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tcp/dccp: install syn_recv requests into ehash table 

In this patch, we insert request sockets into TCP/DCCP
regular ehash table (where ESTABLISHED and TIMEWAIT sockets
are) instead of using the per listener hash table.

ACK packets find SYN_RECV pseudo sockets without having
to find and lock the listener.

In nominal conditions, this halves pressure on listener lock.

Note that this will allow for SO_REUSEPORT refinements,
so that we can select a listener using cpu/numa affinities instead
of the prior 'consistent hash', since only SYN packets will
apply this selection logic.

We will shrink listen_sock in the following patch to ease
code review.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Ying Cai <ycai@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-10-02 11:43:32 -07:00 committed by David S. Miller
parent 2feda34192
commit 079096f103
15 changed files with 163 additions and 504 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/inet_connection_sock.h
View File

@ -258,10 +258,6 @@ inet_csk_rto_backoff(const struct inet_connection_sock *icsk,
struct sock *inet_csk_accept(struct sock *sk, int flags, int *err);
struct request_sock *inet_csk_search_req(struct sock *sk,
const __be16 rport,
const __be32 raddr,
const __be32 laddr);
int inet_csk_bind_conflict(const struct sock *sk,
const struct inet_bind_bucket *tb, bool relax);
int inet_csk_get_port(struct sock *sk, unsigned short snum);

1
include/net/inet_hashtables.h
View File

@ -205,6 +205,7 @@ void inet_put_port(struct sock *sk);
void inet_hashinfo_init(struct inet_hashinfo *h);
int inet_ehash_insert(struct sock *sk, struct sock *osk);
void __inet_hash_nolisten(struct sock *sk, struct sock *osk);
void __inet_hash(struct sock *sk, struct sock *osk);
void inet_hash(struct sock *sk);

4
include/net/request_sock.h
View File

@ -266,8 +266,4 @@ static inline int reqsk_queue_is_full(const struct request_sock_queue *queue)
return reqsk_queue_len(queue) >> queue->listen_opt->max_qlen_log;
}
void reqsk_queue_hash_req(struct request_sock_queue *queue,
u32 hash, struct request_sock *req,
unsigned long timeout);
#endif /* _REQUEST_SOCK_H */

3
include/net/tcp.h
View File

@ -1618,7 +1618,6 @@ static inline bool tcp_stream_is_thin(struct tcp_sock *tp)
/* /proc */
enum tcp_seq_states {
TCP_SEQ_STATE_LISTENING,
TCP_SEQ_STATE_OPENREQ,
TCP_SEQ_STATE_ESTABLISHED,
};
@ -1717,8 +1716,6 @@ struct tcp_request_sock_ops {
int (*send_synack)(const struct sock *sk, struct dst_entry *dst,
struct flowi *fl, struct request_sock *req,
u16 queue_mapping, struct tcp_fastopen_cookie *foc);
void (*queue_hash_add)(struct sock *sk, struct request_sock *req,
const unsigned long timeout);
};
#ifdef CONFIG_SYN_COOKIES

28
net/core/request_sock.c
View File

@ -99,35 +99,9 @@ static inline struct listen_sock *reqsk_queue_yank_listen_sk(
void reqsk_queue_destroy(struct request_sock_queue *queue)
{
/* make all the listen_opt local to us */
struct listen_sock *lopt = reqsk_queue_yank_listen_sk(queue);
if (reqsk_queue_len(queue) != 0) {
unsigned int i;
for (i = 0; i < lopt->nr_table_entries; i++) {
struct request_sock *req;
spin_lock_bh(&queue->syn_wait_lock);
while ((req = lopt->syn_table[i]) != NULL) {
lopt->syn_table[i] = req->dl_next;
/* Because of following del_timer_sync(),
* we must release the spinlock here
* or risk a dead lock.
*/
spin_unlock_bh(&queue->syn_wait_lock);
atomic_dec(&queue->qlen);
if (del_timer_sync(&req->rsk_timer))
reqsk_put(req);
reqsk_put(req);
spin_lock_bh(&queue->syn_wait_lock);
}
spin_unlock_bh(&queue->syn_wait_lock);
}
}
if (WARN_ON(reqsk_queue_len(queue) != 0))
pr_err("qlen %u\n", reqsk_queue_len(queue));
/* cleaning is done by req timers */
kvfree(lopt);
}

64
net/dccp/ipv4.c
View File

@ -444,36 +444,6 @@ put_and_exit:
}
EXPORT_SYMBOL_GPL(dccp_v4_request_recv_sock);
static struct sock *dccp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
{
const struct dccp_hdr *dh = dccp_hdr(skb);
const struct iphdr *iph = ip_hdr(skb);
struct sock *nsk;
/* Find possible connection requests. */
struct request_sock *req = inet_csk_search_req(sk, dh->dccph_sport,
iph->saddr, iph->daddr);
if (req) {
nsk = dccp_check_req(sk, skb, req);
if (!nsk)
reqsk_put(req);
return nsk;
}
nsk = inet_lookup_established(sock_net(sk), &dccp_hashinfo,
iph->saddr, dh->dccph_sport,
iph->daddr, dh->dccph_dport,
inet_iif(skb));
if (nsk != NULL) {
if (nsk->sk_state != DCCP_TIME_WAIT) {
bh_lock_sock(nsk);
return nsk;
}
inet_twsk_put(inet_twsk(nsk));
return NULL;
}
return sk;
}
static struct dst_entry* dccp_v4_route_skb(struct net *net, struct sock *sk,
struct sk_buff *skb)
{
@ -705,18 +675,6 @@ int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
* NOTE: the check for the packet types is done in
* dccp_rcv_state_process
*/
if (sk->sk_state == DCCP_LISTEN) {
struct sock *nsk = dccp_v4_hnd_req(sk, skb);
if (nsk == NULL)
goto discard;
if (nsk != sk) {
if (dccp_child_process(sk, nsk, skb))
goto reset;
return 0;
}
}
if (dccp_rcv_state_process(sk, skb, dh, skb->len))
goto reset;
@ -724,7 +682,6 @@ int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
reset:
dccp_v4_ctl_send_reset(sk, skb);
discard:
kfree_skb(skb);
return 0;
}
@ -868,6 +825,27 @@ static int dccp_v4_rcv(struct sk_buff *skb)
goto no_dccp_socket;
}
if (sk->sk_state == DCCP_NEW_SYN_RECV) {
struct request_sock *req = inet_reqsk(sk);
struct sock *nsk = NULL;
sk = req->rsk_listener;
if (sk->sk_state == DCCP_LISTEN)
nsk = dccp_check_req(sk, skb, req);
if (!nsk) {
reqsk_put(req);
goto discard_it;
}
if (nsk == sk) {
sock_hold(sk);
reqsk_put(req);
} else if (dccp_child_process(sk, nsk, skb)) {
dccp_v4_ctl_send_reset(sk, skb);
goto discard_it;
} else {
return 0;
}
}
/*
* RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
* o if MinCsCov = 0, only packets with CsCov = 0 are accepted

72
net/dccp/ipv6.c
View File

@ -290,37 +290,6 @@ static struct request_sock_ops dccp6_request_sock_ops = {
.syn_ack_timeout = dccp_syn_ack_timeout,
};
static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
{
const struct dccp_hdr *dh = dccp_hdr(skb);
const struct ipv6hdr *iph = ipv6_hdr(skb);
struct request_sock *req;
struct sock *nsk;
req = inet6_csk_search_req(sk, dh->dccph_sport, &iph->saddr,
&iph->daddr, inet6_iif(skb));
if (req) {
nsk = dccp_check_req(sk, skb, req);
if (!nsk)
reqsk_put(req);
return nsk;
}
nsk = __inet6_lookup_established(sock_net(sk), &dccp_hashinfo,
&iph->saddr, dh->dccph_sport,
&iph->daddr, ntohs(dh->dccph_dport),
inet6_iif(skb));
if (nsk != NULL) {
if (nsk->sk_state != DCCP_TIME_WAIT) {
bh_lock_sock(nsk);
return nsk;
}
inet_twsk_put(inet_twsk(nsk));
return NULL;
}
return sk;
}
static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
{
struct request_sock *req;
@ -398,7 +367,7 @@ static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
if (dccp_v6_send_response(sk, req))
goto drop_and_free;
inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
return 0;
drop_and_free:
@ -641,24 +610,6 @@ static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
* NOTE: the check for the packet types is done in
* dccp_rcv_state_process
*/
if (sk->sk_state == DCCP_LISTEN) {
struct sock *nsk = dccp_v6_hnd_req(sk, skb);
if (nsk == NULL)
goto discard;
/*
* Queue it on the new socket if the new socket is active,
* otherwise we just shortcircuit this and continue with
* the new socket..
*/
if (nsk != sk) {
if (dccp_child_process(sk, nsk, skb))
goto reset;
if (opt_skb != NULL)
__kfree_skb(opt_skb);
return 0;
}
}
if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
goto reset;
@ -732,6 +683,27 @@ static int dccp_v6_rcv(struct sk_buff *skb)
goto no_dccp_socket;
}
if (sk->sk_state == DCCP_NEW_SYN_RECV) {
struct request_sock *req = inet_reqsk(sk);
struct sock *nsk = NULL;
sk = req->rsk_listener;
if (sk->sk_state == DCCP_LISTEN)
nsk = dccp_check_req(sk, skb, req);
if (!nsk) {
reqsk_put(req);
goto discard_it;
}
if (nsk == sk) {
sock_hold(sk);
reqsk_put(req);
} else if (dccp_child_process(sk, nsk, skb)) {
dccp_v6_ctl_send_reset(sk, skb);
goto discard_it;
} else {
return 0;
}
}
/*
* RFC 4340, sec. 9.2.1: Minimum Checksum Coverage
* o if MinCsCov = 0, only packets with CsCov = 0 are accepted

103
net/ipv4/inet_connection_sock.c
View File

@ -476,65 +476,12 @@ no_route:
}
EXPORT_SYMBOL_GPL(inet_csk_route_child_sock);
static inline u32 inet_synq_hash(const __be32 raddr, const __be16 rport,
const u32 rnd, const u32 synq_hsize)
{
return jhash_2words((__force u32)raddr, (__force u32)rport, rnd) & (synq_hsize - 1);
}
#if IS_ENABLED(CONFIG_IPV6)
#define AF_INET_FAMILY(fam) ((fam) == AF_INET)
#else
#define AF_INET_FAMILY(fam) true
#endif
/* Note: this is temporary :
* req sock will no longer be in listener hash table
*/
struct request_sock *inet_csk_search_req(struct sock *sk,
const __be16 rport,
const __be32 raddr,
const __be32 laddr)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
struct request_sock *req;
u32 hash = inet_synq_hash(raddr, rport, lopt->hash_rnd,
lopt->nr_table_entries);
spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) {
const struct inet_request_sock *ireq = inet_rsk(req);
if (ireq->ir_rmt_port == rport &&
ireq->ir_rmt_addr == raddr &&
ireq->ir_loc_addr == laddr &&
AF_INET_FAMILY(req->rsk_ops->family)) {
atomic_inc(&req->rsk_refcnt);
WARN_ON(req->sk);
break;
}
}
spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
return req;
}
EXPORT_SYMBOL_GPL(inet_csk_search_req);
void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
unsigned long timeout)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
const u32 h = inet_synq_hash(inet_rsk(req)->ir_rmt_addr,
inet_rsk(req)->ir_rmt_port,
lopt->hash_rnd, lopt->nr_table_entries);
reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
inet_csk_reqsk_queue_added(sk);
}
EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
/* Only thing we need from tcp.h */
extern int sysctl_tcp_synack_retries;
@ -571,26 +518,20 @@ int inet_rtx_syn_ack(const struct sock *parent, struct request_sock *req)
}
EXPORT_SYMBOL(inet_rtx_syn_ack);
/* return true if req was found in the syn_table[] */
/* return true if req was found in the ehash table */
static bool reqsk_queue_unlink(struct request_sock_queue *queue,
struct request_sock *req)
{
struct listen_sock *lopt = queue->listen_opt;
struct request_sock **prev;
bool found = false;
struct inet_hashinfo *hashinfo = req_to_sk(req)->sk_prot->h.hashinfo;
spinlock_t *lock;
bool found;
spin_lock(&queue->syn_wait_lock);
lock = inet_ehash_lockp(hashinfo, req->rsk_hash);
for (prev = &lopt->syn_table[req->rsk_hash]; *prev != NULL;
prev = &(*prev)->dl_next) {
if (*prev == req) {
*prev = req->dl_next;
found = true;
break;
}
}
spin_lock(lock);
found = __sk_nulls_del_node_init_rcu(req_to_sk(req));
spin_unlock(lock);
spin_unlock(&queue->syn_wait_lock);
if (timer_pending(&req->rsk_timer) && del_timer_sync(&req->rsk_timer))
reqsk_put(req);
return found;
@ -616,10 +557,8 @@ static void reqsk_timer_handler(unsigned long data)
int max_retries, thresh;
u8 defer_accept;
if (sk_listener->sk_state != TCP_LISTEN || !lopt) {
reqsk_put(req);
return;
}
if (sk_listener->sk_state != TCP_LISTEN || !lopt)
goto drop;
max_retries = icsk->icsk_syn_retries ? : sysctl_tcp_synack_retries;
thresh = max_retries;
@ -669,36 +608,36 @@ static void reqsk_timer_handler(unsigned long data)
mod_timer_pinned(&req->rsk_timer, jiffies + timeo);
return;
}
drop:
inet_csk_reqsk_queue_drop(sk_listener, req);
reqsk_put(req);
}
void reqsk_queue_hash_req(struct request_sock_queue *queue,
u32 hash, struct request_sock *req,
static void reqsk_queue_hash_req(struct request_sock *req,
unsigned long timeout)
{
struct listen_sock *lopt = queue->listen_opt;
req->num_retrans = 0;
req->num_timeout = 0;
req->sk = NULL;
setup_timer(&req->rsk_timer, reqsk_timer_handler, (unsigned long)req);
mod_timer_pinned(&req->rsk_timer, jiffies + timeout);
req->rsk_hash = hash;
inet_ehash_insert(req_to_sk(req), NULL);
/* before letting lookups find us, make sure all req fields
* are committed to memory and refcnt initialized.
*/
smp_wmb();
atomic_set(&req->rsk_refcnt, 2);
spin_lock(&queue->syn_wait_lock);
req->dl_next = lopt->syn_table[hash];
lopt->syn_table[hash] = req;
spin_unlock(&queue->syn_wait_lock);
}
EXPORT_SYMBOL(reqsk_queue_hash_req);
void inet_csk_reqsk_queue_hash_add(struct sock *sk, struct request_sock *req,
unsigned long timeout)
{
reqsk_queue_hash_req(req, timeout);
inet_csk_reqsk_queue_added(sk);
}
EXPORT_SYMBOL_GPL(inet_csk_reqsk_queue_hash_add);
/**
* inet_csk_clone_lock - clone an inet socket, and lock its clone

96
net/ipv4/inet_diag.c
View File

@ -730,91 +730,21 @@ static void twsk_build_assert(void)
#endif
}
static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r,
const struct nlattr *bc)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct inet_sock *inet = inet_sk(sk);
struct inet_diag_entry entry;
int j, s_j, reqnum, s_reqnum;
struct listen_sock *lopt;
int err = 0;
s_j = cb->args[3];
s_reqnum = cb->args[4];
if (s_j > 0)
s_j--;
entry.family = sk->sk_family;
spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
lopt = icsk->icsk_accept_queue.listen_opt;
if (!lopt || !reqsk_queue_len(&icsk->icsk_accept_queue))
goto out;
if (bc) {
entry.sport = inet->inet_num;
entry.userlocks = sk->sk_userlocks;
}
for (j = s_j; j < lopt->nr_table_entries; j++) {
struct request_sock *req, *head = lopt->syn_table[j];
reqnum = 0;
for (req = head; req; reqnum++, req = req->dl_next) {
struct inet_request_sock *ireq = inet_rsk(req);
if (reqnum < s_reqnum)
continue;
if (r->id.idiag_dport != ireq->ir_rmt_port &&
r->id.idiag_dport)
continue;
if (bc) {
/* Note: entry.sport and entry.userlocks are already set */
entry_fill_addrs(&entry, req_to_sk(req));
entry.dport = ntohs(ireq->ir_rmt_port);
if (!inet_diag_bc_run(bc, &entry))
continue;
}
err = inet_req_diag_fill(req_to_sk(req), skb,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
NLM_F_MULTI, cb->nlh);
if (err < 0) {
cb->args[3] = j + 1;
cb->args[4] = reqnum;
goto out;
}
}
s_reqnum = 0;
}
out:
spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
return err;
}
void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
struct netlink_callback *cb,
const struct inet_diag_req_v2 *r, struct nlattr *bc)
{
struct net *net = sock_net(skb->sk);
int i, num, s_i, s_num;
u32 idiag_states = r->idiag_states;
if (idiag_states & TCPF_SYN_RECV)
idiag_states |= TCPF_NEW_SYN_RECV;
s_i = cb->args[1];
s_num = num = cb->args[2];
if (cb->args[0] == 0) {
if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
if (!(idiag_states & TCPF_LISTEN))
goto skip_listen_ht;
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
@ -844,21 +774,11 @@ void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
r->id.idiag_sport)
goto next_listen;
if (!(r->idiag_states & TCPF_LISTEN) ||
r->id.idiag_dport ||
if (r->id.idiag_dport ||
cb->args[3] > 0)
goto syn_recv;
if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
spin_unlock_bh(&ilb->lock);
goto done;
}
syn_recv:
if (!(r->idiag_states & TCPF_SYN_RECV))
goto next_listen;
if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
spin_unlock_bh(&ilb->lock);
goto done;
}
@ -879,7 +799,7 @@ skip_listen_ht:
s_i = num = s_num = 0;
}
if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
if (!(idiag_states & ~TCPF_LISTEN))
goto out;
for (i = s_i; i <= hashinfo->ehash_mask; i++) {
@ -906,7 +826,7 @@ skip_listen_ht:
goto next_normal;
state = (sk->sk_state == TCP_TIME_WAIT) ?
inet_twsk(sk)->tw_substate : sk->sk_state;
if (!(r->idiag_states & (1 << state)))
if (!(idiag_states & (1 << state)))
goto next_normal;
if (r->sdiag_family != AF_UNSPEC &&
sk->sk_family != r->sdiag_family)

14
net/ipv4/inet_hashtables.c
View File

@ -398,14 +398,18 @@ static u32 inet_sk_port_offset(const struct sock *sk)
inet->inet_dport);
}
void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
/* insert a socket into ehash, and eventually remove another one
* (The another one can be a SYN_RECV or TIMEWAIT
*/
int inet_ehash_insert(struct sock *sk, struct sock *osk)
{
struct inet_hashinfo *hashinfo = sk->sk_prot->h.hashinfo;
struct hlist_nulls_head *list;
struct inet_ehash_bucket *head;
spinlock_t *lock;
int ret = 0;
WARN_ON(!sk_unhashed(sk));
WARN_ON_ONCE(!sk_unhashed(sk));
sk->sk_hash = sk_ehashfn(sk);
head = inet_ehash_bucket(hashinfo, sk->sk_hash);
@ -419,6 +423,12 @@ void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
sk_nulls_del_node_init_rcu(osk);
}
spin_unlock(lock);
return ret;
}
void __inet_hash_nolisten(struct sock *sk, struct sock *osk)
{
inet_ehash_insert(sk, osk);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
}
EXPORT_SYMBOL_GPL(__inet_hash_nolisten);

4
net/ipv4/syncookies.c
View File

@ -284,6 +284,10 @@ bool cookie_ecn_ok(const struct tcp_options_received *tcp_opt,
}
EXPORT_SYMBOL(cookie_ecn_ok);
/* On input, sk is a listener.
* Output is listener if incoming packet would not create a child
* NULL if memory could not be allocated.
*/
struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb)
{
struct ip_options *opt = &TCP_SKB_CB(skb)->header.h4.opt;

2
net/ipv4/tcp_input.c
View File

@ -6241,7 +6241,7 @@ int tcp_conn_request(struct request_sock_ops *rsk_ops,
goto drop_and_free;
tcp_rsk(req)->tfo_listener = false;
af_ops->queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
}
tcp_reqsk_record_syn(sk, req, skb);

111
net/ipv4/tcp_ipv4.c
View File

@ -1224,7 +1224,6 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv4_ops = {
.route_req = tcp_v4_route_req,
.init_seq = tcp_v4_init_sequence,
.send_synack = tcp_v4_send_synack,
.queue_hash_add = inet_csk_reqsk_queue_hash_add,
};
int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
@ -1343,34 +1342,11 @@ put_and_exit:
}
EXPORT_SYMBOL(tcp_v4_syn_recv_sock);
static struct sock *tcp_v4_hnd_req(struct sock *sk, struct sk_buff *skb)
static struct sock *tcp_v4_cookie_check(struct sock *sk, struct sk_buff *skb)
{
const struct tcphdr *th = tcp_hdr(skb);
const struct iphdr *iph = ip_hdr(skb);
struct request_sock *req;
struct sock *nsk;
req = inet_csk_search_req(sk, th->source, iph->saddr, iph->daddr);
if (req) {
nsk = tcp_check_req(sk, skb, req, false);
if (!nsk || nsk == sk)
reqsk_put(req);
return nsk;
}
nsk = inet_lookup_established(sock_net(sk), &tcp_hashinfo, iph->saddr,
th->source, iph->daddr, th->dest, inet_iif(skb));
if (nsk) {
if (nsk->sk_state != TCP_TIME_WAIT) {
bh_lock_sock(nsk);
return nsk;
}
inet_twsk_put(inet_twsk(nsk));
return NULL;
}
#ifdef CONFIG_SYN_COOKIES
const struct tcphdr *th = tcp_hdr(skb);
if (!th->syn)
sk = cookie_v4_check(sk, skb);
#endif
@ -1409,10 +1385,10 @@ int tcp_v4_do_rcv(struct sock *sk, struct sk_buff *skb)
goto csum_err;
if (sk->sk_state == TCP_LISTEN) {
struct sock *nsk = tcp_v4_hnd_req(sk, skb);
struct sock *nsk = tcp_v4_cookie_check(sk, skb);
if (!nsk)
goto discard;
if (nsk != sk) {
sock_rps_save_rxhash(nsk, skb);
sk_mark_napi_id(nsk, skb);
@ -1603,6 +1579,29 @@ process:
if (sk->sk_state == TCP_TIME_WAIT)
goto do_time_wait;
if (sk->sk_state == TCP_NEW_SYN_RECV) {
struct request_sock *req = inet_reqsk(sk);
struct sock *nsk = NULL;
sk = req->rsk_listener;
if (tcp_v4_inbound_md5_hash(sk, skb))
goto discard_and_relse;
if (sk->sk_state == TCP_LISTEN)
nsk = tcp_check_req(sk, skb, req, false);
if (!nsk) {
reqsk_put(req);
goto discard_it;
}
if (nsk == sk) {
sock_hold(sk);
reqsk_put(req);
} else if (tcp_child_process(sk, nsk, skb)) {
tcp_v4_send_reset(nsk, skb);
goto discard_it;
} else {
return 0;
}
}
if (unlikely(iph->ttl < inet_sk(sk)->min_ttl)) {
NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
goto discard_and_relse;
@ -1830,35 +1829,7 @@ static void *listening_get_next(struct seq_file *seq, void *cur)
++st->num;
++st->offset;
if (st->state == TCP_SEQ_STATE_OPENREQ) {
struct request_sock *req = cur;
icsk = inet_csk(st->syn_wait_sk);
req = req->dl_next;
while (1) {
while (req) {
if (req->rsk_ops->family == st->family) {
cur = req;
goto out;
}
req = req->dl_next;
}
if (++st->sbucket >= icsk->icsk_accept_queue.listen_opt->nr_table_entries)
break;
get_req:
req = icsk->icsk_accept_queue.listen_opt->syn_table[st->sbucket];
}
sk = sk_nulls_next(st->syn_wait_sk);
st->state = TCP_SEQ_STATE_LISTENING;
spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
} else {
icsk = inet_csk(sk);
spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
if (reqsk_queue_len(&icsk->icsk_accept_queue))
goto start_req;
spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
sk = sk_nulls_next(sk);
}
get_sk:
sk_nulls_for_each_from(sk, node) {
if (!net_eq(sock_net(sk), net))
@ -1868,15 +1839,6 @@ get_sk:
goto out;
}
icsk = inet_csk(sk);
spin_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
if (reqsk_queue_len(&icsk->icsk_accept_queue)) {
start_req:
st->syn_wait_sk = sk;
st->state = TCP_SEQ_STATE_OPENREQ;
st->sbucket = 0;
goto get_req;
}
spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
}
spin_unlock_bh(&ilb->lock);
st->offset = 0;
@ -2008,7 +1970,6 @@ static void *tcp_seek_last_pos(struct seq_file *seq)
void *rc = NULL;
switch (st->state) {
case TCP_SEQ_STATE_OPENREQ:
case TCP_SEQ_STATE_LISTENING:
if (st->bucket >= INET_LHTABLE_SIZE)
break;
@ -2067,7 +2028,6 @@ static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
}
switch (st->state) {
case TCP_SEQ_STATE_OPENREQ:
case TCP_SEQ_STATE_LISTENING:
rc = listening_get_next(seq, v);
if (!rc) {
@ -2092,11 +2052,6 @@ static void tcp_seq_stop(struct seq_file *seq, void *v)
struct tcp_iter_state *st = seq->private;
switch (st->state) {
case TCP_SEQ_STATE_OPENREQ:
if (v) {
struct inet_connection_sock *icsk = inet_csk(st->syn_wait_sk);
spin_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
}
case TCP_SEQ_STATE_LISTENING:
if (v != SEQ_START_TOKEN)
spin_unlock_bh(&tcp_hashinfo.listening_hash[st->bucket].lock);
@ -2269,18 +2224,12 @@ static int tcp4_seq_show(struct seq_file *seq, void *v)
}
st = seq->private;
switch (st->state) {
case TCP_SEQ_STATE_LISTENING:
case TCP_SEQ_STATE_ESTABLISHED:
if (sk->sk_state == TCP_TIME_WAIT)
get_timewait4_sock(v, seq, st->num);
else if (sk->sk_state == TCP_NEW_SYN_RECV)
get_openreq4(v, seq, st->num);
else
get_tcp4_sock(v, seq, st->num);
break;
case TCP_SEQ_STATE_OPENREQ:
get_openreq4(v, seq, st->num);
break;
}
out:
seq_pad(seq, '\n');
return 0;

67
net/ipv6/inet6_connection_sock.c
View File

@ -94,73 +94,6 @@ struct dst_entry *inet6_csk_route_req(const struct sock *sk,
}
EXPORT_SYMBOL(inet6_csk_route_req);
/*
* request_sock (formerly open request) hash tables.
*/
static u32 inet6_synq_hash(const struct in6_addr *raddr, const __be16 rport,
const u32 rnd, const u32 synq_hsize)
{
u32 c;
c = jhash_3words((__force u32)raddr->s6_addr32[0],
(__force u32)raddr->s6_addr32[1],
(__force u32)raddr->s6_addr32[2],
rnd);
c = jhash_2words((__force u32)raddr->s6_addr32[3],
(__force u32)rport,
c);
return c & (synq_hsize - 1);
}
struct request_sock *inet6_csk_search_req(struct sock *sk,
const __be16 rport,
const struct in6_addr *raddr,
const struct in6_addr *laddr,
const int iif)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
struct request_sock *req;
u32 hash = inet6_synq_hash(raddr, rport, lopt->hash_rnd,
lopt->nr_table_entries);
spin_lock(&icsk->icsk_accept_queue.syn_wait_lock);
for (req = lopt->syn_table[hash]; req != NULL; req = req->dl_next) {
const struct inet_request_sock *ireq = inet_rsk(req);
if (ireq->ir_rmt_port == rport &&
req->rsk_ops->family == AF_INET6 &&
ipv6_addr_equal(&ireq->ir_v6_rmt_addr, raddr) &&
ipv6_addr_equal(&ireq->ir_v6_loc_addr, laddr) &&
(!ireq->ir_iif || ireq->ir_iif == iif)) {
atomic_inc(&req->rsk_refcnt);
WARN_ON(req->sk != NULL);
break;
}
}
spin_unlock(&icsk->icsk_accept_queue.syn_wait_lock);
return req;
}
EXPORT_SYMBOL_GPL(inet6_csk_search_req);
void inet6_csk_reqsk_queue_hash_add(struct sock *sk,
struct request_sock *req,
const unsigned long timeout)
{
struct inet_connection_sock *icsk = inet_csk(sk);
struct listen_sock *lopt = icsk->icsk_accept_queue.listen_opt;
const u32 h = inet6_synq_hash(&inet_rsk(req)->ir_v6_rmt_addr,
inet_rsk(req)->ir_rmt_port,
lopt->hash_rnd, lopt->nr_table_entries);
reqsk_queue_hash_req(&icsk->icsk_accept_queue, h, req, timeout);
inet_csk_reqsk_queue_added(sk);
}
EXPORT_SYMBOL_GPL(inet6_csk_reqsk_queue_hash_add);
void inet6_csk_addr2sockaddr(struct sock *sk, struct sockaddr *uaddr)
{
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) uaddr;

78
net/ipv6/tcp_ipv6.c
View File

@ -727,7 +727,6 @@ static const struct tcp_request_sock_ops tcp_request_sock_ipv6_ops = {
.route_req = tcp_v6_route_req,
.init_seq = tcp_v6_init_sequence,
.send_synack = tcp_v6_send_synack,
.queue_hash_add = inet6_csk_reqsk_queue_hash_add,
};
static void tcp_v6_send_response(const struct sock *sk, struct sk_buff *skb, u32 seq,
@ -938,37 +937,11 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
}
static struct sock *tcp_v6_hnd_req(struct sock *sk, struct sk_buff *skb)
static struct sock *tcp_v6_cookie_check(struct sock *sk, struct sk_buff *skb)
{
const struct tcphdr *th = tcp_hdr(skb);
struct request_sock *req;
struct sock *nsk;
/* Find possible connection requests. */
req = inet6_csk_search_req(sk, th->source,
&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr, tcp_v6_iif(skb));
if (req) {
nsk = tcp_check_req(sk, skb, req, false);
if (!nsk || nsk == sk)
reqsk_put(req);
return nsk;
}
nsk = __inet6_lookup_established(sock_net(sk), &tcp_hashinfo,
&ipv6_hdr(skb)->saddr, th->source,
&ipv6_hdr(skb)->daddr, ntohs(th->dest),
tcp_v6_iif(skb));
if (nsk) {
if (nsk->sk_state != TCP_TIME_WAIT) {
bh_lock_sock(nsk);
return nsk;
}
inet_twsk_put(inet_twsk(nsk));
return NULL;
}
#ifdef CONFIG_SYN_COOKIES
const struct tcphdr *th = tcp_hdr(skb);
if (!th->syn)
sk = cookie_v6_check(sk, skb);
#endif
@ -1258,15 +1231,11 @@ static int tcp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
goto csum_err;
if (sk->sk_state == TCP_LISTEN) {
struct sock *nsk = tcp_v6_hnd_req(sk, skb);
struct sock *nsk = tcp_v6_cookie_check(sk, skb);
if (!nsk)
goto discard;
/*
* Queue it on the new socket if the new socket is active,
* otherwise we just shortcircuit this and continue with
* the new socket..
*/
if (nsk != sk) {
sock_rps_save_rxhash(nsk, skb);
sk_mark_napi_id(nsk, skb);
@ -1402,6 +1371,33 @@ process:
if (sk->sk_state == TCP_TIME_WAIT)
goto do_time_wait;
if (sk->sk_state == TCP_NEW_SYN_RECV) {
struct request_sock *req = inet_reqsk(sk);
struct sock *nsk = NULL;
sk = req->rsk_listener;
tcp_v6_fill_cb(skb, hdr, th);
if (tcp_v6_inbound_md5_hash(sk, skb)) {
reqsk_put(req);
goto discard_it;
}
if (sk->sk_state == TCP_LISTEN)
nsk = tcp_check_req(sk, skb, req, false);
if (!nsk) {
reqsk_put(req);
goto discard_it;
}
if (nsk == sk) {
sock_hold(sk);
reqsk_put(req);
tcp_v6_restore_cb(skb);
} else if (tcp_child_process(sk, nsk, skb)) {
tcp_v6_send_reset(nsk, skb);
goto discard_it;
} else {
return 0;
}
}
if (hdr->hop_limit < inet6_sk(sk)->min_hopcount) {
NET_INC_STATS_BH(net, LINUX_MIB_TCPMINTTLDROP);
goto discard_and_relse;
@ -1765,18 +1761,12 @@ static int tcp6_seq_show(struct seq_file *seq, void *v)
}
st = seq->private;
switch (st->state) {
case TCP_SEQ_STATE_LISTENING:
case TCP_SEQ_STATE_ESTABLISHED:
if (sk->sk_state == TCP_TIME_WAIT)
get_timewait6_sock(seq, v, st->num);
else if (sk->sk_state == TCP_NEW_SYN_RECV)
get_openreq6(seq, v, st->num);
else
get_tcp6_sock(seq, v, st->num);
break;
case TCP_SEQ_STATE_OPENREQ:
get_openreq6(seq, v, st->num);
break;
}
out:
return 0;
}