![John Fastabend](/assets/img/avatar_default.png)
This completes the cls_rsvp conversion to RCU safe copy, update semantics. As a result all cases of tcf_exts_change occur on empty lists now. Signed-off-by: John Fastabend <john.r.fastabend@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
731 lines
17 KiB
C
731 lines
17 KiB
C
/*
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* net/sched/cls_rsvp.h Template file for RSVPv[46] classifiers.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*/
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/*
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Comparing to general packet classification problem,
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RSVP needs only sevaral relatively simple rules:
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* (dst, protocol) are always specified,
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so that we are able to hash them.
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* src may be exact, or may be wildcard, so that
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we can keep a hash table plus one wildcard entry.
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* source port (or flow label) is important only if src is given.
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IMPLEMENTATION.
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We use a two level hash table: The top level is keyed by
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destination address and protocol ID, every bucket contains a list
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of "rsvp sessions", identified by destination address, protocol and
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DPI(="Destination Port ID"): triple (key, mask, offset).
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Every bucket has a smaller hash table keyed by source address
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(cf. RSVP flowspec) and one wildcard entry for wildcard reservations.
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Every bucket is again a list of "RSVP flows", selected by
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source address and SPI(="Source Port ID" here rather than
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"security parameter index"): triple (key, mask, offset).
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NOTE 1. All the packets with IPv6 extension headers (but AH and ESP)
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and all fragmented packets go to the best-effort traffic class.
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NOTE 2. Two "port id"'s seems to be redundant, rfc2207 requires
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only one "Generalized Port Identifier". So that for classic
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ah, esp (and udp,tcp) both *pi should coincide or one of them
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should be wildcard.
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At first sight, this redundancy is just a waste of CPU
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resources. But DPI and SPI add the possibility to assign different
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priorities to GPIs. Look also at note 4 about tunnels below.
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NOTE 3. One complication is the case of tunneled packets.
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We implement it as following: if the first lookup
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matches a special session with "tunnelhdr" value not zero,
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flowid doesn't contain the true flow ID, but the tunnel ID (1...255).
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In this case, we pull tunnelhdr bytes and restart lookup
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with tunnel ID added to the list of keys. Simple and stupid 8)8)
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It's enough for PIMREG and IPIP.
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NOTE 4. Two GPIs make it possible to parse even GRE packets.
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F.e. DPI can select ETH_P_IP (and necessary flags to make
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tunnelhdr correct) in GRE protocol field and SPI matches
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GRE key. Is it not nice? 8)8)
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Well, as result, despite its simplicity, we get a pretty
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powerful classification engine. */
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struct rsvp_head {
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u32 tmap[256/32];
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u32 hgenerator;
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u8 tgenerator;
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struct rsvp_session __rcu *ht[256];
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struct rcu_head rcu;
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};
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struct rsvp_session {
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struct rsvp_session __rcu *next;
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__be32 dst[RSVP_DST_LEN];
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struct tc_rsvp_gpi dpi;
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u8 protocol;
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u8 tunnelid;
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/* 16 (src,sport) hash slots, and one wildcard source slot */
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struct rsvp_filter __rcu *ht[16 + 1];
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struct rcu_head rcu;
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};
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struct rsvp_filter {
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struct rsvp_filter __rcu *next;
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__be32 src[RSVP_DST_LEN];
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struct tc_rsvp_gpi spi;
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u8 tunnelhdr;
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struct tcf_result res;
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struct tcf_exts exts;
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u32 handle;
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struct rsvp_session *sess;
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struct rcu_head rcu;
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};
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static inline unsigned int hash_dst(__be32 *dst, u8 protocol, u8 tunnelid)
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{
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unsigned int h = (__force __u32)dst[RSVP_DST_LEN - 1];
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h ^= h>>16;
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h ^= h>>8;
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return (h ^ protocol ^ tunnelid) & 0xFF;
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}
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static inline unsigned int hash_src(__be32 *src)
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{
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unsigned int h = (__force __u32)src[RSVP_DST_LEN-1];
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h ^= h>>16;
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h ^= h>>8;
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h ^= h>>4;
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return h & 0xF;
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}
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#define RSVP_APPLY_RESULT() \
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{ \
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int r = tcf_exts_exec(skb, &f->exts, res); \
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if (r < 0) \
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continue; \
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else if (r > 0) \
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return r; \
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}
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static int rsvp_classify(struct sk_buff *skb, const struct tcf_proto *tp,
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struct tcf_result *res)
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{
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struct rsvp_head *head = rcu_dereference_bh(tp->root);
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struct rsvp_session *s;
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struct rsvp_filter *f;
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unsigned int h1, h2;
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__be32 *dst, *src;
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u8 protocol;
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u8 tunnelid = 0;
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u8 *xprt;
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#if RSVP_DST_LEN == 4
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struct ipv6hdr *nhptr;
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if (!pskb_network_may_pull(skb, sizeof(*nhptr)))
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return -1;
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nhptr = ipv6_hdr(skb);
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#else
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struct iphdr *nhptr;
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if (!pskb_network_may_pull(skb, sizeof(*nhptr)))
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return -1;
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nhptr = ip_hdr(skb);
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#endif
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restart:
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#if RSVP_DST_LEN == 4
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src = &nhptr->saddr.s6_addr32[0];
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dst = &nhptr->daddr.s6_addr32[0];
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protocol = nhptr->nexthdr;
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xprt = ((u8 *)nhptr) + sizeof(struct ipv6hdr);
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#else
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src = &nhptr->saddr;
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dst = &nhptr->daddr;
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protocol = nhptr->protocol;
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xprt = ((u8 *)nhptr) + (nhptr->ihl<<2);
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if (ip_is_fragment(nhptr))
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return -1;
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#endif
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h1 = hash_dst(dst, protocol, tunnelid);
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h2 = hash_src(src);
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for (s = rcu_dereference_bh(head->ht[h1]); s;
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s = rcu_dereference_bh(s->next)) {
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if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN - 1] &&
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protocol == s->protocol &&
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!(s->dpi.mask &
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(*(u32 *)(xprt + s->dpi.offset) ^ s->dpi.key)) &&
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#if RSVP_DST_LEN == 4
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dst[0] == s->dst[0] &&
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dst[1] == s->dst[1] &&
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dst[2] == s->dst[2] &&
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#endif
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tunnelid == s->tunnelid) {
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for (f = rcu_dereference_bh(s->ht[h2]); f;
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f = rcu_dereference_bh(f->next)) {
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if (src[RSVP_DST_LEN-1] == f->src[RSVP_DST_LEN - 1] &&
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!(f->spi.mask & (*(u32 *)(xprt + f->spi.offset) ^ f->spi.key))
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#if RSVP_DST_LEN == 4
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&&
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src[0] == f->src[0] &&
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src[1] == f->src[1] &&
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src[2] == f->src[2]
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#endif
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) {
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*res = f->res;
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RSVP_APPLY_RESULT();
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matched:
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if (f->tunnelhdr == 0)
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return 0;
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tunnelid = f->res.classid;
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nhptr = (void *)(xprt + f->tunnelhdr - sizeof(*nhptr));
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goto restart;
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}
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}
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/* And wildcard bucket... */
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for (f = rcu_dereference_bh(s->ht[16]); f;
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f = rcu_dereference_bh(f->next)) {
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*res = f->res;
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RSVP_APPLY_RESULT();
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goto matched;
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}
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return -1;
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}
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}
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return -1;
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}
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static void rsvp_replace(struct tcf_proto *tp, struct rsvp_filter *n, u32 h)
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{
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struct rsvp_head *head = rtnl_dereference(tp->root);
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struct rsvp_session *s;
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struct rsvp_filter __rcu **ins;
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struct rsvp_filter *pins;
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unsigned int h1 = h & 0xFF;
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unsigned int h2 = (h >> 8) & 0xFF;
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for (s = rtnl_dereference(head->ht[h1]); s;
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s = rtnl_dereference(s->next)) {
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for (ins = &s->ht[h2], pins = rtnl_dereference(*ins); ;
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ins = &pins->next, pins = rtnl_dereference(*ins)) {
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if (pins->handle == h) {
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RCU_INIT_POINTER(n->next, pins->next);
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rcu_assign_pointer(*ins, n);
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return;
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}
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}
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}
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/* Something went wrong if we are trying to replace a non-existant
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* node. Mind as well halt instead of silently failing.
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*/
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BUG_ON(1);
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}
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static unsigned long rsvp_get(struct tcf_proto *tp, u32 handle)
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{
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struct rsvp_head *head = rtnl_dereference(tp->root);
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struct rsvp_session *s;
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struct rsvp_filter *f;
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unsigned int h1 = handle & 0xFF;
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unsigned int h2 = (handle >> 8) & 0xFF;
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if (h2 > 16)
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return 0;
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for (s = rtnl_dereference(head->ht[h1]); s;
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s = rtnl_dereference(s->next)) {
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for (f = rtnl_dereference(s->ht[h2]); f;
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f = rtnl_dereference(f->next)) {
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if (f->handle == handle)
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return (unsigned long)f;
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}
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}
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return 0;
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}
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static void rsvp_put(struct tcf_proto *tp, unsigned long f)
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{
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}
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static int rsvp_init(struct tcf_proto *tp)
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{
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struct rsvp_head *data;
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data = kzalloc(sizeof(struct rsvp_head), GFP_KERNEL);
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if (data) {
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rcu_assign_pointer(tp->root, data);
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return 0;
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}
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return -ENOBUFS;
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}
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static void
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rsvp_delete_filter(struct tcf_proto *tp, struct rsvp_filter *f)
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{
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tcf_unbind_filter(tp, &f->res);
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tcf_exts_destroy(&f->exts);
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kfree_rcu(f, rcu);
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}
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static void rsvp_destroy(struct tcf_proto *tp)
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{
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struct rsvp_head *data = rtnl_dereference(tp->root);
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int h1, h2;
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if (data == NULL)
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return;
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RCU_INIT_POINTER(tp->root, NULL);
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for (h1 = 0; h1 < 256; h1++) {
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struct rsvp_session *s;
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while ((s = rtnl_dereference(data->ht[h1])) != NULL) {
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RCU_INIT_POINTER(data->ht[h1], s->next);
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for (h2 = 0; h2 <= 16; h2++) {
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struct rsvp_filter *f;
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while ((f = rtnl_dereference(s->ht[h2])) != NULL) {
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rcu_assign_pointer(s->ht[h2], f->next);
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rsvp_delete_filter(tp, f);
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}
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}
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kfree_rcu(s, rcu);
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}
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}
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kfree_rcu(data, rcu);
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}
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static int rsvp_delete(struct tcf_proto *tp, unsigned long arg)
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{
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struct rsvp_head *head = rtnl_dereference(tp->root);
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struct rsvp_filter *nfp, *f = (struct rsvp_filter *)arg;
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struct rsvp_filter __rcu **fp;
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unsigned int h = f->handle;
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struct rsvp_session __rcu **sp;
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struct rsvp_session *nsp, *s = f->sess;
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int i;
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fp = &s->ht[(h >> 8) & 0xFF];
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for (nfp = rtnl_dereference(*fp); nfp;
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fp = &nfp->next, nfp = rtnl_dereference(*fp)) {
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if (nfp == f) {
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RCU_INIT_POINTER(*fp, f->next);
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rsvp_delete_filter(tp, f);
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/* Strip tree */
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for (i = 0; i <= 16; i++)
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if (s->ht[i])
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return 0;
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/* OK, session has no flows */
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sp = &head->ht[h & 0xFF];
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for (nsp = rtnl_dereference(*sp); nsp;
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sp = &nsp->next, nsp = rtnl_dereference(*sp)) {
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if (nsp == s) {
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RCU_INIT_POINTER(*sp, s->next);
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kfree_rcu(s, rcu);
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return 0;
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}
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}
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return 0;
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}
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}
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return 0;
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}
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static unsigned int gen_handle(struct tcf_proto *tp, unsigned salt)
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{
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struct rsvp_head *data = rtnl_dereference(tp->root);
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int i = 0xFFFF;
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while (i-- > 0) {
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u32 h;
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if ((data->hgenerator += 0x10000) == 0)
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data->hgenerator = 0x10000;
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h = data->hgenerator|salt;
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if (rsvp_get(tp, h) == 0)
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return h;
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}
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return 0;
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}
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static int tunnel_bts(struct rsvp_head *data)
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{
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int n = data->tgenerator >> 5;
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u32 b = 1 << (data->tgenerator & 0x1F);
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if (data->tmap[n] & b)
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return 0;
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data->tmap[n] |= b;
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return 1;
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}
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static void tunnel_recycle(struct rsvp_head *data)
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{
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struct rsvp_session __rcu **sht = data->ht;
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u32 tmap[256/32];
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int h1, h2;
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memset(tmap, 0, sizeof(tmap));
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for (h1 = 0; h1 < 256; h1++) {
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struct rsvp_session *s;
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for (s = rtnl_dereference(sht[h1]); s;
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s = rtnl_dereference(s->next)) {
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for (h2 = 0; h2 <= 16; h2++) {
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struct rsvp_filter *f;
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for (f = rtnl_dereference(s->ht[h2]); f;
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f = rtnl_dereference(f->next)) {
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if (f->tunnelhdr == 0)
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continue;
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data->tgenerator = f->res.classid;
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tunnel_bts(data);
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}
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}
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}
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}
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memcpy(data->tmap, tmap, sizeof(tmap));
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}
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static u32 gen_tunnel(struct rsvp_head *data)
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{
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int i, k;
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for (k = 0; k < 2; k++) {
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for (i = 255; i > 0; i--) {
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if (++data->tgenerator == 0)
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data->tgenerator = 1;
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if (tunnel_bts(data))
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return data->tgenerator;
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}
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tunnel_recycle(data);
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}
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return 0;
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}
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static const struct nla_policy rsvp_policy[TCA_RSVP_MAX + 1] = {
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[TCA_RSVP_CLASSID] = { .type = NLA_U32 },
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[TCA_RSVP_DST] = { .type = NLA_BINARY,
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.len = RSVP_DST_LEN * sizeof(u32) },
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[TCA_RSVP_SRC] = { .type = NLA_BINARY,
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.len = RSVP_DST_LEN * sizeof(u32) },
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[TCA_RSVP_PINFO] = { .len = sizeof(struct tc_rsvp_pinfo) },
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};
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static int rsvp_change(struct net *net, struct sk_buff *in_skb,
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struct tcf_proto *tp, unsigned long base,
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u32 handle,
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struct nlattr **tca,
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unsigned long *arg, bool ovr)
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{
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struct rsvp_head *data = rtnl_dereference(tp->root);
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struct rsvp_filter *f, *nfp;
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struct rsvp_filter __rcu **fp;
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struct rsvp_session *nsp, *s;
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struct rsvp_session __rcu **sp;
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struct tc_rsvp_pinfo *pinfo = NULL;
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struct nlattr *opt = tca[TCA_OPTIONS];
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struct nlattr *tb[TCA_RSVP_MAX + 1];
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struct tcf_exts e;
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unsigned int h1, h2;
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__be32 *dst;
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int err;
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if (opt == NULL)
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return handle ? -EINVAL : 0;
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err = nla_parse_nested(tb, TCA_RSVP_MAX, opt, rsvp_policy);
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if (err < 0)
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return err;
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tcf_exts_init(&e, TCA_RSVP_ACT, TCA_RSVP_POLICE);
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err = tcf_exts_validate(net, tp, tb, tca[TCA_RATE], &e, ovr);
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if (err < 0)
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return err;
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f = (struct rsvp_filter *)*arg;
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if (f) {
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/* Node exists: adjust only classid */
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struct rsvp_filter *n;
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if (f->handle != handle && handle)
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goto errout2;
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n = kmemdup(f, sizeof(*f), GFP_KERNEL);
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if (!n) {
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err = -ENOMEM;
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goto errout2;
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}
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tcf_exts_init(&n->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE);
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if (tb[TCA_RSVP_CLASSID]) {
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n->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]);
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tcf_bind_filter(tp, &n->res, base);
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}
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tcf_exts_change(tp, &n->exts, &e);
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rsvp_replace(tp, n, handle);
|
|
return 0;
|
|
}
|
|
|
|
/* Now more serious part... */
|
|
err = -EINVAL;
|
|
if (handle)
|
|
goto errout2;
|
|
if (tb[TCA_RSVP_DST] == NULL)
|
|
goto errout2;
|
|
|
|
err = -ENOBUFS;
|
|
f = kzalloc(sizeof(struct rsvp_filter), GFP_KERNEL);
|
|
if (f == NULL)
|
|
goto errout2;
|
|
|
|
tcf_exts_init(&f->exts, TCA_RSVP_ACT, TCA_RSVP_POLICE);
|
|
h2 = 16;
|
|
if (tb[TCA_RSVP_SRC]) {
|
|
memcpy(f->src, nla_data(tb[TCA_RSVP_SRC]), sizeof(f->src));
|
|
h2 = hash_src(f->src);
|
|
}
|
|
if (tb[TCA_RSVP_PINFO]) {
|
|
pinfo = nla_data(tb[TCA_RSVP_PINFO]);
|
|
f->spi = pinfo->spi;
|
|
f->tunnelhdr = pinfo->tunnelhdr;
|
|
}
|
|
if (tb[TCA_RSVP_CLASSID])
|
|
f->res.classid = nla_get_u32(tb[TCA_RSVP_CLASSID]);
|
|
|
|
dst = nla_data(tb[TCA_RSVP_DST]);
|
|
h1 = hash_dst(dst, pinfo ? pinfo->protocol : 0, pinfo ? pinfo->tunnelid : 0);
|
|
|
|
err = -ENOMEM;
|
|
if ((f->handle = gen_handle(tp, h1 | (h2<<8))) == 0)
|
|
goto errout;
|
|
|
|
if (f->tunnelhdr) {
|
|
err = -EINVAL;
|
|
if (f->res.classid > 255)
|
|
goto errout;
|
|
|
|
err = -ENOMEM;
|
|
if (f->res.classid == 0 &&
|
|
(f->res.classid = gen_tunnel(data)) == 0)
|
|
goto errout;
|
|
}
|
|
|
|
for (sp = &data->ht[h1];
|
|
(s = rtnl_dereference(*sp)) != NULL;
|
|
sp = &s->next) {
|
|
if (dst[RSVP_DST_LEN-1] == s->dst[RSVP_DST_LEN-1] &&
|
|
pinfo && pinfo->protocol == s->protocol &&
|
|
memcmp(&pinfo->dpi, &s->dpi, sizeof(s->dpi)) == 0 &&
|
|
#if RSVP_DST_LEN == 4
|
|
dst[0] == s->dst[0] &&
|
|
dst[1] == s->dst[1] &&
|
|
dst[2] == s->dst[2] &&
|
|
#endif
|
|
pinfo->tunnelid == s->tunnelid) {
|
|
|
|
insert:
|
|
/* OK, we found appropriate session */
|
|
|
|
fp = &s->ht[h2];
|
|
|
|
f->sess = s;
|
|
if (f->tunnelhdr == 0)
|
|
tcf_bind_filter(tp, &f->res, base);
|
|
|
|
tcf_exts_change(tp, &f->exts, &e);
|
|
|
|
fp = &s->ht[h2];
|
|
for (nfp = rtnl_dereference(*fp); nfp;
|
|
fp = &nfp->next, nfp = rtnl_dereference(*fp)) {
|
|
__u32 mask = nfp->spi.mask & f->spi.mask;
|
|
|
|
if (mask != f->spi.mask)
|
|
break;
|
|
}
|
|
RCU_INIT_POINTER(f->next, nfp);
|
|
rcu_assign_pointer(*fp, f);
|
|
|
|
*arg = (unsigned long)f;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* No session found. Create new one. */
|
|
|
|
err = -ENOBUFS;
|
|
s = kzalloc(sizeof(struct rsvp_session), GFP_KERNEL);
|
|
if (s == NULL)
|
|
goto errout;
|
|
memcpy(s->dst, dst, sizeof(s->dst));
|
|
|
|
if (pinfo) {
|
|
s->dpi = pinfo->dpi;
|
|
s->protocol = pinfo->protocol;
|
|
s->tunnelid = pinfo->tunnelid;
|
|
}
|
|
sp = &data->ht[h1];
|
|
for (nsp = rtnl_dereference(*sp); nsp;
|
|
sp = &nsp->next, nsp = rtnl_dereference(*sp)) {
|
|
if ((nsp->dpi.mask & s->dpi.mask) != s->dpi.mask)
|
|
break;
|
|
}
|
|
RCU_INIT_POINTER(s->next, nsp);
|
|
rcu_assign_pointer(*sp, s);
|
|
|
|
goto insert;
|
|
|
|
errout:
|
|
kfree(f);
|
|
errout2:
|
|
tcf_exts_destroy(&e);
|
|
return err;
|
|
}
|
|
|
|
static void rsvp_walk(struct tcf_proto *tp, struct tcf_walker *arg)
|
|
{
|
|
struct rsvp_head *head = rtnl_dereference(tp->root);
|
|
unsigned int h, h1;
|
|
|
|
if (arg->stop)
|
|
return;
|
|
|
|
for (h = 0; h < 256; h++) {
|
|
struct rsvp_session *s;
|
|
|
|
for (s = rtnl_dereference(head->ht[h]); s;
|
|
s = rtnl_dereference(s->next)) {
|
|
for (h1 = 0; h1 <= 16; h1++) {
|
|
struct rsvp_filter *f;
|
|
|
|
for (f = rtnl_dereference(s->ht[h1]); f;
|
|
f = rtnl_dereference(f->next)) {
|
|
if (arg->count < arg->skip) {
|
|
arg->count++;
|
|
continue;
|
|
}
|
|
if (arg->fn(tp, (unsigned long)f, arg) < 0) {
|
|
arg->stop = 1;
|
|
return;
|
|
}
|
|
arg->count++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int rsvp_dump(struct net *net, struct tcf_proto *tp, unsigned long fh,
|
|
struct sk_buff *skb, struct tcmsg *t)
|
|
{
|
|
struct rsvp_filter *f = (struct rsvp_filter *)fh;
|
|
struct rsvp_session *s;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct nlattr *nest;
|
|
struct tc_rsvp_pinfo pinfo;
|
|
|
|
if (f == NULL)
|
|
return skb->len;
|
|
s = f->sess;
|
|
|
|
t->tcm_handle = f->handle;
|
|
|
|
nest = nla_nest_start(skb, TCA_OPTIONS);
|
|
if (nest == NULL)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put(skb, TCA_RSVP_DST, sizeof(s->dst), &s->dst))
|
|
goto nla_put_failure;
|
|
pinfo.dpi = s->dpi;
|
|
pinfo.spi = f->spi;
|
|
pinfo.protocol = s->protocol;
|
|
pinfo.tunnelid = s->tunnelid;
|
|
pinfo.tunnelhdr = f->tunnelhdr;
|
|
pinfo.pad = 0;
|
|
if (nla_put(skb, TCA_RSVP_PINFO, sizeof(pinfo), &pinfo))
|
|
goto nla_put_failure;
|
|
if (f->res.classid &&
|
|
nla_put_u32(skb, TCA_RSVP_CLASSID, f->res.classid))
|
|
goto nla_put_failure;
|
|
if (((f->handle >> 8) & 0xFF) != 16 &&
|
|
nla_put(skb, TCA_RSVP_SRC, sizeof(f->src), f->src))
|
|
goto nla_put_failure;
|
|
|
|
if (tcf_exts_dump(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
|
|
nla_nest_end(skb, nest);
|
|
|
|
if (tcf_exts_dump_stats(skb, &f->exts) < 0)
|
|
goto nla_put_failure;
|
|
return skb->len;
|
|
|
|
nla_put_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static struct tcf_proto_ops RSVP_OPS __read_mostly = {
|
|
.kind = RSVP_ID,
|
|
.classify = rsvp_classify,
|
|
.init = rsvp_init,
|
|
.destroy = rsvp_destroy,
|
|
.get = rsvp_get,
|
|
.put = rsvp_put,
|
|
.change = rsvp_change,
|
|
.delete = rsvp_delete,
|
|
.walk = rsvp_walk,
|
|
.dump = rsvp_dump,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int __init init_rsvp(void)
|
|
{
|
|
return register_tcf_proto_ops(&RSVP_OPS);
|
|
}
|
|
|
|
static void __exit exit_rsvp(void)
|
|
{
|
|
unregister_tcf_proto_ops(&RSVP_OPS);
|
|
}
|
|
|
|
module_init(init_rsvp)
|
|
module_exit(exit_rsvp)
|