aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4/ip_sockglue.c
diff options
context:
space:
mode:
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c72
1 files changed, 55 insertions, 17 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index 465abf0a9869..43c05854d752 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -48,6 +48,7 @@
#define IP_CMSG_RECVOPTS 8
#define IP_CMSG_RETOPTS 16
#define IP_CMSG_PASSSEC 32
+#define IP_CMSG_ORIGDSTADDR 64
/*
* SOL_IP control messages.
@@ -94,7 +95,7 @@ static void ip_cmsg_recv_opts(struct msghdr *msg, struct sk_buff *skb)
static void ip_cmsg_recv_retopts(struct msghdr *msg, struct sk_buff *skb)
{
unsigned char optbuf[sizeof(struct ip_options) + 40];
- struct ip_options * opt = (struct ip_options*)optbuf;
+ struct ip_options * opt = (struct ip_options *)optbuf;
if (IPCB(skb)->opt.optlen == 0)
return;
@@ -126,6 +127,27 @@ static void ip_cmsg_recv_security(struct msghdr *msg, struct sk_buff *skb)
security_release_secctx(secdata, seclen);
}
+static void ip_cmsg_recv_dstaddr(struct msghdr *msg, struct sk_buff *skb)
+{
+ struct sockaddr_in sin;
+ struct iphdr *iph = ip_hdr(skb);
+ __be16 *ports = (__be16 *)skb_transport_header(skb);
+
+ if (skb_transport_offset(skb) + 4 > skb->len)
+ return;
+
+ /* All current transport protocols have the port numbers in the
+ * first four bytes of the transport header and this function is
+ * written with this assumption in mind.
+ */
+
+ sin.sin_family = AF_INET;
+ sin.sin_addr.s_addr = iph->daddr;
+ sin.sin_port = ports[1];
+ memset(sin.sin_zero, 0, sizeof(sin.sin_zero));
+
+ put_cmsg(msg, SOL_IP, IP_ORIGDSTADDR, sizeof(sin), &sin);
+}
void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
{
@@ -160,6 +182,12 @@ void ip_cmsg_recv(struct msghdr *msg, struct sk_buff *skb)
if (flags & 1)
ip_cmsg_recv_security(msg, skb);
+
+ if ((flags>>=1) == 0)
+ return;
+ if (flags & 1)
+ ip_cmsg_recv_dstaddr(msg, skb);
+
}
int ip_cmsg_send(struct net *net, struct msghdr *msg, struct ipcm_cookie *ipc)
@@ -411,7 +439,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
int optname, char __user *optval, int optlen)
{
struct inet_sock *inet = inet_sk(sk);
- int val=0,err;
+ int val = 0, err;
if (((1<<optname) & ((1<<IP_PKTINFO) | (1<<IP_RECVTTL) |
(1<<IP_RECVOPTS) | (1<<IP_RECVTOS) |
@@ -421,7 +449,8 @@ static int do_ip_setsockopt(struct sock *sk, int level,
(1<<IP_ROUTER_ALERT) | (1<<IP_FREEBIND) |
(1<<IP_PASSSEC) | (1<<IP_TRANSPARENT))) ||
optname == IP_MULTICAST_TTL ||
- optname == IP_MULTICAST_LOOP) {
+ optname == IP_MULTICAST_LOOP ||
+ optname == IP_RECVORIGDSTADDR) {
if (optlen >= sizeof(int)) {
if (get_user(val, (int __user *) optval))
return -EFAULT;
@@ -437,7 +466,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
/* If optlen==0, it is equivalent to val == 0 */
if (ip_mroute_opt(optname))
- return ip_mroute_setsockopt(sk,optname,optval,optlen);
+ return ip_mroute_setsockopt(sk, optname, optval, optlen);
err = 0;
lock_sock(sk);
@@ -509,6 +538,12 @@ static int do_ip_setsockopt(struct sock *sk, int level,
else
inet->cmsg_flags &= ~IP_CMSG_PASSSEC;
break;
+ case IP_RECVORIGDSTADDR:
+ if (val)
+ inet->cmsg_flags |= IP_CMSG_ORIGDSTADDR;
+ else
+ inet->cmsg_flags &= ~IP_CMSG_ORIGDSTADDR;
+ break;
case IP_TOS: /* This sets both TOS and Precedence */
if (sk->sk_type == SOCK_STREAM) {
val &= ~3;
@@ -549,7 +584,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
goto e_inval;
if (optlen<1)
goto e_inval;
- if (val==-1)
+ if (val == -1)
val = 1;
if (val < 0 || val > 255)
goto e_inval;
@@ -573,12 +608,12 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -EFAULT;
if (optlen >= sizeof(struct ip_mreqn)) {
- if (copy_from_user(&mreq,optval,sizeof(mreq)))
+ 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)))
+ copy_from_user(&mreq.imr_address, optval, sizeof(struct in_addr)))
break;
}
@@ -626,11 +661,11 @@ static int do_ip_setsockopt(struct sock *sk, int level,
goto e_inval;
err = -EFAULT;
if (optlen >= sizeof(struct ip_mreqn)) {
- if (copy_from_user(&mreq,optval,sizeof(mreq)))
+ 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)))
+ if (copy_from_user(&mreq, optval, sizeof(struct ip_mreq)))
break;
}
@@ -808,7 +843,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
err = -ENOBUFS;
break;
}
- gsf = kmalloc(optlen,GFP_KERNEL);
+ gsf = kmalloc(optlen, GFP_KERNEL);
if (!gsf) {
err = -ENOBUFS;
break;
@@ -828,7 +863,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
goto mc_msf_out;
}
msize = IP_MSFILTER_SIZE(gsf->gf_numsrc);
- msf = kmalloc(msize,GFP_KERNEL);
+ msf = kmalloc(msize, GFP_KERNEL);
if (!msf) {
err = -ENOBUFS;
goto mc_msf_out;
@@ -971,9 +1006,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
return -EOPNOTSUPP;
if (ip_mroute_opt(optname))
- return ip_mroute_getsockopt(sk,optname,optval,optlen);
+ return ip_mroute_getsockopt(sk, optname, optval, optlen);
- if (get_user(len,optlen))
+ if (get_user(len, optlen))
return -EFAULT;
if (len < 0)
return -EINVAL;
@@ -984,7 +1019,7 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
case IP_OPTIONS:
{
unsigned char optbuf[sizeof(struct ip_options)+40];
- struct ip_options * opt = (struct ip_options*)optbuf;
+ struct ip_options * opt = (struct ip_options *)optbuf;
opt->optlen = 0;
if (inet->opt)
memcpy(optbuf, inet->opt,
@@ -1022,6 +1057,9 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
case IP_PASSSEC:
val = (inet->cmsg_flags & IP_CMSG_PASSSEC) != 0;
break;
+ case IP_RECVORIGDSTADDR:
+ val = (inet->cmsg_flags & IP_CMSG_ORIGDSTADDR) != 0;
+ break;
case IP_TOS:
val = inet->tos;
break;
@@ -1154,13 +1192,13 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
len = 1;
if (put_user(len, optlen))
return -EFAULT;
- if (copy_to_user(optval,&ucval,1))
+ 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))
+ if (copy_to_user(optval, &val, len))
return -EFAULT;
}
return 0;
@@ -1178,7 +1216,7 @@ int ip_getsockopt(struct sock *sk, int level,
!ip_mroute_opt(optname)) {
int len;
- if (get_user(len,optlen))
+ if (get_user(len, optlen))
return -EFAULT;
lock_sock(sk);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.