| /* |
| * UDP over IPv6 |
| * Linux INET6 implementation |
| * |
| * Authors: |
| * Pedro Roque <roque@di.fc.ul.pt> |
| * |
| * Based on linux/ipv4/udp.c |
| * |
| * $Id: udp.c,v 1.65 2002/02/01 22:01:04 davem Exp $ |
| * |
| * Fixes: |
| * Hideaki YOSHIFUJI : sin6_scope_id support |
| * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which |
| * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind |
| * a single port at the same time. |
| * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data |
| * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. |
| * |
| * 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 <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/if_arp.h> |
| #include <linux/ipv6.h> |
| #include <linux/icmpv6.h> |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/skbuff.h> |
| #include <asm/uaccess.h> |
| |
| #include <net/ndisc.h> |
| #include <net/protocol.h> |
| #include <net/transp_v6.h> |
| #include <net/ip6_route.h> |
| #include <net/raw.h> |
| #include <net/tcp_states.h> |
| #include <net/ip6_checksum.h> |
| #include <net/xfrm.h> |
| |
| #include <linux/proc_fs.h> |
| #include <linux/seq_file.h> |
| #include "udp_impl.h" |
| |
| int udp_v6_get_port(struct sock *sk, unsigned short snum) |
| { |
| return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal); |
| } |
| |
| static struct sock *__udp6_lib_lookup(struct net *net, |
| struct in6_addr *saddr, __be16 sport, |
| struct in6_addr *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 (net_eq(sock_net(sk), net) && sk->sk_hash == hnum && |
| sk->sk_family == PF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| int score = 0; |
| if (inet->dport) { |
| if (inet->dport != sport) |
| continue; |
| score++; |
| } |
| if (!ipv6_addr_any(&np->rcv_saddr)) { |
| if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) |
| continue; |
| score++; |
| } |
| if (!ipv6_addr_any(&np->daddr)) { |
| if (!ipv6_addr_equal(&np->daddr, saddr)) |
| continue; |
| score++; |
| } |
| if (sk->sk_bound_dev_if) { |
| if (sk->sk_bound_dev_if != dif) |
| continue; |
| score++; |
| } |
| if (score == 4) { |
| result = sk; |
| break; |
| } else if (score > badness) { |
| result = sk; |
| badness = score; |
| } |
| } |
| } |
| if (result) |
| sock_hold(result); |
| read_unlock(&udp_hash_lock); |
| return result; |
| } |
| |
| /* |
| * This should be easy, if there is something there we |
| * return it, otherwise we block. |
| */ |
| |
| int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
| struct msghdr *msg, size_t len, |
| int noblock, int flags, int *addr_len) |
| { |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| struct sk_buff *skb; |
| unsigned int ulen, copied; |
| int peeked; |
| int err; |
| int is_udplite = IS_UDPLITE(sk); |
| |
| if (addr_len) |
| *addr_len=sizeof(struct sockaddr_in6); |
| |
| if (flags & MSG_ERRQUEUE) |
| return ipv6_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) |
| UDP6_INC_STATS_USER(UDP_MIB_INDATAGRAMS, is_udplite); |
| |
| sock_recv_timestamp(msg, sk, skb); |
| |
| /* Copy the address. */ |
| if (msg->msg_name) { |
| struct sockaddr_in6 *sin6; |
| |
| sin6 = (struct sockaddr_in6 *) msg->msg_name; |
| sin6->sin6_family = AF_INET6; |
| sin6->sin6_port = udp_hdr(skb)->source; |
| sin6->sin6_flowinfo = 0; |
| sin6->sin6_scope_id = 0; |
| |
| if (skb->protocol == htons(ETH_P_IP)) |
| ipv6_addr_set(&sin6->sin6_addr, 0, 0, |
| htonl(0xffff), ip_hdr(skb)->saddr); |
| else { |
| ipv6_addr_copy(&sin6->sin6_addr, |
| &ipv6_hdr(skb)->saddr); |
| if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| sin6->sin6_scope_id = IP6CB(skb)->iif; |
| } |
| |
| } |
| if (skb->protocol == htons(ETH_P_IP)) { |
| if (inet->cmsg_flags) |
| ip_cmsg_recv(msg, skb); |
| } else { |
| if (np->rxopt.all) |
| datagram_recv_ctl(sk, 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)) |
| UDP6_INC_STATS_USER(UDP_MIB_INERRORS, is_udplite); |
| release_sock(sk); |
| |
| if (flags & MSG_DONTWAIT) |
| return -EAGAIN; |
| goto try_again; |
| } |
| |
| void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| int type, int code, int offset, __be32 info, |
| struct hlist_head udptable[] ) |
| { |
| struct ipv6_pinfo *np; |
| struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; |
| struct in6_addr *saddr = &hdr->saddr; |
| struct in6_addr *daddr = &hdr->daddr; |
| struct udphdr *uh = (struct udphdr*)(skb->data+offset); |
| struct sock *sk; |
| int err; |
| |
| sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
| saddr, uh->source, inet6_iif(skb), udptable); |
| if (sk == NULL) |
| return; |
| |
| np = inet6_sk(sk); |
| |
| if (!icmpv6_err_convert(type, code, &err) && !np->recverr) |
| goto out; |
| |
| if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) |
| goto out; |
| |
| if (np->recverr) |
| ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
| |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| out: |
| sock_put(sk); |
| } |
| |
| static __inline__ void udpv6_err(struct sk_buff *skb, |
| struct inet6_skb_parm *opt, int type, |
| int code, int offset, __be32 info ) |
| { |
| __udp6_lib_err(skb, opt, type, code, offset, info, udp_hash); |
| } |
| |
| int udpv6_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); |
| |
| if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
| goto drop; |
| |
| /* |
| * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). |
| */ |
| if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
| |
| if (up->pcrlen == 0) { /* full coverage was set */ |
| LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" |
| " %d while full coverage %d requested\n", |
| UDP_SKB_CB(skb)->cscov, skb->len); |
| goto drop; |
| } |
| if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { |
| LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: 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) |
| UDP6_INC_STATS_BH(UDP_MIB_RCVBUFERRORS, is_udplite); |
| goto drop; |
| } |
| |
| return 0; |
| drop: |
| UDP6_INC_STATS_BH(UDP_MIB_INERRORS, is_udplite); |
| kfree_skb(skb); |
| return -1; |
| } |
| |
| static struct sock *udp_v6_mcast_next(struct sock *sk, |
| __be16 loc_port, struct in6_addr *loc_addr, |
| __be16 rmt_port, struct in6_addr *rmt_addr, |
| int dif) |
| { |
| struct hlist_node *node; |
| struct sock *s = sk; |
| unsigned short num = ntohs(loc_port); |
| |
| sk_for_each_from(s, node) { |
| struct inet_sock *inet = inet_sk(s); |
| |
| if (sock_net(s) != sock_net(sk)) |
| continue; |
| |
| if (s->sk_hash == num && s->sk_family == PF_INET6) { |
| struct ipv6_pinfo *np = inet6_sk(s); |
| if (inet->dport) { |
| if (inet->dport != rmt_port) |
| continue; |
| } |
| if (!ipv6_addr_any(&np->daddr) && |
| !ipv6_addr_equal(&np->daddr, rmt_addr)) |
| continue; |
| |
| if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) |
| continue; |
| |
| if (!ipv6_addr_any(&np->rcv_saddr)) { |
| if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
| continue; |
| } |
| if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
| continue; |
| return s; |
| } |
| } |
| return NULL; |
| } |
| |
| /* |
| * Note: called only from the BH handler context, |
| * so we don't need to lock the hashes. |
| */ |
| static int __udp6_lib_mcast_deliver(struct sk_buff *skb, struct in6_addr *saddr, |
| struct in6_addr *daddr, struct hlist_head udptable[]) |
| { |
| struct sock *sk, *sk2; |
| const struct udphdr *uh = udp_hdr(skb); |
| int dif; |
| |
| read_lock(&udp_hash_lock); |
| sk = sk_head(&udptable[ntohs(uh->dest) & (UDP_HTABLE_SIZE - 1)]); |
| dif = inet6_iif(skb); |
| sk = udp_v6_mcast_next(sk, uh->dest, daddr, uh->source, saddr, dif); |
| if (!sk) { |
| kfree_skb(skb); |
| goto out; |
| } |
| |
| sk2 = sk; |
| while ((sk2 = udp_v6_mcast_next(sk_next(sk2), uh->dest, daddr, |
| uh->source, saddr, dif))) { |
| struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); |
| if (buff) { |
| bh_lock_sock_nested(sk2); |
| if (!sock_owned_by_user(sk2)) |
| udpv6_queue_rcv_skb(sk2, buff); |
| else |
| sk_add_backlog(sk2, buff); |
| bh_unlock_sock(sk2); |
| } |
| } |
| bh_lock_sock_nested(sk); |
| if (!sock_owned_by_user(sk)) |
| udpv6_queue_rcv_skb(sk, skb); |
| else |
| sk_add_backlog(sk, skb); |
| bh_unlock_sock(sk); |
| out: |
| read_unlock(&udp_hash_lock); |
| return 0; |
| } |
| |
| static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
| int proto) |
| { |
| 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; |
| } |
| |
| if (uh->check == 0) { |
| /* RFC 2460 section 8.1 says that we SHOULD log |
| this error. Well, it is reasonable. |
| */ |
| LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); |
| return 1; |
| } |
| if (skb->ip_summed == CHECKSUM_COMPLETE && |
| !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
| skb->len, proto, skb->csum)) |
| skb->ip_summed = CHECKSUM_UNNECESSARY; |
| |
| if (!skb_csum_unnecessary(skb)) |
| skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
| &ipv6_hdr(skb)->daddr, |
| skb->len, proto, 0)); |
| |
| return 0; |
| } |
| |
| int __udp6_lib_rcv(struct sk_buff *skb, struct hlist_head udptable[], |
| int proto) |
| { |
| struct sock *sk; |
| struct udphdr *uh; |
| struct net_device *dev = skb->dev; |
| struct in6_addr *saddr, *daddr; |
| u32 ulen = 0; |
| |
| if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
| goto short_packet; |
| |
| saddr = &ipv6_hdr(skb)->saddr; |
| daddr = &ipv6_hdr(skb)->daddr; |
| uh = udp_hdr(skb); |
| |
| ulen = ntohs(uh->len); |
| if (ulen > skb->len) |
| goto short_packet; |
| |
| if (proto == IPPROTO_UDP) { |
| /* UDP validates ulen. */ |
| |
| /* Check for jumbo payload */ |
| if (ulen == 0) |
| ulen = skb->len; |
| |
| if (ulen < sizeof(*uh)) |
| goto short_packet; |
| |
| if (ulen < skb->len) { |
| if (pskb_trim_rcsum(skb, ulen)) |
| goto short_packet; |
| saddr = &ipv6_hdr(skb)->saddr; |
| daddr = &ipv6_hdr(skb)->daddr; |
| uh = udp_hdr(skb); |
| } |
| } |
| |
| if (udp6_csum_init(skb, uh, proto)) |
| goto discard; |
| |
| /* |
| * Multicast receive code |
| */ |
| if (ipv6_addr_is_multicast(daddr)) |
| return __udp6_lib_mcast_deliver(skb, saddr, daddr, udptable); |
| |
| /* Unicast */ |
| |
| /* |
| * check socket cache ... must talk to Alan about his plans |
| * for sock caches... i'll skip this for now. |
| */ |
| sk = __udp6_lib_lookup(dev_net(skb->dev), saddr, uh->source, |
| daddr, uh->dest, inet6_iif(skb), udptable); |
| |
| if (sk == NULL) { |
| if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
| goto discard; |
| |
| if (udp_lib_checksum_complete(skb)) |
| goto discard; |
| UDP6_INC_STATS_BH(UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
| |
| icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); |
| |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* deliver */ |
| |
| bh_lock_sock_nested(sk); |
| if (!sock_owned_by_user(sk)) |
| udpv6_queue_rcv_skb(sk, skb); |
| else |
| sk_add_backlog(sk, skb); |
| bh_unlock_sock(sk); |
| sock_put(sk); |
| return 0; |
| |
| short_packet: |
| LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", |
| proto == IPPROTO_UDPLITE ? "-Lite" : "", |
| ulen, skb->len); |
| |
| discard: |
| UDP6_INC_STATS_BH(UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| static __inline__ int udpv6_rcv(struct sk_buff *skb) |
| { |
| return __udp6_lib_rcv(skb, udp_hash, IPPROTO_UDP); |
| } |
| |
| /* |
| * Throw away all pending data and cancel the corking. Socket is locked. |
| */ |
| static void udp_v6_flush_pending_frames(struct sock *sk) |
| { |
| struct udp_sock *up = udp_sk(sk); |
| |
| if (up->pending) { |
| up->len = 0; |
| up->pending = 0; |
| ip6_flush_pending_frames(sk); |
| } |
| } |
| |
| /* |
| * Sending |
| */ |
| |
| static int udp_v6_push_pending_frames(struct sock *sk) |
| { |
| struct sk_buff *skb; |
| struct udphdr *uh; |
| struct udp_sock *up = udp_sk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| struct flowi *fl = &inet->cork.fl; |
| 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) |
| csum = udplite_csum_outgoing(sk, skb); |
| else |
| csum = udp_csum_outgoing(sk, skb); |
| |
| /* add protocol-dependent pseudo-header */ |
| uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, |
| up->len, fl->proto, csum ); |
| if (uh->check == 0) |
| uh->check = CSUM_MANGLED_0; |
| |
| err = ip6_push_pending_frames(sk); |
| out: |
| up->len = 0; |
| up->pending = 0; |
| if (!err) |
| UDP6_INC_STATS_USER(UDP_MIB_OUTDATAGRAMS, is_udplite); |
| return err; |
| } |
| |
| int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
| struct msghdr *msg, size_t len) |
| { |
| struct ipv6_txoptions opt_space; |
| struct udp_sock *up = udp_sk(sk); |
| struct inet_sock *inet = inet_sk(sk); |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; |
| struct in6_addr *daddr, *final_p = NULL, final; |
| struct ipv6_txoptions *opt = NULL; |
| struct ip6_flowlabel *flowlabel = NULL; |
| struct flowi fl; |
| struct dst_entry *dst; |
| int addr_len = msg->msg_namelen; |
| int ulen = len; |
| int hlimit = -1; |
| int tclass = -1; |
| int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
| int err; |
| int connected = 0; |
| int is_udplite = IS_UDPLITE(sk); |
| int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
| |
| /* destination address check */ |
| if (sin6) { |
| if (addr_len < offsetof(struct sockaddr, sa_data)) |
| return -EINVAL; |
| |
| switch (sin6->sin6_family) { |
| case AF_INET6: |
| if (addr_len < SIN6_LEN_RFC2133) |
| return -EINVAL; |
| daddr = &sin6->sin6_addr; |
| break; |
| case AF_INET: |
| goto do_udp_sendmsg; |
| case AF_UNSPEC: |
| msg->msg_name = sin6 = NULL; |
| msg->msg_namelen = addr_len = 0; |
| daddr = NULL; |
| break; |
| default: |
| return -EINVAL; |
| } |
| } else if (!up->pending) { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| daddr = &np->daddr; |
| } else |
| daddr = NULL; |
| |
| if (daddr) { |
| if (ipv6_addr_v4mapped(daddr)) { |
| struct sockaddr_in sin; |
| sin.sin_family = AF_INET; |
| sin.sin_port = sin6 ? sin6->sin6_port : inet->dport; |
| sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
| msg->msg_name = &sin; |
| msg->msg_namelen = sizeof(sin); |
| do_udp_sendmsg: |
| if (__ipv6_only_sock(sk)) |
| return -ENETUNREACH; |
| return udp_sendmsg(iocb, sk, msg, len); |
| } |
| } |
| |
| if (up->pending == AF_INET) |
| return udp_sendmsg(iocb, sk, msg, len); |
| |
| /* Rough check on arithmetic overflow, |
| better check is made in ip6_append_data(). |
| */ |
| if (len > INT_MAX - sizeof(struct udphdr)) |
| return -EMSGSIZE; |
| |
| 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_INET6)) { |
| release_sock(sk); |
| return -EAFNOSUPPORT; |
| } |
| dst = NULL; |
| goto do_append_data; |
| } |
| release_sock(sk); |
| } |
| ulen += sizeof(struct udphdr); |
| |
| memset(&fl, 0, sizeof(fl)); |
| |
| if (sin6) { |
| if (sin6->sin6_port == 0) |
| return -EINVAL; |
| |
| fl.fl_ip_dport = sin6->sin6_port; |
| daddr = &sin6->sin6_addr; |
| |
| if (np->sndflow) { |
| fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
| if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { |
| flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| if (flowlabel == NULL) |
| return -EINVAL; |
| daddr = &flowlabel->dst; |
| } |
| } |
| |
| /* |
| * Otherwise it will be difficult to maintain |
| * sk->sk_dst_cache. |
| */ |
| if (sk->sk_state == TCP_ESTABLISHED && |
| ipv6_addr_equal(daddr, &np->daddr)) |
| daddr = &np->daddr; |
| |
| if (addr_len >= sizeof(struct sockaddr_in6) && |
| sin6->sin6_scope_id && |
| ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) |
| fl.oif = sin6->sin6_scope_id; |
| } else { |
| if (sk->sk_state != TCP_ESTABLISHED) |
| return -EDESTADDRREQ; |
| |
| fl.fl_ip_dport = inet->dport; |
| daddr = &np->daddr; |
| fl.fl6_flowlabel = np->flow_label; |
| connected = 1; |
| } |
| |
| if (!fl.oif) |
| fl.oif = sk->sk_bound_dev_if; |
| |
| if (msg->msg_controllen) { |
| opt = &opt_space; |
| memset(opt, 0, sizeof(struct ipv6_txoptions)); |
| opt->tot_len = sizeof(*opt); |
| |
| err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); |
| if (err < 0) { |
| fl6_sock_release(flowlabel); |
| return err; |
| } |
| if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
| flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); |
| if (flowlabel == NULL) |
| return -EINVAL; |
| } |
| if (!(opt->opt_nflen|opt->opt_flen)) |
| opt = NULL; |
| connected = 0; |
| } |
| if (opt == NULL) |
| opt = np->opt; |
| if (flowlabel) |
| opt = fl6_merge_options(&opt_space, flowlabel, opt); |
| opt = ipv6_fixup_options(&opt_space, opt); |
| |
| fl.proto = sk->sk_protocol; |
| if (!ipv6_addr_any(daddr)) |
| ipv6_addr_copy(&fl.fl6_dst, daddr); |
| else |
| fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
| if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) |
| ipv6_addr_copy(&fl.fl6_src, &np->saddr); |
| fl.fl_ip_sport = inet->sport; |
| |
| /* merge ip6_build_xmit from ip6_output */ |
| if (opt && opt->srcrt) { |
| struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; |
| ipv6_addr_copy(&final, &fl.fl6_dst); |
| ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| final_p = &final; |
| connected = 0; |
| } |
| |
| if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { |
| fl.oif = np->mcast_oif; |
| connected = 0; |
| } |
| |
| security_sk_classify_flow(sk, &fl); |
| |
| err = ip6_sk_dst_lookup(sk, &dst, &fl); |
| if (err) |
| goto out; |
| if (final_p) |
| ipv6_addr_copy(&fl.fl6_dst, final_p); |
| |
| if ((err = __xfrm_lookup(&dst, &fl, sk, XFRM_LOOKUP_WAIT)) < 0) { |
| if (err == -EREMOTE) |
| err = ip6_dst_blackhole(sk, &dst, &fl); |
| if (err < 0) |
| goto out; |
| } |
| |
| if (hlimit < 0) { |
| if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
| hlimit = np->mcast_hops; |
| else |
| hlimit = np->hop_limit; |
| if (hlimit < 0) |
| hlimit = ip6_dst_hoplimit(dst); |
| } |
| |
| if (tclass < 0) { |
| tclass = np->tclass; |
| if (tclass < 0) |
| tclass = 0; |
| } |
| |
| if (msg->msg_flags&MSG_CONFIRM) |
| goto do_confirm; |
| back_from_confirm: |
| |
| 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; |
| } |
| |
| up->pending = AF_INET6; |
| |
| do_append_data: |
| up->len += ulen; |
| getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
| err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, |
| sizeof(struct udphdr), hlimit, tclass, opt, &fl, |
| (struct rt6_info*)dst, |
| corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
| if (err) |
| udp_v6_flush_pending_frames(sk); |
| else if (!corkreq) |
| err = udp_v6_push_pending_frames(sk); |
| else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
| up->pending = 0; |
| |
| if (dst) { |
| if (connected) { |
| ip6_dst_store(sk, dst, |
| ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? |
| &np->daddr : NULL, |
| #ifdef CONFIG_IPV6_SUBTREES |
| ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? |
| &np->saddr : |
| #endif |
| NULL); |
| } else { |
| dst_release(dst); |
| } |
| dst = NULL; |
| } |
| |
| if (err > 0) |
| err = np->recverr ? net_xmit_errno(err) : 0; |
| release_sock(sk); |
| out: |
| dst_release(dst); |
| fl6_sock_release(flowlabel); |
| 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)) { |
| UDP6_INC_STATS_USER(UDP_MIB_SNDBUFERRORS, is_udplite); |
| } |
| return err; |
| |
| do_confirm: |
| dst_confirm(dst); |
| if (!(msg->msg_flags&MSG_PROBE) || len) |
| goto back_from_confirm; |
| err = 0; |
| goto out; |
| } |
| |
| int udpv6_destroy_sock(struct sock *sk) |
| { |
| lock_sock(sk); |
| udp_v6_flush_pending_frames(sk); |
| release_sock(sk); |
| |
| inet6_destroy_sock(sk); |
| |
| return 0; |
| } |
| |
| /* |
| * Socket option code for UDP |
| */ |
| int udpv6_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_v6_push_pending_frames); |
| return ipv6_setsockopt(sk, level, optname, optval, optlen); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| int compat_udpv6_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_v6_push_pending_frames); |
| return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
| } |
| #endif |
| |
| int udpv6_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 ipv6_getsockopt(sk, level, optname, optval, optlen); |
| } |
| |
| #ifdef CONFIG_COMPAT |
| int compat_udpv6_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_ipv6_getsockopt(sk, level, optname, optval, optlen); |
| } |
| #endif |
| |
| static struct inet6_protocol udpv6_protocol = { |
| .handler = udpv6_rcv, |
| .err_handler = udpv6_err, |
| .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
| }; |
| |
| /* ------------------------------------------------------------------------ */ |
| #ifdef CONFIG_PROC_FS |
| |
| static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) |
| { |
| struct inet_sock *inet = inet_sk(sp); |
| struct ipv6_pinfo *np = inet6_sk(sp); |
| struct in6_addr *dest, *src; |
| __u16 destp, srcp; |
| |
| dest = &np->daddr; |
| src = &np->rcv_saddr; |
| destp = ntohs(inet->dport); |
| srcp = ntohs(inet->sport); |
| seq_printf(seq, |
| "%4d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
| "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p\n", |
| bucket, |
| src->s6_addr32[0], src->s6_addr32[1], |
| src->s6_addr32[2], src->s6_addr32[3], srcp, |
| dest->s6_addr32[0], dest->s6_addr32[1], |
| dest->s6_addr32[2], dest->s6_addr32[3], 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 udp6_seq_show(struct seq_file *seq, void *v) |
| { |
| if (v == SEQ_START_TOKEN) |
| seq_printf(seq, |
| " sl " |
| "local_address " |
| "remote_address " |
| "st tx_queue rx_queue tr tm->when retrnsmt" |
| " uid timeout inode\n"); |
| else |
| udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); |
| return 0; |
| } |
| |
| static struct udp_seq_afinfo udp6_seq_afinfo = { |
| .name = "udp6", |
| .family = AF_INET6, |
| .hashtable = udp_hash, |
| .seq_fops = { |
| .owner = THIS_MODULE, |
| }, |
| .seq_ops = { |
| .show = udp6_seq_show, |
| }, |
| }; |
| |
| int udp6_proc_init(struct net *net) |
| { |
| return udp_proc_register(net, &udp6_seq_afinfo); |
| } |
| |
| void udp6_proc_exit(struct net *net) { |
| udp_proc_unregister(net, &udp6_seq_afinfo); |
| } |
| #endif /* CONFIG_PROC_FS */ |
| |
| /* ------------------------------------------------------------------------ */ |
| |
| struct proto udpv6_prot = { |
| .name = "UDPv6", |
| .owner = THIS_MODULE, |
| .close = udp_lib_close, |
| .connect = ip6_datagram_connect, |
| .disconnect = udp_disconnect, |
| .ioctl = udp_ioctl, |
| .destroy = udpv6_destroy_sock, |
| .setsockopt = udpv6_setsockopt, |
| .getsockopt = udpv6_getsockopt, |
| .sendmsg = udpv6_sendmsg, |
| .recvmsg = udpv6_recvmsg, |
| .backlog_rcv = udpv6_queue_rcv_skb, |
| .hash = udp_lib_hash, |
| .unhash = udp_lib_unhash, |
| .get_port = udp_v6_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 udp6_sock), |
| .h.udp_hash = udp_hash, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_udpv6_setsockopt, |
| .compat_getsockopt = compat_udpv6_getsockopt, |
| #endif |
| }; |
| |
| static struct inet_protosw udpv6_protosw = { |
| .type = SOCK_DGRAM, |
| .protocol = IPPROTO_UDP, |
| .prot = &udpv6_prot, |
| .ops = &inet6_dgram_ops, |
| .capability =-1, |
| .no_check = UDP_CSUM_DEFAULT, |
| .flags = INET_PROTOSW_PERMANENT, |
| }; |
| |
| |
| int __init udpv6_init(void) |
| { |
| int ret; |
| |
| ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
| if (ret) |
| goto out; |
| |
| ret = inet6_register_protosw(&udpv6_protosw); |
| if (ret) |
| goto out_udpv6_protocol; |
| out: |
| return ret; |
| |
| out_udpv6_protocol: |
| inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| goto out; |
| } |
| |
| void udpv6_exit(void) |
| { |
| inet6_unregister_protosw(&udpv6_protosw); |
| inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); |
| } |