/* * DECnet An implementation of the DECnet protocol suite for the LINUX * operating system. DECnet is implemented using the BSD Socket * interface as the means of communication with the user level. * * DECnet Routing Forwarding Information Base (Rules) * * Author: Steve Whitehouse * Mostly copied from Alexey Kuznetsov's ipv4/fib_rules.c * * * Changes: * Steve Whitehouse * Updated for Thomas Graf's generic rules * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static struct fib_rules_ops *dn_fib_rules_ops; struct dn_fib_rule { struct fib_rule common; unsigned char dst_len; unsigned char src_len; __le16 src; __le16 srcmask; __le16 dst; __le16 dstmask; __le16 srcmap; u8 flags; }; int dn_fib_lookup(struct flowidn *flp, struct dn_fib_res *res) { struct fib_lookup_arg arg = { .result = res, }; int err; err = fib_rules_lookup(dn_fib_rules_ops, flowidn_to_flowi(flp), 0, &arg); res->r = arg.rule; return err; } static int dn_fib_rule_action(struct fib_rule *rule, struct flowi *flp, int flags, struct fib_lookup_arg *arg) { struct flowidn *fld = &flp->u.dn; int err = -EAGAIN; struct dn_fib_table *tbl; switch(rule->action) { case FR_ACT_TO_TBL: break; case FR_ACT_UNREACHABLE: err = -ENETUNREACH; goto errout; case FR_ACT_PROHIBIT: err = -EACCES; goto errout; case FR_ACT_BLACKHOLE: default: err = -EINVAL; goto errout; } tbl = dn_fib_get_table(rule->table, 0); if (tbl == NULL) goto errout; err = tbl->lookup(tbl, fld, (struct dn_fib_res *)arg->result); if (err > 0) err = -EAGAIN; errout: return err; } static const struct nla_policy dn_fib_rule_policy[FRA_MAX+1] = { FRA_GENERIC_POLICY, }; static int dn_fib_rule_match(struct fib_rule *rule, struct flowi *fl, int flags) { struct dn_fib_rule *r = (struct dn_fib_rule *)rule; struct flowidn *fld = &fl->u.dn; __le16 daddr = fld->daddr; __le16 saddr = fld->saddr; if (((saddr ^ r->src) & r->srcmask) || ((daddr ^ r->dst) & r->dstmask)) return 0; return 1; } static int dn_fib_rule_configure(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh, struct nlattr **tb) { int err = -EINVAL; struct dn_fib_rule *r = (struct dn_fib_rule *)rule; if (frh->tos) goto errout; if (rule->table == RT_TABLE_UNSPEC) { if (rule->action == FR_ACT_TO_TBL) { struct dn_fib_table *table; table = dn_fib_empty_table(); if (table == NULL) { err = -ENOBUFS; goto errout; } rule->table = table->n; } } if (frh->src_len) r->src = nla_get_le16(tb[FRA_SRC]); if (frh->dst_len) r->dst = nla_get_le16(tb[FRA_DST]); r->src_len = frh->src_len; r->srcmask = dnet_make_mask(r->src_len); r->dst_len = frh->dst_len; r->dstmask = dnet_make_mask(r->dst_len); err = 0; errout: return err; } static int dn_fib_rule_compare(struct fib_rule *rule, struct fib_rule_hdr *frh, struct nlattr **tb) { struct dn_fib_rule *r = (struct dn_fib_rule *)rule; if (frh->src_len && (r->src_len != frh->src_len)) return 0; if (frh->dst_len && (r->dst_len != frh->dst_len)) return 0; if (frh->src_len && (r->src != nla_get_le16(tb[FRA_SRC]))) return 0; if (frh->dst_len && (r->dst != nla_get_le16(tb[FRA_DST]))) return 0; return 1; } unsigned int dnet_addr_type(__le16 addr) { struct flowidn fld = { .daddr = addr }; struct dn_fib_res res; unsigned int ret = RTN_UNICAST; struct dn_fib_table *tb = dn_fib_get_table(RT_TABLE_LOCAL, 0); res.r = NULL; if (tb) { if (!tb->lookup(tb, &fld, &res)) { ret = res.type; dn_fib_res_put(&res); } } return ret; } static int dn_fib_rule_fill(struct fib_rule *rule, struct sk_buff *skb, struct fib_rule_hdr *frh) { struct dn_fib_rule *r = (struct dn_fib_rule *)rule; frh->dst_len = r->dst_len; frh->src_len = r->src_len; frh->tos = 0; if ((r->dst_len && nla_put_le16(skb, FRA_DST, r->dst)) || (r->src_len && nla_put_le16(skb, FRA_SRC, r->src))) goto nla_put_failure; return 0; nla_put_failure: return -ENOBUFS; } static void dn_fib_rule_flush_cache(struct fib_rules_ops *ops) { dn_rt_cache_flush(-1); } static const struct fib_rules_ops __net_initconst dn_fib_rules_ops_template = { .family = AF_DECnet, .rule_size = sizeof(struct dn_fib_rule), .addr_size = sizeof(u16), .action = dn_fib_rule_action, .match = dn_fib_rule_match, .configure = dn_fib_rule_configure, .compare = dn_fib_rule_compare, .fill = dn_fib_rule_fill, .flush_cache = dn_fib_rule_flush_cache, .nlgroup = RTNLGRP_DECnet_RULE, .policy = dn_fib_rule_policy, .owner = THIS_MODULE, .fro_net = &init_net, }; void __init dn_fib_rules_init(void) { dn_fib_rules_ops = fib_rules_register(&dn_fib_rules_ops_template, &init_net); BUG_ON(IS_ERR(dn_fib_rules_ops)); BUG_ON(fib_default_rule_add(dn_fib_rules_ops, 0x7fff, RT_TABLE_MAIN, 0)); } void __exit dn_fib_rules_cleanup(void) { rtnl_lock(); fib_rules_unregister(dn_fib_rules_ops); rtnl_unlock(); rcu_barrier(); } '2' class='oid'>d53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/dccp/qpolicy.c parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/dccp/qpolicy.c')