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synced 2024-09-06 09:51:23 +00:00
net/tcp: Add TCP-AO sign to twsk
Add support for sockets in time-wait state. ao_info as well as all keys are inherited on transition to time-wait socket. The lifetime of ao_info is now protected by ref counter, so that tcp_ao_destroy_sock() will destruct it only when the last user is gone. Co-developed-by: Francesco Ruggeri <fruggeri@arista.com> Signed-off-by: Francesco Ruggeri <fruggeri@arista.com> Co-developed-by: Salam Noureddine <noureddine@arista.com> Signed-off-by: Salam Noureddine <noureddine@arista.com> Signed-off-by: Dmitry Safonov <dima@arista.com> Acked-by: David Ahern <dsahern@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dmitry Safonov
David S. Miller
parent
ba7783ad45
commit
decde2586b
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@ -514,6 +514,9 @@ struct tcp_timewait_sock {
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#ifdef CONFIG_TCP_MD5SIG
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struct tcp_md5sig_key *tw_md5_key;
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#endif
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#ifdef CONFIG_TCP_AO
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struct tcp_ao_info __rcu *ao_info;
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#endif
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};
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static inline struct tcp_timewait_sock *tcp_twsk(const struct sock *sk)
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@ -85,6 +85,7 @@ struct tcp_ao_info {
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__unused :31;
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__be32 lisn;
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__be32 risn;
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refcount_t refcnt; /* Protects twsk destruction */
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struct rcu_head rcu;
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};
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@ -124,7 +125,8 @@ struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao,
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int sndid, int rcvid);
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int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx,
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unsigned int len, struct tcp_sigpool *hp);
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void tcp_ao_destroy_sock(struct sock *sk);
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void tcp_ao_destroy_sock(struct sock *sk, bool twsk);
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void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp);
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struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
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const union tcp_ao_addr *addr,
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int family, int sndid, int rcvid);
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@ -182,7 +184,7 @@ static inline struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk,
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return NULL;
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}
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static inline void tcp_ao_destroy_sock(struct sock *sk)
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static inline void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
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{
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}
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@ -194,6 +196,11 @@ static inline void tcp_ao_finish_connect(struct sock *sk, struct sk_buff *skb)
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{
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}
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static inline void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw,
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struct tcp_sock *tp)
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{
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}
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static inline void tcp_ao_connect_init(struct sock *sk)
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{
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}
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@ -159,6 +159,7 @@ static struct tcp_ao_info *tcp_ao_alloc_info(gfp_t flags)
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if (!ao)
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return NULL;
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INIT_HLIST_HEAD(&ao->head);
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refcount_set(&ao->refcnt, 1);
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return ao;
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}
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@ -176,27 +177,54 @@ static void tcp_ao_key_free_rcu(struct rcu_head *head)
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kfree_sensitive(key);
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}
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void tcp_ao_destroy_sock(struct sock *sk)
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void tcp_ao_destroy_sock(struct sock *sk, bool twsk)
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{
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struct tcp_ao_info *ao;
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struct tcp_ao_key *key;
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struct hlist_node *n;
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ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1);
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tcp_sk(sk)->ao_info = NULL;
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if (twsk) {
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ao = rcu_dereference_protected(tcp_twsk(sk)->ao_info, 1);
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tcp_twsk(sk)->ao_info = NULL;
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} else {
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ao = rcu_dereference_protected(tcp_sk(sk)->ao_info, 1);
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tcp_sk(sk)->ao_info = NULL;
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}
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if (!ao)
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if (!ao || !refcount_dec_and_test(&ao->refcnt))
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return;
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hlist_for_each_entry_safe(key, n, &ao->head, node) {
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hlist_del_rcu(&key->node);
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atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
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if (!twsk)
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atomic_sub(tcp_ao_sizeof_key(key), &sk->sk_omem_alloc);
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call_rcu(&key->rcu, tcp_ao_key_free_rcu);
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}
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kfree_rcu(ao, rcu);
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}
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void tcp_ao_time_wait(struct tcp_timewait_sock *tcptw, struct tcp_sock *tp)
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{
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struct tcp_ao_info *ao_info = rcu_dereference_protected(tp->ao_info, 1);
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if (ao_info) {
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struct tcp_ao_key *key;
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struct hlist_node *n;
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int omem = 0;
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hlist_for_each_entry_safe(key, n, &ao_info->head, node) {
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omem += tcp_ao_sizeof_key(key);
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}
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refcount_inc(&ao_info->refcnt);
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atomic_sub(omem, &(((struct sock *)tp)->sk_omem_alloc));
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rcu_assign_pointer(tcptw->ao_info, ao_info);
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} else {
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tcptw->ao_info = NULL;
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}
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}
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/* 4 tuple and ISNs are expected in NBO */
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static int tcp_v4_ao_calc_key(struct tcp_ao_key *mkt, u8 *key,
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__be32 saddr, __be32 daddr,
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@ -514,11 +542,13 @@ int tcp_ao_prepare_reset(const struct sock *sk, struct sk_buff *skb,
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if (!sk)
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return -ENOTCONN;
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if ((1 << sk->sk_state) &
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(TCPF_LISTEN | TCPF_NEW_SYN_RECV | TCPF_TIME_WAIT))
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if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV)) {
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return -1;
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ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
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if (sk->sk_state == TCP_TIME_WAIT)
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ao_info = rcu_dereference(tcp_twsk(sk)->ao_info);
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else
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ao_info = rcu_dereference(tcp_sk(sk)->ao_info);
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if (!ao_info)
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return -ENOENT;
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@ -910,6 +940,9 @@ static struct tcp_ao_info *setsockopt_ao_info(struct sock *sk)
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if (sk_fullsock(sk)) {
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return rcu_dereference_protected(tcp_sk(sk)->ao_info,
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lockdep_sock_is_held(sk));
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} else if (sk->sk_state == TCP_TIME_WAIT) {
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return rcu_dereference_protected(tcp_twsk(sk)->ao_info,
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lockdep_sock_is_held(sk));
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}
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return ERR_PTR(-ESOCKTNOSUPPORT);
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}
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@ -911,17 +911,13 @@ static void tcp_v4_send_reset(const struct sock *sk, struct sk_buff *skb)
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static void tcp_v4_send_ack(const struct sock *sk,
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struct sk_buff *skb, u32 seq, u32 ack,
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u32 win, u32 tsval, u32 tsecr, int oif,
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struct tcp_md5sig_key *key,
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struct tcp_key *key,
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int reply_flags, u8 tos, u32 txhash)
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{
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const struct tcphdr *th = tcp_hdr(skb);
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struct {
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struct tcphdr th;
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__be32 opt[(TCPOLEN_TSTAMP_ALIGNED >> 2)
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#ifdef CONFIG_TCP_MD5SIG
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+ (TCPOLEN_MD5SIG_ALIGNED >> 2)
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#endif
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];
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__be32 opt[(MAX_TCP_OPTION_SPACE >> 2)];
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} rep;
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struct net *net = sock_net(sk);
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struct ip_reply_arg arg;
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@ -952,7 +948,7 @@ static void tcp_v4_send_ack(const struct sock *sk,
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rep.th.window = htons(win);
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#ifdef CONFIG_TCP_MD5SIG
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if (key) {
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if (tcp_key_is_md5(key)) {
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int offset = (tsecr) ? 3 : 0;
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rep.opt[offset++] = htonl((TCPOPT_NOP << 24) |
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@ -963,9 +959,27 @@ static void tcp_v4_send_ack(const struct sock *sk,
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rep.th.doff = arg.iov[0].iov_len/4;
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tcp_v4_md5_hash_hdr((__u8 *) &rep.opt[offset],
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key, ip_hdr(skb)->saddr,
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key->md5_key, ip_hdr(skb)->saddr,
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ip_hdr(skb)->daddr, &rep.th);
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}
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#endif
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#ifdef CONFIG_TCP_AO
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if (tcp_key_is_ao(key)) {
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int offset = (tsecr) ? 3 : 0;
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rep.opt[offset++] = htonl((TCPOPT_AO << 24) |
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(tcp_ao_len(key->ao_key) << 16) |
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(key->ao_key->sndid << 8) |
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key->rcv_next);
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arg.iov[0].iov_len += round_up(tcp_ao_len(key->ao_key), 4);
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rep.th.doff = arg.iov[0].iov_len / 4;
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tcp_ao_hash_hdr(AF_INET, (char *)&rep.opt[offset],
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key->ao_key, key->traffic_key,
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(union tcp_ao_addr *)&ip_hdr(skb)->saddr,
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(union tcp_ao_addr *)&ip_hdr(skb)->daddr,
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&rep.th, key->sne);
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}
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#endif
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arg.flags = reply_flags;
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arg.csum = csum_tcpudp_nofold(ip_hdr(skb)->daddr,
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@ -999,18 +1013,50 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
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{
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struct inet_timewait_sock *tw = inet_twsk(sk);
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struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
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struct tcp_key key = {};
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#ifdef CONFIG_TCP_AO
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struct tcp_ao_info *ao_info;
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/* FIXME: the segment to-be-acked is not verified yet */
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ao_info = rcu_dereference(tcptw->ao_info);
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if (ao_info) {
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const struct tcp_ao_hdr *aoh;
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if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh)) {
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inet_twsk_put(tw);
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return;
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}
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if (aoh)
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key.ao_key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1);
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}
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if (key.ao_key) {
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struct tcp_ao_key *rnext_key;
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key.traffic_key = snd_other_key(key.ao_key);
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rnext_key = READ_ONCE(ao_info->rnext_key);
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key.rcv_next = rnext_key->rcvid;
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key.type = TCP_KEY_AO;
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#else
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if (0) {
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#endif
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#ifdef CONFIG_TCP_MD5SIG
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} else if (static_branch_unlikely(&tcp_md5_needed.key)) {
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key.md5_key = tcp_twsk_md5_key(tcptw);
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if (key.md5_key)
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key.type = TCP_KEY_MD5;
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#endif
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}
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tcp_v4_send_ack(sk, skb,
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tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
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tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
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tcp_tw_tsval(tcptw),
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tcptw->tw_ts_recent,
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tw->tw_bound_dev_if,
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tcp_twsk_md5_key(tcptw),
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tw->tw_bound_dev_if, &key,
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tw->tw_transparent ? IP_REPLY_ARG_NOSRCCHECK : 0,
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tw->tw_tos,
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tw->tw_txhash
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);
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tw->tw_txhash);
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inet_twsk_put(tw);
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}
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@ -1018,8 +1064,7 @@ static void tcp_v4_timewait_ack(struct sock *sk, struct sk_buff *skb)
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static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
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struct request_sock *req)
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{
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const union tcp_md5_addr *addr;
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int l3index;
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struct tcp_key key = {};
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/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
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* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
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@ -1032,15 +1077,24 @@ static void tcp_v4_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
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* exception of <SYN> segments, MUST be right-shifted by
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* Rcv.Wind.Shift bits:
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*/
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addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
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l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
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#ifdef CONFIG_TCP_MD5SIG
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if (static_branch_unlikely(&tcp_md5_needed.key)) {
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const union tcp_md5_addr *addr;
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int l3index;
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addr = (union tcp_md5_addr *)&ip_hdr(skb)->saddr;
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l3index = tcp_v4_sdif(skb) ? inet_iif(skb) : 0;
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key.md5_key = tcp_md5_do_lookup(sk, l3index, addr, AF_INET);
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if (key.md5_key)
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key.type = TCP_KEY_MD5;
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}
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#endif
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tcp_v4_send_ack(sk, skb, seq,
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tcp_rsk(req)->rcv_nxt,
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req->rsk_rcv_wnd >> inet_rsk(req)->rcv_wscale,
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tcp_rsk_tsval(tcp_rsk(req)),
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READ_ONCE(req->ts_recent),
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0,
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tcp_md5_do_lookup(sk, l3index, addr, AF_INET),
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0, &key,
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inet_rsk(req)->no_srccheck ? IP_REPLY_ARG_NOSRCCHECK : 0,
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ip_hdr(skb)->tos,
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READ_ONCE(tcp_rsk(req)->txhash));
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@ -2404,7 +2458,7 @@ void tcp_v4_destroy_sock(struct sock *sk)
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rcu_assign_pointer(tp->md5sig_info, NULL);
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}
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#endif
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tcp_ao_destroy_sock(sk);
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tcp_ao_destroy_sock(sk, false);
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/* Clean up a referenced TCP bind bucket. */
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if (inet_csk(sk)->icsk_bind_hash)
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@ -279,7 +279,7 @@ static void tcp_time_wait_init(struct sock *sk, struct tcp_timewait_sock *tcptw)
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void tcp_time_wait(struct sock *sk, int state, int timeo)
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{
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const struct inet_connection_sock *icsk = inet_csk(sk);
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const struct tcp_sock *tp = tcp_sk(sk);
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struct tcp_sock *tp = tcp_sk(sk);
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struct net *net = sock_net(sk);
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struct inet_timewait_sock *tw;
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@ -316,6 +316,7 @@ void tcp_time_wait(struct sock *sk, int state, int timeo)
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#endif
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tcp_time_wait_init(sk, tcptw);
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tcp_ao_time_wait(tcptw, tp);
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/* Get the TIME_WAIT timeout firing. */
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if (timeo < rto)
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@ -370,6 +371,7 @@ void tcp_twsk_destructor(struct sock *sk)
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call_rcu(&twsk->tw_md5_key->rcu, tcp_md5_twsk_free_rcu);
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}
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#endif
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tcp_ao_destroy_sock(sk, true);
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}
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EXPORT_SYMBOL_GPL(tcp_twsk_destructor);
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@ -3997,7 +3997,7 @@ int tcp_connect(struct sock *sk)
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* then free up ao_info if allocated.
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*/
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if (needs_md5) {
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tcp_ao_destroy_sock(sk);
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tcp_ao_destroy_sock(sk, false);
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} else if (needs_ao) {
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tcp_clear_md5_list(sk);
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kfree(rcu_replace_pointer(tp->md5sig_info, NULL,
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@ -778,13 +778,6 @@ static int tcp_v6_md5_hash_skb(char *md5_hash,
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memset(md5_hash, 0, 16);
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return 1;
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}
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#else /* CONFIG_TCP_MD5SIG */
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static struct tcp_md5sig_key *tcp_v6_md5_do_lookup(const struct sock *sk,
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const struct in6_addr *addr,
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int l3index)
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{
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return NULL;
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}
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#endif
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static void tcp_v6_init_req(struct request_sock *req,
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@ -1134,39 +1127,81 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb)
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static void tcp_v6_send_ack(const struct sock *sk, struct sk_buff *skb, u32 seq,
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u32 ack, u32 win, u32 tsval, u32 tsecr, int oif,
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struct tcp_md5sig_key *md5_key, u8 tclass,
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struct tcp_key *key, u8 tclass,
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__be32 label, u32 priority, u32 txhash)
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{
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struct tcp_key key = {
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.md5_key = md5_key,
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.type = md5_key ? TCP_KEY_MD5 : TCP_KEY_NONE,
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};
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tcp_v6_send_response(sk, skb, seq, ack, win, tsval, tsecr, oif, 0,
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tclass, label, priority, txhash, &key);
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tclass, label, priority, txhash, key);
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}
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static void tcp_v6_timewait_ack(struct sock *sk, struct sk_buff *skb)
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{
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struct inet_timewait_sock *tw = inet_twsk(sk);
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struct tcp_timewait_sock *tcptw = tcp_twsk(sk);
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struct tcp_key key = {};
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#ifdef CONFIG_TCP_AO
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struct tcp_ao_info *ao_info;
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/* FIXME: the segment to-be-acked is not verified yet */
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ao_info = rcu_dereference(tcptw->ao_info);
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if (ao_info) {
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const struct tcp_ao_hdr *aoh;
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|
||||
/* Invalid TCP option size or twice included auth */
|
||||
if (tcp_parse_auth_options(tcp_hdr(skb), NULL, &aoh))
|
||||
goto out;
|
||||
if (aoh) {
|
||||
key.ao_key = tcp_ao_established_key(ao_info,
|
||||
aoh->rnext_keyid, -1);
|
||||
}
|
||||
}
|
||||
if (key.ao_key) {
|
||||
struct tcp_ao_key *rnext_key;
|
||||
|
||||
key.traffic_key = snd_other_key(key.ao_key);
|
||||
/* rcv_next switches to our rcv_next */
|
||||
rnext_key = READ_ONCE(ao_info->rnext_key);
|
||||
key.rcv_next = rnext_key->rcvid;
|
||||
key.type = TCP_KEY_AO;
|
||||
#else
|
||||
if (0) {
|
||||
#endif
|
||||
#ifdef CONFIG_TCP_MD5SIG
|
||||
} else if (static_branch_unlikely(&tcp_md5_needed.key)) {
|
||||
key.md5_key = tcp_twsk_md5_key(tcptw);
|
||||
if (key.md5_key)
|
||||
key.type = TCP_KEY_MD5;
|
||||
#endif
|
||||
}
|
||||
|
||||
tcp_v6_send_ack(sk, skb, tcptw->tw_snd_nxt, tcptw->tw_rcv_nxt,
|
||||
tcptw->tw_rcv_wnd >> tw->tw_rcv_wscale,
|
||||
tcp_tw_tsval(tcptw),
|
||||
tcptw->tw_ts_recent, tw->tw_bound_dev_if, tcp_twsk_md5_key(tcptw),
|
||||
tcptw->tw_ts_recent, tw->tw_bound_dev_if, &key,
|
||||
tw->tw_tclass, cpu_to_be32(tw->tw_flowlabel), tw->tw_priority,
|
||||
tw->tw_txhash);
|
||||
|
||||
#ifdef CONFIG_TCP_AO
|
||||
out:
|
||||
#endif
|
||||
inet_twsk_put(tw);
|
||||
}
|
||||
|
||||
static void tcp_v6_reqsk_send_ack(const struct sock *sk, struct sk_buff *skb,
|
||||
struct request_sock *req)
|
||||
{
|
||||
int l3index;
|
||||
struct tcp_key key = {};
|
||||
|
||||
l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
|
||||
#ifdef CONFIG_TCP_MD5SIG
|
||||
if (static_branch_unlikely(&tcp_md5_needed.key)) {
|
||||
int l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0;
|
||||
|
||||
key.md5_key = tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr,
|
||||
l3index);
|
||||
if (key.md5_key)
|
||||
key.type = TCP_KEY_MD5;
|
||||
}
|
||||
#endif
|
||||
|
||||
/* sk->sk_state == TCP_LISTEN -> for regular TCP_SYN_RECV
|
||||
* sk->sk_state == TCP_SYN_RECV -> for Fast Open.
|
||||
|
|
@ -1182,8 +1217,7 @@ 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_rsk_tsval(tcp_rsk(req)),
|
||||
READ_ONCE(req->ts_recent), sk->sk_bound_dev_if,
|
||||
tcp_v6_md5_do_lookup(sk, &ipv6_hdr(skb)->saddr, l3index),
|
||||
ipv6_get_dsfield(ipv6_hdr(skb)), 0,
|
||||
&key, ipv6_get_dsfield(ipv6_hdr(skb)), 0,
|
||||
READ_ONCE(sk->sk_priority),
|
||||
READ_ONCE(tcp_rsk(req)->txhash));
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue