diff options
Diffstat (limited to 'net/ipv4/tcp_metrics.c')
| -rw-r--r-- | net/ipv4/tcp_metrics.c | 166 |
1 files changed, 95 insertions, 71 deletions
diff --git a/net/ipv4/tcp_metrics.c b/net/ipv4/tcp_metrics.c index fa950941de6..4fe04180598 100644 --- a/net/ipv4/tcp_metrics.c +++ b/net/ipv4/tcp_metrics.c @@ -33,6 +33,11 @@ struct tcp_fastopen_metrics { struct tcp_fastopen_cookie cookie; }; +/* TCP_METRIC_MAX includes 2 extra fields for userspace compatibility + * Kernel only stores RTT and RTTVAR in usec resolution + */ +#define TCP_METRIC_MAX_KERNEL (TCP_METRIC_MAX - 2) + struct tcp_metrics_block { struct tcp_metrics_block __rcu *tcpm_next; struct inetpeer_addr tcpm_saddr; @@ -41,7 +46,7 @@ struct tcp_metrics_block { u32 tcpm_ts; u32 tcpm_ts_stamp; u32 tcpm_lock; - u32 tcpm_vals[TCP_METRIC_MAX + 1]; + u32 tcpm_vals[TCP_METRIC_MAX_KERNEL + 1]; struct tcp_fastopen_metrics tcpm_fastopen; struct rcu_head rcu_head; @@ -59,12 +64,6 @@ static u32 tcp_metric_get(struct tcp_metrics_block *tm, return tm->tcpm_vals[idx]; } -static u32 tcp_metric_get_jiffies(struct tcp_metrics_block *tm, - enum tcp_metric_index idx) -{ - return msecs_to_jiffies(tm->tcpm_vals[idx]); -} - static void tcp_metric_set(struct tcp_metrics_block *tm, enum tcp_metric_index idx, u32 val) @@ -72,13 +71,6 @@ static void tcp_metric_set(struct tcp_metrics_block *tm, tm->tcpm_vals[idx] = val; } -static void tcp_metric_set_msecs(struct tcp_metrics_block *tm, - enum tcp_metric_index idx, - u32 val) -{ - tm->tcpm_vals[idx] = jiffies_to_msecs(val); -} - static bool addr_same(const struct inetpeer_addr *a, const struct inetpeer_addr *b) { @@ -101,9 +93,11 @@ struct tcpm_hash_bucket { static DEFINE_SPINLOCK(tcp_metrics_lock); -static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst, +static void tcpm_suck_dst(struct tcp_metrics_block *tm, + const struct dst_entry *dst, bool fastopen_clear) { + u32 msval; u32 val; tm->tcpm_stamp = jiffies; @@ -121,8 +115,11 @@ static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst, val |= 1 << TCP_METRIC_REORDERING; tm->tcpm_lock = val; - tm->tcpm_vals[TCP_METRIC_RTT] = dst_metric_raw(dst, RTAX_RTT); - tm->tcpm_vals[TCP_METRIC_RTTVAR] = dst_metric_raw(dst, RTAX_RTTVAR); + msval = dst_metric_raw(dst, RTAX_RTT); + tm->tcpm_vals[TCP_METRIC_RTT] = msval * USEC_PER_MSEC; + + msval = dst_metric_raw(dst, RTAX_RTTVAR); + tm->tcpm_vals[TCP_METRIC_RTTVAR] = msval * USEC_PER_MSEC; 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); @@ -274,24 +271,32 @@ static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock unsigned int hash; struct net *net; - saddr.family = tw->tw_family; - daddr.family = tw->tw_family; - switch (daddr.family) { - case AF_INET: + if (tw->tw_family == AF_INET) { + saddr.family = AF_INET; saddr.addr.a4 = tw->tw_rcv_saddr; + daddr.family = AF_INET; daddr.addr.a4 = tw->tw_daddr; hash = (__force unsigned int) daddr.addr.a4; - break; + } #if IS_ENABLED(CONFIG_IPV6) - case AF_INET6: - *(struct in6_addr *)saddr.addr.a6 = tw->tw_v6_rcv_saddr; - *(struct in6_addr *)daddr.addr.a6 = tw->tw_v6_daddr; - hash = ipv6_addr_hash(&tw->tw_v6_daddr); - break; + else if (tw->tw_family == AF_INET6) { + if (ipv6_addr_v4mapped(&tw->tw_v6_daddr)) { + saddr.family = AF_INET; + saddr.addr.a4 = tw->tw_rcv_saddr; + daddr.family = AF_INET; + daddr.addr.a4 = tw->tw_daddr; + hash = (__force unsigned int) daddr.addr.a4; + } else { + saddr.family = AF_INET6; + *(struct in6_addr *)saddr.addr.a6 = tw->tw_v6_rcv_saddr; + daddr.family = AF_INET6; + *(struct in6_addr *)daddr.addr.a6 = tw->tw_v6_daddr; + hash = ipv6_addr_hash(&tw->tw_v6_daddr); + } + } #endif - default: + else return NULL; - } net = twsk_net(tw); hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log); @@ -314,24 +319,32 @@ static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk, unsigned int hash; struct net *net; - saddr.family = sk->sk_family; - daddr.family = sk->sk_family; - switch (daddr.family) { - case AF_INET: + if (sk->sk_family == AF_INET) { + saddr.family = AF_INET; saddr.addr.a4 = inet_sk(sk)->inet_saddr; + daddr.family = AF_INET; daddr.addr.a4 = inet_sk(sk)->inet_daddr; hash = (__force unsigned int) daddr.addr.a4; - break; + } #if IS_ENABLED(CONFIG_IPV6) - case AF_INET6: - *(struct in6_addr *)saddr.addr.a6 = sk->sk_v6_rcv_saddr; - *(struct in6_addr *)daddr.addr.a6 = sk->sk_v6_daddr; - hash = ipv6_addr_hash(&sk->sk_v6_daddr); - break; + else if (sk->sk_family == AF_INET6) { + if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) { + saddr.family = AF_INET; + saddr.addr.a4 = inet_sk(sk)->inet_saddr; + daddr.family = AF_INET; + daddr.addr.a4 = inet_sk(sk)->inet_daddr; + hash = (__force unsigned int) daddr.addr.a4; + } else { + saddr.family = AF_INET6; + *(struct in6_addr *)saddr.addr.a6 = sk->sk_v6_rcv_saddr; + daddr.family = AF_INET6; + *(struct in6_addr *)daddr.addr.a6 = sk->sk_v6_daddr; + hash = ipv6_addr_hash(&sk->sk_v6_daddr); + } + } #endif - default: + else return NULL; - } net = dev_net(dst->dev); hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log); @@ -368,7 +381,7 @@ void tcp_update_metrics(struct sock *sk) dst_confirm(dst); rcu_read_lock(); - if (icsk->icsk_backoff || !tp->srtt) { + if (icsk->icsk_backoff || !tp->srtt_us) { /* This session failed to estimate rtt. Why? * Probably, no packets returned in time. Reset our * results. @@ -383,8 +396,8 @@ void tcp_update_metrics(struct sock *sk) if (!tm) goto out_unlock; - rtt = tcp_metric_get_jiffies(tm, TCP_METRIC_RTT); - m = rtt - tp->srtt; + rtt = tcp_metric_get(tm, TCP_METRIC_RTT); + m = rtt - tp->srtt_us; /* If newly calculated rtt larger than stored one, store new * one. Otherwise, use EWMA. Remember, rtt overestimation is @@ -392,10 +405,10 @@ void tcp_update_metrics(struct sock *sk) */ if (!tcp_metric_locked(tm, TCP_METRIC_RTT)) { if (m <= 0) - rtt = tp->srtt; + rtt = tp->srtt_us; else rtt -= (m >> 3); - tcp_metric_set_msecs(tm, TCP_METRIC_RTT, rtt); + tcp_metric_set(tm, TCP_METRIC_RTT, rtt); } if (!tcp_metric_locked(tm, TCP_METRIC_RTTVAR)) { @@ -406,16 +419,16 @@ void tcp_update_metrics(struct sock *sk) /* Scale deviation to rttvar fixed point */ m >>= 1; - if (m < tp->mdev) - m = tp->mdev; + if (m < tp->mdev_us) + m = tp->mdev_us; - var = tcp_metric_get_jiffies(tm, TCP_METRIC_RTTVAR); + var = tcp_metric_get(tm, TCP_METRIC_RTTVAR); if (m >= var) var = m; else var -= (var - m) >> 2; - tcp_metric_set_msecs(tm, TCP_METRIC_RTTVAR, var); + tcp_metric_set(tm, TCP_METRIC_RTTVAR, var); } if (tcp_in_initial_slowstart(tp)) { @@ -512,7 +525,7 @@ void tcp_init_metrics(struct sock *sk) tp->reordering = val; } - crtt = tcp_metric_get_jiffies(tm, TCP_METRIC_RTT); + crtt = tcp_metric_get(tm, TCP_METRIC_RTT); rcu_read_unlock(); reset: /* The initial RTT measurement from the SYN/SYN-ACK is not ideal @@ -535,18 +548,20 @@ reset: * to low value, and then abruptly stops to do it and starts to delay * ACKs, wait for troubles. */ - if (crtt > tp->srtt) { + if (crtt > tp->srtt_us) { /* Set RTO like tcp_rtt_estimator(), but from cached RTT. */ - crtt >>= 3; + crtt /= 8 * USEC_PER_MSEC; inet_csk(sk)->icsk_rto = crtt + max(2 * crtt, tcp_rto_min(sk)); - } else if (tp->srtt == 0) { + } else if (tp->srtt_us == 0) { /* RFC6298: 5.7 We've failed to get a valid RTT sample from * 3WHS. This is most likely due to retransmission, * including spurious one. Reset the RTO back to 3secs * from the more aggressive 1sec to avoid more spurious * retransmission. */ - tp->mdev = tp->mdev_max = tp->rttvar = TCP_TIMEOUT_FALLBACK; + tp->rttvar_us = jiffies_to_usecs(TCP_TIMEOUT_FALLBACK); + tp->mdev_us = tp->mdev_max_us = tp->rttvar_us; + inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK; } /* Cut cwnd down to 1 per RFC5681 if SYN or SYN-ACK has been @@ -793,10 +808,26 @@ static int tcp_metrics_fill_info(struct sk_buff *msg, nest = nla_nest_start(msg, TCP_METRICS_ATTR_VALS); if (!nest) goto nla_put_failure; - for (i = 0; i < TCP_METRIC_MAX + 1; i++) { - if (!tm->tcpm_vals[i]) + for (i = 0; i < TCP_METRIC_MAX_KERNEL + 1; i++) { + u32 val = tm->tcpm_vals[i]; + + if (!val) continue; - if (nla_put_u32(msg, i + 1, tm->tcpm_vals[i]) < 0) + if (i == TCP_METRIC_RTT) { + if (nla_put_u32(msg, TCP_METRIC_RTT_US + 1, + val) < 0) + goto nla_put_failure; + n++; + val = max(val / 1000, 1U); + } + if (i == TCP_METRIC_RTTVAR) { + if (nla_put_u32(msg, TCP_METRIC_RTTVAR_US + 1, + val) < 0) + goto nla_put_failure; + n++; + val = max(val / 1000, 1U); + } + if (nla_put_u32(msg, i + 1, val) < 0) goto nla_put_failure; n++; } @@ -1019,13 +1050,13 @@ static int tcp_metrics_flush_all(struct net *net) static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info) { struct tcpm_hash_bucket *hb; - struct tcp_metrics_block *tm, *tmlist = NULL; + struct tcp_metrics_block *tm; struct tcp_metrics_block __rcu **pp; struct inetpeer_addr saddr, daddr; unsigned int hash; struct net *net = genl_info_net(info); int ret; - bool src = true; + bool src = true, found = false; ret = parse_nl_addr(info, &daddr, &hash, 1); if (ret < 0) @@ -1044,19 +1075,15 @@ static int tcp_metrics_nl_cmd_del(struct sk_buff *skb, struct genl_info *info) if (addr_same(&tm->tcpm_daddr, &daddr) && (!src || addr_same(&tm->tcpm_saddr, &saddr))) { *pp = tm->tcpm_next; - tm->tcpm_next = tmlist; - tmlist = tm; + kfree_rcu(tm, rcu_head); + found = true; } else { pp = &tm->tcpm_next; } } spin_unlock_bh(&tcp_metrics_lock); - if (!tmlist) + if (!found) return -ESRCH; - for (tm = tmlist; tm; tm = tmlist) { - tmlist = tm->tcpm_next; - kfree_rcu(tm, rcu_head); - } return 0; } @@ -1132,10 +1159,7 @@ static void __net_exit tcp_net_metrics_exit(struct net *net) tm = next; } } - if (is_vmalloc_addr(net->ipv4.tcp_metrics_hash)) - vfree(net->ipv4.tcp_metrics_hash); - else - kfree(net->ipv4.tcp_metrics_hash); + kvfree(net->ipv4.tcp_metrics_hash); } static __net_initdata struct pernet_operations tcp_net_metrics_ops = { |