mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 21:57:43 +00:00
2d9cc60aee
This patch adds the necessary functions to parse, fill, and compare seg6local rtnetlink attributes, for all defined action parameters. - The SRH parameter defines an SRH to be inserted or encapsulated. - The TABLE parameter defines the table to use for the route lookup of the next segment or the inner decapsulated packet. - The NH4 parameter defines the IPv4 next-hop for an inner decapsulated IPv4 packet. - The NH6 parameter defines the IPv6 next-hop for the next segment or for an inner decapsulated IPv6 packet - The IIF parameter defines an ingress interface index. - The OIF parameter defines an egress interface index. Signed-off-by: David Lebrun <david.lebrun@uclouvain.be> Signed-off-by: David S. Miller <davem@davemloft.net>
495 lines
11 KiB
C
495 lines
11 KiB
C
/*
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* SR-IPv6 implementation
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*
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* Author:
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* David Lebrun <david.lebrun@uclouvain.be>
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*
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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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#include <linux/types.h>
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#include <linux/skbuff.h>
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#include <linux/net.h>
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#include <linux/module.h>
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#include <net/ip.h>
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#include <net/lwtunnel.h>
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#include <net/netevent.h>
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#include <net/netns/generic.h>
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#include <net/ip6_fib.h>
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#include <net/route.h>
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#include <net/seg6.h>
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#include <linux/seg6.h>
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#include <linux/seg6_local.h>
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#include <net/addrconf.h>
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#include <net/ip6_route.h>
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#include <net/dst_cache.h>
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#ifdef CONFIG_IPV6_SEG6_HMAC
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#include <net/seg6_hmac.h>
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#endif
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struct seg6_local_lwt;
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struct seg6_action_desc {
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int action;
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unsigned long attrs;
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int (*input)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
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int static_headroom;
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};
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struct seg6_local_lwt {
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int action;
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struct ipv6_sr_hdr *srh;
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int table;
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struct in_addr nh4;
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struct in6_addr nh6;
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int iif;
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int oif;
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int headroom;
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struct seg6_action_desc *desc;
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};
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static struct seg6_local_lwt *seg6_local_lwtunnel(struct lwtunnel_state *lwt)
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{
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return (struct seg6_local_lwt *)lwt->data;
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}
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static struct seg6_action_desc seg6_action_table[] = {
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{
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.action = SEG6_LOCAL_ACTION_END,
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.attrs = 0,
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},
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};
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static struct seg6_action_desc *__get_action_desc(int action)
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{
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struct seg6_action_desc *desc;
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int i, count;
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count = sizeof(seg6_action_table) / sizeof(struct seg6_action_desc);
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for (i = 0; i < count; i++) {
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desc = &seg6_action_table[i];
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if (desc->action == action)
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return desc;
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}
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return NULL;
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}
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static int seg6_local_input(struct sk_buff *skb)
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{
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struct dst_entry *orig_dst = skb_dst(skb);
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struct seg6_action_desc *desc;
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struct seg6_local_lwt *slwt;
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slwt = seg6_local_lwtunnel(orig_dst->lwtstate);
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desc = slwt->desc;
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return desc->input(skb, slwt);
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}
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static const struct nla_policy seg6_local_policy[SEG6_LOCAL_MAX + 1] = {
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[SEG6_LOCAL_ACTION] = { .type = NLA_U32 },
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[SEG6_LOCAL_SRH] = { .type = NLA_BINARY },
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[SEG6_LOCAL_TABLE] = { .type = NLA_U32 },
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[SEG6_LOCAL_NH4] = { .type = NLA_BINARY,
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.len = sizeof(struct in_addr) },
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[SEG6_LOCAL_NH6] = { .type = NLA_BINARY,
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.len = sizeof(struct in6_addr) },
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[SEG6_LOCAL_IIF] = { .type = NLA_U32 },
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[SEG6_LOCAL_OIF] = { .type = NLA_U32 },
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};
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static int parse_nla_srh(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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int len;
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srh = nla_data(attrs[SEG6_LOCAL_SRH]);
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len = nla_len(attrs[SEG6_LOCAL_SRH]);
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/* SRH must contain at least one segment */
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if (len < sizeof(*srh) + sizeof(struct in6_addr))
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return -EINVAL;
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if (!seg6_validate_srh(srh, len))
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return -EINVAL;
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slwt->srh = kmalloc(len, GFP_KERNEL);
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if (!slwt->srh)
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return -ENOMEM;
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memcpy(slwt->srh, srh, len);
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slwt->headroom += len;
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return 0;
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}
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static int put_nla_srh(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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struct ipv6_sr_hdr *srh;
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struct nlattr *nla;
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int len;
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srh = slwt->srh;
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len = (srh->hdrlen + 1) << 3;
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nla = nla_reserve(skb, SEG6_LOCAL_SRH, len);
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if (!nla)
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return -EMSGSIZE;
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memcpy(nla_data(nla), srh, len);
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return 0;
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}
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static int cmp_nla_srh(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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int len = (a->srh->hdrlen + 1) << 3;
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if (len != ((b->srh->hdrlen + 1) << 3))
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return 1;
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return memcmp(a->srh, b->srh, len);
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}
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static int parse_nla_table(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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slwt->table = nla_get_u32(attrs[SEG6_LOCAL_TABLE]);
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return 0;
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}
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static int put_nla_table(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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if (nla_put_u32(skb, SEG6_LOCAL_TABLE, slwt->table))
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return -EMSGSIZE;
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return 0;
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}
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static int cmp_nla_table(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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if (a->table != b->table)
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return 1;
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return 0;
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}
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static int parse_nla_nh4(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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memcpy(&slwt->nh4, nla_data(attrs[SEG6_LOCAL_NH4]),
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sizeof(struct in_addr));
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return 0;
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}
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static int put_nla_nh4(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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struct nlattr *nla;
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nla = nla_reserve(skb, SEG6_LOCAL_NH4, sizeof(struct in_addr));
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if (!nla)
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return -EMSGSIZE;
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memcpy(nla_data(nla), &slwt->nh4, sizeof(struct in_addr));
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return 0;
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}
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static int cmp_nla_nh4(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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return memcmp(&a->nh4, &b->nh4, sizeof(struct in_addr));
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}
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static int parse_nla_nh6(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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memcpy(&slwt->nh6, nla_data(attrs[SEG6_LOCAL_NH6]),
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sizeof(struct in6_addr));
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return 0;
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}
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static int put_nla_nh6(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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struct nlattr *nla;
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nla = nla_reserve(skb, SEG6_LOCAL_NH6, sizeof(struct in6_addr));
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if (!nla)
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return -EMSGSIZE;
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memcpy(nla_data(nla), &slwt->nh6, sizeof(struct in6_addr));
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return 0;
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}
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static int cmp_nla_nh6(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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return memcmp(&a->nh6, &b->nh6, sizeof(struct in6_addr));
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}
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static int parse_nla_iif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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slwt->iif = nla_get_u32(attrs[SEG6_LOCAL_IIF]);
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return 0;
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}
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static int put_nla_iif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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if (nla_put_u32(skb, SEG6_LOCAL_IIF, slwt->iif))
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return -EMSGSIZE;
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return 0;
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}
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static int cmp_nla_iif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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if (a->iif != b->iif)
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return 1;
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return 0;
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}
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static int parse_nla_oif(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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slwt->oif = nla_get_u32(attrs[SEG6_LOCAL_OIF]);
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return 0;
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}
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static int put_nla_oif(struct sk_buff *skb, struct seg6_local_lwt *slwt)
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{
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if (nla_put_u32(skb, SEG6_LOCAL_OIF, slwt->oif))
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return -EMSGSIZE;
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return 0;
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}
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static int cmp_nla_oif(struct seg6_local_lwt *a, struct seg6_local_lwt *b)
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{
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if (a->oif != b->oif)
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return 1;
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return 0;
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}
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struct seg6_action_param {
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int (*parse)(struct nlattr **attrs, struct seg6_local_lwt *slwt);
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int (*put)(struct sk_buff *skb, struct seg6_local_lwt *slwt);
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int (*cmp)(struct seg6_local_lwt *a, struct seg6_local_lwt *b);
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};
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static struct seg6_action_param seg6_action_params[SEG6_LOCAL_MAX + 1] = {
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[SEG6_LOCAL_SRH] = { .parse = parse_nla_srh,
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.put = put_nla_srh,
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.cmp = cmp_nla_srh },
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[SEG6_LOCAL_TABLE] = { .parse = parse_nla_table,
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.put = put_nla_table,
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.cmp = cmp_nla_table },
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[SEG6_LOCAL_NH4] = { .parse = parse_nla_nh4,
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.put = put_nla_nh4,
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.cmp = cmp_nla_nh4 },
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[SEG6_LOCAL_NH6] = { .parse = parse_nla_nh6,
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.put = put_nla_nh6,
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.cmp = cmp_nla_nh6 },
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[SEG6_LOCAL_IIF] = { .parse = parse_nla_iif,
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.put = put_nla_iif,
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.cmp = cmp_nla_iif },
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[SEG6_LOCAL_OIF] = { .parse = parse_nla_oif,
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.put = put_nla_oif,
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.cmp = cmp_nla_oif },
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};
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static int parse_nla_action(struct nlattr **attrs, struct seg6_local_lwt *slwt)
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{
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struct seg6_action_param *param;
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struct seg6_action_desc *desc;
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int i, err;
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desc = __get_action_desc(slwt->action);
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if (!desc)
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return -EINVAL;
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if (!desc->input)
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return -EOPNOTSUPP;
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slwt->desc = desc;
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slwt->headroom += desc->static_headroom;
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for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
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if (desc->attrs & (1 << i)) {
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if (!attrs[i])
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return -EINVAL;
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param = &seg6_action_params[i];
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err = param->parse(attrs, slwt);
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if (err < 0)
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return err;
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}
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}
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return 0;
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}
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static int seg6_local_build_state(struct nlattr *nla, unsigned int family,
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const void *cfg, struct lwtunnel_state **ts,
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struct netlink_ext_ack *extack)
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{
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struct nlattr *tb[SEG6_LOCAL_MAX + 1];
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struct lwtunnel_state *newts;
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struct seg6_local_lwt *slwt;
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int err;
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err = nla_parse_nested(tb, SEG6_LOCAL_MAX, nla, seg6_local_policy,
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extack);
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if (err < 0)
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return err;
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if (!tb[SEG6_LOCAL_ACTION])
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return -EINVAL;
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newts = lwtunnel_state_alloc(sizeof(*slwt));
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if (!newts)
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return -ENOMEM;
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slwt = seg6_local_lwtunnel(newts);
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slwt->action = nla_get_u32(tb[SEG6_LOCAL_ACTION]);
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err = parse_nla_action(tb, slwt);
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if (err < 0)
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goto out_free;
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newts->type = LWTUNNEL_ENCAP_SEG6_LOCAL;
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newts->flags = LWTUNNEL_STATE_INPUT_REDIRECT;
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newts->headroom = slwt->headroom;
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*ts = newts;
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return 0;
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out_free:
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kfree(slwt->srh);
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kfree(newts);
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return err;
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}
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static void seg6_local_destroy_state(struct lwtunnel_state *lwt)
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{
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struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
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kfree(slwt->srh);
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}
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static int seg6_local_fill_encap(struct sk_buff *skb,
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struct lwtunnel_state *lwt)
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{
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struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
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struct seg6_action_param *param;
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int i, err;
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if (nla_put_u32(skb, SEG6_LOCAL_ACTION, slwt->action))
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return -EMSGSIZE;
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for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
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if (slwt->desc->attrs & (1 << i)) {
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param = &seg6_action_params[i];
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err = param->put(skb, slwt);
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if (err < 0)
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return err;
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}
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}
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return 0;
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}
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static int seg6_local_get_encap_size(struct lwtunnel_state *lwt)
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{
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struct seg6_local_lwt *slwt = seg6_local_lwtunnel(lwt);
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unsigned long attrs;
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int nlsize;
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nlsize = nla_total_size(4); /* action */
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attrs = slwt->desc->attrs;
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if (attrs & (1 << SEG6_LOCAL_SRH))
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nlsize += nla_total_size((slwt->srh->hdrlen + 1) << 3);
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if (attrs & (1 << SEG6_LOCAL_TABLE))
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nlsize += nla_total_size(4);
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if (attrs & (1 << SEG6_LOCAL_NH4))
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nlsize += nla_total_size(4);
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if (attrs & (1 << SEG6_LOCAL_NH6))
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nlsize += nla_total_size(16);
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if (attrs & (1 << SEG6_LOCAL_IIF))
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nlsize += nla_total_size(4);
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if (attrs & (1 << SEG6_LOCAL_OIF))
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nlsize += nla_total_size(4);
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return nlsize;
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}
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static int seg6_local_cmp_encap(struct lwtunnel_state *a,
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struct lwtunnel_state *b)
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{
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struct seg6_local_lwt *slwt_a, *slwt_b;
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struct seg6_action_param *param;
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int i;
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slwt_a = seg6_local_lwtunnel(a);
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slwt_b = seg6_local_lwtunnel(b);
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if (slwt_a->action != slwt_b->action)
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return 1;
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if (slwt_a->desc->attrs != slwt_b->desc->attrs)
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return 1;
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for (i = 0; i < SEG6_LOCAL_MAX + 1; i++) {
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if (slwt_a->desc->attrs & (1 << i)) {
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param = &seg6_action_params[i];
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if (param->cmp(slwt_a, slwt_b))
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return 1;
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}
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}
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return 0;
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}
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static const struct lwtunnel_encap_ops seg6_local_ops = {
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.build_state = seg6_local_build_state,
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.destroy_state = seg6_local_destroy_state,
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.input = seg6_local_input,
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.fill_encap = seg6_local_fill_encap,
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.get_encap_size = seg6_local_get_encap_size,
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.cmp_encap = seg6_local_cmp_encap,
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.owner = THIS_MODULE,
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};
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int __init seg6_local_init(void)
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{
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return lwtunnel_encap_add_ops(&seg6_local_ops,
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LWTUNNEL_ENCAP_SEG6_LOCAL);
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}
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void seg6_local_exit(void)
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{
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lwtunnel_encap_del_ops(&seg6_local_ops, LWTUNNEL_ENCAP_SEG6_LOCAL);
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}
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