From 7753c2f0a857bfa6501e67deee03988dd0bcaae7 Mon Sep 17 00:00:00 2001 From: Dmitry Safonov Date: Mon, 23 Oct 2023 20:22:09 +0100 Subject: net/tcp: Add option for TCP-AO to (not) hash header Provide setsockopt() key flag that makes TCP-AO exclude hashing TCP header for peers that match the key. This is needed for interraction with middleboxes that may change TCP options, see RFC5925 (9.2). Co-developed-by: Francesco Ruggeri Signed-off-by: Francesco Ruggeri Co-developed-by: Salam Noureddine Signed-off-by: Salam Noureddine Signed-off-by: Dmitry Safonov Acked-by: David Ahern Signed-off-by: David S. Miller --- net/ipv4/tcp_ao.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'net/ipv4') diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index 223af5c9eaf3..10cc6be4d537 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -562,7 +562,8 @@ int tcp_ao_hash_hdr(unsigned short int family, char *ao_hash, WARN_ON_ONCE(1); goto clear_hash; } - if (tcp_ao_hash_header(&hp, th, false, + if (tcp_ao_hash_header(&hp, th, + !!(key->keyflags & TCP_AO_KEYF_EXCLUDE_OPT), ao_hash, hash_offset, tcp_ao_maclen(key))) goto clear_hash; ahash_request_set_crypt(hp.req, NULL, hash_buf, 0); @@ -610,7 +611,8 @@ int tcp_ao_hash_skb(unsigned short int family, goto clear_hash; if (tcp_ao_hash_pseudoheader(family, sk, skb, &hp, skb->len)) goto clear_hash; - if (tcp_ao_hash_header(&hp, th, false, + if (tcp_ao_hash_header(&hp, th, + !!(key->keyflags & TCP_AO_KEYF_EXCLUDE_OPT), ao_hash, hash_offset, tcp_ao_maclen(key))) goto clear_hash; if (tcp_sigpool_hash_skb_data(&hp, skb, th->doff << 2)) @@ -1454,7 +1456,7 @@ static struct tcp_ao_info *setsockopt_ao_info(struct sock *sk) return ERR_PTR(-ESOCKTNOSUPPORT); } -#define TCP_AO_KEYF_ALL (0) +#define TCP_AO_KEYF_ALL (TCP_AO_KEYF_EXCLUDE_OPT) static struct tcp_ao_key *tcp_ao_key_alloc(struct sock *sk, struct tcp_ao_add *cmd) -- cgit v1.2.3-58-ga151