From b1190570b451fb9fd77be8c115fcdb418c5108a5 Mon Sep 17 00:00:00 2001 From: Hannes Frederic Sowa Date: Wed, 23 Oct 2013 11:06:56 +0200 Subject: ipv6: split inet6_hash_frag for netfilter and initialize secrets with net_get_random_once Defer the fragmentation hash secret initialization for IPv6 like the previous patch did for IPv4. Because the netfilter logic reuses the hash secret we have to split it first. Thus introduce a new nf_hash_frag function which takes care to seed the hash secret. Cc: David S. Miller Cc: Eric Dumazet Cc: Pablo Neira Ayuso Signed-off-by: Hannes Frederic Sowa Signed-off-by: David S. Miller --- net/ipv6/netfilter/nf_conntrack_reasm.c | 16 ++++++++++++++-- net/ipv6/reassembly.c | 12 ++++++------ 2 files changed, 20 insertions(+), 8 deletions(-) (limited to 'net/ipv6') diff --git a/net/ipv6/netfilter/nf_conntrack_reasm.c b/net/ipv6/netfilter/nf_conntrack_reasm.c index dffdc1a389c..4a258263d8e 100644 --- a/net/ipv6/netfilter/nf_conntrack_reasm.c +++ b/net/ipv6/netfilter/nf_conntrack_reasm.c @@ -144,12 +144,24 @@ static inline u8 ip6_frag_ecn(const struct ipv6hdr *ipv6h) return 1 << (ipv6_get_dsfield(ipv6h) & INET_ECN_MASK); } +static unsigned int nf_hash_frag(__be32 id, const struct in6_addr *saddr, + const struct in6_addr *daddr) +{ + u32 c; + + net_get_random_once(&nf_frags.rnd, sizeof(nf_frags.rnd)); + c = jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr), + (__force u32)id, nf_frags.rnd); + return c & (INETFRAGS_HASHSZ - 1); +} + + static unsigned int nf_hashfn(struct inet_frag_queue *q) { const struct frag_queue *nq; nq = container_of(q, struct frag_queue, q); - return inet6_hash_frag(nq->id, &nq->saddr, &nq->daddr, nf_frags.rnd); + return nf_hash_frag(nq->id, &nq->saddr, &nq->daddr); } static void nf_skb_free(struct sk_buff *skb) @@ -185,7 +197,7 @@ static inline struct frag_queue *fq_find(struct net *net, __be32 id, arg.ecn = ecn; read_lock_bh(&nf_frags.lock); - hash = inet6_hash_frag(id, src, dst, nf_frags.rnd); + hash = nf_hash_frag(id, src, dst); q = inet_frag_find(&net->nf_frag.frags, &nf_frags, &arg, hash); local_bh_enable(); diff --git a/net/ipv6/reassembly.c b/net/ipv6/reassembly.c index 1aeb473b2cc..cc85a9ba501 100644 --- a/net/ipv6/reassembly.c +++ b/net/ipv6/reassembly.c @@ -82,24 +82,24 @@ static int ip6_frag_reasm(struct frag_queue *fq, struct sk_buff *prev, * callers should be careful not to use the hash value outside the ipfrag_lock * as doing so could race with ipfrag_hash_rnd being recalculated. */ -unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, - const struct in6_addr *daddr, u32 rnd) +static unsigned int inet6_hash_frag(__be32 id, const struct in6_addr *saddr, + const struct in6_addr *daddr) { u32 c; + net_get_random_once(&ip6_frags.rnd, sizeof(ip6_frags.rnd)); c = jhash_3words(ipv6_addr_hash(saddr), ipv6_addr_hash(daddr), - (__force u32)id, rnd); + (__force u32)id, ip6_frags.rnd); return c & (INETFRAGS_HASHSZ - 1); } -EXPORT_SYMBOL_GPL(inet6_hash_frag); static unsigned int ip6_hashfn(struct inet_frag_queue *q) { struct frag_queue *fq; fq = container_of(q, struct frag_queue, q); - return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr, ip6_frags.rnd); + return inet6_hash_frag(fq->id, &fq->saddr, &fq->daddr); } bool ip6_frag_match(struct inet_frag_queue *q, void *a) @@ -193,7 +193,7 @@ fq_find(struct net *net, __be32 id, const struct in6_addr *src, arg.ecn = ecn; read_lock(&ip6_frags.lock); - hash = inet6_hash_frag(id, src, dst, ip6_frags.rnd); + hash = inet6_hash_frag(id, src, dst); q = inet_frag_find(&net->ipv6.frags, &ip6_frags, &arg, hash); if (IS_ERR_OR_NULL(q)) { -- cgit v1.2.3-18-g5258