#include <net/icmp.h>
#include <net/sock.h>
#include <net/inet_sock.h>
-#include <net/netfilter/nf_tproxy_core.h>
#include <net/netfilter/ipv4/nf_defrag_ipv4.h>
#if IS_ENABLED(CONFIG_IP6_NF_IPTABLES)
#define XT_SOCKET_HAVE_IPV6 1
#include <linux/netfilter_ipv6/ip6_tables.h>
+#include <net/inet6_hashtables.h>
#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
#endif
#include <net/netfilter/nf_conntrack.h>
#endif
-static void
-xt_socket_put_sk(struct sock *sk)
-{
- if (sk->sk_state == TCP_TIME_WAIT)
- inet_twsk_put(inet_twsk(sk));
- else
- sock_put(sk);
-}
-
static int
extract_icmp4_fields(const struct sk_buff *skb,
u8 *protocol,
return 0;
}
-static bool
-socket_match(const struct sk_buff *skb, struct xt_action_param *par,
- const struct xt_socket_mtinfo1 *info)
+/* "socket" match based redirection (no specific rule)
+ * ===================================================
+ *
+ * There are connections with dynamic endpoints (e.g. FTP data
+ * connection) that the user is unable to add explicit rules
+ * for. These are taken care of by a generic "socket" rule. It is
+ * assumed that the proxy application is trusted to open such
+ * connections without explicit iptables rule (except of course the
+ * generic 'socket' rule). In this case the following sockets are
+ * matched in preference order:
+ *
+ * - match: if there's a fully established connection matching the
+ * _packet_ tuple
+ *
+ * - match: if there's a non-zero bound listener (possibly with a
+ * non-local address) We don't accept zero-bound listeners, since
+ * then local services could intercept traffic going through the
+ * box.
+ */
+static struct sock *
+xt_socket_get_sock_v4(struct net *net, const u8 protocol,
+ const __be32 saddr, const __be32 daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in)
+{
+ switch (protocol) {
+ case IPPROTO_TCP:
+ return __inet_lookup(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ case IPPROTO_UDP:
+ return udp4_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ }
+ return NULL;
+}
+
+static bool xt_socket_sk_is_transparent(struct sock *sk)
+{
+ switch (sk->sk_state) {
+ case TCP_TIME_WAIT:
+ return inet_twsk(sk)->tw_transparent;
+
+ case TCP_NEW_SYN_RECV:
+ return inet_rsk(inet_reqsk(sk))->no_srccheck;
+
+ default:
+ return inet_sk(sk)->transparent;
+ }
+}
+
+struct sock *xt_socket_lookup_slow_v4(struct net *net,
+ const struct sk_buff *skb,
+ const struct net_device *indev)
{
const struct iphdr *iph = ip_hdr(skb);
- struct udphdr _hdr, *hp = NULL;
- struct sock *sk;
+ struct sock *sk = skb->sk;
__be32 uninitialized_var(daddr), uninitialized_var(saddr);
__be16 uninitialized_var(dport), uninitialized_var(sport);
u8 uninitialized_var(protocol);
#endif
if (iph->protocol == IPPROTO_UDP || iph->protocol == IPPROTO_TCP) {
+ struct udphdr _hdr, *hp;
+
hp = skb_header_pointer(skb, ip_hdrlen(skb),
sizeof(_hdr), &_hdr);
if (hp == NULL)
- return false;
+ return NULL;
protocol = iph->protocol;
saddr = iph->saddr;
} else if (iph->protocol == IPPROTO_ICMP) {
if (extract_icmp4_fields(skb, &protocol, &saddr, &daddr,
- &sport, &dport))
- return false;
+ &sport, &dport))
+ return NULL;
} else {
- return false;
+ return NULL;
}
#ifdef XT_SOCKET_HAVE_CONNTRACK
- /* Do the lookup with the original socket address in case this is a
- * reply packet of an established SNAT-ted connection. */
-
+ /* Do the lookup with the original socket address in
+ * case this is a reply packet of an established
+ * SNAT-ted connection.
+ */
ct = nf_ct_get(skb, &ctinfo);
if (ct && !nf_ct_is_untracked(ct) &&
((iph->protocol != IPPROTO_ICMP &&
}
#endif
- sk = nf_tproxy_get_sock_v4(dev_net(skb->dev), protocol,
- saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY);
- if (sk != NULL) {
+ if (sk)
+ atomic_inc(&sk->sk_refcnt);
+ else
+ sk = xt_socket_get_sock_v4(dev_net(skb->dev), protocol,
+ saddr, daddr, sport, dport,
+ indev);
+
+ return sk;
+}
+EXPORT_SYMBOL(xt_socket_lookup_slow_v4);
+
+static bool
+socket_match(const struct sk_buff *skb, struct xt_action_param *par,
+ const struct xt_socket_mtinfo1 *info)
+{
+ struct sk_buff *pskb = (struct sk_buff *)skb;
+ struct sock *sk = skb->sk;
+
+ if (!sk)
+ sk = xt_socket_lookup_slow_v4(par->net, skb, par->in);
+ if (sk) {
bool wildcard;
bool transparent = true;
- /* Ignore sockets listening on INADDR_ANY */
- wildcard = (sk->sk_state != TCP_TIME_WAIT &&
+ /* Ignore sockets listening on INADDR_ANY,
+ * unless XT_SOCKET_NOWILDCARD is set
+ */
+ wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
+ sk_fullsock(sk) &&
inet_sk(sk)->inet_rcv_saddr == 0);
/* Ignore non-transparent sockets,
- if XT_SOCKET_TRANSPARENT is used */
- if (info && info->flags & XT_SOCKET_TRANSPARENT)
- transparent = ((sk->sk_state != TCP_TIME_WAIT &&
- inet_sk(sk)->transparent) ||
- (sk->sk_state == TCP_TIME_WAIT &&
- inet_twsk(sk)->tw_transparent));
+ * if XT_SOCKET_TRANSPARENT is used
+ */
+ if (info->flags & XT_SOCKET_TRANSPARENT)
+ transparent = xt_socket_sk_is_transparent(sk);
+
+ if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
+ transparent)
+ pskb->mark = sk->sk_mark;
- xt_socket_put_sk(sk);
+ sock_gen_put(sk);
if (wildcard || !transparent)
sk = NULL;
}
- pr_debug("proto %hhu %pI4:%hu -> %pI4:%hu (orig %pI4:%hu) sock %p\n",
- protocol, &saddr, ntohs(sport),
- &daddr, ntohs(dport),
- &iph->daddr, hp ? ntohs(hp->dest) : 0, sk);
-
- return (sk != NULL);
+ return sk != NULL;
}
static bool
socket_mt4_v0(const struct sk_buff *skb, struct xt_action_param *par)
{
- return socket_match(skb, par, NULL);
+ static struct xt_socket_mtinfo1 xt_info_v0 = {
+ .flags = 0,
+ };
+
+ return socket_match(skb, par, &xt_info_v0);
}
static bool
-socket_mt4_v1(const struct sk_buff *skb, struct xt_action_param *par)
+socket_mt4_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
{
return socket_match(skb, par, par->matchinfo);
}
extract_icmp6_fields(const struct sk_buff *skb,
unsigned int outside_hdrlen,
int *protocol,
- struct in6_addr **raddr,
- struct in6_addr **laddr,
+ const struct in6_addr **raddr,
+ const struct in6_addr **laddr,
__be16 *rport,
- __be16 *lport)
+ __be16 *lport,
+ struct ipv6hdr *ipv6_var)
{
- struct ipv6hdr *inside_iph, _inside_iph;
+ const struct ipv6hdr *inside_iph;
struct icmp6hdr *icmph, _icmph;
__be16 *ports, _ports[2];
u8 inside_nexthdr;
if (icmph->icmp6_type & ICMPV6_INFOMSG_MASK)
return 1;
- inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph), sizeof(_inside_iph), &_inside_iph);
+ inside_iph = skb_header_pointer(skb, outside_hdrlen + sizeof(_icmph),
+ sizeof(*ipv6_var), ipv6_var);
if (inside_iph == NULL)
return 1;
inside_nexthdr = inside_iph->nexthdr;
- inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) + sizeof(_inside_iph),
+ inside_hdrlen = ipv6_skip_exthdr(skb, outside_hdrlen + sizeof(_icmph) +
+ sizeof(*ipv6_var),
&inside_nexthdr, &inside_fragoff);
if (inside_hdrlen < 0)
return 1; /* hjm: Packet has no/incomplete transport layer headers. */
return 0;
}
-static bool
-socket_mt6_v1(const struct sk_buff *skb, struct xt_action_param *par)
+static struct sock *
+xt_socket_get_sock_v6(struct net *net, const u8 protocol,
+ const struct in6_addr *saddr, const struct in6_addr *daddr,
+ const __be16 sport, const __be16 dport,
+ const struct net_device *in)
{
- struct ipv6hdr *iph = ipv6_hdr(skb);
- struct udphdr _hdr, *hp = NULL;
- struct sock *sk;
- struct in6_addr *daddr = NULL, *saddr = NULL;
+ switch (protocol) {
+ case IPPROTO_TCP:
+ return inet6_lookup(net, &tcp_hashinfo,
+ saddr, sport, daddr, dport,
+ in->ifindex);
+ case IPPROTO_UDP:
+ return udp6_lib_lookup(net, saddr, sport, daddr, dport,
+ in->ifindex);
+ }
+
+ return NULL;
+}
+
+struct sock *xt_socket_lookup_slow_v6(struct net *net,
+ const struct sk_buff *skb,
+ const struct net_device *indev)
+{
+ struct sock *sk = skb->sk;
__be16 uninitialized_var(dport), uninitialized_var(sport);
- int thoff = 0, uninitialized_var(tproto);
- const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
+ const struct in6_addr *daddr = NULL, *saddr = NULL;
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+ int thoff = 0, tproto;
tproto = ipv6_find_hdr(skb, &thoff, -1, NULL, NULL);
if (tproto < 0) {
pr_debug("unable to find transport header in IPv6 packet, dropping\n");
- return NF_DROP;
+ return NULL;
}
if (tproto == IPPROTO_UDP || tproto == IPPROTO_TCP) {
- hp = skb_header_pointer(skb, thoff,
- sizeof(_hdr), &_hdr);
+ struct udphdr _hdr, *hp;
+
+ hp = skb_header_pointer(skb, thoff, sizeof(_hdr), &_hdr);
if (hp == NULL)
- return false;
+ return NULL;
saddr = &iph->saddr;
sport = hp->source;
dport = hp->dest;
} else if (tproto == IPPROTO_ICMPV6) {
+ struct ipv6hdr ipv6_var;
+
if (extract_icmp6_fields(skb, thoff, &tproto, &saddr, &daddr,
- &sport, &dport))
- return false;
+ &sport, &dport, &ipv6_var))
+ return NULL;
} else {
- return false;
+ return NULL;
}
- sk = nf_tproxy_get_sock_v6(dev_net(skb->dev), tproto,
- saddr, daddr, sport, dport, par->in, NFT_LOOKUP_ANY);
- if (sk != NULL) {
+ if (sk)
+ atomic_inc(&sk->sk_refcnt);
+ else
+ sk = xt_socket_get_sock_v6(dev_net(skb->dev), tproto,
+ saddr, daddr, sport, dport,
+ indev);
+
+ return sk;
+}
+EXPORT_SYMBOL(xt_socket_lookup_slow_v6);
+
+static bool
+socket_mt6_v1_v2_v3(const struct sk_buff *skb, struct xt_action_param *par)
+{
+ const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
+ struct sk_buff *pskb = (struct sk_buff *)skb;
+ struct sock *sk = skb->sk;
+
+ if (!sk)
+ sk = xt_socket_lookup_slow_v6(par->net, skb, par->in);
+ if (sk) {
bool wildcard;
bool transparent = true;
- /* Ignore sockets listening on INADDR_ANY */
- wildcard = (sk->sk_state != TCP_TIME_WAIT &&
- ipv6_addr_any(&inet6_sk(sk)->rcv_saddr));
+ /* Ignore sockets listening on INADDR_ANY
+ * unless XT_SOCKET_NOWILDCARD is set
+ */
+ wildcard = (!(info->flags & XT_SOCKET_NOWILDCARD) &&
+ sk_fullsock(sk) &&
+ ipv6_addr_any(&sk->sk_v6_rcv_saddr));
/* Ignore non-transparent sockets,
- if XT_SOCKET_TRANSPARENT is used */
- if (info && info->flags & XT_SOCKET_TRANSPARENT)
- transparent = ((sk->sk_state != TCP_TIME_WAIT &&
- inet_sk(sk)->transparent) ||
- (sk->sk_state == TCP_TIME_WAIT &&
- inet_twsk(sk)->tw_transparent));
+ * if XT_SOCKET_TRANSPARENT is used
+ */
+ if (info->flags & XT_SOCKET_TRANSPARENT)
+ transparent = xt_socket_sk_is_transparent(sk);
- xt_socket_put_sk(sk);
+ if (info->flags & XT_SOCKET_RESTORESKMARK && !wildcard &&
+ transparent)
+ pskb->mark = sk->sk_mark;
+
+ if (sk != skb->sk)
+ sock_gen_put(sk);
if (wildcard || !transparent)
sk = NULL;
}
- pr_debug("proto %hhd %pI6:%hu -> %pI6:%hu "
- "(orig %pI6:%hu) sock %p\n",
- tproto, saddr, ntohs(sport),
- daddr, ntohs(dport),
- &iph->daddr, hp ? ntohs(hp->dest) : 0, sk);
-
- return (sk != NULL);
+ return sk != NULL;
}
#endif
+static int socket_mt_v1_check(const struct xt_mtchk_param *par)
+{
+ const struct xt_socket_mtinfo1 *info = (struct xt_socket_mtinfo1 *) par->matchinfo;
+
+ if (info->flags & ~XT_SOCKET_FLAGS_V1) {
+ pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V1);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int socket_mt_v2_check(const struct xt_mtchk_param *par)
+{
+ const struct xt_socket_mtinfo2 *info = (struct xt_socket_mtinfo2 *) par->matchinfo;
+
+ if (info->flags & ~XT_SOCKET_FLAGS_V2) {
+ pr_info("unknown flags 0x%x\n", info->flags & ~XT_SOCKET_FLAGS_V2);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static int socket_mt_v3_check(const struct xt_mtchk_param *par)
+{
+ const struct xt_socket_mtinfo3 *info =
+ (struct xt_socket_mtinfo3 *)par->matchinfo;
+
+ if (info->flags & ~XT_SOCKET_FLAGS_V3) {
+ pr_info("unknown flags 0x%x\n",
+ info->flags & ~XT_SOCKET_FLAGS_V3);
+ return -EINVAL;
+ }
+ return 0;
+}
+
static struct xt_match socket_mt_reg[] __read_mostly = {
{
.name = "socket",
.name = "socket",
.revision = 1,
.family = NFPROTO_IPV4,
- .match = socket_mt4_v1,
+ .match = socket_mt4_v1_v2_v3,
+ .checkentry = socket_mt_v1_check,
.matchsize = sizeof(struct xt_socket_mtinfo1),
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN),
.name = "socket",
.revision = 1,
.family = NFPROTO_IPV6,
- .match = socket_mt6_v1,
+ .match = socket_mt6_v1_v2_v3,
+ .checkentry = socket_mt_v1_check,
+ .matchsize = sizeof(struct xt_socket_mtinfo1),
+ .hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN),
+ .me = THIS_MODULE,
+ },
+#endif
+ {
+ .name = "socket",
+ .revision = 2,
+ .family = NFPROTO_IPV4,
+ .match = socket_mt4_v1_v2_v3,
+ .checkentry = socket_mt_v2_check,
+ .matchsize = sizeof(struct xt_socket_mtinfo1),
+ .hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN),
+ .me = THIS_MODULE,
+ },
+#ifdef XT_SOCKET_HAVE_IPV6
+ {
+ .name = "socket",
+ .revision = 2,
+ .family = NFPROTO_IPV6,
+ .match = socket_mt6_v1_v2_v3,
+ .checkentry = socket_mt_v2_check,
+ .matchsize = sizeof(struct xt_socket_mtinfo1),
+ .hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN),
+ .me = THIS_MODULE,
+ },
+#endif
+ {
+ .name = "socket",
+ .revision = 3,
+ .family = NFPROTO_IPV4,
+ .match = socket_mt4_v1_v2_v3,
+ .checkentry = socket_mt_v3_check,
+ .matchsize = sizeof(struct xt_socket_mtinfo1),
+ .hooks = (1 << NF_INET_PRE_ROUTING) |
+ (1 << NF_INET_LOCAL_IN),
+ .me = THIS_MODULE,
+ },
+#ifdef XT_SOCKET_HAVE_IPV6
+ {
+ .name = "socket",
+ .revision = 3,
+ .family = NFPROTO_IPV6,
+ .match = socket_mt6_v1_v2_v3,
+ .checkentry = socket_mt_v3_check,
.matchsize = sizeof(struct xt_socket_mtinfo1),
.hooks = (1 << NF_INET_PRE_ROUTING) |
(1 << NF_INET_LOCAL_IN),
projects / firefly-linux-kernel-4.4.55.git / blobdiff