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Diffstat (limited to 'pfinet/linux-src/net/ipv4/raw.c')
-rw-r--r--pfinet/linux-src/net/ipv4/raw.c573
1 files changed, 573 insertions, 0 deletions
diff --git a/pfinet/linux-src/net/ipv4/raw.c b/pfinet/linux-src/net/ipv4/raw.c
new file mode 100644
index 00000000..5e7910dd
--- /dev/null
+++ b/pfinet/linux-src/net/ipv4/raw.c
@@ -0,0 +1,573 @@
+/*
+ * INET An implementation of the TCP/IP protocol suite for the LINUX
+ * operating system. INET is implemented using the BSD Socket
+ * interface as the means of communication with the user level.
+ *
+ * RAW - implementation of IP "raw" sockets.
+ *
+ * Version: $Id: raw.c,v 1.39.2.1 1999/06/20 20:14:50 davem Exp $
+ *
+ * Authors: Ross Biro, <bir7@leland.Stanford.Edu>
+ * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
+ *
+ * Fixes:
+ * Alan Cox : verify_area() fixed up
+ * Alan Cox : ICMP error handling
+ * Alan Cox : EMSGSIZE if you send too big a packet
+ * Alan Cox : Now uses generic datagrams and shared skbuff
+ * library. No more peek crashes, no more backlogs
+ * Alan Cox : Checks sk->broadcast.
+ * Alan Cox : Uses skb_free_datagram/skb_copy_datagram
+ * Alan Cox : Raw passes ip options too
+ * Alan Cox : Setsocketopt added
+ * Alan Cox : Fixed error return for broadcasts
+ * Alan Cox : Removed wake_up calls
+ * Alan Cox : Use ttl/tos
+ * Alan Cox : Cleaned up old debugging
+ * Alan Cox : Use new kernel side addresses
+ * Arnt Gulbrandsen : Fixed MSG_DONTROUTE in raw sockets.
+ * Alan Cox : BSD style RAW socket demultiplexing.
+ * Alan Cox : Beginnings of mrouted support.
+ * Alan Cox : Added IP_HDRINCL option.
+ * Alan Cox : Skip broadcast check if BSDism set.
+ * David S. Miller : New socket lookup architecture.
+ *
+ * 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/config.h>
+#include <asm/system.h>
+#include <asm/uaccess.h>
+#include <linux/types.h>
+#include <linux/sched.h>
+#include <linux/errno.h>
+#include <linux/timer.h>
+#include <linux/mm.h>
+#include <linux/kernel.h>
+#include <linux/fcntl.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/mroute.h>
+#include <net/ip.h>
+#include <net/protocol.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <net/icmp.h>
+#include <net/udp.h>
+#include <net/raw.h>
+#include <net/checksum.h>
+
+#ifdef CONFIG_IP_MROUTE
+struct sock *mroute_socket=NULL;
+#endif
+
+struct sock *raw_v4_htable[RAWV4_HTABLE_SIZE];
+
+static void raw_v4_hash(struct sock *sk)
+{
+ struct sock **skp = &raw_v4_htable[sk->num & (RAWV4_HTABLE_SIZE - 1)];
+
+ SOCKHASH_LOCK();
+ if ((sk->next = *skp) != NULL)
+ (*skp)->pprev = &sk->next;
+ *skp = sk;
+ sk->pprev = skp;
+ SOCKHASH_UNLOCK();
+}
+
+static void raw_v4_unhash(struct sock *sk)
+{
+ SOCKHASH_LOCK();
+ if (sk->pprev) {
+ if (sk->next)
+ sk->next->pprev = sk->pprev;
+ *sk->pprev = sk->next;
+ sk->pprev = NULL;
+ }
+ SOCKHASH_UNLOCK();
+}
+
+/* Grumble... icmp and ip_input want to get at this... */
+struct sock *raw_v4_lookup(struct sock *sk, unsigned short num,
+ unsigned long raddr, unsigned long laddr, int dif)
+{
+ struct sock *s = sk;
+
+ SOCKHASH_LOCK();
+ for(s = sk; s; s = s->next) {
+ if((s->num == num) &&
+ !(s->dead && (s->state == TCP_CLOSE)) &&
+ !(s->daddr && s->daddr != raddr) &&
+ !(s->rcv_saddr && s->rcv_saddr != laddr) &&
+ !(s->bound_dev_if && s->bound_dev_if != dif))
+ break; /* gotcha */
+ }
+ SOCKHASH_UNLOCK();
+ return s;
+}
+
+void raw_err (struct sock *sk, struct sk_buff *skb)
+{
+ int type = skb->h.icmph->type;
+ int code = skb->h.icmph->code;
+ u32 info = 0;
+ int err = 0;
+ int harderr = 0;
+
+ /* Report error on raw socket, if:
+ 1. User requested ip_recverr.
+ 2. Socket is connected (otherwise the error indication
+ is useless without ip_recverr and error is hard.
+ */
+ if (!sk->ip_recverr && sk->state != TCP_ESTABLISHED)
+ return;
+
+ switch (type) {
+ default:
+ case ICMP_TIME_EXCEEDED:
+ err = EHOSTUNREACH;
+ break;
+ case ICMP_SOURCE_QUENCH:
+ return;
+ case ICMP_PARAMETERPROB:
+ err = EPROTO;
+ info = ntohl(skb->h.icmph->un.gateway)>>24;
+ harderr = 1;
+ break;
+ case ICMP_DEST_UNREACH:
+ err = EHOSTUNREACH;
+ if (code > NR_ICMP_UNREACH)
+ break;
+ err = icmp_err_convert[code].errno;
+ harderr = icmp_err_convert[code].fatal;
+ if (code == ICMP_FRAG_NEEDED) {
+ harderr = (sk->ip_pmtudisc != IP_PMTUDISC_DONT);
+ err = EMSGSIZE;
+ info = ntohs(skb->h.icmph->un.frag.mtu);
+ }
+ }
+
+ if (sk->ip_recverr)
+ ip_icmp_error(sk, skb, err, 0, info, (u8 *)(skb->h.icmph + 1));
+
+ if (sk->ip_recverr || harderr) {
+ sk->err = err;
+ sk->error_report(sk);
+ }
+}
+
+static int raw_rcv_skb(struct sock * sk, struct sk_buff * skb)
+{
+ /* Charge it to the socket. */
+
+ if (sock_queue_rcv_skb(sk,skb)<0)
+ {
+ ip_statistics.IpInDiscards++;
+ kfree_skb(skb);
+ return -1;
+ }
+
+ ip_statistics.IpInDelivers++;
+ return 0;
+}
+
+/*
+ * This should be the easiest of all, all we do is
+ * copy it into a buffer. All demultiplexing is done
+ * in ip.c
+ */
+
+int raw_rcv(struct sock *sk, struct sk_buff *skb)
+{
+ /* Now we need to copy this into memory. */
+ skb_trim(skb, ntohs(skb->nh.iph->tot_len));
+
+ skb->h.raw = skb->nh.raw;
+
+ raw_rcv_skb(sk, skb);
+ return 0;
+}
+
+struct rawfakehdr
+{
+ struct iovec *iov;
+ u32 saddr;
+};
+
+/*
+ * Send a RAW IP packet.
+ */
+
+/*
+ * Callback support is trivial for SOCK_RAW
+ */
+
+static int raw_getfrag(const void *p, char *to, unsigned int offset, unsigned int fraglen)
+{
+ struct rawfakehdr *rfh = (struct rawfakehdr *) p;
+ return memcpy_fromiovecend(to, rfh->iov, offset, fraglen);
+}
+
+/*
+ * IPPROTO_RAW needs extra work.
+ */
+
+static int raw_getrawfrag(const void *p, char *to, unsigned int offset, unsigned int fraglen)
+{
+ struct rawfakehdr *rfh = (struct rawfakehdr *) p;
+
+ if (memcpy_fromiovecend(to, rfh->iov, offset, fraglen))
+ return -EFAULT;
+
+ if (offset==0) {
+ struct iphdr *iph = (struct iphdr *)to;
+ if (!iph->saddr)
+ iph->saddr = rfh->saddr;
+ iph->check=0;
+ iph->tot_len=htons(fraglen); /* This is right as you can't frag
+ RAW packets */
+ /*
+ * Deliberate breach of modularity to keep
+ * ip_build_xmit clean (well less messy).
+ */
+ if (!iph->id)
+ iph->id = htons(ip_id_count++);
+ iph->check=ip_fast_csum((unsigned char *)iph, iph->ihl);
+ }
+ return 0;
+}
+
+static int raw_sendmsg(struct sock *sk, struct msghdr *msg, int len)
+{
+ struct ipcm_cookie ipc;
+ struct rawfakehdr rfh;
+ struct rtable *rt = NULL;
+ int free = 0;
+ u32 daddr;
+ u8 tos;
+ int err;
+
+ /* This check is ONLY to check for arithmetic overflow
+ on integer(!) len. Not more! Real check will be made
+ in ip_build_xmit --ANK
+
+ BTW socket.c -> af_*.c -> ... make multiple
+ invalid conversions size_t -> int. We MUST repair it f.e.
+ by replacing all of them with size_t and revise all
+ the places sort of len += sizeof(struct iphdr)
+ If len was ULONG_MAX-10 it would be cathastrophe --ANK
+ */
+
+ if (len < 0 || len > 0xFFFF)
+ return -EMSGSIZE;
+
+ /*
+ * Check the flags.
+ */
+
+ if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */
+ return -EOPNOTSUPP;
+
+ if (msg->msg_flags & ~(MSG_DONTROUTE|MSG_DONTWAIT))
+ return(-EINVAL);
+
+ /*
+ * Get and verify the address.
+ */
+
+ if (msg->msg_namelen) {
+ struct sockaddr_in *usin = (struct sockaddr_in*)msg->msg_name;
+ if (msg->msg_namelen < sizeof(*usin))
+ return(-EINVAL);
+ if (usin->sin_family != AF_INET) {
+ static int complained;
+ if (!complained++)
+ printk(KERN_INFO "%s forgot to set AF_INET in raw sendmsg. Fix it!\n", current->comm);
+ if (usin->sin_family)
+ return -EINVAL;
+ }
+ daddr = usin->sin_addr.s_addr;
+ /* ANK: I did not forget to get protocol from port field.
+ * I just do not know, who uses this weirdness.
+ * IP_HDRINCL is much more convenient.
+ */
+ } else {
+ if (sk->state != TCP_ESTABLISHED)
+ return(-EINVAL);
+ daddr = sk->daddr;
+ }
+
+ ipc.addr = sk->saddr;
+ ipc.opt = NULL;
+ ipc.oif = sk->bound_dev_if;
+
+ if (msg->msg_controllen) {
+ int tmp = ip_cmsg_send(msg, &ipc);
+ if (tmp)
+ return tmp;
+ if (ipc.opt)
+ free=1;
+ }
+
+ rfh.saddr = ipc.addr;
+ ipc.addr = daddr;
+
+ if (!ipc.opt)
+ ipc.opt = sk->opt;
+
+ if (ipc.opt) {
+ err = -EINVAL;
+ /* Linux does not mangle headers on raw sockets,
+ * so that IP options + IP_HDRINCL is non-sense.
+ */
+ if (sk->ip_hdrincl)
+ goto done;
+ if (ipc.opt->srr) {
+ if (!daddr)
+ goto done;
+ daddr = ipc.opt->faddr;
+ }
+ }
+ tos = RT_TOS(sk->ip_tos) | sk->localroute;
+ if (msg->msg_flags&MSG_DONTROUTE)
+ tos |= RTO_ONLINK;
+
+ if (MULTICAST(daddr)) {
+ if (!ipc.oif)
+ ipc.oif = sk->ip_mc_index;
+ if (!rfh.saddr)
+ rfh.saddr = sk->ip_mc_addr;
+ }
+
+ err = ip_route_output(&rt, daddr, rfh.saddr, tos, ipc.oif);
+
+ if (err)
+ goto done;
+
+ err = -EACCES;
+ if (rt->rt_flags&RTCF_BROADCAST && !sk->broadcast)
+ goto done;
+
+ rfh.iov = msg->msg_iov;
+ rfh.saddr = rt->rt_src;
+ if (!ipc.addr)
+ ipc.addr = rt->rt_dst;
+ err=ip_build_xmit(sk, sk->ip_hdrincl ? raw_getrawfrag : raw_getfrag,
+ &rfh, len, &ipc, rt, msg->msg_flags);
+
+done:
+ if (free)
+ kfree(ipc.opt);
+ ip_rt_put(rt);
+
+ return err<0 ? err : len;
+}
+
+static void raw_close(struct sock *sk, long timeout)
+{
+ /* Observation: when raw_close is called, processes have
+ no access to socket anymore. But net still has.
+ Step one, detach it from networking:
+
+ A. Remove from hash tables.
+ */
+ sk->state = TCP_CLOSE;
+ raw_v4_unhash(sk);
+ /*
+ B. Raw sockets may have direct kernel refereneces. Kill them.
+ */
+ ip_ra_control(sk, 0, NULL);
+
+ /* In this point socket cannot receive new packets anymore */
+
+
+ /* But we still have packets pending on receive
+ queue and probably, our own packets waiting in device queues.
+ sock_destroy will drain receive queue, but transmitted
+ packets will delay socket destruction.
+ Set sk->dead=1 in order to prevent wakeups, when these
+ packet will be freed.
+ */
+ sk->dead=1;
+ destroy_sock(sk);
+
+ /* That's all. No races here. */
+}
+
+/* This gets rid of all the nasties in af_inet. -DaveM */
+static int raw_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
+{
+ struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
+ int chk_addr_ret;
+
+ if((sk->state != TCP_CLOSE) || (addr_len < sizeof(struct sockaddr_in)))
+ return -EINVAL;
+ chk_addr_ret = inet_addr_type(addr->sin_addr.s_addr);
+ if(addr->sin_addr.s_addr != 0 && chk_addr_ret != RTN_LOCAL &&
+ chk_addr_ret != RTN_MULTICAST && chk_addr_ret != RTN_BROADCAST) {
+#ifdef CONFIG_IP_TRANSPARENT_PROXY
+ /* Superuser may bind to any address to allow transparent proxying. */
+ if(chk_addr_ret != RTN_UNICAST || !capable(CAP_NET_ADMIN))
+#endif
+ return -EADDRNOTAVAIL;
+ }
+ sk->rcv_saddr = sk->saddr = addr->sin_addr.s_addr;
+ if(chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
+ sk->saddr = 0; /* Use device */
+ dst_release(xchg(&sk->dst_cache, NULL));
+ return 0;
+}
+
+/*
+ * This should be easy, if there is something there
+ * we return it, otherwise we block.
+ */
+
+int raw_recvmsg(struct sock *sk, struct msghdr *msg, int len,
+ int noblock, int flags,int *addr_len)
+{
+ int copied=0;
+ struct sk_buff *skb;
+ int err;
+ struct sockaddr_in *sin=(struct sockaddr_in *)msg->msg_name;
+
+ if (flags & MSG_OOB)
+ return -EOPNOTSUPP;
+
+ if (addr_len)
+ *addr_len=sizeof(*sin);
+
+ if (flags & MSG_ERRQUEUE)
+ return ip_recv_error(sk, msg, len);
+
+ skb=skb_recv_datagram(sk,flags,noblock,&err);
+ if(skb==NULL)
+ return err;
+
+ copied = skb->len;
+ if (len < copied)
+ {
+ msg->msg_flags |= MSG_TRUNC;
+ copied = len;
+ }
+
+ err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
+ if (err)
+ goto done;
+
+ sk->stamp=skb->stamp;
+
+ /* Copy the address. */
+ if (sin) {
+ sin->sin_family = AF_INET;
+ sin->sin_addr.s_addr = skb->nh.iph->saddr;
+ }
+ if (sk->ip_cmsg_flags)
+ ip_cmsg_recv(msg, skb);
+done:
+ skb_free_datagram(sk, skb);
+ return (err ? : copied);
+}
+
+static int raw_init(struct sock *sk)
+{
+ struct raw_opt *tp = &(sk->tp_pinfo.tp_raw4);
+ if (sk->num == IPPROTO_ICMP)
+ memset(&tp->filter, 0, sizeof(tp->filter));
+ return 0;
+}
+
+static int raw_seticmpfilter(struct sock *sk, char *optval, int optlen)
+{
+ if (optlen > sizeof(struct icmp_filter))
+ optlen = sizeof(struct icmp_filter);
+ if (copy_from_user(&sk->tp_pinfo.tp_raw4.filter, optval, optlen))
+ return -EFAULT;
+ return 0;
+}
+
+static int raw_geticmpfilter(struct sock *sk, char *optval, int *optlen)
+{
+ int len;
+
+ if (get_user(len,optlen))
+ return -EFAULT;
+ if (len > sizeof(struct icmp_filter))
+ len = sizeof(struct icmp_filter);
+ if (put_user(len, optlen))
+ return -EFAULT;
+ if (copy_to_user(optval, &sk->tp_pinfo.tp_raw4.filter, len))
+ return -EFAULT;
+ return 0;
+}
+
+static int raw_setsockopt(struct sock *sk, int level, int optname,
+ char *optval, int optlen)
+{
+ if (level != SOL_RAW)
+ return ip_setsockopt(sk, level, optname, optval, optlen);
+
+ switch (optname) {
+ case ICMP_FILTER:
+ if (sk->num != IPPROTO_ICMP)
+ return -EOPNOTSUPP;
+ return raw_seticmpfilter(sk, optval, optlen);
+ };
+
+ return -ENOPROTOOPT;
+}
+
+static int raw_getsockopt(struct sock *sk, int level, int optname,
+ char *optval, int *optlen)
+{
+ if (level != SOL_RAW)
+ return ip_getsockopt(sk, level, optname, optval, optlen);
+
+ switch (optname) {
+ case ICMP_FILTER:
+ if (sk->num != IPPROTO_ICMP)
+ return -EOPNOTSUPP;
+ return raw_geticmpfilter(sk, optval, optlen);
+ };
+
+ return -ENOPROTOOPT;
+}
+
+struct proto raw_prot = {
+ (struct sock *)&raw_prot, /* sklist_next */
+ (struct sock *)&raw_prot, /* sklist_prev */
+ raw_close, /* close */
+ udp_connect, /* connect */
+ NULL, /* accept */
+ NULL, /* retransmit */
+ NULL, /* write_wakeup */
+ NULL, /* read_wakeup */
+ datagram_poll, /* poll */
+#ifdef CONFIG_IP_MROUTE
+ ipmr_ioctl, /* ioctl */
+#else
+ NULL, /* ioctl */
+#endif
+ raw_init, /* init */
+ NULL, /* destroy */
+ NULL, /* shutdown */
+ raw_setsockopt, /* setsockopt */
+ raw_getsockopt, /* getsockopt */
+ raw_sendmsg, /* sendmsg */
+ raw_recvmsg, /* recvmsg */
+ raw_bind, /* bind */
+ raw_rcv_skb, /* backlog_rcv */
+ raw_v4_hash, /* hash */
+ raw_v4_unhash, /* unhash */
+ NULL, /* get_port */
+ 128, /* max_header */
+ 0, /* retransmits */
+ "RAW", /* name */
+ 0, /* inuse */
+ 0 /* highestinuse */
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-06 15:34:11 +0000