb);
int ip_local_out_sk(struct sock *sk, struct sk_buff *skb);
static inline int ip_local_out(struct sk_buff *skb)
{
return ip_local_out_sk(skb->sk, skb);
}
int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl);
void ip_init(void);

2
include/net/ip6_tunnel.h
View file

@ -87,7 +87,7 @@ static inline void ip6tunnel_xmit(struct sock *sk, struct sk_buff *skb,
int pkt_len, err;
pkt_len = skb->len - skb_inner_network_offset(skb);
err = ip6_local_out_sk(sk, skb);
err = ip6_local_out(dev_net(skb_dst(skb)->dev), sk, skb);
if (net_xmit_eval(err) == 0) {
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

7
include/net/ipv6.h
View file

@ -860,14 +860,13 @@ struct dst_entry *ip6_blackhole_route(struct net *net,
* skb processing functions
*/
int ip6_output(struct sock *sk, struct sk_buff *skb);
int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip6_forward(struct sk_buff *skb);
int ip6_input(struct sk_buff *skb);
int ip6_mc_input(struct sk_buff *skb);
int __ip6_local_out(struct sk_buff *skb);
int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb);
int ip6_local_out(struct sk_buff *skb);
int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb);
/*
* Extension header (options) processing

8
include/net/lwtunnel.h
View file

@ -18,7 +18,7 @@ struct lwtunnel_state {
__u16 type;
__u16 flags;
atomic_t refcnt;
int (*orig_output)(struct sock *sk, struct sk_buff *skb);
int (*orig_output)(struct net *net, struct sock *sk, struct sk_buff *skb);
int (*orig_input)(struct sk_buff *);
int len;
__u8 data[0];
@ -28,7 +28,7 @@ struct lwtunnel_encap_ops {
int (*build_state)(struct net_device *dev, struct nlattr *encap,
unsigned int family, const void *cfg,
struct lwtunnel_state **ts);
int (*output)(struct sock *sk, struct sk_buff *skb);
int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
int (*input)(struct sk_buff *skb);
int (*fill_encap)(struct sk_buff *skb,
struct lwtunnel_state *lwtstate);
@ -88,7 +88,7 @@ int lwtunnel_fill_encap(struct sk_buff *skb,
int lwtunnel_get_encap_size(struct lwtunnel_state *lwtstate);
struct lwtunnel_state *lwtunnel_state_alloc(int hdr_len);
int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b);
int lwtunnel_output(struct sock *sk, struct sk_buff *skb);
int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int lwtunnel_input(struct sk_buff *skb);
#else
@ -160,7 +160,7 @@ static inline int lwtunnel_cmp_encap(struct lwtunnel_state *a,
return 0;
}
static inline int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
static inline int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
return -EOPNOTSUPP;
}

6
include/net/xfrm.h
View file

@ -333,7 +333,7 @@ struct xfrm_state_afinfo {
const xfrm_address_t *saddr);
int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
int (*output)(struct sock *sk, struct sk_buff *skb);
int (*output)(struct net *net, struct sock *sk, struct sk_buff *skb);
int (*output_finish)(struct sock *sk, struct sk_buff *skb);
int (*extract_input)(struct xfrm_state *x,
struct sk_buff *skb);
@ -1527,7 +1527,7 @@ static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
int xfrm4_output(struct sock *sk, struct sk_buff *skb);
int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int xfrm4_output_finish(struct sock *sk, struct sk_buff *skb);
int xfrm4_rcv_cb(struct sk_buff *skb, u8 protocol, int err);
int xfrm4_protocol_register(struct xfrm4_protocol *handler, unsigned char protocol);
@ -1552,7 +1552,7 @@ __be32 xfrm6_tunnel_alloc_spi(struct net *net, xfrm_address_t *saddr);
__be32 xfrm6_tunnel_spi_lookup(struct net *net, const xfrm_address_t *saddr);
int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
int xfrm6_output(struct sock *sk, struct sk_buff *skb);
int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb);
int xfrm6_output_finish(struct sock *sk, struct sk_buff *skb);
int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
u8 **prevhdr);

14
net/core/dst.c
View file

@ -144,12 +144,12 @@ static void dst_gc_task(struct work_struct *work)
mutex_unlock(&dst_gc_mutex);
}
int dst_discard_sk(struct sock *sk, struct sk_buff *skb)
int dst_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
kfree_skb(skb);
return 0;
}
EXPORT_SYMBOL(dst_discard_sk);
EXPORT_SYMBOL(dst_discard_out);
const u32 dst_default_metrics[RTAX_MAX + 1] = {
/* This initializer is needed to force linker to place this variable
@ -177,7 +177,7 @@ void dst_init(struct dst_entry *dst, struct dst_ops *ops,
dst->xfrm = NULL;
#endif
dst->input = dst_discard;
dst->output = dst_discard_sk;
dst->output = dst_discard_out;
dst->error = 0;
dst->obsolete = initial_obsolete;
dst->header_len = 0;
@ -224,7 +224,7 @@ static void ___dst_free(struct dst_entry *dst)
*/
if (dst->dev == NULL || !(dst->dev->flags&IFF_UP)) {
dst->input = dst_discard;
dst->output = dst_discard_sk;
dst->output = dst_discard_out;
}
dst->obsolete = DST_OBSOLETE_DEAD;
}
@ -352,7 +352,7 @@ static struct dst_ops md_dst_ops = {
.family = AF_UNSPEC,
};
static int dst_md_discard_sk(struct sock *sk, struct sk_buff *skb)
static int dst_md_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
WARN_ONCE(1, "Attempting to call output on metadata dst\n");
kfree_skb(skb);
@ -375,7 +375,7 @@ static void __metadata_dst_init(struct metadata_dst *md_dst, u8 optslen)
DST_METADATA | DST_NOCACHE | DST_NOCOUNT);
dst->input = dst_md_discard;
dst->output = dst_md_discard_sk;
dst->output = dst_md_discard_out;
memset(dst + 1, 0, sizeof(*md_dst) + optslen - sizeof(*dst));
}
@ -430,7 +430,7 @@ static void dst_ifdown(struct dst_entry *dst, struct net_device *dev,
if (!unregister) {
dst->input = dst_discard;
dst->output = dst_discard_sk;
dst->output = dst_discard_out;
} else {
dst->dev = dev_net(dst->dev)->loopback_dev;
dev_hold(dst->dev);

4
net/core/lwtunnel.c
View file

@ -180,7 +180,7 @@ int lwtunnel_cmp_encap(struct lwtunnel_state *a, struct lwtunnel_state *b)
}
EXPORT_SYMBOL(lwtunnel_cmp_encap);
int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
int lwtunnel_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
const struct lwtunnel_encap_ops *ops;
@ -199,7 +199,7 @@ int lwtunnel_output(struct sock *sk, struct sk_buff *skb)
rcu_read_lock();
ops = rcu_dereference(lwtun_encaps[lwtstate->type]);
if (likely(ops && ops->output))
ret = ops->output(sk, skb);
ret = ops->output(net, sk, skb);
rcu_read_unlock();
if (ret == -EOPNOTSUPP)

4
net/decnet/dn_nsp_out.c
View file

@ -85,7 +85,7 @@ static void dn_nsp_send(struct sk_buff *skb)
if (dst) {
try_again:
skb_dst_set(skb, dst);
dst_output(skb->sk, skb);
dst_output(&init_net, skb->sk, skb);
return;
}
@ -582,7 +582,7 @@ static __inline__ void dn_nsp_do_disc(struct sock *sk, unsigned char msgflg,
* associations.
*/
skb_dst_set(skb, dst_clone(dst));
dst_output(skb->sk, skb);
dst_output(&init_net, skb->sk, skb);
}

6
net/decnet/dn_route.c
View file

@ -744,7 +744,7 @@ int dn_route_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type
return NET_RX_DROP;
}
static int dn_output(struct sock *sk, struct sk_buff *skb)
static int dn_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
struct dn_route *rt = (struct dn_route *)dst;
@ -832,7 +832,7 @@ static int dn_forward(struct sk_buff *skb)
* Used to catch bugs. This should never normally get
* called.
*/
static int dn_rt_bug_sk(struct sock *sk, struct sk_buff *skb)
static int dn_rt_bug_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dn_skb_cb *cb = DN_SKB_CB(skb);
@ -1469,7 +1469,7 @@ static int dn_route_input_slow(struct sk_buff *skb)
rt->n = neigh;
rt->dst.lastuse = jiffies;
rt->dst.output = dn_rt_bug_sk;
rt->dst.output = dn_rt_bug_out;
switch (res.type) {
case RTN_UNICAST:
rt->dst.input = dn_forward;

4
net/ipv4/igmp.c
View file

@ -397,7 +397,7 @@ static int igmpv3_sendpack(struct sk_buff *skb)
pig->csum = ip_compute_csum(igmp_hdr(skb), igmplen);
return ip_local_out(skb);
return ip_local_out(dev_net(skb_dst(skb)->dev), skb->sk, skb);
}
static int grec_size(struct ip_mc_list *pmc, int type, int gdel, int sdel)
@ -739,7 +739,7 @@ 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 ip_local_out(skb);
return ip_local_out(net, skb->sk, skb);
}
static void igmp_gq_timer_expire(unsigned long data)

2
net/ipv4/ip_forward.c
View file

@ -72,7 +72,7 @@ static int ip_forward_finish(struct net *net, struct sock *sk, struct sk_buff *s
ip_forward_options(skb);
skb_sender_cpu_clear(skb);
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
int ip_forward(struct sk_buff *skb)

42
net/ipv4/ip_output.c
View file

@ -96,34 +96,28 @@ void ip_send_check(struct iphdr *iph)
}
EXPORT_SYMBOL(ip_send_check);
static int __ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
int __ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net *net = dev_net(skb_dst(skb)->dev);
struct iphdr *iph = ip_hdr(skb);
iph->tot_len = htons(skb->len);
ip_send_check(iph);
return nf_hook(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
net, sk, skb, NULL, skb_dst(skb)->dev,
dst_output_okfn);
dst_output);
}
int __ip_local_out(struct sk_buff *skb)
{
return __ip_local_out_sk(skb->sk, skb);
}
int ip_local_out_sk(struct sock *sk, struct sk_buff *skb)
int ip_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
int err;
err = __ip_local_out(skb);
err = __ip_local_out(net, sk, skb);
if (likely(err == 1))
err = dst_output(sk, skb);
err = dst_output(net, sk, skb);
return err;
}
EXPORT_SYMBOL_GPL(ip_local_out_sk);
EXPORT_SYMBOL_GPL(ip_local_out);
static inline int ip_select_ttl(struct inet_sock *inet, struct dst_entry *dst)
{
@ -143,6 +137,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
{
struct inet_sock *inet = inet_sk(sk);
struct rtable *rt = skb_rtable(skb);
struct net *net = sock_net(sk);
struct iphdr *iph;
/* Build the IP header. */
@ -161,7 +156,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
iph->id = 0;
} else {
iph->frag_off = 0;
__ip_select_ident(sock_net(sk), iph, 1);
__ip_select_ident(net, iph, 1);
}
if (opt && opt->opt.optlen) {
@ -173,7 +168,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
skb->mark = sk->sk_mark;
/* Send it out. */
return ip_local_out(skb);
return ip_local_out(net, skb->sk, skb);
}
EXPORT_SYMBOL_GPL(ip_build_and_send_pkt);
@ -276,7 +271,7 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk
/* Policy lookup after SNAT yielded a new policy */
if (skb_dst(skb)->xfrm) {
IPCB(skb)->flags |= IPSKB_REROUTED;
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
#endif
mtu = ip_skb_dst_mtu(skb);
@ -289,11 +284,10 @@ static int ip_finish_output(struct net *net, struct sock *sk, struct sk_buff *sk
return ip_finish_output2(net, sk, skb);
}
int ip_mc_output(struct sock *sk, struct sk_buff *skb)
int ip_mc_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct rtable *rt = skb_rtable(skb);
struct net_device *dev = rt->dst.dev;
struct net *net = dev_net(dev);
/*
* If the indicated interface is up and running, send the packet.
@ -352,10 +346,9 @@ int ip_mc_output(struct sock *sk, struct sk_buff *skb)
!(IPCB(skb)->flags & IPSKB_REROUTED));
}
int ip_output(struct sock *sk, struct sk_buff *skb)
int ip_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net_device *dev = skb_dst(skb)->dev;
struct net *net = dev_net(dev);
IP_UPD_PO_STATS(net, IPSTATS_MIB_OUT, skb->len);
@ -386,6 +379,7 @@ static void ip_copy_addrs(struct iphdr *iph, const struct flowi4 *fl4)
int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
{
struct inet_sock *inet = inet_sk(sk);
struct net *net = sock_net(sk);
struct ip_options_rcu *inet_opt;
struct flowi4 *fl4;
struct rtable *rt;
@ -416,7 +410,7 @@ int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
* keep trying until route appears or the connection times
* itself out.
*/
rt = ip_route_output_ports(sock_net(sk), fl4, sk,
rt = ip_route_output_ports(net, fl4, sk,
daddr, inet->inet_saddr,
inet->inet_dport,
inet->inet_sport,
@ -453,20 +447,20 @@ int ip_queue_xmit(struct sock *sk, struct sk_buff *skb, struct flowi *fl)
ip_options_build(skb, &inet_opt->opt, inet->inet_daddr, rt, 0);
}
ip_select_ident_segs(sock_net(sk), skb, sk,
ip_select_ident_segs(net, skb, sk,
skb_shinfo(skb)->gso_segs ?: 1);
/* TODO : should we use skb->sk here instead of sk ? */
skb->priority = sk->sk_priority;
skb->mark = sk->sk_mark;
res = ip_local_out(skb);
res = ip_local_out(net, sk, skb);
rcu_read_unlock();
return res;
no_route:
rcu_read_unlock();
IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTNOROUTES);
IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
kfree_skb(skb);
return -EHOSTUNREACH;
}
@ -1440,7 +1434,7 @@ int ip_send_skb(struct net *net, struct sk_buff *skb)
{
int err;
err = ip_local_out(skb);
err = ip_local_out(net, skb->sk, skb);
if (err) {
if (err > 0)
err = net_xmit_errno(err);

6
net/ipv4/ip_tunnel_core.c
View file

@ -53,6 +53,7 @@ int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
__u8 tos, __u8 ttl, __be16 df, bool xnet)
{
int pkt_len = skb->len - skb_inner_network_offset(skb);
struct net *net = dev_net(rt->dst.dev);
struct iphdr *iph;
int err;
@ -76,10 +77,9 @@ int iptunnel_xmit(struct sock *sk, struct rtable *rt, struct sk_buff *skb,
iph->daddr = dst;
iph->saddr = src;
iph->ttl = ttl;
__ip_select_ident(dev_net(rt->dst.dev), iph,
skb_shinfo(skb)->gso_segs ?: 1);
__ip_select_ident(net, iph, skb_shinfo(skb)->gso_segs ?: 1);
err = ip_local_out_sk(sk, skb);
err = ip_local_out(net, sk, skb);
if (unlikely(net_xmit_eval(err)))
pkt_len = 0;
return pkt_len;

2
net/ipv4/ip_vti.c
View file

@ -197,7 +197,7 @@ static netdev_tx_t vti_xmit(struct sk_buff *skb, struct net_device *dev,
skb_dst_set(skb, dst);
skb->dev = skb_dst(skb)->dev;
err = dst_output(skb->sk, skb);
err = dst_output(tunnel->net, skb->sk, skb);
if (net_xmit_eval(err) == 0)
err = skb->len;
iptunnel_xmit_stats(err, &dev->stats, dev->tstats);

2
net/ipv4/ipmr.c
View file

@ -1689,7 +1689,7 @@ static inline int ipmr_forward_finish(struct net *net, struct sock *sk,
if (unlikely(opt->optlen))
ip_forward_options(skb);
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
/*

2
net/ipv4/netfilter/ipt_SYNPROXY.c
View file

@ -63,7 +63,7 @@ synproxy_send_tcp(const struct synproxy_net *snet,
nf_conntrack_get(nfct);
}
ip_local_out(nskb);
ip_local_out(net, nskb->sk, nskb);
return;
free_nskb:

2
net/ipv4/netfilter/nf_dup_ipv4.c
View file

@ -92,7 +92,7 @@ void nf_dup_ipv4(struct net *net, struct sk_buff *skb, unsigned int hooknum,
if (nf_dup_ipv4_route(net, skb, gw, oif)) {
__this_cpu_write(nf_skb_duplicated, true);
ip_local_out(skb);
ip_local_out(net, skb->sk, skb);
__this_cpu_write(nf_skb_duplicated, false);
} else {
kfree_skb(skb);

2
net/ipv4/netfilter/nf_reject_ipv4.c
View file

@ -157,7 +157,7 @@ void nf_send_reset(struct net *net, struct sk_buff *oldskb, int hook)
dev_queue_xmit(nskb);
} else
#endif
ip_local_out(nskb);
ip_local_out(net, nskb->sk, nskb);
return;

2
net/ipv4/raw.c
View file

@ -413,7 +413,7 @@ static int raw_send_hdrinc(struct sock *sk, struct flowi4 *fl4,
err = NF_HOOK(NFPROTO_IPV4, NF_INET_LOCAL_OUT,
net, sk, skb, NULL, rt->dst.dev,
dst_output_okfn);
dst_output);
if (err > 0)
err = net_xmit_errno(err);
if (err)

4
net/ipv4/route.c
View file

@ -1152,7 +1152,7 @@ static void ipv4_link_failure(struct sk_buff *skb)
dst_set_expires(&rt->dst, 0);
}
static int ip_rt_bug(struct sock *sk, struct sk_buff *skb)
static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb)
{
pr_debug("%s: %pI4 -> %pI4, %s\n",
__func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr,
@ -2303,7 +2303,7 @@ struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_or
new->__use = 1;
new->input = dst_discard;
new->output = dst_discard_sk;
new->output = dst_discard_out;
new->dev = ort->dst.dev;
if (new->dev)

6
net/ipv4/xfrm4_output.c
View file

@ -87,17 +87,15 @@ static int __xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
#ifdef CONFIG_NETFILTER
if (!x) {
IPCB(skb)->flags |= IPSKB_REROUTED;
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
#endif
return x->outer_mode->afinfo->output_finish(sk, skb);
}
int xfrm4_output(struct sock *sk, struct sk_buff *skb)
int xfrm4_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net *net = dev_net(skb_dst(skb)->dev);
return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING,
net, sk, skb, NULL, skb_dst(skb)->dev,
__xfrm4_output,

4
net/ipv6/ila.c
View file

@ -91,7 +91,7 @@ static void update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
*(__be64 *)&ip6h->daddr = p->locator;
}
static int ila_output(struct sock *sk, struct sk_buff *skb)
static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct dst_entry *dst = skb_dst(skb);
@ -100,7 +100,7 @@ static int ila_output(struct sock *sk, struct sk_buff *skb)
update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
return dst->lwtstate->orig_output(sk, skb);
return dst->lwtstate->orig_output(net, sk, skb);
drop:
kfree_skb(skb);

9
net/ipv6/ip6_output.c
View file

@ -130,11 +130,10 @@ static int ip6_finish_output(struct net *net, struct sock *sk, struct sk_buff *s
return ip6_finish_output2(net, sk, skb);
}
int ip6_output(struct sock *sk, struct sk_buff *skb)
int ip6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net_device *dev = skb_dst(skb)->dev;
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
struct net *net = dev_net(dev);
if (unlikely(idev->cnf.disable_ipv6)) {
IP6_INC_STATS(net, idev, IPSTATS_MIB_OUTDISCARDS);
@ -233,7 +232,7 @@ int ip6_xmit(const struct sock *sk, struct sk_buff *skb, struct flowi6 *fl6,
*/
return NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
net, (struct sock *)sk, skb, NULL, dst->dev,
dst_output_okfn);
dst_output);
}
skb->dev = dst->dev;
@ -333,7 +332,7 @@ static inline int ip6_forward_finish(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
skb_sender_cpu_clear(skb);
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
static unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
@ -1692,7 +1691,7 @@ int ip6_send_skb(struct sk_buff *skb)
struct rt6_info *rt = (struct rt6_info *)skb_dst(skb);
int err;
err = ip6_local_out(skb);
err = ip6_local_out(net, skb->sk, skb);
if (err) {
if (err > 0)
err = net_xmit_errno(err);

2
net/ipv6/ip6_vti.c
View file

@ -482,7 +482,7 @@ vti6_xmit(struct sk_buff *skb, struct net_device *dev, struct flowi *fl)
return -EMSGSIZE;
}
err = dst_output(skb->sk, skb);
err = dst_output(t->net, skb->sk, skb);
if (net_xmit_eval(err) == 0) {
struct pcpu_sw_netstats *tstats = this_cpu_ptr(dev->tstats);

2
net/ipv6/ip6mr.c
View file

@ -1991,7 +1991,7 @@ static inline int ip6mr_forward2_finish(struct net *net, struct sock *sk, struct
IPSTATS_MIB_OUTFORWDATAGRAMS);
IP6_ADD_STATS_BH(net, ip6_dst_idev(skb_dst(skb)),
IPSTATS_MIB_OUTOCTETS, skb->len);
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
/*

4
net/ipv6/mcast.c
View file

@ -1646,7 +1646,7 @@ static void mld_sendpack(struct sk_buff *skb)
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
net, net->ipv6.igmp_sk, skb, NULL, skb->dev,
dst_output_okfn);
dst_output);
out:
if (!err) {
ICMP6MSGOUT_INC_STATS(net, idev, ICMPV6_MLD2_REPORT);
@ -2010,7 +2010,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
skb_dst_set(skb, dst);
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
net, sk, skb, NULL, skb->dev,
dst_output_okfn);
dst_output);
out:
if (!err) {
ICMP6MSGOUT_INC_STATS(net, idev, type);

2
net/ipv6/ndisc.c
View file

@ -465,7 +465,7 @@ static void ndisc_send_skb(struct sk_buff *skb,
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
net, sk, skb, NULL, dst->dev,
dst_output_okfn);
dst_output);
if (!err) {
ICMP6MSGOUT_INC_STATS(net, idev, type);
ICMP6_INC_STATS(net, idev, ICMP6_MIB_OUTMSGS);

2
net/ipv6/netfilter/ip6t_SYNPROXY.c
View file

@ -76,7 +76,7 @@ synproxy_send_tcp(const struct synproxy_net *snet,
nf_conntrack_get(nfct);
}
ip6_local_out(nskb);
ip6_local_out(net, nskb->sk, nskb);
return;
free_nskb:

2
net/ipv6/netfilter/nf_dup_ipv6.c
View file

@ -68,7 +68,7 @@ void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum,
}
if (nf_dup_ipv6_route(net, skb, gw, oif)) {
__this_cpu_write(nf_skb_duplicated, true);
ip6_local_out(skb);
ip6_local_out(net, skb->sk, skb);
__this_cpu_write(nf_skb_duplicated, false);
} else {
kfree_skb(skb);

2
net/ipv6/netfilter/nf_reject_ipv6.c
View file

@ -206,7 +206,7 @@ void nf_send_reset6(struct net *net, struct sk_buff *oldskb, int hook)
dev_queue_xmit(nskb);
} else
#endif
ip6_local_out(nskb);
ip6_local_out(net, nskb->sk, nskb);
}
EXPORT_SYMBOL_GPL(nf_send_reset6);

22
net/ipv6/output_core.c
View file

@ -138,9 +138,8 @@ int ip6_dst_hoplimit(struct dst_entry *dst)
EXPORT_SYMBOL(ip6_dst_hoplimit);
#endif
static int __ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
int __ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net *net = dev_net(skb_dst(skb)->dev);
int len;
len = skb->len - sizeof(struct ipv6hdr);
@ -151,29 +150,18 @@ static int __ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT,
net, sk, skb, NULL, skb_dst(skb)->dev,
dst_output_okfn);
}
int __ip6_local_out(struct sk_buff *skb)
{
return __ip6_local_out_sk(skb->sk, skb);
dst_output);
}
EXPORT_SYMBOL_GPL(__ip6_local_out);
int ip6_local_out_sk(struct sock *sk, struct sk_buff *skb)
int ip6_local_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
int err;
err = __ip6_local_out_sk(sk, skb);
err = __ip6_local_out(net, sk, skb);
if (likely(err == 1))
err = dst_output(sk, skb);
err = dst_output(net, sk, skb);
return err;
}
EXPORT_SYMBOL_GPL(ip6_local_out_sk);
int ip6_local_out(struct sk_buff *skb)
{
return ip6_local_out_sk(skb->sk, skb);
}
EXPORT_SYMBOL_GPL(ip6_local_out);

2
net/ipv6/raw.c
View file

@ -655,7 +655,7 @@ static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
NULL, rt->dst.dev, dst_output_okfn);
NULL, rt->dst.dev, dst_output);
if (err > 0)
err = net_xmit_errno(err);
if (err)

14
net/ipv6/route.c
View file

@ -86,9 +86,9 @@ static void ip6_dst_ifdown(struct dst_entry *,
static int ip6_dst_gc(struct dst_ops *ops);
static int ip6_pkt_discard(struct sk_buff *skb);
static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb);
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
static int ip6_pkt_prohibit(struct sk_buff *skb);
static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb);
static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
static void ip6_link_failure(struct sk_buff *skb);
static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
struct sk_buff *skb, u32 mtu);
@ -308,7 +308,7 @@ static const struct rt6_info ip6_blk_hole_entry_template = {
.obsolete = DST_OBSOLETE_FORCE_CHK,
.error = -EINVAL,
.input = dst_discard,
.output = dst_discard_sk,
.output = dst_discard_out,
},
.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
.rt6i_protocol = RTPROT_KERNEL,
@ -1195,7 +1195,7 @@ struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_ori
new->__use = 1;
new->input = dst_discard;
new->output = dst_discard_sk;
new->output = dst_discard_out;
if (dst_metrics_read_only(&ort->dst))
new->_metrics = ort->dst._metrics;
@ -1853,7 +1853,7 @@ int ip6_route_info_create(struct fib6_config *cfg, struct rt6_info **rt_ret)
switch (cfg->fc_type) {
case RTN_BLACKHOLE:
rt->dst.error = -EINVAL;
rt->dst.output = dst_discard_sk;
rt->dst.output = dst_discard_out;
rt->dst.input = dst_discard;
break;
case RTN_PROHIBIT:
@ -2446,7 +2446,7 @@ static int ip6_pkt_discard(struct sk_buff *skb)
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
}
static int ip6_pkt_discard_out(struct sock *sk, struct sk_buff *skb)
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
skb->dev = skb_dst(skb)->dev;
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
@ -2457,7 +2457,7 @@ static int ip6_pkt_prohibit(struct sk_buff *skb)
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
}
static int ip6_pkt_prohibit_out(struct sock *sk, struct sk_buff *skb)
static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
{
skb->dev = skb_dst(skb)->dev;
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);

6
net/ipv6/xfrm6_output.c
View file

@ -147,7 +147,7 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
#ifdef CONFIG_NETFILTER
if (!x) {
IP6CB(skb)->flags |= IP6SKB_REROUTED;
return dst_output(sk, skb);
return dst_output(net, sk, skb);
}
#endif
@ -173,10 +173,8 @@ static int __xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
return x->outer_mode->afinfo->output_finish(sk, skb);
}
int xfrm6_output(struct sock *sk, struct sk_buff *skb)
int xfrm6_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct net *net = dev_net(skb_dst(skb)->dev);
return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING,
net, sk, skb, NULL, skb_dst(skb)->dev,
__xfrm6_output,

2
net/mpls/mpls_iptunnel.c
View file

@ -37,7 +37,7 @@ static unsigned int mpls_encap_size(struct mpls_iptunnel_encap *en)
return en->labels * sizeof(struct mpls_shim_hdr);
}
int mpls_output(struct sock *sk, struct sk_buff *skb)
int mpls_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
struct mpls_iptunnel_encap *tun_encap_info;
struct mpls_shim_hdr *hdr;

8
net/netfilter/ipvs/ip_vs_xmit.c
View file

@ -576,7 +576,7 @@ static inline int ip_vs_nat_send_or_cont(int pf, struct sk_buff *skb,
if (!skb->sk)
skb_sender_cpu_clear(skb);
NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
NULL, skb_dst(skb)->dev, dst_output_okfn);
NULL, skb_dst(skb)->dev, dst_output);
} else
ret = NF_ACCEPT;
@ -598,7 +598,7 @@ static inline int ip_vs_send_or_cont(int pf, struct sk_buff *skb,
if (!skb->sk)
skb_sender_cpu_clear(skb);
NF_HOOK(pf, NF_INET_LOCAL_OUT, cp->ipvs->net, NULL, skb,
NULL, skb_dst(skb)->dev, dst_output_okfn);
NULL, skb_dst(skb)->dev, dst_output);
} else
ret = NF_ACCEPT;
return ret;
@ -1049,7 +1049,7 @@ ip_vs_tunnel_xmit(struct sk_buff *skb, struct ip_vs_conn *cp,
ret = ip_vs_tunnel_xmit_prepare(skb, cp);
if (ret == NF_ACCEPT)
ip_local_out(skb);
ip_local_out(net, skb->sk, skb);
else if (ret == NF_DROP)
kfree_skb(skb);
rcu_read_unlock();
@ -1141,7 +1141,7 @@ ip_vs_tunnel_xmit_v6(struct sk_buff *skb, struct ip_vs_conn *cp,
ret = ip_vs_tunnel_xmit_prepare(skb, cp);
if (ret == NF_ACCEPT)
ip6_local_out(skb);
ip6_local_out(cp->ipvs->net, skb->sk, skb);
else if (ret == NF_DROP)
kfree_skb(skb);
rcu_read_unlock();

4
net/xfrm/xfrm_output.c
View file

@ -136,12 +136,12 @@ int xfrm_output_resume(struct sk_buff *skb, int err)
while (likely((err = xfrm_output_one(skb, err)) == 0)) {
nf_reset(skb);
err = skb_dst(skb)->ops->local_out(skb);
err = skb_dst(skb)->ops->local_out(net, skb->sk, skb);
if (unlikely(err != 1))
goto out;
if (!skb_dst(skb)->xfrm)
return dst_output(skb->sk, skb);
return dst_output(net, skb->sk, skb);
err = nf_hook(skb_dst(skb)->ops->family,
NF_INET_POST_ROUTING, net, skb->sk, skb,

11
net/xfrm/xfrm_policy.c
View file

@ -1887,6 +1887,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
struct sock *sk;
struct dst_entry *dst;
struct xfrm_policy *pol = (struct xfrm_policy *)arg;
struct net *net = xp_net(pol);
struct xfrm_policy_queue *pq = &pol->polq;
struct flowi fl;
struct sk_buff_head list;
@ -1903,8 +1904,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
spin_unlock(&pq->hold_queue.lock);
dst_hold(dst->path);
dst = xfrm_lookup(xp_net(pol), dst->path, &fl,
sk, 0);
dst = xfrm_lookup(net, dst->path, &fl, sk, 0);
if (IS_ERR(dst))
goto purge_queue;
@ -1934,8 +1934,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
xfrm_decode_session(skb, &fl, skb_dst(skb)->ops->family);
dst_hold(skb_dst(skb)->path);
dst = xfrm_lookup(xp_net(pol), skb_dst(skb)->path,
&fl, skb->sk, 0);
dst = xfrm_lookup(net, skb_dst(skb)->path, &fl, skb->sk, 0);
if (IS_ERR(dst)) {
kfree_skb(skb);
continue;
@ -1945,7 +1944,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
skb_dst_drop(skb);
skb_dst_set(skb, dst);
dst_output(skb->sk, skb);
dst_output(net, skb->sk, skb);
}
out:
@ -1958,7 +1957,7 @@ static void xfrm_policy_queue_process(unsigned long arg)
xfrm_pol_put(pol);
}
static int xdst_queue_output(struct sock *sk, struct sk_buff *skb)
static int xdst_queue_output(struct net *net, struct sock *sk, struct sk_buff *skb)
{
unsigned long sched_next;
struct dst_entry *dst = skb_dst(skb);