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-rw-r--r--include/linux/udp.h10
-rw-r--r--include/net/ipv6.h5
-rw-r--r--include/net/transp_v6.h5
-rw-r--r--include/net/udplite.h9
-rw-r--r--net/ipv4/Kconfig10
-rw-r--r--net/ipv4/Makefile3
-rw-r--r--net/ipv4/af_inet.c7
-rw-r--r--net/ipv4/proc.c5
-rw-r--r--net/ipv4/udp.c1090
-rw-r--r--net/ipv4/udp_ipv4.c1134
-rw-r--r--net/ipv4/udplite.c (renamed from net/ipv4/udplite_ipv4.c)0
-rw-r--r--net/ipv6/Makefile3
-rw-r--r--net/ipv6/af_inet6.c14
-rw-r--r--net/ipv6/ipv6_sockglue.c6
-rw-r--r--net/ipv6/proc.c6
-rw-r--r--net/ipv6/udp.c (renamed from net/ipv6/udp_ipv6.c)16
-rw-r--r--net/ipv6/udplite.c (renamed from net/ipv6/udplite_ipv6.c)0
17 files changed, 1101 insertions, 1222 deletions
diff --git a/include/linux/udp.h b/include/linux/udp.h
index 4144664d69d9..1e7b7cb5703b 100644
--- a/include/linux/udp.h
+++ b/include/linux/udp.h
@@ -70,10 +70,8 @@ struct udp_sock {
#define UDPLITE_BIT 0x1 /* set by udplite proto init function */
#define UDPLITE_SEND_CC 0x2 /* set via udplite setsockopt */
#define UDPLITE_RECV_CC 0x4 /* set via udplite setsocktopt */
-#ifdef CONFIG_IP_UDPLITE
__u8 pcflag; /* marks socket as UDP-Lite if > 0 */
__u8 unused[3];
-#endif
/*
* For encapsulation sockets.
*/
@@ -85,15 +83,7 @@ static inline struct udp_sock *udp_sk(const struct sock *sk)
return (struct udp_sock *)sk;
}
-#ifdef CONFIG_IP_UDPLITE
#define IS_UDPLITE(__sk) (udp_sk(__sk)->pcflag)
-#define IS_PROTO_UDPLITE(__proto) ((__proto) == IPPROTO_UDPLITE)
-#define IS_SOL_UDPFAMILY(level) ((level) == SOL_UDP || (level) == SOL_UDPLITE)
-#else
-#define IS_UDPLITE(__sk) 0
-#define IS_PROTO_UDPLITE(__proto) 0
-#define IS_SOL_UDPFAMILY(level) ((level) == SOL_UDP)
-#endif
#endif
diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 5f6df50a33a9..8db06af1efbb 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -599,13 +599,8 @@ extern int tcp6_proc_init(void);
extern void tcp6_proc_exit(void);
extern int udp6_proc_init(void);
extern void udp6_proc_exit(void);
-#ifdef CONFIG_IP_UDPLITE
extern int udplite6_proc_init(void);
extern void udplite6_proc_exit(void);
-#else
-static inline int udplite6_proc_init(void) { return 0; }
-static inline void udplite6_proc_exit(void) { }
-#endif
extern int ipv6_misc_proc_init(void);
extern void ipv6_misc_proc_exit(void);
extern int snmp6_register_dev(struct inet6_dev *idev);
diff --git a/include/net/transp_v6.h b/include/net/transp_v6.h
index 902e6c6bc793..27394e0447d8 100644
--- a/include/net/transp_v6.h
+++ b/include/net/transp_v6.h
@@ -27,13 +27,8 @@ extern int rawv6_init(void);
extern void rawv6_exit(void);
extern int udpv6_init(void);
extern void udpv6_exit(void);
-#ifdef CONFIG_IP_UDPLITE
extern int udplitev6_init(void);
extern void udplitev6_exit(void);
-#else
-static inline int udplitev6_init(void) { return 0; }
-static inline void udplitev6_exit(void) { }
-#endif
extern int tcpv6_init(void);
extern void tcpv6_exit(void);
diff --git a/include/net/udplite.h b/include/net/udplite.h
index 01ddb2c20264..b76b2e377af4 100644
--- a/include/net/udplite.h
+++ b/include/net/udplite.h
@@ -25,9 +25,7 @@ static __inline__ int udplite_getfrag(void *from, char *to, int offset,
/* Designate sk as UDP-Lite socket */
static inline int udplite_sk_init(struct sock *sk)
{
-#ifdef CONFIG_IP_UDPLITE
udp_sk(sk)->pcflag = UDPLITE_BIT;
-#endif
return 0;
}
@@ -71,7 +69,7 @@ static inline int udplite_checksum_init(struct sk_buff *skb, struct udphdr *uh)
static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh)
{
int cscov = up->len;
-#ifdef CONFIG_IP_UDPLITE
+
/*
* Sender has set `partial coverage' option on UDP-Lite socket
*/
@@ -95,15 +93,13 @@ static inline int udplite_sender_cscov(struct udp_sock *up, struct udphdr *uh)
* illegal, we fall back to the defaults here.
*/
}
-#endif
return cscov;
}
static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
{
- __wsum csum = 0;
-#ifdef CONFIG_IP_UDPLITE
int cscov = udplite_sender_cscov(udp_sk(sk), udp_hdr(skb));
+ __wsum csum = 0;
skb->ip_summed = CHECKSUM_NONE; /* no HW support for checksumming */
@@ -116,7 +112,6 @@ static inline __wsum udplite_csum_outgoing(struct sock *sk, struct sk_buff *skb)
if ((cscov -= len) <= 0)
break;
}
-#endif
return csum;
}
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 5098fd2ff4d0..9c7e5ffb223d 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -632,15 +632,5 @@ config TCP_MD5SIG
If unsure, say N.
-config IP_UDPLITE
- bool "IP: UDP-Lite Protocol (RFC 3828)"
- default n
- ---help---
- UDP-Lite (RFC 3828) is a UDP-like protocol with variable-length
- checksum. Read <file:Documentation/networking/udplite.txt> for
- details.
-
- If unsure, say N.
-
source "net/ipv4/ipvs/Kconfig"
diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
index d5226241d5ed..ad40ef3f9ebc 100644
--- a/net/ipv4/Makefile
+++ b/net/ipv4/Makefile
@@ -8,7 +8,7 @@ obj-y := route.o inetpeer.o protocol.o \
inet_timewait_sock.o inet_connection_sock.o \
tcp.o tcp_input.o tcp_output.o tcp_timer.o tcp_ipv4.o \
tcp_minisocks.o tcp_cong.o \
- datagram.o raw.o udp.o udp_ipv4.o \
+ datagram.o raw.o udp.o udplite.o \
arp.o icmp.o devinet.o af_inet.o igmp.o \
fib_frontend.o fib_semantics.o \
inet_fragment.o
@@ -49,7 +49,6 @@ obj-$(CONFIG_TCP_CONG_SCALABLE) += tcp_scalable.o
obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
-obj-$(CONFIG_IP_UDPLITE) += udplite_ipv4.o
obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index 25871c6c7444..4cb8a1385539 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1317,18 +1317,15 @@ static int __init init_ipv4_mibs(void)
if (snmp_mib_init((void **)udp_statistics,
sizeof(struct udp_mib)) < 0)
goto err_udp_mib;
-#ifdef CONFIG_IP_UDPLITE
if (snmp_mib_init((void **)udplite_statistics,
sizeof(struct udp_mib)) < 0)
goto err_udplite_mib;
-#endif
+
tcp_mib_init();
return 0;
-#ifdef CONFIG_IP_UDPLITE
err_udplite_mib:
-#endif
snmp_mib_free((void **)udp_statistics);
err_udp_mib:
snmp_mib_free((void **)tcp_statistics);
@@ -1426,10 +1423,8 @@ static int __init inet_init(void)
/* Setup UDP memory threshold */
udp_init();
-#ifdef CONFIG_IP_UDPLITE
/* Add UDP-Lite (RFC 3828) */
udplite4_register();
-#endif
/*
* Set the ICMP layer up
diff --git a/net/ipv4/proc.c b/net/ipv4/proc.c
index d75ddb7fa4b8..d63474c6b400 100644
--- a/net/ipv4/proc.c
+++ b/net/ipv4/proc.c
@@ -59,9 +59,7 @@ static int sockstat_seq_show(struct seq_file *seq, void *v)
atomic_read(&tcp_memory_allocated));
seq_printf(seq, "UDP: inuse %d mem %d\n", sock_prot_inuse_get(&udp_prot),
atomic_read(&udp_memory_allocated));
-#ifdef CONFIG_IP_UDPLITE
seq_printf(seq, "UDPLITE: inuse %d\n", sock_prot_inuse_get(&udplite_prot));
-#endif
seq_printf(seq, "RAW: inuse %d\n", sock_prot_inuse_get(&raw_prot));
seq_printf(seq, "FRAG: inuse %d memory %d\n",
ip_frag_nqueues(&init_net), ip_frag_mem(&init_net));
@@ -351,7 +349,6 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
snmp_fold_field((void **)udp_statistics,
snmp4_udp_list[i].entry));
-#ifdef CONFIG_IP_UDPLITE
/* the UDP and UDP-Lite MIBs are the same */
seq_puts(seq, "\nUdpLite:");
for (i = 0; snmp4_udp_list[i].name != NULL; i++)
@@ -362,7 +359,7 @@ static int snmp_seq_show(struct seq_file *seq, void *v)
seq_printf(seq, " %lu",
snmp_fold_field((void **)udplite_statistics,
snmp4_udp_list[i].entry));
-#endif
+
seq_putc(seq, '\n');
return 0;
}
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index c53d7673b57d..7ea1b67b6de1 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -246,6 +246,553 @@ int udp_get_port(struct sock *sk, unsigned short snum,
return __udp_lib_get_port(sk, snum, udp_hash, scmp);
}
+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 ));
+}
+
+static inline int udp_v4_get_port(struct sock *sk, unsigned short snum)
+{
+ return udp_get_port(sk, snum, ipv4_rcv_saddr_equal);
+}
+
+/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
+ * harder than this. -DaveM
+ */
+static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
+ __be16 sport, __be32 daddr, __be16 dport,
+ int dif, struct hlist_head udptable[])
+{
+ struct sock *sk, *result = NULL;
+ struct hlist_node *node;
+ unsigned short hnum = ntohs(dport);
+ int badness = -1;
+
+ read_lock(&udp_hash_lock);
+ sk_for_each(sk, node, &udptable[hnum & (UDP_HTABLE_SIZE - 1)]) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (sk->sk_net == net && sk->sk_hash == hnum &&
+ !ipv6_only_sock(sk)) {
+ int score = (sk->sk_family == PF_INET ? 1 : 0);
+ if (inet->rcv_saddr) {
+ if (inet->rcv_saddr != daddr)
+ continue;
+ score+=2;
+ }
+ if (inet->daddr) {
+ if (inet->daddr != saddr)
+ continue;
+ score+=2;
+ }
+ if (inet->dport) {
+ if (inet->dport != sport)
+ continue;
+ score+=2;
+ }
+ if (sk->sk_bound_dev_if) {
+ if (sk->sk_bound_dev_if != dif)
+ continue;
+ score+=2;
+ }
+ if (score == 9) {
+ result = sk;
+ break;
+ } else if (score > badness) {
+ result = sk;
+ badness = score;
+ }
+ }
+ }
+ if (result)
+ sock_hold(result);
+ read_unlock(&udp_hash_lock);
+ return result;
+}
+
+static inline struct sock *udp_v4_mcast_next(struct sock *sk,
+ __be16 loc_port, __be32 loc_addr,
+ __be16 rmt_port, __be32 rmt_addr,
+ int dif)
+{
+ struct hlist_node *node;
+ struct sock *s = sk;
+ unsigned short hnum = ntohs(loc_port);
+
+ sk_for_each_from(s, node) {
+ struct inet_sock *inet = inet_sk(s);
+
+ if (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) ||
+ (s->sk_bound_dev_if && s->sk_bound_dev_if != dif))
+ continue;
+ if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif))
+ continue;
+ goto found;
+ }
+ s = NULL;
+found:
+ return s;
+}
+
+/*
+ * This routine is called by the ICMP module when it gets some
+ * sort of error condition. If err < 0 then the socket should
+ * be closed and the error returned to the user. If err > 0
+ * it's just the icmp type << 8 | icmp code.
+ * Header points to the ip header of the error packet. We move
+ * on past this. Then (as it used to claim before adjustment)
+ * header points to the first 8 bytes of the udp header. We need
+ * to find the appropriate port.
+ */
+
+void __udp4_lib_err(struct sk_buff *skb, u32 info, struct hlist_head udptable[])
+{
+ struct inet_sock *inet;
+ 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;
+ int harderr;
+ int err;
+
+ sk = __udp4_lib_lookup(skb->dev->nd_net, iph->daddr, uh->dest,
+ iph->saddr, uh->source, skb->dev->ifindex, udptable);
+ if (sk == NULL) {
+ ICMP_INC_STATS_BH(ICMP_MIB_INERRORS);
+ return; /* No socket for error */
+ }
+
+ err = 0;
+ harderr = 0;
+ inet = inet_sk(sk);
+
+ switch (type) {
+ default:
+ case ICMP_TIME_EXCEEDED:
+ err = EHOSTUNREACH;
+ break;
+ case ICMP_SOURCE_QUENCH:
+ goto out;
+ case ICMP_PARAMETERPROB:
+ err = EPROTO;
+ harderr = 1;
+ break;
+ case ICMP_DEST_UNREACH:
+ if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
+ if (inet->pmtudisc != IP_PMTUDISC_DONT) {
+ err = EMSGSIZE;
+ harderr = 1;
+ break;
+ }
+ goto out;
+ }
+ err = EHOSTUNREACH;
+ if (code <= NR_ICMP_UNREACH) {
+ harderr = icmp_err_convert[code].fatal;
+ err = icmp_err_convert[code].errno;
+ }
+ break;
+ }
+
+ /*
+ * RFC1122: OK. Passes ICMP errors back to application, as per
+ * 4.1.3.3.
+ */
+ if (!inet->recverr) {
+ if (!harderr || sk->sk_state != TCP_ESTABLISHED)
+ goto out;
+ } else {
+ ip_icmp_error(sk, skb, err, uh->dest, info, (u8*)(uh+1));
+ }
+ sk->sk_err = err;
+ sk->sk_error_report(sk);
+out:
+ sock_put(sk);
+}
+
+void udp_err(struct sk_buff *skb, u32 info)
+{
+ __udp4_lib_err(skb, info, udp_hash);
+}
+
+/*
+ * Throw away all pending data and cancel the corking. Socket is locked.
+ */
+static void udp_flush_pending_frames(struct sock *sk)
+{
+ struct udp_sock *up = udp_sk(sk);
+
+ if (up->pending) {
+ up->len = 0;
+ up->pending = 0;
+ ip_flush_pending_frames(sk);
+ }
+}
+
+/**
+ * udp4_hwcsum_outgoing - handle outgoing HW checksumming
+ * @sk: socket we are sending on
+ * @skb: sk_buff containing the filled-in UDP header
+ * (checksum field must be zeroed out)
+ */
+static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb,
+ __be32 src, __be32 dst, int len )
+{
+ unsigned int offset;
+ struct udphdr *uh = udp_hdr(skb);
+ __wsum csum = 0;
+
+ if (skb_queue_len(&sk->sk_write_queue) == 1) {
+ /*
+ * Only one fragment on the socket.
+ */
+ skb->csum_start = skb_transport_header(skb) - skb->head;
+ skb->csum_offset = offsetof(struct udphdr, check);
+ uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0);
+ } else {
+ /*
+ * HW-checksum won't work as there are two or more
+ * fragments on the socket so that all csums of sk_buffs
+ * should be together
+ */
+ offset = skb_transport_offset(skb);
+ skb->csum = skb_checksum(skb, offset, skb->len - offset, 0);
+
+ skb->ip_summed = CHECKSUM_NONE;
+
+ skb_queue_walk(&sk->sk_write_queue, skb) {
+ csum = csum_add(csum, skb->csum);
+ }
+
+ uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+ }
+}
+
+/*
+ * Push out all pending data as one UDP datagram. Socket is locked.
+ */
+static int udp_push_pending_frames(struct sock *sk)
+{
+ struct udp_sock *up = udp_sk(sk);
+ struct inet_sock *inet = inet_sk(sk);
+ struct flowi *fl = &inet->cork.fl;
+ struct sk_buff *skb;
+ struct udphdr *uh;
+ int err = 0;
+ int is_udplite = IS_UDPLITE(sk);
+ __wsum csum = 0;
+
+ /* Grab the skbuff where UDP header space exists. */
+ if ((skb = skb_peek(&sk->sk_write_queue)) == NULL)
+ goto out;
+
+ /*
+ * Create a UDP header
+ */
+ uh = udp_hdr(skb);
+ uh->source = fl->fl_ip_sport;
+ uh->dest = fl->fl_ip_dport;
+ uh->len = htons(up->len);
+ uh->check = 0;
+
+ if (is_udplite) /* UDP-Lite */
+ csum = udplite_csum_outgoing(sk, skb);
+
+ else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */
+
+ skb->ip_summed = CHECKSUM_NONE;
+ goto send;
+
+ } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
+
+ udp4_hwcsum_outgoing(sk, skb, fl->fl4_src,fl->fl4_dst, up->len);
+ goto send;
+
+ } else /* `normal' UDP */
+ csum = udp_csum_outgoing(sk, skb);
+
+ /* add protocol-dependent pseudo-header */
+ uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len,
+ sk->sk_protocol, csum );
+ if (uh->check == 0)
+ uh->check = CSUM_MANGLED_0;
+
+send:
+ err = ip_push_pending_frames(sk);
+out:
+ up->len = 0;
+ up->pending = 0;
+ if (!err)
+ UDP_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite);
+ return err;
+}
+
+int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+ size_t len)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct udp_sock *up = udp_sk(sk);
+ int ulen = len;
+ struct ipcm_cookie ipc;
+ struct rtable *rt = NULL;
+ int free = 0;
+ int connected = 0;
+ __be32 daddr, faddr, saddr;
+ __be16 dport;
+ u8 tos;
+ int err, is_udplite = IS_UDPLITE(sk);
+ int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
+ int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
+
+ if (len > 0xFFFF)
+ return -EMSGSIZE;
+
+ /*
+ * Check the flags.
+ */
+
+ if (msg->msg_flags&MSG_OOB) /* Mirror BSD error message compatibility */
+ return -EOPNOTSUPP;
+
+ ipc.opt = NULL;
+
+ if (up->pending) {
+ /*
+ * There are pending frames.
+ * The socket lock must be held while it's corked.
+ */
+ lock_sock(sk);
+ if (likely(up->pending)) {
+ if (unlikely(up->pending != AF_INET)) {
+ release_sock(sk);
+ return -EINVAL;
+ }
+ goto do_append_data;
+ }
+ release_sock(sk);
+ }
+ ulen += sizeof(struct udphdr);
+
+ /*
+ * Get and verify the address.
+ */
+ if (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) {
+ if (usin->sin_family != AF_UNSPEC)
+ return -EAFNOSUPPORT;
+ }
+
+ daddr = usin->sin_addr.s_addr;
+ dport = usin->sin_port;
+ if (dport == 0)
+ return -EINVAL;
+ } else {
+ if (sk->sk_state != TCP_ESTABLISHED)
+ return -EDESTADDRREQ;
+ daddr = inet->daddr;
+ dport = 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.oif = sk->sk_bound_dev_if;
+ if (msg->msg_controllen) {
+ err = ip_cmsg_send(msg, &ipc);
+ if (err)
+ return err;
+ if (ipc.opt)
+ free = 1;
+ connected = 0;
+ }
+ if (!ipc.opt)
+ ipc.opt = inet->opt;
+
+ saddr = ipc.addr;
+ ipc.addr = faddr = daddr;
+
+ if (ipc.opt && ipc.opt->srr) {
+ if (!daddr)
+ return -EINVAL;
+ faddr = ipc.opt->faddr;
+ connected = 0;
+ }
+ tos = RT_TOS(inet->tos);
+ if (sock_flag(sk, SOCK_LOCALROUTE) ||
+ (msg->msg_flags & MSG_DONTROUTE) ||
+ (ipc.opt && ipc.opt->is_strictroute)) {
+ tos |= RTO_ONLINK;
+ connected = 0;
+ }
+
+ if (ipv4_is_multicast(daddr)) {
+ if (!ipc.oif)
+ ipc.oif = inet->mc_index;
+ if (!saddr)
+ saddr = inet->mc_addr;
+ connected = 0;
+ }
+
+ if (connected)
+ rt = (struct rtable*)sk_dst_check(sk, 0);
+
+ if (rt == NULL) {
+ struct flowi fl = { .oif = ipc.oif,
+ .nl_u = { .ip4_u =
+ { .daddr = faddr,
+ .saddr = saddr,
+ .tos = tos } },
+ .proto = sk->sk_protocol,
+ .uli_u = { .ports =
+ { .sport = inet->sport,
+ .dport = dport } } };
+ security_sk_classify_flow(sk, &fl);
+ err = ip_route_output_flow(&init_net, &rt, &fl, sk, 1);
+ if (err) {
+ if (err == -ENETUNREACH)
+ IP_INC_STATS_BH(IPSTATS_MIB_OUTNOROUTES);
+ goto out;
+ }
+
+ err = -EACCES;
+ if ((rt->rt_flags & RTCF_BROADCAST) &&
+ !sock_flag(sk, SOCK_BROADCAST))
+ goto out;
+ if (connected)
+ sk_dst_set(sk, dst_clone(&rt->u.dst));
+ }
+
+ if (msg->msg_flags&MSG_CONFIRM)
+ goto do_confirm;
+back_from_confirm:
+
+ saddr = rt->rt_src;
+ if (!ipc.addr)
+ daddr = ipc.addr = rt->rt_dst;
+
+ lock_sock(sk);
+ if (unlikely(up->pending)) {
+ /* The socket is already corked while preparing it. */
+ /* ... which is an evident application bug. --ANK */
+ release_sock(sk);
+
+ LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n");
+ err = -EINVAL;
+ goto out;
+ }
+ /*
+ * Now cork the socket to pend data.
+ */
+ 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;
+ up->pending = AF_INET;
+
+do_append_data:
+ up->len += ulen;
+ getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
+ err = ip_append_data(sk, getfrag, msg->msg_iov, ulen,
+ sizeof(struct udphdr), &ipc, rt,
+ corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
+ if (err)
+ udp_flush_pending_frames(sk);
+ else if (!corkreq)
+ err = udp_push_pending_frames(sk);
+ else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
+ up->pending = 0;
+ release_sock(sk);
+
+out:
+ ip_rt_put(rt);
+ if (free)
+ kfree(ipc.opt);
+ if (!err)
+ return len;
+ /*
+ * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
+ * ENOBUFS might not be good (it's not tunable per se), but otherwise
+ * we don't have a good statistic (IpOutDiscards but it can be too many
+ * things). We could add another new stat but at least for now that
+ * seems like overkill.
+ */
+ if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
+ UDP_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite);
+ }
+ return err;
+
+do_confirm:
+ dst_confirm(&rt->u.dst);
+ if (!(msg->msg_flags&MSG_PROBE) || len)
+ goto back_from_confirm;
+ err = 0;
+ goto out;
+}
+
+int udp_sendpage(struct sock *sk, struct page *page, int offset,
+ size_t size, int flags)
+{
+ struct udp_sock *up = udp_sk(sk);
+ int ret;
+
+ if (!up->pending) {
+ struct msghdr msg = { .msg_flags = flags|MSG_MORE };
+
+ /* Call udp_sendmsg to specify destination address which
+ * sendpage interface can't pass.
+ * This will succeed only when the socket is connected.
+ */
+ ret = udp_sendmsg(NULL, sk, &msg, 0);
+ if (ret < 0)
+ return ret;
+ }
+
+ lock_sock(sk);
+
+ if (unlikely(!up->pending)) {
+ release_sock(sk);
+
+ LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n");
+ return -EINVAL;
+ }
+
+ ret = ip_append_page(sk, page, offset, size, flags);
+ if (ret == -EOPNOTSUPP) {
+ release_sock(sk);
+ return sock_no_sendpage(sk->sk_socket, page, offset,
+ size, flags);
+ }
+ if (ret < 0) {
+ udp_flush_pending_frames(sk);
+ goto out;
+ }
+
+ up->len += size;
+ if (!(up->corkflag || (flags&MSG_MORE)))
+ ret = udp_push_pending_frames(sk);
+ if (!ret)
+ ret = size;
+out:
+ release_sock(sk);
+ return ret;
+}
+
/*
* IOCTL requests applicable to the UDP protocol
*/
@@ -286,6 +833,107 @@ int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
return 0;
}
+/*
+ * This should be easy, if there is something there we
+ * return it, otherwise we block.
+ */
+
+int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
+ size_t len, int noblock, int flags, int *addr_len)
+{
+ 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;
+ int peeked;
+ int err;
+ int is_udplite = IS_UDPLITE(sk);
+
+ /*
+ * Check any passed addresses
+ */
+ if (addr_len)
+ *addr_len=sizeof(*sin);
+
+ if (flags & MSG_ERRQUEUE)
+ return ip_recv_error(sk, msg, len);
+
+try_again:
+ skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
+ &peeked, &err);
+ if (!skb)
+ goto out;
+
+ ulen = skb->len - sizeof(struct udphdr);
+ copied = len;
+ if (copied > ulen)
+ copied = ulen;
+ else if (copied < ulen)
+ msg->msg_flags |= MSG_TRUNC;
+
+ /*
+ * If checksum is needed at all, try to do it while copying the
+ * data. If the data is truncated, or if we only want a partial
+ * coverage checksum (UDP-Lite), do it before the copy.
+ */
+
+ if (copied < 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 );
+ else {
+ err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov);
+
+ if (err == -EINVAL)
+ goto csum_copy_err;
+ }
+
+ if (err)
+ goto out_free;
+
+ if (!peeked)
+ UDP_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite);
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ /* Copy the address. */
+ if (sin)
+ {
+ sin->sin_family = AF_INET;
+ sin->sin_port = udp_hdr(skb)->source;
+ sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
+ memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
+ }
+ if (inet->cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+
+ err = copied;
+ if (flags & MSG_TRUNC)
+ err = ulen;
+
+out_free:
+ lock_sock(sk);
+ skb_free_datagram(sk, skb);
+ release_sock(sk);
+out:
+ return err;
+
+csum_copy_err:
+ lock_sock(sk);
+ if (!skb_kill_datagram(sk, skb, flags))
+ UDP_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite);
+ release_sock(sk);
+
+ if (noblock)
+ return -EAGAIN;
+ goto try_again;
+}
+
+
int udp_disconnect(struct sock *sk, int flags)
{
struct inet_sock *inet = inet_sk(sk);
@@ -308,6 +956,319 @@ int udp_disconnect(struct sock *sk, int flags)
return 0;
}
+/* returns:
+ * -1: error
+ * 0: success
+ * >0: "udp encap" protocol resubmission
+ *
+ * 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)
+{
+ struct udp_sock *up = udp_sk(sk);
+ int rc;
+ int is_udplite = IS_UDPLITE(sk);
+
+ /*
+ * Charge it to the socket, dropping if the queue is full.
+ */
+ if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
+ goto drop;
+ nf_reset(skb);
+
+ if (up->encap_type) {
+ /*
+ * This is an encapsulation socket so pass the skb to
+ * the socket's udp_encap_rcv() hook. Otherwise, just
+ * fall through and pass this up the UDP socket.
+ * up->encap_rcv() returns the following value:
+ * =0 if skb was successfully passed to the encap
+ * handler or was discarded by it.
+ * >0 if skb should be passed on to UDP.
+ * <0 if skb should be resubmitted as proto -N
+ */
+
+ /* if we're overly short, let UDP handle it */
+ if (skb->len > sizeof(struct udphdr) &&
+ up->encap_rcv != NULL) {
+ int ret;
+
+ ret = (*up->encap_rcv)(sk, skb);
+ if (ret <= 0) {
+ UDP_INC_STATS_BH(UDP_MIB_INDATAGRAMS,
+ is_udplite);
+ return -ret;
+ }
+ }
+
+ /* FALLTHROUGH -- it's a UDP Packet */
+ }
+
+ /*
+ * UDP-Lite specific tests, ignored on UDP sockets
+ */
+ if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
+
+ /*
+ * MIB statistics other than incrementing the error count are
+ * disabled for the following two types of errors: these depend
+ * on the application settings, not on the functioning of the
+ * protocol stack as such.
+ *
+ * RFC 3828 here recommends (sec 3.3): "There should also be a
+ * way ... to ... at least let the receiving application block
+ * delivery of packets with coverage values less than a value
+ * provided by the application."
+ */
+ if (up->pcrlen == 0) { /* full coverage was set */
+ LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage "
+ "%d while full coverage %d requested\n",
+ UDP_SKB_CB(skb)->cscov, skb->len);
+ goto drop;
+ }
+ /* The next case involves violating the min. coverage requested
+ * by the receiver. This is subtle: if receiver wants x and x is
+ * greater than the buffersize/MTU then receiver will complain
+ * that it wants x while sender emits packets of smaller size y.
+ * Therefore the above ...()->partial_cov statement is essential.
+ */
+ if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
+ LIMIT_NETDEBUG(KERN_WARNING
+ "UDPLITE: coverage %d too small, need min %d\n",
+ UDP_SKB_CB(skb)->cscov, up->pcrlen);
+ goto drop;
+ }
+ }
+
+ if (sk->sk_filter) {
+ if (udp_lib_checksum_complete(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;
+ }
+
+ return 0;
+
+drop:
+ UDP_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite);
+ kfree_skb(skb);
+ return -1;
+}
+
+/*
+ * Multicasts and broadcasts go to each listener.
+ *
+ * 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,
+ struct udphdr *uh,
+ __be32 saddr, __be32 daddr,
+ struct hlist_head udptable[])
+{
+ struct sock *sk;
+ int dif;
+
+ read_lock(&udp_hash_lock);
+ sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]);
+ dif = skb->dev->ifindex;
+ sk = udp_v4_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif);
+ if (sk) {
+ struct sock *sknext = NULL;
+
+ do {
+ struct sk_buff *skb1 = skb;
+
+ sknext = udp_v4_mcast_next(sk_next(sk), uh->dest, daddr,
+ uh->source, saddr, dif);
+ if (sknext)
+ 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);
+
+ if (ret > 0)
+ /* we should probably re-process instead
+ * of dropping packets here. */
+ kfree_skb(skb1);
+ }
+ sk = sknext;
+ } while (sknext);
+ } else
+ kfree_skb(skb);
+ read_unlock(&udp_hash_lock);
+ return 0;
+}
+
+/* Initialize UDP checksum. If exited with zero value (success),
+ * CHECKSUM_UNNECESSARY means, that no more checks are required.
+ * Otherwise, csum completion requires chacksumming packet body,
+ * including udp header and folding it to skb->csum.
+ */
+static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
+ int proto)
+{
+ const struct iphdr *iph;
+ int err;
+
+ UDP_SKB_CB(skb)->partial_cov = 0;
+ UDP_SKB_CB(skb)->cscov = skb->len;
+
+ if (proto == IPPROTO_UDPLITE) {
+ err = udplite_checksum_init(skb, uh);
+ if (err)
+ return err;
+ }
+
+ iph = ip_hdr(skb);
+ 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,
+