patch-2.1.8 linux/net/ipv6/datagram.c
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- Lines: 203
- Date:
Sun Nov 3 11:04:46 1996
- Orig file:
v2.1.7/linux/net/ipv6/datagram.c
- Orig date:
Thu Jan 1 02:00:00 1970
diff -u --recursive --new-file v2.1.7/linux/net/ipv6/datagram.c linux/net/ipv6/datagram.c
@@ -0,0 +1,202 @@
+/*
+ * common UDP/RAW code
+ * Linux INET6 implementation
+ *
+ * Authors:
+ * Pedro Roque <roque@di.fc.ul.pt>
+ *
+ * $Id: datagram.c,v 1.3 1996/10/11 16:03:05 roque 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/socket.h>
+#include <linux/sockios.h>
+#include <linux/in6.h>
+#include <linux/ipv6.h>
+
+#include <net/ipv6.h>
+#include <net/ndisc.h>
+#include <net/ipv6_route.h>
+#include <net/addrconf.h>
+#include <net/transp_v6.h>
+
+
+int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
+{
+ struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
+ struct ipv6_options *opt = (struct ipv6_options *) skb->proto_priv;
+ struct cmsghdr *cmsg = msg->msg_control;
+ int len = msg->msg_controllen;
+
+ msg->msg_controllen = 0;
+
+ if (np->rxinfo && (len >= sizeof(struct cmsghdr) +
+ sizeof(struct in6_pktinfo)))
+ {
+ struct in6_pktinfo *src_info;
+ struct inet6_dev *in6_dev;
+
+ cmsg->cmsg_len = (sizeof(struct cmsghdr) +
+ sizeof(struct in6_pktinfo));
+ cmsg->cmsg_level = SOL_IPV6;
+ cmsg->cmsg_type = IPV6_RXINFO;
+
+ src_info = (struct in6_pktinfo *) cmsg->cmsg_data;
+ in6_dev = ipv6_get_idev(skb->dev);
+
+ if (in6_dev == NULL)
+ {
+ printk(KERN_DEBUG "recv_ctl: unknown device\n");
+ return -ENODEV;
+ }
+
+ src_info->ipi6_ifindex = in6_dev->if_index;
+ ipv6_addr_copy(&src_info->ipi6_addr,
+ &skb->ipv6_hdr->daddr);
+
+ len -= cmsg->cmsg_len;
+ msg->msg_controllen += cmsg->cmsg_len;
+ cmsg = (struct cmsghdr *)((u8*) cmsg + cmsg->cmsg_len);
+ }
+
+ if (opt->srcrt)
+ {
+ int hdrlen = sizeof(struct rt0_hdr) + (opt->srcrt->hdrlen << 3);
+
+ if (len >= sizeof(struct cmsghdr) + hdrlen)
+ {
+ struct rt0_hdr *rt0;
+
+ cmsg->cmsg_len = sizeof(struct cmsghdr) + hdrlen;
+ cmsg->cmsg_level = SOL_IPV6;
+ cmsg->cmsg_type = IPV6_RXINFO;
+
+ rt0 = (struct rt0_hdr *) cmsg->cmsg_data;
+ memcpy(rt0, opt->srcrt, hdrlen);
+
+ len -= cmsg->cmsg_len;
+ msg->msg_controllen += cmsg->cmsg_len;
+ cmsg = (struct cmsghdr *)((u8*) cmsg + cmsg->cmsg_len);
+ }
+ }
+ return 0;
+}
+
+
+int datagram_send_ctl(struct msghdr *msg, struct device **src_dev,
+ struct in6_addr **src_addr, struct ipv6_options *opt)
+{
+ struct inet6_dev *in6_dev = NULL;
+ struct in6_pktinfo *src_info;
+ struct cmsghdr *cmsg;
+ struct ipv6_rt_hdr *rthdr;
+ int len;
+ int err = -EINVAL;
+
+ for (cmsg = msg->msg_control; cmsg; cmsg = cmsg_nxthdr(msg, cmsg))
+ {
+ if (cmsg->cmsg_level != SOL_IPV6)
+ {
+ printk(KERN_DEBUG "cmsg_level %d\n", cmsg->cmsg_level);
+ continue;
+ }
+
+ switch (cmsg->cmsg_type) {
+
+ case IPV6_TXINFO:
+ if (cmsg->cmsg_len < (sizeof(struct cmsghdr) +
+ sizeof(struct in6_pktinfo)))
+ {
+ goto exit_f;
+ }
+
+ src_info = (struct in6_pktinfo *) cmsg->cmsg_data;
+
+ if (src_info->ipi6_ifindex)
+ {
+ in6_dev = ipv6_dev_by_index(src_info->ipi6_ifindex);
+ if (in6_dev == NULL)
+ {
+ goto exit_f;
+ }
+
+ *src_dev = in6_dev->dev;
+ }
+
+ if (!ipv6_addr_any(&src_info->ipi6_addr))
+ {
+ struct inet6_ifaddr *ifp;
+
+ ifp = ipv6_chk_addr(&src_info->ipi6_addr);
+
+ if ( ifp == NULL)
+ {
+ goto exit_f;
+ }
+
+ if (in6_dev && ifp->scope == IFA_LINK &&
+ in6_dev != ifp->idev)
+ {
+ goto exit_f;
+ }
+
+ *src_addr = &src_info->ipi6_addr;
+ err = 0;
+ }
+
+ break;
+
+ case SCM_SRCRT:
+
+ len = cmsg->cmsg_len;
+
+ len -= sizeof(struct cmsghdr);
+
+ /* validate option length */
+ if (len < sizeof(struct ipv6_rt_hdr))
+ {
+ goto exit_f;
+ }
+
+ rthdr = (struct ipv6_rt_hdr *) cmsg->cmsg_data;
+
+ /*
+ * TYPE 0
+ */
+ if (rthdr->type)
+ {
+ goto exit_f;
+ }
+
+ if (((rthdr->hdrlen + 1) << 3) < len)
+ {
+ goto exit_f;
+ }
+
+ /* segments left must also match */
+ if ((rthdr->hdrlen >> 1) != rthdr->segments_left)
+ {
+ goto exit_f;
+ }
+
+ opt->opt_nflen += ((rthdr->hdrlen + 1) << 3);
+ opt->srcrt = rthdr;
+ err = 0;
+
+ break;
+ default:
+ printk(KERN_DEBUG "invalid cmsg type: %d\n",
+ cmsg->cmsg_type);
+ break;
+ }
+ }
+
+ exit_f:
+ return err;
+}
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