unimore/kernel-hacking-2024-linux-steffo
unimore/kernel-hacking-2024-linux-steffo
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[NETNS]: Tcp-v4 sockets per-net lookup.

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Add a net argument to inet_lookup and propagate it further
into lookup calls. Plus tune the __inet_check_established.

The dccp and inet_diag, which use that lookup functions
pass the init_net into them.

Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-01-31 05:06:40 -08:00 committed by David S. Miller
parent 941b1d22cc
commit c67499c0e7
5 changed files with 58 additions and 42 deletions
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48
include/net/inet_hashtables.h
View file

@ -302,15 +302,17 @@ static inline void inet_unhash(struct inet_hashinfo *hashinfo, struct sock *sk)
wake_up(&hashinfo->lhash_wait);
}
extern struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
extern struct sock *__inet_lookup_listener(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 daddr,
const unsigned short hnum,
const int dif);
static inline struct sock *inet_lookup_listener(struct inet_hashinfo *hashinfo,
__be32 daddr, __be16 dport, int dif)
static inline struct sock *inet_lookup_listener(struct net *net,
struct inet_hashinfo *hashinfo,
__be32 daddr, __be16 dport, int dif)
{
return __inet_lookup_listener(hashinfo, daddr, ntohs(dport), dif);
return __inet_lookup_listener(net, hashinfo, daddr, ntohs(dport), dif);
}
/* Socket demux engine toys. */
@ -344,26 +346,26 @@ typedef __u64 __bitwise __addrpair;
(((__force __u64)(__be32)(__daddr)) << 32) | \
((__force __u64)(__be32)(__saddr)));
#endif /* __BIG_ENDIAN */
#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && \
#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && ((__sk)->sk_net == (__net)) && \
((*((__addrpair *)&(inet_sk(__sk)->daddr))) == (__cookie)) && \
((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#define INET_TW_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && \
#define INET_TW_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif)\
(((__sk)->sk_hash == (__hash)) && ((__sk)->sk_net == (__net)) && \
((*((__addrpair *)&(inet_twsk(__sk)->tw_daddr))) == (__cookie)) && \
((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#else /* 32-bit arch */
#define INET_ADDR_COOKIE(__name, __saddr, __daddr)
#define INET_MATCH(__sk, __hash, __cookie, __saddr, __daddr, __ports, __dif) \
(((__sk)->sk_hash == (__hash)) && \
#define INET_MATCH(__sk, __net, __hash, __cookie, __saddr, __daddr, __ports, __dif) \
(((__sk)->sk_hash == (__hash)) && ((__sk)->sk_net == (__net)) && \
(inet_sk(__sk)->daddr == (__saddr)) && \
(inet_sk(__sk)->rcv_saddr == (__daddr)) && \
((*((__portpair *)&(inet_sk(__sk)->dport))) == (__ports)) && \
(!((__sk)->sk_bound_dev_if) || ((__sk)->sk_bound_dev_if == (__dif))))
#define INET_TW_MATCH(__sk, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
(((__sk)->sk_hash == (__hash)) && \
#define INET_TW_MATCH(__sk, __net, __hash,__cookie, __saddr, __daddr, __ports, __dif) \
(((__sk)->sk_hash == (__hash)) && ((__sk)->sk_net == (__net)) && \
(inet_twsk(__sk)->tw_daddr == (__saddr)) && \
(inet_twsk(__sk)->tw_rcv_saddr == (__daddr)) && \
((*((__portpair *)&(inet_twsk(__sk)->tw_dport))) == (__ports)) && \
@ -376,32 +378,36 @@ typedef __u64 __bitwise __addrpair;
*
* Local BH must be disabled here.
*/
extern struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
extern struct sock * __inet_lookup_established(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 saddr, const __be16 sport,
const __be32 daddr, const u16 hnum, const int dif);
static inline struct sock *
inet_lookup_established(struct inet_hashinfo *hashinfo,
inet_lookup_established(struct net *net, struct inet_hashinfo *hashinfo,
const __be32 saddr, const __be16 sport,
const __be32 daddr, const __be16 dport,
const int dif)
{
return __inet_lookup_established(hashinfo, saddr, sport, daddr,
return __inet_lookup_established(net, hashinfo, saddr, sport, daddr,
ntohs(dport), dif);
}
static inline struct sock *__inet_lookup(struct inet_hashinfo *hashinfo,
static inline struct sock *__inet_lookup(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 saddr, const __be16 sport,
const __be32 daddr, const __be16 dport,
const int dif)
{
u16 hnum = ntohs(dport);
struct sock *sk = __inet_lookup_established(hashinfo, saddr, sport, daddr,
hnum, dif);
return sk ? : __inet_lookup_listener(hashinfo, daddr, hnum, dif);
struct sock *sk = __inet_lookup_established(net, hashinfo,
saddr, sport, daddr, hnum, dif);
return sk ? : __inet_lookup_listener(net, hashinfo, daddr, hnum, dif);
}
static inline struct sock *inet_lookup(struct inet_hashinfo *hashinfo,
static inline struct sock *inet_lookup(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 saddr, const __be16 sport,
const __be32 daddr, const __be16 dport,
const int dif)
@ -409,7 +415,7 @@ static inline struct sock *inet_lookup(struct inet_hashinfo *hashinfo,
struct sock *sk;
local_bh_disable();
sk = __inet_lookup(hashinfo, saddr, sport, daddr, dport, dif);
sk = __inet_lookup(net, hashinfo, saddr, sport, daddr, dport, dif);
local_bh_enable();
return sk;

6
net/dccp/ipv4.c
View file

@ -218,7 +218,7 @@ static void dccp_v4_err(struct sk_buff *skb, u32 info)
return;
}
sk = inet_lookup(&dccp_hashinfo, iph->daddr, dh->dccph_dport,
sk = inet_lookup(&init_net, &dccp_hashinfo, iph->daddr, dh->dccph_dport,
iph->saddr, dh->dccph_sport, inet_iif(skb));
if (sk == NULL) {
ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
@ -436,7 +436,7 @@ static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
if (req != NULL)
return dccp_check_req(sk, skb, req, prev);
nsk = inet_lookup_established(&dccp_hashinfo,
nsk = inet_lookup_established(&init_net, &dccp_hashinfo,
iph->saddr, dh->dccph_sport,
iph->daddr, dh->dccph_dport,
inet_iif(skb));
@ -817,7 +817,7 @@ static int dccp_v4_rcv(struct sk_buff *skb)
/* Step 2:
* Look up flow ID in table and get corresponding socket */
sk = __inet_lookup(&dccp_hashinfo,
sk = __inet_lookup(&init_net, &dccp_hashinfo,
iph->saddr, dh->dccph_sport,
iph->daddr, dh->dccph_dport, inet_iif(skb));
/*

2
net/ipv4/inet_diag.c
View file

@ -268,7 +268,7 @@ static int inet_diag_get_exact(struct sk_buff *in_skb,
err = -EINVAL;
if (req->idiag_family == AF_INET) {
sk = inet_lookup(hashinfo, req->id.idiag_dst[0],
sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
req->id.idiag_dport, req->id.idiag_src[0],
req->id.idiag_sport, req->id.idiag_if);
}

29
net/ipv4/inet_hashtables.c
View file

@ -127,7 +127,8 @@ EXPORT_SYMBOL(inet_listen_wlock);
* remote address for the connection. So always assume those are both
* wildcarded during the search since they can never be otherwise.
*/
static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
static struct sock *inet_lookup_listener_slow(struct net *net,
const struct hlist_head *head,
const __be32 daddr,
const unsigned short hnum,
const int dif)
@ -139,7 +140,8 @@ static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
sk_for_each(sk, node, head) {
const struct inet_sock *inet = inet_sk(sk);
if (inet->num == hnum && !ipv6_only_sock(sk)) {
if (sk->sk_net == net && inet->num == hnum &&
!ipv6_only_sock(sk)) {
const __be32 rcv_saddr = inet->rcv_saddr;
int score = sk->sk_family == PF_INET ? 1 : 0;
@ -165,7 +167,8 @@ static struct sock *inet_lookup_listener_slow(const struct hlist_head *head,
}
/* Optimize the common listener case. */
struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
struct sock *__inet_lookup_listener(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 daddr, const unsigned short hnum,
const int dif)
{
@ -180,9 +183,9 @@ struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
if (inet->num == hnum && !sk->sk_node.next &&
(!inet->rcv_saddr || inet->rcv_saddr == daddr) &&
(sk->sk_family == PF_INET || !ipv6_only_sock(sk)) &&
!sk->sk_bound_dev_if)
!sk->sk_bound_dev_if && sk->sk_net == net)
goto sherry_cache;
sk = inet_lookup_listener_slow(head, daddr, hnum, dif);
sk = inet_lookup_listener_slow(net, head, daddr, hnum, dif);
}
if (sk) {
sherry_cache:
@ -193,7 +196,8 @@ struct sock *__inet_lookup_listener(struct inet_hashinfo *hashinfo,
}
EXPORT_SYMBOL_GPL(__inet_lookup_listener);
struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
struct sock * __inet_lookup_established(struct net *net,
struct inet_hashinfo *hashinfo,
const __be32 saddr, const __be16 sport,
const __be32 daddr, const u16 hnum,
const int dif)
@ -212,13 +216,15 @@ struct sock * __inet_lookup_established(struct inet_hashinfo *hashinfo,
prefetch(head->chain.first);
read_lock(lock);
sk_for_each(sk, node, &head->chain) {
if (INET_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
if (INET_MATCH(sk, net, hash, acookie,
saddr, daddr, ports, dif))
goto hit; /* You sunk my battleship! */
}
/* Must check for a TIME_WAIT'er before going to listener hash. */
sk_for_each(sk, node, &head->twchain) {
if (INET_TW_MATCH(sk, hash, acookie, saddr, daddr, ports, dif))
if (INET_TW_MATCH(sk, net, hash, acookie,
saddr, daddr, ports, dif))
goto hit;
}
sk = NULL;
@ -249,6 +255,7 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
struct sock *sk2;
const struct hlist_node *node;
struct inet_timewait_sock *tw;
struct net *net = sk->sk_net;
prefetch(head->chain.first);
write_lock(lock);
@ -257,7 +264,8 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
sk_for_each(sk2, node, &head->twchain) {
tw = inet_twsk(sk2);
if (INET_TW_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif)) {
if (INET_TW_MATCH(sk2, net, hash, acookie,
saddr, daddr, ports, dif)) {
if (twsk_unique(sk, sk2, twp))
goto unique;
else
@ -268,7 +276,8 @@ static int __inet_check_established(struct inet_timewait_death_row *death_row,
/* And established part... */
sk_for_each(sk2, node, &head->chain) {
if (INET_MATCH(sk2, hash, acookie, saddr, daddr, ports, dif))
if (INET_MATCH(sk2, net, hash, acookie,
saddr, daddr, ports, dif))
goto not_unique;
}

15
net/ipv4/tcp_ipv4.c
View file

@ -369,8 +369,8 @@ void tcp_v4_err(struct sk_buff *skb, u32 info)
return;
}
sk = inet_lookup(&tcp_hashinfo, iph->daddr, th->dest, iph->saddr,
th->source, inet_iif(skb));
sk = inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->daddr, th->dest,
iph->saddr, th->source, inet_iif(skb));
if (!sk) {
ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
return;
@ -1503,8 +1503,8 @@ static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
if (req)
return tcp_check_req(sk, skb, req, prev);
nsk = inet_lookup_established(&tcp_hashinfo, iph->saddr, th->source,
iph->daddr, th->dest, inet_iif(skb));
nsk = inet_lookup_established(sk->sk_net, &tcp_hashinfo, iph->saddr,
th->source, iph->daddr, th->dest, inet_iif(skb));
if (nsk) {
if (nsk->sk_state != TCP_TIME_WAIT) {
@ -1661,8 +1661,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
TCP_SKB_CB(skb)->flags = iph->tos;
TCP_SKB_CB(skb)->sacked = 0;
sk = __inet_lookup(&tcp_hashinfo, iph->saddr, th->source,
iph->daddr, th->dest, inet_iif(skb));
sk = __inet_lookup(skb->dev->nd_net, &tcp_hashinfo, iph->saddr,
th->source, iph->daddr, th->dest, inet_iif(skb));
if (!sk)
goto no_tcp_socket;
@ -1735,7 +1735,8 @@ int tcp_v4_rcv(struct sk_buff *skb)
}
switch (tcp_timewait_state_process(inet_twsk(sk), skb, th)) {
case TCP_TW_SYN: {
struct sock *sk2 = inet_lookup_listener(&tcp_hashinfo,
struct sock *sk2 = inet_lookup_listener(skb->dev->nd_net,
&tcp_hashinfo,
iph->daddr, th->dest,
inet_iif(skb));
if (sk2) {