#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.
*/
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
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);
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);
/* 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;
}
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
*/
* 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 */
if ((cscov -= len) <= 0)
break;
}
-#endif
return csum;
}
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"
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
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 \
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);
/* Setup UDP memory threshold */
udp_init();
-#ifdef CONFIG_IP_UDPLITE
/* Add UDP-Lite (RFC 3828) */
udplite4_register();
-#endif
/*
* Set the ICMP layer up
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));
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++)
seq_printf(seq, " %lu",
snmp_fold_field((void **)udplite_statistics,
snmp4_udp_list[i].entry));
-#endif
+
seq_putc(seq, '\n');
return 0;
}
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
*/
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);
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,
+ proto, skb->csum))
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ if (!skb_csum_unnecessary(skb))
+ skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
+ skb->len, proto, 0);
+ /* Probably, we should checksum udp header (it should be in cache
+ * in any case) and data in tiny packets (< rx copybreak).
+ */
+
+ return 0;
+}
+
+/*
+ * All we need to do is get the socket, and then do a checksum.
+ */
+
+int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
+ int proto)
+{
+ struct sock *sk;
+ struct udphdr *uh = udp_hdr(skb);
+ unsigned short ulen;
+ struct rtable *rt = (struct rtable*)skb->dst;
+ __be32 saddr = ip_hdr(skb)->saddr;
+ __be32 daddr = ip_hdr(skb)->daddr;
+
+ /*
+ * Validate the packet.
+ */
+ if (!pskb_may_pull(skb, sizeof(struct udphdr)))
+ goto drop; /* No space for header. */
+
+ ulen = ntohs(uh->len);
+ if (ulen > skb->len)
+ goto short_packet;
+
+ if (proto == IPPROTO_UDP) {
+ /* UDP validates ulen. */
+ if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
+ goto short_packet;
+ uh = udp_hdr(skb);
+ }
+
+ if (udp4_csum_init(skb, uh, proto))
+ goto csum_error;
+
+ if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
+ return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
+
+ sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
+ uh->dest, inet_iif(skb), 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);
+ sock_put(sk);
+
+ /* a return value > 0 means to resubmit the input, but
+ * it wants the return to be -protocol, or 0
+ */
+ if (ret > 0)
+ return -ret;
+ return 0;
+ }
+
+ if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
+ goto drop;
+ nf_reset(skb);
+
+ /* No socket. Drop packet silently, if checksum is wrong */
+ if (udp_lib_checksum_complete(skb))
+ goto csum_error;
+
+ UDP_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
+ icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
+
+ /*
+ * Hmm. We got an UDP packet to a port to which we
+ * don't wanna listen. Ignore it.
+ */
+ kfree_skb(skb);
+ return 0;
+
+short_packet:
+ LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
+ proto == IPPROTO_UDPLITE ? "-Lite" : "",
+ NIPQUAD(saddr),
+ ntohs(uh->source),
+ ulen,
+ skb->len,
+ NIPQUAD(daddr),
+ ntohs(uh->dest));
+ goto drop;
+
+csum_error:
+ /*
+ * RFC1122: OK. Discards the bad packet silently (as far as
+ * the network is concerned, anyway) as per 4.1.3.4 (MUST).
+ */
+ LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
+ proto == IPPROTO_UDPLITE ? "-Lite" : "",
+ NIPQUAD(saddr),
+ ntohs(uh->source),
+ NIPQUAD(daddr),
+ ntohs(uh->dest),
+ ulen);
+drop:
+ UDP_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
+ kfree_skb(skb);
+ return 0;
+}
+
+int udp_rcv(struct sk_buff *skb)
+{
+ return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
+}
+
+int udp_destroy_sock(struct sock *sk)
+{
+ lock_sock(sk);
+ udp_flush_pending_frames(sk);
+ release_sock(sk);
+ return 0;
+}
+
/*
* Socket option code for UDP
*/
struct udp_sock *up = udp_sk(sk);
int val;
int err = 0;
-#ifdef CONFIG_IP_UDPLITE
int is_udplite = IS_UDPLITE(sk);
-#endif
if (optlen<sizeof(int))
return -EINVAL;
}
break;
-#ifdef CONFIG_IP_UDPLITE
/*
* UDP-Lite's partial checksum coverage (RFC 3828).
*/
up->pcrlen = val;
up->pcflag |= UDPLITE_RECV_CC;
break;
-#endif
default:
err = -ENOPROTOOPT;
return err;
}
+int udp_setsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+ udp_push_pending_frames);
+ return ip_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)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_setsockopt(sk, level, optname, optval, optlen,
+ udp_push_pending_frames);
+ return compat_ip_setsockopt(sk, level, optname, optval, optlen);
+}
+#endif
+
int udp_lib_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
return 0;
}
+int udp_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_getsockopt(sk, level, optname, optval, optlen);
+ return ip_getsockopt(sk, level, optname, optval, optlen);
+}
+
+#ifdef CONFIG_COMPAT
+int compat_udp_getsockopt(struct sock *sk, int level, int optname,
+ char __user *optval, int __user *optlen)
+{
+ if (level == SOL_UDP || level == SOL_UDPLITE)
+ return udp_lib_getsockopt(sk, level, optname, optval, optlen);
+ return compat_ip_getsockopt(sk, level, optname, optval, optlen);
+}
+#endif
/**
* udp_poll - wait for a UDP event.
* @file - file struct
}
+DEFINE_PROTO_INUSE(udp)
+
+struct proto udp_prot = {
+ .name = "UDP",
+ .owner = THIS_MODULE,
+ .close = udp_lib_close,
+ .connect = ip4_datagram_connect,
+ .disconnect = udp_disconnect,
+ .ioctl = udp_ioctl,
+ .destroy = udp_destroy_sock,
+ .setsockopt = udp_setsockopt,
+ .getsockopt = udp_getsockopt,
+ .sendmsg = udp_sendmsg,
+ .recvmsg = udp_recvmsg,
+ .sendpage = udp_sendpage,
+ .backlog_rcv = udp_queue_rcv_skb,
+ .hash = udp_lib_hash,
+ .unhash = udp_lib_unhash,
+ .get_port = udp_v4_get_port,
+ .memory_allocated = &udp_memory_allocated,
+ .sysctl_mem = sysctl_udp_mem,
+ .sysctl_wmem = &sysctl_udp_wmem_min,
+ .sysctl_rmem = &sysctl_udp_rmem_min,
+ .obj_size = sizeof(struct udp_sock),
+#ifdef CONFIG_COMPAT
+ .compat_setsockopt = compat_udp_setsockopt,
+ .compat_getsockopt = compat_udp_getsockopt,
+#endif
+ REF_PROTO_INUSE(udp)
+};
/* ------------------------------------------------------------------------ */
#ifdef CONFIG_PROC_FS
proc_net_remove(&init_net, afinfo->name);
memset(afinfo->seq_fops, 0, sizeof(*afinfo->seq_fops));
}
+
+/* ------------------------------------------------------------------------ */
+static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
+{
+ 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);
+
+ sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
+ " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
+ 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);
+}
+
+int udp4_seq_show(struct seq_file *seq, void *v)
+{
+ if (v == SEQ_START_TOKEN)
+ seq_printf(seq, "%-127s\n",
+ " sl local_address rem_address st tx_queue "
+ "rx_queue tr tm->when retrnsmt uid timeout "
+ "inode");
+ else {
+ char tmpbuf[129];
+ struct udp_iter_state *state = seq->private;
+
+ udp4_format_sock(v, tmpbuf, state->bucket);
+ seq_printf(seq, "%-127s\n", tmpbuf);
+ }
+ return 0;
+}
+
+/* ------------------------------------------------------------------------ */
+static struct file_operations udp4_seq_fops;
+static struct udp_seq_afinfo udp4_seq_afinfo = {
+ .owner = THIS_MODULE,
+ .name = "udp",
+ .family = AF_INET,
+ .hashtable = udp_hash,
+ .seq_show = udp4_seq_show,
+ .seq_fops = &udp4_seq_fops,
+};
+
+int __init udp4_proc_init(void)
+{
+ return udp_proc_register(&udp4_seq_afinfo);
+}
+
+void udp4_proc_exit(void)
+{
+ udp_proc_unregister(&udp4_seq_afinfo);
+}
#endif /* CONFIG_PROC_FS */
void __init udp_init(void)
EXPORT_SYMBOL(udp_hash_lock);
EXPORT_SYMBOL(udp_ioctl);
EXPORT_SYMBOL(udp_get_port);
+EXPORT_SYMBOL(udp_prot);
+EXPORT_SYMBOL(udp_sendmsg);
EXPORT_SYMBOL(udp_lib_getsockopt);
EXPORT_SYMBOL(udp_lib_setsockopt);
EXPORT_SYMBOL(udp_poll);
+++ /dev/null
-/*
- * INET An implementation of the TCP/IP protocol suite for the LINUX
- * operating system. INET is implemented using the BSD Socket
- * interface as the means of communication with the user level.
- *
- * UDP for IPv4.
- *
- * For full credits, see net/ipv4/udp.c.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version
- * 2 of the License, or (at your option) any later version.
- */
-
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/ioctls.h>
-#include <linux/bootmem.h>
-#include <linux/types.h>
-#include <linux/fcntl.h>
-#include <linux/module.h>
-#include <linux/socket.h>
-#include <linux/sockios.h>
-#include <linux/igmp.h>
-#include <linux/in.h>
-#include <linux/errno.h>
-#include <linux/timer.h>
-#include <linux/mm.h>
-#include <linux/inet.h>
-#include <linux/netdevice.h>
-#include <net/tcp_states.h>
-#include <linux/skbuff.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include <net/net_namespace.h>
-#include <net/icmp.h>
-#include <net/route.h>
-#include <net/checksum.h>
-#include <net/xfrm.h>
-#include "udp_impl.h"
-
-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;
-}
-
-/*
- * 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;
-}
-
-
-/* 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 (IS_PROTO_UDPLITE(proto)) {
- 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,
- proto, skb->csum))
- skb->ip_summed = CHECKSUM_UNNECESSARY;
- }
- if (!skb_csum_unnecessary(skb))
- skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
- skb->len, proto, 0);
- /* Probably, we should checksum udp header (it should be in cache
- * in any case) and data in tiny packets (< rx copybreak).
- */
-
- return 0;
-}
-
-/*
- * All we need to do is get the socket, and then do a checksum.
- */
-
-int __udp4_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[],
- int proto)
-{
- struct sock *sk;
- struct udphdr *uh = udp_hdr(skb);
- unsigned short ulen;
- struct rtable *rt = skb->rtable;
- __be32 saddr = ip_hdr(skb)->saddr;
- __be32 daddr = ip_hdr(skb)->daddr;
-
- /*
- * Validate the packet.
- */
- if (!pskb_may_pull(skb, sizeof(struct udphdr)))
- goto drop; /* No space for header. */
-
- ulen = ntohs(uh->len);
- if (ulen > skb->len)
- goto short_packet;
-
- if (IS_PROTO_UDPLITE(proto)) {
- /* UDP validates ulen. */
- if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
- goto short_packet;
- uh = udp_hdr(skb);
- }
-
- if (udp4_csum_init(skb, uh, proto))
- goto csum_error;
-
- if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
- return __udp4_lib_mcast_deliver(skb, uh, saddr, daddr, udptable);
-
- sk = __udp4_lib_lookup(skb->dev->nd_net, saddr, uh->source, daddr,
- uh->dest, inet_iif(skb), 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);
- sock_put(sk);
-
- /* a return value > 0 means to resubmit the input, but
- * it wants the return to be -protocol, or 0
- */
- if (ret > 0)
- return -ret;
- return 0;
- }
-
- if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
- goto drop;
- nf_reset(skb);
-
- /* No socket. Drop packet silently, if checksum is wrong */
- if (udp_lib_checksum_complete(skb))
- goto csum_error;
-
- UDP_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
- icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
-
- /*
- * Hmm. We got an UDP packet to a port to which we
- * don't wanna listen. Ignore it.
- */
- kfree_skb(skb);
- return 0;
-
-short_packet:
- LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %u.%u.%u.%u:%u %d/%d to %u.%u.%u.%u:%u\n",
- IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
- NIPQUAD(saddr),
- ntohs(uh->source),
- ulen,
- skb->len,
- NIPQUAD(daddr),
- ntohs(uh->dest));
- goto drop;
-
-csum_error:
- /*
- * RFC1122: OK. Discards the bad packet silently (as far as
- * the network is concerned, anyway) as per 4.1.3.4 (MUST).
- */
- LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %d.%d.%d.%d:%d to %d.%d.%d.%d:%d ulen %d\n",
- IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
- NIPQUAD(saddr),
- ntohs(uh->source),
- NIPQUAD(daddr),
- ntohs(uh->dest),
- ulen);
-drop:
- UDP_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
- kfree_skb(skb);
- return 0;
-}
-
-int udp_rcv(struct sk_buff *skb)
-{
- return __udp4_lib_rcv(skb, udp_hash, IPPROTO_UDP);
-}
-
-int udp_destroy_sock(struct sock *sk)
-{
- lock_sock(sk);
- udp_flush_pending_frames(sk);
- release_sock(sk);
- return 0;
-}
-
-int udp_setsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_setsockopt(sk, level, optname, optval, optlen,
- udp_push_pending_frames);
- return ip_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)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_setsockopt(sk, level, optname, optval, optlen,
- udp_push_pending_frames);
- return compat_ip_setsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
-int udp_getsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_getsockopt(sk, level, optname, optval, optlen);
- return ip_getsockopt(sk, level, optname, optval, optlen);
-}
-
-#ifdef CONFIG_COMPAT
-int compat_udp_getsockopt(struct sock *sk, int level, int optname,
- char __user *optval, int __user *optlen)
-{
- if (IS_SOL_UDPFAMILY(level))
- return udp_lib_getsockopt(sk, level, optname, optval, optlen);
- return compat_ip_getsockopt(sk, level, optname, optval, optlen);
-}
-#endif
-
-/* ------------------------------------------------------------------------ */
-DEFINE_PROTO_INUSE(udp)
-
-struct proto udp_prot = {
- .name = "UDP",
- .owner = THIS_MODULE,
- .close = udp_lib_close,
- .connect = ip4_datagram_connect,
- .disconnect = udp_disconnect,
- .ioctl = udp_ioctl,
- .destroy = udp_destroy_sock,
- .setsockopt = udp_setsockopt,
- .getsockopt = udp_getsockopt,
- .sendmsg = udp_sendmsg,
- .recvmsg = udp_recvmsg,
- .sendpage = udp_sendpage,
- .backlog_rcv = udp_queue_rcv_skb,
- .hash = udp_lib_hash,
- .unhash = udp_lib_unhash,
- .get_port = udp_v4_get_port,
- .memory_allocated = &udp_memory_allocated,
- .sysctl_mem = sysctl_udp_mem,
- .sysctl_wmem = &sysctl_udp_wmem_min,
- .sysctl_rmem = &sysctl_udp_rmem_min,
- .obj_size = sizeof(struct udp_sock),
-#ifdef CONFIG_COMPAT
- .compat_setsockopt = compat_udp_setsockopt,
- .compat_getsockopt = compat_udp_getsockopt,
-#endif
- REF_PROTO_INUSE(udp)
-};
-
-/* ------------------------------------------------------------------------ */
-static void udp4_format_sock(struct sock *sp, char *tmpbuf, int bucket)
-{
- 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);
-
- sprintf(tmpbuf, "%4d: %08X:%04X %08X:%04X"
- " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p",
- 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);
-}
-
-int udp4_seq_show(struct seq_file *seq, void *v)
-{
- if (v == SEQ_START_TOKEN)
- seq_printf(seq, "%-127s\n",
- " sl local_address rem_address st tx_queue "
- "rx_queue tr tm->when retrnsmt uid timeout "
- "inode");
- else {
- char tmpbuf[129];
- struct udp_iter_state *state = seq->private;
-
- udp4_format_sock(v, tmpbuf, state->bucket);
- seq_printf(seq, "%-127s\n", tmpbuf);
- }
- return 0;
-}
-
-/* ------------------------------------------------------------------------ */
-#ifdef CONFIG_PROC_FS
-static struct file_operations udp4_seq_fops;
-static struct udp_seq_afinfo udp4_seq_afinfo = {
- .owner = THIS_MODULE,
- .name = "udp",
- .family = AF_INET,
- .hashtable = udp_hash,
- .seq_show = udp4_seq_show,
- .seq_fops = &udp4_seq_fops,
-};
-
-int __init udp4_proc_init(void)
-{
- return udp_proc_register(&udp4_seq_afinfo);
-}
-
-void udp4_proc_exit(void)
-{
- udp_proc_unregister(&udp4_seq_afinfo);
-}
-#endif /* CONFIG_PROC_FS */
-
-EXPORT_SYMBOL(udp_prot);
-EXPORT_SYMBOL(udp_sendmsg);
-
ipv6-objs := af_inet6.o anycast.o ip6_output.o ip6_input.o addrconf.o \
addrlabel.o \
- route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp_ipv6.o \
+ route.o ip6_fib.o ipv6_sockglue.o ndisc.o udp.o udplite.o \
raw.o protocol.o icmp.o mcast.o reassembly.o tcp_ipv6.o \
exthdrs.o datagram.o ip6_flowlabel.o inet6_connection_sock.o
ipv6-$(CONFIG_IPV6_MULTIPLE_TABLES) += fib6_rules.o
ipv6-$(CONFIG_PROC_FS) += proc.o
ipv6-$(CONFIG_SYN_COOKIES) += syncookies.o
-ipv6-$(CONFIG_IP_UDPLITE) += udplite_ipv6.o
ipv6-objs += $(ipv6-y)
goto err_icmpmsg_mib;
if (snmp_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib)) < 0)
goto err_udp_mib;
-#ifdef CONFIG_IP_UDPLITE
if (snmp_mib_init((void **)udplite_stats_in6,
sizeof (struct udp_mib)) < 0)
goto err_udplite_mib;
-#endif
return 0;
-#ifdef CONFIG_IP_UDPLITE
err_udplite_mib:
-#endif
snmp_mib_free((void **)udp_stats_in6);
err_udp_mib:
snmp_mib_free((void **)icmpv6msg_statistics);
snmp_mib_free((void **)icmpv6_statistics);
snmp_mib_free((void **)icmpv6msg_statistics);
snmp_mib_free((void **)udp_stats_in6);
-#ifdef CONFIG_IP_UDPLITE
snmp_mib_free((void **)udplite_stats_in6);
-#endif
}
static int inet6_net_init(struct net *net)
if (err)
goto out_unregister_tcp_proto;
-#ifdef CONFIG_IP_UDPLITE
err = proto_register(&udplitev6_prot, 1);
if (err)
goto out_unregister_udp_proto;
-#endif
err = proto_register(&rawv6_prot, 1);
if (err)
out_unregister_raw_proto:
proto_unregister(&rawv6_prot);
out_unregister_udplite_proto:
-#ifdef CONFIG_IP_UDPLITE
proto_unregister(&udplitev6_prot);
out_unregister_udp_proto:
-#endif
proto_unregister(&udpv6_prot);
out_unregister_tcp_proto:
proto_unregister(&tcpv6_prot);
ipv6_sysctl_unregister();
#endif
udpv6_exit();
-#ifdef CONFIG_IP_UDPLITE
udplitev6_exit();
-#endif
tcpv6_exit();
/* Cleanup code parts. */
unregister_pernet_subsys(&inet6_net_ops);
cleanup_ipv6_mibs();
proto_unregister(&rawv6_prot);
-#ifdef CONFIG_IP_UDPLITE
proto_unregister(&udplitev6_prot);
-#endif
proto_unregister(&udpv6_prot);
proto_unregister(&tcpv6_prot);
}
struct sk_buff *pktopt;
if (sk->sk_protocol != IPPROTO_UDP &&
-#ifdef CONFIG_IP_UDPLITE
sk->sk_protocol != IPPROTO_UDPLITE &&
-#endif
sk->sk_protocol != IPPROTO_TCP)
break;
} else {
struct proto *prot = &udp_prot;
- if (IS_PROTO_UDPLITE(sk->sk_protocol))
+ if (sk->sk_protocol == IPPROTO_UDPLITE)
prot = &udplite_prot;
local_bh_disable();
sock_prot_inuse_add(sk->sk_prot, -1);
switch (optname) {
case IPV6_ADDRFORM:
if (sk->sk_protocol != IPPROTO_UDP &&
-#ifdef CONFIG_IP_UDPLITE
sk->sk_protocol != IPPROTO_UDPLITE &&
-#endif
sk->sk_protocol != IPPROTO_TCP)
return -EINVAL;
if (sk->sk_state != TCP_ESTABLISHED)
sock_prot_inuse_get(&tcpv6_prot));
seq_printf(seq, "UDP6: inuse %d\n",
sock_prot_inuse_get(&udpv6_prot));
-#ifdef CONFIG_IP_UDPLITE
seq_printf(seq, "UDPLITE6: inuse %d\n",
sock_prot_inuse_get(&udplitev6_prot));
-#endif
seq_printf(seq, "RAW6: inuse %d\n",
sock_prot_inuse_get(&rawv6_prot));
seq_printf(seq, "FRAG6: inuse %d memory %d\n",
SNMP_MIB_SENTINEL
};
-#ifdef CONFIG_IP_UDPLITE
static struct snmp_mib snmp6_udplite6_list[] = {
SNMP_MIB_ITEM("UdpLite6InDatagrams", UDP_MIB_INDATAGRAMS),
SNMP_MIB_ITEM("UdpLite6NoPorts", UDP_MIB_NOPORTS),
SNMP_MIB_ITEM("UdpLite6OutDatagrams", UDP_MIB_OUTDATAGRAMS),
SNMP_MIB_SENTINEL
};
-#endif
static void snmp6_seq_show_icmpv6msg(struct seq_file *seq, void **mib)
{
snmp6_seq_show_item(seq, (void **)icmpv6_statistics, snmp6_icmp6_list);
snmp6_seq_show_icmpv6msg(seq, (void **)icmpv6msg_statistics);
snmp6_seq_show_item(seq, (void **)udp_stats_in6, snmp6_udp6_list);
-#ifdef CONFIG_IP_UDPLITE
snmp6_seq_show_item(seq, (void **)udplite_stats_in6, snmp6_udplite6_list);
-#endif
}
return 0;
}
UDP_SKB_CB(skb)->partial_cov = 0;
UDP_SKB_CB(skb)->cscov = skb->len;
- if (IS_PROTO_UDPLITE(proto)) {
+ if (proto == IPPROTO_UDPLITE) {
err = udplite_checksum_init(skb, uh);
if (err)
return err;
if (udp_lib_checksum_complete(skb))
goto discard;
- UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, IS_PROTO_UDPLITE(proto));
+ UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev);
short_packet:
LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n",
- IS_PROTO_UDPLITE(proto) ? "-Lite" : "",
+ proto == IPPROTO_UDPLITE ? "-Lite" : "",
ulen, skb->len);
discard:
- UDP6_INC_STATS_BH(UDP_MIB_INERRORS, IS_PROTO_UDPLITE(proto));
+ UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
kfree_skb(skb);
return 0;
}
int udpv6_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen)
{
- if (IS_SOL_UDPFAMILY(level))
+ if (level == SOL_UDP || level == SOL_UDPLITE)
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
udp_v6_push_pending_frames);
return ipv6_setsockopt(sk, level, optname, optval, optlen);
int compat_udpv6_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, int optlen)
{
- if (IS_SOL_UDPFAMILY(level))
+ if (level == SOL_UDP || level == SOL_UDPLITE)
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
udp_v6_push_pending_frames);
return compat_ipv6_setsockopt(sk, level, optname, optval, optlen);
int udpv6_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
- if (IS_SOL_UDPFAMILY(level))
+ if (level == SOL_UDP || level == SOL_UDPLITE)
return udp_lib_getsockopt(sk, level, optname, optval, optlen);
return ipv6_getsockopt(sk, level, optname, optval, optlen);
}
int compat_udpv6_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
- if (IS_SOL_UDPFAMILY(level))
+ if (level == SOL_UDP || level == SOL_UDPLITE)
return udp_lib_getsockopt(sk, level, optname, optval, optlen);
return compat_ipv6_getsockopt(sk, level, optname, optval, optlen);
}
projects / linux-2.6 / commitdiff