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tcp: extend TCP flags to allow AE bit/ACE field

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With AccECN, there's one additional TCP flag to be used (AE)
and ACE field that overloads the definition of AE, CWR, and
ECE flags. As tcp_flags was previously only 1 byte, the
byte-order stuff needs to be added to it's handling.

Signed-off-by: Ilpo Järvinen <ij@kernel.org>
Signed-off-by: Chia-Yu Chang <chia-yu.chang@nokia-bell-labs.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ilpo Järvinen 2025-03-05 23:38:44 +01:00 committed by David S. Miller
parent 0114a91da6
commit 2c2f08d31d
6 changed files with 25 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/net/tcp.h
View File

@ -943,7 +943,14 @@ static inline u32 tcp_rsk_tsval(const struct tcp_request_sock *treq)
#define TCPHDR_URG BIT(5)
#define TCPHDR_ECE BIT(6)
#define TCPHDR_CWR BIT(7)
#define TCPHDR_AE BIT(8)
#define TCPHDR_FLAGS_MASK (TCPHDR_FIN | TCPHDR_SYN | TCPHDR_RST | \
TCPHDR_PSH | TCPHDR_ACK | TCPHDR_URG | \
TCPHDR_ECE | TCPHDR_CWR | TCPHDR_AE)
#define tcp_flags_ntohs(th) (ntohs(*(__be16 *)&tcp_flag_word(th)) & \
TCPHDR_FLAGS_MASK)
#define TCPHDR_ACE (TCPHDR_ECE | TCPHDR_CWR | TCPHDR_AE)
#define TCPHDR_SYN_ECN (TCPHDR_SYN | TCPHDR_ECE | TCPHDR_CWR)
/* State flags for sacked in struct tcp_skb_cb */
@ -978,7 +985,7 @@ struct tcp_skb_cb {
u16 tcp_gso_size;
};
};
__u8 tcp_flags; /* TCP header flags. (tcp[13]) */
__u16 tcp_flags; /* TCP header flags (tcp[12-13])*/
__u8 sacked; /* State flags for SACK. */
__u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */

9
include/uapi/linux/tcp.h
View File

@ -28,7 +28,8 @@ struct tcphdr {
__be32 seq;
__be32 ack_seq;
#if defined(__LITTLE_ENDIAN_BITFIELD)
__u16 res1:4,
__u16 ae:1,
res1:3,
doff:4,
fin:1,
syn:1,
@ -40,7 +41,8 @@ struct tcphdr {
cwr:1;
#elif defined(__BIG_ENDIAN_BITFIELD)
__u16 doff:4,
res1:4,
res1:3,
ae:1,
cwr:1,
ece:1,
urg:1,
@ -70,6 +72,7 @@ union tcp_word_hdr {
#define tcp_flag_word(tp) (((union tcp_word_hdr *)(tp))->words[3])
enum {
TCP_FLAG_AE = __constant_cpu_to_be32(0x01000000),
TCP_FLAG_CWR = __constant_cpu_to_be32(0x00800000),
TCP_FLAG_ECE = __constant_cpu_to_be32(0x00400000),
TCP_FLAG_URG = __constant_cpu_to_be32(0x00200000),
@ -78,7 +81,7 @@ enum {
TCP_FLAG_RST = __constant_cpu_to_be32(0x00040000),
TCP_FLAG_SYN = __constant_cpu_to_be32(0x00020000),
TCP_FLAG_FIN = __constant_cpu_to_be32(0x00010000),
TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0F000000),
TCP_RESERVED_BITS = __constant_cpu_to_be32(0x0E000000),
TCP_DATA_OFFSET = __constant_cpu_to_be32(0xF0000000)
};

2
net/ipv4/tcp_ipv4.c
View File

@ -2159,7 +2159,7 @@ static void tcp_v4_fill_cb(struct sk_buff *skb, const struct iphdr *iph,
TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
skb->len - th->doff * 4);
TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
TCP_SKB_CB(skb)->tcp_flags = tcp_flags_ntohs(th);
TCP_SKB_CB(skb)->ip_dsfield = ipv4_get_dsfield(iph);
TCP_SKB_CB(skb)->sacked = 0;
TCP_SKB_CB(skb)->has_rxtstamp =

8
net/ipv4/tcp_output.c
View File

@ -403,7 +403,7 @@ static void tcp_ecn_send(struct sock *sk, struct sk_buff *skb,
/* Constructs common control bits of non-data skb. If SYN/FIN is present,
* auto increment end seqno.
*/
static void tcp_init_nondata_skb(struct sk_buff *skb, u32 seq, u8 flags)
static void tcp_init_nondata_skb(struct sk_buff *skb, u32 seq, u16 flags)
{
skb->ip_summed = CHECKSUM_PARTIAL;
@ -1395,7 +1395,7 @@ static int __tcp_transmit_skb(struct sock *sk, struct sk_buff *skb,
th->seq = htonl(tcb->seq);
th->ack_seq = htonl(rcv_nxt);
*(((__be16 *)th) + 6) = htons(((tcp_header_size >> 2) << 12) |
tcb->tcp_flags);
(tcb->tcp_flags & TCPHDR_FLAGS_MASK));
th->check = 0;
th->urg_ptr = 0;
@ -1616,8 +1616,8 @@ int tcp_fragment(struct sock *sk, enum tcp_queue tcp_queue,
struct sk_buff *buff;
int old_factor;
long limit;
u16 flags;
int nlen;
u8 flags;
if (WARN_ON(len > skb->len))
return -EINVAL;
@ -2171,7 +2171,7 @@ static int tso_fragment(struct sock *sk, struct sk_buff *skb, unsigned int len,
{
int nlen = skb->len - len;
struct sk_buff *buff;
u8 flags;
u16 flags;
/* All of a TSO frame must be composed of paged data. */
DEBUG_NET_WARN_ON_ONCE(skb->len != skb->data_len);

2
net/ipv6/tcp_ipv6.c
View File

@ -1731,7 +1731,7 @@ static void tcp_v6_fill_cb(struct sk_buff *skb, const struct ipv6hdr *hdr,
TCP_SKB_CB(skb)->end_seq = (TCP_SKB_CB(skb)->seq + th->syn + th->fin +
skb->len - th->doff*4);
TCP_SKB_CB(skb)->ack_seq = ntohl(th->ack_seq);
TCP_SKB_CB(skb)->tcp_flags = tcp_flag_byte(th);
TCP_SKB_CB(skb)->tcp_flags = tcp_flags_ntohs(th);
TCP_SKB_CB(skb)->ip_dsfield = ipv6_get_dsfield(hdr);
TCP_SKB_CB(skb)->sacked = 0;
TCP_SKB_CB(skb)->has_rxtstamp =

8
net/netfilter/nf_log_syslog.c
View File

@ -216,7 +216,9 @@ nf_log_dump_tcp_header(struct nf_log_buf *m,
/* Max length: 9 "RES=0x3C " */
nf_log_buf_add(m, "RES=0x%02x ", (u_int8_t)(ntohl(tcp_flag_word(th) &
TCP_RESERVED_BITS) >> 22));
/* Max length: 32 "CWR ECE URG ACK PSH RST SYN FIN " */
/* Max length: 35 "AE CWR ECE URG ACK PSH RST SYN FIN " */
if (th->ae)
nf_log_buf_add(m, "AE ");
if (th->cwr)
nf_log_buf_add(m, "CWR ");
if (th->ece)
@ -516,7 +518,7 @@ dump_ipv4_packet(struct net *net, struct nf_log_buf *m,
/* Proto Max log string length */
/* IP: 40+46+6+11+127 = 230 */
/* TCP: 10+max(25,20+30+13+9+32+11+127) = 252 */
/* TCP: 10+max(25,20+30+13+9+35+11+127) = 255 */
/* UDP: 10+max(25,20) = 35 */
/* UDPLITE: 14+max(25,20) = 39 */
/* ICMP: 11+max(25, 18+25+max(19,14,24+3+n+10,3+n+10)) = 91+n */
@ -526,7 +528,7 @@ dump_ipv4_packet(struct net *net, struct nf_log_buf *m,
/* (ICMP allows recursion one level deep) */
/* maxlen = IP + ICMP + IP + max(TCP,UDP,ICMP,unknown) */
/* maxlen = 230+ 91 + 230 + 252 = 803 */
/* maxlen = 230+ 91 + 230 + 255 = 806 */
}
static noinline_for_stack void