Messages in this thread | | | Date | Wed, 16 Aug 2023 13:50:17 +0200 | From | Simon Horman <> | Subject | Re: [PATCH v10 net-next 08/23] net/tcp: Add AO sign to RST packets |
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On Tue, Aug 15, 2023 at 08:14:37PM +0100, Dmitry Safonov wrote: > Wire up sending resets to TCP-AO hashing. > > 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>
> --- > include/net/tcp_ao.h | 12 +++++ > net/ipv4/tcp_ao.c | 104 ++++++++++++++++++++++++++++++++++++++++++- > net/ipv4/tcp_ipv4.c | 69 ++++++++++++++++++++++------ > net/ipv6/tcp_ipv6.c | 70 ++++++++++++++++++++++------- > 4 files changed, 225 insertions(+), 30 deletions(-) > > diff --git a/include/net/tcp_ao.h b/include/net/tcp_ao.h > index e685ad9db949..67f997aabd9c 100644 > --- a/include/net/tcp_ao.h > +++ b/include/net/tcp_ao.h > @@ -117,12 +117,24 @@ int tcp_ao_hash_skb(unsigned short int family, > const u8 *tkey, int hash_offset, u32 sne); > int tcp_parse_ao(struct sock *sk, int cmd, unsigned short int family, > sockptr_t optval, int optlen); > +struct tcp_ao_key *tcp_ao_established_key(struct tcp_ao_info *ao, > + int sndid, int rcvid); > int tcp_ao_calc_traffic_key(struct tcp_ao_key *mkt, u8 *key, void *ctx, > unsigned int len, struct tcp_sigpool *hp); > void tcp_ao_destroy_sock(struct sock *sk); > struct tcp_ao_key *tcp_ao_do_lookup(const struct sock *sk, > const union tcp_ao_addr *addr, > int family, int sndid, int rcvid); > +int tcp_ao_hash_hdr(unsigned short family, char *ao_hash, > + struct tcp_ao_key *key, const u8 *tkey, > + const union tcp_ao_addr *daddr, > + const union tcp_ao_addr *saddr, > + const struct tcphdr *th, u32 sne); > +int tcp_ao_prepare_reset(const struct sock *sk, struct sk_buff *skb, > + const struct tcp_ao_hdr *aoh, int l3index, u32 seq, > + struct tcp_ao_key **key, char **traffic_key, > + bool *allocated_traffic_key, u8 *keyid, u32 *sne); > + > /* ipv4 specific functions */ > int tcp_v4_parse_ao(struct sock *sk, int cmd, sockptr_t optval, int optlen); > struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, > diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c
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> @@ -435,6 +495,46 @@ struct tcp_ao_key *tcp_v4_ao_lookup(const struct sock *sk, struct sock *addr_sk, > return tcp_ao_do_lookup(sk, addr, AF_INET, sndid, rcvid); > } > > +int tcp_ao_prepare_reset(const struct sock *sk, struct sk_buff *skb, > + const struct tcp_ao_hdr *aoh, int l3index, u32 seq, > + struct tcp_ao_key **key, char **traffic_key, > + bool *allocated_traffic_key, u8 *keyid, u32 *sne) > +{ > + struct tcp_ao_info *ao_info; > + > + *allocated_traffic_key = false; > + /* If there's no socket - than initial sisn/disn are unknown. > + * Drop the segment. RFC5925 (7.7) advises to require graceful > + * restart [RFC4724]. Alternatively, the RFC5925 advises to > + * save/restore traffic keys before/after reboot. > + * Linux TCP-AO support provides TCP_AO_ADD_KEY and TCP_AO_REPAIR > + * options to restore a socket post-reboot. > + */ > + if (!sk) > + return -ENOTCONN; > + > + if ((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_NEW_SYN_RECV)) { > + return -1; > + } else { > + struct tcp_ao_key *rnext_key; > + > + if (sk->sk_state == TCP_TIME_WAIT) > + return -1; > + ao_info = rcu_dereference(tcp_sk(sk)->ao_info); > + if (!ao_info) > + return -ENOENT; > + > + *key = tcp_ao_established_key(ao_info, aoh->rnext_keyid, -1); > + if (!*key) > + return -ENOENT; > + *traffic_key = snd_other_key(*key); > + rnext_key = READ_ONCE(ao_info->rnext_key); > + *keyid = rnext_key->rcvid; > + *sne = 0; > + } > + return 0; > +} > + > static int tcp_ao_cache_traffic_keys(const struct sock *sk, > struct tcp_ao_info *ao, > struct tcp_ao_key *ao_key) > diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c > index 31169971cc56..f07a12f478d4 100644 > --- a/net/ipv4/tcp_ipv4.c > +++ b/net/ipv4/tcp_ipv4.c > @@ -657,6 +657,52 @@ void tcp_v4_send_check(struct sock *sk, struct sk_buff *skb) > } > EXPORT_SYMBOL(tcp_v4_send_check); > > +#define REPLY_OPTIONS_LEN (MAX_TCP_OPTION_SPACE / sizeof(__be32)) > + > +static bool tcp_v4_ao_sign_reset(const struct sock *sk, struct sk_buff *skb, > + const struct tcp_ao_hdr *aoh, > + struct ip_reply_arg *arg, struct tcphdr *reply, > + __be32 reply_options[REPLY_OPTIONS_LEN]) > +{ > +#ifdef CONFIG_TCP_AO > + int sdif = tcp_v4_sdif(skb); > + int dif = inet_iif(skb); > + int l3index = sdif ? dif : 0; > + bool allocated_traffic_key; > + struct tcp_ao_key *key; > + char *traffic_key; > + bool drop = true; > + u32 ao_sne = 0; > + u8 keyid; > + > + rcu_read_lock(); > + if (tcp_ao_prepare_reset(sk, skb, aoh, l3index, reply->seq, > + &key, &traffic_key, &allocated_traffic_key, > + &keyid, &ao_sne))
Hi Dmitry,
The type of the 4th parameter of tcp_ao_prepare_reset() (seq) is u32, but here a __be32 value is passed.
Also, it seems that parameter is unused by tcp_ao_prepare_reset().
> + goto out; > + > + reply_options[0] = htonl((TCPOPT_AO << 24) | (tcp_ao_len(key) << 16) | > + (aoh->rnext_keyid << 8) | keyid); > + arg->iov[0].iov_len += round_up(tcp_ao_len(key), 4); > + reply->doff = arg->iov[0].iov_len / 4; > + > + if (tcp_ao_hash_hdr(AF_INET, (char *)&reply_options[1], > + key, traffic_key, > + (union tcp_ao_addr *)&ip_hdr(skb)->saddr, > + (union tcp_ao_addr *)&ip_hdr(skb)->daddr, > + reply, ao_sne)) > + goto out; > + drop = false; > +out: > + rcu_read_unlock(); > + if (allocated_traffic_key) > + kfree(traffic_key); > + return drop; > +#else > + return true; > +#endif > +} > + > /* > * This routine will send an RST to the other tcp. > *
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> diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
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> @@ -1064,6 +1088,19 @@ static void tcp_v6_send_reset(const struct sock *sk, struct sk_buff *skb) > ack_seq = ntohl(th->seq) + th->syn + th->fin + skb->len - > (th->doff << 2); > > +#ifdef CONFIG_TCP_AO > + if (aoh) { > + int l3index; > + > + l3index = tcp_v6_sdif(skb) ? tcp_v6_iif_l3_slave(skb) : 0; > + if (tcp_ao_prepare_reset(sk, skb, aoh, l3index, htonl(seq),
Ditto.
> + &ao_key, &traffic_key, > + &allocated_traffic_key, > + &rcv_next, &ao_sne)) > + goto out; > + } > +#endif > + > if (sk) { > oif = sk->sk_bound_dev_if; > if (sk_fullsock(sk)) {
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