udp: no longer use SLAB_DESTROY_BY_RCU
Tom Herbert would like not touching UDP socket refcnt for encapsulated traffic. For this to happen, we need to use normal RCU rules, with a grace period before freeing a socket. UDP sockets are not short lived in the high usage case, so the added cost of call_rcu() should not be a concern. This actually removes a lot of complexity in UDP stack. Multicast receives no longer need to hold a bucket spinlock. Note that ip early demux still needs to take a reference on the socket. Same remark for functions used by xt_socket and xt_PROXY netfilter modules, but this might be changed later. Performance for a single UDP socket receiving flood traffic from many RX queues/cpus. Simple udp_rx using simple recvfrom() loop : 438 kpps instead of 374 kpps : 17 % increase of the peak rate. v2: Addressed Willem de Bruijn feedback in multicast handling - keep early demux break in __udp4_lib_demux_lookup() Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <tom@herbertland.com> Cc: Willem de Bruijn <willemb@google.com> Tested-by: Tom Herbert <tom@herbertland.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Родитель
a4298e4522
Коммит
ca065d0cf8
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@ -98,11 +98,11 @@ static inline bool udp_get_no_check6_rx(struct sock *sk)
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return udp_sk(sk)->no_check6_rx;
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}
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#define udp_portaddr_for_each_entry(__sk, node, list) \
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hlist_nulls_for_each_entry(__sk, node, list, __sk_common.skc_portaddr_node)
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#define udp_portaddr_for_each_entry(__sk, list) \
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hlist_for_each_entry(__sk, list, __sk_common.skc_portaddr_node)
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#define udp_portaddr_for_each_entry_rcu(__sk, node, list) \
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hlist_nulls_for_each_entry_rcu(__sk, node, list, __sk_common.skc_portaddr_node)
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#define udp_portaddr_for_each_entry_rcu(__sk, list) \
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hlist_for_each_entry_rcu(__sk, list, __sk_common.skc_portaddr_node)
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#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
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@ -178,7 +178,7 @@ struct sock_common {
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int skc_bound_dev_if;
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union {
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struct hlist_node skc_bind_node;
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struct hlist_nulls_node skc_portaddr_node;
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struct hlist_node skc_portaddr_node;
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};
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struct proto *skc_prot;
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possible_net_t skc_net;
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@ -670,18 +670,18 @@ static inline void sk_add_bind_node(struct sock *sk,
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hlist_for_each_entry(__sk, list, sk_bind_node)
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/**
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* sk_nulls_for_each_entry_offset - iterate over a list at a given struct offset
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* sk_for_each_entry_offset_rcu - iterate over a list at a given struct offset
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* @tpos: the type * to use as a loop cursor.
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* @pos: the &struct hlist_node to use as a loop cursor.
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* @head: the head for your list.
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* @offset: offset of hlist_node within the struct.
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*
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*/
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#define sk_nulls_for_each_entry_offset(tpos, pos, head, offset) \
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for (pos = (head)->first; \
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(!is_a_nulls(pos)) && \
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#define sk_for_each_entry_offset_rcu(tpos, pos, head, offset) \
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for (pos = rcu_dereference((head)->first); \
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pos != NULL && \
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({ tpos = (typeof(*tpos) *)((void *)pos - offset); 1;}); \
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pos = pos->next)
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pos = rcu_dereference(pos->next))
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static inline struct user_namespace *sk_user_ns(struct sock *sk)
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{
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@ -59,7 +59,7 @@ struct udp_skb_cb {
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* @lock: spinlock protecting changes to head/count
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*/
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struct udp_hslot {
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struct hlist_nulls_head head;
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struct hlist_head head;
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int count;
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spinlock_t lock;
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} __attribute__((aligned(2 * sizeof(long))));
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293
net/ipv4/udp.c
293
net/ipv4/udp.c
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@ -143,10 +143,9 @@ static int udp_lib_lport_inuse(struct net *net, __u16 num,
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unsigned int log)
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{
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struct sock *sk2;
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struct hlist_nulls_node *node;
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kuid_t uid = sock_i_uid(sk);
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sk_nulls_for_each(sk2, node, &hslot->head) {
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sk_for_each(sk2, &hslot->head) {
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if (net_eq(sock_net(sk2), net) &&
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sk2 != sk &&
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(bitmap || udp_sk(sk2)->udp_port_hash == num) &&
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@ -177,12 +176,11 @@ static int udp_lib_lport_inuse2(struct net *net, __u16 num,
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bool match_wildcard))
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{
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struct sock *sk2;
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struct hlist_nulls_node *node;
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kuid_t uid = sock_i_uid(sk);
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int res = 0;
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spin_lock(&hslot2->lock);
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udp_portaddr_for_each_entry(sk2, node, &hslot2->head) {
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udp_portaddr_for_each_entry(sk2, &hslot2->head) {
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if (net_eq(sock_net(sk2), net) &&
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sk2 != sk &&
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(udp_sk(sk2)->udp_port_hash == num) &&
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@ -207,11 +205,10 @@ static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot,
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bool match_wildcard))
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{
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struct net *net = sock_net(sk);
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struct hlist_nulls_node *node;
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kuid_t uid = sock_i_uid(sk);
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struct sock *sk2;
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sk_nulls_for_each(sk2, node, &hslot->head) {
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sk_for_each(sk2, &hslot->head) {
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if (net_eq(sock_net(sk2), net) &&
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sk2 != sk &&
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sk2->sk_family == sk->sk_family &&
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@ -333,17 +330,18 @@ found:
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goto fail_unlock;
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}
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sk_nulls_add_node_rcu(sk, &hslot->head);
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sk_add_node_rcu(sk, &hslot->head);
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hslot->count++;
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
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spin_lock(&hslot2->lock);
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hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
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hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
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&hslot2->head);
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hslot2->count++;
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spin_unlock(&hslot2->lock);
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}
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sock_set_flag(sk, SOCK_RCU_FREE);
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error = 0;
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fail_unlock:
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spin_unlock_bh(&hslot->lock);
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@ -497,37 +495,27 @@ static struct sock *udp4_lib_lookup2(struct net *net,
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struct sk_buff *skb)
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{
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struct sock *sk, *result;
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struct hlist_nulls_node *node;
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int score, badness, matches = 0, reuseport = 0;
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bool select_ok = true;
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u32 hash = 0;
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begin:
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result = NULL;
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badness = 0;
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udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
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udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
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score = compute_score2(sk, net, saddr, sport,
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daddr, hnum, dif);
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if (score > badness) {
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result = sk;
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badness = score;
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reuseport = sk->sk_reuseport;
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if (reuseport) {
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hash = udp_ehashfn(net, daddr, hnum,
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saddr, sport);
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if (select_ok) {
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struct sock *sk2;
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sk2 = reuseport_select_sock(sk, hash, skb,
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result = reuseport_select_sock(sk, hash, skb,
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sizeof(struct udphdr));
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if (sk2) {
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result = sk2;
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select_ok = false;
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goto found;
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}
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}
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if (result)
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return result;
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matches = 1;
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}
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badness = score;
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result = sk;
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} else if (score == badness && reuseport) {
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matches++;
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if (reciprocal_scale(hash, matches) == 0)
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@ -535,23 +523,6 @@ begin:
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hash = next_pseudo_random32(hash);
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}
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}
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/*
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* if the nulls value we got at the end of this lookup is
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* not the expected one, we must restart lookup.
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* We probably met an item that was moved to another chain.
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*/
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if (get_nulls_value(node) != slot2)
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goto begin;
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if (result) {
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found:
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if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
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result = NULL;
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else if (unlikely(compute_score2(result, net, saddr, sport,
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daddr, hnum, dif) < badness)) {
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sock_put(result);
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goto begin;
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}
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}
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return result;
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}
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@ -563,15 +534,12 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
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int dif, struct udp_table *udptable, struct sk_buff *skb)
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{
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struct sock *sk, *result;
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struct hlist_nulls_node *node;
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unsigned short hnum = ntohs(dport);
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unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
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struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
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int score, badness, matches = 0, reuseport = 0;
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bool select_ok = true;
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u32 hash = 0;
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rcu_read_lock();
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if (hslot->count > 10) {
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hash2 = udp4_portaddr_hash(net, daddr, hnum);
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slot2 = hash2 & udptable->mask;
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@ -593,35 +561,27 @@ struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
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htonl(INADDR_ANY), hnum, dif,
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hslot2, slot2, skb);
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}
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rcu_read_unlock();
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return result;
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}
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begin:
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result = NULL;
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badness = 0;
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sk_nulls_for_each_rcu(sk, node, &hslot->head) {
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sk_for_each_rcu(sk, &hslot->head) {
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score = compute_score(sk, net, saddr, hnum, sport,
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daddr, dport, dif);
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if (score > badness) {
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result = sk;
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badness = score;
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reuseport = sk->sk_reuseport;
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if (reuseport) {
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hash = udp_ehashfn(net, daddr, hnum,
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saddr, sport);
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if (select_ok) {
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struct sock *sk2;
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sk2 = reuseport_select_sock(sk, hash, skb,
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result = reuseport_select_sock(sk, hash, skb,
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sizeof(struct udphdr));
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if (sk2) {
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result = sk2;
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select_ok = false;
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goto found;
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}
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}
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if (result)
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return result;
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matches = 1;
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}
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result = sk;
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badness = score;
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} else if (score == badness && reuseport) {
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matches++;
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if (reciprocal_scale(hash, matches) == 0)
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@ -629,25 +589,6 @@ begin:
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hash = next_pseudo_random32(hash);
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}
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}
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/*
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* if the nulls value we got at the end of this lookup is
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* not the expected one, we must restart lookup.
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* We probably met an item that was moved to another chain.
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*/
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if (get_nulls_value(node) != slot)
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goto begin;
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if (result) {
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found:
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if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
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result = NULL;
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else if (unlikely(compute_score(result, net, saddr, hnum, sport,
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daddr, dport, dif) < badness)) {
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sock_put(result);
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goto begin;
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}
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}
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rcu_read_unlock();
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return result;
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}
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EXPORT_SYMBOL_GPL(__udp4_lib_lookup);
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@ -663,13 +604,24 @@ static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
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udptable, skb);
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}
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/* Must be called under rcu_read_lock().
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* Does increment socket refcount.
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*/
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#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
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IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
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struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
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__be32 daddr, __be16 dport, int dif)
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{
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return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif,
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&udp_table, NULL);
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struct sock *sk;
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sk = __udp4_lib_lookup(net, saddr, sport, daddr, dport,
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dif, &udp_table, NULL);
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if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
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sk = NULL;
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return sk;
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}
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EXPORT_SYMBOL_GPL(udp4_lib_lookup);
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#endif
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static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk,
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__be16 loc_port, __be32 loc_addr,
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|
@ -771,7 +723,7 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
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sk->sk_err = err;
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sk->sk_error_report(sk);
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out:
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sock_put(sk);
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return;
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}
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void udp_err(struct sk_buff *skb, u32 info)
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|
@ -1474,13 +1426,13 @@ void udp_lib_unhash(struct sock *sk)
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spin_lock_bh(&hslot->lock);
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if (rcu_access_pointer(sk->sk_reuseport_cb))
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reuseport_detach_sock(sk);
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if (sk_nulls_del_node_init_rcu(sk)) {
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if (sk_del_node_init_rcu(sk)) {
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hslot->count--;
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inet_sk(sk)->inet_num = 0;
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
|
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|
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spin_lock(&hslot2->lock);
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hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
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hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
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hslot2->count--;
|
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spin_unlock(&hslot2->lock);
|
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}
|
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|
@ -1513,12 +1465,12 @@ void udp_lib_rehash(struct sock *sk, u16 newhash)
|
|||
|
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if (hslot2 != nhslot2) {
|
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spin_lock(&hslot2->lock);
|
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hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
|
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hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
|
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hslot2->count--;
|
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spin_unlock(&hslot2->lock);
|
||||
|
||||
spin_lock(&nhslot2->lock);
|
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hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
|
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hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
|
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&nhslot2->head);
|
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nhslot2->count++;
|
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spin_unlock(&nhslot2->lock);
|
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|
@ -1697,35 +1649,6 @@ drop:
|
|||
return -1;
|
||||
}
|
||||
|
||||
static void flush_stack(struct sock **stack, unsigned int count,
|
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struct sk_buff *skb, unsigned int final)
|
||||
{
|
||||
unsigned int i;
|
||||
struct sk_buff *skb1 = NULL;
|
||||
struct sock *sk;
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
sk = stack[i];
|
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if (likely(!skb1))
|
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skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
|
||||
|
||||
if (!skb1) {
|
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atomic_inc(&sk->sk_drops);
|
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UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
|
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IS_UDPLITE(sk));
|
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UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
}
|
||||
|
||||
if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0)
|
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skb1 = NULL;
|
||||
|
||||
sock_put(sk);
|
||||
}
|
||||
if (unlikely(skb1))
|
||||
kfree_skb(skb1);
|
||||
}
|
||||
|
||||
/* For TCP sockets, sk_rx_dst is protected by socket lock
|
||||
* For UDP, we use xchg() to guard against concurrent changes.
|
||||
*/
|
||||
|
@ -1749,14 +1672,14 @@ static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
|
|||
struct udp_table *udptable,
|
||||
int proto)
|
||||
{
|
||||
struct sock *sk, *stack[256 / sizeof(struct sock *)];
|
||||
struct hlist_nulls_node *node;
|
||||
struct sock *sk, *first = NULL;
|
||||
unsigned short hnum = ntohs(uh->dest);
|
||||
struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
|
||||
int dif = skb->dev->ifindex;
|
||||
unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
|
||||
unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
|
||||
bool inner_flushed = false;
|
||||
unsigned int offset = offsetof(typeof(*sk), sk_node);
|
||||
int dif = skb->dev->ifindex;
|
||||
struct hlist_node *node;
|
||||
struct sk_buff *nskb;
|
||||
|
||||
if (use_hash2) {
|
||||
hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) &
|
||||
|
@ -1767,23 +1690,28 @@ start_lookup:
|
|||
offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
|
||||
}
|
||||
|
||||
spin_lock(&hslot->lock);
|
||||
sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
|
||||
if (__udp_is_mcast_sock(net, sk,
|
||||
uh->dest, daddr,
|
||||
uh->source, saddr,
|
||||
dif, hnum)) {
|
||||
if (unlikely(count == ARRAY_SIZE(stack))) {
|
||||
flush_stack(stack, count, skb, ~0);
|
||||
inner_flushed = true;
|
||||
count = 0;
|
||||
}
|
||||
stack[count++] = sk;
|
||||
sock_hold(sk);
|
||||
}
|
||||
}
|
||||
sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
|
||||
if (!__udp_is_mcast_sock(net, sk, uh->dest, daddr,
|
||||
uh->source, saddr, dif, hnum))
|
||||
continue;
|
||||
|
||||
spin_unlock(&hslot->lock);
|
||||
if (!first) {
|
||||
first = sk;
|
||||
continue;
|
||||
}
|
||||
nskb = skb_clone(skb, GFP_ATOMIC);
|
||||
|
||||
if (unlikely(!nskb)) {
|
||||
atomic_inc(&sk->sk_drops);
|
||||
UDP_INC_STATS_BH(net, UDP_MIB_RCVBUFERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
UDP_INC_STATS_BH(net, UDP_MIB_INERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
continue;
|
||||
}
|
||||
if (udp_queue_rcv_skb(sk, nskb) > 0)
|
||||
consume_skb(nskb);
|
||||
}
|
||||
|
||||
/* Also lookup *:port if we are using hash2 and haven't done so yet. */
|
||||
if (use_hash2 && hash2 != hash2_any) {
|
||||
|
@ -1791,16 +1719,13 @@ start_lookup:
|
|||
goto start_lookup;
|
||||
}
|
||||
|
||||
/*
|
||||
* do the slow work with no lock held
|
||||
*/
|
||||
if (count) {
|
||||
flush_stack(stack, count, skb, count - 1);
|
||||
if (first) {
|
||||
if (udp_queue_rcv_skb(first, skb) > 0)
|
||||
consume_skb(skb);
|
||||
} else {
|
||||
if (!inner_flushed)
|
||||
UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
|
||||
proto == IPPROTO_UDPLITE);
|
||||
consume_skb(skb);
|
||||
kfree_skb(skb);
|
||||
UDP_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
|
||||
proto == IPPROTO_UDPLITE);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
@ -1897,7 +1822,6 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
|||
inet_compute_pseudo);
|
||||
|
||||
ret = udp_queue_rcv_skb(sk, skb);
|
||||
sock_put(sk);
|
||||
|
||||
/* a return value > 0 means to resubmit the input, but
|
||||
* it wants the return to be -protocol, or 0
|
||||
|
@ -1958,49 +1882,24 @@ static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net,
|
|||
int dif)
|
||||
{
|
||||
struct sock *sk, *result;
|
||||
struct hlist_nulls_node *node;
|
||||
unsigned short hnum = ntohs(loc_port);
|
||||
unsigned int count, slot = udp_hashfn(net, hnum, udp_table.mask);
|
||||
unsigned int slot = udp_hashfn(net, hnum, udp_table.mask);
|
||||
struct udp_hslot *hslot = &udp_table.hash[slot];
|
||||
|
||||
/* Do not bother scanning a too big list */
|
||||
if (hslot->count > 10)
|
||||
return NULL;
|
||||
|
||||
rcu_read_lock();
|
||||
begin:
|
||||
count = 0;
|
||||
result = NULL;
|
||||
sk_nulls_for_each_rcu(sk, node, &hslot->head) {
|
||||
if (__udp_is_mcast_sock(net, sk,
|
||||
loc_port, loc_addr,
|
||||
rmt_port, rmt_addr,
|
||||
dif, hnum)) {
|
||||
sk_for_each_rcu(sk, &hslot->head) {
|
||||
if (__udp_is_mcast_sock(net, sk, loc_port, loc_addr,
|
||||
rmt_port, rmt_addr, dif, hnum)) {
|
||||
if (result)
|
||||
return NULL;
|
||||
result = sk;
|
||||
++count;
|
||||
}
|
||||
}
|
||||
/*
|
||||
* if the nulls value we got at the end of this lookup is
|
||||
* not the expected one, we must restart lookup.
|
||||
* We probably met an item that was moved to another chain.
|
||||
*/
|
||||
if (get_nulls_value(node) != slot)
|
||||
goto begin;
|
||||
|
||||
if (result) {
|
||||
if (count != 1 ||
|
||||
unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
|
||||
result = NULL;
|
||||
else if (unlikely(!__udp_is_mcast_sock(net, result,
|
||||
loc_port, loc_addr,
|
||||
rmt_port, rmt_addr,
|
||||
dif, hnum))) {
|
||||
sock_put(result);
|
||||
result = NULL;
|
||||
}
|
||||
}
|
||||
rcu_read_unlock();
|
||||
return result;
|
||||
}
|
||||
|
||||
|
@ -2013,37 +1912,22 @@ static struct sock *__udp4_lib_demux_lookup(struct net *net,
|
|||
__be16 rmt_port, __be32 rmt_addr,
|
||||
int dif)
|
||||
{
|
||||
struct sock *sk, *result;
|
||||
struct hlist_nulls_node *node;
|
||||
unsigned short hnum = ntohs(loc_port);
|
||||
unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum);
|
||||
unsigned int slot2 = hash2 & udp_table.mask;
|
||||
struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
|
||||
INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr);
|
||||
const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
|
||||
struct sock *sk;
|
||||
|
||||
rcu_read_lock();
|
||||
result = NULL;
|
||||
udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
|
||||
if (INET_MATCH(sk, net, acookie,
|
||||
rmt_addr, loc_addr, ports, dif))
|
||||
result = sk;
|
||||
udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
|
||||
if (INET_MATCH(sk, net, acookie, rmt_addr,
|
||||
loc_addr, ports, dif))
|
||||
return sk;
|
||||
/* Only check first socket in chain */
|
||||
break;
|
||||
}
|
||||
|
||||
if (result) {
|
||||
if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
|
||||
result = NULL;
|
||||
else if (unlikely(!INET_MATCH(sk, net, acookie,
|
||||
rmt_addr, loc_addr,
|
||||
ports, dif))) {
|
||||
sock_put(result);
|
||||
result = NULL;
|
||||
}
|
||||
}
|
||||
rcu_read_unlock();
|
||||
return result;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
void udp_v4_early_demux(struct sk_buff *skb)
|
||||
|
@ -2051,7 +1935,7 @@ void udp_v4_early_demux(struct sk_buff *skb)
|
|||
struct net *net = dev_net(skb->dev);
|
||||
const struct iphdr *iph;
|
||||
const struct udphdr *uh;
|
||||
struct sock *sk;
|
||||
struct sock *sk = NULL;
|
||||
struct dst_entry *dst;
|
||||
int dif = skb->dev->ifindex;
|
||||
int ours;
|
||||
|
@ -2083,11 +1967,9 @@ void udp_v4_early_demux(struct sk_buff *skb)
|
|||
} else if (skb->pkt_type == PACKET_HOST) {
|
||||
sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr,
|
||||
uh->source, iph->saddr, dif);
|
||||
} else {
|
||||
return;
|
||||
}
|
||||
|
||||
if (!sk)
|
||||
if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2))
|
||||
return;
|
||||
|
||||
skb->sk = sk;
|
||||
|
@ -2387,14 +2269,13 @@ static struct sock *udp_get_first(struct seq_file *seq, int start)
|
|||
|
||||
for (state->bucket = start; state->bucket <= state->udp_table->mask;
|
||||
++state->bucket) {
|
||||
struct hlist_nulls_node *node;
|
||||
struct udp_hslot *hslot = &state->udp_table->hash[state->bucket];
|
||||
|
||||
if (hlist_nulls_empty(&hslot->head))
|
||||
if (hlist_empty(&hslot->head))
|
||||
continue;
|
||||
|
||||
spin_lock_bh(&hslot->lock);
|
||||
sk_nulls_for_each(sk, node, &hslot->head) {
|
||||
sk_for_each(sk, &hslot->head) {
|
||||
if (!net_eq(sock_net(sk), net))
|
||||
continue;
|
||||
if (sk->sk_family == state->family)
|
||||
|
@ -2413,7 +2294,7 @@ static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
|
|||
struct net *net = seq_file_net(seq);
|
||||
|
||||
do {
|
||||
sk = sk_nulls_next(sk);
|
||||
sk = sk_next(sk);
|
||||
} while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family));
|
||||
|
||||
if (!sk) {
|
||||
|
@ -2622,12 +2503,12 @@ void __init udp_table_init(struct udp_table *table, const char *name)
|
|||
|
||||
table->hash2 = table->hash + (table->mask + 1);
|
||||
for (i = 0; i <= table->mask; i++) {
|
||||
INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i);
|
||||
INIT_HLIST_HEAD(&table->hash[i].head);
|
||||
table->hash[i].count = 0;
|
||||
spin_lock_init(&table->hash[i].lock);
|
||||
}
|
||||
for (i = 0; i <= table->mask; i++) {
|
||||
INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i);
|
||||
INIT_HLIST_HEAD(&table->hash2[i].head);
|
||||
table->hash2[i].count = 0;
|
||||
spin_lock_init(&table->hash2[i].lock);
|
||||
}
|
||||
|
|
|
@ -36,10 +36,11 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
|
|||
const struct inet_diag_req_v2 *req)
|
||||
{
|
||||
int err = -EINVAL;
|
||||
struct sock *sk;
|
||||
struct sock *sk = NULL;
|
||||
struct sk_buff *rep;
|
||||
struct net *net = sock_net(in_skb->sk);
|
||||
|
||||
rcu_read_lock();
|
||||
if (req->sdiag_family == AF_INET)
|
||||
sk = __udp4_lib_lookup(net,
|
||||
req->id.idiag_src[0], req->id.idiag_sport,
|
||||
|
@ -54,9 +55,9 @@ static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
|
|||
req->id.idiag_dport,
|
||||
req->id.idiag_if, tbl, NULL);
|
||||
#endif
|
||||
else
|
||||
goto out_nosk;
|
||||
|
||||
if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
|
||||
sk = NULL;
|
||||
rcu_read_unlock();
|
||||
err = -ENOENT;
|
||||
if (!sk)
|
||||
goto out_nosk;
|
||||
|
@ -96,24 +97,23 @@ static void udp_dump(struct udp_table *table, struct sk_buff *skb,
|
|||
struct netlink_callback *cb,
|
||||
const struct inet_diag_req_v2 *r, struct nlattr *bc)
|
||||
{
|
||||
int num, s_num, slot, s_slot;
|
||||
struct net *net = sock_net(skb->sk);
|
||||
int num, s_num, slot, s_slot;
|
||||
|
||||
s_slot = cb->args[0];
|
||||
num = s_num = cb->args[1];
|
||||
|
||||
for (slot = s_slot; slot <= table->mask; s_num = 0, slot++) {
|
||||
struct sock *sk;
|
||||
struct hlist_nulls_node *node;
|
||||
struct udp_hslot *hslot = &table->hash[slot];
|
||||
struct sock *sk;
|
||||
|
||||
num = 0;
|
||||
|
||||
if (hlist_nulls_empty(&hslot->head))
|
||||
if (hlist_empty(&hslot->head))
|
||||
continue;
|
||||
|
||||
spin_lock_bh(&hslot->lock);
|
||||
sk_nulls_for_each(sk, node, &hslot->head) {
|
||||
sk_for_each(sk, &hslot->head) {
|
||||
struct inet_sock *inet = inet_sk(sk);
|
||||
|
||||
if (!net_eq(sock_net(sk), net))
|
||||
|
|
198
net/ipv6/udp.c
198
net/ipv6/udp.c
|
@ -213,37 +213,28 @@ static struct sock *udp6_lib_lookup2(struct net *net,
|
|||
struct sk_buff *skb)
|
||||
{
|
||||
struct sock *sk, *result;
|
||||
struct hlist_nulls_node *node;
|
||||
int score, badness, matches = 0, reuseport = 0;
|
||||
bool select_ok = true;
|
||||
u32 hash = 0;
|
||||
|
||||
begin:
|
||||
result = NULL;
|
||||
badness = -1;
|
||||
udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
|
||||
udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
|
||||
score = compute_score2(sk, net, saddr, sport,
|
||||
daddr, hnum, dif);
|
||||
if (score > badness) {
|
||||
result = sk;
|
||||
badness = score;
|
||||
reuseport = sk->sk_reuseport;
|
||||
if (reuseport) {
|
||||
hash = udp6_ehashfn(net, daddr, hnum,
|
||||
saddr, sport);
|
||||
if (select_ok) {
|
||||
struct sock *sk2;
|
||||
|
||||
sk2 = reuseport_select_sock(sk, hash, skb,
|
||||
result = reuseport_select_sock(sk, hash, skb,
|
||||
sizeof(struct udphdr));
|
||||
if (sk2) {
|
||||
result = sk2;
|
||||
select_ok = false;
|
||||
goto found;
|
||||
}
|
||||
}
|
||||
if (result)
|
||||
return result;
|
||||
matches = 1;
|
||||
}
|
||||
result = sk;
|
||||
badness = score;
|
||||
} else if (score == badness && reuseport) {
|
||||
matches++;
|
||||
if (reciprocal_scale(hash, matches) == 0)
|
||||
|
@ -251,27 +242,10 @@ begin:
|
|||
hash = next_pseudo_random32(hash);
|
||||
}
|
||||
}
|
||||
/*
|
||||
* if the nulls value we got at the end of this lookup is
|
||||
* not the expected one, we must restart lookup.
|
||||
* We probably met an item that was moved to another chain.
|
||||
*/
|
||||
if (get_nulls_value(node) != slot2)
|
||||
goto begin;
|
||||
|
||||
if (result) {
|
||||
found:
|
||||
if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
|
||||
result = NULL;
|
||||
else if (unlikely(compute_score2(result, net, saddr, sport,
|
||||
daddr, hnum, dif) < badness)) {
|
||||
sock_put(result);
|
||||
goto begin;
|
||||
}
|
||||
}
|
||||
return result;
|
||||
}
|
||||
|
||||
/* rcu_read_lock() must be held */
|
||||
struct sock *__udp6_lib_lookup(struct net *net,
|
||||
const struct in6_addr *saddr, __be16 sport,
|
||||
const struct in6_addr *daddr, __be16 dport,
|
||||
|
@ -279,15 +253,12 @@ struct sock *__udp6_lib_lookup(struct net *net,
|
|||
struct sk_buff *skb)
|
||||
{
|
||||
struct sock *sk, *result;
|
||||
struct hlist_nulls_node *node;
|
||||
unsigned short hnum = ntohs(dport);
|
||||
unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
|
||||
struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
|
||||
int score, badness, matches = 0, reuseport = 0;
|
||||
bool select_ok = true;
|
||||
u32 hash = 0;
|
||||
|
||||
rcu_read_lock();
|
||||
if (hslot->count > 10) {
|
||||
hash2 = udp6_portaddr_hash(net, daddr, hnum);
|
||||
slot2 = hash2 & udptable->mask;
|
||||
|
@ -309,34 +280,26 @@ struct sock *__udp6_lib_lookup(struct net *net,
|
|||
&in6addr_any, hnum, dif,
|
||||
hslot2, slot2, skb);
|
||||
}
|
||||
rcu_read_unlock();
|
||||
return result;
|
||||
}
|
||||
begin:
|
||||
result = NULL;
|
||||
badness = -1;
|
||||
sk_nulls_for_each_rcu(sk, node, &hslot->head) {
|
||||
sk_for_each_rcu(sk, &hslot->head) {
|
||||
score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif);
|
||||
if (score > badness) {
|
||||
result = sk;
|
||||
badness = score;
|
||||
reuseport = sk->sk_reuseport;
|
||||
if (reuseport) {
|
||||
hash = udp6_ehashfn(net, daddr, hnum,
|
||||
saddr, sport);
|
||||
if (select_ok) {
|
||||
struct sock *sk2;
|
||||
|
||||
sk2 = reuseport_select_sock(sk, hash, skb,
|
||||
result = reuseport_select_sock(sk, hash, skb,
|
||||
sizeof(struct udphdr));
|
||||
if (sk2) {
|
||||
result = sk2;
|
||||
select_ok = false;
|
||||
goto found;
|
||||
}
|
||||
}
|
||||
if (result)
|
||||
return result;
|
||||
matches = 1;
|
||||
}
|
||||
result = sk;
|
||||
badness = score;
|
||||
} else if (score == badness && reuseport) {
|
||||
matches++;
|
||||
if (reciprocal_scale(hash, matches) == 0)
|
||||
|
@ -344,25 +307,6 @@ begin:
|
|||
hash = next_pseudo_random32(hash);
|
||||
}
|
||||
}
|
||||
/*
|
||||
* if the nulls value we got at the end of this lookup is
|
||||
* not the expected one, we must restart lookup.
|
||||
* We probably met an item that was moved to another chain.
|
||||
*/
|
||||
if (get_nulls_value(node) != slot)
|
||||
goto begin;
|
||||
|
||||
if (result) {
|
||||
found:
|
||||
if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
|
||||
result = NULL;
|
||||
else if (unlikely(compute_score(result, net, hnum, saddr, sport,
|
||||
daddr, dport, dif) < badness)) {
|
||||
sock_put(result);
|
||||
goto begin;
|
||||
}
|
||||
}
|
||||
rcu_read_unlock();
|
||||
return result;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(__udp6_lib_lookup);
|
||||
|
@ -382,12 +326,24 @@ static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb,
|
|||
udptable, skb);
|
||||
}
|
||||
|
||||
/* Must be called under rcu_read_lock().
|
||||
* Does increment socket refcount.
|
||||
*/
|
||||
#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
|
||||
IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY)
|
||||
struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport,
|
||||
const struct in6_addr *daddr, __be16 dport, int dif)
|
||||
{
|
||||
return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table, NULL);
|
||||
struct sock *sk;
|
||||
|
||||
sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport,
|
||||
dif, &udp_table, NULL);
|
||||
if (sk && !atomic_inc_not_zero(&sk->sk_refcnt))
|
||||
sk = NULL;
|
||||
return sk;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(udp6_lib_lookup);
|
||||
#endif
|
||||
|
||||
/*
|
||||
* This should be easy, if there is something there we
|
||||
|
@ -585,7 +541,7 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|||
sk->sk_err = err;
|
||||
sk->sk_error_report(sk);
|
||||
out:
|
||||
sock_put(sk);
|
||||
return;
|
||||
}
|
||||
|
||||
static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
||||
|
@ -747,33 +703,6 @@ static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk,
|
|||
return true;
|
||||
}
|
||||
|
||||
static void flush_stack(struct sock **stack, unsigned int count,
|
||||
struct sk_buff *skb, unsigned int final)
|
||||
{
|
||||
struct sk_buff *skb1 = NULL;
|
||||
struct sock *sk;
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < count; i++) {
|
||||
sk = stack[i];
|
||||
if (likely(!skb1))
|
||||
skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
|
||||
if (!skb1) {
|
||||
atomic_inc(&sk->sk_drops);
|
||||
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
}
|
||||
|
||||
if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0)
|
||||
skb1 = NULL;
|
||||
sock_put(sk);
|
||||
}
|
||||
if (unlikely(skb1))
|
||||
kfree_skb(skb1);
|
||||
}
|
||||
|
||||
static void udp6_csum_zero_error(struct sk_buff *skb)
|
||||
{
|
||||
/* RFC 2460 section 8.1 says that we SHOULD log
|
||||
|
@ -792,15 +721,15 @@ static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
|
|||
const struct in6_addr *saddr, const struct in6_addr *daddr,
|
||||
struct udp_table *udptable, int proto)
|
||||
{
|
||||
struct sock *sk, *stack[256 / sizeof(struct sock *)];
|
||||
struct sock *sk, *first = NULL;
|
||||
const struct udphdr *uh = udp_hdr(skb);
|
||||
struct hlist_nulls_node *node;
|
||||
unsigned short hnum = ntohs(uh->dest);
|
||||
struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
|
||||
int dif = inet6_iif(skb);
|
||||
unsigned int count = 0, offset = offsetof(typeof(*sk), sk_nulls_node);
|
||||
unsigned int offset = offsetof(typeof(*sk), sk_node);
|
||||
unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
|
||||
bool inner_flushed = false;
|
||||
int dif = inet6_iif(skb);
|
||||
struct hlist_node *node;
|
||||
struct sk_buff *nskb;
|
||||
|
||||
if (use_hash2) {
|
||||
hash2_any = udp6_portaddr_hash(net, &in6addr_any, hnum) &
|
||||
|
@ -811,27 +740,32 @@ start_lookup:
|
|||
offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
|
||||
}
|
||||
|
||||
spin_lock(&hslot->lock);
|
||||
sk_nulls_for_each_entry_offset(sk, node, &hslot->head, offset) {
|
||||
if (__udp_v6_is_mcast_sock(net, sk,
|
||||
uh->dest, daddr,
|
||||
uh->source, saddr,
|
||||
dif, hnum) &&
|
||||
/* If zero checksum and no_check is not on for
|
||||
* the socket then skip it.
|
||||
*/
|
||||
(uh->check || udp_sk(sk)->no_check6_rx)) {
|
||||
if (unlikely(count == ARRAY_SIZE(stack))) {
|
||||
flush_stack(stack, count, skb, ~0);
|
||||
inner_flushed = true;
|
||||
count = 0;
|
||||
}
|
||||
stack[count++] = sk;
|
||||
sock_hold(sk);
|
||||
sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
|
||||
if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr,
|
||||
uh->source, saddr, dif, hnum))
|
||||
continue;
|
||||
/* If zero checksum and no_check is not on for
|
||||
* the socket then skip it.
|
||||
*/
|
||||
if (!uh->check && !udp_sk(sk)->no_check6_rx)
|
||||
continue;
|
||||
if (!first) {
|
||||
first = sk;
|
||||
continue;
|
||||
}
|
||||
nskb = skb_clone(skb, GFP_ATOMIC);
|
||||
if (unlikely(!nskb)) {
|
||||
atomic_inc(&sk->sk_drops);
|
||||
UDP6_INC_STATS_BH(net, UDP_MIB_RCVBUFERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS,
|
||||
IS_UDPLITE(sk));
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
spin_unlock(&hslot->lock);
|
||||
if (udpv6_queue_rcv_skb(sk, nskb) > 0)
|
||||
consume_skb(nskb);
|
||||
}
|
||||
|
||||
/* Also lookup *:port if we are using hash2 and haven't done so yet. */
|
||||
if (use_hash2 && hash2 != hash2_any) {
|
||||
|
@ -839,13 +773,13 @@ start_lookup:
|
|||
goto start_lookup;
|
||||
}
|
||||
|
||||
if (count) {
|
||||
flush_stack(stack, count, skb, count - 1);
|
||||
if (first) {
|
||||
if (udpv6_queue_rcv_skb(first, skb) > 0)
|
||||
consume_skb(skb);
|
||||
} else {
|
||||
if (!inner_flushed)
|
||||
UDP6_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
|
||||
proto == IPPROTO_UDPLITE);
|
||||
consume_skb(skb);
|
||||
kfree_skb(skb);
|
||||
UDP6_INC_STATS_BH(net, UDP_MIB_IGNOREDMULTI,
|
||||
proto == IPPROTO_UDPLITE);
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
@ -853,10 +787,10 @@ start_lookup:
|
|||
int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
||||
int proto)
|
||||
{
|
||||
struct net *net = dev_net(skb->dev);
|
||||
struct sock *sk;
|
||||
struct udphdr *uh;
|
||||
const struct in6_addr *saddr, *daddr;
|
||||
struct net *net = dev_net(skb->dev);
|
||||
struct udphdr *uh;
|
||||
struct sock *sk;
|
||||
u32 ulen = 0;
|
||||
|
||||
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
|
||||
|
@ -910,7 +844,6 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
|||
int ret;
|
||||
|
||||
if (!uh->check && !udp_sk(sk)->no_check6_rx) {
|
||||
sock_put(sk);
|
||||
udp6_csum_zero_error(skb);
|
||||
goto csum_error;
|
||||
}
|
||||
|
@ -920,7 +853,6 @@ int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
|||
ip6_compute_pseudo);
|
||||
|
||||
ret = udpv6_queue_rcv_skb(sk, skb);
|
||||
sock_put(sk);
|
||||
|
||||
/* a return value > 0 means to resubmit the input */
|
||||
if (ret > 0)
|
||||
|
|
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