diff options
Diffstat (limited to 'net/ipv4/udp_ipv4.c')
| -rw-r--r-- | net/ipv4/udp_ipv4.c | 1134 |
1 files changed, 0 insertions, 1134 deletions
diff --git a/net/ipv4/udp_ipv4.c b/net/ipv4/udp_ipv4.c deleted file mode 100644 index fd14c2c50ed4..000000000000 --- a/net/ipv4/udp_ipv4.c +++ /dev/null @@ -1,1134 +0,0 @@ -/* - * 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); - |