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 <fruggeri@xxxxxxxxxx> Signed-off-by: Francesco Ruggeri <fruggeri@xxxxxxxxxx> Co-developed-by: Salam Noureddine <noureddine@xxxxxxxxxx> Signed-off-by: Salam Noureddine <noureddine@xxxxxxxxxx> Signed-off-by: Dmitry Safonov <dima@xxxxxxxxxx> --- include/uapi/linux/tcp.h | 2 ++ net/ipv4/tcp_ao.c | 8 +++++--- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/include/uapi/linux/tcp.h b/include/uapi/linux/tcp.h index 508bedbc6ad8..b60933ee2a27 100644 --- a/include/uapi/linux/tcp.h +++ b/include/uapi/linux/tcp.h @@ -347,6 +347,8 @@ struct tcp_diag_md5sig { #define TCP_AO_MAXKEYLEN 80 +#define TCP_AO_KEYF_EXCLUDE_OPT (1 << 0) + #define TCP_AO_CMDF_CURR (1 << 0) /* Only checks field sndid */ #define TCP_AO_CMDF_NEXT (1 << 1) /* Only checks field rcvid */ #define TCP_AO_CMDF_ACCEPT_ICMP (1 << 2) /* Accept incoming ICMPs */ diff --git a/net/ipv4/tcp_ao.c b/net/ipv4/tcp_ao.c index e5b4e9f1e83e..90b864d4ee7d 100644 --- a/net/ipv4/tcp_ao.c +++ b/net/ipv4/tcp_ao.c @@ -604,7 +604,8 @@ 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, ao_hash, 0); @@ -646,7 +647,8 @@ 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_ao_hash_skb_data(&hp, skb, th->doff << 2)) @@ -1497,7 +1499,7 @@ static inline bool tcp_ao_mkt_overlap_v6(struct tcp_ao *cmd, } #endif -#define TCP_AO_KEYF_ALL (0) +#define TCP_AO_KEYF_ALL (TCP_AO_KEYF_EXCLUDE_OPT) #define TCP_AO_CMDF_ADDMOD_VALID \ (TCP_AO_CMDF_CURR | TCP_AO_CMDF_NEXT | TCP_AO_CMDF_ACCEPT_ICMP) #define TCP_AO_CMDF_DEL_VALID \ -- 2.38.1