#include <linux/mm.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
+#include <linux/slab.h>
#include <net/tcp_states.h>
#include <linux/skbuff.h>
#include <linux/proc_fs.h>
#include <net/xfrm.h>
#include "udp_impl.h"
-struct udp_table udp_table;
+struct udp_table udp_table __read_mostly;
EXPORT_SYMBOL(udp_table);
int sysctl_udp_mem[3] __read_mostly;
-int sysctl_udp_rmem_min __read_mostly;
-int sysctl_udp_wmem_min __read_mostly;
-
EXPORT_SYMBOL(sysctl_udp_mem);
+
+int sysctl_udp_rmem_min __read_mostly;
EXPORT_SYMBOL(sysctl_udp_rmem_min);
+
+int sysctl_udp_wmem_min __read_mostly;
EXPORT_SYMBOL(sysctl_udp_wmem_min);
atomic_t udp_memory_allocated;
EXPORT_SYMBOL(udp_memory_allocated);
-#define PORTS_PER_CHAIN (65536 / UDP_HTABLE_SIZE)
+#define MAX_UDP_PORTS 65536
+#define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
static int udp_lib_lport_inuse(struct net *net, __u16 num,
const struct udp_hslot *hslot,
unsigned long *bitmap,
struct sock *sk,
int (*saddr_comp)(const struct sock *sk1,
- const struct sock *sk2))
+ const struct sock *sk2),
+ unsigned int log)
{
struct sock *sk2;
struct hlist_nulls_node *node;
sk_nulls_for_each(sk2, node, &hslot->head)
- if (net_eq(sock_net(sk2), net) &&
- sk2 != sk &&
- (bitmap || sk2->sk_hash == num) &&
- (!sk2->sk_reuse || !sk->sk_reuse) &&
- (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if
- || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+ if (net_eq(sock_net(sk2), net) &&
+ sk2 != sk &&
+ (bitmap || udp_sk(sk2)->udp_port_hash == num) &&
+ (!sk2->sk_reuse || !sk->sk_reuse) &&
+ (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
+ sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
(*saddr_comp)(sk, sk2)) {
if (bitmap)
- __set_bit(sk2->sk_hash / UDP_HTABLE_SIZE,
+ __set_bit(udp_sk(sk2)->udp_port_hash >> log,
bitmap);
else
return 1;
return 0;
}
+/*
+ * Note: we still hold spinlock of primary hash chain, so no other writer
+ * can insert/delete a socket with local_port == num
+ */
+static int udp_lib_lport_inuse2(struct net *net, __u16 num,
+ struct udp_hslot *hslot2,
+ struct sock *sk,
+ int (*saddr_comp)(const struct sock *sk1,
+ const struct sock *sk2))
+{
+ struct sock *sk2;
+ struct hlist_nulls_node *node;
+ int res = 0;
+
+ spin_lock(&hslot2->lock);
+ udp_portaddr_for_each_entry(sk2, node, &hslot2->head)
+ if (net_eq(sock_net(sk2), net) &&
+ sk2 != sk &&
+ (udp_sk(sk2)->udp_port_hash == num) &&
+ (!sk2->sk_reuse || !sk->sk_reuse) &&
+ (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
+ sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
+ (*saddr_comp)(sk, sk2)) {
+ res = 1;
+ break;
+ }
+ spin_unlock(&hslot2->lock);
+ return res;
+}
+
/**
* udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
*
* @sk: socket struct in question
* @snum: port number to look up
* @saddr_comp: AF-dependent comparison of bound local IP addresses
+ * @hash2_nulladdr: AF-dependant hash value in secondary hash chains,
+ * with NULL address
*/
int udp_lib_get_port(struct sock *sk, unsigned short snum,
int (*saddr_comp)(const struct sock *sk1,
- const struct sock *sk2 ) )
+ const struct sock *sk2),
+ unsigned int hash2_nulladdr)
{
- struct udp_hslot *hslot;
+ struct udp_hslot *hslot, *hslot2;
struct udp_table *udptable = sk->sk_prot->h.udp_table;
int error = 1;
struct net *net = sock_net(sk);
/*
* force rand to be an odd multiple of UDP_HTABLE_SIZE
*/
- rand = (rand | 1) * UDP_HTABLE_SIZE;
- for (last = first + UDP_HTABLE_SIZE; first != last; first++) {
- hslot = &udptable->hash[udp_hashfn(net, first)];
+ rand = (rand | 1) * (udptable->mask + 1);
+ last = first + udptable->mask + 1;
+ do {
+ hslot = udp_hashslot(udptable, net, first);
bitmap_zero(bitmap, PORTS_PER_CHAIN);
spin_lock_bh(&hslot->lock);
udp_lib_lport_inuse(net, snum, hslot, bitmap, sk,
- saddr_comp);
+ saddr_comp, udptable->log);
snum = first;
/*
*/
do {
if (low <= snum && snum <= high &&
- !test_bit(snum / UDP_HTABLE_SIZE, bitmap))
+ !test_bit(snum >> udptable->log, bitmap))
goto found;
snum += rand;
} while (snum != first);
spin_unlock_bh(&hslot->lock);
- }
+ } while (++first != last);
goto fail;
} else {
- hslot = &udptable->hash[udp_hashfn(net, snum)];
+ hslot = udp_hashslot(udptable, net, snum);
spin_lock_bh(&hslot->lock);
- if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, saddr_comp))
+ if (hslot->count > 10) {
+ int exist;
+ unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum;
+
+ slot2 &= udptable->mask;
+ hash2_nulladdr &= udptable->mask;
+
+ hslot2 = udp_hashslot2(udptable, slot2);
+ if (hslot->count < hslot2->count)
+ goto scan_primary_hash;
+
+ exist = udp_lib_lport_inuse2(net, snum, hslot2,
+ sk, saddr_comp);
+ if (!exist && (hash2_nulladdr != slot2)) {
+ hslot2 = udp_hashslot2(udptable, hash2_nulladdr);
+ exist = udp_lib_lport_inuse2(net, snum, hslot2,
+ sk, saddr_comp);
+ }
+ if (exist)
+ goto fail_unlock;
+ else
+ goto found;
+ }
+scan_primary_hash:
+ if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk,
+ saddr_comp, 0))
goto fail_unlock;
}
found:
- inet_sk(sk)->num = snum;
- sk->sk_hash = snum;
+ inet_sk(sk)->inet_num = snum;
+ udp_sk(sk)->udp_port_hash = snum;
+ udp_sk(sk)->udp_portaddr_hash ^= snum;
if (sk_unhashed(sk)) {
sk_nulls_add_node_rcu(sk, &hslot->head);
+ hslot->count++;
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
+
+ hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
+ spin_lock(&hslot2->lock);
+ hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
+ &hslot2->head);
+ hslot2->count++;
+ spin_unlock(&hslot2->lock);
}
error = 0;
fail_unlock:
fail:
return error;
}
+EXPORT_SYMBOL(udp_lib_get_port);
static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
{
struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
- return ( !ipv6_only_sock(sk2) &&
- (!inet1->rcv_saddr || !inet2->rcv_saddr ||
- inet1->rcv_saddr == inet2->rcv_saddr ));
+ return (!ipv6_only_sock(sk2) &&
+ (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr ||
+ inet1->inet_rcv_saddr == inet2->inet_rcv_saddr));
+}
+
+static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr,
+ unsigned int port)
+{
+ return jhash_1word(saddr, net_hash_mix(net)) ^ port;
}
int udp_v4_get_port(struct sock *sk, unsigned short snum)
{
- return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal);
+ unsigned int hash2_nulladdr =
+ udp4_portaddr_hash(sock_net(sk), INADDR_ANY, snum);
+ unsigned int hash2_partial =
+ udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0);
+
+ /* precompute partial secondary hash */
+ udp_sk(sk)->udp_portaddr_hash = hash2_partial;
+ return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr);
}
static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr,
{
int score = -1;
- if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
+ if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
!ipv6_only_sock(sk)) {
struct inet_sock *inet = inet_sk(sk);
score = (sk->sk_family == PF_INET ? 1 : 0);
- if (inet->rcv_saddr) {
- if (inet->rcv_saddr != daddr)
+ if (inet->inet_rcv_saddr) {
+ if (inet->inet_rcv_saddr != daddr)
+ return -1;
+ score += 2;
+ }
+ if (inet->inet_daddr) {
+ if (inet->inet_daddr != saddr)
+ return -1;
+ score += 2;
+ }
+ if (inet->inet_dport) {
+ if (inet->inet_dport != sport)
+ return -1;
+ score += 2;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
return -1;
score += 2;
}
- if (inet->daddr) {
- if (inet->daddr != saddr)
+ }
+ return score;
+}
+
+/*
+ * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num)
+ */
+#define SCORE2_MAX (1 + 2 + 2 + 2)
+static inline int compute_score2(struct sock *sk, struct net *net,
+ __be32 saddr, __be16 sport,
+ __be32 daddr, unsigned int hnum, int dif)
+{
+ int score = -1;
+
+ if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (inet->inet_rcv_saddr != daddr)
+ return -1;
+ if (inet->inet_num != hnum)
+ return -1;
+
+ score = (sk->sk_family == PF_INET ? 1 : 0);
+ if (inet->inet_daddr) {
+ if (inet->inet_daddr != saddr)
return -1;
score += 2;
}
- if (inet->dport) {
- if (inet->dport != sport)
+ if (inet->inet_dport) {
+ if (inet->inet_dport != sport)
return -1;
score += 2;
}
return score;
}
+
+/* called with read_rcu_lock() */
+static struct sock *udp4_lib_lookup2(struct net *net,
+ __be32 saddr, __be16 sport,
+ __be32 daddr, unsigned int hnum, int dif,
+ struct udp_hslot *hslot2, unsigned int slot2)
+{
+ struct sock *sk, *result;
+ struct hlist_nulls_node *node;
+ int score, badness;
+
+begin:
+ result = NULL;
+ badness = -1;
+ udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
+ score = compute_score2(sk, net, saddr, sport,
+ daddr, hnum, dif);
+ if (score > badness) {
+ result = sk;
+ badness = score;
+ if (score == SCORE2_MAX)
+ goto exact_match;
+ }
+ }
+ /*
+ * 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) {
+exact_match:
+ if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt)))
+ result = NULL;
+ else if (unlikely(compute_score2(result, net, saddr, sport,
+ daddr, hnum, dif) < badness)) {
+ sock_put(result);
+ goto begin;
+ }
+ }
+ return result;
+}
+
/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
* harder than this. -DaveM
*/
struct sock *sk, *result;
struct hlist_nulls_node *node;
unsigned short hnum = ntohs(dport);
- unsigned int hash = udp_hashfn(net, hnum);
- struct udp_hslot *hslot = &udptable->hash[hash];
+ unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
+ struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
int score, badness;
rcu_read_lock();
+ if (hslot->count > 10) {
+ hash2 = udp4_portaddr_hash(net, daddr, hnum);
+ slot2 = hash2 & udptable->mask;
+ hslot2 = &udptable->hash2[slot2];
+ if (hslot->count < hslot2->count)
+ goto begin;
+
+ result = udp4_lib_lookup2(net, saddr, sport,
+ daddr, hnum, dif,
+ hslot2, slot2);
+ if (!result) {
+ hash2 = udp4_portaddr_hash(net, INADDR_ANY, hnum);
+ slot2 = hash2 & udptable->mask;
+ hslot2 = &udptable->hash2[slot2];
+ if (hslot->count < hslot2->count)
+ goto begin;
+
+ result = udp4_lib_lookup2(net, INADDR_ANY, sport,
+ daddr, hnum, dif,
+ hslot2, slot2);
+ }
+ rcu_read_unlock();
+ return result;
+ }
begin:
result = NULL;
badness = -1;
* not the expected one, we must restart lookup.
* We probably met an item that was moved to another chain.
*/
- if (get_nulls_value(node) != hash)
+ if (get_nulls_value(node) != slot)
goto begin;
if (result) {
if (unlikely(sk = skb_steal_sock(skb)))
return sk;
else
- return __udp4_lib_lookup(dev_net(skb->dst->dev), iph->saddr, sport,
+ return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport,
iph->daddr, dport, inet_iif(skb),
udptable);
}
sk_nulls_for_each_from(s, node) {
struct inet_sock *inet = inet_sk(s);
- if (!net_eq(sock_net(s), net) ||
- s->sk_hash != hnum ||
- (inet->daddr && inet->daddr != rmt_addr) ||
- (inet->dport != rmt_port && inet->dport) ||
- (inet->rcv_saddr && inet->rcv_saddr != loc_addr) ||
- ipv6_only_sock(s) ||
+ if (!net_eq(sock_net(s), net) ||
+ udp_sk(s)->udp_port_hash != hnum ||
+ (inet->inet_daddr && inet->inet_daddr != rmt_addr) ||
+ (inet->inet_dport != rmt_port && inet->inet_dport) ||
+ (inet->inet_rcv_saddr &&
+ inet->inet_rcv_saddr != loc_addr) ||
+ ipv6_only_sock(s) ||
(s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
continue;
if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
{
struct inet_sock *inet;
- struct iphdr *iph = (struct iphdr*)skb->data;
- struct udphdr *uh = (struct udphdr*)(skb->data+(iph->ihl<<2));
+ struct iphdr *iph = (struct iphdr *)skb->data;
+ struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2));
const int type = icmp_hdr(skb)->type;
const int code = icmp_hdr(skb)->code;
struct sock *sk;
if (!harderr || sk->sk_state != TCP_ESTABLISHED)
goto out;
} else {
- ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
+ ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1));
}
sk->sk_err = err;
sk->sk_error_report(sk);
* (checksum field must be zeroed out)
*/
static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
- __be32 src, __be32 dst, int len )
+ __be32 src, __be32 dst, int len)
{
unsigned int offset;
struct udphdr *uh = udp_hdr(skb);
} else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
- udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
+ udp4_hwcsum_outgoing(sk, skb, fl->fl4_src, fl->fl4_dst, up->len);
goto send;
} else /* `normal' UDP */
/* add protocol-dependent pseudo-header */
uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
- sk->sk_protocol, csum );
+ sk->sk_protocol, csum);
if (uh->check == 0)
uh->check = CSUM_MANGLED_0;
send:
err = ip_push_pending_frames(sk);
+ if (err) {
+ if (err == -ENOBUFS && !inet->recverr) {
+ UDP_INC_STATS_USER(sock_net(sk),
+ UDP_MIB_SNDBUFERRORS, is_udplite);
+ err = 0;
+ }
+ } else
+ UDP_INC_STATS_USER(sock_net(sk),
+ UDP_MIB_OUTDATAGRAMS, is_udplite);
out:
up->len = 0;
up->pending = 0;
- if (!err)
- UDP_INC_STATS_USER(sock_net(sk),
- UDP_MIB_OUTDATAGRAMS, is_udplite);
return err;
}
* Check the flags.
*/
- if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
+ if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */
return -EOPNOTSUPP;
ipc.opt = NULL;
* Get and verify the address.
*/
if (msg->msg_name) {
- struct sockaddr_in * usin = (struct sockaddr_in*)msg->msg_name;
+ struct sockaddr_in * usin = (struct sockaddr_in *)msg->msg_name;
if (msg->msg_namelen < sizeof(*usin))
return -EINVAL;
if (usin->sin_family != AF_INET) {
} else {
if (sk->sk_state != TCP_ESTABLISHED)
return -EDESTADDRREQ;
- daddr = inet->daddr;
- dport = inet->dport;
+ daddr = inet->inet_daddr;
+ dport = inet->inet_dport;
/* Open fast path for connected socket.
Route will not be used, if at least one option is set.
*/
connected = 1;
}
- ipc.addr = inet->saddr;
+ ipc.addr = inet->inet_saddr;
ipc.oif = sk->sk_bound_dev_if;
err = sock_tx_timestamp(msg, sk, &ipc.shtx);
}
if (connected)
- rt = (struct rtable*)sk_dst_check(sk, 0);
+ rt = (struct rtable *)sk_dst_check(sk, 0);
if (rt == NULL) {
struct flowi fl = { .oif = ipc.oif,
+ .mark = sk->sk_mark,
.nl_u = { .ip4_u =
{ .daddr = faddr,
.saddr = saddr,
.proto = sk->sk_protocol,
.flags = inet_sk_flowi_flags(sk),
.uli_u = { .ports =
- { .sport = inet->sport,
+ { .sport = inet->inet_sport,
.dport = dport } } };
struct net *net = sock_net(sk);
inet->cork.fl.fl4_dst = daddr;
inet->cork.fl.fl_ip_dport = dport;
inet->cork.fl.fl4_src = saddr;
- inet->cork.fl.fl_ip_sport = inet->sport;
+ inet->cork.fl.fl_ip_sport = inet->inet_sport;
up->pending = AF_INET;
do_append_data:
err = 0;
goto out;
}
+EXPORT_SYMBOL(udp_sendmsg);
int udp_sendpage(struct sock *sk, struct page *page, int offset,
size_t size, int flags)
return ret;
}
+
+/**
+ * first_packet_length - return length of first packet in receive queue
+ * @sk: socket
+ *
+ * Drops all bad checksum frames, until a valid one is found.
+ * Returns the length of found skb, or 0 if none is found.
+ */
+static unsigned int first_packet_length(struct sock *sk)
+{
+ struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue;
+ struct sk_buff *skb;
+ unsigned int res;
+
+ __skb_queue_head_init(&list_kill);
+
+ spin_lock_bh(&rcvq->lock);
+ while ((skb = skb_peek(rcvq)) != NULL &&
+ udp_lib_checksum_complete(skb)) {
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
+ IS_UDPLITE(sk));
+ atomic_inc(&sk->sk_drops);
+ __skb_unlink(skb, rcvq);
+ __skb_queue_tail(&list_kill, skb);
+ }
+ res = skb ? skb->len : 0;
+ spin_unlock_bh(&rcvq->lock);
+
+ if (!skb_queue_empty(&list_kill)) {
+ lock_sock(sk);
+ __skb_queue_purge(&list_kill);
+ sk_mem_reclaim_partial(sk);
+ release_sock(sk);
+ }
+ return res;
+}
+
/*
* IOCTL requests applicable to the UDP protocol
*/
switch (cmd) {
case SIOCOUTQ:
{
- int amount = atomic_read(&sk->sk_wmem_alloc);
+ int amount = sk_wmem_alloc_get(sk);
+
return put_user(amount, (int __user *)arg);
}
case SIOCINQ:
{
- struct sk_buff *skb;
- unsigned long amount;
+ unsigned int amount = first_packet_length(sk);
- amount = 0;
- spin_lock_bh(&sk->sk_receive_queue.lock);
- skb = skb_peek(&sk->sk_receive_queue);
- if (skb != NULL) {
+ if (amount)
/*
* We will only return the amount
* of this packet since that is all
* that will be read.
*/
- amount = skb->len - sizeof(struct udphdr);
- }
- spin_unlock_bh(&sk->sk_receive_queue.lock);
+ amount -= sizeof(struct udphdr);
+
return put_user(amount, (int __user *)arg);
}
return 0;
}
+EXPORT_SYMBOL(udp_ioctl);
/*
* This should be easy, if there is something there we
struct inet_sock *inet = inet_sk(sk);
struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name;
struct sk_buff *skb;
- unsigned int ulen, copied;
+ unsigned int ulen;
int peeked;
int err;
int is_udplite = IS_UDPLITE(sk);
* Check any passed addresses
*/
if (addr_len)
- *addr_len=sizeof(*sin);
+ *addr_len = sizeof(*sin);
if (flags & MSG_ERRQUEUE)
return ip_recv_error(sk, msg, len);
goto out;
ulen = skb->len - sizeof(struct udphdr);
- copied = len;
- if (copied > ulen)
- copied = ulen;
- else if (copied < ulen)
+ if (len > ulen)
+ len = ulen;
+ else if (len < ulen)
msg->msg_flags |= MSG_TRUNC;
/*
* coverage checksum (UDP-Lite), do it before the copy.
*/
- if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
+ if (len < ulen || UDP_SKB_CB(skb)->partial_cov) {
if (udp_lib_checksum_complete(skb))
goto csum_copy_err;
}
if (skb_csum_unnecessary(skb))
err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
- msg->msg_iov, copied );
+ msg->msg_iov, len);
else {
- err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
+ err = skb_copy_and_csum_datagram_iovec(skb,
+ sizeof(struct udphdr),
+ msg->msg_iov);
if (err == -EINVAL)
goto csum_copy_err;
UDP_INC_STATS_USER(sock_net(sk),
UDP_MIB_INDATAGRAMS, is_udplite);
- sock_recv_timestamp(msg, sk, skb);
+ sock_recv_ts_and_drops(msg, sk, skb);
/* Copy the address. */
- if (sin)
- {
+ if (sin) {
sin->sin_family = AF_INET;
sin->sin_port = udp_hdr(skb)->source;
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
if (inet->cmsg_flags)
ip_cmsg_recv(msg, skb);
- err = copied;
+ err = len;
if (flags & MSG_TRUNC)
err = ulen;
out_free:
- lock_sock(sk);
- skb_free_datagram(sk, skb);
- release_sock(sk);
+ skb_free_datagram_locked(sk, skb);
out:
return err;
*/
sk->sk_state = TCP_CLOSE;
- inet->daddr = 0;
- inet->dport = 0;
+ inet->inet_daddr = 0;
+ inet->inet_dport = 0;
sk->sk_bound_dev_if = 0;
if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
inet_reset_saddr(sk);
if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
sk->sk_prot->unhash(sk);
- inet->sport = 0;
+ inet->inet_sport = 0;
}
sk_dst_reset(sk);
return 0;
}
+EXPORT_SYMBOL(udp_disconnect);
void udp_lib_unhash(struct sock *sk)
{
if (sk_hashed(sk)) {
struct udp_table *udptable = sk->sk_prot->h.udp_table;
- unsigned int hash = udp_hashfn(sock_net(sk), sk->sk_hash);
- struct udp_hslot *hslot = &udptable->hash[hash];
+ struct udp_hslot *hslot, *hslot2;
+
+ hslot = udp_hashslot(udptable, sock_net(sk),
+ udp_sk(sk)->udp_port_hash);
+ hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
spin_lock_bh(&hslot->lock);
if (sk_nulls_del_node_init_rcu(sk)) {
- inet_sk(sk)->num = 0;
+ hslot->count--;
+ inet_sk(sk)->inet_num = 0;
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
+
+ spin_lock(&hslot2->lock);
+ hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
+ hslot2->count--;
+ spin_unlock(&hslot2->lock);
}
spin_unlock_bh(&hslot->lock);
}
static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
- int is_udplite = IS_UDPLITE(sk);
- int rc;
+ int rc = sock_queue_rcv_skb(sk, skb);
+
+ if (rc < 0) {
+ int is_udplite = IS_UDPLITE(sk);
- if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
/* Note that an ENOMEM error is charged twice */
- if (rc == -ENOMEM) {
+ if (rc == -ENOMEM)
UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
is_udplite);
- atomic_inc(&sk->sk_drops);
- }
- goto drop;
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
+ kfree_skb(skb);
+ return -1;
}
return 0;
-drop:
- UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
- kfree_skb(skb);
- return -1;
}
/* returns:
* Note that in the success and error cases, the skb is assumed to
* have either been requeued or freed.
*/
-int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
+int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
struct udp_sock *up = udp_sk(sk);
int rc;
bh_lock_sock(sk);
if (!sock_owned_by_user(sk))
rc = __udp_queue_rcv_skb(sk, skb);
- else
- sk_add_backlog(sk, skb);
+ else if (sk_add_backlog(sk, skb)) {
+ bh_unlock_sock(sk);
+ goto drop;
+ }
bh_unlock_sock(sk);
return rc;
drop:
UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
+ atomic_inc(&sk->sk_drops);
kfree_skb(skb);
return -1;
}
+
+static void flush_stack(struct sock **stack, unsigned int count,
+ 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];
+ if (likely(skb1 == NULL))
+ skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
+
+ if (!skb1) {
+ atomic_inc(&sk->sk_drops);
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
+ IS_UDPLITE(sk));
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
+ IS_UDPLITE(sk));
+ }
+
+ if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0)
+ skb1 = NULL;
+ }
+ if (unlikely(skb1))
+ kfree_skb(skb1);
+}
+
/*
* Multicasts and broadcasts go to each listener.
*
- * Note: called only from the BH handler context,
- * so we don't need to lock the hashes.
+ * Note: called only from the BH handler context.
*/
static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
struct udphdr *uh,
__be32 saddr, __be32 daddr,
struct udp_table *udptable)
{
- struct sock *sk;
- struct udp_hslot *hslot = &udptable->hash[udp_hashfn(net, ntohs(uh->dest))];
+ struct sock *sk, *stack[256 / sizeof(struct sock *)];
+ struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
int dif;
+ unsigned int i, count = 0;
spin_lock(&hslot->lock);
sk = sk_nulls_head(&hslot->head);
dif = skb->dev->ifindex;
sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
- if (sk) {
- struct sock *sknext = NULL;
+ while (sk) {
+ stack[count++] = sk;
+ sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
+ daddr, uh->source, saddr, dif);
+ if (unlikely(count == ARRAY_SIZE(stack))) {
+ if (!sk)
+ break;
+ flush_stack(stack, count, skb, ~0);
+ count = 0;
+ }
+ }
+ /*
+ * before releasing chain lock, we must take a reference on sockets
+ */
+ for (i = 0; i < count; i++)
+ sock_hold(stack[i]);
- do {
- struct sk_buff *skb1 = skb;
-
- sknext = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
- daddr, uh->source, saddr,
- dif);
- if (sknext)
- skb1 = skb_clone(skb, GFP_ATOMIC);
-
- if (skb1) {
- int ret = udp_queue_rcv_skb(sk, skb1);
- if (ret > 0)
- /* we should probably re-process instead
- * of dropping packets here. */
- kfree_skb(skb1);
- }
- sk = sknext;
- } while (sknext);
- } else
- kfree_skb(skb);
spin_unlock(&hslot->lock);
+
+ /*
+ * do the slow work with no lock held
+ */
+ if (count) {
+ flush_stack(stack, count, skb, count - 1);
+
+ for (i = 0; i < count; i++)
+ sock_put(stack[i]);
+ } else {
+ kfree_skb(skb);
+ }
return 0;
}
if (uh->check == 0) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else if (skb->ip_summed == CHECKSUM_COMPLETE) {
- if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
+ if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
proto, skb->csum))
skb->ip_summed = CHECKSUM_UNNECESSARY;
}
struct sock *sk;
struct udphdr *uh;
unsigned short ulen;
- struct rtable *rt = (struct rtable*)skb->dst;
+ struct rtable *rt = skb_rtable(skb);
__be32 saddr, daddr;
struct net *net = dev_net(skb->dev);
* Socket option code for UDP
*/
int udp_lib_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen,
+ char __user *optval, unsigned int optlen,
int (*push_pending_frames)(struct sock *))
{
struct udp_sock *up = udp_sk(sk);
int err = 0;
int is_udplite = IS_UDPLITE(sk);
- if (optlen<sizeof(int))
+ if (optlen < sizeof(int))
return -EINVAL;
if (get_user(val, (int __user *)optval))
return err;
}
+EXPORT_SYMBOL(udp_lib_setsockopt);
int udp_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen)
+ char __user *optval, unsigned int optlen)
{
if (level == SOL_UDP || level == SOL_UDPLITE)
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
#ifdef CONFIG_COMPAT
int compat_udp_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen)
+ char __user *optval, unsigned int optlen)
{
if (level == SOL_UDP || level == SOL_UDPLITE)
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
struct udp_sock *up = udp_sk(sk);
int val, len;
- if (get_user(len,optlen))
+ if (get_user(len, optlen))
return -EFAULT;
len = min_t(unsigned int, len, sizeof(int));
if (put_user(len, optlen))
return -EFAULT;
- if (copy_to_user(optval, &val,len))
+ if (copy_to_user(optval, &val, len))
return -EFAULT;
return 0;
}
+EXPORT_SYMBOL(udp_lib_getsockopt);
int udp_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
unsigned int mask = datagram_poll(file, sock, wait);
struct sock *sk = sock->sk;
- int is_lite = IS_UDPLITE(sk);
/* Check for false positives due to checksum errors */
- if ( (mask & POLLRDNORM) &&
- !(file->f_flags & O_NONBLOCK) &&
- !(sk->sk_shutdown & RCV_SHUTDOWN)){
- struct sk_buff_head *rcvq = &sk->sk_receive_queue;
- struct sk_buff *skb;
-
- spin_lock_bh(&rcvq->lock);
- while ((skb = skb_peek(rcvq)) != NULL &&
- udp_lib_checksum_complete(skb)) {
- UDP_INC_STATS_BH(sock_net(sk),
- UDP_MIB_INERRORS, is_lite);
- __skb_unlink(skb, rcvq);
- kfree_skb(skb);
- }
- spin_unlock_bh(&rcvq->lock);
-
- /* nothing to see, move along */
- if (skb == NULL)
- mask &= ~(POLLIN | POLLRDNORM);
- }
+ if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
+ !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk))
+ mask &= ~(POLLIN | POLLRDNORM);
return mask;
}
+EXPORT_SYMBOL(udp_poll);
struct proto udp_prot = {
.name = "UDP",
.compat_getsockopt = compat_udp_getsockopt,
#endif
};
+EXPORT_SYMBOL(udp_prot);
/* ------------------------------------------------------------------------ */
#ifdef CONFIG_PROC_FS
struct udp_iter_state *state = seq->private;
struct net *net = seq_file_net(seq);
- for (state->bucket = start; state->bucket < UDP_HTABLE_SIZE; ++state->bucket) {
+ 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))
+ continue;
+
spin_lock_bh(&hslot->lock);
sk_nulls_for_each(sk, node, &hslot->head) {
if (!net_eq(sock_net(sk), net))
} while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family));
if (!sk) {
- spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
+ if (state->bucket <= state->udp_table->mask)
+ spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
return udp_get_first(seq, state->bucket + 1);
}
return sk;
static void *udp_seq_start(struct seq_file *seq, loff_t *pos)
{
+ struct udp_iter_state *state = seq->private;
+ state->bucket = MAX_UDP_PORTS;
+
return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
}
{
struct udp_iter_state *state = seq->private;
- if (state->bucket < UDP_HTABLE_SIZE)
+ if (state->bucket <= state->udp_table->mask)
spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
}
rc = -ENOMEM;
return rc;
}
+EXPORT_SYMBOL(udp_proc_register);
void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo)
{
proc_net_remove(net, afinfo->name);
}
+EXPORT_SYMBOL(udp_proc_unregister);
/* ------------------------------------------------------------------------ */
static void udp4_format_sock(struct sock *sp, struct seq_file *f,
int bucket, int *len)
{
struct inet_sock *inet = inet_sk(sp);
- __be32 dest = inet->daddr;
- __be32 src = inet->rcv_saddr;
- __u16 destp = ntohs(inet->dport);
- __u16 srcp = ntohs(inet->sport);
+ __be32 dest = inet->inet_daddr;
+ __be32 src = inet->inet_rcv_saddr;
+ __u16 destp = ntohs(inet->inet_dport);
+ __u16 srcp = ntohs(inet->inet_sport);
- seq_printf(f, "%4d: %08X:%04X %08X:%04X"
+ seq_printf(f, "%5d: %08X:%04X %08X:%04X"
" %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d%n",
bucket, src, srcp, dest, destp, sp->sk_state,
- atomic_read(&sp->sk_wmem_alloc),
- atomic_read(&sp->sk_rmem_alloc),
+ sk_wmem_alloc_get(sp),
+ sk_rmem_alloc_get(sp),
0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
atomic_read(&sp->sk_refcnt), sp,
atomic_read(&sp->sk_drops), len);
int len;
udp4_format_sock(v, seq, state->bucket, &len);
- seq_printf(seq, "%*s\n", 127 - len ,"");
+ seq_printf(seq, "%*s\n", 127 - len, "");
}
return 0;
}
},
};
-static int udp4_proc_init_net(struct net *net)
+static int __net_init udp4_proc_init_net(struct net *net)
{
return udp_proc_register(net, &udp4_seq_afinfo);
}
-static void udp4_proc_exit_net(struct net *net)
+static void __net_exit udp4_proc_exit_net(struct net *net)
{
udp_proc_unregister(net, &udp4_seq_afinfo);
}
}
#endif /* CONFIG_PROC_FS */
-void __init udp_table_init(struct udp_table *table)
+static __initdata unsigned long uhash_entries;
+static int __init set_uhash_entries(char *str)
{
- int i;
+ if (!str)
+ return 0;
+ uhash_entries = simple_strtoul(str, &str, 0);
+ if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN)
+ uhash_entries = UDP_HTABLE_SIZE_MIN;
+ return 1;
+}
+__setup("uhash_entries=", set_uhash_entries);
- for (i = 0; i < UDP_HTABLE_SIZE; i++) {
+void __init udp_table_init(struct udp_table *table, const char *name)
+{
+ unsigned int i;
+
+ if (!CONFIG_BASE_SMALL)
+ table->hash = alloc_large_system_hash(name,
+ 2 * sizeof(struct udp_hslot),
+ uhash_entries,
+ 21, /* one slot per 2 MB */
+ 0,
+ &table->log,
+ &table->mask,
+ 64 * 1024);
+ /*
+ * Make sure hash table has the minimum size
+ */
+ if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) {
+ table->hash = kmalloc(UDP_HTABLE_SIZE_MIN *
+ 2 * sizeof(struct udp_hslot), GFP_KERNEL);
+ if (!table->hash)
+ panic(name);
+ table->log = ilog2(UDP_HTABLE_SIZE_MIN);
+ table->mask = UDP_HTABLE_SIZE_MIN - 1;
+ }
+ table->hash2 = table->hash + (table->mask + 1);
+ for (i = 0; i <= table->mask; i++) {
INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i);
+ 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);
+ table->hash2[i].count = 0;
+ spin_lock_init(&table->hash2[i].lock);
+ }
}
void __init udp_init(void)
{
unsigned long nr_pages, limit;
- udp_table_init(&udp_table);
+ udp_table_init(&udp_table, "UDP");
/* Set the pressure threshold up by the same strategy of TCP. It is a
* fraction of global memory that is up to 1/2 at 256 MB, decreasing
* toward zero with the amount of memory, with a floor of 128 pages.
sysctl_udp_wmem_min = SK_MEM_QUANTUM;
}
-EXPORT_SYMBOL(udp_disconnect);
-EXPORT_SYMBOL(udp_ioctl);
-EXPORT_SYMBOL(udp_prot);
-EXPORT_SYMBOL(udp_sendmsg);
-EXPORT_SYMBOL(udp_lib_getsockopt);
-EXPORT_SYMBOL(udp_lib_setsockopt);
-EXPORT_SYMBOL(udp_poll);
-EXPORT_SYMBOL(udp_lib_get_port);
+int udp4_ufo_send_check(struct sk_buff *skb)
+{
+ const struct iphdr *iph;
+ struct udphdr *uh;
+
+ if (!pskb_may_pull(skb, sizeof(*uh)))
+ return -EINVAL;
+
+ iph = ip_hdr(skb);
+ uh = udp_hdr(skb);
+
+ uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len,
+ IPPROTO_UDP, 0);
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ skb->ip_summed = CHECKSUM_PARTIAL;
+ return 0;
+}
+
+struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, int features)
+{
+ struct sk_buff *segs = ERR_PTR(-EINVAL);
+ unsigned int mss;
+ int offset;
+ __wsum csum;
+
+ mss = skb_shinfo(skb)->gso_size;
+ if (unlikely(skb->len <= mss))
+ goto out;
+
+ if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) {
+ /* Packet is from an untrusted source, reset gso_segs. */
+ int type = skb_shinfo(skb)->gso_type;
+
+ if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) ||
+ !(type & (SKB_GSO_UDP))))
+ goto out;
+
+ skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss);
+
+ segs = NULL;
+ goto out;
+ }
+
+ /* Do software UFO. Complete and fill in the UDP checksum as HW cannot
+ * do checksum of UDP packets sent as multiple IP fragments.
+ */
+ offset = skb->csum_start - skb_headroom(skb);
+ csum = skb_checksum(skb, offset, skb->len - offset, 0);
+ offset += skb->csum_offset;
+ *(__sum16 *)(skb->data + offset) = csum_fold(csum);
+ skb->ip_summed = CHECKSUM_NONE;
+
+ /* Fragment the skb. IP headers of the fragments are updated in
+ * inet_gso_segment()
+ */
+ segs = skb_segment(skb, features);
+out:
+ return segs;
+}
-#ifdef CONFIG_PROC_FS
-EXPORT_SYMBOL(udp_proc_register);
-EXPORT_SYMBOL(udp_proc_unregister);
-#endif