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tcp: Add l3index to tcp_md5sig_key and md5 functions 

Add l3index to tcp_md5sig_key to represent the L3 domain of a key, and
add l3index to tcp_md5_do_add and tcp_md5_do_del to fill in the key.

With the key now based on an l3index, add the new parameter to the
lookup functions and consider the l3index when looking for a match.

The l3index comes from the skb when processing ingress packets leveraging
the helpers created for socket lookups, tcp_v4_sdif and inet_iif (and the
v6 variants). When the sdif index is set it means the packet ingressed a
device that is part of an L3 domain and inet_iif points to the VRF device.
For egress, the L3 domain is determined from the socket binding and
sk_bound_dev_if.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-12-30 14:14:28 -08:00 committed by David S. Miller
parent 534322ca3d
commit dea53bb80e
3 changed files with 113 additions and 51 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
include/net/tcp.h
View File

@ -1532,8 +1532,9 @@ struct tcp_md5sig_key {
struct hlist_node node;
u8 keylen;
u8 family; /* AF_INET or AF_INET6 */
union tcp_md5_addr addr;
u8 prefixlen;
union tcp_md5_addr addr;
int l3index; /* set if key added with L3 scope */
u8 key[TCP_MD5SIG_MAXKEYLEN];
struct rcu_head rcu;
};
@ -1577,34 +1578,33 @@ struct tcp_md5sig_pool {
int tcp_v4_md5_hash_skb(char *md5_hash, const struct tcp_md5sig_key *key,
const struct sock *sk, const struct sk_buff *skb);
int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
int family, u8 prefixlen, const u8 *newkey, u8 newkeylen,
gfp_t gfp);
int family, u8 prefixlen, int l3index,
const u8 *newkey, u8 newkeylen, gfp_t gfp);
int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr,
int family, u8 prefixlen);
int family, u8 prefixlen, int l3index);
struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
const struct sock *addr_sk);
#ifdef CONFIG_TCP_MD5SIG
#include <linux/jump_label.h>
extern struct static_key_false tcp_md5_needed;
struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk,
struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr,
int family);
static inline struct tcp_md5sig_key *
tcp_md5_do_lookup(const struct sock *sk,
const union tcp_md5_addr *addr,
int family)
tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr, int family)
{
if (!static_branch_unlikely(&tcp_md5_needed))
return NULL;
return __tcp_md5_do_lookup(sk, addr, family);
return __tcp_md5_do_lookup(sk, l3index, addr, family);
}
#define tcp_twsk_md5_key(twsk) ((twsk)->tw_md5_key)
#else
static inline struct tcp_md5sig_key *tcp_md5_do_lookup(const struct sock *sk,
const union tcp_md5_addr *addr,
int family)
static inline struct tcp_md5sig_key *
tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr, int family)
{
return NULL;
}

68
net/ipv4/tcp_ipv4.c
View File

@ -702,13 +702,19 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
const union tcp_md5_addr *addr;
int l3index;
/* sdif set, means packet ingressed via a device
* in an L3 domain and inet_iif is set to it.
*/
l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
key = tcp_md5_do_lookup(sk, addr, AF_INET);
key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
} else if (hash_location) {
const union tcp_md5_addr *addr;
int sdif = tcp_v4_sdif(skb);
int dif = inet_iif(skb);
int l3index;
/*
* active side is lost. Try to find listening socket through
@ -725,8 +731,12 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
if (!sk1)
goto out;
/* sdif set, means packet ingressed via a device
* in an L3 domain and dif is set to it.
*/
l3index = sdif ? dif : 0;
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
key = tcp_md5_do_lookup(sk1, addr, AF_INET);
key = tcp_md5_do_lookup(sk1, l3index, addr, AF_INET);
if (!key)
goto out;
@ -911,6 +921,7 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
const union tcp_md5_addr *addr;
int l3index;
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
@ -924,13 +935,14 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
* Rcv.Wind.Shift bits:
*/
addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
tcp_v4_send_ack(sk, skb, seq,
tcp_rsk(req)->rcv_nxt,
req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
req->ts_recent,
0,
tcp_md5_do_lookup(sk, addr, AF_INET),
tcp_md5_do_lookup(sk, l3index, addr, AF_INET),
inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
ip_hdr(skb)->tos);
}
@ -990,7 +1002,7 @@ DEFINE_STATIC_KEY_FALSE(tcp_md5_needed);
EXPORT_SYMBOL(tcp_md5_needed);
/* Find the Key structure for an address. */
struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk,
struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk, int l3index,
const union tcp_md5_addr *addr,
int family)
{
@ -1010,7 +1022,8 @@ struct tcp_md5sig_key *__tcp_md5_do_lookup(const struct sock *sk,
hlist_for_each_entry_rcu(key, &md5sig->head, node) {
if (key->family != family)
continue;
if (key->l3index && key->l3index != l3index)
continue;
if (family == AF_INET) {
mask = inet_make_mask(key->prefixlen);
match = (key->addr.a4.s_addr & mask) ==
@ -1034,7 +1047,8 @@ EXPORT_SYMBOL(__tcp_md5_do_lookup);
static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk,
const union tcp_md5_addr *addr,
int family, u8 prefixlen)
int family, u8 prefixlen,
int l3index)
{
const struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_key *key;
@ -1053,6 +1067,8 @@ static struct tcp_md5sig_key *tcp_md5_do_lookup_exact(const struct sock *sk,
hlist_for_each_entry_rcu(key, &md5sig->head, node) {
if (key->family != family)
continue;
if (key->l3index && key->l3index != l3index)
continue;
if (!memcmp(&key->addr, addr, size) &&
key->prefixlen == prefixlen)
return key;
@ -1064,23 +1080,26 @@ struct tcp_md5sig_key *tcp_v4_md5_lookup(const struct sock *sk,
const struct sock *addr_sk)
{
const union tcp_md5_addr *addr;
int l3index;
l3index = l3mdev_master_ifindex_by_index(sock_net(sk),
addr_sk->sk_bound_dev_if);
addr = (const union tcp_md5_addr *)&addr_sk->sk_daddr;
return tcp_md5_do_lookup(sk, addr, AF_INET);
return tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
}
EXPORT_SYMBOL(tcp_v4_md5_lookup);
/* This can be called on a newly created socket, from other files */
int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
int family, u8 prefixlen, const u8 *newkey, u8 newkeylen,
gfp_t gfp)
int family, u8 prefixlen, int l3index,
const u8 *newkey, u8 newkeylen, gfp_t gfp)
{
/* Add Key to the list */
struct tcp_md5sig_key *key;
struct tcp_sock *tp = tcp_sk(sk);
struct tcp_md5sig_info *md5sig;
key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen);
key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen, l3index);
if (key) {
/* Pre-existing entry - just update that one. */
memcpy(key->key, newkey, newkeylen);
@ -1112,6 +1131,7 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
key->keylen = newkeylen;
key->family = family;
key->prefixlen = prefixlen;
key->l3index = l3index;
memcpy(&key->addr, addr,
(family == AF_INET6) ? sizeof(struct in6_addr) :
sizeof(struct in_addr));
@ -1121,11 +1141,11 @@ int tcp_md5_do_add(struct sock *sk, const union tcp_md5_addr *addr,
EXPORT_SYMBOL(tcp_md5_do_add);
int tcp_md5_do_del(struct sock *sk, const union tcp_md5_addr *addr, int family,
u8 prefixlen)
u8 prefixlen, int l3index)
{
struct tcp_md5sig_key *key;
key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen);
key = tcp_md5_do_lookup_exact(sk, addr, family, prefixlen, l3index);
if (!key)
return -ENOENT;
hlist_del_rcu(&key->node);
@ -1158,6 +1178,7 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
struct sockaddr_in *sin = (struct sockaddr_in *)&cmd.tcpm_addr;
const union tcp_md5_addr *addr;
u8 prefixlen = 32;
int l3index = 0;
if (optlen < sizeof(cmd))
return -EINVAL;
@ -1178,12 +1199,12 @@ static int tcp_v4_parse_md5_keys(struct sock *sk, int optname,
addr = (union tcp_md5_addr *)&sin->sin_addr.s_addr;
if (!cmd.tcpm_keylen)
return tcp_md5_do_del(sk, addr, AF_INET, prefixlen);
return tcp_md5_do_del(sk, addr, AF_INET, prefixlen, l3index);
if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
return -EINVAL;
return tcp_md5_do_add(sk, addr, AF_INET, prefixlen,
return tcp_md5_do_add(sk, addr, AF_INET, prefixlen, l3index,
cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
}
@ -1311,11 +1332,16 @@ static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
const struct iphdr *iph = ip_hdr(skb);
const struct tcphdr *th = tcp_hdr(skb);
const union tcp_md5_addr *addr;
int genhash;
unsigned char newhash[16];
int genhash, l3index;
/* sdif set, means packet ingressed via a device
* in an L3 domain and dif is set to the l3mdev
*/
l3index = sdif ? dif : 0;
addr = (union tcp_md5_addr *)&iph->saddr;
hash_expected = tcp_md5_do_lookup(sk, addr, AF_INET);
hash_expected = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
hash_location = tcp_parse_md5sig_option(th);
/* We've parsed the options - do we have a hash? */
@ -1341,11 +1367,11 @@ static bool tcp_v4_inbound_md5_hash(const struct sock *sk,
if (genhash || memcmp(hash_location, newhash, 16) != 0) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s\n",
net_info_ratelimited("MD5 Hash failed for (%pI4, %d)->(%pI4, %d)%s L3 index %d\n",
&iph->saddr, ntohs(th->source),
&iph->daddr, ntohs(th->dest),
genhash ? " tcp_v4_calc_md5_hash failed"
: "");
: "", l3index);
return true;
}
return false;
@ -1431,6 +1457,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
#ifdef CONFIG_TCP_MD5SIG
const union tcp_md5_addr *addr;
struct tcp_md5sig_key *key;
int l3index;
#endif
struct ip_options_rcu *inet_opt;
@ -1478,9 +1505,10 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
tcp_initialize_rcv_mss(newsk);
#ifdef CONFIG_TCP_MD5SIG
l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
/* Copy over the MD5 key from the original socket */
addr = (union tcp_md5_addr *)&newinet->inet_daddr;
key = tcp_md5_do_lookup(sk, addr, AF_INET);
key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
if (key) {
/*
* We're using one, so create a matching key
@ -1488,7 +1516,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
* memory, then we end up not copying the key
* across. Shucks.
*/
tcp_md5_do_add(newsk, addr, AF_INET, 32,
tcp_md5_do_add(newsk, addr, AF_INET, 32, l3index,
key->key, key->keylen, GFP_ATOMIC);
sk_nocaps_add(newsk, NETIF_F_GSO_MASK);
}

72
net/ipv6/tcp_ipv6.c
View File

@ -81,7 +81,8 @@ static const struct tcp_sock_af_ops tcp_sock_ipv6_specific;
static const struct tcp_sock_af_ops tcp_sock_ipv6_mapped_specific;
#else
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
const struct in6_addr *addr)
const struct in6_addr *addr,
int l3index)
{
return NULL;
}
@ -532,15 +533,22 @@ static void tcp_v6_reqsk_destructor(struct request_sock *req)
#ifdef CONFIG_TCP_MD5SIG
static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
const struct in6_addr *addr)
const struct in6_addr *addr,
int l3index)
{
return tcp_md5_do_lookup(sk, (union tcp_md5_addr *)addr, AF_INET6);
return tcp_md5_do_lookup(sk, l3index,
(union tcp_md5_addr *)addr, AF_INET6);
}
static struct tcp_md5sig_key *tcp_v6_md5_lookup(const struct sock *sk,
const struct sock *addr_sk)
{
return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr);
int l3index;
l3index = l3mdev_master_ifindex_by_index(sock_net(sk),
addr_sk->sk_bound_dev_if);
return tcp_v6_md5_do_lookup(sk, &addr_sk->sk_v6_daddr,
l3index);
}
static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
@ -548,6 +556,7 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
{
struct tcp_md5sig cmd;
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)&cmd.tcpm_addr;
int l3index = 0;
u8 prefixlen;
if (optlen < sizeof(cmd))
@ -572,9 +581,9 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
if (!cmd.tcpm_keylen) {
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
AF_INET, prefixlen);
AF_INET, prefixlen, l3index);
return tcp_md5_do_del(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
AF_INET6, prefixlen);
AF_INET6, prefixlen, l3index);
}
if (cmd.tcpm_keylen > TCP_MD5SIG_MAXKEYLEN)
@ -582,12 +591,13 @@ static int tcp_v6_parse_md5_keys(struct sock *sk, int optname,
if (ipv6_addr_v4mapped(&sin6->sin6_addr))
return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr.s6_addr32[3],
AF_INET, prefixlen, cmd.tcpm_key,
cmd.tcpm_keylen, GFP_KERNEL);
AF_INET, prefixlen, l3index,
cmd.tcpm_key, cmd.tcpm_keylen,
GFP_KERNEL);
return tcp_md5_do_add(sk, (union tcp_md5_addr *)&sin6->sin6_addr,
AF_INET6, prefixlen, cmd.tcpm_key,
cmd.tcpm_keylen, GFP_KERNEL);
AF_INET6, prefixlen, l3index,
cmd.tcpm_key, cmd.tcpm_keylen, GFP_KERNEL);
}
static int tcp_v6_md5_hash_headers(struct tcp_md5sig_pool *hp,
@ -706,10 +716,15 @@ static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
struct tcp_md5sig_key *hash_expected;
const struct ipv6hdr *ip6h = ipv6_hdr(skb);
const struct tcphdr *th = tcp_hdr(skb);
int genhash;
int genhash, l3index;
u8 newhash[16];
hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr);
/* sdif set, means packet ingressed via a device
* in an L3 domain and dif is set to the l3mdev
*/
l3index = sdif ? dif : 0;
hash_expected = tcp_v6_md5_do_lookup(sk, &ip6h->saddr, l3index);
hash_location = tcp_parse_md5sig_option(th);
/* We've parsed the options - do we have a hash? */
@ -733,10 +748,10 @@ static bool tcp_v6_inbound_md5_hash(const struct sock *sk,
if (genhash || memcmp(hash_location, newhash, 16) != 0) {
NET_INC_STATS(sock_net(sk), LINUX_MIB_TCPMD5FAILURE);
net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u\n",
net_info_ratelimited("MD5 Hash %s for [%pI6c]:%u->[%pI6c]:%u L3 index %d\n",
genhash ? "failed" : "mismatch",
&ip6h->saddr, ntohs(th->source),
&ip6h->daddr, ntohs(th->dest));
&ip6h->daddr, ntohs(th->dest), l3index);
return true;
}
#endif
@ -952,10 +967,17 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
rcu_read_lock();
hash_location = tcp_parse_md5sig_option(th);
if (sk && sk_fullsock(sk)) {
key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr);
int l3index;
/* sdif set, means packet ingressed via a device
* in an L3 domain and inet_iif is set to it.
*/
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
key = tcp_v6_md5_do_lookup(sk, &ipv6h->saddr, l3index);
} else if (hash_location) {
int dif = tcp_v6_iif_l3_slave(skb);
int sdif = tcp_v6_sdif(skb);
int l3index;
/*
* active side is lost. Try to find listening socket through
@ -972,7 +994,12 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
if (!sk1)
goto out;
key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr);
/* sdif set, means packet ingressed via a device
* in an L3 domain and dif is set to it.
*/
l3index = tcp_v6_sdif(skb) ? dif : 0;
key = tcp_v6_md5_do_lookup(sk1, &ipv6h->saddr, l3index);
if (!key)
goto out;
@ -1042,6 +1069,10 @@ static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
struct request_sock *req)
{
int l3index;
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
*/
@ -1056,7 +1087,7 @@ static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
tcp_time_stamp_raw() + tcp_rsk(req)->ts_off,
req->ts_recent, sk->sk_bound_dev_if,
tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr),
tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index),
0, 0, sk->sk_priority);
}
@ -1128,6 +1159,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
struct sock *newsk;
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *key;
int l3index;
#endif
struct flowi6 fl6;
@ -1271,8 +1303,10 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
newinet->inet_rcv_saddr = LOOPBACK4_IPV6;
#ifdef CONFIG_TCP_MD5SIG
l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif);
/* Copy over the MD5 key from the original socket */
key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr);
key = tcp_v6_md5_do_lookup(sk, &newsk->sk_v6_daddr, l3index);
if (key) {
/* We're using one, so create a matching key
* on the newsk structure. If we fail to get
@ -1280,7 +1314,7 @@ static struct sock *tcp_v6_syn_recv_sock(const struct sock *sk, struct sk_buff *
* across. Shucks.
*/
tcp_md5_do_add(newsk, (union tcp_md5_addr *)&newsk->sk_v6_daddr,
AF_INET6, 128, key->key, key->keylen,
AF_INET6, 128, l3index, key->key, key->keylen,
sk_gfp_mask(sk, GFP_ATOMIC));
}
#endif