mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
2c42a3fb30
Fix double sizeof when parsing IPv6 address from user space because it breaks get/del by specific IPv6 address. Problem noticed by David Binderman: https://bugzilla.kernel.org/show_bug.cgi?id=49171 Signed-off-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: David S. Miller <davem@davemloft.net>
1086 lines
27 KiB
C
1086 lines
27 KiB
C
#include <linux/rcupdate.h>
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#include <linux/spinlock.h>
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#include <linux/jiffies.h>
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#include <linux/bootmem.h>
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#include <linux/module.h>
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#include <linux/cache.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/tcp.h>
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#include <linux/hash.h>
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#include <linux/tcp_metrics.h>
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#include <net/inet_connection_sock.h>
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#include <net/net_namespace.h>
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#include <net/request_sock.h>
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#include <net/inetpeer.h>
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#include <net/sock.h>
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#include <net/ipv6.h>
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#include <net/dst.h>
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#include <net/tcp.h>
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#include <net/genetlink.h>
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int sysctl_tcp_nometrics_save __read_mostly;
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struct tcp_fastopen_metrics {
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u16 mss;
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u16 syn_loss:10; /* Recurring Fast Open SYN losses */
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unsigned long last_syn_loss; /* Last Fast Open SYN loss */
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struct tcp_fastopen_cookie cookie;
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};
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struct tcp_metrics_block {
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struct tcp_metrics_block __rcu *tcpm_next;
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struct inetpeer_addr tcpm_addr;
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unsigned long tcpm_stamp;
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u32 tcpm_ts;
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u32 tcpm_ts_stamp;
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u32 tcpm_lock;
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u32 tcpm_vals[TCP_METRIC_MAX + 1];
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struct tcp_fastopen_metrics tcpm_fastopen;
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struct rcu_head rcu_head;
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};
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static bool tcp_metric_locked(struct tcp_metrics_block *tm,
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enum tcp_metric_index idx)
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{
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return tm->tcpm_lock & (1 << idx);
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}
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static u32 tcp_metric_get(struct tcp_metrics_block *tm,
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enum tcp_metric_index idx)
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{
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return tm->tcpm_vals[idx];
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}
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static u32 tcp_metric_get_jiffies(struct tcp_metrics_block *tm,
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enum tcp_metric_index idx)
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{
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return msecs_to_jiffies(tm->tcpm_vals[idx]);
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}
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static void tcp_metric_set(struct tcp_metrics_block *tm,
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enum tcp_metric_index idx,
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u32 val)
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{
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tm->tcpm_vals[idx] = val;
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}
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static void tcp_metric_set_msecs(struct tcp_metrics_block *tm,
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enum tcp_metric_index idx,
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u32 val)
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{
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tm->tcpm_vals[idx] = jiffies_to_msecs(val);
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}
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static bool addr_same(const struct inetpeer_addr *a,
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const struct inetpeer_addr *b)
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{
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const struct in6_addr *a6, *b6;
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if (a->family != b->family)
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return false;
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if (a->family == AF_INET)
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return a->addr.a4 == b->addr.a4;
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a6 = (const struct in6_addr *) &a->addr.a6[0];
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b6 = (const struct in6_addr *) &b->addr.a6[0];
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return ipv6_addr_equal(a6, b6);
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}
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struct tcpm_hash_bucket {
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struct tcp_metrics_block __rcu *chain;
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};
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static DEFINE_SPINLOCK(tcp_metrics_lock);
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static void tcpm_suck_dst(struct tcp_metrics_block *tm, struct dst_entry *dst)
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{
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u32 val;
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tm->tcpm_stamp = jiffies;
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val = 0;
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if (dst_metric_locked(dst, RTAX_RTT))
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val |= 1 << TCP_METRIC_RTT;
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if (dst_metric_locked(dst, RTAX_RTTVAR))
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val |= 1 << TCP_METRIC_RTTVAR;
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if (dst_metric_locked(dst, RTAX_SSTHRESH))
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val |= 1 << TCP_METRIC_SSTHRESH;
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if (dst_metric_locked(dst, RTAX_CWND))
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val |= 1 << TCP_METRIC_CWND;
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if (dst_metric_locked(dst, RTAX_REORDERING))
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val |= 1 << TCP_METRIC_REORDERING;
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tm->tcpm_lock = val;
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tm->tcpm_vals[TCP_METRIC_RTT] = dst_metric_raw(dst, RTAX_RTT);
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tm->tcpm_vals[TCP_METRIC_RTTVAR] = dst_metric_raw(dst, RTAX_RTTVAR);
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tm->tcpm_vals[TCP_METRIC_SSTHRESH] = dst_metric_raw(dst, RTAX_SSTHRESH);
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tm->tcpm_vals[TCP_METRIC_CWND] = dst_metric_raw(dst, RTAX_CWND);
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tm->tcpm_vals[TCP_METRIC_REORDERING] = dst_metric_raw(dst, RTAX_REORDERING);
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tm->tcpm_ts = 0;
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tm->tcpm_ts_stamp = 0;
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tm->tcpm_fastopen.mss = 0;
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tm->tcpm_fastopen.syn_loss = 0;
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tm->tcpm_fastopen.cookie.len = 0;
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}
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static struct tcp_metrics_block *tcpm_new(struct dst_entry *dst,
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struct inetpeer_addr *addr,
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unsigned int hash,
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bool reclaim)
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{
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struct tcp_metrics_block *tm;
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struct net *net;
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spin_lock_bh(&tcp_metrics_lock);
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net = dev_net(dst->dev);
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if (unlikely(reclaim)) {
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struct tcp_metrics_block *oldest;
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oldest = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain);
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for (tm = rcu_dereference(oldest->tcpm_next); tm;
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tm = rcu_dereference(tm->tcpm_next)) {
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if (time_before(tm->tcpm_stamp, oldest->tcpm_stamp))
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oldest = tm;
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}
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tm = oldest;
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} else {
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tm = kmalloc(sizeof(*tm), GFP_ATOMIC);
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if (!tm)
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goto out_unlock;
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}
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tm->tcpm_addr = *addr;
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tcpm_suck_dst(tm, dst);
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if (likely(!reclaim)) {
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tm->tcpm_next = net->ipv4.tcp_metrics_hash[hash].chain;
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rcu_assign_pointer(net->ipv4.tcp_metrics_hash[hash].chain, tm);
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}
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out_unlock:
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spin_unlock_bh(&tcp_metrics_lock);
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return tm;
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}
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#define TCP_METRICS_TIMEOUT (60 * 60 * HZ)
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static void tcpm_check_stamp(struct tcp_metrics_block *tm, struct dst_entry *dst)
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{
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if (tm && unlikely(time_after(jiffies, tm->tcpm_stamp + TCP_METRICS_TIMEOUT)))
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tcpm_suck_dst(tm, dst);
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}
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#define TCP_METRICS_RECLAIM_DEPTH 5
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#define TCP_METRICS_RECLAIM_PTR (struct tcp_metrics_block *) 0x1UL
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static struct tcp_metrics_block *tcp_get_encode(struct tcp_metrics_block *tm, int depth)
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{
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if (tm)
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return tm;
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if (depth > TCP_METRICS_RECLAIM_DEPTH)
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return TCP_METRICS_RECLAIM_PTR;
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return NULL;
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}
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static struct tcp_metrics_block *__tcp_get_metrics(const struct inetpeer_addr *addr,
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struct net *net, unsigned int hash)
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{
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struct tcp_metrics_block *tm;
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int depth = 0;
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for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
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tm = rcu_dereference(tm->tcpm_next)) {
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if (addr_same(&tm->tcpm_addr, addr))
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break;
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depth++;
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}
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return tcp_get_encode(tm, depth);
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}
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static struct tcp_metrics_block *__tcp_get_metrics_req(struct request_sock *req,
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struct dst_entry *dst)
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{
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struct tcp_metrics_block *tm;
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struct inetpeer_addr addr;
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unsigned int hash;
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struct net *net;
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addr.family = req->rsk_ops->family;
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switch (addr.family) {
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case AF_INET:
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addr.addr.a4 = inet_rsk(req)->rmt_addr;
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hash = (__force unsigned int) addr.addr.a4;
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break;
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case AF_INET6:
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*(struct in6_addr *)addr.addr.a6 = inet6_rsk(req)->rmt_addr;
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hash = ipv6_addr_hash(&inet6_rsk(req)->rmt_addr);
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break;
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default:
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return NULL;
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}
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net = dev_net(dst->dev);
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hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);
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for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
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tm = rcu_dereference(tm->tcpm_next)) {
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if (addr_same(&tm->tcpm_addr, &addr))
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break;
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}
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tcpm_check_stamp(tm, dst);
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return tm;
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}
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static struct tcp_metrics_block *__tcp_get_metrics_tw(struct inet_timewait_sock *tw)
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{
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struct inet6_timewait_sock *tw6;
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struct tcp_metrics_block *tm;
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struct inetpeer_addr addr;
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unsigned int hash;
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struct net *net;
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addr.family = tw->tw_family;
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switch (addr.family) {
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case AF_INET:
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addr.addr.a4 = tw->tw_daddr;
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hash = (__force unsigned int) addr.addr.a4;
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break;
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case AF_INET6:
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tw6 = inet6_twsk((struct sock *)tw);
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*(struct in6_addr *)addr.addr.a6 = tw6->tw_v6_daddr;
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hash = ipv6_addr_hash(&tw6->tw_v6_daddr);
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break;
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default:
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return NULL;
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}
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net = twsk_net(tw);
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hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);
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for (tm = rcu_dereference(net->ipv4.tcp_metrics_hash[hash].chain); tm;
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tm = rcu_dereference(tm->tcpm_next)) {
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if (addr_same(&tm->tcpm_addr, &addr))
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break;
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}
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return tm;
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}
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static struct tcp_metrics_block *tcp_get_metrics(struct sock *sk,
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struct dst_entry *dst,
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bool create)
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{
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struct tcp_metrics_block *tm;
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struct inetpeer_addr addr;
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unsigned int hash;
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struct net *net;
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bool reclaim;
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addr.family = sk->sk_family;
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switch (addr.family) {
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case AF_INET:
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addr.addr.a4 = inet_sk(sk)->inet_daddr;
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hash = (__force unsigned int) addr.addr.a4;
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break;
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case AF_INET6:
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*(struct in6_addr *)addr.addr.a6 = inet6_sk(sk)->daddr;
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hash = ipv6_addr_hash(&inet6_sk(sk)->daddr);
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break;
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default:
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return NULL;
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}
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net = dev_net(dst->dev);
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hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);
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tm = __tcp_get_metrics(&addr, net, hash);
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reclaim = false;
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if (tm == TCP_METRICS_RECLAIM_PTR) {
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reclaim = true;
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tm = NULL;
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}
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if (!tm && create)
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tm = tcpm_new(dst, &addr, hash, reclaim);
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else
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tcpm_check_stamp(tm, dst);
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return tm;
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}
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/* Save metrics learned by this TCP session. This function is called
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* only, when TCP finishes successfully i.e. when it enters TIME-WAIT
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* or goes from LAST-ACK to CLOSE.
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*/
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void tcp_update_metrics(struct sock *sk)
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{
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const struct inet_connection_sock *icsk = inet_csk(sk);
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struct dst_entry *dst = __sk_dst_get(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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struct tcp_metrics_block *tm;
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unsigned long rtt;
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u32 val;
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int m;
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if (sysctl_tcp_nometrics_save || !dst)
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return;
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if (dst->flags & DST_HOST)
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dst_confirm(dst);
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rcu_read_lock();
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if (icsk->icsk_backoff || !tp->srtt) {
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/* This session failed to estimate rtt. Why?
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* Probably, no packets returned in time. Reset our
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* results.
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*/
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tm = tcp_get_metrics(sk, dst, false);
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if (tm && !tcp_metric_locked(tm, TCP_METRIC_RTT))
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tcp_metric_set(tm, TCP_METRIC_RTT, 0);
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goto out_unlock;
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} else
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tm = tcp_get_metrics(sk, dst, true);
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if (!tm)
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goto out_unlock;
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rtt = tcp_metric_get_jiffies(tm, TCP_METRIC_RTT);
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m = rtt - tp->srtt;
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/* If newly calculated rtt larger than stored one, store new
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* one. Otherwise, use EWMA. Remember, rtt overestimation is
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* always better than underestimation.
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*/
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if (!tcp_metric_locked(tm, TCP_METRIC_RTT)) {
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if (m <= 0)
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rtt = tp->srtt;
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else
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rtt -= (m >> 3);
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tcp_metric_set_msecs(tm, TCP_METRIC_RTT, rtt);
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}
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if (!tcp_metric_locked(tm, TCP_METRIC_RTTVAR)) {
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unsigned long var;
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if (m < 0)
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m = -m;
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/* Scale deviation to rttvar fixed point */
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m >>= 1;
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if (m < tp->mdev)
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m = tp->mdev;
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var = tcp_metric_get_jiffies(tm, TCP_METRIC_RTTVAR);
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if (m >= var)
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var = m;
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else
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var -= (var - m) >> 2;
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tcp_metric_set_msecs(tm, TCP_METRIC_RTTVAR, var);
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}
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if (tcp_in_initial_slowstart(tp)) {
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/* Slow start still did not finish. */
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if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
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val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
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if (val && (tp->snd_cwnd >> 1) > val)
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tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
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tp->snd_cwnd >> 1);
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}
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if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
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val = tcp_metric_get(tm, TCP_METRIC_CWND);
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if (tp->snd_cwnd > val)
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tcp_metric_set(tm, TCP_METRIC_CWND,
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tp->snd_cwnd);
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}
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} else if (tp->snd_cwnd > tp->snd_ssthresh &&
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icsk->icsk_ca_state == TCP_CA_Open) {
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/* Cong. avoidance phase, cwnd is reliable. */
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if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH))
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tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
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max(tp->snd_cwnd >> 1, tp->snd_ssthresh));
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if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
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val = tcp_metric_get(tm, TCP_METRIC_CWND);
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tcp_metric_set(tm, TCP_METRIC_CWND, (val + tp->snd_cwnd) >> 1);
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}
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} else {
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/* Else slow start did not finish, cwnd is non-sense,
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* ssthresh may be also invalid.
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*/
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if (!tcp_metric_locked(tm, TCP_METRIC_CWND)) {
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val = tcp_metric_get(tm, TCP_METRIC_CWND);
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tcp_metric_set(tm, TCP_METRIC_CWND,
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(val + tp->snd_ssthresh) >> 1);
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}
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if (!tcp_metric_locked(tm, TCP_METRIC_SSTHRESH)) {
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val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
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if (val && tp->snd_ssthresh > val)
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tcp_metric_set(tm, TCP_METRIC_SSTHRESH,
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tp->snd_ssthresh);
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}
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if (!tcp_metric_locked(tm, TCP_METRIC_REORDERING)) {
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val = tcp_metric_get(tm, TCP_METRIC_REORDERING);
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if (val < tp->reordering &&
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tp->reordering != sysctl_tcp_reordering)
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tcp_metric_set(tm, TCP_METRIC_REORDERING,
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tp->reordering);
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}
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}
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tm->tcpm_stamp = jiffies;
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out_unlock:
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rcu_read_unlock();
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}
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/* Initialize metrics on socket. */
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void tcp_init_metrics(struct sock *sk)
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{
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struct dst_entry *dst = __sk_dst_get(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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struct tcp_metrics_block *tm;
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u32 val;
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if (dst == NULL)
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goto reset;
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dst_confirm(dst);
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rcu_read_lock();
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tm = tcp_get_metrics(sk, dst, true);
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if (!tm) {
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rcu_read_unlock();
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goto reset;
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}
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if (tcp_metric_locked(tm, TCP_METRIC_CWND))
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tp->snd_cwnd_clamp = tcp_metric_get(tm, TCP_METRIC_CWND);
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val = tcp_metric_get(tm, TCP_METRIC_SSTHRESH);
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if (val) {
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tp->snd_ssthresh = val;
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if (tp->snd_ssthresh > tp->snd_cwnd_clamp)
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tp->snd_ssthresh = tp->snd_cwnd_clamp;
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} else {
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/* ssthresh may have been reduced unnecessarily during.
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* 3WHS. Restore it back to its initial default.
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*/
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tp->snd_ssthresh = TCP_INFINITE_SSTHRESH;
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}
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val = tcp_metric_get(tm, TCP_METRIC_REORDERING);
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if (val && tp->reordering != val) {
|
|
tcp_disable_fack(tp);
|
|
tcp_disable_early_retrans(tp);
|
|
tp->reordering = val;
|
|
}
|
|
|
|
val = tcp_metric_get(tm, TCP_METRIC_RTT);
|
|
if (val == 0 || tp->srtt == 0) {
|
|
rcu_read_unlock();
|
|
goto reset;
|
|
}
|
|
/* Initial rtt is determined from SYN,SYN-ACK.
|
|
* The segment is small and rtt may appear much
|
|
* less than real one. Use per-dst memory
|
|
* to make it more realistic.
|
|
*
|
|
* A bit of theory. RTT is time passed after "normal" sized packet
|
|
* is sent until it is ACKed. In normal circumstances sending small
|
|
* packets force peer to delay ACKs and calculation is correct too.
|
|
* The algorithm is adaptive and, provided we follow specs, it
|
|
* NEVER underestimate RTT. BUT! If peer tries to make some clever
|
|
* tricks sort of "quick acks" for time long enough to decrease RTT
|
|
* to low value, and then abruptly stops to do it and starts to delay
|
|
* ACKs, wait for troubles.
|
|
*/
|
|
val = msecs_to_jiffies(val);
|
|
if (val > tp->srtt) {
|
|
tp->srtt = val;
|
|
tp->rtt_seq = tp->snd_nxt;
|
|
}
|
|
val = tcp_metric_get_jiffies(tm, TCP_METRIC_RTTVAR);
|
|
if (val > tp->mdev) {
|
|
tp->mdev = val;
|
|
tp->mdev_max = tp->rttvar = max(tp->mdev, tcp_rto_min(sk));
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
tcp_set_rto(sk);
|
|
reset:
|
|
if (tp->srtt == 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;
|
|
inet_csk(sk)->icsk_rto = TCP_TIMEOUT_FALLBACK;
|
|
}
|
|
/* Cut cwnd down to 1 per RFC5681 if SYN or SYN-ACK has been
|
|
* retransmitted. In light of RFC6298 more aggressive 1sec
|
|
* initRTO, we only reset cwnd when more than 1 SYN/SYN-ACK
|
|
* retransmission has occurred.
|
|
*/
|
|
if (tp->total_retrans > 1)
|
|
tp->snd_cwnd = 1;
|
|
else
|
|
tp->snd_cwnd = tcp_init_cwnd(tp, dst);
|
|
tp->snd_cwnd_stamp = tcp_time_stamp;
|
|
}
|
|
|
|
bool tcp_peer_is_proven(struct request_sock *req, struct dst_entry *dst, bool paws_check)
|
|
{
|
|
struct tcp_metrics_block *tm;
|
|
bool ret;
|
|
|
|
if (!dst)
|
|
return false;
|
|
|
|
rcu_read_lock();
|
|
tm = __tcp_get_metrics_req(req, dst);
|
|
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 (tm) {
|
|
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 DEFINE_SEQLOCK(fastopen_seqlock);
|
|
|
|
void tcp_fastopen_cache_get(struct sock *sk, u16 *mss,
|
|
struct tcp_fastopen_cookie *cookie,
|
|
int *syn_loss, unsigned long *last_syn_loss)
|
|
{
|
|
struct tcp_metrics_block *tm;
|
|
|
|
rcu_read_lock();
|
|
tm = tcp_get_metrics(sk, __sk_dst_get(sk), false);
|
|
if (tm) {
|
|
struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen;
|
|
unsigned int seq;
|
|
|
|
do {
|
|
seq = read_seqbegin(&fastopen_seqlock);
|
|
if (tfom->mss)
|
|
*mss = tfom->mss;
|
|
*cookie = tfom->cookie;
|
|
*syn_loss = tfom->syn_loss;
|
|
*last_syn_loss = *syn_loss ? tfom->last_syn_loss : 0;
|
|
} while (read_seqretry(&fastopen_seqlock, seq));
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
void tcp_fastopen_cache_set(struct sock *sk, u16 mss,
|
|
struct tcp_fastopen_cookie *cookie, bool syn_lost)
|
|
{
|
|
struct tcp_metrics_block *tm;
|
|
|
|
rcu_read_lock();
|
|
tm = tcp_get_metrics(sk, __sk_dst_get(sk), true);
|
|
if (tm) {
|
|
struct tcp_fastopen_metrics *tfom = &tm->tcpm_fastopen;
|
|
|
|
write_seqlock_bh(&fastopen_seqlock);
|
|
tfom->mss = mss;
|
|
if (cookie->len > 0)
|
|
tfom->cookie = *cookie;
|
|
if (syn_lost) {
|
|
++tfom->syn_loss;
|
|
tfom->last_syn_loss = jiffies;
|
|
} else
|
|
tfom->syn_loss = 0;
|
|
write_sequnlock_bh(&fastopen_seqlock);
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static struct genl_family tcp_metrics_nl_family = {
|
|
.id = GENL_ID_GENERATE,
|
|
.hdrsize = 0,
|
|
.name = TCP_METRICS_GENL_NAME,
|
|
.version = TCP_METRICS_GENL_VERSION,
|
|
.maxattr = TCP_METRICS_ATTR_MAX,
|
|
.netnsok = true,
|
|
};
|
|
|
|
static struct nla_policy tcp_metrics_nl_policy[TCP_METRICS_ATTR_MAX + 1] = {
|
|
[TCP_METRICS_ATTR_ADDR_IPV4] = { .type = NLA_U32, },
|
|
[TCP_METRICS_ATTR_ADDR_IPV6] = { .type = NLA_BINARY,
|
|
.len = sizeof(struct in6_addr), },
|
|
/* Following attributes are not received for GET/DEL,
|
|
* we keep them for reference
|
|
*/
|
|
#if 0
|
|
[TCP_METRICS_ATTR_AGE] = { .type = NLA_MSECS, },
|
|
[TCP_METRICS_ATTR_TW_TSVAL] = { .type = NLA_U32, },
|
|
[TCP_METRICS_ATTR_TW_TS_STAMP] = { .type = NLA_S32, },
|
|
[TCP_METRICS_ATTR_VALS] = { .type = NLA_NESTED, },
|
|
[TCP_METRICS_ATTR_FOPEN_MSS] = { .type = NLA_U16, },
|
|
[TCP_METRICS_ATTR_FOPEN_SYN_DROPS] = { .type = NLA_U16, },
|
|
[TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS] = { .type = NLA_MSECS, },
|
|
[TCP_METRICS_ATTR_FOPEN_COOKIE] = { .type = NLA_BINARY,
|
|
.len = TCP_FASTOPEN_COOKIE_MAX, },
|
|
#endif
|
|
};
|
|
|
|
/* Add attributes, caller cancels its header on failure */
|
|
static int tcp_metrics_fill_info(struct sk_buff *msg,
|
|
struct tcp_metrics_block *tm)
|
|
{
|
|
struct nlattr *nest;
|
|
int i;
|
|
|
|
switch (tm->tcpm_addr.family) {
|
|
case AF_INET:
|
|
if (nla_put_be32(msg, TCP_METRICS_ATTR_ADDR_IPV4,
|
|
tm->tcpm_addr.addr.a4) < 0)
|
|
goto nla_put_failure;
|
|
break;
|
|
case AF_INET6:
|
|
if (nla_put(msg, TCP_METRICS_ATTR_ADDR_IPV6, 16,
|
|
tm->tcpm_addr.addr.a6) < 0)
|
|
goto nla_put_failure;
|
|
break;
|
|
default:
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
if (nla_put_msecs(msg, TCP_METRICS_ATTR_AGE,
|
|
jiffies - tm->tcpm_stamp) < 0)
|
|
goto nla_put_failure;
|
|
if (tm->tcpm_ts_stamp) {
|
|
if (nla_put_s32(msg, TCP_METRICS_ATTR_TW_TS_STAMP,
|
|
(s32) (get_seconds() - tm->tcpm_ts_stamp)) < 0)
|
|
goto nla_put_failure;
|
|
if (nla_put_u32(msg, TCP_METRICS_ATTR_TW_TSVAL,
|
|
tm->tcpm_ts) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
{
|
|
int n = 0;
|
|
|
|
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])
|
|
continue;
|
|
if (nla_put_u32(msg, i + 1, tm->tcpm_vals[i]) < 0)
|
|
goto nla_put_failure;
|
|
n++;
|
|
}
|
|
if (n)
|
|
nla_nest_end(msg, nest);
|
|
else
|
|
nla_nest_cancel(msg, nest);
|
|
}
|
|
|
|
{
|
|
struct tcp_fastopen_metrics tfom_copy[1], *tfom;
|
|
unsigned int seq;
|
|
|
|
do {
|
|
seq = read_seqbegin(&fastopen_seqlock);
|
|
tfom_copy[0] = tm->tcpm_fastopen;
|
|
} while (read_seqretry(&fastopen_seqlock, seq));
|
|
|
|
tfom = tfom_copy;
|
|
if (tfom->mss &&
|
|
nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_MSS,
|
|
tfom->mss) < 0)
|
|
goto nla_put_failure;
|
|
if (tfom->syn_loss &&
|
|
(nla_put_u16(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROPS,
|
|
tfom->syn_loss) < 0 ||
|
|
nla_put_msecs(msg, TCP_METRICS_ATTR_FOPEN_SYN_DROP_TS,
|
|
jiffies - tfom->last_syn_loss) < 0))
|
|
goto nla_put_failure;
|
|
if (tfom->cookie.len > 0 &&
|
|
nla_put(msg, TCP_METRICS_ATTR_FOPEN_COOKIE,
|
|
tfom->cookie.len, tfom->cookie.val) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int tcp_metrics_dump_info(struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct tcp_metrics_block *tm)
|
|
{
|
|
void *hdr;
|
|
|
|
hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
|
|
&tcp_metrics_nl_family, NLM_F_MULTI,
|
|
TCP_METRICS_CMD_GET);
|
|
if (!hdr)
|
|
return -EMSGSIZE;
|
|
|
|
if (tcp_metrics_fill_info(skb, tm) < 0)
|
|
goto nla_put_failure;
|
|
|
|
return genlmsg_end(skb, hdr);
|
|
|
|
nla_put_failure:
|
|
genlmsg_cancel(skb, hdr);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int tcp_metrics_nl_dump(struct sk_buff *skb,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
unsigned int max_rows = 1U << net->ipv4.tcp_metrics_hash_log;
|
|
unsigned int row, s_row = cb->args[0];
|
|
int s_col = cb->args[1], col = s_col;
|
|
|
|
for (row = s_row; row < max_rows; row++, s_col = 0) {
|
|
struct tcp_metrics_block *tm;
|
|
struct tcpm_hash_bucket *hb = net->ipv4.tcp_metrics_hash + row;
|
|
|
|
rcu_read_lock();
|
|
for (col = 0, tm = rcu_dereference(hb->chain); tm;
|
|
tm = rcu_dereference(tm->tcpm_next), col++) {
|
|
if (col < s_col)
|
|
continue;
|
|
if (tcp_metrics_dump_info(skb, cb, tm) < 0) {
|
|
rcu_read_unlock();
|
|
goto done;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
done:
|
|
cb->args[0] = row;
|
|
cb->args[1] = col;
|
|
return skb->len;
|
|
}
|
|
|
|
static int parse_nl_addr(struct genl_info *info, struct inetpeer_addr *addr,
|
|
unsigned int *hash, int optional)
|
|
{
|
|
struct nlattr *a;
|
|
|
|
a = info->attrs[TCP_METRICS_ATTR_ADDR_IPV4];
|
|
if (a) {
|
|
addr->family = AF_INET;
|
|
addr->addr.a4 = nla_get_be32(a);
|
|
*hash = (__force unsigned int) addr->addr.a4;
|
|
return 0;
|
|
}
|
|
a = info->attrs[TCP_METRICS_ATTR_ADDR_IPV6];
|
|
if (a) {
|
|
if (nla_len(a) != sizeof(struct in6_addr))
|
|
return -EINVAL;
|
|
addr->family = AF_INET6;
|
|
memcpy(addr->addr.a6, nla_data(a), sizeof(addr->addr.a6));
|
|
*hash = ipv6_addr_hash((struct in6_addr *) addr->addr.a6);
|
|
return 0;
|
|
}
|
|
return optional ? 1 : -EAFNOSUPPORT;
|
|
}
|
|
|
|
static int tcp_metrics_nl_cmd_get(struct sk_buff *skb, struct genl_info *info)
|
|
{
|
|
struct tcp_metrics_block *tm;
|
|
struct inetpeer_addr addr;
|
|
unsigned int hash;
|
|
struct sk_buff *msg;
|
|
struct net *net = genl_info_net(info);
|
|
void *reply;
|
|
int ret;
|
|
|
|
ret = parse_nl_addr(info, &addr, &hash, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
|
|
if (!msg)
|
|
return -ENOMEM;
|
|
|
|
reply = genlmsg_put_reply(msg, info, &tcp_metrics_nl_family, 0,
|
|
info->genlhdr->cmd);
|
|
if (!reply)
|
|
goto nla_put_failure;
|
|
|
|
hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);
|
|
ret = -ESRCH;
|
|
rcu_read_lock();
|
|
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)) {
|
|
ret = tcp_metrics_fill_info(msg, tm);
|
|
break;
|
|
}
|
|
}
|
|
rcu_read_unlock();
|
|
if (ret < 0)
|
|
goto out_free;
|
|
|
|
genlmsg_end(msg, reply);
|
|
return genlmsg_reply(msg, info);
|
|
|
|
nla_put_failure:
|
|
ret = -EMSGSIZE;
|
|
|
|
out_free:
|
|
nlmsg_free(msg);
|
|
return ret;
|
|
}
|
|
|
|
#define deref_locked_genl(p) \
|
|
rcu_dereference_protected(p, lockdep_genl_is_held() && \
|
|
lockdep_is_held(&tcp_metrics_lock))
|
|
|
|
#define deref_genl(p) rcu_dereference_protected(p, lockdep_genl_is_held())
|
|
|
|
static int tcp_metrics_flush_all(struct net *net)
|
|
{
|
|
unsigned int max_rows = 1U << net->ipv4.tcp_metrics_hash_log;
|
|
struct tcpm_hash_bucket *hb = net->ipv4.tcp_metrics_hash;
|
|
struct tcp_metrics_block *tm;
|
|
unsigned int row;
|
|
|
|
for (row = 0; row < max_rows; row++, hb++) {
|
|
spin_lock_bh(&tcp_metrics_lock);
|
|
tm = deref_locked_genl(hb->chain);
|
|
if (tm)
|
|
hb->chain = NULL;
|
|
spin_unlock_bh(&tcp_metrics_lock);
|
|
while (tm) {
|
|
struct tcp_metrics_block *next;
|
|
|
|
next = deref_genl(tm->tcpm_next);
|
|
kfree_rcu(tm, rcu_head);
|
|
tm = next;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
struct tcp_metrics_block __rcu **pp;
|
|
struct inetpeer_addr addr;
|
|
unsigned int hash;
|
|
struct net *net = genl_info_net(info);
|
|
int ret;
|
|
|
|
ret = parse_nl_addr(info, &addr, &hash, 1);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret > 0)
|
|
return tcp_metrics_flush_all(net);
|
|
|
|
hash = hash_32(hash, net->ipv4.tcp_metrics_hash_log);
|
|
hb = net->ipv4.tcp_metrics_hash + hash;
|
|
pp = &hb->chain;
|
|
spin_lock_bh(&tcp_metrics_lock);
|
|
for (tm = deref_locked_genl(*pp); tm;
|
|
pp = &tm->tcpm_next, tm = deref_locked_genl(*pp)) {
|
|
if (addr_same(&tm->tcpm_addr, &addr)) {
|
|
*pp = tm->tcpm_next;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_bh(&tcp_metrics_lock);
|
|
if (!tm)
|
|
return -ESRCH;
|
|
kfree_rcu(tm, rcu_head);
|
|
return 0;
|
|
}
|
|
|
|
static struct genl_ops tcp_metrics_nl_ops[] = {
|
|
{
|
|
.cmd = TCP_METRICS_CMD_GET,
|
|
.doit = tcp_metrics_nl_cmd_get,
|
|
.dumpit = tcp_metrics_nl_dump,
|
|
.policy = tcp_metrics_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
{
|
|
.cmd = TCP_METRICS_CMD_DEL,
|
|
.doit = tcp_metrics_nl_cmd_del,
|
|
.policy = tcp_metrics_nl_policy,
|
|
.flags = GENL_ADMIN_PERM,
|
|
},
|
|
};
|
|
|
|
static unsigned int tcpmhash_entries;
|
|
static int __init set_tcpmhash_entries(char *str)
|
|
{
|
|
ssize_t ret;
|
|
|
|
if (!str)
|
|
return 0;
|
|
|
|
ret = kstrtouint(str, 0, &tcpmhash_entries);
|
|
if (ret)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
__setup("tcpmhash_entries=", set_tcpmhash_entries);
|
|
|
|
static int __net_init tcp_net_metrics_init(struct net *net)
|
|
{
|
|
size_t size;
|
|
unsigned int slots;
|
|
|
|
slots = tcpmhash_entries;
|
|
if (!slots) {
|
|
if (totalram_pages >= 128 * 1024)
|
|
slots = 16 * 1024;
|
|
else
|
|
slots = 8 * 1024;
|
|
}
|
|
|
|
net->ipv4.tcp_metrics_hash_log = order_base_2(slots);
|
|
size = sizeof(struct tcpm_hash_bucket) << net->ipv4.tcp_metrics_hash_log;
|
|
|
|
net->ipv4.tcp_metrics_hash = kzalloc(size, GFP_KERNEL);
|
|
if (!net->ipv4.tcp_metrics_hash)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit tcp_net_metrics_exit(struct net *net)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < (1U << net->ipv4.tcp_metrics_hash_log) ; i++) {
|
|
struct tcp_metrics_block *tm, *next;
|
|
|
|
tm = rcu_dereference_protected(net->ipv4.tcp_metrics_hash[i].chain, 1);
|
|
while (tm) {
|
|
next = rcu_dereference_protected(tm->tcpm_next, 1);
|
|
kfree(tm);
|
|
tm = next;
|
|
}
|
|
}
|
|
kfree(net->ipv4.tcp_metrics_hash);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations tcp_net_metrics_ops = {
|
|
.init = tcp_net_metrics_init,
|
|
.exit = tcp_net_metrics_exit,
|
|
};
|
|
|
|
void __init tcp_metrics_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&tcp_net_metrics_ops);
|
|
if (ret < 0)
|
|
goto cleanup;
|
|
ret = genl_register_family_with_ops(&tcp_metrics_nl_family,
|
|
tcp_metrics_nl_ops,
|
|
ARRAY_SIZE(tcp_metrics_nl_ops));
|
|
if (ret < 0)
|
|
goto cleanup_subsys;
|
|
return;
|
|
|
|
cleanup_subsys:
|
|
unregister_pernet_subsys(&tcp_net_metrics_ops);
|
|
|
|
cleanup:
|
|
return;
|
|
}
|