/* * INET An implementation of the TCP/IP protocol suite for the LINUX * operating system. INET is implemented using the BSD Socket * interface as the means of communication with the user level. * * Checksumming functions for IP, TCP, UDP and so on * * Authors: Jorge Cwik, * Arnt Gulbrandsen, * Borrows very liberally from tcp.c and ip.c, see those * files for more names. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #ifndef _CHECKSUM_H #define _CHECKSUM_H #include #include #include #include #include #ifndef _HAVE_ARCH_COPY_AND_CSUM_FROM_USER static inline __wsum csum_and_copy_from_user (const void __user *src, void *dst, int len, __wsum sum, int *err_ptr) { if (access_ok(VERIFY_READ, src, len)) return csum_partial_copy_from_user(src, dst, len, sum, err_ptr); if (len) *err_ptr = -EFAULT; return sum; } #endif #ifndef HAVE_CSUM_COPY_USER static __inline__ __wsum csum_and_copy_to_user (const void *src, void __user *dst, int len, __wsum sum, int *err_ptr) { sum = csum_partial(src, len, sum); if (access_ok(VERIFY_WRITE, dst, len)) { if (copy_to_user(dst, src, len) == 0) return sum; } if (len) *err_ptr = -EFAULT; return (__force __wsum)-1; /* invalid checksum */ } #endif #ifndef HAVE_ARCH_CSUM_ADD static inline __wsum csum_add(__wsum csum, __wsum addend) { u32 res = (__force u32)csum; res += (__force u32)addend; return (__force __wsum)(res + (res < (__force u32)addend)); } #endif static inline __wsum csum_sub(__wsum csum, __wsum addend) { return csum_add(csum, ~addend); } static inline __sum16 csum16_add(__sum16 csum, __be16 addend) { u16 res = (__force u16)csum; res += (__force u16)addend; return (__force __sum16)(res + (res < (__force u16)addend)); } static inline __sum16 csum16_sub(__sum16 csum, __be16 addend) { return csum16_add(csum, ~addend); } static inline __wsum csum_block_add(__wsum csum, __wsum csum2, int offset) { u32 sum = (__force u32)csum2; /* rotate sum to align it with a 16b boundary */ if (offset & 1) sum = ror32(sum, 8); return csum_add(csum, (__force __wsum)sum); } static inline __wsum csum_block_add_ext(__wsum csum, __wsum csum2, int offset, int len) { return csum_block_add(csum, csum2, offset); } static inline __wsum csum_block_sub(__wsum csum, __wsum csum2, int offset) { return csum_block_add(csum, ~csum2, offset); } static inline __wsum csum_unfold(__sum16 n) { return (__force __wsum)n; } static inline __wsum csum_partial_ext(const void *buff, int len, __wsum sum) { return csum_partial(buff, len, sum); } #define CSUM_MANGLED_0 ((__force __sum16)0xffff) static inline void csum_replace_by_diff(__sum16 *sum, __wsum diff) { *sum = csum_fold(csum_add(diff, ~csum_unfold(*sum))); } static inline void csum_replace4(__sum16 *sum, __be32 from, __be32 to) { __wsum tmp = csum_sub(~csum_unfold(*sum), (__force __wsum)from); *sum = csum_fold(csum_add(tmp, (__force __wsum)to)); } /* Implements RFC 1624 (Incremental Internet Checksum) * 3. Discussion states : * HC' = ~(~HC + ~m + m') * m : old value of a 16bit field * m' : new value of a 16bit field */ static inline void csum_replace2(__sum16 *sum, __be16 old, __be16 new) { *sum = ~csum16_add(csum16_sub(~(*sum), old), new); } struct sk_buff; void inet_proto_csum_replace4(__sum16 *sum, struct sk_buff *skb, __be32 from, __be32 to, bool pseudohdr); void inet_proto_csum_replace16(__sum16 *sum, struct sk_buff *skb, const __be32 *from, const __be32 *to, bool pseudohdr); void inet_proto_csum_replace_by_diff(__sum16 *sum, struct sk_buff *skb, __wsum diff, bool pseudohdr); static inline void inet_proto_csum_replace2(__sum16 *sum, struct sk_buff *skb, __be16 from, __be16 to, bool pseudohdr) { inet_proto_csum_replace4(sum, skb, (__force __be32)from, (__force __be32)to, pseudohdr); } static inline __wsum remcsum_adjust(void *ptr, __wsum csum, int start, int offset) { __sum16 *psum = (__sum16 *)(ptr + offset); __wsum delta; /* Subtract out checksum up to start */ csum = csum_sub(csum, csum_partial(ptr, start, 0)); /* Set derived checksum in packet */ delta = csum_sub((__force __wsum)csum_fold(csum), (__force __wsum)*psum); *psum = csum_fold(csum); return delta; } static inline void remcsum_unadjust(__sum16 *psum, __wsum delta) { *psum = csum_fold(csum_sub(delta, (__force __wsum)*psum)); } #endif ut type='submit' value='reload'/>
authorDavid S. Miller <davem@davemloft.net>2017-02-10 13:18:34 -0500
committerDavid S. Miller <davem@davemloft.net>2017-02-10 13:18:34 -0500
commitb668b9030c0168cf86e054adfe72e89df49b2772 (patch)
tree5475357c2342327746b5f99a67d46f4eb4ef78d3 /include/net/tc_act
parent58be2427da98a17426cff3d30c50e419781a230b (diff)
parent853a14ba4682f820266469979c9297debc05f60c (diff)
Merge branch 'act_pedit-relative-offset'
Amir Vadai says: ==================== net/sched: act_pedit: Use offset relative to conventional network headers Some FW/HW parser APIs are such that they need to get the specific header type (e.g IPV4 or IPV6, TCP or UDP) and not only the networking level (e.g network or transport). Enhancing the UAPI to allow for specifying that, would allow the same flows to be set into both SW and HW. This patchset also makes pedit more robust. Currently fields offset is specified by offset relative to the ip header, while using negative offsets for MAC layer fields. This series enables the user to set offset relative to the relevant header. Usage example: $ tc filter add dev enp0s9 protocol ip parent ffff: \ flower \ ip_proto tcp \ dst_port 80 \ action \ pedit munge ip ttl add 0xff \ pedit munge tcp dport set 8080 \ pipe action mirred egress redirect dev veth0 Will forward traffic destined to tcp dport 80, while modifying the destination port to 8080, and decreasing the ttl by one. I've uploaded a draft for the userspace [2] to make it easier to review and test the patchset. [1] - http://patchwork.ozlabs.org/patch/700909/ [2] - git: https://bitbucket.org/av42/iproute2.git branch: pedit Patchset was tested and applied on top of upstream commit bd092ad1463c ("Merge branch 'remove-__napi_complete_done'") Thanks, Amir Changes since V2: - Instead of reusing unused bits in existing uapi fields, using new netlink attributes for the new information. This way new/old user space and new/old kernel can live together without having misunderstandings. Changes since V1: - No changes - V1 was sent and didn't make it for 4.10. - You asked me [1] why did I use specific header names instead of layers (L2, L3...), and I explained that it is on purpose, this extra information is planned to be used by hardware drivers to offload the action. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/tc_act')
-rw-r--r--include/net/tc_act/tc_pedit.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/net/tc_act/tc_pedit.h b/include/net/tc_act/tc_pedit.h