diff options
Diffstat (limited to 'tcp.c')
| -rw-r--r-- | tcp.c | 32 |
1 files changed, 10 insertions, 22 deletions
@@ -1165,18 +1165,13 @@ static int tcp_hash_match(const struct tcp_tap_conn *conn, static unsigned int tcp_hash(const struct ctx *c, const union inany_addr *faddr, in_port_t eport, in_port_t fport) { - struct { - union inany_addr faddr; - in_port_t eport; - in_port_t fport; - } __attribute__((__packed__)) in = { - *faddr, eport, fport - }; - uint64_t b = 0; + struct siphash_state state = SIPHASH_INIT(c->tcp.hash_secret); + uint64_t hash; - b = siphash_20b((uint8_t *)&in, c->tcp.hash_secret); + inany_siphash_feed(&state, faddr); + hash = siphash_final(&state, 20, (uint64_t)eport << 16 | fport); - return (unsigned int)(b % TCP_HASH_TABLE_SIZE); + return (unsigned int)(hash % TCP_HASH_TABLE_SIZE); } /** @@ -1815,17 +1810,8 @@ static void tcp_clamp_window(const struct ctx *c, struct tcp_tap_conn *conn, static void tcp_seq_init(const struct ctx *c, struct tcp_tap_conn *conn, const struct timespec *now) { + struct siphash_state state = SIPHASH_INIT(c->tcp.hash_secret); union inany_addr aany; - struct { - union inany_addr src; - in_port_t srcport; - union inany_addr dst; - in_port_t dstport; - } __attribute__((__packed__)) in = { - .src = conn->faddr, - .srcport = conn->fport, - .dstport = conn->eport, - }; uint64_t hash; uint32_t ns; @@ -1833,9 +1819,11 @@ static void tcp_seq_init(const struct ctx *c, struct tcp_tap_conn *conn, inany_from_af(&aany, AF_INET, &c->ip4.addr); else inany_from_af(&aany, AF_INET6, &c->ip6.addr); - in.dst = aany; - hash = siphash_36b((uint8_t *)&in, c->tcp.hash_secret); + inany_siphash_feed(&state, &conn->faddr); + inany_siphash_feed(&state, &aany); + hash = siphash_final(&state, 36, + (uint64_t)conn->fport << 16 | conn->eport); /* 32ns ticks, overflows 32 bits every 137s */ ns = (now->tv_sec * 1000000000 + now->tv_nsec) >> 5; |