mirror of
https://github.com/torvalds/linux.git
synced 2024-12-05 10:32:35 +00:00
dc49c1f94e
From: Catherine Zhang <cxzhang@watson.ibm.com> This patch implements a cleaner fix for the memory leak problem of the original unix datagram getpeersec patch. Instead of creating a security context each time a unix datagram is sent, we only create the security context when the receiver requests it. This new design requires modification of the current unix_getsecpeer_dgram LSM hook and addition of two new hooks, namely, secid_to_secctx and release_secctx. The former retrieves the security context and the latter releases it. A hook is required for releasing the security context because it is up to the security module to decide how that's done. In the case of Selinux, it's a simple kfree operation. Acked-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: David S. Miller <davem@davemloft.net>
1223 lines
28 KiB
C
1223 lines
28 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* The IP to API glue.
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*
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* Version: $Id: ip_sockglue.c,v 1.62 2002/02/01 22:01:04 davem Exp $
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*
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* Authors: see ip.c
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*
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* Fixes:
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* Many : Split from ip.c , see ip.c for history.
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* Martin Mares : TOS setting fixed.
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* Alan Cox : Fixed a couple of oopses in Martin's
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* TOS tweaks.
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* Mike McLagan : Routing by source
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <linux/skbuff.h>
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#include <linux/ip.h>
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#include <linux/icmp.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/icmp.h>
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#include <net/tcp_states.h>
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#include <linux/udp.h>
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#include <linux/igmp.h>
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#include <linux/netfilter.h>
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#include <linux/route.h>
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#include <linux/mroute.h>
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#include <net/route.h>
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#include <net/xfrm.h>
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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#include <net/transp_v6.h>
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#endif
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#include <linux/errqueue.h>
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#include <asm/uaccess.h>
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#define IP_CMSG_PKTINFO 1
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#define IP_CMSG_TTL 2
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#define IP_CMSG_TOS 4
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#define IP_CMSG_RECVOPTS 8
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#define IP_CMSG_RETOPTS 16
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#define IP_CMSG_PASSSEC 32
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/*
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* SOL_IP control messages.
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*/
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static void ip_cmsg_recv_pktinfo(struct msghdr *msg, struct sk_buff *skb)
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{
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struct in_pktinfo info;
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struct rtable *rt = (struct rtable *)skb->dst;
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info.ipi_addr.s_addr = skb->nh.iph->daddr;
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if (rt) {
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info.ipi_ifindex = rt->rt_iif;
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info.ipi_spec_dst.s_addr = rt->rt_spec_dst;
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} else {
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info.ipi_ifindex = 0;
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info.ipi_spec_dst.s_addr = 0;
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}
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put_cmsg(msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
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}
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static void ip_cmsg_recv_ttl(struct msghdr *msg, struct sk_buff *skb)
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{
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int ttl = skb->nh.iph->ttl;
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put_cmsg(msg, SOL_IP, IP_TTL, sizeof(int), &ttl);
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}
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static void ip_cmsg_recv_tos(struct msghdr *msg, struct sk_buff *skb)
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{
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put_cmsg(msg, SOL_IP, IP_TOS, 1, &skb->nh.iph->tos);
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}
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static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
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{
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if (IPCB(skb)->opt.optlen == 0)
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return;
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put_cmsg(msg, SOL_IP, IP_RECVOPTS, IPCB(skb)->opt.optlen, skb->nh.iph+1);
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}
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static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
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{
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unsigned char optbuf[sizeof(struct ip_options) + 40];
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struct ip_options * opt = (struct ip_options*)optbuf;
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if (IPCB(skb)->opt.optlen == 0)
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return;
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if (ip_options_echo(opt, skb)) {
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msg->msg_flags |= MSG_CTRUNC;
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return;
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}
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ip_options_undo(opt);
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put_cmsg(msg, SOL_IP, IP_RETOPTS, opt->optlen, opt->__data);
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}
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static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
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{
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char *secdata;
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u32 seclen, secid;
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int err;
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err = security_socket_getpeersec_dgram(NULL, skb, &secid);
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if (err)
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return;
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err = security_secid_to_secctx(secid, &secdata, &seclen);
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if (err)
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return;
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put_cmsg(msg, SOL_IP, SCM_SECURITY, seclen, secdata);
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security_release_secctx(secdata, seclen);
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}
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void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
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{
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struct inet_sock *inet = inet_sk(skb->sk);
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unsigned flags = inet->cmsg_flags;
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/* Ordered by supposed usage frequency */
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if (flags & 1)
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ip_cmsg_recv_pktinfo(msg, skb);
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if ((flags>>=1) == 0)
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return;
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if (flags & 1)
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ip_cmsg_recv_ttl(msg, skb);
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if ((flags>>=1) == 0)
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return;
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if (flags & 1)
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ip_cmsg_recv_tos(msg, skb);
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if ((flags>>=1) == 0)
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return;
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if (flags & 1)
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ip_cmsg_recv_opts(msg, skb);
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if ((flags>>=1) == 0)
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return;
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if (flags & 1)
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ip_cmsg_recv_retopts(msg, skb);
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if ((flags>>=1) == 0)
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return;
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if (flags & 1)
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ip_cmsg_recv_security(msg, skb);
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}
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int ip_cmsg_send(struct msghdr *msg, struct ipcm_cookie *ipc)
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{
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int err;
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struct cmsghdr *cmsg;
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for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
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if (!CMSG_OK(msg, cmsg))
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return -EINVAL;
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if (cmsg->cmsg_level != SOL_IP)
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continue;
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switch (cmsg->cmsg_type) {
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case IP_RETOPTS:
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err = cmsg->cmsg_len - CMSG_ALIGN(sizeof(struct cmsghdr));
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err = ip_options_get(&ipc->opt, CMSG_DATA(cmsg), err < 40 ? err : 40);
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if (err)
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return err;
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break;
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case IP_PKTINFO:
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{
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struct in_pktinfo *info;
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if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct in_pktinfo)))
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return -EINVAL;
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info = (struct in_pktinfo *)CMSG_DATA(cmsg);
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ipc->oif = info->ipi_ifindex;
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ipc->addr = info->ipi_spec_dst.s_addr;
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break;
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}
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default:
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return -EINVAL;
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}
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}
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return 0;
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}
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/* Special input handler for packets caught by router alert option.
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They are selected only by protocol field, and then processed likely
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local ones; but only if someone wants them! Otherwise, router
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not running rsvpd will kill RSVP.
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It is user level problem, what it will make with them.
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I have no idea, how it will masquearde or NAT them (it is joke, joke :-)),
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but receiver should be enough clever f.e. to forward mtrace requests,
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sent to multicast group to reach destination designated router.
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*/
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struct ip_ra_chain *ip_ra_chain;
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DEFINE_RWLOCK(ip_ra_lock);
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int ip_ra_control(struct sock *sk, unsigned char on, void (*destructor)(struct sock *))
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{
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struct ip_ra_chain *ra, *new_ra, **rap;
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if (sk->sk_type != SOCK_RAW || inet_sk(sk)->num == IPPROTO_RAW)
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return -EINVAL;
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new_ra = on ? kmalloc(sizeof(*new_ra), GFP_KERNEL) : NULL;
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write_lock_bh(&ip_ra_lock);
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for (rap = &ip_ra_chain; (ra=*rap) != NULL; rap = &ra->next) {
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if (ra->sk == sk) {
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if (on) {
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write_unlock_bh(&ip_ra_lock);
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kfree(new_ra);
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return -EADDRINUSE;
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}
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*rap = ra->next;
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write_unlock_bh(&ip_ra_lock);
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if (ra->destructor)
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ra->destructor(sk);
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sock_put(sk);
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kfree(ra);
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return 0;
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}
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}
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if (new_ra == NULL) {
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write_unlock_bh(&ip_ra_lock);
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return -ENOBUFS;
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}
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new_ra->sk = sk;
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new_ra->destructor = destructor;
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new_ra->next = ra;
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*rap = new_ra;
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sock_hold(sk);
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write_unlock_bh(&ip_ra_lock);
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return 0;
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}
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void ip_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
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u16 port, u32 info, u8 *payload)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct sock_exterr_skb *serr;
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if (!inet->recverr)
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return;
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skb = skb_clone(skb, GFP_ATOMIC);
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if (!skb)
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return;
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serr = SKB_EXT_ERR(skb);
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serr->ee.ee_errno = err;
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serr->ee.ee_origin = SO_EE_ORIGIN_ICMP;
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serr->ee.ee_type = skb->h.icmph->type;
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serr->ee.ee_code = skb->h.icmph->code;
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serr->ee.ee_pad = 0;
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serr->ee.ee_info = info;
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serr->ee.ee_data = 0;
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serr->addr_offset = (u8*)&(((struct iphdr*)(skb->h.icmph+1))->daddr) - skb->nh.raw;
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serr->port = port;
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skb->h.raw = payload;
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if (!skb_pull(skb, payload - skb->data) ||
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sock_queue_err_skb(sk, skb))
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kfree_skb(skb);
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}
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void ip_local_error(struct sock *sk, int err, u32 daddr, u16 port, u32 info)
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{
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struct inet_sock *inet = inet_sk(sk);
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struct sock_exterr_skb *serr;
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struct iphdr *iph;
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struct sk_buff *skb;
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if (!inet->recverr)
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return;
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skb = alloc_skb(sizeof(struct iphdr), GFP_ATOMIC);
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if (!skb)
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return;
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iph = (struct iphdr*)skb_put(skb, sizeof(struct iphdr));
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skb->nh.iph = iph;
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iph->daddr = daddr;
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serr = SKB_EXT_ERR(skb);
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serr->ee.ee_errno = err;
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serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
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serr->ee.ee_type = 0;
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serr->ee.ee_code = 0;
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serr->ee.ee_pad = 0;
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serr->ee.ee_info = info;
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serr->ee.ee_data = 0;
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serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
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serr->port = port;
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skb->h.raw = skb->tail;
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__skb_pull(skb, skb->tail - skb->data);
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if (sock_queue_err_skb(sk, skb))
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kfree_skb(skb);
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}
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/*
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* Handle MSG_ERRQUEUE
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*/
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int ip_recv_error(struct sock *sk, struct msghdr *msg, int len)
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{
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struct sock_exterr_skb *serr;
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struct sk_buff *skb, *skb2;
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struct sockaddr_in *sin;
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struct {
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struct sock_extended_err ee;
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struct sockaddr_in offender;
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} errhdr;
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int err;
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int copied;
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err = -EAGAIN;
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skb = skb_dequeue(&sk->sk_error_queue);
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if (skb == NULL)
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goto out;
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copied = skb->len;
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if (copied > len) {
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msg->msg_flags |= MSG_TRUNC;
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copied = len;
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}
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err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
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if (err)
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goto out_free_skb;
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sock_recv_timestamp(msg, sk, skb);
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serr = SKB_EXT_ERR(skb);
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sin = (struct sockaddr_in *)msg->msg_name;
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if (sin) {
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = *(u32*)(skb->nh.raw + serr->addr_offset);
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sin->sin_port = serr->port;
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memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
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}
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memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
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sin = &errhdr.offender;
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sin->sin_family = AF_UNSPEC;
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if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP) {
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struct inet_sock *inet = inet_sk(sk);
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sin->sin_family = AF_INET;
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sin->sin_addr.s_addr = skb->nh.iph->saddr;
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sin->sin_port = 0;
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memset(&sin->sin_zero, 0, sizeof(sin->sin_zero));
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if (inet->cmsg_flags)
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ip_cmsg_recv(msg, skb);
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}
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put_cmsg(msg, SOL_IP, IP_RECVERR, sizeof(errhdr), &errhdr);
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/* Now we could try to dump offended packet options */
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msg->msg_flags |= MSG_ERRQUEUE;
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err = copied;
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/* Reset and regenerate socket error */
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spin_lock_bh(&sk->sk_error_queue.lock);
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sk->sk_err = 0;
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if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
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sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
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spin_unlock_bh(&sk->sk_error_queue.lock);
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sk->sk_error_report(sk);
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} else
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spin_unlock_bh(&sk->sk_error_queue.lock);
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out_free_skb:
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kfree_skb(skb);
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out:
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return err;
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}
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|
|
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/*
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* Socket option code for IP. This is the end of the line after any TCP,UDP etc options on
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* an IP socket.
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*/
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static int do_ip_setsockopt(struct sock *sk, int level,
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int optname, char __user *optval, int optlen)
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{
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struct inet_sock *inet = inet_sk(sk);
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int val=0,err;
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|
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if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
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(1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
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(1<<IP_RETOPTS) | (1<<IP_TOS) |
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(1<<IP_TTL) | (1<<IP_HDRINCL) |
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(1<<IP_MTU_DISCOVER) | (1<<IP_RECVERR) |
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(1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
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(1<<IP_PASSSEC))) ||
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optname == IP_MULTICAST_TTL ||
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optname == IP_MULTICAST_LOOP) {
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if (optlen >= sizeof(int)) {
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if (get_user(val, (int __user *) optval))
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return -EFAULT;
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} else if (optlen >= sizeof(char)) {
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unsigned char ucval;
|
|
|
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if (get_user(ucval, (unsigned char __user *) optval))
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return -EFAULT;
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val = (int) ucval;
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}
|
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}
|
|
|
|
/* If optlen==0, it is equivalent to val == 0 */
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|
|
|
#ifdef CONFIG_IP_MROUTE
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if (optname >= MRT_BASE && optname <= (MRT_BASE + 10))
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return ip_mroute_setsockopt(sk,optname,optval,optlen);
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#endif
|
|
|
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err = 0;
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lock_sock(sk);
|
|
|
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switch (optname) {
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case IP_OPTIONS:
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{
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struct ip_options * opt = NULL;
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if (optlen > 40 || optlen < 0)
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goto e_inval;
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err = ip_options_get_from_user(&opt, optval, optlen);
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if (err)
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break;
|
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if (inet->is_icsk) {
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struct inet_connection_sock *icsk = inet_csk(sk);
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#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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if (sk->sk_family == PF_INET ||
|
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(!((1 << sk->sk_state) &
|
|
(TCPF_LISTEN | TCPF_CLOSE)) &&
|
|
inet->daddr != LOOPBACK4_IPV6)) {
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|
#endif
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|
if (inet->opt)
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|
icsk->icsk_ext_hdr_len -= inet->opt->optlen;
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if (opt)
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icsk->icsk_ext_hdr_len += opt->optlen;
|
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icsk->icsk_sync_mss(sk, icsk->icsk_pmtu_cookie);
|
|
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
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}
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#endif
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}
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opt = xchg(&inet->opt, opt);
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kfree(opt);
|
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break;
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}
|
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case IP_PKTINFO:
|
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if (val)
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inet->cmsg_flags |= IP_CMSG_PKTINFO;
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else
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inet->cmsg_flags &= ~IP_CMSG_PKTINFO;
|
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break;
|
|
case IP_RECVTTL:
|
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if (val)
|
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inet->cmsg_flags |= IP_CMSG_TTL;
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|
else
|
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inet->cmsg_flags &= ~IP_CMSG_TTL;
|
|
break;
|
|
case IP_RECVTOS:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_TOS;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_TOS;
|
|
break;
|
|
case IP_RECVOPTS:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_RECVOPTS;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_RECVOPTS;
|
|
break;
|
|
case IP_RETOPTS:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_RETOPTS;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_RETOPTS;
|
|
break;
|
|
case IP_PASSSEC:
|
|
if (val)
|
|
inet->cmsg_flags |= IP_CMSG_PASSSEC;
|
|
else
|
|
inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
|
|
break;
|
|
case IP_TOS: /* This sets both TOS and Precedence */
|
|
if (sk->sk_type == SOCK_STREAM) {
|
|
val &= ~3;
|
|
val |= inet->tos & 3;
|
|
}
|
|
if (IPTOS_PREC(val) >= IPTOS_PREC_CRITIC_ECP &&
|
|
!capable(CAP_NET_ADMIN)) {
|
|
err = -EPERM;
|
|
break;
|
|
}
|
|
if (inet->tos != val) {
|
|
inet->tos = val;
|
|
sk->sk_priority = rt_tos2priority(val);
|
|
sk_dst_reset(sk);
|
|
}
|
|
break;
|
|
case IP_TTL:
|
|
if (optlen<1)
|
|
goto e_inval;
|
|
if (val != -1 && (val < 1 || val>255))
|
|
goto e_inval;
|
|
inet->uc_ttl = val;
|
|
break;
|
|
case IP_HDRINCL:
|
|
if (sk->sk_type != SOCK_RAW) {
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
inet->hdrincl = val ? 1 : 0;
|
|
break;
|
|
case IP_MTU_DISCOVER:
|
|
if (val<0 || val>2)
|
|
goto e_inval;
|
|
inet->pmtudisc = val;
|
|
break;
|
|
case IP_RECVERR:
|
|
inet->recverr = !!val;
|
|
if (!val)
|
|
skb_queue_purge(&sk->sk_error_queue);
|
|
break;
|
|
case IP_MULTICAST_TTL:
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
goto e_inval;
|
|
if (optlen<1)
|
|
goto e_inval;
|
|
if (val==-1)
|
|
val = 1;
|
|
if (val < 0 || val > 255)
|
|
goto e_inval;
|
|
inet->mc_ttl = val;
|
|
break;
|
|
case IP_MULTICAST_LOOP:
|
|
if (optlen<1)
|
|
goto e_inval;
|
|
inet->mc_loop = !!val;
|
|
break;
|
|
case IP_MULTICAST_IF:
|
|
{
|
|
struct ip_mreqn mreq;
|
|
struct net_device *dev = NULL;
|
|
|
|
if (sk->sk_type == SOCK_STREAM)
|
|
goto e_inval;
|
|
/*
|
|
* Check the arguments are allowable
|
|
*/
|
|
|
|
err = -EFAULT;
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
if (copy_from_user(&mreq,optval,sizeof(mreq)))
|
|
break;
|
|
} else {
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (optlen >= sizeof(struct in_addr) &&
|
|
copy_from_user(&mreq.imr_address,optval,sizeof(struct in_addr)))
|
|
break;
|
|
}
|
|
|
|
if (!mreq.imr_ifindex) {
|
|
if (mreq.imr_address.s_addr == INADDR_ANY) {
|
|
inet->mc_index = 0;
|
|
inet->mc_addr = 0;
|
|
err = 0;
|
|
break;
|
|
}
|
|
dev = ip_dev_find(mreq.imr_address.s_addr);
|
|
if (dev) {
|
|
mreq.imr_ifindex = dev->ifindex;
|
|
dev_put(dev);
|
|
}
|
|
} else
|
|
dev = __dev_get_by_index(mreq.imr_ifindex);
|
|
|
|
|
|
err = -EADDRNOTAVAIL;
|
|
if (!dev)
|
|
break;
|
|
|
|
err = -EINVAL;
|
|
if (sk->sk_bound_dev_if &&
|
|
mreq.imr_ifindex != sk->sk_bound_dev_if)
|
|
break;
|
|
|
|
inet->mc_index = mreq.imr_ifindex;
|
|
inet->mc_addr = mreq.imr_address.s_addr;
|
|
err = 0;
|
|
break;
|
|
}
|
|
|
|
case IP_ADD_MEMBERSHIP:
|
|
case IP_DROP_MEMBERSHIP:
|
|
{
|
|
struct ip_mreqn mreq;
|
|
|
|
if (optlen < sizeof(struct ip_mreq))
|
|
goto e_inval;
|
|
err = -EFAULT;
|
|
if (optlen >= sizeof(struct ip_mreqn)) {
|
|
if(copy_from_user(&mreq,optval,sizeof(mreq)))
|
|
break;
|
|
} else {
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
if (copy_from_user(&mreq,optval,sizeof(struct ip_mreq)))
|
|
break;
|
|
}
|
|
|
|
if (optname == IP_ADD_MEMBERSHIP)
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
else
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
break;
|
|
}
|
|
case IP_MSFILTER:
|
|
{
|
|
extern int sysctl_igmp_max_msf;
|
|
struct ip_msfilter *msf;
|
|
|
|
if (optlen < IP_MSFILTER_SIZE(0))
|
|
goto e_inval;
|
|
if (optlen > sysctl_optmem_max) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
msf = kmalloc(optlen, GFP_KERNEL);
|
|
if (msf == 0) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
err = -EFAULT;
|
|
if (copy_from_user(msf, optval, optlen)) {
|
|
kfree(msf);
|
|
break;
|
|
}
|
|
/* numsrc >= (1G-4) overflow in 32 bits */
|
|
if (msf->imsf_numsrc >= 0x3ffffffcU ||
|
|
msf->imsf_numsrc > sysctl_igmp_max_msf) {
|
|
kfree(msf);
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
if (IP_MSFILTER_SIZE(msf->imsf_numsrc) > optlen) {
|
|
kfree(msf);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
err = ip_mc_msfilter(sk, msf, 0);
|
|
kfree(msf);
|
|
break;
|
|
}
|
|
case IP_BLOCK_SOURCE:
|
|
case IP_UNBLOCK_SOURCE:
|
|
case IP_ADD_SOURCE_MEMBERSHIP:
|
|
case IP_DROP_SOURCE_MEMBERSHIP:
|
|
{
|
|
struct ip_mreq_source mreqs;
|
|
int omode, add;
|
|
|
|
if (optlen != sizeof(struct ip_mreq_source))
|
|
goto e_inval;
|
|
if (copy_from_user(&mreqs, optval, sizeof(mreqs))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (optname == IP_BLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 1;
|
|
} else if (optname == IP_UNBLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 0;
|
|
} else if (optname == IP_ADD_SOURCE_MEMBERSHIP) {
|
|
struct ip_mreqn mreq;
|
|
|
|
mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
|
|
mreq.imr_address.s_addr = mreqs.imr_interface;
|
|
mreq.imr_ifindex = 0;
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
if (err && err != -EADDRINUSE)
|
|
break;
|
|
omode = MCAST_INCLUDE;
|
|
add = 1;
|
|
} else /* IP_DROP_SOURCE_MEMBERSHIP */ {
|
|
omode = MCAST_INCLUDE;
|
|
add = 0;
|
|
}
|
|
err = ip_mc_source(add, omode, sk, &mreqs, 0);
|
|
break;
|
|
}
|
|
case MCAST_JOIN_GROUP:
|
|
case MCAST_LEAVE_GROUP:
|
|
{
|
|
struct group_req greq;
|
|
struct sockaddr_in *psin;
|
|
struct ip_mreqn mreq;
|
|
|
|
if (optlen < sizeof(struct group_req))
|
|
goto e_inval;
|
|
err = -EFAULT;
|
|
if(copy_from_user(&greq, optval, sizeof(greq)))
|
|
break;
|
|
psin = (struct sockaddr_in *)&greq.gr_group;
|
|
if (psin->sin_family != AF_INET)
|
|
goto e_inval;
|
|
memset(&mreq, 0, sizeof(mreq));
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_ifindex = greq.gr_interface;
|
|
|
|
if (optname == MCAST_JOIN_GROUP)
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
else
|
|
err = ip_mc_leave_group(sk, &mreq);
|
|
break;
|
|
}
|
|
case MCAST_JOIN_SOURCE_GROUP:
|
|
case MCAST_LEAVE_SOURCE_GROUP:
|
|
case MCAST_BLOCK_SOURCE:
|
|
case MCAST_UNBLOCK_SOURCE:
|
|
{
|
|
struct group_source_req greqs;
|
|
struct ip_mreq_source mreqs;
|
|
struct sockaddr_in *psin;
|
|
int omode, add;
|
|
|
|
if (optlen != sizeof(struct group_source_req))
|
|
goto e_inval;
|
|
if (copy_from_user(&greqs, optval, sizeof(greqs))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
if (greqs.gsr_group.ss_family != AF_INET ||
|
|
greqs.gsr_source.ss_family != AF_INET) {
|
|
err = -EADDRNOTAVAIL;
|
|
break;
|
|
}
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
|
mreqs.imr_multiaddr = psin->sin_addr.s_addr;
|
|
psin = (struct sockaddr_in *)&greqs.gsr_source;
|
|
mreqs.imr_sourceaddr = psin->sin_addr.s_addr;
|
|
mreqs.imr_interface = 0; /* use index for mc_source */
|
|
|
|
if (optname == MCAST_BLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 1;
|
|
} else if (optname == MCAST_UNBLOCK_SOURCE) {
|
|
omode = MCAST_EXCLUDE;
|
|
add = 0;
|
|
} else if (optname == MCAST_JOIN_SOURCE_GROUP) {
|
|
struct ip_mreqn mreq;
|
|
|
|
psin = (struct sockaddr_in *)&greqs.gsr_group;
|
|
mreq.imr_multiaddr = psin->sin_addr;
|
|
mreq.imr_address.s_addr = 0;
|
|
mreq.imr_ifindex = greqs.gsr_interface;
|
|
err = ip_mc_join_group(sk, &mreq);
|
|
if (err && err != -EADDRINUSE)
|
|
break;
|
|
greqs.gsr_interface = mreq.imr_ifindex;
|
|
omode = MCAST_INCLUDE;
|
|
add = 1;
|
|
} else /* MCAST_LEAVE_SOURCE_GROUP */ {
|
|
omode = MCAST_INCLUDE;
|
|
add = 0;
|
|
}
|
|
err = ip_mc_source(add, omode, sk, &mreqs,
|
|
greqs.gsr_interface);
|
|
break;
|
|
}
|
|
case MCAST_MSFILTER:
|
|
{
|
|
extern int sysctl_igmp_max_msf;
|
|
struct sockaddr_in *psin;
|
|
struct ip_msfilter *msf = NULL;
|
|
struct group_filter *gsf = NULL;
|
|
int msize, i, ifindex;
|
|
|
|
if (optlen < GROUP_FILTER_SIZE(0))
|
|
goto e_inval;
|
|
if (optlen > sysctl_optmem_max) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
gsf = kmalloc(optlen,GFP_KERNEL);
|
|
if (gsf == 0) {
|
|
err = -ENOBUFS;
|
|
break;
|
|
}
|
|
err = -EFAULT;
|
|
if (copy_from_user(gsf, optval, optlen)) {
|
|
goto mc_msf_out;
|
|
}
|
|
/* numsrc >= (4G-140)/128 overflow in 32 bits */
|
|
if (gsf->gf_numsrc >= 0x1ffffff ||
|
|
gsf->gf_numsrc > sysctl_igmp_max_msf) {
|
|
err = -ENOBUFS;
|
|
goto mc_msf_out;
|
|
}
|
|
if (GROUP_FILTER_SIZE(gsf->gf_numsrc) > optlen) {
|
|
err = -EINVAL;
|
|
goto mc_msf_out;
|
|
}
|
|
msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
|
|
msf = kmalloc(msize,GFP_KERNEL);
|
|
if (msf == 0) {
|
|
err = -ENOBUFS;
|
|
goto mc_msf_out;
|
|
}
|
|
ifindex = gsf->gf_interface;
|
|
psin = (struct sockaddr_in *)&gsf->gf_group;
|
|
if (psin->sin_family != AF_INET) {
|
|
err = -EADDRNOTAVAIL;
|
|
goto mc_msf_out;
|
|
}
|
|
msf->imsf_multiaddr = psin->sin_addr.s_addr;
|
|
msf->imsf_interface = 0;
|
|
msf->imsf_fmode = gsf->gf_fmode;
|
|
msf->imsf_numsrc = gsf->gf_numsrc;
|
|
err = -EADDRNOTAVAIL;
|
|
for (i=0; i<gsf->gf_numsrc; ++i) {
|
|
psin = (struct sockaddr_in *)&gsf->gf_slist[i];
|
|
|
|
if (psin->sin_family != AF_INET)
|
|
goto mc_msf_out;
|
|
msf->imsf_slist[i] = psin->sin_addr.s_addr;
|
|
}
|
|
kfree(gsf);
|
|
gsf = NULL;
|
|
|
|
err = ip_mc_msfilter(sk, msf, ifindex);
|
|
mc_msf_out:
|
|
kfree(msf);
|
|
kfree(gsf);
|
|
break;
|
|
}
|
|
case IP_ROUTER_ALERT:
|
|
err = ip_ra_control(sk, val ? 1 : 0, NULL);
|
|
break;
|
|
|
|
case IP_FREEBIND:
|
|
if (optlen<1)
|
|
goto e_inval;
|
|
inet->freebind = !!val;
|
|
break;
|
|
|
|
case IP_IPSEC_POLICY:
|
|
case IP_XFRM_POLICY:
|
|
err = -EPERM;
|
|
if (!capable(CAP_NET_ADMIN))
|
|
break;
|
|
err = xfrm_user_policy(sk, optname, optval, optlen);
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
release_sock(sk);
|
|
return err;
|
|
|
|
e_inval:
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
|
|
int ip_setsockopt(struct sock *sk, int level,
|
|
int optname, char __user *optval, int optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level != SOL_IP)
|
|
return -ENOPROTOOPT;
|
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
|
optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
|
|
#ifdef CONFIG_IP_MROUTE
|
|
&& (optname < MRT_BASE || optname > (MRT_BASE + 10))
|
|
#endif
|
|
) {
|
|
lock_sock(sk);
|
|
err = nf_setsockopt(sk, PF_INET, optname, optval, optlen);
|
|
release_sock(sk);
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_ip_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int optlen)
|
|
{
|
|
int err;
|
|
|
|
if (level != SOL_IP)
|
|
return -ENOPROTOOPT;
|
|
|
|
err = do_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_HDRINCL &&
|
|
optname != IP_IPSEC_POLICY && optname != IP_XFRM_POLICY
|
|
#ifdef CONFIG_IP_MROUTE
|
|
&& (optname < MRT_BASE || optname > (MRT_BASE + 10))
|
|
#endif
|
|
) {
|
|
lock_sock(sk);
|
|
err = compat_nf_setsockopt(sk, PF_INET, optname,
|
|
optval, optlen);
|
|
release_sock(sk);
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(compat_ip_setsockopt);
|
|
#endif
|
|
|
|
/*
|
|
* Get the options. Note for future reference. The GET of IP options gets the
|
|
* _received_ ones. The set sets the _sent_ ones.
|
|
*/
|
|
|
|
static int do_ip_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
int val;
|
|
int len;
|
|
|
|
if(level!=SOL_IP)
|
|
return -EOPNOTSUPP;
|
|
|
|
#ifdef CONFIG_IP_MROUTE
|
|
if(optname>=MRT_BASE && optname <=MRT_BASE+10)
|
|
{
|
|
return ip_mroute_getsockopt(sk,optname,optval,optlen);
|
|
}
|
|
#endif
|
|
|
|
if(get_user(len,optlen))
|
|
return -EFAULT;
|
|
if(len < 0)
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
switch(optname) {
|
|
case IP_OPTIONS:
|
|
{
|
|
unsigned char optbuf[sizeof(struct ip_options)+40];
|
|
struct ip_options * opt = (struct ip_options*)optbuf;
|
|
opt->optlen = 0;
|
|
if (inet->opt)
|
|
memcpy(optbuf, inet->opt,
|
|
sizeof(struct ip_options)+
|
|
inet->opt->optlen);
|
|
release_sock(sk);
|
|
|
|
if (opt->optlen == 0)
|
|
return put_user(0, optlen);
|
|
|
|
ip_options_undo(opt);
|
|
|
|
len = min_t(unsigned int, len, opt->optlen);
|
|
if(put_user(len, optlen))
|
|
return -EFAULT;
|
|
if(copy_to_user(optval, opt->__data, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case IP_PKTINFO:
|
|
val = (inet->cmsg_flags & IP_CMSG_PKTINFO) != 0;
|
|
break;
|
|
case IP_RECVTTL:
|
|
val = (inet->cmsg_flags & IP_CMSG_TTL) != 0;
|
|
break;
|
|
case IP_RECVTOS:
|
|
val = (inet->cmsg_flags & IP_CMSG_TOS) != 0;
|
|
break;
|
|
case IP_RECVOPTS:
|
|
val = (inet->cmsg_flags & IP_CMSG_RECVOPTS) != 0;
|
|
break;
|
|
case IP_RETOPTS:
|
|
val = (inet->cmsg_flags & IP_CMSG_RETOPTS) != 0;
|
|
break;
|
|
case IP_PASSSEC:
|
|
val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
|
|
break;
|
|
case IP_TOS:
|
|
val = inet->tos;
|
|
break;
|
|
case IP_TTL:
|
|
val = (inet->uc_ttl == -1 ?
|
|
sysctl_ip_default_ttl :
|
|
inet->uc_ttl);
|
|
break;
|
|
case IP_HDRINCL:
|
|
val = inet->hdrincl;
|
|
break;
|
|
case IP_MTU_DISCOVER:
|
|
val = inet->pmtudisc;
|
|
break;
|
|
case IP_MTU:
|
|
{
|
|
struct dst_entry *dst;
|
|
val = 0;
|
|
dst = sk_dst_get(sk);
|
|
if (dst) {
|
|
val = dst_mtu(dst);
|
|
dst_release(dst);
|
|
}
|
|
if (!val) {
|
|
release_sock(sk);
|
|
return -ENOTCONN;
|
|
}
|
|
break;
|
|
}
|
|
case IP_RECVERR:
|
|
val = inet->recverr;
|
|
break;
|
|
case IP_MULTICAST_TTL:
|
|
val = inet->mc_ttl;
|
|
break;
|
|
case IP_MULTICAST_LOOP:
|
|
val = inet->mc_loop;
|
|
break;
|
|
case IP_MULTICAST_IF:
|
|
{
|
|
struct in_addr addr;
|
|
len = min_t(unsigned int, len, sizeof(struct in_addr));
|
|
addr.s_addr = inet->mc_addr;
|
|
release_sock(sk);
|
|
|
|
if(put_user(len, optlen))
|
|
return -EFAULT;
|
|
if(copy_to_user(optval, &addr, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
case IP_MSFILTER:
|
|
{
|
|
struct ip_msfilter msf;
|
|
int err;
|
|
|
|
if (len < IP_MSFILTER_SIZE(0)) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
if (copy_from_user(&msf, optval, IP_MSFILTER_SIZE(0))) {
|
|
release_sock(sk);
|
|
return -EFAULT;
|
|
}
|
|
err = ip_mc_msfget(sk, &msf,
|
|
(struct ip_msfilter __user *)optval, optlen);
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
case MCAST_MSFILTER:
|
|
{
|
|
struct group_filter gsf;
|
|
int err;
|
|
|
|
if (len < GROUP_FILTER_SIZE(0)) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0))) {
|
|
release_sock(sk);
|
|
return -EFAULT;
|
|
}
|
|
err = ip_mc_gsfget(sk, &gsf,
|
|
(struct group_filter __user *)optval, optlen);
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
case IP_PKTOPTIONS:
|
|
{
|
|
struct msghdr msg;
|
|
|
|
release_sock(sk);
|
|
|
|
if (sk->sk_type != SOCK_STREAM)
|
|
return -ENOPROTOOPT;
|
|
|
|
msg.msg_control = optval;
|
|
msg.msg_controllen = len;
|
|
msg.msg_flags = 0;
|
|
|
|
if (inet->cmsg_flags & IP_CMSG_PKTINFO) {
|
|
struct in_pktinfo info;
|
|
|
|
info.ipi_addr.s_addr = inet->rcv_saddr;
|
|
info.ipi_spec_dst.s_addr = inet->rcv_saddr;
|
|
info.ipi_ifindex = inet->mc_index;
|
|
put_cmsg(&msg, SOL_IP, IP_PKTINFO, sizeof(info), &info);
|
|
}
|
|
if (inet->cmsg_flags & IP_CMSG_TTL) {
|
|
int hlim = inet->mc_ttl;
|
|
put_cmsg(&msg, SOL_IP, IP_TTL, sizeof(hlim), &hlim);
|
|
}
|
|
len -= msg.msg_controllen;
|
|
return put_user(len, optlen);
|
|
}
|
|
case IP_FREEBIND:
|
|
val = inet->freebind;
|
|
break;
|
|
default:
|
|
release_sock(sk);
|
|
return -ENOPROTOOPT;
|
|
}
|
|
release_sock(sk);
|
|
|
|
if (len < sizeof(int) && len > 0 && val>=0 && val<255) {
|
|
unsigned char ucval = (unsigned char)val;
|
|
len = 1;
|
|
if(put_user(len, optlen))
|
|
return -EFAULT;
|
|
if(copy_to_user(optval,&ucval,1))
|
|
return -EFAULT;
|
|
} else {
|
|
len = min_t(unsigned int, sizeof(int), len);
|
|
if(put_user(len, optlen))
|
|
return -EFAULT;
|
|
if(copy_to_user(optval,&val,len))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int ip_getsockopt(struct sock *sk, int level,
|
|
int optname, char __user *optval, int __user *optlen)
|
|
{
|
|
int err;
|
|
|
|
err = do_ip_getsockopt(sk, level, optname, optval, optlen);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
|
|
#ifdef CONFIG_IP_MROUTE
|
|
&& (optname < MRT_BASE || optname > MRT_BASE+10)
|
|
#endif
|
|
) {
|
|
int len;
|
|
|
|
if(get_user(len,optlen))
|
|
return -EFAULT;
|
|
|
|
lock_sock(sk);
|
|
err = nf_getsockopt(sk, PF_INET, optname, optval,
|
|
&len);
|
|
release_sock(sk);
|
|
if (err >= 0)
|
|
err = put_user(len, optlen);
|
|
return err;
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_ip_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
|
|
#ifdef CONFIG_NETFILTER
|
|
/* we need to exclude all possible ENOPROTOOPTs except default case */
|
|
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS
|
|
#ifdef CONFIG_IP_MROUTE
|
|
&& (optname < MRT_BASE || optname > MRT_BASE+10)
|
|
#endif
|
|
) {
|
|
int len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
lock_sock(sk);
|
|
err = compat_nf_getsockopt(sk, PF_INET, optname, optval, &len);
|
|
release_sock(sk);
|
|
if (err >= 0)
|
|
err = put_user(len, optlen);
|
|
return err;
|
|
}
|
|
#endif
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(compat_ip_getsockopt);
|
|
#endif
|
|
|
|
EXPORT_SYMBOL(ip_cmsg_recv);
|
|
|
|
EXPORT_SYMBOL(ip_getsockopt);
|
|
EXPORT_SYMBOL(ip_setsockopt);
|