diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv6/datagram.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/ipv6/datagram.c')
-rw-r--r-- | net/ipv6/datagram.c | 600 |
1 files changed, 600 insertions, 0 deletions
diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c new file mode 100644 index 0000000..65b9375 --- /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; +} |