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tcp: Move timestamps from inetpeer to metrics cache.

Browse Source 
With help from Lin Ming.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2012-07-10 03:14:24 -07:00
parent 94334d5ed4
commit 81166dd6fa
9 changed files with 149 additions and 127 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/inetpeer.h
View File

@ -46,15 +46,13 @@ struct inet_peer {
};
/*
* Once inet_peer is queued for deletion (refcnt == -1), following fields
* are not available: rid, ip_id_count, tcp_ts, tcp_ts_stamp
* are not available: rid, ip_id_count
* We can share memory with rcu_head to help keep inet_peer small.
*/
union {
struct {
atomic_t rid; /* Frag reception counter */
atomic_t ip_id_count; /* IP ID for the next packet */
__u32 tcp_ts;
__u32 tcp_ts_stamp;
};
struct rcu_head rcu;
struct inet_peer *gc_next;

5
include/net/tcp.h
View File

@ -390,7 +390,10 @@ extern void tcp_clear_retrans(struct tcp_sock *tp);
extern void tcp_update_metrics(struct sock *sk);
extern void tcp_init_metrics(struct sock *sk);
extern void tcp_metrics_init(void);
extern bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst);
extern bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, bool paws_check);
extern bool tcp_remember_stamp(struct sock *sk);
extern bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw);
extern void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst);
extern void tcp_disable_fack(struct tcp_sock *tp);
extern void tcp_close(struct sock *sk, long timeout);
extern void tcp_init_sock(struct sock *sk);

1
net/ipv4/inetpeer.c
View File

@ -508,7 +508,6 @@ relookup:
(daddr->family == AF_INET) ?
secure_ip_id(daddr->addr.a4) :
secure_ipv6_id(daddr->addr.a6));
p->tcp_ts_stamp = 0;
p->metrics[RTAX_LOCK-1] = INETPEER_METRICS_NEW;
p->rate_tokens = 0;
p->rate_last = 0;

8
net/ipv4/route.c
View File

@ -2846,7 +2846,7 @@ static int rt_fill_info(struct net *net,
struct rtmsg *r;
struct nlmsghdr *nlh;
unsigned long expires = 0;
u32 id = 0, ts = 0, tsage = 0, error;
u32 id = 0, error;
nlh = nlmsg_put(skb, pid, seq, event, sizeof(*r), flags);
if (nlh == NULL)
@ -2903,10 +2903,6 @@ static int rt_fill_info(struct net *net,
const struct inet_peer *peer = rt_peer_ptr(rt);
inet_peer_refcheck(peer);
id = atomic_read(&peer->ip_id_count) & 0xffff;
if (peer->tcp_ts_stamp) {
ts = peer->tcp_ts;
tsage = get_seconds() - peer->tcp_ts_stamp;
}
expires = ACCESS_ONCE(peer->pmtu_expires);
if (expires) {
if (time_before(jiffies, expires))
@ -2942,7 +2938,7 @@ static int rt_fill_info(struct net *net,
goto nla_put_failure;
}
if (rtnl_put_cacheinfo(skb, &rt->dst, id, ts, tsage,
if (rtnl_put_cacheinfo(skb, &rt->dst, id, 0, 0,
expires, error) < 0)
goto nla_put_failure;

30
net/ipv4/tcp_ipv4.c
View File

@ -209,22 +209,8 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
}
if (tcp_death_row.sysctl_tw_recycle &&
!tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr) {
struct inet_peer *peer = rt_get_peer(rt, fl4->daddr);
/*
* VJ's idea. We save last timestamp seen from
* the destination in peer table, when entering state
* TIME-WAIT * and initialize rx_opt.ts_recent from it,
* when trying new connection.
*/
if (peer) {
inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
tp->rx_opt.ts_recent = peer->tcp_ts;
}
}
}
!tp->rx_opt.ts_recent_stamp && fl4->daddr == daddr)
tcp_fetch_timewait_stamp(sk, &rt->dst);
inet->inet_dport = usin->sin_port;
inet->inet_daddr = daddr;
@ -1375,7 +1361,6 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
isn = cookie_v4_init_sequence(sk, skb, &req->mss);
req->cookie_ts = tmp_opt.tstamp_ok;
} else if (!isn) {
struct inet_peer *peer = NULL;
struct flowi4 fl4;
/* VJ's idea. We save last timestamp seen
@ -1390,12 +1375,8 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
if (tmp_opt.saw_tstamp &&
tcp_death_row.sysctl_tw_recycle &&
(dst = inet_csk_route_req(sk, &fl4, req, want_cookie)) != NULL &&
fl4.daddr == saddr &&
(peer = rt_get_peer((struct rtable *)dst, fl4.daddr)) != NULL) {
inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
(s32)(peer->tcp_ts - req->ts_recent) >
TCP_PAWS_WINDOW) {
fl4.daddr == saddr) {
if (!tcp_peer_is_proven(req, dst, true)) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
goto drop_and_release;
}
@ -1404,8 +1385,7 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
else if (!sysctl_tcp_syncookies &&
(sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
(sysctl_max_syn_backlog >> 2)) &&
(!peer || !peer->tcp_ts_stamp) &&
!tcp_peer_is_proven(req, dst)) {
!tcp_peer_is_proven(req, dst, false)) {
/* Without syncookies last quarter of
* backlog is filled with destinations,
* proven to be alive.

136
net/ipv4/tcp_metrics.c
View File

@ -34,6 +34,8 @@ struct tcp_metrics_block {
struct tcp_metrics_block __rcu *tcpm_next;
struct inetpeer_addr tcpm_addr;
unsigned long tcpm_stamp;
u32 tcpm_ts;
u32 tcpm_ts_stamp;
u32 tcpm_lock;
u32 tcpm_vals[TCP_METRIC_MAX];
};
@ -114,6 +116,8 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst)
tm->tcpm_vals[TCP_METRIC_SSTHRESH] = dst_metric_raw(dst, RTAX_SSTHRESH);
tm->tcpm_vals[TCP_METRIC_CWND] = dst_metric_raw(dst, RTAX_CWND);
tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING);
tm->tcpm_ts = 0;
tm->tcpm_ts_stamp = 0;
}
static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst,
@ -230,6 +234,45 @@ static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req,
return tm;
}
static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock *tw)
{
struct inet6_timewait_sock *tw6;
struct tcp_metrics_block *tm;
struct inetpeer_addr addr;
unsigned int hash;
struct net *net;
addr.family = tw->tw_family;
switch (addr.family) {
case AF_INET:
addr.addr.a4 = tw->tw_daddr;
hash = (__force unsigned int) addr.addr.a4;
break;
case AF_INET6:
tw6 = inet6_twsk((struct sock *)tw);
*(struct in6_addr *)addr.addr.a6 = tw6->tw_v6_daddr;
hash = ((__force unsigned int) addr.addr.a6[0] ^
(__force unsigned int) addr.addr.a6[1] ^
(__force unsigned int) addr.addr.a6[2] ^
(__force unsigned int) addr.addr.a6[3]);
break;
default:
return NULL;
}
hash ^= (hash >> 24) ^ (hash >> 16) ^ (hash >> 8);
net = twsk_net(tw);
hash &= net->ipv4.tcp_metrics_hash_mask;
for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
tm = rcu_dereference(tm->tcpm_next)) {
if (addr_same(&tm->tcpm_addr, &addr))
break;
}
return tm;
}
static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk,
struct dst_entry *dst,
bool create)
@ -496,7 +539,7 @@ reset:
tp->snd_cwnd_stamp = tcp_time_stamp;
}
bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst)
bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, bool paws_check)
{
struct tcp_metrics_block *tm;
bool ret;
@ -506,16 +549,99 @@ bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst)
rcu_read_lock();
tm = __tcp_get_metrics_req(req, dst);
if (tm && tcp_metric_get(tm, TCP_METRIC_RTT))
ret = true;
else
ret = false;
if (paws_check) {
if (tm &&
(u32)get_seconds() - tm->tcpm_ts_stamp < TCP_PAWS_MSL &&
(s32)(tm->tcpm_ts - req->ts_recent) > TCP_PAWS_WINDOW)
ret = false;
else
ret = true;
} else {
if (tm && tcp_metric_get(tm, TCP_METRIC_RTT) && tm->tcpm_ts_stamp)
ret = true;
else
ret = false;
}
rcu_read_unlock();
return ret;
}
EXPORT_SYMBOL_GPL(tcp_peer_is_proven);
void tcp_fetch_timewait_stamp(struct sock *sk, struct dst_entry *dst)
{
struct tcp_metrics_block *tm;
rcu_read_lock();
tm = tcp_get_metrics(sk, dst, true);
if (tm) {
struct tcp_sock *tp = tcp_sk(sk);
if ((u32)get_seconds() - tm->tcpm_ts_stamp <= TCP_PAWS_MSL) {
tp->rx_opt.ts_recent_stamp = tm->tcpm_ts_stamp;
tp->rx_opt.ts_recent = tm->tcpm_ts;
}
}
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(tcp_fetch_timewait_stamp);
/* VJ's idea. Save last timestamp seen from this destination and hold
* it at least for normal timewait interval to use for duplicate
* segment detection in subsequent connections, before they enter
* synchronized state.
*/
bool tcp_remember_stamp(struct sock *sk)
{
struct dst_entry *dst = __sk_dst_get(sk);
bool ret = false;
if (dst) {
struct tcp_metrics_block *tm;
rcu_read_lock();
tm = tcp_get_metrics(sk, dst, true);
if (tm) {
struct tcp_sock *tp = tcp_sk(sk);
if ((s32)(tm->tcpm_ts - tp->rx_opt.ts_recent) <= 0 ||
((u32)get_seconds() - tm->tcpm_ts_stamp > TCP_PAWS_MSL &&
tm->tcpm_ts_stamp <= (u32)tp->rx_opt.ts_recent_stamp)) {
tm->tcpm_ts_stamp = (u32)tp->rx_opt.ts_recent_stamp;
tm->tcpm_ts = tp->rx_opt.ts_recent;
}
ret = true;
}
rcu_read_unlock();
}
return ret;
}
bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw)
{
struct tcp_metrics_block *tm;
bool ret = false;
rcu_read_lock();
tm = __tcp_get_metrics_tw(tw);
if (tw) {
const struct tcp_timewait_sock *tcptw;
struct sock *sk = (struct sock *) tw;
tcptw = tcp_twsk(sk);
if ((s32)(tm->tcpm_ts - tcptw->tw_ts_recent) <= 0 ||
((u32)get_seconds() - tm->tcpm_ts_stamp > TCP_PAWS_MSL &&
tm->tcpm_ts_stamp <= (u32)tcptw->tw_ts_recent_stamp)) {
tm->tcpm_ts_stamp = (u32)tcptw->tw_ts_recent_stamp;
tm->tcpm_ts = tcptw->tw_ts_recent;
}
ret = true;
}
rcu_read_unlock();
return ret;
}
static unsigned long tcpmhash_entries;
static int __init set_tcpmhash_entries(char *str)
{

46
net/ipv4/tcp_minisocks.c
View File

@ -49,52 +49,6 @@ struct inet_timewait_death_row tcp_death_row = {
};
EXPORT_SYMBOL_GPL(tcp_death_row);
/* VJ's idea. Save last timestamp seen from this destination
* and hold it at least for normal timewait interval to use for duplicate
* segment detection in subsequent connections, before they enter synchronized
* state.
*/
static bool tcp_remember_stamp(struct sock *sk)
{
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct inet_peer *peer;
peer = icsk->icsk_af_ops->get_peer(sk);
if (peer) {
if ((s32)(peer->tcp_ts - tp->rx_opt.ts_recent) <= 0 ||
((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
peer->tcp_ts_stamp <= (u32)tp->rx_opt.ts_recent_stamp)) {
peer->tcp_ts_stamp = (u32)tp->rx_opt.ts_recent_stamp;
peer->tcp_ts = tp->rx_opt.ts_recent;
}
return true;
}
return false;
}
static bool tcp_tw_remember_stamp(struct inet_timewait_sock *tw)
{
const struct tcp_timewait_sock *tcptw;
struct sock *sk = (struct sock *) tw;
struct inet_peer *peer;
tcptw = tcp_twsk(sk);
peer = tcptw->tw_peer;
if (peer) {
if ((s32)(peer->tcp_ts - tcptw->tw_ts_recent) <= 0 ||
((u32)get_seconds() - peer->tcp_ts_stamp > TCP_PAWS_MSL &&
peer->tcp_ts_stamp <= (u32)tcptw->tw_ts_recent_stamp)) {
peer->tcp_ts_stamp = (u32)tcptw->tw_ts_recent_stamp;
peer->tcp_ts = tcptw->tw_ts_recent;
}
return true;
}
return false;
}
static bool tcp_in_window(u32 seq, u32 end_seq, u32 s_win, u32 e_win)
{
if (seq == s_win)

13
net/ipv6/route.c
View File

@ -2348,13 +2348,11 @@ static int rt6_fill_node(struct net *net,
int iif, int type, u32 pid, u32 seq,
int prefix, int nowait, unsigned int flags)
{
const struct inet_peer *peer;
struct rtmsg *rtm;
struct nlmsghdr *nlh;
long expires;
u32 table;
struct neighbour *n;
u32 ts, tsage;
if (prefix) { /* user wants prefix routes only */
if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
@ -2473,16 +2471,7 @@ static int rt6_fill_node(struct net *net,
else
expires = INT_MAX;
peer = NULL;
if (rt6_has_peer(rt))
peer = rt6_peer_ptr(rt);
ts = tsage = 0;
if (peer && peer->tcp_ts_stamp) {
ts = peer->tcp_ts;
tsage = get_seconds() - peer->tcp_ts_stamp;
}
if (rtnl_put_cacheinfo(skb, &rt->dst, 0, ts, tsage,
if (rtnl_put_cacheinfo(skb, &rt->dst, 0, 0, 0,
expires, rt->dst.error) < 0)
goto nla_put_failure;

33
net/ipv6/tcp_ipv6.c
View File

@ -277,22 +277,8 @@ static int tcp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
rt = (struct rt6_info *) dst;
if (tcp_death_row.sysctl_tw_recycle &&
!tp->rx_opt.ts_recent_stamp &&
ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr)) {
struct inet_peer *peer = rt6_get_peer(rt);
/*
* VJ's idea. We save last timestamp seen from
* the destination in peer table, when entering state
* TIME-WAIT * and initialize rx_opt.ts_recent from it,
* when trying new connection.
*/
if (peer) {
inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp <= TCP_PAWS_MSL) {
tp->rx_opt.ts_recent_stamp = peer->tcp_ts_stamp;
tp->rx_opt.ts_recent = peer->tcp_ts;
}
}
}
ipv6_addr_equal(&rt->rt6i_dst.addr, &np->daddr))
tcp_fetch_timewait_stamp(sk, dst);
icsk->icsk_ext_hdr_len = 0;
if (np->opt)
@ -1134,8 +1120,6 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
treq->iif = inet6_iif(skb);
if (!isn) {
struct inet_peer *peer = NULL;
if (ipv6_opt_accepted(sk, skb) ||
np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
@ -1160,14 +1144,8 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
*/
if (tmp_opt.saw_tstamp &&
tcp_death_row.sysctl_tw_recycle &&
(dst = inet6_csk_route_req(sk, &fl6, req)) != NULL &&
(peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
&treq->rmt_addr)) {
inet_peer_refcheck(peer);
if ((u32)get_seconds() - peer->tcp_ts_stamp < TCP_PAWS_MSL &&
(s32)(peer->tcp_ts - req->ts_recent) >
TCP_PAWS_WINDOW) {
(dst = inet6_csk_route_req(sk, &fl6, req)) != NULL) {
if (!tcp_peer_is_proven(req, dst, true)) {
NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_PAWSPASSIVEREJECTED);
goto drop_and_release;
}
@ -1176,8 +1154,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
else if (!sysctl_tcp_syncookies &&
(sysctl_max_syn_backlog - inet_csk_reqsk_queue_len(sk) <
(sysctl_max_syn_backlog >> 2)) &&
(!peer || !peer->tcp_ts_stamp) &&
!tcp_peer_is_proven(req, dst)) {
!tcp_peer_is_proven(req, dst, false)) {
/* Without syncookies last quarter of
* backlog is filled with destinations,
* proven to be alive.