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Diffstat (limited to 'net/ipv4/tcp_output.c')
-rw-r--r--net/ipv4/tcp_output.c25
1 files changed, 21 insertions, 4 deletions
diff --git a/net/ipv4/tcp_output.c b/net/ipv4/tcp_output.c
index 15a7c7bc3e58..4849be76ccd6 100644
--- a/net/ipv4/tcp_output.c
+++ b/net/ipv4/tcp_output.c
@@ -385,15 +385,17 @@ static inline bool tcp_urg_mode(const struct tcp_sock *tp)
#define OPTION_MD5 (1 << 2)
#define OPTION_WSCALE (1 << 3)
#define OPTION_COOKIE_EXTENSION (1 << 4)
+#define OPTION_FAST_OPEN_COOKIE (1 << 8)
struct tcp_out_options {
- u8 options; /* bit field of OPTION_* */
+ u16 options; /* bit field of OPTION_* */
+ u16 mss; /* 0 to disable */
u8 ws; /* window scale, 0 to disable */
u8 num_sack_blocks; /* number of SACK blocks to include */
u8 hash_size; /* bytes in hash_location */
- u16 mss; /* 0 to disable */
- __u32 tsval, tsecr; /* need to include OPTION_TS */
__u8 *hash_location; /* temporary pointer, overloaded */
+ __u32 tsval, tsecr; /* need to include OPTION_TS */
+ struct tcp_fastopen_cookie *fastopen_cookie; /* Fast open cookie */
};
/* The sysctl int routines are generic, so check consistency here.
@@ -442,7 +444,7 @@ static u8 tcp_cookie_size_check(u8 desired)
static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
struct tcp_out_options *opts)
{
- u8 options = opts->options; /* mungable copy */
+ u16 options = opts->options; /* mungable copy */
/* Having both authentication and cookies for security is redundant,
* and there's certainly not enough room. Instead, the cookie-less
@@ -564,6 +566,21 @@ static void tcp_options_write(__be32 *ptr, struct tcp_sock *tp,
tp->rx_opt.dsack = 0;
}
+
+ if (unlikely(OPTION_FAST_OPEN_COOKIE & options)) {
+ struct tcp_fastopen_cookie *foc = opts->fastopen_cookie;
+
+ *ptr++ = htonl((TCPOPT_EXP << 24) |
+ ((TCPOLEN_EXP_FASTOPEN_BASE + foc->len) << 16) |
+ TCPOPT_FASTOPEN_MAGIC);
+
+ memcpy(ptr, foc->val, foc->len);
+ if ((foc->len & 3) == 2) {
+ u8 *align = ((u8 *)ptr) + foc->len;
+ align[0] = align[1] = TCPOPT_NOP;
+ }
+ ptr += (foc->len + 3) >> 2;
+ }
}
/* Compute TCP options for SYN packets. This is not the final