From 60c04aecd8a72a84869308bdf2289a7aabb9a88c Mon Sep 17 00:00:00 2001 From: Joe Perches Date: Mon, 1 Dec 2014 20:29:06 -0800 Subject: [PATCH] udp: Neaten and reduce size of compute_score functions The compute_score functions are a bit difficult to read. Neaten them a bit to reduce object sizes and make them a bit more intelligible. Return early to avoid indentation and avoid unnecessary initializations. (allyesconfig, but w/ -O2 and no profiling) $ size net/ipv[46]/udp.o.* text data bss dec hex filename 28680 1184 25 29889 74c1 net/ipv4/udp.o.new 28756 1184 25 29965 750d net/ipv4/udp.o.old 17600 1010 2 18612 48b4 net/ipv6/udp.o.new 17632 1010 2 18644 48d4 net/ipv6/udp.o.old Signed-off-by: Joe Perches Acked-by: Eric Dumazet Signed-off-by: David S. Miller --- net/ipv4/udp.c | 111 +++++++++++++++++++++++++++--------------------- net/ipv6/udp.c | 113 +++++++++++++++++++++++++++---------------------- 2 files changed, 125 insertions(+), 99 deletions(-) diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index b2d606833ce4..dd8e00634563 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -336,38 +336,45 @@ int udp_v4_get_port(struct sock *sk, unsigned short snum) return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); } -static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, - unsigned short hnum, - __be16 sport, __be32 daddr, __be16 dport, int dif) +static inline int compute_score(struct sock *sk, struct net *net, + __be32 saddr, unsigned short hnum, __be16 sport, + __be32 daddr, __be16 dport, int dif) { - int score = -1; + int score; + struct inet_sock *inet; - if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && - !ipv6_only_sock(sk)) { - struct inet_sock *inet = inet_sk(sk); + if (!net_eq(sock_net(sk), net) || + udp_sk(sk)->udp_port_hash != hnum || + ipv6_only_sock(sk)) + return -1; - score = (sk->sk_family == PF_INET ? 2 : 1); - if (inet->inet_rcv_saddr) { - if (inet->inet_rcv_saddr != daddr) - return -1; - score += 4; - } - if (inet->inet_daddr) { - if (inet->inet_daddr != saddr) - return -1; - score += 4; - } - if (inet->inet_dport) { - if (inet->inet_dport != sport) - return -1; - score += 4; - } - if (sk->sk_bound_dev_if) { - if (sk->sk_bound_dev_if != dif) - return -1; - score += 4; - } + score = (sk->sk_family == PF_INET) ? 2 : 1; + inet = inet_sk(sk); + + if (inet->inet_rcv_saddr) { + if (inet->inet_rcv_saddr != daddr) + return -1; + score += 4; + } + + if (inet->inet_daddr) { + if (inet->inet_daddr != saddr) + return -1; + score += 4; } + + if (inet->inet_dport) { + if (inet->inet_dport != sport) + return -1; + score += 4; + } + + if (sk->sk_bound_dev_if) { + if (sk->sk_bound_dev_if != dif) + return -1; + score += 4; + } + return score; } @@ -378,33 +385,39 @@ static inline int compute_score2(struct sock *sk, struct net *net, __be32 saddr, __be16 sport, __be32 daddr, unsigned int hnum, int dif) { - int score = -1; + int score; + struct inet_sock *inet; + + if (!net_eq(sock_net(sk), net) || + ipv6_only_sock(sk)) + return -1; - if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) { - struct inet_sock *inet = inet_sk(sk); + inet = inet_sk(sk); - if (inet->inet_rcv_saddr != daddr) + if (inet->inet_rcv_saddr != daddr || + inet->inet_num != hnum) + return -1; + + score = (sk->sk_family == PF_INET) ? 2 : 1; + + if (inet->inet_daddr) { + if (inet->inet_daddr != saddr) return -1; - if (inet->inet_num != hnum) + score += 4; + } + + if (inet->inet_dport) { + if (inet->inet_dport != sport) return -1; + score += 4; + } - score = (sk->sk_family == PF_INET ? 2 : 1); - if (inet->inet_daddr) { - if (inet->inet_daddr != saddr) - return -1; - score += 4; - } - if (inet->inet_dport) { - if (inet->inet_dport != sport) - return -1; - score += 4; - } - if (sk->sk_bound_dev_if) { - if (sk->sk_bound_dev_if != dif) - return -1; - score += 4; - } + if (sk->sk_bound_dev_if) { + if (sk->sk_bound_dev_if != dif) + return -1; + score += 4; } + return score; } diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 7cfb5d745a2d..7f96432292ce 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -148,72 +148,85 @@ static inline int compute_score(struct sock *sk, struct net *net, const struct in6_addr *daddr, __be16 dport, int dif) { - int score = -1; + int score; + struct inet_sock *inet; - if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && - sk->sk_family == PF_INET6) { - struct inet_sock *inet = inet_sk(sk); + if (!net_eq(sock_net(sk), net) || + udp_sk(sk)->udp_port_hash != hnum || + sk->sk_family != PF_INET6) + return -1; - score = 0; - if (inet->inet_dport) { - if (inet->inet_dport != sport) - return -1; - score++; - } - if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { - if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) - return -1; - score++; - } - if (!ipv6_addr_any(&sk->sk_v6_daddr)) { - if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) - return -1; - score++; - } - if (sk->sk_bound_dev_if) { - if (sk->sk_bound_dev_if != dif) - return -1; - score++; - } + score = 0; + inet = inet_sk(sk); + + if (inet->inet_dport) { + if (inet->inet_dport != sport) + return -1; + score++; } + + if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { + if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) + return -1; + score++; + } + + if (!ipv6_addr_any(&sk->sk_v6_daddr)) { + if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) + return -1; + score++; + } + + if (sk->sk_bound_dev_if) { + if (sk->sk_bound_dev_if != dif) + return -1; + score++; + } + return score; } #define SCORE2_MAX (1 + 1 + 1) static inline int compute_score2(struct sock *sk, struct net *net, - const struct in6_addr *saddr, __be16 sport, - const struct in6_addr *daddr, unsigned short hnum, - int dif) + const struct in6_addr *saddr, __be16 sport, + const struct in6_addr *daddr, + unsigned short hnum, int dif) { - int score = -1; + int score; + struct inet_sock *inet; - if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && - sk->sk_family == PF_INET6) { - struct inet_sock *inet = inet_sk(sk); + if (!net_eq(sock_net(sk), net) || + udp_sk(sk)->udp_port_hash != hnum || + sk->sk_family != PF_INET6) + return -1; - if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) + if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) + return -1; + + score = 0; + inet = inet_sk(sk); + + if (inet->inet_dport) { + if (inet->inet_dport != sport) return -1; - score = 0; - if (inet->inet_dport) { - if (inet->inet_dport != sport) - return -1; - score++; - } - if (!ipv6_addr_any(&sk->sk_v6_daddr)) { - if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) - return -1; - score++; - } - if (sk->sk_bound_dev_if) { - if (sk->sk_bound_dev_if != dif) - return -1; - score++; - } + score++; } + + if (!ipv6_addr_any(&sk->sk_v6_daddr)) { + if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) + return -1; + score++; + } + + if (sk->sk_bound_dev_if) { + if (sk->sk_bound_dev_if != dif) + return -1; + score++; + } + return score; } - /* called with read_rcu_lock() */ static struct sock *udp6_lib_lookup2(struct net *net, const struct in6_addr *saddr, __be16 sport, -- 2.20.1