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Diffstat (limited to 'net/ipv6/datagram.c')
-rw-r--r--net/ipv6/datagram.c600
1 files changed, 600 insertions, 0 deletions
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c
new file mode 100644
index 000000000000..65b9375df57d
--- /dev/null
+++ b/net/ipv6/datagram.c
@@ -0,0 +1,600 @@
+/*
+ * common UDP/RAW code
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
+ *
+ * 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/kernel.h>
+#include <linux/sched.h>
+#include <linux/interrupt.h>
+#include <linux/socket.h>
+#include <linux/sockios.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+#include <linux/route.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/addrconf.h>
+#include <net/transp_v6.h>
+#include <net/ip6_route.h>
+
+#include <linux/errqueue.h>
+#include <asm/uaccess.h>
+
+int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct in6_addr *daddr, *final_p = NULL, final;
+ struct dst_entry *dst;
+ struct flowi fl;
+ struct ip6_flowlabel *flowlabel = NULL;
+ int addr_type;
+ int err;
+
+ if (usin->sin6_family == AF_INET) {
+ if (__ipv6_only_sock(sk))
+ return -EAFNOSUPPORT;
+ err = ip4_datagram_connect(sk, uaddr, addr_len);
+ goto ipv4_connected;
+ }
+
+ if (addr_len < SIN6_LEN_RFC2133)
+ return -EINVAL;
+
+ if (usin->sin6_family != AF_INET6)
+ return -EAFNOSUPPORT;
+
+ memset(&fl, 0, sizeof(fl));
+ if (np->sndflow) {
+ fl.fl6_flowlabel = usin->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;
+ ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
+ }
+ }
+
+ addr_type = ipv6_addr_type(&usin->sin6_addr);
+
+ if (addr_type == IPV6_ADDR_ANY) {
+ /*
+ * connect to self
+ */
+ usin->sin6_addr.s6_addr[15] = 0x01;
+ }
+
+ daddr = &usin->sin6_addr;
+
+ if (addr_type == IPV6_ADDR_MAPPED) {
+ struct sockaddr_in sin;
+
+ if (__ipv6_only_sock(sk)) {
+ err = -ENETUNREACH;
+ goto out;
+ }
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = daddr->s6_addr32[3];
+ sin.sin_port = usin->sin6_port;
+
+ err = ip4_datagram_connect(sk,
+ (struct sockaddr*) &sin,
+ sizeof(sin));
+
+ipv4_connected:
+ if (err)
+ goto out;
+
+ ipv6_addr_set(&np->daddr, 0, 0, htonl(0x0000ffff), inet->daddr);
+
+ if (ipv6_addr_any(&np->saddr)) {
+ ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000ffff),
+ inet->saddr);
+ }
+
+ if (ipv6_addr_any(&np->rcv_saddr)) {
+ ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000ffff),
+ inet->rcv_saddr);
+ }
+ goto out;
+ }
+
+ if (addr_type&IPV6_ADDR_LINKLOCAL) {
+ if (addr_len >= sizeof(struct sockaddr_in6) &&
+ usin->sin6_scope_id) {
+ if (sk->sk_bound_dev_if &&
+ sk->sk_bound_dev_if != usin->sin6_scope_id) {
+ err = -EINVAL;
+ goto out;
+ }
+ sk->sk_bound_dev_if = usin->sin6_scope_id;
+ if (!sk->sk_bound_dev_if &&
+ (addr_type & IPV6_ADDR_MULTICAST))
+ fl.oif = np->mcast_oif;
+ }
+
+ /* Connect to link-local address requires an interface */
+ if (!sk->sk_bound_dev_if) {
+ err = -EINVAL;
+ goto out;
+ }
+ }
+
+ ipv6_addr_copy(&np->daddr, daddr);
+ np->flow_label = fl.fl6_flowlabel;
+
+ inet->dport = usin->sin6_port;
+
+ /*
+ * Check for a route to destination an obtain the
+ * destination cache for it.
+ */
+
+ fl.proto = sk->sk_protocol;
+ ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
+ ipv6_addr_copy(&fl.fl6_src, &np->saddr);
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fl_ip_dport = inet->dport;
+ fl.fl_ip_sport = inet->sport;
+
+ if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
+ fl.oif = np->mcast_oif;
+
+ if (flowlabel) {
+ if (flowlabel->opt && flowlabel->opt->srcrt) {
+ struct rt0_hdr *rt0 = (struct rt0_hdr *) flowlabel->opt->srcrt;
+ ipv6_addr_copy(&final, &fl.fl6_dst);
+ ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+ final_p = &final;
+ }
+ } else if (np->opt && np->opt->srcrt) {
+ struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
+ ipv6_addr_copy(&final, &fl.fl6_dst);
+ ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+ final_p = &final;
+ }
+
+ err = ip6_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, 0)) < 0) {
+ dst_release(dst);
+ goto out;
+ }
+
+ /* source address lookup done in ip6_dst_lookup */
+
+ if (ipv6_addr_any(&np->saddr))
+ ipv6_addr_copy(&np->saddr, &fl.fl6_src);
+
+ if (ipv6_addr_any(&np->rcv_saddr)) {
+ ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
+ inet->rcv_saddr = LOOPBACK4_IPV6;
+ }
+
+ ip6_dst_store(sk, dst,
+ ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
+ &np->daddr : NULL);
+
+ sk->sk_state = TCP_ESTABLISHED;
+out:
+ fl6_sock_release(flowlabel);
+ return err;
+}
+
+void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
+ u16 port, u32 info, u8 *payload)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
+ struct sock_exterr_skb *serr;
+
+ if (!np->recverr)
+ return;
+
+ skb = skb_clone(skb, GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ serr = SKB_EXT_ERR(skb);
+ serr->ee.ee_errno = err;
+ serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
+ serr->ee.ee_type = icmph->icmp6_type;
+ serr->ee.ee_code = icmph->icmp6_code;
+ serr->ee.ee_pad = 0;
+ serr->ee.ee_info = info;
+ serr->ee.ee_data = 0;
+ serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
+ serr->port = port;
+
+ skb->h.raw = payload;
+ __skb_pull(skb, payload - skb->data);
+
+ if (sock_queue_err_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sock_exterr_skb *serr;
+ struct ipv6hdr *iph;
+ struct sk_buff *skb;
+
+ if (!np->recverr)
+ return;
+
+ skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
+ if (!skb)
+ return;
+
+ iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
+ skb->nh.ipv6h = iph;
+ ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
+
+ serr = SKB_EXT_ERR(skb);
+ serr->ee.ee_errno = err;
+ serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
+ serr->ee.ee_type = 0;
+ serr->ee.ee_code = 0;
+ serr->ee.ee_pad = 0;
+ serr->ee.ee_info = info;
+ serr->ee.ee_data = 0;
+ serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
+ serr->port = fl->fl_ip_dport;
+
+ skb->h.raw = skb->tail;
+ __skb_pull(skb, skb->tail - skb->data);
+
+ if (sock_queue_err_skb(sk, skb))
+ kfree_skb(skb);
+}
+
+/*
+ * Handle MSG_ERRQUEUE
+ */
+int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct sock_exterr_skb *serr;
+ struct sk_buff *skb, *skb2;
+ struct sockaddr_in6 *sin;
+ struct {
+ struct sock_extended_err ee;
+ struct sockaddr_in6 offender;
+ } errhdr;
+ int err;
+ int copied;
+
+ err = -EAGAIN;
+ skb = skb_dequeue(&sk->sk_error_queue);
+ if (skb == NULL)
+ goto out;
+
+ copied = skb->len;
+ if (copied > len) {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ if (err)
+ goto out_free_skb;
+
+ sock_recv_timestamp(msg, sk, skb);
+
+ serr = SKB_EXT_ERR(skb);
+
+ sin = (struct sockaddr_in6 *)msg->msg_name;
+ if (sin) {
+ sin->sin6_family = AF_INET6;
+ sin->sin6_flowinfo = 0;
+ sin->sin6_port = serr->port;
+ sin->sin6_scope_id = 0;
+ if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
+ ipv6_addr_copy(&sin->sin6_addr,
+ (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
+ if (np->sndflow)
+ sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
+ if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin->sin6_scope_id = IP6CB(skb)->iif;
+ } else {
+ ipv6_addr_set(&sin->sin6_addr, 0, 0,
+ htonl(0xffff),
+ *(u32*)(skb->nh.raw + serr->addr_offset));
+ }
+ }
+
+ memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
+ sin = &errhdr.offender;
+ sin->sin6_family = AF_UNSPEC;
+ if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
+ sin->sin6_family = AF_INET6;
+ sin->sin6_flowinfo = 0;
+ sin->sin6_scope_id = 0;
+ if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
+ ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
+ if (np->rxopt.all)
+ datagram_recv_ctl(sk, msg, skb);
+ if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin->sin6_scope_id = IP6CB(skb)->iif;
+ } else {
+ struct inet_sock *inet = inet_sk(sk);
+
+ ipv6_addr_set(&sin->sin6_addr, 0, 0,
+ htonl(0xffff),
+ skb->nh.iph->saddr);
+ if (inet->cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+ }
+ }
+
+ put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
+
+ /* Now we could try to dump offended packet options */
+
+ msg->msg_flags |= MSG_ERRQUEUE;
+ err = copied;
+
+ /* Reset and regenerate socket error */
+ spin_lock_irq(&sk->sk_error_queue.lock);
+ sk->sk_err = 0;
+ if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
+ sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
+ spin_unlock_irq(&sk->sk_error_queue.lock);
+ sk->sk_error_report(sk);
+ } else {
+ spin_unlock_irq(&sk->sk_error_queue.lock);
+ }
+
+out_free_skb:
+ kfree_skb(skb);
+out:
+ return err;
+}
+
+
+
+int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct inet6_skb_parm *opt = IP6CB(skb);
+
+ if (np->rxopt.bits.rxinfo) {
+ struct in6_pktinfo src_info;
+
+ src_info.ipi6_ifindex = opt->iif;
+ ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
+ put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
+ }
+
+ if (np->rxopt.bits.rxhlim) {
+ int hlim = skb->nh.ipv6h->hop_limit;
+ put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
+ }
+
+ if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
+ u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
+ put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
+ }
+ if (np->rxopt.bits.hopopts && opt->hop) {
+ u8 *ptr = skb->nh.raw + opt->hop;
+ put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
+ }
+ if (np->rxopt.bits.dstopts && opt->dst0) {
+ u8 *ptr = skb->nh.raw + opt->dst0;
+ put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
+ }
+ if (np->rxopt.bits.srcrt && opt->srcrt) {
+ struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
+ put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
+ }
+ if (np->rxopt.bits.dstopts && opt->dst1) {
+ u8 *ptr = skb->nh.raw + opt->dst1;
+ put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
+ }
+ return 0;
+}
+
+int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
+ struct ipv6_txoptions *opt,
+ int *hlimit)
+{
+ struct in6_pktinfo *src_info;
+ struct cmsghdr *cmsg;
+ struct ipv6_rt_hdr *rthdr;
+ struct ipv6_opt_hdr *hdr;
+ int len;
+ int err = 0;
+
+ for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
+ int addr_type;
+ struct net_device *dev = NULL;
+
+ if (!CMSG_OK(msg, cmsg)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ if (cmsg->cmsg_level != SOL_IPV6)
+ continue;
+
+ switch (cmsg->cmsg_type) {
+ case IPV6_PKTINFO:
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
+
+ if (src_info->ipi6_ifindex) {
+ if (fl->oif && src_info->ipi6_ifindex != fl->oif)
+ return -EINVAL;
+ fl->oif = src_info->ipi6_ifindex;
+ }
+
+ addr_type = ipv6_addr_type(&src_info->ipi6_addr);
+
+ if (addr_type == IPV6_ADDR_ANY)
+ break;
+
+ if (addr_type & IPV6_ADDR_LINKLOCAL) {
+ if (!src_info->ipi6_ifindex)
+ return -EINVAL;
+ else {
+ dev = dev_get_by_index(src_info->ipi6_ifindex);
+ if (!dev)
+ return -ENODEV;
+ }
+ }
+ if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
+ if (dev)
+ dev_put(dev);
+ err = -EINVAL;
+ goto exit_f;
+ }
+ if (dev)
+ dev_put(dev);
+
+ ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
+ break;
+
+ case IPV6_FLOWINFO:
+ if (cmsg->cmsg_len < CMSG_LEN(4)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
+ if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ }
+ fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
+ break;
+
+ case IPV6_HOPOPTS:
+ if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
+ len = ((hdr->hdrlen + 1) << 3);
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ if (!capable(CAP_NET_RAW)) {
+ err = -EPERM;
+ goto exit_f;
+ }
+ opt->opt_nflen += len;
+ opt->hopopt = hdr;
+ break;
+
+ case IPV6_DSTOPTS:
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
+ len = ((hdr->hdrlen + 1) << 3);
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ if (!capable(CAP_NET_RAW)) {
+ err = -EPERM;
+ goto exit_f;
+ }
+ if (opt->dst1opt) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+ opt->opt_flen += len;
+ opt->dst1opt = hdr;
+ break;
+
+ case IPV6_RTHDR:
+ if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
+
+ /*
+ * TYPE 0
+ */
+ if (rthdr->type) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ len = ((rthdr->hdrlen + 1) << 3);
+
+ if (cmsg->cmsg_len < CMSG_LEN(len)) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ /* segments left must also match */
+ if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ opt->opt_nflen += len;
+ opt->srcrt = rthdr;
+
+ if (opt->dst1opt) {
+ int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
+
+ opt->opt_nflen += dsthdrlen;
+ opt->dst0opt = opt->dst1opt;
+ opt->dst1opt = NULL;
+ opt->opt_flen -= dsthdrlen;
+ }
+
+ break;
+
+ case IPV6_HOPLIMIT:
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
+ err = -EINVAL;
+ goto exit_f;
+ }
+
+ *hlimit = *(int *)CMSG_DATA(cmsg);
+ break;
+
+ default:
+ LIMIT_NETDEBUG(
+ printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type));
+ err = -EINVAL;
+ break;
+ };
+ }
+
+exit_f:
+ return err;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-04 22:46:08 +0000