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Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r--net/ipv4/udp.c156
1 files changed, 111 insertions, 45 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 80e3812837ad..ebaaa7f973d7 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -110,11 +110,12 @@ struct udp_table udp_table;
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;
@@ -158,7 +159,7 @@ static int udp_lib_lport_inuse(struct net *net, __u16 num,
*/
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))
{
struct udp_hslot *hslot;
struct udp_table *udptable = sk->sk_prot->h.udp_table;
@@ -221,14 +222,15 @@ 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->rcv_saddr || !inet2->rcv_saddr ||
+ inet1->rcv_saddr == inet2->rcv_saddr));
}
int udp_v4_get_port(struct sock *sk, unsigned short snum)
@@ -383,8 +385,8 @@ found:
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;
@@ -439,7 +441,7 @@ void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
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);
@@ -474,7 +476,7 @@ EXPORT_SYMBOL(udp_flush_pending_frames);
* (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);
@@ -545,7 +547,7 @@ static int udp_push_pending_frames(struct sock *sk)
} 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 */
@@ -553,18 +555,24 @@ static int udp_push_pending_frames(struct sock *sk)
/* 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;
}
@@ -592,7 +600,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
* 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;
@@ -619,7 +627,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
* 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) {
@@ -684,7 +692,7 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
}
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,
@@ -782,6 +790,7 @@ do_confirm:
err = 0;
goto out;
}
+EXPORT_SYMBOL(udp_sendmsg);
int udp_sendpage(struct sock *sk, struct page *page, int offset,
size_t size, int flags)
@@ -871,6 +880,7 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
return 0;
}
+EXPORT_SYMBOL(udp_ioctl);
/*
* This should be easy, if there is something there we
@@ -892,7 +902,7 @@ int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
* 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);
@@ -923,9 +933,11 @@ try_again:
if (skb_csum_unnecessary(skb))
err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
- msg->msg_iov, copied );
+ msg->msg_iov, copied);
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;
@@ -941,8 +953,7 @@ try_again:
sock_recv_timestamp(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;
@@ -995,6 +1006,7 @@ int udp_disconnect(struct sock *sk, int flags)
sk_dst_reset(sk);
return 0;
}
+EXPORT_SYMBOL(udp_disconnect);
void udp_lib_unhash(struct sock *sk)
{
@@ -1044,7 +1056,7 @@ drop:
* 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;
@@ -1214,7 +1226,7 @@ static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
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;
}
@@ -1355,7 +1367,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
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))
@@ -1426,6 +1438,7 @@ int udp_lib_setsockopt(struct sock *sk, int level, int optname,
return err;
}
+EXPORT_SYMBOL(udp_lib_setsockopt);
int udp_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen)
@@ -1453,7 +1466,7 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
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));
@@ -1486,10 +1499,11 @@ int udp_lib_getsockopt(struct sock *sk, int level, int optname,
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)
@@ -1528,9 +1542,9 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
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)){
+ 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;
@@ -1552,6 +1566,7 @@ unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
return mask;
}
+EXPORT_SYMBOL(udp_poll);
struct proto udp_prot = {
.name = "UDP",
@@ -1582,6 +1597,7 @@ struct proto udp_prot = {
.compat_getsockopt = compat_udp_getsockopt,
#endif
};
+EXPORT_SYMBOL(udp_prot);
/* ------------------------------------------------------------------------ */
#ifdef CONFIG_PROC_FS
@@ -1703,11 +1719,13 @@ int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
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,
@@ -1741,7 +1759,7 @@ int udp4_seq_show(struct seq_file *seq, void *v)
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;
}
@@ -1816,16 +1834,64 @@ void __init udp_init(void)
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
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.