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Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c245
1 files changed, 122 insertions, 123 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 56fcda3694b..2095abc3cab 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -5,12 +5,10 @@
*
* The User Datagram Protocol (UDP).
*
- * Version: $Id: udp.c,v 1.102 2002/02/01 22:01:04 davem Exp $
- *
* Authors: Ross Biro
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
* Arnt Gulbrandsen, <agulbra@nvg.unit.no>
- * Alan Cox, <Alan.Cox@linux.org>
+ * Alan Cox, <alan@lxorguk.ukuu.org.uk>
* Hirokazu Takahashi, <taka@valinux.co.jp>
*
* Fixes:
@@ -110,12 +108,6 @@
* Snmp MIB for the UDP layer
*/
-DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly;
-EXPORT_SYMBOL(udp_statistics);
-
-DEFINE_SNMP_STAT(struct udp_mib, udp_stats_in6) __read_mostly;
-EXPORT_SYMBOL(udp_stats_in6);
-
struct hlist_head udp_hash[UDP_HTABLE_SIZE];
DEFINE_RWLOCK(udp_hash_lock);
@@ -130,14 +122,23 @@ EXPORT_SYMBOL(sysctl_udp_wmem_min);
atomic_t udp_memory_allocated;
EXPORT_SYMBOL(udp_memory_allocated);
-static inline int __udp_lib_lport_inuse(struct net *net, __u16 num,
- const struct hlist_head udptable[])
+static int udp_lib_lport_inuse(struct net *net, __u16 num,
+ const struct hlist_head udptable[],
+ struct sock *sk,
+ int (*saddr_comp)(const struct sock *sk1,
+ const struct sock *sk2))
{
- struct sock *sk;
+ struct sock *sk2;
struct hlist_node *node;
- sk_for_each(sk, node, &udptable[num & (UDP_HTABLE_SIZE - 1)])
- if (net_eq(sock_net(sk), net) && sk->sk_hash == num)
+ sk_for_each(sk2, node, &udptable[udp_hashfn(net, num)])
+ if (net_eq(sock_net(sk2), net) &&
+ sk2 != sk &&
+ 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) &&
+ (*saddr_comp)(sk, sk2))
return 1;
return 0;
}
@@ -154,83 +155,37 @@ int udp_lib_get_port(struct sock *sk, unsigned short snum,
const struct sock *sk2 ) )
{
struct hlist_head *udptable = sk->sk_prot->h.udp_hash;
- struct hlist_node *node;
- struct hlist_head *head;
- struct sock *sk2;
int error = 1;
struct net *net = sock_net(sk);
write_lock_bh(&udp_hash_lock);
if (!snum) {
- int i, low, high, remaining;
- unsigned rover, best, best_size_so_far;
+ int low, high, remaining;
+ unsigned rand;
+ unsigned short first;
inet_get_local_port_range(&low, &high);
remaining = (high - low) + 1;
- best_size_so_far = UINT_MAX;
- best = rover = net_random() % remaining + low;
-
- /* 1st pass: look for empty (or shortest) hash chain */
- for (i = 0; i < UDP_HTABLE_SIZE; i++) {
- int size = 0;
-
- head = &udptable[rover & (UDP_HTABLE_SIZE - 1)];
- if (hlist_empty(head))
- goto gotit;
-
- sk_for_each(sk2, node, head) {
- if (++size >= best_size_so_far)
- goto next;
- }
- best_size_so_far = size;
- best = rover;
- next:
- /* fold back if end of range */
- if (++rover > high)
- rover = low + ((rover - low)
- & (UDP_HTABLE_SIZE - 1));
-
-
- }
-
- /* 2nd pass: find hole in shortest hash chain */
- rover = best;
- for (i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++) {
- if (! __udp_lib_lport_inuse(net, rover, udptable))
- goto gotit;
- rover += UDP_HTABLE_SIZE;
- if (rover > high)
- rover = low + ((rover - low)
- & (UDP_HTABLE_SIZE - 1));
+ rand = net_random();
+ snum = first = rand % remaining + low;
+ rand |= 1;
+ while (udp_lib_lport_inuse(net, snum, udptable, sk,
+ saddr_comp)) {
+ do {
+ snum = snum + rand;
+ } while (snum < low || snum > high);
+ if (snum == first)
+ goto fail;
}
-
-
- /* All ports in use! */
+ } else if (udp_lib_lport_inuse(net, snum, udptable, sk, saddr_comp))
goto fail;
-gotit:
- snum = rover;
- } else {
- head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
-
- sk_for_each(sk2, node, head)
- if (sk2->sk_hash == snum &&
- sk2 != sk &&
- net_eq(sock_net(sk2), net) &&
- (!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) )
- goto fail;
- }
-
inet_sk(sk)->num = snum;
sk->sk_hash = snum;
if (sk_unhashed(sk)) {
- head = &udptable[snum & (UDP_HTABLE_SIZE - 1)];
- sk_add_node(sk, head);
+ sk_add_node(sk, &udptable[udp_hashfn(net, snum)]);
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
}
error = 0;
@@ -266,7 +221,7 @@ static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
int badness = -1;
read_lock(&udp_hash_lock);
- sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
+ sk_for_each(sk, node, &udptable[udp_hashfn(net, hnum)]) {
struct inet_sock *inet = inet_sk(sk);
if (net_eq(sock_net(sk), net) && sk->sk_hash == hnum &&
@@ -307,6 +262,28 @@ static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
return result;
}
+static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
+ __be16 sport, __be16 dport,
+ struct hlist_head udptable[])
+{
+ struct sock *sk;
+ const struct iphdr *iph = ip_hdr(skb);
+
+ if (unlikely(sk = skb_steal_sock(skb)))
+ return sk;
+ else
+ return __udp4_lib_lookup(dev_net(skb->dst->dev), iph->saddr, sport,
+ iph->daddr, dport, inet_iif(skb),
+ udptable);
+}
+
+struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
+ __be32 daddr, __be16 dport, int dif)
+{
+ return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, udp_hash);
+}
+EXPORT_SYMBOL_GPL(udp4_lib_lookup);
+
static inline struct sock *udp_v4_mcast_next(struct sock *sk,
__be16 loc_port, __be32 loc_addr,
__be16 rmt_port, __be32 rmt_addr,
@@ -356,11 +333,12 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
struct sock *sk;
int harderr;
int err;
+ struct net *net = dev_net(skb->dev);
- sk = __udp4_lib_lookup(dev_net(skb->dev), iph->daddr, uh->dest,
+ sk = __udp4_lib_lookup(net, iph->daddr, uh->dest,
iph->saddr, uh->source, skb->dev->ifindex, udptable);
if (sk == NULL) {
- ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
+ ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
return; /* No socket for error */
}
@@ -528,7 +506,8 @@ out:
up->len = 0;
up->pending = 0;
if (!err)
- UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
+ UDP_INC_STATS_USER(sock_net(sk),
+ UDP_MIB_OUTDATAGRAMS, is_udplite);
return err;
}
@@ -656,11 +635,13 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
.uli_u = { .ports =
{ .sport = inet->sport,
.dport = dport } } };
+ struct net *net = sock_net(sk);
+
security_sk_classify_flow(sk, &fl);
- err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 1);
+ err = ip_route_output_flow(net, &rt, &fl, sk, 1);
if (err) {
if (err == -ENETUNREACH)
- IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
+ IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES);
goto out;
}
@@ -727,7 +708,8 @@ out:
* seems like overkill.
*/
if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
- UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
+ UDP_INC_STATS_USER(sock_net(sk),
+ UDP_MIB_SNDBUFERRORS, is_udplite);
}
return err;
@@ -890,7 +872,8 @@ try_again:
goto out_free;
if (!peeked)
- UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
+ UDP_INC_STATS_USER(sock_net(sk),
+ UDP_MIB_INDATAGRAMS, is_udplite);
sock_recv_timestamp(msg, sk, skb);
@@ -919,7 +902,7 @@ out:
csum_copy_err:
lock_sock(sk);
if (!skb_kill_datagram(sk, skb, flags))
- UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
+ UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
release_sock(sk);
if (noblock)
@@ -950,6 +933,27 @@ int udp_disconnect(struct sock *sk, int flags)
return 0;
}
+static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
+{
+ int is_udplite = IS_UDPLITE(sk);
+ int rc;
+
+ if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) {
+ /* Note that an ENOMEM error is charged twice */
+ if (rc == -ENOMEM)
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
+ is_udplite);
+ goto drop;
+ }
+
+ return 0;
+
+drop:
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
+ kfree_skb(skb);
+ return -1;
+}
+
/* returns:
* -1: error
* 0: success
@@ -990,7 +994,8 @@ int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
ret = (*up->encap_rcv)(sk, skb);
if (ret <= 0) {
- UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
+ UDP_INC_STATS_BH(sock_net(sk),
+ UDP_MIB_INDATAGRAMS,
is_udplite);
return -ret;
}
@@ -1040,17 +1045,19 @@ int udp_queue_rcv_skb(struct sock * sk, struct sk_buff *skb)
goto drop;
}
- if ((rc = sock_queue_rcv_skb(sk,skb)) < 0) {
- /* Note that an ENOMEM error is charged twice */
- if (rc == -ENOMEM)
- UDP_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite);
- goto drop;
- }
+ rc = 0;
- return 0;
+ bh_lock_sock(sk);
+ if (!sock_owned_by_user(sk))
+ rc = __udp_queue_rcv_skb(sk, skb);
+ else
+ sk_add_backlog(sk, skb);
+ bh_unlock_sock(sk);
+
+ return rc;
drop:
- UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
+ UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
kfree_skb(skb);
return -1;
}
@@ -1061,7 +1068,7 @@ drop:
* Note: called only from the BH handler context,
* so we don't need to lock the hashes.
*/
-static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
+static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
struct udphdr *uh,
__be32 saddr, __be32 daddr,
struct hlist_head udptable[])
@@ -1070,7 +1077,7 @@ static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
int dif;
read_lock(&udp_hash_lock);
- sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
+ sk = sk_head(&udptable[udp_hashfn(net, ntohs(uh->dest))]);
dif = skb->dev->ifindex;
sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
if (sk) {
@@ -1085,15 +1092,7 @@ static int __udp4_lib_mcast_deliver(struct sk_buff *skb,
skb1 = skb_clone(skb, GFP_ATOMIC);
if (skb1) {
- int ret = 0;
-
- bh_lock_sock_nested(sk);
- if (!sock_owned_by_user(sk))
- ret = udp_queue_rcv_skb(sk, skb1);
- else
- sk_add_backlog(sk, skb1);
- bh_unlock_sock(sk);
-
+ int ret = udp_queue_rcv_skb(sk, skb1);
if (ret > 0)
/* we should probably re-process instead
* of dropping packets here. */
@@ -1158,6 +1157,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
struct rtable *rt = (struct rtable*)skb->dst;
__be32 saddr = ip_hdr(skb)->saddr;
__be32 daddr = ip_hdr(skb)->daddr;
+ struct net *net = dev_net(skb->dev);
/*
* Validate the packet.
@@ -1180,19 +1180,13 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
goto csum_error;
if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
- return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
+ return __udp4_lib_mcast_deliver(net, skb, uh,
+ saddr, daddr, udptable);
- sk = __udp4_lib_lookup(dev_net(skb->dev), saddr, uh->source, daddr,
- uh->dest, inet_iif(skb), udptable);
+ sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
if (sk != NULL) {
- int ret = 0;
- bh_lock_sock_nested(sk);
- if (!sock_owned_by_user(sk))
- ret = udp_queue_rcv_skb(sk, skb);
- else
- sk_add_backlog(sk, skb);
- bh_unlock_sock(sk);
+ int ret = udp_queue_rcv_skb(sk, skb);
sock_put(sk);
/* a return value > 0 means to resubmit the input, but
@@ -1211,7 +1205,7 @@ int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
if (udp_lib_checksum_complete(skb))
goto csum_error;
- UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
+ UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
/*
@@ -1245,7 +1239,7 @@ csum_error:
ntohs(uh->dest),
ulen);
drop:
- UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
+ UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
kfree_skb(skb);
return 0;
}
@@ -1255,12 +1249,11 @@ int udp_rcv(struct sk_buff *skb)
return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
}
-int udp_destroy_sock(struct sock *sk)
+void udp_destroy_sock(struct sock *sk)
{
lock_sock(sk);
udp_flush_pending_frames(sk);
release_sock(sk);
- return 0;
}
/*
@@ -1319,6 +1312,8 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
return -ENOPROTOOPT;
if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
val = 8;
+ else if (val > USHORT_MAX)
+ val = USHORT_MAX;
up->pcslen = val;
up->pcflag |= UDPLITE_SEND_CC;
break;
@@ -1331,6 +1326,8 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
return -ENOPROTOOPT;
if (val != 0 && val < 8) /* Avoid silly minimal values. */
val = 8;
+ else if (val > USHORT_MAX)
+ val = USHORT_MAX;
up->pcrlen = val;
up->pcflag |= UDPLITE_RECV_CC;
break;
@@ -1453,7 +1450,8 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
spin_lock_bh(&rcvq->lock);
while ((skb = skb_peek(rcvq)) != NULL &&
udp_lib_checksum_complete(skb)) {
- UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_lite);
+ UDP_INC_STATS_BH(sock_net(sk),
+ UDP_MIB_INERRORS, is_lite);
__skb_unlink(skb, rcvq);
kfree_skb(skb);
}
@@ -1481,7 +1479,7 @@ struct proto udp_prot = {
.sendmsg = udp_sendmsg,
.recvmsg = udp_recvmsg,
.sendpage = udp_sendpage,
- .backlog_rcv = udp_queue_rcv_skb,
+ .backlog_rcv = __udp_queue_rcv_skb,
.hash = udp_lib_hash,
.unhash = udp_lib_unhash,
.get_port = udp_v4_get_port,
@@ -1629,12 +1627,13 @@ static void udp4_format_sock(struct sock *sp, struct seq_file *f,
__u16 srcp = ntohs(inet->sport);
seq_printf(f, "%4d: %08X:%04X %08X:%04X"
- " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p%n",
+ " %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),
0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp),
- atomic_read(&sp->sk_refcnt), sp, len);
+ atomic_read(&sp->sk_refcnt), sp,
+ atomic_read(&sp->sk_drops), len);
}
int udp4_seq_show(struct seq_file *seq, void *v)
@@ -1643,7 +1642,7 @@ int udp4_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, "%-127s\n",
" sl local_address rem_address st tx_queue "
"rx_queue tr tm->when retrnsmt uid timeout "
- "inode");
+ "inode ref pointer drops");
else {
struct udp_iter_state *state = seq->private;
int len;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 00:08:34 +0000