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author | Gerrit Renker <gerrit@erg.abdn.ac.uk> | 2006-08-26 20:06:05 -0700 |
---|---|---|
committer | David S. Miller <davem@sunset.davemloft.net> | 2006-09-22 15:18:21 -0700 |
commit | 25030a7f9eeab2dcefff036469e0e2b4f956198f (patch) | |
tree | 923030c42f1c2bf4aa9cd851df13b95bd0fe542b /net/ipv4/udp.c | |
parent | 6a28ec8cd0c6993a4ac0d52f4347f7ed077b5cac (diff) | |
download | kernel_samsung_smdk4412-25030a7f9eeab2dcefff036469e0e2b4f956198f.zip kernel_samsung_smdk4412-25030a7f9eeab2dcefff036469e0e2b4f956198f.tar.gz kernel_samsung_smdk4412-25030a7f9eeab2dcefff036469e0e2b4f956198f.tar.bz2 |
[UDP]: Unify UDPv4 and UDPv6 ->get_port()
This patch creates one common function which is called by
udp_v4_get_port() and udp_v6_get_port(). As a result,
* duplicated code is removed
* udp_port_rover and local port lookup can now be removed from udp.h
* further savings follow since the same function will be used by UDP-Litev4
and UDP-Litev6
In contrast to the patch sent in response to Yoshifujis comments
(fixed by this variant), the code below also removes the
EXPORT_SYMBOL(udp_port_rover), since udp_port_rover can now remain
local to net/ipv4/udp.c.
Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/udp.c')
-rw-r--r-- | net/ipv4/udp.c | 96 |
1 files changed, 60 insertions, 36 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c index 514c1e9..7552b50 100644 --- a/net/ipv4/udp.c +++ b/net/ipv4/udp.c @@ -118,14 +118,34 @@ DEFINE_SNMP_STAT(struct udp_mib, udp_statistics) __read_mostly; struct hlist_head udp_hash[UDP_HTABLE_SIZE]; DEFINE_RWLOCK(udp_hash_lock); -/* Shared by v4/v6 udp. */ +/* Shared by v4/v6 udp_get_port */ int udp_port_rover; -static int udp_v4_get_port(struct sock *sk, unsigned short snum) +static inline int udp_lport_inuse(u16 num) { + struct sock *sk; struct hlist_node *node; + + sk_for_each(sk, node, &udp_hash[num & (UDP_HTABLE_SIZE - 1)]) + if (inet_sk(sk)->num == num) + return 1; + return 0; +} + +/** + * udp_get_port - common port lookup for IPv4 and IPv6 + * + * @sk: socket struct in question + * @snum: port number to look up + * @saddr_comp: AF-dependent comparison of bound local IP addresses + */ +int udp_get_port(struct sock *sk, unsigned short snum, + int (*saddr_cmp)(struct sock *sk1, struct sock *sk2)) +{ + struct hlist_node *node; + struct hlist_head *head; struct sock *sk2; - struct inet_sock *inet = inet_sk(sk); + int error = 1; write_lock_bh(&udp_hash_lock); if (snum == 0) { @@ -137,11 +157,10 @@ static int udp_v4_get_port(struct sock *sk, unsigned short snum) best_size_so_far = 32767; best = result = udp_port_rover; for (i = 0; i < UDP_HTABLE_SIZE; i++, result++) { - struct hlist_head *list; int size; - list = &udp_hash[result & (UDP_HTABLE_SIZE - 1)]; - if (hlist_empty(list)) { + head = &udp_hash[result & (UDP_HTABLE_SIZE - 1)]; + if (hlist_empty(head)) { if (result > sysctl_local_port_range[1]) result = sysctl_local_port_range[0] + ((result - sysctl_local_port_range[0]) & @@ -149,12 +168,11 @@ static int udp_v4_get_port(struct sock *sk, unsigned short snum) goto gotit; } size = 0; - sk_for_each(sk2, node, list) - if (++size >= best_size_so_far) - goto next; - best_size_so_far = size; - best = result; - next:; + sk_for_each(sk2, node, head) + if (++size < best_size_so_far) { + best_size_so_far = size; + best = result; + } } result = best; for(i = 0; i < (1 << 16) / UDP_HTABLE_SIZE; i++, result += UDP_HTABLE_SIZE) { @@ -170,38 +188,44 @@ static int udp_v4_get_port(struct sock *sk, unsigned short snum) gotit: udp_port_rover = snum = result; } else { - sk_for_each(sk2, node, - &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]) { - struct inet_sock *inet2 = inet_sk(sk2); - - if (inet2->num == snum && - sk2 != sk && - !ipv6_only_sock(sk2) && - (!sk2->sk_bound_dev_if || - !sk->sk_bound_dev_if || - sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && - (!inet2->rcv_saddr || - !inet->rcv_saddr || - inet2->rcv_saddr == inet->rcv_saddr) && - (!sk2->sk_reuse || !sk->sk_reuse)) + head = &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]; + + sk_for_each(sk2, node, head) + if (inet_sk(sk2)->num == snum && + sk2 != sk && + (!sk2->sk_reuse || !sk->sk_reuse) && + (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if + || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && + (*saddr_cmp)(sk, sk2) ) goto fail; - } } - inet->num = snum; + inet_sk(sk)->num = snum; if (sk_unhashed(sk)) { - struct hlist_head *h = &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]; - - sk_add_node(sk, h); + head = &udp_hash[snum & (UDP_HTABLE_SIZE - 1)]; + sk_add_node(sk, head); sock_prot_inc_use(sk->sk_prot); } - write_unlock_bh(&udp_hash_lock); - return 0; - + error = 0; fail: write_unlock_bh(&udp_hash_lock); - return 1; + return error; +} + +static inline int ipv4_rcv_saddr_equal(struct sock *sk1, struct sock *sk2) +{ + struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); + + return ( !ipv6_only_sock(sk2) && + (!inet1->rcv_saddr || !inet2->rcv_saddr || + inet1->rcv_saddr == inet2->rcv_saddr )); +} + +static inline int udp_v4_get_port(struct sock *sk, unsigned short snum) +{ + return udp_get_port(sk, snum, ipv4_rcv_saddr_equal); } + static void udp_v4_hash(struct sock *sk) { BUG(); @@ -1596,7 +1620,7 @@ EXPORT_SYMBOL(udp_disconnect); EXPORT_SYMBOL(udp_hash); EXPORT_SYMBOL(udp_hash_lock); EXPORT_SYMBOL(udp_ioctl); -EXPORT_SYMBOL(udp_port_rover); +EXPORT_SYMBOL(udp_get_port); EXPORT_SYMBOL(udp_prot); EXPORT_SYMBOL(udp_sendmsg); EXPORT_SYMBOL(udp_poll); |