diff options
Diffstat (limited to 'net/ipv6/tcp_ao.c')
| -rw-r--r-- | net/ipv6/tcp_ao.c | 168 |
1 files changed, 168 insertions, 0 deletions
diff --git a/net/ipv6/tcp_ao.c b/net/ipv6/tcp_ao.c new file mode 100644 index 0000000000..3c09ac2620 --- /dev/null +++ b/net/ipv6/tcp_ao.c @@ -0,0 +1,168 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * INET An implementation of the TCP Authentication Option (TCP-AO). + * See RFC5925. + * + * Authors: Dmitry Safonov <dima@arista.com> + * Francesco Ruggeri <fruggeri@arista.com> + * Salam Noureddine <noureddine@arista.com> + */ +#include <crypto/hash.h> +#include <linux/tcp.h> + +#include <net/tcp.h> +#include <net/ipv6.h> + +static int tcp_v6_ao_calc_key(struct tcp_ao_key *mkt, u8 *key, + const struct in6_addr *saddr, + const struct in6_addr *daddr, + __be16 sport, __be16 dport, + __be32 sisn, __be32 disn) +{ + struct kdf_input_block { + u8 counter; + u8 label[6]; + struct tcp6_ao_context ctx; + __be16 outlen; + } __packed * tmp; + struct tcp_sigpool hp; + int err; + + err = tcp_sigpool_start(mkt->tcp_sigpool_id, &hp); + if (err) + return err; + + tmp = hp.scratch; + tmp->counter = 1; + memcpy(tmp->label, "TCP-AO", 6); + tmp->ctx.saddr = *saddr; + tmp->ctx.daddr = *daddr; + tmp->ctx.sport = sport; + tmp->ctx.dport = dport; + tmp->ctx.sisn = sisn; + tmp->ctx.disn = disn; + tmp->outlen = htons(tcp_ao_digest_size(mkt) * 8); /* in bits */ + + err = tcp_ao_calc_traffic_key(mkt, key, tmp, sizeof(*tmp), &hp); + tcp_sigpool_end(&hp); + + return err; +} + +int tcp_v6_ao_calc_key_skb(struct tcp_ao_key *mkt, u8 *key, + const struct sk_buff *skb, + __be32 sisn, __be32 disn) +{ + const struct ipv6hdr *iph = ipv6_hdr(skb); + const struct tcphdr *th = tcp_hdr(skb); + + return tcp_v6_ao_calc_key(mkt, key, &iph->saddr, + &iph->daddr, th->source, + th->dest, sisn, disn); +} + +int tcp_v6_ao_calc_key_sk(struct tcp_ao_key *mkt, u8 *key, + const struct sock *sk, __be32 sisn, + __be32 disn, bool send) +{ + if (send) + return tcp_v6_ao_calc_key(mkt, key, &sk->sk_v6_rcv_saddr, + &sk->sk_v6_daddr, htons(sk->sk_num), + sk->sk_dport, sisn, disn); + else + return tcp_v6_ao_calc_key(mkt, key, &sk->sk_v6_daddr, + &sk->sk_v6_rcv_saddr, sk->sk_dport, + htons(sk->sk_num), disn, sisn); +} + +int tcp_v6_ao_calc_key_rsk(struct tcp_ao_key *mkt, u8 *key, + struct request_sock *req) +{ + struct inet_request_sock *ireq = inet_rsk(req); + + return tcp_v6_ao_calc_key(mkt, key, + &ireq->ir_v6_loc_addr, &ireq->ir_v6_rmt_addr, + htons(ireq->ir_num), ireq->ir_rmt_port, + htonl(tcp_rsk(req)->snt_isn), + htonl(tcp_rsk(req)->rcv_isn)); +} + +struct tcp_ao_key *tcp_v6_ao_lookup(const struct sock *sk, + struct sock *addr_sk, + int sndid, int rcvid) +{ + int l3index = l3mdev_master_ifindex_by_index(sock_net(sk), + addr_sk->sk_bound_dev_if); + struct in6_addr *addr = &addr_sk->sk_v6_daddr; + + return tcp_ao_do_lookup(sk, l3index, (union tcp_ao_addr *)addr, + AF_INET6, sndid, rcvid); +} + +struct tcp_ao_key *tcp_v6_ao_lookup_rsk(const struct sock *sk, + struct request_sock *req, + int sndid, int rcvid) +{ + struct inet_request_sock *ireq = inet_rsk(req); + struct in6_addr *addr = &ireq->ir_v6_rmt_addr; + int l3index; + + l3index = l3mdev_master_ifindex_by_index(sock_net(sk), ireq->ir_iif); + return tcp_ao_do_lookup(sk, l3index, (union tcp_ao_addr *)addr, + AF_INET6, sndid, rcvid); +} + +int tcp_v6_ao_hash_pseudoheader(struct tcp_sigpool *hp, + const struct in6_addr *daddr, + const struct in6_addr *saddr, int nbytes) +{ + struct tcp6_pseudohdr *bp; + struct scatterlist sg; + + bp = hp->scratch; + /* 1. TCP pseudo-header (RFC2460) */ + bp->saddr = *saddr; + bp->daddr = *daddr; + bp->len = cpu_to_be32(nbytes); + bp->protocol = cpu_to_be32(IPPROTO_TCP); + + sg_init_one(&sg, bp, sizeof(*bp)); + ahash_request_set_crypt(hp->req, &sg, NULL, sizeof(*bp)); + return crypto_ahash_update(hp->req); +} + +int tcp_v6_ao_hash_skb(char *ao_hash, struct tcp_ao_key *key, + const struct sock *sk, const struct sk_buff *skb, + const u8 *tkey, int hash_offset, u32 sne) +{ + return tcp_ao_hash_skb(AF_INET6, ao_hash, key, sk, skb, tkey, + hash_offset, sne); +} + +int tcp_v6_parse_ao(struct sock *sk, int cmd, + sockptr_t optval, int optlen) +{ + return tcp_parse_ao(sk, cmd, AF_INET6, optval, optlen); +} + +int tcp_v6_ao_synack_hash(char *ao_hash, struct tcp_ao_key *ao_key, + struct request_sock *req, const struct sk_buff *skb, + int hash_offset, u32 sne) +{ + void *hash_buf = NULL; + int err; + + hash_buf = kmalloc(tcp_ao_digest_size(ao_key), GFP_ATOMIC); + if (!hash_buf) + return -ENOMEM; + + err = tcp_v6_ao_calc_key_rsk(ao_key, hash_buf, req); + if (err) + goto out; + + err = tcp_ao_hash_skb(AF_INET6, ao_hash, ao_key, req_to_sk(req), skb, + hash_buf, hash_offset, sne); +out: + kfree(hash_buf); + return err; +} |